CN113622201B - Polyurethane synthetic leather with high moisture absorption and air permeability and preparation method thereof - Google Patents

Polyurethane synthetic leather with high moisture absorption and air permeability and preparation method thereof Download PDF

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CN113622201B
CN113622201B CN202110968699.0A CN202110968699A CN113622201B CN 113622201 B CN113622201 B CN 113622201B CN 202110968699 A CN202110968699 A CN 202110968699A CN 113622201 B CN113622201 B CN 113622201B
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polyurethane
diatomite
synthetic leather
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CN113622201A (en
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胡玉婷
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Dongyang Decai Textile Co ltd
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Dongyang Decai Textile 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
    • 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
    • D06N3/0011—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 non-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
    • D06N3/0056—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the compounding ingredients of the macro-molecular coating
    • D06N3/0063—Inorganic compounding ingredients, e.g. metals, carbon fibres, Na2CO3, metal layers; Post-treatment with inorganic compounds
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N2209/00—Properties of the materials
    • D06N2209/12—Permeability or impermeability properties
    • D06N2209/121—Permeability to gases, adsorption
    • D06N2209/123—Breathable
    • 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
    • D06N2209/148—Superabsorbing
    • 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
    • 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)
  • Inorganic Chemistry (AREA)
  • Synthetic Leather, Interior Materials Or Flexible Sheet Materials (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)

Abstract

The invention relates to the technical field of synthetic leather, and discloses polyurethane synthetic leather with high moisture absorption and air permeability and a preparation method thereof. The polyurethane synthetic leather comprises non-woven fabric base cloth and a polyurethane coating, wherein the polyurethane coating comprises the following raw materials in parts by weight: 80-100 parts of water-based polyurethane emulsion, 2-6 parts of surfactant, 5-10 parts of moisture-absorbing breathable particles, 0.1-2 parts of water-soluble cellulose thickener, 0.1-2 parts of isocyanate cross-linking agent and 0-8 parts of water-based colorant; the moisture-absorbing and breathable particles comprise diatomite and a porous hydrophilic polymer coating layer coated outside the diatomite. In the moisture-absorbing and breathable particles adopted by the invention, the porous hydrophilic polymer coating layer is coated on the surface of the diatomite, so that the phenomenon that the surface of the synthetic leather is burred due to the addition of the diatomite can be prevented, and the moisture absorption and the breathability of the diatomite are not greatly influenced.

Description

Polyurethane synthetic leather with high moisture absorption and air permeability and preparation method thereof
Technical Field
The invention relates to the technical field of synthetic leather, in particular to polyurethane synthetic leather with high moisture absorption and air permeability and a preparation method thereof.
Background
The synthetic leather is also called as imitation leather or sizing material, is made by processing various foaming or film-covering polyvinyl chloride (PVC) or Polyurethane (PU) with different formulas on a textile fabric base or a non-woven fabric base, can be processed and manufactured according to the requirements of different strength, abrasion resistance, cold resistance, color, luster, pattern and the like, and has the characteristics of various designs and colors, good waterproof performance, neat edge and breadth, high utilization rate and relatively low price compared with real leather.
Synthetic leather with textile fabric as a substrate and polyurethane as a coating has been developed for over 80 years, and is widely applied to various aspects of people's life at present. The traditional polyurethane synthetic leather produced by taking solvent polyurethane as a main raw material has the problems of volatilization of organic solvents and pollution. The Waterborne Polyurethane (WPU) takes water as a medium, has the advantages of no toxicity, no odor, no pollution, difficult combustion and the like, is a good substitute material of the traditional solvent type polyurethane, and is widely applied to the fields of textile fabric coatings, synthetic leather, natural leather finishing, adhesives and the like. A functional coating product which is formed by coating PU (polyurethane) as matrix resin on textile fabrics is called ecological functional synthetic leather, is fourth-generation artificial leather, and is the development direction of the future synthetic leather.
At present, the difference between polyurethane synthetic leather and natural leather in the aspects of moisture absorption and air permeability is obvious, which is a problem to be solved urgently in the field of synthetic leather. Chinese patent document No. CN201810850749.3 discloses a method for preparing moisture-absorbing, antibacterial and water vapor permeable graphene modified polyurethane synthetic leather, wherein the moisture absorption and air permeability of the synthetic leather can be improved by adding graphene with a porous structure, but simultaneously, the addition of graphene can cause burr feeling on the surface of the synthetic leather, and seriously affect the hand feeling.
