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Preparation method of rapid UV-cured fluorine-containing hydrophobic polyurethane elastic coating layer

A polyurethane elastic, light-curing technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of affecting the performance of polyurethane products, time can not be cured, affecting gloss, etc., to shorten the curing time, reduce dosage, operation Simple and practical effects

Inactive Publication Date: 2015-09-16
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, factors such as curing time and photoinitiator content not only have a great impact on the production cost and production efficiency of polyurethane elastic coatings, but also have a great impact on the performance of polyurethane elastic coating products. Too long light curing time will It will make the product yellow and affect the gloss. If the time is too short, it cannot be cured completely. At the same time, the content of photoinitiator is also crucial to the performance of polyurethane products. It is found that the content of photoinitiator is generally about 3wt%. The curing is not complete, and continuing to increase the content of photoinitiator will not significantly promote the curing efficiency and curing degree, but will affect the performance of polyurethane products. The performance curing method has a certain promotion effect on the development of UV light curing polyurethane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] After adding the solvent of 60g hydroxyl-terminated polybutadiene (HTPB) and 60wt% in reactor, slowly add dropwise the isophorone diisocyanate (IPDI) that contains 0.03wt% catalyzer and 0.04wt% stopper of 6.67g, stir Uniform and react at 45°C for 2.5h to synthesize isocyanate-terminated polyurethane prepolymer; then slowly add 0.68g of 1,4-butanediol (BDO) dropwise and react at 60°C for 3h; finally add dropwise 1.74g of acrylic acid Hydroxyethyl ester (HEA) continued to react at 60°C for 2h to end-cap, to synthesize a double-bond-terminated polyurethane resin.

Embodiment 2

[0027] After adding 60g hydroxyl-terminated polybutadiene (HTPB) and 60wt% solvent in the reactor, slowly add dropwise 7.51g diphenylmethane diisocyanate (MDI) containing 0.03wt% catalyst and 0.04% polymerization inhibitor, stir well And reacted at 45°C for 2.5h to synthesize isocyanate-terminated polyurethane prepolymers; then slowly added dropwise 0.57g of 1,3 propylene glycol and reacted for 3h at 60°C; finally added dropwise 4.47g of pentaerythritol triacrylate (PETA) in Continue to react at 60°C for 2h to end-cap, and synthesize a double-bond-terminated polyurethane resin.

Embodiment 3

[0029] Take 100 parts of synthetic polyurethane resin, 10 parts of reactive diluent trimethylolpropane triacrylate (TMPTA), 1 to 4 parts of crosslinking agent tetrakis (3-mercaptopropionic acid) pentaerythritol ester, 3 parts of fluorine-containing acrylate mono After N-butyl perfluorooctylsulfonyl aminoacrylate ethyl ester, 2 parts of silane coupling agent γ-(methacryloyloxy)propyltrimethoxysilane (KH-570), 2 parts of photoinitiator 1173 Use a high-speed mixer to add 15 parts of ethyl acetate in batches at a speed of 1000 r / min, and stir for 30 minutes to obtain a slurry. Films were formed on smooth aluminum plates and tinplate plates by scraping, baked in a vacuum oven at 50°C for 30 minutes, and then cured on a UV curing machine to obtain a fluorine-containing hydrophobic polyurethane elastic coating.

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PUM

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Abstract

The invention relates to a preparation method of a rapid UV-cured fluorine-containing hydrophobic polyurethane elastic coating layer. The method comprises the following steps: reacting diisocyanate with hydroxyl-terminated polybutadiene (HTPB) to generate an isocyanato-terminated prepolymer, carrying out a chain extension reaction by using dihydric alcohol, blocking by using hydroxy acrylate to synthesize double bond terminated polyurethane resin, and compounding the obtained resin with a diluent, a photo-crosslinker, a fluorine-containing acrylate monomer, a silane coupling agent and a photoinitiator, and curing under ultraviolet light to form the coating layer. A mercapto group-containing crosslinker is added to improve the curing efficiency of the coating layer and reduce the consumption of the photoinitiator; and above fluorine-containing compound is introduced to facilitate improvement of the hydrophobicity and the pollution resistance of the surface of the coating layer.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a preparation method of a fast UV light-cured fluorine-containing hydrophobic polyurethane elastic coating. Background technique [0002] UV curing polyurethane inherits and develops many advantages of traditional UV curing technology and polyurethane coating, such as low cost, low viscosity, good coating adaptability, simple equipment, non-toxic, non-irritating, etc. Due to the outstanding advantages of UV curable polyurethane elastic coating, it has developed rapidly in recent years, and its products have been applied in many fields. [0003] However, factors such as curing time and photoinitiator content not only have a great impact on the production cost and production efficiency of polyurethane elastic coatings, but also have a great impact on the performance of polyurethane elastic coating products. Too long light curing time will It will make the pro...

Claims

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Application Information

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IPC IPC(8): C08G18/69C08G18/67C08G18/32C08G18/10C09D175/16C09D7/12
CPCC08G18/69C08G18/3206C08G18/672C09D7/63C09D175/16
Inventor 倪忠斌钟汶桂刘士荣陈明清
Owner JIANGNAN UNIV
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