Causes of Tackiness in Antiviral Water-based Paint

In the Internet era, many consumers choose antiviral water-based paint to renovate their furniture. However, some customers encounter mutual adhesion between paint films, or between the paint film and packaging materials, accompanied by obvious changes on the film surface. What causes such tackiness? Let’s analyze it together.

1. Unsatisfactory drying conditions

The drying conditions of antiviral water-based paint must be properly set according to coating requirements. Heating methods used for solvent-based coatings cannot meet the drying needs of water-based paint. On the one hand, necessary dehumidification is required to maintain a constant temperature and humidity environment. On the other hand, proper ventilation is essential. Stagnant air easily causes the vapor pressure at the liquid-gas interface to reach saturation, slowing down normal moisture evaporation inside the coating film, resulting in poor drying and subsequent tackiness.

2. Paint film sensitive to heat and pressure

After drying, furniture coated with antiviral water-based paint is usually packaged. Direct stacking of workpieces under high storage temperature can lead to film tackiness. For one thing, antiviral water-based paint contains film-forming auxiliaries with high boiling points and slow volatilization. For another, the dry film of water-based paint is thermoplastic. When ambient temperature exceeds the glass transition temperature of the film, it softens, leaving pressure marks upon stacking. Proper stacking methods are therefore necessary.

3. Excessively thick single coating

Water is one of the main components of antiviral water-based paint. Its latent heat of vaporization is three to four times that of ordinary solvents, making it harder to volatilize. Moreover, after surface drying, the film may trap internal moisture, further slowing residual water evaporation and hindering normal drying.

4. Incomplete drying of the coating film

Drying of water-based paint involves complex physical and chemical processes, including volatilization of film-forming auxiliaries and water, diffusion and self-crosslinking of emulsion molecular chains, and chemical reactions of functional groups. It is also affected by many external factors. Thus, thoroughness of drying significantly impacts the anti-tack performance of water-based paint.

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