CN104448077A - Production process of polyvinylidene fluoride - Google Patents

Abstract

The invention discloses a production process of polyvinylidene fluoride. The production process comprises the following steps of (1) adding 3.2 parts by weight of hydrogen peroxide and 3.4 parts by weight of an inorganic alkali solution into a reaction kettle, uniformly mixing, then, adding 6.7 parts by weight of a monofluorodichloroethane solvent and 0.6 part by weight of a bromodifluoroacetyl fluoride solution, and reacting at the temperature of 7 DEG C below zero for 40 minutes by stirring; (2) introducing 1.6 parts by weight of a sodium hexametaphosphate solution, 93 parts by weight of vinylidene fluoride monomers and 2.4 parts by weight of 2-methyl-1-ethyl cyclopentane, reacting at the temperature of 27 DEG C by stirring, and stopping reacting when the pressure is reduced to be smaller than 0.29MPa; and (3) filtering, washing and drying to obtain powdery polyvinylidene fluoride. Polyvinylidene fluoride prepared by using the production process is favorable in thermal stability and processibility and capable of meeting the requirements of production processes such as injection molding, extruding and film drawing.

Description

The production technique of polyvinylidene difluoride (PVDF)

Technical field

The present invention relates to the production technique 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 production technique 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 production technique of polyvinylidene difluoride (PVDF), comprises the steps:

1) drop into 3.2 weight part hydrogen peroxide, 3.4 parts by weight of inorganic alkaline solutions in reactor, mix, then drop into 6.7 weight part one fluorine dichloroethane solvent, 0.6 weight part difluoro acetobrom fluorine solution ,-7 DEG C of stirring reactions 40 minutes;

2) pass into 1.6 weight part sodium hexametaphosphate solutions, 93 weight part vinylidene fluoride monomers, 2.4 weight part 2-methyl isophthalic acid-ethyl group pentamethylene again, at 27 DEG C of stirring reactions, pressure drop is to termination reaction during below 0.29MPa;

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

Advantage of the present invention and beneficial effect are: the production technique 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 production technique for polyvinylidene difluoride (PVDF), comprises the steps:

1) drop into 3.2 weight part hydrogen peroxide, 3.4 parts by weight of inorganic alkaline solutions in reactor, mix, then drop into 6.7 weight part one fluorine dichloroethane solvent, 0.6 weight part difluoro acetobrom fluorine solution ,-7 DEG C of stirring reactions 40 minutes;

2) pass into 1.6 weight part sodium hexametaphosphate solutions, 93 weight part vinylidene fluoride monomers, 2.4 weight part 2-methyl isophthalic acid-ethyl group pentamethylene again, at 27 DEG C of stirring reactions, pressure drop is to termination reaction during below 0.29MPa;

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 production technique of polyvinylidene difluoride (PVDF), is characterized in that, comprises the steps:

1) drop into 3.2 weight part hydrogen peroxide, 3.4 parts by weight of inorganic alkaline solutions in reactor, mix, then drop into 6.7 weight part one fluorine dichloroethane solvent, 0.6 weight part difluoro acetobrom fluorine solution ,-7 DEG C of stirring reactions 40 minutes;

2) pass into 1.6 weight part sodium hexametaphosphate solutions, 93 weight part vinylidene fluoride monomers, 2.4 weight part 2-methyl isophthalic acid-ethyl group pentamethylene again, at 27 DEG C of stirring reactions, pressure drop is to termination reaction during below 0.29MPa;

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