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Emulsion polymerization method for VDF homopolymer or copolymer

An emulsion polymerization and copolymer technology, which is applied in the field of emulsion polymerization of VDF homopolymer or copolymer, can solve the problems of no other advantages, complicated operation process, and difficulty in obtaining emulsifier raw materials.

Active Publication Date: 2012-07-18
SINOCHEM LANTIAN +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Through the above analysis, it can be seen that when replacing PFOA in the prior art, the emulsion must be configured into a microemulsion to react, and there are disadvantages such as complex operation process, difficult polymerization process control, and difficult availability of emulsifier raw materials; or use other types of emulsifiers, Although the replacement of PFOA has been realized, compared with the preparation process using perfluorooctanoic acid amine, it can only slightly increase the solid content of the resin, and has no other advantages

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 1.0 g of hexafluoropropylene oxide tetramer ammonium carboxylate and pure water were pre-configured into 180 g of emulsifier aqueous solution. In a 5-liter vertical polymerization kettle, add 2580 grams of pure water and 170 grams of the above-mentioned emulsifier aqueous solution, close the polymerization kettle, start stirring, vacuumize and replace with nitrogen three times, and fill 100 grams of VDF monomer into the reaction kettle , start heating the reactor, raise the temperature of the reactor to 55°C, and continue to add VDF monomer to the reactor until the pressure of the reactor reaches 3.5MPa. Use a metering pump to inject about 1 / 3 of the pre-configured emulsion of IPP and ethyl acetate to start the polymerization. The configuration method of the emulsion is that 2.5 grams of IPP, 3.5 grams of ethyl acetate, 250 grams of pure water and 10 grams of emulsifier aqueous solution are stirred at high speed with a high-speed mixer. As the polymerization reaction p...

Embodiment 2

[0044] Hexafluoropropylene oxide tetramer ammonium carboxylate was changed to hexafluoropropylene oxide tetramer sodium carboxylate, and the dosage was increased to 2.0 g, and the rest of the operating conditions were the same as in Example 1.

[0045] After 1.58 hours of polymerization, a homogeneous emulsion was obtained with a solid content of 23.08%. After the emulsion was left for a week, the appearance was still a uniform emulsion with no sediment at the bottom of the cup.

Embodiment 3

[0047] The consumption of hexafluoropropylene oxide tetramer ammonium carboxylate is raised to 6.0 grams, the consumption of initiator IPP is raised to 4.2 grams, the addition of VDF monomer is raised to 1900 grams, all the other operating conditions are the same as in Example 1 same.

[0048] After 3.80 hours of polymerization, a transparent emulsion was obtained with a solid content of 39.58%. The emulsion remained stable for 2 months, and the appearance was still a transparent emulsion without sedimentation.

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Abstract

The invention relates to an emulsion polymerization method for VDF homopolymer or copolymer, which adopts perfluoroalkyl polyethers carboxylate having a constitutional formula of CF3CF2CF2O (CF (CF3) CF2O)-2CF (CF3) COOM (n is the integer from 2 to 6) as emulsifier. The prepared VDF emulsion or the copolymerized emulsion of VDF and other monomers has good stability, can be stood for one week or more than two mouths and keep even lactescence without subsiding, has high emulsion solid content, short reaction time and less emulsifier usage.

Description

technical field [0001] The invention relates to an emulsion polymerization method of vinylidene fluoride (VDF) homopolymer or copolymer, especially an emulsion polymerization method using perfluoropolyether carboxylate as emulsifier. Background technique [0002] Among fluorine-containing resins, polyvinylidene fluoride (PVDF) has the best rigidity, hardness and wear resistance, the highest heat distortion temperature, the lowest melting point, the difference between melting point and decomposition temperature is far, and it has high tensile and compressive strength. , so it has excellent melt processing performance, and is easy to process into diaphragm materials. Its application fields are all over the parts in the chemical industry such as pipes, valves, storage tanks, heat exchangers, membranes, flanges, etc., ultra-pure materials in the semiconductor industry Coatings and films resistant to ultraviolet rays and gamma rays in water pipes and buildings, aerospace fields, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F14/22C08F2/26
Inventor 方敏徐宇威傅公维王佩刚吴旭晴杨箭
Owner SINOCHEM LANTIAN