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Preparation method of hydrophilic polyvinylidene fluoride resin

A technology of polyvinylidene fluoride resin and hydrophilicity, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve problems such as shedding of nanoparticles and failure to remove heavy metal ions, and achieve low intrinsic viscosity, High rejection rate, mild polymerization reaction process and excellent effect

Active Publication Date: 2018-08-31
ZHEJIANG QUZHOU JUSU CHEM IND CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the nanoparticles on the surface are easy to fall off, and have almost no removal effect on heavy metal ions.

Method used

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  • Preparation method of hydrophilic polyvinylidene fluoride resin
  • Preparation method of hydrophilic polyvinylidene fluoride resin
  • Preparation method of hydrophilic polyvinylidene fluoride resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A kind of hydrophilic polyvinylidene fluoride resin, its raw material formula is as follows:

[0030]

[0031] The preparation method is as follows:

[0032] (1) Suspension polymerization

[0033] After adding 240kg of deionized water to the polymerization kettle, replace it with high-purity nitrogen gas. After the replacement is qualified, add 70kg of VDF monomer, 30kg of acrylic acid, 0.09kg of hydroxymethyl cellulose, 0.3kg of mercaptan, 0.4kg of diisopropyl peroxycarbonate and 10kg of deionized water was reacted at a stirring speed of 55rpm, the reaction temperature was 35°C, the reaction time was 12h, and the reaction pressure was 2.7Mpa to obtain a suspension polymerization product;

[0034] (2) Post-processing of suspension polymerization products

[0035] The suspension polymerization product obtained in step (1) was first washed 3 times with 20°C deionized water (washing speed 30rpm), then washed 3 times with 60°C deionized water, and then centrifuged for ...

Embodiment 2

[0037] A kind of hydrophilic polyvinylidene fluoride resin, its raw material formula is as follows:

[0038]

[0039]

[0040] A kind of preparation method of hydrophilic polyvinylidene fluoride resin, concrete steps are as follows:

[0041] (1) Suspension polymerization

[0042] Add 270kg of deionized water to the polymerization kettle and replace it with high-purity nitrogen gas. After the replacement is qualified, add 73kg of VDF monomer, 27kg of conynic acid, 0.11kg of hydroxypropyl cellulose, 0.2kg of ethyl acetate, and 0.6kg of dimethyl peroxycarbonate. Ester and 10kg of deionized water were reacted at a stirring speed of 60rpm, the reaction temperature was 28°C, the reaction time was 15h, and the reaction pressure was 3.0Mpa to obtain a suspension polymerization product;

[0043] (2) Post-processing of suspension polymerization products

[0044] Wash the suspension polymerization product obtained in step (1) with 25°C deionized water for 3 times (washing speed 3...

Embodiment 3

[0046]A kind of hydrophilic polyvinylidene fluoride resin, its raw material formula is as follows:

[0047]

[0048] A kind of preparation method of hydrophilic polyvinylidene fluoride resin, concrete steps are as follows:

[0049] (1) Suspension polymerization

[0050] Add 290kg deionized water to the polymerization kettle and replace it with high-purity nitrogen gas. After the replacement is qualified, add 77kg VDF monomer, 13kg conynic acid, 10kg acrylic acid, 0.4kg hydroxypropyl cellulose, 0.4kg hydroxymethyl cellulose, 0.2kg ethyl acetate, 0.44kg dipropyl peroxycarbonate and 10kg deionized water were reacted at a stirring speed of 65rpm, the reaction temperature was 26°C, the reaction time was 18h and the reaction pressure was 3.5Mpa to obtain a suspension polymerization product;

[0051] (2) Post-processing of suspension polymerization products

[0052] The suspension polymerization product obtained in step (1) was first washed 3 times with 30°C deionized water (was...

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Abstract

The invention discloses a preparation method of hydrophilic polyvinylidene fluoride resin. The preparation method comprises the steps that 1, 200-400 parts of deionized water, 60-90 parts of VDF monomers, 10-50 parts of comonomers, 0.05-1.5 parts of dispersing agents, 0.1-0.5 part of chain transfer agents and 0.1-1.0 part of initiator react with one another at the stirring rotating speed of 50-80rpm, and a suspension polymerization product is obtained, wherein the reaction temperature ranges from 20 DEG C to 40 DEG C, the reaction time is 12-24 hours, and the reaction pressure is 2.0-4.5 Mpa;2, the suspension polymerization product obtained in the first step is washed, centrifugally dehydrated and dried to obtain the hydrophilic polyvinylidene fluoride resin product. The method is simplein process and suitable for industrialization. An ultra-filtration membrane prepared from the obtained product has relatively good hydrophilicity, relatively high membrane flux, long service life andgood metal ion removal effects.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a preparation method of hydrophilic polyvinylidene fluoride resin. Background technique [0002] Polyvinylidene fluoride (PVDF) has been widely used in the preparation of microstructures due to its good mechanical properties, heat resistance, chemical corrosion resistance and easy film formation, so that the corresponding film has excellent chemical oxidation resistance and corrosion resistance. Water treatment membrane fields such as filtration, ultrafiltration and reverse osmosis membranes. However, due to the strong hydrophobicity of PVDF, PVDF membranes have defects such as low water flux, easy to be polluted by organic matter, and short service life, and conventional PVDF water treatment membranes have almost no removal effect on heavy metal ions, which severely limit PVDF membranes. The scope of application of water treatment membranes. [0003] Conv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F214/22C08F220/06C08F222/02C08F2/38C08F2/20C02F1/44C02F101/20
CPCC02F1/444C02F2101/20C08F2/20C08F2/38C08F214/225C08F220/06C08F222/02
Inventor 韩金铭吴志刚尹作柱苏兰辉王正良吴宇鹏祝龙信赵鑫犇马从礼吕颖琦
Owner ZHEJIANG QUZHOU JUSU CHEM IND CO LTD
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