Functional color reducing agent, and method for stabilizing color number of diisocyanate product

A technology of diisocyanate and toluene diisocyanate, which is used in the purification/separation of isocyanate derivatives, organic chemistry, etc., can solve the problems of increased color number, yellow-green color, and high color number

Active Publication Date: 2020-03-13
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By adding this antioxidant, the main problem to be solved is that the unsaturated bond of the benzene ring in the structure of diphenylmethane diisocyanate is subjected to thermal oxygen aging and free radical oxidation, resulting in a high color number
[0019] In short, at present, through innovative technical means, diisocyanate products with low color number can be produced, but none of the existing patents or technologies can solve the following needs: diisocyanate products that have been frozen and crystallized at -30°C to 5°C can be melted again After that, the color number will increase significantly and appear yellow-green

Method used

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  • Functional color reducing agent, and method for stabilizing color number of diisocyanate product
  • Functional color reducing agent, and method for stabilizing color number of diisocyanate product
  • Functional color reducing agent, and method for stabilizing color number of diisocyanate product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] The method for the color number of stable diisocyanate product, comprises the steps:

[0079] (1) Prepare a closed galvanized barrel (volume of 210L) filled with toluene diisocyanate TDI-80 industrial products. After testing, the APHA color number of TDI-80 industrial products is 7#;

[0080] (2) Preparation of 4,4'-bis-(2,3,3-trimethyl-1-butenyl)diphenylamine and bis(1,2,2,6,6-pentamethyl-4-piper The mixture of pyridyl) sebacate, the mass ratio of the two in the mixture is 2:1, and the mixture is stirred and mixed for 30 minutes according to the rotating speed of 200 rev / min, and the functional color reducing agent is prepared. The obtained functional color reducer has a viscosity of 1325 Pa·s (at 25° C.).

[0081] (3) Add the above-mentioned functional color reducer to the closed galvanized barrel that is equipped with toluene diisocyanate TDI-80 industrialized product, the addition of the functional color reducer is 0.0300% of TDI-80 quality %; After shaking with a...

Embodiment 2

[0085] The method for the color number of stable diisocyanate product, comprises the steps:

[0086] (1) Prepare a closed galvanized barrel (volume 210L) filled with toluene diisocyanate TDI-80 industrial products. After testing, the APHA color number of TDI-80 industrial products is 5#;

[0087] (2) Preparation of 4,4'-di(phenylisopropyl)diphenylamine and N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexyl The mixture of diamines, the mass ratio of the two in the mixture is 4:1, is stirred and mixed at a speed of 200 rpm for 30 minutes, and a functional color reducer is prepared. The obtained functional color reducer has a viscosity of 1200 Pa·s (at 25° C.).

[0088] (3) Add the above-mentioned functional type color reducer to the closed galvanized barrel that is equipped with toluene diisocyanate TDI-80 industrialized product, the addition of the functional type color reducer is 0.0200% of TDI-80 quality %; after shaking with a bucket shaker, store it in a -30°C...

Embodiment 3

[0092] The method for the color number of stable diisocyanate product, comprises the steps:

[0093] (1) Prepare a closed galvanized barrel (volume 210L) filled with diphenylmethane diisocyanate MDI-50 industrialized product. After testing, the APHA color number of MDI-50 industrialized product is 9#;

[0094] (2) Preparation of a mixture of 4,4'-di(phenylisopropyl)diphenylamine and bis(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate, the mixture The mass ratio of the two is 2.5:1, and the mixture is stirred and mixed for 30 minutes at a speed of 200 rpm to prepare a functional color reducer. The obtained functional color reducer has a viscosity of 1287 Pa·s (at 25° C.).

[0095] (3) Add the above-mentioned functional type color reducer prepared to the closed galvanized barrel that diphenylmethane diisocyanate MDI-50 industrialized product is housed, the addition of functional type color reducer is MDI-50 0.0250% by mass; after shaking with a bucket shaker, store in a -10°C fr...

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Abstract

The invention belongs to the technical field of diisocyanate production, and particularly relates to a functional color reducing agent, and a method for stabilizing the color number of a diisocyanateproduct. The functional color reducing agent comprises: (a) a hindered amine substance, and (b) a hindered phenol substance and / or an ester substance. The method for stabilizing the color number of the diisocyanate product comprises the following steps: mixing the functional color reducing agent with diisocyanate, carrying out freezing crystallization, and redissolving obtained crystals to obtaina liquid in order to obtain the diisocyanate product with a stable APHA color number. The method can avoid yellow-green salt substances from being generated in the freezing crystallization and redissolving process of the diisocyanate product, achieves the color number stability of the diisocyanate product, and keeps the low color number of the product after freezing crystallization and redissolving.

Description

technical field [0001] The invention belongs to the technical field of diisocyanate production, and in particular relates to a functional color reducing agent and a method for stabilizing the color number of diisocyanate products. Background technique [0002] Diisocyanate is usually prepared from amine as raw material, after condensation to prepare polyamine, and then phosgenation reaction. Therefore, the obtained diisocyanates basically contain acid chlorides and urea impurities. Studies have shown that during the process of low-temperature freezing and crystallization of diisocyanate products, due to changes in the temperature field, the impurities contained in acid chlorides and urea will gradually migrate to the core of the packaging barrel through the pores of the crystal and accumulate; When the temperature rises, acid chlorides and urea substances will irreversibly combine with each other to form salts, causing the diisocyanate crystals at the barrel core to appear ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C263/18C07C263/20C07C265/14
CPCC07C263/18C07C263/20C07C265/14
Inventor 金振宇王树宾张坤张宏科
Owner WANHUA CHEM GRP CO LTD
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