CN110791972B - Breathable PU artificial leather and preparation method thereof - Google Patents

Breathable PU artificial leather and preparation method thereof Download PDF

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Publication number
CN110791972B
CN110791972B CN201810865436.5A CN201810865436A CN110791972B CN 110791972 B CN110791972 B CN 110791972B CN 201810865436 A CN201810865436 A CN 201810865436A CN 110791972 B CN110791972 B CN 110791972B
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artificial leather
layer
liquid medium
parts
foaming agent
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CN110791972A (en
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马永梅
张京楠
叶钢
郑鲲
尚欣欣
马远远
曹新宇
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Institute of Chemistry CAS
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Institute of Chemistry CAS
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/12—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins
    • D06N3/14—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins with polyurethanes
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/0043—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by their foraminous structure; Characteristics of the foamed layer or of cellular layers
    • D06N3/005—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by their foraminous structure; Characteristics of the foamed layer or of cellular layers obtained by blowing or swelling agent
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/0056—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the compounding ingredients of the macro-molecular coating
    • D06N3/0061—Organic fillers or organic fibrous fillers, e.g. ground leather waste, wood bark, cork powder, vegetable flour; Other organic compounding ingredients; Post-treatment with organic compounds
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/0056—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the compounding ingredients of the macro-molecular coating
    • D06N3/0063—Inorganic compounding ingredients, e.g. metals, carbon fibres, Na2CO3, metal layers; Post-treatment with inorganic compounds
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N2209/00—Properties of the materials
    • D06N2209/12—Permeability or impermeability properties
    • D06N2209/121—Permeability to gases, adsorption
    • D06N2209/123—Breathable
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N2211/00—Specially adapted uses
    • D06N2211/12—Decorative or sun protection articles
    • D06N2211/28—Artificial leather

Abstract

The invention aims to provide breathable PU (polyurethane) artificial leather and a preparation method thereof. The preparation method comprises the steps of firstly preparing the foaming agent by using the liquid medium and the matrix, then dispersing the foaming agent in the PU stock solution, uniformly mixing to obtain the PU raw material, coating and drying the PU raw material, and then bonding the PU raw material with the base cloth layer to obtain the artificial leather. The PU artificial leather provided by the invention utilizes the characteristics of the substrate, so that the liquid medium is released to form the pore channel in the heating and drying process, and the rising speed of the PU material skeleton strength is adjusted to be equal to the pore channel generation speed, thereby greatly improving the air permeability of the PU artificial leather.

Description

Breathable PU artificial leather and preparation method thereof
Technical Field
The invention relates to the technical field of PU artificial leather, in particular to breathable PU artificial leather and a preparation method thereof.
Background
With the enhancement of the environmental protection and animal protection consciousness of people and the development of chemical industry, people gradually replace expensive animal leather with artificial leather which has the appearance comparable to that of animal leather fabric. At present, artificial leather has some differences from animal leather in manufacturing process and use performance, such as poor softness and air permeability, and the like, especially the problem of air permeability exists, the poor air permeability can cause the reduction of human comfort and the like, diseases can also be caused by long-term use, and the air permeability of natural leather is about 1500 mL/(cm) ("Ml") (the natural leather has the advantages of good air permeability, and good2H) (Standard GB/T4689.22-1996). The superfine fiber synthetic leather is a composite material of polyurethane resin and superfine fibers, and has air permeability of zero to dozens of mL/(cm)2H), far from reaching the standard of leather, limits the application of artificial leather in the field of footwear. Natural leather also has some limitations, such as low strength,Easy mildew and easy degeneration, and the like, and the mechanical strength, the acid and alkali resistance, the quality uniformity, the shape retention property, the automatic cutting processing adaptability and the like of the synthetic leather are different from those of superfine fiber synthetic leather. Therefore, the development of high-performance superfine fiber synthetic leather is the most ideal way to replace natural leather at present.
Because the leather membrane of the superfine fiber synthetic leather produced by the traditional formula and process is very compact, the leather membrane has a good waterproof function, but has poor air permeability. Some people have adopted the method of laser drilling to increase the porousness on synthetic leather surface and then increase the ventilative moisture permeability of synthetic leather, but micropore aperture is difficult to control in the production process, and uneven micropore aperture or great micropore aperture will destroy the internal structure of synthetic leather, leads to physical mechanical properties and waterproof performance to descend by a wide margin, still makes in the external rainwater infiltration synthetic leather, also influences the outward appearance pleasing to the eye of synthetic leather simultaneously.
Chinese patent CN201310370192.0 has used the form of foaming agent to prepare breathable artificial PVC leather which can achieve the breathability of natural leather and has controllable micropore size, but the method has not ideal effect when used on PU 1.
Chinese patent CN201110308035.8 discloses a method for producing synthetic leather for clothing by using a chemical foaming pore-forming coating technology, which comprises the steps of coating a film on the surface of release paper by using a blade coating method and mixed slurry containing solvent type polyurethane and a pore-forming agent, coating an adhesive on the film, attaching the film to non-woven fabric for synthetic leather with a bottom layer foaming coating, forming a solvent type polyurethane dry-process film-moving coating on the bottom layer foaming coating, and finally washing with water to obtain the synthetic leather for clothing. The foaming agent used in the method is azodicarbonamide commonly used in the field, namely an AC foaming agent, the generated cells are not uniformly distributed, and the ventilation effect is not obviously improved.
Chinese patent CN201010208806.1 also discloses a method for producing a polyurethane insole material, which uses water as a foaming agent, but in the method, free water is added as a foaming agent in the process of synthesizing polyurethane, and due to incompatibility of water and polyurethane, finally formed cells cannot be uniformly distributed, and air permeability cannot be significantly improved.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide PU artificial leather with good air permeability, which takes a matrix combined with a liquid medium as a foaming agent, and the foaming agent is released to form a pore channel in the heating process of dry preparation, so that the air permeability of the PU artificial leather is greatly improved.
