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What is the reason for the residual glue of the PE protective film?

2020-10-29 15:06:21
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1. Human factors: Some people think that PE protective film looks like a layer of plastic film. Any kind of optical protective film can meet their product needs, or even just think it can be attached. It is very irresponsible. According to the statement, there is still a lot of professional knowledge about PE protective film, such as: keep the product clean, no grease and no chemical residue on the surface of the product before applying the film, otherwise it will easily cause the residue to react with the glue and cause degumming , The phenomenon of insufficient viscosity, etc...


2. The internal factors of the glue are divided into the following three points: ①The adhesion of the base is damaged, there are more rubber residues on the surface of the protected product, and the substrate is visible on the surface of the PE protective film; ②The cohesive damage, on the surface of the protected product and the substrate There are pressure-sensitive adhesives, and the coating surface of the protective film loses its luster; ③Migration residue, there is a small amount of pressure-sensitive adhesive residue on the surface of the protected product, and the gloss of the coated surface of the PE protective film remains good.


3. Aging mechanism


The main chain of acrylic pressure-sensitive adhesive is a saturated chain, and it is difficult for the main chain to be broken by general heat energy. The main aging mechanism is ultraviolet light aging; the substrate aging is also mainly ultraviolet light aging. For example, the tensile strength of the PE film substrate after aging for 1 week in an environment of 80°C and 30W ultraviolet light from a uv lamp supplier, the results show that the normal operating temperature has little effect on its aging performance, while the ultraviolet The impact is greater. But under the dual effects of heat and ultraviolet light, there is a synergistic aging effect.


4. Similar compatibility mechanism


Acrylic pressure-sensitive adhesives are relatively polar materials. They are simply compatible with polar materials such as acrylates, polyesters, and polyurethanes, making it difficult to remove the pe protective film. Sometimes the small molecules that are not cross-linked by the pressure-sensitive adhesive will be enriched on the outer surface. If the effect between the protected surface data and these small molecules is greater, there will be a phenomenon of small molecules relocating and remaining.


5. The peel strength changes over time


No matter how high the surface gloss is, the surface of the object is scattered with many tiny holes that are difficult to see with the naked eye. Although the pressure-sensitive adhesive is cross-linked, it still has a certain degree of deformation and fluidity, especially the part of the polymer that has not participated in the cross-linking.


With the extension of time, the pressure-sensitive adhesive gradually penetrates into the gap to form an "anchor". In addition, when attaching the pe protective film, although the pressure is high, the contact area between the pressure-sensitive adhesive and the surface of the data is not very large. With the extension of time, the contact area gradually increases, and the effect between the pe protective film and the protected surface Strength has also gradually improved. Both effects will increase the peel strength with time.