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Green preparation method of cationic type polyvinyl chloride membrane material

A technology of vinyl chloride and a new method, which is applied in the field of green preparation of cationic polyvinyl chloride membrane materials, can solve the problems of low polymerization activity and limited space for chemical modification, and achieve mild and controllable conditions, broaden the development space, and low energy consumption effect

Active Publication Date: 2017-03-22
NINGBO UNIV
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  • Claims
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Problems solved by technology

Vinyl chloride is a monomer with low polymerization activity, and it is rarely copolymerized with other olefin monomers, which greatly limits the space for chemical modification through copolymerization.

Method used

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  • Green preparation method of cationic type polyvinyl chloride membrane material
  • Green preparation method of cationic type polyvinyl chloride membrane material
  • Green preparation method of cationic type polyvinyl chloride membrane material

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Embodiment Construction

[0021] Below in conjunction with embodiment the present invention is described in further detail.

[0022] The preparation of vinyl chloride / dimethyl diallyl ammonium chloride copolymer is carried out in the following steps:

[0023] a. Dissolve 1.5g cationic surfactant initiator in 500mL water, the concentration is generally in the range of 2.5-3.0‰, the amount of initiator is generally 2.5-3.0% of the weight of vinyl chloride, by adding different amounts of acetic acid and sodium phosphate mixture Adjust the pH value of the aqueous solution (pH=9 to 10; pH=7 to 8; pH=4.5 to 5.0), place the aqueous solution in a closed high-pressure reactor, and pass nitrogen into the reactor to remove the internal air;

[0024] b. Inject 55g of oil-soluble monomer vinyl chloride (boiling point is -13.4°C) into the reactor, stir well at room temperature and then add a saturated solution of potassium persulfate (the amount of potassium persulfate is generally 1.0-1.5% of the weight of the inpu...

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Abstract

The invention provides a green preparation method of a vinyl chloride / dimethyl diallyl ammonium chloride copolymer which is used as a separating membrane material. The green preparation method is a copolymer synthesizing technology based on a water / oil two-phase interfacial free-radical polymerization. The green preparation method is characterized in that a cationic surface active initiator is specifically used and subjected to oxidation-reduction reaction with potassium persulfate under normal temperature; the oxidation-reduction reaction is repeated at a plurality of times so as to generate free radicals on an interface, and the independent polymerization reaction of vinyl chloride and dimethyl diallyl ammonium chloride is initiated; the two chain segments are connected in series through initiator molecules, thus obtaining a segmented copolymer. The experiment shows that when the pH of a water phase medium is 4.5 to 5, the rate of charge of monomer is consistent with the component ratio of the copolymer; the content of dimethyl diallyl ammonium chloride chain segment in the copolymer can be adjusted between 5-16wt.%; the polymerizing reaction under such mode is mild and controllable in condition, low in energy consumption, free of other organic solvents and emulsifiers, and pure in products, and completely meets the requirement of green chemistry.

Description

technical field [0001] The invention relates to the technical field of polymer material synthesis, in particular to a green preparation method of a cationic polyvinyl chloride membrane material. The copolymer is an amphiphilic polymer that can be used in the preparation of separation membrane materials. Its preparation method conforms to requirements of green chemistry. Background technique [0002] With the rapid development of membrane separation high-tech, its technology has been widely used in biological, medical and environmental engineering. In order to meet various separation requirements, the research work on the modification of membrane materials is very active at home and abroad, but mainly focuses on For some functional polymers with low output and high price, such as polysulfone, polyvinylidene fluoride, polyacrylonitrile, polysulfone amide, etc., and polyvinyl chloride is the second largest synthetic resin after polyethylene. It has the characteristics of low p...

Claims

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Application Information

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IPC IPC(8): C08F297/00C08F214/06C08F226/02C08F2/28B01D71/80
CPCB01D71/80C08F2/28C08F214/06C08F226/02C08F297/00
Inventor 靳鑫煜张瑞丰孙怀艳李赛赛陈胜江峰肖通虎龙能兵
Owner NINGBO UNIV
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