Increased storage stability of marble adhesive based on unsaturated polyester resin

Abstract

In this paper, different combinations of accelerators and inhibitors were used to cure marble adhesive based on an unsaturated polyester resin. N, N- dimethyl aniline (DMA, NL-63), N, N-dimethylparatoluidine (DEP, NL-65), and ethoxylates of p-toluidine (Pergaquick A150 p.m.) were used as amine accelerators. Benzoyl peroxide (BPO) was used as a medium temperature decomposition initiator. Hydroquinone and 1,4- naphthoquinone were used as polymerization inhibitors. To study the curing behavior, gel time, pseudo-adiabatic exothermic, and storage stability measurements have been used. The low-temperature initiator decomposition rate has also influenced the exothermic peak and cure rate at various accelerators. It is shown in this study that for N, N- dimethyl aniline (DMA, NL-63), N, N-dimethylparatoluidine (DEP, NL-65) and Ethoxylates of p-toluidine (Pergaquick A-150) promoters systems, with the increasing of pergaquick A-150 concentration, namely high reactive accelerator, causes the exothermic parameters sharply change. It might be due to the more reactive nature of pergaquick A-150 in comparison with other accelerators reactivity. Due to this study, using a dual system of inhibitor, the storage stability of marble adhesive was increased. Now we can say, a judicious choice of a dual inhibitor and a dual accelerator can prevent short time exothermic reactions with high storage stability, so a dual system of the inhibitor can be much more effective than a single one.