阅读说明：本技术 一种高耐磨pu合成革及其制备方法 (High-wear-resistance PU synthetic leather and preparation method thereof ) 是由 吕兴鹏 于 2020-05-26 设计创作，主要内容包括：本发明属于PU合成革技术领域,具体的说是一种高耐磨PU合成革及其制备方法,所述该PU合成革包括基布层、涂层和离型纸；述基布层为无纺布材料设计,且采用双层复合材料；所述基布层的上表面附有涂层；所述涂层分为皮层涂层和表皮涂层；所述基布层的上表面附有皮层涂层；所述皮层涂层的上表面附有表皮涂层；所述表皮涂层的上表面贴合有离型纸；通过本发明有效的实现了PU合成革耐水洗、性变小、不易产生静电、强度高以及抗菌性能优良,同时具有稳定的电磁屏蔽性能,且PU涂层的耐磨性能大幅提高,不易在革面摩擦后产生针孔,使用时可以长期保存外观的美观性。(The invention belongs to the technical field of PU synthetic leather, and particularly relates to high-wear-resistance PU synthetic leather and a preparation method thereof, wherein the PU synthetic leather comprises a base cloth layer, a coating and release paper; the base cloth layer is designed by a non-woven fabric material and adopts a double-layer composite material; the upper surface of the base cloth layer is attached with a coating; the coating comprises a skin layer coating and a skin layer coating; the upper surface of the base cloth layer is attached with a skin layer coating; the upper surface of the skin layer coating is attached with a skin layer coating; release paper is attached to the upper surface of the surface coating; the PU synthetic leather has the advantages of water washing resistance, small property, low possibility of generating static electricity, high strength, excellent antibacterial performance, stable electromagnetic shielding performance, greatly improved wear resistance of the PU coating, low possibility of generating pinholes after friction of the leather surface and long-term storage of the appearance attractiveness during use.)

1. A preparation method of high wear-resistant PU synthetic leather is characterized by comprising the following steps: the preparation method comprises the following steps:

s1: raw materials of the coating paint: weighing 50 parts of aliphatic or alicyclic isocyanate, 50 parts of polycarbonate diol, 4-8 parts of glass fiber powder, 1-3 parts of silicon dioxide, 1-3 parts of white carbon black, 0.1-0.2 part of ethylene bis stearamide, 0.1-0.2 part of higher alcohol, 0.5-1.5 parts of chitosan oligosaccharide, 1-3 parts of nano silver, 1-3 parts of water, 15-25 parts of dimethylformamide, 5-10 parts of an additive and 10-15 parts of a wear-resistant auxiliary agent for later use;

s2: preparation of the coating paint: placing the glass fiber powder, the silicon dioxide and the white carbon black weighed in the S1 into a powder mixing machine, mixing to obtain a mixture A, then mixing the chitosan oligosaccharide weighed in the S1 with water to obtain a mixture B after uniform mixing, adding the aliphatic or alicyclic isocyanate, the polycarbonate diol, the ethylene bis-stearamide and the higher alcohol weighed in the S1 into dimethylformamide, heating and uniformly mixing, then sequentially adding the nano-silver weighed in the mixture B, the mixture A and the S1, continuously mixing until the solid is uniformly dispersed, and then adding the additive and the wear-resistant auxiliary agent to obtain the PU coating;

s3: coating (2) compounding of coating: coating the PU coating on the release paper (3) according to a certain thickness by a scraping rod, then putting the coated release paper (3) into an oven for drying to obtain a surface coating (22), and then coating the PU coating on the surface coating (22) again according to the same method to obtain a surface coating (21);

s4: finally, attaching the release paper (3) which is coated on the surface of the base cloth layer (1), compacting and drying, and then tearing off the release paper (3) to obtain the PU synthetic leather.

2. The preparation method of the high wear-resistant PU synthetic leather according to claim 1, wherein: the wear-resistant auxiliary agent is prepared from a mixed auxiliary agent material; the wear-resistant auxiliary agent is prepared by proportioning tetrafluoroethylene and organic silicon according to the mass ratio of 1: 1.

3. The preparation method of the high wear-resistant PU synthetic leather according to claim 1, wherein: the additive contains a thermal temperature agent, a light stabilizer and a hydrolysis stabilizer; the thermal temperature agent 2246 and hydroquinone or catechol are prepared according to the mass ratio of 1: 1; the light stabilizer is prepared from triazine derivative compounds; the hydrolysis stabilizer is prepared from polycarbodiimide.

4. The preparation method of the high wear-resistant PU synthetic leather according to claim 1, wherein: carry out line structural design from type paper (3) surface, and select for use the little line from type paper (3) (AR-181DM) from type paper (3).

