阅读说明：本技术 一种保暖面料用浆料及其制备方法和应用 (Sizing agent for thermal fabric and preparation method and application thereof ) 是由 宋辉辉 曾国坪 张伟强 王志勇 赵尚振 于 2020-12-15 设计创作，主要内容包括：本发明提供了一种保暖面料用浆料及其制备方法和应用；所述保暖面料用浆料由包括以下组分的原料制备而成：聚酰亚胺2重量份～10重量份；溶剂25重量份～35重量份；粘合剂80重量份～120重量份；交联剂5重量份～10重量份；促进剂2重量份～5重量份；所述的交联剂为封端的异氰酸酯。与现有技术相比,本发明提供的保暖面料用浆料利用聚酰亚胺材料导热率低的特点,采用特定含量组分,实现整体较好的相互作用,能够赋予面料极佳的保暖隔热性能,并且稳定性好,不会因为染整加工工序对其结构和性能造成任何影响,适用于保暖面料的制备。(The invention provides a slurry for a thermal fabric, a preparation method and application thereof; the sizing agent for the thermal fabric is prepared from the following raw materials: 2-10 parts of polyimide; 25-35 parts by weight of a solvent; 80-120 parts by weight of an adhesive; 5-10 parts of a cross-linking agent; 2-5 parts of accelerator; the cross-linking agent is blocked isocyanate. Compared with the prior art, the slurry for the thermal fabric provided by the invention utilizes the characteristic of low thermal conductivity of the polyimide material, adopts specific content components, realizes better overall interaction, can endow the fabric with excellent thermal insulation and heat-insulating properties, has good stability, can not cause any influence on the structure and the performance of the fabric due to dyeing and finishing processing, and is suitable for preparing the thermal fabric.)

1. The sizing agent for the thermal fabric is prepared from the following raw materials:

2-10 parts of polyimide;

25-35 parts by weight of a solvent;

80-120 parts by weight of an adhesive;

5-10 parts of a cross-linking agent;

2-5 parts of accelerator;

the cross-linking agent is blocked isocyanate.

2. The pulp for thermal fabrics according to claim 1, characterized in that said solvent is selected from dimethylacetamide and/or dimethylformamide.

3. The slurry for thermal fabrics according to claim 1, wherein the binder is selected from solvent-based polyurethane resins and/or solvent-based acrylic resins.

4. The slurry for thermal fabrics according to claim 1, wherein the accelerator is one or more selected from the group consisting of silane-based accelerators, titanate-based accelerators, zirconium aluminate-based accelerators, and alkyl phosphate-based accelerators.

5. A preparation method of the pulp for the thermal fabric according to any one of claims 1 to 4, comprising the following steps:

a) mixing polyimide and a solvent to obtain a first mixture;

b) mixing the first mixture obtained in the step a) with an adhesive, a cross-linking agent and an accelerant, and stirring to obtain the slurry for the thermal fabric.

6. The method according to claim 5, wherein the stirring in step b) is performed at a rotation speed of 500 to 1500r/min for 3 to 10 min.

7. A method for preparing a thermal fabric comprises the following steps:

applying the slurry to the back surface of the fabric, and drying to obtain the warm-keeping fabric;

the pulp is the pulp for the thermal fabric according to any one of claims 1 to 4.

8. The method of claim 7, wherein the fabric is a pretreated fabric; the pretreatment mode comprises one or more of oil removal, desizing, dyeing and sizing.

9. The method according to claim 7, characterized in that the manner of applying the size to the reverse side of the facing is coating or printing;

the thickness of the application is 1mm to 3 mm.

10. The method according to claim 7, wherein the drying temperature is 140-170 ℃ and the drying time is 2-10 min.

Technical Field

The invention relates to the technical field of functional fabrics, in particular to a slurry for a thermal fabric, and a preparation method and application thereof.

