阅读说明：本技术 用于机制制品的聚乙烯醇纤维复合改性材料的制备方法 (Preparation method of polyvinyl alcohol fiber composite modified material for machine-made products ) 是由 崔跃飞 丘文洁 崔若曦 于 2019-11-13 设计创作，主要内容包括：本发明公开了用于机制制品的聚乙烯醇纤维复合改性材料的制备方法。该方法通过在无纺布制备过程使用上胶改性液(剂)与湿法纺丝生产的聚乙烯醇纤维进行上胶复合而制备,适用的加工工艺包括热轧法无纺布制备工艺,针刺法无纺布制备工艺,水刺法无纺布制备工艺,湿法(造纸法)无纺布制备工艺,干法(气流铺网法)无纺布制备工艺。上胶改性液(剂),按重量份数计,包括如下组分：聚乙烯醇 100；复合增塑剂 20-100；低温增韧剂 3-8；填料1-5；湿润渗透剂0.2-1.0；防霉剂0.3-1.0；水350-550。经以上工艺制备的的无纺布能改善其热封性能和强化机械物理性能,使其手感也得到改善。(The invention discloses a preparation method of a polyvinyl alcohol fiber composite modified material for a machine-made product. The method is prepared by gluing and compounding a gluing modifying solution (agent) and polyvinyl alcohol fibers produced by wet spinning in the preparation process of the non-woven fabric, and the applicable processing technology comprises a hot-rolling non-woven fabric preparation technology, a needle-punching non-woven fabric preparation technology, a spunlace non-woven fabric preparation technology, a wet (paper-making) non-woven fabric preparation technology and a dry (air-laid) non-woven fabric preparation technology. The sizing modifying liquid (agent) comprises the following components in parts by weight: 100 parts of polyvinyl alcohol; 20-100 parts of composite plasticizer; 3-8 parts of a low-temperature toughening agent; 1-5 parts of filler; 0.2-1.0 of wetting penetrant; 0.3-1.0 of mildew preventive; water 350-. The non-woven fabric prepared by the process can improve the heat sealing performance and strengthen the mechanical and physical properties, so that the hand feeling is also improved.)

1. A preparation method of a polyvinyl alcohol fiber composite modified material for a machine-made product is characterized by comprising the following steps: in the preparation process of the non-woven fabric, sizing modification liquid and polyvinyl alcohol fiber produced by wet spinning are used for sizing composite treatment to obtain the polyvinyl alcohol fiber composite modification material for the machine-made product; the components of the sizing modification liquid comprise polyvinyl alcohol, a composite plasticizer, a low-temperature toughening agent, a filler, a penetrating agent, a mildew preventive and water.

2. The method of claim 1, wherein the nonwoven fabric is prepared by one of a hot-rolled nonwoven fabric preparation process, a needle-punched nonwoven fabric preparation process, a spunlaced nonwoven fabric preparation process, a wet nonwoven fabric preparation process, and a dry nonwoven fabric preparation process.

3. The method for preparing the polyvinyl alcohol fiber composite modified material for the mechanical product according to claim 2, wherein when the method for preparing the non-woven fabric is a hot-rolled non-woven fabric preparation process, the method for preparing the polyvinyl alcohol fiber composite modified material for the mechanical product comprises the following steps: opening, carding and mechanically lapping polyvinyl alcohol fiber raw materials, then feeding the polyvinyl alcohol fiber raw materials into a pre-wetting area, treating the polyvinyl alcohol fiber raw materials in the pre-wetting area, then feeding the polyvinyl alcohol fiber raw materials into a low-temperature drying area for surface drying, feeding the polyvinyl alcohol fiber raw materials into a hot rolling drying and reinforcing area, and carrying out hot pressing and shaping and embossing by a shaping roller; the polyvinyl alcohol fiber composite modified material for the machine-made product is obtained by cooling, flattening and rolling the cooling roller, and the gluing composite treatment can be carried out in any procedure before shaping.

4. The method for preparing the polyvinyl alcohol fiber composite modified material for the mechanical product according to claim 2, wherein when the method for preparing the non-woven fabric is a needle-punched non-woven fabric preparation process, the method for preparing the polyvinyl alcohol fiber composite modified material for the mechanical product comprises the following steps: the polyvinyl alcohol fiber raw material enters pre-needling after opening, carding, mechanical or airflow lapping, the main needling is finished into cloth, and then the cloth is sent into a shaping area for shaping treatment and enters calendaring; cooling, shaping, flattening and rolling by a cooling roller to obtain the polyvinyl alcohol fiber composite modified material for the machine-made product; the sizing composite treatment can be carried out in any procedure before shaping.

5. The method for preparing the polyvinyl alcohol fiber composite modified material for the mechanical product according to claim 2, wherein when the preparation method of the non-woven fabric is a spunlace non-woven fabric preparation process, the preparation method of the polyvinyl alcohol fiber composite modified material for the mechanical product comprises the following steps: the polyvinyl alcohol fiber raw material enters water-jet entangling to form cloth after opening, carding, mechanical or airflow lapping, and then is subjected to squeezing dehydration, drying, press polishing and shaping treatment, cooling and shaping by a cooling roller, flattening and rolling to obtain the polyvinyl alcohol fiber composite modified material for the machine-made product; the sizing composite treatment can be carried out in any procedure before shaping.

6. The method for preparing the polyvinyl alcohol fiber composite modified material for the mechanical product according to claim 2, wherein when the method for preparing the non-woven fabric is a wet non-woven fabric preparation process, the method for preparing the polyvinyl alcohol fiber composite modified material for the mechanical product comprises the following steps: opening a polyvinyl alcohol fiber raw material, and then feeding the opened polyvinyl alcohol fiber raw material into a pulping machine for mechanical pulping to prepare polyvinyl alcohol fiber slurry; conveying the ground slurry into a slurry storage tank for later use; then feeding, net feeding, forming, squeezing, drying, finishing and rolling to obtain the polyvinyl alcohol fiber composite modified material for the machine-made product; the sizing composition treatment may be performed in any step before the forming.

