Preparation method of polyaspartate resin

An aspartic acid ester and resin technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of expanding the scope of use, prolonging the construction time, and reducing the reaction speed of aliphatic isocyanates by polyaspartic acid resin. Achieve the effect of extending the operating time and expanding the scope of application

Active Publication Date: 2019-02-12
SHENZHEN FEIYANG JUNYAN TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of shortening the construction period caused by the high residual primary amino group content in the preparation process of the existing polyaspartic acid ester resin, the present invention proposes a preparation method of polyaspartic acid ester resin, which The preparation process can quickly eliminate primary amine groups, and the polyaspartic acid resin prepared by this method reduces the reaction speed with aliphatic isocyanate, prolongs the construction time, and expands the scope of use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The raw materials were weighed according to the molar ratio of 4,4'-diaminodicyclohexylmethane, diethyl maleate and methyl acrylate as 1:2:0.05. First, add 4,4'-diaminodicyclohexylmethane into the reaction vessel, add diethyl maleate into the dropping device, control the temperature below 60°C for dropwise addition, and raise the temperature to 70-80°C after the dropwise addition °C for 150 hours; then lower the temperature to 40-50 °C, then add methyl acrylate dropwise at 40-50 °C for 24 hours. After the reaction, the film evaporated the unreacted diethyl maleate and methyl acrylate to obtain polyaspartic acid ester resin. After testing, the pot life of polyaspartic acid ester resin and HDI trimer curing agent is 26 minutes.

Embodiment 2

[0021] The raw materials were weighed according to the molar ratio of 4,4'-diaminodicyclohexylmethane, diethyl maleate and methyl acrylate as 1:2.2:0.05. First, add 4,4'-diaminodicyclohexylmethane into the reaction vessel, add diethyl maleate into the dropping device, control the temperature below 60°C for dropwise addition, and raise the temperature to 80-90°C after the dropwise addition °C for 110 hours; then lower the temperature to 50-60 °C, then add methyl acrylate dropwise at 50-60 °C for 20 hours. After the reaction, the film evaporated the unreacted diethyl maleate and methyl acrylate to obtain polyaspartic acid ester resin. After testing, the pot life of polyaspartic acid ester resin and HDI trimer curing agent is 27 minutes.

Embodiment 3

[0023] Weigh the raw materials according to the molar ratio of 4,4'-diaminodicyclohexylmethane, diethyl maleate and methyl acrylate as 1:2:0.1. First, add the diethyl maleate to the reaction vessel Add it into the dropping device, control the temperature below 60°C for dropwise addition, after the dropwise addition, raise the temperature to 70-80°C and react for 150 hours; then cool down to 40-50°C, then add dropwise methyl acrylate at 40-50°C for 24 hours Hour. After the reaction, the film evaporated the unreacted diethyl maleate and methyl acrylate to obtain polyaspartic acid ester resin. After testing, the pot life of polyaspartic acid ester resin and HDI trimer curing agent is 26 minutes.

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Abstract

The invention discloses a preparation method of polyaspartate resin and relates to the technical field of synthetic resin, mainly aiming at solving the problems of an existing synthesis method of thepolyaspartate resin that the speed of transforming primary amine into secondary amine at a later period is too low, the residual amount of primary amine radicals in a resin finished product is high, and the primary amine cannot be completely transformed even if the reaction time is prolonged . The reaction speed of the residual primary amine and an isocyanate curing agent is too rapid, the operation time is shortened, the construction is not easy to realize and an application range is limited. The invention provides the preparation method of the polyaspartate resin; the preparation method comprises the following steps: firstly, carrying out addition reaction on aliphatic hydrocarbonyl binary amine and maleate; then adding acrylate and carrying out addition reaction. The preparation processcan be used for rapidly eliminating the primary amine, reducing the reaction speed of the primary amine and the isocyanate curing agent, prolonging the construction period and expanding the applicable range.

Description

technical field [0001] The invention relates to the technical field of resin synthesis, in particular to a preparation method of polyaspartic acid ester resin. Background technique [0002] Polyaspartic acid ester resin is a high-solid low-viscosity resin containing secondary amino groups synthesized by the Michael addition method of aliphatic diamines and maleic acid esters. Polyaspartic ester resin is combined with aliphatic isocyanate curing agent to prepare polyaspartic ester coatings with excellent mechanical properties and aging resistance. However, due to the very fast reaction speed between the small amount of primary amino groups remaining in the polyaspartate resin synthesis process and the aliphatic isocyanate, the heat of reaction is large, resulting in shortened construction period and limited the scope of use. Contents of the invention [0003] In order to solve the problem of shortening the construction period caused by the high residual primary amino group...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/64C09D175/02
CPCC08G18/6415C09D175/02
Inventor 谢夏陆邬茳朱龙晖赵粕利王海洋鲁晓东
Owner SHENZHEN FEIYANG JUNYAN TECH DEV
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