Preparation of EVA/PVA/PU Multi-component Water-based Adhesive

The stability, compatibility, bond strength and other parameters of the polymer emulsion system were investigated. The effects of different additives and additives content on the water resistance of water-based adhesive were studied. The results showed that the system stability is good when the content of PU in EVA/PU blend system is below 20%, the system can maintain a good compatibility when the EVA/PU ratio between 85/15 and 70/30, DA-103, BF-24 and U54 are suitable as the main raw materials of the blending system, ethylene glycol with its content lower than 2% is suitable as the assistant of the system. With the investigation of shear strength, water resistance, opening time and other factors, the optimum formula is: EVA emulsion 55%, PVA emulsion 30%, PU emulsion 14.5%, ethylene glycol 0.5% (mass fraction, relative to the total adhesive).