Modified isocyanate and preparation method thereof

A technology of isocyanate and diisocyanate, which is applied in the field of modified isocyanate and its preparation, can solve problems such as increased viscosity, storage stability and safety problems, and achieve improved low-temperature storage stability, long-term storage stability, Good low temperature storage stability

Active Publication Date: 2018-11-23
WANHUA CHEM BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The addition of hindered amine additives can control the yellow color that occurs when the carbodiimide reaction is terminated to a certain extent, but amines have a certain catalytic effect on diphenylmethane diisocyanate. When stored for a long time, especially at higher temperatures Under long-term storage, it will catalyze its reaction, and there will be adverse conditions such as increased viscosity and flatulence, which will cause major problems in the storage stability and safety of the product.

Method used

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  • Modified isocyanate and preparation method thereof
  • Modified isocyanate and preparation method thereof
  • Modified isocyanate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Nitrogen is passed into the reactor, and 20kg of MDI-30, heated to 90°C; 31.08g of diethylene glycol and 31.08g of methyl propylene glycol were evenly mixed to obtain a small molecule alcohol; 0.04g of 1-phenyl-3-methyl-2-phospholane Add ene-1-oxide to 0.16g of small molecule alcohol, mix evenly and add to the reactor;

[0060] Add 8 g of 2,6-di-tert-butyl-4-methylphenol and 2 g of pentaerythritol di-isodecyl diphosphite into 50 g of small molecule alcohol, mix evenly and add to the reactor;

[0061] Raise the temperature of the mixture in the reactor to 120°C and react for 2 hours; add 1.2g of p-toluenesulfonic acid to 12g of small molecule alcohol, mix well and add to the reactor to deactivate the catalyst in the mixture by "poisoning";

[0062] The temperature of the mixture in the reactor was lowered to 45° C. and stirred for 3.5 hours to obtain a sample.

[0063] The color number of the obtained sample is 60APHA, and the isocyanate group content is 29.3%; the to...

Embodiment 2

[0065] Nitrogen is passed into the reactor, and 20kg of MDI-50, heated to 90°C;

[0066] Add 0.1 g of 1-methyl-3-methyl-2-phosphole-1-oxide into 0.4 g of isopropanol, mix well and add to the reactor;

[0067] Add 4g of n-octadecyl β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate and 2g of triphenyl phosphite into 20g of isopropanol, mix well and add to the reaction device;

[0068] The temperature of the mixture in the reactor was raised to 110° C., and reacted for 2.5 hours; 1.6 g of trifluoromethanesulfonic acid and 0.2 g of benzoyl chloride were added to 2.7 g of isopropanol, mixed uniformly and added to the reactor to make The catalyst in the mixture is "poisoned" and deactivated;

[0069] The temperature of the mixture in the reactor was lowered to 40°C and stirred for 4 hours to obtain a sample.

[0070] The color number of the obtained sample is 50APHA, and the isocyanate group content is 31.7%; the total mass of the modified isocyanate containing carbodiimide grou...

Embodiment 3

[0072] Nitrogen is passed into the reactor, and 20kg of MDI-100, heated to 90°C;

[0073] Add 0.16g of 1-methyl-3-phenyl-2-phosphole-1-oxide into 0.64g of 1,2-propanediol, mix well and add to the reactor;

[0074] Add 2g of β-(3,5-di-tert-butyl-4-hydroxyphenyl) n-octadecyl propionate and 1g of phosphite 4,4-diisoylidene bisphenol carbon alkyl ester to 60g of 1,2-propanediol, mixed evenly and added to the reactor;

[0075] Raise the temperature of the mixture in the reactor to 95°C and react for 4 hours; add 0.8g of trifluoromethanesulfonic anhydride and 0.8g of adipoyl chloride to 2.4g of 1,2-propanediol, mix well and add to the reactor , to deactivate the catalyst in the mixture by "poisoning";

[0076] The temperature of the mixture in the reactor was lowered to 35°C and stirred for 4 hours to obtain a sample.

[0077] The color number of the obtained sample is 50APHA, and the isocyanate group content is 27.3%; the total mass of modified isocyanate containing carbodiimi...

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Abstract

The invention relates to modified isocyanate and a preparation method thereof. The modified isocyanate has excellent storage stability and low color number; the color number is smaller than or equal to 100 APHA, is preferably smaller than or equal to 90APHA, and is more preferably smaller than or equal to 70APHA; the viscosity at 25 DEG C is 5 to 500 mPa*s, and is preferably 20 to 200mPa*s; the storage for more than 100 days without crystallization at -15 DEG C can be realized; the obvious gas expansion cannot occur after the storage for more than 100 days at the normal temperature (20 to 35 DEG C); the obvious gas expansion cannot occur after the storage for 72h at the high temperature of 60 to 80 DEG C. The preparation method is simple; the implementation is easy; the product storage stability can be improved.

Description

technical field [0001] The invention relates to a modified isocyanate and a preparation method thereof, in particular to a modified isocyanate with excellent storage stability and low color number. Background technique [0002] As the main raw material in polyurethane chemistry, diphenylmethane diisocyanate is widely used in foam, adhesive and other industries. However, diphenylmethane diisocyanate is easy to crystallize, not conducive to storage and other factors, making it necessary to increase heat preservation, drying and other processes in the process of storage, transportation and use, which is very inconvenient to use and increases expensive transportation and processing costs. . [0003] In the prior art, it has become an industry consensus to modify diphenylmethane diisocyanate by carbodiimide modification to improve its storage stability. Using 4,4-diphenylmethane diisocyanate as a raw material to modify carbodiimide can improve its storage stability to a certain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/79
CPCC08G18/7671C08G18/797
Inventor 何国龙喻建明赵怡张平张海平
Owner WANHUA CHEM BEIJING
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