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Dicyclohexylmethylmethane-4,4'-diisocyanate prepolymer used for paint curing agent and preparation method thereof

A technology of dicyclohexylmethane and diisocyanate, applied in coating and other directions, can solve the problems of inability to cure with natural varnish coating, harsh reaction conditions, yellowing of products, etc. control, excellent performance

Active Publication Date: 2009-08-26
WANHUA CHEMICAL (NINGBO) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Secondly, because TDI curing agent contains benzene ring, it is very easy to cause yellowing of the product, and the color will gradually turn yellow and eventually turn brown with the passage of time. Therefore, general TDI curing agents cannot be used for coating curing of natural color varnishes.
[0011] Chinese patent CN101230124A introduces a curing agent 4,4'-diphenylmethane diisocyanate prepolymer and its preparation method. The reaction conditions of this method are relatively harsh, and because it contains a benzene ring, it is very easy to cause yellowing of the product, and the color changes with time. Turns yellow with time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] 11.8 g of DL1000P, 62 g of CMA-44-600, and 16.2 g of 1,4-butanediol (BDO) were dissolved in 90 g of ethyl acetate, and vacuum dehydrated at 65°C for 2 hours. Add 203 g of H to the reactor 12 MDI-100, heat up to 90°C. Add the above polyol composition solution dropwise into the reaction kettle while stirring, control the temperature of the reaction system to be 90±3° C., and complete the dropwise addition of the solution within 1 hour. After the polyol composition was added dropwise, the temperature of the reaction system was kept at 90±3° C., and the reaction was continued for 10 hours. Lower the temperature to 25°C and add 54 g of ethyl acetate to obtain H2O with a solid content of 67% and an NCO content of 8.5%. 12 MDI curing agent.

Embodiment 2

[0064] Dissolve 11.8 g of DL1000P, 62 g of CMA-44-600, and 16.2 g of 1,4-butanediol (BDO) in 90 g of ethyl acetate, add 0.14 g of T12, and vacuum dehydrate at 65°C for 2 hours. Add 203 g of H to the reactor 12 MDI-100, heat up to 40°C. The above polyol composition solution was added dropwise into the reactor while stirring, the temperature of the reaction system was controlled to be 40±3°C, and the solution was added dropwise within 1 hour. After the polyol composition is added dropwise, the temperature of the reaction system is kept at 40±3° C., and the reaction is continued for 1 hour. Lower the temperature to 25° C., add 54 g of ethyl acetate to obtain H2O with a solid content of 67% and an NCO content of 8.3%. 12 MDI curing agent.

Embodiment 3

[0066] Dissolve 11.8 g of DL1000P, 62 g of CMA-44-600, and 16.2 g of 1,4-butanediol (BDO) in 90 g of ethyl acetate, add 0.38 g of T12, and vacuum dehydrate at 65°C for 2 hours. Add 203 g of H to the reactor 12 MDI-100, heat up to 30°C. Add the above polyol composition solution dropwise into the reaction kettle while stirring, control the temperature of the reaction system to be 30±3° C., and complete the dropwise addition of the solution within 1 hour. After the polyol composition is added dropwise, the temperature of the reaction system is kept at 30±3° C., and the reaction is continued for 1 hour. Lower the temperature to 25°C and add 54 g of ethyl acetate to obtain H2O with a solid content of 67% and an NCO content of 7.8%. 12 MDI curing agent.

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Abstract

The invention discloses dicyclohexylmethylmethane-4,4'-diisocyanate prepolymer used for paint curing agent and preparation method thereof, the prepolymer is mainly prepared from (A) 20-50 mass parts of dicyclohexylmethylmethane-4,4'-diisocyanate; (B) 5-60 mass parts of polyalcohol composition; (C) 30-300 mass parts of organic solvent with boiling point less than 200 DEG C; and selective (D) 0.01-1 mass part of organic metal catalyst; and the prepolymer is used for curing agent for alkyd resin paint and has better weathering resistance, yellowing resistance, chemicals resistance and water resistance.

Description

technical field [0001] The invention relates to an isocyanate prepolymer which can be used as a coating curing agent and a preparation method thereof, in particular to a dicyclohexylmethane diisocyanate prepolymer and a preparation method thereof. Background technique [0002] Dicyclohexylmethane diisocyanate, 1,6-hexamethylene diisocyanate, and isophorone diisocyanate are non-yellowing aliphatic diisocyanates, which are often used in high-performance polyurethane coatings, adhesives, etc. The polyurethane resin made of them has weather resistance Excellent, no yellowing phenomenon will occur under outdoor ultraviolet light irradiation, and no chemical reaction of aromatic isocyanate into carcinogenic aromatic amine will occur under high temperature cooking conditions. Aliphatic isocyanate has a good application in the high-end application field of polyurethane. [0003] Aliphatic isocyanates are mainly used in coatings, especially curing agents for coatings. However, ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D7/12C08G18/12C08G18/66C08G18/75
Inventor 黄岐善王洪武闫泽群张红华卫琦
Owner WANHUA CHEMICAL (NINGBO) CO LTD
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