5. A high wear-resistant PU synthetic leather suitable for the preparation method of the high wear-resistant PU synthetic leather according to any one of claims 1 to 4, which comprises a base cloth layer (1), a coating layer (2) and release paper (3), and is characterized in that: the base cloth layer (1) is designed by a non-woven fabric material and adopts a double-layer composite material; the upper surface of the base fabric layer (1) is attached with a coating (2); the coating (2) is divided into a skin layer coating (21) and a skin layer coating (22); the upper surface of the base cloth layer (1) is attached with a skin layer coating (21); the upper surface of the skin layer coating (21) is attached with a skin layer coating (22); the upper surface of the surface coating (22) is adhered with release paper (3); the coating (2) comprises the following raw materials in parts by weight: 50 parts of aliphatic or alicyclic isocyanate, 50 parts of polycarbonate diol, 4-8 parts of glass fiber powder, 1-3 parts of silicon dioxide, 1-3 parts of white carbon black, 0.1-0.2 part of ethylene bis stearamide, 0.1-0.2 part of higher alcohol, 0.5-1.5 parts of chitosan oligosaccharide, 1-3 parts of nano silver, 1-3 parts of water, 15-25 parts of dimethylformamide, 5-10 parts of an additive and 10-15 parts of a wear-resistant auxiliary agent.

6. A high abrasion PU synthetic leather according to claim 5, wherein: a fiber reinforced layer (11) is arranged between the two layers of composite non-woven fabrics, and the two layers of composite non-woven fabrics are connected with the fiber reinforced layer (11) in a pressing way; the fiber material of the fiber reinforced layer (11) is made of a metal material.

7. A high abrasion PU synthetic leather according to claim 5, wherein: the lower surface of the fiber reinforced layer (11) is attached with an adsorption layer (12); the adsorption layer (12) is designed for an activated carbon material.

8. The high abrasion PU synthetic leather according to claim 6, wherein: the double-layer composite non-woven fabric is provided with first guide holes (31) which are uniformly distributed on the side surface of one side of the release paper (3); the side surface of the double-layer composite non-woven fabric, which is far away from the release paper (3), is provided with second guide holes (32) which are uniformly distributed; the number of the second guide holes (32) is equal to that of the first guide holes (31), and the positions of the second guide holes are arranged in a one-to-one correspondence manner; the interior of the fiber reinforced layer (11) is attached with small lime particles (34) which are uniformly arranged.

9. The high abrasion-resistant PU synthetic leather according to claim 8, wherein: the double-layer composite non-woven fabric deviates from the side face of one side of the release paper (3) and is pressed with elastic bumps (33) which are uniformly arranged, and the second guide holes (32) are located between the adjacent elastic bumps (33).

Technical Field

The invention belongs to the technical field of PU synthetic leather, and particularly relates to high-wear-resistance PU synthetic leather and a preparation method thereof.

Background

The PU synthetic leather (polyurethane synthetic leather) has the advantages that the back of the PU synthetic leather is a cloth base (or a knitted cloth base), is easy to melt by burning, cannot be compared with a plurality of pvc synthetic leathers, and is an ideal material for replacing natural leather.

The PU coating coated on the surface of the PU synthetic leather is a polyurethane synthesized by diisocyanate, polyglycol and short-chain diol, and is widely applied to industries such as coatings, automobiles, synthetic leather, furniture, fibers, buildings, adhesion and the like due to excellent mechanical properties, solvent resistance and oil resistance.

According to CN108547156A sofa cover PU leather fabric and preparation method thereof for yacht, among the prior art, PU coating has thermal temperature nature, light stability, hydrolytic stability, gas permeability and bacterinertness are less strong, use under humid environment for a long time, easily take place to milden and rot, produce breeding of bacterium easily, and then produce the harm to user's healthy, PU coating's wearability is not good simultaneously, produce the pinhole after the friction of leather face easily, and then influence the pleasing to the eye of leather, and use for a long time and produce static easily, be difficult to satisfy the higher service condition scheduling problem of intensity requirement.

In view of this, in order to overcome the above technical problems, the present inventors designed and developed a high wear-resistant PU synthetic leather and a preparation method thereof, and solved the above technical problems.

Disclosure of Invention

In order to make up for the defects of the prior art and solve the problems that in the prior art, a PU coating has weak heat temperature property, light stability, hydrolytic stability, air permeability and antibacterial property, is easy to mildew and breed bacteria when being used in a humid environment for a long time, further causes harm to the health of a user, meanwhile, a PU coating has poor wear resistance, is easy to generate pinholes after the friction of a leather surface, further influences the attractiveness of the leather, is easy to generate static electricity after being used for a long time, and is difficult to meet the use condition with higher strength requirement, and the like, the invention provides the high-wear-resistance PU synthetic leather and the preparation method thereof.

The technical scheme adopted by the invention for solving the technical problems is as follows: the invention relates to a preparation method of high wear-resistant PU synthetic leather, which comprises the following steps:

s1: raw materials of the coating paint: weighing 50 parts of aliphatic or alicyclic isocyanate, 50 parts of polycarbonate diol, 4-8 parts of glass fiber powder, 1-3 parts of silicon dioxide, 1-3 parts of white carbon black, 0.1-0.2 part of ethylene bis stearamide, 0.1-0.2 part of higher alcohol, 0.5-1.5 parts of chitosan oligosaccharide, 1-3 parts of nano silver, 1-3 parts of water, 15-25 parts of dimethylformamide, 5-10 parts of an additive and 10-15 parts of a wear-resistant auxiliary agent for later use; compared with the PU coating prepared by the traditional technology, the PU coating prepared by the raw materials has excellent waterproofness, air permeability and antibacterial property, can be used in a humid environment for a long time, is not easy to mildew, can effectively inhibit the breeding of bacteria, ensures the health of a user, and reduces mildew spots generated by mildew.

