CN-122011907-A - Ultraviolet light curing coal-based kaolin powder coating and preparation method thereof

Abstract

The invention belongs to the technical field of powder coatings, and particularly relates to an ultraviolet light curing coal-based kaolin powder coating and a preparation method thereof. In order to fully utilize titanium resources and achieve excellent coating performance, the invention uses the coal gangue calcined kaolin and titanium pigment with the mass ratio of 1:1, directly mixes the coal gangue calcined kaolin and the titanium pigment under the action of mechanical shearing force, and then mixes the coal gangue calcined kaolin and the titanium pigment with unsaturated polyester resin, photoinitiator, flatting agent, degasifying agent and defoamer to prepare the ultraviolet light curing powder coating.

Inventors

• CHENG FANGQIN
• HAN WANRU
• ZHANG JINCAI

Assignees

• 山西大学

Dates

Publication Date

20260512

Application Date

20260310

Claims (9)

1. 1. The ultraviolet light curing coal-based kaolin powder coating is characterized by comprising the following components in percentage by mass: 5% -30% of titanium dioxide and coal gangue calcined kaolin composite powder, 67.3% -91.6% of unsaturated polyester resin, 3% of photoinitiator, 0.2% of flatting agent and 0.5% of degasifying agent; The composite powder of the titanium dioxide and the coal gangue calcined kaolin is obtained by mixing the coal gangue calcined kaolin and the rutile type titanium dioxide according to the mass ratio of 1:1.
2. 2. The ultraviolet light curing coal-based kaolin powder coating according to claim 1, wherein the particle size of the coal gangue calcined kaolin is less than or equal to 2 μm, the particle size of the titanium dioxide is less than or equal to 70nm, and the two are directly mixed under the action of mechanical shearing force.
3. 3. The ultraviolet light cured coal-based kaolin powder coating of claim 1, wherein the unsaturated polyester resin is UVECOAT ® 2100.
4. 4. The ultraviolet light cured coal-based kaolin powder coating according to claim 1, wherein the photoinitiator is 2,4, 6-trimethylbenzoyl-diphenyl phosphine oxide.
5. 5. The ultraviolet light cured coal-based kaolin Powder coating according to claim 1, wherein the leveling agent is MODAFLOW ® Powder 6000.
6. 6. The ultraviolet light cured coal-based kaolin powder coating according to claim 1, wherein the degassing agent is benzoin.
7. 7. The method for preparing the ultraviolet light curing coal-based kaolin powder coating according to any one of claims 1 to 6, which is characterized by comprising the following steps: step 1, mixing coal gangue calcined kaolin and titanium dioxide under high-speed stirring to obtain titanium dioxide and coal gangue calcined kaolin composite powder; step 2, weighing titanium dioxide and coal gangue calcined kaolin composite powder, unsaturated polyester resin, photoinitiator, leveling agent and degassing agent according to a proportion, and mixing under high-speed stirring; And 3, melting the powder obtained in the step 2, rapidly extruding the melt, pressing into a sheet, and crushing to obtain the powder coating.
8. 8. The method for preparing the ultraviolet light curing coal-based kaolin powder coating according to claim 7, wherein the rotating speed of high-speed stirring in the step 1 is 1500rpm, and the time is 20-30 min.
9. 9. The method for preparing the ultraviolet light cured coal-based kaolin powder coating according to claim 7, wherein the rotation speed of the high-speed stirring in the step 2 is 200rpm, and the time is 5min.

Description

Ultraviolet light curing coal-based kaolin powder coating and preparation method thereof Technical Field The invention belongs to the technical field of powder coatings, and particularly relates to an ultraviolet light curing coal-based kaolin powder coating and a preparation method thereof, which have the advantages of high hardness, good shock resistance and excellent chemical resistance. Background The powder coating is used as an environment-friendly coating material, and has been widely applied in the fields of metal protection, home appliance decoration, electronic product shells and the like in the past. Compared with the traditional solvent-based paint, the powder paint has no volatile organic compound emission, the dropped powder in the painting process can be directly recycled, no pollution is caused, the comprehensive performance of the paint film is excellent, and the proportion of the paint film in the whole paint industry in recent years is increased year by year. Is one of the products that the coating industry is currently and future developing with emphasis. Conventional powder coatings typically use a thermal curing process, which consumes energy and takes a long time. The photoinitiator is introduced, and ultraviolet light irradiation is utilized to shorten the curing time and reduce the curing temperature. The process not only reduces the energy consumption and the cost, but also greatly improves the coating performance, and is innovation and development of a new powder coating process. The powder coating is used as a new rapidly developed coating, mainly white, applied in fields of high-grade household appliances, electric appliance shells and the like, and also used for coating battery shells of electric vehicles in recent years. The white powder paint is filled with titanium white powder, and has the advantages of high whiteness, good decoration, high covering power and the like. However, titanium resources are relatively scarce in China, the titanium dioxide preparation process flow is long, the cost is high, and the market price is high, so that enterprises are difficult to accept. Fully utilizing titanium resources to exert their excellent efficacy is currently the focus of research in this field. Research surface when titanium dioxide is applied to a coating, the functional contribution is only from a surface layer with the particle volume of about 1/3 volume ratio, and the 2/3 part of the inner core cannot play a role. Resulting in titanium resource waste. The research and development of composite filler with titanium dioxide coating the rest white inorganic pigment becomes a research hot spot. Such as titanium dioxide coated silica, calcium carbonate and other composite fillers. The traditional coating method utilizes titanate to impregnate the coal gangue for calcining the kaolin, regulates the pH value, deposits a layer of titanium hydroxide on the surface of the coal gangue for calcining the kaolin, and then carries out high-temperature calcination to form the titanium dioxide coating layer. Although the performance is good, the whole process utilizes acid solution and still has high energy consumption, so that the preparation process has high cost, and the technology is feasible and cannot be popularized and applied for many years. Under the background of the high cost performance coating filler actually required in the market, the invention provides a new coating thought, which has low cost, good performance and easy popularization and application. The technology meets the market demand and can be widely applied to white powder coating. Disclosure of Invention The invention provides an ultraviolet light curing coal-based kaolin powder coating and a preparation method thereof. The gangue calcined kaolin is used as a common filler of a common coating, is low in cost and has a flaky appearance. According to the invention, the coal gangue calcined kaolin is used as the inner core, and the nano titanium dioxide is coated on the surface of the kaolin to prepare the composite filler, so that titanium resources can be fully utilized, the user cost is greatly reduced, and meanwhile, the performance of the product can be compared with that of similar products, so that the composite filler becomes a choice with high cost performance. And the prepared coating has the advantages of high curing speed, low curing temperature, no volatile components (VOCs), high powder utilization rate and excellent comprehensive performance. The invention adopts the following technical scheme to achieve the aim: The invention provides an ultraviolet light curing coal-series kaolin powder coating, which comprises the following components in percentage by mass: 5% -30% of titanium dioxide and coal gangue calcined kaolin composite powder (filler), 67.3% -91.6% of unsaturated polyester resin (film forming substance), 3% of photoinitiator, 0.2% of flatting agent and 0.5% of degasifying agent; The composite pow