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Carbodiimide modified polyisocyanate, preparation method thereof and catalyst system

A polyisocyanate and carbodiimide technology, applied in the field of modified isocyanates, can solve problems such as reducing the crystallization point of products

Active Publication Date: 2021-07-06
WANHUA CHEMICAL (NINGBO) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Under the premise of ensuring that the composition of the product itself does not change significantly and the application performance of the product is not changed, the method of effectively reducing the crystallization point of the product has not yet been reported in related technologies

Method used

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  • Carbodiimide modified polyisocyanate, preparation method thereof and catalyst system
  • Carbodiimide modified polyisocyanate, preparation method thereof and catalyst system
  • Carbodiimide modified polyisocyanate, preparation method thereof and catalyst system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Tetramethylgermanium and triethyl phosphate are mixed uniformly at 45°C in a mass ratio of 1:1000 as a composite catalyst for later use. 600g diphenylmethane diisocyanate in N 2 Stir in the atmosphere, add 1wt% compound catalyst, mix evenly and quickly heat to 150°C, add 120g of diphenylmethane diisocyanate quickly after 3 hours of reaction, and cool down to 80°C with circulating water at the same time, continue stirring for 30min to get the final product . At this time, the monomer content in the product is 75%, the composition of carbodiimide and uretonimine is 20%, the content of the structural component of formula I is 5%, and the product can be stored in a liquid state for 180 days at -15°C.

[0057] Formula I structural formula:

[0058]

[0059] The mass spectrum result of formula I is as follows:

[0060] Chemical Formula: C 73 h 50 N 10 o 6

[0061] Exact Mass: 1162.39

[0062] Molecular Weight: 1163.24

[0063] m / z: 1162.39 (100.0%), 1163.39 (82.6...

Embodiment 2

[0067] Mix dibutyltin dilaurate and triethyl phosphate at a mass ratio of 3:1000 at 45°C and use it as a composite catalyst for future use. 600g diphenylmethane diisocyanate in N 2 Stir in the atmosphere, add 3wt% of the compound catalyst, mix evenly and quickly heat to 180°C, react for 2.5h and quickly add 180g of diphenylmethane diisocyanate, and cool down to 80°C with circulating water at the same time, continue stirring for 30min to get the final product. At this time, the monomer content in the product is 72%, the composition of carbodiimide and uretonimine is 22%, the content of the structural component of formula I is 6%, and the product can be stored in a liquid state for 200 days at -15°C.

Embodiment 3

[0069] Mix tetraethylgermanium and triethyl phosphate at a mass ratio of 5:1000 at 45°C and use it as a composite catalyst for later use. 600g diphenylmethane diisocyanate in N 2 Stir in the atmosphere, add 5wt% compound catalyst, mix evenly and quickly heat to 195°C, add 200g of diphenylmethane diisocyanate quickly after 2 hours of reaction, and cool down to 80°C with circulating water at the same time, continue stirring for 30min to get the final product . At this time, the monomer content in the product is 69%, the composition of carbodiimide and uretonimine is 23%, the content of the structural component of formula I is 8%, and the product can be stored in a liquid state for 220 days at -15°C.

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PUM

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Abstract

The invention relates to a carbodiimide modified polyisocyanate, a preparation method thereof and a catalyst system. An organic tin compound and / or an organic germanium compound and a phosphate ester compound catalyst are / is used; and the prepared carbodiimide modified polyisocyanate contains an R group which is a residue of polyisocyanate. The crystallization point of a polyisocyanate composition containing carbodiimide and uretonimino is obviously reduced, it can be guaranteed that the modified polyisocyanate is not crystallized after being stored at -15 DEG C for 180 days or above, and the carbodiimide reaction time is obviously shortened.

Description

technical field [0001] The invention relates to the field of modified isocyanate, in particular to carbodiimide modified polyisocyanate. Background technique [0002] Isocyanate can be polycondensed under certain conditions to release CO 2 Afterwards, carbodiimide (CDI) derivatives are generated, and the carbodiimide group can undergo addition reaction with isocyanate to form uretonimine (UTI). By this method, the isocyanate contains CDI and UTI substances. The freezing point of the modified isocyanate is lowered, and it is liquid at room temperature. Its good storage stability is beneficial to long-distance transportation and downstream applications, and the products prepared from this modified isocyanate have light resistance, flame resistance, hydrolysis resistance, and increased initial strength. Get some improvement. Patents US2853473A, US5610408A, and US6362247B all report carbodiimidization of isocyanates. [0003] The catalysts used to prepare carbodiimide-modifie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C263/18C07C265/14C07D251/52B01J31/22B01J31/02B01J31/12B01J31/04
CPCC07C263/18C07C265/14C07D251/52B01J31/2208B01J31/122B01J31/0258B01J31/04C07C2601/14B01J35/19
Inventor 包金鹏朱梦雅陈盟肖应鹏王文博
Owner WANHUA CHEMICAL (NINGBO) CO LTD
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