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Novel hydrophilic modified vinylidene fluoride copolymer

A technology of vinylidene fluoride and hydrophilic modification, applied in the direction of coating, etc., can solve the problems of membrane pore blockage, membrane fouling, large driving force, etc.

Inactive Publication Date: 2015-07-29
浙江化工院科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low surface energy and strong hydrophobicity of PVDF resin, the separation membrane prepared by using it has low water flux, and the separation process requires a large driving force, and it is easy to absorb grease during the treatment of the aqueous phase system, resulting in Membrane pores are clogged, causing membrane fouling and difficult to clean

Method used

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  • Novel hydrophilic modified vinylidene fluoride copolymer
  • Novel hydrophilic modified vinylidene fluoride copolymer
  • Novel hydrophilic modified vinylidene fluoride copolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Add 2,500 grams of deionized water, 5 grams of ammonium perfluorooctanoate and its homologous mixtures, and 1 gram of paraffin wax with a melting point of about 60° C. in a 5-liter vertical polymerization reactor. The reactors were combined, vacuumed and replaced with nitrogen until the oxygen content in the reactor was less than 10ppm, and then a certain amount of vinylidene fluoride monomer was added to bring the pressure inside the reactor to 3.0MPa. Then start stirring at a rate of 500 rpm, raise the temperature in the reactor to 68° C., and continue to supply vinylidene fluoride monomer until the pressure in the reactor reaches 6.0 MPa. Add 0.5 g of dibenzoyl peroxide (BPO) to start the polymerization. The pressure in the reactor is maintained at 4.5 MPa by adding vinylidene fluoride monomer, and BPO is added at a rate of 0.1 g / 60 minutes. When the specified weight of vinylidene fluoride monomer is added and the reaction pressure in the reactor drops to 2.0 Stop a...

Embodiment 2

[0048] Add 2500 grams of deionized water and 5 grams of methylcellulose in a 5-liter vertical polymerization reactor. Combine the reactors, vacuumize and replace with nitrogen until the oxygen content in the reactor is less than 5ppm, add the specified amount of vinylidene fluoride monomer, and then add the specified amount of copolymerization monomer in stages according to the proportion of 1% of the weight of vinylidene fluoride Dimethyl Vinyl Phosphonate. Then start stirring at a rate of 700 rpm, raise the temperature in the reactor to 28° C., add 2.5 g of dibenzoyl peroxide (BPO) to start the polymerization reaction. Stop the polymerization reaction when the reaction reaches the specified time, and obtain a vinylidene fluoride copolymer.

[0049] A flat film was prepared using 5 grams of the copolymer, and the test data are shown in Table 1.

Embodiment 3

[0051] Change the feeding amount of comonomer into 3% of vinylidene fluoride monomer weight, all the other are the same test of embodiment 1. Stop the polymerization reaction when the reaction reaches the specified time, and obtain a vinylidene fluoride copolymer.

[0052] A flat film was prepared using 5 grams of the copolymer, and the test data are shown in Table 1.

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Abstract

The present invention discloses a hydrophilic modified vinylidene fluoride copolymer, which is copolymerized by vinylidene fluoride and at least one modified vinyl phosphonic ester comonomer shown as the following structural formula (I), wherein each substituent is defined as in the specification. The vinylidene fluoride copolymer can be used for water treatment membrane or paint.

Description

technical field [0001] The invention relates to a novel hydrophilic modified vinylidene fluoride copolymer. Background technique [0002] Polyvinylidene fluoride (PVDF) is a homopolymer of vinylidene fluoride (VDF). It is a kind of tough thermoplastic engineering plastics. It is mainly used in four major fields: petrochemical industry, electronics and electrical appliances, fluorocarbon coatings and membrane materials. However, due to the low surface energy and strong hydrophobicity of PVDF resin, the water flux of the separation membrane prepared by it is low, the separation process requires a large driving force, and it is easy to absorb oil during the treatment of the aqueous phase system, which leads to Membrane pores are clogged, causing membrane fouling and difficult cleaning. Therefore, there is a need to improve the hydrophilic properties of PVDF. Copolymerization modification is a kind of preferred method, and prior art has following report: [0003] US Patent No...

Claims

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Application Information

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IPC IPC(8): C08F214/22C08F230/02C08F214/28C09D127/16
Inventor 朱伟伟方敏徐宇威刘光烜
Owner 浙江化工院科技有限公司