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Method for preparing silicon dioxide extinction powder for ultraviolet photo-cureable coating

A technology of light-curing coatings and hydrated silica, which is applied in the direction of chemical instruments and methods, coatings, fibrous fillers, etc., can solve the problems of lack of matting effect, wide particle size distribution, and low technical content, and achieve matting Good effect, slow settling speed, good defoaming effect

Inactive Publication Date: 2012-08-22
SHIJIAZHUANG GAOZONG SILICON PRODS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of processing process is simple and low in technical content, resulting in obvious shortcomings in the quality of silica powder.
Although the average particle diameter of the powder reaches 5 μm, its particle size distribution is wide, and large and small particle sizes account for a considerable proportion, while large and small particle sizes do not have a matting effect
Therefore, after the matting powder produced by this method is added to the coating, the matting effect is not ideal.
At the same time, small particle size particles will adversely affect the coating viscosity, resulting in poor appearance and feel of the coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: The preparation method of the silica matting powder for UV photocurable coating adopts the following steps.

[0017] (1) The hole volume is 1.6cm 3 / g, the specific surface area is 260m 2 100kg of hydrated silica per gram is classified to 20-50 microns by an 80-mesh vibrating sieve, and about 1.5g / kg of solid gel particles are screened out, and the remaining hydrated silica is used as the base material.

[0018] (2) Put the base material into the air flow mixer, use the air flow at the lower part of the air flow mixer with a speed of not less than 0.8m / s to fluidize the base material, and then add 10 carbon alkane fluorosilicone with 20% weight of the base material The surfactant liquid is sprayed down from the top of the air flow mixer, fully mixed with the base material to obtain a mixed base material.

[0019] (3) The mixed base material is sent to the boiling drying furnace by air flow, and dried at a temperature of 300 ° C to activate the organic fl...

Embodiment 2

[0021] Embodiment 2: The process steps of this embodiment are the same as in Embodiment 1 except for the following differences.

[0022] In step (1), the pore volume is 1.4cm 3 / g, the specific surface area is 280m 2 / g of hydrated silica;

[0023] The organic fluorosilicon surface modifier used in step (2) is a 5-carbon alkane fluorosilicon surfactant;

[0024] The drying temperature in step (3) is 200°C.

Embodiment 3

[0025] Embodiment 3: The process steps of this embodiment are the same as in Embodiment 1 except for the following differences.

[0026] In step (1), the pore volume is 2.0cm 3 / g, the specific surface area is 230m 2 / g of hydrated silica;

[0027] The organic fluorosilicon surface modifier used in step (2) is a 18-carbon alkane fluorosilicon surfactant;

[0028] The drying temperature in step (3) is 250°C.

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Abstract

The invention discloses a method for preparing silicon dioxide extinction powder for an ultraviolet photo-cureable coating, which includes the following technological steps: (1) material choosing: screening hydrated silica with the pore volume of 1.4-1.8 cm<3> / g and the specific surface area of 230-280 m<2> / g and removing solid gel particles to obtain a base material; (2) material mixing: adding organic fluoro-silicone surface modifying agents with the weight accounts for 20% of the base material in the base material and evenly mixing to obtain a mixed base material; (3) drying the mixed base material at the temperature of 200-350 DEG C to obtain the wrapped base material; and (4) smashing and grading the wrapped base material to obtain the extinction powder. The method performs modified processing on surfaces of silica gel particles by using the organic fluoro-silicone surface modifying agents so that chemical wrapping on the silica gel particles by the organic fluoro-silicone surface modifying agents is achieved, the processed powder particles are easy to disperse in the coating, and the extinction powder has the advantages of being good in defoaming performance, free of thickening, slow in subsiding and good in extinction effect.

Description

technical field [0001] The invention relates to a method for preparing a matting powder, in particular to a method for preparing a matting powder for UV light-curing coatings. Background technique [0002] The use of paint to coat products is an important process in industrial production. After surface coating treatment, the surface of the product has the characteristics of soft luster, full hand feeling and eye protection. With the reduction of VOC emissions and the development of environmental protection requirements for high-solid coatings, new UV light-curing coatings have been developed rapidly. UV (ultraviolet light) curing coating refers to the photochemical reaction of the paint coating after being irradiated by ultraviolet light, so that the coating can be quickly polymerized, crosslinked and cured. This kind of coating has been successfully applied on metal, plastic, wood and other substrates because of its high energy utilization rate, suitable for heat-sensitive...

Claims

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Application Information

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IPC IPC(8): C09C1/28C09C3/00C09C3/12C09D7/12
Inventor 吴振清李先文
Owner SHIJIAZHUANG GAOZONG SILICON PRODS
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