7. The method for preparing the polyvinyl alcohol fiber composite modified material for the mechanical product according to claim 2, wherein when the method for preparing the non-woven fabric is a dry non-woven fabric preparation process, the method for preparing the polyvinyl alcohol fiber composite modified material for the mechanical product comprises the following steps: after opening, carding and combing the polyvinyl alcohol fiber raw material, carrying out air flow conveying and air flow lapping, forming, finishing and shaping, and rolling to obtain a finished polyvinyl alcohol non-woven fabric product for a machine-made product; the sizing composite treatment can be carried out in any procedure before shaping.

8. The method for preparing the polyvinyl alcohol fiber composite modified material for the mechanical product according to any one of claims 3 to 5, wherein the dry weight of the sizing modification liquid is 5 to 100wt% of the dry weight of the polyvinyl alcohol fiber raw material; the polyvinyl alcohol fiber raw material is as follows; 0.5-3.0 denier, 2-78 mm.

9. The method for preparing the polyvinyl alcohol fiber composite modified material for the mechanical product according to the claim 6 or 7, characterized in that the dry weight of the sizing modification liquid is 5-100wt% of the dry weight of the polyvinyl alcohol fiber raw material; the polyvinyl alcohol fiber comprises the following raw materials: 0.5-3.0 denier, 0.5-8 mm.

10. The method for preparing the polyvinyl alcohol fiber composite modified material for the mechanical product according to claim 1, wherein the preparation of the sizing modification solution comprises the following steps: mixing polyvinyl alcohol, a composite plasticizer, a low-temperature toughening agent, a filler, a penetrating agent, a mildew preventive and water, heating while stirring, cooling, homogenizing, and cooling to room temperature to obtain the sizing modification liquid.

11. The method for preparing the polyvinyl alcohol fiber composite modified material for the mechanical product according to claim 10, wherein the sizing modification liquid comprises the following components in parts by weight:

100 parts of polyvinyl alcohol;

20-100 parts of a composite plasticizer;

3-8 parts of a low-temperature toughening agent;

1-5 parts of a filler;

0.2-1.0 part of penetrant;

0.3-1.0 part of mildew preventive;

350 portions and 550 portions of water.

12. The method for preparing the polyvinyl alcohol fiber composite modified material for the mechanical product according to claim 10, wherein the alcoholysis degree of the polyvinyl alcohol is 85% -99%; the polymerization degree of the polyvinyl alcohol is 300-2600; the polyvinyl alcohol is more than one of PVA-0385, PVA-0585, PVA-1085, PVA-1385, PVA-1585, PVA-1785, PVA-2085, PVA-2285, PVA-2485, PVA-0395, PVA-0595, PVA-1095, PVA-1395, PVA-1595, PVA-1795, PVA-2095, PVA-2295, PVA-2495, PVA-2695, PVA-0388, PVA-0588, PVA-1088, PVA-1388, PVA-1588, PVA-1788, PVA-2088, PVA-2288, PVA-2488, PVA-0399, PVA-10999, PVA-059, PVA-1399, PVA-1599, PVA-1799, PVA-2099, PVA-2299 and PVA-2499.

13. The method for preparing the polyvinyl alcohol fiber composite modified material for the mechanical products according to claim 10, wherein the composite plasticizer is prepared by uniformly mixing and compounding a main plasticizer and an auxiliary plasticizer, and the mass ratio of the main plasticizer to the auxiliary plasticizer is 100: 5-20 parts of; the primary plasticizer is water-soluble polyhydric alcohol; the water-soluble polyhydric alcohol is an alcohol containing two or more hydroxyl groups in the molecule, and the general formula of the water-soluble polyhydric alcohol is C_nH_2n+2-x(OH)_xX is not less than 3; the water-soluble polyhydric alcohol comprises more than one of glycerol, propylene glycol, ethylene glycol, pentaerythritol, polyethylene glycol, polypropylene glycol, trimethylolethane, xylitol and sorbitol; the auxiliary plasticizer is a polyol derivative modified by carboxyl, and the auxiliary plasticizer is an anionic derivative obtained by modifying polyether polyol with the molecular weight of 800-3000 by carboxyl; the auxiliary plasticizer is K-203PE, K-205PE, K-208PE, K-212PE, Na-203PE and N produced by Ressen New Material science and technology Limited company in Guangzhoua-205PE, Na-208PE, Na-212 PE.

14. The method for preparing the polyvinyl alcohol fiber composite modified material for the mechanical product as claimed in claim 10, wherein the low temperature flexibilizer is ethylene oxide/propylene oxide co-polyether; the molecular weight of the low-temperature flexibilizer is 3000-20000; the low-temperature flexibilizer is one of EPEB-30E, EPOB-50E, EPOB-80E, EPOB-15F, EPOB-20F produced by Guangzhou Litte New materials science and technology Limited company; the filler is inorganic powder with stable inertia, and the mesh number of the filler is more than or equal to 5000 meshes; the filler is one of clay, kaolin, diatomite, calcium silicate powder, talcum powder, alumina, zinc oxide, white carbon black, barium sulfate, light calcium carbonate and heavy calcium carbonate.

15. The method for preparing the polyvinyl alcohol fiber composite modified material for the mechanical product as claimed in claim 10, wherein the penetrating agent is a low-foaming wetting penetrating agent, and the penetrating agent is a surfactant capable of reducing the surface energy of the solid material and making the solid material easily soaked and penetrated by the sizing modifying liquid; the penetrating agent is one of EASYTECH ST-5000, EASYTECH ST-5020, EASYTECH ST-5100, EASYTECHST-5030, EASYTECH ST-5040 and EASYTECH ST-5060 produced by Shanghai Morus Linnaeus chemical industry Co.Ltd; the mildew preventive is one of calcium propionate, sodium sorbate, potassium sorbate, sodium benzoate and dimethyl fumarate.

16. The method for preparing polyvinyl alcohol fiber composite modified material for mechanical products as claimed in claim 10, wherein the stirring speed under the stirring state is 60-200 rpm; the temperature of the heating treatment is 95-100 ℃, and the time of the heating treatment is 2-4 hours; the temperature of the homogenization treatment is 90 ℃, and the time of the heat preservation homogenization treatment is 0.5-1.0 hour.

