Research and development of UV-curing strippable pressure sensitive adhesive tape
The UV-curing strippable pressure sensitive adhesive tape was prepared by using polyacrylate pressure sensitive adhesive as the base adhesive,adding oligomers,multifunctional active diluents,and photoinitiators to form the adhesive solution,and then coating it on the PET-based film.The influence of the dosage of oligomers,multifunctional active diluents and photoinitiators on the properties of adhesive tape was studied.The optimal dosage of each component was optimized by testing the 180° peel strength and residual adhesive situation,and the UV curing process was characterized by using Fourier transform infrared spectroscopy.The research results showed that,(1)When the matrix of polyacrylate adhesive 129Awas 100 parts,the amount of oligomer was 30 parts,the amount of active diluent was 50 parts,and the amount of photoinitiator was 0.8 parts,the UV-curing strippable adhesive tape prepared had outstanding adhesive reduction effect,no residue,and excellent comprehensive performance.The initial adhesion force with the wafer was as high as 10.3 N/25 mm,but it instantly lost adhesion after UV light irradiation,with an adhesion force of 0.3 N/25 mm.It was easy to peel off and met the special processing requirements of the chip.(2)The UV curing reaction process was characterized by using Fourier transform infrared spectroscopy.As the light curing process progressed,the infrared absorption peak of the carbon-carbon double bond gradually weakened to disappeared,and the carbon-carbon double bond crosslinking reaction occurred in the system,forming the crosslinked structure and causing the adhesive to change from"sticky"to"non sticky".
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