CN111206432A - Wet-process Yangbuck synthetic leather and preparation method thereof - Google Patents
Wet-process Yangbuck synthetic leather and preparation method thereof Download PDFInfo
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- CN111206432A CN111206432A CN202010010088.0A CN202010010088A CN111206432A CN 111206432 A CN111206432 A CN 111206432A CN 202010010088 A CN202010010088 A CN 202010010088A CN 111206432 A CN111206432 A CN 111206432A
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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
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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
- D06N3/0043—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
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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
- D06N3/0056—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
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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
- D06N3/0056—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
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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
- D06N3/0086—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the application technique
- D06N3/0088—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the application technique by directly applying the resin
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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
- D06N2209/00—Properties of the materials
- D06N2209/12—Permeability or impermeability properties
- D06N2209/121—Permeability to gases, adsorption
- D06N2209/123—Breathable
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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
- D06N2209/00—Properties of the materials
- D06N2209/12—Permeability or impermeability properties
- D06N2209/126—Permeability to liquids, absorption
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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
- D06N2211/00—Specially adapted uses
- D06N2211/12—Decorative or sun protection articles
- D06N2211/28—Artificial leather
Abstract
The invention provides wet Yangbuck synthetic leather and a preparation method thereof, wherein the wet Yangbuck synthetic leather comprises the following components in parts by weight: a base fabric composed of a fabric sheet; a surface layer based on an aqueous polyether polyurethane coating composition, said surface layer being located on said substrate, said surface layer having a porosity of 80-90%, said aqueous polyether polyurethane coating composition comprising, 70-85 wt% of an aqueous polyether polyurethane; 5-10 wt% of fiber powder; 3-6 wt% of a first blowing agent; 3-5 wt% of a second foaming agent; 1-3 wt% of a dispersant; 0.5-1.0 wt% of wetting agent; 1-2 wt% of bentonite; wherein the fiber powder consists of 95-97 wt% of cellulose and 3-5 wt% of fatty acid ester. The wet-process nubuck synthetic leather provided by the invention has excellent air permeability and moisture permeability, ideal yellowing resistance and fine and smooth velvet feeling on the surface.
Description
Technical Field
The invention relates to the technical field of synthetic leather manufacturing, in particular to wet-process Yangbuck synthetic leather and a preparation method thereof.
Background
The synthetic leather product has the characteristics of softness, wear resistance and the like, is low in price, can achieve the effect of imitating real leather, and is widely applied to products such as automobiles, bags, clothes, shoes and the like. At present, with the change of the market and the improvement of the taste of consumers, the requirements on the grade of synthetic leather are higher and higher, but the air permeability and the moisture permeability of the synthetic leather are not well solved, and particularly under the hot and humid condition, the synthetic leather has higher requirements on the air permeability and the moisture permeability, and the peculiar smell is easily generated due to too poor moisture permeability, so that the user experience is influenced, and therefore, research on the wet-process nubuck synthetic leather and the preparation method thereof is urgently needed.
Disclosure of Invention
In view of the defects of the prior art, one of the purposes of the invention is to provide wet-process nubuck synthetic leather which is excellent in air permeability and moisture permeability, ideal in yellowing resistance and fine and fluffy in surface.
The invention also aims to provide a preparation method of the wet-process nubuck synthetic leather.
In order to achieve the above objects and other related objects, the present invention provides a wet-process nubuck synthetic leather, comprising: a base fabric composed of a fabric sheet; a surface layer based on an aqueous polyether polyurethane coating composition, said surface layer being located on said substrate, said surface layer having a porosity of 80-90%, said aqueous polyether polyurethane coating composition comprising, 70-85 wt% of an aqueous polyether polyurethane; 5-10 wt% of fiber powder; 3-6 wt% of a first blowing agent; 3-5 wt% of a second foaming agent; 1-3 wt% of a dispersant; 0.5-1.0 wt% of wetting agent; 1-2 wt% of bentonite; wherein the fiber powder consists of 95-97 wt% of cellulose and 3-5 wt% of fatty acid ester.
