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A Clean Production Process of Polyurethane Synthetic Leather Based on Continuous Flow Coating Method

A clean production and synthetic leather technology, applied in the field of synthetic leather, can solve problems such as environmental pollution, human hazards, threats, etc., and achieve the effect of simple process operation and stable process

Inactive Publication Date: 2017-10-13
洛阳硕佳新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These organic solvents are extremely volatile during the production process, seriously polluting the environment and posing a threat to the health of on-site operators
[0004] According to the above-mentioned traditional solvent-based production process, there is a serious environmental pollution problem in the production process, which is a non-clean production process
DMF residues are prone to occur in the obtained polyurethane synthetic leather, which is harmful to the human body

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Set the conveying speed to 10m / min, the base material is released from the unwinder, and the back cover slurry is sprayed on the base material through the first flow coating machine to form a back cover coating, and the application amount is 50g / m 2 , and then enter the oven and dry at 110°C to obtain a back cover substrate; wherein, the base material is a woven cloth, and the back cover slurry is obtained by the following method: in parts by weight, 80 parts of vinyl acetate-ethylene copolymerized The emulsion (referred to as VAE emulsion) and 2 parts of polyphenyl polymethylene polyisocyanate (abbreviated as PAPI, or called crude MDI) were evenly mixed to obtain the back cover slurry.

[0026] 2) The base material of the back cover passes through the second flow coating machine, and the foaming slurry is sprayed on the back cover coating to form a foam coating, and the application amount is 170g / m 2 , and then enter the oven, react and foam under the condition of 1...

Embodiment 2

[0030] 1) Set the conveying speed to 5m / min, the base material is released from the unwinding machine, and the back cover slurry is sprayed on the base material through the first flow coating machine to form a back cover coating, and the application amount is 120g / m 2 , and then enter the oven and dry at 120°C to obtain the back cover substrate; wherein, the base material is a non-woven fabric, and the back cover slurry is prepared by the following method: in parts by weight, 90 parts of vinyl acetate-ethylene copolymerization The emulsion (referred to as VAE emulsion) and 3 parts of polyphenyl polymethylene polyisocyanate (abbreviated as PAPI, or crude MDI) were evenly mixed to obtain the back cover slurry.

[0031] 2) The base material of the back cover passes through the second flow coating machine, and the foaming slurry is sprayed on the back cover coating to form a foam coating, and the application amount is 200g / m 2 , and then enter the oven, react and foam under the co...

Embodiment 3

[0035] 1) Set the conveying speed to 15m / min, the base material is released from the unwinder, and the back cover slurry is sprayed on the base material through the first flow coating machine to form a back cover coating, and the application amount is 70g / m 2 , and then enter the oven and dry at 100°C to obtain the back cover base material; wherein the base material is a superfine fiber synthetic leather base cloth, and the back cover slurry is prepared by the following method: in parts by weight, 82 parts of acetic acid Ethylene-ethylene copolymer emulsion (abbreviated as VAE emulsion) and 4 parts of polyphenylpolymethylene polyisocyanate (abbreviated as PAPI, or called crude MDI) were uniformly mixed to obtain back cover slurry.

[0036] 2) The base material of the back cover passes through the second flow coating machine, and the foaming slurry is sprayed on the back cover coating to form a foam coating, and the application amount is 150g / m 2 , and then enter the oven, reac...

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PUM

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Abstract

Provided is a polyurethane synthetic leather clean production process based on a continuous curtain coating method. A base material is discharged out by an unreeling machine, and passes through a first curtain coating machine to be curtain-coated with bottom sealing slurry, and a bottom sealing base material is obtained after drying. The bottom sealing base material passes through a second curtain coating machine, a bottom sealing coating is curtain-coated with foaming slurry, and a foamed base material is obtained after curing. The foamed base material passes through a third curtain-coating machine, a foamed layer is curtain-coated with surface layer slurry, and semi-finished polyurethane synthetic leather is obtained after drying. The semi-finished polyurethane synthetic leather is subjected to a conventional after treatment procedure, and finished polyurethane synthetic leather can be obtained. In the process, no organic solvent is used, and no solvent pollution exists. The process is easy to operate and stable. The content of any solvent in the finished polyurethane synthetic leather is lower than 3 ppm.

Description

technical field [0001] The invention belongs to the technical field of synthetic leather, relates to a production method of synthetic leather, in particular to a clean production process of polyurethane synthetic leather based on a continuous flow coating method. Background technique [0002] Synthetic leather is a composite material that simulates the structure and performance of natural leather and can be used as a substitute for natural leather. Usually non-woven fabric is used to simulate the mesh layer, and microporous polyurethane coating is used to simulate the grain layer. The front and back of the obtained synthetic leather are very similar to leather, and have a certain degree of air permeability, which is closer to natural leather than ordinary artificial leather. Widely used in making shoes, boots, bags and ball games. In 2014, the domestic consumption of synthetic leather was about 4.55 billion square meters, and its total production ranked first in the world. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06N3/00D06N3/04D06N3/14D06N3/18
CPCD06N3/0043D06N3/045D06N3/14D06N3/146D06N3/147D06N3/183D06N2211/28
Inventor 马兴元丁博刘帅胡文杰张铭芮田志文李梦函
Owner 洛阳硕佳新材料科技有限公司