17. The polyvinyl alcohol fiber composite modified material for mechanical products according to claim 1The gram weight GSM of the polyvinyl alcohol fiber composite modified material for the machine-made product is 12 to 100 grams/m²。

18. A size modifying solution for use in the method of any one of claims 1 to 17.

Technical Field

The invention relates to the field of fiber composite material preparation, in particular to a preparation method of a polyvinyl alcohol fiber composite modified material for a machine-made product.

Background

Polyvinyl alcohol (PVA) has been rapidly developed and applied in many fields in recent years as an environment-friendly material. Polyvinyl alcohol (PVA) material has rich material source and mature production process, especially in the field of fiber production and application, vinylon fiber produced with PVA as main material is produced through wet spinning, water solution spinning, and the preparation of non-woven polyvinyl alcohol fabric is that in the former stage of vinylon fiber production, PVA fiber formed with PVA through wet spinning and coagulating bath is used directly in producing non-woven polyvinyl alcohol fabric without further acetalization. Since the polyvinyl alcohol nonwoven fabric has water-soluble and environment-friendly properties, it is beginning to replace nonwoven fabrics made of plastic synthetic resin as raw material in many fields, such as shoemaking, leather making, mattresses, quilts, decoration, chemical industry, printing, automobiles, building materials, furniture and other industries, as well as clothing linings, medical and sanitary disposable operating gowns, masks, hats, bed sheets, hotel disposable tablecloths, beauty treatment, saunas and even present fashionable gift bags, top-quality bags, shopping bags, advertisement bags and the like. Especially, the disposable application field can completely replace the traditional plastic synthetic resin non-woven fabric, so that the product has more environmental protection.

It can be known from the preparation technology and process of polyvinyl alcohol fiber that the polyvinyl alcohol solution is spun by wet method, the obtained nascent fiber is solidified in alkaline coagulating bath, and is formed into fiber after neutralization, water washing, multi-stage high-power drawing and heat treatment, and the polyvinyl alcohol fiber with excellent mechanical property is obtained, not only the strength is high, the modulus is high, but also the dispersibility of the fiber is very good. The fiber can be used for producing polyvinyl alcohol non-woven fabrics with various specifications.

As is well known, the melting point of the polyvinyl alcohol is as high as 220-230 ℃, and under the heating condition, the polyvinyl alcohol begins to generate instability and decomposition at 180 ℃, and the decomposition is accelerated along with the continuous rise of the temperature, and the crosslinking is generated; therefore, pure polyvinyl alcohol generally has no thermoplastic processing property, so that under the current conditions, pure polyvinyl alcohol materials cannot realize Melt spinning (Melt spinning) through the thermoplastic property thereof like general thermoplastics such as polypropylene (PP), Polyethylene (PE), Polyester (PET), nylon (PA), and the like: namely Melt extrusion spinning (Melt extruded spinning), Melt blowing spinning (Melt spun spinning), Melt spun bonding (Melt spun bonding) and the like to prepare polyvinyl alcohol fibers and nonwoven fabrics; that is, the polyvinyl alcohol fiber spun by the wet method (solution spinning) does not have thermoplasticity, so the polyvinyl alcohol nonwoven fabric produced by the polyvinyl alcohol fiber spun by the wet method does not have thermoplasticity heat sealing property at all; this is one of the biggest defects of the polyvinyl alcohol fiber and the nonwoven fabric, i.e. the nonwoven fabric prepared from the other common thermoplastic synthetic resins can not have excellent heat sealing performance, so that the application fields of the nonwoven fabric are limited, such as the later product processing of the nonwoven fabric: edge sealing, bag making, etc. can only be achieved by traditional manual sewing and not by the process of an automatic heat-sealing bag making processing machine. This results in inefficient machining and a dramatic increase in cost.

In order to solve the defect that the polyvinyl alcohol nonwoven fabric does not have thermoplasticity, in recent years, the polyvinyl alcohol nonwoven fabric is subjected to post-processing modification treatment after being formed to obtain thermoplasticity, so that the polyvinyl alcohol nonwoven fabric can be suitable for edge sealing, bag making and other performances by methods such as heat sealing, ultrasonic welding and the like, for example, patents CN108221386A, CN109295726A, CN109371681A and the like are used for obtaining thermoplasticity by secondary processing modification, namely, post-padding finishing of the polyvinyl alcohol nonwoven fabric; the patent CN108729246A also obtains the heat sealing performance of the polyvinyl alcohol nonwoven fabric by performing a second processing on the formed polyvinyl alcohol nonwoven fabric, namely by coating and compounding. However, the above methods all require secondary processing modification, and modified polyvinyl alcohol fiber composites with thermoplastic and heat-sealing properties cannot be directly obtained.

Disclosure of Invention

The invention aims to provide a sizing modification treatment method of polyvinyl alcohol fibers in the production process of non-woven fabrics aiming at the defects of the existing materials and technologies. The polyvinyl alcohol fiber used in the present invention means a fiber produced by a wet spinning (solution spinning) method. The same applies below. This material had no thermoplastic and heat-sealable properties until the present technology was applied. Such polyvinyl alcohol fiber composite materials are collectively called polyvinyl alcohol nonwoven fabric materials (hereinafter the same) when they come in the form of products.

The invention modifies the polyvinyl alcohol non-woven fabric in the production process through a feasible technical scheme to obtain the same thermoplastic and heat sealing performances at one time, so that the produced non-woven fabric has the technical requirements and performances, and the polyvinyl alcohol non-woven fabric does not need to be modified for the second time.

The purpose of the invention is realized by at least one of the following technical solutions.

The invention provides a preparation method of a polyvinyl alcohol fiber composite modified material (non-woven fabric) for a machine-made product, which comprises the following steps: in the preparation process of the non-woven fabric, sizing modification liquid (agent) and polyvinyl alcohol fiber raw materials are used for sizing composite treatment, and the polyvinyl alcohol fiber composite modified material (non-woven fabric) for the machine-made product is obtained.

Aiming at the defects of the existing polyvinyl alcohol non-woven fabric, the polyvinyl alcohol fiber is glued in the production process of the non-woven fabric, so that the heat-sealable performance of the polyvinyl alcohol non-woven fabric can be realized on the processes of an automatic heat sealing processing machine like the traditional thermoplastic synthetic resin non-woven fabric, and the processing of products such as edge sealing, bag making and the like of heat sealing or ultrasonic welding sealing can be realized, thereby greatly improving the processing efficiency and reducing the cost.