In one embodiment of the present disclosure, the hydrophilic group content of the waterborne polyether polyurethane is 2 to 3.5 wt%.
In one embodiment of the present disclosure, the waterborne polyether polyurethane coating composition may further include kaolin, wherein the kaolin is present in an amount of 10 to 20 wt%.
In one embodiment of the present disclosure, the first foaming agent is an aqueous solution of a nonionic surfactant having a viscosity of 2000mpa.s or less.
In a specific embodiment disclosed by the invention, the second foaming agent is a microsphere with a core-shell structure, the diameter of the microsphere is 5-20 μm, the shell of the microsphere is a thermoplastic acrylate polymer, and the core is a hydrocarbon.
In a particular embodiment of the present disclosure, the fabric is selected from synthetic, natural or semi-synthetic, natural cellulosic materials.
The invention also provides a preparation method of the wet-process nubuck synthetic leather, which comprises the steps of providing a base cloth formed by fabric pieces; forming a surface layer on the base fabric based on an aqueous polyether polyurethane coating composition, wherein the surface layer has a porosity of 80-90%, and the aqueous polyether polyurethane coating composition comprises 70-85 wt% of aqueous polyether polyurethane; 5-10 wt% of fiber powder; 3-6 wt% of a first blowing agent; 3-5 wt% of a second foaming agent; 1-3 wt% of a dispersant; 0.5-1.0 wt% of wetting agent; 1-2 wt% of bentonite; wherein the fiber powder consists of 95-97 wt% of cellulose and 3-5 wt% of fatty acid ester.
In one embodiment of the present disclosure, the preparation method of the aqueous polyether polyurethane coating composition comprises: adding the waterborne polyurethane into a container, adding the dispersing agent and the second foaming agent under a stirring state, dispersing for 20-60min at a high speed, adding the cellulose and the wetting agent, dispersing for 20-60min, adding the first foaming agent and the bentonite, controlling the foaming ratio within a range of 1-1.5 times, and stirring for 10-30 min.
In one embodiment of the present disclosure, the surface layer based on the waterborne polyether polyurethane coating composition is formed on the base fabric through blade coating and heating steps.
In one embodiment of the present disclosure, the heating temperature of the heating step is 150 ℃ to 250 ℃ for foaming the second foaming agent.
The invention provides wet-process nubuck synthetic leather and a preparation method thereof, wherein the wet-process nubuck synthetic leather is prepared by adhering a surface layer based on a water-based polyether polyurethane coating composition to base cloth, has the porosity of 80-90%, good real leather feeling and velvet feeling, the antistatic pressure reaches 6000-8000mm water column, and the moisture permeability reaches 150-170 g/square meter and 24 h. The water-based polyether polyurethane coating composition provided by the invention comprises water-based polyether polyurethane, fiber powder consisting of 95-97 wt% of cellulose and 3-5 wt% of fatty acid ester, a first foaming agent, a second foaming agent, a dispersing agent, a wetting agent, bentonite and other raw material components, and has the characteristics of air permeability, moisture permeability, yellowing resistance, stability and foaming uniformity. In addition, the preparation method of the wet-process nubuck synthetic leather provided by the invention is simpler, safer, more reliable, environment-friendly, less in steps and high in yield, and has great application value in the industrial development of synthetic leather products.
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Fig. 1 shows a flow chart of a specific embodiment of the preparation method of wet-process nubuck synthetic leather provided by the invention.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the invention.
It is to be understood that the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Unless otherwise specified, "%" and "part(s)" shown in the following examples mean "% by mass" and "part(s) by mass", respectively.
The invention provides a preparation method of wet-process nubuck synthetic leather, which comprises the following steps of, but is not limited to,
s1, providing a base fabric consisting of a piece of fabric;
-S2, forming a surface layer based on an aqueous polyether polyurethane coating composition on said substrate, said surface layer having a porosity of 80-90%, said aqueous polyether polyurethane coating composition comprising:
wherein the fiber powder consists of 95-97 wt% of cellulose and 3-5 wt% of fatty acid ester.
