PE coating protective film is divided into low viscosity, medium low viscosity, medium viscosity, medium high viscosity, and high viscosity. Mainly used for ceramic tiles. The floor. Doors and windows, made of aluminum alloy. color steel tile. Acrylic sheet. Stainless steel coil. Waiting for surface protection. Dustproof. antirust. moisture-proof.
Production process. The polyethylene material is blown by a three-layer co extrusion blown film machine. After corona treatment, the broken blade is cut into single-layer film slices and wound up. Then use the coating machine. Dry coating molding.
Substrate: It is a colloidal carrier that serves as the main body for protective film, such as anti scratch, isolation, and anti object protection. Generally, it is made of the following plastic materials: PET, PE, PP, OPP, PVC, PI, PEN, PEEK.
Colloids: Adhesive substrates and substrates, mainly consisting of four types of colloids: a. Acrylic; b.silicon； c.PU； d.Rubber；
Release film: protects the colloid from contamination and dust adhesion. Generally made of PET material, some protective films do not have release films, and a release coating is applied on the surface of the substrate;
Coating: The condition of various protective film coatings is related to the colloidal material and the function of the protective film, and may not be the same.
2. Introduction to the Characteristics of Substrate Materials
PET: Currently widely used in the market, it belongs to polyester film, with a hard material, scratch resistance, easy punching and cutting, good transparency, and temperature resistance of 150c.
PE: The material is soft, easy to stretch, not scratch resistant, and has a temperature resistance of 70c. It is generally co extruded with micro adhesive EVA to form a self-adhesive film. The first level mesh film material for electrostatic protection film is PE, and the cling film and wrapping film used in the food industry are also made of PE material.
PP: scientific name polypropylene, first used in the market as a protective film, but now rarely used. Generally, plastic bags are made of PP material.
OPP: The material is relatively hard, prone to tearing during uniaxial and parallel stretching, and has a certain degree of flame retardancy.
PVC: The material is soft, thick, and has poor transparency. Over time, it will turn yellow and travel. It contains CL and is not currently in use.
PI/PEN/PEEK: Temperature resistant to 260C, used in high-temperature processes, with a higher price.
At present, PET and PE substrates are widely used in the industry.
3. Introduction to the Characteristics of Colloidal Materials
Acrylic: Acrylic adhesive has good light transmittance, water resistance, aging resistance, and poor low-temperature resistance. Its low-temperature performance is poor, and the adhesive will harden in a low-temperature -15C environment. The viscoelasticity of the adhesive is slightly poor at high temperatures or for a long time, and it is easy to peel off powder by hand, difficult to punch and cut, poor exhaust performance, and easy to produce bubbles on the bonding surface. The price is relatively low.
Sillicon: insoluble in water and any solvent, high adsorption performance, fast exhaust speed, good thermal stability, stable chemical properties, high mechanical strength, not easy to fall off powder, resistant to high and low temperatures (-50c-250c), ozone and ultraviolet radiation, viscosity changes with time, temperature changes are small, transparency is slightly low, and it has water absorption. The price is relatively high.
PU: Polyurethane, tough and wear-resistant, UV resistant. Mainly used in the Japanese market.
Rubber: Rubber has a relatively stable viscosity and high tolerance, comparable to different surface viscosities. Currently, it is less commonly used in the market.
At present, Acrylicx and Silicon series are commonly used in the industry.
4. Introduction to Coating Material Characteristics
Release coating: Surface active substances, generally phosphate esters and their derivatives, adhesives or organosilicon compounds.
Continuing coating: Commonly used continuing coatings include chlorinated polypropylene, cellulose derivatives, cyclic chloride resins, polyamide resins, water-soluble melamine resins, and organic peptide compounds.
For non-polar substrates such as PE and PP, chemical treatment, corona treatment, ozone exposure, UV irradiation, flame treatment, and plasma treatment can be used to polarize their surfaces and increase adhesion. In industry, corona discharge is generally used.
Silicone protective films generally use a continuous coating to increase base adhesion and a non release coating. Acrylic adhesive protective film substrate adopts corona treatment, and the release coating is generally silicone oil.
