Fluorine-containing polymer powder and preparation method thereof

A polymer and powder technology, applied in the field of fluorine-containing polymer powder and its preparation, can solve the problems of unfavorable follow-up washing and easy caking, and achieve the effects of shortening drying time, not easy to agglomerate, and simple method

Active Publication Date: 2015-04-22
ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the disadvantages of the prior art that the direct salting-out polymerization method of fluorine-containing polymers is easy to agglomerate and unfavorable for subsequent washing, the present invention provides a method for preparing fluorine-containing polymer powders. The fluorine-containing polymers processed by this method The material is in powder form, which is conducive to washing and drying in the post-processing process

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  • Fluorine-containing polymer powder and preparation method thereof

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Embodiment 1

[0028] The preparation method of embodiment 1 fluoropolymer powder

[0029] 1. Add 10°C deionized water to the fluorine-containing emulsion to adjust the specific gravity of the emulsion to 1.1. The fluorine-containing emulsion is obtained by emulsion polymerization of vinylidene fluoride and chlorotrifluoroethylene at a molar ratio of 1:1, and the solid content is 30%;

[0030] 2. Stir the fluorine-containing emulsion after adjusting the specific gravity under the condition of 2000 rpm, add 200g of magnesium chloride during the stirring process, stir for 20min, and obtain the fluorine-containing polymer precipitated by demulsification after the stirring is stopped;

[0031] 3. Wash the fluorine-containing polymer separated out by demulsification with 10°C deionized water (the average particle diameter of the fluorine-containing coating separated out by demulsification is 350 μm), wash repeatedly 4 times, and the amount of deionized water used for each wash It is twice the vo...

Embodiment 2

[0032] The preparation method of embodiment 2 fluoropolymer powders

[0033] 1. Add 1°C deionized water to the fluorine-containing emulsion to adjust the specific gravity of the emulsion to 1.05. The fluorine-containing emulsion is obtained by emulsion polymerization of vinylidene fluoride and hexafluoropropylene at a ratio of 1:4 (molar ratio), and the solid content is 27%;

[0034] 2. Stir the fluorine-containing emulsion after adjusting the specific gravity under the condition of 1000 rpm, add 300g of magnesium chloride during the stirring process, stir for 5 minutes, stop stirring to obtain the fluorine-containing polymer precipitated by demulsification;

[0035] 3. Wash the fluorine-containing polymer separated out by demulsification with 1° C. of deionized water (the average particle diameter of the fluorine-containing polymer separated out by demulsification is 700 μm), and wash repeatedly 8 times, and the amount of deionized water used for each washing is The amount i...

Embodiment 3

[0036] The preparation method of embodiment 3 fluoropolymer powders

[0037] 1. Add 15°C deionized water to the fluorine-containing emulsion to adjust the specific gravity of the emulsion to 1.15. The fluorine-containing emulsion is obtained by emulsion polymerization of vinylidene fluoride and tetrafluoroethylene at a ratio of 3:1 (molar ratio), and the solid content is 30%,;

[0038] 2. Stir the fluorine-containing emulsion after adjusting the specific gravity under the condition of 3000 rpm, add 900g coagulant magnesium chloride during the stirring process, stir for 30min, stop stirring to obtain the fluorine-containing polymer precipitated by demulsification;

[0039] 3. Wash the fluorine-containing polymer separated out by demulsification with 30° C. deionized water (the average particle diameter of the fluorine-containing polymer separated out by demulsification is 600 μm), and wash repeatedly 6 times. The amount of deionized water used for each wash is 1.5 times the vo...

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Abstract

The invention discloses fluorine-containing polymer powder and a preparation method thereof. The method comprises the following steps: 1) adding deionized water at 1-15 DEG C into fluorine-containing emulsion, and adjusting the specific gravity of the emulsion to 1.05-1.15; 2) stirring the fluorine-containing emulsion at a speed of 1,000-3,000rpm while adding a flocculant, stirring for 5-30min to obtain a demulsified fluorine-containing polymer; and 3) washing the demulsified fluorine-containing polymer with deionized water at 1-30 DEG C until the electrical conductivity of the washing water is lower than or equal to 10us / cm, and drying to obtain the fluorine-containing polymer powder. By adopting the technical scheme provided by the invention, the average particle size of the demulsified fluorine-containing polymer is 350-700mu m, the moisture content after washing and drying is low, and the fluorine-containing polymer is in a powder form which facilitates the washing and drying in the after-treatment process; and moreover, the use of washing water can be reduced, the drying time is shortened, the productivity of the equipment is improved, and industrial production is facilitated.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to fluorine-containing polymer powder and a preparation method thereof. Background technique [0002] Fluoropolymers have excellent mechanical strength, impact resistance, radiation resistance, water and chemical resistance, weather resistance, etc., and have the characteristics of large piezoelectric coefficient, low refractive index, and wide frequency response. Its outstanding feature is its good chemical stability. [0003] The preparation methods of fluoropolymers mainly include emulsion polymerization, suspension polymerization and the like. The emulsion formed by emulsion polymerization must be coagulated, washed and dried before further processing. There are mainly two methods of coagulation, physical and chemical, physical coagulation such as freezing, stirring, etc., and chemical coagulation such as salting out. [0004] At present, the coagulation method us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F6/22C08J3/16C08F214/22C08F214/24C08F214/28C08F214/26
Inventor 余金龙兰军张廷健王先荣
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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