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Method for preparing novel polyaspartic ester and application thereof

A new type of polyaspartic acid ester technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the physical properties of polyurea materials without mentioning tensile strength, elongation, and macromolecular primary Amine, gel time is not long enough, etc., to achieve the effect of changing low adhesion, excellent mechanical properties, and performance improvement

Inactive Publication Date: 2010-09-01
SHANGHAI RES INST OF BUILDING SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can achieve a conversion rate of 100% within a few hours, the disadvantage is that the gel time is not long enough when reacting with polyisocyanate, only tens of seconds; And the use of macromolecular primary amines in the synthesis, there is no mention of the physical properties such as tensile strength and elongation of polyurea materials prepared by the reaction of flexible polyaspartic acid ester and isocyanate prepared by this method
The disadvantage of this method is that it cannot be fully responded in a short period of time, and it takes one month to complete 100%
These methods all use Michael addition reaction to synthesize polyaspartic acid ester, but there are deficiencies, such as low conversion rate in a short period of time, long synthesis time, inability to supply goods in time, difficulty in industrial production or low product performance after curing

Method used

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  • Method for preparing novel polyaspartic ester and application thereof
  • Method for preparing novel polyaspartic ester and application thereof
  • Method for preparing novel polyaspartic ester and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 4,4'-Diaminocyclohexylmethane was vacuum-dried, diethyl maleate was distilled under reduced pressure, and epoxy resin was vacuum-dried.

[0033] The four-necked flask was equipped with a stirrer, heating unit, addition funnel and nitrogen inlet. 105 grams (0.5 equivalents) of 4,4'-diaminocyclohexylmethane was packed into a flask, and nitrogen protection was carried out. 172 g of diethyl maleate (1.0 equivalent) was added to the flask through an addition funnel within 1 hour, and the temperature was controlled not to exceed 60° C. during the addition. After the feeding was completed, the temperature was controlled at 80° C., and the reaction was carried out for 20 hours. At this point 95% of the 4,4'-diaminocyclohexylmethane was converted to polyaspartate. Add 18 grams (0.09 equivalents) of bisphenol A epoxy resin E-51, control the addition within 10 minutes, raise the temperature to 120 ° C for 2 hours, cool to room temperature, and obtain a transparent, light yellow ...

Embodiment 2

[0035] Polyetheramine D-230 is vacuum-dried, diethyl maleate is distilled under reduced pressure, and epoxy resin is vacuum-dried.

[0036] The four-necked flask was equipped with a stirrer, heating unit, addition funnel and nitrogen inlet. Put 115 grams (0.5 equivalent) of polyetheramine D-230 into the flask, and protect it with nitrogen. 172 g of diethyl maleate (1.0 equivalent) was added to the flask through an addition funnel within 1 hour, and the temperature was controlled not to exceed 60° C. during the addition. After the feeding was completed, the temperature was controlled at 80° C., and the reaction was carried out for 20 hours. At this point 94% of the polyetheramine D-230 had been converted to polyaspartate. Add 18 grams (0.09 equivalents) of bisphenol A epoxy resin E-51, control the addition within 10 minutes, raise the temperature to 120 ° C for 2 hours, cool to room temperature, and obtain a transparent, light yellow liquid, and the reaction is 100% complete....

Embodiment 3

[0038] Polyetheramine D-2000 is vacuum-dried, diethyl maleate is distilled under reduced pressure, and epoxy resin is vacuum-dried.

[0039] The four-necked flask was equipped with a stirrer, heating unit, addition funnel and nitrogen inlet. Put 1000 g (0.5 equivalent) of polyetheramine D-2000 into the flask, and protect it with nitrogen. 172 g of diethyl maleate (1.0 equivalent) was added to the flask through an addition funnel within 1 hour, and the temperature was controlled not to exceed 60° C. during the addition. After the feeding was completed, the temperature was controlled at 80° C., and the reaction was carried out for 20 hours. At this point 93% of the polyetheramine D-2000 was converted to polyaspartate. Add 18 grams (0.09 equivalents) of bisphenol A epoxy resin E-51, control the addition within 10 minutes, raise the temperature to 120° C. and keep for 2 hours, and cool to room temperature to obtain a transparent, yellow liquid, and the reaction is 100% complete....

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Abstract

The invention discloses a method for preparing novel polyaspartic ester, in particular a method for preparing a component for slow reaction type polyurea paints. The method comprises the following concrete steps of: 1) performing a catalytic reaction of dicarboxylic ester and primary amine to obtain a Michael additive product; and 2) adding epoxy resin into the product obtained in the step 1) to obtain the novel polyaspartic ester after reaction. The method for preparing the novel polyaspartic ester shortens the reaction time, improves the reaction conversion ratio, and conveniently realizes industrial preparation. Due to the adoption of the method, the problems of low conversion ratio in short time, long synthesis time, failure of timely delivery, difficult industrial production or low product performance after solidification in the prior art are solved. The novel polyaspartic ester has high tensile strength and high elongation rate.

Description

technical field [0001] The invention relates to a preparation method of a novel polyaspartic acid ester, in particular to a preparation method of a slow-response polyurea coating component. Background technique [0002] Traditional polyurea has fast reaction speed (5-10s), poor adhesion, complex coating molding, and reduced performance. Construction requires special equipment, accurate measurement, high requirements for operators, and difficult operation. These all limit the application of traditional polyurea. Polyaspartate polyurea is a new type of aliphatic, slow-response, high-performance coating material that has emerged in recent years, and is called the third-generation polyurea. Polyaspartate polyurea is generally a two-component coating, which is based on polyaspartate and cured by adding polyisocyanate components. Polyaspartic ester polyurea is a low-activity, slow-response aliphatic polyurea, which can effectively overcome the disadvantages of reduced complex pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/00C08G59/14C08G18/64C08G18/58C09D175/02
Inventor 王立平李晓平丁志明
Owner SHANGHAI RES INST OF BUILDING SCI CO LTD
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