阅读说明：本技术 一种防潮防水环保人造革的制备方法及人造革 (Preparation method of damp-proof, waterproof and environment-friendly artificial leather and artificial leather ) 是由 王习文 史梦晴 于 2019-12-05 设计创作，主要内容包括：本发明提供了一种防潮防水环保人造革的制备方法,具体包括：基材的抄造、合成革的制作和合成革的后加工等步骤。本方法采用天丝纤维与黏胶纤维作为原料抄造而成的无纺布作为基材,安全环保,可在自然环境中降解,通过在基材表面喷淋疏水剂,可以增强基材的防水防潮能力,通过采用离型纸法实现人造革的合成,可以使得基材表面均匀覆盖生物基树脂和防水涂饰剂,可以有效增强本人造革的撕裂度和表面防水能力,提高了人造革的使用寿命,通过在人造革表面涂覆功能涂饰剂,可以有效增强本人造革的抗腐蚀和抗紫外老化能力。本发明还提供了一种通过上述方法得到的防潮防水环保人造革。(The invention provides a preparation method of dampproof, waterproof and environment-friendly artificial leather, which specifically comprises the following steps: the method comprises the steps of papermaking of a base material, manufacturing of synthetic leather, post-processing of the synthetic leather and the like. The method adopts the non-woven fabric made of tencel fibers and viscose fibers as raw materials as a base material, is safe and environment-friendly, can be degraded in natural environment, can enhance the waterproof and moistureproof capacity of the base material by spraying a hydrophobic agent on the surface of the base material, can uniformly cover the surface of the base material with bio-based resin and a waterproof coating agent by realizing the synthesis of artificial leather by adopting a release paper method, can effectively enhance the tearing strength and the surface waterproof capacity of the artificial leather, prolongs the service life of the artificial leather, and can effectively enhance the corrosion resistance and the ultraviolet aging resistance of the artificial leather by coating a functional coating agent on the surface of the artificial leather. The invention also provides the damp-proof waterproof environment-friendly artificial leather obtained by the method.)

1. A preparation method of dampproof, waterproof and environment-friendly artificial leather is characterized by comprising the following steps:

s1, papermaking of base materials: mixing tencel fiber and viscose fiber raw material, performing coarse opening, fine opening, carding, lapping and needling to obtain non-woven fabric, and then spraying a hydrophobing agent in a spraying machine, wherein the spraying amount is 10-30g/m²After thermal contraction, sending the mixture into a presoaking tank for shaping, solidifying, extruding, drying and shaping to obtain a base material;

s2, preparing synthetic leather: uniformly coating bio-based resin on the surface of release paper, wherein the coating weight is 10-20g/m²Drying, crosslinking and curing to form a film, and then coating a layer of resin film with the coating weight of 40-60g/m²Drying to form a waterproof film, and coating a layer of 10-20g/m on the bottom of the waterproof film by a doctor blade coating method²The base material prepared in the step S1 is attached to one surface of release paper coated with the adhesive by a hot-pressing laminating machine, and the release paper is peeled after drying to prepare the synthetic leather;

s3, post-processing of synthetic leather: dyeing or printing the synthetic leather obtained in the step S2, and coating a layer of functional finishing agent on the surface of the synthetic leather, wherein the coating weight is 40-60g/m²And after drying, embossing and kneading, and processing to obtain the degradable artificial fiber synthetic leather.

2. The method for preparing artificial leather with moisture resistance, water resistance and environmental protection according to claim 1, which is characterized in that: in the step S1, the mass fraction ratio of the mixture of the tencel fiber and the viscose fiber is 1: 2-5, and the quantitative ratio of the base material is controlled to be 100-200g/m²The drying mode is one of hot air drying or drying cylinder drying, and the temperature is controlled to be 80-100 ℃.

3. The method for preparing artificial leather with moisture resistance, water resistance and environmental protection according to claim 1, which is characterized in that: in the step S1, the hydrophobic agent is AKD or ASA, the heat shrinkage temperature is 60-120 ℃, and the setting time is controlled to be 5-10 min.