Background

With the development of economy and the progress of society, the functional requirements of people on clothes are gradually improved, and the warm-keeping fabric becomes a hot spot for research and development in the field of clothes. In recent years, the prior art mainly improves the heat preservation performance of the fabric through functional chemicals. For example, Chinese patent with publication number CN107447536A discloses a thermal fabric and a preparation process thereof, wherein ceramic powder is added into spinning solution or coating slurry to realize the far infrared thermal function of the fabric; as disclosed in chinese patent publication No. CN109235085A, a graphene slurry, a fabric, a method for preparing the same, and a garment are provided, in which a graphene raw material is added to a spinning solution or a coating slurry to realize a far infrared thermal insulation function of the fabric; for another example, chinese patent publication No. CN110983795A discloses an aerogel thermal insulation coating fabric and a method for preparing the same, wherein aerogel raw materials are added into the slurry and applied to the fabric in a coating manner, and the thermal insulation performance of the fabric is realized by utilizing the characteristic of extremely low thermal conductivity of aerogel.

However, the method for improving the heat-insulating property of the fabric by adding the ceramic powder and the graphene utilizes the far infrared property of the material to improve the heating rate or the heat-insulating property of the fabric, and actually, the heat-insulating rate and the clo value of the fabric are not really improved, so that the actual experience of a wearer is not obvious; and the aerogel material is very fragile, so that the structure of the aerogel material is damaged in the processing process, the porosity is reduced, the amount of static air is greatly reduced, and the effect is very limited.

Polyimide (PI) as a special engineering material has the characteristics of strong mechanical property, good insulating property, radiation resistance, good heat insulation property, good stability and the like, and is widely applied to the fields of aviation, aerospace, electronics and electrical engineering, semiconductor engineering and the like. In recent years, with the development of polyimide technology, the application of polyimide in the field of clothing has been researched and developed more and more, for example, companies such as German winning creations, Kawasaki, Jiangsu Olympic and the like prepare polyimide materials into yarns which are applied to the development of fabrics of fire-fighting suits and thermal underwear.

However, when the polyimide yarn is used in the field of clothing, the spinning and spinning difficulty is high, the productivity is low, and the cost is very high; moreover, polyimide has natural yellow color, and the fabric cannot be dyed, so that the application of the polyimide to civil clothing is greatly limited.

Disclosure of Invention

In view of the above, the invention aims to provide a slurry for a thermal fabric, and a preparation method and an application thereof.

The invention provides a slurry for a thermal fabric, which is prepared from the following raw materials:

2-10 parts of polyimide;

25-35 parts by weight of a solvent;

80-120 parts by weight of an adhesive;

5-10 parts of a cross-linking agent;

2-5 parts of accelerator;

the cross-linking agent is blocked isocyanate.

Preferably, the solvent is selected from dimethylacetamide and/or dimethylformamide.

Preferably, the binder is selected from solvent-based polyurethane resins and/or solvent-based acrylic resins.

Preferably, the accelerator is selected from one or more of a silane-based accelerator, a titanate-based accelerator, a zirconium aluminate-based accelerator, and an alkyl phosphate-based accelerator.

The invention also provides a preparation method of the slurry for the thermal fabric, which comprises the following steps:

a) mixing polyimide and a solvent to obtain a first mixture;

b) mixing the first mixture obtained in the step a) with an adhesive, a cross-linking agent and an accelerant, and stirring to obtain the slurry for the thermal fabric.

Preferably, the rotating speed of the stirring in the step b) is 500 r/min-1500 r/min, and the time is 3 min-10 min.

The invention also provides a method for preparing the thermal fabric, which comprises the following steps:

applying the coating slurry to the back surface of the fabric, and drying to obtain the warm-keeping fabric;

the coating slurry is the slurry for the thermal fabric in the technical scheme.

Preferably, the fabric is a pretreated fabric; the pretreatment mode comprises one or more of oil removal, desizing, dyeing and sizing.

Preferably, the mode of applying the sizing agent to the reverse side of the fabric is coating or printing;

the thickness of the application is 1mm to 3 mm.

