CN113152110A - Environment-friendly polyurethane synthetic leather for sofa furniture and preparation method thereof - Google Patents
Environment-friendly polyurethane synthetic leather for sofa furniture and preparation method thereof Download PDFInfo
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- CN113152110A CN113152110A CN202110541526.0A CN202110541526A CN113152110A CN 113152110 A CN113152110 A CN 113152110A CN 202110541526 A CN202110541526 A CN 202110541526A CN 113152110 A CN113152110 A CN 113152110A
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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
- D06N3/0045—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 applying a ready-made foam layer; obtained by compressing, crinkling or crushing a foam layer, e.g. Kaschierverfahren für Schaumschicht
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
- C08G18/3225—Polyamines
- C08G18/3234—Polyamines cycloaliphatic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4854—Polyethers containing oxyalkylene groups having four carbon atoms in the alkylene group
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
- C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
- C08G18/6666—Compounds of group C08G18/48 or C08G18/52
- C08G18/667—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38
- C08G18/6681—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/32 or C08G18/3271 and/or polyamines of C08G18/38
- C08G18/6685—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/32 or C08G18/3271 and/or polyamines of C08G18/38 with compounds of group C08G18/3225 or polyamines of C08G18/38
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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
- 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
- D06N2203/00—Macromolecular materials of the coating layers
- D06N2203/06—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D06N2203/068—Polyurethanes
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- 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
- D06N2205/00—Condition, form or state of the materials
- D06N2205/04—Foam
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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
- D06N2209/10—Properties of the materials having mechanical properties
- D06N2209/105—Resistant to abrasion, scratch
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- D06N2209/00—Properties of the materials
- D06N2209/16—Properties of the materials having other properties
- D06N2209/1607—Degradability
- D06N2209/1621—Water-soluble, water-dispersible
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- D06N2209/00—Properties of the materials
- D06N2209/16—Properties of the materials having other properties
- D06N2209/1685—Wear resistance
Abstract
The application relates to the technical field of synthetic leather, and particularly discloses polyurethane synthetic leather for green environment-friendly sofa furniture and a preparation method thereof. The preparation method of the polyurethane synthetic leather for the environment-friendly sofa furniture comprises the following steps: step 1) preparing waterborne polyurethane; step 2) preparing surface layer slurry; step 3) preparing foaming layer slurry; step 4), pretreating base cloth; step 5), preparing the polyurethane synthetic leather for the environment-friendly sofa furniture; step 5-1) preparing a surface layer; step 5-2) preparing synthetic leather bass; and 5-3) attaching. The polyurethane synthetic leather for the environment-friendly sofa furniture can be used for manufacturing sofas, furniture and the like, is environment-friendly, has less environmental pollution in the production process, and has excellent hydrolysis resistance, and the conditions of deformation, swelling, surface fracture and the like are not easy to occur.
Description
Technical Field
The application relates to the technical field of synthetic leather manufacturing, in particular to a polyurethane synthetic leather for green environment-friendly sofa and a preparation method thereof.
Background
With the improvement of the living standard of human beings, the requirements of people on various foods and articles in life are gradually improved, and for taking the sofa, because people pursue the surface softness of the sofa, the polyurethane synthetic leather has soft hand feeling, good elasticity and higher similarity with genuine leather, the artificial leather is used for replacing the genuine leather more and more in the furniture industry, particularly on the sofa, so the polyurethane synthetic leather gradually enters the life of people.
The polyurethane synthetic leather adopted in the furniture market at present mainly adopts solvent type polyurethane as a main material, the solvent type polyurethane mainly adopts solvents such as DME and the like to prepare polyurethane, but most of the solvent type polyurethane is gradually replaced by waterborne polyurethane for environmental protection, and then the synthetic leather prepared from the waterborne polyurethane is made into furniture articles such as sofas and the like.
The inventor considers that the sofa made of the polyurethane synthetic leather has poor hydrolysis resistance and the surface is easy to crack after daily cleaning, and needs further improvement.
Disclosure of Invention
In order to improve the hydrolysis resistance of polyurethane synthetic leather, the application provides a polyurethane synthesis for environment-friendly sofa furniture and a preparation method thereof.