4. The method for preparing artificial leather with moisture resistance, water resistance and environmental protection according to claim 1, which is characterized in that: the bio-based resin in the step S2 is prepared by the following method:

s21, adding acrylic resin and modified polylactic acid into a reaction kettle according to the mass percentage of 3:1 for reaction, controlling the reaction temperature within the range of 120-150 ℃ and the reaction time within 1-2 hours to obtain modified acrylic resin;

s22, adding the waterborne polyurethane and the styrene-acrylic emulsion into a reaction kettle according to the mass percentage of 1:1 for reaction, controlling the reaction temperature within the range of 220-250 ℃ and the reaction time within 1-2 hours to obtain modified waterborne polyurethane;

s23, adding the modified acrylic resin prepared in the step S21 and the modified waterborne polyurethane prepared in the step S22 into a high-speed stirrer according to the mass ratio of 2:1, and uniformly mixing to obtain the bio-based resin.

5. The method for preparing artificial leather with moisture resistance, water resistance and environmental protection according to claim 1, which is characterized in that: the release paper in the step S2 is selected from one of glassine release paper, PEK release paper, CCK release paper and SCK release paper.

6. The method for preparing artificial leather with moisture resistance, water resistance and environmental protection according to claim 1, which is characterized in that: the waterproof finishing agent in the step S2 is any one of polyhydroxy fatty acid ester, casein solution, nitrocellulose solution and alkyd resin, and the solid content is 30-70 wt%.

7. The method for preparing artificial leather with characteristics of moisture resistance, water resistance and environmental protection as claimed in claim 1, wherein the adhesive in step S2 is selected from any one of modified starch, dextrin adhesive, casein adhesive and water-based latex, and the solid content is 30-50 wt%.

8. The method for preparing artificial leather with moisture resistance, water resistance and environmental protection according to claim 1, which is characterized in that: the functional coating agent in the step S3 is prepared by the steps of:

s31, adding 100:300 parts by mass of glycerol and maleic anhydride into a reaction kettle, introducing nitrogen for protection, and heating to 120 ℃; then adding 0.5 part of aluminum trichloride as a catalyst, heating to 230 ℃, and preserving heat for 2 hours;

s32, adding 100 parts of butyl acetate, 50 parts of water-based acrylic acid, 5 parts of preservative and 5 parts of ultraviolet-resistant oxidant, reacting for 30 minutes at 60 ℃, and stirring and mixing uniformly to obtain modified alkyd resin;

s33, carrying out vacuum pumping on the modified alkyd resin prepared in the step 32 under reduced pressure, removing an organic solvent of butyl acetate, neutralizing with a neutralizing agent triethylamine according to the neutralization degree of 40-50%, and carrying out centrifugal separation on the modified alkyd resin and water with a high-speed centrifugal dispersing machine to obtain the modified alkyd resin with the solid content of 40-60 wt%.

9. The method for preparing artificial leather with moisture resistance, water resistance and environmental protection according to claim 8, which is characterized in that: the preservative is one of methyl p-hydroxybenzoate, ethyl p-hydroxybenzoate, propyl p-hydroxybenzoate or butyl p-hydroxybenzoate, and the ultraviolet-resistant oxidant is one of zinc oxide or cerium oxide.

10. The utility model provides a dampproofing waterproof environmental protection synthetic leather which characterized in that: prepared according to the process of any one of claims 1 to 9.

Technical Field

The invention relates to artificial leather and a preparation method thereof, in particular to a preparation method of damp-proof, waterproof and environment-friendly artificial leather.