S2: preparation of the coating paint: placing the glass fiber powder, the silicon dioxide and the white carbon black weighed in the S1 into a powder mixing machine, mixing to obtain a mixture A, then mixing the chitosan oligosaccharide weighed in the S1 with water to obtain a mixture B after uniform mixing, adding the aliphatic or alicyclic isocyanate, the polycarbonate diol, the ethylene bis-stearamide and the higher alcohol weighed in the S1 into dimethylformamide, heating and uniformly mixing, then sequentially adding the nano-silver weighed in the mixture B, the mixture A and the S1, continuously mixing until the solid is uniformly dispersed, and then adding the additive and the wear-resistant auxiliary agent to obtain the PU coating; by the premixing method, the complexity of a single operation flow is greatly simplified, and all mixing processes can be synchronously carried out, so that the mixing effect of all raw materials is optimal, the mixing time of all raw materials is greatly shortened, and the preparation efficiency of the modified PU coating is accelerated.

S3: compounding coating materials: coating the PU coating on release paper according to a certain thickness by a scraping rod, then putting the coated release paper into an oven for drying to obtain a surface coating, and then coating the PU coating on the surface coating again according to the same method to obtain a surface layer coating; the pattern of the PU synthetic leather prepared by the dry type mode of the release paper is the same as the lines of various release papers, and the PU synthetic leather is printed to be comparable to genuine leather in touch, toughness and appearance, and simultaneously has the characteristics of excellent strength and firm bonding.

S4: finally, attaching the release paper coated on the surface of the base cloth layer, compacting and drying, and then removing the release paper to obtain the PU synthetic leather.

Preferably, the wear-resistant auxiliary agent is prepared from a mixed auxiliary agent material; the wear-resistant auxiliary agent is prepared by proportioning tetrafluoroethylene and organic silicon according to the mass ratio of 1: 1; when the PU synthetic leather is in work, the coating of the PU synthetic leather is the most main coating which influences the wear resistance of the coating, so that the PU synthetic leather is also the key point for researching the wear resistance of the synthetic leather, and if the leather coating is poor in wear resistance, pinholes are easily generated after the leather is rubbed, so that the attractiveness of the leather is influenced; therefore, in order to improve the wear resistance of the coating formed by the surface coating and the skin coating, the tetrafluoroethylene and the organic silicon are proportioned according to the mass ratio of 1:1 to prepare the mixed auxiliary agent, and the wear-resistant auxiliary agent can show excellent wear resistance compared with single polytetrafluoroethylene micro powder, organic silicon auxiliary agent, micron silicon dioxide, meteorological silicon dioxide and the like.

Preferably, the additive contains a thermal temperature agent, a light stabilizer and a hydrolysis stabilizer; the thermal temperature agent 2246 and hydroquinone or catechol are prepared according to the mass ratio of 1: 1; the light stabilizer is prepared from triazine derivative compounds; the hydrolysis stabilizer is prepared from polycarbodiimide; when in work, heat, air, sunlight and moisture are commonly existed in nature, which are factors influencing the aging of PU leather, when the environmental temperature is higher, the polymer components of the PU coating can be decomposed, in particular, when the temperature is above 100 ℃, the decomposition proceeds rapidly, and under the irradiation of light, the PU coating material undergoes a crosslinking reaction by ultraviolet rays, thereby causing photoaging and embrittlement of the product, leading the produced quinone product to change from colorless to yellow, influencing the color stability of the product, meanwhile, the water vapor in the air is easy to permeate into the PU macromolecular net, the acting force between the adjacent molecules of the PU coating is seriously weakened, therefore, the mechanical property of the product is seriously reduced, and the arrangement 2246 and hydroquinone or catechol have a synergistic effect, so that the thermal stability of the PU coating can be effectively improved, and the PU can be prevented from being colored in the manufacturing process.

Preferably, the surface of the release paper is subjected to texture structure design, and the release paper is small-texture release paper (AR-181 DM); during operation, select for use the small lines from type paper (AR-181DM) through with type paper for use for contact area between line and the emery wheel reduces, and the cell and the gas pocket in the synthetic leather coating of small line are less simultaneously, thereby make the contact surface between coating and the emery wheel become smooth, consequently select for use the wear resistance that can further increase the coating from type paper of small line.

