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A kind of preparation method of polytetrafluoroethylene particle

A polytetrafluoroethylene and particle technology is applied in the field of preparation of polytetrafluoroethylene particles, which can solve the problems of reduced product performance, not easy to volatilize and clean, large solvent consumption, etc., and achieves the effect of increasing rotational speed, uniform particles, and good fluidity

Active Publication Date: 2018-12-07
JINAN SINOFLON NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: low temperature is required to prevent polytetrafluoroethylene micro-powder from agglomerating, and the solvent needs to be recovered by raising the temperature. First, low temperature and then high temperature increase energy consumption; and the amount of solvent is large, which is not easy to volatilize and clean, and the entrainment of organic solvent will reduce the performance of the product.

Method used

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  • A kind of preparation method of polytetrafluoroethylene particle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Take 100kg of polytetrafluoroethylene fine powder (the suspension fine powder CGM16F of Zhonghao Chenguang Chemical Industry Research Institute, the average particle size is 25 microns) and add it to a clean container, and spray the mixed liquid of 20kg of ethanol and deionized water on the polytetrafluoroethylene In the tetrafluoroethylene fine powder, the mass ratio of ethanol mass to water is 2:1. After standing for 5 hours, place it under a stirrer at 20 rpm and stir for 15 minutes to disperse the polytetrafluoroethylene fine powder at one time.

[0026] (2) Put the polytetrafluoroethylene fine powder mixed with the solvent into the granulator continuously, the speed is 3200rpm, and the fine powder is broken into small particles for the second time, and the small particles are extruded from the sieve plate, the sieve plate aperture is 0.5mm, Made into primary particles.

[0027] (3) The primary particles are put into the horizontal turntable compaction machine a...

Embodiment 2

[0030] (1) Take 100kg of polytetrafluoroethylene fine powder (Shandong Dongyue Polymer Material Co., Ltd. suspension fine powder DF-16A average particle size 5 microns), add it to a clean container, mix 50kg of isopropanol and deionized water The liquid is sprayed into the above-mentioned polytetrafluoroethylene fine powder, the mass ratio of isopropanol mass to water is 3:1, after standing for 10 hours, it is placed under the agitator of 50rpm and stirred for 30 minutes, and the polytetrafluoroethylene fine powder Once broken up.

[0031] (2) Put the polytetrafluoroethylene fine powder mixed with the solvent into the granulator continuously, the speed is 3500rpm, and the fine powder is broken into small particles for the second time, and the small particles are extruded from the sieve plate, the sieve plate aperture is 2.0mm, Made into primary particles.

[0032] (3) The primary particles are put into the horizontal turntable compacting machine at a rate of 10kg each time. T...

Embodiment 3

[0035] (1) Take 100kg of polytetrafluoroethylene fine powder (Zhonghao Chenguang Chemical Research Institute suspension fine powder CGM16F average particle size of 22 microns), add it to a clean container, and spray 40kg of isopropanol and deionized water mixed liquid on the In the above polytetrafluoroethylene fine powder, the mass ratio of isopropanol to water is 3:2. After standing for 7 hours, place it under the agitator of 30rpm and stir for 15 minutes to disperse the polytetrafluoroethylene fine powder at one time.

[0036] (2) Put the polytetrafluoroethylene fine powder mixed with the solvent into the granulator continuously, the speed is 4000rpm, and the fine powder is broken into small particles for the second time, and the small particles are extruded from the sieve plate, the sieve plate aperture is 0.8mm, Made into primary particles.

[0037] (3) The primary particles are put into the horizontal turntable compaction machine at a rate of 10kg each time. The chassis ...

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Abstract

The invention relates to a preparation method of polytetrafluoroethylene particles. The preparation method comprises adding a mixed solvent into polytetrafluoroethylene fine powder, carrying out standing and stirring, putting the mixture into a pelletizer, preparing primary particles, carrying out compaction through a compaction machine and carrying out drying to obtain polytetrafluoroethylene particles. The polytetrafluoroethylene particles have the average grain diameter of 300-700 microns and particle bulk density of 850-900g / l. The preparation method solves micro-powder agglomeration, is free of temperature control in production so that energy consumption is reduced, and consumes less organic solvent or water. The polytetrafluoroethylene particles are uniform and have regular shapes, narrow particle size distribution and good fluidity.

Description

technical field [0001] The invention relates to a granulation process, in particular to a preparation method of polytetrafluoroethylene granules. Background technique [0002] PTFE is an engineering plastic with excellent performance, which is widely used in various industries. Due to its high melting temperature and high melt viscosity, it is not suitable for ordinary plastic melt extrusion and melt injection molding methods. [0003] The polytetrafluoroethylene powder obtained by the suspension method has low bulk density, poor fluidity, and is easy to agglomerate, so it can only be used for ordinary manual molding, but it is not satisfactory for automatic molding and small or thin-walled parts with high precision. By granulating PTFE powder, the bulk density of PTFE can be increased, its fluidity can be improved, and it can meet the processing requirements of high-productivity automatic molding and some fine products. [0004] The existing granulation technology is main...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29B9/06B29B9/16B29B13/06
CPCB29B9/06B29B9/16B29B13/065
Inventor 谭江玲窦圣堂王化文杨丽
Owner JINAN SINOFLON NEW MATERIAL CO LTD