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Anti-static polytetrafluoroethylene membrane and preparation method thereof

A technology of polytetrafluoroethylene and antistatic film, which is applied in the field of polytetrafluoroethylene antistatic film and its preparation, can solve the problem of antistatic property of polytetrafluoroethylene antistatic film, unsatisfactory performance of elongation at break and promotion of dispersion Limited effect, complex preparation process and other issues, to achieve excellent thermal stability, improve antistatic performance and tensile strength, good mechanical and electrical properties

Active Publication Date: 2018-12-28
ZHEJIANG DEQING CONCEPTFE PLASTIC PROD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The weak point of this polytetrafluoroethylene antistatic film is: (1) preparation process is comparatively complicated; The degree of dispersion in PTFE, but the dispersion-promoting effect of isoparaffin organic solvent oil is very limited. In the subsequent billet making process, conductive carbon black is very easy to agglomerate, resulting in the deterioration of PTFE antistatic film. Unsatisfactory properties such as antistatic property and elongation at break

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In this embodiment, a method for preparing a polytetrafluoroethylene antistatic film includes the following steps:

[0035] (1) Preparation of modified carbon black;

[0036] The carbon black is placed at 100-110℃ for drying for more than 25 hours, and after cooling, it is mixed with N-(benzocyclobuten-4-yl)maleimide at a mass ratio of 100:0.01, and in a high-speed mixer The medium is uniformly dispersed, and then transferred to a 150°C reactor for Diels-Alder reaction for 7 hours to obtain modified carbon black.

[0037] (2) Take 90% of polytetrafluoroethylene and 10% of modified carbon black by mass percentage, mix them evenly in a high-speed mixer, and place them in an oven at 100°C to remove water. After they are completely dried, Cool down;

[0038] (3) Put the cooled material into a mold and press it into a green body, and sinter it at 370-390°C;

[0039] (4) The sintered blank is placed on a rotary cutting machine and turned to 0.01-10 mm to obtain the polytetrafluoroeth...

Embodiment 2

[0041] In this embodiment, a method for preparing a polytetrafluoroethylene antistatic film includes the following steps:

[0042] (1) Preparation of modified carbon black;

[0043] The carbon black is dried at 100-110℃ for more than 25 hours, and after cooling, it is mixed with N-(benzocyclobuten-4-yl)maleimide at a mass ratio of 100:1, and then used in a high-speed mixer The medium is uniformly dispersed, and then transferred to a 150°C reactor for Diels-Alder reaction for 7 hours to obtain modified carbon black.

[0044] (2) Take 91% polytetrafluoroethylene and 9% modified carbon black by mass percentage, mix them evenly in a high-speed mixer, and place them in an oven at 100°C to remove water. After they are completely dried, Cool down;

[0045] (3) Put the cooled material into a mold and press it into a green body, and sinter it at 370-390°C;

[0046] (4) The sintered blank is placed on a rotary cutting machine and turned to 0.01-10 mm to obtain the polytetrafluoroethylene antist...

Embodiment 3

[0048] In this embodiment, a method for preparing a polytetrafluoroethylene antistatic film includes the following steps:

[0049] (1) Preparation of modified carbon black;

[0050] The carbon black is dried at 100-110℃ for more than 25h, and after cooling, it is mixed with N-(benzocyclobuten-4-yl)maleimide at a mass ratio of 100:5, and then used in a high-speed mixer The medium is uniformly dispersed, and then transferred to a 170°C reactor for Diels-Alder reaction for 4 hours to obtain modified carbon black.

[0051] (2) Take 92% polytetrafluoroethylene and 8% modified carbon black based on mass percentages, mix them in a high-speed mixer, and place them in a 100°C oven to remove water. After they are completely dried, Cool down;

[0052] (3) Put the cooled material into a mold and press it into a green body, and sinter it at 370-390°C;

[0053] (4) The sintered blank is placed on a rotary cutting machine and turned to 0.01-10 mm to obtain the polytetrafluoroethylene antistatic film...

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Abstract

The invention discloses an anti-static polytetrafluoroethylene membrane and a preparation method thereof. The anti-static polytetrafluoroethylene membrane is prepared from, by mass, 90-96% of polytetrafluoroethylene and 4-10% of modified carbon black. The modified carbon black is obtained by using N-(benzocyclobutene-4-yl) maleimide for conducting surface treatment on carbon black. N-(benzocyclobutene-4-yl) maleimide can improve the lipophilicity and dispersity of the carbon black, and therefore the carbon black can be uniformly dispersed in polytetrafluoroethylene without generation of carbonblack aggregates, so that the anti-static polytetrafluoroethylene membrane has a high breaking elongation rate and great anti-static performance. The carbon black modified by N-(benzocyclobutene-4-yl) maleimide can diminish vibration of the surface resistivity of a product. The decomposition temperature of the modified carbon black reaches 450 DEG C or above, so that the modified carbon black still has excellent thermal stability under the polytetrafluoroethylene processing temperature of 370-390 DEG C, and thermal decomposition cannot happen.

Description

Technical field [0001] The invention belongs to the technical field of polymer materials, and specifically relates to a polytetrafluoroethylene antistatic film and a preparation method thereof. Background technique [0002] Polytetrafluoroethylene (Teflon or PTFE), commonly known as "Plastic King", is a polymer compound formed by polymerization of tetrafluoroethylene. It has excellent chemical stability, corrosion resistance, airtightness, high lubrication, non-sticking, and electrical conductivity. Insulation and good anti-aging endurance. Used as engineering plastics, it can be made into polytetrafluoroethylene pipes, rods, strips, plates, films, etc.; generally used in corrosion-resistant pipes, containers, pumps, valves, radar, high-frequency communication equipment, Radio equipment, etc. [0003] By adding fillers to polytetrafluoroethylene, new properties can be given to PTFE. For example, the Chinese invention patent application with the application number CN201610070699....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/18C08K9/04C08K3/04C08J5/18
CPCC08J5/18C08J2327/18C08K3/04C08K9/04C08K2201/017
Inventor 吴晓明邱剑锷邓赛明
Owner ZHEJIANG DEQING CONCEPTFE PLASTIC PROD
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