With the increasingly widespread application of flammable polymer materials, the demand for flame retardants has greatly increased.
Compared with organic flame retardants, inorganic flame retardants have the advantages of low production cost, high flame retardant efficiency and low environmental pollution, etc. However, inorganic flame retardants have low compatibility with polymer materials, have a great impact on the mechanical properties of materials, and usually must be modified to achieve a better flame retardant effect. Therefore, the search for effective improvement of the compatibility of flame retardants and the promotion of good modification methods is the necessary research for the development of inorganic flame retardants. At present, the main varieties of inorganic flame retardants are aluminum hydroxide, magnesium hydroxide, inorganic phosphorus compounds, borates, antimony oxide, molybdenum compounds, etc. The most researched flame retardant modification methods of magnesium hydroxide are flame retardant microencapsulation, flame retardant ultra-fine, flame retardant surface modification.
I. Microencapsulation of flame retardants magnesium hydroxide
Microencapsulation technology refers to the use of polymer materials wrapped solid, gas or liquid into a tiny capsule with a shell and core structure of 1 μm to 5000 μm in diameter. The characteristics of microencapsulation technology are that microcapsules can morphologically transform liquids and gases into solids, giving the core material new physical properties; the capsule wall can play a role in isolation and protection, allowing the stable coexistence of substances that can easily react with each other, while shielding colored, tasty or toxic substances; the core material can be released in a controlled manner as needed.
The main preparation methods of flame retardant microcapsules include interfacial polymerization, in situ polymerization, phase separation, solution evaporation, sol-gel method, etc...
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