WO2021129813A1

WO2021129813A1 - Synthetic leather for children's product and preparation method therefor

Info

Publication number: WO2021129813A1
Application number: PCT/CN2020/139474
Authority: WO
Inventors: 高准; 高金岗; 张卫松
Original assignee: 华伦皮塑（苏州）有限公司
Priority date: 2019-12-26
Filing date: 2020-12-25
Publication date: 2021-07-01
Also published as: CN111172773A; CN111172773B

Abstract

The invention relates to a synthetic leather for a children's product and a preparation method therefor. The synthetic leather comprises a base cloth layer, a PU bottom layer and a PU surface layer arranged in sequence, wherein the base cloth layer and the PU bottom layer are adhered by a TPU adhesive layer, wherein the raw material of the TPU adhesive layer is composed of TPU particles and an auxiliary, wherein the auxiliary accounts for 0.05-0.5% of the total weight of the raw material of the TPU adhesive layer and the TPU particle is WHT-8170. In the synthetic leather for a children's product of the present invention, the PU bottom layer and the base cloth are adhered by selecting specific TPU particles combined with an auxiliary, and by optimizing the formulations of the PU bottom layer and surface layer, the prepared synthetic leather not only meets the 24 environmental protection requirements of PAHS, meets the latest environmental protection requirements and meets requirements for export, but can also be used for an export children's product and reduces the production cost of a children's product, and also, the synthetic leather has performances such as high wear resistance and hydrolysis resistance.

Description

Synthetic leather for children's articles and preparation method thereof

Technical field

The invention belongs to the technical field of synthetic leather, and specifically relates to a synthetic leather for children's products and a preparation method thereof.

Background technique

Synthetic leather used in the field of children's products is currently commonly used ordinary PU synthetic leather, which usually includes a PU composite layer composed of a PU surface layer and a PU bottom layer and a base fabric layer. The base fabric layer and the PU bottom layer are bonded by a water-based PU adhesive. However, most of the existing water-based PU adhesives have VOC volatilization problems. Therefore, the PU synthetic leather used in the existing children's products is difficult to meet the PAHS24 EU testing standards in terms of environmental protection, especially for children's products to be exported. Environmental protection requirements are very high. The existing PU synthetic leather cannot be used in export children's products because it does not meet the export standards for environmental protection, but can only be used in ordinary children's products with lower environmental protection requirements. The leather used in children's products that need to be exported is mostly made of silica gel, but the price of silicone-based leather is expensive, resulting in high costs for exported children's products.

Summary of the invention

The purpose of the present invention is to provide an improved synthetic leather for children's products and a preparation method thereof in order to overcome the shortcomings of the prior art.

In order to achieve the above objective, the technical solution adopted by the present invention is:

A synthetic leather for children's products. The synthetic leather comprises a base cloth layer, a PU bottom layer and a PU surface layer arranged in sequence, and the base cloth layer and the PU bottom layer are bonded together by a TPU adhesive layer, wherein the TPU The raw material of the adhesive layer is composed of TPU particles and an auxiliary agent, and the auxiliary agent accounts for 0.05-0.5% of the total weight of the raw material of the TPU adhesive layer, and the TPU particles are WHT-8170.

In a further embodiment, the auxiliary agent is a leveling agent.

In a further embodiment, based on parts by weight, the raw material formula of the PU surface layer includes the following components:

The first PU resin is SK-50.

In a further embodiment, the solvent used in the PU surface layer is ethyl ester.

In a further embodiment, based on parts by weight, the raw material formula of the PU bottom layer includes the following components:

The second PU resin is 9531.

In a further embodiment, the solvent used in the PU bottom layer is ethyl ester.

In a further embodiment, the base cloth layer uses 100D healthy cloth.

In a further embodiment, the children's product includes a child seat and a stroller armrest.

Another technical solution adopted by the present invention is: the above-mentioned preparation method of synthetic leather for children's products, the preparation method includes the following steps:

(1) According to the formula, mix and stir uniformly the first PU resin, solvent, colorant and leveling agent to prepare a first mixed slurry, coat the first mixed slurry on the surface of the release paper, and dry , Forming a PU surface layer;

(2) According to the formula, mix and stir the second PU resin, solvent, colorant and leveling agent uniformly to prepare a second mixed slurry, and coat the second mixed slurry on the PU prepared in step (1) Dry the surface of the surface layer to form a PU bottom layer on the PU surface layer to obtain a PU dry film;

(3) According to the formula, mix the TPU particles and additives, melt extrusion coating on the surface of the PU bottom layer of the PU dry film prepared in step (2), and then press the composite base fabric in the molten state, cool, and then A TPU adhesive layer is formed between the cloth and the PU bottom layer, and the release paper is separated to obtain the synthetic leather finished product.

In a further embodiment, in step (3), the temperature of the pressurized compound in the molten state is 190±5° C., and the pressure is 3±0.5 KG. .

In a further embodiment, in step (3), the TPU particles are first dried so that the moisture content is not higher than 0.02%.

