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Method for preparation of ultrafine PTFE powder by combining electron beams with hydrogen peroxide and carbon tetrachloride

A technology of carbon tetrachloride and hydrogen peroxide, applied in the chemical industry, can solve the problems of high production cost and increased production cost, and achieve the effects of stable product performance, easy control, and improved degradation efficiency

Inactive Publication Date: 2013-08-21
佛山市棱致塑胶电器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the production cost of irradiation with electron beam and Co-60 gamma ray radiation equipment is very high, and the need for high standards of safety protection further increases the production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A kind of method that electron beam combines hydrogen peroxide and carbon tetrachloride to prepare PTFE superfine powder, comprises the steps:

[0044] 1) Pack the dry polytetrafluoroethylene raw material in a low-temperature-resistant container, place it in liquid nitrogen, and take it out after quenching;

[0045] 2) Grinding the PTFE raw material after quenching treatment with a pulverizer, the particle size after pulverization is 100-1000 μm;

[0046] 3) Place the pulverized polytetrafluoroethylene raw material in the sealed cavity on the circulating trolley of the electron accelerator;

[0047] 4) Turn on the spraying device, and the spraying device sprays carbon tetrachloride on the polytetrafluoroethylene raw material on the circulating trolley, and the sprayed carbon tetrachloride and the polytetrafluoroethylene on the circulating trolley The weight ratio of ethylene raw material is 5%;

[0048] 5) Turn on the electron accelerator, which generates high-energy ...

Embodiment 2

[0052] A kind of method that electron beam combines hydrogen peroxide and carbon tetrachloride to prepare PTFE superfine powder, comprises the steps:

[0053] 1) Pack the dry polytetrafluoroethylene raw material in a low-temperature-resistant container, place it in liquid nitrogen, and take it out after quenching;

[0054] 2) Grinding the PTFE raw material after quenching treatment with a pulverizer, the particle size after pulverization is 100-1000 μm;

[0055] 3) Place the pulverized polytetrafluoroethylene raw material in the sealed cavity on the circulating trolley of the electron accelerator;

[0056] 4) Turn on the spraying device, and the spraying device sprays hydrogen peroxide on the polytetrafluoroethylene raw material on the circulating trolley, and the weight ratio of the sprayed hydrogen peroxide to the polytetrafluoroethylene raw material on the circulating trolley is 5%;

[0057] 5) Turn on the electron accelerator, which generates high-energy electron beams t...

Embodiment 3

[0061] A kind of method that electron beam combines hydrogen peroxide and carbon tetrachloride to prepare PTFE superfine powder, comprises the steps:

[0062] 1) Pack the dry polytetrafluoroethylene raw material in a low-temperature-resistant container, place it in liquid nitrogen, and take it out after quenching;

[0063] 2) Grinding the PTFE raw material after quenching treatment with a pulverizer, the particle size after pulverization is 100-1000 μm;

[0064] 3) Place the pulverized polytetrafluoroethylene raw material in the sealed cavity on the circulating trolley of the electron accelerator;

[0065] 4) Turn on the spraying device, and the spraying device sprays carbon tetrachloride and hydrogen peroxide on the polytetrafluoroethylene raw material on the circulating trolley, and the sprayed carbon tetrachloride and the polytetrafluoroethylene on the circulating trolley The weight ratio of tetrafluoroethylene raw material is 5%, and the weight ratio of the hydrogen perox...

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Abstract

The invention relates to a method for preparation of ultrafine PTFE (polytetrafluoroethylene) powder by combining electron beams with hydrogen peroxide and carbon tetrachloride. The method comprises: packaging a dried PTFE raw material with a low temperature resistant container and putting the container in liquid nitrogen to undergo quenching, and then taking it out; comminuting the quenched PTFE raw material by a comminutor; putting the comminuted PTFE raw material on a cycling trolley of an electron accelerator; starting a spraying device of the electron accelerator to spray carbon tetrachloride and hydrogen peroxide to the PTFE raw material on the cycling trolley; starting the electron accelerator, which generates high energy electron beams to irradiate the PTFE raw material; putting the irradiated PTFE into an airflow pulverization system to undergo complete pulverizing and classification, thus obtaining the ultrafine PTFE powder with a particle size of less than 5 micrometers. The preparation method provided in the invention is simple, can reduce the irradiation time and irradiation dose so as to lower the cost, and increases the degradation rate of PTFE.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for preparing PTEE superfine powder by electron beam irradiation combined with hydrogen peroxide and carbon tetrachloride. Background technique [0002] Polytetrafluoroethylene (PTFE) ultrafine powder is a low molecular weight fine powder, also known as "PTFE wax". The average particle size of PTFE ultrafine powder is less than 5μm, and the specific surface area is greater than 10m 2 / g, the friction coefficient is about 0.06-0.07, it has good lubricity and can be well dispersed in many materials. [0003] The purity of PTFE products is 100%, the molecular weight is less than 10,000, and the PTFE micropowder series with a particle size of 0.5 μm not only maintains the original excellent properties of PTFE, but also has many unique properties, such as no self-coagulation, no Electrostatic effect, good compatibility, low molecular weight, good dispersibility. H...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C21/00B02C19/06C08J3/28
Inventor 顾建忠吴明红蔡建球
Owner 佛山市棱致塑胶电器有限公司
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