Green preparing method of anionic polyvinylidene fluoride membrane material

A technology of vinylidene fluoride and a new method, which is applied in the field of green preparation of anionic polyvinylidene fluoride membrane materials, can solve the problems of limited chemical modification space, low polymerization activity, etc., and achieves mild and controllable polymerization reaction conditions and products. The effect of purity and widening development space

Active Publication Date: 2017-03-29
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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  • Green preparing method of anionic polyvinylidene fluoride membrane material
  • Green preparing method of anionic polyvinylidene fluoride membrane material
  • Green preparing method of anionic 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 of gemini-type anionic 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 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 s...

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Abstract

The invention relates to a green preparing method of vinylidene fluoride / acrylic copolymer which is used as a separating membrane material. A copolymer synthetic technique is formed based on polymerization of free radicals in aqueous / oil two phase interface, a gemini type anionic surface activity initiator is specially used to be subjected to redox reaction with potassium persulfate at normal temperature, generation of free radicals in the interface is repeated for a lot of times, an independent polymerization reaction between vinylidene fluoride and acrylic acid is triggered, and a multi-segment copolymer is formed by connecting two kinds of chain segments through a initiator molecular. Experiments show that when a pH value of an aqueous-phase medium is in the range of 4.0-4.5, the material feeding ratio of a monomer coincides exactly with a component ratio of the copolymer, the content of acrylic chain segments in the copolymer is adjustable in the range of 5-25 wt.%, and the polymerization reaction in this mode is mild and controllable in condition, and low in energy consumption; meanwhile, other organic solvents and emulgators are not needed, products are pure, and the thus the preparing method of the anionic polyvinylidene fluoride membrane material totally conforms to demands for 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 an anionic 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): C08F293/00C08F4/40
CPCC08F4/40C08F293/00
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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