Environment-friendly biological synthetic leather

Abstract

The invention provides environment-friendly biological synthetic leather. The environment-friendly biological synthetic leather sequentially comprises base cloth, a bamboo fiber non-woven fabric and a surface coating from inside to outside, the surface coating is prepared from the following raw materials in parts by weight: 100 to 110 parts of polyurethane prepolymer, 1 to 2 parts of silane coupling agent, 4 to 6 parts of triethylamine, 150 to 160 parts of deionized water, 12 to 16 parts of modified montmorillonite, 0.5 to 1 part of defoaming agent, 0.5 to 0.7 part of dispersing agent and 1 to 1.2 parts of flatting agent. The biological synthetic leather disclosed by the invention has the appearance and hand feeling similar to those of genuine leather, has excellent mechanical properties, also has waterproof and air-permeable properties, and is long in service life; the method is relatively low in cost, is suitable for manufacturing various products such as leather shoes, leather bags and sofas, and has relatively high market competitiveness. The base cloth, the bamboo fiber non-woven fabric and the surface coating are used in a combined mode, components of all the layers are improved, and stable and efficient mass production is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of synthetic leather, in particular to environmentally friendly biosynthetic leather. Background Art

[0002] As global environmental awareness continues to increase, traditional leather products are gradually receiving more and more attention and restrictions due to the environmental pollution and resource consumption problems that may be caused during the production process. Environmentally friendly biosynthetic leather, as a new type of environmentally friendly material, has emerged and gradually become an important choice to replace traditional leather.

[0003] Environmentally friendly biosynthetic leather is a new type of synthetic material made from natural raw materials through chemical synthesis. It achieves clean production and environmentally friendly processing in the production process, and the finished product is biodegradable. This material not only has the advantages of leather appearance, texture, breathability and service life, but also has lower cost and environmentally friendly production process. It is an environmentally friendly substitute for leather.

[0004] Environmentally friendly biosynthetic leather has been widely used in the fields of automobile interior, furniture sofa, clothing and footwear due to its environmental protection, durability and beautiful appearance. Especially in the field of automobile interior, environmentally friendly biosynthetic leather has become the first choice of consumers due to its good breathability and comfort. In addition, as consumers' awareness of environmental protection increases, environmentally friendly biosynthetic leather is also increasingly widely used in the field of clothing and footwear.

[0005] Although environmentally friendly biosynthetic leather has many advantages, there are still some technical problems in the actual application process. For example, its waterproof performance is often difficult to reach the long-term stability standard, and it is easy to seep water in a humid environment, affecting the durability of the product and user experience. At the same time, the lack of air permeability also limits the application of synthetic leather in situations that require good air circulation, such as long-term wear or contact, which can easily cause discomfort and sweat accumulation, reducing the comfort and health of the product. These problems mainly come from the fact that in the manufacturing process of synthetic leather, the balance between the waterproof layer and the breathable layer is difficult to accurately control, and the material itself has limitations on moisture and air permeability. Based on this, the present invention provides an environmentally friendly biosynthetic leather. Summary of the invention

[0006] The purpose of the invention is to provide an environmentally friendly biosynthetic leather, which improves the mechanical properties of the synthetic leather and has both waterproof and breathable properties.

[0007] On the one hand, the present invention provides an environmentally friendly biosynthetic leather, which includes, from the inside to the outside, a base cloth bonded with an adhesive, a bamboo fiber non-woven fabric and a surface coating; the surface coating includes the following raw materials in parts by weight: 100-110 parts of a polyurethane prepolymer, 1-2 parts of a silane coupling agent, 4-6 parts of triethylamine, 150-160 parts of deionized water, 12-16 parts of modified montmorillonite, 0.5-1 parts of a defoaming agent, 0.5-0.7 parts of a dispersant, and 1-1.2 parts of a leveling agent.

[0008] Furthermore, the base fabric is a cotton and linen knitted fabric, and the bamboo fiber content of the bamboo fiber non-woven fabric is 100%.

[0009] Furthermore, the adhesive is a polyacrylate adhesive.

[0010] Furthermore, the preparation method of the polyurethane prepolymer includes: vacuum dehydrating trihydroxy polyoxypropylene ether, adding modified zeolite under stirring conditions at a speed of 300-400 r / min, then ultrasonically dispersing for 30-40 minutes, and finally adding toluene-2,4-diisocyanate and reacting at 65-75°C for 4-5 hours to obtain the prepolymer.

[0011] Furthermore, the vacuum dehydration is carried out at a temperature of 100-110° C. and for a time of 70-80 min.

[0012] Furthermore, the weight ratio of the trihydroxy polyoxypropylene ether, the modified zeolite and toluene-2,4-diisocyanate is (15-17): (3-4): (20-22).

[0013] Furthermore, the preparation method of the modified zeolite comprises: firstly washing the zeolite with deionized water, drying at a temperature of 80-90°C for 60-80min, mixing an acetic acid aqueous solution with a volume ratio of (2-3):(6-8) and a volume fraction of 5-6% and a chitosan aqueous solution of 10-12g / L, adding the zeolite and shaking at room temperature and 150-160r / min for 6-8h, washing to neutrality, and drying and grinding to obtain the modified zeolite.

[0014] Furthermore, the preparation method of the modified montmorillonite comprises: adding an excess of hexadecyltrimethylammonium bromide aqueous solution to a sodium montmorillonite aqueous solution with a mass concentration of 5-7% at 80-90° C., stirring for 2-3 hours, filtering, and washing with deionized water until there is no Br － , vacuum dried and ground, and passed through a 200-mesh sieve.

[0015] Furthermore, the preparation method of the surface coating comprises: mixing and dispersing triethylamine and aminosilane coupling agent in deionized water at 5° C., adding prepolymer and shearing and emulsifying for 30-40 minutes, adding defoaming agent and dispersing evenly to obtain an aqueous polyurethane emulsion with a solid content of 32-35% and aminosilane coupling agent chain extension, adding modified montmorillonite and dispersant to the polyurethane emulsion and dispersing for 10-20 minutes, then adding emulsifying agent and leveling agent and continuing to disperse for 20-30 minutes to obtain the coating.

[0016] On the other hand, the present invention provides a method for preparing an environmentally friendly biosynthetic leather, the steps comprising: coating adhesive on both sides of a base fabric and then covering them with bamboo fiber non-woven fabric, continuing to coat adhesive on the outer layer of the bamboo fiber non-woven fabric on one side, using a coating machine to coat the surface coating on the outer surface of the bamboo fiber non-woven fabric and curing it at 30-34°C for 25-30 minutes, the speed of the coating machine is 5-6m / min, and then repeating the above operation on the bamboo fiber on the other side, followed by washing and drying.

