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A kind of method for preparing biuret polyisocyanate

A technology of diisocyanate and polyisocyanate, which is applied in the preparation of urea derivatives, chemical instruments and methods, and the preparation of organic compounds. The effect of solving blockage, long-term stable operation, and inhibiting polyurea solid precipitation

Active Publication Date: 2019-09-03
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to make up for the deficiencies of the prior art, to provide a method for preparing biuret polyisocyanate, to strengthen the instantaneous dispersion of water vapor at the outlet of the insertion tube, to solve the problem of plugging of the insertion tube, and to suppress the formation of polyurea insolubles. Generated and prepared products are clear and bright without whitish, low turbidity

Method used

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  • A kind of method for preparing biuret polyisocyanate
  • A kind of method for preparing biuret polyisocyanate
  • A kind of method for preparing biuret polyisocyanate

Examples

Experimental program
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Effect test

Embodiment 1

[0036] 1) Under nitrogen protection, such as figure 1 As shown, 4000Kg hexamethylene diisocyanate and 0.4Kg (100ppm) diisooctyl phosphate are added to the reactor through the diisocyanate and catalyst inlet 2, heated to 100°C through the heating jacket 6, and then passed through the steam Insertion pipe 7 gradually feeds 33Kg of water vapor (total amount of water vapor) with a flow rate of 0.4Kg / min, and reacts by stirring paddle 5;

[0037] 2) Turn on the ultrasonic tube generator 4 within 20-100 minutes after the reaction starts, the frequency of the ultrasonic tube generator 4 is 25KHz, the insertion depth of the water vapor insertion tube 7 is 40cm, and the ton power of the ultrasonic tube generator 4 is 1000W , after the water vapor is introduced, continue to stir and react for 140 minutes to obtain the biuret reaction liquid and discharge it through the liquid discharge port 3, and the reaction tail gas is discharged through the reaction tail gas outlet 1;

[0038] 3) T...

Embodiment 4

[0046] 1) Under nitrogen protection, such as figure 1 As shown, 4000Kg hexamethylene diisocyanate and 32Kg (8000ppm) diisooctyl phosphate are added to the reactor through diisocyanate and catalyst inlet 2, heated to 180°C through heating jacket 6, and then heated at 0.6Kg / The flow rate of min gradually feeds 107Kg of water vapor, and stirs the reaction through the stirring paddle 5;

[0047] 2) Turn on the ultrasonic tube generator 4 within 40-160 minutes after the reaction starts, the frequency of the ultrasonic tube generator 4 is 30KHz, the insertion depth of the water vapor insertion tube 7 is 50cm, and the ton power of the ultrasonic tube generator 4 is 875W , after the water vapor is introduced, continue to stir and react for 50 minutes to obtain the biuret reaction liquid, which is discharged through the liquid discharge port 3, and the reaction tail gas is discharged through the reaction tail gas outlet 1;

[0048] 3) The biuret reaction solution obtained in step (2)...

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Abstract

The invention relates to a method for preparing biuret polyisocyanate. Biuret polyisocyanate is prepared by reacting water vapor with diisocyanate. At a specific stage of the reaction, water vapor is dispersed through an ultrasonic tube generator of a specific size near the insertion tube to suppress The generation of polyurea precipitation is avoided, and the blockage of the water vapor insertion tube is fundamentally avoided. The prepared product is clear and bright without whitishness, and the turbidity is less than 0.5NTU.

Description

technical field [0001] The invention relates to a method for preparing biuret polyisocyanate, in particular to a method for preparing biuret polyisocyanate with low turbidity, no polyurea insolubles, and no clogging of a water vapor insertion tube. Background technique [0002] Aliphatic or cycloaliphatic biuret polyisocyanate is widely used in the coating industry, adhesives, inks and other fields due to its excellent weather resistance, mechanical properties and chemical properties. Biuret polyisocyanate can be prepared by reacting polyisocyanate with water, amine or reagents that can generate water in situ (such as tert-butanol, hydrogen sulfide, formic acid, etc.), and the obtained product is a mixture with a certain molecular weight distribution. Since Bayer's patent DE1101394 disclosed the preparation method of biuret polyisocyanate in 1958, its synthesis process has been continuously developed and improved, but there are still some obvious problems in the production p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/30C08G18/08C07C273/18C07C275/62
Inventor 王彪尚永华石滨孙中平乔小飞温志浩华卫琦姜庆梅
Owner WANHUA CHEM GRP CO LTD