Preparation method of oligomerization aspartic resin

A technology of resin and aspartame, which is applied in the field of preparation of aspartame resin, can solve the problems such as the performance discount of aspartame polyurea, and achieve the effect of increasing crosslinking density and improving performance

Pending Publication Date: 2021-03-26
深圳飞扬兴业科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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The performance of the above-menti...

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  • Preparation method of oligomerization aspartic resin
  • Preparation method of oligomerization aspartic resin
  • Preparation method of oligomerization aspartic resin

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Embodiment 1

[0012] The present invention proposes a kind of preparation method of oligomeric aspartame resin, comprises the steps:

[0013] 98g of maleic anhydride and 142g of hexanediol were subjected to an esterification reaction at a temperature of 150 degrees centigrade under the protection of nitrogen. The end point of the reaction was monitored by measuring the acid value, and the reaction was stopped when the acid value was 11.

[0014] The oligomeric unsaturated polyester obtained by the above reaction was added dropwise to a flask containing 226 g (2 equiv.) of 2-methylcyclohexylamine under a nitrogen atmosphere. The temperature was raised to 60°C, and the end point of the reaction was monitored by measuring the amine value. The excess 2-methylcyclohexylamine was distilled off under reduced pressure to obtain the corresponding oligomerized aspart resin.

Embodiment 2

[0016] The present invention proposes a kind of preparation method of oligomeric aspartame resin, comprises the steps:

[0017] 98g of maleic anhydride and 19.8g of neopentyl glycol, 3.04g of propylene glycol, 32.28g of ethylene glycol, 4.24g of diethylene glycol and 34.88g of dipropylene glycol, at a temperature of 150 degrees Celsius, carry out an esterification reaction under nitrogen protection , monitor the end point of the reaction by measuring the acid value, and stop the reaction when the acid value is 10.

[0018] The oligomeric unsaturated polyester obtained by the above reaction was added dropwise to a flask containing 200 g (2 equiv.) of cyclohexylamine under a nitrogen atmosphere. The temperature was raised to 60°C, and the end point of the reaction was monitored by measuring the amine value. The excess cyclohexylamine was distilled off under reduced pressure to obtain the corresponding oligomerized aspart resin.

Embodiment 3

[0020] The present invention proposes a kind of preparation method of oligomeric aspartame resin, comprises the steps:

[0021] Maleic anhydride 98g and 31.66g ethylene glycol, 72.45g dipropylene glycol, under the temperature of 150 degrees centigrade, under the situation of nitrogen protection, carry out esterification reaction, monitor the reaction end point by acid value measurement, stop when the acid value is 12 reaction.

[0022] The oligomeric unsaturated polyester obtained by the above reaction was added dropwise to a flask containing 254 g (2 equiv.) of 2-ethylcyclohexylamine under a nitrogen atmosphere. The temperature was raised to 80°C, and the end point of the reaction was monitored by measuring the amine value. The excess 2-ethylcyclohexylamine was distilled off under reduced pressure to obtain the corresponding oligomerized aspart resin.

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Abstract

The invention discloses a preparation method of oligomerization aspartic resin. The preparation method comprises the following steps: maleic anhydride and dihydric alcohol or polyhydric alcohol form hydroxyl-terminated oligomerization polyester with the polymerization degree of 2-10; and then carrying out Michael addition reaction on the polyester by sterically hindered primary amine to synthesizethe oligomeric polyfunctional aspartic resin. By synthesizing the polyfunctional aspartic resin, namely improving the functionality of secondary amine in the polyaspartic acid ester, the crosslinkingdensity of the polyaspartic acid ester polyurea can be increased, so that the performance of the polyaspartic acid ester polyurea in an extreme environment is improved.

Description

technical field [0001] The invention relates to the technical field of resin preparation, in particular to a preparation method of oligomerized aspartame resin. Background technique [0002] Aspartic polyurea is the abbreviation of polyaspartate polyurea, which is the third generation of polyurea. And polyaspartic ester (Polyaspartic Ester, PAE) is a kind of special steric hindrance type secondary amine, due to the steric hindrance and inductive effect of ester group, especially the steric hindrance effect and low viscosity of amino substituent The gel time of isocyanate curing agents can be adjusted from minutes to hours. [0003] The current aspartic polyurea systems are all polymerized by difunctional secondary amines and difunctional or trifunctional isocyanate curing agents. Under normal environmental conditions, the application of this aspartic polyurea resin is very good, it has excellent UV resistance and weather resistance (no yellowing and has very high gloss ret...

Claims

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Application Information

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IPC IPC(8): C07C227/08C07C229/24C07C67/08C07C69/60C08G63/688C08G63/676C08G63/78C08G18/46C08G18/32C09D175/02
CPCC07C227/08C07C67/08C08G63/6888C08G63/676C08G63/78C08G18/4623C08G18/3287C08G18/329C09D175/02C07C69/60C07C229/24
Inventor 熊东路鲁晓东龙绪俭徐涛肖增钧李斌仁许超平陈林生
Owner 深圳飞扬兴业科技有限公司
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