Solution polymerization method of polyvinylidene fluoride copolymer

A polyvinylidene fluoride and polymerization method technology, applied in the polymer field, can solve the problems of affecting the thermal stability of the polymer, increasing the complexity of the process, and being expensive, and achieving low production cost, good processing performance, and less environmental pollution. Effect

Active Publication Date: 2014-04-30
SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although most of the emulsifier can be removed by washing and other processes, it is difficult to completely remove it
The emulsifier contained will affect the thermal stability of the polymer. At the same time, the addition of emulsifier will also increase its cost and increase the complexity of the process. Patents US2007290407\US704558

Method used

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  • Solution polymerization method of polyvinylidene fluoride copolymer

Examples

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Embodiment 1

[0024] Taking a 5L polymerization kettle as an example, after evacuating and removing oxygen, after the oxygen content is qualified, the reactor is cooled to 0°C, and 15kg of initial monomer mixture is added. The initial monomer mixture is hexafluoropropylene and vinylidene fluoride with a molar ratio of 1:5 mixing, heat the reactor to 50°C, at this time the pressure is 0.9±0.1MPa, add 300g of 1.0wt% peroxydicarbonate bis(3-methoxybutyl) initiator and 5g of acetone. Reaction starts, add to reactor and add monomer mixture, keep pressure constant, when adding 250g to add monomer mixture, add 5g molecular weight regulator acetone again, stop the heating of reactor when adding 500g to add monomer mixture, Stop adding the monomer mixture, stop stirring, cool the reaction material to 10°C, collect the unreacted monomer into the recovery tank for subsequent copolymerization, and add the monomer mixture of hexafluoropropylene and vinylidene fluoride to massage The mixing ratio is 1:6....

Embodiment 2

[0026] Taking a 5L polymerization kettle as an example, after evacuating and removing oxygen, after the oxygen content is qualified, the reactor is cooled to 10°C, and 15kg of initial monomer mixture is added. The initial monomer mixture is hexafluoropropylene and vinylidene fluoride with a molar ratio of 1:3 mixing, heat the reactor to 55°C, at this time the pressure is 1.0±0.1Mpa, add 300g of 1.0wt% bis(3-methoxybutyl) peroxydicarbonate initiator and 5g of ethyl propionate ester. Reaction starts, add additional monomer mixture to the reactor, keep the pressure constant, when adding 250g additional monomer mixture, add 5g molecular weight modifier ethyl propionate again, after adding 500g additional monomer mixture, stop the reaction Heating of the reactor, stop adding the monomer mixture, stop stirring, cool the reaction material to 30°C, collect the unreacted monomer into the recovery tank for subsequent copolymerization, and add the monomer mixture as hexafluoropropylene a...

Embodiment 3

[0028] Take a 5L polymerization kettle as an example. After evacuating and removing oxygen, after the oxygen content is qualified, the reactor is cooled to 5°C, and 15kg of initial monomer mixture is added. The initial monomer mixture is hexafluoropropylene and vinylidene fluoride. The molar ratio is 1:1.5 mixing, heat the reactor to 60°C, at this time the pressure is 1.1±0.1Mpa, add 300g of 1.0wt% azobisisobutyronitrile initiator and 5g of acetone. Reaction starts, add to reactor and add monomer mixture, keep pressure constant, when adding 250g to add monomer mixture, add 5g molecular weight regulator acetone again, stop the heating of reactor when adding 500g to add monomer mixture, Stop adding the monomer mixture, stop stirring, cool the reaction material to 20°C, collect the unreacted monomer into the recovery tank for subsequent copolymerization, and add the monomer mixture of hexafluoropropylene and vinylidene fluoride to massage The mixing ratio is 1:15. Vent, unload t...

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Abstract

The invention relates to a preparation method of a polyvinylidene fluoride copolymer. A polymerization method for polymerization is a novel solution polymerization method. The solution polymerization method is characterized in that an initial monomer is used as a dispersion medium, organic peroxides are used as initiating agents, and ketone and esters are used as molecular weight modifiers; technological polymerization conditions are mild, the process is simple and easy to operate, and the cost is low; the polyvinylidene fluoride copolymer is low in impurity content, good in thermochemistry stability, low in melting point, high in thermal decomposition temperature, wide in processing temperature and easy to operate, has good flexibility and is unlikely to crack.

Description

technical field [0001] The invention belongs to the technical field of macromolecules, and in particular relates to a solution polymerization method of a polyvinylidene fluoride copolymer. Background technique [0002] Polyvinylidene fluoride (PVDF) has good heat resistance, corrosion resistance, good chemical stability, excellent UV resistance and aging resistance, and can be used to produce PVDF pumps, valves, pipe fittings and other processing methods such as molding and injection molding. Filling, etc., PVDF rods, plates, pipes, hoses, monofilaments and wire insulation layers can be produced by extrusion processing methods, which are very versatile. Compared with homopolymer, PVDF copolymer has the advantages of low melting point, good flexibility, and easy processing. Therefore, polyvinylidene fluoride copolymer is more and more popular. [0003] In terms of polymerization process, most of the traditional PVDF polymerization processes use emulsion polymerization and su...

Claims

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Application Information

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IPC IPC(8): C08F214/22C08F214/28C08F2/06
Inventor 王汉利李秀芬唐妮王军
Owner SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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