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

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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

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  • Method for manufacturing ultrafine powder from polytetrafluoroethylene through irradiation cracking

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0025] Example 1:

[0026] Put the polytetrafluoroethylene powder into an oven for drying, the oven temperature is 60°C, and the drying time is 3h. Then, the dried PTFE powder is cold treated with liquid nitrogen, and then sealed and packaged under the condition of nitrogen gas. The packaged PTFE powder 1 is placed on the flat car 2 and the car is The ground-link system 3 is drawn into the irradiation hall, and passes through the scanning window 4 to radiate high-energy electron beam radiation. The irradiation dose is 80kGy, and the number of irradiation is 6 times. The package needs to be turned over each time the scanning window passes through. The irradiated polytetrafluoroethylene powder is pulverized and classified by airflow. The airflow pressure of the airflow mill is 0.94MPa, and the number of airflow cycles is 15 times, and the ultrafine PTFE powder with a particle size of 0.2~3μm can be obtained. .

Example Embodiment

[0027] Example 2:

[0028] Put the waste polytetrafluoroethylene into an oven for drying. The oven temperature is 70°C and the drying time is 3h. Then the dried waste polytetrafluoroethylene is cold treated with liquid nitrogen, and then put into a pulverizer for pulverization. The rotation speed of the pulverizer is 4200 rpm and the time is 15 minutes, and the particles with a particle size of 80-130 μm can be obtained. powder. Under the condition of oxygen filling, the package is sealed and the packaged PTFE powder 1 is placed on the flatbed trolley 2. The trolley is drawn by the ground chain system 3 into the irradiation hall, and the high-energy electron beam is emitted through the scanning window 4 Radiation cracking, the irradiation dose is 60kGy, the number of irradiation is 4 times, and the package needs to be turned over each time through the scanning window. The irradiated polytetrafluoroethylene powder is pulverized and classified by airflow. The airflow pressure of ...

Example Embodiment

[0029] Example 3:

[0030] A method for producing superfine powder by pyrolysis of polytetrafluoroethylene by radiation, including the following steps:

[0031] a. Drying of raw materials: drying the raw materials of PTFE;

[0032] b. Low temperature treatment: The dried PTFE raw material is treated with liquid nitrogen for low temperature cold treatment (the specific method can be: the dried PTFE raw material is packaged in a low temperature resistant container and placed in liquid nitrogen for rapid cooling and then taken out , Make the PTFE raw material brittle and thus easier to crush);

[0033] c. Crushing: pulverize the low-temperature processed polytetrafluoroethylene raw material with a pulverizer and pulverize into powder with a particle size of 100-1000μm;

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

[0035] e. Irradiation cracking: Put the packaged powder into the electron accelerator irradiation system for radiation cracking; the num...

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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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