Function and application of light calcium carbonate

Light calcium carbonate, also known as precipitated calcium carbonate, referred to as light calcium carbonate, is prepared by burning limestone and other raw materials to produce lime and carbon dioxide, then adding water to digest lime to produce lime milk (main component: calcium hydroxide), adding carbon dioxide to carbonize lime milk to produce calcium carbonate precipitation, and then dehydrating, drying and crushing. Or the calcium carbonate precipitate is produced by the double decomposition reaction of sodium carbonate and calcium chloride, which is prepared by dehydration, drying and crushing. The settling volume of light calcium carbonate is 2.4-2.8 ml / g. The results show that the particle of ordinary calcium is in the shape of jujube nucleus when it is fully dispersed. The long diameter is about 5-12 μ m, the short diameter is 1-3 μ m, and the average powder diameter is 2-3 μ M. However, due to the surface treatment, after the light calcium is formed, dehydrated and dried, many particles often agglomerate together to form the same aggregates as grape Tulu. Therefore, the quality requirements of light calcium in the national standard are only judged from the 125 μ m and 45 μ m sieve residues, and do not directly reflect the real particle size and distribution.

The function of light calcium carbonate

The particle size of light calcium carbonate is smaller than that of heavy calcium carbonate, the oil absorption is larger than that of heavy calcium carbonate, and the price is higher than that of heavy calcium carbonate. They are commonly used in latex paint filler, with the use of. Light calcium is better in terms of sedimentation, but its oil absorption is larger than that of heavy calcium, and its price is generally higher than that of heavy calcium.

Usually used as filler, it is widely used in artificial floor tile, rubber, plastic, paper, coating, paint, ink, cable, building supplies, food, medicine, textile, feed, toothpaste and other daily chemical industries. As filler, it can increase product volume and reduce production cost.

Function and application of light calcium carbonate

Light calcium carbonate is widely used in the following industries:

Rubber industry: calcium carbonate is one of the earliest and largest fillers used in the rubber industry. A large amount of calcium carbonate is filled in the rubber, which can increase the volume of products, thus saving expensive natural rubber and achieving the purpose of reducing costs. Calcium carbonate filled rubber can obtain higher tensile strength, wear resistance, tear strength than pure rubber sulfide, and is widely used in natural rubber and synthetic rubber The rubber has a significant reinforcing effect and the consistency can be adjusted at the same time.

Plastic industry: 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 smoothness of products. Adding calcium carbonate in general plastic products can improve the heat resistance. Because the whiteness of calcium carbonate is more than 90%, it can also replace the expensive white pigment and play a certain role in whitening.

Paint industry: the amount of calcium carbonate in the paint industry is large, and it is an indispensable skeleton. The amount of calcium carbonate in heavy paint is more than 30%, and that in phenolic enamel is 4-7%, and that in phenolic fine pattern wrinkle paint is more than 39%.

Water based coating industry: it is widely used in the water-based coating industry. It can make the coating non settling, easy to disperse, good gloss and other characteristics. The dosage of water-based coating is 20-60%.

In addition, calcium carbonate plays an important role in the paper industry, which can improve the strength, whiteness and low cost of paper. In the cable industry can play a certain role in insulation.