When the polyvinyl alcohol fiber composite material provided by the invention appears in a product form, the composite material is collectively called as a polyvinyl alcohol non-woven fabric material; the non-woven fabric (polyvinyl alcohol fiber composite modified material for machine-made products) prepared by the invention is suitable for automatic mechanical manufacturing of various products such as heat sealing, ultrasonic welding sealing, edge sealing, bag making and the like.

Further, the method for preparing the non-woven fabric comprises one of a hot-rolled non-woven fabric preparation process (shown in fig. 1), a needle-punched non-woven fabric preparation process (shown in fig. 2), a spunlaced non-woven fabric preparation process (shown in fig. 3), a wet non-woven fabric preparation process (i.e., a papermaking non-woven fabric preparation process (shown in fig. 4)) and a dry non-woven fabric preparation process (i.e., an air-laid method (shown in fig. 5)).

The preparation method of the polyvinyl alcohol fiber composite modified material for the machine-made product provided by the invention can be carried out in the forming process of the 5 non-woven fabric preparation processes when the polyvinyl alcohol fiber raw material is subjected to gluing composite modification treatment, and comprises the steps of pre-gluing modification treatment of the polyvinyl alcohol fiber at the early stage and gluing modification treatment in any process section before the setting process in the non-woven fabric preparation process.

Further, when the preparation method of the non-woven fabric is a hot-rolling non-woven fabric preparation process (as shown in fig. 1), the preparation method of the polyvinyl alcohol fiber composite modified material for the machine-made product comprises the following steps: opening, carding and mechanically lapping polyvinyl alcohol fiber raw materials, then feeding the polyvinyl alcohol fiber raw materials into a pre-wetting area, treating the polyvinyl alcohol fiber raw materials in the pre-wetting area, then feeding the polyvinyl alcohol fiber raw materials into a low-temperature drying area for surface drying, feeding the polyvinyl alcohol fiber raw materials into a hot rolling drying and reinforcing area, and carrying out hot pressing and shaping and embossing by a shaping roller; the polyvinyl alcohol fiber composite modified material for the machine-made product is obtained by cooling, flattening and rolling the cooling roller, and the gluing composite treatment can be carried out in any process combination before shaping.

Further, when the preparation method of the non-woven fabric is a needle-punched non-woven fabric preparation process (as shown in fig. 2), the preparation method of the polyvinyl alcohol fiber composite modified material for the machine-made product comprises the following steps: the polyvinyl alcohol fiber raw material is subjected to opening, carding, mechanical or airflow lapping, then enters pre-needling, is subjected to main needling to form cloth, then is sent to a shaping area for shaping treatment, and enters calendaring; cooling, shaping, flattening and rolling by a cooling roller to obtain the polyvinyl alcohol fiber composite modified material for the machine-made product; the sizing composite treatment can be carried out by any process combination before shaping.

Further, when the preparation method of the non-woven fabric is a spunlace non-woven fabric preparation process (as shown in fig. 3), the preparation method of the polyvinyl alcohol fiber composite modified material for the machine-made product comprises the following steps: the polyvinyl alcohol fiber raw material enters into spunlace to be cloth after opening, carding, mechanical or airflow lapping, and then is subjected to squeezing dehydration, drying, press polishing (optional) and shaping treatment, cooling and shaping by a cooling roller, flattening and rolling to obtain the polyvinyl alcohol fiber composite modified material for the machine-made product; the sizing composite treatment can be carried out in any procedure before shaping.

Further, when the preparation method of the non-woven fabric is a wet non-woven fabric preparation process (as shown in fig. 4), the preparation method of the polyvinyl alcohol fiber composite modified material for the machine-made product comprises the following steps: opening a polyvinyl alcohol fiber raw material, and then feeding the opened polyvinyl alcohol fiber raw material into a pulping machine for mechanical pulping to prepare polyvinyl alcohol fiber slurry; conveying the ground slurry into a slurry storage tank for later use; then feeding, net feeding, forming, squeezing, drying, finishing and rolling to obtain the polyvinyl alcohol fiber composite modified material for the machine-made product; the sizing composition treatment may be performed in any step before the forming.

Further, when the preparation method of the non-woven fabric is a dry non-woven fabric preparation process (as shown in fig. 5), the preparation method of the polyvinyl alcohol fiber composite modified material for the machine-made product comprises the following steps: after opening, carding and combing the polyvinyl alcohol fiber raw material, carrying out air flow conveying and air flow lapping, forming, finishing and shaping, and rolling to obtain a finished polyvinyl alcohol non-woven fabric product for a machine-made product; the sizing composite treatment can be carried out in any procedure before shaping.

Further, when the preparation method of the non-woven fabric is a spunlace non-woven fabric preparation process, a needle-punching non-woven fabric preparation process or a hot-rolling non-woven fabric preparation process, the dry weight of the sizing modification liquid is 5-100wt% of the dry weight of the polyvinyl alcohol fiber raw material; the polyvinyl alcohol fiber raw material is short fiber produced by wet spinning with the thickness of 0.5-3.0 denier and the thickness of 2-78 mm.

Further, when the preparation method of the non-woven fabric is a dry non-woven fabric preparation process or a wet non-woven fabric preparation process, the dry weight of the sizing modification liquid is 5-100wt% of the dry weight of the polyvinyl alcohol fiber raw material; the polyvinyl alcohol fiber raw material is short fiber produced by wet spinning with the denier of 0.5-3.0 and the diameter of 0.5-8 mm.

Furthermore, the sizing modification liquid is prepared by compounding and modifying polyvinyl alcohol serving as a main raw material; the preparation of the sizing modification liquid comprises the following steps: mixing polyvinyl alcohol, a composite plasticizer, a low-temperature toughening agent, a filler, a penetrating agent, a mildew preventive and water, heating while stirring, cooling, homogenizing, and cooling to room temperature to obtain the sizing modification liquid.

