CN104497181A - Preparation process of polyvinylidene fluoride - Google Patents

Abstract

The invention discloses a preparation process of polyvinylidene fluoride. The preparation process comprises the following steps of (1) adding 2.1 parts of hydrogen peroxide and 1.8 parts of an inorganic alkaline solution into a reaction kettle, uniformly mixing, then, adding 11.3 parts of a dichlorodifluoromethane solvent and 0.2 part of a perfluorobutanesulforyl fluoride solution, and reacting while stirring at the temperature of 6 DEG C below zero for 30 minutes; (2) introducing 6.7 parts of a polypropylene glycol solution, 72 parts of vinylidene fluoride monomers and 2.5 parts of isopropylcyclopentane, reacting while stirring at the temperature of 35 DEG C, and stopping reacting when the pressure is reduced to be less than 0.21MPa; and (3) filtering, washing and drying to obtain the powdery polyvinylidene fluoride. The polyvinylidene fluoride prepared by using the preparation process 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 preparation technology of polyvinylidene difluoride (PVDF)

Technical field

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

1) drop into 2.1 weight part hydrogen peroxide, 1.8 parts by weight of inorganic alkaline solutions in reactor, mix, then drop into 11.3 weight part Refrigerant 12 solvents, 0.2 weight part perfluoro butyl sulfonic acid fluoride solution ,-6 DEG C of stirring reactions 30 minutes;

2) pass into 6.7 weight part polypropylene glycol solution, 72 weight part vinylidene fluoride monomers, 2.5 weight part isopropyl cyclopentane again, at 35 DEG C of stirring reactions, pressure drop is to termination reaction during below 0.21MPa;

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

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

1) drop into 2.1 weight part hydrogen peroxide, 1.8 parts by weight of inorganic alkaline solutions in reactor, mix, then drop into 11.3 weight part Refrigerant 12 solvents, 0.2 weight part perfluoro butyl sulfonic acid fluoride solution ,-6 DEG C of stirring reactions 30 minutes;

2) pass into 6.7 weight part polypropylene glycol solution, 72 weight part vinylidene fluoride monomers, 2.5 weight part isopropyl cyclopentane again, at 35 DEG C of stirring reactions, pressure drop is to termination reaction during below 0.21MPa;

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

1) drop into 2.1 weight part hydrogen peroxide, 1.8 parts by weight of inorganic alkaline solutions in reactor, mix, then drop into 11.3 weight part Refrigerant 12 solvents, 0.2 weight part perfluoro butyl sulfonic acid fluoride solution ,-6 DEG C of stirring reactions 30 minutes;

2) pass into 6.7 weight part polypropylene glycol solution, 72 weight part vinylidene fluoride monomers, 2.5 weight part isopropyl cyclopentane again, at 35 DEG C of stirring reactions, pressure drop is to termination reaction during below 0.21MPa;

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