Preferably, the drying temperature is 140-170 ℃ and the drying time is 2-10 min.

The invention provides a slurry for a thermal fabric, a preparation method and application thereof; the sizing agent for the thermal fabric is prepared from the following raw materials: 2-10 parts of polyimide; 25-35 parts by weight of a solvent; 80-120 parts by weight of an adhesive; 5-10 parts of a cross-linking agent; 2-5 parts of accelerator; the cross-linking agent is blocked isocyanate. Compared with the prior art, the slurry for the thermal fabric provided by the invention utilizes the characteristic of low thermal conductivity of the polyimide material, adopts specific content components, realizes better overall interaction, can endow the fabric with excellent thermal insulation and heat-insulating properties, has good stability, can not cause any influence on the structure and the performance of the fabric due to dyeing and finishing processing, and is suitable for preparing the thermal fabric. Experimental results show that the irradiation temperature difference of the polyimide thermal coating fabric prepared from the slurry for the thermal fabric is 7.2-7.8 ℃, the Crohn value is 0.16-0.22, the heat preservation rate is 23.6-27%, and the thermal conductivity is 0.0647W (m.K) -0.103W (m.K). In addition, the preparation method provided by the invention is simple in process, easy in condition control and suitable for large-scale production and application.

In addition, the method for preparing the thermal fabric provided by the invention can apply the polyimide material to the fabric in a simpler and lower-cost mode, overcomes various technical problems of spinning, dyeing and the like of the polyimide material in the prior art, and has wide application prospect.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a slurry for a thermal fabric, which is prepared from the following raw materials:

2-10 parts of polyimide;

25-35 parts by weight of a solvent;

80-120 parts by weight of an adhesive;

5-10 parts of a cross-linking agent;

2-5 parts of accelerator;

the cross-linking agent is blocked isocyanate.

In the invention, the slurry for the thermal fabric comprises polyimide, a solvent, an adhesive, a cross-linking agent and an accelerant, and preferably consists of the polyimide, the solvent, the adhesive, the cross-linking agent and the accelerant.

In the present invention, the polyimide is preferably a polyimide powder; the polyimide powder of the present invention is not particularly limited in its source, and commercially available products known to those skilled in the art may be used. In the present invention, the average particle diameter of the polyimide powder is preferably 1 to 10 μm, and more preferably 4 to 5 μm. In the invention, the slurry for the thermal fabric comprises 2 to 10 parts by weight of polyimide, preferably 5 to 10 parts by weight.

In the present invention, the solvent is preferably selected from Dimethylacetamide (DMAC) and/or Dimethylformamide (DMF), more preferably Dimethylformamide (DMF). The source of the solvent is not particularly limited in the present invention, and commercially available products of the above-mentioned Dimethylacetamide (DMAC) and Dimethylformamide (DMF) known to those skilled in the art may be used. In the invention, the thermal fabric slurry comprises 25 to 35 parts by weight of solvent, preferably 30 parts by weight.

In the present invention, the binder is preferably selected from solvent-based urethane resins and/or solvent-based acrylic resins, and more preferably solvent-based urethane resins. The source of the adhesive in the present invention is not particularly limited, and commercially available products of the above solvent-type urethane resin and solvent-type acrylic resin known to those skilled in the art may be used. In the invention, the slurry for the thermal fabric comprises 80 to 120 parts by weight of the adhesive, preferably 100 parts by weight.

In the present invention, the crosslinking agent is a blocked isocyanate. The source of the crosslinking agent is not particularly limited in the present invention, and commercially available blocked isocyanates known to those skilled in the art may be used. In the invention, the sizing agent for the thermal fabric comprises 5 to 10 parts by weight of the cross-linking agent, preferably 5 to 8 parts by weight.