In a first aspect, the application provides a preparation method for synthesizing polyurethane for environment-friendly sofa furniture, which adopts the following technical scheme:
a preparation method for synthesizing polyurethane for environment-friendly sofa furniture comprises the following steps:
step 1) preparation of waterborne polyurethane:
step 1-1), adding 5-20 parts by mass of polytetrahydrofuran ether glycol and 5-15 parts by mass of dicyclohexylmethane diisocyanate into a container, heating to 80-100 ℃, and reacting for 3-4h to obtain a prepolymer;
step 1-2) cooling to 50-60 ℃, adding 0.5-5 parts by mass of isophorone diamine, 0.5-5 parts by mass of N-methyldiethanolamine, 0.1-0.3 part of catalyst and 5-15 parts of solvent, and preserving heat for 2-3 hours to obtain a mixed solution;
step 1-3), cooling to 20-50 ℃, adding 0.5-1 part by mass of a salt forming agent and 50-70 parts by mass of deionized water, and stirring for 30-50min to obtain waterborne polyurethane;
step 2) preparing surface layer slurry: adding 10-40 parts by mass of the waterborne polyurethane prepared in the step 1), adding 0.2-0.5 part by mass of a water-soluble acrylic thickener, 0.2-0.5 part by mass of an organic silicon defoamer, 0.5-1 part by mass of a leveling agent and 0.2-0.5 part by mass of a cross-linking agent, uniformly stirring, centrifugally defoaming, and standing to obtain a surface layer slurry;
step 3) preparing foaming layer slurry: adding 10-40 parts by mass of the waterborne polyurethane prepared in the step 1), 1-5 parts by mass of a foaming agent, 0.05-5 parts by mass of a thickening agent, 1-5 parts by mass of a foam stabilizer, 0.05-5 parts by mass of a fluorine modified polyacrylate copolymer and 0.05-5 parts by mass of amino resin, uniformly stirring, and mechanically foaming for 30-40min to obtain foaming layer slurry;
step 4), base cloth pretreatment: padding the base cloth with a softening agent, drying and ironing to obtain pretreated base cloth;
step 5), preparing the polyurethane synthetic leather for the environment-friendly sofa furniture:
step 5-1) preparing a surface layer: coating the surface layer sizing agent on release paper by scraping; baking at 60-70 deg.C for 5-8min, transferring into oven at 90-100 deg.C, and baking for 20-25min to obtain surface layer;
step 5-2) preparing synthetic leather bass: spreading the foaming layer slurry on the pretreated base cloth, baking at 60-70 deg.C for 15-20min, and oven-drying in oven at 90-100 deg.C for 30-40min to obtain synthetic leather Bass;
step 5-3), attaching: and (3) coating adhesive on the surface layer, baking in an oven at 90-100 ℃ for 2-5min, taking out, attaching the obtained product to the synthetic leather bass, and drying to obtain the environment-friendly polyurethane synthetic leather for sofa furniture.
By adopting the technical scheme, as polytetrahydrofuran ether glycol, dicyclohexylmethane diisocyanate, isophorone diamine and N-methyldiethanolamine are compounded, and through prepolymerization reaction, chain extension reaction and emulsification reaction, the prepared waterborne polyurethane has excellent performance, is beneficial to improving the hydrolysis resistance of the prepared polyurethane synthetic leather for the environment-friendly sofa furniture, does not need to be additionally added with hydrolysis-resistant auxiliaries, and has better physical properties, so that the sofa, furniture and the like prepared by using the polyurethane synthetic leather for the environment-friendly sofa furniture are not easy to deform, bulge, crack on the surface and the like in daily clean weather.
Preferably, in the step 1-2), the catalyst is one or more of stannous octoate, potassium acetate and bismuth isooctanoate.
By adopting the technical scheme, the catalyst adopts one or more of stannous octoate, potassium acetate and bismuth isooctanoate, so that in the process of preparing the waterborne polyurethane, the coordination between isophorone diamine, N-methyldiethanolamine, polytetrahydrofuran ether glycol and dicyclohexylmethane diisocyanate is facilitated to be promoted, the reaction is more thorough, the performance of the obtained waterborne polyurethane is more excellent, the hydrolysis resistance of the prepared polyurethane synthetic leather for the environment-friendly sofa furniture is further facilitated to be improved, and the phenomena of cracking and peeling of the prepared polyurethane synthetic leather for the environment-friendly sofa furniture are not easy to occur.