Disclosure of Invention
In order to solve the technical problems, the invention provides polyurethane synthetic leather with high moisture absorption and air permeability and a preparation method thereof. According to the invention, the special moisture-absorbing and breathable particles are added into the polyurethane synthetic leather, so that the synthetic leather has higher dilution and breathability, and simultaneously, the surface of the synthetic leather is prevented from generating burr feeling, and the synthetic leather has better hand feeling.
The specific technical scheme of the invention is as follows:
the polyurethane synthetic leather with high moisture absorption and air permeability comprises a non-woven fabric base cloth and a polyurethane coating, wherein the polyurethane coating comprises the following raw materials in parts by weight: 80-100 parts of water-based polyurethane emulsion, 2-6 parts of surfactant, 5-10 parts of moisture-absorbing and breathable particles, 0.1-2 parts of water-soluble cellulose thickening agent, 0.1-2 parts of isocyanate crosslinking agent and 0-8 parts of water-based colorant; the moisture-absorbing and breathable particles comprise diatomite and a porous hydrophilic polymer coating layer coated outside the diatomite.
The diatomite has good water absorbability, and the absorbed water can be naturally evaporated, so that the water absorbability of the synthetic leather can be improved, and meanwhile, the synthetic leather has good air permeability due to the high porosity of the diatomite. However, since the diatomite has high hardness and a rough surface, the synthetic leather has improved moisture absorption and air permeability and also has an influence on hand feeling, so that the surface of the synthetic leather has a burr feeling. Aiming at the problem, the diatomite is coated by the hydrophilic polymer, and the hydrophilic polymer layer has higher flexibility compared with the diatomite, so that the hand feeling of the surface of the moisture-absorbing and breathable particles can be improved, and the burr feeling on the surface of the synthetic leather caused by adding the hydrophilic polymer layer is prevented; in addition, the coating layer adopts hydrophilic polymers and has high porosity, so that the moisture absorption and air permeability of the diatomite are not greatly influenced.
Preferably, in the moisture-absorbing and breathable particles, the diatomite has a particle size of 300-400 meshes, and the porous hydrophilic polymer coating layer has a thickness of 10-20 μm.
Preferably, the method for preparing the moisture-absorbing breathable particles comprises the following steps:
(A) And (3) diatomite surface treatment: mixing 3-aminopropyltrimethoxysilane and water according to the mass ratio of 1; adding diatomite into the coupling agent solution, fully dispersing, and stirring and reacting for 1-2h at the temperature of 30-50 ℃; after the reaction is finished, filtering, and then soaking in the birch tar for 1-3h to obtain modified diatomite;
(B) Coating with a hydrophilic polymer: dissolving water-soluble acrylic resin and water-soluble epoxy resin in water to prepare a coating agent solution; adding the modified diatomite into the coating agent solution, stirring for 2-3h after fully dispersing, and filtering to obtain hydrophilic polymer coated diatomite;
(C) Hole making and curing: placing the hydrophilic polymer coated diatomite at 60-70 deg.C under 0.01-0.03MPa for 30-40min, heating to 160-170 deg.C, and curing for 2-3h to obtain the moisture-absorbing and air-permeable particles.
In the step (A), 3-aminopropyl trimethoxy silane is hydrolyzed to form silicon hydroxyl, and then reacts with the silicon hydroxyl on the surface of the diatomite so as to be grafted on the diatomite; in the step (B), epoxy groups in the epoxy resin react with amino groups (from 3-aminopropyltrimethoxysilane) on the surface of the modified diatomite to be covalently grafted to the surface of the modified diatomite, and the acrylic resin is bonded to the surface of the modified diatomite by crosslinking with the epoxy resin; in the step (C), in the curing process, the epoxy group in the epoxy resin and the carboxyl group in the acrylic resin carry out ring-opening reaction to form chemical crosslinking. Through the mode, the epoxy resin and the acrylic resin can form the coating layer on the surface of the diatomite, and the adopted epoxy resin and the adopted acrylic resin are both water-soluble resins and have high hydrophilicity, so that the influence of polymer coating on the hygroscopicity of the diatomite can be reduced. In addition, the coating layer is covalently bonded on the surface of the diatomite through the epoxy resin in the coating layer, and the epoxy resin and the acrylic resin in the coating layer are covalently crosslinked, so that the coating layer is not easy to wear or peel off from the surface of the diatomite in the use process of the synthetic leather, and better hand feeling can be maintained.
