Influence of the average particle size of matting powder on coatings
1. The relationship between average particle size and transparency:
As the average particle size increases, the transparency deteriorates. The smaller the particle size of the matting powder, the less scattered visible light, and a large number of incident light rays pass through the matting powder due to diffraction, so the transparency of the system is better. However, if the average particle size is too small, the less particles will play a matting effect, and the due matting effect will not be achieved. When the average particle size is coordinated with the thickness of the coating film, the larger the average particle size, the better the matting effect of the matting powder. Therefore, when choosing a matting powder, the factors of matting, transparency and coating film thickness should be considered at the same time, and the most suitable matting powder should be selected through a comparative test.
2. The relationship between average particle size and anti-settling property:
In the same system, placed for the same time, the system with a larger average particle size, the powder sinks faster and is easy to form a hard precipitate. The sedimentation rate is proportional to the square of the particle size, so the larger the average particle size, the faster the sedimentation rate.
3. The relationship between average particle size and extinction:
The larger the average particle size, the better the matting effect of the paint; the smaller the average particle size, the better the paint transparency. In the process of selecting the matting powder, a series of comparative tests should be passed, so that the matting and transparent properties can better meet the actual use requirements.
The smaller the average particle size distribution is, the viscosity of the system will increase, and the sedimentation rate will also decrease. It is better to consider the factors of extinction and sedimentation when selecting matting powder.
Tianshiwax, manufactures of wax, matting powder on coatings.
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