PTFE, PFA, FEP, PVDF Fluoroplastic products industry experts
Polytetrafluoroethylene (PTFE) color film
Classification:
Industry dynamics
Author:
PFA tube little sister
Source:
Dankai
Release time:
2022-12-10
Visits:
The PTFE film is formed by molding a sintered cylindrical blank formed by cutting the film into a film and then calendaring. According to different treatment methods, can be divided
There are three types: oriented film, semi-oriented film and non-oriented film. At present, PTFE film products include porous film, microfiltration film and color film.
PTFE color film is suitable for electrical instruments or wire insulation, different colors. It is a new type of C- class insulation material with excellent comprehensive properties. It's the radio industry,
One of the indispensable materials in the aviation industry and cutting-edge science and technology. The PTFE membrane is usually a suspension polymerized polytetrafluoroethylene resin, and the particle diameter needs to be 150 μm or less.
The pigment must have good heat resistance> 400, fine particles, strong coloring power and stability to chemical reagents.
Its production process:
PTFE resin, pigment → mixing → molding → sintering → cooling → turning to non-oriented film → rolling semi-oriented film
Main process parameters:
Blending: There are two main blending methods used to produce colored PTFE films; dry blending and wet blending. Studies have shown that wet mixing is more uniform than dry mixing, but the process is high and the cost is high.
Solvent is required. In order to ensure the homogeneity of the product, wet mixing is usually used. The process is to add PTFE resin and pigment to solvent → mixing → drying → solvent removal → color material
material.
Molding preforming: Reasonable selection of preforming unit pressure is an important process condition for the production of PTFE color film.
It is mainly selected according to the fineness of the resin, the compression ratio, the fineness of the pigment type, etc., usually 20-40MPa.
Sintering cooling: Because the color film contains pigments, the thermal conductivity and thermal expansion coefficient are not consistent with PTFE. Therefore, the heating and cooling of the sintering process is higher than that of the traditional PTFE membrane.
Slow, the sintering temperature is lower than the ordinary film, heating and cooling 20-30/h, the sintering temperature is 375. Ordinary film heating rate is 50-60/h before 327 and 30-60/h after 327-
40/h, the sintering temperature is 380, the cooling rate is 20-50/H.
Turning to non-oriented film: the sharp angle is 40-45 °, and the speed is slower than that of ordinary PTFE.
Calendered semi-oriented film: The calendering temperature varies depending on the film thickness and is typically 5 microns thick, 110±5; 30 microns thick, 130±10. The rolling multiple is 2.5-3.0.
Figure 1: PTFE membrane Source: Network
Polytetrafluoroethylene (PTFE) porous membrane
PTFE porous membrane is a new type of air filter material. The air filter of this material is suitable for absorbing air or other gases in clean rooms used in the semiconductor industry.
The pressure loss of air and other gases is small.
In 1976, R.W.Gore first disclosed a process for producing a porous PTFE membrane under the trade name Groce-TexR. Mix powdered PTFE and lubricant into paste, squeeze
In the form of a sheet, after discharging the lubricant at a high temperature (lower than the crystalline melting point), uniaxial or biaxial stretching is carried out, and the length after stretching is more than the original.
The nominal pore size of 50 times or more the film length is 0.02 μm to 10 μm, and the thickness is 25 μm to 76 μm. Since 1977, Japanese researchers have published many
For example, Japanese Patent Publication No. 16619/1988. Japanese Patent Publication No. 16019/1988. Japanese Patent Publication No. 17216/1981 carried out a number of tests on porous PTFE membranes.
The porosity is increased, the pore size is decreased and the pressure loss is reduced. Recently, Nippon Yumaru has produced thin films with an average pore size of 0.2 μm to 0.5 μm. Empty
When gas is passed at a flow rate of 5.3 cm/s, the pressure loss is 10mm to 100mm H 2 O. The ratio of porous PTFE membrane is 99:1 to 75:25. area of filament butt joint
The average filament diameter is 0.05 μm to 0.2 μm, and the maximum joint area is not more than 2 μm2.
The preparation method is to use PTFE fine powder (manufactured by Daikin F104) to prepare an unsintered, unstretched PTFE film with a thickness of 100 μm (the film is disclosed in Japanese patent
No.152825/1984). It was then heated in an oven and held under 339 for 50 seconds to obtain a continuous semi-sintered film of 0.50 degree sintering. At 320 ambient temperature
The film is simultaneously or continuously stretched in both directions at a rate of 100%/sec. The film has a stretch ratio of 5-8 in the longitudinal direction of the film and a stretch ratio of 15-8 in the width direction-
25. The total stretching ratio was 75 to 200, and a porous PTFE film and a polytetrafluoroethylene film were obtained.
This article is originally created by Teflon's little sister. Welcome to pay attention and take you to grow knowledge together!
Key words:
PTFE, film, sintering, mixing, porous, stretching, pigment
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