[0017] The beneficial effects of the present invention are:

[0018] (1) The present invention uses cotton and linen knitted fabric as the base fabric. This material has good moisture absorption and air permeability, and also has a certain strength, which provides basic support for synthetic leather. In addition, the use of 100% bamboo fiber non-woven fabric not only increases the environmental friendliness of synthetic leather, but also improves the health performance of the product due to its natural antibacterial and anti-mite properties. Bamboo fiber itself has good strength and toughness, which helps to enhance the overall mechanical properties of synthetic leather;

[0019] (2) When preparing the polyurethane prepolymer, the present invention uses vacuum dehydration to remove the water in the trihydroxy polyoxypropylene ether, avoids side reactions in subsequent reactions, and improves the purity of the prepolymer; adds modified zeolite for ultrasonic dispersion, enhances the interaction between the zeolite and the polyurethane prepolymer, and improves the dispersibility and stability of the prepolymer; adds toluene-2,4-diisocyanate, reacts with the trihydroxy polyoxypropylene ether, and forms a polyurethane prepolymer, which has good reactivity and film-forming properties;

[0020] (3) In the preparation process of the modified zeolite and modified montmorillonite of the present invention, the compatibility of the inorganic filler and the polyurethane prepolymer is enhanced by introducing organic functional groups, thereby improving the dispersibility and stability of the coating; in the preparation of the modified zeolite, the mixture of the acetic acid aqueous solution and the chitosan aqueous solution introduces organic functional groups to the surface of the zeolite, thereby enhancing its hydrophilicity and dispersibility; in the preparation of the modified montmorillonite, the addition of hexadecyltrimethylammonium bromide makes the surface of the montmorillonite carry a positive charge, thereby enhancing its interaction with the polyurethane prepolymer;

[0021] (4) The chitosan used in the raw material of the present invention is a natural polysaccharide with excellent biocompatibility and biological activity. It also contains free amino groups and can combine with acid molecules. It is the only alkaline polysaccharide among natural polysaccharides. These characteristics of chitosan make it an ideal modifier. Modified zeolite can be obtained by reacting chitosan with zeolite. The amino groups and other functional groups on the surface of the modified zeolite can react with the isocyanate groups in the polyurethane prepolymer to form chemical bonds, thereby enhancing the intermolecular forces of the polyurethane prepolymer and improving its mechanical properties. The addition of modified zeolite can also improve the dispersibility and stability of the polyurethane prepolymer, making it more evenly distributed in the coating, which is conducive to forming a continuous and dense coating, thereby improving the waterproof performance of the synthetic leather.

[0022] (5) The modified montmorillonite of the present invention converts the hydrophilicity of the montmorillonite surface into lipophilicity, thereby being more compatible with the polyurethane coating and improving the dispersibility and stability of the coating; the lamellar structure of the organically modified montmorillonite plays a role of "micro-nano enhancement" in the coating, which can significantly improve the mechanical properties and wear resistance of the coating; at the same time, the lamellar structure of the montmorillonite can also form a "maze effect" to hinder the penetration of water molecules, thereby improving the waterproof performance of the synthetic leather;

[0023] (6) The synthetic leather of the present invention can achieve a breathable effect on the basis of the aforementioned waterproof performance; this is because the chitosan-modified zeolite and the organic-modified montmorillonite work together in the coating. While the chitosan-modified zeolite and the modified sodium-based montmorillonite can both achieve a waterproof effect, the organic-modified montmorillonite can also form microporous channels through its lamellar structure to achieve a breathable function;

[0024] (7) The comparative examples of the present invention further show that it is not only the chitosan-modified zeolite and the organically modified montmorillonite that work together to improve the performance of the synthetic leather. In the preparation process of the surface coating of the present invention, the chitosan-modified zeolite is used to prepare the polyurethane prepolymer, and the modified sodium-based montmorillonite is added to the raw materials of the surface coating. This method can maximize the performance of the synthetic leather. DETAILED DESCRIPTION

[0025] The technical scheme of the present invention is described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. Raw materials not specified in the following embodiments are all commercially available.

[0026] Example 1

[0027] The present embodiment provides an environmentally friendly biosynthetic leather, which includes, from the inside to the outside, a base fabric, a bamboo fiber non-woven fabric and a surface coating bonded by an adhesive; the base fabric is a cotton and linen knitted fabric, and the bamboo fiber non-woven fabric has a bamboo fiber content of 100%; the adhesive is a polyacrylate adhesive HENKEL Loctite H5004; the base fabric has a thickness of 1 mm, the bamboo fiber non-woven fabric has a thickness of 0.5 mm, and the adhesive has a thickness of 20 μm

[0028] The surface coating comprises the following raw materials in parts by weight: 105 parts of polyurethane prepolymer, 1.5 parts of silane coupling agent KH-560, 5 parts of triethylamine, 155 parts of deionized water, 14 parts of modified montmorillonite, 0.75 parts of defoaming agent BYK-141, 0.6 parts of dispersant EfkaPU 4010, and 1.1 parts of leveling agent KMT-5510S;

[0029] The preparation method of the polyurethane prepolymer comprises: vacuum dehydrating trihydroxy polyoxypropylene ether at a temperature of 105° C. for 75 minutes, adding modified zeolite under stirring at a speed of 350 r / min, then ultrasonically dispersing for 35 minutes, and finally adding toluene-2,4-diisocyanate and reacting at 70° C. for 4.5 hours to obtain the prepolymer; the weight ratio of trihydroxy polyoxypropylene ether, modified zeolite and toluene-2,4-diisocyanate is 16:3.5:21;

[0030] The preparation method of the modified zeolite comprises: firstly, washing the zeolite with deionized water, drying at a temperature of 85°C for 70 minutes, mixing an acetic acid aqueous solution with a volume fraction of 5.5% and a chitosan aqueous solution with a volume ratio of 2.5:7, adding zeolite with a mass fraction of 13% relative to the mixed solution, shaking at room temperature and 155r / min for 7 hours, washing to neutrality, drying and grinding to obtain the modified zeolite;

[0031] The preparation method of modified montmorillonite comprises: adding an excess of hexadecyltrimethylammonium bromide aqueous solution to a sodium montmorillonite aqueous solution with a mass concentration of 6% at 85°C, stirring for 2.5 hours, filtering, and washing with deionized water until there is no Br － , vacuum dried and ground, and passed through a 200-mesh sieve;

[0032] The preparation method of the surface coating comprises: mixing triethylamine and aminosilane coupling agent KH550 and dispersing them in deionized water at 5°C, adding prepolymer and then shearing and emulsifying for 35 minutes, adding defoamer and dispersing evenly to obtain an aqueous polyurethane emulsion with a solid content of 33.5% and an aminosilane coupling agent KH550 chain extension, adding modified montmorillonite and a dispersant to the polyurethane emulsion and dispersing them for 15 minutes at a stirring speed of 300 r / min, then adding an emulsifying agent and a leveling agent and continuing to disperse them for 25 minutes to obtain the surface coating;

[0033] In this embodiment, a method for preparing an environmentally friendly biosynthetic leather comprises the following steps: coating both sides of a base fabric with adhesive and then covering them with bamboo fiber non-woven fabric, continuing to coat the outer layer of the bamboo fiber non-woven fabric on one side with adhesive, coating the outer surface of the bamboo fiber non-woven fabric with a coating machine and curing it at 32°C for 27.5 minutes, the coating machine having a speed of 5.5 m / min, and then repeating the above operation on the bamboo fiber on the other side, followed by washing and drying, and the final single-side coating thickness is 0.5 mm.