In the present invention, the accelerator is preferably one or more selected from the group consisting of silane accelerators, titanate accelerators, zirconium aluminate accelerators and alkyl phosphate accelerators, and more preferably a silane accelerator. The source of the accelerator is not particularly limited in the present invention, and commercially available products of the above-mentioned silane-based accelerator, titanate-based accelerator, zirconium aluminate-based accelerator, and alkyl phosphate-based accelerator, which are well known to those skilled in the art, may be used. In the invention, the slurry for the thermal fabric comprises 2 to 5 parts by weight of the accelerant, preferably 3 to 5 parts by weight.

The slurry for the thermal fabric is polyimide slurry, utilizes the characteristic of low thermal conductivity of polyimide materials, adopts specific content components, realizes better overall interaction, can endow the fabric with excellent thermal insulation and heat insulation performance, has good stability, can not cause any influence on the structure and the performance of the fabric due to dyeing and finishing processing, and is suitable for preparing the thermal fabric.

The invention also provides a preparation method of the slurry for the thermal fabric, which comprises the following steps:

a) mixing polyimide and a solvent to obtain a first mixture;

b) mixing the first mixture obtained in the step a) with an adhesive, a cross-linking agent and an accelerant, and stirring to obtain the slurry for the thermal fabric.

In the present invention, first, a polyimide and a solvent are mixed to obtain a first mixture. In the present invention, the polyimide and the solvent are the same as those in the above technical solution, and are not described herein again.

The mixing mode is not particularly limited by the invention, and the technical scheme of simple stirring well known to those skilled in the art is adopted, so that the raw materials are uniformly mixed.

After the first mixture is obtained, the obtained first mixture is mixed with the adhesive, the cross-linking agent and the accelerant and then stirred to obtain the slurry for the thermal fabric. In the present invention, the binder, the cross-linking agent and the accelerator are the same as those in the above technical solution, and are not described herein again.

In the present invention, the stirring device is preferably an electric stirrer well known to those skilled in the art; the rotating speed of the stirring is preferably 500 r/min-1500 r/min, and more preferably 1000 r/min; the stirring time is preferably 3 to 10min, and more preferably 5 min.

The preparation method provided by the invention is simple in process, easy in condition control and suitable for large-scale production and application.

The invention also provides a method for preparing the thermal fabric, which comprises the following steps:

applying the coating slurry to the back surface of the fabric, and drying to obtain the warm-keeping fabric;

the coating slurry is the slurry for the thermal fabric in the technical scheme.

In the invention, the fabric comprises one or more of the following fiber materials: cotton, viscose, terylene, chinlon and spandex; the structure of the fabric is not particularly limited, and the fabric can be a knitted structure (knitted fabric), such as plain knitted fabric, or a woven structure (woven fabric), such as chiffon; meanwhile, the fabric has no dyeing requirement, and can be white cloth or dyed fabric.

In the invention, the fabric is preferably a pretreated fabric; the pretreatment preferably includes one or more of degreasing, desizing, dyeing, and setting.

In the present invention, the coating slurry is preferably applied to the reverse side of the fabric in a coating or printing manner; wherein the coating preferably comprises coating with a knife coating apparatus or coating with a cylinder coater. In the present invention, the coating with the knife coating apparatus is preferably applied to a woven fabric; the coating with a rotary screen coater is preferably suitable for knits.

In the present invention, the thickness of the application is preferably 1mm to 3mm, more preferably 2 mm.

In the invention, the drying temperature is preferably 140-170 ℃, and more preferably 150-160 ℃; the drying time is preferably 2min to 10min, and more preferably 3 min. The drying method is not particularly limited, and the technical scheme of baking known to those skilled in the art can be adopted.

