Modified polypropylene carbonate based polyurethane water-based coating agent applied to leather and preparation method of water-based coating agent

A polypropylene carbonate-based polyurethane and polypropylene carbonate technology, applied in the field of leather finishing agent polymer materials, can solve the problems of enhancing the adhesion of the bottom layer, accelerating the speed of film formation, and poor adhesion of the bottom layer, achieving Enhance the adhesion, accelerate the speed of film formation, and have good adhesion

Active Publication Date: 2015-01-14
HUIZHOU DAYAWAN DAZHI FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at problems such as poor cohesive force and general stability of the bottom layer of the coating agent in the prior art, and the manufacturing process is harmful to the human body. Polypropylene carbonate-based polyurethane is used as the initial raw material and modified with epoxy resin. Effectively enhance the adhesion to the bottom layer and accelerate the film forming speed; use isophorone diamine as a chain extender to further improve the stability of the coating agent

Method used

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  • Modified polypropylene carbonate based polyurethane water-based coating agent applied to leather and preparation method of water-based coating agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 100 parts of polypropylene carbonate polyols with a molecular weight of 1000 according to the mass fraction, dehydrate first, then add 60 parts of hexamethylene diisocyanate and 0.05 parts of organotin catalyst, heat up to 50°C, react for 5 hours, and cool down to At 40°C, add 6 parts of dimethylol propionic acid, raise the temperature to 50°C, react for 5 hours, cool down to 40°C, add 1 part of epoxy resin of model E-44, react at 80°C for 0.1h, and cool down to 0 ℃, add 0.5 parts of triethylamine and 0.5 parts of acetone, stir evenly, then add 1 part of chain extender isophorone diamine, then add deionized water to adjust the solid content to 30%, and emulsify at 0 ℃ for 0.1h , remove acetone under reduced pressure to obtain the modified polypropylene carbonate-based polyurethane water-based finishing agent for leather of the present invention.

Embodiment 2

[0027] Weigh 100 parts of polypropylene carbonate polyol with a molecular weight of 2000 according to the mass fraction, dehydrate first, then add 40 parts of toluene diisocyanate and 0.1 part of dibutyltin dilaurate, heat up to 85°C, react for 1 hour, and cool down to 40°C , add 12 parts of dimethylol butyric acid half ester, heat up to 70°C, react for 1h, cool down to 40°C, add 5 parts of epoxy resin with model E-51, react at 80°C for 0.1h, cool down to 5°C, add 8 parts of dimethylcyclohexylamine and 20 parts of acetone, stir evenly, then add 3 parts of chain extender isophorone diamine, then add deionized water to adjust the solid content to 30%, at 0°C The emulsification reaction was carried out for 2 hours, and the acetone was removed under reduced pressure to obtain the modified polypropylene carbonate-based polyurethane water-based finishing agent for leather of the present invention.

Embodiment 3

[0029] Weigh 100 parts of polypropylene carbonate polyol with a molecular weight of 1500 according to the mass fraction, first dehydrate, then add 65 parts of 4,4'-diphenylmethane diisocyanate and 1 part of dibutyltin dilaurate, and heat up to 80°C , react for 1 hour, cool down to 40°C, add 16 parts of dimethylol propionic acid, heat up to 70°C, react for 2 hours, cool down to 40°C, add 15 parts of E-20 epoxy resin, and react at 70°C 2h, cool down to 10°C, add 18 parts of tripropylamine, 40 parts of acetone, stir evenly, then add 4 parts of chain extender isophorone diamine, then add deionized water to adjust the solid content to 30%, at 5°C After the emulsification reaction for 0.5 h, the acetone was removed under reduced pressure to obtain the modified polypropylene carbonate-based polyurethane water-based finishing agent for leather of the present invention.

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Abstract

The invention relates to the technical field of high polymer materials of leather coating agents and provides a modified polypropylene carbonate based polyurethane water-based coating agent applied to leather and a preparation method of the water-based coating agent. The modified polypropylene carbonate based polyurethane water-based coating agent applied to the leather comprises the following components in parts by mass: 100 parts of polypropylene carbonate polyhydric alcohol, 35-65 parts of diisocyanate, 0.05-5 parts of an organic tin catalyst, 5-20 parts of a hydrophilic chain extender, 1-15 parts of epoxy resin, 0.5-50 parts of a neutralizer and 1-5 parts of a chain extender, wherein the epoxy resin is selected from one or more of E-44 epoxy resin, E-51 epoxy resin and E-20 epoxy resin; the chain extender is isophorone diamine. The coating agent is prepared by copolymerization reaction of the polypropylene carbonate polyhydric alcohol, the diisocyanate and the epoxy resin. The coating agent prepared by the method has the characteristics of being high in underlying adhesive property, excellent in stability, low in cost, green and environment-friendly.

Description

technical field [0001] The invention relates to the technical field of leather finishing agent polymer materials, in particular to a modified polypropylene carbonate-based polyurethane water-based finishing agent for leather and a preparation method thereof. Background technique [0002] Leather finishing agent is a general term for a class of leather auxiliaries used to protect and beautify leather on the surface of leather. The surface of the leather treated with the finishing agent can form a film protective layer, which can cover the defects of the leather and improve the grade of the leather, endowing the synthetic leather with a beautiful appearance, a comfortable feel and good mechanical and physical properties. [0003] In the tanning industry, commonly used leather finishes include acrylate finishes, casein finishes, nitrocellulose finishes and water-based polyurethane finishes. Among them, the water-based polyurethane finishing agent uses water as the solvent, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M15/572C08G18/58C08G18/44C08G18/32C08G18/34C14C11/00
Inventor 陈伟彬蔡志华牛艳丽
Owner HUIZHOU DAYAWAN DAZHI FINE CHEM
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