iHeir-TQ anti-mildew agent is widely used in the anti-mildew treatment of interior and exterior coatings, emulsion paints, water-based inks, color pastes and other fields.
iHeir-TQ has good compatibility with most water-soluble paints. When using, only 1%~2% (100kg paint plus 1-2kg anti-mold agent) of iHeir-TQ needs to be added to the paint, the paint will have good anti-mold performance. And it meets the requirements of GB 18582-2001 (limit of harmful substances in interior wall paints for indoor environmental protection decoration materials), which is free of formaldehyde and formaldehyde emitters.
The main surface defects of water-based coatings and their solutions
In order to reduce the environmental pollution caused by solvent release, water-based coatings are more and more widely used. Water-based paints can be divided into water-soluble paints and water-dispersed paints according to the relatively stable state of film-forming substances in water. Water-soluble coatings are divided into two types: self-drying or cross-linking curing coatings and electrodeposition coatings. Among the water-dispersed coatings, latex paints have the most varieties and the widest application range, including latex paints for construction, industrial latex, and automatic Electrodeposition paint, etc.
The sample containing polyamide wax, the sample containing polyether modified silicone
Sample containing enolate copolymer
Anti-sag effect diagram of several samples
1. The film-forming mechanism of water-based coatings and the causes of surface defects
In the construction process of water-based coatings, there are often coating film defects such as orange peel, brush marks, roll marks, shrinkage, shrinkage, floating color, flickering, and sagging. The related influencing factors are the surface tension of the coating and the criticality of the substrate. Surface tension, substrate roughness, coating viscosity and rheology, wet film thickness, wet edge time and drying time of the coating film, etc. The lower the surface tension of the coating, the thicker the coating, the longer the wetting time of the coating, and the higher the critical surface tension of the substrate, the better the wettability and leveling of the coating; the roughness of the substrate The lower the value, the better the smoothness of the coating film. It can be seen that water-based coatings have much in common with solvent-based coatings in terms of wetting, flow, leveling, and the causes of surface defects.
In addition, since the composition of water-based coatings is quite different from that of solvent-based coatings, there are also some differences. First of all, the surface tension of organic solvents in solvent-based coatings is much lower than that of film-forming polymers, and it is also much lower than the critical surface tension of the substrate (see Table 8-1 and Table 8-2), which can help the film-forming substance against the substrate. The surface tension of water is very large (about 73mN/m), which is far greater than the critical surface tension of the substrate. Therefore, the surface tension of water-based coatings is much higher than that of solvent-based coatings. That is to say, water-based coatings The wetting of the substrate is more difficult.
Leave a message
We’ll get back to you soon