Preparation method for light-heat dual-cured woodware UV varnish coating

A dual-curing, varnish coating technology, used in epoxy resin coatings, coatings, etc., can solve problems such as difficult curing, inability to cure, and conversion rate limitations, and achieve high adhesion, chemical corrosion resistance, and coating film hardness. high effect

Inactive Publication Date: 2012-01-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology allows for better flexibility when creating protective layers such as paints due to their ability to absorb sunlight without losing effectiveness during long periods of exposure compared to traditional methods like solvent borne polyester (SB) based primers. Additionally, this new material offers improved durability against environmental factors including water vapor, ozone, acid rain, snow, ice impact, abrasives, sand particles, dirt, polishing agents, cleanliness issues, and other challenges associated with conventional photocurable materials. Overall, these technical features improve protection properties while reducing costs.

Problems solved by technology

The technical problem addressed in this patented text relates to improving the properties of painted surfaces made with conventional oily materials like acrylics due to their low volatile components (volatilization) during manufacturing processes. This limits the ability to convert them into durability when exposed to sunlight without losing effectiveness over longer periods of storage.

Method used

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  • Preparation method for light-heat dual-cured woodware UV varnish coating

Examples

Experimental program
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Effect test

Embodiment 1

[0025] (1) Calculated in parts by weight, every 1g is 1 part, take 100g of industrial grade epoxy resin E51, add it to the reaction kettle, heat it in an oil bath, and raise the temperature to 110°C; then add 25g of industrial grade methacrylic acid, After mixing 1g of industrial grade N,N-dimethylbenzylamine and 0.05g of hydroquinone evenly, add it into epoxy resin E51 evenly within 4 hours, keep the temperature of epoxy resin E51 at 110°C during the dropping process , Measure the acid value immediately after the dropwise addition, and then measure the acid value every half an hour. After the acid value drops below 5mg / g, cool the reaction system to 30°C, and then add 32g of trimethylolpropane triacrylate (TMPTA ), after stirring evenly, the material is cooled and discharged to obtain epoxy acrylate;

[0026] (2) Add 3.5g of photoinitiator Darocure1173 provided by Shanghai Chuangxin Chemical Co., Ltd., 3.5g of photoinitiator 184 provided by Wuhan Dinghui Chemical Co., Ltd. an...

Embodiment 2

[0028] (1) Calculated in parts by weight, each 1g is 1 part, take 50g of industrial grade epoxy resin E44 and 50g of industrial grade epoxy resin E51, add them to the reaction kettle, heat them in an oil bath, and raise the temperature to 110°C; then After mixing 25g industrial grade methacrylic acid, 1g industrial grade tetrabutylammonium bromide and 0.1g hydroquinone evenly, they were evenly added to the epoxy resin within 3 hours, and the temperature of the epoxy resin was kept at 110°C, measure the acid value immediately after the dropwise addition, then measure the acid value every half an hour, wait until the acid value drops below 5mg / g, cool the reaction system to 30°C, and then add 32g of trimethylolpropane triacrylate (TMPTA), cooling discharge after stirring, obtain epoxy acrylate;

[0029] (2) Add 3.5g of Darocure1173 provided by Shanghai Chuangxin Chemical Co., Ltd., 3.5g of photoinitiator 184 provided by Wuhan Dinghui Chemical Co., Ltd. and 4.92g of thermal initi...

Embodiment 3

[0031](1) Calculated in parts by weight, each 1g is 1 part, take 25g of industrial grade epoxy resin E44 and 75g of industrial grade epoxy resin E51, add them to the reaction kettle, heat them in an oil bath, and raise the temperature to 90°C; then Mix 25g of industrial-grade acrylic acid, 1g of industrial-grade N,N-dimethylbenzylamine and 0.15g of hydroquinone evenly and add them to the epoxy resin within 2 hours. During the dropping process, keep the temperature of the epoxy resin at 90°C, measure the acid value immediately after the titration is completed, then measure the acid value every half an hour, until the acid value drops below 5mg / g, cool the reaction system to 30°C, then add 32g trimethylolpropane triacrylate ( TMPTA), after stirring evenly, cooling discharge, obtain epoxy acrylate;

[0032] (2) 3.5g of Darocure1173 provided by Shanghai Chuangxin Chemical Co., Ltd., 3.5g of photoinitiator 184 provided by Wuhan Dinghui Chemical Co., Ltd., 2.5g of azobisisobutyronit...

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Abstract

The present invention provides a preparation method for a light-heat dual-cured woodware UV varnish coating. The method comprises: uniformly mixing an acrylic acid monomer, a catalyst and a polymerization inhibitor; adding the resulting mixture to epoxy resin with a temperature of 90-120 DEG C to carry out a reaction at a certain temperature; adopting acid value detecting to monitor the extent of the reaction, wherein the epoxy acrylate (EA) is obtained when the acid value is reduced to less than 5 mg/g; adding a thermal initiator, a photoinitiator, an antifoaming agent, a wetting and dispersing agent, a thickening agent and a leveling agents to the EA, then mixing and stirring to obtain the UV varnish coating. The prepared UV varnish coating through the method provided by the present invention has the dual functions of light curing and heat curing, the surface dry can be rapidly achieved in 4-8 seconds under the light intensity of 250-400 mJ/cm<2>, the film forming and the curing can be achieved in 1-5 hours at the temperature of 50-70 DEG C. In addition, the prepared UV varnish coating has characteristics of high adhesion, good chemical corrosion resistance, high film hardness and low cost, and provides more excellent construction performance, curing method and film performance than ordinary UV-cured coatings.

Description

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Claims

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Application Information

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Owner SOUTH CHINA UNIV OF TECH
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