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A method for continuous extraction and recovery of polytetrafluoroethylene dispersed resin

A technology of dispersing resin and extractor, which is applied in the field of continuous extraction and recovery of polytetrafluoroethylene dispersing resin, can solve the problems that the paraffin content index cannot meet the requirements, too many unit operations, and unfavorable large-scale application, etc., and achieve a good society Benefits and economic benefits, high yield, and effective reuse

Active Publication Date: 2021-04-27
ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The Chinese patent (publication number: CN101081908A) applied by its company discloses a method for reclaiming and dispersing PTFE resins. After sorting, washing, crushing, leaching with organic solvents, filtering, and rectifying waste residues containing dispersed PTFE, they obtain Dispersing PTFE recycled materials and paraffin, this method has too many unit operations, and the paraffin content index in some crude PTFE recycled materials often does not meet the requirements, requiring secondary leaching, and the shortcomings of the used organic materials such as explosives are not conducive to large-scale industrial application

Method used

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  • A method for continuous extraction and recovery of polytetrafluoroethylene dispersed resin
  • A method for continuous extraction and recovery of polytetrafluoroethylene dispersed resin
  • A method for continuous extraction and recovery of polytetrafluoroethylene dispersed resin

Examples

Experimental program
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Embodiment 1

[0039] This embodiment provides a method for continuous extraction and recovery of tetrafluoroethylene dispersed resin, comprising the steps of:

[0040] 1) Soak the extraction sleeve in the extractor in chloroform for 8 hours; then put it in the temperature of 105°C and dry it for 2 hours, and accurately weigh 47.90g;

[0041] 2) the PTFE waste residue containing paraffin with a moisture content not higher than 10% is placed in the extraction sleeve, and accurately weighs 59.95g (the weight of the extraction sleeve after adding the PTFE waste residue, that is, the amount of PTFE waste residue is 12.05g); carefully put it into the Soxhlet extractor, and the extractor was kept warm with glass fiber cloth;

[0042] 3) Use chloroform as the organic solvent for the extraction treatment, connect the various parts of the extractor, connect the condensed water, and carry out the extraction treatment at a constant temperature of 62° C. for 5 hours;

[0043]Wherein, the weight-to-volu...

Embodiment 2

[0049] This embodiment provides a method for continuous extraction and recovery of tetrafluoroethylene dispersed resin, the specific operation steps are the same as in Example 1, the difference is only in:

[0050] Step 2) in waxy PTFE waste residue add-on is 15.03g;

[0051] In step 4), "perform row extraction for 5 hours" is replaced by "perform extraction for 4 hours";

[0052] Finally, 6.97g of recycled PTFE was obtained, the wax content was 3.85% in the sample sent and the extraction rate was 96.3% in comprehensive analysis.

Embodiment 3

[0054] This embodiment provides a method for continuous extraction and recovery of tetrafluoroethylene dispersed resin, the specific operation steps are the same as in Example 1, the difference is only in:

[0055] Step 2) in waxy PTFE waste residue add-on is 14.36g;

[0056] In step 4), "perform row extraction for 5 hours" is replaced by "perform extraction for 6 hours";

[0057] Finally, 6.68g of recycled PTFE was obtained, and the wax content was 1.89% in the sample test, and the extraction rate of comprehensive analysis was 98.2%.

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Abstract

The invention relates to a method for continuously extracting and recovering polytetrafluoroethylene dispersed resin, which specifically comprises: placing PTFE waste residue containing paraffin wax with a water content not higher than 10% in an extractor for extraction treatment. The method of the invention has the characteristics of mild operating conditions, low cost, high yield, practicality and easy operation. It changes the current situation of waxy PTFE waste residue landfill faced by the fluorine chemical industry, realizes the effective reuse of resources, and has good social and economic benefits. After continuous extraction, the paraffin content in the final dispersed PTFE recycled material is ≦5%, and the paraffin recovery rate is ≧90%.

Description

technical field [0001] The invention belongs to the field of polymer substance recovery, and in particular relates to a method for continuously extracting and recovering polytetrafluoroethylene dispersed resin. Background technique [0002] Polytetrafluoroethylene dispersion resin is an important chemical product, which is a high polymer produced by polymerization of tetrafluoroethylene monomer. It has a wide range of uses and can be used to process small rods, tubes, raw material tapes and other products with fine shapes. With the development of the economy, the product of PTFE dispersion resin will play a more important role in many fields. Its industrial production process is generally to add a certain amount of deionized water, emulsifier, initiator, stabilizer and other additives to the polymerization kettle, then close the polymerization kettle, start stirring, carry out pressure holding test and vacuum test, and use high-purity Nitrogen is repeatedly replaced to rem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J11/08C08L27/18C08L91/06
CPCC08J11/08C08J2327/18C08J2491/06Y02W30/62
Inventor 罗源军刘波张鸣陈立义
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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