Strippable double-sided sticky tape for large-size sapphire glass grinding and preparation method of strippable double-sided sticky tape

Abstract

The invention relates to a strippable double-sized sticky tape for large-size sapphire glass grinding. The strippable double-sized sticky tape comprises a first release layer, a first adhesive layer, a second adhesive layer and a second release layer which are composited sequentially, wherein the first adhesive layer comprises components in parts by weight as follows: 100 parts of a reworkable acrylate adhesive body and 1-4 parts of a first cross-linking agent; the second adhesive layer comprises components in parts by weight as follows: 100 parts of an acrylate adhesive body with UV activity, 10-30 parts of a light-sensitive compound, 2-8 parts of a photoinitiator, 2-8 parts of a second cross-linking agent and 10-30 parts of a solvent. Compared with the prior art, the adhesive tape is convenient to use and can effectively improve the grinding efficiency of sapphire glass, and the grinding thickness of the obtained sapphire glass has better uniformity. The invention further relates to a preparation method of the double-sided sticky tape. According to the preparation method, steps are simple, materials are cheap and easy to obtain, and industrial production is facilitated.

Description

technical field [0001] The invention relates to the technical field of peelable tapes, in particular to a peelable double-sided tape for large-size sapphire glass grinding and a preparation method thereof. Background technique [0002] In recent years, due to its high hardness and wear resistance, sapphire has been widely used in display components such as barcode scanning at cash registers, large-sized smartphones, and tablet computers, and the supply is in short supply. The processing of large-sized sapphire usually needs to go through multiple processes such as rough grinding, fine grinding and polishing. The processing process requires the use of large grinding discs and ceramic discs carrying sapphire glass. And it needs high-pressure and high-speed grinding in the alkaline liquid with pH=10~11, so that the sapphire sheet and the grinding pad rotate counterclockwise at high speed. Since the finished sapphire has high requirements on uniformity and optical transmittance...

AI Technical Summary

Problems solved by technology

In the prior art, the following methods can be used to fix the sapphire glass when grinding sapphire glass. One is to use printing ink, but this method is cumbersome, and after the grinding is completed, it needs to be treated with ultrasonic heating water, which will easily lead to the grinding of the sapphire glass. The problem of poor whitening occurs; the other is to use thermal peeling tape for fixed grinding, but the thickness of the thermal peeling tape is usually thick, which makes it difficult to meet the requirements for the uniformity of the sapphire thickness after processing. After the ceramic plate is finished, it takes a long time to cool down before it can be used again, which seriously affects the processing efficiency; while using UV adhesives, it is difficult to apply the glue evenly, and it is easy to cause uneven thickness of the sapphire after processing; if ordinary double-sided tape is used, the processing The rear sapphire is more difficult to take out, and it is easy to cause the sapphire to break

[0004] The Chinese invention patent application with application publication number CN103923572A "A UV peelable adhesive and its preparation method" (application number: CN201410180484.2), the Chinese invention patent application with application publication number CN103421400A "A touch screen UV curing peelable glue Adhesive and its preparation method" (Application No.: CN201310388295.X) etc. have also disclosed about the scheme of UV curing stripping tape, but it can only be used for small-sized silicon wafers, and cannot meet the relevant requirements and processing of large-sized sapphire glass processing. condition

On the one hand, most of the current UV curing and peeling tapes are single-sided UV curing and peeling tapes, which cannot be applied to this field; on the other hand, if the UV curing and peeling tapes are made into double-sided tapes without substrates for this field , because the surface energy of sapphire glass changes at each stage of grinding, which is different from the surface energy of ceramic disks. If a UV-curable double-sided tape without a substrate is used, the adhesive layer must remain on the surface when the sapphire sheet is removed after curing. On ceramic disks or sapphire sheets, which seriously affects the processing efficiency; at the same time, it is difficult to guarantee the adhesive overflow property of non-substrate tape processing

Images