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Preparation method of aliphatic diisocyanate tripolymer curing agent

A technology of isocyanate trimerization and diisocyanate, which is applied in the field of polyurethane curing agent preparation, can solve the problems of unsuitable surface paint, increased product viscosity, long reaction time, etc., to avoid the increase of chromaticity, uniform molecular weight distribution and stable gloss. Effect

Inactive Publication Date: 2016-05-11
QINGDAO UNIV OF SCI & TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the viscosity of the product prepared by this catalyst is high, and with the decrease of NCO content, the viscosity of the product rises rapidly
In addition, when the catalyst catalyzes trimeric hexamethylene diisocyanate, the product produced has turbidity and is not suitable for surface paints
And the reaction time is longer, about 24h

Method used

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  • Preparation method of aliphatic diisocyanate tripolymer curing agent
  • Preparation method of aliphatic diisocyanate tripolymer curing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Add 1000g of HDI to the stirred reactor 1, stir, ventilate with nitrogen, heat and control the temperature at 65°C, and add octanoic acid tetramethylammonium salt catalyst from the opening of reactor 1 three times within 1 hour after the temperature is stabilized. The total amount is 0.1% of the mass of the aliphatic diisocyanate monomer. From the beginning of adding the catalyst, samples are taken every 1 hour to measure the mass percentage of free monomers and NCO groups in the reaction system. The NCO groups in the reaction system to be measured When the mass percent composition of group is 40%, add the benzoyl chloride terminator of aliphatic diisocyanate monomer quality 0.1% from the opening of reactor 1 to terminate the reaction, and send into filter 3 by discharge pump 2 after the insulation 1h Enter the mixed material storage tank 4 after filtering out most of the solid particles.

[0037]The prepolymer in the mixed material storage tank 4 enters the short-path ...

Embodiment 2

[0039] Add 1000g of HDI to the reactor 1 with stirring, stir, blow nitrogen, heat and control the temperature at 65°C, and add tetramethylammonium lactate catalyst from the opening of reactor 1 three times within 1 hour after the temperature stabilizes. The total amount is 0.1% of the mass of the aliphatic diisocyanate monomer. From the beginning of adding the catalyst, samples are taken every 1 hour to measure the mass percentage of free monomers and NCO groups in the reaction system. The NCO groups in the reaction system to be measured When the mass percent composition of group is 40%, add the benzoyl chloride terminator of aliphatic diisocyanate monomer quality 0.1% from the opening of reactor 1 to terminate the reaction, and send into filter 3 by discharge pump 2 after the insulation 1h Enter the mixed material storage tank 4 after filtering out most of the solid particles.

[0040] The prepolymer in the mixed material storage tank 4 enters the short-path evaporator 6 thro...

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Abstract

The invention discloses a preparation method of an aliphatic diisocyanate tripolymer curing agent. The preparation method is characterized by comprising the following steps of adding aliphatic diisocyanate monomers into a reactor under the protection of inert gas; adding homemade trimerization catalysts for performing self-polymerization to generate aliphatic diisocyanate tripolymers; adding terminating agents to terminate the reaction after the proper conversion rate is reached; filtering and collecting clear filtering liquid to be used as raw products; using a short-process evaporator to perform twice separation on the crude product; recovering and reusing unreacted free monomers, wherein the content of the free monomers in the separated aliphatic diisocyanate tripolymers is reduced to be lower than 0.4 percent. The aliphatic diisocyanate tripolymers prepared by the preparation method can be prepared into super fast-drying paint; good anti-yellowing performance is realized; the aliphatic diisocyanate tripolymers can be widely applied to high-grade paint.

Description

technical field [0001] The invention relates to a preparation method of a non-yellowing polyurethane curing agent, in particular to a preparation method of an aliphatic diisocyanate trimer curing agent. Background technique [0002] Polyurethane has excellent physical and mechanical properties and chemical resistance stability, and is widely used in various fields. As the main raw material of polyurethane, the biggest advantage of aliphatic isocyanate over aromatic isocyanate is that the synthesized aliphatic isocyanate trimer has no active hydrogen atoms in the structure and will not form intramolecular or intermolecular hydrogen bonds, so the viscosity of the product is low. , and has good corrosion resistance and anti-yellowing performance, and can be used in high-grade coatings. [0003] Hexamethylene diisocyanate is a typical aliphatic isocyanate for application. It has low vapor pressure, high volatility, and high toxicity during construction. It cannot be directly us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D251/34C08G18/79C09D175/04
CPCC09D175/04C07D251/34C08G18/792
Inventor 杨霞魏其凡郑世清徐进付振波
Owner QINGDAO UNIV OF SCI & TECH
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