[0034] Example 2

[0035] The present embodiment provides an environmentally friendly biosynthetic leather, which includes, from the inside to the outside, a base fabric, a bamboo fiber non-woven fabric and a surface coating bonded by an adhesive; the base fabric is a cotton and linen knitted fabric, and the bamboo fiber non-woven fabric has a bamboo fiber content of 100%; the adhesive is a polyacrylate adhesive HENKEL Loctite H5004; the base fabric has a thickness of 1 mm, the bamboo fiber non-woven fabric has a thickness of 0.5 mm, and the adhesive has a thickness of 20 μm

[0036] The surface coating comprises the following raw materials in parts by weight: 110 parts of polyurethane prepolymer, 2 parts of silane coupling agent KH-560, 6 parts of triethylamine, 160 parts of deionized water, 16 parts of modified montmorillonite, 1 part of defoamer BYK-141, 0.7 parts of dispersant Efka PU4010, and 1.2 parts of leveling agent KMT-5510S;

[0037] The preparation method of the polyurethane prepolymer comprises: vacuum dehydrating trihydroxy polyoxypropylene ether at a temperature of 110° C. for 80 minutes, adding modified zeolite under stirring at a speed of 400 r / min, then ultrasonically dispersing for 40 minutes, and finally adding toluene-2,4-diisocyanate and reacting at 75° C. for 5 hours to obtain the prepolymer; the weight ratio of trihydroxy polyoxypropylene ether, modified zeolite and toluene-2,4-diisocyanate is 17:3:20;

[0038] The preparation method of the modified zeolite comprises: firstly, washing the zeolite with deionized water, drying at a temperature of 90°C for 80 minutes, mixing a 6% acetic acid aqueous solution and a 12g / L chitosan aqueous solution in a volume ratio of 3:8, adding 14% zeolite with respect to the mixed solution by mass, shaking at room temperature and 160r / min for 8 hours, washing to neutrality, drying and grinding to obtain the modified zeolite;

[0039] The preparation method of modified montmorillonite comprises: adding an excess of hexadecyltrimethylammonium bromide aqueous solution to a 7% sodium montmorillonite aqueous solution at 90°C, stirring for 3 hours, filtering, and washing with deionized water until there is no Br － , vacuum dried and ground, and passed through a 200-mesh sieve;

[0040] The preparation method of the surface coating comprises: mixing triethylamine and aminosilane coupling agent KH550 and dispersing them in deionized water at 5°C, adding prepolymer and then shearing and emulsifying for 40 minutes, adding defoamer and dispersing evenly to obtain a waterborne polyurethane emulsion with a solid content of 35% and an aminosilane coupling agent KH550 chain extension, adding modified montmorillonite and dispersant to the polyurethane emulsion and dispersing them for 20 minutes at a stirring speed of 300 r / min, then adding emulsifying agent and leveling agent and continuing to disperse them for 30 minutes to obtain the surface coating;

[0041] In this embodiment, a method for preparing an environmentally friendly biosynthetic leather comprises the following steps: coating both sides of a base fabric with adhesive and then covering them with bamboo fiber non-woven fabric, continuing to coat the outer layer of the bamboo fiber non-woven fabric on one side with adhesive, coating the outer surface of the bamboo fiber non-woven fabric with a coating machine and curing it at 34°C for 30 minutes, the coating machine speed is 6m / min, and then the bamboo fiber on the other side is repeated, followed by washing and drying, and the final single-side coating thickness is 0.6mm.

[0042] Example 3

[0043] The present embodiment provides an environmentally friendly biosynthetic leather, which includes, from the inside to the outside, a base fabric, a bamboo fiber non-woven fabric and a surface coating bonded by an adhesive; the base fabric is a cotton and linen knitted fabric, and the bamboo fiber non-woven fabric has a bamboo fiber content of 100%; the adhesive is a polyacrylate adhesive HENKEL Loctite H5004; the base fabric has a thickness of 1 mm, the bamboo fiber non-woven fabric has a thickness of 0.5 mm, and the adhesive has a thickness of 20 μm

[0044] The surface coating comprises the following raw materials in parts by weight: 100 parts of polyurethane prepolymer, 1 part of silane coupling agent KH-560, 4 parts of triethylamine, 150 parts of deionized water, 12 parts of modified montmorillonite, 0.5 parts of defoaming agent BYK-141, 0.5 parts of dispersant EfkaPU 4010, and 1 part of leveling agent KMT-5510S;

[0045] The preparation method of the polyurethane prepolymer comprises: vacuum dehydrating trihydroxy polyoxypropylene ether at a temperature of 100° C. for 70 minutes, adding modified zeolite under stirring at a speed of 300 r / min, then ultrasonically dispersing for 30 minutes, and finally adding toluene-2,4-diisocyanate and reacting at 65° C. for 4 hours to obtain the prepolymer; the weight ratio of trihydroxy polyoxypropylene ether, modified zeolite and toluene-2,4-diisocyanate is 15:3:20;

[0046] The preparation method of the modified zeolite comprises: firstly, washing the zeolite with deionized water, drying at a temperature of 80°C for 60 minutes, mixing a 5% acetic acid aqueous solution and a 10g / L chitosan aqueous solution in a volume ratio of 2:6, adding 12% zeolite with respect to the mixed solution by mass, shaking at room temperature and 150r / min for 6 hours, washing to neutrality, drying and grinding to obtain the modified zeolite;

[0047] The preparation method of modified montmorillonite comprises: adding an excess of hexadecyltrimethylammonium bromide aqueous solution to a 5% sodium montmorillonite aqueous solution at 80°C, stirring for 2 hours, filtering, and washing with deionized water until there is no Br － , vacuum dried and ground, and passed through a 200-mesh sieve;

[0048] The preparation method of the surface coating comprises: mixing triethylamine and aminosilane coupling agent KH550 and dispersing them in deionized water at 5°C, adding prepolymer and then shearing and emulsifying for 30 minutes, adding defoamer and dispersing evenly to obtain an aqueous polyurethane emulsion with a solid content of 32% and an aminosilane coupling agent KH550 chain extension, adding modified montmorillonite and dispersant to the polyurethane emulsion and dispersing them for 10 minutes under a stirring condition of a rotation speed of 300 r / min, then adding an emulsifying agent and a leveling agent and continuing to disperse them for 20 minutes to obtain the surface coating;

[0049] In this embodiment, a method for preparing an environmentally friendly biosynthetic leather comprises the following steps: coating both sides of a base fabric with adhesive and then covering them with bamboo fiber non-woven fabric, continuing to coat the outer layer of the bamboo fiber non-woven fabric on one side with adhesive, coating the outer surface of the bamboo fiber non-woven fabric with a coating machine and curing it at 30°C for 25 minutes, the coating machine speed is 5m / min, and then the bamboo fiber on the other side is repeated, and then washed and dried, and the final single-side coating thickness is 0.4mm.

