1. The principle of protective film adhesive (glue)

Viscoelastic polymer

Film: The adhesive layer can be in close contact with the surface of the adherend and flow into the groove of the adhered surface as much as possible, so that the effective contact area is increased

Tear film: The adhesive layer has higher peel resistance, the higher the peel speed, the higher the peel strength of the pressure-sensitive adhesive

Adhesion performance (stickiness): T<A<C<K

Tack, adhesion, cohesion, keying

2. The main factors affecting stickiness

Wetting: The pressure-sensitive adhesive can only achieve close contact with the surface of the adhered object, creating conditions for physical and chemical combination

Molecule movement and diffusion: pressure-sensitive adhesive molecules will move to the surface of the material to be adhered. When the distance between the two is less than 5A, physical and chemical bonding will occur

Penetration: The adhesive layer flows and penetrates into the groove and the gap under a certain pressure, so that the contact area between the two is increased. At this time, a mechanical bonding force is generated between the adhesive and the material to be adhered.

3. Preparation of substrate film

Blow molding, casting, calendering

4. Surface treatment of substrate film

Corona treatment: form polar reactive groups and form very fine potholes

Coating: The liquid glue is evenly coated on the substrate film and dried initially.