CN114481644B - Waterborne polyurethane synthetic leather and preparation method thereof - Google Patents
Waterborne polyurethane synthetic leather and preparation method thereof Download PDFInfo
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- CN114481644B CN114481644B CN202210083972.6A CN202210083972A CN114481644B CN 114481644 B CN114481644 B CN 114481644B CN 202210083972 A CN202210083972 A CN 202210083972A CN 114481644 B CN114481644 B CN 114481644B
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- 239000002649 leather substitute Substances 0.000 title claims abstract description 52
- 229920002635 polyurethane Polymers 0.000 title claims abstract description 35
- 239000004814 polyurethane Substances 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 239000010410 layer Substances 0.000 claims abstract description 90
- 239000002344 surface layer Substances 0.000 claims abstract description 62
- 239000004744 fabric Substances 0.000 claims abstract description 60
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 34
- 238000002791 soaking Methods 0.000 claims abstract description 27
- 239000002002 slurry Substances 0.000 claims abstract description 23
- 238000003490 calendering Methods 0.000 claims abstract description 22
- 239000000835 fiber Substances 0.000 claims abstract description 14
- 238000001035 drying Methods 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 13
- 239000002245 particle Substances 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 239000011248 coating agent Substances 0.000 claims abstract description 7
- 238000000576 coating method Methods 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 238000005303 weighing Methods 0.000 claims abstract description 7
- 238000002156 mixing Methods 0.000 claims abstract description 5
- 239000002562 thickening agent Substances 0.000 claims description 24
- 239000003795 chemical substances by application Substances 0.000 claims description 17
- 239000013530 defoamer Substances 0.000 claims description 14
- SWXVUIWOUIDPGS-UHFFFAOYSA-N diacetone alcohol Chemical compound CC(=O)CC(C)(C)O SWXVUIWOUIDPGS-UHFFFAOYSA-N 0.000 claims description 14
- 229920005749 polyurethane resin Polymers 0.000 claims description 13
- 239000003063 flame retardant Substances 0.000 claims description 11
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 8
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 7
- 239000002518 antifoaming agent Substances 0.000 claims description 7
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 7
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 7
- -1 polydimethylsiloxane Polymers 0.000 claims description 7
- 229920000570 polyether Polymers 0.000 claims description 7
- CHUGKEQJSLOLHL-UHFFFAOYSA-N 2,2-Bis(bromomethyl)propane-1,3-diol Chemical group OCC(CO)(CBr)CBr CHUGKEQJSLOLHL-UHFFFAOYSA-N 0.000 claims description 5
- 229920003063 hydroxymethyl cellulose Polymers 0.000 claims description 5
- 229940031574 hydroxymethyl cellulose Drugs 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- 230000000052 comparative effect Effects 0.000 description 11
- 239000010985 leather Substances 0.000 description 10
- 238000005299 abrasion Methods 0.000 description 6
- 238000007654 immersion Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 210000004207 dermis Anatomy 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 230000007480 spreading Effects 0.000 description 3
- 238000003892 spreading Methods 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 230000002708 enhancing effect Effects 0.000 description 2
- 239000002932 luster Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229920001410 Microfiber Polymers 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000003658 microfiber Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- 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
- D06N3/18—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with two layers of different macromolecular materials
- D06N3/183—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with two layers of different macromolecular materials the layers are one next to the other
-
- 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
-
- 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
- D06N3/04—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 by reactions only involving carbon-to-carbon unsaturated bonds
- D06N3/06—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 by reactions only involving carbon-to-carbon unsaturated bonds with polyvinylchloride or its copolymerisation products
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/12—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins
- D06N3/14—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins with polyurethanes
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N2209/00—Properties of the materials