[0050] Example 4

[0051] The present embodiment provides an environmentally friendly biosynthetic leather, which includes, from the inside to the outside, a base fabric, a bamboo fiber non-woven fabric and a surface coating bonded by an adhesive; the base fabric is a cotton and linen knitted fabric, and the bamboo fiber non-woven fabric has a bamboo fiber content of 100%; the adhesive is a polyacrylate adhesive HENKEL Loctite H5004; the base fabric has a thickness of 1 mm, the bamboo fiber non-woven fabric has a thickness of 0.5 mm, and the adhesive has a thickness of 20 μm

[0052] The surface coating comprises the following raw materials in parts by weight: 100 parts of polyurethane prepolymer, 2 parts of silane coupling agent KH-560, 4 parts of triethylamine, 160 parts of deionized water, 12 parts of modified montmorillonite, 1 part of defoamer BYK-141, 0.5 parts of dispersant Efka PU4010, and 1.2 parts of leveling agent KMT-5510S;

[0053] The preparation method of the polyurethane prepolymer comprises: vacuum dehydrating trihydroxy polyoxypropylene ether at a temperature of 100° C. for 80 minutes, adding modified zeolite under stirring at a speed of 300 r / min, then ultrasonically dispersing for 40 minutes, and finally adding toluene-2,4-diisocyanate and reacting at 65° C. for 5 hours to obtain the prepolymer; the weight ratio of trihydroxy polyoxypropylene ether, modified zeolite and toluene-2,4-diisocyanate is 17:3:22;

[0054] The preparation method of the modified zeolite comprises: firstly, washing the zeolite with deionized water, drying at a temperature of 80°C for 80 minutes, mixing an acetic acid aqueous solution with a volume fraction of 6% and a chitosan aqueous solution with a volume ratio of 2:8, adding zeolite with a mass fraction of 14% relative to the mixed solution, shaking at room temperature and 150r / min for 8 hours, washing to neutrality, drying and grinding to obtain the modified zeolite;

[0055] The preparation method of modified montmorillonite comprises: adding an excess of hexadecyltrimethylammonium bromide aqueous solution to a 5% sodium montmorillonite aqueous solution at 90°C, stirring for 2 hours, filtering, and washing with deionized water until there is no Br － , vacuum dried and ground, and passed through a 200-mesh sieve;

[0056] The preparation method of the surface coating comprises: mixing triethylamine and aminosilane coupling agent KH550 and dispersing them in deionized water at 5°C, adding prepolymer and then shearing and emulsifying for 40 minutes, adding defoamer and dispersing evenly to obtain an aqueous polyurethane emulsion with a solid content of 32% and an aminosilane coupling agent KH550 chain extension, adding modified montmorillonite and dispersant to the polyurethane emulsion and dispersing them for 20 minutes under stirring conditions at a speed of 300 r / min, then adding emulsifying aid and leveling agent and continuing to disperse for 20 minutes to obtain the surface coating;

[0057] In this embodiment, a method for preparing an environmentally friendly biosynthetic leather comprises the following steps: coating both sides of a base fabric with adhesive and then covering them with bamboo fiber non-woven fabric, continuing to coat the outer layer of the bamboo fiber non-woven fabric on one side with adhesive, coating the outer surface of the bamboo fiber non-woven fabric with a coating machine and curing it at 34°C for 25 minutes, the coating machine speed is 6m / min, and then the bamboo fiber on the other side is repeated, followed by washing and drying, and the final single-side coating thickness is 0.5mm.

[0058] Comparative Example 1

[0059] The comparative example provides an environmentally friendly biosynthetic leather, which includes, from the inside to the outside, a base fabric, a bamboo fiber non-woven fabric and a surface coating bonded by an adhesive; the base fabric is a cotton and linen knitted fabric, and the bamboo fiber non-woven fabric has a bamboo fiber content of 100%; the adhesive is a polyacrylate adhesive HENKEL Loctite H5004; the base fabric has a thickness of 1 mm, the bamboo fiber non-woven fabric has a thickness of 0.5 mm, and the adhesive has a thickness of 20 μm

[0060] The surface coating comprises the following raw materials in parts by weight: 105 parts of polyurethane prepolymer, 1.5 parts of silane coupling agent KH-560, 5 parts of triethylamine, 155 parts of deionized water, 14 parts of modified montmorillonite, 0.75 parts of defoaming agent BYK-141, 0.6 parts of dispersant EfkaPU 4010, and 1.1 parts of leveling agent KMT-5510S;

[0061] The preparation method of the polyurethane prepolymer comprises: vacuum dehydrating trihydroxy polyoxypropylene ether at a temperature of 105° C. for 75 minutes, adding zeolite under stirring at a speed of 350 r / min, then ultrasonically dispersing for 35 minutes, and finally adding toluene-2,4-diisocyanate and reacting at 70° C. for 4.5 hours to obtain the prepolymer; the weight ratio of trihydroxy polyoxypropylene ether, zeolite and toluene-2,4-diisocyanate is 16:3.5:21;

[0062] The preparation method of modified montmorillonite comprises: adding an excess of hexadecyltrimethylammonium bromide aqueous solution to a sodium montmorillonite aqueous solution with a mass concentration of 6% at 85°C, stirring for 2.5 hours, filtering, and washing with deionized water until there is no Br － , vacuum dried and ground, and passed through a 200-mesh sieve;

[0063] The preparation method of the surface coating comprises: mixing triethylamine and aminosilane coupling agent KH550 and dispersing them in deionized water at 5°C, adding prepolymer and then shearing and emulsifying for 35 minutes, adding defoamer and dispersing evenly to obtain an aqueous polyurethane emulsion with a solid content of 33.5% and an aminosilane coupling agent KH550 chain extension, adding modified montmorillonite and a dispersant to the polyurethane emulsion and dispersing them for 15 minutes at a stirring speed of 300 r / min, then adding an emulsifying agent and a leveling agent and continuing to disperse them for 25 minutes to obtain the surface coating;

[0064] In this embodiment, a method for preparing an environmentally friendly biosynthetic leather comprises the following steps: coating both sides of a base fabric with adhesive and then covering them with bamboo fiber non-woven fabric, continuing to coat the outer layer of the bamboo fiber non-woven fabric on one side with adhesive, coating the outer surface of the bamboo fiber non-woven fabric with a coating machine and curing it at 32°C for 27.5 minutes, the coating machine having a speed of 5.5 m / min, and then repeating the above operation on the bamboo fiber on the other side, followed by washing and drying, and the final single-side coating thickness is 0.5 mm.

