Water-based paint

A water-based coating and water-based polyurethane technology, which is applied in the field of decoration and coating, can solve the problems of difficult to effectively improve coating performance and poor compatibility.

Active Publication Date: 2015-02-25
ANHUI JINDUN PAINT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve the water resistance of the coating, technicians use aromatic and lipid small molecule crosslinking agents containing aziridine groups to cure polyurethane with carboxyl groups, but these small molecule crosslinking agents are not easy to disperse in water and are not compatible with polyurethane The compatibility of the components is poor, making it difficult to effectively improve the performance of the coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1 Embodiment 1

[0076] First, add a certain amount of PEG200, DMPA and butanone into a three-necked flask equipped with a spherical condenser and mechanical stirring, control the mass of butanone to be less than 10% of the reaction system, and stir at 50°C until DMPA is completely dispersed in PEG200 and butanone , and then add an appropriate amount of catalyst dibutyltin dilaurate and TDI, raise the temperature to 80 ° C for 2 hours, and finally add glycolic acid and continue the reaction for 0.5 hours. After cooling down to room temperature, a certain amount of ammonia water was added to deionized water, and slowly added dropwise to the system with a constant pressure funnel, and the pH value of the system was adjusted to 8 to prepare water-based polyurethane. The molar ratio of TDI, PEG, DMPA and GA is 7:5:1:2, and the carboxyl content of the prepared anionic waterborne polyurethane is 5.4wt%.

Embodiment 2

[0078]First, add a certain amount of PEG200, DMPA and butanone into a three-necked flask equipped with a spherical condenser and mechanical stirring, control the mass of butanone to be less than 10% of the reaction system, and stir at 50°C until DMPA is completely dispersed in PEG200 and butanone , and then add an appropriate amount of catalyst dibutyltin dilaurate and TDI, raise the temperature to 80 ° C for 2 hours, and finally add glycolic acid and continue the reaction for 0.5 hours. After cooling down to room temperature, a certain amount of ammonia water was added to deionized water, and slowly added dropwise to the system with a constant pressure funnel, and the pH value of the system was adjusted to 8 to prepare water-based polyurethane. The molar ratio of TDI, PEG, DMPA and GA is 6:4:1:2, and the carboxyl content of the prepared anionic waterborne polyurethane is 6.4wt%.

Embodiment 3

[0080] Add PEG1000 into a three-necked flask with a spherical condenser and mechanical stirring, heat and melt in a water bath at 50°C, and then add dibutylene dilaurate. After stirring evenly, add TDI, raise the temperature to 80°C, react for 1.5 hours, add butanone solution dissolved in AEO to continue the reaction for 1.5 hours, and discharge to obtain an aziridine-terminated polyurethane crosslinking agent.

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Abstract

The invention discloses a water-based paint composition, which contains (A) carboxyl-containing anionic waterborne polyurethane, (B) a polyurethane cross-linking agent and (C) guar gum. According to the water-based paint composition, the carboxyl-containing anionic waterborne polyurethane serving as film-forming resin and the polyurethane cross-linking agent which is subjected to end capping by aziridinyl and serves as a curing agent are subjected to curing reaction at room temperature, so that a coating of the water-based paint composition is high in compatibility and water resistance. According to the water-based paint composition, the guar gum (C) which has biodegradability and is from biomass is used, so that loads on environment can be relieved substantially from the consideration of viewpoints of petroleum removal, the reduction of carbon dioxide and the like. More important, the guar gum is used as a thickening agent, so that the water resistance of the water-based paint is improved, and the cost of the water-based paint is reduced greatly.

Description

technical field [0001] The invention relates to a water-based paint, which belongs to the technical field of decoration painting. Background technique [0002] In recent years, from the viewpoint of environmental problems, the transition from organic solvent-based paints to water-based paints has been progressing. In addition, coatings are generally required to have excellent coating properties such as water resistance, alkali resistance, abrasion resistance, and weather resistance. [0003] Polyurethane coatings have been widely used due to their excellent abrasion resistance, toughness, chemical resistance, high gloss and excellent weather resistance. With the enhancement of people's awareness of environmental protection, water-based polyurethane coatings are getting more and more attention. The water-based polyurethane in the prior art usually has hydrophilic groups (such as carboxyl groups) in its molecular chain, and these hydrophilic groups remain in the layer after ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/08C09D105/00C09D7/12
Inventor 梅长林张国胜胡兰
Owner ANHUI JINDUN PAINT
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