CN115538188B - Low-odor water-based antifouling polyurethane synthetic leather and preparation method and application thereof - Google Patents

Low-odor water-based antifouling polyurethane synthetic leather and preparation method and application thereof Download PDF

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CN115538188B
CN115538188B CN202211384026.1A CN202211384026A CN115538188B CN 115538188 B CN115538188 B CN 115538188B CN 202211384026 A CN202211384026 A CN 202211384026A CN 115538188 B CN115538188 B CN 115538188B
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polyurethane
parts
antifouling
synthetic leather
layer
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CN115538188A (en
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笪丽红
盛海波
刘志球
张思雨
胡兆阳
夏俊龙
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Anhui Anli Material Technology Co Ltd
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Anhui Anli Material Technology 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
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    • 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
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    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/0056—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the compounding ingredients of the macro-molecular coating
    • D06N3/0063—Inorganic compounding ingredients, e.g. metals, carbon fibres, Na2CO3, metal layers; Post-treatment with inorganic compounds
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    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/007—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by mechanical or physical treatments
    • D06N3/0075—Napping, teasing, raising or abrading of the resin coating
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    • 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
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    • 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
    • D06N3/146—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 characterised by the macromolecular diols used
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    • 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
    • D06N3/147—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 characterised by the isocyanates used
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    • D06N2209/00—Properties of the materials
    • D06N2209/14—Properties of the materials having chemical properties
    • D06N2209/146—Soilproof, soil repellent
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    • D06N2209/16—Properties of the materials having other properties
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    • D06N2211/00—Specially adapted uses
    • D06N2211/12—Decorative or sun protection articles
    • D06N2211/28—Artificial leather
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    • D06N2213/00—Others characteristics
    • D06N2213/03—Fibrous web coated on one side with at least two layers of the same polymer type, e.g. two coatings of polyolefin

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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)

Abstract

The invention discloses a low-odor waterborne antifouling polyurethane synthetic leather, a preparation method and application thereof, wherein the polyurethane synthetic leather sequentially comprises a waterborne polyurethane antifouling layer, a polyurethane surface layer, a solvent-free polyurethane bonding layer and a substrate layer from top to bottom; the aqueous polyurethane antifouling layer is prepared from the following aqueous polyurethane antifouling layer slurry consisting of the following components in parts by weight: 50-100 parts of aqueous polyurethane, 10-15 parts of nitrogen pyridine type curing agent, 5-10 parts of dispersing agent, 4-5 parts of color paste and 2-3 parts of silane coupling agent organically modified mesoporous silica. According to the invention, the low-odor environment-friendly antifouling polyurethane synthetic leather is prepared by adopting the water-based antifouling treatment and adding the organically modified mesoporous silica into the water-based antifouling layer for deodorizing. The prepared product has good environmental protection property and durability, and can be applied to the fields of household and engineering decoration polyurethane synthetic leather.

Description

Low-odor water-based antifouling polyurethane synthetic leather and preparation method and application thereof
Technical Field
The invention relates to a preparation process of functional polyurethane, in particular to low-odor water-based antifouling polyurethane synthetic leather and a preparation method and application thereof, and belongs to the technical field of polyurethane synthetic leather.
Background
Polyurethane synthetic leather materials are widely used in sofa home and engineering decoration due to durability, comfort and easy processing, and the characteristics of softness, skin friendliness and easy decoration are well tolerated by modern home decoration.
With the improvement of the living standard of people, products such as sofa home furnishings, engineering decorations and the like are inevitably polluted by various solvents, cosmetics, coffee, greasy dirt, ball pens and the like. The surface of the general polyurethane synthetic leather is not easy to decontaminate after being polluted, so that the performance of the product is reduced. Thus, polyurethane synthetic leather having an antifouling function is popular.
The traditional antifouling technology is to carry out surface treatment on polyurethane synthetic leather by using an oily antifouling coating. The oily antifouling coating has the advantages of good bonding force with the polyurethane dry surface layer, outstanding antifouling performance and good durability. However, the traditional oily antifouling coating can emit organic solvent, has extremely large smell and exceeds the standard of VOC, and not only causes serious pollution to the production environment and the surrounding living environment, but also affects the production and the physical health of users. Therefore, the development of low-odor environment-friendly antifouling polyurethane synthetic leather has great value. Therefore, the aqueous anti-fouling technology enters the field of view, but the surface tension difference between the aqueous anti-fouling coating and the polyurethane dry surface layer is large, the combination of the aqueous anti-fouling coating and the polyurethane dry surface layer is poor, and further the durability and durability of the product are poor, so that the combination strength of the aqueous anti-fouling coating and the polyurethane dry surface layer is improved. Meanwhile, the water-based polyurethane antifouling layer is not completely odorless, and further deodorizing treatment is required to be carried out on the product in order to ensure the low odor of the product.