In a further embodiment, in step (1), the color material used in the first mixture is dried first, so that the moisture content is not higher than 0.02%.

In a further embodiment, in step (2), the color material used in the second mixture is dried first, so that the moisture content is not higher than 0.02%.

Before processing, after the TPU particles and pigments are thoroughly dried, the resulting film is smooth and uniform.

Due to the application of the above technical solutions, the present invention has the following advantages compared with the prior art:

The synthetic leather for children's products of the present invention is matched with the PU bottom layer and base fabric by selecting specific TPU particles and auxiliary agents, and by optimizing the formula of the PU bottom layer and the surface layer, the prepared synthetic leather not only meets the PAHS environmental protection 24 requirements, It meets the latest environmental protection requirements and meets export requirements. It can be used for exporting children's products and reduce the production cost of children's products. The synthetic leather also has high wear resistance and hydrolysis resistance.

The synthetic leather of the present invention is a synthetic leather prepared by combining TPU and PU resin. The product can meet customer needs in terms of color and texture, and can be made in various surface styles. The release paper provided can be made in various lines and colors. Compared with a single TPU product, it makes the product more colorful.

Detailed ways

The specific implementation of the present invention will be further described in detail below in conjunction with specific embodiments, but the implementation and protection scope of the present invention is not limited to this.

Example 1

The synthetic leather for children's products provided in this embodiment includes a base cloth layer, a PU bottom layer and a PU surface layer arranged in sequence, and a TPU adhesive layer is passed between the base cloth layer and the PU bottom layer.

The raw material formula of the TPU bonding layer is 100 parts TPU particles and 0.2 parts leveling agent, TPU particles are WHT-8170, purchased from Wanhua Company; leveling agent is BYK-9565, purchased from Stahl.

The raw material formula of the PU surface layer is 100 parts of SK-50 PU resin, 80 parts of ethyl ester, 4 parts of 234s pigment and 0.2 part of BYK-9565 leveling agent. Among them, SK-50 comes from Huafeng, and 234s pigment comes from Huapu.

The raw material formula of the PU bottom layer is 100 parts of 9531 PU resin, 80 parts of ethyl ester, 4 parts of 234s pigment and 0.2 part of BYK-9565 leveling agent. Among them, 9531 PU resin comes from Hexin.

The base cloth layer adopts 100D healthy cloth.

The synthetic leather is prepared through the following steps:

(1) According to the formula, mix and stir the first PU resin, solvent, colorant and leveling agent uniformly to prepare a first mixed slurry. The first mixed slurry is coated on the surface of the release paper and dried to form PU surface layer;

(2) According to the formula, mix and stir the second PU resin, solvent, colorant and leveling agent uniformly to prepare a second mixed slurry, and coat the second mixed slurry on the PU surface layer prepared in step (1) Dry the surface to form a PU bottom layer on the PU surface layer to obtain a PU dry film;

(3) According to the formula, mix the TPU particles and additives, melt extrusion coating on the surface of the PU bottom layer of the PU dry film prepared in step (2), and then press the composite base fabric in the molten state, cool, and then A TPU adhesive layer is formed between the cloth and the PU bottom layer, and the release paper is separated to obtain a synthetic leather product;

In step (3), the temperature of pressurized compounding in the molten state is 190°C, and the pressure is 3KG.

Comparative example 1

In the synthetic leather provided in this example, the difference from Example 1 is that different TPU particles are used, and the TPU particles are B-50A, which is purchased from BASF.

Others are the same as in Example 1.

Comparative example 2

In the synthetic leather provided in this example, the difference from Example 1 is that different TPU particles are used, and the TPU particles are M-70, which are purchased from Meirui New Materials Company.

Others are the same as in Example 1.

Evaluation method

Performance tests were performed on the leathers prepared in Example 1 and Comparative Examples 1-2, and the test results are shown in Table 1.

Performance Testing:

1. PAHS environmental protection 24 items

2. Hydrolysis resistance: sodium hydroxide rapid detection method

3. Wear resistance: Martindale wear resistance testing method is adopted.

Table 1 shows the performance test results of the leather prepared in Example 1 and Comparative Examples 1 to 3

测试项目Test items	测试方法testing method	实施例1Example 1	对比例1Comparative example 1	对比例2Comparative example 2
PAHS环保24项PAHS environmental protection 24 items	To	通过by	不通过Fail	不通过Fail
耐水解Hydrolysis resistance	快速检测法Rapid detection method	5年5 years	5年5 years	5年5 years
耐磨性Abrasion resistance	马丁代尔Martindale	3万次无破损30,000 times without damage	破损damaged	破损damaged

The synthetic leather of the present invention selects suitable materials that do not contain 18 kinds of polycyclic aromatic hydrocarbons and similar substances, raw materials do not contain, no addition in the production process, and no addition in the packaging process, so as to make children feel safe to use synthetic leather for children’s products, such as children armrest.