In order to achieve the purpose, the invention specifically adopts the following technical scheme:
the invention provides breathable PU artificial leather which comprises a base cloth layer and a plurality of surface layers adhered to the base cloth layer, wherein the surface layers are prepared by coating and drying PU raw materials containing foaming agents, and the foaming agents are prepared by combining substrates with liquid media.
In the scheme, the substrate can be a swelling macromolecule or an inorganic substance capable of being combined with a liquid medium, the swelling macromolecule is a polymer with a three-dimensional network structure, can absorb a large amount of liquid in the liquid medium to swell, and can keep the original structure of the swelling macromolecule without being dissolved after swelling, the three-dimensional crosslinking network structure mainly comprises chemical bonds, hydrogen bonds or van der waals force, when swelling, the liquid diffuses into the space between the crosslinking bonds, the swollen materials are uniformly mixed into PU stock solution, and then heating and drying are carried out, so that the liquid medium can be directly evaporated from the swelling combined state in the heating process, and holes are formed in the gradually solidified PU resin framework, and the PU surface layer with the ventilation effect is prepared; the inorganic substance capable of being combined with the liquid medium comprises a nano material with a spatial three-dimensional structure, the liquid medium is injected into and fills gaps of the nano material to form a paste with self-adhesion, the inorganic material combined with the liquid medium is uniformly mixed into PU stock solution, heating and drying are carried out, the liquid medium is subjected to phase change evaporation, on one hand, the space network structure gaps of the self structure of the inorganic material are enlarged, the agglomerated inorganic substance is uniformly dispersed in the PU resin framework, and on the other hand, a ventilation pore channel is formed in the PU resin framework. Preferably, the PU artificial leather has two face layers, one bonding layer and one base fabric layer.
The further scheme of the invention is as follows: pore channels which are in a three-dimensional net shape and are partially communicated with the surface of the surface layer are uniformly distributed in the surface layer; the thickness of the single-layer surface layer after coating and drying is 5-40 mu m, and the preferred thickness of the single-layer surface layer is 10-30 mu m; the air permeability of the PU artificial leather is 10-1200 mL/(cm)2H), preferably 200 to 1200 mL/(cm)2H), more preferably 500 to 1200 mL/(cm)2·h)。
In the scheme, as shown in a scanning electron microscope image of fig. 1, the PU artificial leather surface layer is an elastic body, and when the pore channels are directly observed, the pore channels can not be observed due to elasticity, so that nano silver is pressed in to occupy the pore channels, and as can be seen from the scanning electron microscope result, the uniformly distributed reticular nano-scale pore channels are formed in the PU artificial leather surface layer along the arrow direction.
The further scheme of the invention is as follows: the foaming agent comprises a matrix and a liquid medium, wherein the mass ratio of the matrix to the liquid medium in the foaming agent is 5-60: 40-95, preferably 10-40: 60-90, the liquid medium is completely combined in the matrix through chemical bonds and/or hydrogen bonds and/or Van der Waals force, and the matrix comprises a spatial network structure formed by stacking fixed structural units through shared corners, edges or surfaces.
In the above scheme, when the substrate is a swelling polymer, the main chain or the side group has a group which is lyophilic to the liquid medium, so that the action between the liquid medium and the polymer is larger than the action force between the polymers, and the swelling is easy to occur by absorbing liquid; the physical structure of the three-dimensional network structure has a low crosslinking degree, the moderate crosslinking degree can stabilize the swelling without dissolving, and the three-dimensional network structure can generate a sealing effect on the absorbed liquid, so that the absorbed liquid is completely combined in the matrix without generating a free liquid medium. When the substrate is an inorganic substance with a spatial three-dimensional structure, the liquid medium is filled in the gaps of the spatial structure of the inorganic substance, and the free liquid medium is also not generated. In order to improve the foaming effect of the invention, a liquid medium with poor compatibility with PU resin is selected, so that the generated pore canal has relatively uniform shape, if a free liquid medium exists in the foaming agent, when the foaming agent and PU stock solution are mixed and coated, PU component is separated out, so that the coating with uniform thickness can not be carried out, and the preparation of a surface layer is influenced.
The further scheme of the invention is as follows: the PU raw material comprises the following components in parts by weight: 1-30 parts of foaming agent, 100 parts of PU stock solution and 0-100 parts of dispersing agent.
In the above scheme, the foaming agent can be directly added into the PU stock solution for dispersion and mixing, or in order to better disperse the foaming agent in the PU stock solution, the foaming agent and the dispersing agent are mixed to form the foaming agent dispersion solution, and then the foaming agent dispersion solution is dissolved into the PU stock solution to form the PU stock solution. The PU stock solution is a commercial non-hydrophilic PU stock solution provided by a reagent supplier.
The further scheme of the invention is as follows: the bonding layer for bonding the surface layer and the base cloth layer comprises the following components in parts by weight: 1-30 parts of foaming agent, 100 parts of PU adhesive stock solution and 0-100 parts of dispersing agent; preferably, the dispersant is 10-80 parts.
In the scheme, the surface of the surface layer coated and dried on the release paper is continuously coated with the adhesive layer, and the adhesive layer containing the adhesive is cured according to the manufacturing method of the surface layer; because the bonding layer forms the PU layer containing the adhesive component during curing, the phenomenon that the adhesive is smeared after curing to block the pore passages formed in the PU can be avoided, and the ventilation effect of the bonding layer is ensured. The adhesive layer comprises PU adhesive raw materials, the PU adhesive raw materials are PU stock solution containing adhesives, are provided by reagent suppliers, and can be selected according to actual requirements.
