Modified calcium carbonate and preparation method thereof

Abstract

The invention discloses modified calcium carbonate and a preparation method thereof. The modified calcium carbonate is characterized by being prepared from the following raw materials in parts by weight: 100-150 parts of calcium carbonate, 30-50 parts of sodium oleate, 0.3-0.7 part of sodium dodecyl benzene sulfonate, 1-3 parts of sodium bicarbonate, 4-8 parts of styrene, 0.02-0.05 part of potassium persulfate, 3-5 parts of fumed silica, 2-3 parts of organic bentonite, 2-3 parts of polyimide, 0.4-1 part of ammonium bicarbonate, 2-4 parts of high abrasion furnace black and a proper amount of deionized water. The added polyimide, ammonium bicarbonate and high abrasion furnace black are combined with calcium carbonate to enable calcium carbonate to be wear-resistant in surface, lipophilic and hydrophobic, and have the fire-extinguishing property and other properties, the modified calcium carbonate has relatively good compatibility with polymers, and the interface effect is enhanced. The modified calcium carbonate has the advantages of simple modification process, relatively low cost, zero pollution, easy popularization and wide application prospect.

Description

technical field [0001] The invention relates to the field of industrial fillers, in particular to a modified calcium carbonate and a preparation method thereof. Background technique [0002] As a filler for rubber and plastic products, calcium carbonate can improve the heat resistance, wear resistance, dimensional stability, rigidity and processability of the product, and reduce the cost of the product, but its surface has hydroxyl groups with strong hydrophilicity. It presents a strong alkalinity. This hydrophilic and oleophobic property makes the affinity between calcium carbonate and organic polymers poor, and it is easy to form aggregates, resulting in uneven dispersion in the polymer, resulting in two materials. The effect of direct application is not good, and calcium carbonate is used as a filler, and its acid resistance, smoothness, whiteness and other properties need to be further improved. Therefore, in order to improve the reinforcing effect of calcium carbonate ...

AI Technical Summary

Problems solved by technology

[0002] As a filler for rubber and plastic products, calcium carbonate can improve the heat resistance, wear resistance, dimensional stability, rigidity and processability of the products, and reduce the cost, but its surface has a strong hydrophilic hydroxyl group, showing a strong alkalinity. This hydrophilic and oleophobic property makes the affinity between calcium carbonate and organic polymers poor, and it is easy to form aggregates, resulting in Partially dispersed in the polymer is not uniform, resulting in interface defects between the two materials, the direct application effect is not good, and calcium carbonate as a filler, its acid resistance, smoothness, whiteness and other properties need to be further improved, therefore, in order to To improve the reinforcing effect of calcium carbonate and the dispersion performance in composite materials and the physical properties of modified calcium carbonate filled composite materials, it is necessary to use different surface modifiers and treatment methods to modify the surface of calcium carbonate powder, and then broaden the Application fields of calcium carbonate