The above-mentioned embodiments are only to illustrate the technical concept and characteristics of the present invention, and their purpose is to enable those familiar with the technology to understand the content of the present invention and implement them accordingly, and should not limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims

A synthetic leather for children's products, the synthetic leather comprising a base cloth layer, a PU bottom layer and a PU surface layer arranged in sequence, characterized in that: the base cloth layer and the PU bottom layer are attached to each other through a TPU adhesive layer, wherein The raw material of the TPU adhesive layer is composed of TPU particles and an auxiliary agent, and the auxiliary agent accounts for 0.05 to 0.5% of the total weight of the raw material of the TPU adhesive layer. The TPU particles are WHT-8170 from Wanhua Company. , The auxiliary agent is a leveling agent;

In parts by weight, the raw material formula of the PU surface layer includes the following components:

The first PU resin is Huafeng SK-50;

In parts by weight, the raw material formula of the PU bottom layer includes the following components:

The second PU resin is Hexin 9531.
The synthetic leather for children's products according to claim 1, characterized in that: the base cloth is 100D healthy cloth; the raw material of the TPU adhesive layer is composed of 100 parts of the TPU particles and 0.2 parts of leveling agent; The raw material of the PU surface layer is composed of 100 parts of the first PU resin, 80 parts of ethyl ester, 4 parts of colorant and 0.2 parts of leveling agent; the raw material of the PU bottom layer is composed of 100 parts of the second PU resin, 80 parts It is composed of 1 part ethyl ester, 4 parts color material and 0.2 part leveling agent;

The synthetic leather is prepared by the following preparation method:

(1) According to the formula, mix and stir uniformly the first PU resin, solvent, colorant and leveling agent to prepare a first mixed slurry, coat the first mixed slurry on the surface of the release paper, and dry , Forming a PU surface layer;

(2) According to the formula, mix and stir the second PU resin, solvent, colorant and leveling agent uniformly to prepare a second mixed slurry, and coat the second mixed slurry on the PU prepared in step (1) Dry the surface of the surface layer to form a PU bottom layer on the PU surface layer to obtain a PU dry film;

(3) According to the formula, mix the TPU particles and additives, melt extrusion coating on the surface of the PU bottom layer of the PU dry film prepared in step (2), and then press the composite base fabric in the molten state, cool, and then A TPU adhesive layer is formed between the cloth and the PU bottom layer, and the release paper is separated to obtain the synthetic leather finished product;

In step (3), the temperature of the pressurized compound in the molten state is 190±5°C, and the pressure is 3±0.5KG.
A synthetic leather for children's products, the synthetic leather comprising a base cloth layer, a PU bottom layer and a PU surface layer arranged in sequence, characterized in that: the base cloth layer and the PU bottom layer are attached to each other through a TPU adhesive layer, wherein The raw material of the TPU adhesive layer is composed of TPU particles and an auxiliary agent, and the auxiliary agent accounts for 0.05-0.5% of the total weight of the raw material of the TPU adhesive layer, and the TPU particles are WHT-8170.
The synthetic leather for children's products according to claim 1, wherein the auxiliary agent is a leveling agent.
The synthetic leather for children's products according to claim 1, wherein, in parts by weight, the raw material formula of the PU surface layer comprises the following components:

The first PU resin is SK-50.
The synthetic leather for children's products according to claim 5, wherein the solvent used in the PU surface layer is ethyl ester.
The synthetic leather for children's products according to claim 1, wherein, in parts by weight, the raw material formula of the PU bottom layer comprises the following components:

The second PU resin is 9531.
The synthetic leather for children's products according to claim 5, wherein the solvent used in the PU bottom layer is ethyl ester.
The synthetic leather for children's products according to claim 1, wherein the base fabric layer is 100D healthy cloth.
The synthetic leather for children's products according to claim 1, wherein the children's products include child seats and stroller armrests.
A method for preparing synthetic leather for children's products according to any one of claims 3 to 10, characterized in that the preparation method comprises the following steps:

(1) According to the formula, mix and stir the first PU resin, solvent, colorant and leveling agent uniformly to prepare a first mixed slurry, coat the first mixed slurry on the surface of the release paper, and dry , Forming a PU surface layer;

(2) According to the formula, mix and stir the second PU resin, solvent, colorant and leveling agent uniformly to prepare a second mixed slurry, and coat the second mixed slurry on the PU prepared in step (1) Dry the surface of the surface layer to form a PU bottom layer on the PU surface layer to obtain a PU dry film;

(3) According to the formula, mix the TPU particles and additives, melt extrusion coating on the surface of the PU bottom layer of the PU dry film prepared in step (2), and then press the composite base fabric in the molten state, cool, and then A TPU adhesive layer is formed between the cloth and the PU bottom layer, and the release paper is separated to obtain the synthetic leather finished product.
The method for preparing synthetic leather for children's products according to claim 11, characterized in that: in step (3), the temperature of the pressurized compound in the molten state is 190±5° C., and the pressure is 3±0.5 KG.