铝塑复合用接枝型粘结树脂

使用IR和DSC对 4种铝塑复合粘结树脂进行了表征 ,发现它们均属于接枝型的聚烯烃树脂 ,树脂中除含有化学接枝的马来酸酐外还含有游离的未接枝MAH单体以及MAH的均聚物。接枝酸酐在放置过程中会逐渐吸收空气中的水分水解为羧酸。MAH接枝率、基体树脂的结晶度对树脂的粘结性能具有影响

Adhesive Resins Manufactured by Grafting of MAH onto Polyolefins for Aluminum-Plastics Compounding

The structures of four adhesive resins for aluminum-plastics compounding were characterized by using IR and DSC. It was found that all the four resins were produced by the method of grafting of maleic anhydride (MAH) onto polyolefins.Besides the grafted MAH,the resins also contained ungrafted (free) MAH monomers and polymaleic anhydride. The grafting ratios for all the four resins were lower than 0 4g MAH/100g resin, with the highest grafting ratio of 0 35g MAH/100g resin in Polybond 3009 and the lowest grafting ratio of 0 08g MAH/100g resin in ADMER L2100.The anhydride groups grafted in the resins could gradually absorb moisture in the air and then be hydrolyzed into the carboxyl groups, giving rise to the decrease of the reactivity of the grafted groups.The adhesion performance of the resins in the interface of Al and PE depended not only on the grafting ratio of maleic anhydride, but also on the crystallinity and flexibility of the resin matrix.The lower of the crystallinity and the more flexible molecular chain were , the higher of the adhesion strength could be.