[0065] Comparative Example 2

[0066] The comparative example provides an environmentally friendly biosynthetic leather, which includes, from the inside to the outside, a base fabric, a bamboo fiber non-woven fabric and a surface coating bonded by an adhesive; the base fabric is a cotton and linen knitted fabric, and the bamboo fiber non-woven fabric has a bamboo fiber content of 100%; the adhesive is a polyacrylate adhesive HENKELLoctite H5004; the base fabric has a thickness of 1 mm, the bamboo fiber non-woven fabric has a thickness of 0.5 mm, and the adhesive has a thickness of 20 μm

[0067] The surface coating comprises the following raw materials in parts by weight: 105 parts of polyurethane prepolymer, 1.5 parts of silane coupling agent KH-560, 5 parts of triethylamine, 155 parts of deionized water, 14 parts of modified montmorillonite, 0.75 parts of defoaming agent BYK-141, 0.6 parts of dispersant EfkaPU 4010, and 1.1 parts of leveling agent KMT-5510S;

[0068] The preparation method of the polyurethane prepolymer comprises: vacuum dehydrating trihydroxy polyoxypropylene ether at a temperature of 105°C for 75 minutes, ultrasonically dispersing for 35 minutes, adding toluene-2,4-diisocyanate and reacting at 70°C for 4.5 hours to obtain the prepolymer; the weight ratio of trihydroxy polyoxypropylene ether to toluene-2,4-diisocyanate is 16:3.5:21;

[0069] The preparation method of modified montmorillonite comprises: adding an excess of hexadecyltrimethylammonium bromide aqueous solution to a sodium montmorillonite aqueous solution with a mass concentration of 6% at 85°C, stirring for 2.5 hours, filtering, and washing with deionized water until there is no Br － , vacuum dried and ground, and passed through a 200-mesh sieve;

[0070] The preparation method of the surface coating comprises: mixing triethylamine and aminosilane coupling agent KH550 and dispersing them in deionized water at 5°C, adding prepolymer and then shearing and emulsifying for 35 minutes, adding defoamer and dispersing evenly to obtain an aqueous polyurethane emulsion with a solid content of 33.5% and an aminosilane coupling agent KH550 chain extension, adding modified montmorillonite and a dispersant to the polyurethane emulsion and dispersing them for 15 minutes at a stirring speed of 300 r / min, then adding an emulsifying agent and a leveling agent and continuing to disperse them for 25 minutes to obtain the surface coating;

[0071] In this embodiment, a method for preparing an environmentally friendly biosynthetic leather comprises the following steps: coating both sides of a base fabric with adhesive and then covering them with bamboo fiber non-woven fabric, continuing to coat the outer layer of the bamboo fiber non-woven fabric on one side with adhesive, coating the outer surface of the bamboo fiber non-woven fabric with a coating machine and curing it at 32°C for 27.5 minutes, the coating machine having a speed of 5.5 m / min, and then repeating the above operation on the bamboo fiber on the other side, followed by washing and drying, and the final single-side coating thickness is 0.5 mm.

[0072] Comparative Example 3

[0073] The comparative example provides an environmentally friendly biosynthetic leather, which includes, from the inside to the outside, a base fabric, a bamboo fiber non-woven fabric and a surface coating bonded by an adhesive; the base fabric is a cotton and linen knitted fabric, and the bamboo fiber non-woven fabric has a bamboo fiber content of 100%; the adhesive is a polyacrylate adhesive HENKEL Loctite H5004; the base fabric has a thickness of 1 mm, the bamboo fiber non-woven fabric has a thickness of 0.5 mm, and the adhesive has a thickness of 20 μm

[0074] The surface coating comprises the following raw materials in parts by weight: 105 parts of polyurethane prepolymer, 1.5 parts of silane coupling agent KH-560, 5 parts of triethylamine, 155 parts of deionized water, 14 parts of modified montmorillonite, 0.75 parts of defoaming agent BYK-141, 0.6 parts of dispersant EfkaPU 4010, and 1.1 parts of leveling agent KMT-5510S;

[0075] The preparation method of the polyurethane prepolymer comprises: vacuum dehydrating trihydroxy polyoxypropylene ether at a temperature of 105°C for 75 minutes, adding chitosan-modified sodium montmorillonite under stirring at a speed of 350 r / min, then ultrasonically dispersing for 35 minutes, and finally adding toluene-2,4-diisocyanate and reacting at 70°C for 4.5 hours to obtain the prepolymer; the weight ratio of trihydroxy polyoxypropylene ether, modified zeolite and toluene-2,4-diisocyanate is 16:3.5:21;

[0076] The preparation method of chitosan-modified sodium montmorillonite comprises: firstly, washing the sodium montmorillonite with deionized water, drying at 85°C for 70 minutes, mixing an acetic acid aqueous solution with a volume ratio of 2.5:7 and a volume fraction of 5.5% and a chitosan aqueous solution with a volume fraction of 11g / L, adding sodium montmorillonite with a mass fraction of 13% relative to the mixed solution, shaking at room temperature and 155r / min for 7 hours, washing to neutrality, drying and grinding to obtain the obtained product;

[0077] The preparation method of modified montmorillonite comprises: adding an excess of hexadecyltrimethylammonium bromide aqueous solution to a sodium montmorillonite aqueous solution with a mass concentration of 6% at 85°C, stirring for 2.5 hours, filtering, and washing with deionized water until there is no Br －, vacuum dried and ground, and passed through a 200-mesh sieve;

[0078] The preparation method of the surface coating comprises: mixing triethylamine and aminosilane coupling agent KH550 and dispersing them in deionized water at 5°C, adding prepolymer and then shearing and emulsifying for 35 minutes, adding defoamer and dispersing evenly to obtain an aqueous polyurethane emulsion with a solid content of 33.5% and an aminosilane coupling agent KH550 chain extension, adding modified montmorillonite and a dispersant to the polyurethane emulsion and dispersing them for 15 minutes at a stirring speed of 300 r / min, then adding an emulsifying agent and a leveling agent and continuing to disperse them for 25 minutes to obtain the surface coating;

[0079] In this embodiment, a method for preparing an environmentally friendly biosynthetic leather comprises the following steps: coating both sides of a base fabric with adhesive and then covering them with bamboo fiber non-woven fabric, continuing to coat the outer layer of the bamboo fiber non-woven fabric on one side with adhesive, coating the outer surface of the bamboo fiber non-woven fabric with a coating machine and curing it at 32°C for 27.5 minutes, the coating machine having a speed of 5.5 m / min, and then repeating the above operation on the bamboo fiber on the other side, followed by washing and drying, and the final single-side coating thickness is 0.5 mm.

