Method for preparing modified isocyanate mixture containing carbodiimide and/or uretonimine derivatives

A technology of carbodiimide and carbodiimide catalyst is applied in the field of preparing modified isocyanate mixture with improvement, and can solve the problems such as rapid decrease of NCO content, increase of viscosity, unsatisfactory appearance and color number of products, etc. Achieve the effect of good storage stability at room temperature and optimized reaction process

Active Publication Date: 2021-06-29
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Existing methods for preparing liquid isocyanates containing CDI and / or UTI groups, products using high-efficiency catalysts have poor storage stability, NCO content drops rapidly during storage and transportation, and viscosity rises significantly, while products using low-efficiency catalysts are stored The stability is excellent, but the appearance color number of the product does not meet the requirements, so it is necessary to find a new preparation method to overcome the above defects

Method used

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  • Method for preparing modified isocyanate mixture containing carbodiimide and/or uretonimine derivatives
  • Method for preparing modified isocyanate mixture containing carbodiimide and/or uretonimine derivatives
  • Method for preparing modified isocyanate mixture containing carbodiimide and/or uretonimine derivatives

Examples

Experimental program
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Effect test

Embodiment 1

[0048] 500g diphenylmethane diisocyanate in N 2 Heat to about 50°C while stirring under protection, add 2.5% phosphate ester low-efficiency catalyst, heat up to 205°C quickly after mixing, pass nitrogen gas into the reaction process for stripping, keep the system pressure at 1kpa, and cool the tail gas with a condenser , keep the amount of condensate returned to the system at a reflux ratio of 2:1, react for 180 minutes and reverse diphenylmethane diisocyanate 400g, cool the temperature to 40°C, add 400ppm of triphenyl phosphite and 50ppm of chlorobenzene Phenyl methanesulfonate, the final product.

Embodiment 2

[0050] 500g diphenylmethane diisocyanate in N 2 Heat to about 50°C while stirring under protection, add 2.5% phosphate ester low-efficiency catalyst, heat up to 190°C quickly after mixing, and nitrogen gas is introduced during the reaction process to keep the system pressure at 5kpa, and the tail gas is cooled with a condenser , keep the amount of condensate returned to the system at a reflux ratio of 3:1, react for 240 minutes and reverse diphenylmethane diisocyanate 400g, cool the temperature to 40°C, add 200ppm of trimethyl phosphite and 30ppm of chlorobenzene Phenyl methanesulfonate, the final product.

Embodiment 3

[0052] 500g diphenylmethane diisocyanate in N 2 Heat to about 50°C while stirring under protection, add 2.5% phosphate ester low-efficiency catalyst, heat up to 205°C quickly after mixing, and nitrogen gas is introduced during the reaction process to keep the system pressure at 10kpa, and the tail gas is cooled with a condenser , keep the amount of condensate returned to the system at a reflux ratio of 2:1, react for 180 minutes and reverse diphenylmethane diisocyanate 400g, cool the temperature to 50°C, add 200ppm tricresyl phosphite and 50ppm diisocyanate Ethyl chlorophosphate, the final product.

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Abstract

The present invention relates to a method for preparing modified isocyanate mixtures containing carbodiimide and / or uretonimine derivatives. It comprises the step of subjecting a reaction mixture comprising an isocyanate and a carbodiimidation catalyst to a carbodiimidization reaction, during which the reaction is stripped by an inert gas at a temperature of 180-210° C. and a pressure of 1-20 kPa The volatilized components of the reaction are taken out of the system, and the condensed part is returned to the system. After the reaction, the temperature needs to be at 35-60°C, to the modified isocyanate containing carbodiimide and / or uretonimine derivatives Stabilizers A and B are added to the mixture, thereby preparing a modified isocyanate mixture having improved storage stability, low color number and stable color number.

Description

technical field [0001] The present invention relates to a process for the preparation of modified isocyanate mixtures containing carbodiimide (CDI) and / or uretonimine (UTI) type derivatives. Background technique [0002] Modification of isocyanates to contain carbodiimide (CDI) and / or uretonimine (UTI) derivatives, so-called carbodiimide-modified liquid MDI can be used as coatings, thermosetting elastomers, encapsulation Materials and raw materials such as foam. [0003] Isocyanate can be polycondensed under certain conditions to release CO 2 Afterwards, carbodiimide derivatives are generated, and the carbodiimide group can undergo addition reaction with isocyanate to form a uretonimine group. By this method, the isocyanate contains CDI and UTI substances, which can reduce the melting point of isocyanate. It is liquid at room temperature, and forms a stable low-viscosity liquid for easy transportation, and has good storage stability, and the products prepared from this mod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/79
CPCC08G18/797
Inventor 周也王文博夏以禄王会会刘雪婷陆洋张宏科
Owner WANHUA CHEM GRP CO LTD
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