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Macromolecular polyaspartic acid ester and preparation method thereof

Active Publication Date: 2021-11-23
山西省建筑科学研究院集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commercialized polyaspartic acid ester is a small molecular type secondary diamine polyaspartic acid ester, and the gel time of its reaction with polyisocyanate is generally between 15 seconds and 10 minutes, although it is shorter than traditional polyurea The curing time is slow, but there is still a big gap compared with the requirements of manual construction
At the same time, the polyurea resin prepared from small molecular secondary diamine polyaspartate has low elongation at break and low tensile strength, which limits the application of polyaspartate to a certain extent.

Method used

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  • Macromolecular polyaspartic acid ester and preparation method thereof
  • Macromolecular polyaspartic acid ester and preparation method thereof
  • Macromolecular polyaspartic acid ester and preparation method thereof

Examples

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preparation example Construction

[0049] In addition, the present invention also provides a preparation method of macromolecular polyaspartic acid ester, said method comprising the following steps:

[0050] a) reacting polyether polyol and polyisocyanate to obtain a polyether prepolymer terminated at both ends by said polyisocyanate;

[0051] b) reacting equimolar N-ethylethylenediamine and a dicarboxylic acid ester to obtain N-ethylethylenediamine capped at one end by said dicarboxylic acid ester; and

[0052] c) mixing and heating the polyether prepolymer obtained in step a) and the N-ethylethylenediamine terminated at one end by the dicarboxylic acid ester obtained in step b) to obtain the The macromolecular polyaspartic acid ester described above.

[0053] According to some embodiments of the present invention, the polyether polyol is selected from polyethylene oxide polyols, polypropylene oxide polyols and polytetrahydrofuran polyols having a hydroxyl functionality of 2 or 3 and a number average molecula...

Embodiment 1

[0086] Add 500 grams of polytetrahydrofuran with a hydroxyl functionality of 2 and a molecular weight of 2000 and 112 grams of isophorone diisocyanate in a four-necked flask equipped with a stirrer, a thermometer, a nitrogen inlet, and a reflux device, and feed nitrogen into the mixture. Heating to 90° C. and reacting for 3 hours to obtain a polytetrahydrofuran prepolymer whose two ends are blocked by isophorone diisocyanate.

[0087] Add 44 grams of N-ethylethylenediamine in a four-necked flask equipped with a stirrer, a thermometer, a nitrogen inlet and a reflux device, feed nitrogen, and slowly dissolve 86 grams of diethyl maleate under cooling conditions in a water bath at 0 ° C. Add it dropwise, and then stir at room temperature for 2.0 hours to obtain N-ethylethylenediamine with one end capped by diethyl maleate. Slowly drop 612 grams of the polytetrahydrofuran whose both ends are blocked by isophorone diisocyanate prepared above into it under the condition of cooling in...

Embodiment 2

[0089] Add 1000 grams of polytetrahydrofuran and 84 grams of hexamethylene diisocyanate with a hydroxyl functionality of 2 and a molecular weight of 4000 and 84 grams of hexamethylene diisocyanate in a four-necked flask equipped with a stirrer, a thermometer, a nitrogen inlet, and a reflux device. Heating to 90° C. for 2 hours to obtain a polyether prepolymer whose two ends are blocked by hexamethylene diisocyanate.

[0090] Add 44 grams of N-ethylethylenediamine in the four-necked flask equipped with stirrer, thermometer, nitrogen inlet and reflux device, pass into nitrogen, slowly dissolve 114 grams of dibutyl maleate under 0 ℃ water bath cooling condition Add it dropwise, and then stir at room temperature for 2 hours to obtain N-ethylethylenediamine whose end is capped with diethyl maleate. Slowly drop 1112 grams of the polytetrahydrofuran whose both ends are capped by hexamethylene diisocyanate prepared above into it under the condition of cooling in a water bath, heat to ...

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Abstract

The present invention provides a macromolecular polyaspartic acid ester, the macromolecular polyaspartic acid ester has a structure represented by the following general formula (1), wherein R is a straight polyaspartic acid ester having 1-4 carbon atoms Chain or branched alkyl or aryl group with 6-8 carbon atoms; X is a divalent residue obtained after removing two hydroxyl groups from polyether polyol; Y is a polyisocyanate after removing two isocyanate groups The resulting bivalent residue. In addition, the present invention also provides a preparation method for the macromolecular polyaspartic acid ester. According to the technical scheme of the present invention, a kind of macromolecule type polyaspartic acid ester with improved physical property is provided, when the polyaspartic acid ester prepared by this method is reacted with polyisocyanate, in prolonging polyurea resin While improving the gel time, the physical properties of the polyurea resin are improved.

Description

technical field [0001] The invention relates to a slow-response polyurea component and a preparation method thereof, in particular to a macromolecular polyaspartic acid ester and a preparation method thereof. Background technique [0002] Polyaspartate is a new type of hindered amine developed in recent years. The curing reaction of polyaspartate with polyisocyanate can form polyurea resin. The gel time of the curing reaction between polyaspartic acid ester and polyisocyanate depends on the structure of polyaspartic acid ester, and the use of substituents with different structures can obtain polyaspartic acid ester derivatives with different reaction speeds and different physical properties. Its derivative coating film has excellent yellowing resistance, ultraviolet aging resistance and wear resistance, and is an important class of polyurea polymer materials. [0003] Polyaspartate is a sterically hindered aliphatic secondary diamine. The amine group in its structure is sy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/10
Inventor 翟现明
Owner 山西省建筑科学研究院集团有限公司
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