Breathable microfiber leather and preparation method thereof

Abstract

The invention relates to the technical field of microfiber leather, and discloses breathable microfiber leather and a preparation method thereof.The breathable microfiber leather comprises a microfiber leather body, and the microfiber leather body is composed of a base body layer, a middle layer and a surface layer. According to the air-permeable microfiber leather, the air-permeable additive is added into the middle layer and the surface layer on the microfiber leather body, so that a fine air-permeable structure can be formed in the material, and air and moisture can freely circulate, so that the air permeability and moisture penetrability of the microfiber leather are improved, and the microfiber leather has good air permeability; according to the present invention, by adding the air-permeable auxiliary agent, the free circulation of air and water in the material can be ensured, the sweat and the moisture on the human skin surface can be effectively discharged, the skin can be kept dry and comfortable, and the stuffiness and the discomfort can be reduced, and the surfactant is added to the air-permeable auxiliary agent so as to reduce the surface tension of the resin and promote the fluidity and the uniformity of the resin during the processing process; therefore, a finer and more uniform micropore structure can be formed, and the ventilation effect of the produced microfiber leather is improved.

Description

Technical Field

[0001] The invention relates to the technical field of ultra-fine leather, and in particular to a breathable ultra-fine leather and a preparation method thereof. Background Art

[0002] Superfine fiber synthetic leather is referred to as superfine leather. It takes sea-island fiber nonwoven fabric as the base material, impregnated with polyurethane slurry and solidified by wet method to form sea-island fiber / polyurethane composite material, and then undergoes fiber opening (dissolution method, alkali reduction or toluene reduction) to obtain superfine fiber / polyurethane composite material, that is, superfine fiber synthetic leather base fabric. Finally, after different finishing processes, it can produce smooth superfine leather or suede superfine leather with wear resistance, cold resistance, breathability and aging resistance. It has become an ideal material to replace natural leather. Because the fiber of superfine leather is very fine, it is closer to natural leather in terms of microstructure and performance, and has better mechanical properties.

[0003] Breathability is a factor that must be considered in many application scenarios. For example, in products that require good breathability, such as sports shoes and outdoor equipment, the current microfiber leather has poor breathability, and non-breathable microfiber leather may not meet the use requirements, thus limiting its application scope. In addition, breathability is one of the important indicators for measuring the wearing comfort of a material. When non-breathable microfiber leather is used or worn for a long time, it is easy for sweat and moisture on the surface of the human skin to be unable to be effectively discharged, causing the skin to be damp and stuffy, and even causing discomfort or skin problems such as eczema and prickly heat. Summary of the invention

[0004] In view of the poor air permeability of the above-mentioned existing microfiber leather, and the non-breathable microfiber leather may not meet the use requirements, thereby limiting its application scope. At the same time, the non-breathable microfiber leather is easy to make the sweat and moisture on the surface of the human skin unable to be effectively discharged when used or worn for a long time, resulting in damp and stuffy skin, and even causing discomfort or skin problems such as eczema, prickly heat, etc., the present invention is proposed.

[0005] Therefore, the purpose of the present invention is to provide a breathable microfiber leather, the purpose of which is to make the microfiber leather have good air permeability, ensure that air and moisture can flow freely inside the material, effectively discharge sweat and moisture on the surface of human skin, keep the skin dry and comfortable, and reduce stuffiness and discomfort.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a breathable microfiber leather, comprising a microfiber leather body, wherein the microfiber leather body is composed of a base layer, an intermediate layer and a surface layer;

[0007] The base layer has excellent mechanical properties and durability;

[0008] The intermediate layer is used to enhance the performance of the material;

[0009] The surface layer has excellent wear resistance, tear resistance and elasticity.

[0010] As a preferred solution of the breathable microfiber leather of the present invention, the base layer is composed of microfiber non-woven fabric, which is used as the skeleton and support of the microfiber leather.

[0011] As a preferred embodiment of the breathable microfiber leather of the present invention, the contents of the components in the middle layer are as follows by weight: 100-125 parts of microfibers, 60-80 parts of resins, 20-40 parts of polyurethanes, 15-25 parts of dimethylformamide, 5-10 parts of butanone and 10-20 parts of breathable additives.

[0012] As a preferred embodiment of the breathable microfiber leather of the present invention, the content of each component in the surface layer is as follows by weight: 80-110 parts of fine fibers, 80-100 parts of polyurethane, 10-25 parts of dimethylformamide, 7-15 parts of butanone and 20-30 parts of breathable additive.

