The principle of polyurethane release agent

The bonding force between polyurethane and mold surface is generally believed to be caused by two reasons.

Firstly, the surface of the mold is usually covered by a thin or even monolayer water film, which reacts with isocyanates to produce strong adhesion,

Secondly, adhesion is caused by the chemical bonds formed by the reaction between the polar groups on the inner surface of the mold and the polar groups of polyurethane and polyurethane.

In order to make the product easy to demold, it is necessary to have a dense and smooth film on the surface of the mold, which is required to not react with the raw materials, have a certain degree of adhesion to the mold, and have a certain degree of flexibility. Spray the effective demolding substance (usually an inert substance) evenly onto the mold through a medium (water), and after the medium (water) evaporates, a smooth film is formed, thus achieving the demolding effect.