CN113818256B - Process for preparing blending modified easy-to-decontaminate leather - Google Patents

Process for preparing blending modified easy-to-decontaminate leather Download PDF

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CN113818256B
CN113818256B CN202111126124.0A CN202111126124A CN113818256B CN 113818256 B CN113818256 B CN 113818256B CN 202111126124 A CN202111126124 A CN 202111126124A CN 113818256 B CN113818256 B CN 113818256B
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polyurethane
mass
parts
layer
solid
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CN113818256A (en
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王林云
刘明
刘小平
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Nantong Zhonghao Microfiber Products Co ltd
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Nantong Zhonghao Microfiber Products Co ltd
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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
    • D06N3/145—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 two or more layers of polyurethanes
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/0002—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate
    • D06N3/0006—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate using woven fabrics
    • 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
    • D06N3/0059—Organic ingredients with special effects, e.g. oil- or water-repellent, antimicrobial, flame-resistant, magnetic, bactericidal, odour-influencing agents; perfumes
    • 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
    • D06N3/0095—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 inversion technique; by transfer processes
    • D06N3/0097—Release surface, e.g. separation sheets; Silicone papers
    • 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
    • D06N2209/14—Properties of the materials having chemical properties
    • D06N2209/142—Hydrophobic
    • 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
    • D06N2209/14—Properties of the materials having chemical properties
    • D06N2209/146—Soilproof, soil repellent
    • 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
    • D06N2209/1671—Resistance to bacteria, mildew, mould, fungi
    • 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

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Synthetic Leather, Interior Materials Or Flexible Sheet Materials (AREA)

Abstract

The invention relates to a preparation process of blending modified easy-to-decontaminate leather, which comprises the following specific steps that a, modified polyurethane mixed slurry is coated on release paper to form a surface layer; b. coating the polyurethane mixed slurry on release paper to form a polyurethane transition layer; c. coating the environment-friendly high-solid-content polyurethane slurry on the dried polyurethane transition layer to form a high-solid-content polyurethane slurry layer; d. overlapping the superfine fiber fabric on the high-solid polyurethane slurry layer, and extruding and compounding by a press roll; e. baking through a baking oven; f. cooling to normal temperature through a cooling wheel, and separating leather from release paper to obtain the synthetic leather. The advantages are that the gravure printing mode is not needed, the internal addition mode is carried out by adopting the modified polyurethane resin, the compatibility is good, the separation is avoided, and the precipitation is good.

