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Highly functional polyisocyanates containing allophanate and silane groups

A technology of allophanate and polyisocyanate, which is applied in the field of high-functional polyisocyanate and substituted aromatic or araliphatic groups, and can solve problems such as reduction

Inactive Publication Date: 2011-04-27
COVESTRO DEUTSCHLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, such modifications inevitably lead to a reduction in the average isocyanate functionality relative to the polyisocyanate initially used

Method used

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  • Highly functional polyisocyanates containing allophanate and silane groups
  • Highly functional polyisocyanates containing allophanate and silane groups
  • Highly functional polyisocyanates containing allophanate and silane groups

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0194] Example 1 (this invention)

[0195] 216.3 g (0.7 mol) of hydroxycarbamate A1) containing silane groups were mixed with 18.6 g (0.3 mol) of 1,2-ethanediol, whose content corresponds to 8.6 wt of the amount of hydroxycarbamate A1) %, add 2520.0g (15.0mol) hexamethylene diisocyanate (HDI) under dry nitrogen at a temperature of 80°C, and stir for 3 hours until the content of NCO is 43.8%, which is equivalent to complete carbamate . The reaction mixture was then heated to 95° C. and 0.5 g of zinc(II) 2-ethyl-1-hexanoate was added as allophanation catalyst. As the reaction started exothermically, the temperature of the mixture rose to 110°C. After about 30 minutes, the NCO content of the reaction mixture was 40.7%. The catalyst was deactivated by adding 1 g of benzoyl chloride, and unreacted monomer HDI was separated off in a thin-film evaporator at a temperature of 130° C. and a pressure of 0.1 mbar. 697 g of almost colorless, transparent allophanate polyisocyanate hav...

Embodiment 2

[0202] Example 2 (this invention)

[0203] According to the method described in Example 1, 1680 g (10.0 mol) of HDI were mixed with 247.2 g (0.8 mol) of hydroxycarbamate A1) containing silane groups and 15.2 g (0.2 mol) of 1,3-propanediol reaction, their amount corresponds to 6.1% by weight of the amount of hydroxycarbamate A1). The allophanation reaction was started at an NCO content of 40.70% by adding 0.5 g of zinc(II) 2-ethyl-1-hexanoate. After the NCO content reached 36.7%, the reaction mixture was quenched with 1 g of benzoyl chloride and worked up as described in Example 1. 673 g of almost colorless, transparent allophanate polyisocyanate having the following characteristics are obtained:

[0204] NCO content: 14.9%

[0205] Monomer HDI: 0.07%

[0206] Viscosity (23°C): 1550mPas

[0207] Color value (APHA): 21 Hazen

[0208] NCO functionality: >3.2 (calculated)

[0209] Silyl content: 8.7% (as SiO 3 Calculation; molar mass=76g / mol)

Embodiment 3

[0210] Example 3 (this invention)

[0211] According to the method described in Example 1, 2520.0 g (15.0 mol) of HDI were mixed with 200.9 g (0.65 mol) of hydroxycarbamate A1) containing silane groups and 31.5 g (0.35 mol) of 1,3- Butanediol reaction, their amount corresponds to 15.7% by weight of the amount of hydroxycarbamate A1). The allophanation reaction was started at an NCO content of 43.7% by adding 0.5 g of zinc(II) 2-ethyl 1-hexanoate. After the NCO content reached 40.7%, the reaction mixture was quenched with 1 g of benzoyl chloride and worked up as described in Example 1. 631 g of almost colorless, transparent allophanate polyisocyanate having the following characteristics are obtained:

[0212] NCO content: 16.1%

[0213] Monomer HDI: 0.08%

[0214] Viscosity (23°C): 1250mPas

[0215] Color value (APHA): 19Hazen

[0216] NCO functionality: > 3.4 (calculated)

[0217] Silyl content: 6.9% (as SiO 3 Calculation; molar mass=76g / mol)

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Abstract

The invention relates to high-functional polyisocyanates containing allophanate and silane groups, a method for their production and their use as a starting component in the production of polyurethane plastics, in particular as a crosslinker component in polyurethane paints and coatings.

Description

[0001] related application [0002] This application claims priority from German Patent Application No. 102009047964.3 filed 1 October 2009, which is hereby incorporated by reference in its entirety for all useful purposes. Background technique [0003] This application relates to highly functional polyisocyanates containing allophanate and silane groups, their preparation and their use as starting components in the production of polyurethane plastics, in particular as crosslinker groups in polyurethane paints or coatings points of use. [0004] Polyisocyanate mixtures comprising alkoxysilane groups have been known for quite some time. These products contain, in addition to the isocyanate groups, a second reactive structure, i.e. they are capable of crosslinking, and have been used in various polyurethane systems and applications in the past for special properties, e.g. for improving the adhesion of coatings strength, chemical resistance or scratch resistance. [0005] For...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/78C08G18/77C08G18/38C08L75/04C09D175/04
CPCC08G18/089C08G18/7837C08G18/3821C08G18/289C07F7/1836C08G18/3253C09D175/02C08G18/809C07F7/1892C09D175/04C08G18/8016C07F7/1804C08G18/32C08G18/4269C08G18/44C08G18/4692C08G18/61C08G18/72
Inventor H-J·拉斯T·贝克尔M·梅希特尔
Owner COVESTRO DEUTSCHLAND AG