The invention also provides a preparation method of the breathable PU artificial leather, which comprises the following steps:
(1) uniformly mixing a liquid medium and a matrix at a high speed to obtain a gel foaming agent;
(2) adding the foaming agent obtained in the step (1) into PU stock solution under the stirring condition to prepare PU raw material;
(3) coating the PU raw material in the step (2), and then heating and drying at the temperature of 135-190 ℃ to obtain a surface layer of the PU artificial leather;
(4) after coating a bonding layer on the dried surface layer in the step (3), placing a base fabric layer on the bonding layer, compacting, and heating and drying at the temperature of 135-190 ℃ to obtain PU artificial leather;
preferably, the heating and drying temperature in the steps (3) and (4) is 150-180 ℃;
preferably, the step (2) further comprises uniformly mixing the foaming agent and the dispersing agent, and then adding the PU stock solution under stirring to prepare the PU raw material.
In the method, although the heating rates of the PU stock solution in the PU raw material, the substrate combined with the liquid medium and the dispersing agent are different, when the temperature reaches 135-190 ℃, the volatilization rate of the dispersing agent and/or the liquid medium in the substrate is the fastest, and the rising speed of the PU resin skeleton strength is faster than the volatilization rate of the dispersing agent and/or the liquid medium, so that stable and uniform pore channels are formed in the PU surface layer. In addition, the liquid medium is in a combined state in the substrate, so that the volatilization temperature of the liquid medium is increased, and the liquid medium can be prevented from being volatilized in advance when the temperature is lower. And (4) after the temperature reaches a set range, putting release paper coated with PU raw materials into the heating device to dry.
According to the method, in the steps (3) and (4), in the process that the heating and drying temperature is higher than the boiling point of the liquid medium and reaches the curing temperature of the PU resin, the liquid medium is gasified, so that communicated holes are formed on the surface and inside of the gradually cured PU resin; the boiling point of the liquid medium is lower than the curing temperature of the PU resin, the boiling point is preferably not higher than 150 ℃, the liquid medium is selected from one or more of water, ethanol, butanol or pentanol, and is preferably water.
In the method, the liquid medium is common water and alcohol reagents, is low in cost and convenient to obtain, can be swelled in most of high polymer materials with water absorption functions, and reduces the emission of harmful substances in the process of preparing PU by a dry method.
According to the method, before the step (4) of coating the bonding layer, the step of coating the surface layer on the dried surface layer by layer for multiple times according to the method in the step (3); preferably, after two surface layers are coated, a bonding layer is coated, and then the PU artificial leather is bonded with the base cloth layer to form the PU artificial leather.
In the method, after the PU raw material is coated on the release paper and heated and dried to obtain the surface layer, the PU raw material can be continuously coated on the formed surface layer and heated and dried to form a plurality of surface layers which are overlapped layer by layer, after the required surface layer number is reached, the bonding layer is coated on the topmost surface layer, the base fabric layer is compacted on the bonding layer, and the heating and drying are carried out to obtain the artificial leather product.
According to the method, the thickness of the coating in the steps (3) and (4) is 0.08-0.2 mm, preferably 0.10-0.16 mm; the heating and drying time is 1-10 min, and the preferable drying time is 1.5-6 min.
In the method, because the liquid medium, the dispersing agent and the like are emitted out of the system during heating and drying, the thickness of the surface layer is gradually reduced in the process, so that a thicker PU raw material is coated to obtain a dried surface layer with the single-layer thickness of 5-40 mu m.
According to the above process, the matrix is selected from the group consisting of swollen macromolecules or inorganic substances which can bind to liquid media; the swelling polymer comprises one or more of polyacrylate, sodium polyacrylate, acrylic acid-vinyl alcohol copolymer, acrylonitrile polymerized saponified product, polyacrylamide, polyvinyl alcohol, vinyl acetate copolymer, polyethylene oxide, sodium alginate, starch-acrylonitrile graft copolymer, starch-acrylic acid copolymer, starch-acrylamide graft polymer and rubber blended composite water-absorbing material; the inorganic matter capable of being combined with the liquid medium comprises one or more of air-hardening clay material, layered titanate, layered phosphate, nano potassium titanate, sepiolite, hydrotalcite, graphene, layered metal oxide or layered metal hydroxide.
In the above method, the air-setting clay material is one of non-setting hydraulic cementing materials. Air-hardening gelling materials, such as kaolins, montmorillonites, lime, gypsum, magnesite, water glass, etc., which can only harden in the air and can only maintain and develop their strength in the air.
According to the method, the dispersing agent is selected from one or more of N, N-dimethylformamide, butanone, cyclohexane and N-hexane.
In the method, the temperature rising rates of the dispersing agent and the matrix containing the liquid medium are different, so that the volatilization speed generates a certain difference, and therefore, the processing temperature needs to be increased, so that the volatilization speeds of the dispersing agent and the liquid medium are consistent within the range of 135-190 ℃, and a large number of uniformly distributed pore channels in the PU surface layer are formed.
According to the method, the high-speed mixing in the step (1) adopts mechanical mixing including but not limited to kneading, shearing and stirring, and the stirring speed during stirring is 1000-10000 r/min.
According to the method, the base fabric layer is made of microfiber non-woven fabric, and the microfiber non-woven fabric includes but is not limited to one of polyester fiber non-woven fabric, polyurethane fiber non-woven fabric, nylon fiber non-woven fabric, polypropylene fiber non-woven fabric, polyethylene fiber non-woven fabric, polyacrylonitrile fiber non-woven fabric, viscose fiber non-woven fabric and cotton fiber non-woven fabric.
