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A kind of polycarboxylate photocatalytic self-cleaning waterborne polyurethane coating and its preparation and application

A water-based polyurethane, polycarboxylate technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve problems such as poor cleaning effect of polyurethane coatings

Active Publication Date: 2021-07-02
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a polycarboxylate photocatalyzed self-cleaning waterborne polyurethane coating and its preparation and application, which solves the defect of poor self-cleaning effect of polyurethane coatings in the prior art

Method used

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  • A kind of polycarboxylate photocatalytic self-cleaning waterborne polyurethane coating and its preparation and application
  • A kind of polycarboxylate photocatalytic self-cleaning waterborne polyurethane coating and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) polybutylene adipate diol of 20 weight parts, 2 weight parts of photoactive polybenzophenone polycarboxylate polyols (PEG-BPTCD), 10 weight parts of isophorone Diisocyanate and 0.1 parts by weight of stannous octoate were reacted at 80° C. for 2 hours to obtain a waterborne polyurethane prepolymer;

[0031] Wherein, polybenzophenone polycarboxylate polyol (PEG-BPTCD) is prepared by reacting BPTCD and PEG (Mw: 2000) at a molar ratio of 1.0:1.1 at 105° C. for 2 hours. No solvent is added during the reaction.

[0032] (2) Add 3 parts by weight of N-methylpyrrolidone and 3 parts by weight of 2,2'-dimethylolpropionic acid to the polyurethane prepolymer obtained in step (1), react at 70°C for 2 hours and then add 1 part by weight of 1,4-butanediol, continue to react at 70°C for 2 hours;

[0033] (3) Add 10 parts by weight of acetone and 2 parts by weight of triethylamine to the above system, and carry out neutralization reaction at 30°C for 1 hour; after neutralization,...

Embodiment 2

[0036] (1) 30 parts by weight of polycarbonate diol, 2 parts by weight of photoactive polybenzophenone polycarboxylate polyol (PEG-BPTCD), 10 parts by weight of hexamethylene diisocyanate, and 0.2 parts by weight of dibutyltin dilaurate were reacted at 80° C. for 2 hours to obtain a waterborne polyurethane prepolymer;

[0037] Wherein, polybenzophenone polycarboxylate polyol (PEG-BPTCD) is prepared by reacting BPTCD and PEG (Mw: 2000) at a molar ratio of 1.0:1.5 at 110° C. for 2 hours. No solvent is added during the reaction.

[0038] (2) Add 2 parts by weight of N-methylpyrrolidone and 2 parts by weight of 2,2'-dimethylolpropionic acid to the polyurethane prepolymer obtained in step (1), react at 70°C for 3 hours and add 1 part by weight of 1,6-hexanediol, continue to react at 75°C for 3 hours;

[0039] (3) Add 5 parts by weight of methyl ethyl ketone and 2 parts by weight of triethylamine to the above system, and carry out neutralization reaction at room temperature for 2 ...

Embodiment 3

[0041] (1) 40 parts by weight of polycaprolactone diol, 5 parts by weight of photoactive polybenzophenone polycarboxylate polyol (PEG-BPTCD), 10 parts by weight of toluene diisocyanate and 0.2 parts by weight of The bismuth neodecanoate catalyst was reacted at 85° C. for 4 hours to obtain a waterborne polyurethane prepolymer;

[0042] Among them, polybenzophenone polycarboxylate polyol (PEG-BPTCD) is prepared by reacting BPTCD and PEG (Mw: 2000) at a molar ratio of 1.0:2.0 at 110° C. for 2 hours. No solvent is added during the reaction.

[0043] (2) Add 5 parts by weight of N-methylpyrrolidone and 2 parts by weight of 2,2'-dimethylolpropionic acid to the polyurethane prepolymer obtained in step (1), react at 80°C for 2 hours and add 2 parts by weight of diethylene glycol, continue to react for 3 hours at 75°C;

[0044] (3) Add 10 parts by weight of methyl ethyl ketone and 3 parts by weight of triethylamine to the above system, and carry out neutralization reaction at 30°C fo...

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Abstract

The invention relates to a polycarboxylate photocatalyzed self-cleaning waterborne polyurethane coating and its preparation and application. The preparation method comprises: reacting macromolecular polyglycol, polybenzophenone polycarboxylate polyol, diisocyanate and a catalyst to obtain a waterborne polyurethane prepolymer; adding a solvent and a hydrophilic chain extender to react, adding a small Molecular chain extender continues to react; add solvent and salt-forming agent to react, add water to disperse and emulsify after neutralization. The coating is optically active. Under light induction, superoxide free radicals are generated. It has excellent self-cleaning performance and can remove dyes or other compounds stained on its surface.

Description

technical field [0001] The invention belongs to the field of polyurethane coating and its preparation and application, in particular to a polycarboxylate photocatalyzed self-cleaning water-based polyurethane coating and its preparation and application. Background technique [0002] With the increasingly stringent requirements for green friendliness, non-toxic and environmental protection, the emission of volatile organic compounds in the traditional solvent-based polyurethane system has greatly restricted its application, while water-based polyurethane uses water instead of organic solvents in the synthesis process , to avoid the volatilization of organic solvents, so non-toxic and pollution-free waterborne polyurethane coatings have gradually become the main direction of research in the field of polyurethane materials. With people's in-depth research on water-based polyurethane and its wider application, higher requirements are put forward for its performance, and water-bas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/48C08G18/44C08G18/42C08G18/12C08G18/32C08G18/34C09D175/04C09D175/06C09D175/08
CPCC08G18/12C08G18/4238C08G18/4263C08G18/4277C08G18/44C08G18/4854C08G18/664C08G18/6659C08G18/6674C08G18/6692C09D175/04C09D175/06C09D175/08C08G18/348C08G18/3206
Inventor 侯爱芹谢孔良高爱芹胡柳
Owner DONGHUA UNIV
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