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Method for preparing polyisocyanate curing agent based on IPDI (Isophorone Diisocyanate)

A polyisocyanate and isocyanate technology, applied in the direction of organic chemistry, etc., can solve the problems that the reaction process is not easy to control, the curing agent product cannot be obtained, and the activity of the quaternary ammonium base catalyst is high, and the effect of improving the storage stability is achieved.

Active Publication Date: 2018-03-23
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the experiment, it was found that even if the total chlorine content of the raw material is controlled, it is still impossible to obtain a curing agent product with a lower color number
[0010] Patent US4288586 proposes to use quaternary ammonium base instead of quaternary ammonium salt as a catalyst, which can effectively reduce the appearance of insoluble matter in the curing agent, thereby increasing the storage stability of the curing agent, but the catalyst activity of the quaternary ammonium base is high, and the reaction process is difficult to control
[0011] Patent US8373004 proposes a carbamate-based terminator, which can reduce the color number to a certain extent, but the storage stability of the product has not been significantly improved

Method used

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  • Method for preparing polyisocyanate curing agent based on IPDI (Isophorone Diisocyanate)
  • Method for preparing polyisocyanate curing agent based on IPDI (Isophorone Diisocyanate)
  • Method for preparing polyisocyanate curing agent based on IPDI (Isophorone Diisocyanate)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] 800 g of the treated IPDI was placed in a round bottom flask equipped with a reflux condenser, stirrer, thermometer and nitrogen inlet.

[0065] Heat the above reaction system to 70°C, then add the n-hexanol solution of 30wt% tetrabutylammonium hydroxide as a catalyst, and keep stirring, the temperature rises during the reaction, control the reaction temperature between 75-85°C, the -NCO of the reaction solution When the value reaches 23-24wt%, immediately add 40% of the catalyst mass in ammonia solution (measured by ammonia), heat up to 120° C. and continue stirring for 30 minutes to terminate.

[0066] Use a thin film evaporator at a temperature of 170°C and an absolute pressure of 100Pa to evaporate and remove the monomers in the trimerization reaction liquid to make the content less than 0.5wt%. The solid product obtained is dissolved in butyl acetate, and the solid composition Min content 70wt%.

Embodiment 2、3

[0068] The process conditions of Example 2-3 are the same as those of Example 1, except that the content of the nitrile compound in the isocyanate IPDI is different and the structure of the terminator is different. The corresponding product indicators are shown in Table 1.

[0069] The product index data of table 1 embodiment 1-3

[0070]

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Abstract

The invention relates to a method for preparing a polyisocyanate curing agent based on IPDI (Isophorone Diisocyanate). According to the method, the content of a nitrile compound in IPDI in a raw material is controlled to be less than 0.02wt%, meanwhile an ammonia solution or a micromolecule ammonia solution with at least one hydrogen atom is adopted as a terminator, a reaction liquid is subjectedto heating treatment, then the color number of a final curing agent product is less than 20hazen, and meanwhile the storage stability of the product is improved.

Description

technical field [0001] The present invention relates to a method for preparing IPDI-based polyisocyanate curing agents. Background technique [0002] Isocyanurate is a six-membered ring structure formed by trimerization of isocyanate monomers. The polyisocyanate with this structure has good thermal stability, especially the polyisocyanate curing agent for aliphatic or alicyclic isocyanate, which is a wide range of curing agent products in the field of coatings and adhesives. [0003] The color and storage stability of polyisocyanate curing agent products will affect the application range and service life of the product. For example, in the field of wood lacquer, for wood that requires light color, high-color polyisocyanate curing agent will not be popular, and good storage stability is more conducive to downstream applications and sales of products, thus preparing light-colored and good storage stability Polyisocyanate curing agent products are very necessary. [0004] Th...

Claims

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Application Information

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IPC IPC(8): C07D251/34C08G18/79
CPCC07D251/34C08G18/792
Inventor 刘伟尚永华石滨乔小飞李和甫李晶刘俊贤刘庆杨洗黎源华卫琦
Owner WANHUA CHEM GRP CO LTD
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