The preparation method of the PU artificial leather comprises the following steps:
(1) uniformly mixing a liquid medium and a matrix at a high speed according to a mass ratio of 40-95: 5-60 to obtain a gel foaming agent;
(2) adding 1-30 parts of the foaming agent obtained in the step (1) into 100 parts of PU stock solution under stirring, or mixing 1-30 parts of the foaming agent with 0-100 parts of a dispersing agent, and then adding 100 parts of the PU stock solution under stirring to prepare a PU raw material;
(3) coating the PU raw material in the step (2) on release paper, wherein the thickness of the coating is 0.08-0.2 mm, and then heating and drying at 135-190 ℃ for 1-10 min to obtain a surface layer of PU artificial leather;
(4) adding 1-30 parts of the foaming agent obtained in the step (1) into 100 parts of PU adhesive stock solution under stirring, or mixing 1-30 parts of the foaming agent with 0-100 parts of a dispersing agent, and adding 100 parts of the PU adhesive stock solution under stirring to obtain a bonding layer raw material;
(5) and (4) continuously coating the surface layer on the dried surface layer in the step (3) layer by layer and drying, finally coating the bonding layer raw material prepared in the step (4) with the thickness of 0.08-0.2 mm on the surface layer on the topmost layer, placing a base fabric layer on the bonding layer and compacting, and heating and drying at the temperature of 135-190 ℃ for 1-10 min to obtain the PU artificial leather.
The invention has the beneficial effects that:
1. the PU surface layer has good air permeability, and because the matrix combined with the liquid medium is adopted, the resin system does not contain the liquid medium in a free state, thereby preventing the PU resin from being separated out due to poor compatibility to cause that a coating cannot be formed;
2. in the heating process of the PU raw material, the foaming agent combined with the liquid medium is adopted, so that the rising speed of the PU skeleton strength is higher than the foam generating speed or is equal to the foam generating speed, and a PU surface layer with a porous and microporous structure is formed;
3. the foaming agent provided by the invention adopts water or alcohol reagents with lower cost to replace the common AC foaming agent in the prior art, so that the foaming effect is improved, and the emission of harmful substances in the preparation process is reduced.
Drawings
FIG. 1 is a sectional microscopic view of a PU artificial leather facing according to the present invention.
Detailed Description
The following are specific embodiments of the present invention, which are intended to further illustrate the invention and not to limit it.
Example 1
The artificial PU leather in the embodiment is prepared by the following method:
(1) uniformly stirring and mixing sodium polyacrylate, acrylic acid-vinyl alcohol copolymer and water at the mass ratio of 20:5:75 at the speed of 1000r/min to obtain a gel foaming agent;
(2) adding 1 part of the foaming agent obtained in the step (1) into 100 parts of PU surface resin JF-S-8031 stock solution (manufacturer: Zhejiang Huafeng group) under stirring to obtain a PU raw material;
(3) coating the PU raw material in the step (2) on release paper, wherein the thickness of the coating is 0.2mm, and then heating and drying at the temperature of 170 ℃ for 6min to obtain a surface layer of PU artificial leather;
(4) adding 1 part of the foaming agent obtained in the step (1) into 100 parts of PU adhesive resin JF-A-AH5030A stock solution (manufacturer: Zhejiang Huafeng group) under stirring to obtain a bonding layer raw material;
(5) and (4) continuously coating two surface layers on the dried surface layer in the step (3) and drying, finally coating the bonding layer raw material prepared in the step (4) with the thickness of 0.2mm on the surface layer at the topmost layer, placing a polyester fiber non-woven fabric base cloth layer on the bonding layer and compacting, and heating and drying at the temperature of 170 ℃ for 6min to obtain the PU artificial leather.
The PU Artificial leather manufactured in this example had an air permeability of 100 mL/(cm)2H) the thickness of the monolayer was 40 μm.
Example 2
The artificial PU leather in the embodiment is prepared by the following method:
(1) uniformly stirring and mixing polyacrylate and water at a mass ratio of 5:95 at a speed of 10000r/min to obtain a gel-like foaming agent;
(2) mixing 30 parts of foaming agent obtained in the step (1) with 100 parts of N, N-dimethylformamide, and adding 100 parts of PU surface layer resin JF-S-8033D stock solution (manufacturer: Zhejiang Huafeng group) under stirring to obtain PU raw material;
(3) coating the PU raw material in the step (2) on release paper, wherein the thickness of the coating is 0.1mm, and then heating and drying at the temperature of 190 ℃ for 2min to obtain a surface layer of PU artificial leather;
(4) mixing 30 parts of foaming agent obtained in the step (1) with 100 parts of N, N-dimethylformamide, and adding 100 parts of PU adhesive resin JF-A-AH5055 stock solution (manufacturer: Zhejiang Huafeng group) under stirring to obtain bonding layer raw material;
(5) and (3) continuously coating the bonding layer raw material with the thickness of 0.12mm prepared in the step (4) on the dried surface layer in the step (3), placing a polyurethane fiber non-woven fabric base fabric layer on the bonding layer, compacting, and heating and drying at the temperature of 190 ℃ for 4min to obtain the PU artificial leather.
The PU Artificial leather manufactured in this example had an air permeability of 1200 mL/(cm)2H) the thickness of the monolayer was 5 μm.
Example 3
The artificial PU leather in the embodiment is prepared by the following method:
(1) uniformly stirring and mixing polyacrylate and butanol at a mass ratio of 10:90 at 8000r/min to obtain a gel-like foaming agent;
(2) mixing 10 parts of foaming agent obtained in the step (1) with 30 parts of butanone, and adding 100 parts of PU surface resin JF-S-HS8045 stock solution (manufacturer: Zhejiang Huafeng group) under stirring to obtain PU raw material;
(3) coating the PU raw material in the step (2) on release paper, wherein the thickness of the coating is 0.12mm, and then heating and drying at 175 ℃ for 4min to obtain a surface layer of PU artificial leather;
(4) mixing 10 parts of foaming agent obtained in the step (1) with 30 parts of butanone, and adding 100 parts of PU adhesive resin JF-A-AH5015 stock solution (manufacturer: Zhejiang Huafeng group) under stirring to obtain a bonding layer raw material;
(5) and (3) continuously coating a surface layer on the dried surface layer in the step (3) according to the method in the step (3) and drying, finally coating the bonding layer raw material prepared in the step (4) with the thickness of 0.1mm on the surface layer at the topmost layer, placing a nylon fiber non-woven fabric base cloth layer on the bonding layer and compacting, and heating and drying at 175 ℃ for 4min to obtain the PU artificial leather.
