Two-component high-gloss PU paint removal solution for PCTG material spectacle frames

PCTG plastic is a transparent plastic, which has good impact resistance and resistance to various chemical solvents. In terms of molding technology, injection molding and extrusion are mainly used. At the same time, its excellent transparency, gloss and toughness are widely used. Substrates for perfume bottles, cosmetic bottles and caps, eyeliner sets, glasses frames, etc. In terms of surface treatment, the painting process is common, but some parts are prone to paint falling off, which has a great impact on the yield and quality of spraying. Let’s take the PCTG spectacle frame sprayed with two-component high-gloss PU as an example to see how to solve the problem of PCTG plastic spray paint peeling off?

PCTG material spectacle frame spray paint peeling solution

High-gloss PU (glasses varnish) sprayed on the surface of PCTG spectacle frames has the construction characteristics of good leveling performance, high surface gloss, good fullness, high hardness, and anti-pollution and chemical resistance. Good decorative and protective effects are obtained in appearance and durability in the use environment. However, in the actual spraying process, when the PCTG material spectacle frame is sprayed with PU varnish for glasses, it is difficult for the paint to form a coating with good adhesion and bonding force with the PCTG substrate. The phenomenon of peeling paint.

Judging from the bad phenomenon of high-gloss PU paint sprayed by PCTG, the fundamental point to solve the problem of paint falling off is to improve the adhesion, and part of it can be solved by adjusting the paint. If there is no solution at the paint level, then choose a primer to pass the primer The method of construction, the way of linking the paint to the substrate is a very wise choice. The principle of TR90 treatment agent is that the acrylic copolymer has a linear molecular structure, and one end of the linear molecule can enter the inner layer of TR plastic to react with resin molecules to form molecular bonds, and at the same time form a layer of protective coating. The other end of the linear molecule is linked with the hydroxyl groups in the topcoat to improve the adhesion of the topcoat.

Usually in the spectacle frame spraying industry, TR90 treatment agent is widely used to solve the problem of PU paint peeling off of TR90, TR+rubber, TR+TPE, CA, CP, PETG, PCTG, nozzle material and other substrates. , It has universal applicability in enhancing the effect of adhesion or versatility. In terms of adhesion test, it has passed tests such as 100-grid, freezing, bending, and knife-cutting.