A kind of processing method of ptfe suspension resin end group

A treatment method, a technique of suspending resin, applied in the direction of lighting and heating equipment, drying, furnace type, etc., can solve the problem of needing hundreds of meters, and achieve the effect of improving processing performance

Active Publication Date: 2016-01-06
ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of processing method of ptfe suspension resin end group
  • A kind of processing method of ptfe suspension resin end group

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

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

[0037] 3) After the pyrolysis, the dried PTFE material is cooled to 30°C by the cold air mixer, and is separated by the cyclone separator before packaging, and th...

Embodiment 2

[0040] Dry process PTFE wet material with the method for embodiment 1.

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

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

Embodiment 3

[0044] Dry process PTFE wet material with the method for embodiment 1.

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

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

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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 treating end groups of PTFE suspension resins, belonging to the field of polymer materials. Background technique [0002] The synthesis of suspended PTFE resin generally includes several steps such as polymerization reaction, crushing, and drying. The traditional polymerization process is to add inorganic initiators (persulfate, etc.) and deionized water into the reactor, and then feed TFE monomer to maintain a certain temperature and pressure for polymerization reaction, and finally obtain PTFE suspension resin . The polymerization reaction mechanism is as follows: [0003] 1) Chain initiation: including the decomposition of the initiator into primary free radicals and the addition of primary free radicals to monomers to form monomeric 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 Growt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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