Background

The discharge of waste, toxic gases and waste water has been a great problem in the leather production process. In the animal leather industry, a large amount of non-tanning solid leather materials, waste water and a large amount of toxic chromium salt are generated after raw leather is processed, the conversion rate of the raw materials is very low, and leather waste is generated in secondary processing of leather, such as shaving, leather grinding, edge cutting and the like. On one hand, in the artificial leather industry, because high molecules such as polyvinyl chloride and polyurethane are used as raw materials, leather products made of the raw materials can release toxic gases such as formaldehyde in long-term use, and cause harm to human bodies after long-term contact. On the other hand, most common artificial leatheroid on the market at present has poor waterproof performance, and some artificial leatheroids can reach the water-proof effect, but have the transient and water-proof effect not obvious, soak the back overnight through the rainwater, clean the surface and look clean, and still can appear a large amount of moisture content after the extrusion, can not realize waterproof for a long time.

The waterproof artificial leather on the market at present mainly has two categories, PVC waterproof leather and PU waterproof leather, PVC waterproof leather generally utilizes the characteristics of polyvinyl chloride material itself to reach waterproof efficiency, but simultaneously because the gas tightness of material itself is good, density is big, cause the product per square meter weight to exceed 500g, make the product made very heavy, people wear also uncomfortable, the water pressure resistant effect also can only reach about 3000mm, the gas permeability is poor, the plastics sense is strong, polyethylene material need add some softeners, plasticizer, smooth agent etc. simultaneously, and these substance insides contain the material that has harm to the human body, it is not environmental protection. Ordinary PU waterproof leather on the market reaches waterproof effect through the volume of scraping of scribbling of thickening polyurethane coating, has caused finished product stiff handle so, and easy fracture after the time has been long, and the cost is also high, and waterproof effect can only reach about 3000mm equally.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a preparation method of the dampproof, waterproof and environment-friendly artificial leather, which can obtain the environment-friendly artificial leather with good tearing strength and good dampproof and waterproof performances by adopting a self-made environment-friendly material as a base material and coating an environment-friendly bio-based resin, a waterproof coating agent and a functional finishing agent.

In order to realize the technical scheme, the invention provides a preparation method of dampproof, waterproof and environment-friendly artificial leather, which specifically comprises the following steps:

s1, papermaking of base materials: mixing tencel fiber and viscose fiber raw material, performing coarse opening, fine opening, carding, lapping and needling to obtain non-woven fabric, and then spraying a hydrophobing agent in a spraying machine, wherein the spraying amount is 10-30g/m²After thermal contraction, sending the mixture into a presoaking tank for shaping, solidifying, extruding, drying and shaping to obtain a base material;

s2, preparing synthetic leather: uniformly coating bio-based resin on the surface of release paper, wherein the coating weight is 10-20g/m²Drying, crosslinking and curing to form a film, and then coating a layer of resin film with the coating weight of 40-60g/m²Drying to form a waterproof film, and coating a layer of 10-20g/m on the bottom of the waterproof film by a doctor blade coating method²The base material prepared in the step S1 is attached to one surface of release paper coated with the adhesive by a hot-pressing laminating machine, and the release paper is peeled after drying to prepare the synthetic leather;

s3, post-processing of synthetic leather: dyeing or printing the synthetic leather obtained in the step S2, and coating a layer of functional finishing agent on the surface of the synthetic leather, wherein the coating weight is 40-60g/m²And after drying, embossing and kneading, and processing to obtain the degradable artificial fiber synthetic leather.

Preferably, the mass fraction ratio of the mixture of the tencel fiber and the viscose fiber in the step S1 is 1: 2-5, and the quantitative ratio of the base material is controlled to be 100-200g/m²The drying mode is one of hot air drying or drying cylinder drying, and the temperature is controlled to be 80-100 ℃. In the step S1, the hydrophobic agent is AKD or ASA, the heat shrinkage temperature is 60-120 ℃, and the setting time is controlled to be 5-10 min.