- D06N2209/06—Properties of the materials having thermal properties
- D06N2209/067—Flame resistant, fire resistant
-
- 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
- D06N2209/08—Properties of the materials having optical properties
- D06N2209/0838—Bright, glossy, shiny surface
-
- 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
- D06N2209/103—Resistant to mechanical forces, e.g. shock, impact, puncture, flexion, shear, compression, tear
-
- 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
- D06N2209/16—Properties of the materials having other properties
- D06N2209/1642—Hardnes
-
- 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
- D06N2209/16—Properties of the materials having other properties
- D06N2209/1685—Wear resistance
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
- Y02P70/62—Manufacturing or production processes characterised by the final manufactured product related technologies for production or treatment of textile or flexible materials or products thereof, including footwear
Abstract
The application relates to the field of synthetic leather, and particularly discloses waterborne polyurethane synthetic leather and a preparation method thereof. Because the PVC layer is arranged on the base cloth layer, the surface flatness of the PVC layer is high, and therefore, after the water-based surface layer is coated on the PVC layer, the surface flatness of the water-based surface layer can be improved. The application also discloses a preparation method of the waterborne polyurethane synthetic leather, which comprises the following steps: preparing materials: weighing and mixing the raw materials to obtain aqueous soaking solution and aqueous surface layer slurry; preparing a base cloth layer: soaking the superfine fiber base cloth in the aqueous soaking solution for 3-5min, taking out and drying to obtain a base cloth layer; PVC calendaring: heating PVC particles, and then calendaring on the base cloth layer to form a PVC layer; preparing a water-based surface layer: and coating aqueous surface layer slurry on the PVC layer to obtain the aqueous polyurethane synthetic leather.
Description
Technical Field
The application relates to the field of synthetic leather, in particular to waterborne polyurethane synthetic leather and a preparation method thereof.
Background
Synthetic leather is a plastic product which mimics the composition and structure of natural leather and can be used as its material to be used, and is generally produced by using impregnated non-woven fabric as a net layer and a microporous polyurethane layer as a grain layer. The front and back sides of the leather are very similar to leather, and the leather has certain air permeability and is more similar to natural leather than common artificial leather. Is widely used for manufacturing shoes, boots, bags, balls and the like.
The waterborne polyurethane synthetic leather has soft and natural luster and soft hand feeling, and the waterborne polyurethane synthetic leather as the best substitute product of solvent type synthetic leather has become an industry development direction. However, the simple adoption of the aqueous polyurethane material for processing the synthetic leather has certain limitation, the surface smoothness is poor, the wear resistance is not high, and the synthetic leather needs to be further improved.
Disclosure of Invention
The application provides waterborne polyurethane synthetic leather and a preparation method thereof in order to improve the flatness of the waterborne polyurethane synthetic leather. In a first aspect, the application provides an aqueous polyurethane synthetic leather, which adopts the following technical scheme:
an aqueous polyurethane synthetic leather comprises a base cloth layer, a PVC layer and an aqueous surface layer, wherein the PVC layer is positioned between the base cloth layer and the aqueous surface layer.
By adopting the technical scheme, the base cloth layer keeps the tensile resistance of the synthetic leather, so that the synthetic leather is not easy to tear, the PVC layer endows the synthetic leather with higher wear resistance and better surface flatness, the water-based surface layer has the characteristics of soft and natural luster and soft hand feel, has wear resistance and ageing resistance, and has the appearance similar to leather, so that the synthetic leather disclosed by the application has good surface flatness and strong wear resistance, and is suitable for further popularization and use.
In a specific embodiment, the aqueous surface layer comprises the following raw materials in parts by weight:
100 parts of aqueous polyurethane resin;
1-2 parts of flatting agent;
0.1-0.2 part of defoaming agent;
1-3 parts of a thickening agent;
5-12 parts of color paste.
