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A kind of carbodiimide modified polyisocyanate and 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 the product, and achieve the effects of shortening the reaction time, good switching, and reducing the formation of higher molecular weight polycyclic structures

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

[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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  • A kind of carbodiimide modified polyisocyanate and preparation method thereof, and catalyst system
  • A kind of carbodiimide modified polyisocyanate and preparation method thereof, and catalyst system
  • A kind of carbodiimide modified polyisocyanate and preparation method thereof, and catalyst system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0057] Formula I structural formula:

[0058]

[0059] The mass spectrometry results of formula I are 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:...

Embodiment 2

[0067] Dibutyltin dilaurate and triethyl phosphate were mixed uniformly at a mass ratio of 3:1000 at 45° C. as a compound catalyst for later use. Dissolve 600 g of diphenylmethane diisocyanate in N 2 Stir in the atmosphere, add 3wt% of the compound catalyst, mix uniformly and quickly heat to 180 ° C, quickly add 180 g of diphenylmethane diisocyanate after the reaction for 2.5 hours, and at the same time pass circulating water to cool down to 80 ° C, continue stirring for 30 minutes to obtain the final product. At this time, the monomer content in the product is 72%, the composition of carbodiimide and uretonimide is 22%, and the content of the structural component of formula I is 6%. The product can be stored in liquid state for 200 days at -15°C.

Embodiment 3

[0069] Tetraethylgermanium and triethyl phosphate were mixed uniformly at 45°C according to a mass ratio of 5:1000 as a compound catalyst for use. Dissolve 600 g of diphenylmethane diisocyanate in N 2 Stir in the atmosphere, add 5wt% of the compound catalyst, mix uniformly and quickly heat to 195 ° C, quickly add 200 g of diphenylmethane diisocyanate after the reaction for 2 h, and at the same time pass circulating water to cool down to 80 ° C, and continue to stir for 30 minutes to obtain the final product . At this time, the monomer content in the product is 69%, the composition of carbodiimide and uretonimide is 23%, and the content of the structural component of formula I is 8%. The product can be stored in 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. Using organotin compound and / or organogermanium compound, and phosphate compound catalyst; the prepared carbodiimide-modified polyisocyanate contains a residue whose R group is polyisocyanate. The crystallization point of the polyisocyanate composition containing carbodiimide and uretonimide groups is obviously reduced, and the modified polyisocyanate can be guaranteed not to crystallize when stored at -15°C for more than 180 days, and the reaction time of carbodiimide is significantly shortened.

Description

technical field [0001] The invention relates to the field of modified isocyanates, in particular to carbodiimide-modified polyisocyanates. Background technique [0002] Isocyanates can be polycondensed to release CO under certain conditions 2 After that, carbodiimide (CDI) derivatives are generated, and the carbodiimide group can undergo an addition reaction with isocyanate to form uretonimine (UTI). The freezing point of 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 properties such as light resistance, flame resistance, hydrolysis resistance, and increased initial strength. get some improvement. Patents US2853473A, US5610408A and US6362247B have all reported on the carbodiimization of isocyanates. [0003] The catalysts used for the preparation of carbodiimide-modified isocyanates are ma...

Claims

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Application Information

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Patent Type & Authority Patents(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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