In recent years, fire accidents caused by polymers have attracted great attention from all walks of life, and the research and development of flame-retardant polymers has become a hot topic. At present, organic flame retardants used in the market have hazards such as large smoke production and toxic smoke, which are subject to legal restrictions in Europe, the United States, Japan and my country. Therefore, inorganic flame retardants have received great attention.

Calcium carbonate is a common inorganic compound that widely exists in nature and is widely used in various industrial fields due to its diverse physical and chemical properties.

Calcium carbonate is a common inorganic compound that widely exists in nature and is widely used in various industrial fields due to its diverse physical and chemical properties.

Magnesium hydroxide (Mg(OH)₂) is a white crystal or powder with weak alkalinity and hygroscopicity. The part soluble in water is completely ionized, and the saturated solution concentration is 1.9 mg/L (18°C). Its preparation methods include brucite grinding method and chemical synthesis method (such as calcium hydroxide method, ammonia method, sodium hydroxide method).

Calcium carbonate is an important inorganic salt with a wide range of uses. According to different processing methods, it is mainly divided into heavy calcium carbonate (referred to as heavy calcium) and light calcium carbonate (referred to as light calcium). Whether it is heavy calcium or light calcium, calcium carbonate is the most widely used powder filler in plastics, rubber, papermaking and other industries.