By adopting the technical scheme, the water-based surface layer is coated on the PVC layer, the main material of the water-based surface layer is water-based polyurethane resin, the water-based polyurethane resin has leather texture, and meanwhile, the leveling agent can enable the water-based surface layer to be easier to coat, so that the surface of the water-based surface layer is smoother; the thickening agent can enhance the viscosity degree of the aqueous polyurethane, so that the aqueous polyurethane can be better adhered to the PVC layer; the defoamer can eliminate bubbles generated in the aqueous polyurethane, so that the inside of the aqueous surface layer is firmer and the surface is smoother; the color paste can change the color of the water-based surface layer, thereby improving the aesthetic property of the synthetic leather.
In a specific embodiment, the base fabric layer comprises a microfiber base fabric and an aqueous soaking solution.
Through adopting above-mentioned technical scheme, superfine fiber base cloth is as the main part material of base cloth layer, and superfine fiber base cloth is difficult for being torn, and has better compliance, and after superfine fiber base cloth soaked in aqueous immersion liquid the inside, aqueous immersion liquid fills in the gap in the superfine fiber base cloth for the base cloth layer is more closely knit, and the base cloth layer is as the inlayer of synthetic leather simultaneously, also can give synthetic leather better feel and wearability.
In a specific embodiment, the leveling agent is one or two of diacetone alcohol and hydroxymethyl cellulose.
In a specific embodiment, the defoamer is selected from polyether modified polydimethylsiloxane and defoamer RK-630D.
In a specific embodiment, the thickener is one or both of the thickeners PU-40 and 660.
In a specific embodiment, the aqueous soaking solution comprises the following raw materials in parts by weight:
100 parts of aqueous polyurethane resin;
300-400 parts of water;
20-30 parts of flame retardant;
0.5-3 parts of color paste.
Through adopting above-mentioned technical scheme, waterborne polyurethane resin improves the genuine leather feel of base cloth layer, and the mill base is used for adjusting the colour of base cloth layer, and the fire resistance of synthetic leather is improved to the fire retardant, has promoted the combustion condition of base cloth layer, has promoted the safety in utilization of synthetic leather.
In a specific embodiment, the flame retardant is selected from dibromoneopentyl glycol.
In a second aspect, the application provides a preparation method of waterborne polyurethane synthetic leather, which comprises the following steps:
preparing materials: weighing and mixing the raw materials to obtain aqueous soaking solution and aqueous surface layer slurry;
preparing a base cloth layer: soaking the superfine fiber base cloth in the aqueous soaking solution for 3-5min, taking out and drying to obtain a base cloth layer;
PVC calendaring: heating PVC particles, and then calendaring on the base cloth layer to form a PVC layer;
preparing a water-based surface layer: and coating aqueous surface layer slurry on the PVC layer, drying the aqueous surface layer slurry, and forming the aqueous surface layer to obtain the aqueous polyurethane synthetic leather.
Through adopting above-mentioned technical scheme, superfine fiber base cloth combines through soaking and waterborne soak, possesses stronger wearability and feel better after the stoving, melts the PVC particle back adhesion on the base cloth layer through the calendering, and the PVC layer roughness that the calendering formed is high, the wearability is good, after the waterborne surface course is coated on the PVC layer, and synthetic leather possesses the feel that is close to the dermis, and above-mentioned method easy operation, preparation condition easily realizes, is fit for extensive popularization.
In summary, the application has the following beneficial effects:
1. because the PVC layer is arranged on the base cloth layer, the surface smoothness of the PVC layer is high, and therefore, after the water-based surface layer is coated on the PVC layer, the surface smoothness of the water-based surface layer can be improved, and the synthetic leather has better use experience.
2. In the application, the water-based polyurethane is preferably used as the resin material of the water-based surface layer, and the water-based polyurethane has the advantages of incombustibility, small smell, no pollution to the environment, energy conservation, convenient operation and processing and the like.
3. According to the method disclosed by the application, the PVC layer is connected with the base cloth layer through calendaring, so that the bonding strength of the PVC layer and the base cloth layer is improved, the stability of the synthetic leather is improved, the synthetic leather is not easy to crack among the layers, and meanwhile, the surface flatness of the PVC layer is improved through calendaring.