Description

Process for preparing blending modified easy-to-decontaminate leather
Technical Field
The invention relates to the field of leather production, in particular to a preparation process of blending modified easy-to-decontaminate leather.
Background
The leather products are widely used in daily life, and various chemical reagents used in the manufacturing process of leather products with the highest grade can cause great pollution to the environment, so that the leather products do not meet the environmental protection requirement; the dermis has irregular shape, more surface flaws, low utilization rate and high use cost for clients; superfine fiber leather is gradually replacing the traditional polyvinyl chloride and wet polyurethane leather, and is the product closest to the dermis at present; the common synthetic leather is produced by adopting thermoplastic polyurethane, so that the heat resistance and maintainability of the common synthetic leather are difficult to meet the use requirements of some public places. In order to achieve the decontamination effect of the leather surface, the prior art adopts gravure printing to realize decontamination, and the dual-component anti-doodling acrylic coating agent is transferred on the resin surface of the leather surface, so that the production efficiency is low, the cost is high, the hardness of the coating agent is high, the extensibility is low, the overall softness and texture of the product are affected, and the coating agent cannot be applied to the leather surface with high extensibility. At present, the finishing agent is coated on the leather surface by adopting an internal coating mode, but the finishing agent has poor compatibility with resin, and the problems of phase separation, precipitation and the like are easy to occur. The common polyurethane resin has no effects of preventing graffiti, preventing adhesion, preventing water and the like.
Disclosure of Invention
In order to solve the technical problems, the invention provides a preparation process of blending modified easy-to-decontaminate leather, which is novel in process, does not need a gravure printing mode, adopts a modified polyurethane resin internal addition mode, and has good compatibility and no separation and precipitation.
The technical scheme of the invention is as follows:
A process for preparing blending modified easy-to-decontaminate leather comprises the following specific steps,
A. coating the modified polyurethane mixed slurry on release paper, and drying at 80-100 ℃ for 2-3 minutes, wherein the coating weight is 100-120 g/square meter, so as to form a surface layer; the modified polyurethane mixed slurry comprises the following components: modified polyurethane resin: 100 parts by mass of a leveling agent: 0.3 to 0.5 part by mass, 1 to 3 parts by mass of aliphatic NCO prepolymer, 0.1 to 0.2 part by mass of defoamer and 0.8 to 1.5 parts by mass of mildew inhibitor.
B. Coating polyurethane mixed slurry on release paper, drying at 90-100 ℃ for 2-3 minutes, wherein the coating weight is 120-140 g/square meter, and forming a polyurethane transition layer; the polyurethane mixed slurry, wherein: polyurethane resin: 100 parts by mass of color paste: 4-12 parts by mass of a leveling agent: 0.3 to 0.5 part by mass, 1 to 3 parts by mass of aliphatic NCO prepolymer and 0.1 to 0.2 part by mass of defoamer.
C. and then coating the environment-friendly high-solid-content polyurethane slurry on the dried polyurethane transition layer, and baking for 1-1.5 minutes at 120-130 ℃ to form the high-solid-content polyurethane slurry layer, wherein the coating weight is 180-220 g/square meter.
D. And (C) overlapping the superfine fiber fabric with the thickness of 0.8-0.9mm on the high-solid-content polyurethane slurry layer in the step (C), and then extruding and compounding by a press roll, wherein the pressure of the press roll is 0.2-0.3MPa.
E. baking in an oven at 130-145 deg.C for 5-7 min.
F. The leather and the release paper are separated after being cooled to normal temperature by a cooling wheel, so that the superfine fiber synthetic leather which is resistant to high temperature and easy to treat and has antibacterial performance can be obtained.
The environment-friendly high-solid-content polyurethane slurry comprises the following components: high solid content polyurethane: 100 parts by mass of an amine curing agent, 0.7-1.4 parts by mass of methylene dichloride, 2-3 parts by mass of methyl acetate and 5-10 parts by mass of an amine curing agent.
The preparation method of the modified polyurethane resin comprises the following steps:
1) Firstly, 100 parts by mass of one or two polyurethane resins of polyester, polyether or polycarbonate with the solid content of 20-50% are heated to 70-90 ℃ to reduce the viscosity of the system.
2) 2-4 Parts by mass of di-functional isocyanate curing agent and tri-functional isocyanate curing agent with NCO content of 6-9% and 0.5-3 parts by mass of hydroxyl polyether modified siloxane with hydroxyl value content of 20-70mgKOH/g are respectively and slowly dripped into polyurethane resin.
3) And (5) after the dripping is completed, preserving heat and stirring for 30-60min to obtain the modified polyurethane resin.
The leather prepared by the preparation process of the blending modified easy-to-clean leather comprises a surface layer, a polyurethane transition layer, a high-solid-content polyurethane layer and a superfine fiber fabric layer, wherein the surface layer, the polyurethane transition layer, the high-solid-content polyurethane layer and the superfine fiber fabric layer are sequentially overlapped and compounded together from top to bottom to form a whole, and the surface layer is a modified polyurethane layer.
The invention has the advantages of ingenious process, no need of gravure printing mode, good compatibility, no separation and good precipitation by adopting a modified polyurethane resin for internal addition mode. The modified polyurethane resin is polyurethane coating resin with certain anti-fouling effect, and the surface of the modified resin has the effects of water resistance, oleophobic, anti-sticking and anti-doodling. The leather of the invention has good antibacterial effect.
