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Production method of polychlorotrifluoroethylene for electrostatic spraying

A technology of polychlorotrifluoroethylene and chlorotrifluoroethylene, which is applied in the direction of devices and coatings for coating liquids on the surface, can solve the requirements of polychlorotrifluoroethylene with wide molecular weight distribution, difficult electrostatic powder coating materials, and reaction equipment It can achieve the effect of easy continuous production, simple design of reaction equipment, and short polymerization reaction time.

Inactive Publication Date: 2008-01-30
青岛宏丰氟硅科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

GB578168 discloses the preparation of polychlorotrifluoroethylene by bulk polymerization, although the polymerization temperature is not too high, but the polymerization pressure is relatively high
In addition, ultraviolet light irradiation is required during polymerization, which requires high requirements for reaction equipment.
[0007] Other patents for synthesizing polychlorotrifluoroethylene also include US26563322, US2689242, US3671510, US4155953, etc., but the molecular weight distribution of polychlorotrifluoroethylene prepared by the above-mentioned patents is relatively wide and the particle size is relatively large, so it is difficult to be used as an electrostatic powder spraying material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In a 2-liter stainless steel reaction kettle, add 1600 milliliters of water, 4 grams of ammonium persulfate, 2 grams of Na 2 S 2 o 4 (initiator), 4 gram of ammonium bicarbonate (pH buffering agent), stir at 0~20 ℃, make pH value be 5~8, concentration is the initiator aqueous solution of 0.1~1%; Then, to reaction kettle 400 g of chlorotrifluoroethylene monomer was charged, the polymerization temperature was controlled at 60° C., and the rotation speed was 150 rpm.

[0020] After 7 hours, the polymerization was terminated with 75% of the chlorotrifluoroethylene monomer converted to polymer. Use hydrochloric acid to adjust the pH of the solution to 6, and heat to 40°C to 60°C, and add sufficient calcium chloride under vigorous stirring to flocculate the polymer. The product was washed with water and air-dried at 150°C.

Embodiment 2

[0022] In 5 liters of stainless steel reactors, add 3750 milliliters of waters, 12.5 grams of tert-butyl peroxybenzoates make initiator, 7.5 grams of sodium thiosulfate (Na 2 S 2 o 3 ), 0.075 g of sodium hydrogen phosphite (Na 2 HPO 3 ). Thereafter, 1250 g of chlorotrifluoroethylene monomer was charged into the reactor, the polymerization temperature was controlled at 25° C., the rotation speed was 200 rpm, and the reaction was carried out for 24 hours.

[0023] The polymerization was terminated, and 90% of the chlorotrifluoroethylene monomers were converted into polymers. The reactor was opened, the polymer was taken out, washed with water, and air-dried at 150°C.

Embodiment 3

[0025] In the thick-walled pressure-resistant glass tube reactor with a volume of 300 milliliters, add 200 milliliters of water, 5 grams of triethylolamine and 5 grams of borax (Na 2 B 4 o 7 ) (pH buffer), 2 gram dibenzoyl peroxide initiators, afterward, in reactor, pass into 30 gram chlorotrifluoroethylene monomers, pressure is controlled at 0.2MPa, and polymerization temperature is 75 ℃, polymerization time 50 Hour.

[0026] Upon cooling, a white flocculent polymer formed. 50% of the chlorotrifluoroethylene monomer was converted to polymer. The polymer was taken out, washed with water, and air-dried at 150°C.

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Abstract

A production method of fluorothene for electrostatic spray relates to a synthetic method of fluorothene for electrostatic spray. The fluorothene for electrostatic spray is obtained by aqueous solution suspension radical polymerization: first pH buffer: initiator equaling to 1:0.01-100 molar ratio is weighted; then water is added in the pH buffer and initiator, 0.1-1 percent of aqueous solution is produced and the aqueous solution is evenly stirred at 0-20 DEG C to produce initiator aqueous solution, pH value of which is 5-8; chlorotrifluoroethylene is added in the initiator aqueous solution to practice polymerization, the ratio of the chlorotrifluoroethylene and initiator aqueous solution is 1:0.01-1 molar, the temperature is raised to 20-80 DEG C, the stirring rate is 100-300rpm, the reaction pressure is 0.5-1.5MPa, the reaction time is 4-15 hours, and powder fluorothene for electrostatic spray is obtained after filtering, washing and drying. The invention has high raw material conversion rate, small polymer particle size, good physical and mechanical properties and simple process and is suitable for industrial production.

Description

technical field [0001] The invention discloses a production method of polychlorotrifluoroethylene for electrostatic spraying, which relates to a synthesis process of polychlorotrifluoroethylene for electrostatic spraying, and is specifically prepared by adopting an aqueous solution suspension free radical initiation polymerization method. Background technique [0002] Among many fluoroplastics, polychlorotrifluoroethylene (PCTFE) has excellent light transmission, mechanical strength and the lowest water-vapor permeability, so it can be made into moisture-proof packaging films and sealed devices. In addition, due to the polarity of chlorotrifluoroethylene molecules, polychlorotrifluoroethylene has good electrical properties, and is the best raw material for manufacturing molding materials, packaging film materials and anti-corrosion and weather-resistant coatings. [0003] There are many ways to synthesize homopolymers and copolymers of chlorotrifluoroethylene. In the presen...

Claims

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Application Information

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IPC IPC(8): C08F114/24C09D127/12B05D1/04
Inventor 杨勇徐平先杨涛陈秉堄朱章龙
Owner 青岛宏丰氟硅科技有限公司
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