Preferably, in the step 2), the cross-linking agent is trimethylolpropane or diethylenetriamine, and the weight ratio of the cross-linking agent to the trimethylolpropane to the diethylenetriamine is in the range of 1: (2-5) in a mass ratio.
By adopting the technical scheme, the adopted cross-linking agent is the mixture of the trimethylolpropane and the diethylenetriamine according to a specific mass ratio, which is beneficial to promoting the cross-linking coordination of the aqueous polyurethane and other raw materials, improving the hydrolysis resistance of the surface layer slurry, further improving the hydrolysis resistance of the prepared polyurethane synthetic leather for the environment-friendly sofa furniture and reducing the phenomenon of surface crust breaking of the sofa.
Preferably, in the step 3), the foam stabilizer is one or two of polyacrylamide and sodium dodecyl benzene sulfonate.
By adopting the technical scheme, one or two of polyacrylamide and sodium dodecyl benzene sulfonate are used as the foam stabilizer, so that foam can be remarkably stabilized in the foaming process, the flowability of the foam is reduced, the viscosity of slurry of the foaming layer is improved, the bonding force between the foaming layer and the base cloth is stronger, and the hydrolysis resistance of the prepared environment-friendly polyurethane synthetic leather for sofa furniture is further improved.
Preferably, in the step 4), before padding the base fabric, the base fabric is washed with water, the organic acid finishing agent is added into the water, and 60-80g of the organic acid finishing agent is added into each liter of water.
Through adopting above-mentioned technical scheme, utilize organic acid finishing agent to arrange in order the base cloth earlier before the base cloth padding is handled, organic acid part ionization, thereby there is one deck protection film on the base cloth surface, make the compliance of base cloth better, further promote the softener to adsorb on the base cloth surface, when preparing synthetic leather bass, there is better adhesive force to the foaming layer thick liquids, make the foaming layer thick liquids be difficult for droing, reduce the hydrolysis resistance of polyurethane synthetic leather for green sofa furniture, make the sofa, furniture etc. that polyurethane synthetic leather for green sofa furniture prepared the difficult fracture condition that appears in daily cleanness in the surface.
Preferably, in the step 4), the padding treatment of the base fabric adopts a two-soaking and two-rolling treatment mode, the rolling residual rate of the two-soaking and two-rolling is 60-70%, and the base fabric is dried at the temperature of 120-.
By adopting the technical scheme, the base cloth is treated by two-dipping and two-rolling, so that the fusion of the base cloth and the softening agent is further improved, the softening agent can be better covered on the surface of the base cloth, the base cloth is softer, and the adsorption capacity is better. When the base cloth is used for preparing the synthetic leather bass, the bonding force between the base cloth and the foaming layer slurry is better, the foaming layer slurry is not easy to separate from the base cloth, the hydrolysis resistance of the prepared environment-friendly polyurethane synthetic leather for sofa furniture is further enhanced, and the phenomena of sofa deformation, sofa bulging and sofa surface cracking are reduced.
Preferably, in the step 5-3), the synthetic leather bass water-based surface treatment agent is subjected to roller coating twice before attaching, wherein the first roller coating amount is 10-12g/m2, the second roller coating amount is 18-20g/m2, and the synthetic leather bass water-based surface treatment agent is dried at 80-100 ℃.
By adopting the technical scheme, the water-based treating agent for the synthetic leather bass before being attached is subjected to roller coating twice, so that the synthetic leather bass has excellent water resistance, better skin feel is achieved, the situations of easy leaving of marks after touch and scratch are reduced, the synthetic leather bass has better wear resistance and hydrolysis resistance, and the situations of cracking, peeling and the like are not easy to occur.
In a second aspect, the application provides a polyurethane synthetic leather for green sofa furniture, which adopts the following technical scheme:
the polyurethane synthetic leather for the environment-friendly sofa furniture is prepared by the preparation method of the polyurethane synthetic leather for the environment-friendly sofa furniture.