Drawings
Fig. 1 is a schematic illustration of leather of the present invention.
Detailed Description
Referring to fig. 1, the leather prepared by the preparation process of the blending modified easy-to-clean leather comprises a surface layer 1, a polyurethane transition layer 2, a high-solid-content polyurethane layer 3 and a superfine fiber fabric layer 4, wherein the surface layer 1, the polyurethane transition layer 2, the high-solid-content polyurethane layer 3 and the superfine fiber fabric layer 4 are sequentially overlapped and compounded together from top to bottom to form a whole, and the surface layer is a modified polyurethane layer.
Example 1
A process for preparing blending modified easy-to-decontaminate leather comprises the following specific steps,
A. Coating modified polyurethane mixed slurry on release paper, drying at 80 ℃ for 2 minutes, wherein the coating weight is 100 g/square meter, and forming a surface layer; the modified polyurethane mixed slurry comprises the following components: modified polyurethane resin: 100 parts by mass of a leveling agent: 0.3 part by mass, 1.0 part by mass of aliphatic NCO prepolymer, 0.1 part by mass of defoamer and 0.8 part by mass of mildew inhibitor.
The preparation method of the modified polyurethane resin comprises the following steps:
1) Firstly, 100 parts by mass of one or two polyurethane resins of polyester, polyether or polycarbonate with the solid content of 20% are heated to 70 ℃ to reduce the viscosity of the system.
2) 3 Parts by mass of a di-or tri-functional isocyanate curing agent having an NCO content of 6% and 0.5 part by mass of a hydroxy polyether-modified silicone having a hydroxyl value content of 20mgKOH/g were slowly dropped into the polyurethane resin, respectively.
3) And (5) after the dripping is completed, preserving heat and stirring for 30min to obtain the modified polyurethane resin.
B. Coating polyurethane mixed slurry on release paper, drying at 90 ℃ for 2 minutes, wherein the coating weight is 120 g/square meter, and forming a polyurethane transition layer; the polyurethane mixed slurry, wherein: polyurethane resin: 100 parts by mass of color paste: 4 parts by mass of a leveling agent: 0.3 parts by mass of an aliphatic NCO prepolymer: 1.5 parts by mass of a defoaming agent and 0.1 part by mass of a defoaming agent.
C. Coating the environment-friendly high-solid-content polyurethane slurry on the dried polyurethane transition layer, and baking for 1 minute at 120 ℃ to form a high-solid-content polyurethane slurry layer, wherein the coating weight is 180 g/square meter; the environment-friendly high-solid-content polyurethane slurry comprises the following components: high solid content polyurethane: 100 parts by mass of an amine curing agent 1.4 parts by mass, 2 parts by mass of methylene dichloride and 5 parts by mass of methyl acetate.
D. and C, overlapping the superfine fiber fabric with the thickness of 0.8mm on the high-solid-content polyurethane slurry layer in the step C, and then extruding and compounding by a press roller, wherein the pressure of the press roller is 0.2MPa.
E. baking in an oven at 130 ℃ for 5 minutes.
F. The leather and the release paper are separated after being cooled to normal temperature by a cooling wheel, so that the superfine fiber synthetic leather which is resistant to high temperature and easy to treat and has antibacterial performance can be obtained.
Example 2
A process for preparing blending modified easy-to-decontaminate leather comprises the following specific steps,
A. Coating modified polyurethane mixed slurry on release paper, and drying at 90 ℃ for 3 minutes, wherein the coating weight is 120 g/square meter, so as to form a surface layer; the modified polyurethane mixed slurry comprises the following components: modified polyurethane resin: 100 parts by mass of a leveling agent: 0.5 part by mass, 2.0 parts by mass of aliphatic NCO prepolymer, 0.2 parts by mass of defoamer and 1.5 parts by mass of mildew inhibitor.
The preparation method of the modified polyurethane resin comprises the following steps:
1) Firstly, 100 parts by mass of one or two polyurethane resins of polyester, polyether or polycarbonate with the solid content of 50% are heated to 90 ℃, and the viscosity of the system is reduced.
2) 4 Parts by mass of a di-or tri-functional isocyanate curing agent having an NCO content of 9% and 3 parts by mass of a hydroxy polyether-modified silicone having a hydroxyl value content of 70mgKOH/g were slowly dropped into the polyurethane resin, respectively.
3) And (5) after the dripping is completed, preserving heat and stirring for 60min to obtain the modified polyurethane resin.
B. Coating polyurethane mixed slurry on release paper, and drying at 100 ℃ for 3 minutes, wherein the coating weight is 140 g/square meter, so as to form a polyurethane transition layer; the polyurethane mixed slurry, wherein: polyurethane resin: 100 parts by mass of color paste: 12 parts by mass of a leveling agent: 0.5 parts by mass of an aliphatic NCO prepolymer: 3 parts by mass and 0.2 part by mass of defoamer.
C. Then coating the environment-friendly high-solid polyurethane slurry on the dried polyurethane transition layer, and baking for 1.5 minutes at 130 ℃ with the coating weight of 220 g/square meter to form a high-solid polyurethane slurry layer; the environment-friendly high-solid-content polyurethane slurry comprises the following components: high solid content polyurethane: 100 parts by mass of a diamine curing agent 1.4 parts by mass, 3 parts by mass of methylene dichloride and 10 parts by mass of methyl acetate.
D. And C, overlapping the superfine fiber fabric with the thickness of 0.9mm on the high-solid-content polyurethane slurry layer in the step C, and then extruding and compounding by a press roller, wherein the pressure of the press roller is 0.3MPa.
E. Baking in an oven at 140 ℃ for 7 minutes.
F. The leather and the release paper are separated after being cooled to normal temperature by a cooling wheel, so that the superfine fiber synthetic leather which is resistant to high temperature and easy to treat and has antibacterial performance can be obtained.