Soaking birch tar oil to make the birch tar oil be adsorbed in diatomite; in the step (C), the polymer coating layer has low crosslinking strength before curing, and low-pressure high-temperature treatment is carried out at the moment to quickly volatilize the birch tar in the diatomite and form larger gaps in the hydrophilic polymer coating layer, so that the polymer coating is prevented from greatly influencing the moisture absorption and air permeability of the diatomite. Furthermore, birch tar has a leather-like scorched wood smell, which remains in the diatomaceous earth, which can impart a polyurethane synthetic leather-like smell similar to that of natural leather.
Preferably, in the step (a), the mass ratio of the diatomite to the coupling agent solution is 1.
Preferably, in the step (B), the mass ratio of the water-soluble acrylic resin, the water-soluble epoxy resin and the water in the coating agent solution is 4 to 5.
Preferably, in the step (B), the mass ratio of the modified diatomite to the coating agent solution is 1.
Preferably, the surfactant is sodium lauryl sulfate.
Preferably, the solid content of the aqueous polyurethane emulsion is 20-40wt%.
A preparation method of the polyurethane synthetic leather comprises the following steps:
(1) Uniformly mixing all raw materials of the polyurethane coating, and introducing micro bubbles generated by a micro bubble generator into the mixture to obtain foamed waterborne polyurethane slurry;
(2) And (3) dipping the non-woven fabric into the foaming waterborne polyurethane slurry, drying, and then carrying out alkali decrement treatment and post-treatment to obtain the polyurethane synthetic leather with high moisture absorption and air permeability.
Preferably, in the step (2), the impregnation amount is controlled to be 400 to 700g/m during the impregnation process 2 。
Compared with the prior art, the invention has the following advantages:
(1) In the moisture-absorbing and breathable particles, the surface of the diatomite is coated with the porous hydrophilic polymer coating layer, so that the condition that the surface of the synthetic leather is burred due to the addition of the diatomite can be prevented, and the moisture absorption and breathability of the diatomite cannot be greatly influenced;
(2) In the moisture-absorbing and breathable particles, the interior of the porous hydrophilic polymer coating layer and the covalent connection between the porous hydrophilic polymer coating layer and the diatomite can prevent the coating layer from being worn or peeled off from the surface of the diatomite in the use process of the synthetic leather, so that the synthetic leather maintains better hand feeling.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are intended only to illustrate the invention in detail and are not intended to limit the scope of the invention in any way.
Example 1
The polyurethane synthetic leather with high moisture absorption and air permeability comprises non-woven fabric base cloth and a polyurethane coating, wherein the polyurethane coating comprises the following raw materials in parts by weight: 80 parts of water-based polyurethane emulsion, 2 parts of surfactant, 5 parts of moisture-absorbing and breathable particles, 0.1 part of water-soluble cellulose thickener and 0.1 part of isocyanate cross-linking agent.
The moisture-absorbing breathable particles comprise diatomite and a porous hydrophilic polymer coating layer which is coated outside the diatomite and has the thickness of 10-20 mu m, and the preparation method comprises the following steps:
(A) And (3) diatomite surface treatment: mixing 3-aminopropyltrimethoxysilane and water according to the mass ratio of 1; adding kieselguhr with the particle size of 300-400 meshes into the coupling agent solution, wherein the mass ratio of the kieselguhr to the coupling agent solution is 1; after the reaction is finished, filtering, and then soaking in the birch tar for 1h to obtain modified diatomite;
(B) Coating with hydrophilic polymer: mixing water-soluble acrylic resin, water-soluble epoxy resin and water in a mass ratio of 4; adding modified diatomite into a coating agent solution, wherein the mass ratio of the modified diatomite to the coating agent solution is 1;
(C) Hole making and curing: and (3) placing the hydrophilic polymer coated diatomite at 60 ℃ under 0.01MPa for 40min, and then heating to 170 ℃ for curing for 2h to obtain the moisture-absorbing and breathable particles.
A preparation method of the polyurethane synthetic leather comprises the following steps:
(1) Uniformly mixing all raw materials of the polyurethane coating, and introducing micro bubbles generated by a micro bubble generator into the mixture to obtain foaming aqueous polyurethane slurry;
(2) The non-woven fabric is dipped into the foaming aqueous polyurethane slurry, and the dipping amount is controlled to be 700g/m 2 And after drying, carrying out alkali decrement treatment and surface grinding treatment to obtain the polyurethane synthetic leather with high moisture absorption and air permeability.
