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Polyaspartic acid ester prepolymer and preparation method thereof, and corresponding coating

A technology of aspartic acid ester and prepolymer, applied in polyurea/polyurethane coatings, anti-corrosion coatings, coatings, etc., can solve the problem of low elongation at break, achieve insensitivity to temperature and humidity, and improve elongation at break rate, the effect of expanding the scope of application

Active Publication Date: 2020-11-17
SHENZHEN FEIYANG JUNYAN TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in some occasions that require elasticity, such as playgrounds, swimming pools, etc., small molecule aspartic acid esters are not suitable because of their high hardness and low elongation at break

Method used

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  • Polyaspartic acid ester prepolymer and preparation method thereof, and corresponding coating
  • Polyaspartic acid ester prepolymer and preparation method thereof, and corresponding coating
  • Polyaspartic acid ester prepolymer and preparation method thereof, and corresponding coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A polyaspartic acid ester prepolymer, which is a reaction product formed by the reaction of dibasic alcohol, dibasic isocyanate and small molecular type aspartic acid ester; the dibasic alcohol, the dibasic isocyanate and the described The molar ratio between small molecule aspartic acid esters is 1:1.5-3:1-8. The molar weight of the small molecule aspartic acid ester is 2-4 times of the difference between the dibasic isocyanate molar weight and the dibasic alcohol molar weight. The dihydric alcohol is composed of one or more components with the structure HO-R-H, wherein R is R 0 It is H or Me, and the value range of n is 2-30; n 1 The value range is 1-50. The dibasic isocyanate has a structure of OCN-R 1 -One or more components of NCO, wherein, R 1 for R 2 For H or Me. The small molecular polyaspartic acid ester has a structure of Composed of one or more components, wherein, R 3 for R 4 It is a straight chain or branched chain alkyl group containing 1...

Embodiment 2

[0026] A polyaspartic acid ester prepolymer, which is a reaction product formed by the reaction of dibasic alcohol, dibasic isocyanate and small molecular type aspartic acid ester; the dibasic alcohol, the dibasic isocyanate and the described The molar ratio between small molecule aspartic acid esters is 1:2-2.5:2-6. The molar weight of the small molecule aspartic acid ester is 2-4 times of the difference between the dibasic isocyanate molar weight and the dibasic alcohol molar weight. The dihydric alcohol is composed of one or more components with the structure HO-R-H, wherein R is R 0 It is H or Me, and the value range of n is 2-30; n 1 The value range is 1-50. The dibasic isocyanate has a structure of OCN-R 1 -One or more components of NCO, wherein, R 1 for R 2 For H or Me. The small molecular polyaspartic acid ester has a structure of Composed of one or more components, wherein, R 3 for R 4 It is a straight chain or branched chain alkyl group containing 1...

Embodiment 3

[0028] A preparation method of polyaspartic acid ester prepolymer, comprising the following steps:

[0029] Step 1: Under the protection of an inert gas, the temperature is controlled at 60-80°C, and the diol is slowly and uniformly dropped into the dibasic isocyanate to react, and the temperature is lowered after the reaction to obtain the intermediate.

[0030] Step 2: Under the protection of inert gas, the temperature is controlled at 40-60°C, and the above intermediate is slowly and uniformly dropped into the small molecule aspartic acid ester for reaction, and the polyaspartic acid ester prepolymer is obtained by cooling down after the reaction .

[0031] The steps 1 and 2 judge whether the reaction is completed according to the -NCO value of the detection reaction system; when in the step 1, the -NCO value of the reaction system reaches the theoretical remaining -NCO value, it is determined that the reaction of the step 1 is completed; When in step 2, the -NCO value of ...

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Abstract

The invention provides a polyaspartic acid ester prepolymer and a preparation method thereof, and a corresponding coating. The polyaspartic acid ester prepolymer is a reaction product formed by a reaction of dihydric alcohol, binary isocyanate and micromolecular aspartic acid ester, wherein a molar ratio of the dihydric alcohol to the binary isocyanate to the micromolecular aspartate is 1: (1.5-3): (1-8). When the polyaspartic acid ester prepolymer is used for preparing the coating for use, the coating maintains original flexibility, impact resistance, corrosion resistance, aging resistance, good adhesion to a base material, insensitivity to temperature and humidity and the like, but the hardness of the micromolecular aspartic acid ester is reduced, and elongation at break is improved; andthus, the polyaspartic acid ester polyurea coating is suitable for occasions needing elasticity, such as amusement parks and swimming pools, and the application range of the coating prepared from themicromolecular aspartic acid ester is expanded.

Description

technical field [0001] The invention relates to the technical field of polyaspartic ester coatings, in particular to a polyaspartic ester prepolymer, a preparation method thereof, and corresponding coatings. Background technique [0002] Polyaspartic acid ester is prepared by Michael addition of maleic acid diester and polyamine. Due to the synergistic effect of steric hindrance effect and electronic induction effect, the reactivity with isocyanate is greatly reduced, which prolongs the construction time and improves the traditional Polyurea coatings are limited by the disadvantages of spray application. Polyaspartate polyurea is called the third-generation polyurea, which is a slow-response, high-performance polyurea with excellent flexibility, impact resistance, corrosion resistance, aging resistance, and good adhesion to the substrate. It has good strength, is not sensitive to temperature and humidity, and has a high content of solid components, which is conducive to env...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/48C08G18/32C08G18/12C09D175/02C09D5/08
CPCC08G18/6685C08G18/48C08G18/3234C08G18/12C09D175/02C09D5/08
Inventor 徐涛杨轩熊东路龙绪俭肖增钧鲁晓东李斌仁陈林生
Owner SHENZHEN FEIYANG JUNYAN TECH DEV
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