High-temperature-resistant modified calcium carbonate and preparation method thereof

Abstract

The invention discloses high-temperature-resistant modified calcium carbonate which is characterized by being prepared from following raw materials including, by weight, 85-90 parts of calcium carbonate, 3-4 parts of cationic starch, 1-2 parts of glutinous rice glue, 3-5 parts of magnesium hydroxide, 1-2 parts of bamboo charcoal powder, 3-4 parts of dried fallen leaf powder, 2-3 parts of barium sulfate, 5-7 parts of polyimide, 1-2 parts of polybenzimidazole, 3-5 parts of hydroxyethyl acrylate, 4-6 parts of dimethylformamide, 2-4 parts of sodium sulfide, 2-3 parts of sepiolite fibre and 3-4 parts of modified titanium dioxide. Through addition of the modified titanium dioxide, dispersibility of the calcium carbonate is enhanced. Through addition of the polyimide for coating the calcium carbonate, the calcium carbonate not only has a high-temperature-resistant performance but also is good in compatibility. A crosslinking reaction can be carried out between the polyimide and a film-forming substance in rubber, plastic and coating so that a very strong binding force is generated and product performance is not reduced. Through addition of the sepiolite fibre, the modified calcium carbonate is excellent in thermal-stability, can be decomposed naturally and is safe and environment-protective.

Description

technical field [0001] The invention relates to the field of industrial fillers, in particular to a high-temperature-resistant modified calcium carbonate and a preparation method thereof. Background technique [0002] Calcium carbonate is a very important functional inorganic filler, which is widely used in industrial fields such as plastics, rubber, coatings and papermaking. In the application field of calcium carbonate, most products belong to the category of polymers, such as plastics, rubber, adhesives, coatings, etc., and occupy an important market share. Taking plastics as an example, the market usage of PCC in plastics will reach 3.5 million tons. Compared with metal materials, polymer materials are widely used in many fields due to their advantages of light weight, easy processing, and good specific strength. However, compared with metal materials, one of the outstanding disadvantages of polymers is that they are poor in heat resistance. For this reason, many polym...

AI Technical Summary

Problems solved by technology

However, compared with metal materials, one of the outstanding disadvantages of polymers is that they are poor in heat resistance. For this reason, many polymers with better heat resistance have been gradually developed and used in high-end applications such as automobiles, electronics, and aerospace. The field has been widely used

However, the addition of dispersants and surface modifiers greatly reduces the temperature window of nano-calcium carbonate, because commonly used dispersants and coupling agents are easy to decompose at high temperatures, causing bubbles, cracks, defects, deformation, etc., thus Affect the appearance, heat resistance and mechanical properties of materials

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