By adopting the technical scheme, polytetrahydrofuran ether glycol, dicyclohexylmethane diisocyanate, isophorone diamine and N-methyldiethanolamine are compounded, and the waterborne polyurethane generated by the series of reactions with other raw materials has better hydrolysis resistance, so that the prepared polyurethane synthetic leather for the environment-friendly sofa furniture has better hydrolysis resistance after the prepared surface layer slurry and foaming layer slurry are attached to the base cloth, and the prepared sofa is not easy to deform, bulge, crack and the like on the surface in the daily use process and after daily cleaning.
In summary, the present application has the following beneficial effects:
1. according to the preparation method, polytetrahydrofuran ether glycol, dicyclohexylmethane diisocyanate, isophorone diamine and N-methyldiethanolamine are compounded, and a series of reactions are performed under the catalytic crosslinking effect, so that the hydrolysis resistance of the prepared polyurethane synthetic leather for the environment-friendly sofa furniture is improved, and no hydrolysis-resistant auxiliary agent is added, so that the conditions of deformation, swelling, surface fracture and the like of the surfaces of sofas, furniture and the like prepared from the polyurethane synthetic leather for the environment-friendly sofa furniture are not easy to occur in daily cleaning.
2. In the application, the base cloth is preferably treated by adopting the organic acid finishing agent, and the organic acid is partially ionized, so that a layer of protective film is attached to the surface of the base cloth, then the base cloth is padded by utilizing the softening agent, the fusion of the base cloth and the softening agent is further improved, the softening agent can better cover the surface of the base cloth, the hydrolysis resistance of the prepared polyurethane synthetic leather for the environment-friendly sofa furniture is further enhanced, and the phenomena of sofa deformation, sofa bulging and surface fracture are reduced.
3. The application prefers to carry out roller coat twice with aqueous finishing agent before the laminating for synthetic leather bass, gives synthetic leather bass excellent water resistance characteristics, has better skin feel, reduces the condition of easily leaving the vestige behind touch, the scratch for synthetic leather bass has better wearability, hydrolysis resistance, difficult production condition such as fracture, peeling off.
Detailed Description
The present application will be described in further detail with reference to examples.
The information on the source of each component used in the following examples and comparative examples is detailed in Table 1.
TABLE 1
Example 1
Step 1) preparation of waterborne polyurethane:
step 1-1), adding 5kg of polytetrahydrofuran ether glycol and 15kg of dicyclohexylmethane diisocyanate into a reaction kettle, heating to 80 ℃, and reacting for 4 hours to obtain a prepolymer;
step 1-2) cooling to 50 ℃, adding 0.5kg of isophorone diamine, 0.5kg of N-methyldiethanolamine, 0.1kg of catalyst and 5kg of solvent, and keeping the temperature for 3 hours to obtain a mixed solution;
in this example, the catalyst was dibutyltin dilaurate; the solvent is ethyl acetate;
step 1-3), cooling to 20 ℃, adding 0.5kg of a salt forming agent and 50kg of deionized water, and stirring for 30min to obtain waterborne polyurethane;
in this example, the salt former is triethylamine;
step 2) preparing surface layer slurry: adding 10kg of waterborne polyurethane, adding 0.2kg of water-soluble acrylic thickener, 0.2kg of organic silicon defoamer, 0.5kg of leveling agent and 0.2kg of crosslinking agent, stirring at the temperature of 25 ℃ and the rotating speed of 3000r/min, carrying out centrifugal defoaming for 10min, and standing for 30min to obtain surface layer slurry;
in this example, the cross-linking agent is glycerol;
step 3) preparing foaming layer slurry: adding 10kg of waterborne polyurethane, 1kg of foaming agent, 0.05kg of thickening agent, 1kg of foam stabilizer, 0.05kg of fluorine modified polyacrylate copolymer and 0.05kg of amino resin, stirring at the rotating speed of 3000r/min, and mechanically foaming for 30min to obtain foaming layer slurry;
in the embodiment, the thickener is a nonionic polyurethane thickener, and the foam stabilizer is alkylolamide;
step 4), base cloth pretreatment: padding the base cloth with a softening agent on a uniform padder, soaking for 10min, wherein the rolling residual rate is 70%, drying in a heat setting machine at 120 ℃, and ironing to obtain pretreated base cloth;
in this embodiment, the softener is an amino-modified silicone softener;
step 5), preparing the polyurethane synthetic leather for the environment-friendly sofa furniture:
step 5-1) preparing a surface layer: spreading the surface layer slurry on release paper, spreading to a thickness of 0.6mm, baking at 60 deg.C for 8min, transferring into a 90 deg.C oven, and baking for 25min to obtain surface layer;
step 5-2) preparing synthetic leather bass: scraping and coating the foaming layer slurry on the pretreated base cloth, wherein the scraping and coating thickness is 0.6mm, baking at 60 ℃ for 20min, and transferring into a baking oven at 90 ℃ for baking for 40min to obtain the synthetic leather bass;
step 5-3), attaching: and (3) coating adhesive on the surface layer, baking for 5min at 90 ℃ in an oven, taking out, attaching the surface layer to the synthetic leather bass, and baking for 10min at 120 ℃ in the oven to obtain the environment-friendly polyurethane synthetic leather for sofa furniture.
