Synthesis of organosilicone acrylate prepolymer and its application in UV curing acrylate pressure sensitive adhesive
Organosilicone acrylate prepolymer containing urethane groups were prepared by using single-terminated hydroxysilicone oil,isophorone diisocyanate and hydroxyethyl acrylate.Using this prepolymer as a hard monomer,2-ethylhexyl acrylate as a soft monomer,and low biotoxicity 2,4,6-trimethylbenzoylphenylphosphonate ethyl ester(TPO-L)as a photoinitiator,acrylate pressure sensitive adhesive with excellent water absorption,water permeability,water resistance,and bonding properties was prepared by UV curing polymerization.The optimal process parameters for the synthesis of prepolymer,such as temperature,time,and catalyst dosage,were investigated by using the reverse titration method with dibutylamine.The effects of illumination time,types and amounts of photoinitiators on the curing degree of pressure sensitive adhesive,as well as the effects of prepolymer content on the bonding performance,water absorption,and moisture permeability of pressure sensitive adhesive were studied.The research results showed that in the synthesis of organosilicone acrylate prepolymer,the first step reaction temperature was 40 ℃,the second step reaction temperature was 50 ℃,both the reaction time was 60 minutes,and the optimal catalyst dosage was 0.10％(mass fraction).In the preparation of modified pressure sensitive adhesive,when the illumination time was 120 s,the photoinitiator TPO-L dosage was 3％(mass fraction),the prepolymer content was 20％,the photocuring degree of pressure sensitive adhesive was relatively high,the initial adhesion force was 21# ball,the 180° peel strength was 5.7 N/(25 mm),the holding power exceeded 360 h,and the 180° peel strength for non-polar surface of PP board was 3.2 N/(25 mm).The modified pressure sensitive adhesive had good water absorption and moisture permeability.
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