Preparation of waterborne synthetic leather (dry Pu and wet PU)

The title of waterborne synthetic leather is relative to PU leather. To find out what is water-based synthetic leather, we must first find out the classification and structure of synthetic leather.

Bright star series

PU synthetic leather is divided into dry Pu and wet PU. The dry PU leather is composed of four layers: base cloth, adhesive layer, surface layer and surface treatment layer. The wet PU leather is composed of five layers: base cloth, adhesive layer, foaming layer, surface layer and surface treatment layer. The wet PU leather has one more foaming layer than the dry PU leather. Traditionally, adhesive layer, foaming layer, surface layer and surface treatment layer are all made of polyurethane (PU) chemical materials containing DMF and other solvents.

Strictly speaking, DMF and other solvents are all replaced by chemical materials with water as the solvent. The synthetic leather made by coating the adhesive layer, foaming layer, surface layer and surface treatment layer of the water solvent on the surface of the substrate is called water-based leather.

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On the surface, only DMF and other solvents in chemical materials have been replaced by water, but from the perspective of scientific research, there have been qualitative changes in raw material selection, distribution design, process, equipment selection and other aspects.