CN104497180A - Production method of polyvinylidene fluoride with thermal stability - Google Patents

Abstract

The invention discloses a production method of polyvinylidene fluoride with thermal stability. The production method comprises the following steps of (1)adding 1.7 parts of hydrogen peroxide and 3.1 parts of an inorganic alkaline solution into a reaction kettle, uniformly mixing, then, adding 14.3 parts of a dichlorofluoroethane solvent and 1.5 parts of a sulfonyl chloride solution, and reacting while stirring at the temperature of 2 DEG C below zero for 28 minutes; (2) introducing 5.8 parts of a sodium pyrophosphate solution, 93 parts of vinylidene fluoride monomers and 0.9 part of 1, 2-dimethylcyclopentane, reacting while stirring at the temperature of 18 DEG C, and stopping reacting when the pressure is reduced to less than 0.25MPa; and (3) filtering, washing and drying to obtain the powdery polyvinylidene fluoride. The polyvinylidene fluoride prepared by using the production method is favorable in thermal stability and processability and capable of meeting the requirements of production processes such as injection molding, extrusion and film drawing.

Description

The production method of thermostability polyvinylidene difluoride (PVDF)

Technical field

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

1) drop into 1.7 weight part hydrogen peroxide, 3.1 parts by weight of inorganic alkaline solutions in reactor, mix, then drop into 14.3 weight part chloro fluoroethane solvents, 1.5 weight part chloride solutions ,-2 DEG C of stirring reactions 28 minutes;

2) pass into 5.8 weight part sodium pyrophosphate solutions, 93 weight part vinylidene fluoride monomers, 0.9 weight part l again, 2-dimethylcyclopentane, at 18 DEG C of stirring reactions, pressure drop is to termination reaction during below 0.25MPa;

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

Advantage of the present invention and beneficial effect are: the production method providing a kind of thermostability 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 method for thermostability polyvinylidene difluoride (PVDF), comprises the steps:

1) drop into 1.7 weight part hydrogen peroxide, 3.1 parts by weight of inorganic alkaline solutions in reactor, mix, then drop into 14.3 weight part chloro fluoroethane solvents, 1.5 weight part chloride solutions ,-2 DEG C of stirring reactions 28 minutes;

2) pass into 5.8 weight part sodium pyrophosphate solutions, 93 weight part vinylidene fluoride monomers, 0.9 weight part l again, 2-dimethylcyclopentane, at 18 DEG C of stirring reactions, pressure drop is to termination reaction during below 0.25MPa;

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

1) drop into 1.7 weight part hydrogen peroxide, 3.1 parts by weight of inorganic alkaline solutions in reactor, mix, then drop into 14.3 weight part chloro fluoroethane solvents, 1.5 weight part chloride solutions ,-2 DEG C of stirring reactions 28 minutes;

2) pass into 5.8 weight part sodium pyrophosphate solutions, 93 weight part vinylidene fluoride monomers, 0.9 weight part l again, 2-dimethylcyclopentane, at 18 DEG C of stirring reactions, pressure drop is to termination reaction during below 0.25MPa;

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