[0013] As a preferred solution of the breathable microfiber leather of the present invention, the breathable auxiliary agent is composed of modified polysiloxane, a surfactant, a cross-linking agent, a stabilizer and a leveling agent.

[0014] As a preferred embodiment of the breathable microfiber leather described in the present invention, the content of each component in the breathable additive is as follows by weight: 30-45 parts of modified polysiloxane, 15-25 parts of surfactant, 5-8 parts of crosslinking agent, 7-15 parts of stabilizer and 3-6 parts of leveling agent.

[0015] To achieve the above object, the present invention provides the following technical solution: a method for preparing breathable microfiber leather, comprising the following steps:

[0016] S1, a base layer is made by interweaving ultrafine fiber nonwoven fabrics by combing, needle punching and other processes to form a three-dimensional network structure;

[0017] S2, preparing a breathable agent, first pre-mixing the modified polysiloxane, surfactant, cross-linking agent, stabilizer and leveling agent in a certain proportion to ensure uniform dispersion of the components, and then allowing the pre-mixed components to undergo a chemical reaction under the conditions of temperature, pressure and catalyst of 80-110 degrees, and then after the reaction is completed, filtering, washing, drying and other post-treatment operations are performed on the product to remove impurities, adjust the particle size and improve the purity, and finally form a breathable agent;

[0018] S3, preparing the middle layer coating, first taking out the ultrafine fiber and the resin, adding the polyurethane and dimethylformamide, and then putting them into a stirring device for stirring and mixing, then adding butanone and the breathable additive prepared in S2, and stirring them sufficiently to form the coating;

[0019] S4, coating the coating prepared in S3 on the surface of the base layer by a roller coating device, and then sending it into a heating device to heat it at 90-100 degrees so that an intermediate layer is attached to the surface of the base layer;

[0020] S5, preparing the surface coating, first taking out the fine fibers and the polyurethane to mix and stir, then adding dimethylformamide to continue stirring and mixing, then adding butanone and the air permeability aid prepared in S2, and stirring sufficiently to form the coating;

[0021] S6, finally, the coating prepared in S5 is coated on the surface of the middle layer by a roller coating device, and then sent to a heating device for heating at 90-100 degrees so that a surface layer is attached to the surface of the middle layer;

[0022] S7, using a baking oven to bake the microfiber leather at high temperature to mature it, controlling the temperature to be maintained at 100-120° C., and then the microfiber leather is manufactured after it is cooled.

[0023] The beneficial effects of the present invention are as follows: by adding a breathable additive to the middle layer and the surface layer on the microfiber leather body, a fine permeable structure can be formed inside the material, allowing air and moisture to flow freely, thereby improving the air permeability and moisture permeability of the microfiber leather, and making the microfiber leather have good air permeability, which can ensure that air and moisture can flow freely inside the material, effectively discharge sweat and moisture on the surface of human skin, keep the skin dry and comfortable, and reduce the feeling of stuffiness and discomfort. At the same time, adding a surfactant to the breathable additive can reduce the surface tension of the resin, promote the fluidity and uniformity of the resin during the processing, thereby helping to form a more delicate and uniform microporous structure, and further improving the breathability effect of the produced microfiber leather. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0025] Figure 1 It is a schematic diagram of the overall structure of the breathable microfiber leather of the present invention.

[0026] Description of reference numerals:

[0027] 1. Microfiber leather body; 2. Base layer; 3. Middle layer; 4. Surface layer. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0029] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0030] Example 1

[0031] Reference Figure 1 , which is the first embodiment of the present invention, provides a breathable microfiber leather, the breathable microfiber leather comprises a microfiber leather body 1, the microfiber leather body 1 is composed of a base layer 2, an intermediate layer 3 and a surface layer 4;

[0032] The base layer 2 has excellent mechanical properties and durability;

[0033] The middle layer 3 is used to enhance the performance of the material;

[0034] The surface layer 4 has excellent wear resistance, tear resistance and elasticity.

[0035] The base layer 2 is composed of ultra-fine fiber non-woven fabric, which is used as the skeleton and support of the ultra-fine leather. The ultra-fine fibers are three-dimensionally cross-linked, similar to the collagen fiber structure in the dermis. This structure not only gives the ultra-fine leather excellent mechanical properties, but also makes it have good durability and stability during use.