Detailed Description
Table 1: the source and model of each raw material component
Examples
Example 1
Preparing materials: weighing 100kg of aqueous polyurethane resin and 1kg of flatting agent; 0.1kg of defoamer; 1kg of a thickener; 5kg of color paste is stirred for 20min to prepare aqueous surface layer slurry, diacetone alcohol is adopted as a leveling agent, polyether modified polydimethylsiloxane is adopted as a defoaming agent, and PU-40 is adopted as a thickening agent; 100kg of aqueous polyurethane resin, 300 kg of water, kg of water, 20 kg of flame retardant, 0.5kg of dibromoneopentyl glycol as the flame retardant, and stirring for 30min to obtain an aqueous soaking solution.
Preparing a base cloth layer: soaking the superfine fiber base cloth in the aqueous soaking solution for 3min, taking out and drying to obtain a base cloth layer;
PVC calendaring: heating PVC particles to 170 ℃ for melting and softening, spreading the PVC particles on a base cloth layer for calendering, and naturally cooling to room temperature after calendering to form a PVC layer;
preparing a water-based surface layer: and coating aqueous surface layer slurry on the PVC layer, drying the aqueous surface layer slurry, and forming the aqueous surface layer to obtain the aqueous polyurethane synthetic leather.
Example 2
Preparing materials: weighing 100kg of aqueous polyurethane resin and 2kg of flatting agent; 0.3kg of defoamer; 3kg of a thickening agent; 12kg of color paste is stirred for 30min to prepare aqueous surface layer slurry, diacetone alcohol is adopted as a leveling agent, polyether modified polydimethylsiloxane is adopted as a defoaming agent, and PU-40 is adopted as a thickening agent; 100kg of aqueous polyurethane resin, 400 kg of water, kg kg of flame retardant, 3kg of dibromoneopentyl glycol as the flame retardant and stirring for 30min to obtain aqueous soaking liquid.
Preparing a base cloth layer: soaking the superfine fiber base cloth in the aqueous soaking solution for 5min, taking out and drying to obtain a base cloth layer;
PVC calendaring: heating PVC particles to 170 ℃ for melting and softening, spreading the PVC particles on a base cloth layer for calendering, and naturally cooling to room temperature after calendering to form a PVC layer;
preparing a water-based surface layer: and coating aqueous surface layer slurry on the PVC layer, drying the aqueous surface layer slurry, and forming the aqueous surface layer to obtain the aqueous polyurethane synthetic leather.
Example 3
Preparing materials: weighing 100kg of aqueous polyurethane resin and 1.5kg of flatting agent; 0.15kg of defoamer; 2kg of a thickener; 8kg of color paste is stirred for 30min to prepare aqueous surface layer slurry, diacetone alcohol is adopted as a leveling agent, polyether modified polydimethylsiloxane is adopted as a defoaming agent, and PU-40 is adopted as a thickening agent; 100kg of aqueous polyurethane resin, 350kg of water, 25kg of flame retardant, 2kg of dibromoneopentyl glycol as the flame retardant and stirring for 30min to obtain aqueous soaking solution.
Preparing a base cloth layer: soaking the superfine fiber base cloth in the aqueous soaking solution for 4min, taking out and drying to obtain a base cloth layer;
PVC calendaring: heating PVC particles to 170 ℃ for melting and softening, spreading the PVC particles on a base cloth layer for calendering, and naturally cooling to room temperature after calendering to form a PVC layer;
preparing a water-based surface layer: and coating aqueous surface layer slurry on the PVC layer, drying the aqueous surface layer slurry, and forming the aqueous surface layer to obtain the aqueous polyurethane synthetic leather.
Example 4
Example 4 differs from example 3 only in that 0.75kg diacetone alcohol and 0.75kg hydroxymethyl cellulose are used as the leveling agent in example 4.