Referring to fig. 1, in step S1, the fabric may be selected from synthetic fiber material, natural or semi-synthetic fiber material, and natural fiber material, and the specific types of the materials may be non-woven fabric, cotton, hemp, silk, polyester, viscose, spandex, nylon, etc. The thickness of the base fabric is not particularly limited, and is, for example, 0.1 to 10mm, for example, 1mm or 2 mm.
The base fabric, for example, a nonwoven fabric, may be treated with a pretreatment solution, for example, an acid solution, which may be selected from hydrochloric acid, sulfuric acid, nitric acid, oxalic acid solution, water washing, drying, and ironing, and the concentration of the acid solution may be 1 to 2%, for example, 1%, from the viewpoint of improving the hand and air permeability of the synthetic leather.
Referring to fig. 1, in step S2, the waterborne polyether urethane is used as the main component of the coating composition, and the waterborne polyether urethane is an aliphatic polyurethane obtained by reacting an aliphatic polyether polyol and a polyisocyanate, and has a solid content of, for example, 38 wt% or more, for example, 40 wt% or 50 wt%, and a viscosity of, for example, 1000cps or less, for example, 800cps or 650 cps. The content of the hydrophilic group of the waterborne polyether polyurethane is 2-3.5 wt%, in the range, the foamed resin is fine and smooth in foam and uniform in foam hole, and can realize good air permeability and velvet feeling, when the content of the hydrophilic group is lower than 2 wt%, the viscosity of the resin is too low, the hardness of a synthetic leather product is low, and when the content of the hydrophilic group is higher than 3.5 wt%, the resin is too high and is not easy to foam. The molecular weight of the aqueous polyether polyurethane influences the foaming performance and the fluffy feeling of the surface, and the molecular weight is 10000-30000g/mol, for example, and the aqueous polyether polyurethane with the molecular weight in the range is ideal for other raw material components, particularly for the encapsulation of the first foaming agent and the second foaming agent, for example. The aqueous polyether polyurethane is present in an amount of 70 to 85 wt%, further, for example, 70 to 80 wt%, such as 70 wt%, 75 wt%, 78 wt%, based on 100 wt% of the coating composition.
Referring next to fig. 1, in step S2, the aqueous polyether polyurethane-based coating composition further includes fiber powder, wherein the fiber powder is contained in an amount of 5-10 wt%, further, for example, 5-8 wt%, such as 5 wt%, 8 wt%, 10 wt%, based on 100 wt% of the coating composition.
It should be noted that the fiber powder provided by the invention is composed of 95-97 wt% of cellulose and 3-5 wt% of fatty acid ester, further, for example, 95-96 wt% of cellulose and 4-5 wt% of fatty acid ester, the fiber powder in the above range has the function of adjusting the micropores of the polyurethane skin layer, and is used for improving the rebound elasticity, the air permeability, the moisture permeability and the thickness retention rate of synthetic leather products, and improving the film forming property, the smoothness, the high flame retardance and the yellowing resistance.
Specific examples of the cellulose include hydroxypropyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose, ethyl cellulose, cellulose acetate butyrate, cellulose acetate phthalate, cellulose acetate succinate, cellulose acetate propionate, cellulose acetate trimellitate, hydroxypropyl methyl cellulose phthalate, hydroxypropyl methyl cellulose succinate, cellulose acetate succinate butyrate, cellulose acetate succinate propionate, sodium carboxymethyl cellulose, and cellulose butyrate.
Specific examples of the fatty acid ester include glycerin fatty acid ester, polyglycerin fatty acid ester, and sucrose fatty acid ester.