Example 2
In the step 1-1), the adding amount of polytetrahydrofuran ether glycol is 20kg, the adding amount of dicyclohexyl methane diisocyanate is 5kg, the temperature is heated to 100 ℃, and the reaction is carried out for 3 h;
in the step 1-2), the addition amount of isophorone diamine is 5kg, and the addition amount of N-methyldiethanolamine is 5 kg;
in the step 1-3), cooling to 50 ℃, and stirring for 50 min;
in the step 2), the adding amount of the waterborne polyurethane is 40kg, the adding amount of the waterborne acrylic thickener is 0.5kg, the adding amount of the organic silicon defoamer is 0.5kg, the adding amount of the leveling agent is 1kg, and the adding amount of the crosslinking agent is 0.5 kg;
in step 3), the amount of the aqueous polyurethane added was 40kg, the amount of the blowing agent added was 5kg, the amount of the thickener added was 5kg, the amount of the foam stabilizer added was 5kg, the amount of the fluorine-modified polyacrylate copolymer added was 5kg, and the amount of the amino resin added was 5 kg.
Example 3
In the step 1-1), the addition amount of polytetrahydrofuran ether glycol is 15kg, and the addition amount of dicyclohexylmethane diisocyanate is 10 kg;
in the step 1-2), the temperature is reduced to 60 ℃, the addition amount of isophorone diamine is 2.5kg, the addition amount of N-methyldiethanolamine is 2.5kg, and the temperature is kept for 2 h.
Example 4
Compared with example 3, the difference is only that:
the catalyst is stannous octoate.
Example 5
Compared with example 3, the difference is only that:
the catalyst consists of 0.05kg of stannous octoate, 0.03kg of potassium acetate and 0.02kg of bismuth isooctanoate.
Example 6
Compared with example 3, the difference is only that:
the cross-linking agent consists of trimethylolpropane and diethylenetriamine according to the mass ratio of 1: 2.
Example 7
Compared with example 3, the difference is only that:
the cross-linking agent consists of trimethylolpropane and diethylenetriamine according to the mass ratio of 1: 5.
Example 8
Compared with example 3, the difference is only that:
the cross-linking agent is composed of trimethylolpropane and glycerol according to the mass ratio of 1: 5.
Example 9
Compared with example 3, the difference is only that:
the cross-linking agent consists of triethanolamine and diethylenetriamine according to the mass ratio of 1: 5.
Example 10
Compared with example 3, the difference is only that:
the foam stabilizer is polyacrylamide.
Example 11
Compared with example 3, the difference is only that:
the foam stabilizer consists of 0.5kg of sodium dodecyl benzene sulfonate and 0.5kg of polyacrylamide.
Example 12
Compared with example 3, the difference is only that:
in the step 4), before padding treatment of the base fabric, firstly, rinsing the base fabric, adding an organic acid finishing agent into water, and adding 60g of the organic acid finishing agent into per liter of water;
in this example, the organic acid finish was acetic acid;
in the step 5-3), before the laminating, the synthetic leather base is subjected to roller coating twice by using the water-based surface treating agent, wherein the first roller coating amount is 10g/m2The second roll coating amount was 18g/m2And drying at 80 ℃.