The PU synthetic leather is suitable for the preparation method of the PU synthetic leather with high wear resistance, and comprises a base cloth layer, a coating and release paper, wherein the base cloth layer is designed by a non-woven fabric material and adopts a double-layer composite material; the upper surface of the base cloth layer is attached with a coating; the coating comprises a skin layer coating and a skin layer coating; the upper surface of the base cloth layer is attached with a skin layer coating; the upper surface of the skin layer coating is attached with a skin layer coating; release paper is attached to the upper surface of the surface coating; the coating comprises the following raw materials in parts by weight: 50 parts of aliphatic or alicyclic isocyanate, 50 parts of polycarbonate diol, 4-8 parts of glass fiber powder, 1-3 parts of silicon dioxide, 1-3 parts of white carbon black, 0.1-0.2 part of ethylene bis stearamide, 0.1-0.2 part of higher alcohol, 0.5-1.5 parts of chitosan oligosaccharide, 1-3 parts of nano silver, 1-3 parts of water, 15-25 parts of dimethylformamide, 5-10 parts of an additive and 10-15 parts of a wear-resistant auxiliary agent; when the PU synthetic leather is in work, the composite non-woven fabric material is used as the base cloth layer, so that the base cloth layer has better antibacterial property, flame retardance and waterproof property, better spinnability, uniform lapping and particularly stronger stretch-resisting capability, and meanwhile, compared with the PU coating prepared by the raw materials in the traditional technology, the PU coating has excellent waterproof property, air permeability and antibacterial property, can be used in a humid environment for a long time, is not easy to mildew, can effectively inhibit the breeding of bacteria, ensures the body health of a user, reduces mildew generated by mildew, has the same pattern as various lines of release paper, and is printed to be comparable to real leather in touch, toughness and appearance.

Preferably, a fiber reinforcement layer is arranged between the two layers of composite non-woven fabrics, and the two layers of composite non-woven fabrics are connected with the fiber reinforcement layer in a pressing manner; the fiber material of the fiber reinforced layer is made of a metal material; when the double-layer composite non-woven fabric is in work, because the strength of a simple double-layer composite non-woven fabric material is difficult to meet the use under a higher stretching condition, such as leather boots, and leather jacket clothes are easily deformed after repeated cleaning by simply using the double-layer composite non-woven fabric, and the friction of the non-woven fabric easily generates static electricity, so that the attractiveness and the use experience and the service life are influenced, the problem of deformation of the non-woven fabric can be effectively reduced by arranging the fiber reinforced layer between the double-layer composite non-woven fabric and by the fiber reinforced layer made of a metal material, meanwhile, the metal fiber is injected into the non-woven fabric, because the conductivity of the metal fiber is strong, the static electricity dissipation capability is strong, the static electricity is not easy to generate, the generated static electricity is easy to dissipate, the accumulation of the static electricity is avoided, the strength of the base fabric layer, because the metal ion property is very strong, 5000 plus 8000 anions can be released per square centimeter of the metal fiber textile fabric, so that various strains can be inhibited and killed, and the antibacterial effect is obvious and durable.

Preferably, an adsorption layer is attached to the lower surface of the fiber reinforced layer; the adsorption layer is designed by an activated carbon material; during operation, through setting up the adsorbed layer, harmful gas in the adsorbable air avoids the gas that the synthetic leather distributed to cause the injury to the human body, and the inside anion that can distribute out of adsorbed layer, beneficial health.

Preferably, the side face, opposite to the release paper, of the double-layer composite non-woven fabric is provided with first guide holes which are uniformly distributed; the side surface of the double-layer composite non-woven fabric, which is far away from the release paper, is provided with second guide holes which are uniformly distributed; the second guide holes and the first guide holes are equal in number and are arranged in a one-to-one correspondence mode; small lime particles which are uniformly distributed are attached to the interior of the fiber reinforced layer; when the PU coating is used for a long time, the problem of coating falling off can occur after the PU coating is used for a long time or repeatedly contacted and rubbed, and meanwhile, the PU coating and the surface of the double-layer composite non-woven fabric are in simple surface-to-surface joint, the firmness is difficult to guarantee, the problem of coating falling off can also easily occur after the PU coating is used for a long time, the PU coating with too thick thickness can also easily bubble, in order to guarantee the firmness of coating adhesion, the PU coating on the surface of the release paper and the double-layer non-woven fabric needs to be pressurized, but after the pressurization, the PU coating on the surface of the release paper can overflow towards the periphery, and the uniformity of the pressing and the coating thickness is not facilitated, consequently through seting up first guide hole, when the pressurization, can make unnecessary PU coating can see through the inside that first guide hole enters into double-deck composite non-woven fabrics, reduce the peripheral problem that overflows of PU coating, simultaneously the PU coating of first guide hole inside links with the PU coating on double-deck composite non-woven fabrics surface, the bonding fastness of PU coating has been increased by a wide margin, through the inside attached to little lime particle at the fibre enhancement layer, after PU coating enters into the inside of double-deck composite non-woven fabrics through first guide hole, can with little lime particle between the reaction, make the inside moisture of PU coating adsorbed, promote the rapid draing of PU coating, the heat can be emitted in the reaction simultaneously, further promote the drying of PU coating, and the little lime particle of complete reaction not, also can be when the later stage uses, play effectual dampproofing effect.

Preferably, the side of the double-layer composite non-woven fabric, which is away from the release paper, is pressed with uniformly arranged elastic bumps, and the second guide holes are located between the adjacent elastic bumps; the during operation, because at the in-process that carries out the pressfitting between split paper and the double-deck compound non-woven fabrics, the inside moisture of PU coating can react with taking place between the small stone ash granule, easily produce carbon dioxide gas, gaseous if effectual discharge is not quick produces the influence to the adhesion of PU coating easily, also can influence the quality of PU synthetic leather simultaneously, consequently, through the elastic convex block that evenly arranges the lower surface pressfitting of double-deck compound non-woven fabrics, consequently in the pressurization process, can guarantee that the gaseous second guide hole that can pass through of formation, and the clearance between the elastic convex block is discharged, avoid PU synthetic leather pressurization in-process inside bloated problem of appearing, lead to the emergence of PU coating failure problem.

