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A kind of preparation method of modified polytetrafluoroethylene powder

A polytetrafluoroethylene powder technology, which is applied in the field of preparation of modified polytetrafluoroethylene powder, can solve the problems of weak interfacial bonding force between filler and PTFE, fibrosis of dispersed PTFE resin, unsatisfactory improvement of mechanical properties, etc. Demulsification, good mechanical properties, good product performance

Active Publication Date: 2020-12-29
JUHUA GROUP TECH CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the above methods can improve the dispersion of fillers in PTFE, due to the particularity of PTFE resin, the interfacial bonding force between fillers and PTFE is still weak
At the same time, the above methods are all carried out by physical mixing, the mixing effect is average, and the improvement of mechanical properties is not ideal, and this method is not suitable for dispersing PTFE resin, and physical mixing is easy to cause fiberization of dispersed PTFE resin

Method used

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  • A kind of preparation method of modified polytetrafluoroethylene powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Carrying out polydopamine coating modification to filler alumina powder to obtain polydopamine modified alumina powder;

[0024] (2) Add the polydopamine-modified alumina powder in step (1) into deionized water, then add viscous biological substance dihydroxyphenylpropionic acid, adjust the pH value to 5 with hydrochloric acid under stirring, and continue stirring for 10 minutes to obtain ions An aqueous dispersion of polydopamine-modified alumina;

[0025] (3) filtering and drying the aqueous dispersion of ionized polydopamine-modified alumina prepared in step (2) to obtain ionized polydopamine-modified alumina powder, and the mother liquor obtained by filtering can be recycled;

[0026] (4) Add the ionized polydopamine-modified alumina powder obtained in step (3) into the PTFE emulsion, and stir at 100 rpm for 40 minutes to break the emulsion;

[0027] (5) Filtrating and drying the broken emulsion in step (4) to obtain a modified polytetrafluoroethylene powder pr...

Embodiment 2

[0029] (1) Carrying out polydopamine coating modification to filler silica powder to obtain polydopamine modified silica powder;

[0030] (2) Add the polydopamine-modified silica powder in step (1) to deionized water, then add viscous biological substance dihydroxyphenylalanine, adjust the pH value to 4 with sulfuric acid after stirring, and continue stirring for 15 The aqueous dispersion of ionized polydopamine-modified silicon dioxide is obtained in minutes;

[0031] (3) filtering and drying the aqueous dispersion of ionized polydopamine-modified silica prepared in step (2) to obtain ionized polydopamine-modified silica powder, and the mother liquor obtained by filtering can be recycled;

[0032] (4) Add the ionized polydopamine-modified silica powder obtained in step (3) into the PTFE emulsion, and stir at 400 rpm for 30 minutes to break the emulsion;

[0033] (5) Filtrating and drying the broken emulsion in step (4) to obtain a modified polytetrafluoroethylene powder prod...

Embodiment 3

[0035] (1) Carry out polydopamine coating modification to filler carbon fiber powder, obtain polydopamine modified carbon fiber powder;

[0036] (2) Add the polydopamine-modified carbon fiber powder in step (1) into deionized water, then add viscous biological substance nitrodopamine, adjust the pH value to 3 with nitric acid under stirring, and continue stirring for 20 minutes to obtain ionized polydopamine Aqueous dispersion of modified carbon fiber;

[0037] (3) filtering and drying the aqueous dispersion of ionized polydopamine modified carbon fiber prepared in step (2) to obtain ionized polydopamine modified carbon fiber powder, and the mother liquor obtained by filtering can be recycled;

[0038] (4) Add the ionized polydopamine modified carbon fiber powder obtained in step (3) into the PTFE emulsion, and stir at 600rpm for 25 minutes to break the emulsion;

[0039] (5) Filtrating and drying the broken emulsion in step (4) to obtain a modified polytetrafluoroethylene po...

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Abstract

The invention discloses a preparation method of a modified polytetrafluoroethylene powder. The preparation method comprises the steps: (1) carrying out coating modification on a hard packing powder byusing polydopamine to obtain a polydopamine-modified hard packing powder; (2) adding the polydopamine-modified hard packing powder into deionized water, and then, adding a viscous biological substance to obtain an aqueous dispersion solution of ionized polydopamine-modified hard packing; (3) filtering and drying the aqueous dispersion solution of the ionized polydopamine-modified hard packing toobtain an ionized polydopamine-modified hard packing powder; (4) adding the ionized polydopamine-modified hard packing into a polytetrafluoroethylene emulsion to obtain a demulsification solution; and(5) filtering and drying the demulsification solution to obtain the modified polytetrafluoroethylene powder. The preparation method has the advantages of simple process and good product performances.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a preparation method of modified polytetrafluoroethylene powder. Background technique [0002] Polytetrafluoroethylene (PTFE) is a special engineering plastic with excellent self-lubricating properties, chemical stability, good heat resistance and low friction coefficient, but its shortcomings such as low hardness and poor wear resistance limit its application. At present, the hardness and friction and wear properties of PTFE are usually improved by adding hard fillers. However, due to the poor interfacial compatibility between PTFE and other materials, it is difficult for fillers to disperse uniformly in PTFE, resulting in a sharp decline in the mechanical properties of PTFE, which in turn affects the use of PTFE. [0003] For example, in patent CN102604282A, a coupling agent is used to modify the surface of nanoparticles, and the modified nanoparticles are physica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/18C08K9/10C08K9/04C08K3/22C08K3/36C08K7/06
Inventor 孙洪阳汪星平张广欣郑侠俊贾冰
Owner JUHUA GROUP TECH CENT
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