The amount of dichloromethane used in polyurethane foaming varies depending on the formula and density.
Dosage difference: Soft foam formula with a density of 8kg/m3: The amount of dichloromethane is 30 parts. Soft foam formula with a density of 12kg/m3: The amount of dichloromethane is 15 parts. Soft foam formula with a density of 16kg/m3: The amount of dichloromethane is 9.3 parts.
Uses and impacts:
Dichloromethane is mainly used as a physical foaming agent in polyurethane foaming to help reduce the density of the foam. Its dosage affects the physical properties of the foam, such as density and elasticity. Specifically:
Density: The amount of dichloromethane used is inversely proportional to the density of the foam. The more it is used, the lower the density of the foam. Elasticity: The appropriate amount of dichloromethane can make the foam softer and more elastic, but it may reduce its tear strength and rebound rate.
Substitutes:
Due to environmental reasons, the use of dichloromethane may be restricted in some areas. Substitutes such as water can also be used for foaming, but the effect and dosage will be different.
In summary, the amount of dichloromethane in polyurethane foaming needs to be adjusted according to the specific formula and the required foam properties to ensure the quality and performance of the final product.