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Environment-friendly EVA synthetic leather subjected to surface graft treatment and preparation method thereof

A surface grafting, environment-friendly technology, applied in the field of synthetic leather, can solve the problems of incompatibility, low adhesion strength, surface peeling, etc., and achieve the effects of good physical properties, elimination of organic pollution, and high bonding strength

Pending Publication Date: 2020-08-28
SHANGHAI HIUV APLLIED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Due to the incompatibility of polyurethane and EVA in terms of structure and composition, if polyurethane is directly coated on the surface of EVA film, its adhesion strength is low, and it is relatively easy to fall off from the surface, and the physical properties of the film formed on the surface cannot reach the actual leather. The general requirements for use, so it is necessary to modify the surface of the EVA film in order to produce a bonding effect, so that the subsequent coating can produce sufficient adhesion strength on the surface, and form a guarantee basis for the improvement of the final physical properties. However, the current relevant reports haven't found yet

Method used

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  • Environment-friendly EVA synthetic leather subjected to surface graft treatment and preparation method thereof
  • Environment-friendly EVA synthetic leather subjected to surface graft treatment and preparation method thereof
  • Environment-friendly EVA synthetic leather subjected to surface graft treatment and preparation method thereof

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Effect test

Embodiment 1

[0038] In the present embodiment, the surface graft treatment agent includes the following raw materials in terms of weight percentage:

[0039]

[0040] Wherein the isocyanate content of the polyurethane prepolymer is 14.5%, and the hydroxyl value of the curing agent is 80mgKOH / g;

[0041] The conventional formula of surface layer polyurethane slurry includes the following raw materials in terms of weight percentage:

[0042] Solvent-free polyurethane prepolymer: 60.0wt%

[0043] Curing agent: 39.9wt%

[0044] Catalyst: 0.1wt%

[0045] Wherein the isocyanate content of the polyurethane prepolymer is 2.3%, and the hydroxyl value of the curing agent is 40mgKOH / g;

[0046] The preparation of environment-friendly type through surface grafting treatment EVA synthetic leather comprises the following steps:

[0047] 1) prepare the relevant raw materials of EVA layer, wherein the content of EVA is 50wt%;

[0048] 2) After fully mixing the raw materials, add them into an extru...

Embodiment 2

[0053] In the present embodiment, the surface graft treatment agent includes the following raw materials in terms of weight percentage:

[0054]

[0055] Wherein the isocyanate content of the polyurethane prepolymer is 15.0%, and the hydroxyl value of the curing agent is 210mgKOH / g;

[0056] The preparation of environment-friendly type through surface grafting treatment EVA synthetic leather comprises the following steps:

[0057] 1) prepare the relevant raw materials of EVA layer, wherein the content of EVA is 60wt%;

[0058] 2) After fully mixing the raw materials, add them into an extruder, extrude them into a film, cast them on the base cloth, flatten them and wind them up;

[0059] 3) Carry out radiation crosslinking, the crosslinking degree of EVA layer is 72%, obtains environment-friendly EVA synthetic leather Base;

[0060] 4) Pre-treat a layer of environmentally friendly surface graft treatment agent on the surface of the environmentally friendly EVA synthetic le...

Embodiment 3

[0063] In the present embodiment, the surface graft treatment agent includes the following raw materials in terms of weight percentage:

[0064]

[0065] Wherein the isocyanate content of the polyurethane prepolymer is 10.5%, and the hydroxyl value of the curing agent is 400mgKOH / g;

[0066] The preparation of environment-friendly type through surface grafting treatment EVA synthetic leather comprises the following steps:

[0067] 1) prepare the relevant raw materials of EVA layer, wherein the content of EVA is 78wt%;

[0068] 2) After fully mixing the raw materials, add them into an extruder, extrude them into a film, cast them on the base cloth, flatten them and wind them up;

[0069] 3) Carry out radiation cross-linking, the cross-linking degree of EVA layer is 90%, obtains environment-friendly EVA synthetic leather Base;

[0070] 4) Pre-treat a layer of environmentally friendly surface graft treatment agent on the surface of the environmentally friendly EVA synthetic ...

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Abstract

The invention discloses environment-friendly EVA synthetic leather subjected to surface grafting treatment. The environment-friendly EVA synthetic leather sequentially comprises base cloth, an ethylene vinyl acetate copolymer (EVA) layer, a surface grafting treatment layer and a polyurethane lay from bottom to top. The invention also provides a corresponding preparation method of the environment-friendly EVA synthetic leather. The preparation method comprises the steps that firstly, raw materials of resin with EVA as a main body are cast onto the base cloth, and subjected to radiation crosslinking to obtain an environment-friendly EVA synthetic leather Base; secondly, an environment-friendly surface grafting treatment agent is applied to the surface of the Base for treatment; and finally,the surface of the grafting treatment layer is coated with polyurethane slurry, and after drying and curing, the environment-friendly EVA synthetic leather with high bonding strength, good wear resistance and scratch resistance and other physical properties can be prepared. According to the synthetic leather produced by the preparation method of the invention, harmful chemicals such as organic solvents which are not friendly to the environment are not used in production processes of EVA raw material film casting, surface grafting treatment, polyurethane coating and the like, and organic pollution is eliminated from the source.

Description

technical field [0001] The invention relates to the technical field of synthetic leather, in particular to an environment-friendly EVA synthetic leather treated with surface grafting and a corresponding preparation method. Background technique [0002] In the past 30 years, with the transfer of furniture, shoemaking, clothing and other industries to my country, the domestic synthetic leather industry has achieved rapid growth, making my country the world's largest producer and exporter of synthetic leather, with about 70% of production capacity concentrated in our country. From 2000 to 2014, domestic synthetic leather production increased rapidly from 410,000 tons to 3.75 million tons, with a compound annual growth rate of 17.1%. Although it declined due to the global economic slowdown from 2015 to 2016, it was still at a historically high level. The global economy has gradually recovered, and the synthetic leather industry has re-entered the rising channel. [0003] At pre...

Claims

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Application Information

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IPC IPC(8): D06N3/00D06N3/14D06N3/04
CPCD06N3/00D06N3/14D06N3/04D06N2209/1664D06N2209/1685D06N2211/28
Inventor 李民蔡相成李庆北
Owner SHANGHAI HIUV APLLIED MATERIALS CO LTD
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