There are four types of pressure sensitive adhesives for protective films: natural rubber, synthetic rubber, water-soluble acrylic acid, and solvent-based acrylic acid. The key to the quality of the protective film is determined by the characteristics of the rubber. "Although the formulation of the domestic protective film glue is improved every year, the real development history is only a dozen years, unlike the foreign countries have four or fifty years. The history of the protective film for aluminum-plastic composite panels is generally solvent-based acrylic. The imported protective film four pressure-sensitive adhesives have been widely used. They have different characteristics.
1. Natural rubber has a high cohesion, so it generally does not
Residue is produced. Viscosity is regulated by resins and additives. However, the coating process is complicated, and it is necessary to apply a primer to the film to improve the surface energy of the film before the natural rubber is coated on the PE film. Due to the immature research of such domestic processes, rubber is rarely used for coating. In an indoor environment, natural rubber can remain unchanged for 2 years, but under ultraviolet light! It will degrade in 3-12 months. The protective film of POLI-FILM generally has 3 layers: the innermost layer: black, It can effectively absorb ultraviolet rays; the middle layer: white, can reflect light, so that the protective film can absorb less energy and reduce the aging of the colloid. The surface layer: white: can completely cover the black of the inner layer, and the pure white color can make the printing more beautiful. . Therefore, even if it is exposed to outdoor heat for 12 months, the rubber will not age. "Remove the worries of the manufacturer. The typical natural rubber has a light yellow color. The initial viscosity of the natural rubber is very good, and the glue and the glue are difficult to unravel when they are in contact.
2. Synthetic rubber provides higher viscosity and weatherability, but
After a long time, the glue will solidify and the initial viscosity will decrease. Therefore, natural rubber is generally added to the synthetic rubber.
3. Water-soluble acrylic acid is water to dissolve propylene
Acid monomer. Because it is environmentally friendly, it does not require a solvent recovery device. Water-soluble colloids are often used in developing countries to produce protective films. Water-soluble acrylic acid basically has the characteristics of a solvent-based protective film. The rubber surface of the water-soluble protective film should avoid and reduce the contact with water vapor to avoid residual glue. The water-soluble rubber protective film is characterized in that the tear film is very easy and fast. Water-soluble acrylic protective films are used in the United States and Asia.
4. Solvent-based acrylic acid is dissolved by using an organic solvent as a medium.
Solvent acrylic monomer.
Acrylic gel is very transparent! It is very resistant to aging! It can last up to 10 years. When exposed to UV light, the glue will slowly solidify. Acrylic adhesives have a lower initial tack than rubber. After the film is corona treated, the acrylic adhesive can be directly coated without a primer. The acrylic protective film emits a jittery, harsh sound when unwrapped, and the rubber type protective film is light when unwound. Compared with acrylic glue! Rubber is very soft and fluid. After the pressure! It is quickly in contact with the surface to be attached, so the biggest advantage of the rubber type protective film is that the viscosity is exerted quickly! The final viscosity is quickly reached after passing through the pressure roller. It is suitable for cutting in the board factory, and it is very convenient for the end user to tear the film. For the rough surface, after the pressure, the rubber molecules have better liquidity, and can be quickly pressed into various depressions and fully contacted with the surface.
The acrylic rubber is very hard! The fluidity is poor, so the adhesion of the acrylic protective film is relatively slow. Even after the pressure, the colloid and the surface to be attached are not fully contacted, and the surface is fully contacted after being left for 30-60 days. The final tack is achieved and the final tack tends to be 2-3 times greater than the tack when applied. If the viscosity of the acrylic protective film is suitable for the cutting of the board factory, the end user may be laborious or even tear when tearing the film. Therefore, imported protective film is generally recommended for rubber type protection in the aluminum-plastic composite panel industry.
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