Disclosure of Invention
In view of the above, the present invention provides a preparation method of polyurethane synthetic leather for low-odor water-based antifouling home and engineering decoration, which solves the problems of the prior art. According to the invention, an aqueous antifouling technology is adopted to form an antifouling coating on the surface of polyurethane synthetic leather, and mesoporous silica organically modified by a silane coupling agent is added into the aqueous antifouling coating for modification, so that the low-odor environment-friendly antifouling polyurethane synthetic leather is prepared.
The aim of the invention is realized by the following technical scheme:
the first aspect of the invention provides a low-odor aqueous antifouling polyurethane synthetic leather, which sequentially comprises an aqueous polyurethane antifouling layer, a polyurethane surface layer, a solvent-free polyurethane bonding layer and a substrate layer from top to bottom, wherein:
the aqueous polyurethane antifouling layer is prepared from the following aqueous polyurethane antifouling layer slurry consisting of the following components in parts by weight: 50-100 parts of aqueous polyurethane, 10-15 parts of nitrogen pyridine type curing agent, 5-10 parts of dispersing agent, 4-5 parts of color paste and 2-3 parts of silane coupling agent organically modified mesoporous silica. Further, the dispersing agent is polyether modified polydimethylsiloxane; the preparation method of the silane coupling agent organically modified mesoporous silica comprises the following steps: adding mesoporous silica into 2.5 mass percent of aqueous solution of a silane coupling agent, treating, stirring for 20-30 minutes at 70 ℃, and drying to obtain the silane coupling agent modified mesoporous silica; the silane coupling agent is preferably KH550.
The polyurethane surface layer is prepared from the following polyurethane surface layer slurry consisting of the following components in parts by weight: 100 parts of polyester polyurethane resin, 2-4 parts of wear-resistant auxiliary agent, 4-6 parts of curing agent and 1-5 parts of color paste.
The solvent-free polyurethane bonding layer is prepared from the following solvent-free polyurethane bonding layer slurry consisting of the following components in parts by weight: 100 parts of polyester polyol, 50-60 parts of isocyanate, 20-30 parts of inorganic filler, 0.10-0.15 part of organic metal catalyst and 0.05 part of amine catalyst.
A second aspect of the present invention provides a method for preparing the low-odor aqueous antifouling polyurethane synthetic leather according to the first aspect, comprising the steps of:
step 1: coating polyurethane surface layer slurry on release paper, wherein the coating thickness is 0.1-0.2mm, and drying and forming at 130-135 ℃ to obtain a polyurethane surface layer;
step 2: coating solvent-free polyurethane adhesive layer slurry on the polyurethane surface layer, wherein the coating thickness is 0.2-0.3mm, and pre-reacting for 2-4min at 105-110 ℃ to form a semi-dry polyurethane adhesive layer, and the polyurethane adhesive layer has certain cohesiveness;
step 3: attaching a base material on the semi-dry polyurethane adhesive layer, heating and curing at 135-145 ℃, preserving heat for 3-6min, and stripping off release paper to obtain a polyurethane synthetic leather dry semi-finished product;
step 4: and (3) carrying out roller coating treatment on the surface of the polyurethane surface layer of the dry semi-finished product by adopting aqueous polyurethane antifouling layer slurry at the temperature of 100-120 ℃, and preserving heat for 2-3 minutes to obtain the low-odor aqueous antifouling polyurethane synthetic leather.
A third aspect of the present invention provides the use of a low odor aqueous antifouling polyurethane synthetic leather as described in the first aspect, which can be used for household and decorative materials.
Compared with the prior art, the invention has the beneficial effects that:
the invention adopts the full-aqueous polyurethane coating, and the antifouling is mainly realized by forming a compact polyurethane coating by the polyurethane aqueous surface layer and the nitrogen pyridine curing agent. Meanwhile, the surface tension of the water-based coating is changed by adopting the mesoporous silica organically modified by the silane coupling agent, so that the antifouling effect is improved, the mesoporous silica can also serve as an odor adsorbent, and the odor of a product is fundamentally reduced; in addition, the wear-resisting agent also has a certain wear-resisting enhancing effect, and the wear-resisting property of the product is improved. Meanwhile, the polyester polyurethane with larger cohesive energy is adopted as a surface layer material, and can form a large number of hydrogen bond structures with the silane coupling agent KH550 in the aqueous polyurethane anti-fouling coating, so that the combination property between the polyurethane surface layer and the aqueous polyurethane anti-fouling layer is ensured, and the defect of poor combination of the common aqueous anti-fouling coating and the common polyurethane synthetic leather dry layer is overcome.
