The next step of the Dowonsol Chemical Co., Ltd. is to choose the word "environmental protection". How to prevent pollution, energy conservation and emission reduction from the source, synthetic leather enterprise has given the answer. Jointly developing water-based polyurethane production of synthetic leather project, to international advanced technology, crack pollution problems.

It is understood that one of the pollution sources in the traditional synthetic leather industry is the raw material oil polyurethane used in leather manufacturing. Polyurethane is made from toluene, xylene, acetone, acetic acid, ethyl ester and di N-Methylformamide (DMF) as the main solvent. There are some toxic and auxiliary uses. The waste gas and liquid generated during the production process are prone to polluting the environment. 

At present, the disposal of pollution emissions is mainly focused on recycling and reuse, with high costs. If pollution can be eliminated from the source, it is equivalent to process reengineering and can achieve clean production throughout the entire process. Waterborne polyurethane, in short, is a non-toxic and environmentally friendly product made by replacing toxic chemical solvents with water. Therefore, in the production process of synthetic leather, toxic waste gas and liquid are not emitted, effectively solving the pollution problem of the traditional synthetic leather industry.

 With the increasing awareness of environmental protection and the improvement of environmental regulations in various countries, waterborne polyurethane coatings are receiving increasing attention. Waterborne polyurethane has excellent elasticity, abrasion resistance, toughness, adhesion and excellent low-temperature impact resistance. However, polyurethane also has some defects, such as poor water resistance of the coating film, unsatisfactory lotion stability, self thickening, solid content and other properties, and low mechanical strength, especially low hardness. Due to these defects of polyurethane, most of the water-based polyurethane currently used has been modified. There are many kinds of polyurethane modification, including acrylic modification, epoxy resin modification, Castor oil modification, organosilicon modification, organic fluorine modification, nano modification, etc. There have been many literature reviews on the modification of traditional acrylic and epoxy resins. This paper introduces waterborne polyurethane dispersions modified by organosilicon, Castor oil, organic fluorine and nano particles.