Calcium Carbonate (Light)

Light Calcium Carbonate is also known as Precipitated Calcium Carbonate (PCC).Light calcium carbonate is obtained by chemical processing.Because its sedimentation volume (2.4-2.8mL/g) is larger than that of heavy calcium carbonate produced by mechanical methods (1.1-1.9mL/g), it is called light calcium carbonate.

Traits

White powder or colorless crystal.Odorless.Tasteless.825 ℃ decomposes into calcium oxide and carbon dioxide.Soluble in dilute acid and release carbon dioxide, insoluble in alcohol.There are two kinds of crystals, one is orthorhombic crystal aragonite, the other is hexagonal rhombohedral crystal calcite.Calcite, irritating.

a The particle shape is regular and can be regarded as a monodisperse powder, but it can be in various shapes, such as spindle shape, cube shape, needle shape, chain shape, spherical shape, flake shape and quadrangular column shape.These different shapes of calcium carbonate can be prepared by controlling the reaction conditions.

b The particle size distribution is narrow.

c Small particle size, the average particle size is generally 1-3 μm.To determine the average particle size of light calcium carbonate, the short-axis particle size in the triaxial particle size can be used as the apparent particle size, and then the median particle size is taken as the average particle size.The average particle size refers to the average short-axis particle size, unless otherwise specified.

Effect

Calcium carbonate is one of the earliest large fillers used in the rubber industry. A large amount of calcium carbonate is filled in the rubber, which can increase the volume of the product, thereby saving expensive natural rubber and reducing costs. Calcium carbonate is filled into rubber. Obtains higher tensile strength, abrasion resistance, tear strength than pure rubber vulcanizate, and has a significant reinforcing effect in natural and synthetic rubber, while the consistency can be adjusted.

Calcium carbonate can play a skeleton role in plastic products, which has a great effect on the dimensional stability of plastic products, can improve the hardness of products, and can also improve the surface gloss and surface smoothness of products.Adding calcium carbonate to general plastic products can improve the heat resistance. Because the whiteness of calcium carbonate is above 90%, it can also replace expensive white pigments to play a certain whitening effect.

Calcium carbonate is used in a large amount in the paint industry and is an indispensable framework. The amount used in thick paint is more than 30%, and the amount of phenolic enamel is 4-7%, and the phenolic fine pattern wrinkle paint is more than 39%.

The application in the water-based coating industry is more widely used, which can make the coating non-settling, easy to disperse, and good gloss. The dosage in the water-based coating is 20-60%.