Example 13
Compared with example 3, the difference is only that:
in the padding treatment in the step 4), the base cloth is padded with the softening agent on a uniform padder, the first time of soaking is 5min, the second time of soaking is 3min, the rolling residue rate is 60%, and after the base cloth is pre-dried in a heat setting machine at 120 ℃ for 3min, the base cloth is adjusted to 140 ℃ and is baked for 2 min.
Example 14
Compared with example 3, the difference is only that:
in the step 4), before padding treatment of the base fabric, firstly, rinsing the base fabric, adding an organic acid finishing agent into water, adding 60g of the organic acid finishing agent into each liter of water, then padding the base fabric with a softener on an even padder, wherein the first soaking time is 5min, the second soaking time is 3min, the rolling residual rate is 60%, and after pre-drying for 3min at 120 ℃ in a heat setting machine, adjusting to 140 ℃ and baking for 2 min;
in this example, the organic acid finish was acetic acid;
in the step 5-3), before the laminating, the synthetic leather base is subjected to roller coating twice by using the water-based surface treating agent, wherein the first roller coating amount is 12g/m2The second roll coating amount was 20g/m2And drying at 100 ℃.
Example 15
Compared with example 3, the difference is only that:
in the step 4), before padding treatment of the base fabric, firstly, rinsing the base fabric, adding an organic acid finishing agent into water, adding 60g of the organic acid finishing agent into each liter of water, then padding the base fabric with a softener on an even padder, wherein the first soaking time is 5min, the second soaking time is 3min, the rolling residual rate is 60%, and after pre-drying for 3min at 120 ℃ in a heat setting machine, adjusting to 140 ℃ and baking for 2 min;
in this example, the organic acid finish was acetic acid;
in the step 5-1), the baking is carried out at 70 ℃ for 5min, and the baking is carried out at 100 ℃ for 20 min;
in the step 5-2), the baking is carried out at 70 ℃ for 15min, and the baking is carried out at 100 ℃ for 30 min;
in the step 5-3), before the laminating, the synthetic leather base is subjected to roller coating twice by using the water-based surface treating agent, wherein the first roller coating amount is 12g/m2The second roll coating amount was 20g/m2And drying at 100 ℃.
Comparative example 1
Compared with example 3, the difference is only that:
equal amount of polyethylene glycol is used to replace polytetrahydrofuran ether glycol, dicyclohexyl methane diisocyanate, isophorone diamine and N-methyl diethanolamine.
Comparative example 2
Compared with example 3, the difference is only that:
the polytetrahydrofuran ether glycol was replaced by the same amount of polyethylene glycol.
Comparative example 3
Compared with example 3, the difference is only that:
the dicyclohexylmethane diisocyanate was replaced by an equal amount of hexamethylene diisocyanate.
Comparative example 4
Compared with example 3, the difference is only that:
the equivalent amount of ethylene glycol is used to replace isophorone diamine
Comparative example 5
Compared with example 3, the difference is only that:
the same amount of triethanolamine was used instead of N-methyldiethanolamine.
Experiment 1
Hydrolysis resistance test
The hydrolysis resistance of the polyurethane synthetic leather for the environment-friendly sofa furniture prepared in each example and comparative example is tested according to QB/T4671-.
Experiment 2
Physical Property test
The tensile load of the polyurethane synthetic leather for the environment-friendly sofa furniture prepared in each example and the comparative example is tested according to 5.7 in GB/T8949-2008 polyurethane Dry Artificial leather.
The tearing load of the polyurethane synthetic leather for the environment-friendly sofa furniture prepared in each example and the comparative example is tested according to 5.8 in GB/T8949-2008 polyurethane Dry Artificial leather.
The peel load of the polyurethane synthetic leather for the environment-friendly sofa furniture prepared in each example and the comparative example was tested according to 5.9 in GB/T8949-2008 polyurethane Dry Artificial leather.
The data for the tests 1 and 2 are detailed in Table 2.
