Method for preparing brominated polypropylene
A technology of brominated polypropylene and polypropylene, which is applied in the field of preparation of brominated polypropylene, can solve the problems that the degree of bromination is not easy to control, and achieve the effect of simple and easy preparation method
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Embodiment 1
[0019] Add 800ml of pure water and 200ml of bromine into the reaction flask with a stirring and condenser tube, heat the reaction flask to 60°C, and add 50g of isotactic polypropylene (molecular weight: 150,000) with a particle size of 120 meshes after the temperature is constant. Turn on the ultraviolet lamp (700W), keep the temperature and stir the reaction for 80min. During the reaction process, the generated hydrogen bromide is introduced into the absorption bottle equipped with acetic acid through the condenser tube for absorption. After the reaction is finished, filter out the product, wash the product with water until there is no bromide ion and the pH value of the washing solution is 7, and then dry it to constant weight at 70°C to obtain a brominated polypropylene product with a bromine content of 32% (Wt%) . The filtered filtrate was distilled at 60°C to recover bromine.
Embodiment 2
[0021] Add 800ml of pure water and 200ml of bromine into the reaction flask with a stirring and condenser tube, heat the reaction flask to 60°C, and add 50g of isotactic polypropylene (molecular weight: 150,000) with a particle size of 120 meshes after the temperature is constant. Turn on the ultraviolet lamp (700W), keep the temperature and stir for 100min. During the reaction process, the generated hydrogen bromide is introduced into the absorption bottle equipped with acetic acid through the condenser tube for absorption. After the reaction is finished, filter out the product, wash the product with water until there is no bromide ion and the pH value of the washing solution is 7, and then dry it to constant weight at 70°C to obtain a brominated polypropylene product with a bromine content of 56% (Wt%) . The filtered filtrate was distilled at 60°C to recover bromine.
Embodiment 3
[0023] Add 800ml of pure water and 200ml of bromine together into a reaction flask with a stirring and cooling tube, heat the reaction flask to 40°C, and add 50g of isotactic polypropylene (molecular weight: 250,000) with a particle size of 180 meshes after the temperature is constant. Turn on the ultraviolet lamp (700W), keep the temperature and stir the reaction for 60min. During the reaction process, the generated hydrogen bromide is introduced into the absorption bottle equipped with acetic acid through the condenser tube for absorption. After the reaction is finished, filter out the product, wash the product with water until there is no bromide ion and the pH value of the washing solution is 7, and then dry it to constant weight at 70°C to obtain a brominated polypropylene product with a bromine content of 22% (Wt%) . The filtered filtrate was distilled at 60°C to recover bromine.
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