Polyisocyanate composition with storage stability
A technology of polyisocyanate and isocyanurate, which is 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: 2021-05-28
WANHUA CHEMICAL (NINGBO) CO LTD +1
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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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preparation example Construction
[0058] Preparation of polyisocyanate composition:
[0059] Under nitrogen protection conditions, 800g of hexamethylene diisocyanate was heated and stirred in a 75°C water bath for 1.5h, and then 0.6g of a 20wt% isooctyl alcohol solution of N,N,N-trimethylbenzyl ammonium hydroxide was added ( 150ppm), by regulating and controlling the water bath temperature control reaction temperature is 70 ℃; Distilled twice under conditions of 150°C and 0.4 Torr to obtain a polyisocyanate composition.
[0060] The chromaticity of the obtained polyisocyanate composition was 18 Hazen, the viscosity was 2880 mPa·s (25° C.), the NCO content was 21.8 wt %, and the monomer content was 0.12 wt %.
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Abstract
The present invention provides a polyisocyanate composition with storage stability under humid conditions. The polyisocyanate composition comprises a compound A which is obtained through a trimerization reaction of an aliphatic (cyclic) diisocyanate monomer, has an isocyanurate structure and is represented by the following formula (I), and the addition amount of the compound A is more than 20 ppm and less than 500 ppm relative to the mass of the polyisocyanate composition. In the compound A, the X is an N or P atom, the 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, alkyl, aryloxy and alkoxy with the carbon number of 1-10.
Description
technical field [0001] The present invention relates to a storage-stable polyisocyanate composition. Background technique [0002] Urethane-based coating compositions using polyisocyanate as a curing agent are widely used as coatings for automobiles, building interiors and exteriors, and home appliances because the resulting coating film has excellent chemical resistance, flexibility, and weather resistance. coating. Among them, polyisocyanates having an isocyanurate structure derived from aliphatic (cyclo)diisocyanates are characterized by non-yellowing and are widely used in fields requiring these properties. When polyisocyanate is used in combination with the main ingredient, if the amount used is small, the same tank needs to be opened and closed multiple times for use, so there is a problem that isocyanate groups react with moisture in the air. [0003] p-toluenesulfonyl isocyanate (H 3 C(C 6 h 4 ) SO 2 -NCO) and triethylorthoformate are examples of water scavenge...
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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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