[0036] The contents of the components in the middle layer 3 in parts by weight are as follows: 100 parts of ultrafine fibers, 60 parts of resin, 20 parts of polyurethane, 15 parts of dimethylformamide, 5 parts of butanone and 10 parts of a breathable additive.

[0037] The contents of the components in the surface layer 4 in parts by weight are as follows: 80 parts of fine fibers, 80 parts of polyurethane, 10 parts of dimethylformamide, 7 parts of butanone and 20 parts of a breathable additive.

[0038] The breathable additive is composed of modified polysiloxane, surfactant, cross-linking agent, stabilizer and leveling agent. The breathable additive can form a fine permeable structure inside the material, allowing air and moisture to flow freely, thereby improving the air permeability and moisture permeability of the microfiber leather.

[0039] The content of each component in the breathable additive by weight is as follows: 30 parts of modified polysiloxane, 15 parts of surfactant, 5 parts of crosslinking agent, 7 parts of stabilizer and 3 parts of leveling agent. Modified polysiloxane is an important breathable additive component. It can form fine microporous structures in the resin layer. These microporous structures can allow air and water molecules to pass through, thereby improving the air permeability and moisture permeability of the microfiber leather. Surfactant is another common breathable additive component. It can reduce the surface tension of the resin and promote the fluidity and uniformity of the resin during the processing, thereby helping to form a more delicate and uniform microporous structure. Finally, the crosslinking agent, stabilizer and leveling agent can promote the crosslinking reaction of the resin, improve the stability of the material and improve the surface properties of the material during the production process of the microfiber leather.

[0040] A method for preparing breathable microfiber leather comprises the following steps:

[0041] S1, a base layer 2 is made by interweaving ultrafine fiber nonwoven fabrics by combing, needle punching and other processes to form a three-dimensional network structure;

[0042] S2, preparing a breathable agent, first pre-mixing the modified polysiloxane, surfactant, cross-linking agent, stabilizer and leveling agent in a certain proportion to ensure uniform dispersion of the components, and then allowing the pre-mixed components to undergo a chemical reaction under the conditions of temperature, pressure and catalyst of 80-110 degrees, and then after the reaction is completed, filtering, washing, drying and other post-treatment operations are performed on the product to remove impurities, adjust the particle size and improve the purity, and finally form a breathable agent;

[0043] S3, preparing the coating of the middle layer 3, first taking out the ultrafine fibers and the resin, adding the polyurethane and dimethylformamide, and then putting them into a stirring device for stirring and mixing, then adding butanone and the air permeability aid prepared in S2, and stirring them sufficiently to form the coating;

[0044] S4, using a roller coating device to apply the coating prepared in S3 on the surface of the base layer 2, and then sending it into a heating device to heat it at 90-100 degrees so that a layer of intermediate layer 3 is attached to the surface of the base layer 2;

[0045] S5, preparing the surface layer 4 coating, first taking out the fine fibers and the polyurethane to mix and stir, then adding dimethylformamide to continue stirring and mixing, then adding butanone and the air permeability aid prepared in S2, and stirring sufficiently to form the coating;

[0046] S6, finally, the coating prepared in S5 is coated on the surface of the middle layer 3 by a roller coating device, and then sent to a heating device for heating at 90-100 degrees so that a surface layer 4 is attached to the surface of the middle layer 3;

[0047] S7, using a baking oven to bake the microfiber leather at high temperature to mature it, controlling the temperature to be maintained at 100-120° C., and then the microfiber leather is manufactured after it is cooled.

[0048] Example 2

[0049] Reference Figure 1 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: the content of each component in the middle layer 3 by weight is as follows: 115 parts of ultrafine fibers, 70 parts of resin, 30 parts of polyurethane, 20 parts of dimethylformamide, 7 parts of butanone and 15 parts of breathable additives; the content of each component in the surface layer 4 by weight is as follows: 95 parts of fine fibers, 90 parts of polyurethane, 15 parts of dimethylformamide, 9 parts of butanone and 25 parts of breathable additives; the content of each component in the breathable additive by weight is as follows: 40 parts of modified polysiloxane, 20 parts of surfactant, 6.5 parts of cross-linking agent, 11 parts of stabilizer and 4.5 parts of leveling agent.

[0050] The remaining structures are the same as those of Example 1.

