Prepartion Of HMPSA For Label And Study Of Influencing Factor On The Properties Of HMPSA

Hot melt pressure sensitive adhesive (HMPSA) used in label had many quality problems such as unstable quality or permeability in applications, to cause the label wrinkling, sticking out or falling off. So the quality guarantee of HMPSA has been particularly outstanding.The selection of optimum tackifying resin and the analysis of influencing factors of HMPSA were firstly researched in this paper. And the optimum formula of label HMPSA was obtained. The results indicate that the optimum tackifying resin for label HMPSA was rosin pentaerythritol ester or terpene resin with softening point of 100℃. The existence of naphthenic oil has affected the initial adhesion and oil penetration of label HMPSA the most. The optimum formula of label HMPSA was SIS-A: naphthenic oil 4010: tackifier resins = 30:25:50(mass ratio).Influences of the structure variable of styrene series thermoplastic elastomer on the properties of HMPSA were also studied. The research demonstrates that when the styrene content was increased from 14% to 30%, the softening point of HMPSA was increased from 75℃to 89℃,and 180opeel strength was increased from 5.6 N·cm-1 to 8.4 N·cm-1,and the initial adhesion was decreased from 2.2 cm to 5.4 cm; when the diblock copolymer content was increased from 7% to 38%,180opeel strength was increased from 4.2 N·cm-1 to 10.1 N·cm-1; when the melt flow index was decreased from 8 g/10min to 25 g/10min, melt viscosity of 175℃was decreased from 9200 mPa·s to 2200 mPa·s.At last, differential scanning calorimetry (DSC) analysis was used to research the compatibility of various kinds of tackifying resin and styrene series thermoplastic elastomer. Through the study we found that the DSC curve of styrene type-thermoplastic elastomer presented typical micro-structure of two-phase separation.The quantitative relationship between Tg and the softening point of different tackifier resins was diverse. The tackifying resins which were dissolved in different phases of SIS had different effects on the two phases′Tg.