松香连续法制备EVA热熔胶初探

以探讨松香连续法制备EVA热熔胶的可行性为目的,通过对比实验比较了连续法和分步法的优缺点,考察了连续法制胶中松香酯化的合理时间及松香与EVA合适的质量配比,结果表明,松香连续法制备EVA热熔胶在实验阶段是可行的;连续法所得热熔胶与分步法所制热熔胶相比有色泽浅、粘合力强的特点;在以ZnO（松香的0.3%）作催化剂、季戊四醇用量为松香的15%、复配抗氧剂用量为松香的0.2%、石蜡用量为EVA质量的10%、酯化温度为270℃、制胶温度为200℃的条件下,连续法制胶中松香酯化的合理时间为6~7h,松香与EVA合适质量配比为30/50～40/50;在此工艺条件下制得了色泽淡黄、粘合强度为675g、流动性为2.5mm/10g的EVA热熔胶。

PRIMARY EXPLORATION OF EVA HOT MELT ADHESIVE PREPARATION BY ROSIN CONTINUOUS METHOD

The feasibility of EVA hot melt adhesive preparation by rosin continuous method was discussed in this paper.The advantages and disadvantages of continuous method and multistep method were compared by contrast experiments,reasonable time of rosin esterification and proper mass ratio of rosin with EVA were investigated in adhesive preparation by continuous method.The results show that it is feasible for EVA hot melt adhesive preparation by rosin continuous method in the experimental stage;compared with multistep method,the hot melt adhesive prepared by continuous method has the traits with light color and strong adhesion;30/50～40/5 when ZnO（0.3% of rosin）is the catalyst,pentaerythritol amount is 15% of rosin,the dosage of compound antioxidant is 0.2% of rosin,paraffin quality is 10% of the EVA,the reaction temperature is 270℃,the system rubber temperature is 200℃,the reasonable time of rosin esterification is 6 to 7 hours in adhesive preparation by continuous method,the suitable mass ratio of rosin with EVA is 30/50～40/50;EVA hot melt adhesive prepared in this process appeared the color of light yellow,bond strength of 675 g,fluidity of 2.5mm/10g.