The invention has the following beneficial effects:

1. compared with the PU coating prepared by the traditional technology, the PU coating prepared by the novel raw material formula has excellent waterproofness, air permeability and antibacterial property, can be used in a humid environment for a long time, is not easy to mildew, can effectively inhibit the breeding of bacteria, ensures the health of a user, and reduces mildew spots generated by the mildew; through setting up the adsorbed layer, harmful gas in the adsorbable air avoids the gas that the synthetic leather distributed to cause the injury to the human body, and the adsorbed layer is inside can distribute out the anion, beneficial health.

2. According to the high-wear-resistance PU synthetic leather and the preparation method thereof, the tetrafluoroethylene and the organic silicon are proportioned according to the mass ratio of 1:1 to prepare the mixed auxiliary agent, and the wear-resistance auxiliary agent can show excellent wear-resistance compared with single polytetrafluoroethylene micro powder, single organic silicon auxiliary agent, single micron silicon dioxide, single meteorological silicon dioxide and the like. By setting 2246 to be used together with hydroquinone or catechol, the synergistic effect is achieved, the thermal stability of the PU coating can be effectively improved, and the PU can be prevented from being colored in the manufacturing process; through selecting for use the small line from type paper (AR-181DM) with the type paper for the area of contact between line and the emery wheel reduces, and the cell and the gas pocket in the synthetic leather coating of small line are less simultaneously, thereby make the contact surface between coating and the emery wheel become smooth, consequently select for use the wear resistance that can further increase the coating from type paper of small line.

Drawings

The invention will be further explained with reference to the drawings.

FIG. 1 is a flow chart of a preparation method of the present invention;

FIG. 2 is a perspective view of the PU synthetic leather of the present invention;

FIG. 3 is a top view of the PU synthetic leather of the present invention;

FIG. 4 is a cross-sectional view taken at A-A of FIG. 3;

FIG. 5 is an enlarged partial view at B in FIG. 4;

in the figure: the base cloth layer 1, the fiber reinforced layer 11, the adsorption layer 12, the coating 2, the skin layer coating 21, the skin layer coating 22, the release paper 3, the first guide hole 31, the second guide hole 32, the elastic bump 33 and the small lime particles 34.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

As shown in fig. 1 to 5, the preparation method of the high wear-resistant PU synthetic leather of the present invention comprises the following steps:

s1: coating 2 raw materials of the coating: weighing 50 parts of aliphatic or alicyclic isocyanate, 50 parts of polycarbonate diol, 4-8 parts of glass fiber powder, 1-3 parts of silicon dioxide, 1-3 parts of white carbon black, 0.1-0.2 part of ethylene bis stearamide, 0.1-0.2 part of higher alcohol, 0.5-1.5 parts of chitosan oligosaccharide, 1-3 parts of nano silver, 1-3 parts of water, 15-25 parts of dimethylformamide, 5-10 parts of an additive and 10-15 parts of a wear-resistant auxiliary agent for later use; compared with the PU coating prepared by the traditional technology, the PU coating prepared by the raw materials has excellent waterproofness, air permeability and antibacterial property, can be used in a humid environment for a long time, is not easy to mildew, can effectively inhibit the breeding of bacteria, ensures the health of a user, and reduces mildew spots generated by mildew.

S2: coating 2 preparation of coating: placing the glass fiber powder, the silicon dioxide and the white carbon black weighed in the S1 into a powder mixing machine, mixing to obtain a mixture A, then mixing the chitosan oligosaccharide weighed in the S1 with water to obtain a mixture B after uniform mixing, adding the aliphatic or alicyclic isocyanate, the polycarbonate diol, the ethylene bis-stearamide and the higher alcohol weighed in the S1 into dimethylformamide, heating and uniformly mixing, then sequentially adding the nano-silver weighed in the mixture B, the mixture A and the S1, continuously mixing until the solid is uniformly dispersed, and then adding the additive and the wear-resistant auxiliary agent to obtain the PU coating; by the premixing method, the complexity of a single operation flow is greatly simplified, and all mixing processes can be synchronously carried out, so that the mixing effect of all raw materials is optimal, the mixing time of all raw materials is greatly shortened, and the preparation efficiency of the modified PU coating is accelerated.

S3: coating 2 compounding of the coating: coating the PU coating on the release paper 3 according to a certain thickness by a scraper, then putting the coated release paper 3 into an oven for drying to obtain a surface coating 22, and then coating the PU coating on the surface coating 22 again according to the same method to obtain a surface coating 21; the pattern of the PU synthetic leather prepared by the dry type mode of the release paper 3 is the same as the lines of various release papers 3, and the PU synthetic leather is printed to be comparable to genuine leather in touch, toughness and appearance, and simultaneously has the characteristics of excellent strength and firm bonding.

