1. Heavy calcium
Heavy calcium, short for heavy calcium carbonate, is ground from natural carbonate minerals such as calcite, marble, and limestone. It is a commonly used powdered inorganic filler, with high chemical purity, high inertness, not easy to chemical reaction, good thermal stability, no decomposition below 400 ℃, high whiteness, low oil absorption, low refractive index, soft, dry, It does not contain crystal water, has low hardness, small wear value, non-toxic, tasteless, odorless, and good dispersibility. Ordinary heavy calcium powder, ultrafine ground calcium carbonate, wet grinding ultrafine calcium carbonate, and ultrafine surface modified ground calcium carbonate can be provided as required.
Heavy calcium has been widely used in papermaking, plastics, plastic films, chemical fibers, rubber, adhesives, sealants, daily chemicals, cosmetics, building materials, coatings, paints, inks, putty, sealing wax, putty, felt packaging, medicine, food (such as chewing gum, chocolate), feed.
2. Light calcium
Light calcium (light calcium carbonate) is obtained by calcining limestone at high temperature into quicklime, adding water to make lime emulsion and carbonizing it with CO2. Light calcium carbonate, also known as precipitated calcium carbonate, referred to as light calcium carbonate. Due to the slow reaction between calcium hydroxide and carbon dioxide in the water phase in the carbonization method, the obtained light calcium has the characteristics of small density and small particle size, and during the reaction process, the surface of the light calcium will form rough and concave-convex phenomena. , which also means that the specific surface area of light calcium is larger.
Therefore, light calcium can be widely used in papermaking, plastics, plastic films, chemical fibers, rubber, adhesives, sealants, daily chemicals, cosmetics, building materials, coatings, paints, inks, putty, sealing wax, putty, felt packaging, medicine , food (such as chewing gum, chocolate), feed.
Its functions are: increase product volume, reduce cost, improve processing performance (such as adjusting viscosity, rheological properties, vulcanization properties), improve dimensional stability, reinforce or semi-reinforce, improve printing performance, and improve physical properties (such as heat resistance properties, matting, abrasion resistance, flame retardancy, whiteness, gloss), etc.
3. Activated calcium carbonate
The production process of activated calcium carbonate is roughly the same as the production of light calcium carbonate, but in the carbonization process, the conditions should be strictly controlled to produce fine calcium carbonate particles, and then surface treated with an activator.
The characteristics of active calcium:
(1) Appearance: white powder, non-toxic, odorless, non-irritating, non-flammable, non-explosive, low refractive index, easy to color, insoluble in water, stable in air.
(2) After the product is activated, the molecular structure changes, the particle size distribution is uniform, it is extremely hydrophobic, the filling amount is large, and it has excellent lubricity, fluidity, dispersibility and organicity.
(3) The intermolecular affinity with rubber and plastic is strong, and the filling amount can be 2-5 times to several times more than that of ordinary calcium carbonate, and the overall production cost is significantly reduced.
Application of Active Calcium
1. In plastics, it can improve the dimensional stability, hardness and rigidity of plastic products, improve the processing performance of plastics and the heat resistance and astigmatism of products,
2. As a filler in rubber, it can increase volume, reduce cost, improve processing performance and vulcanization performance;
3. In papermaking, it can be used as paper filler, white pigment of coated paper, filler of calcium plastic paper, etc.;
4. As a filler in paint, it can act as a skeleton, so it is called “extender pigment”; in oil-based paint, the filling amount can reach 10-50%, and in water-based paint, the filling amount can reach 10-20%.