Polyurethane (PU) is a kind of organic polymeric compounds containing repeated carbamate group (NHCOO) in the main chain.Polyurethane polymer materials have the advantages of wear resistance, high temperature resistance, good adhesion, easy processing, low price, but some polyurethane water resistance, heat resistance is poor, need to be modified by specific methods, in order to achieve the purpose of optimization.Waterborne polyurethane (WPU) uses water as the dispersion medium, avoiding the traditional organic solvents serious pollution, harm to human health and other shortcomings, at the same time save a lot of organic solvents, greatly reducing the cost. With the continuous improvement of people's environmental awareness, environmental protection laws and regulations are becoming more and more perfect. Waterborne polyurethane has become a hot topic. Based on its advantages of non-combustible, high safety and easy modification, it is widely used in coatings, adhesives, fabric finishing agents and coating agents.

① Water-based polyurethane coating completely or basically contains no solvent, no odor, no pollution, has the advantages of non-combustible, low cost, can be diluted directly with water when using, easy to use, easy to clean.

②The viscosity of waterborne polyurethane does not vary significantly with the change of polymer relative molecular weight. High molecular weight waterborne polyurethane can be prepared at low viscosity, which is very favorable for improving the cohesion strength of resin. The viscosity of solvent-based polymers increased exponentially with the increase of molecular weight, and gels were easily produced when the molecular weight was larger.

③The viscosity of waterborne polyurethane is generally lower than that of solvent type. The smaller the dispersion diameter of waterborne polyurethane is, the greater the viscosity is. The viscosity of solvent-based polyurethane increases obviously with the increase of solid content. The viscosity of solvent-based polymer can be adjusted by controlling solid content or solvent amount, while the viscosity of waterborne polyurethane needs to be adjusted by thickening agent.

④Water-based polyurethane has good compatibility with a variety of water-based resins, and can be mixed to improve performance or reduce cost. It is necessary to select water-based resins that match the charge properties and acid-base of ionic waterborne polyurethane, otherwise condensation may occur. Due to the compatibility of polymers and the solubility of resins in solvents, solvent-based polyurethanes can not be blended with other resins.

Compared with organic solvent polyurethane coatings, waterborne polyurethane coatings have the advantages of low application cost, pollution-free, easy handling and good bonding effect. It has a good development prospect in adhesives and coatings industry. Therefore, according to the statistical data, it is predicted that the domestic consumption of water-based polyurethane in 2026 will be about 294,000 tons, with an annual compound growth rate of about 11.7%. At present, the new water-based coatings, which are produced with water-based polyurethane dispersion as large monomer, are gradually replacing solvent-based polyurethane coatings, and are widely used as waterborne wood lacquer and waterborne wood sealing primer. And the paint film wear-resistant, fast drying, good appearance, good solvent resistance waterborne polyurethane coatings in the domestic wood paint field occupy a market share is gradually increasing. In addition, waterborne polyurethane dispersion can also be used as waterborne plastic coatings, waterborne industrial coatings, waterborne anti-corrosion coatings, waterborne polyurethane interior and exterior coatings, waterborne polyurethane adhesives, etc., to meet the performance requirements of different industries.

At present, our company's waterborne polyurethane and waterborne polyurethane dispersion andwaterborne polyurethane resin, has been put on the market, the market feedback is good, the performance is excellent, fully able to meet the complex needs of customers of various packaging structures.