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Waterborne polyurethane resin and preparation method thereof and waterborne baking paint

A water-based polyurethane and resin technology, applied in the direction of climate sustainability, sustainable manufacturing/processing, chemical industry, etc., can solve the problems of partial film layer peeling off water resistance, poor water resistance, substandard, etc., to improve storage stability, Enhances water solubility and reduces flash rust problems

Active Publication Date: 2019-12-03
FOSHAN WANXIA NEW MATERIAL TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Further, taking water-based polyurethane as an example, since water-based polyurethane resin contains more carboxyl functional groups and hydroxyl functional groups, although this is a great boost for water-based polyurethane resin to obtain better water solubility, the existing water-based polyurethane resin is used as The paint raw materials are added to the paint, and the cured film layer obtained after coating is dried. Its water resistance is poor. After it is dried and solidified, it will cause blistering and partial film peeling off after being outdoors for a long time. The water resistance is not up to standard

Method used

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  • Waterborne polyurethane resin and preparation method thereof and waterborne baking paint
  • Waterborne polyurethane resin and preparation method thereof and waterborne baking paint
  • Waterborne polyurethane resin and preparation method thereof and waterborne baking paint

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preparation example Construction

[0039] see figure 1 , the preparation method of aqueous polyurethane resin in one embodiment, comprises the steps:

[0040] S110. Under the temperature condition of 25°C-30°C, mix 10-15 parts of polyhydric alcohol and 4.5-5 parts of alcohol ether ester solvent to obtain the first drop solution, and mix 15-20 parts of Mix isocyanate, 0.5 to 2 parts of vinylamide, 0.1 to 0.3 parts of catalyst and 3 to 5 parts of benzene solvent, heat up to 75°C to 85°C, and drop into the The first dropwise solution is kept for 4 hours to 6 hours for reaction to obtain the first intermediate base material.

[0041] When the above-mentioned water-based polyurethane resin is obtained by reacting isocyanate and polyol to obtain polyurethane, vinylamide is added together to participate in the reaction to form urethane groups and urea groups, especially the urea groups are non-hydrophilic groups. When the above-mentioned water-based polyurethane After the water-based baking varnish prepared with res...

Embodiment 1

[0058] Under the temperature condition of 28 ℃, the methyl propanediol of 60g and the neopentyl glycol of 75g and the propylene glycol methyl ether acetate of 45g are mixed, obtain the first dripping liquid, the toluene diisocyanate of 200g, the acrylamide of 3g, 8g of methacrylamide, 7g of methylolacrylamide, 2.5g of dibutyl dilaurate and 35g of trimethylbenzene were mixed, the temperature was raised to 85°C, and the first Add liquid dropwise, heat preservation reaction for 5 hours, obtain the first intermediate base material;

[0059] The temperature of the first intermediate base material was raised to 95°C, and 65g of methacrylic acid, 25g of butyl acrylate, 17g of isooctyl acrylate, 18g of ethyl acrylate, 16g of methyl acrylate, 12g of peroxide Benzoyl and 26g of trimethylbenzene were mixed to obtain the second dripping solution, which was dripped into the first intermediate base material, and kept for 3.5 hours to obtain the second intermediate base material. material; ...

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Abstract

The invention discloses a waterborne polyurethane resin. The waterborne polyurethane resin comprises the following components in parts by mass: 15-20 parts of an isocyanate; 10-15 parts of a polyol; 5-7 parts of an acrylic monomer; 6-8 parts of an acrylate monomer; 0.5-2 parts of a vinyl amide; 0.5-2 parts of an initiator; 0.1-0.3 part of a catalyst; 0.5-2 parts of a neutralizer; 10-13 parts of asolvent; and 40-46 parts of water. When the waterborne polyurethane resin is obtained by carrying out a reaction of the isocyanate and the polyol, the vinyl amide is added together to participate in the reaction to form a carbamate group and a urea group, especially the urea group is a non-hydrophilic group, and after a waterborne baking paint prepared by using the waterborne polyurethane resin asa raw material is attached to high-grade hardware, a cured film layer can have relatively good water resistance and hydrophobicity through the urea group, and the effect of non-foaming for two weeksof continuous immersion can be realized.

Description

technical field [0001] The invention relates to the technical field of water-based polyurethane resin modification, in particular to a water-based polyurethane resin, a preparation method thereof, and a water-based baking varnish. Background technique [0002] At present, the coating resins are mainly solvent-based resins, such as solvent-based alkyd resins, solvent-based epoxy resins and solvent-based polyurethane resins. [0003] As people's awareness of environmental protection is getting higher and higher, more and more water-based resins appear on the market, but there are still more or less problems. [0004] Further, taking water-based polyurethane as an example, since water-based polyurethane resin contains more carboxyl functional groups and hydroxyl functional groups, although this is a great boost for water-based polyurethane resin to obtain better water solubility, the existing water-based polyurethane resin is used as The paint raw materials are added to the pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/00C08F220/06C08F220/18C08F220/14C09D151/08C09D161/20C09D5/08
CPCC08F283/008C09D151/08C09D5/08C08F220/06C08F220/14C08L61/20Y02P20/10
Inventor 徐立新邵勇甘景洪苏理庆
Owner FOSHAN WANXIA NEW MATERIAL TECH CO LTD
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