Compared with a method for realizing the heat-insulating property of the fabric by using polyimide yarns, the method for preparing the heat-insulating fabric is simple to process, controllable in cost and flexible in application, and is not limited by the fiber components of the fabric; and because the sizing agent is applied to the reverse side of the fabric (textile), the yellow color of the polyimide has small influence on the appearance of the fabric. Compared with the traditional method for realizing the heat-insulating property of the fabric by using the ceramic powder and the graphene, the method provided by the invention has the advantages that the heat-insulating property of the fabric is realized by utilizing the characteristic of low heat conductivity of the polyimide material, the mechanical property of the polyimide material is very high, the stability in chemicals is good, and the structure and the performance of the polyimide material cannot be influenced by dyeing and finishing processing procedures, so that the heat-insulating effect and the heat-insulating rate of the polyimide material are far better than those of other processing modes.

The invention provides a slurry for a thermal fabric, a preparation method and application thereof; the sizing agent for the thermal fabric is prepared from the following raw materials: 2-10 parts of polyimide; 25-35 parts by weight of a solvent; 80-120 parts by weight of an adhesive; 5-10 parts of a cross-linking agent; 2-5 parts of accelerator; the cross-linking agent is blocked isocyanate. Compared with the prior art, the slurry for the thermal fabric provided by the invention utilizes the characteristic of low thermal conductivity of the polyimide material, adopts specific content components, realizes better overall interaction, can endow the fabric with excellent thermal insulation and heat-insulating properties, has good stability, can not cause any influence on the structure and the performance of the fabric due to dyeing and finishing processing, and is suitable for preparing the thermal fabric. Experimental results show that the irradiation temperature difference of the polyimide thermal coating fabric prepared from the slurry for the thermal fabric is 7.2-7.8 ℃, the Crohn value is 0.16-0.22, the heat preservation rate is 23.6-27%, and the thermal conductivity is 0.0647W (m.K) -0.103W (m.K).

In addition, the preparation method provided by the invention is simple in process, easy in condition control and suitable for large-scale production and application.

In addition, the method for preparing the thermal fabric provided by the invention can apply the polyimide material to the fabric in a simpler and lower-cost mode, overcomes various technical problems of spinning, dyeing and the like of the polyimide material in the prior art, and has wide application prospect.

To further illustrate the present invention, the following examples are provided for illustration. The polyimide powder used in the following examples of the present invention was P84 NT produced by winning and creating company, and the average particle size of the powder was 4 μm; the type of the solvent type polyurethane is Dongcheng chemical DAC-230; the type of the cross-linking agent is Dongcheng chemical DAC-555; the promoter used is Dongcheng chemical DAC-950; the ceramic powder is far infrared nanometer ceramic powder produced by Tianjin hongyan Tianshan practical nanometer Limited company, and the particle size of the powder is 1200 meshes; the type of the used graphene powder is SE4101 produced by Heizhou sixth-element material science and technology Limited.

Example 1

(1) 5 parts by weight of polyimide powder and 30 parts by weight of DMF were mixed and stirred uniformly to obtain a first mixture.

(2) And (2) mixing the first mixture obtained in the step (1) with 100 parts by weight of solvent type polyurethane, 5 parts by weight of cross-linking agent and 3 parts by weight of accelerator, and stirring for 5min at the speed of 1000r/min by using an electric stirrer to obtain polyimide coating slurry, namely the slurry for the thermal fabric.

Application example 1

The polyimide coating paste provided in example 1 was applied by coating to a desized, dyed and sized fabric (50D pongee (100% polyester) with a gram weight of 80g/m²) The thickness of the fabric coating on the reverse side of the fabric is 2mm, and the polyimide thermal coating fabric is obtained after baking for 3min at 150 ℃.

Comparative example 1

Mixing 30 parts by weight of DMF (dimethyl formamide) with 100 parts by weight of solvent type polyurethane, 5 parts by weight of cross-linking agent and 3 parts by weight of accelerator, and stirring for 5min at the speed of 1000r/min by using an electric stirrer to obtain common coating slurry.

Application comparative example 1

The conventional coating slip provided in comparative example 1 was applied by coating to desized, dyed and sized face fabric (50D Chunzan (100% polyester) with a gram weight of 80g/m²) The thickness of the coating layer on the reverse side of the fabric is 2mm, and the fabric is baked for 3min at 150 ℃ to obtain the common coating fabric.