The PU Artificial leather manufactured in this example had an air permeability of 500 mL/(cm)2H) the thickness of the monolayer was 26 μm.
Example 4
The artificial PU leather in the embodiment is prepared by the following method:
(1) uniformly stirring and mixing the vinyl acetate copolymer and the ethanol at a mass ratio of 40:60 at a speed of 6000r/min to obtain a gel foaming agent;
(2) adding 25 parts of foaming agent obtained in the step (1) into 100 parts of PU surface layer resin TC-660NY stock solution (manufacturer: Shanghai Tongchen chemical Co., Ltd.) under stirring to obtain a PU raw material;
(3) coating the PU raw material in the step (2) on release paper, wherein the thickness of the coating is 0.1mm, and then heating and drying at the temperature of 180 ℃ for 3.5min to obtain a surface layer of PU artificial leather;
(4) adding 25 parts of foaming agent obtained in the step (1) into 100 parts of PU adhesive resin TC-735A stock solution (manufacturer: Shanghai Tongchen chemical Co., Ltd.) under stirring to obtain a bonding layer raw material;
(5) and (3) continuously coating a surface layer on the dried surface layer in the step (3) according to the method in the step (3) and drying, finally coating the bonding layer raw material prepared in the step (4) with the thickness of 0.15mm on the surface layer at the topmost layer, placing a polyethylene fiber non-woven fabric base fabric layer on the bonding layer and compacting, and heating and drying at the temperature of 180 ℃ for 3min to obtain the PU artificial leather.
The PU Artificial leather manufactured in this example had an air permeability of 980 mL/(cm)2H) the thickness of the monolayer was 10 μm.
Example 5
The artificial PU leather in the embodiment is prepared by the following method:
(1) uniformly stirring and mixing polyethylene oxide, sodium alginate, ethanol and butanol at a mass ratio of 5:5:80:10 at a speed of 2000r/min to obtain a gel foaming agent;
(2) mixing 25 parts of foaming agent obtained in the step (1) with 80 parts of cyclohexane, and adding 100 parts of stock solution of the PU surface layer resin RY-3070 (manufacturer: Nicotiana Hua Daochi group) under stirring to obtain a PU raw material;
(3) coating the PU raw material in the step (2) on release paper, wherein the thickness of the coating is 0.15mm, and then heating and drying at 185 ℃ for 1.5min to obtain a surface layer of PU artificial leather;
(2) mixing 25 parts of foaming agent obtained in the step (1) with 80 parts of cyclohexane, and adding 100 parts of PU adhesive resin HD-5516S stock solution (manufacturer: Nicotina Hua Daichou) under stirring to obtain a bonding layer raw material;
(5) and (3) continuously coating the bonding layer raw material with the thickness of 0.2mm prepared in the step (4) on the dried surface layer in the step (3), placing a polypropylene fiber non-woven fabric base fabric layer on the bonding layer, compacting, and heating and drying at 185 ℃ for 2min to obtain the PU artificial leather.
The PU artificial leather manufactured in this example had an air permeability of 1050 mL/(cm)2H) the thickness of the monolayer was 8 μm.
Example 6
The artificial PU leather in the embodiment is prepared by the following method:
(1) uniformly mixing starch-acrylonitrile graft copolymer, starch-acrylic acid copolymer, starch-acrylamide graft polymer and water in a shearing mode according to the mass ratio of 5:5:10:80 to obtain a gel foaming agent;
(2) mixing 20 parts of foaming agent obtained in the step (1) with 60 parts of N, N-dimethylformamide, and adding 100 parts of TC-350AR (TC-350 AR) stock solution of PU surface resin (manufacturer: Shanghai Tong Chen chemical Co., Ltd.) under stirring to obtain PU raw material;
(3) coating the PU raw material in the step (2) on release paper, wherein the thickness of the coating is 0.12mm, and then heating and drying at the temperature of 170 ℃ for 3min to obtain a surface layer of PU artificial leather;
(4) mixing 20 parts of foaming agent obtained in the step (1) with 60 parts of N, N-dimethylformamide, and adding 100 parts of PU adhesive resin TC-4036 stock solution (manufacturer: Shanghai Tongcong chemical Co., Ltd.) under stirring to obtain a bonding layer raw material;
(5) and (3) continuously coating a surface layer on the dried surface layer in the step (3) according to the method in the step (3) and drying, finally coating the bonding layer raw material prepared in the step (4) with the thickness of 0.1mm on the surface layer at the topmost layer, placing a polyacrylonitrile fiber non-woven fabric base cloth layer on the bonding layer and compacting, and heating and drying at the temperature of 170 ℃ for 3min to obtain the PU artificial leather.
The PU Artificial leather manufactured in this example had an air permeability of 830 mL/(cm)2H) the thickness of the monolayer was 19 μm.
Example 7
The artificial PU leather in the embodiment is prepared by the following method:
(1) uniformly mixing the rubber blending composite water absorbing material and amyl alcohol in a mass ratio of 20:80 in a kneading manner to obtain a gel-like foaming agent;
(2) mixing 5 parts of foaming agent obtained in the step (1), 5 parts of normal hexane and 5 parts of cyclohexane, and adding 100 parts of PU surface layer resin HD-80NG stock solution (manufacturer: Nicotina Hua Daichou chemical group) under stirring to prepare PU raw material;
(3) coating the PU raw material in the step (2) on release paper, wherein the thickness of the coating is 0.2mm, and then heating and drying at the temperature of 150 ℃ for 4min to obtain a surface layer of PU artificial leather;
(4) 5 parts of foaming agent obtained in the step (1), 5 parts of normal hexane and 5 parts of cyclohexane are mixed, and 100 parts of PU adhesive resin HD-3503 stock solution (manufacturer: Tantaihua Daichemical group) is added under the stirring condition to prepare bonding layer raw material;
(5) and (3) continuously coating a surface layer on the dried surface layer in the step (3) according to the method in the step (3) and drying, finally coating the bonding layer raw material prepared in the step (4) with the thickness of 0.2mm on the surface layer at the topmost layer, placing a viscose non-woven fabric base cloth layer on the bonding layer and compacting, and heating and drying at the temperature of 150 ℃ for 6min to obtain the PU artificial leather.
