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Waterproof, humidity permeable resin in aromatic for overcoating synthetic leather, manufactureing method of half-advanced polymerization

A waterproof, moisture-permeable, synthetic leather technology, applied in the semi-prepolymerized manufacturing of finishing resins and aromatic synthetic leather finishing resins, can solve the problems of poor waterproof performance and swelling, and achieve good waterproof performance, perfect response and product quality. stable effect

Inactive Publication Date: 2007-12-26
宜兴市新光化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The existing waterproof and moisture-permeable synthetic leather finishing resins on the market are oily polyurethane finishing resins obtained by reacting polyester diol with isocyanate, chain extenders and diluents. No grafting aids are added. The shortcoming is the product It will swell after contact with water, and the waterproof performance is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take 72 parts of PPG with a molecular weight of 2000, 8 parts of polydimethylsiloxane polyoxyethylene copolymer as a grafting aid, adjust the pH value to 4.6-5.1 with an appropriate amount of phosphoric acid, put in 20 parts of isocyanate MDI, and heat up to 75 React at ℃ for 1.5 hours, cool to 50-65℃, dilute with 25 parts of toluene, add 0.2 parts of organic bismuth catalyst and 2.5 parts of chain extender MEG to react until the viscosity reaches above 100,000 CP.S, and the chain extender is added in three times , followed by 2 parts, 0.3 parts, and 0.1 parts. After the chain extender is put into the chain extender for the second time, 40 parts of methyl ethyl ketone is added. parts, and then use 35 parts of solvent toluene to adjust the viscosity to 60,000-70,000 CP.S.

Embodiment 2

[0025] Put 10 parts of PPG50 and PEG with a molecular weight of 2000, 15 parts of polydimethylsiloxane polyoxyethylene copolymer as a grafting aid, adjust the pH value to 4.6-5.1 with an appropriate amount of phosphoric acid, add 25 parts of isocyanate MDI, and heat up React at 85°C for 1 hour, cool to 50-65°C, dilute with 30 parts of toluene, add 0.4 parts of catalyst dibutyltin dilaurate and 3.5 parts of chain extender 1,4 butanediol, and react until the viscosity reaches 100,000 CP. Above S, the chain extender is put in three times, which are 2.4 parts, 0.8 parts, and 0.3 parts in turn. After the chain extender is put in for the second time, 40 parts of acetone is added. After the chain extender is put in for the third time, ethyl acetate is added. 16 parts, and finally put in 0.2 parts of methanol as a termination reaction agent, and then use 74 parts of solvent toluene to adjust the viscosity to 60,000-70,000 CP.S.

Embodiment 3

[0027] Take 80 parts of PTMEG with a molecular weight of 2000, 5 parts of polydimethylsiloxane polyoxyethylene copolymer as a grafting aid, adjust the pH value to 4.6-5.1 with an appropriate amount of phosphoric acid, add 15 parts of isocyanate MDI, and heat up to 80 React at ℃ for 1.2 hours, cool to 50-65℃, dilute with 20 parts of toluene, add 0.5 parts of dibutyltin dilaurate as a catalyst and 3 parts of chain extender 1,4 butanediol, and react until the viscosity reaches more than 100,000 CP.S , wherein the chain extender is put into two times, followed by 2.4 parts and 0.8 parts. After each chain extender is put in, toluene is added for dilution. parts, and then use 45 parts of solvent toluene to adjust the viscosity to 60,000-70,000 CP.S.

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PUM

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Abstract

This invention relates to aliphatic waterproof moisture-permeable finishing resin for synthetic leather. The finishing resin is produced from polyester diol and isocyanate in the presence of catalyst and chain extender by graft polymerization (semi-prepolymerization method). Dimethyl siloxane-oxyethylene copolymer is added into the reaction. The molecular structure of the product can be effectively changed, and the product has such advantages as high waterproof ability, no swelling when contacting water, complete reaction and stable quality.

Description

technical field [0001] The invention relates to a synthetic leather finishing resin, in particular to an aromatic synthetic leather finishing resin with a waterproof and moisture-permeable function, and provides a semi-prepolymerization manufacturing method for the finishing resin. Background technique [0002] The existing waterproof and moisture-permeable synthetic leather finishing resins on the market are oily polyurethane finishing resins obtained by reacting polyester diol with isocyanate, chain extenders and diluents. No grafting aids are added. The shortcoming is the product It will swell after contact with water, and its waterproof performance is poor. Contents of the invention [0003] The present invention aims to overcome the above disadvantages and provide an aromatic waterproof and moisture-permeable synthetic leather finishing resin that has good waterproof performance and does not swell after contacting with water. Methylsiloxane polyoxyethylene copolymer ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04D06N3/14
Inventor 芮小平芮新平吴雄伟
Owner 宜兴市新光化工有限公司