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Method for preparing solvent-free multicomponent polyurethane synthetic leather based on steam injection coating

A technology of flow coating and polyurethane, applied in chemical instruments and methods, layered products, textiles and papermaking, etc., can solve the problems of poor physical and mechanical properties of coatings, DMF residue, difficult to control thickness, etc., to improve peel strength , The effect of improving physical and mechanical properties and improving adhesion

Inactive Publication Date: 2014-07-02
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

DMF is used as a solvent in the process, which will cause DMF pollution during the process
Second, water cannot completely replace DMF in polyurethane, which will lead to DMF residues in the product, which will eventually cause product safety problems, and this product safety problem will restrict products from entering the high-end market amidst numerous technical and trade barriers
First, using the existing solvent-free two-component polyurethane as a raw material, only foaming coatings can be prepared, and it is impossible to prepare a non-foaming coating; second, using the existing solvent-free two-component polyurethane as a raw material, due to Rapid foaming, large changes in the coating, difficult to control the thickness, using a single spray, the coating is uneven, using the method of scraping after spraying, due to rapid foaming, the viscosity of the mixture is high, it will stick to the scraper, resulting in coating Failed; third, using the existing solvent-free two-component polyurethane as raw material, direct reaction molding and curing, the formed polyurethane has poor molecular regularity, poor physical and mechanical properties of the coating, and it is difficult to produce products with higher physical and mechanical properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) First, in parts by mass, mix 20 parts of polyol polyether diol, 10 parts of isocyanate namely toluene diisocyanate, 8 parts of chain extender ethylene glycol, and 3 parts of vulcanizing agent 4,4'-diaminodiphenyl methyl methane, 0.05 parts of catalyst stannous octoate, 3 parts of foaming agent water, 3 parts of foam stabilizer polyether modified silicone surfactant, 5 parts of inorganic pigment or organic pigment colorant with a particle size above 800 mesh, 3 parts of powdered calcium oxide that absorbs carbon dioxide and water and 8 parts of filler light calcium carbonate with a particle size above 400 mesh are added to several raw material tanks of the polyurethane casting machine;

[0028] 2) Secondly, by adjusting the quantitative pump on the raw material tank, the raw materials are transported to the mixing head of the pouring machine for mixing to obtain a mixed slurry;

[0029] 3) Then, pass the mixed slurry through a screw-type injection flow coater, and the...

Embodiment 2

[0032] 1) First, in terms of parts by mass, 50 parts of polyol polyether triol, 30 parts of isocyanate liquefied diphenylmethylene diisocyanate, 12 parts of chain extender 1,4-butanediol, and 5 parts of vulcanized Agent di-o-chlorodiphenylamine methane, 3 parts of catalyst dibutyltin dilaurate, 1 part of coupling agent organosilicon coupling agent KH-550, 10 parts of inorganic pigment or organic pigment colorant with a particle size above 800 mesh, 5 parts The powdered calcium oxide that absorbs carbon dioxide and water and 15 parts of filler wood powder with a particle size of more than 400 mesh are added to several raw material tanks of the polyurethane casting machine;

[0033] 2) Secondly, by adjusting the quantitative pump on the raw material tank, the raw materials are transported to the mixing head of the pouring machine for mixing to obtain a mixed slurry;

[0034] 3) Then, pass the mixed slurry through a screw-type injection flow coater, and the coating method is slit c...

Embodiment 3

[0037] 1) First, in terms of parts by mass, 70 parts of polyols are heated and liquefied polyester diol, 40 parts of isocyanate isophorone diisocyanate, 25 parts of chain extender ethylenediamine, and 10 parts of vulcanizing agent 4,4 '-Methylene dianiline, 4 parts of catalyst dimethylethanolamine, 3 parts of coupling agent silicone coupling agent A-1100, 5 parts of foaming agent dichloromethane, 7 parts of foam stabilizer polyether modified silicone Surfactants, 8 parts of inorganic pigments or organic pigment colorants with a particle size above 800 mesh and 7 parts of powdered calcium oxide that absorbs carbon dioxide and water are added to several raw material tanks of the polyurethane casting machine;

[0038] 2) Secondly, by adjusting the quantitative pump on the raw material tank, the raw materials are transported to the mixing head of the pouring machine for mixing to obtain a mixed slurry;

[0039] 3) Then, pass the mixed slurry through a screw-type injection flow coa...

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Abstract

The invention discloses a method for preparing solvent-free multicomponent polyurethane synthetic leather based on steam injection coating. The method comprises the following steps: firstly, adding polyhydric alcohol, isocyanate, chain extender, vulcanizing agent, catalyst, coupling agent, foaming agent, foam stabilizer, colorant, component absorbing carbon dioxide and water and filler into a plurality of stock tanks of a polyurethane casting machine; secondly, conveying the raw materials to a mixing head of the casting machine for mixing by regulating a metering pump on the raw material tank to obtain mixed size; coating the mixed size on release paper by a steam injection spreader, fitting base cloth on the mixed size layer of the release paper and then drying the base cloth; and finally, continuously reacting the mixed size by post curing till complete curing, and peeling the release paper after cooling to obtain the solvent-free multicomponent polyurethane synthetic leather. No solvent is used in the production process, so that the environmental pollution problem of DMF, TOL, MEK, THF and other solvents generated by the existing solvent polyurethane synthetic leather can be solved.

Description

technical field [0001] The invention belongs to the technical field of polyurethane synthetic leather, and in particular relates to a method for preparing solvent-free multi-component polyurethane synthetic leather based on flow coating. Background technique [0002] Polyurethane 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 data of the National Bureau of Statistics, in 2011, there were 495 artificial leather and synthetic leather enterprises above design...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06N3/12B32B37/02B32B37/26C08G18/76C08G18/66C08G18/48C08G18/42C08G18/10C08G101/00
Inventor 马兴元吴泽胡雪丽
Owner SHAANXI UNIV OF SCI & TECH
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