The PU Artificial leather manufactured in this example had an air permeability of 200 mL/(cm)2H) the thickness of the monolayer was 35 μm.
Example 8
The artificial PU leather in the embodiment is prepared by the following method:
(1) uniformly stirring and mixing acrylonitrile polymer saponified water and ethanol at a mass ratio of 25:70:5 at a speed of 2000r/min to obtain a gel foaming agent;
(2) mixing 8 parts of foaming agent obtained in the step (1), 20 parts of N, N-dimethylformamide and 5 parts of butanone, and adding 100 parts of stock solution TC-3882SL (manufacturer: Shanghai Tong Chen chemical industry Co., Ltd.) of PU surface resin under stirring to obtain a PU raw material;
(3) coating the PU raw material in the step (2) on release paper, wherein the thickness of the coating is 0.2mm, and then heating and drying at 160 ℃ for 3.5min to obtain a surface layer of PU artificial leather;
(4) mixing 8 parts of foaming agent obtained in the step (1), 20 parts of N, N-dimethylformamide and 5 parts of butanone, and adding 100 parts of PU adhesive resin TC-7929SL stock solution (manufacturer: Shanghai Tong Chen chemical Co., Ltd.) under stirring to obtain an adhesive layer raw material;
(5) and (3) continuously coating a surface layer on the dried surface layer in the step (3) according to the method in the step (3) and drying, finally coating the bonding layer raw material prepared in the step (4) with the thickness of 0.2mm on the surface layer at the topmost layer, placing a cotton fiber non-woven fabric base fabric layer on the bonding layer and compacting, and heating and drying at the temperature of 160 ℃ for 5min to obtain the PU artificial leather.
The PU Artificial leather manufactured in this example had an air permeability of 350 mL/(cm)2H) the thickness of the monolayer was 30 μm.
Example 9
The artificial PU leather in the embodiment is prepared by the following method:
(1) stirring and mixing layered titanate, layered phosphate and water at a mass ratio of 20:5:75 uniformly at a speed of 1000r/min to obtain a gel foaming agent;
(2) adding 1 part of the foaming agent obtained in the step (1) into 100 parts of PU surface resin JF-S-AH7040 stock solution (manufacturer: Zhejiang Huafeng group) under stirring to obtain a PU raw material;
(3) coating the PU raw material in the step (2) on release paper, wherein the thickness of the coating is 0.2mm, and then heating and drying at 135 ℃ for 10min to obtain a surface layer of PU artificial leather;
(4) adding 1 part of the foaming agent obtained in the step (1) into 100 parts of PU adhesive resin JF-A-5030D stock solution (manufacturer: Zhejiang Huafeng group) under stirring to obtain a bonding layer raw material;
(5) and (4) continuously coating two surface layers on the dried surface layer in the step (3) and drying, finally coating the bonding layer raw material prepared in the step (4) with the thickness of 0.2mm on the surface layer at the topmost layer, placing a polyester fiber non-woven fabric base cloth layer on the bonding layer and compacting, and heating and drying at the temperature of 135 ℃ for 8min to obtain the PU artificial leather.
The PU Artificial leather manufactured in this example had an air permeability of 130 mL/(cm)2H) the thickness of the monolayer was 35 μm.
Example 10
The artificial PU leather in the embodiment is prepared by the following method:
(1) uniformly stirring and mixing the nano montmorillonite and water at a mass ratio of 5:95 at a speed of 10000r/min to obtain a gel foaming agent;
(2) mixing 30 parts of foaming agent obtained in the step (1) with 100 parts of N, N-dimethylformamide, and adding 100 parts of PU surface layer resin TC-5150EN stock solution (manufacturer: Shanghai Tong Chen chemical industry Co., Ltd.) under stirring to obtain PU raw material;
(3) coating the PU raw material in the step (2) on release paper, wherein the thickness of the coating is 0.08mm, and then heating and drying at the temperature of 145 ℃ for 5min to obtain a surface layer of PU artificial leather;
(4) mixing 30 parts of foaming agent obtained in the step (1) with 100 parts of N, N-dimethylformamide, and adding 100 parts of PU adhesive resin TC-4026 stock solution (manufacturer: Shanghai Tongcong chemical Co., Ltd.) under stirring to obtain a bonding layer raw material;
(5) and (3) continuously coating the bonding layer raw material with the thickness of 0.1mm prepared in the step (4) on the dried surface layer in the step (3), placing a polyurethane fiber non-woven fabric base fabric layer on the bonding layer, compacting, and heating and drying at the temperature of 145 ℃ for 3min to obtain the PU artificial leather.
The PU Artificial leather manufactured in this example had an air permeability of 1150 mL/(cm)2H) the thickness of the monolayer was 8 μm.
