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Silane-modified polyurea compounds based on polyisocyanates having isocyanurate and allophanate groups

A technology of polyisocyanate and isocyanurate, applied in polyurea/polyurethane coatings, coatings, anti-corrosion coatings, etc., can solve the problems of slow curing of adhesives and low toxicological potential, and achieve low viscosity and high polymer Content, the effect of improving curing performance

Active Publication Date: 2020-08-07
COVESTRO DEUTSCHLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This need resides especially, but not exclusively, in ethoxysilane-modified binders, which are generally preferred due to their low toxicological potential, but cure much faster than comparable methoxysilane-modified binders. slow

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0122] Preparation and Study of Trialkoxysilane Modified Polyurea Compounds

[0123] In a flask equipped with a thermometer, KPG stirrer, reflux condenser and dropping funnel, under nitrogen atmosphere, at room temperature, pre-place polyisocyanate and 1-methoxy-2-propyl acetate (MPA) (About 20-25% by weight of polyisocyanate used). Then, at room temperature, di-n-butylamine was firstly added dropwise within 20-45 minutes. Due to the exotherm of the reaction, the temperature of the reaction mixture rose to 40-50°C. After reaching the theoretically expected isocyanate content, the reaction mixture was heated to 50°C. If the mixture has a very high viscosity, additional 1-methoxy-2-propyl acetate is added before further reaction. Then, at 50° C., diethyl N-(3-triethoxysilylpropyl)aspartate (prepared according to DE 4237468 A1, Example 1) was added dropwise within 60 minutes, and Stirring is continued until no significant NCO content is detectable by IR spectroscopy or by NCO...

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PUM

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Abstract

The invention relates to a polyurea compound that can be produced by reacting a polyisocyanate based on isophorone diisocyanate, which has isocyanurate and allophanate groups, with an amino silane according to general formula (I): R1 a(R1O)(3-a)Si(CH2)nNHCHR2CH2COOR3 (I), wherein the groups R1 are selected independently from one another from C1-C20-alkyl or C6-C20-aryl, a is a whole number between0 and 2, n is a whole number between 1 and 4, R2 is selected from H, C1-C20-alkyl, C6-C12-aryl and -COOR3, and R3 is a respective C1-C20-alkyl. The invention also relates to the use of the compound as a binder for producing coatings.

Description

technical field [0001] The invention relates to silane-modified polyurea compounds based on polyisocyanates having isocyanurate and allophanate groups and their use as binders in coatings, in particular in the field of corrosion protection. Background technique [0002] The use of alkoxysilane-modified polyurea compounds as binders in coatings is known. This compound has alkoxysilane end groups which have the property of hydrolyzing on contact with small amounts of moisture to organosilicon alkanols and polymerizing to organosiloxanes by subsequent condensation. This polymerization leads to crosslinking, also called curing, of the silane-modified polyurea compound. Due to this ability to further crosslink, silane-modified polyurea compounds are also known as silane-terminated prepolymers (STP) and are suitable as binders for moisture-curing coatings. [0003] EP 0 949 284 A1 describes silane-modified polyisocyanates having a proportion of free isocyanate groups of 0.2 to 2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/75C08G18/80C08G18/28
CPCC08G18/755C08G18/809C08G18/289C09D175/02C09D5/08C08G71/02
Inventor T.富尔舍J.克歇尔T.许特勒M.施特鲁韦M.温特曼特尔
Owner COVESTRO DEUTSCHLAND AG
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