Process for preparing modified polyisocyanate

A polyisocyanate, modified technology, applied in the direction of organic chemistry, can solve the problems of unsatisfactory, no description of adsorbent details, low content of silicic anhydride, etc., to shorten the thermal history, save adsorption time, and excellent adsorption capacity Effect

Inactive Publication Date: 2009-10-07
BAYER MATERIALSCIENCE AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This publication discloses the use of diatomaceous earth, adsorbed carbon and metal oxides as adsorbents, but does not describe the details of the various adsorbents
Although the literature states that diatomaceous earth is the preferred adsorbent, the material contains relatively low amounts of silicic anhydride, which adsorbs well
In addition, the sorbent may contain a high amount of moisture, therefore, there may be problems in controlling the reaction between the organic isocyanate and the moisture of the sorbent
Therefore, the use of this adsorbent is not satisfactory

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] Production of polyisocyanates containing CD and / or UI groups

[0082] (1) To 1,000 parts of 4,4'-MDI (NCO content 33.6%), add 3.5ppm 1-methylphosphole-1-oxide (30% toluene solution, effective catalyst amount 1.05ppm) As a catalyst for the carbodiimidization reaction, the obtained mixture was heated at 80° C. for about 6 hours to perform a carbodiimidization reaction. After cooling the resulting CD-modified polyisocyanate to 60° C., the concentration of isocyanate groups (NCO content) was 29.6% (degree of carbodiimidization 11%).

[0083] (2) Immediately add 0.05% silica particles (purity is 85%, specific surface area is 650 m 2 / gram, oil adsorption value is 350 milliliters / 100 grams, average particle diameter is 4.5 micron) as adsorbent, its amount is 476 times of the amount of 1-methylphosphole-1-oxide, under stirring NCO content was measured approximately every 30 minutes. After 1 hour the NCO content was found to be 29.6%, so little change in the NCO content wa...

Embodiment 2

[0088] Production of modified polyisocyanates containing CD groups and / or UI groups

[0089] (1) Example 1 was repeated except that the heating time was changed to about 5.1 hours. After cooling to 60°, the CD-modified polyisocyanate has an NCO content of 29.6% (degree of carbodiimidization 11%).

[0090] (2) Immediately add 0.01% silica particles (purity is 85%, specific surface area is 650 m 2 / gram, the oil adsorption value is 350 milliliters / 100 grams, and the average particle diameter is 4.5 microns) as adsorbent, and its amount is 95 times of the amount of 1-methylphosphole-1-oxide. The NCO content of the CD-modified polyisocyanate was measured every about 30 minutes under stirring. After 1 hour the NCO content was found to remain at 29.4%, so little drop in NCO content was observed. Then, continue to stir for about 4 hours for verification, and detect the NCO content. It was found that the NCO content was 29.1%, which hardly decreased.

[0091] (3) The silica pa...

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Abstract

A process for preparing a liquid organic isocyanate having a carbodiimide group and / or an uretonimine group, excellent in storage stability. In a process for preparing a modified polyisocyanate by carbodiimidizing an organic polyisocyanate in the presence of a phospholine-based catalyst, silicon dioxide particles having a specific surface area of at least 400 m / g and an oil absorption of at least 180 ml / 100 g are used to adsorb and inactivate the catalyst to thereby terminate the carbodiimidization reaction.

Description

technical field [0001] The present invention relates to a process for the preparation of modified polyisocyanates by carbodiimidization of organic polyisocyanates in the presence of phospholine-based catalysts. Background of the invention [0002] Heretofore, isocyanate groups of organic polyisocyanates are converted into carbodiimide groups (hereinafter referred to as "CD") by heating the organic polyisocyanate at a high temperature. In order to prevent the polymerization of organic polyisocyanates at such high temperatures and to reduce the energy consumed in the above-mentioned carbodiimidization, it has been proposed to use catalysts that promote carbodiimidization at lower temperatures. Particularly preferred are phospholene-based catalysts, especially phospholene-based catalysts, because such catalysts exhibit high catalytic activity even at mild temperature conditions, and can initiate and accelerate carbon dioxide Imination reactions, such substances are disclosed i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/79C07C267/00
CPCC08G18/025C08G18/10C08G18/797C07C267/00C08G18/79C08G18/72C08K3/24
Inventor 上山信宏福场智明真野卓志
Owner BAYER MATERIALSCIENCE AG
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