Example 11
The artificial PU leather in the embodiment is prepared by the following method:
(1) uniformly stirring and mixing sepiolite, hydrotalcite and butanol at a mass ratio of 5:5:90 at 8000r/min to obtain a gel foaming agent;
(2) mixing 10 parts of foaming agent obtained in the step (1) with 30 parts of butanone, and adding 100 parts of PU surface resin JF-S-L8022 stock solution (manufacturer: Zhejiang Huafeng group) under stirring to obtain PU raw material;
(3) coating the PU raw material in the step (2) on release paper, wherein the thickness of the coating is 0.16mm, and then heating and drying at the temperature of 180 ℃ for 7min to obtain a surface layer of PU artificial leather;
(4) mixing 10 parts of foaming agent obtained in the step (1) with 30 parts of butanone, and adding 100 parts of PU adhesive resin JF-A-5050D stock solution (manufacturer: Zhejiang Huafeng group) under stirring to obtain a bonding layer raw material;
(5) and (3) continuously coating a surface layer on the dried surface layer in the step (3) according to the method in the step (3) and drying, finally coating the bonding layer raw material prepared in the step (4) with the thickness of 0.2mm on the surface layer at the topmost layer, placing a nylon fiber non-woven fabric base fabric layer on the bonding layer and compacting, and heating and drying at the temperature of 180 ℃ for 5.5min to obtain the PU artificial leather.
The PU artificial leather manufactured in this example had an air permeability of 680 mL/(cm)2H) the thickness of the monolayer was 22 μm.
Example 12
The artificial PU leather in the embodiment is prepared by the following method:
(1) uniformly stirring and mixing the nano potassium titanate, the kaolin and the water at a mass ratio of 20:20:60 at a speed of 6000r/min to obtain a gel foaming agent;
(2) adding 25 parts of foaming agent obtained in the step (1) into 100 parts of PU surface resin TC-3900HVSL stock solution (manufacturer: Shanghai Tong morning chemical industry Co., Ltd.) under stirring to obtain a PU raw material;
(3) coating the PU raw material in the step (2) on release paper, wherein the thickness of the coating is 0.1mm, and then heating and drying at the temperature of 190 ℃ for 1min to obtain a surface layer of PU artificial leather;
(4) adding 25 parts of foaming agent obtained in the step (1) into 100 parts of PU adhesive resin TC-714A stock solution (manufacturer: Shanghai Tongchen chemical Co., Ltd.) under stirring to obtain a bonding layer raw material;
(5) and (3) continuously coating a surface layer on the dried surface layer in the step (3) according to the method in the step (3) and drying, finally coating the bonding layer raw material prepared in the step (4) with the thickness of 0.12mm on the surface layer at the topmost layer, placing a polyethylene fiber non-woven fabric base fabric layer on the bonding layer and compacting, and heating and drying at the temperature of 190 ℃ for 1min to obtain the PU artificial leather.
The PU Artificial leather manufactured in this example had an air permeability of 930 mL/(cm)2H) the thickness of the monolayer was 12 μm.
Example 13
The artificial PU leather in the embodiment is prepared by the following method:
(1) uniformly stirring and mixing gypsum, lime, water and ethanol at a mass ratio of 5:5:80:10 at a speed of 2000r/min to obtain a gel foaming agent;
(2) mixing 25 parts of foaming agent obtained in the step (1) with 80 parts of cyclohexane, and adding 100 parts of PU surface resin JF-S-M8065 stock solution (manufacturer: Zhejiang Huafeng group) under stirring to obtain PU raw material;
(3) coating the PU raw material in the step (2) on release paper, wherein the thickness of the coating is 0.16mm, and then heating and drying at 185 ℃ for 8min to obtain a surface layer of PU artificial leather;
(2) mixing 25 parts of foaming agent obtained in the step (1) with 80 parts of cyclohexane, and adding 100 parts of PU adhesive resin JF-A-AH5023 stock solution (manufacturer: Zhejiang Huafeng group) under stirring to obtain a bonding layer raw material;
(5) and (3) continuously coating the bonding layer raw material with the thickness of 0.16mm prepared in the step (4) on the dried surface layer in the step (3), placing a polypropylene fiber non-woven fabric base fabric layer on the bonding layer, compacting, and heating and drying at 185 ℃ for 6min to obtain the PU artificial leather.
The PU Artificial leather produced in this example had an air permeability of 1170 mL/(cm)2H) the thickness of the monolayer was 7 μm.
Comparative example 1
In this comparative example, on the basis of example 2, the liquid medium and the substrate were directly mixed into the PU stock solution without being previously mixed, and the preparation method was specifically as follows:
(1) mixing polyacrylate, water, N, N-dimethylformamide and PU stock solution in a mass ratio of 1.5:28.5:100: 100;
(2) the PU raw materials are quickly layered, the upper layer is colorless liquid, the lower layer is PU resin, the raw materials lose the whole fluidity, and the subsequent coating process cannot be carried out.
Experimental example 1
Taking the foaming agent prepared in the step (1) in the examples 1, 2, 6, 9 and 10, measuring the DSC temperature rise curve in a non-freezing state, obtaining two obvious water loss absorption peaks which correspond to the freezable binding water and the non-freezable binding water in the foaming agent respectively, thereby showing that the foaming agent provided by the invention does not contain free water, so that the prepared surface layer does not have bulges caused by incompatibility of PU and the free water, and does not have a cracking phenomenon.
Experimental example 2
The air permeability and the single-layer surface layer thickness of the samples 1 to 8 and the comparative sample 1 are respectively tested, wherein the air permeability is tested according to the method of QB/T2799-2006, and the results are shown in the following table:
Figure BDA0001750812110000151
Figure BDA0001750812110000161
as can be seen from the above table, the PU surface layer of the invention has good air permeability, because the matrix combined with the liquid medium is adopted, the resin system does not contain the liquid medium in a free state, and the PU resin is prevented from being separated out due to poor compatibility to cause that a coating cannot be formed; in the heating process of the PU raw material, the foaming agent combined with the liquid medium is adopted, so that the rising speed of the PU skeleton strength is higher than the foam generating speed or is equal to the foam generating speed, and the PU surface layer with a porous and microporous structure is formed.
In contrast, comparative example 1, which does not combine a liquid medium in a matrix but adopts direct mixing for dry process preparation, destroys the uniform stability of the PU raw material due to the presence of a free liquid medium, causes a phase separation phenomenon, and fails to form usable PU artificial leather.
