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Green preparation method of cationic type PVDF (Polyvinylidene Fluoride) membrane material

A technology of vinylidene fluoride and a new method, which is applied in the field of green preparation of cationic polyvinylidene fluoride membrane materials, can solve the problems of low polymerization activity and limited space for chemical modification, and achieve pure products and mild and stable polymerization conditions. control, low energy consumption

Active Publication Date: 2017-03-15
NINGBO UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Vinylidene fluoride is a monomer with low polymerization activity, and it is rarely copolymerized with functional olefin monomers, which greatly limits the space for chemical modification by means of copolymerization

Method used

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  • Green preparation method of cationic type PVDF (Polyvinylidene Fluoride) membrane material
  • Green preparation method of cationic type PVDF (Polyvinylidene Fluoride) membrane material
  • Green preparation method of cationic type PVDF (Polyvinylidene Fluoride) membrane material

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Embodiment Construction

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

[0022] Vinylidene fluoride / dimethyl diallyl ammonium chloride copolymer is prepared according to the following steps:

[0023] a. Dissolve 1.5g Gemini-type 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 vinylidene fluoride, by adding different amounts of acetic acid and phosphoric acid Sodium mixture to adjust the pH value of the aqueous solution (pH = 9 ~ 10; pH = 7 ~ 8; pH = 4.0 ~ 4.5), the aqueous solution is placed in a closed high-pressure reactor, and nitrogen is passed into the reactor to remove the internal air ;

[0024] b. Inject 55g of oil-soluble monomer vinylidene fluoride (boiling point at 0.1MPa is -84°C) into the reactor, maintain a pressure of 5.5MPa at room temperature, keep the monomer in a liquid state, and add potassium persulfate to satura...

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Abstract

The invention relates to a green preparation method of a cationic type PVDF (Polyvinylidene Fluoride) membrane material. The green preparation method is based on a copolymer synthetic technology formed by water / oil two-phase interface free radical polymerization, a Gemini type cationic surface activity initiator is specifically used so as to be in redox reaction with potassium persulfate, free radicals can be generated on an interface through multiple replication, a polymerization reaction of vinyl fluoride and dimethyl diallyl ammonium chloride is initiated, and two chain segments are connected together in series through initiator molecules to form a poly-segment copolymer. An experiment verifies that when the pH (Potential of Hydrogen) value of an aqueous medium is ranged from 4.0 to 4.5, a feed ratio of monomers and a composition ratio of the copolymer is very consistent, and the content of a dimethyl diallyl ammonium chloride chain segment in the copolymer is ranged from 5 wt percent to 25 wt percent and can be regulated; the polymerization reaction in the mode has mild and controllable condition and low energy consumption, other organic solvents and emulsifiers are not used, the product is pure, and the requirements of green chemistry are completely met.

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 polyvinylidene fluoride membrane material. The copolymer is an amphiphilic polymer that can be used for the preparation of separation membrane materials. Its preparation method Meet the requirements of green chemistry. Background technique [0002] Polyvinylidene fluoride (PVDF) resin mainly refers to a homopolymer of vinylidene fluoride or a copolymer of vinylidene fluoride and a small amount of other fluorine-containing vinyl monomers. PVDF resin has the characteristics of both fluororesin and general-purpose resin. In addition to chemical corrosion resistance, high temperature resistance, oxidation resistance, weather resistance, and radiation resistance, it also has special properties such as piezoelectricity, dielectricity, and pyroelectricity. It is currently the second largest output of fluorine-containing plastic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F214/22C08F226/02C08F2/16
CPCC08F2/16C08F214/22C08F226/02
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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