Xinhe Gel Industry

(1) In the case of reactive adhesives mixing of the two components, the crosslinking reaction to produce a cured product.

(2) the preparation, the two components can be adjusted feed composition and molecular weight, so that a suitable viscosity at room temperature, can be made solvent-free or high solid content of the two-component adhesives.

(3) can generally be cured at room temperature, by selecting the adhesive material prepared by adding a catalyst or curing rate can be withered section. In general, two-component polyurethane adhesives have a greater initial adhesion, called heat-cured, the adhesive strength is greater than the final one-component adhesives, structural adhesives to meet the requirements.

(4) the amount of the two components can be adjusted within a certain range, generally there is a certain tolerance. The two components NCO / OH molar ratio generally greater than or equal L, when cured, part of the NCO groups involved in the curing reaction of the adhesive, chemical adhesion, excess NC0 group during heat curing, further produce allophanate, biuret, increase the degree of crosslinking, improved layer cohesive strength and heat resistance. For solvent-free two-component polyurethane adhesives, the molecular weight is not starting because of the components, in general, NCO / OH molar ratio equal to or slightly greater than l, in favor of fully cured, especially when the adhesive seal, attention NCO component can not be too excessive. For a two-component solvent-based adhesives, its main agent larger molecular weight, preferably tack performance, the amount of the two components can be adjusted over a wide range, NCO / OH molar ratio of less than 1 or greater than the number 1 times. When the NCO component (curing agent) overdose more occasions, polyisocyanate from poly form a tough layer of adhesive suitable for bonding hard material; the NCO component with less occasions, the soft layer can be used bonded leather, fabric and other soft materials.

Since the advent of two-component polyurethane adhesive, since there have adjustable properties, adhesion strength, bonding a wide range of advantages, it has become the largest varieties of polyurethane adhesives, the largest output of products.