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Method for preparing hydrophilic polyvinylidene fluoride membrane materials in green manner

A technology of vinylidene fluoride and a new method is applied in the field of green preparation of hydrophilic polyvinylidene fluoride membrane materials, which can solve the problems of low polymerization activity and limited space for chemical modification, and achieve pure product and mild polymerization reaction conditions. Controllable, low-energy effects

Active Publication Date: 2017-03-15
NINGBO UNIV
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  • Abstract
  • Description
  • Claims
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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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  • Method for preparing hydrophilic polyvinylidene fluoride membrane materials in green manner
  • Method for preparing hydrophilic polyvinylidene fluoride membrane materials in green manner
  • Method for preparing hydrophilic polyvinylidene fluoride membrane materials in green manner

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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 of gemini-type surfactant initiator in 500mL of 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 sodium phosphate The mixture is used 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 gas 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 saturate afte...

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Abstract

The invention relates to a method for preparing vinylidene fluoride / N, N-dimethylacrylamide copolymers in a green manner. The vinylidene fluoride / N, N-dimethylacrylamide copolymers are used as separation membrane materials. The method has the advantages that the method is a copolymer synthesis technology based on water / oil two-phase interfacial free radical polymerization, oxidation-reduction reaction is carried out by special Gemini surface active initiators and potassium persulfate at the normal temperature, free radicals are repeatedly generated on interfaces, independent polymerization reaction between vinylidene fluoride and N, N-dimethylacrylamide is initiated, two types of chain segments are connected with each other by initiator molecules in series to form the segmented copolymers, the feed ratios of monomers are extremely consistent with component ratios of the copolymers when pH (potential of hydrogen) values of water-phase media are within the ranges of 4.0-4.5 as proved by experiments, the content of N, N-dimethylacrylamide chain segments in the copolymers is adjustable in the ranges of 5-25 wt.%, polymerization reaction conditions in the modes are mild and controllable, the method is low in energy consumption, other organic solvents or emulsifiers can be omitted, products are pure, and requirements on green chemistry can be completely met.

Description

technical field [0001] The invention relates to the technical field of polymer material synthesis, in particular to a green method for preparing a hydrophilized polyvinylidene fluoride membrane material. The copolymer is an amphiphilic polymer that can be used for the preparation of separation membrane materials. Its preparation The method meets 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-containin...

Claims

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Application Information

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IPC IPC(8): C08F293/00C08F220/54C08F4/40
CPCC08F4/40C08F220/54C08F293/005
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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