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A storage-stable polyisocyanate composition

A technology of polyisocyanate and diisocyanate, applied in the field of polyisocyanate composition, can solve problems such as differences in application performance, and achieve the effect of convenient source and excellent moisture stability

Active Publication Date: 2022-08-05
WANHUA CHEMICAL (NINGBO) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN104024219A describes the disadvantages of these compounds, because the pronounced crystallization tendency of the toluenesulfonamide formed by reaction with water leads to the blocking of the paint
The difference from the addition of active substances that react with water as described above is that it changes the composition of polyisocyanate, which will cause differences in its application performance

Method used

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  • A storage-stable polyisocyanate composition
  • A storage-stable polyisocyanate composition
  • A storage-stable polyisocyanate composition

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0058] Preparation of polyisocyanate composition:

[0059] Under nitrogen protection, 800 g of hexamethylene diisocyanate was heated and stirred in a 75°C water bath for 1.5 h, and then 0.6 g of a 20 wt% solution of N,N,N-trimethylbenzylammonium hydroxide in isooctanol (0.6 g) 150ppm), control the reaction temperature to be 70 ℃ by regulating the temperature of the water bath; when the reaction conversion rate reaches 42%, add di-2-ethylhexyl phosphate 0.16g (200ppm) to terminate the reaction, then, use a thin film evaporator, in The polyisocyanate composition was obtained by distillation twice under the conditions of 150°C and 0.4 Torr.

[0060] The obtained polyisocyanate composition had a chromaticity of 18 Hazen, a viscosity of 2880 mPa·s (25° C.), an NCO content of 21.8 wt %, and a monomer content of 0.12 wt %.

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Abstract

The present invention provides a polyisocyanate composition that is storage stable under humid conditions. The polyisocyanate composition comprises a compound A having an isocyanurate structure and a compound A represented by the following formula (I) obtained by trimerization of an ali (cyclic) diisocyanate monomer, wherein, relative to the polyisocyanate composition The mass of the compound A is 20 ppm or more and 500 ppm or less. In compound A, X is an N or P atom, Z is an O or S atom, one or two of R1, R2 and R3 are halogen atoms, and the others are the same or different aryl groups with 1-10 carbon atoms, Alkyl, aryloxy, alkoxy,

Description

technical field [0001] The present invention relates to a storage-stable polyisocyanate composition. Background technique [0002] Urethane-based coating compositions using polyisocyanates as curing agents are widely used as coatings for automobiles, building interiors and exteriors, and home appliances because the resulting coating films are excellent in chemical resistance, flexibility, and weather resistance. coating. Among them, polyisocyanates having an isocyanurate structure derived from ali (cyclo)diisocyanates have the characteristics of no yellowing, and are widely used in fields where these properties are required. When the polyisocyanate is mixed with the main agent and used, when the amount of use is small, the same tank needs to be opened and closed many times for use, so there is a problem that the isocyanate group reacts with the moisture in the air. [0003] p-toluenesulfonyl isocyanate (H 3 C(C 6 H 4 )SO 2 -NCO) and triethyl orthoformate are examples o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/79C08K5/521C08K5/5313
CPCC08G18/792C08K5/521C08K5/5313
Inventor 王少华孙立冬胡浩尚永华王暖程史培猛孙积钊韩海涛
Owner WANHUA CHEMICAL (NINGBO) CO LTD
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