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Preparation method of wide-distribution polyvinylidene fluoride

A polyvinylidene fluoride and vinylidene fluoride technology, applied in the field of preparation of fluorine-containing polymers, can solve the problems of low possibility of industrialization, narrow molecular weight distribution, poor processing performance, etc., and achieve high physical and mechanical properties, wide molecular weight distribution, The effect of good processability

Inactive Publication Date: 2015-05-06
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The product obtained by polymerization by this method has a very wide molecular weight distribution or a bimodal structure, but the polymerization temperature of this patent is high, and the industrialization possibility of adopting a DTBP initiator is small; U.S. Patent US3475396 describes a kind of Propyl ester (abbreviated as IPP) is an emulsion polymerization method in which initiator is used as an initiator and ethylene oxide is used as a chain transfer agent. The polymerization pressure is maintained by adding anaerobic deionized water to obtain a product with narrow molecular weight distribution and high mechanical properties, but the product has narrow molecular weight distribution and poor processability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In a 5L horizontal stainless steel jacketed and stirred polymerization reactor, add about 0.10wt% ammonium perfluorooctanoate and 0.03wt% paraffin wax accounting for the total mass of the monomers, and replace the nitrogen gas by vacuuming 5 times. The oxygen content in the kettle is lower than 20ppm, and the vinylidene fluoride monomer is added to maintain the system at an atmospheric pressure, the stirring is started, and the temperature is raised to a polymerization temperature of 75°C. 18.75wt% VDF monomer accounting for the total mass of the monomer was introduced to make the pressure of the reactor 4.50MPa. Add the IPP initiator solution with a volume fraction of 6.50% to the reactor through a parallel flow pump. Within 10 minutes of the polymerization reaction, the pressure drop was 0.07MPa, and the VDF monomer was continuously added to maintain the system pressure at 4.50MPa, and a certain amount of IPP initiator solution was supplemented to maintain a certain p...

Embodiment 2

[0033]In a 5L horizontal stainless steel jacketed and stirred polymerization reactor, add about 0.10wt% ammonium perfluorooctanoate and 0.03wt% paraffin wax accounting for the total mass of the monomers, and replace the nitrogen gas by vacuuming 5 times. The oxygen content in the kettle is lower than 20ppm, and the vinylidene fluoride monomer is added to maintain the system at an atmospheric pressure, the stirring is started, and the temperature is raised to a polymerization temperature of 80°C. 18.75wt% VDF monomer accounting for the total mass of the monomer was introduced to make the pressure of the reactor 4.50MPa. Add the IPP initiator solution with a volume fraction of 6.50% to the reactor through a parallel flow pump. Within 10 minutes of the polymerization reaction, the pressure drop was 0.07MPa, and the VDF monomer was continuously added to maintain the system pressure at 4.50MPa, and a certain amount of IPP initiator solution was supplemented to maintain a certain po...

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Abstract

The invention relates to a preparation method of a wide-distribution polyvinylidene fluoride. The preparation method comprises the following steps of: adding a vinylidene fluoride monomer into a reaction kettle containing a fluorine-containing surfactant and paraffin, adjusting the pressure of the reaction system to be 0.1MPa, heating to 60-95 DEG C, adding an initiator, adding the vinylidene fluoride monomer continuously, holding the polymerization pressure to be 2.5-6.0MPa, reacting for 30min and then adding a link transferring agent gradually; by the end of the reaction, filtering, rinsing, drying and crushing the prepared polyvinylidene fluoride suspension, so as to obtain a powdered product. The polyvinylidene fluoride resin prepared by the method has wide molecular distribution, high physical and mechanical strength and excellent machinability, and is applicable to the fields of film, electronics and electricity, building and the like.

Description

technical field [0001] The invention relates to the field of preparation of fluorine-containing polymers, in particular to a preparation method of wide-distribution polyvinylidene fluoride. Background technique [0002] 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. It has the characteristics of both fluororesin and general-purpose resin. In addition to properties such as chemical 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 product in the production of fluorine-containing plastics. Generally speaking, the strength and other properties of polyvinylidene fluoride materials depend on the relative molecular mass. The larger the relative molecular mass, the higher the strength, elasticity and environ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F114/22C08F2/38C08F4/34C08F2/00
Inventor 陈琼枫汤诚肖凤祥
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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