The surface modification of barite powder is based on the application of polymer materials, and the surface of barite powder is treated by physical and chemical methods to purposefully change the physical and chemical properties of the original surface of the powder and improve its dispersibility and affinity with polymer materials. In the modification of barite powder, the choice of modifier directly affects the modification effect of barite and the application effect as a filler in polymer materials. Therefore, the choice of modifier plays an important role in the preparation of active barite. Key role. Today, we will introduce the modification of barite surfactant.
1. Anionic surfactant modification
The part which is surface-active after ionization in water is a negatively charged surfactant called an anionic surfactant. Stearic acid is a widely used anionic surfactant with one end of the molecule being a long-chain alkyl group R. The structure is similar to the polymer structure and therefore has good compatibility with the polymer binder. The other end of the molecule is -COOH. It can be physically and chemically adsorbed with inorganic mineral powder.
Unmodified barite powder, because of its poor affinity with the rubber interface, limits its application in rubber. Filling the modified barite powder into rubber can not only increase the added value of barite, Reducing the production cost of rubber materials, and providing technical reference for the preparation of new rubber materials with wear resistance and aging resistance and special hardness.
As a paint filler, the modified barite powder must have good affinity with the organic paint and be uniformly dispersed in the matrix; at the same time, it can increase the gloss adhesion of the paint, and has good acid and alkali resistance. Wang Wei used stearic acid to modify the surface of barite powder. The application of modified barite ultrafine powder in F03-1 red phenolic blending paint showed that its performance can meet the index and has good performance with organic paint. Compatibility, improved hiding power, can replace expensive precipitated barium sulfate, reduce production cost Modified barite powder as paint filler, not only can reduce cost, but also increase the thickness strength and durability of paint.
2. Modification of cationic surfactant
When the surface of the barite powder is negatively charged, a cationic surface modifier such as ammonium oleate ammonium chloride, dioctadecyldimethylammonium chloride, dodecyltrimethyl bromide is used. Ammonium, dodecyldimethylbenzylammonium chloride, and the like. The positively charged reactive group reacts with the negative charge on the surface of the barite to connect the surface of the ore powder to the long-chain alkyl group, increasing the steric hindrance between the particles, preventing the particles from agglomerating during the collision, thereby causing the recrystallized The dispersion between the stone powders is better, and the long-chain alkyl groups are similar in structure to the polymer materials, and the two have good affinity.
3.Powder surface modification machine
Provided with the unique chamber design,both modification and depolymerization functions, CLG series powder surface modification machine is applicableto modify various materials.It can reach excellent surface modifications for such materials as heave/light calcium carbonate, barite, kaolin, talcum, wollastonite, mica, white carbon black, zinc oxide, alumina, silicon powder, graphite, magnesium-hydroxide, barium sulfate, illite claystone and pyrophylite, hexagonite and etc.
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