Selection of polyurethane elastomer release agent

Polyurethane elastomer, also known as polyurethane rubber, is a composite material with a high content of amino acid esters. Due to its high elasticity, aging resistance, oil resistance and other superior properties. Widely used in automotive components, shoe soles, rubber rollers, casters, etc. Due to the fact that elastomers belong to strong plate-like polymer materials, their adhesion to metal molds is particularly strong. Without the use of a release agent, it is impossible to remove the product from the mold, or it is difficult to remove the product from the mold with an inappropriate release agent. So, what are the commonly used release agents?

Category 1: Silicone oil or silicone esters

 Prepared from raw materials such as toluene or dichloromethane and diluents, sprayed or wiped onto the mold, and released after vulcanization molding. However, the demolding performance of this type of release agent is not ideal, mainly due to insufficient demolding force.

Category 2: Wax or liquid paraffin, Vaseline, etc

This type of release agent is diluted with a diluent and sprayed or coated on the mold. After vulcanization and molding, it is usually stuck in the mold cavity and difficult to remove, and the mold is very dirty.
 

So the correct selection of suitable release agents should meet the following characteristics:

Because during the vulcanization process of elastomers, the vulcanization temperature is higher than that of general polyurethane molding, and the bonding degree is also higher than that of general polyurethane. Therefore, in order to comply with the molding process of elastomers, the demolding agent is generally composed of heat-resistant modified silane and special additives, which have good isolation effect, good film-forming ability, high temperature resistance, and strong demolding ability. Moreover, the product has characteristics such as non transfer and non fouling of the mold.