Further, the sizing modification liquid comprises the following components in parts by weight:

further, the alcoholysis degree of the polyvinyl alcohol is 85% -99%; the polymerization degree of the polyvinyl alcohol is 300-2600; the polyvinyl alcohol is one or more of PVA-0385, PVA-0585, PVA-1085, PVA-1385, PVA-1585, PVA-1785, PVA-2085, PVA-2285, PVA-2485, PVA-0395, PVA-0595, PVA-1095, PVA-1395, PVA-1595, PVA-1795, PVA-2095, PVA-2295, PVA-2495, PVA-2695, PVA-0388, PVA-0588, PVA-1088, PVA-1388, PVA-1588, PVA-1788, PVA-2088, PVA-2288, PVA-2488, PVA-0399, PVA-10999, PVA-059, PVA-1399, PVA-1599, PVA-1799, PVA-2099, PVA-2299 and PVA-2499.

Further, the compoundThe synthetic plasticizer is prepared by uniformly mixing a main plasticizer and an auxiliary plasticizer and compounding, wherein the mass ratio of the main plasticizer to the auxiliary plasticizer is 100: 5-20 parts of; the primary plasticizer is water-soluble polyhydric alcohol; the water-soluble polyhydric alcohol is an alcohol containing two or more hydroxyl groups in the molecule, and the general formula of the water-soluble polyhydric alcohol is C_nH_2n+2-x(OH)_xX is not less than 3; the water-soluble polyhydric alcohol comprises more than one of glycerol, propylene glycol, ethylene glycol, pentaerythritol, polyethylene glycol, polypropylene glycol, trimethylolethane, xylitol and sorbitol; the auxiliary plasticizer (plasticizer) is a polyol derivative modified by carboxyl, and the auxiliary plasticizer is an anionic derivative obtained by modifying polyether polyol with the molecular weight of 800-3000 by carboxyl; the auxiliary plasticizer is one of K-203PE, K-205PE, K-208PE, K-212PE, Na-203PE, Na-205PE, Na-208PE, Na-212PE and the like produced by Ressen New Material science and technology Limited in Guangzhou.

Further, the low-temperature toughening agent is ethylene oxide/propylene oxide copolymer polyether; the molecular weight of the low-temperature flexibilizer is 3000-20000; the low-temperature flexibilizer is one of EPEB-30E, EPOB-50E, EPOB-80E, EPOB-15F, EPOB-20F and the like produced by Guangzhou Litte New materials science and technology Limited company; the filler is inorganic powder with stable inertia, and the mesh number of the filler is more than or equal to 5000 meshes; the filler is one of clay, kaolin, diatomite, calcium silicate powder, talcum powder, alumina, zinc oxide, white carbon black, barium sulfate, light calcium carbonate, heavy calcium carbonate and the like.

Further, the penetrating agent is a low-foaming wetting penetrating agent, and the penetrating agent is a surfactant capable of reducing the surface energy of the solid material and enabling the solid material to be easily soaked and penetrated by the sizing modification liquid; the penetrating agent is one of EASYTECH ST-5000, EASYTECH ST-5020, EASYTECH ST-5100, EASYTECHST-5030, EASYTECH ST-5040 and EASYTECH ST-5060 produced by Shanghai Morus Linnaeus chemical industry Co.Ltd; the mildew preventive is one of calcium propionate, sodium sorbate, potassium sorbate, sodium benzoate and dimethyl fumarate. The penetrant can improve the performance uniformity of the polyvinyl alcohol fiber composite modified material for the mechanical product in the preparation process.

Preferably, the water is industrial deionized purified water.

Further, the stirring speed under the stirring state is 60-200 r/min; the temperature of the heating treatment is 95-100 ℃, and the time of the heating treatment is 2-4 hours; the temperature of the homogenization treatment is 90 ℃, and the time of the heat preservation homogenization treatment is 0.5-1.0 hour.

The gram weight GSM of the polyvinyl alcohol fiber composite modified material for the machine-made products provided by the invention is 12-100 g/m². When the polyvinyl alcohol fiber composite material appears in a product form, the polyvinyl alcohol fiber composite material is generally called polyvinyl alcohol nonwoven fabric material (the same below); the polyvinyl alcohol fiber non-woven fabric prepared by the invention is suitable for automatic mechanical manufacturing of various products such as ultrasonic welding sealing, edge sealing, bag making and the like.

The preparation method of the polyvinyl alcohol fiber composite modified material for the machine-made product provided by the invention is described in detail as follows.

The sizing modification treatment method of the polyvinyl alcohol fiber for the machine-made product is suitable for the following production process and method.

Suitable production process and method

1. Hot rolling method non-woven fabric preparation process and method

The process flow of the hot rolling method for preparing the non-woven fabric is shown in figure 1, and comprises the following steps:

the polyvinyl alcohol fiber raw material enters a pre-wetting area after opening, carding and mechanical lapping, is treated in the pre-wetting area, then is sent to a low-temperature drying area for surface drying, enters hot rolling, drying and reinforcing, and is subjected to hot pressing and shaping by a shaping roller and embossing; cooling by a cooling roller, flattening and rolling to obtain the finished product of the modified polyvinyl alcohol non-woven fabric prepared by the invention.

The sizing modification treatment method used in the invention is implemented as follows: the method can be carried out in any process of the preparation of the non-woven fabric, and comprises the steps of pre-sizing modification treatment of the polyvinyl alcohol fiber in the early stage and sizing modification treatment in any process section before the setting process in the preparation of the non-woven fabric.

Furthermore, the invention compounds the polyvinyl alcohol fiber and the modifying glue to form the modified polyvinyl alcohol fiber non-woven fabric through the gluing modification treatment in the non-woven fabric preparation process, and the gluing amount (dry weight) in the treatment is 5-100% of the polyvinyl alcohol fiber (dry weight). The polyvinyl alcohol fiber raw material used for the polyvinyl alcohol non-woven fabric used for the machine-made product is short fiber produced by wet spinning with the thickness of 2-78mm and the denier of 0.5-3.

2. Needle-punching method non-woven fabric preparation process and method

The needle punching non-woven fabric preparation process flow is shown in figure 2 and comprises the following steps:

the polyvinyl alcohol fiber raw material enters pre-needling after opening, carding and mechanical (or airflow) lapping, the main needling is carried out to form cloth, and then the cloth is sent into a shaping area for shaping treatment and then enters calendaring; cooling and shaping by a cooling roller, flattening and rolling to obtain the finished product of the modified polyvinyl alcohol non-woven fabric prepared by the invention.

