PTFE, PFA, FEP, PVDF Fluoroplastic products industry experts
Production and Fabrication of PTFE Film Pressure-sensitive Adhesive Tape
Classification:
Industry dynamics
Author:
PFA tube little sister
Source:
Dankai
Release time:
2022-12-30
Visits:
The chemical stability of PTFE makes it difficult to bond with other materials. The surface energy of Dankai PTFE is very low, and the critical surface tension is only 1.85 × 10-
4N/cm, untreated surface bonding strength is so low that when it is used as a pressure-sensitive adhesive tape substrate, if the surface is not chemically treated, the pressure-sensitive adhesive will not adhere at all.
Up, let alone made into pressure-sensitive adhesive tape. If the fluorine rubber pressure-sensitive adhesive is coated on the polytetrafluoroethylene film to prepare a pressure-sensitive adhesive tape, the performance is very excellent.
However, no fluororubber pressure-sensitive adhesive has been developed so far and can only be replaced by other pressure-sensitive adhesives. At present, the ideal pressure-sensitive adhesive is still silicone pressure-sensitive adhesive.
Making pressure-sensitive adhesive tape, the choice of substrate and surface treatment is very important, a good pressure-sensitive adhesive tape must be the initial adhesive force T However, the surface energy of PTFE is low and the specific surface area is small. It is difficult to meet the above inequality for pressure-sensitive adhesive tape. Corona treatment does not work, and the primer must be degummed. Current The surface is corroded with sodium-naphthalene-tetrahydrofuran solution or sodium-naphthalene-ethylene glycol dimethyl ether solution, and the treated PTFE surface increases its specific surface area, which can be more tolerant. Easy to apply pressure sensitive adhesive. Silicone pressure-sensitive adhesive can be used in a wide temperature range of -73 ℃ ~ +250 ℃, and can bond various difficult-to-stick materials. It has excellent electrical properties and resistance to acid and alkali corrosion. Aging resistance, good adhesion to a variety of adherends. Therefore, the silicone pressure-sensitive adhesive is coated on the PTFE film to make high-quality, high-grade pressure. Sensitive adhesive tape is ideal. Figure 1: PTFE film source: network 1. Substrate access Dankai PTFE film is actually a natural anti-sticking material, so the back side does not need to be anti-sticking treatment, just on the surface of the traditional sodium-naphthalene treatment, in order On the glue. Generally, a polytetrafluoroethylene film with a thickness of 50 μm that has been treated on one side is used. 2. Preparation of pressure-sensitive adhesives The above raw materials are reacted under high temperature and high pressure (steam pressure is above 0.7MPa), and the low molecular weight silicone rubber is removed at the same time. Because the presence of low molecular weight silicone rubber will affect Pressure-sensitive adhesive cohesion and peel strength, in the coating before adding crosslinking agent, fully stirred evenly. 3. Production of pressure-sensitive adhesive tape 3.1. Apply pressure-sensitive adhesive The temperature in the middle of the drying channel of the coating machine is adjusted to above 150 ℃, and the tension of the machine is controlled at the same time, because the tension of the PTFE film is relatively low, and too tight pulling will cause the film. Longitudinal wrinkling, not easy to roll. Control the speed according to the crosslinking degree of the pressure-sensitive adhesive, not only to ensure sufficient crosslinking, but also not to cause appearance defects of the pressure-sensitive adhesive tape (such bubbles, etc.). In particular, it is necessary to control the temperature of the drying channel not higher than 100 ℃, otherwise it is easy to make the coating surface solvent of the pressure-sensitive adhesive quickly volatilize and cure, and the inner layer solvent is not. Can escape from the surface from the inside out, resulting in thermal expansion of bubbles. 3.2. Rewinding and slitting Unsatisfactory semi-finished products need to be rewound on the rewinding machine, on the one hand, the need for finished products (coating machine inevitably has improper control, appearance defects phenomenon), on the other hand also. It is to adjust the number of meters in the roll to prevent the pressure-sensitive adhesive tape from generating large uneven compression force after slitting and causing the film to shrink and run laps. Finished products are cut according to different requirements. This article is originally created by Teflon's little sister. Welcome to pay attention and take you to grow knowledge together!
Key words:
PTFE, pressure sensitive adhesive, adhesive, adhesive tape, surface, film, treatment, conduct, coating
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