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Production method of polytetrafluoroethylene granular powder

The technology of polytetrafluoroethylene micropowder and polytetrafluoroethylene is applied in the manufacturing field of polytetrafluoroethylene granular powder, which can solve the problems of entrained organic solvent, reduced product performance and high energy consumption.

Active Publication Date: 2010-12-01
SHANGHAI 3F NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] ii) The granulation process needs to be cooled first and then heated. As a result, the granulation time is long and the energy consumption is high: in order to fully disperse the PTFE micropowder, in addition to adding a high proportion of solvent, a low temperature environment is also required so that the agglomerated PTFE The fine powder is loose, and the solvent needs to be evaporated and recovered at high temperature, so the existing method requires a process of low temperature first and then high temperature, which increases energy consumption; and
[0017] iii) There are many organic solvents entrained in the prepared polytetrafluoroethylene micropowder, which reduces product performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] In a 0.15M equipped with a conical belt stirrer 3 At the collection port of the mixer, quantitatively and continuously collect 70Kg of 10°C polytetrafluoroethylene powder from fluidized bed jet milling, the collection speed is 400Kg per hour, and the average particle size of polytetrafluoroethylene powder is 20μm. Polytetrafluoroethylene micropowder and 10 liters of synchronously atomized trichlorethylene are collected at the cylindrical collection port of the mixer (with 4 uniformly distributed nozzles at an elevation angle of 60° from the horizontal, the pressure at the nozzle inlet is 0.3Mpa, and the solvent mist The particle size of the particles is 110 microns) and mix evenly, the mixing temperature is 14°C, after the mixing is completed, the agitator of the mixer is turned on, the stirring speed is 23rpm, and the stirring time is 5 minutes. In a 0.42M equipped with a stirrer 3 Add 230 liters of deionized water at 20°C into the granulation tank, add the premixed m...

Embodiment 2

[0057] In a 0.15M equipped with a conical belt stirrer 3 At the collection port of the mixer, quantitatively and continuously collect 70Kg of 10°C polytetrafluoroethylene powder from the fluidized bed airflow pulverization, the collection speed is 400Kg per hour, and the average particle size of the polytetrafluoroethylene powder is 20μm. Polytetrafluoroethylene micropowder and 20 liters of synchronously atomized trichlorethylene are placed in a cylindrical mixer (with 4 uniformly distributed nozzles at an elevation angle of 40° from the horizontal, the pressure at the nozzle inlet is 0.7Mpa, and the solvent mist particles The particle size is 110 microns) and the collection port is uniformly mixed, and the mixing temperature is 15° C. After the mixing is completed, the agitator of the mixer is turned on, the stirring speed is 23 rpm, and the stirring time is 8 minutes. In a 0.42M equipped with a stirrer 3 Add 260 liters of deionized water at 21°C into the granulation tank, a...

Embodiment 3

[0059] In a 0.15M equipped with a conical belt stirrer 3 At the collection port of the mixer, quantitatively and continuously collect 70Kg of 10°C polytetrafluoroethylene powder from the fluidized bed airflow pulverization, the collection speed is 400Kg per hour, and the average particle size of the polytetrafluoroethylene powder is 20μm. Polytetrafluoroethylene micropowder and 30 liters of synchronously atomized trichlorethylene are collected at the cylindrical collection port of the mixer (with 4 uniformly distributed nozzles at an elevation angle of 60° from the horizontal, the pressure at the nozzle inlet is 0.7Mpa, and the solvent mist The particle size of the particles is 120 microns) and mix uniformly, and the mixing temperature is 17° C. After the mixing is completed, the agitator of the mixer is turned on, the stirring speed is 23 rpm, and the stirring time is 8 minutes. In a 0.42M equipped with a stirrer 3 Add 290 liters of deionized water at 20°C into the granulati...

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Abstract

The invention discloses a production method of polytetrafluoroethylene granular powder, comprising the following steps of: (a) preparing polytetrafluoroethylene crude granules by using a suspension method to polymerize; (b) crushing, washing and drying the polytetrafluoroethylene crude granules to obtain polytetrafluoroethylene micro powder; (c) contacting the polytetrafluoroethylene micro powder obtained by the step (b) with the atomized organic liquid in a mixer so that the organic liquid is coated on the polytetrafluoroethylene micro powder; and (d) granulating in a water phase of a granulating groove. The method has the advantages of high continuous degree, low energy consumption, uniform granularity and favorable product performance.

Description

technical field [0001] The invention relates to a method for manufacturing polytetrafluoroethylene granular powder. The production method of the present invention has the advantages of low solvent consumption and no special low-temperature dispersion step. Background technique [0002] PTFE is a material with excellent performance. It is resistant to aging, has good chemical stability, excellent electrical insulation and good lubricity, and has a wide range of operating temperatures. It is widely used in various industries. Common PTFE materials include suspended PTFE, PTFE fine particles and micropowders, and PTFE granular powder. The suspended polytetrafluoroethylene refers to a polytetrafluoroethylene product obtained by a suspension method. [0003] In this field, the term "polytetrafluoroethylene fine particles and micropowders" can usually be used interchangeably with "polytetrafluoroethylene fine particles" or "polytetrafluoroethylene micropowders", referring to tho...

Claims

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Application Information

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IPC IPC(8): C08L27/18C08J3/12
Inventor 刘家禹张志刚宋黎峰林青松
Owner SHANGHAI 3F NEW MATERIAL TECH CO LTD
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