TABLE 2
According to table 2, the data of examples 1 to 3 are compared with the data of comparative example 1, respectively, and the polytetrahydrofuran ether glycol, dicyclohexylmethane diisocyanate, isophorone diamine, and N-methyldiethanolamine are added in the preparation of the waterborne polyurethane, so that the tensile load, the tearing load, and the peeling load of the prepared polyurethane synthetic leather for the environment-friendly sofa furniture are obviously increased, the hydrolysis resistance is increased, and the combination of the polytetrahydrofuran ether glycol, the dicyclohexylmethane diisocyanate, the isophorone diamine, and the N-methyldiethanolamine is obviously helpful for improving the hydrolysis resistance of the polyurethane synthetic leather for the environment-friendly sofa furniture.
According to table 2, the tensile load, the tearing load and the peeling load of the prepared polyurethane synthetic leather for the environment-friendly sofa furniture are obviously increased, the hydrolysis resistance is increased, and the polyurethane synthetic leather for the environment-friendly sofa furniture has no obvious reinforcing effect due to the fact that the polytetrahydrofuran ether glycol, the dicyclohexylmethane diisocyanate, the isophorone diamine and the N-methyldiethanolamine lack of any substance.
According to table 2, the data of the embodiments 4 and 5 are compared with the data of the embodiment 3, respectively, and the adopted catalyst is one or more of stannous octoate, dibutyltin dilaurate, potassium acetate and bismuth isooctanoate, so that the tensile load, tearing load and peeling load of the prepared polyurethane synthetic leather for the environment-friendly sofa furniture are increased, the hydrolysis resistance is increased, and the selection of the specific catalyst is favorable for improving the hydrolysis resistance of the polyurethane synthetic leather for the environment-friendly sofa furniture to a certain extent.
According to the data in table 2, the data in examples 6 and 7 are compared with those in examples 8 and 9, respectively, and the selected cross-linking agent is prepared by mixing trimethylolpropane and diethylenetriamine according to a specific mass ratio, so that the tensile load, the tearing load and the peeling load of the prepared polyurethane synthetic leather for the environment-friendly sofa furniture are increased, the hydrolysis resistance is increased, the selection of the specific cross-linking agent is beneficial to improving the hydrolysis resistance of the polyurethane synthetic leather for the environment-friendly sofa furniture to a certain extent, and no obvious enhancement effect is achieved when any substance is replaced.
According to table 2, comparing the data of examples 10 and 11 with the data of example 3, respectively, the adopted foam stabilizer is one or two of polyacrylamide and sodium dodecyl benzene sulfonate, the tensile load, the tearing load and the peeling load of the prepared polyurethane synthetic leather for the environment-friendly sofa furniture are increased, the hydrolysis resistance is increased, and the selection of a specific catalyst is helpful for improving the hydrolysis resistance of the polyurethane synthetic leather for the environment-friendly sofa furniture to a certain extent, so that the polyurethane synthetic leather for the environment-friendly sofa furniture is obtained.
As shown in table 2, the data of examples 12 to 14 are compared with the data of example 3, and it can be seen that the tensile load, the tearing load and the peeling load of the prepared polyurethane synthetic leather for the environment-friendly sofa furniture are increased to some extent and the hydrolysis resistance of the polyurethane synthetic leather for the environment-friendly sofa furniture is increased to some extent by finishing the base cloth with acetic acid before padding treatment and then treating the base cloth with the two-dip and two-pad method, and by performing roll coating treatment on the water-based surface treatment agent for the synthetic leather bass before bonding.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (8)
1. A preparation method of polyurethane synthetic leather for green environment-friendly sofa furniture is characterized by comprising the following steps: the method comprises the following steps:
step 1) preparation of waterborne polyurethane:
step 1-1), adding 5-20 parts by mass of polytetrahydrofuran ether glycol and 5-15 parts by mass of dicyclohexylmethane diisocyanate into a container, heating to 80-100 ℃, and reacting for 3-4h to obtain a prepolymer;