The product obtained by the invention not only meets the increasingly strict environmental protection requirements of brand home and engineering decoration, but also can effectively improve the wear resistance and color fastness of the product and greatly prolong the service life of the product while ensuring the antifouling and decontamination effects. The product can meet the hydrolysis resistance requirement for 5 years (70 ℃ below zero 95% RH 5W leather surface is not cracked and pulverized); the antifouling rate is more than or equal to level 4 (the common oily ball-point pen plays the dry cleaning of the terry cloth; wesbo wear-resisting for 10 ten thousands of times without breaking; the dry and wet wiping color fastness is 500 times or more than grade 4; the peeling strength is more than or equal to 30N/3cm, the normal temperature flexibility is realized, and the cracking is avoided for 5 ten thousand times; the odor grade is less than or equal to 3.0.
Detailed Description
The present invention will be further described with reference to examples, which are not intended to be limiting, so that those skilled in the art will better understand the present invention and practice it.
In addition, the preparation processes in the following examples are conventional means in the art unless specifically described, and therefore, will not be described in detail; the parts in the following embodiments refer to parts by weight.
The raw material information used in the following examples is as follows:
the manufacturer of the water-based polyurethane resin is smoke counter Wanhua chemistry with the brand number of3920；
The nitrogen pyridine type curing agent is manufactured by the manufacturer of Guangzhou Stockout, and the brand is SILOK 150;
the brand of the silane coupling agent is KH550, and the manufacturer is Jinan Huijian chemical industry Co., ltd;
the mesoporous silica microsphere has the particle size of 50nm and the concentration of 5mg/ml, and the manufacturer is Nanjing Dongna biotechnology Co., ltd, and the brand is MSNs-5;
the dispersant is polyether modified polydimethylsiloxane, and the manufacturer is Pick chemistry with the brand number of BYK-333;
the manufacturer of the COLOR paste is Kunshan corn, and the brand of the COLOR paste is WUB COLOR series COLOR paste;
the manufacturer of the polyester polyurethane resin is Huafeng chemical with the mark of JF-S-8120;
the polyether polyurethane surface layer resin manufacturer in comparative example 2 is Shanghai Hui, and the brand is HDS-80A;
the wear-resistant additive manufacturer is Meiliken in Zhongshan and has the brand BNK-NSF898;
the curing agent is HDI, the manufacturer is Wanhua chemistry, and the brand is wanna teht-100;
the polyester polyol is manufactured by Basiff polyurethane (Chinse:Sub>A) Co., ltd, and the brand of the polyester polyol is polyol composite material CC 6945/1505C-A;
the isocyanate is a polyester MDI prepolymer, and the manufacturer is Basoff polyurethane (China) Limited company, and the brand is HAPTEX CC 6945/1505C-B;
the inorganic filler is heavy calcium carbonate, and the manufacturer is Changxing Qing Sheng calcium industry Co.Ltd;
the organometal catalyst is an organobismuth catalyst, and the manufacturer is De-phonochemical with the brand DY-20;
the amine catalyst is tertiary amine catalyst, and the manufacturer is basf polyurethane (China) Limited company with the brand CX 93600;
the above reagents are merely illustrative of the sources and ingredients of the reagents used in the experiments of the invention and are well disclosed and do not represent the inability to practice the invention using other reagents of the same type or provided by other suppliers.
Example 1
A preparation method of polyurethane synthetic leather for water-based antifouling home and engineering decoration comprises the following steps:
step 1: coating polyurethane surface layer slurry on release paper, wherein the coating thickness is 0.1mm, and drying at 130 ℃ for 1.5min to form a polyurethane surface layer; wherein: the polyurethane surface layer slurry consists of 100 parts of Huafeng JF-S-8120, 2 parts of Meiliken BNK-NSF898 wear-resistant auxiliary agent, 4 parts of Wanna teht-100 of Wanhua chemistry and 1 part of corn black paste which are mixed according to parts by weight.