Example 3
A process for preparing blending modified easy-to-decontaminate leather comprises the following specific steps,
A. Coating modified polyurethane mixed slurry on release paper, and drying at 85 ℃ for 2.5 minutes, wherein the coating weight is 110 g/square meter, so as to form a surface layer; the modified polyurethane mixed slurry comprises the following components: modified polyurethane resin: 100 parts by mass of a leveling agent: 0.4 part by mass, 2 parts by mass of aliphatic NCO prepolymer, 0.15 part by mass of defoamer and 1.15 parts by mass of mildew inhibitor.
The preparation method of the modified polyurethane resin comprises the following steps:
1) Firstly, 100 parts by mass of one or two polyurethane resins of polyester, polyether or polycarbonate with the solid content of 30% are heated to 80 ℃ to reduce the viscosity of the system.
2) 3 Parts by mass of a di-or tri-functional isocyanate curing agent having an NCO content of 8% and 2 parts by mass of a hydroxy polyether-modified silicone having a hydroxyl value content of 50mgKOH/g were slowly dropped into the polyurethane resin, respectively.
3) And (5) after the dripping is completed, preserving heat and stirring for 30-60min to obtain the modified polyurethane resin.
B. Coating polyurethane mixed slurry on release paper, drying at 95 ℃ for 2.5 minutes, wherein the coating weight is 130 g/square meter, and forming a polyurethane transition layer; the polyurethane mixed slurry, wherein: polyurethane resin: 100 parts by mass of color paste: 8 parts by mass of a leveling agent: 0.4 part by mass, 2 parts by mass of aliphatic NCO prepolymer and 0.15 part by mass of defoamer.
C. then coating the environment-friendly high-solid-content polyurethane slurry on the dried polyurethane transition layer, and baking for 1.3 minutes at 125 ℃ with the coating weight of 200 g/square meter to form a high-solid-content polyurethane slurry layer; the environment-friendly high-solid-content polyurethane slurry comprises the following components: high solid content polyurethane: 100 parts by mass of a diamine curing agent 1.0 part by mass, 2.5 parts by mass of methylene dichloride and 8 parts by mass of methyl acetate.
D. And (C) overlapping the superfine fiber fabric with the thickness of 0.85mm on the high-solid-content polyurethane slurry layer in the step (C), and then extruding and compounding by a press roller with the pressure of 0.25MPa.
E. Baking in a 140 ℃ oven for 6 minutes.
F. The leather and the release paper are separated after being cooled to normal temperature by a cooling wheel, so that the superfine fiber synthetic leather which is resistant to high temperature and easy to treat and has antibacterial performance can be obtained.
The technical effects of the invention are as follows:
1. The modified single-end dihydroxy polyether siloxane enables the leather surface to form a hydrophobic and oleophobic protective layer, so that stains are prevented from adhering; the single-end dihydroxy polyether siloxane is characterized in that the molecular weight is 1000-2500, silicone oil with small molecular weight can cause in a material interface layer and is easy to migrate and separate out, the use method is that the mixture is slowly dripped in a sealed container, and simultaneously the mixture is heated, stirred at high speed and stirred at high speed, so that-OH groups in the silicone oil and-NCO groups of an aliphatic NCO prepolymer are slowly reacted to generate, and the problem of poor compatibility between polyurethane and silicone oil after film formation is solved. The aliphatic NCO prepolymer and the polyurethane system can be compatible in any proportion, the compatibility of silicone oil in the system is common, and the silicone oil can be separated out and separated from the system when the addition amount is large.
2. The hydroxyl-terminated polyether siloxane molecular chain end-OH and-NCO react at high temperature to generate carbamate, so that the silicone oil is stably dispersed in the polyurethane coating, precipitation is prevented, and a long-term stain-resistant effect is maintained.
3. The NCO prepolymer in the step B can react with the residual unreacted-OH in the coating in the step a, and the interlayer adhesive force is enhanced through chemical reaction.
4. The bonding layer adopts thermosetting polyurethane, so that the problem of low softening point (160-180 ℃) of thermoplastic polyurethane is solved, and the softening point can reach more than 220 ℃.
5. The surface layer is added with a composite antibacterial agent, so that the product has broad-spectrum antibacterial effect.
And (3) comparing detection results:
。
through the comparison, the anti-fouling performance grade of the leather is far higher than at least 2 grades of the conventional common leather, and the leather can be applied to special occasions, is similar to kitchen and toilet spaces, and is suitable for public spaces.
The leather antibacterial effect detection method comprises the following steps:
1. Test strain: escherichia coli ATCC 8739, staphylococcus aureus ATCC 6538
ISO 22196-2011。
Sample treatment, namely sterilizing the sample by using 70% ethanol and cleaning the sample by using sterile water.
Eluent: SCDLP broth.
The contact time was 24 hours.
The test sample is 50mmx50mm, and the inoculation amount is 0.4mL.
。
2. Test strain:
Candida albicans ATCC10231.
Klebsiella pneumoniae ATCC 4352.
ISO 22 196-2011。
Sample treatment, namely sterilizing the sample by using 70% ethanol and cleaning the sample by using sterile water.
Eluent: SCDLP broth.
The contact time was 24 hours.
The sample to be tested is 50mmx 50mm, and the inoculation amount is 0.4mL.
。
Antibacterial effect evaluation reference value (refer to JIS Z2801-2012):
when the antibacterial activity value is more than or equal to 2.0, the product has antibacterial effect.
The leather of the present invention has an antibacterial effect against Escherichia coli ATCC 8739, staphylococcus aureus ATCC 6538, candida albicans ATCC10231, klebsiella pneumoniae ATCC 4352.