Preferably, the bio-based resin in step S2 is prepared by the following method:

s21, adding acrylic resin and modified polylactic acid into a reaction kettle according to the mass percentage of 3:1 for reaction, controlling the reaction temperature within the range of 120-150 ℃ and the reaction time within 1-2 hours to obtain modified acrylic resin;

s22, adding the waterborne polyurethane and the styrene-acrylic emulsion into a reaction kettle according to the mass percentage of 1:1 for reaction, controlling the reaction temperature within the range of 220-250 ℃ and the reaction time within 1-2 hours to obtain modified waterborne polyurethane;

s23, adding the modified acrylic resin prepared in the step S21 and the modified waterborne polyurethane prepared in the step S22 into a high-speed stirrer according to the mass ratio of 2:1, and uniformly mixing to obtain the bio-based resin.

Preferably, the release paper in step S2 is one of glassine release paper, PEK release paper, CCK release paper and SCK release paper.

Preferably, the waterproof coating agent in step S2 is any one of polyhydroxyalkanoate, casein solution, nitrocellulose solution, and alkyd resin, and the solid content is 30 to 70 wt%.

Preferably, in the step S2, the binder is selected from any one of modified starch, dextrin binder, casein binder and water-based latex, and the solid content is 30-50 wt%.

Preferably, the functional coating agent in step S3 is prepared by the steps of:

s31, adding 100:300 parts by mass of glycerol and maleic anhydride into a reaction kettle, introducing nitrogen for protection, and heating to 120 ℃; then adding 0.5 part of aluminum trichloride as a catalyst, heating to 230 ℃, and preserving heat for 2 hours;

s32, adding 100 parts of butyl acetate, 50 parts of water-based acrylic acid, 5 parts of preservative and 5 parts of ultraviolet-resistant oxidant, reacting for 30 minutes at 60 ℃, and stirring and mixing uniformly to obtain modified alkyd resin;

s33, carrying out vacuum pumping on the modified alkyd resin prepared in the step 32 under reduced pressure, removing an organic solvent of butyl acetate, neutralizing with a neutralizing agent triethylamine according to the neutralization degree of 40-50%, and carrying out centrifugal separation on the modified alkyd resin and water with a high-speed centrifugal dispersing machine to obtain the modified alkyd resin with the solid content of 40-60 wt%.

Preferably, the preservative is one of methyl parahydroxybenzoate, ethyl parahydroxybenzoate, propyl parahydroxybenzoate or butyl parahydroxybenzoate, and the ultraviolet-resistant oxidant is one of zinc oxide or cerium oxide.

The invention also provides the damp-proof waterproof environment-friendly artificial leather prepared by the method.

The preparation method of the damp-proof waterproof environment-friendly artificial leather provided by the invention has the beneficial effects that:

1. the method adopts the non-woven fabric made of tencel fibers and viscose fibers as raw materials as a base material, is safe and environment-friendly, can be degraded in natural environment, can enhance the waterproof and moistureproof capacity of the base material by spraying a hydrophobic agent on the surface of the base material, can uniformly cover the surface of the base material with bio-based resin and a waterproof coating agent by realizing the synthesis of artificial leather by adopting a release paper method, can effectively enhance the tearing strength and the surface waterproof capacity of the artificial leather, prolongs the service life of the artificial leather, and can effectively enhance the corrosion resistance and the ultraviolet aging resistance of the artificial leather by coating a functional coating agent on the surface of the artificial leather.

2. The method uses the self-made bio-based resin, is environment-friendly and non-toxic, does not pollute the environment, can greatly improve the tearing strength of the artificial leather when being coated on the surface of the artificial leather, ensures that the tearing strength is the same as that of real leather, and can improve the service life of the artificial leather.

3. The method not only can effectively enhance the waterproof performance and hand feeling of the artificial leather by coating the self-made functional coating agent on the surface of the artificial leather, but also can effectively enhance the corrosion resistance and ultraviolet aging resistance of the artificial leather by adding the functional auxiliary agent.

Drawings

FIG. 1 is a schematic flow chart of the present invention.

Fig. 2 is a diagram of an artificial leather product manufactured by the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person skilled in the art without making any inventive step are within the scope of the present invention.