Example 2
The polyurethane synthetic leather with high moisture absorption and air permeability comprises a non-woven fabric base cloth and a polyurethane coating, wherein the polyurethane coating comprises the following raw materials in parts by weight: 90 parts of water-based polyurethane emulsion, 2 parts of surfactant, 8 parts of moisture-absorbing and breathable particles, 1 part of water-soluble cellulose thickener, 1 part of isocyanate cross-linking agent and 4 parts of water-based pigment paste.
The moisture-absorbing breathable particles comprise diatomite and a porous hydrophilic polymer coating layer which is coated outside the diatomite and has the thickness of 10-20 mu m, and the preparation method comprises the following steps:
(A) And (3) diatomite surface treatment: mixing 3-aminopropyltrimethoxysilane and water according to the mass ratio of 1; adding kieselguhr with the particle size of 300-400 meshes into the coupling agent solution, wherein the mass ratio of the kieselguhr to the coupling agent solution is 1; after the reaction is finished, filtering, and then soaking in birch tar for 2 hours to obtain modified diatomite;
(B) Coating with hydrophilic polymer: mixing water-soluble acrylic resin, water-soluble epoxy resin and water in a mass ratio of 4.5; adding modified diatomite into a coating agent solution, wherein the mass ratio of the modified diatomite to the coating agent solution is 1;
(C) Hole making and curing: and (3) placing the hydrophilic polymer coated diatomite at 0.02MPa and 65 ℃ for 35min, and then heating to 165 ℃ for curing for 2.5h to obtain the moisture-absorbing and breathable particles.
A preparation method of the polyurethane synthetic leather comprises the following steps:
(1) Uniformly mixing all raw materials of the polyurethane coating, and introducing micro bubbles generated by a micro bubble generator into the mixture to obtain foaming aqueous polyurethane slurry;
(2) The non-woven fabric is dipped into the foaming water-based polyurethane slurry, and the dipping amount is controlled to be 500g/m 2 And after drying, carrying out alkali decrement treatment and surface grinding treatment to obtain the polyurethane synthetic leather with high moisture absorption and air permeability.
Example 3
The polyurethane synthetic leather with high moisture absorption and air permeability comprises a non-woven fabric base cloth and a polyurethane coating, wherein the polyurethane coating comprises the following raw materials in parts by weight: 100 parts of water-based polyurethane emulsion, 6 parts of surfactant, 10 parts of moisture-absorbing and breathable particles, 2 parts of water-soluble cellulose thickener, 2 parts of isocyanate cross-linking agent and 8 parts of water-based pigment paste.
The superfine fiber is fixed island superfine fiber; the thickening agent is a polyurethane associative thickening agent; the colorant is water-based color paste and/or water-based toner.
The moisture-absorbing breathable particles comprise diatomite and a porous hydrophilic polymer coating layer which is coated outside the diatomite and has the thickness of 10-20 mu m, and the preparation method comprises the following steps:
(A) And (3) diatomite surface treatment: mixing 3-aminopropyltrimethoxysilane and water according to the mass ratio of 1; adding kieselguhr with the particle size of 300-400 meshes into the coupling agent solution, wherein the mass ratio of the kieselguhr to the coupling agent solution is 1; after the reaction is finished, filtering, and soaking in birch tar for 3 hours to obtain modified diatomite;
(B) Coating with hydrophilic polymer: mixing water-soluble acrylic resin, water-soluble epoxy resin and water in a mass ratio of 5; adding modified diatomite into a coating agent solution, wherein the mass ratio of the modified diatomite to the coating agent solution is 1;
(C) Hole making and curing: and (3) placing the hydrophilic polymer coated diatomite at 70 ℃ under 0.03MPa for 30min, heating to 160 ℃, and curing for 3h to obtain the moisture-absorbing and breathable particles.
A preparation method of the polyurethane synthetic leather comprises the following steps:
(1) Uniformly mixing all raw materials of the polyurethane coating, and introducing micro bubbles generated by a micro bubble generator into the mixture to obtain foaming aqueous polyurethane slurry;
(2) The non-woven fabric is dipped into the foaming water-based polyurethane slurry, and the dipping amount is controlled to be 400g/m 2 And after drying, carrying out alkali decrement treatment and surface grinding treatment to obtain the polyurethane synthetic leather with high moisture absorption and air permeability.
Comparative example 1
The comparative example is different from example 1 only in that no moisture-absorbing and breathable particles are added to the polyurethane synthetic leather.