The sizing modification treatment method used by the invention is implemented as follows: the method can be carried out in any process of the preparation of the non-woven fabric, and comprises the steps of pre-sizing modification treatment of the polyvinyl alcohol fiber in the early stage and sizing modification treatment in any process section before the setting process in the preparation of the non-woven fabric.

Furthermore, the invention compounds the polyvinyl alcohol fiber and the modifying glue to form the modified polyvinyl alcohol fiber non-woven fabric through the gluing modification treatment in the non-woven fabric preparation process, and the gluing amount (dry weight) in the treatment is 5-100% of the polyvinyl alcohol fiber (dry weight). The polyvinyl alcohol fiber raw material used for the polyvinyl alcohol non-woven fabric used for the machine-made product is short fiber produced by wet spinning with the thickness of 2-78mm and the denier of 0.5-3.

3. A preparation process and a method of spunlace nonwoven fabric.

The process flow of the spunlace nonwoven fabric is shown in fig. 3, and comprises the following steps:

the polyvinyl alcohol fiber raw material enters water to be made into cloth after opening, carding and mechanical (or airflow) lapping, and then the cloth is dried, sent into press polish (optional) and shaped, cooled and shaped by a cooling roller, flattened and rolled to obtain the finished product of the modified polyvinyl alcohol non-woven fabric prepared by the invention.

The sizing modification treatment method used by the invention is implemented as follows: the method can be carried out in any process of the preparation of the non-woven fabric, and comprises the steps of pre-sizing modification treatment of the polyvinyl alcohol fiber in the early stage and sizing modification treatment in any process section before the setting process in the preparation of the non-woven fabric.

Furthermore, the invention compounds the polyvinyl alcohol fiber and the modifying glue to form the modified polyvinyl alcohol fiber non-woven fabric through the gluing modification treatment in the non-woven fabric preparation process, and the gluing amount (dry weight) in the treatment is 5-100% of the polyvinyl alcohol fiber (dry weight). The polyvinyl alcohol fiber raw material used for the polyvinyl alcohol non-woven fabric used for the machine-made product is short fiber produced by wet spinning with the thickness of 2-78mm and the denier of 0.5-3.

4. The wet (paper-making) non-woven fabric preparing process and method:

the process flow of the wet (papermaking) non-woven fabric preparation process is shown in the following figure 4, and comprises the following steps:

the polyvinyl alcohol fiber raw material enters a pulping machine together with a sizing modifier after being opened to be mechanically ground to prepare polyvinyl alcohol fiber pulp; conveying the ground slurry into a slurry storage tank for later use; then the polyvinyl alcohol non-woven fabric used for the machine-made product is obtained by feeding, net laying, forming, squeezing, drying, finishing and rolling.

The sizing modification treatment used in the invention can also be carried out in any process of the wet (paper-making) non-woven fabric preparation, including pre-sizing modification treatment of polyvinyl alcohol fiber in the early stage and sizing modification treatment in any process section before the forming process in the non-woven fabric preparation process.

Furthermore, the invention compounds the polyvinyl alcohol fiber and the modifying glue to form the modified polyvinyl alcohol fiber non-woven fabric through the gluing modification treatment in the non-woven fabric preparation process, and the gluing amount (dry weight) in the treatment is 5-100% of the polyvinyl alcohol fiber (dry weight). The polyvinyl alcohol fiber raw material used for the polyvinyl alcohol non-woven fabric of the machine-made product is short fiber produced by wet spinning with the thickness of 0.5-3 denier and the thickness of 0.5-8 mm.

5. The technological process of the dry (air-laid) non-woven fabric preparation process is shown in fig. 5, and comprises the following steps:

after opening, carding and combing polyvinyl alcohol fiber raw materials, carrying out air flow conveying and air flow lapping and forming; and then, gluing treatment is carried out by using a gluing modification liquid, wherein the gluing treatment can be carried out by adopting gluing processes such as spraying, coating, dipping, padding and the like, and the non-woven fabric subjected to gluing modification is dried, finished, shaped and rolled to obtain a finished polyvinyl alcohol non-woven fabric product for a machine-made product.

The sizing modification treatment used in the invention can also be carried out in any process of the dry (paper making) non-woven fabric preparation, including pre-sizing modification treatment of polyvinyl alcohol fiber in the early stage and sizing modification treatment in any process section before the drying, finishing and shaping process in the non-woven fabric preparation process.

Furthermore, the invention compounds the polyvinyl alcohol fiber and the modifying glue to form the modified polyvinyl alcohol fiber non-woven fabric through the gluing modification treatment in the non-woven fabric preparation process, and the gluing amount (dry weight) in the treatment is 5-100% of the polyvinyl alcohol fiber (dry weight). The polyvinyl alcohol fiber raw material used in the process is 0.5-3 denier, and the mixed short fiber is produced by wet spinning with the diameter of 0.5-8 mm.

Secondly, a preparation method of sizing modification liquid (agent) of polyvinyl alcohol non-woven fabric for machine-made products:

the sizing modifier (agent) for the polyvinyl alcohol non-woven fabric for machine-made products is prepared by compounding and modifying main raw material polyvinyl alcohol, and comprises main materials of polyvinyl alcohol, a composite plasticizer, a low-temperature flexibilizer, a filler, a penetrating agent, a mildew preventive and water, wherein the main materials of polyvinyl alcohol, the composite plasticizer, the low-temperature flexibilizer, the filler, the penetrating agent, the mildew preventive and the water are mixed (mixed in a dissolving container with a stirring and heating device), the temperature is raised in a stirring state for heating treatment to ensure that the polyvinyl alcohol is completely dissolved, then the polyvinyl alcohol is subjected to heat preservation treatment, cooled to room temperature, and discharged.

