Study on the preparation and properties of UV-curable hydroxylacrylate pressure sensitive adhesive
Using 2-ethylhexyl acrylate(2-EHA)as soft monomer,acrylic acid(AA)and hydroxyethyl acrylate(HEA)as polar monomers,methyl methacrylate(MMA)and cyclohexyl methacrylate(CHMA)as hard monomers,azobisisobutyronitrile(AIBN)as initiator,and ethyl acetate(EA)as solvent,hydroxylacrylate polymers were synthesized by free radical polymerization.After UV curing,pressure sensitive adhesive(PSA)was prepared,and it was subsequently characterized and analyzed.The effect of reaction temperature on the relative molecular weight and distribution of the polymer,the dosage ratio(mass ratio)of HEA/2-EHA,and the weight average molecular weight(Mw)of the polymer on the performance of the pressure sensitive adhesive,as well as the intrinsic relationship between bonding properties and viscoelasticity were investigated.The research results showed that,(1)Infrared characterization indicated that all monomers were involved in the reaction and the target product was successfully prepared.GPC testing of Mn,Mw,and PDI showed that as the reaction temperature decreased,Mn and Mw gradually increased,while PDI first increased and then gradually decreased.The actual Tg of polymer D was tested by DSC method to be-56.24℃.(2)As the ratio of HEA/2-EHA increased,the maximum tensile strength and tensile strength gradually increased,the elongation at break gradually decreased,the 180° peel strength and initial tack gradually decreased,and the holding time gradually increased.Taking all factors into consideration,the pressure sensitive adhesive prepared from polymer D exhibited relatively optimal overall performance.(3)As Mw increased,the elongation at break first decreased and then stabilized,the maximum tensile force and tensile strength first increased and then decreased,the 180° peel strength and initial tack gradually decreased,and the holding time first increased and then gradually decreased.Taking all factors into consideration,the pressure sensitive adhesive prepared from polymer D2 exhibitd relatively optimal overall performance.(4)When the dosage ratio of HEA/2-EHA was 9/83,the Mw of polymer D6 was 854.82 kDa,and the diluent contained 0.13%HDDA and 7%IBOA,the elongation at break of pressure sensitive adhesive P-D6-2 was 1 396%.The maximum tensile force and tensile strength were 1.563 N and 0.313 MPa,respectively.The 180° peel strength,loop tack,and holding time were 17.36 N/25 mm,27.62 N/25 mm,and 16.51 h,respectively.
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