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Method for recovering dispersion PTFE resin

A technology of PTFE and resin, which is applied in the field of recycling and dispersing PTFE resin, can solve the problems of waste of land resources, waste of resources, complicated process, etc., achieve good social and economic benefits, reduce land occupation, and optimize process parameters.

Inactive Publication Date: 2007-12-05
JUHUA GROUP TECH CENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If it is buried, it will not only waste land resources, but also cause secondary pollution; if it is burned, it will waste resources and produce toxic gases such as fluorophosgene, which seriously pollutes the air.
Generally, there are three main ways to use this kind of waste dispersed PTFE resin: (1) recover tetrafluoroethylene monomer through pyrolysis, but the process is complicated, the processing cost is high, and the material requirements of processing equipment are harsh
(2) Combustion of PTFE waste to recover the heat released by its combustion, this method has not yet been used in industry, and the flue gas produced by combustion is toxic and easy to cause secondary pollution
However, due to the complex composition of waxy PTFE waste residue, the above method cannot be used for processing.
[0003] Through the search of patents and public literature, there is no method for recycling waxy dispersed PTFE waste residue, which is generally only used for landfill disposal in China.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] First add 35kg of No. 60 industrial petroleum ether into a 100L leaching tank with stirring, add 10kg of fully washed and broken waxy PTFE waste residue (the paraffin content in the waste residue is about 5%) under stirring, and leaching for 0.3 hours at 35°C , Filter under 0.3MPa pressure control.

[0018] Recover 9.2 kg of dispersed PTFE resin (tensile strength 23.6 MPa, elongation at break 487%), and 0.5 kg of paraffin wax.

Embodiment 2

[0020] First add 40kg of No. 60 industrial petroleum ether into a 100L leaching kettle, add 10kg of fully washed and broken waxy PTFE waste residue (the paraffin content in the waste residue is about 20%) under stirring, leaching at 35°C for 0.5 hours, after two times Leaching, pressure control at 0.2MPa and filtration.

[0021] Recover 7.8 kg of dispersed PTFE resin (tensile strength 22.8 MPa, elongation at break 421%), and 1.9 kg of paraffin wax.

Embodiment 3

[0023] First add 40kg of No. 90 industrial petroleum ether into a 100L leaching kettle, add 10kg of fully washed and broken waxy PTFE waste residue (the paraffin content in the waste residue is about 60%) under stirring, and leaching for 1 hour at 45°C. Take and filter under 0.25MPa pressure control.

[0024] Recover 3.4 kg of dispersed PTFE resin (tensile strength 22.6 MPa, elongation at break 384%), and 5.8 kg of paraffin wax.

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Abstract

The present invention is technological process of treating paraffin dispersed PTFE waste to recover PTFE and paraffin. The process includes the steps of sorting, washing, crushing, extracting with organic solvent, filtering and rectifying, and possesses the features of mild operation condition, no toxicity of the leaching agent, low cost, high yield, environment friendship, etc.

Description

technical field [0001] The invention relates to a method for recovering dispersed PTFE resin, in particular to a method for recovering dispersed PTFE resin in waxy PTFE waste residue during the production and processing of dispersed PTFE. Background technique [0002] According to the properties of dispersed polytetrafluoroethylene (PTFE) resin, landfill or incineration are generally used in domestic and foreign disposal of such resin waste, but there are many problems in terms of actual treatment effect. If it is buried, it will not only waste land resources, but also cause secondary pollution; if it is burned, it will waste resources and produce toxic gases such as fluorophosgene, which seriously pollutes the air. Generally, there are three main ways to utilize such waste dispersed PTFE resins: (1) Recycling tetrafluoroethylene monomer through pyrolysis, but this method is complex in process, high in processing costs, and requires harsh materials for processing equipment. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/08C08L27/18
CPCY02W30/62
Inventor 吴奕
Owner JUHUA GROUP TECH CENT
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