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Vacuum drying technique of polytetrafluoroethylene resin with ultra-high molecular weight

A polytetrafluoroethylene, ultra-high molecular weight technology, applied in the direction of drying solid materials, drying solid materials without heating, drying, etc., can solve the problems of adverse effects of resin processing, additive residues, removal, etc., and achieve easy recycling or treatment, resin purity, low total exhaust gas effect

Inactive Publication Date: 2018-03-13
浙江衢州鑫巨氟材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Ultra-high molecular weight polytetrafluoroethylene resin is usually produced by dispersion polymerization process, which usually needs to add surfactants, stabilizers, modifiers, initiators, molecular weight regulators and other additives during the polymerization process. In the process, a certain amount of coagulant is usually added, and it is removed by washing and oven drying, but it is difficult to completely remove it by washing and oven drying, and a small amount of additives remains, which is unfavorable to the subsequent processing of the resin. influences

Method used

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  • Vacuum drying technique of polytetrafluoroethylene resin with ultra-high molecular weight
  • Vacuum drying technique of polytetrafluoroethylene resin with ultra-high molecular weight

Examples

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Embodiment 1

[0037] A vacuum drying process method for ultra-high molecular weight polytetrafluoroethylene resin, comprising the following steps:

[0038] 1) First clean the polymerization kettle, and add paraffin, tetrafluoroethylene and additives into the polymerization kettle according to the designed ratio. It is perfluorooctanoic acid, the stabilizer is paraffin, preferably the paraffin with a melting point of 60°C, and the initiator is ammonium persulfate, then add high-purity water, seal the polymerization kettle, replace it with nitrogen after evacuating, and pass through the mixer when the oxygen content is 20-30ppm Stir and mix evenly, control the polymerization temperature to 70°C, and control the polymerization pressure to 15Kg / cm 2 , the stirring speed is 50r / min, and the continuous stirring time is 80min. After filtration, the monomer is recovered, evacuated and nitrogen is used to restore the internal pressure of the polymerization tank to normal pressure;

[0039] 2) takin...

Embodiment 2

[0044] A vacuum drying process method for ultra-high molecular weight polytetrafluoroethylene resin, comprising the following steps:

[0045]1) First clean the polymerization kettle, and add paraffin, tetrafluoroethylene and additives into the polymerization kettle according to the designed ratio. It is perfluorooctanoic acid, the stabilizer is paraffin, preferably the paraffin with a melting point of 60°C, the initiator is potassium persulfate, then add high-purity water, seal the polymerization kettle, replace it with nitrogen after evacuating, and pass through the mixer when the oxygen content is 20-30ppm Stir and mix evenly, control the polymerization temperature to 75°C, and control the polymerization pressure to 20Kg / cm 2 , the stirring speed is 70r / min, and the continuous stirring time is 90min. After filtering, the monomer is recovered, evacuated and nitrogen is used to restore the internal pressure of the polymerization tank to normal pressure;

[0046] 2) taking out...

Embodiment 3

[0051] A vacuum drying process method for ultra-high molecular weight polytetrafluoroethylene resin, comprising the following steps:

[0052] 1) First clean the polymerization kettle, and add paraffin, tetrafluoroethylene and additives into the polymerization kettle according to the designed ratio. It is perfluorooctanoic acid, the stabilizer is paraffin, preferably the paraffin with a melting point of 60°C, the initiator is sodium persulfate, then add high-purity water, seal the polymerization kettle, replace it with nitrogen after evacuating, and pass through the mixer when the oxygen content is 20-30ppm Stir and mix evenly, control the polymerization temperature to 80°C, and control the polymerization pressure to 25Kg / cm 2 , the stirring speed is 80r / min, and the continuous stirring time is 100min. After filtering, the monomer is recovered, evacuated and nitrogen is used to restore the internal pressure of the polymerization tank to normal pressure;

[0053] 2) taking out ...

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Abstract

The invention discloses a vacuum drying technique of polytetrafluoroethylene resin with ultra-high molecular weight. The vacuum drying technique comprises the following steps: (1) washing, adding paraffin, tetrafluoroethylene and an addition agent into a polymerizing pot in a designed proportion respectively, stirring and mixing the mixture through a stirring machine uniformly, and after filteringthe mixture, recycling monomers; (2) taking out a polymerizing solution obtained in the step (1), and diluting the polymerizing solution with high purity water; (3) adding high purity water into a diluted filter liquor for condensation, and adding a pH conditioning agent into a reaction solution after demulsification in the condensation process; (4) separating the filter liquor after condensation, and treating the separated waste water; (5) drying through a double screw type vacuum pump for 6 to 9 hours, and finally packaging to obtain the product. By adopting the vacuum drying method, the boiling water of water can be reduced, so that the drying temperature is reduced, the energy consumption is reduced, the drying time can be shortened, and the processing of subsequent products is facilitated.

Description

technical field [0001] The invention relates to a vacuum drying process for ultra-high molecular weight polytetrafluoroethylene resin. Background technique [0002] PTFE is a perfluoropolymer with excellent high and low temperature resistance, chemical resistance, flame retardancy, wear resistance, etc. It is widely used in chemical, electronics, petroleum, machinery, environmental protection and other fields, and has become a modern Indispensable material for society. Ultra-high molecular weight polytetrafluoroethylene has a molecular weight of more than 10 million, high molecular weight and high strength. It is usually used in the production of microporous membranes and hollow fiber tubes by biaxial stretching process, and is used in clothing membranes, air filtration membranes, water filtration and other fields. [0003] Ultra-high molecular weight polytetrafluoroethylene resin is usually produced by dispersion polymerization process, which usually needs to add surfactan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F114/26C08F2/38C08F2/44C08F6/12F26B5/04
CPCC08F2/38C08F2/44C08F6/12C08F114/26F26B5/04
Inventor 孟庆文余考明
Owner 浙江衢州鑫巨氟材料有限公司
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