Referring next to fig. 1, in step S2, the aqueous polyether polyurethane-based coating composition further includes a first foaming agent, which is an aqueous solution of a nonionic surfactant having a viscosity of 2000mpa.s or less, such as fatty acids, ammonium salts, and sodium succinates, and further having a viscosity of 1500mpa.s or less, such as 1000mpa.s and 1200mpa.s, a solid content of more than 28 wt%, such as 30 wt%, and a pH of 5 to 10, such as 6. The aqueous solution of the nonionic surfactant contains functional groups such as hydroxyl groups, and can react with the aqueous polyether polyurethane to generate an internal crosslinking agent, so that the aqueous polyether polyurethane coating composition can be tightly combined with each other after being cured at high temperature, the peeling strength is high, the cells are finer, and the scratch resistance is good, the first foaming agent can be foamed by machinery, for example, the foaming ratio is 1-2 times, further, for example, 1-1.5 times, for example, 1, 1.3, and 1.5 times. The first blowing agent is present in an amount of 3 to 6 wt%, further, for example, 3.2 to 5.8 wt%, such as 3.2 wt%, 3.5 wt%, 4.2 wt%, 4.5 wt%, 5 wt%, 6 wt%, based on 100 wt% of the coating composition.
Referring to fig. 1, in step S2, the aqueous polyether polyurethane-based coating composition further includes a second foaming agent, where the second foaming agent is a microsphere having a core-shell structure, the diameter of the microsphere is 5-20 μm, the outer shell of the microsphere is a thermoplastic acrylate polymer, and the inner core is a hydrocarbon. The second foaming agent may be foamed, for example, by heating, and the foaming temperature and the foaming time of the second foaming agent are related to the diameter of the microspheres of the second foaming agent, and when the diameter of the microspheres is in the range of 5 to 10 μm, further, for example, 6 to 9 μm, the foaming temperature is 150-. When the diameter of the microsphere is 10-20 μm, further, for example, in the range of 10-16 μm, the foaming temperature is 190-. The first blowing agent is present in an amount of 3 to 5 wt%, further, for example, 3.3 to 5 wt%, such as 3.3 wt%, 3.5 wt%, 4 wt%, 4.5 wt%, 5 wt%, based on 100 wt% of the coating composition.
Referring next to fig. 1, in the step S2, the aqueous polyether-based polyurethane coating composition further includes a dispersant, which is a surfactant, for dispersing the plurality of raw material components, and the dispersant may be selected, for example, from ionic and/or nonionic dispersants, and further, from the viewpoint of improving dispersibility, from the group consisting of ammonium salts and sodium salts, and specific examples may be sodium salts and ammonium salts of acrylic resins, acryl copolymer resins, and condensation products of polycarbonic acid and aromatic sulfonate and formalin. The dispersant is present in an amount of 1 to 3 wt%, further, for example, 2 to 3 wt%, such as 1.5 wt%, 2 wt%, 2.5 wt%, based on 100 wt% of the coating composition.
Referring next to fig. 1, in step S2, the aqueous polyether polyurethane-based coating composition further includes a wetting agent, which may be selected from, for example, silicone modified wetting agents, for reducing the surface tension of the plurality of stock components while wetting the stock components. The wetting agent is present in an amount of 0.5 to 1.0 wt%, further, e.g., 0.8 to 1.0 wt%, e.g., 0.8 wt%, 1.0 wt%, based on 100 wt% of the coating composition.
Referring next to fig. 1, in step S2, the aqueous polyether polyurethane-based coating composition further includes bentonite, which has thixotropy and can be thickened and prevented from settling in the aqueous polyether polyurethane-based coating composition provided by the present invention, and when used in combination with the first foaming agent and/or the second foaming agent, the foaming uniformity is not affected. The bentonite may be present in an amount of 1 to 2 wt%, further, for example 1.2 to 2 wt%, such as 1.2 wt%, 1.5 wt%, based on 100 wt% of the coating composition.
It should be noted that the coating composition based on the waterborne polyether polyurethane may further include kaolin, and in the coating composition provided by the present invention, the kaolin is calcined kaolin with 1000-2000 mesh, such as 1250-1300 mesh, the content of the kaolin with particle size less than 2 μm is more than 80%, further more, more than 90%, the oil absorption is less than 60g/100g, and the oil absorption in the above range is ideal for the foaming state and the foam uniformity and stability. The kaolin is present in an amount of 10 to 20 wt%, further, for example, 10 to 15 wt%, such as 10 wt%, 13 wt%, 15 wt%.
