Generally speaking, the innovation of PU composite leather is completed according to the following procedures: Innovative additives are added to the PU composition process: PU resin → + innovative additives + innovative base fabrics and other substrates + fillers + color powder → manufactured through various innovative artificial leather processes = PU composite leather. It can be seen that the research and development of additives plays a vital role in the development of PU composite leather. In general, additives are generally divided into the following five categories: 1. Defect treatment. Such as: defoaming agent, humectant, tackifier, dispersant, etc. This type of material plays a vital role in the manufacturing process of PU resin and PU composite leather. Without them, PU resin and PU composite leather cannot be produced normally; 2. Improve processing function. Such as: high peeling additives, tearing additives, gold foil additives, rubbing additives, etc. These materials are important components of PU resin and PU composite leather, which greatly change its physical properties and feel, thereby meeting people's requirements; 3. Add functions that PU materials themselves do not have. Such as: water repellent, far-infrared proof material, aromatic material, luminous material, etc. The addition of such materials makes synthetic leather have functions that PU itself does not have, and then functional PU resin and functional PU synthetic leather appear to meet more human needs;
Adjust the surface effect and feel of PU synthetic leather. Such as: slip agent, wax feel agent, mist wax material, color-changing material, wet wax feel material, velvet feel material. These materials are mainly used to provide special effects on the surface of PU synthetic leather to meet people's personalized needs and the pursuit of fashion and beauty
Surfactant, special resin, etc. Traditionally, such materials are not originally in the category of additives. They are new materials made by compounding or combining additives with ordinary PU resins. Generally used in the surface layer or coating layer of PU synthetic leather to give synthetic leather a special surface effect and feel.
At that time, the China Plastics Processing Association had a newer accounting standard. In order to unify the standard, we classified the surfactant and special resin into the scope of additives. Such as various matte, bright, scorched and other special resins. As PU composite leather develops towards mid-to-high-end, personalized and functionalized, the use of surfactants and special resins is increasing, and the types are increasing. It accounts for an increasing proportion in the manufacturing cost of PU composite leather.