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Method for preparing PTFE (Polytetrafluoroethylene) through suspension polymerization

A PTFE, suspension polymerization technology, applied in the field of chemical production, can solve the problems of small resin molecular weight, uneven particle size, high residual amount of fluorine-containing emulsifier, etc., and achieve the effect of appropriate particle size

Pending Publication Date: 2022-03-01
ZHEJIANG JUSHENG FLUOROCHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The molecular weight of the resin is small and the particle size is uneven, and the residual amount of fluorine-containing emulsifier in the obtained resin is relatively high, which is harmful to the environment and human body

Method used

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  • Method for preparing PTFE (Polytetrafluoroethylene) through suspension polymerization
  • Method for preparing PTFE (Polytetrafluoroethylene) through suspension polymerization
  • Method for preparing PTFE (Polytetrafluoroethylene) through suspension polymerization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A method for preparing PTFE by suspension polymerization, the operation steps are:

[0039] (1) Add 1500kg deionized water to the polymerization kettle after the polymerization kettle is evacuated;

[0040] (2) Add synergist 1*10 to the auxiliary tank -6 kg; emulsifier 2*10 -7 kg, after being purged and replaced by nitrogen gas, put it into the polymerization kettle, and after adding it into the polymerization kettle, take the initiator 3*10 -6 kg, was added to the polymerization kettle; through the jacket water inlet valve of the polymerization kettle, hot water was passed into the jacket of the polymerization kettle, so that the temperature of the polymerization kettle was raised to 65°C; the polymerization kettle was vacuumed and replaced with nitrogen, and repeated three times, Then the polymerization kettle is pressurized to 280kPa, and the oxygen content in the polymerization kettle is sampled and analyzed; after the oxygen content in the polymerization kettle i...

Embodiment 2

[0050] A method for preparing PTFE by suspension polymerization, the operation steps are:

[0051] (1) Add 1600kg deionized water to the polymerization kettle after the polymerization kettle is evacuated;

[0052] (2) Add synergist 1*10 to the auxiliary tank -5 kg; emulsifier 1.5*10 -6 kg, after being purged and replaced by nitrogen gas, put it into the polymerization kettle, and after adding it into the polymerization kettle, take the initiator 2*10 -6 kg, was added to the polymerization kettle; through the jacket water inlet valve of the polymerization kettle, hot water was passed into the jacket of the polymerization kettle, so that the temperature of the polymerization kettle was raised to 67°C; the polymerization kettle was vacuumed and replaced with nitrogen, and repeated three times, Then the polymerization kettle is pressurized to 290kPa, and the oxygen content in the polymerization kettle is sampled and analyzed; after the oxygen content in the polymerization kettle...

Embodiment 3

[0062] A method for preparing PTFE by suspension polymerization, the operation steps are:

[0063] (1) Add 2000kg deionized water to the polymerization kettle after vacuumizing the polymerization kettle;

[0064] (2) Add synergist 3*10 to the auxiliary tank -5 kg, emulsifier 2.5*10 -6 kg, after being purged and replaced by nitrogen gas, put it into the polymerization kettle, and after adding it into the polymerization kettle, take the initiator 6*10 -6 kg, was added to the polymerization kettle; through the jacket water inlet valve of the polymerization kettle, hot water was introduced into the jacket of the polymerization kettle, so that the temperature of the polymerization kettle was raised to 68°C; the polymerization kettle was vacuumed and nitrogen replacement, repeated three times, Then the polymerization kettle is pressurized to 300kPa, and the oxygen content in the polymerization kettle is sampled and analyzed; after the oxygen content in the polymerization kettle is...

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Abstract

The invention relates to the technical field of chemical production, in particular to a method for preparing PTFE through suspension polymerization. According to the method for preparing PTFE through suspension polymerization, high-purity water is used as a medium, primary polytetrafluoroethylene particles with the small particle size are firstly prepared through a suspension method, a small amount of emulsifier perfluorohexanoic acid and a synergist are added into the primary particles, the solution is further made to be in a micro-emulsification phenomenon, and the obtained resin is small in molecular weight and proper in particle size; and airflow drying equipment can be used for drying. In addition, the residual quantity of the fluorine-containing emulsifier in the PTFE resin prepared by the method is lower than 25ppb, and the residual quantity does not cause harm to the environment and human bodies.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a method for preparing PTFE by suspension polymerization. Background technique [0002] Suspension method polytetrafluoroethylene resin is a white powdery resin made of tetrafluoroethylene in water medium, using persulfate as an initiator, suspension polymerization, crushing, grinding, washing and drying. Various excellent properties of ethylene. Suspended resins are divided into various grades with different particle sizes and different apparent densities, which are respectively suitable for different processing methods such as molding, hydraulic pressure, and plunger extrusion, and can be processed into various profiles such as plates, rods, and pipes. It can also be processed into insulating films, linings and complex products of various shapes through secondary processing. [0003] CN201610716569.7 discloses a polytetrafluoroethylene suspension resin and a prepa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F114/26C08F2/18C08F2/44C08G77/46C08L83/12
CPCC08F114/26C08F2/18C08F2/44C08G77/46C08L83/12
Inventor 孟庆文钱庆东余考明陈伟峰姜海涛李书桐路迪
Owner ZHEJIANG JUSHENG FLUOROCHEM