[0080] Comparative Example 4

[0081] The comparative example provides an environmentally friendly biosynthetic leather, which includes, from the inside to the outside, a base fabric, a bamboo fiber non-woven fabric and a surface coating bonded by an adhesive; the base fabric is a cotton and linen knitted fabric, and the bamboo fiber non-woven fabric has a bamboo fiber content of 100%; the adhesive is a polyacrylate adhesive HENKEL Loctite H5004; the base fabric has a thickness of 1 mm, the bamboo fiber non-woven fabric has a thickness of 0.5 mm, and the adhesive has a thickness of 20 μm

[0082] The surface coating comprises the following raw materials in parts by weight: 105 parts of polyurethane prepolymer, 1.5 parts of silane coupling agent KH-560, 5 parts of triethylamine, 155 parts of deionized water, 14 parts of modified montmorillonite, 0.75 parts of defoaming agent BYK-141, 0.6 parts of dispersant EfkaPU 4010, and 1.1 parts of leveling agent KMT-5510S;

[0083] The preparation method of the polyurethane prepolymer comprises: vacuum dehydrating trihydroxy polyoxypropylene ether at a temperature of 105°C for 75 minutes, adding modified montmorillonite under stirring at a speed of 350r / min, then ultrasonically dispersing for 35 minutes, and finally adding toluene-2,4-diisocyanate and reacting at 70°C for 4.5 hours to obtain the prepolymer; the weight ratio of trihydroxy polyoxypropylene ether, modified montmorillonite and toluene-2,4-diisocyanate is 16:3.5:21;

[0084] The preparation method of modified montmorillonite comprises: adding an excess of hexadecyltrimethylammonium bromide aqueous solution to a sodium montmorillonite aqueous solution with a mass concentration of 6% at 85°C, stirring for 2.5 hours, filtering, and washing with deionized water until there is no Br － , vacuum dried and ground, and passed through a 200-mesh sieve;

[0085] The preparation method of the surface coating comprises: mixing triethylamine and aminosilane coupling agent KH550 and dispersing them in deionized water at 5°C, adding prepolymer and then shearing and emulsifying for 35 minutes, adding defoamer and dispersing evenly to obtain an aqueous polyurethane emulsion with a solid content of 33.5% and an aminosilane coupling agent KH550 chain extension, adding modified montmorillonite and a dispersant to the polyurethane emulsion and dispersing them for 15 minutes at a stirring speed of 300 r / min, then adding an emulsifying agent and a leveling agent and continuing to disperse them for 25 minutes to obtain the surface coating;

[0086] In this embodiment, a method for preparing an environmentally friendly biosynthetic leather comprises the following steps: coating both sides of a base fabric with adhesive and then covering them with bamboo fiber non-woven fabric, continuing to coat the outer layer of the bamboo fiber non-woven fabric on one side with adhesive, coating the outer surface of the bamboo fiber non-woven fabric with a coating machine and curing it at 32°C for 27.5 minutes, the coating machine having a speed of 5.5 m / min, and then repeating the above operation on the bamboo fiber on the other side, followed by washing and drying, and the final single-side coating thickness is 0.5 mm.

[0087] Comparative Example 5

[0088] The comparative example provides an environmentally friendly biosynthetic leather, which includes, from the inside to the outside, a base fabric, a bamboo fiber non-woven fabric and a surface coating bonded by an adhesive; the base fabric is a cotton and linen knitted fabric, and the bamboo fiber non-woven fabric has a bamboo fiber content of 100%; the adhesive is a polyacrylate adhesive HENKEL Loctite H5004; the base fabric has a thickness of 1 mm, the bamboo fiber non-woven fabric has a thickness of 0.5 mm, and the adhesive has a thickness of 20 μm

[0089] The surface coating comprises the following raw materials in parts by weight: 105 parts of polyurethane prepolymer, 1.5 parts of silane coupling agent KH-560, 5 parts of triethylamine, 155 parts of deionized water, 14 parts of montmorillonite, 0.75 parts of defoaming agent BYK-141, 0.6 parts of dispersant Efka PU4010, and 1.1 parts of leveling agent KMT-5510S;

[0090] The preparation method of the polyurethane prepolymer comprises: vacuum dehydrating trihydroxy polyoxypropylene ether at a temperature of 105° C. for 75 minutes, adding modified zeolite under stirring at a speed of 350 r / min, then ultrasonically dispersing for 35 minutes, and finally adding toluene-2,4-diisocyanate and reacting at 70° C. for 4.5 hours to obtain the prepolymer; the weight ratio of trihydroxy polyoxypropylene ether, modified zeolite and toluene-2,4-diisocyanate is 16:3.5:21;

[0091] The preparation method of the modified zeolite comprises: firstly, washing the zeolite with deionized water, drying at a temperature of 85°C for 70 minutes, mixing an acetic acid aqueous solution with a volume fraction of 5.5% and a chitosan aqueous solution with a volume ratio of 2.5:7, adding zeolite with a mass fraction of 13% relative to the mixed solution, shaking at room temperature and 155r / min for 7 hours, washing to neutrality, drying and grinding to obtain the modified zeolite;

[0092] The preparation method of the surface coating comprises: mixing triethylamine and aminosilane coupling agent KH550 and dispersing them in deionized water at 5°C, adding prepolymer and then shearing and emulsifying for 35 minutes, adding defoamer and dispersing evenly to obtain an aqueous polyurethane emulsion with a solid content of 33.5% and an aminosilane coupling agent KH550 chain extension, adding modified montmorillonite and a dispersant to the polyurethane emulsion and dispersing them for 15 minutes at a stirring speed of 300 r / min, then adding an emulsifying agent and a leveling agent and continuing to disperse them for 25 minutes to obtain the surface coating;

[0093] In this embodiment, a method for preparing an environmentally friendly biosynthetic leather comprises the following steps: coating both sides of a base fabric with adhesive and then covering them with bamboo fiber non-woven fabric, continuing to coat the outer layer of the bamboo fiber non-woven fabric on one side with adhesive, coating the outer surface of the bamboo fiber non-woven fabric with a coating machine and curing it at 32°C for 27.5 minutes, the coating machine having a speed of 5.5 m / min, and then repeating the above operation on the bamboo fiber on the other side, followed by washing and drying, and the final single-side coating thickness is 0.5 mm.

