NOVEL NANO-DISPERSION FOR SEALERS AND PRIMERS Provides Excellent Penetration,Protection and Adhesion Promotion

摘要

Conventional emulsions are available in the market with particle sizes greater than 100 nm(140-200 nm),with several applications already consolidated in coatings.New nano-emulsions are being presented with particle diameter particularly below 70 nm.1 Below 30 nm,they are generally translucent or transparent because their particles are smaller than the wavelength of visible light.2 Nano-emulsions present a number of advantages compared to conventional systems.Some details can be found in the literature.13,4 One of the main advantages that we can attribute to nano-emulsions is the greater penetration and consolidation capacity,since smaller particles favor penetration and a larger number of particles increase the number of grafting sites.5 Archroma has developed a new terpolymer nano-emulsion called Mowilith~R LDM 2801 with particle size distribution in the range of 35-50 nm.The product has a glass transition temperature(Tg) of 5 °C,a minimum film forming temperature(MFFT) below 5 °C,dry matter content about 33%,with viscosity below 100 cP,which facilitates its penetration.Even so,a minimum dilution is recommended to increase product penetration.