Synthesis And Application Of Higher Fatty Acid-modified Rosin Ester

In this paper, firstly three different of rosin esters (rosin pentaerythritol ester, rosin glycerol ester, rosin triethylene glycol ester) were synthesized. Secondly the four different types of higher fatty acids (lauric acid, myristic acid, palmitic acid, stearic acid) were used to modify rosin esters, through doing experiment, the best higher fatty acid for reducing viscosity was elected. Finally stearic rosin pentaerythritol ester, stearic rosin glycerol ester, lauric rosin triethylene glycol ester were synthesized.In the synthesis section, factors affecting the reaction including reaction temperature, reaction time, species of catalyst, species of higher fatty acid, material ratio were investigated by single-variable experiment. The performance of product was analyzed. The structure of product was characterized by FT-IR.In the application section, the effects of higher fatty acid-modified rosin ester on low temperature resistance, initial tack,180°peeling strength, held sticky in HMPSA were studied. The effects of higher fatty acid-modified rosin ester on low temperature resistance, opening hours in solvent adhesives were studied. The main conclusions were found as follows:1. Stearic rosin pentaerythritol ester with low acid value, low softening point, low viscosity was prepared though the esterification of stearic acid with rosin pentaerythritol ester. The structure of product was characterized by FT-IR. The optimum conditions were found as follows:Z501as catalyst, rosin pentaerythritol ester and stearic acid with a mass ratio of200:70, reaction temperature260℃, reaction time8h.2. Stearic rosin glycerol ester with low acid value, low softening point, low viscosity was prepared though the esterification of stearic acid with rosin glycerol ester. The structure of product was characterized by FT-IR. The heat resistance was analyzed by TG. The optimum conditions were found as follows:Z501as catalyst, rosin glycerol ester and stearic acid with a mass ratio of200:45, reaction temperature250℃, reaction time7h.3. The stearic rosin glycerol ester was used as tackifying resin in hot melt pressure sensitive adhesive (HMPSA), and the influences of stearic rosin glycerol ester content were discussed on HMPSA’s properties. The results showed that the HMPSA’s maximal annular initial tack and180°peeling strength were increased by54.81%and35.29%, when mass fraction of stearic rosin glycerol ester was10%. Adding appropriate amount of stearic rosin glycerol ester could efficiently reduce HMPSA’s glass transition temperature and could improve HMPSA’s cold-resistance.4. Rosin triethylene glycol ester was prepared though the reaction of lauric acid rosin and triethylene glycol. The structure of product was characterized by FT-IR. The molecular size and distribution was analyzed by GPC. The optimum conditions were found as follows:Ian cui as catalyst, rosin triethylene glycol and lauric acid with a mass ratio of150:74.5:45, pouring lauric acid after rosin reacting with triethylene glycol at250℃for2hours, then elevating temperature to275℃and held for seven hours,5. Liquid rosin resin (KL300) synthesized in this experiment and rosin methyl ester have good compatibility with the polymer, good solvent solubility, excellent operating viscosity. They all can improve the low temperature performance, increase initial tack of adhesive, and have little effect of cohesive force on adhesive. They can be applied to a variety of hot melt pressure sensitive adhesive.6. Liquid rosin resin (KL300) synthesized in this experiment and rosin methyl ester used in solvent adhesives could extend the solvent adhesive’s opening hours, reduce the drying rate.7. Liquid rosin resin (KL300) synthesized in this experiment has good plasticizing effect on SBS adhesives.