[0051] Example 3

[0052] Reference Figure 1 , which is the third embodiment of the present invention. This embodiment is different from the second embodiment in that: the content of each component in the middle layer 3 by weight is as follows: 125 parts of ultrafine fibers, 80 parts of resin, 40 parts of polyurethane, 25 parts of dimethylformamide, 10 parts of butanone and 20 parts of breathable additives; the content of each component in the surface layer 4 by weight is as follows: 110 parts of fine fibers, 100 parts of polyurethane, 25 parts of dimethylformamide, 15 parts of butanone and 30 parts of breathable additives; the content of each component in the breathable additive by weight is as follows: 45 parts of modified polysiloxane, 25 parts of surfactant, 8 parts of cross-linking agent, 15 parts of stabilizer and 6 parts of leveling agent.

[0053] The remaining structure is the same as that of Example 2.

[0054] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A breathable microfiber leather, characterized in that: It comprises a microfiber leather body (1), wherein the microfiber leather body (1) is composed of a base layer (2), an intermediate layer (3) and a surface layer (4); The base layer (2) has excellent mechanical properties and durability; The intermediate layer (3) is used to enhance the performance of the material; The surface layer (4) has excellent wear resistance, tear resistance and elasticity.

2. The breathable microfiber leather according to claim 1, characterized in that: The base layer (2) is composed of ultra-fine fiber non-woven fabric and is used as the skeleton and support of the ultra-fine leather.

3. The breathable microfiber leather according to claim 2, characterized in that: The contents of the components in the intermediate layer (3) are as follows by weight: 100-125 parts of ultrafine fibers, 60-80 parts of resin, 20-40 parts of polyurethane, 15-25 parts of dimethylformamide, 5-10 parts of butanone and 10-20 parts of a breathable additive.

4. The breathable microfiber leather according to claim 3, characterized in that: The contents of the components in the surface layer (4) are as follows by weight: 80-110 parts of fine fibers, 80-100 parts of polyurethane, 10-25 parts of dimethylformamide, 7-15 parts of butanone and 20-30 parts of a breathable auxiliary agent.

5. The breathable microfiber leather according to claim 4, characterized in that: The air permeability aid consists of modified polysiloxane, a surfactant, a crosslinking agent, a stabilizer and a leveling agent.

6. The breathable microfiber leather according to claim 5, characterized in that: The contents of the components in the air permeability aid are as follows by weight: 30-45 parts of modified polysiloxane, 15-25 parts of surfactant, 5-8 parts of crosslinking agent, 7-15 parts of stabilizer and 3-6 parts of leveling agent.

7. A method for preparing a breathable microfiber leather, which is applied to the breathable microfiber leather described in claim 6, characterized in that: The following steps are included: S1, a base layer (2) is prepared by interweaving ultrafine fiber nonwoven fabrics by combing, needle punching, etc. to form a three-dimensional network structure; S2, preparing a breathable agent, first pre-mixing the modified polysiloxane, surfactant, cross-linking agent, stabilizer and leveling agent in a certain proportion to ensure uniform dispersion of the components, and then allowing the pre-mixed components to undergo a chemical reaction under the conditions of temperature, pressure and catalyst of 80-110 degrees, and then after the reaction is completed, filtering, washing, drying and other post-treatment operations are performed on the product to remove impurities, adjust the particle size and improve the purity, and finally form a breathable agent; S3, preparing the coating of the middle layer (3), first taking out the ultrafine fibers and the resin, adding the polyurethane and dimethylformamide, and then putting them into a stirring device for stirring and mixing, then adding butanone and the air permeability aid prepared in S2, and stirring them sufficiently to form the coating; S4, coating the coating prepared in S3 on the surface of the base layer (2) by means of a roller coating device, and then sending the coating into a heating device and heating it at 90-100 degrees so that a layer of the intermediate layer (3) is attached to the surface of the base layer (2); S5, preparing the surface layer (4) coating, first taking out the fine fibers and the polyurethane and mixing and stirring them, then adding dimethylformamide and continuing to stir and mix, then adding butanone and the air permeability aid prepared in S2, and stirring them sufficiently to form the coating; S6, finally, the coating prepared in S5 is coated on the surface of the intermediate layer (3) by a roller coating device, and then sent to a heating device for heating at 90-100 degrees so that a surface layer (4) is attached to the surface of the intermediate layer (3); S7, using a baking oven to bake the microfiber leather at high temperature to mature it, controlling the temperature to be maintained at 100-120° C., and then the microfiber leather is manufactured after it is cooled.

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