Further, the sizing modification liquid (agent) for the polyvinyl alcohol non-woven fabric for the machine-made product comprises the following components in parts by weight:

furthermore, the alcoholysis degree of the polyvinyl alcohol used as the main raw material of the sizing modification liquid (agent) for the polyvinyl alcohol non-woven fabric of the machine-made product is 85-99 percent; the polymerization degree of the polyvinyl alcohol is 300-2600; all water-soluble polyvinyl alcohol types such as one or more of PVA-0385, PVA-0585, PVA-1085, PVA-1385, PVA-1585, PVA-1785, PVA-2085, PVA-2285, PVA-2485, PVA-0395, PVA-0595, PVA-1095, PVA-1395, PVA-1595, PVA-1795, PVA-2095, PVA-2295, PVA-2495, PVA-2695, PVA-0388, PVA-0588, PVA-1088, PVA-1388, PVA-1588, PVA-1788, PVA-2088, PVA-2288, PVA-2488, PVA-0399, PVA-0599, PVA-1099, PVA-1399, PVA-1599, PVA-1799, PVA-2099, PVA-2299, PVA-2499 and the like.

Further, the composite plasticizer for the sizing modification liquid (agent) for the polyvinyl alcohol non-woven fabric for the machine-made product is formed by compounding a main plasticizer and a plasticizer aid, wherein the main plasticizer is water-soluble polyol; the water-soluble polyalcohol is an alcohol with two or more hydroxyl groups in the molecule, and the general formula is CnH2n +2-x (OH) x, wherein x is more than or equal to 3; the water-soluble polyhydric alcohol comprises one or more of glycerol, propylene glycol, ethylene glycol, pentaerythritol, polyethylene glycol, polypropylene glycol, trimethylolethane, xylitol and sorbitol; the main plasticizer has rich sources and low price, but because of the compatibility with polyvinyl alcohol, the main plasticizer cannot be added in a large amount when plasticizing the polyvinyl alcohol material, generally more than 10 percent (calculated by relative to the net weight of the polyvinyl alcohol), the main plasticizer is easy to migrate and separate out in a natural environment, so that the plasticizing effect of the main plasticizer is greatly reduced, the heat sealing performance of the non-woven fabric is directly influenced by the plasticizing effect, and the surface of a product is polluted by the large amount of migration and separation of the plasticizer, so that the service performance of the product is seriously influenced. Experiments prove that in order to realize good and stable heat sealing performance of the polyvinyl alcohol material, the addition amount of the used plasticizer is required to be more than 20 percent (relative to the net weight of the polyvinyl alcohol), in order to solve the problem of effective plasticization of the polyvinyl alcohol, the invention adopts a compounding method of synergistic auxiliary plasticization, so that a large amount of main plasticizer can be added to improve the effective plasticization of polyvinyl alcohol fibers, and the polyvinyl alcohol non-woven fabric effectively plasticized by the invention can realize stable and excellent thermoplastic performance.

Further, the composite plasticizer for the sizing modification liquid (agent) for the polyvinyl alcohol non-woven fabric for the machine-made product is formed by compounding a main plasticizer and a plasticizer aid, wherein the plasticizer aid is a carboxyl modified polyol derivative, is a derivative obtained by modifying polyether polyol with the molecular weight of 800-3000 through carboxyl, and comprises one of K-203PE, K-205PE, K-208PE, K-212PE, Na-203PE, Na-205PE, Na-208PE and Na-212PE which are produced by Ressen New Material science and technology Limited in Guangzhou; wherein K series represents alkali metal potassium introduced after carboxyl modification, and Na series is sodium salt; the carboxyl content is 3-12%. The plasticizer is actually a plasticizer with an anionic surfactant, and an anionic polyether modified derivative with strong polarity can effectively destroy crystals in a polyvinyl alcohol molecular chain, so that a large amount of nonionic polyol plasticizer (main plasticizer) enters the molecular chain to be effectively plasticized, and forms a stable plasticizing system with the main plasticizer without migration and precipitation.

Further, the composite plasticizer for the sizing modification liquid (agent) for the polyvinyl alcohol non-woven fabric for the machine-made product is prepared by compounding a main plasticizer and a plasticizer aid, wherein the compounding ratio of the main plasticizer to the plasticizer aid is calculated by weight parts: primary plasticizer: and (3) the plasticizer-aid agent is 100: 5-20 parts of; the compound system can generate synergistic plasticizing and stable plasticizing effects; thereby effectively realizing effective plasticization modification of the polyvinyl alcohol non-woven fabric and ensuring the realization of thermoplastic performance required in secondary processing.

Furthermore, the low-temperature toughening agent for the sizing modification liquid (agent) for the polyvinyl alcohol non-woven fabric (polyvinyl alcohol fiber composite modification material for the machine-made product) for the machine-made product is modified for ensuring the flexibility of the polyvinyl alcohol non-woven fabric at low temperature, and can also greatly improve the soft and comfortable hand feeling of the polyvinyl alcohol non-woven fabric; comprises one of EPOB-30E, EPOB-50E, EPOB-80E, EPOB-15F, EPOB-20F and the like manufactured by New materials science and technology Limited of Litte, Guangzhou; is prepared from ethanediamine/propylene oxide polyether or ethylene oxide/propylene oxide copolyether; the molecular weight is 3000-20000.

Furthermore, the filler for the sizing modification liquid (agent) for the polyvinyl alcohol non-woven fabric for the machine-made product is inorganic powder with stable inertia, and the mesh number of the inorganic filler is not less than 5000 meshes; the inorganic filler is one of clay, kaolin, diatomite, calcium silicate powder, talcum powder, alumina, zinc oxide, white carbon black, barium sulfate, light calcium carbonate, heavy calcium carbonate and the like. The filler is mainly used for improving the flatness and the stiffness of the surface of the non-woven fabric.

Furthermore, the wetting penetrant for the sizing modifier (agent) for the polyvinyl alcohol non-woven fabric for the machine-made products belongs to a low-foaming wetting penetrant, can reduce the surface energy of solid materials, enables the solid materials to be more easily soaked and permeated by the sizing modifier (agent), can improve the performance uniformity of the preparation process of the modified polyvinyl alcohol non-woven fabric, and comprises one of EASYTECH ST-5000, EASYTECH ST-5020, EASYTECHST-5100, EASYTECHST-5030, EASYTECH ST-5040, EASYTECH ST-5060 and the like produced by Shanghai Sangjing chemical engineering Co., Ltd.

Further, the above-mentioned sizing modifier (agent) for polyvinyl alcohol nonwoven fabric used for machine-made products is one of calcium propionate, sodium sorbate, potassium sorbate, sodium benzoate and dimethyl fumarate.