Comparative example 2
This comparative example differs from example 1 only in that the hygroscopic, air-permeable particles are diatomaceous earth having a particle size of 300 to 400 mesh.
Comparative example 3
The present comparative example is different from example 1 only in that the impregnation of birch tar was not performed in step (a) during the preparation of the moisture-absorbing, breathable particles.
Comparative example 4
This comparative example differs from example 1 only in that during the preparation of the hygroscopic, breathable particles, step (C) is replaced by: and (3) placing the hydrophilic polymer coated diatomite at 0.07MPa and 165 ℃ for 2.5h to obtain the moisture absorption breathable particles. .
Comparative example 5
This comparative example only differs from example 1 in that 3-aminopropyltrimethoxysilane was replaced by gamma-methacryloxypropyltrimethoxysilane in step (a) during the preparation of the hygroscopic breathable particles.
Comparative example 6
This comparative example differs from example 1 only in that no curing is carried out in step (C) during the preparation of the hygroscopic breathable particles.
Leather Performance test
The polyurethane leathers obtained in examples 1 to 3 and comparative examples 1 to 6 were subjected to air permeability, water absorption and a hairy feeling test.
And (3) testing air permeability: and (3) detecting the air permeability of the polyurethane synthetic leather according to a QB/T2799-2006 leather air permeability measuring method.
Water absorption test: and (3) detecting the water absorption degree of the polyurethane synthetic leather according to GB/T4689.21-2008 determination of static water absorption of leather physical and mechanical tests.
And (3) burr feeling test: dividing the burr feeling of the polyurethane synthetic leather into 5 grades of superior, good, middle, poor and inferior according to subjective judgment of a leather expert group, respectively marking the grades as 5, 4, 3, 2 and 1, determining standard samples of the grades, then carrying out burr feeling test on the sample by 5 experts and 15 volunteers according to the 5 grades, and taking an average value after scoring in 0-5 minutes; referring to a method in GB/T21196-2007 determination of the abrasion resistance of fabrics by the Martindale method, after 5000 times of rubbing, the burr feeling is tested again.
The results of the measurements are shown in the following table:
Figure 56271DEST_PATH_IMAGE002
the following conclusions can be drawn by analyzing the detection results:
(1) The permeability and water absorption of the synthetic leather of comparative example 1 are obviously lower than those of example 1, which shows that the moisture absorption and air permeability of the polyurethane synthetic leather can be effectively improved after the moisture absorption and air permeability particles are added, and the reason is that the moisture absorption and air permeability particles have higher hydrophilicity and porosity.
(2) The burr feeling of the synthetic leather of the comparative example 2 is obviously higher than that of the synthetic leather of the example 1, and the air permeability and the water absorption are not obviously different, which shows that after the surface of the diatomite is coated with the hydrophilic polymer layer, the hand feeling of the synthetic leather can be improved, and the moisture absorption and air permeability of the synthetic leather cannot be greatly influenced, and the reason is that the hydrophilic polymer layer has higher flexibility compared with the diatomite, so that the hand feeling of the surface of the moisture absorption and air permeability particles can be improved, and the burr feeling of the surface of the synthetic leather after the hydrophilic polymer layer is added is prevented; in addition, the coating layer adopts hydrophilic polymers and has high porosity, so that the moisture absorption and air permeability of the diatomite are not greatly influenced.
(3) The reason why the air permeability and water absorption of the synthetic leather of comparative example 3 are significantly lower than those of example 1 indicates that the moisture absorption and air permeability of the polyurethane synthetic leather can be improved by performing low-pressure high-temperature treatment before curing after coating with the hydrophilic polymer in the preparation process of the moisture absorption and air permeability particles is that, during the low-pressure high-temperature treatment, birch tar in the diatomite volatilizes rapidly and a large gap can be formed in the hydrophilic polymer coating layer, thereby preventing the polymer coating from causing large influence on the moisture absorption and air permeability of the diatomite.
(4) The synthetic leather of comparative example 4 has significantly lower air permeability and water absorption than example 1, which shows that if birch tar volatilization and polymer coating layer curing are combined into one step in the preparation process of the moisture-absorbing and air-permeable particles, the moisture absorption and air permeability of the polyurethane synthetic leather are reduced, because: in the curing process, the crosslinking strength of the polymer coating layer is gradually increased, so that the pore-forming effect of the volatilization of the birch tar is reduced, the porosity of the polymer coating layer is low, and the moisture absorption and the air permeability of the diatomite are greatly influenced.
