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A kind of preparation method of low color number and low voc modified isocyanate

An isocyanate and diisocyanate technology, which is applied in the field of preparation of low-color and low-VOC modified isocyanates, can solve the problems of large amount of silane-based organics, increased viscosity and high cost, and achieves small changes in system viscosity, reduced VOC content, and guaranteed stability. sexual effect

Active Publication Date: 2022-08-02
WANHUA CHEMICAL (NINGBO) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] CN107879951 uses silane-based organic compounds compounded acid anhydride as a new terminator, which has achieved good results, but the modified product prepared by this method is still unstable at a temperature above 100°C, the viscosity rises rapidly, and CO is continuously released. 2 , its high-temperature instability limits its application field, and the amount of silane organic compounds required by this method is large, the anhydride is volatile, the final preparation cost is high and the product VOC is high
[0012] In summary, the existing methods for preparing liquid isocyanates containing CDI and / or UTI groups are difficult to overcome the problems of large amount of terminator and the resulting high color number and high VOC

Method used

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  • A kind of preparation method of low color number and low voc modified isocyanate
  • A kind of preparation method of low color number and low voc modified isocyanate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Dissolve 500 g of diphenylmethane diisocyanate in N 2 Heating to 50°C with stirring under protection, adding 0.5ppm of 1-methyl-3-methyl-3-phospholane-1-oxide high-efficiency catalyst, heating to 200°C rapidly after mixing, reacting for 2h and then reacting. After adding 400 g of diphenylmethane diisocyanate, the temperature was quenched to 75° C., 20 ppm of sodium borate, a boron-containing compound, was added, and stirred for 4 h to obtain the final product.

Embodiment 2

[0068] Dissolve 500 g of diphenylmethane diisocyanate in N 2 Heating to 50°C with stirring under protection, adding 12ppm of 1-methyl-3-methyl-3-phospholane-1-oxide efficient catalyst, heating to 80°C rapidly after mixing, reacting for 1.5h and then reacting. After adding 200 g of diphenylmethane diisocyanate, the temperature was quenched to 75° C., 500 ppm of sodium borate, a boron-containing compound, was added and stirred for 4 h to obtain the final product.

Embodiment 3

[0070] Dissolve 500 g of diphenylmethane diisocyanate in N 2 Under the protection, it was heated to 50°C while stirring, and 5ppm of 1-methyl-3-methyl-3-phospholane-1-oxide high-efficiency catalyst was added. After mixing, it was quickly heated to 100°C, and the reaction was reversed after 2 hours. After 400 g of diphenylmethane diisocyanate, the temperature was quenched to 75°C, 10 ppm of boron-containing compound boric acid was added, stirred for 1 hour, and then 200 ppm of p-toluenesulfonic acid was added, and stirred for 2 hours to obtain the final product.

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Abstract

The invention relates to a preparation method of a low color number and low VOC modified isocyanate. The method comprises the following steps: reacting an isocyanate monomer under the action of a phosphorus-containing catalyst to obtain a modified isocyanate reaction solution; adding a boron-containing compound to the reaction solution for a coordination reaction with the phosphorus-containing catalyst to obtain a modified isocyanate; optionally adding a terminator Terminate the reaction. The modified isocyanate prepared by this method has the advantages of low color number, low VOC, long shelf life, and stability under high temperature conditions.

Description

technical field [0001] The invention belongs to the field of isocyanates, and in particular relates to a preparation method of a low color number and low VOC modified isocyanate. 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. [0003] Isocyanate groups are converted into carbodiimide and uretonimine derivatives under the action of high-efficiency catalysts of phosphole, especiall...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C263/18C07C265/14C07C267/00C07D229/00
CPCC07C263/18C07C267/00C07D229/00C07C265/14
Inventor 肖应鹏王文博陈盟徐丹高振华齐旺顺周也张宏科秦书
Owner WANHUA CHEMICAL (NINGBO) CO LTD
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