In the process of using polyurethane ink, if the alcohol solvent is too large and can not be fully volatilized and dried in the printing process, it is very easy to produce product quality problems such as delamination.
The reason is: because the polyurethane resin in the polyurethane ink itself is also - Oh terminated, and the adhesive mechanism of polyurethane adhesive is that the main agent of polyurethane with - Oh sealing reacts with the polyurethane curing agent with - HCO sealing end to form polyurethane with large molecular weight and form adhesive force. Therefore, alcohols with - oh and substances with - NH2 have greater interference on the composite processing, which reduces the amount of curing agent participating in the main agent reaction of adhesive, and affects the bonding strength. Moreover, the alcohol diluting solvent in polyurethane ink will react with curing agent, affecting the bonding quality.
Dongguan Beite packaging materials Co., Ltd. - located in Dongguan City, the world's manufacturing city, is a subsidiary of Beite packaging (China) Co., Ltd., with a plant area of 6000 square meters. It is a flexible packaging enterprise integrating R & D, production and sales. It has a complete set of domestic advanced production equipment, a scientific and humanized management system and a group of experienced technical personnel For backing, to provide customers with quality products and first-class service. The company produces composite bags, roll film, fruit bags, aluminum foil bags, suction mouth bags, self-supporting bags, zipper bags, anti-static bags, special-shaped bags, etc., which are suitable for the internal and external packaging of food, daily chemicals, electronics, toys, medicine, cosmetics, industrial products and other industries. We uphold the integrity of cooperation, good quality, good service business philosophy, won the industry's approval, products sold to all over the world; welcome friends from all walks of life to inquire, visit our factory to investigate guidance and business negotiations.