Example 5
Example 5 differs from example 3 only in that 1.5kg of hydroxymethyl cellulose is used as the leveling agent in example 5.
Example 6
Example 6 differs from example 3 only in that the defoamer of example 6 used 0.075kg of polyether modified polydimethylsiloxane and 0.075kg of defoamer RK-630D.
Example 7
Example 7 differs from example 3 only in that 0.15kg of defoamer RK-630D was used as defoamer in example 7.
Example 8
Example 8 differs from example 3 only in that 1kg of thickener PU-40 and 1kg of thickener 660 are used as the thickener in example 8.
Example 9
Example 9 differs from example 3 only in that 2kg of thickener 660 was used as the thickener in example 9.
Example 10
Example 10 differs from example 3 only in that the base fabric layer in example 10 was not soaked with the aqueous soak solution.
Example 11
Example 11 differs from example 3 only in that the amount of leveling agent added in example 11 is 0.
Example 12
Example 12 differs from example 3 only in that the amount of the antifoaming agent added in example 12 is 0.
Example 13
Example 13 differs from example 3 only in that the thickener in example 13 was added in an amount of 0.
Example 14
Example 14 differs from example 3 only in that the color paste in example 14 was added in an amount of 1.5kg.
Example 15
Example 15 differs from example 3 only in that the color paste in example 15 was added in an amount of 2.5kg.
Example 16
Example 16 differs from example 3 only in that the amount of water added in example 16 was 200kg.
Example 17
Example 17 differs from example 3 only in that the amount of water added in example 17 was 500kg.
Comparative example
Comparative example 1
Comparative example 1 differs from example 3 only in that comparative example 1 does not contain a PVC layer.
Comparative example 2
Comparative example 2 differs from example 3 only in that comparative example 2 does not contain an aqueous facing layer.
Performance test
Detection method/test method
1. The abrasion resistance of the aqueous top layers of each example and each comparative example was tested according to QB/T2726-2005 determination of abrasion resistance for leather physical and mechanical tests. The test grade fractions were divided into five grades: A. abrasion is obvious; B. the abrasion is obvious; C. the abrasion energy is respectively; D. wear is difficult to see; E. wear cannot be seen.
Determination of tensile Strength and elongation of leather "QB/T3812.5-99" the synthetic leather of each example and each comparative example was subjected to the determination of tensile Strength and elongation.
Results and results analysis
Table 2: experimental data for each example and each comparative example
Analysis of results
In combination with the embodiment 1-3, the comparative examples 1-2 and the table 2, the base cloth layer, the PVC layer and the aqueous surface layer are combined with each other, the base cloth layer provides better softness, the superfine fiber base cloth has better hand feeling and texture which is closer to dermis after being soaked in the aqueous soaking solution, the PVC layer formed by calendaring has stronger surface flatness, the aqueous surface layer is coated on the PVC layer, the aqueous surface layer also has better surface flatness, the aqueous surface layer adopts aqueous polyurethane as a base material, and a leveling agent, a thickening agent and a defoaming agent are added, so that the aqueous surface layer has texture which is closer to dermis. Meanwhile, PVC has better wear resistance and mechanical strength, and can improve the mechanical properties of the synthetic leather.
In combination with examples 3-5, 11 and table 2, the addition of the leveling agent can enhance the tensile strength and elongation at break of the synthetic leather, also makes the aqueous top layer easier to coat, and the effect of diacetone alcohol in the leveling agent is slightly better than that of hydroxymethyl cellulose.
In combination with examples 3, 12, 6-7 and 2, the defoamer can reduce the surface tension of the aqueous surface layer slurry and reduce the formation of foam in the aqueous surface layer slurry, so that the aqueous surface layer can be smoother and more compact, and the defoaming effect of the defoamer RK-630D is slightly better than that of polyether modified polydimethylsiloxane.
