PTFE, PFA, FEP, PVDF Fluoroplastic products industry experts
PTFE Film Introduction
Classification:
Industry dynamics
Author:
PFA tube little sister
Source:
Dankai
Release time:
2022-12-01
Visits:
PTFE film is made of molded sintered cylindrical blanks, which are cut into films by machine tools and then calendered. According to the different treatment methods can be divided into oriented film, semi-oriented film and non-oriented film three, the current
PTFE film products are porous membrane, microfiltration membrane, color membrane, etc.
1. PTFE color film
PTFE color film is suitable for electrical instruments or wire insulation marked by color and luster. It is a new type of C- class insulation material with excellent comprehensive performance. It is a kind of radio industry, aviation industry and cutting-edge
One of the indispensable important materials in science and technology. Polytetrafluoroethylene film generally adopts suspension polymerization polytetrafluoroethylene resin, and the particle diameter is required to be less than 150μm. Pigments must have heat resistance
Good (>400 ℃), fine particles, strong coloring power, stable chemical reagents and other requirements.
Figure 1: PTFE film source Dankai
Its production process:
PTFE resin, pigment → mixing → compression molding → sintering → cooling → turning unoriented film → calendering semi-oriented film.
Main process parameters:
Mixing: At present, there are two main mixing methods for producing color PTFE film: dry mixing and wet mixing. The research shows that wet mixing is more uniform than dry mixing, but the process is more, the cost is high, and the solvent needs to be added,
In order to ensure the uniformity of the product, wet mixing is generally used.
The process is the PTFE resin, pigment and solvent → mixing → drying → solvent removal → material.
Molding preforming: reasonable selection of preforming unit pressure is an important process condition for the production of PTFE color film. Mainly according to the fineness of the resin, compression ratio, pigment type fineness and other conditions to choose, a.
Generally at 20 ~ 40MPa
Sintering cooling: Because the color film contains pigments, the thermal conductivity and thermal expansion coefficient are inconsistent with PTFE. Therefore, the temperature rise and fall in the sintering process is slower than that of ordinary PTFE film, and the sintering temperature is thinner than that of ordinary PTFE film.
The film is low, the temperature is 20~30 degrees C/h, the sintering temperature is 375 degrees C. The ordinary film heating rate at 327 ℃ before 50~60 ℃/h, at 327 ℃ after 30~40 ℃/h, sintering temperature
380 ℃, cooling rate 20~50 ℃/h.
Figure 2: PTFE film Source: Dankai
Turning unoriented film: the tip angle of the knife should be 40 ° ~ 45 °, and the speed is slower than that of ordinary PTFE.
Calendered semi-oriented film: the calendering temperature varies with the thickness of the film, generally 5μm thick, 110 ℃ ± 5 ℃;30μm thick, 130 ℃ ± 10 ℃. Calendering multiple is 2.5~3.0.
Main equipment:
(1) Mixer;
(2) Hydraulic press: 35 ~ 40MPa;
(3) Sintering furnace: DL151;
(4) Precision CNC lathe: C620;
(5) Calender: roller Φ100 × 120.
Figure 3: PTFE film Source: Dankai
2. Polytetrafluoroethylene porous membrane
The porous PTFE membrane is a new type of air filter material. Air filters using this material are suitable for absorbing suspended particles in air or other gases in clean rooms used in the semiconductor industry and air and other gases.
Body pressure loss is small.
In 1976, R.W.Gore first disclosed a process for producing a porous PTFE membrane of the trade name Groce-TexR. Mix the powdered PTFE and lubricant into a paste, extrude it into a sheet, and then discharge it.
After the temperature of the lubricant is raised (below the crystalline melting point), uniaxial or biaxial stretching is carried out, and the length after stretching is more than 50 times the original length. The nominal pore size of the membrane is 0.02μm ~ 10μm, and the thickness is 25μm ~ 10μm ~
76μm 。
Since 1977, Japanese researchers have published many patents, such as Japanese Patent Laid-Open Publication 16619/1988. Japanese Patent Publication 16019/1988. Japanese Patent Publication 17216/1981 on Porous
PTFE membrane, increase the porosity, reduce the pore size, reduce the pressure loss and so on. Recently, a membrane with an average pore size of 0.2μm ~ 0.5μm has been produced by Japan Honda Marubeni. When the air is
When the flow rate of 5.3 cm/s passes through the pressure loss of 10mm ~ 100mmH2O column, the porous PTFE film has an area ratio of fibrils to contacts of 99 :1 to 75 :25, and an average of 0.05μm ~ 0.2μm.
Filament diameter and maximum junction area of not more than 2 μm2.
It is prepared by preparing an unsintered, unstretched PTFE film having a thickness of 100 μm from PTFE fine powder (from DaikinF104) (the film is disclosed in Japanese Patent Laid-Open No. 152825/1984). and then
This was heated in a furnace and maintained at 339 ° C. for 50 seconds to obtain a continuous semi-sintered film with a 0.50 degree of sintering. Heating was continued for 15 minutes at ambient temperature of 320°C. Simultaneous or continuous in both directions at a rate of 100 %/sec
to extend the film. The apparatus is manufactured by Iwamoto Corporation and has a draw ratio of 5 to 8 in the longitudinal direction and 15 to 25 in the width direction of the film. The total stretching ratio is 75~200, and the PTFE porous film is prepared.
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, ptfe, mixing, sintering, porous, temperature, orientation, good heat resistance
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