Preparation and properties of low modulus pressure sensitive adhesive in a wide temperature range
Polyacrylate pressure sensitive adhesive was prepared by using 2-ethylhexyl acrylate(2-EHA)as the soft monomer,methyl acrylate(MA)as the hard monomer,4-hydroxybutyl acrylate glycidyl ether(4-HBAGE)and hydroxyethyl acrylate(2-HEA)as the functional monomers,1,6-hexanediol diacrylate(HDDA)as the internal crosslinking monomer,etherified amino resin(L-109-65)as the thermosetting crosslinking agent through solvent-based free radical chain addition polymerization process.The effects of the ratio of soft and hard monomers in the original adhesive formula,the addition amount of HDDA,and the addition amount of thermosetting crosslinking agent on the pressure sensitive adhesive performance and elastic modulus at different temperatures were explored.The research results showed that,(1)The increase in the mass ratio of hard monomer(MA)would cause a continuous decrease in the tack of acrylic pressure sensitive adhesive,an increase in holding power,and first an increase in peel strength followed by a decrease.The storage modulus gradually decreased as the sample temperature increased.Based on the comprehensive performance of pressure sensitive adhesive and modulus data at different temperatures,a mass ratio of 89∶11 for soft and hard monomers was selected preferably.(2)When the addition amount of tert-butyl peroxybenzoate(TBPB,initiator C)was 0.2%and the addition amount of HDDA was 0.3%,the weight average molecular weight(Mw)of the prepared acrylic pressure sensitive adhesive could reach 1.02×106,and the number average molecular weight(Mn)could reach 3.10×105.(3)The effects of the addition amount of thermosetting crosslinking agent on the properties of pressure sensitive adhesive and modulus at different temperatures were investigated.The appropriate addition amount of thermosetting crosslinking agent was 0.45%(mass fraction).(4)The prepared acrylic pressure sensitive adhesive not only had high molecular weight in the original adhesive,but also had good high-temperature(80℃)holding power,good initial tack,and high peel strength,which was a solvent-based acrylic pressure sensitive adhesive with excellent pressure sensitive performance and low modulus in a wide temperature range.
acrylic pressure sensitive adhesivelow modulushigh molecular weightsolvent type
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