Yuan Lei's Little Knowledge | Which Coating (II) Are Different Mineral Powders Suitable
Non-metallic minerals are mainly used as functional fillers in the coatings industry. The purpose is to reduce the cost of coatings; increase the consistency of latex paint, improve the suspension of pigments in the paint; give coatings functionality and improve their properties, including gloss, hiding Power, flow and homogenization, durability, film thickness, penetration and rheology.
There are many kinds of mineral fillers and their performance varies greatly. Therefore, it is the key for non-metallic mineral powder manufacturers to open the coating market to thoroughly understand the performance and best application of mineral fillers.
As a solvent-free coating, powder coating has the characteristics of economy, environmental protection, high efficiency and excellent performance. The fillers used in powder coatings are mainly barite, calcium carbonate and wollastonite. The choice of filler depends on the type of resin used, gloss requirements, mechanical properties and the end use of the coating.
Powder coatings with wollastonite as filler have natural luster, much lower than powder coatings with barite and calcite as filler, wollastonite can enhance the mechanical strength and corrosion resistance of the coating.
Barite has a higher hiding rate and longer lasting high gloss than calcite. Barite has the characteristics of chemical inertness and low oil absorption, which will only slightly reduce the fluidity and smoothness of powder coatings.
The typical dosage range of barite filling is 5-30%, the powder coating is solid, and the weight is the sales unit. The large proportion of barite can satisfy the manufacturer.
Compared with precipitated barium sulfate, the advantage of natural barite is that natural barite with low heavy metal content can be used, and the price is cheap.
(3) Mica powder
Mica powder is composed of complex silicate, the particles are scaly, heat resistance, acid and alkali resistance is excellent, has an impact on the melt fluidity of powder coatings, generally used in temperature and insulating powder coatings, can be used as texture powder filler.
(4) Heavy calcium carbonate
Because most of the places where heavy calcium is applied are not very strict about the fineness, the heavy calcium currently on the market is generally not surface treated. However, due to poor fluidity of powder coatings, ultrafine heavy calcium carbonate should generally be surface modified. The modifier uses more coupling agents such as titanate, phosphoric acid, surfactant, aluminum sulfate and sodium hexametaphosphate, etc. Sometimes fatty acids are also considered. In recent years, there have been some examples of using polymers as surface treatment agents. Through modification, the amount of calcium carbonate can be increased by 20% ~ 50%, and the gloss and leveling are increased. Because heavy calcium carbonate is non-toxic, it has a market base in non-toxic powder coatings, such as strollers, toys, etc.
Suitable for, powder coating, barite, filler, coating, calcium carbonate, as, wollastonite, with, gloss
Kaolin is a non-metallic mineral, which is a kind of clay and clay rock mainly composed of kaolinite clay minerals. Because it is white and delicate, also known as white earth. It is named after Gaoling Village, Jingdezhen, Jiangxi Province.
Barium sulfate is based on barite as the main raw material, through beneficiation, ore washing, crushing and other processes. Barium sulfate has a hardness of 3~3.5 (Mohs) and a specific gravity of 4.3~4.7. It has the characteristics of high specific gravity, low hardness and brittleness. Barite is almost insoluble in water, ethanol and acid, soluble in hot concentrated sulfuric acid. With the development of some high-performance barium sulfate products, the application field of barium sulfate is constantly expanding.