Preparation method for sealing type solvent-free polyurethane for synthetic leather and application

A solvent-free polyurethane, closed-type technology, used in polyurea/polyurethane adhesives, adhesive types, film/flake adhesives, etc., to solve problems such as DMF residues, product safety issues, solvent contamination, etc. , to achieve the effect of stable production process, elimination of solvent pollution and mild preparation conditions

Active Publication Date: 2018-03-06
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the production of polyurethane synthetic leather adopts solvent-based polyurethane. A large amount of solvents, such as dimethylformamide, toluene and butanone, are used in the manufacture and use of polyurethane, which will cause solvent pollution during the process.
Moreover, it will cause the DMF residue problem of the product, which will eventually cause product safety problems
And this kind of product safety problem will restrict the product from entering the high-end market

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0018] A method for preparing a closed solvent-free polyurethane for synthetic leather. In terms of molar parts, firstly, 100-150 parts of diol after vacuum dehydration, 10-20 parts of methyl ethyl ketone oxime, 10-20 parts of acetylacetone, acrylic acid Add 10-20 parts of diethyl diacid into the reactor with nitrogen protection, and mix well. Then, add 130 to 210 parts of diisocyanate, stir and mix evenly, react at 70 to 90°C for 60 to 120 minutes, and after cooling, the closed solvent-free polyurethane for synthetic leather can be obtained.

[0019] The diols employed are polyether diols or polyester diols. It can also be a diol or a mixture of diols.

[0020] The diisocyanate component employed is a liquid isocyanate having two -N=C=O functional groups. Such as toluene diisocyanate (TDI), diphenylmethylene diisocyanate (MDI), isophorone diisocyanate (IPDI) and so on. It can also be a diisocyanate or a mixture of diisocyanates.

[0021] The application method of the clos...

Embodiment 1

[0027] A method for preparing a closed solvent-free polyurethane for synthetic leather. In terms of molar parts, first, 100 parts of diol after vacuum dehydration, 15 parts of methyl ethyl ketone oxime, 20 parts of acetylacetone and 10 parts of diethyl malonate Add 210 parts of diisocyanate into the reactor with nitrogen protection, mix evenly, then add 210 parts of diisocyanate, stir and mix evenly, react at 70°C for 120min, and after cooling, the sealed solvent-free polyurethane for synthetic leather can be obtained.

[0028] Among them, the diol is polyether diol.

[0029] The diisocyanate is toluene diisocyanate.

[0030] The application of the closed solvent-free polyurethane for synthetic leather prepared by the above method in the preparation of the surface layer: in parts by mass, mix 100-120 parts of the closed solvent-free polyurethane and 1-5 parts of the color paste evenly, and use scraper coating method, coated on the release paper, control the coating amount to ...

Embodiment 2

[0032] A method for preparing a closed solvent-free polyurethane for synthetic leather. In terms of molar parts, firstly, 120 parts of glycol after vacuum dehydration, 20 parts of methyl ethyl ketone oxime, 10 parts of acetylacetone and 15 parts of diethyl malonate Add one part into a reactor with nitrogen protection, mix well, then add 130 parts of diisocyanate, stir and mix well, react at 80°C for 80min, and after cooling, you can get a closed solvent-free polyurethane for synthetic leather.

[0033] Among them, the diol is polyester diol.

[0034] The diisocyanate is diphenylmethylene diisocyanate.

[0035] The application of the closed solvent-free polyurethane for synthetic leather prepared by the above method in the preparation of the foam layer: in parts by mass, 100-120 parts of the closed solvent-free polyurethane, 1-5 parts of color paste, foaming agent OBSH Mix 1~2 parts evenly, apply on the surface layer by scraping method, control the coating amount to 180~240g / m...

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Abstract

The invention discloses a preparation method for sealing type solvent-free polyurethane for synthetic leather and application. The preparation method comprises the following steps: firstly, uniformlymixing 100-150 parts of dihydric alcohol, 10-20 parts of methyl ethyl ketone oxime, 10-20 parts of acetylacetone and 10-20 parts of diethyl malonate after vacuum dehydration, further adding 130-210 parts of diisocyanate, uniformly stirring and mixing, performing reaction for 60-120 minutes at 70-90 DEG C, and cooling, thereby obtaining the sealing type solvent-free polyurethane. By adopting a preparation technique of synchronous polymerization sealing of multiple sealing agents, the sealing type solvent-free polyurethane of which the viscosity is smaller than 5000mPa/s can be prepared, preparation conditions are mild, and clean and environment-friendly effects are achieved, a production process is simple and stable when synthetic leather is produced from the sealing type solvent-free polyurethane, solvent pollution in conventional synthetic leather production process is eliminated, and meanwhile, the preparation method has the characteristics of energy conservation and high efficiency.

Description

technical field [0001] The invention relates to the technical field of polyurethane synthetic leather, in particular to a preparation method and application of a closed solvent-free polyurethane for synthetic leather. 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 foamed 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] At present, solvent-based polyurethane is used in the production of polyurethane synthetic leather. A large amount of solvents, such as dimethylformamide, toluene and methyl ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/42C08G18/48C08G18/75C08G18/76C09J175/06C09J175/08C08J9/10C09J7/25C09J7/29C09J7/30
CPCC08G18/4018C08G18/42C08G18/4825C08G18/724C08G18/755C08G18/7614C08G18/7671C08J9/104C08J2203/04C08J2375/06C08J2375/08C09J175/06C09J175/08C09J2301/122C09J2301/312C09J2475/00C09J2475/006
Inventor 马兴元刘帅张铭芮赵昭丁博
Owner SHAANXI UNIV OF SCI & TECH
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