The present invention has been described in detail in order to enable those skilled in the art to understand the invention and to practice it, and it is not intended to limit the scope of the invention, and all equivalent changes and modifications made according to the spirit of the present invention should be covered by the present invention.

Claims (19)

1. A breathable PU artificial leather comprising: the fabric comprises a plurality of surface layers, a bonding layer and a base fabric layer, and is characterized in that the surface layers are prepared by the following method:
(1) uniformly mixing a liquid medium and a matrix at a high speed to obtain a gel foaming agent;
(2) adding the foaming agent obtained in the step (1) into PU stock solution under the stirring condition to prepare PU raw material;
(3) coating the PU raw material in the step (2), and then heating and drying at the temperature of 135-190 ℃ to obtain a surface layer of the PU artificial leather;
in the step (3), in the process that the heating and drying temperature is higher than the boiling point of the liquid medium and reaches the curing temperature of the PU resin, the liquid medium is gasified, so that communicated holes are formed on the surface and inside of the gradually cured PU resin; the boiling point of the liquid medium is lower than the curing temperature of the PU resin;
the PU artificial leather is characterized in that pore channels which are three-dimensional net-shaped and are partially communicated with the surface of the surface layer are uniformly distributed in the surface layer, and the air permeability of the PU artificial leather is 10-1200 mL/cm2·h。
2. The PU artificial leather according to claim 1, wherein the PU artificial leather has an air permeability of 200 to 1200mL/cm2·h。
3. The PU artificial leather of claim 1, which isCharacterized in that the air permeability of the PU artificial leather is 500-1200 mL/cm2·h。
4. The PU artificial leather according to claim 1, wherein a mass ratio of the matrix to the liquid medium in the foaming agent is 5-60: 40-95, the liquid medium is completely bound in the matrix by chemical and/or hydrogen bonding and/or Van der Waals force, and the matrix comprises a spatial network structure formed by stacking fixed structure units through a common corner, edge or face.
5. The PU artificial leather according to claim 4, wherein the mass ratio of the matrix to the liquid medium in the foaming agent is 10-40: 60-90.
6. The PU artificial leather according to any one of claims 1 to 5, wherein the PU raw material comprises the following components in parts by weight:
1-30 parts of foaming agent
PU stock solution 100 parts
0-100 parts of a dispersing agent.
7. The PU artificial leather according to any one of claims 1 to 5, wherein the bonding layer is used for bonding the top layer and the base fabric layer, and comprises the following components in parts by weight:
1-30 parts of foaming agent
PU adhesive stock solution 100 parts
0-100 parts of a dispersing agent.
8. The PU artificial leather according to claim 7, wherein the dispersant in the adhesive layer is 10 to 80 parts.
9. A method for preparing breathable PU artificial leather is characterized by comprising the following steps:
(1) uniformly mixing a liquid medium and a matrix at a high speed to obtain a gel foaming agent;
(2) adding the foaming agent obtained in the step (1) into PU stock solution under the stirring condition to prepare PU raw material;
(3) coating the PU raw material in the step (2), and then heating and drying at the temperature of 135-190 ℃ to obtain a surface layer of the PU artificial leather;
(4) after coating a bonding layer on the dried surface layer in the step (3), placing a base fabric layer on the bonding layer, compacting, and heating and drying at the temperature of 135-190 ℃ to obtain PU artificial leather;
in the steps (3) and (4), in the process that the heating and drying temperature is higher than the boiling point of the liquid medium and reaches the curing temperature of the PU resin, the liquid medium is gasified, so that communicated holes are formed on the surface and inside of the gradually cured PU resin; the boiling point of the liquid medium is lower than the curing temperature of the PU resin.
10. The method according to claim 9, wherein the temperature for heating and drying in steps (3) and (4) is 150 to 180 ℃.
11. The method according to claim 9, wherein the step (2) further comprises mixing the foaming agent and the dispersing agent uniformly, and then adding the PU stock solution under stirring to obtain the PU raw material.
12. The method of claim 9, wherein the liquid medium has a boiling point of not higher than 150 ℃.
13. The method according to claim 12, wherein the liquid medium is selected from one or more of water, ethanol, butanol or pentanol.
14. The method of claim 13, wherein the liquid medium is selected from water.
15. The method of claim 9, wherein step (4) further comprises applying a top coat on the dried top coat multiple times in a layer-by-layer manner according to the method of step (3) before applying the adhesive layer.
16. The method of claim 15, wherein the step (4) comprises, before the step of applying the adhesive layer, applying two surface layers on the dried surface layer according to the method of the step (3), and then applying an adhesive layer and bonding the adhesive layer to the base fabric layer to form the PU artificial leather.
17. The method according to any one of claims 9,15 or 16, wherein the thickness of the coating in steps (3) and (4) is 0.08 to 0.2 mm; the heating and drying time is 1-10 min.
18. The method according to claim 17, wherein the thickness of the coating in steps (3) and (4) is 0.10 to 0.16 mm; the heating and drying time is 1.5-6 min.
19. The method of claim 9, wherein the substrate is selected from the group consisting of swollen macromolecules or inorganic substances that can bind to liquid media; the swelling polymer comprises one or more of polyacrylate, sodium polyacrylate, acrylic acid-vinyl alcohol copolymer, acrylonitrile polymerized saponified product, polyacrylamide, polyvinyl alcohol, vinyl acetate copolymer, polyethylene oxide, sodium alginate, starch-acrylonitrile graft copolymer, starch-acrylic acid copolymer, starch-acrylamide graft polymer and rubber blended composite water-absorbing material; the inorganic matter capable of being combined with the liquid medium comprises one or more of air-hardening clay material, layered titanate, layered phosphate, nano potassium titanate, sepiolite, hydrotalcite, graphene, layered metal oxide or layered metal hydroxide.
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