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Preparation method of high-temperature resistant and high-transparent polychlorotrifluoroethylene

The technology of polychlorotrifluoroethylene and chlorotrifluoroethylene is applied in the field of preparation of polychlorotrifluoroethylene, which can solve the problems of yellowing, degradation, and brown color of polychlorotrifluoroethylene, and achieve the effect of excellent mechanical properties.

Inactive Publication Date: 2011-04-20
司林旭 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, since almost all chlorotrifluoroethylene uses non-fluorine initiators at present, the end of chlorotrifluoroethylene is a non-fluorine end group, which will lead to chain degradation during processing and seriously affect the product. color and performance
[0004] U.S. Patents US2751376, US2863916, US2902477, and US3045000 patents use strong oxidants such as chlorine or ozone to treat the end groups of polychlorotrifluoroethylene, which can improve the heat resistance of polychlorotrifluoroethylene, but the intervention of strong oxidants makes polytrifluoroethylene Part of the low-molecular-weight polymers in chlorofluoroethylene has decomposed, which causes the color of the entire polychlorotrifluoroethylene to turn yellow or brown, thereby affecting the film-making of polychlorofluoroethylene

Method used

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  • Preparation method of high-temperature resistant and high-transparent polychlorotrifluoroethylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Put 40 kg of deionized water with a conductivity of 0.02 into a 50L 304SS stainless steel jacketed and stirred autoclave, then add 8 kg of chlorotrifluoroethylene monomer into the polymerization kettle, start the stirring device, and pass people through the jacket. Low-pressure steam, control the temperature in the polymerization tank to 58°C, and the pressure in the polymerization tank to 0.69Mpa. When the temperature of the polymerization system reaches 58°C, pump 4 grams of azobisisooctanonitrile with a metering pump, then keep the system temperature at 58°C, and the system pressure at 0.69Mpa for 12 hours, drain the system pressure, and the polychlorotrifluoroethylene powder and water are emitted from the bottom of the polymerization kettle, and the polychlorotrifluoroethylene powder and water are separated by a plate filter, and the polytrifluorochloroethylene powder is dried in an oven to obtain 6 kg of dry polytrifluorochloroethylene powder.

[0020] Add 6 kg of ...

Embodiment 2

[0023] Put 35 kg of deionized water with a conductivity of 0.06μ into a 50L 304SS stainless steel jacketed and stirred autoclave, then add 5 kg of chlorotrifluoroethylene monomer into the polymerization kettle, start the stirring device, and pass Use low-pressure steam to control the temperature in the polymerization kettle to 70°C and the pressure in the polymerization kettle to 0.9Mpa. When the temperature of the polymerization system reaches 70°C, pump 5 grams of azobisisononononitrile with a metering pump, then keep the system temperature at 70°C and the system pressure at 0.9Mpa for 13 hours, drain the system pressure, and the polychlorotrifluoroethylene powder and water are discharged from the bottom of the polymerization kettle, and the polychlorotrifluoroethylene powder and water are separated by a plate filter, and the polytrifluorochloroethylene powder is dried in an oven to obtain 4 kg of polytrifluorochloroethylene dry powder.

[0024] Add 4 kg of polychlorotrifluo...

Embodiment 3

[0027] Put 40 kg of deionized water with a conductivity of 0.08μ into a 50L 304SS stainless steel jacketed and stirred autoclave, then add 5 kg of chlorotrifluoroethylene monomer into the polymerization kettle, start the stirring device, and pass Use low-pressure steam to control the temperature in the polymerization kettle to 58°C and the pressure in the polymerization kettle to 0.69Mpa. When the temperature of the polymerization system reaches 58°C, pump 4 grams of azobisisodecylnitrile with a metering pump, then keep the system temperature at 58°C, and the system pressure at 0.69Mpa for 15 hours, drain the system pressure, and the polychlorotrifluoroethylene powder and water are released from the bottom of the polymerization kettle, and the polychlorotrifluoroethylene powder is separated from water by a plate filter, and the polychlorotrifluoroethylene powder is dried in an oven to obtain 3.5 kg of dry polytrifluorochloroethylene powder.

[0028] Add 3.5 kg of polychlorotri...

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PUM

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Abstract

The invention relates to a preparation method of high-temperature resistant and high-transparent polychlorotrifluoroethylene, which comprises the steps of firstly preparing polychlorotrifluoroethylene resin in deionized water from chlorotrifluoroethylene under the action of an azo type initiator, and then using cobalt fluoride to terminate the polychlorotrifluoroethylene. The polychlorotrifluoroethylene prepared by the method has excellent mechanical properties and can be resistant to the temperature of 400 DEG C, and the color can not be changed within 10 hours at the temperature of 300 DEG C.

Description

technical field [0001] The invention relates to a preparation method of polychlorotrifluoroethylene, in particular to a preparation method of high temperature resistant and highly transparent polychlorotrifluoroethylene (PCTFE). Background technique [0002] Polytrifluorochloroethylene has good chemical inertness, chemical corrosion resistance and heat resistance, high mechanical strength and toughness, excellent dielectric properties and optical properties. Polychlorotrifluoroethylene does not crack or creep in liquid oxygen, liquid nitrogen and liquefied natural gas, and has a wide effective use temperature (-240°C-205°C). [0003] However, since almost all chlorotrifluoroethylene uses non-fluorine initiators at present, the end of chlorotrifluoroethylene is a non-fluorine end group, which will lead to chain degradation during processing and seriously affect the product. color and performance. [0004] U.S. Patents US2751376, US2863916, US2902477, and US3045000 patents u...

Claims

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Application Information

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IPC IPC(8): C08F114/24C08F4/04C08F8/20
Inventor 司林旭张峰牛琦
Owner 司林旭
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