In combination with examples 3, 13, 8-8 and 2, the addition of the thickener can enhance the viscosity of the aqueous surface layer, thereby enhancing the abrasion resistance of the aqueous surface layer, further enhancing the connection strength of the aqueous surface layer slurry and the PVC layer, and the effect of the thickener PU-40 in the present application is superior to that of the thickener 660.
In combination with examples 3 and 10 and table 2, the strength of the connection between the base fabric layer and the PVC layer was reduced and the feel of the base fabric layer was deteriorated without immersing the base fabric layer in the aqueous immersion liquid.
In combination with examples 3 and 13-14 and Table 2, the more the color paste is added, the poorer the mechanical properties of the synthetic leather, the color paste plays a role in color mixing, and the mechanical properties of the synthetic leather are adversely affected when the color paste is excessive, so that the color paste has smaller influence in the proportion range of the color paste in examples 1-3.
In combination of examples 3 and 16-17 and Table 2, when the water addition was too much, the aqueous immersion liquid was too diluted, and when the water addition was too little, the viscosity of the aqueous immersion liquid was too high, so that the water ratios in examples 1-3 of the present application were able to achieve superior effects.
The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.
Claims (7)
1. The waterborne polyurethane synthetic leather is characterized by comprising a base cloth layer, a PVC layer and a waterborne surface layer, wherein the PVC layer is positioned between the base cloth layer and the waterborne surface layer;
the base cloth layer comprises superfine fiber base cloth and aqueous soaking liquid;
the aqueous soaking liquid comprises the following raw materials in parts by weight:
100 parts of aqueous polyurethane resin;
300-400 parts of water;
20-30 parts of flame retardant;
0.5-3 parts of color paste;
the preparation of the aqueous polyurethane synthetic leather is as follows:
preparing materials: weighing and mixing the raw materials to obtain aqueous soaking solution and aqueous surface layer slurry;
preparing a base cloth layer: soaking the superfine fiber base cloth in the aqueous soaking solution for 3-5min, taking out and drying to obtain a base cloth layer;
PVC calendaring: heating PVC particles, and then calendaring on the base cloth layer to form a PVC layer;
preparing a water-based surface layer: and coating aqueous surface layer slurry on the PVC layer, drying the aqueous surface layer slurry, and forming the aqueous surface layer to obtain the aqueous polyurethane synthetic leather.
2. The aqueous polyurethane synthetic leather according to claim 1, wherein: the water-based surface layer comprises the following raw materials in parts by weight:
100 parts of aqueous polyurethane resin;
1-2 parts of flatting agent;
0.1-0.2 part of defoaming agent;
1-3 parts of a thickening agent;
5-12 parts of color paste.
3. The aqueous polyurethane synthetic leather according to claim 2, wherein: the leveling agent is one or two of diacetone alcohol and hydroxymethyl cellulose.
4. The aqueous polyurethane synthetic leather according to claim 2, wherein: the defoamer is polyether modified polydimethylsiloxane and defoamer RK-630D.
5. The aqueous polyurethane synthetic leather according to claim 2, wherein: the thickener is one or two of a thickener PU-40 and a thickener 660.
6. The aqueous polyurethane synthetic leather according to claim 1, wherein: the flame retardant is dibromoneopentyl glycol.
7. The method for preparing the aqueous polyurethane synthetic leather according to any one of claims 1 to 6, which is characterized in that: the method comprises the following steps:
preparing materials: weighing and mixing the raw materials to obtain aqueous soaking solution and aqueous surface layer slurry;
preparing a base cloth layer: soaking the superfine fiber base cloth in the aqueous soaking solution for 3-5min, taking out and drying to obtain a base cloth layer;
PVC calendaring: heating PVC particles, and then calendaring on the base cloth layer to form a PVC layer;
preparing a water-based surface layer: and coating aqueous surface layer slurry on the PVC layer, drying the aqueous surface layer slurry, and forming the aqueous surface layer to obtain the aqueous polyurethane synthetic leather.
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