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Meltability polytetrafluorethylene tubular film and method for preparing same

A polytetrafluoroethylene, tubular membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of high technical difficulty, high cost, and high equipment requirements, and achieve low equipment investment and low cost. , The effect of stable product quality

Inactive Publication Date: 2008-09-03
陈贤斌
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Another technical problem to be solved by the present invention is to provide a method for manufacturing the above-mentioned fusible polytetrafluoroethylene tubular film, so as to overcome the shortcomings of the prior art, such as high technical difficulty, high equipment requirements and high cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 500 grams of solid content is 50wt% meltable polytetrafluoroethylene (PFA) emulsion, adding 100 grams of concentration is 25wt% sodium chloride (NaCl) aqueous solution, 50 grams of solid content is 45wt% aqueous polyacrylic acid emulsion, mixed to prepare To form the bottom coating, insert a ￠18×330mm bright mirror aluminum alloy tube into the fixed rod of the electrostatic spraying machine, the rotation speed is 30rpm, the electrostatic voltage is 8KV, the distance between the center of the spray plate and the workpiece is 20-50cm, and the thickness of the bottom coating is controlled by measuring method , and dry naturally.

[0029] Adding 150 grams of solid content to 50wt% PFA emulsion in 500 grams of solid content is 50wt% polyperfluoroethylene acrylic acid emulsion, and 50 grams of solid content is 45wt% water-based polyacrylic acid emulsion. Under the process conditions, use an electrostatic sprayer to coat the surface of the above-mentioned naturally-dried prime...

Embodiment 2

[0033] 500 gram solid content is that 50wt% PFA emulsion adds 115 gram concentrations and is the potassium chloride (KCl) aqueous solution of 20wt%, and 25 gram polyethylene glycols (PEG) are mixed and made primer, adopt and embodiment 1 identical production process is coated Cover and dry at 100°C.

[0034] 500 grams of solid content is 50wt% PFA emulsion and 180 grams of solid content is 50wt% polyperfluoroethylene acrylate emulsion, 25 grams of polyethylene glycol 1000 (PEG) are mixed to make top coat, adopting the same production process as in Example 1 Coated and dried at 100°C.

[0035] The baking and plasticizing process of the bottom layer and the surface layer is the same as in Example 1. After the film is removed, a PFA tubular film with a bottom layer thickness of 20 um, a surface layer thickness of 30 um, and a total thickness of 50 um is obtained. The PFA tubular membrane is treated with water by an ultrasonic cleaning machine to obtain the finished membrane.

Embodiment 3

[0037] 500 gram solid content is that 30wt% PFA emulsion adds 55 gram concentrations and is 40wt% potassium chloride (KCl) water-soluble, 22.5 gram polyvinylpyrrolidone (PVP) mixes and makes primer, adopts the production process identical with embodiment 1 to be coated with Cover and dry at 100°C.

[0038] 500 gram solid content is that 30wt% PFA emulsion adds 150 gram solid content and is 50wt% tetrafluoroethylene-ethylene copolymer (ETFE) emulsion, 7.5 gram polyvinylpyrrolidone (PVP) are mixed and made top coat, adopt and embodiment 1 identical The production process is coated and dried at 100°C.

[0039] The baking and plasticizing process of the bottom layer and the surface layer is the same as in Example 1. After the film is removed, a PFA tubular film with a bottom layer thickness of 10 um, a surface layer thickness of 30 um, and a total thickness of 40 um is obtained. The PFA tubular membrane is treated with water by an ultrasonic cleaning machine to obtain the finishe...

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Abstract

The invention discloses a fusible polytetrafluoroethylene tubular film and the manufacturing method thereof. The tubular film is a seamless tubular piece consisting of a bottom layer and a surface layer, wherein the two layers are made mainly from fusible polytetrafluoroethylene, the bottom layer has a coating containing water-soluble inorganic salts that are dissolved out under ultrasonic water washing to form the micropores, and the surface layer is smooth and compact and has anti-sticking effect. The production method includes the following steps: coating the bottom and the surface layers respectively on the surface of an aluminum alloy tube, baking at a high temperature to form film, removing from the surface of the aluminum alloy tube, subjecting to ultrasonic washing to obtain the PFA tubular film with porous inner surface and smooth and compact outer surface. The outer surface of the product is smooth and compact and excellent in anti-fouling function. The inner surface of the product doesn't need subsequent treatment and has good effect of adhersion with silicone rubber after coating. The fusible polytetrafluoroethylene tubular film is particularly suitable for the production of silicone rubber hot rollers used in duplicators and laser printers.

Description

technical field [0001] The invention relates to a silicone rubber-coated PFA tubular film mainly used in the fixing member of laser printers and digital copiers for pressure adjustment rollers (ie lower hot rollers) and a manufacturing method thereof. Background technique [0002] Fusible polytetrafluoroethylene (PFA) has the same high temperature resistance and low surface properties as polytetrafluoroethylene (PTFE), and shows excellent non-stick properties, and has better high temperature strength and film transparency than polytetrafluoroethylene. In recent years, with the development of fixing device technology in copiers and laser printers, higher requirements have been put forward for printing quality and clarity. The silicone rubber lower hot rod coated with PFA film has become the mainstream, while the lower hot rod without PFA coating Sticks are eliminated. [0003] Meltable polytetrafluoroethylene PFA tubular film is usually blown or extruded at home and abroad, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/36B01D69/04B01D69/12
Inventor 陈贤斌
Owner 陈贤斌
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