[0094] Comparative Example 6

[0095] The comparative example provides an environmentally friendly biosynthetic leather, which includes, from the inside to the outside, a base fabric, a bamboo fiber non-woven fabric and a surface coating bonded by an adhesive; the base fabric is a cotton and linen knitted fabric, and the bamboo fiber non-woven fabric has a bamboo fiber content of 100%; the adhesive is a polyacrylate adhesive HENKEL Loctite H5004; the base fabric has a thickness of 1 mm, the bamboo fiber non-woven fabric has a thickness of 0.5 mm, and the adhesive has a thickness of 20 μm

[0096] The surface coating comprises the following raw materials in parts by weight: 105 parts of polyurethane prepolymer, 1.5 parts of silane coupling agent KH-560, 5 parts of triethylamine, 155 parts of deionized water, 0.75 parts of defoaming agent BYK-141, 0.6 parts of dispersant Efka PU 4010, and 1.1 parts of leveling agent KMT-5510S;

[0097] The preparation method of the polyurethane prepolymer comprises: vacuum dehydrating trihydroxy polyoxypropylene ether at a temperature of 105° C. for 75 minutes, adding modified zeolite under stirring at a speed of 350 r / min, then ultrasonically dispersing for 35 minutes, and finally adding toluene-2,4-diisocyanate and reacting at 70° C. for 4.5 hours to obtain the prepolymer; the weight ratio of trihydroxy polyoxypropylene ether, modified zeolite and toluene-2,4-diisocyanate is 16:3.5:21;

[0098] The preparation method of the modified zeolite comprises: firstly, washing the zeolite with deionized water, drying at a temperature of 85°C for 70 minutes, mixing an acetic acid aqueous solution with a volume fraction of 5.5% and a chitosan aqueous solution with a volume ratio of 2.5:7, adding zeolite with a mass fraction of 13% relative to the mixed solution, shaking at room temperature and 155r / min for 7 hours, washing to neutrality, drying and grinding to obtain the modified zeolite;

[0099] The preparation method of the surface coating comprises: mixing triethylamine and aminosilane coupling agent KH550 and dispersing them in deionized water at 5°C, adding prepolymer and then shearing and emulsifying for 35 minutes, adding defoamer and dispersing evenly to obtain an aqueous polyurethane emulsion with a solid content of 33.5% and an aminosilane coupling agent KH550 chain extension, adding modified montmorillonite and a dispersant to the polyurethane emulsion and dispersing them for 15 minutes at a stirring speed of 300 r / min, then adding an emulsifying agent and a leveling agent and continuing to disperse them for 25 minutes to obtain the surface coating;

[0100] In this embodiment, a method for preparing an environmentally friendly biosynthetic leather comprises the following steps: coating both sides of a base fabric with adhesive and then covering them with bamboo fiber non-woven fabric, continuing to coat the outer layer of the bamboo fiber non-woven fabric on one side with adhesive, coating the outer surface of the bamboo fiber non-woven fabric with a coating machine and curing it at 32°C for 27.5 minutes, the coating machine having a speed of 5.5 m / min, and then repeating the above operation on the bamboo fiber on the other side, followed by washing and drying, and the final single-side coating thickness is 0.5 mm.

[0101] Comparative Example 7

[0102] The comparative example provides an environmentally friendly biosynthetic leather, which includes, from the inside to the outside, a base fabric, a bamboo fiber non-woven fabric and a surface coating bonded by an adhesive; the base fabric is a cotton and linen knitted fabric, and the bamboo fiber non-woven fabric has a bamboo fiber content of 100%; the adhesive is a polyacrylate adhesive HENKEL Loctite H5004; the base fabric has a thickness of 1 mm, the bamboo fiber non-woven fabric has a thickness of 0.5 mm, and the adhesive has a thickness of 20 μm

[0103] The surface coating comprises the following raw materials in parts by weight: 105 parts of polyurethane prepolymer, 1.5 parts of silane coupling agent KH-560, 5 parts of triethylamine, 155 parts of deionized water, 14 parts of organic modified zeolite, 0.75 parts of defoaming agent BYK-141, 0.6 parts of dispersant Efka PU 4010, and 1.1 parts of leveling agent KMT-5510S;

[0104] The preparation method of the polyurethane prepolymer comprises: vacuum dehydrating trihydroxy polyoxypropylene ether at a temperature of 105° C. for 75 minutes, adding modified zeolite under stirring at a speed of 350 r / min, then ultrasonically dispersing for 35 minutes, and finally adding toluene-2,4-diisocyanate and reacting at 70° C. for 4.5 hours to obtain the prepolymer; the weight ratio of trihydroxy polyoxypropylene ether, modified zeolite and toluene-2,4-diisocyanate is 16:3.5:21;

[0105] The preparation method of the modified zeolite comprises: firstly, washing the zeolite with deionized water, drying at a temperature of 85°C for 70 minutes, mixing an acetic acid aqueous solution with a volume fraction of 5.5% and a chitosan aqueous solution with a volume ratio of 2.5:7, adding zeolite with a mass fraction of 13% relative to the mixed solution, shaking at room temperature and 155r / min for 7 hours, washing to neutrality, drying and grinding to obtain the modified zeolite;

[0106] The preparation method of organic modified zeolite comprises: adding an excess of hexadecyltrimethylammonium bromide aqueous solution to a zeolite aqueous solution with a mass concentration of 6% at 85°C, stirring for 2.5 hours, filtering, and washing with deionized water until there is no Br － , vacuum dried and ground, and passed through a 200-mesh sieve;

[0107] The preparation method of the surface coating comprises: mixing triethylamine and aminosilane coupling agent KH550 and dispersing them in deionized water at 5°C, adding prepolymer and then shearing and emulsifying for 35 minutes, adding defoamer and dispersing evenly to obtain an aqueous polyurethane emulsion with a solid content of 33.5% and an aminosilane coupling agent KH550 chain extension, adding modified montmorillonite and a dispersant to the polyurethane emulsion and dispersing them for 15 minutes at a stirring speed of 300 r / min, then adding an emulsifying agent and a leveling agent and continuing to disperse them for 25 minutes to obtain the surface coating;

[0108] In this embodiment, a method for preparing an environmentally friendly biosynthetic leather comprises the following steps: coating both sides of a base fabric with adhesive and then covering them with bamboo fiber non-woven fabric, continuing to coat the outer layer of the bamboo fiber non-woven fabric on one side with adhesive, coating the outer surface of the bamboo fiber non-woven fabric with a coating machine and curing it at 32°C for 27.5 minutes, the coating machine having a speed of 5.5 m / min, and then repeating the above operation on the bamboo fiber on the other side, followed by washing and drying, and the final single-side coating thickness is 0.5 mm.

[0109] Comparative Example 8

[0110] The comparative example provides an environmentally friendly biosynthetic leather, which includes, from the inside to the outside, a base fabric, a bamboo fiber non-woven fabric and a surface coating bonded by an adhesive; the base fabric is a cotton and linen knitted fabric, and the bamboo fiber non-woven fabric has a bamboo fiber content of 100%; the adhesive is a polyacrylate adhesive HENKEL Loctite H5004; the base fabric has a thickness of 1 mm, the bamboo fiber non-woven fabric has a thickness of 0.5 mm, and the adhesive has a thickness of 20 μm

[0111] The surface coating comprises the following raw materials in parts by weight: 105 parts of polyurethane prepolymer, 1.5 parts of silane coupling agent KH-560, 5 parts of triethylamine, 155 parts of deionized water, 14 parts of modified zeolite, 0.75 parts of defoaming agent BYK-141, 0.6 parts of dispersant EfkaPU 4010, and 1.1 parts of leveling agent KMT-5510S;

