Study On Construction Performance Of Waterborne Two-component Polyurethane Coating

Waterborne two-component polyurethane coating(2K-WPU)has the characteristics of environmental protection and high performance,which is the main direction of the development of coating technology.2K-WPU uses water as diluent,and its construction performance such as usability,pot-life and construction tolerance are still far from solvent-borne coating.With the rapid development of "oil-to-water" industrial coatings,the construction performance of 2K-WPU will attract widespread attention.This paper studies the influence of 2K-WPU coating formulation composition and construction process on construction performance,gives the impact of construction performance and adjustment methods,and prepares a high construction performance 2K-WPU for construction machinery.The experimental results show that: by adjusting the hydroxy functional polyacrylic dispersion,isocyanate curing agent,co-solvent and additives in the coating formulation,control the water mixing ratio and temperature and humidity during the construction process,prepared a 2K-WPU with excellent mechanical,chemical resistance and construction performance.Its construction viscosity is easy to adjust.In a wide range of viscosity(500 ? 2500mpa·s),the coating has good leveling property,excellent decorativeness,20 ° gloss up to 86.0,and pot-life increased from 3-4 hours to 5-6 hours,which is less affected by temperature and humidity.The construction conditions are increased from 20?30? and 50?70% humidity to 15?40? and 30?70% humidity.The film has high crosslinking degree and density,good chemical resistance,excellent mechanical properties,and outstanding abrasion resistance.