With the continuous improvement of people's living standards, many people have bought new houses. Everyone who has just bought a new house must be carefully renovated. There is no size for decoration, and every detail of the decoration is very important. For example, the purchase of plates, the selection of wall paints, and the primer and primer fillers. Among them, the correct choice of filler for the transparent primer can make your decoration more perfect.
When selecting primer fillers, we first classify these filler types. At present, the most used primer fillers mainly include calcite powder (heavy calcium), talc powder , barium sulfate, quartz powder, mica powder, kaolin (calcination/washing), wollastonite, synthetic aluminum silicate, etc. Each has its own characteristics. When selecting the right filler, we should consider the influence of the shape of the filler particles on the paint film, the influence of the particle size of the filler, and the lipophilicity and hydrophilicity of the filler. These subtle differences are related to the use of wood lacquer.
By categorizing the above indicators, typical primer fillers such as talc, transparent gypsum, sulfuric acid and quartz powder. Among them, the talc powder particles are fibrous particles, and their transparency is mainly related to their purity and composition.
We have worked with a talc supplier to compare the transparency of talc with different mineral purity and composition. The conclusion is: The lower the CaO%, the better the transparency of the talcum powder produced by the high-purity talc mine; The talc deposit is the best in Guangxi; the high-transparent talc powder generally has a gray appearance. Barium sulfate, the effect on gloss is relatively small in all fillers, generally used as a light filler, the specific gravity is large, easy to precipitate.
Another type of primer filler used on the market is more transparent plaster. Transparent gypsum is a crystalline gypsum mine, a common sulfate mineral with calcium sulfate dihydrate. When the temperature is heated at 65 ° C, the dihydrate gypsum begins to release structural water, but the dehydration rate is relatively slow. At a temperature of about 107 ° C and a water vapor pressure of 971 mmHg, the dehydration speed rapidly increases. As the temperature continues to rise, the dehydration is more accelerated, and at 170-190 ° C, the dihydrate gypsum is dehydrated at a rapid rate to become α-hemihydrate gypsum or β-hemihydrate gypsum. After the long-term placement, the dihydrate gypsum will also be dehydrated into gypsum. The data shows that the water solubility of dihydrate gypsum is 2.08g/L, the α-hemihydrate gypsum is 6.20g/L, and the β-hemihydrate gypsum is 8.15g/L. The soluble anhydrite is 6.30g/L, so from the above information, we can see that there are many risks in the use of such so-called transparent powder. In the long-term process, it will slowly dehydrate and become opaque and soluble in water. Great increase, that is to say, the hydrophilicity is greatly increased.
Through comparative analysis, we found that although there are many varieties of primer fillers on the market, the quality is mixed and uneven. Through our comparative analysis, it was found that the safest filler for transparent primers is considered to be talc.
Source : Zhou Gong Jie Tu
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