Furthermore, the water used for the sizing modification liquid (agent) for the polyvinyl alcohol non-woven fabric for the machine-made product is industrial deionized purified water.

Further, the preparation method of the sizing modification liquid (agent) for the polyvinyl alcohol non-woven fabric for the machine-made product comprises the steps of mixing all the materials in a dissolving container with stirring and heating devices; heating and dissolving under stirring to ensure that the polyvinyl alcohol is completely dissolved, then carrying out heat preservation and homogenization treatment, cooling to room temperature, and discharging for later use to obtain the sizing modification liquid (agent) for the polyvinyl alcohol non-woven fabric for the machine-made product.

Further, the preparation method of the sizing modification liquid (agent) for the polyvinyl alcohol non-woven fabric for the machine-made product has the stirring speed of 60-200 r/min under the stirring state; the temperature of the heating treatment is 95-100 ℃, and the time of the heating treatment is 2-4 hours; the temperature of the heat preservation homogenization treatment is 90 ℃, and the time of the heat preservation homogenization treatment is 0.5-1.0 hour.

The invention relates to the application field of polyvinyl alcohol non-woven fabrics (polyvinyl alcohol fiber composite modified materials for machine-made products): the product can cover and replace the fields of industrial and civil products prepared by traditional non-woven fabrics and textile fabrics, including industries such as shoemaking, leather making, mattresses, primary and secondary quilts, decoration, chemical engineering, printing, automobiles, building materials, furniture and the like; such as the clothing lining cloth, medical and sanitary disposable operating clothes, mask, cap, bed sheet, hotel disposable tablecloth, beauty sauna and modern fashionable gift bag, competitive product bag, shopping bag and advertisement bag, etc. which are made of non-woven fabrics and textile fabrics, especially the field of disposable products, various shopping bags, fast-moving products packaging field, takeaway packaging, etc., the polyvinyl alcohol non-woven fabrics can completely cover and replace the application field of the traditional plastic synthetic resin non-woven fabrics and textile fabrics, so that the product has more environmental protection.

Compared with the prior art, the invention has the following advantages and beneficial effects:

(1) the polyvinyl alcohol fiber composite modified material for the machine-made products has excellent heat sealing performance, and the sizing modification liquid provided by the invention enables polyvinyl alcohol fibers to have the heat sealing performance of secondary processing after composite modification, so that the processes of edge sealing, continuous bag making and the like of an automatic machine are favorably realized, the product processing efficiency is greatly improved, and the cost is reduced;

(2) the polyvinyl alcohol fiber composite modified material for the machine-made product has firmer fiber nodes, so that the mechanical property of the polyvinyl alcohol fiber composite modified material is further improved;

(3) the polyvinyl alcohol fiber composite modified material for machine-made products provided by the invention is added with the sizing modification liquid for treatment, so that the breaking elongation of the polyvinyl alcohol non-woven fabric is improved, and the polyvinyl alcohol non-woven fabric is softer and more comfortable and has better hand feeling.

(4) Compared with the polyvinyl alcohol non-woven fabric produced by the traditional process, the polyvinyl alcohol fiber composite modified material for the machine-made products prepared by the invention has the characteristics of more uniformity and more smoothness, and is more suitable for preparing various products by automatic machinery at a high speed.

(5) The water-soluble temperature of the polyvinyl alcohol non-woven fabric compositely modified by the sizing modification liquid is reduced, and the polyvinyl alcohol non-woven fabric can be dissolved in water at the temperature of 80-90 ℃ by the original fiber which needs high-temperature water solubility at the temperature of 95 ℃.

Drawings

FIG. 1 is a process flow chart of the preparation of the polyvinyl alcohol fiber composite modified material for machine-made products by a hot-rolling method non-woven fabric preparation process;

FIG. 2 is a process flow chart of the preparation process of the polyvinyl alcohol fiber composite modified material for the machine-made product by adopting a needle punching non-woven fabric preparation process;

FIG. 3 is a process flow chart of the preparation of the polyvinyl alcohol fiber composite modified material for machine-made products by the spunlace nonwoven fabric preparation process;

FIG. 4 is a process flow chart of the wet nonwoven fabric preparation process for preparing the polyvinyl alcohol fiber composite modified material for the machine-made product;

FIG. 5 is a process flow chart of the dry nonwoven fabric preparation process for preparing the polyvinyl alcohol fiber composite modified material for machine-made products.

Detailed Description

The following examples are presented to further illustrate the practice of the invention, but the practice and protection of the invention is not limited thereto. It is noted that the processes described below, if not specifically described in detail, are all realizable or understandable by those skilled in the art with reference to the prior art. The reagents or apparatus used are not indicated to the manufacturer, and are considered to be conventional products available by commercial purchase.

The weight (mass) parts used in the following examples and comparative examples may be given by way of example in the form of grams, kilograms, etc., or may be any other amount commonly used in the art.

In the following examples, the plasticizer aid used was a carboxyl-modified polyol derivative, which was a carboxyl-modified derivative of a polyether polyol having a molecular weight of 800-3000, and included one of K-203PE, K-205PE, K-208PE, K-212PE, Na-203PE, Na-205PE, Na-208PE, and Na-212PE, which are available from Ressen New Material science and technology, Inc., Guangzhou.

The used wetting penetrating agent belongs to a low-foam type wetting penetrating agent, can reduce the surface energy of solid materials, enables the solid materials (fibers) to be more easily soaked and penetrated by the sizing modifying liquid (agent), and can improve the performance uniformity of the preparation process of the modified polyvinyl alcohol non-woven fabric. Is one of EASYTECH ST-5000, EASYTECH ST-5020, EASYTECH ST-5100, EASYTECHST-5030, EASYTECH ST-5040 and EASYTECH ST-5060 produced by Shanghai Sanguing chemical Co.

The low-temperature flexibilizer is one of EPEB-30E, EPOB-50E, EPOB-80E, EPOB-15F, EPOB-20F produced by Guangzhou Litte New materials science and technology Limited.

The polyvinyl alcohol fiber used means a fiber produced by a wet spinning (solution spinning) method.

The mesh number of the used inorganic filler is more than or equal to 5000 meshes.