Prepolymer based on diphenylmethane diisocyanate as polyurethane coating curing agent and preparation method thereof

A technology of diisocyanate and diphenylmethane, applied in the field of prepolymer based on diphenylmethane diisocyanate as polyurethane coating curing agent and its preparation, can solve the poor compatibility of hydroxyl acrylic resin and alkyd resin , Acetate solution has poor storage stability and low functionality, and achieves the effect of clear and transparent appearance, low color and low toxicity of the product

Active Publication Date: 2016-08-10
GUANGDONG HUARUN PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Diphenylmethane diisocyanate is not suitable as a polyurethane coating curing agent directly due to its low functionality, poor storage stability of its acetate solution, and poor compatibility with hydroxyl acrylic resins and alkyd resins.
We synthesized the curing agent according to the methods provided by the Chinese Patent Document No. CN1116327C and CN1116328C, and tested the construction life after mixing with the alkyd resin. Among them, the alkyd resin was taken as an example of AP572 from Italy SAPICI Company, which is currently recognized in the industry as having better quality. The construction life is 1 hour and 70 minutes at 25°C, and the construction life is 30 minutes and 35 minutes at 30°C. The construction life is tested after mixing with hydroxy acrylic resin. Among them, hydroxy acrylic resin is the best quality recognized in the industry at present. Germany's Bayer Taking A 450BA / X as an example, the construction life is 40 minutes and 50 minutes at 25°C, and 15 minutes and 25 minutes at 30°C; however, the construction life of two-component polyurethane coatings is usually required to be more than 1 hour. It is best to be longer than 2 hours. This construction life mainly comes from the summary of specific construction practices. For example, in the sixth line of the second natural paragraph on page 109 of "Spray Polyurea Elastomer Technology" edited by Huang Weiwei, it was mentioned that "through different Substituent group", the spraying material mixed with polyaspartic acid ester and HDI trimer "The construction life can be extended from 5min to more than 2h", and in the second line of the first natural paragraph, it is mentioned that before the construction life is extended "There is still a certain gap from the ideal construction time that people expect"

Method used

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  • Prepolymer based on diphenylmethane diisocyanate as polyurethane coating curing agent and preparation method thereof
  • Prepolymer based on diphenylmethane diisocyanate as polyurethane coating curing agent and preparation method thereof
  • Prepolymer based on diphenylmethane diisocyanate as polyurethane coating curing agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0038] 26.8kg of 1,1,1-trimethylolpropane and 26.8kg of dipropylene glycol were vacuum dehydrated at 105°C to 115°C for 2 to 4 hours before use.

[0039] At this moment, the equivalent ratio of 1,1,1-trimethylolpropane and dipropylene glycol is 6:4,

[0040] Keep its moisture content below 0.04%. Under nitrogen protection, put 262.5kg of diphenylmethane diisocyanate and 316.1kg of butyl acetate into the reaction vessel and stir evenly, maintaining the temperature at 60°C.

[0041] Then slowly add 1,1,1-trimethylolpropane dropwise into the reactor, and keep stirring in the reactor during the dropwise addition to make the materials mix and react evenly, and the dropping time is 90 minutes. Continue to react at 60°C under stirring for 4 hours; then slowly add dipropylene glycol dropwise into the reactor, and keep stirring in the reactor during the dropwise addition to make the materials mix and react evenly, and the dropping time is 2 hours. After the dropwise addition, the rea...

no. 2 example

[0051] 24kg of 1,1,1-trimethylolethane and 38.4kg of tripropylene glycol were vacuum dehydrated at 105°C to 115°C for 2 to 4 hours before use.

[0052] At this moment, the equivalent ratio of 1,1,1-trimethylolethane and tripropylene glycol is 6:4,

[0053] Keep its moisture content below 0.04%. Under nitrogen protection, put 262.5kg of diphenylmethane diisocyanate and 216.6kg of butyl acetate into the reaction vessel and stir evenly, maintaining the temperature at 60°C.

[0054] Then slowly add 1,1,1-trimethylolethane dropwise into the reactor, and keep stirring in the reactor during the dropwise addition to make the materials mix and react evenly, the dropwise time is 90 minutes, and the dropwise addition is completed Then continue to react at 60°C under stirring for 4 hours, then slowly add tripropylene glycol dropwise into the reactor, keep stirring in the reactor during the dropping process to make the materials mix and react evenly, and the dropping time is 2 hours Afte...

no. 3 example

[0064] 26.8kg of 1,1,1-trimethylolpropane and 26.8kg of dipropylene glycol were vacuum dehydrated at 105°C to 115°C for 2 to 4 hours respectively to ensure that the water content was lower than 0.04%. Under the protection of nitrogen, put 262.5kg of diphenylmethane diisocyanate and 316.1kg of butyl acetate into the reaction vessel, mix and stir evenly, and keep the temperature at 60°C, then add 1,1,1-trimethylol After the propane and dipropylene glycol are fully mixed, slowly drop them into the reactor. During the dropping process, the reactor is kept stirring to make the material uniform. The dropping time is 90 minutes. After the dropping, continue to stir at 60°C React for 4 hours, cool down to below 40°C and discharge.

[0065] The curing agent prepared in the third example becomes turbid after being stored at 25° C. for 5 days, and separates after 10 days.

[0066] In this embodiment, in the preparation of the curing agent for polyurethane coatings, the dripping method of ...

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Abstract

The present invention relates to a prepolymer based on diphenylmethane diisocyanate as a polyurethane coating curing agent and a preparation method thereof, the prepolymer comprising (a) obtained from excess diphenylmethane diisocyanate and a compound having a molecular weight of less than 200 A reaction product (a) of a primary trihydric alcohol; and (b) a reaction product (b) obtained from an excess of diphenylmethane diisocyanate and a dihydric secondary alcohol having a molecular weight of less than 200, wherein the reaction product (a) is combined with The molar ratio of the reaction product (b) is in the range of 4 / 9 to 8 / 3:1, and wherein, the diphenylmethane diisocyanate relative to the total weight of the diphenylmethane diisocyanate comprises : 40% to 100% 4,4'-diphenylmethane diisocyanate; 0% to 55% 4,2'-diphenylmethane diisocyanate; and 0% to 5% 2,2'-diisocyanate Phenylmethane diisocyanate.

Description

[0001] This application is an application date of December 17, 2008, the application number is 200810029535.6, and the title of the invention is "prepolymer based on diphenylmethane diisocyanate and its preparation method as polyurethane coating curing agent". case application. technical field [0002] The invention relates to a prepolymer based on diphenylmethane diisocyanate as a polyurethane coating curing agent and a preparation method thereof. Background technique [0003] At present, the most commonly used production method of polyurethane coating curing agent in China is to use trimethylolpropane and toluene diisocyanate to react to form a prepolymer. In the process of prepolymer production, unreacted toluene diisocyanate remains. Due to the relatively high vapor pressure of monomer toluene diisocyanate, 2,4-toluene diisocyanate is 1.3*10 at 20°C -2 mbar; 2,6-toluene diisocyanate at 20°C is 1.3*10 -2 mbar, and toluene diisocyanate vapor is highly toxic and must be r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/78C08G18/32C09D175/04C09D7/12
Inventor 温晋嵩曾光明王庆生孔淑香刘超刘晓燕李景宏马红肖
Owner GUANGDONG HUARUN PAINT CO LTD
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