The role of wax emulsion in acrylic emulsion exterior paint

Water-based wax additive is one of the important additives for water-based coatings, providing anti-sticking, anti-friction, anti-scratch, adjusting gloss, anti-settling, hydrophobicity, polishing and other functions for the coating.

The common raw materials of water-based wax additives include paraffin wax, polyethylene wax, Fischer-Tropsch wax, montan wax, palm wax, microcrystalline wax, etc. It can be used alone or in combination, and its performance is different. Coupled with the change of emulsification formula and process, various brands and models of products are quite different, and they are special in coating additives.

In recent years, high-performance raw materials have been continuously introduced and localized; domestic manufacturers have developed from simply imitating foreign products to independent innovation for market demand; emulsification technology includes a large number of applications such as interface emulsification, low-energy emulsification, and micro-emulsification; high-shear emulsification machine , high pressure homogenizer and other new emulsification equipment research and promotion. In particular, the coatings industry continues to expand demand and improve requirements, and domestic water-based wax products have made a lot of progress.

The paraffin wax emulsion has low molecular weight, good crystallinity, strong non-polarity, and is easy to migrate to the surface of the coating to form a film. At the same time, the hydrophobicity of paraffin wax is the best in wax, and its physical properties are inert, which is harmless to the human body. Low, so paraffin emulsion has wide application potential in water-based coatings. But traditional paraffin emulsion has two major disadvantages:

1. The particle size is too large. In addition to the extinction effect on the gloss of the coating, the wax is prone to phase separation after melting beyond the melting point, causing the wax to precipitate and condense on the surface, resulting in the phenomenon of blooming.

2. In order to control the particle size of the emulsion, the excessive use of the emulsifier will cause the polarity and hydrophobicity of the wax to be destroyed, and the anti-sticking and hydrophobic effect of the coating will deteriorate.

The paraffin microemulsion is added to the acrylic emulsion exterior wall coating, and it is placed at 60 degrees for 4 hours after filming, and there is no surface blooming phenomenon after cooling. Such products have huge application potential in the fields of construction, paper products, textiles, and woodware.