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

Inactive Publication Date: 2012-09-19
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, brominated polypropylene is made by reacting polypropylene with bromine gas and an initiator under

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention discloses a method for preparing brominated polypropylene. The method comprises the following steps of: 1) mixing polypropylene, water and an excessive amount of bromine, and stirring uniformly, wherein the weight ratio of polypropylene to water is (1:9)-(3:7); 2) reacting with stirring under the condition of ultraviolet irritation and/or adding of an initiating agent at the temperature of between 30 and 60 DEG C for 60 to 360 minutes; 3) after reaction, separating brominated polypropylene out. According to the method, polypropylene and bromine react in water under irritation of light, reaction conditions are optimized, the irritation of ultraviolet of which the wavelength is 280 to 460nm is used for initiating, the reaction temperature of between 30 and 50 DEG C is used, and parameters such as a mixing ratio of polypropylene to water are adopted, so that polypropylene and bromine react smoothly to obtain brominated polypropylene, the bromine content of the brominated polypropylene is correspondingly increased along with the increasing of reaction time in the reaction time of 60 to 360 minutes, and the bromination progress of brominated polypropylene can be controlled.

Description

technical field [0001] The invention relates to a preparation method of brominated polypropylene, which belongs to the technical field of polymer synthesis. Background technique [0002] Polypropylene (PP) is a thermoplastic with carbon-carbon and carbon-hydrogen saturated bonds in its molecular structure, so it has excellent electrical insulation and chemical stability. However, its mechanical properties are poor, especially low-temperature impact strength. At the same time, because the molecule is composed of carbon and hydrogen atoms and has no polar groups, it makes its dyeability, flame retardancy, heat resistance, and compatibility with other materials The adhesiveness of PP is very poor, therefore, the scope of application of PP is limited. PP can introduce polar groups on its main chain by grafting method, or use chlorine gas to react with PP to prepare chlorinated polypropylene. The former has complex reactions, high cost, and less polar groups introduced; the lat...

Claims

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Application Information

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IPC IPC(8): C08F10/06C08F8/22
Inventor 张玉清刘秋菊刘泽民赫玉欣姚大虎卢敏
Owner HENAN UNIV OF SCI & TECH
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