Referring next to fig. 1, in step S2, the waterborne polyether polyurethane-based coating composition may be prepared, for example, by the following process: adding water-based polyether polyurethane into a container, stirring for example at the speed of 400 plus materials for 1000r/min, adding a dispersing agent and a second foaming agent, dispersing for 20-60min at a high speed, adding fiber powder and a wetting agent, dispersing for 20-60min, adding a first foaming agent and bentonite, synchronously observing the foaming condition of the liquid surface, generally foaming for 1.0-1.5 times, and then stirring for 10-30min at a low speed for foam stabilization.
Referring to fig. 1, in step S2, the surface layer of the aqueous polyether polyurethane coating composition is formed on the base fabric through a blade coating and heating step, and specifically, in an embodiment of the present invention, the aqueous polyether polyurethane coating composition is scraped onto the base fabric to a thickness of, for example, 80-200S, for example, 100S, and then the base fabric coated with the aqueous polyether polyurethane coating composition is placed into a coagulation tank to be coagulated for 3-5min, and is washed with water, extruded, dried at, for example, 110-. The surface layer of the aqueous polyether polyurethane-based coating composition provided by the present invention has a thickness of, for example, 0.4 to 0.6mm, further, a thickness of, after the secondary foaming, 0.6 to 0.8mm and has micropores, and a porosity of 80 to 90%, for example, 80%, 90%.
Further, based on the improvement of the fine and smooth velvet feeling and touch feeling of the synthetic leather surface, the synthetic leather after secondary foaming can be subjected to leather grinding by using a 150-mesh and/or 320-mesh double grinding head, and the surface is subjected to color changing treatment by using a three-plate machine, so that a superfine greasy velvet feeling synthetic leather product is obtained.
The invention is further illustrated by the following examples. It should be understood that the examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Modifications and adaptations of the present invention within the scope of the claims may occur to those skilled in the art and are intended to be within the scope and spirit of the present invention.
In one embodiment of the present invention:
providing a non-woven fabric base cloth, and sequentially carrying out 1% hydrochloric acid treatment, water washing, drying and ironing on the base cloth for later use.
And (2) coating and scraping the water-based polyether polyurethane coating composition on the treated base cloth, wherein the coating thickness is 100S, then putting the scraped base cloth into a solidification tank for solidification for 3min, and the solidification process is free from orange peel and cracking, washing after solidification, extruding, drying at 110 ℃, drying the dried leather sample, then putting the leather sample into an oven for secondary foaming at 168 ℃ for 40S, directly grinding the leather by using a 150-mesh and 320-mesh double grinding head after secondary foaming, and finally changing the color by using a three-plate machine to treat the surface touch feel to obtain the superfine greasy-velvet-feeling water-based nubuck leather.
Wherein the waterborne polyether polyurethane-based coating composition is prepared by the following method: 75g of waterborne polyurethane (40 wt%, 800cps, hydrophilic group content of 2 wt%, molecular weight of 10000g/mol) is added into a container, 2g of dispersing agent (sodium acrylate), 10g of kaolin (1000 meshes, average particle size of 1.8 mu m accounts for 85%), 3g of second foaming agent (average particle size of 6 mu m) are added under the stirring condition of 400r/min, after high-speed dispersion is carried out for 20min at 1000r/min, 5g of fiber powder (95 wt% of hydroxyethyl cellulose and 5 wt% of glycerin fatty acid ester) and 1g of wetting agent (organic silicon modified wetting agent) are added for dispersion for 20min, then 3g of first foaming agent (1000mPa.s, PH 6, solid content of 30%) and 1g of bentonite are added, the liquid level foaming condition is synchronously observed, generally foaming is carried out for 1.0, and then, low-speed stirring is carried out for 10min, so as to obtain the waterborne polyether-based polyurethane coating composition.