S4: finally, attaching the release paper 3 which is coated on the surface of the base cloth layer 1, compacting and drying, and then tearing off the release paper 3 to obtain the PU synthetic leather.

As an embodiment of the invention, the wear-resistant auxiliary agent is prepared by mixing auxiliary agent materials; the wear-resistant auxiliary agent is prepared by proportioning tetrafluoroethylene and organic silicon according to the mass ratio of 1: 1; when the PU synthetic leather is in work, the coating 2 of the PU synthetic leather enables the leather surface to be attractive, improves the service performance of the leather and increases the color variety of the leather, the surface coating 22 of the coating 2 is the most main coating 2 influencing the wear resistance of the coating 2, so the PU synthetic leather is also the key point for researching the wear resistance of the synthetic leather, and if the surface coating 21 is poor in wear resistance, pinholes are easily generated after the leather surface is rubbed, so the attractiveness of the leather is influenced; therefore, in order to improve the wear resistance of the coating 2 consisting of the surface coating 22 and the skin coating 21, the tetrafluoroethylene and the organic silicon are proportioned according to the mass ratio of 1:1 to prepare the mixed auxiliary agent, and the wear-resistant auxiliary agent can show excellent wear resistance compared with single polytetrafluoroethylene micro powder, organic silicon auxiliary agent, micron silicon dioxide, gas phase silicon dioxide and the like through the mixed auxiliary agent.

As an embodiment of the invention, the additive contains a thermal temperature agent, a light stabilizer and a hydrolysis stabilizer; the thermal temperature agent 2246 and hydroquinone or catechol are prepared according to the mass ratio of 1: 1; the light stabilizer is prepared from triazine derivative compounds; the hydrolysis stabilizer is prepared from polycarbodiimide; when in work, heat, air, sunlight and moisture are commonly existed in nature, which are factors influencing the aging of PU leather, when the environmental temperature is higher, the polymer components of the PU coating can be decomposed, in particular, when the temperature is above 100 ℃, the decomposition proceeds rapidly, and under the irradiation of light, the PU coating material undergoes a crosslinking reaction by ultraviolet rays, thereby causing photoaging and embrittlement of the product, leading the produced quinone product to change from colorless to yellow, influencing the color stability of the product, meanwhile, the water vapor in the air is easy to permeate into the PU macromolecular net, the acting force between the adjacent molecules of the PU coating is seriously weakened, therefore, the mechanical property of the product is seriously reduced, and the arrangement 2246 and hydroquinone or catechol have a synergistic effect, so that the thermal stability of the PU coating can be effectively improved, and the PU can be prevented from being colored in the manufacturing process.

As an embodiment of the present invention, the surface of the release paper 3 is designed with a texture structure, and the release paper 3 is selected from small-texture release paper 3(AR-181 DM); during operation, through selecting for use the little line from type paper 3(AR-181DM) with type paper 3 for the area of contact between line and the emery wheel reduces, and the cell and the gas pocket in the synthetic leather coating 2 of little line are less simultaneously, thereby make the contact surface between coating 2 and the emery wheel become smooth, consequently select for use the wearability that the type paper 3 of little line can further increase coating 2.

The PU synthetic leather is suitable for the preparation method of the PU synthetic leather with high wear resistance, and comprises a base cloth layer 1, a coating layer 2 and release paper 3, wherein the base cloth layer 1 is designed by a non-woven fabric material and adopts a double-layer composite material; the upper surface of the base cloth layer 1 is attached with a coating layer 2; the coating 2 is divided into a skin layer coating 21 and a skin layer coating 22; the upper surface of the base cloth layer 1 is attached with a skin layer coating 21; the upper surface of the skin layer coating 21 is attached with a skin layer coating 22; the release paper 3 is adhered to the upper surface of the surface coating 22; the coating 2 comprises the following raw materials in parts by weight: 50 parts of aliphatic or alicyclic isocyanate, 50 parts of polycarbonate diol, 4-8 parts of glass fiber powder, 1-3 parts of silicon dioxide, 1-3 parts of white carbon black, 0.1-0.2 part of ethylene bis stearamide, 0.1-0.2 part of higher alcohol, 0.5-1.5 parts of chitosan oligosaccharide, 1-3 parts of nano silver, 1-3 parts of water, 15-25 parts of dimethylformamide, 5-10 parts of an additive and 10-15 parts of a wear-resistant auxiliary agent; when the PU synthetic leather is in work, the composite non-woven fabric material is used as the base cloth layer 1, so that the base cloth layer 1 has better antibacterial property, flame retardance and waterproof property, better spinnability, uniform lapping and particularly stronger stretch-resisting capability, and meanwhile, compared with the PU coating prepared by the raw materials in the traditional technology, the PU coating has excellent waterproof property, air permeability and antibacterial property, can be used in a humid environment for a long time, is not easy to mildew, can effectively inhibit the breeding of bacteria, ensures the health of a user, reduces mildew generated by mildew, has the same pattern as various patterns of the PU synthetic leather prepared by the dry type mode of the release paper 3 and the lines of various release paper 3, and is printed to be comparable to real leather in touch, toughness and appearance.

