Bonding strength of polyurethane and pp board: I have tried it and it can be bonded, but the adhesion is poor. Polypropylene has weak polarity and polyurethane has strong polarity. The bonding effect between the two is not good. Skori Polyurethane Specializing in the production of polyester polyols. Apply glue evenly on the surface of the material to be bonded, let it cool for 3 to 5 minutes, and then fit the two materials together.
The use of polyurethane and pp board
Generally, it is cleaned with alkaline water containing surfactant and organic solvent, and then washed and dried, or directly cleaned with organic solvent. Rusty metal generally needs to be removed with sandpaper or a wire brush to remove surface rust.
One-component moisture-curing polyurethane adhesive is mainly cured by moisture in the air, so a certain air humidity should be maintained, and it is better to cure slowly at room temperature. If the air is dry, apply a small amount of water to the glued surface to promote curing. If the glue is sandwiched between dry and hard adherends, and the glue layer is thick, the interface and external moisture cannot easily penetrate into the glue, and the curing will be incomplete. In this case, a very small amount can be injected into the glue. Moisture.