Study on the modification of APAO-V based hot melt adhesive with vinyl triethoxysilane(VTES)and its properties
A reactive poly alpha olefin vinyl triethoxysilane(APAO-V)based hot melt adhesive with high bonding strength,solvent resistance,and heat stability was prepared by grafting modification of poly alpha olefin(APAO)based hot melt adhesive with vinyl triethoxysilane(VTES).The effects of different mass fractions of VTES modified APAO on the various properties of the prepared hot melt adhesive system were explored,in order to determine the optimal ratio.The research results showed that:(1)The FT-IR curves indicated that VTES underwent hydrolysis and self-crosslinking,and VTES modified APAO successfully.The XRD diffraction curves indicated that VTES grafted APAO had no effect on its crystal morphology.(2)When the mass fraction of VTES was 8%,the softening point and rotational viscosity of VTES modified APAO based hot melt adhesive reached their maximum values,which were 147.7℃and 7 025 mPa·s,respectively.APAO based hot melt adhesive had the best thermal stability performance.(3)The reactive APAO-V based hot melt adhesive prepared by modifying APAO with 8%VTES showed improved bonding strength at room temperature,high temperature(60℃),and low temperature(-20℃),among which the best bonding enhancement effect was at room temperature and the peel strength increased 15.0 N/cm.After being immersed in water for 28 days,the peel strength of the modified hot melt adhesive could still reach 22.3 N/cm.(4)The reactive APAO-V based hot melt adhesive prepared by modifying APAO with 8%VTES showed that,the single lap shear strength of hot melt adhesive on four different plastic substrates(PE,PVC,PP and ABS)was compared,the bonding performance of hot melt adhesive prepared by APAO after modification was greatly improved.
hot melt adhesivevinyl triethoxysilaneAPAO-V based hot melt adhesiveheat resistancebonding strength
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