As an embodiment of the present invention, a fiber reinforced layer 11 is disposed between the two layers of composite non-woven fabrics, and the two layers of composite non-woven fabrics are connected to the fiber reinforced layer 11 in a pressing manner; the fiber material of the fiber reinforced layer 11 is made of a metal material; when the double-layer composite non-woven fabric is in use, the strength of a simple double-layer composite non-woven fabric material is difficult to meet the use under a higher stretching condition, such as leather boots, and leather jacket clothes are easy to deform after being repeatedly cleaned, and the friction of the non-woven fabric easily generates static electricity, so that the attractiveness, the use experience and the service life are influenced, therefore, the fiber reinforcing layer 11 is arranged between the double-layer composite non-woven fabrics, the deformation problem of the non-woven fabrics can be effectively reduced through the fiber reinforcing layer 11 made of a metal material, meanwhile, the metal fiber is injected into the non-woven fabrics, because the conductivity of the metal fiber is strong, the dissipation capacity of static electricity is strong, the static electricity is not easy to generate, the generated static electricity is easy to dissipate, the accumulation of the static electricity is avoided, the strength of the base fabric layer 1 can be greatly improved through the metal fiber, because the metal ion property is very strong, 5000 plus 8000 anions can be released per square centimeter of the metal fiber textile fabric, so that various strains can be inhibited and killed, and the antibacterial effect is obvious and durable.

As an embodiment of the present invention, the lower surface of the fiber reinforced layer 11 is attached with an adsorption layer 12; the adsorption layer 12 is designed by an activated carbon material; during operation, through setting up adsorbed layer 12, harmful gas in the adsorbable air avoids the gas that the synthetic leather distributed to cause the injury to the human body, and adsorbed layer 12 is inside can distribute out the anion, beneficial health.

As an embodiment of the invention, the double-layer composite non-woven fabric is provided with first guide holes 31 uniformly arranged on one side surface opposite to the release paper 3; the side surface of the double-layer composite non-woven fabric, which is far away from the release paper 3, is provided with second guide holes 32 which are uniformly distributed; the number of the second guide holes 32 is equal to that of the first guide holes 31, and the positions of the second guide holes are arranged in a one-to-one correspondence manner; small lime particles 34 which are uniformly arranged are attached to the interior of the fiber reinforced layer 11; when the PU coating is in operation, when the release paper 3 is attached to the surface of the double-layer composite non-woven fabric, a large amount of air is easy to be retained between the release paper 3 and the double-layer composite non-woven fabric, and the large amount of air can seriously obstruct the complete and effective attachment of the release paper 3 and the double-layer composite non-woven fabric, so that after the PU coating is dried, the problem of bubbles can occur, after long-time use or repeated contact and friction, the problem of PU coating damage and even dropping can occur, meanwhile, the PU coating and the surface of the double-layer composite non-woven fabric are simple surface-surface attachment, the firmness is difficult to ensure, after long-time use, the problem of dropping of the coating 2 can also easily occur, and the PU coating with too thick thickness can also easily bubble, in order to ensure the firmness of sticking and sticking of the coating 2, the pressurization between the release paper 3 and the double-layer, consequently through seting up first guide hole 31, when the pressurization, can make unnecessary PU coating can see through the inside that first guide hole 31 enters into double-deck compound non-woven fabrics, reduce the peripheral problem that overflows of PU coating, simultaneously inside PU coating of first guide hole 31 and the PU coating on double-deck compound non-woven fabrics surface unite, the bonding fastness of PU coating has been increased by a wide margin, through the inside small stone ash granule 34 of adhering to at fibre enhancement layer 11, after PU coating enters into the inside of double-deck compound non-woven fabrics through first guide hole 31, can with the reaction between the small stone ash granule 34, make the inside moisture of PU coating adsorbed, promote the rapid draing of PU coating, the while reaction can give off the heat, further promote the drying of PU coating, and the small stone ash granule 34 of complete reaction not, also can be when the later stage uses, play effectual dampproofing effect.

As an embodiment of the invention, the side of the double-layer composite non-woven fabric away from the release paper 3 is pressed with uniformly arranged elastic bumps 33, and the second guide holes 32 are located between adjacent elastic bumps 33; the during operation, because in-process that carries out the pressfitting between the paper of will separating 3 and double-deck compound non-woven fabrics, the inside moisture of PU coating can react with taking place between the small stone ash granule 34, easily produce carbon dioxide gas, gaseous if effectual discharge is not quick produces the influence to the adhesion of PU coating easily, can influence the quality of PU synthetic leather simultaneously, consequently, through the elastic convex block 33 that evenly arranges the lower surface pressfitting of double-deck compound non-woven fabrics, consequently in the pressurization process, can guarantee that the gaseous second guide hole 32 that can pass through of formation, and the clearance between the elastic convex block 33 is discharged, avoid PU synthetic leather pressurization in-process inside bloated gas problem that appears, lead to the emergence of PU coating failure problem.

