Solutions for mildew in architectural coatings

The weather in the south is relatively humid. The obvious impact on the home environment is the wall. If the wall is not waterproof or the quality of the decoration materials is not good, it will inevitably cause the coatings on the wall to become moldy and affect people's lives. For this reason, people have been trying to combat mould for a long time. 

In the past, people used lime water to paint walls, which had two main effects: sterilisation and decoration. This was the prototype of modern anti-mildew coatings. 

With the development of science, especially the rapid development of anti-mildew and fungicide production and technology, anti-mildew coatings have developed rapidly. Today's anti-mildew coatings are used in workshops such as cigarette factories, breweries and pharmaceutical factories with very harsh environments. For wall decoration, the coating is mould resistant and has a lifespan of more than several decades. The coating is beautiful, highly decorative and has low toxicity.

In the past two decades, China's anti-fungal coatings have developed rapidly, and the outstanding representative is Anhui i-Sourcing (Brand: iSuoChem). They provide necessary solutions for China's anti-mildew coatings and promote the development of anti-mildew coatings.

Formula Design of Anti-mildew Coating

Anti-mildew paints are composed of anti-mildew fungicides, binders（resins）, pigments, fillers and additives. The task of formulation design is to produce anti-mildew coatings that have both qualified anti-mildew and anti-algae properties as well as excellent decorative properties. 

Of course, they must also have sufficient storage stability and construction properties, as well as production operability, etc. . Nowadays, excellent anti-mildew coatings should have the basic properties of conventional architectural coatings, including non-toxicity, no unpleasant odour, pleasing colours and long-lasting effectiveness, making them environmentally friendly decorative functional paints.

The anti-mildew function of anti-mildew coatings is mainly achieved by anti-mildew fungicides. An ideal anti-mildew fungicide must be 

High efficiency: Kills or inhibits the growth of micro-organisms with a small amount of chemical.

2. Binders (Resins)

4. Additives

Summary

The formulations of waterborne anti-mildew coatings (paints) are listed in Table 1.

The basic process of producing an anti-mildew coating is shown in Table 2. 

Firstly, water and additives related to pigment dispersion are evenly mixed in a mixing tank. Solid water-soluble additives should be dissolved beforehand or at this stage. 

Next, the fungicide, pigments and fillers are added and stirred thoroughly to ensure complete wetting of the pigments and fillers. The mixture is then sent to dispersing equipment, such as a sand mill or three-roller mill, for grinding and QC checks the fineness. The resulting slurry is transferred to the paint mixing tank and additives such as base material, defoamer, film forming aid, rheology modifier and pH adjuster are further added and continuously stirred to produce a white anti-mildew coating. If a coloured paint is to be produced, the tinting slurry is added to the white coating to carry out the colouring process. 

Finally, the finished product is filtered and packaged. The products should be stored in a ventilated, dry warehouse away from sunlight, rain, heat sources and frost.