Claims (1)

1. A process for preparing blending modified easy-to-decontaminate leather is characterized by comprising the following specific steps of,
A. Coating modified polyurethane mixed slurry on release paper, and drying at 80-100 ℃ for 2-3 minutes, wherein the coating weight is 100-120 g/square meter, so as to form a surface layer; the modified polyurethane mixed slurry comprises the following components: modified polyurethane resin: 100 parts by mass of a leveling agent: 0.3 to 0.5 part by mass, 1 to 3 parts by mass of aliphatic NCO prepolymer, 0.1 to 0.2 part by mass of defoamer and 0.8 to 1.5 parts by mass of antibacterial agent;
b. Coating the polyurethane mixed slurry on the surface layer in the step a, and drying for 2-3 minutes at 90-100 ℃ with the coating weight of 120-140 g/square meter to form a polyurethane transition layer; the polyurethane mixed slurry, wherein: polyurethane resin: 100 parts by mass of color paste: 4-15 parts by mass of a leveling agent: 0.3 to 0.5 part by mass, 1 to 3 parts by mass of aliphatic NCO prepolymer and 0.1 to 0.2 part by mass of defoamer;
c. Then coating the environment-friendly high-solid-content polyurethane slurry on the dried polyurethane transition layer, and baking for 1-1.5 minutes at 120-130 ℃ to form a high-solid-content polyurethane slurry layer, wherein the coating weight is 180-220 g/square meter;
d. Overlapping the superfine fiber fabric with the thickness of 0.8-0.9mm on the high-solid-content polyurethane slurry layer in the step C, and then extruding and compounding by a press roller, wherein the pressure of the press roller is 0.2-0.3MPa;
e. baking for 5-7 minutes by a baking oven at 130-145 ℃;
f. Cooling to normal temperature by a cooling wheel, and separating leather from release paper to obtain the superfine fiber synthetic leather which is resistant to high temperature, easy to treat and has antibacterial property;
The environment-friendly high-solid-content polyurethane slurry comprises the following components: high solid content polyurethane: 100 parts by mass of an amine curing agent, 0.7-1.4 parts by mass of methylene dichloride, 2-3 parts by mass of methyl acetate and 5-10 parts by mass of an amine curing agent;
the preparation method of the modified polyurethane resin comprises the following steps:
1) Firstly, 100 parts by mass of one or two polyurethane resins of polyester, polyether or polycarbonate with the solid content of 20-50% are heated to 70-90 ℃, the viscosity of the system is reduced,
2) Slowly dripping 2-4 parts by mass of di-functional isocyanate curing agent and tri-functional isocyanate curing agent with NCO content of 6-9% and 0.5-3 parts by mass of hydroxyl polyether modified siloxane with hydroxyl value content of 20-70mgKOH/g into polyurethane resin respectively;
3) After the dripping is completed, preserving heat and stirring for 30-60min to obtain modified polyurethane resin;
The leather prepared by the preparation process of the blending modified easy-to-clean leather comprises a surface layer, a polyurethane transition layer, a high-solid-content polyurethane layer and a superfine fiber fabric layer, wherein the surface layer, the polyurethane transition layer, the high-solid-content polyurethane layer and the superfine fiber fabric layer are sequentially overlapped and compounded together from top to bottom to form a whole, and the surface layer is a modified polyurethane layer.
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