Basic knowledge of PU protective film

Basic information

polyurethane (English name) : PU polyurethane, Chinese name: polyurethane; In Chinese, polyurethanes, also known as polycarbamates, are macromolecular compounds containing a duplicate carbamate group (NHCOO) in their main chain. It is composed of organic diisocyanate or polyisocyanate and dihydroxyl or polyhydroxyl compounds.

In addition to carbamate, polyurethane macromolecules can also contain ether, ester, urea, biuret, urea formate and other groups.

Polyurethane (PU for short) is a polymer made from polyisocyanate and polyether polyols or polyester polyols or/and small molecule polyols, polyamines or water and other chain extenders or crosslinking agents.

Physicochemical properties

CAS No. : 51852-81-4

Subformula: The general formula can be -[-O-conh -]n- a polymer compound formed by the action of binary or multiple isocyanate with binary or multiple hydroxyl compounds, binary amines, etc.

Poly (carbamate) is a polymer compound with a molecular structure containing NHCOO – unit, which is formed by the reaction of isocyanate group and hydroxyl group. The reaction formula is as follows: -n =C=O+HO-→ -Nh -COO-

Product summary

A high temperature protective film with environmentally friendly PET as the base material, coated with PU adhesive, so that it has low adhesion, and can be bonded for a long time, and will not appear degumming phenomenon after removal.

Features: high light transmittance, high weather resistance, low adhesion and easy to tear, no glue residue, high temperature resistance

Features: high cleanliness, strict foreign body control; Excellent adhesion properties for the pasted objects; There is no residual glue after pasting, and the product transparency is 90%. Optical grade PET material, good transmittance.

PET is a composite optical protective film based on polyurethane adhesive. Its reuse and good air tightness, can be used for various optical parts protection. Compared with the previous protective film, the pollution is low, especially suitable for the touch screen ITO glass processing, the performance is better than the ordinary silicone protective film, can solve the ordinary silicone protective film white fog and local degummy problems.

Application and function of PU protective film

Anti-static PU protective film, is to die cutting processing, laminating with antistatic function, which can prevent and avoid die cutting processing and environmental dirt; The rubber surface anti-static PU protective film is to avoid the electrostatic generated by friction when the protective film is torn, resulting in short circuit on the sensor surface. Chen said, “Kaismau protective film started from Apple’s IPAD products, and now high-end customers have adopted Kaismau PU protective film Xinli, Foxconn, TPK and many other well-known enterprises.”

Kaisimao PU protective film is also the world’s most complete and most manufacturers, according to the different functions of rubber surface anti-static, film surface anti-static, rubber film double-sided anti-static, non-anti-static and other functions of PU protective film; According to different PU adhesive strength, there are 1 g, 3 g, 5 g, 8 g, 10 g series PU protective film; According to the different thickness of PET substrate, there are 0.05mm, 0.075mm, 0.1mm PU protective film; According to different release film, there are 5 g, 8 g, 10 g equal release rate PU protective film; According to different temperature resistance, there are 90 degrees, 150 degrees, 230 degrees and other PU protective films. There are more than 20 types of PU protective films publicly sold by Kaisimao in the market and PU protective films exclusively for projects.

Common faults of PU protective films

In the process of die cutting, improper treatment, usually cause fog, residual glue, bubble printing, dust, dirt and other phenomena, so the protective film treatment technology is particularly important. The reason for these problems is that the precision of die cutting equipment is not enough and the process is improper. In the chemical molecular structure of PU glue, the molecules are tightly held, and other chemical molecules are excluded, so it is easy to be lost by gravity of foreign objects. The solution is to improve the die cutting process and equipment, cover PE film and mesh film to avoid dust.

The good and bad quality of protective film products, in addition to the research and development of technical strength, production equipment, production experience and other differences in the reasons, as well as the choice of raw materials. Material selection directly affects the quality of PU protective film.