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Water-based ultraviolet-thermal dual-curing coating and preparation method thereof

A UV and dual curing technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of poor water resistance and anti-foaming performance

Active Publication Date: 2013-11-27
CHANGCHUN SANHUA IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of poor water resistance and anti-foaming performance of the existing water-based UV-heat dual-curing coating, and to provide a water-based UV-heat dual-curing coating and its preparation method

Method used

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  • Water-based ultraviolet-thermal dual-curing coating and preparation method thereof
  • Water-based ultraviolet-thermal dual-curing coating and preparation method thereof
  • Water-based ultraviolet-thermal dual-curing coating and preparation method thereof

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preparation example Construction

[0028] The water-based polyurethane acrylate of the present invention is nonionic water-based polyurethane acrylate modified by siloxane, and the preparation method comprises:

[0029] Step 1: reacting bisphenol A epoxy resin, polyethylene glycol and hydroxypropyl polydimethylsiloxane to obtain the first intermediate;

[0030] Step 2: reacting the first intermediate obtained in step 1 with diisocyanate to obtain a second intermediate;

[0031] Step 3: reacting the second intermediate obtained in Step 2 with the acrylate containing hydroxyl group to obtain water-based polyurethane acrylate.

[0032] Add bisphenol A epoxy resin, polyethylene glycol and hydroxypropyl polydimethylsiloxane to the reaction kettle as described in step 1 of the present invention to react to obtain the first intermediate, preferably at a reaction temperature of 120°C , the vacuum degree is under 0.098MPa, reacted under the condition of decompression and water removal for 1.5-3 hours; the bisphenol A e...

Embodiment 1

[0049] The first step, with 198g bisphenol A epoxy resin E51, 1000g polyethylene glycol (molecular weight=1000 Dalton, K + and Na + The total content of 20ppm;) and 2000g of hydroxypropyl polydimethylsiloxane (molecular weight = 2000 Daltons) were added to the reactor, the temperature was raised to 120°C, and the vacuum degree was 0.098MPa, and the water was removed under reduced pressure for 2 Hour;

[0050] In the second step, under nitrogen protection, drop the temperature of the reactor to 70°C, stir at a speed of 65rpm, and simultaneously add 696g of 2,4-toluene diisocyanate dropwise at a rate of 8ml / min. After the addition, the temperature Rising to 80°C, continue stirring for 1.5h;

[0051] After the third step and the second step reaction finished, add 1168g acetone to reduce the viscosity of the system in the reactor, meanwhile, add 1.168g catalyst dibutyltin dilaurate and 0.116g polymerization inhibitor p-hydroxyanisole, and the reaction temperature is controlled a...

Embodiment 2

[0053] The first step, with 378g bisphenol A epoxy resin E12, 5000g polyethylene glycol (molecular weight=5000 Dalton, K + and Na + The total content is 15ppm;) and 6000g of hydroxypropyl polydimethylsiloxane (molecular weight = 6000 Daltons) was added to the reactor, the temperature was raised to 120°C, and the vacuum degree was 0.098MPa, and the water was removed under reduced pressure for 2 Hour.

[0054] The second step, under the protection of nitrogen, lower the temperature of the reactor to 75°C, stir at a speed of 75rpm, and simultaneously add 1008g of diphenylmethane-4,4-diisocyanate dropwise at a rate of 12ml / min, and the addition is completed Afterwards, the temperature rose to 85°C, and the stirring reaction was continued for 2.5h;

[0055] After the third step and the second step reaction, add 4954g of acetone to the reactor to reduce the viscosity of the system. At the same time, add 6.193g of catalyst stannous octoate and 1.325g of polymerization inhibitor hyd...

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Abstract

The invention provides a water-based ultraviolet-thermal dual-curing coating and a preparation method thereof, belongs to the technical field of water-based coatings and solves the problem that a conventional water-based ultraviolet-thermal dual-curing coating has poor waterproof and anti-foaming properties. The coating provided by the invention comprises 85-120 parts of water-based urethane acrylate, 0.1-0.3 part of water-based flatting agent, 0.2-0.6 part of water-based wetting agent, 1.2-2.6 parts of photoinitiator, 8-12 parts of water-based cosolvent and 4.5-8 parts of water-based curing agent. The water-based urethane acrylate is nonionic water-based urethane acrylate modified by silicone. The invention further provides the preparation method of the water-based ultraviolet-thermal dual-curing coating. After being soaked in indoor-temperature water for 24 hours, the water-based ultraviolet-thermal dual-curing coating doesn't foam, wrinkle or flake off, which proves that the water-based ultraviolet-thermal dual-curing coating has excellent waterproof and anti-foaming properties.

Description

technical field [0001] The invention belongs to the technical field of water-based coatings, and in particular relates to a water-based ultraviolet-heat dual-curing coating and a preparation method thereof. technical background [0002] Compared with traditional water-based heat-curing coatings, water-based UV-curable coatings can save energy by more than 75%. Therefore, water-based UV-curable coatings have received a lot of research and reports in recent years. For thick paint films, limited by the influence of UV penetration depth, single UV curing is also difficult to cure completely, resulting in serious defects in the cured paint film, while water-based UV-heat dual-curing coatings cannot be completely cured under UV rays In the case of heat curing, complete curing can be achieved. Patent CN101418147A discloses a water-based ultraviolet-heat dual-curing coating composition and its preparation method. The dual-curing coating uses water-based polyurethane acrylate as the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/16C09D7/12C08G18/67C08G18/61C08G18/58C08G18/48
Inventor 张振久蒋舰马海松陈景玉张恩綦高成勇
Owner CHANGCHUN SANHUA IND
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