step 1-2) cooling to 50-60 ℃, adding 0.5-5 parts by mass of isophorone diamine, 0.5-5 parts by mass of N-methyldiethanolamine, 0.1-0.3 part of catalyst and 5-15 parts of solvent, and preserving heat for 2-3 hours to obtain a mixed solution;
step 1-3), cooling to 20-50 ℃, adding 0.5-1 part by mass of a salt forming agent and 50-70 parts by mass of deionized water, and stirring for 30-50min to obtain waterborne polyurethane;
step 2) preparing surface layer slurry: adding 10-40 parts by mass of the waterborne polyurethane prepared in the step 1), adding 0.2-0.5 part by mass of a water-soluble acrylic thickener, 0.2-0.5 part by mass of an organic silicon defoamer, 0.5-1 part by mass of a leveling agent and 0.2-0.5 part by mass of a cross-linking agent, uniformly stirring, centrifugally defoaming, and standing to obtain a surface layer slurry;
step 3) preparing foaming layer slurry: adding 10-40 parts by mass of the waterborne polyurethane prepared in the step 1), 1-5 parts by mass of a foaming agent, 0.05-5 parts by mass of a thickening agent, 1-5 parts by mass of a foam stabilizer, 0.05-5 parts by mass of a fluorine modified polyacrylate copolymer and 0.05-5 parts by mass of amino resin, uniformly stirring, and mechanically foaming for 30-40min to obtain foaming layer slurry;
step 4), base cloth pretreatment: padding the base cloth with a softening agent, drying and ironing to obtain pretreated base cloth;
step 5), preparing the polyurethane synthetic leather for the environment-friendly sofa furniture:
step 5-1) preparing a surface layer: coating the surface layer sizing agent on release paper by scraping; baking at 60-70 deg.C for 5-8min, transferring into oven at 90-100 deg.C, and baking for 20-25min to obtain surface layer;
step 5-2) preparing synthetic leather bass: spreading the foaming layer slurry on the pretreated base cloth, baking at 60-70 deg.C for 15-20min, and oven-drying in oven at 90-100 deg.C for 30-40min to obtain synthetic leather Bass;
step 5-3), attaching: and (3) coating adhesive on the surface layer, baking in an oven at 90-100 ℃ for 2-5min, taking out, attaching the obtained product to the synthetic leather bass, and drying to obtain the environment-friendly polyurethane synthetic leather for sofa furniture.
2. The preparation method of the polyurethane synthetic leather for the environment-friendly sofa furniture, according to claim 1, is characterized in that: in the step 1-2), the catalyst is one or more of stannous octoate, potassium acetate and bismuth isooctanoate.
3. The preparation method of the polyurethane synthetic leather for the environment-friendly sofa furniture, according to any one of claims 1-2, is characterized in that: in the step 2), the cross-linking agent is trimethylolpropane and diethylenetriamine, and the weight ratio of the cross-linking agent to the trimethylolpropane to the diethylenetriamine is 1: (2-5) in a mass ratio.
4. The preparation method of the polyurethane synthetic leather for the environment-friendly sofa furniture, according to claim 1, is characterized in that: in the step 3), the foam stabilizer is one or two of polyacrylamide and sodium dodecyl benzene sulfonate.
5. The preparation method of the polyurethane synthetic leather for the environment-friendly sofa furniture, according to claim 1, is characterized in that: in the step 4), before padding treatment of the base fabric, the base fabric is firstly washed with water, the organic acid finishing agent is added into the water, and 60-80g of the organic acid finishing agent is added into each liter of water.
6. The preparation method of the polyurethane synthetic leather for the environment-friendly sofa furniture, according to claim 5, is characterized in that: in the step 4), the padding treatment of the base fabric adopts a two-dipping and two-rolling treatment mode, the rolling residual rate of the two-dipping and two-rolling is 60-70%, and the base fabric is dried at the temperature of 120-.
7. The environment-friendly sofa home according to claim 1The preparation method of the polyurethane synthetic leather for the tool is characterized by comprising the following steps: in the step 5-3), the water-based surface treating agent for the synthetic leather bass is subjected to roller coating twice before the laminating, wherein the first roller coating amount is 10-12g/m2The second roller coating amount is 18-20g/m2And drying at 80-100 ℃.
8. The utility model provides a polyurethane synthetic leather for green sofa furniture which characterized in that: the environment-friendly sofa furniture polyurethane synthetic leather is prepared by the method for preparing the environment-friendly sofa furniture polyurethane synthetic leather according to any one of claims 1-7.
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Application publication date: 20210723 |