Diisocyanate having fluorine-containing branched chain, preparation method and application thereof

A diisocyanate and side chain technology, applied in the application field of water-based fluorine-containing polyurethane, can solve the problems of slow reaction, poor reactivity, and limitation of practical application, and achieve the effect of mild reaction conditions

Inactive Publication Date: 2013-02-13
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, fluorine-containing diisocyanates are mainly fluorine-containing structures in the main chain of the molecule. Due to the electron-withdrawing effect of fluorine, the adjacent -NCO groups have poor reactivity, that is, low activity. Therefore, the water-based polyurethane prepared from it has low molecular weight and poor flexibility. , poor solu

Method used

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  • Diisocyanate having fluorine-containing branched chain, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A side chain fluorine-containing diisocyanate, calculated in parts by weight, its raw material composition and content are as follows:

[0043] 6 parts trimethylolpropane

[0044] Isophorone diisocyanate 100 parts

[0045] 2,2,2-Trifluoroethanol 5 parts

[0046] Catalyst 0.06 parts

[0047] Wherein said catalyst is stannous octoate.

[0048] The preparation method of the above-mentioned side chain fluorine-containing diisocyanate, the steps are as follows:

[0049] Stir and dehydrate 6 parts of trimethylolpropane at 110°C and a vacuum of 750mmHg for 0.5h, add 100 parts of isophorone diisocyanate and 0.03 parts of stannous octoate under nitrogen protection, react at 80°C for 2h, add 5 parts of 2 , 2,2-Trifluoroethanol and the remaining stannous octoate, continue to react at 80°C for 3h to obtain a light yellow viscous side chain fluorine-containing diisocyanate.

[0050] The side chain fluorine-containing diisocyanate of above-mentioned gained carries out infrared s...

Embodiment 2

[0077] A side chain fluorine-containing diisocyanate, calculated in parts by weight, its raw material composition and content are as follows:

[0078] Trimethylolpropane 10 parts

[0079] Isophorone diisocyanate 120 parts

[0080] 2,2,2-Trifluoroethanol 10 parts

[0081] Catalyst 1.8 parts

[0082] The catalyst described therein is a mixture of dibutyltin dilaurate and triethylamine in a mass ratio of 1:1.

[0083] The preparation method of the above-mentioned side chain fluorine-containing diisocyanate, the steps are as follows:

[0084] Stir and dehydrate 10 parts of trimethylolpropane at 110°C and a vacuum of 720mmHg for 1 hour, add 120 parts of isophorone diisocyanate and 0.9 parts of catalyst under nitrogen protection, react at 85°C for 2.5 hours, add 10 parts of 2,2 , 2-trifluoroethanol and the remaining catalyst, continue to react at 85°C for 2h, and obtain a water-white viscous side chain fluorine-containing diisocyanate.

[0085] A kind of aqueous fluorine-contai...

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Abstract

The invention discloses diisocyanate having fluorine-containing branched chain, a preparation method and application of diisocyanate having fluorine-containing branched chain in waterborn fluorine-containing polyurethane. The diisocyanate is prepared from (by weight parts) 6-10 parts of trimethylolpropane, 100-120 parts of isophorone diisocyanate, 5-20 parts of 2,2,2-trifluoroethanol and 0.06-1.8 parts of catalyst by stirring trimethylolpropane at 100-120 DEG C under vacuum for dehydration, adding isophorone diisocyanate and 0.03-0.9 parts of catalyst under the protection of nitrogen, reacting at 80-85 DEG C for 2-3 h, adding 2,2,2-trifluoroethanol and the rest of catalyst, and further reacting at 80-85 DEG C for 2-3 h. The diisocyanate is used for preparing waterborn fluorine-containing polyurethane, and the obtained waterborn fluorine-containing polyurethane has flexibility, elasticity, and good tensile strength, elongation at break, and contact angle with water.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a side chain fluorine-containing diisocyanate, a preparation method thereof and an application in water-based fluorine-containing polyurethane. Background technique [0002] Due to its low surface energy, excellent chemical stability, heat resistance, pollution resistance and atmospheric aging resistance, fluorine-containing polyurethane has become an excellent coating film-forming material. Coatings are widely used. [0003] At present, fluorine-containing diisocyanates are mainly fluorine-containing structures in the main chain of the molecule. Due to the electron-withdrawing effect of fluorine, the adjacent -NCO groups have poor reactivity, that is, low activity. Therefore, the water-based polyurethane prepared from it has low molecular weight and poor flexibility. , poor solubility, and high brittleness, thus greatly limiting their practical application...

Claims

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Application Information

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IPC IPC(8): C08G18/78C08G18/66C08G18/48
Inventor 张英强李烨吴蓁徐耀民纪开强黄舒晗郑星月陈丽罗远母小刚
Owner SHANGHAI INST OF TECH
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