Step 2: coating polyurethane bonding layer slurry on the polyurethane surface layer, wherein the coating thickness of the polyurethane bonding layer slurry is 0.2mm; pre-reacting for 2min at 105 ℃ to form a semi-dry polyurethane bonding layer, wherein the polyurethane bonding layer has certain cohesiveness; wherein: the polyurethane bonding layer slurry comprises 100 parts of polyester polyol, 50 parts of isocyanate, 20 parts of inorganic filler, 0.10 part of organic metal catalyst and 0.05 part of amine catalyst;
step 3: attaching a 0.8mm full polyester cloth base on the semi-dry polyurethane bonding layer, heating and curing at 135 ℃, preserving heat for 6min, and stripping off release paper to obtain a polyurethane synthetic leather dry semi-finished product;
step 4: and (3) coating the waterborne antifouling polyurethane slurry on the surface of a polyurethane surface layer on the basis of the dry semi-finished product, and fully crosslinking and curing for 3min at the temperature of 100 ℃ to obtain the low-odor waterborne antifouling polyurethane synthetic leather for home and engineering decoration. Wherein: the composition of the aqueous antifouling polyurethane slurry is that50 parts of Wanhua chemistry3920 10 parts of SILOK 150 curing agent, 5 parts of BYK-333 dispersing agent, 4 parts of corn black paste and 3 parts of KH550 organically modified mesoporous silica; the preparation method of KH550 organic modified mesoporous silica comprises the following steps: adding mesoporous silica into 2.5 mass percent KH550 aqueous solution for treatment, stirring for 20-30 minutes at 70 ℃, and drying to obtain KH550 modified mesoporous silica.
Example 2
A preparation method of polyurethane synthetic leather for water-based antifouling home and engineering decoration comprises the following steps:
step 1: coating polyurethane surface layer slurry on release paper, coating the slurry with the thickness of 0.2mm, and drying the slurry at 135 ℃ for 2.5min to form a polyurethane surface layer; wherein: the polyurethane surface layer slurry consists of 100 parts of Huafeng JF-S-8120, 4 parts of Meiliken BNK-NSF898 wear-resistant auxiliary agent, 6 parts of Wanna teht-100 of Wanhua chemistry and 5 parts of corn black paste which are mixed according to parts by weight.
Step 2: coating polyurethane bonding layer slurry on the polyurethane surface layer, wherein the coating thickness of the polyurethane bonding layer slurry is 0.3mm; pre-reacting for 4min at 110 ℃ to form a semi-dry polyurethane bonding layer, wherein the polyurethane bonding layer has certain cohesiveness; wherein: the polyurethane bonding layer slurry comprises 100 parts of polyester polyol, 60 parts of isocyanate, 30 parts of inorganic filler, 0.15 part of organic metal catalyst and 0.05 part of amine catalyst;
step 3: attaching a 0.8mm full polyester cloth base on the semi-dry polyurethane bonding layer, heating and curing at 135 ℃, preserving heat for 6min, and stripping off release paper to obtain a polyurethane synthetic leather dry semi-finished product;
step 4: and (3) coating the dry semi-finished product by adopting aqueous antifouling polyurethane slurry, and fully crosslinking and curing for 3min at the temperature of 100 ℃ to obtain the low-odor aqueous antifouling polyurethane synthetic leather for home and engineering decoration. Wherein: the composition of the aqueous antifouling polyurethane slurry is 100 parts of Wanhua chemistry3920 10 parts of SILOK 150 curing agent, 5 parts of BYK-333 dispersing agent, 4 parts of corn black paste and 2 parts of KH550 organically modified mesoporous silica; the preparation method of KH550 organic modified mesoporous silica comprises the following steps: adding mesoporous silica into 2.5 mass percent KH550 aqueous solution for treatment, stirring for 20-30 minutes at 70 ℃, and drying to obtain KH550 modified mesoporous silica.
Comparative example 1
Comparative example 1 the comparative example 1 differs from example 1 only in that an oily antifouling resin slurry, which is a colorless slurry used in "CN103556471B a production method of a foggy-surface soil release polyurethane synthetic leather", was used in step 4; the concrete composition is as follows: 70 parts of acrylic ester modified polyurethane prepolymer; 2 parts of curing agent HDI biuret; 5 parts of triethylenediamine; 20 parts of N, N-dimethylformamide.
Other processes were consistent with example 1.
Comparative example 2
Comparative example 1 differs from example 1 only in that a conventional polyether profile resin was used in step 1, and the other processes were consistent with example 1.
Comparative example 3
Comparative example 3 the only difference of comparative example 3 compared to example 1 is that no KH550 organically modified mesoporous silica was added in step 4.
