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Preparation method and application of water-based general automobile coating resin

A general-purpose resin, water-based resin technology, used in polyurea/polyurethane coatings, coatings, pigment pastes, etc., can solve the problems of poor storage stability, floating color, general tinting strength and color development performance, etc. strong effect

Inactive Publication Date: 2013-07-03
汤汉良
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the former has high pigment concentration, strong tinting strength, good color development performance, and good compatibility. However, in some weak dispersion system coatings, when the film is formed, due to the slight difference in fluidity of various pigments and fillers, it is easy to cause floating color and fading. Flowers, and the storage stability of the system is poor; while the latter has relatively low pigment concentration, general tinting strength and color development performance, but relatively stable fluidity and viscosity. Because the system contains resin, the compatibility is limited to a certain extent. There are some problems. Due to the entanglement between the resin and the resin, it is easy to cause the floating color and flowering of the paint. The floating color and flowering are basically impossible to solve through simple treatment, so a kind of paint with good wettability has been developed. , and the general-purpose water-based resin with good compatibility with various resins is the key to our preparation of high-performance water-based automotive coating universal color paste

Method used

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  • Preparation method and application of water-based general automobile coating resin
  • Preparation method and application of water-based general automobile coating resin
  • Preparation method and application of water-based general automobile coating resin

Examples

Experimental program
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Embodiment 1

[0051] according to figure 1 , figure 2 Shown, the present invention has included the following steps:

[0052] 1. Preparation of prepolymers containing carboxyl groups: Mix 50~70kg of difunctional polyester or polyether dehydrated at 100~140℃ and 30~50kg of aliphatic diisocyanate into the reaction kettle, and gradually raise the temperature under nitrogen protection To 60~70°C, keep the reaction at 60~70°C for 1.0~3.0h, make the NCO content in the system reach the theoretical value, and obtain the carboxyl-terminal prepolymer;

[0053] 2. Chain extension of prepolymer: Weigh 4~6kg of dimethylolpropionic acid, fully dissolve it in N-methylpyrrolidone and add it, add 0.1~1.3kg of catalyst, heat up to 78~86℃ for reaction 2~4h, continue to add 4~6kg of tartaric acid, carry out the chain extension reaction at 60~80°C for 1~2h, add acetone and other polar solvents to reduce the viscosity, and obtain a carboxyl-terminated polymer solution;

[0054] 3. Neutralization and emulsifi...

Embodiment 2

[0057] according to figure 1 , figure 2 Preparation of the carboxy-terminal-containing prepolymer shown: Mix 60kg of difunctional polyester or polyether dehydrated at 120°C and 40kg of aliphatic diisocyanate into the reactor, gradually raise the temperature to 65°C under nitrogen protection, and keep at React at 65°C for 2.0 hours to make the NCO content in the system reach the theoretical value.

[0058] Chain extension of the prepolymer: Weigh 5kg of dimethylolpropionic acid, fully dissolve it in N-methylpyrrolidone, add 0.2kg of catalyst, raise the temperature to about 82°C for 3 hours, and continue to add 5kg of tartaric acid, Carry out chain extension reaction at 70° C. for 1.5 h, add acetone and other polar solvents to reduce viscosity, and obtain carboxyl-terminated polymer solution.

[0059] Neutralization and emulsification of high polymer: cool down the high polymer, when the temperature reaches about 40°C, add 5kg of triethylamine neutralizing agent, stir and mix...

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Abstract

The invention relates to a preparation method and an application of water-based general automobile coating resin, in particular to water-based resin of water-based general automobile coating color paste with excellent wetting property, and discloses improved water-based general automobile coating resin and an application thereof. The water-based resin is good in wettability and compatibility; the one-component or two-component water-based automobile coating is high in storage stability; and the water-based general automobile coating color paste can be quickly air-dried at normal temperature and is convenient for popularization and application.

Description

technical field [0001] The invention relates to a resin for automotive coatings, in particular to a water-based resin with excellent wettability and universal color paste for water-based automotive coatings. Background technique [0002] There are two types of water-based color paste systems: one is a resin-free system with high pigment content; the other is a resin system with low pigment content. Among them, the former has high pigment concentration, strong tinting strength, good color development performance, and good compatibility. However, in some weak dispersion system coatings, when the film is formed due to the slight difference in fluidity of various pigments and fillers, it is easy to cause floating color and fading. Flowers, and the storage stability of the system is poor; while the latter has relatively low pigment concentration, general tinting strength and color development performance, but relatively stable fluidity and viscosity. Because the system contains r...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/42C08G18/48C08G18/34C08G18/10C09D17/00C09D175/06C09D175/08
Inventor 汤汉良
Owner 汤汉良
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