The specific working process is as follows:

when the PU synthetic leather is in work, the composite non-woven fabric material is used as the base cloth layer 1, so that the base cloth layer 1 has better antibacterial property, flame retardance and waterproof property, better spinnability, uniform lapping and particularly stronger tensile resistance, and meanwhile, compared with the PU coating prepared by the traditional technology, the PU coating prepared by the raw materials has excellent waterproof property, air permeability and antibacterial property, can be used in a humid environment for a long time, is not easy to mildew, can effectively inhibit the breeding of bacteria, ensures the body health of a user, reduces mildew generated by mildew, has the same pattern as that of various release papers 3 in a dry mode of the release paper 3, and is printed to ensure that the PU synthetic leather is comparable to genuine leather in touch, toughness and appearance; the fiber reinforced layer 11 is arranged between the double-layer composite non-woven fabrics, the deformation problem of the non-woven fabrics can be effectively reduced through the fiber reinforced layer 11 made of metal materials, meanwhile, the metal fibers are injected into the non-woven fabrics, and due to the conductivity of the metal fibers, the static charge dissipation capability is strong, static electricity is not easy to generate, the generated static electricity is easy to dissipate, the accumulation of the static electricity is avoided, the strength of the base fabric layer 1 can be greatly improved through the metal fibers, the metal fibers can have the specific and stable electromagnetic shielding performance, the metal fibers simultaneously have good antibacterial performance, and due to the extremely strong metal ion performance, 5000 plus-energy 8000 negative ions can be released per square centimeter of the metal fiber textile fabric, various bacterial strains can be inhibited and killed, and the antibacterial effect is obvious and lasting; through setting up adsorbed layer 12, harmful gas in the adsorbable air avoids the gas that the synthetic leather distributed to cause the injury to the human body, and adsorbed layer 12 is inside can distribute out the anion, beneficial health.

In order to verify the influence of the wear-resistant auxiliary agent on the performance of the special high-wear-resistant PU synthetic leather in the high-wear-resistant PU synthetic leather and the preparation method thereof, the following four experimental groups are specially made for experimental verification:

experimental group 1

50 parts of aliphatic or alicyclic isocyanate, 50 parts of polycarbonate diol, 6 parts of glass fiber powder, 2 parts of silicon dioxide, 2 parts of white carbon black, 0.15 part of ethylene-based bis-stearamide, 0.15 part of higher alcohol, 1 part of chitosan oligosaccharide, 2 parts of nano-silver, 2 parts of water, 10 parts of dimethylformamide and 8 parts of additive.

Experimental group 2

50 parts of aliphatic or alicyclic isocyanate, 50 parts of polycarbonate diol, 6 parts of glass fiber powder, 2 parts of silicon dioxide, 2 parts of white carbon black, 0.15 part of ethylene-based bis-stearamide, 0.15 part of higher alcohol, 1 part of chitosan oligosaccharide, 2 parts of nano-silver, 2 parts of water, 10 parts of dimethylformamide, 8 parts of additive and mixed wear-resistant auxiliary agent.

Experimental group 3

50 parts of aliphatic or alicyclic isocyanate, 50 parts of polycarbonate diol, 6 parts of glass fiber powder, 2 parts of silicon dioxide, 2 parts of white carbon black, 0.15 part of ethylene-based bis-stearamide, 0.15 part of higher alcohol, 1 part of chitosan oligosaccharide, 2 parts of nano-silver, 2 parts of water, 10 parts of dimethylformamide, 8 parts of additive and polytetrafluoroethylene micropowder, preparing the PU synthetic leather according to the preparation method of the high-wear-resistance PU synthetic leather, and measuring the wear of the PU synthetic leather.

Experimental group 4

50 parts of aliphatic or alicyclic isocyanate, 50 parts of polycarbonate diol, 6 parts of glass fiber powder, 2 parts of silicon dioxide, 2 parts of white carbon black, 0.15 part of ethylene-based bis-stearamide, 0.15 part of higher alcohol, 1 part of chitosan oligosaccharide, 2 parts of nano-silver, 2 parts of water, 10 parts of dimethylformamide, 8 parts of additive and organic silicon assistant.

TABLE 1

TABLE 2

Table 2 shows that, through experimental group 1 and experimental group 2, under the condition that the wear-resisting auxiliary agent is lacked in the raw materials and the PU synthetic leather is obtained, it can be seen that the abrasion loss is far higher than the PU synthetic leather containing the wear-resisting auxiliary agent in the raw materials, and through experimental group 2, experimental group 3 and experimental group 4, under the same wear-resisting agent content condition, the abrasion loss is obtained through comparison: the experimental group 2 where the mixed wear-resistant auxiliary agent is located is larger than the experimental group 3 where the polytetrafluoroethylene micro powder is located and is larger than the experimental group 4 where the organic silicon auxiliary agent is located, so that the wear-resistant performance of the mixed wear-resistant auxiliary agent on the PU synthetic leather is better than that of the polytetrafluoroethylene micro powder and the organic silicon auxiliary agent, and the effect is more obvious along with the increase of the content of the wear-resistant auxiliary agent, so that the wear-resistant auxiliary agent can be used for remarkably improving the wear resistance of the PU synthetic leather.

While there have been shown and described what are at present considered the fundamental principles of the invention, its essential features and advantages, it will be understood by those skilled in the art that the invention is not limited by the embodiments described above, which are merely illustrative of the principles of the invention, but various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.