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Polyurethane synthetic leather cleaning production process based on release paper transfer coating method

A transfer coating, clean production technology, applied in the direction of synthetic resin layered products, polyurea/polyurethane coatings, coatings, etc., can solve the problems of lack of production conditions, inability to continuous production, sticking to knives, etc., to eliminate solvents Pollution problems, significant economic benefits

Active Publication Date: 2012-10-31
HENAN YONGHE PLASTIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are three main problems at present: one is that this technology can only be used for the bottom layer of foaming, and it is still impossible to realize the dry transfer film of the top layer, so it is impossible to use this system alone to produce solvent-free synthetic leather; Solvent-free two-component polyurethane foam material, the reaction time of the two components is difficult to control when used, prone to nozzle clogging and knife sticking, the entire system has high requirements on the performance of the equipment, and currently does not meet the industrial production conditions; Third, the current existing technology is difficult to meet the requirements of machine stripping, and cannot be continuously produced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1) Prepare the top layer of water-based polyurethane coating

[0037]First, mix 60 parts of water-based polyurethane with a solid content of 30%, 2 parts of hydroxyl-containing acrylic resin leveling agent, and 1 part of aliphatic epoxy resin water-based polyurethane crosslinking agent in parts by mass to obtain a top coat;

[0038] Then, use the dry production line in the production process of synthetic leather to scrape the top coating on the release paper to form a uniform thickness coating. The transmission speed of the production line is 15m / min, and the application amount is 50g / m 2 ;

[0039] Finally, enter the drying tunnel and dry at 80°C to obtain a release paper with a top layer of water-based polyurethane coating;

[0040] 2) Prepare the bottom solvent-free two-component polyurethane foam coating

[0041] First, 80 parts of solvent-free polyurethane component A and 50 parts of solvent-free polyurethane component B are transported to the mixer through the f...

Embodiment 2

[0049] 1) Prepare the top layer of water-based polyurethane coating

[0050] First, mix 80 parts of water-based polyurethane with a solid content of 30%, 2 parts of polyurethane thickener, 1 part of hydroxyl-containing acrylic resin leveling agent, and 3 parts of polyisocyanate water-based polyurethane crosslinking agent in parts by mass top coat;

[0051] Then, use the dry production line in the production process of synthetic leather to scrape the top coating on the release paper to form a uniform thickness coating. The transmission speed of the production line is 20m / min, and the application amount is 100g / m 2 ;

[0052] Finally, enter the drying tunnel and dry at 90°C to obtain a release paper with a top layer of water-based polyurethane coating;

[0053] 2) Prepare the bottom solvent-free two-component polyurethane foam coating

[0054] First, 60 parts of solvent-free polyurethane component A and 20 parts of solvent-free polyurethane component B are transported to the ...

Embodiment 3

[0062] 1) Prepare the top layer of water-based polyurethane coating

[0063] First, 70 parts of water-based polyurethane with a solid content of 30%, 5 parts of polyurethane thickener, and 5 parts of aliphatic epoxy resin water-based polyurethane crosslinking agent are mixed uniformly to obtain a top coat in parts by mass;

[0064] Then, use the dry production line in the production process of synthetic leather to scrape the top coating on the release paper to form a uniform thickness coating. The transmission speed of the production line is 18m / min, and the application amount is 80g / m 2 ;

[0065] Finally, enter the drying tunnel and dry at 100°C to obtain a release paper with a top layer of water-based polyurethane coating;

[0066] 2) Prepare the bottom solvent-free two-component polyurethane foam coating

[0067] First, 50 parts of solvent-free polyurethane component A and 40 parts of solvent-free polyurethane component B are transported to the mixer through the feed pum...

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Abstract

The invention provides a polyurethane synthetic leather cleaning production process based on a release paper transfer coating method. The process comprises the steps of firstly scrapping a top layer coating on a release paper; and then treating the release paper with a waterborne polyurethane coating at the top layer through dry-type production line which is provided with a multi-spraying head material supplying system and a multi-cutter scraping machine, coating the double-component solvent-free polyurethane on the upper face of the waterborne polyurethane coating through the multi-spraying head material supplying system; and finally jointly adhering the release paper with the solvent-free double-component polyurethane intumescent coating and a nonwoven fabric or a knitted fabric, and preparing into semi-finished product by pre-ageing in a parching channel, and then transferring the semi-finished product into a multi-layer folding ageing box for ageing, and finally separating the synthetic leather from the release paper so as to obtain the environment-friendly polyurethane synthetic leather. The polyurethane synthetic leather produced by the production process provided by the invention has a three-layer structure in which the surface is the waterborne polyurethane coating, the middle is the solvent-free double-component polyurethane intumescent coating, and the lower face is the nonwoven fabric or the knitted fabric.

Description

technical field [0001] The invention relates to a production method of synthetic leather, in particular to a clean production process of polyurethane synthetic leather based on a release paper transfer 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. [0003] According to the statistics of the National Bureau of Statistics on the output of 316 artificial leather and synthetic leather enterprises above designated size, the total output of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06N3/14B32B27/12B32B27/18B32B27/40B32B37/26C09D175/04C09D175/06C09D175/08C09D175/12C09D7/12
Inventor 刘宝马兴元
Owner HENAN YONGHE PLASTIC
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