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Modified plastic surfaces with perfluoropolymers and method for producing same

A perfluoropolymer, polymer technology, applied in the direction of coating, etc., can solve the problems of excessive wear of sliding friction properties, insufficient assembly properties, etc., and achieve the effect of improving friction properties, improving sliding friction properties, and low wear

Active Publication Date: 2020-04-10
LEIBNIZ INST FUR POLYMERFORSCHUNG DRESDEN EV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0029] The known solutions of the prior art have the disadvantage that the fitting properties and / or Sliding friction properties and excessive wear

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0179] Similar to Comparative Example 1, a 50 mm x 50 mm and 2 mm thick dry TPU board was placed on a 60 mm x 60 mm steel plate and covered with a thin layer of PTFE-1 (reactivated PTFE powder Zonyl MP 1100 with -COCl groups). Place a 60mm x 60mm steel plate on it. On this steel plate was placed a vulcanized NBR plate of 50 mm x 50 mm and 2 mm thick, on which again a steel plate of 60 mm x 60 mm was placed. This stack of plates was put into a press with a punching diameter of 120 mm and loaded with 100 kN at room temperature. A vibrator is now located at the middle plate, by means of which this plate is excited to vibrate. After 10 minutes the stress is relieved and the stack is removed. The TPU plate covered with PTFE-1 powder was taken out and cleaned thoroughly with ethanol while brushing lightly with a brush. After the boards were dried, the treated surface was visually different from the untreated boards. The treated surface feels very smooth, and in contrast to the u...

Embodiment 2

[0182]A pre-dried TPE-A / PEBA plate (Vestamid, Evonik) of 50 mm x 50 mm and 2 mm thick was placed on and covered with a 100 mm x 100 mm steel plate with a 20 mm diameter circular hole in the middle as a window , so that the PEBA is only visible in the void. The 2 steel plates were screwed together with the PEBA sample and dried again in vacuo at 80°C and fixed on a heating table under the same dry PET foil and raised to 80°C. Now add PFA-1 powder (reactivated PFA powder, with -COCl groups) to the PEBA visible / accessible in the window and rub with a stiff brush in a circular motion on the PEBA surface. After 5 minutes the experiment was stopped and the PEBA plate was removed. The PEBA panels topically covered with PTFE powder were aspirated and cleaned thoroughly with ethanol while brushing lightly. After drying the board, the partially treated surface was visually different from the untreated part. The treated surface felt very smooth and water dripped from the surface treat...

Embodiment 3

[0186] A 50mm x 50mm and 2mm thick pre-dried PA6 plate is placed on a 100mm x 100mm steel plate and covered and screwed with a 100mm x 100mm steel plate with a circular hole in the middle with a diameter of 20mm as a window so that the PA6 is only in the blank visible in the section. The 2 steel panels with PA6 samples were dried again in vacuo at 80° C. and fixed on the table under the same dry PET foil. After removal of the foil, PTFE-2 micropowder (activated PTFE powder Algoflon L 620 with grafted acryloyl chloride) and ceramic balls with a diameter of 0.3 mm are now added to the PA6 visible / accessible in the window. By means of a plastic stamping head (PET), the ceramic balls, together with PTFE, are moved over the surface in a rolling manner under pressure and a circular motion at room temperature, so that PA6 is treated with PTFE-2 micropowder on accessible surfaces. After about 5 minutes the experiment was stopped, the ceramic balls were removed, and excess PTFE was as...

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Abstract

The invention concerns the field of chemistry and relates to modified plastic surfaces with perfluoropolymers, which have improved assembly properties for use under tribological conditions and can beused in particular in mechanical engineering. The aim of the invention consists in providing modified plastic surfaces with perfluoropolymers, whereby plastic surfaces which are provided for use undertribological conditions have substantially improved assembly properties and / or sliding friction properties and exhibit a very low degree of wear. This is achieved by modified plastic surfaces with perfluoropolymers, wherein after a reactive conversion under mechanical stress at room temperature at least the reactive -NH groups and / or -OH groups present on the surface of plastics are provided in acovalently bonded manner to the perfluoropolymer carboxylic acid halide provided at least in the modified perfluoropolymer (micro) powder region near the surface and / or to the grafted (meth) acrylicacid halide and / or (meth) acrylic acid that is provided via perfluoropolymer (peroxy) radicals of the perfluoropolymer (micro) powder and is modified into (meth) acrylic acid halide prior to the reactive conversion.

Description

technical field [0001] The present invention relates to the field of chemistry and to modified plastic surfaces with perfluoropolymers, which have improved fitting properties (Montageeigenschaften) and / or sliding friction properties and reduced wear for use under frictional conditions, and in particular It can be used in general machine construction and in the special field of sealing technology / dynamic sealing systems as well as in motor vehicle technology, and also relates to methods for producing such modifications. Background technique [0002] People refer to materials mainly composed of polymer compounds as plastics (Wikipedia, keyword plastic). [0003] A polymer is a chemical substance consisting of high molecular weight compounds (Wikipedia, keyword polymer). [0004] Perfluoroalkyl polymers (e.g. PTFE and / or PFA) are known to decompose radiochemically under the action of high-energy / energy-rich radiation (e.g. electron beam and / or gamma radiation) [K. Lunkwitz et ...

Claims

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Application Information

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IPC IPC(8): C08J7/12C08J7/046
CPCC08J7/12C08J7/126C08J2375/04C08J2377/00C08J2427/18C08J7/0427C08J7/046C08J3/12C09D5/031
Inventor D·莱曼
Owner LEIBNIZ INST FUR POLYMERFORSCHUNG DRESDEN EV
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