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Siloxane modified urethane acrylate hyperbranched oligomer and preparation method thereof and multi-curing coating obtained therefrom

A polyurethane acrylate and siloxane modification technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of air bubbles on the surface of the coating film, the compatibility of the primer and topcoat, and the weather resistance of the topcoat. , to achieve the effect of comprehensive chemical resistance, good adhesion fastness and thorough curing

Inactive Publication Date: 2012-05-16
恒昌涂料(惠阳)有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if too much active diluent is added, the active small molecules will easily enter the surface of the primer, resulting in a decrease in the compatibility of the primer and topcoat during the curing reaction, distortion of the color of the primer, and a decrease in the weather resistance of the topcoat; adding too much volatile organic solvent It will increase pollution, waste oil resources, and easily cause bubbles and softening on the surface of the coating film during the curing process
[0004] 2. Since most of the digital products are three-dimensional profiles, the coated objects with complex shapes may not be cured enough in the shadow parts that cannot be irradiated by ultraviolet light.
In addition, the UV curing process is a process in which oligomers react with active monomers to produce macromolecules. The coating film on the plastic workpiece may shrink in volume, resulting in reduced adhesion of the dry film on the substrate of the electronic product, and even cracks.

Method used

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Experimental program
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Effect test

preparation example Construction

[0031] The preparation method of the above-mentioned Si-PUA oligomers, the steps are: A, measure the polyol and place it in the reactor, the vacuum degree is 0.266 ± 0.005kPa, and the temperature is 120 ± 10 ° C. After dehydration for 2 ± 0.5h, take a sample and measure the moisture content. When the water weight content is less than 0.05±0.01%, drop to 50-60°C; B. Add metered diisocyanate dropwise to the system in step A, react at 70-75°C for 2-4 hours, and take samples every 0.5h NCO group content, when -NCO group weight content changes = 0.01%, add the measured hyperbranched polyester into the above system, keep 70 ~ 75 ° C for 0.5 ~ 1h; C, weigh the polymerization inhibitor dissolved in the measured hydroxyl group Acrylate, add dropwise to step B system within 0.5~1h, add metered catalyst, raise temperature to 80~85°C, react for 2~4h; D, add metered bisaminosiloxane and Reactive diluent, kept at 80-85°C for 1-2 hours, then cooled to room temperature.

[0032] The UV-heat-...

Embodiment 1

[0034] A. Take 40g of polyethylene glycol with a molecular weight of 200 and 40g of polypropylene glycol with a molecular weight of 400 and place them in a reaction kettle. After dehydration for 2 hours at a vacuum of 0.266kPa and a temperature of 120°C, take a sample to measure the moisture content. When the moisture content is less than 0.05±0.01%, drop to 50~60°C; B. Add dropwise a mixture of 222g isophorone diisocyanate and 84g hexamethylene diisocyanate to the system of step A, react at 70°C for 2h, every 0.5h Sampling and determination of -NCO group content, when -NCO group weight content change=0.01%, 35g of hyperbranched polyester was added to the above system, and kept at 75°C for 1h reaction; C, weighed 0.7g of hydroquinone and dissolved it in 286g Add 0.3g of dibutyltin dilaurate to the hydroxyethyl methacrylate dropwise within 0.5h, add 0.3g of dibutyltin dilaurate, raise the temperature to 80°C, and react for 2h; D. Add 22.2g of dibutyltin dilaurate to the step C s...

Embodiment 2

[0039] A. Take 40g of polyethylene glycol with a molecular weight of 400 and 30g of polypropylene glycol with a molecular weight of 600 and place them in a reaction kettle. After dehydration for 2 hours at a vacuum of 0.266kPa and a temperature of 120°C, take a sample to measure the moisture content. When the moisture content is less than 0.05±0.01%, drop to 50~60°C; B. Add dropwise the mixture of 111g isophorone diisocyanate and 16.8g hexamethylene diisocyanate to the system of step A, react at 70°C for 2h, every 0.5 h sampling measurement-NCO group content, when-NCO group weight content change=0.01%, 17.5g hyperbranched polyester is added in the above-mentioned system, keep 75 ℃ of reaction 1h; C, take the hydroquinone solution of 0.3g In 92.8g of hydroxyethyl acrylate, add dropwise to the step B system within 0.5h, add 0.05g of dibutyltin dilaurate, raise the temperature to 80°C, and react for 2h; D, add 13.2g to the step C system N-β-(aminoethyl)-γ-aminopropyltriethoxysila...

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Abstract

The invention discloses a siloxane modified urethane acrylate hyperbranched oligomer and a preparation method thereof and a multi-curing coating obtained therefrom. The siloxane modified urethane acrylate hyperbranched oligomer is short for Si-PUA aligomer and the weight percentage composition thereof is as follows: 20 wt percent to 50 wt percent of vulcabond, 5 wt percent to 40 wt percent of polylol, 20 wt percent to 50 wt percent of hydroxyl acrylate, 1 wt percent to 20 wt percent of heperbranched polyester, 0.5 wt percent to 10 wt percent of diamino siloxane, 0.001 wt percent to 1 wt percent of catalyst, 0.001 wt percent to 1 wt percent of inhibitor and 5 wt percent to 50 wt percent of reactive diluent. The multi-curing coating containing such Si-PUA aligomer can not only realize ultraviolet light-heat dual curing but also realize moisture curing, thus improving the hardness and enhancing adhesive force of the film thereof and having better properties of water resistance, chemical agent resistance and friction resistance.

Description

technical field [0001] The invention relates to a siloxane-modified polyurethane acrylate hyperbranched oligomer, a preparation method thereof, and an obtained ultraviolet light-heat-moisture multiple curing coating. Background technique [0002] UV-curable coatings are coatings that undergo rapid physical and chemical changes in a short period of time after being irradiated by ultraviolet light of a certain wavelength. Compared with traditional natural drying or heat-curing coatings, UV-curing coatings have the advantages of fast curing speed, energy saving, high hardness, good wear resistance, low organic volatile content, and wide application range for substrates. In recent years, the voice of public opinion to protect the ecological environment has been increasing day by day. Some developed countries and China have successively formulated fire protection regulations and environmental protection regulations to limit the use of solvent-based coatings or reduce the content ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/83C09D175/14
Inventor 陈健荣杨爱军娄喜王小妹吕健汶
Owner 恒昌涂料(惠阳)有限公司
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