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Terminal group treatment method of PTFE (polytetrafluoroethylene) suspension resin

A processing method and technology for suspending resin, applied in lighting and heating equipment, drying, furnace types, etc., can solve the problem of needing hundreds of meters, and achieve the effect of improving processing performance

Active Publication Date: 2014-03-26
ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] However, the researchers found that the flow velocity of the material flowing in the airflow drying must reach at least 20m / s, and if the residence time of the material in the dryer is to be extended to a few minutes, the length of the drying pipe needs to be hundreds of meters in theory. m, simply replacing the drying duct does not solve the above problems

Method used

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  • Terminal group treatment method of PTFE (polytetrafluoroethylene) suspension resin
  • Terminal group treatment method of PTFE (polytetrafluoroethylene) suspension resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Take a PTFE suspension resin synthesized by a certain production as an example, and dry it, such as figure 2 Shown:

[0035] 1). The air in the air duct at a flow rate greater than 20m / s enters the hot air blower after coarse-effect filtration, is preheated to 120°C by the waste heat recovery device, and then enters the electric heater through the medium-efficiency filter to be heated to 360°C. The filter enters the vibrating fluidized bed;

[0036] 2) The PTFE wet material after vibrating and sieving water enters the vibrating fluidized bed at 600kg / h, staying for 15 minutes, and controlling the temperature in the vibrating fluidized bed to 270℃, so that the PTFE wet material and air are fully under high temperature conditions. Contact, cracking to generate a mixed gas of sulfur trioxide and carbon dioxide;

[0037] 3) After the cracking, the dried PTFE material is reduced to 30°C by a cold air mixer, and is separated by a cyclone separator and then packaged. The separated...

Embodiment 2

[0040] The wet PTFE material was dried by the method of Example 1.

[0041] Among them, in step 2), the temperature in the vibrating fluidized bed is 290°C; in step 3), the dried PTFE material is reduced to 20°C by a cold air mixer;

[0042] After the separation of the finished PTFE product, the yield of the finished product is 98%, and its water content is 0.011%. Using infrared detection, the finished PTFE product contains only 15% of the end groups compared to the wet PTFE material.

Embodiment 3

[0044] The wet PTFE material was dried by the method of Example 1.

[0045] Among them, in step 2), the temperature in the vibrating fluidized bed is 250°C; in step 3), the dried PTFE material is reduced to 35°C by a cold air mixer;

[0046] After the separation of the finished PTFE product, the yield rate of the finished product is 98%, and its water content is 0.012%. Using infrared detection, the finished PTFE product contains only 25% of the end groups compared to the wet PTFE material.

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Abstract

The invention relates to a terminal group treatment method of PTFE (polytetrafluoroethylene) suspension resin. In a PTFE wet material drying process, a PTFE wet material is mixed with the air in a vibrating fluidized bed to obtain dry PTFE, wherein terminal groups of the PTFE wet material are cracked into sulfur trioxide and carbon dioxide gas. Compared with the conventional process, the terminal group treatment method has the advantages as follows: the water content of the PTFE resin treated by the terminal group treatment method is reduced to 0.01% and the processing performance thereof is significantly improved; 80% of the terminal groups are cracked into sulfur trioxide and carbon dioxide gas, so that waste heat is utilized to achieve a purpose of energy conservation and emission reduction.

Description

Technical field [0001] The invention relates to a method for processing PTFE suspension resin end groups, which belongs to the field of polymer materials. Background technique [0002] The synthesis of suspended PTFE resin generally includes several steps such as polymerization, pulverization, and drying. The traditional polymerization process is to add inorganic initiator (persulfate, etc.) and deionized water into the reactor, and then pass the TFE monomer to maintain a certain temperature and pressure for polymerization reaction, and finally get PTFE suspension resin . The polymerization reaction mechanism is as follows: [0003] 1) Chain initiation: including the decomposition of initiator into primary free radicals and the addition of primary free radicals to monomers to form monomer free radicals. [0004] Redox system: S 2 O 8 2- +Fe 2+ —SO 4 2- +SO 4 — ·+Fe 3+ [0005] S 2 O 8 2- +HSO 3 — —SO 4 2- +SO 4 — ·+HSO 3 · [0006] Chain growth: tetrafluoroethylene reacts with mo...

Claims

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Application Information

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IPC IPC(8): C08F6/24F26B3/092
Inventor 张金刚李瑞涛曾本忠张建新陈炯
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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