Comparative example 2

(1) 5 parts by weight of ceramic powder and 30 parts by weight of DMF are mixed and simply and uniformly stirred to obtain a first mixture.

(2) And (2) mixing the first mixture obtained in the step (1) with 100 parts by weight of solvent type polyurethane, 5 parts by weight of cross-linking agent and 3 parts by weight of accelerator, and stirring for 5min at the speed of 1000r/min by using an electric stirrer to obtain ceramic powder coating slurry.

Comparative application example 2

The ceramic powder coating slurry provided in comparative example 2 was applied by coating to a desized, dyed and sized fabric (50D pongee (100% polyester) with a gram weight of 80g/m²) The thickness of the fabric coating on the reverse side of the fabric is 2mm, and the fabric is baked for 3min at 150 ℃ to obtain the ceramic powder coating fabric.

Comparative example 3

(1) Mixing 5 parts by weight of graphene powder and 30 parts by weight of DMF, and simply and uniformly stirring to obtain a first mixture.

(2) And (2) mixing the first mixture obtained in the step (1) with 100 parts by weight of solvent type polyurethane, 5 parts by weight of cross-linking agent and 3 parts by weight of accelerator, and stirring for 5min at the speed of 1000r/min by using an electric stirrer to obtain graphene powder coating slurry.

Comparative application example 3

The graphene powder coating slurry provided in comparative example 3 was applied to the desized, dyed and sized fabric (50D pongee (100% polyester) by coating, having a gram weight of 80g/m²) The thickness of the coating layer on the reverse side of the graphene coated fabric is 2mm, and the graphene coated fabric is obtained after baking for 3min at 150 ℃.

Example 2

(1) 10 parts by weight of polyimide powder and 30 parts by weight of DMF were mixed and stirred uniformly to obtain a first mixture.

(2) And (2) mixing the first mixture obtained in the step (1) with 100 parts by weight of solvent type polyurethane, 8 parts by weight of cross-linking agent and 5 parts by weight of accelerator, and stirring for 5min at the speed of 1000r/min by using an electric stirrer to obtain polyimide coating slurry, namely the slurry for the thermal fabric.

Application example 2

The polyimide coating slurry provided in example 2 was applied by coating to a desized, dyed and sized fabric (75D taslon (100% polyester) with a grammage of 130g/m²) The thickness of the fabric coating on the reverse side of the fabric is 2mm, and the polyimide thermal coating fabric is obtained after baking for 3min at 160 ℃.

Examples of the experiments

The polyimide thermal-insulation coating fabric prepared in the application examples 1-2 and the coating fabric prepared in the application comparative examples 1-3 are subjected to various performance tests; the method specifically comprises the following steps:

(1) the test method adopted by the irradiation temperature difference is F042 appendix A (irradiation distance is 20.0cm, irradiation time is 10.0 min);

(2) the test method adopted by the Crohn value and the heat preservation rate is GB/T11048-2008 (B type instrument);

(3) the test method adopted by the thermal conductivity is GB/T11048-2008 (A type instrument);

the results are shown in Table 1.

TABLE 1 product Performance data

Fabric	Temperature difference of irradiation, deg.C	Crohn value	Rate of heat preservation	Thermal conductivity, W (m.K)
					Application example 1 sample	7.2	0.16	23.6％	0.103
Application of comparative example 1 sample	5.6	0.0833	13.3％	0.197
					Application of comparative example 2 sample	5.8	0.0855	14.6％	0.189
Application of comparative example 3 sample	6.2	0.0799	12.9％	0.208
					Application example 2 sample	7.8	0.22	27％	0.0647

From the test results, the heat-insulating property of the polyimide coating fabric is obviously superior to that of a common polyurethane coating sample, a ceramic powder coating sample and a graphene coating sample, and the heat-insulating effect is very obvious.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.