Preparation method of microencapsulated gradient halogen-free flame retardant system

Abstract

The invention relates to a preparation method of a microencapsulated gradient halogen-free flame retardant system. The preparation method comprises the steps of: mixing a phosphorus-series flame retardant with an inorganic flame retardant according to a certain ratio to obtain a microencapsulated halogen-free flame retardant, then carrying out surface modification on a charring agent, and then mixing the microencapsulated halogen-free flame retardant, a phosphorus-containing organic flame retardant and surface-modified charring agent according to a certain ratio to obtain the microencapsulated gradient halogen-free flame retardant system. By using the system, distributed gradient flame retarding is realized, the flame retardancy of a polymer material is greatly improved, the defect that compatibility between the flame retardant and the polymer is poor is solved, the migration of the halogen-free flame retardant from the polymer matrix under high-temperature and moisture conditions is significantly reduced, and the long-term storage of a flame-retardant polymer material is facilitated. The method has the characteristics of simple process, convenience for operation, environmental friendliness, and lower cost. The obtained flame retardant system has good flame retarding effect and wide application field.

Description

technical field [0001] The invention relates to a composite material, especially a preparation method of a microencapsulated gradient halogen-free flame retardant system with excellent flame retardancy. Background technique [0002] Entering the 21st century, polymer materials have entered our lives and are widely used in many fields such as electricity, transportation, construction, and military industry. However, the vast majority of polymers are flammable. As long as they encounter a fire source, they will be ignited in the air and then burn. The molten droplets can also ignite other combustibles. They generate a lot of heat and high temperature during the combustion process, easily generate incompletely burned black smoke, and release toxic and corrosive gases, which brings difficulties to firefighting and lifesaving work. As the world's safety and fire prevention standards become increasingly stringent, the global flame retardant market demand has been increasing. The ...

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Problems solved by technology

[0003] At present, there are some deficiencies in existing flame retardants and flame retardant technology, which are mainly manifested in the following aspects: Although halogenated flame retardants have good flame retardant effects, the amount of flame retardants is small, and the compatibility with flame retardants Good and other advantages, but halogen-based flame retardants will produce harmful halogen and hydrogen halide gases during the combustion process, which seriously pollutes the atmosphere; halogen-free flame retardants have the advantages of environmental friendliness, but halogen-free flame retardant When the flame retardant has the same flame retardant effect as the halogen-based flame retardant, the amount of flame retardant used is large, and the compatibility between the halogen-free flame retardant and the flame retardant is poor, and it is easy to be removed from the flame retardant during storage or transportation. Precipitation in the middle, resulting in a decline in flame retardant performance; a single flame retardant can no longer fully meet the requirements of today's polymer flame retardant, and the synergistic effect of multiple flame retardants is an effective way to improve the performance of halogen-free flame retardants

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