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Method for manufacturing ultrafine powder from polytetrafluoroethylene through irradiation cracking

A polytetrafluoroethylene and ultra-fine powder technology, applied in grain processing and other directions, can solve the problems of large particle size of polytetrafluoroethylene fine powder, a large amount of toxic substances, and a large amount of organic solvents, and achieves easy operation and maintenance. Application prospects and stable product performance

Inactive Publication Date: 2012-09-19
四川久远科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the manufacturing methods of polytetrafluoroethylene ultrafine powder include telomerization method, mechanical pulverization method, thermal cracking method, etc., but these methods have certain defects, such as the particles prepared by telomerization method are not uniform, easy to Agglomeration, and the amount of organic solvent is large, which is easy to cause environmental pollution; and the PTFE fine powder obtained by the mechanical pulverization method has a large particle size, which greatly reduces its application range, and the thermal cracking method is complex and requires high investment. produces a large amount of toxic substances

Method used

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  • Method for manufacturing ultrafine powder from polytetrafluoroethylene through irradiation cracking

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Put the polytetrafluoroethylene powder into an oven for drying, the temperature of the oven is 60° C., and the drying time is 3 hours. Then, after the dried polytetrafluoroethylene powder is cold-treated with liquid nitrogen, it is sealed and packaged under the condition of filling nitrogen gas, and the packaged polytetrafluoroethylene powder 1 is placed on the flat trolley 2, and the trolley is driven by The ground chain system 3 is pulled into the irradiation hall, and the high-energy electron beam is irradiated and cracked through the scanning window 4. The irradiation dose is 80kGy, and the number of irradiations is 6 times. The package needs to be turned over every time it passes through the scanning window. The irradiated polytetrafluoroethylene powder is subjected to airflow crushing and classification. The airflow pressure of the airflow mill is 0.94MPa, and the number of airflow cycles is 15 times to obtain ultrafine polytetrafluoroethylene powder with a particl...

Embodiment 2

[0028] Put the waste polytetrafluoroethylene into an oven for drying, the temperature of the oven is 70°C, and the drying time is 3 hours. Then cold-treat the dried waste PTFE with liquid nitrogen, put it into a pulverizer for pulverization, the speed of the pulverizer is 4200 r / min, and the time is 15 minutes to obtain granular particles with a particle size of 80-130 μm. powder. Under the condition of filling oxygen, carry out sealed packaging, put the packaged polytetrafluoroethylene powder 1 on the flat trolley 2, the trolley is pulled by the ground chain system 3 into the irradiation hall, and radiate high-energy electron beams through the scanning window 4 For radiation lysis, the irradiation dose is 60kGy, and the number of irradiations is 4 times. The packaging needs to be turned over every time the scanning window passes through. The irradiated polytetrafluoroethylene powder is subjected to airflow crushing and classification, the airflow pressure of the airflow mill...

Embodiment 3

[0030] A method for producing superfine powder by irradiation cracking of polytetrafluoroethylene, comprising the following steps:

[0031] a. Raw material drying: drying the polytetrafluoroethylene raw material;

[0032] B, low temperature treatment: the polytetrafluoroethylene raw material after the drying is carried out low-temperature cold treatment with liquid nitrogen (concrete method can be: after the polytetrafluoroethylene raw material after the drying is packed with low-temperature resistant container, be placed in liquid nitrogen and take out after rapid cooling , making the PTFE raw material brittle and easier to crush);

[0033] c. Pulverization: pulverize the polytetrafluoroethylene raw material after low-temperature treatment with a pulverizer, and pulverize it into a powder with a particle size of 100-1000 μm;

[0034] d. Sealed packaging: under gas protection, the powder is sealed and packaged;

[0035] e. Irradiation cracking: Put the packaged powder into t...

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Abstract

The invention discloses a method for manufacturing ultrafine powder from polytetrafluoroethylene through irradiation cracking. The method is characterized in that polytetrafluoroethylene raw materials are dried; the dried polytetrafluoroethylene raw materials are subjected to low-temperature cold treatment by liquid nitrogen; the polytetrafluoroethylene raw materials subjected to the low-temperature treatment are crushed into powder materials with the particle diameter being 100-1000mum by a crushing machine; the powder materials are subjected to sealed package under the gas protection effect; the packed powder materials are placed into an electronic accelerator irradiation system for irradiation cracking; and the irradiated powder materials pass through an air flow crushing machine to be subjected to air flow crushing and grading, and the ultrafine polytetrafluoroethylene powder with the particle diameter reaching 0.2-3mum is obtained. The method has the characteristics that the preparation process is simple, the control is easy, the energy consumption is low, the process continuous degree is high, the product performance is stable, the prepared ultrafine polytetrafluoroethylene powder has the characteristics that the dispersibility is good, and the agglomeration cannot easily occur. The prepared ultrafine polytetrafluoroethylene powder can be widely applied to the fields of paint, ink, dray powder lubricating agents and space flight and aviation appliances, and the material performance is obviously improved.

Description

technical field [0001] The invention belongs to a method for producing fine powder, and relates to a method for producing superfine powder by irradiating and cracking polytetrafluoroethylene. PTFE suitable for making ultra-fine powder. Background technique [0002] PTFE superfine powder is a white low molecular weight free-flowing powder, which has many advantages such as acid and alkali resistance, scratch resistance, non-stickiness, good lubricity and high flame retardancy, so it can be processed into mold release Agents, oil-free lubricants, anti-sticking agents, anti-corrosion sealants, etc., or as additives are widely used in lubricating greases, inks, coatings, explosives, engineering plastics, rubber and other materials. In the prior art, the manufacturing methods of polytetrafluoroethylene ultrafine powder include telomerization method, mechanical pulverization method, thermal cracking method, etc., but these methods have certain defects, such as the particles prepa...

Claims

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Application Information

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IPC IPC(8): B29C67/00B02C19/06B29K27/18
Inventor 李凤娟舒乾治罗立波卢涛王海涛李艳波薛小明
Owner 四川久远科技股份有限公司
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