(5) The reason why the burred feeling after the friction of the synthetic leather of comparative example 5 is significantly higher than that of example 1 is that 3-aminopropyltrimethoxysilane can form covalent bonding with the diatomaceous earth and the epoxy resin in the polymer coating layer, thereby improving the bonding strength of the porous hydrophilic polymer coating layer on the surface of the diatomaceous earth and preventing it from being worn away or falling off from the surface of the diatomaceous earth to expose the diatomaceous earth during the friction.
(6) The reason why the burr feeling after friction of the synthetic leather of comparative example 6 is significantly higher than that of example 1 is that the curing enables covalent crosslinking to be formed between the epoxy resin and the acrylic resin, thereby preventing the polymer coating layer from being abraded to expose the diatomaceous earth when the synthetic leather is subjected to friction.
Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that the embodiments may be modified or changed without departing from the spirit of the present invention within the scope of the appended claims.

Claims (8)

1. The polyurethane synthetic leather with high moisture absorption and air permeability comprises non-woven fabric base cloth and a polyurethane coating, and is characterized in that the polyurethane coating comprises the following raw materials in parts by weight: 80-100 parts of water-based polyurethane emulsion, 2-6 parts of surfactant, 5-10 parts of moisture-absorbing breathable particles, 0.1-2 parts of water-soluble cellulose thickener, 0.1-2 parts of isocyanate cross-linking agent and 0-8 parts of water-based colorant; the moisture-absorbing and breathable particles comprise diatomite and a porous hydrophilic polymer coating layer coated outside the diatomite;
in the moisture absorption breathable particles, the particle size of diatomite is 300-400 meshes, and the thickness of the porous hydrophilic polymer coating layer is 10-20 mu m;
the preparation method of the moisture-absorbing breathable particles comprises the following steps:
(A) And (3) diatomite surface treatment: mixing 3-aminopropyltrimethoxysilane and water according to the mass ratio of 1; adding diatomite into the coupling agent solution, fully dispersing, and stirring and reacting for 1-2h at the temperature of 30-50 ℃; after the reaction is finished, filtering, and then soaking in the birch tar for 1-3h to obtain modified diatomite;
(B) Coating with hydrophilic polymer: dissolving water-soluble acrylic resin and water-soluble epoxy resin in water to prepare a coating agent solution; adding the modified diatomite into the coating agent solution, stirring for 2-3h after fully dispersing, and filtering to obtain hydrophilic polymer coated diatomite;
(C) Hole making and curing: placing the hydrophilic polymer coated diatomite at 60-70 deg.C under 0.01-0.03MPa for 30-40min, heating to 160-170 deg.C, and curing for 2-3h to obtain moisture-absorbing air-permeable particles;
the preparation method of the polyurethane synthetic leather comprises the following steps:
(1) Uniformly mixing all raw materials of the polyurethane coating, and introducing micro bubbles generated by a micro bubble generator into the mixture to obtain foamed waterborne polyurethane slurry;
(2) And (3) dipping the non-woven fabric into the foaming waterborne polyurethane slurry, drying, and then carrying out alkali decrement treatment and post-treatment to obtain the polyurethane synthetic leather with high moisture absorption and air permeability.
2. The polyurethane synthetic leather according to claim 1, wherein in the step (A), the mass ratio of the diatomite to the coupling agent solution is 1.
3. The polyurethane synthetic leather according to claim 1, wherein in the step (B), the mass ratio of the water-soluble acrylic resin, the water-soluble epoxy resin and the water in the coating agent solution is 4-5.
4. The polyurethane synthetic leather according to claim 1, wherein in the step (B), the mass ratio of the modified diatomite to the coating agent solution is 1.
5. The polyurethane synthetic leather of claim 1 wherein the surfactant is sodium lauryl sulfate.
6. The polyurethane synthetic leather of claim 1 wherein the solid content of the aqueous polyurethane emulsion is 20-40wt%.
7. A method for preparing a polyurethane synthetic leather according to any one of claims 1 to 6, comprising the following steps:
(1) Uniformly mixing all raw materials of the polyurethane coating, and introducing micro bubbles generated by a micro bubble generator into the mixture to obtain foaming aqueous polyurethane slurry;
(2) And (3) dipping the non-woven fabric into the foaming waterborne polyurethane slurry, drying, and then carrying out alkali decrement treatment and post-treatment to obtain the polyurethane synthetic leather with high moisture absorption and air permeability.
8. The method according to claim 7, wherein in the step (2), the impregnation amount is controlled to 400 to 700g/m during the impregnation 2 。
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