Comparative example 4
Comparative example 4 differs from example 1 only in that mesoporous silica (not modified with KH 550) was added in step 4.
The products prepared in the above examples and comparative examples were subjected to performance tests, and the test results are shown in Table 1 below:
TABLE 1 Performance test results
As can be seen from a comparison of example 1 and comparative example 1 in table 1, the aqueous anti-fouling formulation has better odor and better VOC emissions than the crude oil anti-fouling formulation. From the comparison of the example 1, the comparative example 2, the comparative example 3 and the comparative example 4, the silane coupling agent KH550 in the aqueous anti-fouling coating plays a role in modifying mesoporous silica, ensures the dispersibility of the mesoporous silica, can interact with polyester polyurethane in the surface layer to promote the combination of the anti-fouling coating and the polyurethane surface layer of the product, and ensures the durability of the product. From example 1, comparative example 3 and comparative example 4, it can be seen that the odor of the product is further improved due to the adsorption of the mesoporous silica, which also has the ability to increase the abrasion resistance of the product. In summary, the low-odor water-based antifouling polyurethane synthetic leather with good durability is obtained by adjusting the formula of each layer.
It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Claims (7)

1. The low-odor water-based antifouling polyurethane synthetic leather is characterized in that: the waterproof coating comprises a water-based polyurethane antifouling layer, a polyurethane surface layer, a solvent-free polyurethane bonding layer and a substrate layer from top to bottom in sequence, wherein the water-based polyurethane antifouling layer is prepared from the following water-based polyurethane antifouling layer slurry consisting of the following components in parts by weight: 50-100 parts of aqueous polyurethane, 10-15 parts of nitrogen pyridine type curing agent, 5-10 parts of dispersing agent, 4-5 parts of color paste and 2-3 parts of silane coupling agent organically modified mesoporous silica;
the preparation method of the silane coupling agent organically modified mesoporous silica comprises the following steps: adding mesoporous silica into a silane coupling agent aqueous solution for treatment, and drying to obtain silane coupling agent modified mesoporous silica; the silane coupling agent is KH550;
the polyurethane surface layer is prepared from the following polyurethane surface layer slurry consisting of the following components in parts by weight: 100 parts of polyester polyurethane resin, 2-4 parts of wear-resistant auxiliary agent, 4-6 parts of curing agent and 1-5 parts of color paste.
2. The low odor aqueous antifouling polyurethane synthetic leather according to claim 1, wherein: the dispersing agent is polyether modified polydimethylsiloxane.
3. The low odor aqueous antifouling polyurethane synthetic leather according to claim 1, wherein: the solvent-free polyurethane bonding layer is prepared from the following solvent-free polyurethane bonding layer slurry consisting of the following components in parts by weight: 100 parts of polyester polyol, 50-60 parts of isocyanate, 20-30 parts of inorganic filler, 0.10-0.15 part of organic metal catalyst and 0.05 part of amine catalyst.
4. A method for producing a low odor aqueous antifouling polyurethane synthetic leather according to any of claims 1 to 3, wherein: the method comprises the following steps:
step 1: coating polyurethane surface layer slurry on release paper, and drying and forming at 130-135 ℃ to obtain a polyurethane surface layer;
step 2: coating solvent-free polyurethane bonding layer slurry on the polyurethane surface layer, and pre-reacting for 2-4min at 105-110 ℃ to form a semi-dry polyurethane bonding layer;
step 3: attaching a base material on the semi-dry polyurethane adhesive layer, heating and curing at 135-145 ℃, preserving heat for 3-6min, and stripping off release paper to obtain a polyurethane synthetic leather dry semi-finished product;
step 4: and (3) carrying out roller coating treatment on the surface of the polyurethane surface layer of the dry semi-finished product by adopting aqueous polyurethane antifouling layer slurry at the temperature of 100-120 ℃, and preserving heat for 2-3 minutes to obtain the low-odor aqueous antifouling polyurethane synthetic leather.
5. The method for preparing the low-odor aqueous antifouling polyurethane synthetic leather according to claim 4, wherein the method comprises the following steps: the coating thickness of the polyurethane surface layer slurry is 0.1-0.2mm.
6. The method for preparing the low-odor aqueous antifouling polyurethane synthetic leather according to claim 4, wherein the method comprises the following steps: the coating thickness of the solvent-free polyurethane bonding layer slurry is 0.2-0.3mm.
7. A low odor aqueous antifouling polyurethane synthetic leather as claimed in any of claims 1 to 3 for home and decorative materials.
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