[0112] The preparation method of the polyurethane prepolymer comprises: vacuum dehydrating trihydroxy polyoxypropylene ether at a temperature of 105° C. for 75 minutes, adding modified zeolite under stirring at a speed of 350 r / min, then ultrasonically dispersing for 35 minutes, and finally adding toluene-2,4-diisocyanate and reacting at 70° C. for 4.5 hours to obtain the prepolymer; the weight ratio of trihydroxy polyoxypropylene ether, modified zeolite and toluene-2,4-diisocyanate is 16:3.5:21;

[0113] The preparation method of the modified zeolite comprises: firstly, washing the zeolite with deionized water, drying at a temperature of 85°C for 70 minutes, mixing an acetic acid aqueous solution with a volume fraction of 5.5% and a chitosan aqueous solution with a volume ratio of 2.5:7, adding zeolite with a mass fraction of 13% relative to the mixed solution, shaking at room temperature and 155r / min for 7 hours, washing to neutrality, drying and grinding to obtain the modified zeolite;

[0114] The preparation method of the surface coating comprises: mixing triethylamine and aminosilane coupling agent KH550 and dispersing them in deionized water at 5°C, adding prepolymer and then shearing and emulsifying for 35 minutes, adding defoamer and dispersing evenly to obtain an aqueous polyurethane emulsion with a solid content of 33.5% and an aminosilane coupling agent KH550 chain extension, adding modified montmorillonite and a dispersant to the polyurethane emulsion and dispersing them for 15 minutes at a stirring speed of 300 r / min, then adding an emulsifying agent and a leveling agent and continuing to disperse them for 25 minutes to obtain the surface coating;

[0115] In this embodiment, a method for preparing an environmentally friendly biosynthetic leather comprises the following steps: coating both sides of a base fabric with adhesive and then covering them with bamboo fiber non-woven fabric, continuing to coat the outer layer of the bamboo fiber non-woven fabric on one side with adhesive, coating the outer surface of the bamboo fiber non-woven fabric with a coating machine and curing it at 32°C for 27.5 minutes, the coating machine having a speed of 5.5 m / min, and then repeating the above operation on the bamboo fiber on the other side, followed by washing and drying, and the final single-side coating thickness is 0.5 mm.

[0116] Test Example: The environmentally friendly biosynthetic leathers in the above-mentioned Examples 1-4 and Comparative Examples 1-8 were subjected to the following tests.

[0117] (1) Based on GB 7689-89 standard, the tensile strength and elongation at break of synthetic leather were tested using a tensile testing machine;

[0118] (2) Based on GB / T2791-1995 standard, the peel strength of synthetic leather was tested by repeated tests using a tensile testing machine and the average value was taken;

[0119] (3) Based on the QB / T4671-2014 standard, the hydrolysis resistance of synthetic leather was tested using a constant temperature and humidity tester; the hydrolysis resistance test was conducted using a 10% sodium hydroxide solution at a temperature of 25°C for 3 days;

[0120] (4) Based on GB / T 5453-1997 standard, the air permeability of synthetic leather was tested using an air permeability tester; the test results are shown in the following table:

[0121]

[0122] Finally, it should be noted that the above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. All technical solutions and improvements that do not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. Environmentally friendly biosynthetic leather, characterized in that: The invention comprises, from the inside to the outside, a base cloth bonded with an adhesive, a bamboo fiber non-woven fabric and a surface coating; the surface coating comprises the following raw materials in parts by weight: 100-110 parts of a polyurethane prepolymer, 1-2 parts of a silane coupling agent, 4-6 parts of triethylamine, 150-160 parts of deionized water, 12-16 parts of modified montmorillonite, 0.5-1 parts of a defoaming agent, 0.5-0.7 parts of a dispersant and 1-1.2 parts of a leveling agent.

2. The environmentally friendly biosynthetic leather according to claim 1, characterized in that: The base fabric is cotton and linen knitted fabric, and the bamboo fiber non-woven fabric contains 100% bamboo fiber.

3. The environmentally friendly biosynthetic leather according to claim 1, characterized in that: The adhesive is a polyacrylate adhesive.

4. The environmentally friendly biosynthetic leather according to claim 1, characterized in that: The preparation method of the polyurethane prepolymer comprises: vacuum dehydrating trihydroxy polyoxypropylene ether, adding modified zeolite under stirring conditions at a speed of 300-400 r / min, then ultrasonically dispersing for 30-40 minutes, and finally adding toluene-2,4-diisocyanate and reacting at 65-75° C. for 4-5 hours to obtain the prepolymer.

5. The environmentally friendly biosynthetic leather according to claim 4, characterized in that: The temperature of the vacuum dehydration is 100-110° C. and the time is 70-80 min.

6. The environmentally friendly biosynthetic leather according to claim 4, characterized in that: The weight ratio of the trihydroxy polyoxypropylene ether, the modified zeolite and toluene-2,4-diisocyanate is (15-17): (3-4): (20-22).

7. The environmentally friendly biosynthetic leather according to claim 4, characterized in that: The preparation method of the modified zeolite comprises: firstly washing the zeolite with deionized water, drying at a temperature of 80-90°C for 60-80 minutes, mixing an acetic acid aqueous solution with a volume ratio of (2-3):(6-8) and a volume fraction of 5-6% and a chitosan aqueous solution of 10-12 g / L, adding the zeolite, shaking at room temperature and 150-160 r / min for 6-8 hours, washing to neutrality, and drying and grinding to obtain the modified zeolite.

8. The environmentally friendly biosynthetic leather according to claim 1, characterized in that: The preparation method of the modified montmorillonite comprises: adding an excess of hexadecyltrimethylammonium bromide aqueous solution to a sodium montmorillonite aqueous solution with a mass concentration of 5-7% at 80-90° C., stirring for 2-3 hours, filtering, and washing with deionized water until there is no Br － , vacuum dried and ground, and passed through a 200-mesh sieve.

9. The environmentally friendly biosynthetic leather according to claim 1, characterized in that: The preparation method of the surface coating comprises: mixing and dispersing triethylamine and an aminosilane coupling agent in deionized water at 5°C, adding a prepolymer and then shearing and emulsifying for 30-40 minutes, adding a defoamer and dispersing evenly to obtain an aminosilane coupling agent-extended aqueous polyurethane emulsion with a solid content of 32-35%, adding modified montmorillonite and a dispersant to the polyurethane emulsion and dispersing for 10-20 minutes, then adding an emulsifying agent and a leveling agent and continuing to disperse for 20-30 minutes to obtain the surface coating.

10. A method for preparing an environmentally friendly biosynthetic leather according to any one of claims 1 to 9, characterized in that the steps include: After coating adhesive on both sides of the base fabric, cover them with bamboo fiber non-woven fabric, continue to coat adhesive on the outer layer of the bamboo fiber non-woven fabric on one side, use a coating machine to coat the surface coating on the outer surface of the bamboo fiber non-woven fabric and cure it at 30-34°C for 25-30 minutes. The speed of the coating machine is 5-6m / min, and then the above operation is repeated on the bamboo fiber on the other side, and then washed and dried.

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