Diisocyanate prepolymer as curing agent and preparation method thereof

A technology of diisocyanate and isocyanate group is applied in the field of silane coupling agent modified diisocyanate prepolymer curing agent and its preparation, which can solve the problems of easy yellowing, aging, dependence on imports, etc.

Inactive Publication Date: 2011-07-20
周建明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] There are two types of diisocyanate curing agents: aromatic and aliphatic, each with different advantages and disadvantages. The price of aromatic is low, and it is the most used type in the polyurethane industry at present, because it has the advantages of high strength and fast curing at room temperature. , but there are disadvantages such as poor water resistance, easy yellowing and aging in the atmospheric environment; the price of aliphatic products is relatively high, and the raw materials mainly rely on imports, and are only used in products with higher performance requirements
The modified aromatic isocyanate prepolymer hydroxyl component can be realized by changing the structure of diol and introducing functional groups. There are few reports, especially about the modified 4,4'-diphenylmethane diisocyanate curing agent.

Method used

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  • Diisocyanate prepolymer as curing agent and preparation method thereof
  • Diisocyanate prepolymer as curing agent and preparation method thereof
  • Diisocyanate prepolymer as curing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Embodiment 1 (by method 1)

[0051] a. Add 200 grams of molten 4,4'-MDI and 60 grams of ethyl acetate into the reaction kettle, heat up to 65°C to dissolve and stir well, cool down to 35°C, add 42 grams of γ-mercaptopropyltrimethoxy Silane, react at 35-50°C for 2 hours, 50-70°C for 1 hour, and 70-80°C for 1 hour; b. Cool down to 45°C, add 9.5 grams of dehydrated 3-methyl-1,5-pentane Diol, react at 50-60°C for 2 hours, and react at 70-80°C for 2 hours; c. Cool down to 50°C, add dropwise a mixture of 18.9 grams of trimethylolpropane and 20 grams of ethyl acetate, drop for 1.5 hours Complete, react at 50-60°C for 2 hours, react at 70-80°C for 1 hour, react at 80-90°C for 1 hour, and cool down to 60°C; d, add 11 grams of butyl acetate and stir well to obtain 361 grams of solid content of 75% functional MDI curing agent with a viscosity of 4200mpa.s (25°C). The NCO content of the curing agent was detected to be 9% (12% based on total solids).

[0052] Note: 1. The detecti...

Embodiment 2

[0055] Embodiment 2 (by method 1)

[0056] a, add 200 grams of MDI-50 (that is, 4,2'-MDI weight is 50%, 4,4'-MDI weight is 50% mixture) and 40 grams of ethyl acetate in the reaction kettle, heat up to 60 ℃ Melt and stir evenly, cool down to 40°C, add 33 grams of γ-mercaptopropyltriethoxysilane, react at 40-50°C for 1 hour, 50-60°C for 2.5 hours, and 70-80°C for 1 hour; b , cool down to 45°C, add a mixed solution composed of 4 grams of neopentyl glycol and 5 grams of dipropylene glycol through dehydration, react at 50-60°C for 2 hours, and react at 70-80°C for 2 hours; c, cool down to 50°C , add a mixture of 22 grams of trimethylolpropane and 22 grams of ethyl acetate three times, react at 50-60°C for 2 hours, 70-80°C for 3 hours, 80-90°C for 1 hour, and cool down to 60 ℃; d, add 10 grams of butyl acetate and 16 grams of toluene, and stir evenly to obtain 352 grams of functional MDI curing agent with a solid content of 75% and a viscosity of 3500mpa.s (25°C).

Embodiment 3

[0057] Embodiment 3 (by method 1)

[0058] a. Add 200 grams of IPDI liquid and 40 grams of ethyl acetate into the reaction kettle, heat up to 60°C and stir evenly, cool down to 40°C, add 8 grams of γ-mercaptopropyltrimethoxysilane, and then add 0.1 grams of dilauric acid Dibutyltin, react at 40-50°C for 2 hours, 60-70°C for 1 hour, and 70-80°C for 1 hour; b, cool down to 50°C, add 13 grams of dehydrated ethyl hexanediol in two times, React at 50-60°C for 2 hours, 70-80°C for 1 hour, and 80-90°C for 1 hour; c. Cool down to 50°C, and add 26 grams of trimethylolethane and 30 grams of ethyl acetate three times to form The mixed solution was reacted at 50-60°C for 2 hours, at 70-80°C for 2.5 hours, at 80-90°C for 0.5 hours, and cooled to 60°C; d, adding 12 grams of propylene glycol monomethyl ether acetate, stirring evenly to obtain 329 grams of solid content is 75% and the viscosity is 3900mpa.s (25 ℃) functional type IPDI curing agent. The NCO content of the curing agent was de...

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Abstract

The invention relates to a diisocyanate prepolymer as a curing agent and a preparation method thereof. The preparation method comprises the following steps of: adding diisocyanate and an organic solvent in an agitated reactor, raising the temperature for dissolving, evenly stirring, adding polyfunctional siloxane and a catalyst, and reacting for 1-6h at 40-90 DEG C; adding dihydric alcohol and reacting for 1-6h at 50-100 DEG C; cooling to 50 DEG C, adding a mixed solution of polyalcohol and the organic solvent, reacting for 2-6h at 50-100 DEG C, and cooling to obtain the product. The invention discloses a method for a functional curing agent by adopting a siloxane-modified diisocyanate prepolymer containing active hydrogen or isocyanate group. The product prepared by adopting the preparation method disclosed by the invention has the advantages of increasing the dispersibility and the base material binding force on pigments and fillers, improving the performances of matched resin, such as weather resistance, high temperature resistance, hydrolysis resistance, and the like, and widening the application range of the aromatic isocyanate curing agent.

Description

technical field [0001] The invention relates to a functional polyurethane coating, an adhesive curing agent and a preparation method thereof, in particular to a silane coupling agent modified diisocyanate prepolymer curing agent and a preparation method thereof. Background technique [0002] There are two types of diisocyanate curing agents: aromatic and aliphatic, each with different advantages and disadvantages. The price of aromatic is low, and it is the most used type in the polyurethane industry at present, because it has the advantages of high strength and fast curing at room temperature. , but there are disadvantages such as poor water resistance, easy yellowing and aging in the atmospheric environment; the price of aliphatic products is relatively high, and the raw materials are mainly imported, and they are only used in products with higher performance requirements. In order to improve the insufficient performance of aromatic isocyanates, the research in this field ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/36C08G18/32C08G18/71C09J11/08C09J175/04
Inventor 周建明何绍群
Owner 周建明
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