⒈ Water-based glue is classified by material:
Polyvinyl alcohol water-based adhesive, vinyl acetate water-based adhesive, acrylic water-based adhesive, polyurethane water-based adhesive, epoxy water-based adhesive, phenolic water-based adhesive, silicone water-based adhesive Adhesive, rubber water-based adhesive.
⒉ Water-based glue is classified by application:
Construction water-based adhesives, packaging water-based adhesives, automotive water-based adhesives, shoe-making water-based adhesives, daily water-based adhesives
At present, the synthesis methods of water-based polyurethane adhesives are relatively mature, mainly including the following methods:
(1) Introduce some hydrophilic groups into the polyurethane resin structure to make it self-emulsifying.
(2) Acetone method: First prepare a high-viscosity prepolymer, add acetone to reduce the viscosity, then extend the chain with a hydrophilic monomer, add it to water under high-speed stirring, disperse it in water by strong shearing, and reduce the viscosity after emulsification. The solvent is recovered by pressure distillation to obtain the PU water dispersion system.
(3) Blocked isocyanate method: Select a suitable blocking agent to protect the end-NCO group of the water-sensitive isocyanate to make it inactive, and then add a chain extender and a cross-linking agent to co-emulsification to make an emulsion. , Unmasked by a certain temperature and special catalyst, regenerates -NCO end groups, and extends the chain to prepare water-based polyurethane
Winlong is a hot melt adhesive manufacturer, if you want to know more, please contact the adhesive experts at internetwoodglue.com. Our team of adhesive experts has served customers in dozens of industries. We look forward to the opportunity to be your trusted solution for all your adhesive needs
