Diethylene-glycol-phthalic-anhydride-polymer microencapsulated red phosphorus flame retardant product and preparation method thereof

Abstract

The invention provides a diethylene-glycol-phthalic-anhydride-polymer microencapsulated red phosphorus flame retardant product and a preparation method thereof. According to the product, the surfacesof the red phosphorus particles are coated with a diethylene-glycol-phthalic-anhydride-polymer coating layer. The preparation method uses phthalic anhydrides, polyols and red phosphorus as raw materials to obtain the product. The method includes the following steps that after mixed, the phthalic anhydrides, the polyols and red phosphorus are placed in high-energy crushing equipment, and mixing andcrushing are conducted under nitrogen protection; 2, during heating and stirring and under the nitrogen protection, the phthalic anhydrides and the polyols react on the surfaces of the red phosphorusparticles under catalytic conditions to generate a diethylene-glycol-phthalic-anhydride-polymer coating layer; 3, during stirring and under the nitrogen protection, materials obtained in the step 2 are cooled, and a diethylene-glycol-phthalic-anhydride-polymer coated microencapsulated red phosphorus product is obtained. The process is a dry preparation method, no complicated operations such as sol-gel, filtration, washing and drying in a conventional wet coating process are needed, the technological process is short, and the operation is simple and economical. No sewage is generated in the process, and the product is safe, economical and easy to industrialize.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and relates to a red phosphorus flame retardant product microencapsulated with phthalic anhydride polyester polyol and a preparation method thereof. Background technique [0002] Red phosphorus flame retardant can react with the oxygen in the material in the event of a fire to generate phosphoric acid, metaphosphoric acid, polymetaphosphoric acid, etc., which can carbonize the surface of the polymer to form a carbon film, and polymetaphosphoric acid is covered in a viscous liquid state. On the surface of unburned materials, this solid or liquid film can not only prevent free radicals from escaping, but also isolate oxygen, thereby playing a flame-retardant role. Therefore, red phosphorus flame retardants are suitable for flame retardancy of polymers, especially Flame retardant for oxygenated polymers. [0003] Among the additive flame retardants, red phosphorus is a substance that may ...

AI Technical Summary

Problems solved by technology

The stability of red phosphorus treated with inorganic coating is greatly improved compared with that of uncoated red phosphorus, but the water absorption, pH 3 There are still problems in the amount of occurrence and compatibility with polymers: because inorganic substances exist on the surface of red phosphorus particles in the form of precipitation, their binding force is weak, and the coating layer is easy to be used in the process of flame retardants being applied to plastic processing. Breakage occurs, affecting the relevant properties of the final plastic product

The particle size of the coated red phosphorus is also limited by the filtration operation like the inorganic coating, and the too fine particle size or the very fine part contained in the red phosphorus slurry is prone to percolation during filtration and washing, which also causes the loss of red phosphorus

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