The Adhesion of ABS Resin to a Phosphor Bronze Plate Treated with Triazine Trithiols by Injection-molding

Abstract

In this report, a method to adhere ABS resin and phosphor bronze in a mold by injection-molding is proposed. For this investigation of adhesion, a phosphor bronze plate treated with 1, 3, 5-triazine-2, 4-dithiol-6-sodium mercaptide (TTN) aq. solution was inserted in a mold and then ABS resin was injected. ABS resin showed good adhesion to the phosphor bronze plate treated with TTN as the ABS resin showed cohesive failure in the matrix but not at the interface in a shearing test. The adhesive strength was dependent upon the conditions of TTN treatment and the molding and the content of the polybutadiene component in the ABS resin. A TTN concentration in the range of 0.8-1×10-3mol/l and an immersion time in the TTN soln. in the range of 10-60s were the optimum conditions. Mold temperatures above 80°C gave higher adhesive strength and ABS containing 19-20% polybutadiene component gave the highest adhesive strength. Under optimum conditions, the adhesive strength exceeded 4MPa. The mechanism of adhesion is believed to be the formation of chemical bonding between the Cu-triazine mercaptide coating on the phosphor bronze plate and the butadiene component in the ABS resin.