And (3) performance detection:
the superfine greasy velvet water-based nubuck synthetic leather product is subjected to a water impermeability test (GB/T-4744-1997), the antistatic water pressure is 8000 water columns, and the air permeability test (GB/T5453-1997) shows that the air permeability is 170 g/square meter, 24h, 2 ten thousand Martindale wear resistance, good scratch resistance (10 times of scratching with a nail, no shedding and damage), and 100 times of dry and wet rubbing color test without fading (900g weight detection) and fine and smooth apparent velvet feeling.
In another embodiment of the invention:
providing a non-woven fabric base cloth, and sequentially carrying out 1% hydrochloric acid treatment, water washing, drying and ironing on the base cloth for later use.
And (2) coating and scraping the water-based polyether polyurethane coating composition on the treated base cloth, wherein the coating and scraping thickness is 120S, then putting the scraped base cloth into a solidification tank for solidification for 5min, and the solidification process is free from orange peel and cracking, after solidification, washing, extruding, drying at 115 ℃, drying the dried leather sample, then putting the leather sample into an oven for secondary foaming at the temperature of 206 ℃ for 60S, directly grinding the leather by using a 150-mesh and 320-mesh double grinding head after secondary foaming, and finally changing the color by using a three-plate machine to treat the surface touch, thereby obtaining the superfine oily wool-feeling water-based nubuck synthetic leather.
Wherein the waterborne polyether polyurethane-based coating composition is prepared by the following method: 70g of waterborne polyurethane is added into a container, 2.5g of dispersing agent (sodium acrylate), 10g of kaolin (2000 meshes, the average particle size of 1.8 mu m accounts for 90 percent) and 4g of second foaming agent (the average particle size of 12 mu m) are added under the stirring condition of 400r/min, after high-speed dispersion is carried out for 30min at 1100r/min, 8g of fiber powder (96wt percent of hydroxyethyl cellulose and 4wt percent of glycerin fatty acid ester) and 1g of wetting agent (organic silicon modified wetting agent) are added for dispersion for 40min, then 3g of first foaming agent (800mPa.s, PH 6, solid content of 30 percent) and 1.5g of bentonite are added, the liquid level foaming condition is synchronously observed, generally 1.0 foaming is carried out, and then low-speed stirring is carried out for 10min for foam stabilization, so as to obtain the waterborne polyether-based polyurethane coating composition.
And (3) performance detection:
the superfine greasy velvet water-based nubuck synthetic leather product is subjected to a water impermeability test (GB/T-4744-1997), the antistatic water pressure is 7000 water columns, and the air permeability test (GB/T5453-1997) shows that the air permeability is 165 g/square meter, 24h, 2 ten thousand Martindale wear-resistant times, the scratch resistance is good (10 times of scratching with a fingernail, no shedding and damage), and the dry and wet rubbing resistance is 100 times of test cloth without fading (900g of weight detection), and the apparent velvet feeling is fine.
In another embodiment of the invention:
providing a non-woven fabric base cloth, and sequentially carrying out 1% hydrochloric acid treatment, water washing, drying and ironing on the base cloth for later use.
And (2) coating and scraping the water-based polyether polyurethane coating composition on the treated base cloth, wherein the coating thickness is 105S, then putting the scraped base cloth into a solidification tank for solidification for 5min, and the solidification process is free from orange peel and cracking, after solidification, washing, extruding, drying at 115 ℃, drying the dried leather sample, then putting the leather sample into an oven for secondary foaming at the temperature of 200 ℃ for 60S, directly grinding the leather by using a 150-mesh and 320-mesh double grinding head after secondary foaming, and finally changing the color by using a three-plate machine to treat the surface touch feel to obtain the superfine oily wool-feeling water-based nubuck synthetic leather.
