CN104403033A - Preparation method of polyvinylidene fluoride - Google Patents

Abstract

The invention discloses a preparation method of polyvinylidene fluoride. The preparation method comprises the following steps: (1) putting 1.3 parts of hydrogen peroxide and 2.1 parts of inorganic alkali solution by weight in a reaction kettle, uniformly mixing, then putting 8.9 parts of 1,2,2-trifluoro-1,1,2-trichloroethane solvent and 1.3 parts of undecafluoro-hexanoyl fluoride solution by weight, and stirring at 8 DEG C below zero for 35-minute reaction; (2) then introducing 5.5 parts of a polyglycol solution, 83 parts of vinylidene fluoride monomers and 3.1 parts of methylcyclopentane by weight, stirring at 32 DEG C for reaction, and ending the reaction when the pressure is reduced below 0.27 MPa; (3) filtering, washing and drying to obtain powered polyvinylidene fluoride. The prepared polyvinylidene fluoride has good heat stability and machinability, and can meet the production technology such as injection molding, extrusion and film drawing.

Description

The preparation method of polyvinylidene difluoride (PVDF)

Technical field

The present invention relates to the preparation method of polyvinylidene difluoride (PVDF).

Background technology

Existing vinylidene material, its thermostability and workability have much room for improvement, and are not particularly well positioned to meet injection moulding, extrude and the production technique such as membrane.

Summary of the invention

The object of the present invention is to provide a kind of preparation method of polyvinylidene difluoride (PVDF), its vinylidene prepared has good thermostability and workability, can meet injection moulding, extrude and the production technique such as membrane.

For achieving the above object, technical scheme of the present invention designs a kind of preparation method of polyvinylidene difluoride (PVDF), comprises the steps:

1) drop into 1.3 weight part hydrogen peroxide, 2.1 parts by weight of inorganic alkaline solutions in reactor, mix, then drop into the fluoro-vinyl trichloride solvent of 8.9 weight part 1,2,2-tri-, 1.3 weight part 11 fluorine hexanoyl fluorine solution ,-8 DEG C of stirring reactions 35 minutes;

2) pass into 5.5 weight part polyglycol solutions, 83 weight part vinylidene fluoride monomers, 3.1 weight part methylcyclopentanes again, at 32 DEG C of stirring reactions, pressure drop is to termination reaction during below 0.27MPa;

3) filtration, washing, drying, obtain Powdered polyvinylidene difluoride (PVDF).

Advantage of the present invention and beneficial effect are: the preparation method providing a kind of polyvinylidene difluoride (PVDF), and its vinylidene prepared has good thermostability and workability, can meet injection moulding, extrude and the production technique such as membrane.

Embodiment

Below in conjunction with embodiment, the specific embodiment of the present invention is further described.Following examples only for technical scheme of the present invention is clearly described, and can not limit the scope of the invention with this.

The technical scheme that the present invention specifically implements is:

A preparation method for polyvinylidene difluoride (PVDF), comprises the steps:

1) drop into 1.3 weight part hydrogen peroxide, 2.1 parts by weight of inorganic alkaline solutions in reactor, mix, then drop into the fluoro-vinyl trichloride solvent of 8.9 weight part 1,2,2-tri-, 1.3 weight part 11 fluorine hexanoyl fluorine solution ,-8 DEG C of stirring reactions 35 minutes;

2) pass into 5.5 weight part polyglycol solutions, 83 weight part vinylidene fluoride monomers, 3.1 weight part methylcyclopentanes again, at 32 DEG C of stirring reactions, pressure drop is to termination reaction during below 0.27MPa;

3) filtration, washing, drying, obtain Powdered polyvinylidene difluoride (PVDF).

 

The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (1)

1. the preparation method of polyvinylidene difluoride (PVDF), is characterized in that, comprises the steps:

1) drop into 1.3 weight part hydrogen peroxide, 2.1 parts by weight of inorganic alkaline solutions in reactor, mix, then drop into the fluoro-vinyl trichloride solvent of 8.9 weight part 1,2,2-tri-, 1.3 weight part 11 fluorine hexanoyl fluorine solution ,-8 DEG C of stirring reactions 35 minutes;

2) pass into 5.5 weight part polyglycol solutions, 83 weight part vinylidene fluoride monomers, 3.1 weight part methylcyclopentanes again, at 32 DEG C of stirring reactions, pressure drop is to termination reaction during below 0.27MPa;

3) filtration, washing, drying, obtain Powdered polyvinylidene difluoride (PVDF).