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Manufacturing method of UV curing powder coating

A technology of powder coatings and production methods, applied in powder coatings, polyester coatings, coatings, etc., can solve problems such as multi-energy, paint film shrinkage, and environmental pollution at construction sites, and achieve excellent physical and chemical properties, fast curing speed, and flow good level performance

Inactive Publication Date: 2011-09-14
HUNAN UNIV OF ARTS & SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, liquid UV-curable coatings currently on the market need to add a certain amount of low-molecular reactive diluting monomers during construction. On the one hand, this will pollute the construction site environment; on the other hand, it will cause the paint film to shrink, thereby affecting the coating. performance
[0003] For the powder coatings currently on the market, they do not contain toxic volatile substances and can overcome the above-mentioned shortcomings of liquid UV-curable coatings, but they are mainly used for the coating of metal parts. This is due to the melting and leveling temperature of the powder coatings currently produced. And the curing temperature is higher than 140 ℃, so its coating conditions must be above 140 ℃. On the one hand, it will consume more energy during coating, on the other hand, its application range is limited, that is, a large number of non- Metal products cannot be painted with this kind of paint

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. Add 1050 grams of 2,2-dimethylolpropionic acid and 100 grams of trimethylolpropane to the reaction flask respectively, then add 10.5 grams of toluenesulfonic acid, and react under nitrogen protection at 140°C for 1.5 h, keep warm and vacuumize (vacuum degree is 300-400Pa) for 1h, cool down to 100°C, add 90g of maleic anhydride, react at 140°C for 2h under nitrogen protection, and obtain solid hyperbranched resin A after cooling.

[0022] Two, the preparation of hyperbranched resin B:

[0023] Weigh 140 grams of phthalic anhydride, 132 grams of trimethylolpropane and 1.3 grams of zinc acetate, add them to the reaction flask respectively, heat and melt under the protection of nitrogen, the reaction temperature is 140 ° C, the reaction time is 4.5 hours, and then cooled to 100 ° C Next, add 19 grams of trimellitic anhydride and 1.2 grams of toluenesulfonic acid, react at 145°C for 1.5 hours under nitrogen protection, vacuumize (vacuum degree is 300-400Pa) and keep warm ...

Embodiment 2

[0028] Step one and step two are identical with embodiment 1;

[0029] 3. Preparation of UV-curable powder coating:

[0030] Weigh 95 grams of hyperbranched resin B, 2.0 grams of CGI1800 photoinitiator, and 1.0 grams of BYK361 leveling agent, and pre-mix for 15 minutes. The mixture is melted and extruded by a screw extruder, and then cooled, crushed, finely pulverized, and sieved to obtain a UV-curable powder coating.

[0031] Electrostatically spray the above paint on the tinplate sheet, melt it at 120°C for 10-15 minutes, place it under a 1KW high-pressure lamp, and irradiate it for 3-5 seconds at a distance of 30cm from the lamp source. The adhesion of the paint film is measured to be grade 1, and the flexibility 1mm, the impact strength is 4.9N.m, and the hardness of the coating film measured by the double pendulum method reaches 0.75.

Embodiment 3

[0033] Step one and step two are identical with embodiment 1;

[0034] 3. Preparation of UV-curable powder coating:

[0035] Weigh 50 grams of hyperbranched resin A and 45 grams of hyperbranched resin B, 2.0 grams of CGI1800 photoinitiator, and 1.0 grams of BYK361 leveling agent, and pre-mix for 15 minutes. The mixture is melted and extruded by a screw extruder, and then cooled, crushed, finely pulverized, and sieved to obtain a UV-curable powder coating.

[0036] Electrostatically spray the above paint on the tinplate sheet, melt it at 120°C for 10-15 minutes, place it under a 1KW high-pressure lamp, and irradiate it for 3-5 seconds at a distance of 30cm from the lamp source. The adhesion of the paint film is measured to be grade 1, and the flexibility 1mm, the impact strength is 4.9N.m, and the hardness of the coating film measured by the double pendulum method reaches 0.75.

[0037] The paint of the present invention is sprayed on the cold-rolled steel plate with cathodic...

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Abstract

The invention discloses a manufacturing method of UV curing powder coating, comprising the following technical steps: 1. preparation of hyperbranched resin A and B capable of being cured with UV; 2. material preparation of UV curing powder coating production; 3. preparation technology: after needed raw materials are prepared, operating according to the following steps: 1) after 95 parts of hyperbranched resin A or hyperbranched resin B or the mixture of A and B is roughly crushed, adding 0.5-2.5 parts of photoinitiator, 0.3-1.5 parts of flatting agent and other accessory ingredients, and premixing for 15 minutes; 2) extruding out by a screw extruder, cooling, crushing, micro-grinding and screening to obtain the UV curing powder coating. The product of the invention has favorable levellingproperty and high curing speed (curing can be finished within 3-5 seconds); the coating has excellent physiochemical performance and does not turn yellow, so that the coating is an UV curing powder coating product with excellent indoor and outdoor use performance.

Description

Technical field: [0001] The invention belongs to an organic chemical coating, namely a method for preparing an ultraviolet light curing powder coating. Background technique: [0002] UV-curable coatings are irradiated with ultraviolet light to cure the coating rapidly. It is characterized by high efficiency, energy saving and resource saving. It is widely used in electronics, printing, chemical industry, construction, light industrial appliances, wooden furniture, automobiles, instruments, modern Communication equipment and facilities, aerospace equipment and facilities and other fields. However, liquid UV-curable coatings currently on the market need to add a certain amount of low-molecular reactive diluting monomers during construction. On the one hand, this will pollute the construction site environment; on the other hand, it will cause the paint film to shrink, thereby affecting the coating. performance. [0003] For the powder coatings currently on the market, they do...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D167/06C09D5/03
Inventor 周诗彪肖安国郑清云陈贞干郝爱平申有名
Owner HUNAN UNIV OF ARTS & SCI
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