Wherein the waterborne polyether polyurethane-based coating composition is prepared by the following method: adding 78g of waterborne polyurethane into a container, adding 1g of dispersing agent (sodium acrylate), 10g of kaolin (2000 meshes, the average particle size of 1.6 mu m accounts for 90 percent), 3g of second foaming agent (the average particle size of 12 mu m) under the stirring condition of 500r/min, after dispersing at a high speed of 1100r/min for 30min, adding 3g of fiber powder (96wt percent of hydroxyethyl cellulose and 4wt percent of glycerin fatty acid ester) and 1g of wetting agent (organic silicon modified wetting agent) for dispersing for 40min, then adding 3g of first foaming agent (800mPa.s, PH 6, solid content of 30 percent) and 1g of bentonite, synchronously observing the foaming condition of the liquid level, generally foaming for 1.5, and then stirring at a low speed for 10min for stabilizing the foam to obtain the waterborne polyether-based polyurethane coating composition.
And (3) performance detection:
the superfine greasy velvet feeling water-based nubuck synthetic leather product is subjected to a water impermeability test (GB/T-4744-1997), the antistatic water pressure is 8000 water columns, and the air permeability test (GB/T5453-1997) shows that the air permeability is 168 g/square meter, 24h, the martindale is wear-resistant for 2 ten thousand times, the scratch resistance is good (10 times of scratching with a nail, no shedding and damage exists), and the dry and wet rubbing resistance is 100 times of test cloth without fading (900g of weight measurement), and the apparent velvet feeling is fine and smooth.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. The wet-process nubuck synthetic leather is characterized by comprising the following components in parts by weight:
a base fabric composed of a fabric sheet;
a surface layer based on an aqueous polyether polyurethane coating composition, said surface layer being located on said substrate, said surface layer having a porosity of 80-90%, said aqueous polyether polyurethane coating composition comprising,
wherein the fiber powder consists of 95-97 wt% of cellulose and 3-5 wt% of fatty acid ester.
2. The wet-process nubuck synthetic leather of claim 1, wherein the hydrophilic group content of the waterborne polyether polyurethane is 2-3.5 wt%.
3. The wet-process nubuck synthetic leather of claim 1, wherein the aqueous polyether polyurethane coating composition further comprises kaolin, and the kaolin is 10-20 wt%.
4. The wet-process nubuck leather of claim 1, wherein the first foaming agent is an aqueous solution of a non-ionic surfactant having a viscosity of 2000mpa.s or less.
5. The wet-process nubuck leather of claim 1, wherein the second foaming agent is a microsphere with a core-shell structure, the diameter of the microsphere is 5-20 μm, the shell of the microsphere is a thermoplastic acrylate polymer, and the core is a hydrocarbon.
6. The wet-process nubuck leather of claim 1, wherein the fabric is selected from the group consisting of synthetic, natural or semi-synthetic, and natural cellulosic materials.
7. A preparation method of wet-process Yangbuck synthetic leather is characterized by comprising the following steps,
providing a base fabric formed by fabric pieces;
forming a surface layer based on an aqueous polyether polyurethane coating composition on said substrate, said surface layer having a porosity of 80-90%, said aqueous polyether polyurethane coating composition comprising,
wherein the fiber powder consists of 95-97 wt% of cellulose and 3-5 wt% of fatty acid ester.
8. The preparation method of the wet-process nubuck synthetic leather according to claim 7, wherein the preparation method of the water-based polyether polyurethane coating composition comprises the following steps: adding the waterborne polyurethane into a container, adding the dispersing agent and the second foaming agent under a stirring state, dispersing for 20-60min at a high speed, adding the cellulose and the wetting agent, dispersing for 20-60min, adding the first foaming agent and the bentonite, controlling the foaming ratio within a range of 1-1.5 times, and stirring for 10-30 min.
9. The method for preparing Yangbuck synthetic leather by a wet method according to claim 7, wherein the surface layer based on the water-based polyether polyurethane coating composition is formed on the base fabric by blade coating and heating steps.
10. The preparation method of the wet-process nubuck synthetic leather as claimed in claim 9, wherein the heating temperature of the heating step is 150-250 ℃ for foaming the second foaming agent.
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