Volume concentration of pigments (SOP) it is the ratio of the volume of the pigment to the sum of the volumes of the pigment and the binder, expressed as a percentage.
How some properties of the coating change as the SOP increases?
As the SOP increases:
1) the covering ability of the coating increases;
2) the gloss of the coating decreases;
3) the expansion of the coating decreases;
4) cohesion of the coating increases;
5) the water vapor permeability of the coating decreases;
6) the water absorption capacity of the coating decreases.
Please explain the abbreviation KSOP.
The NRWR is understood as the critical volumetric concentration of pigments, expressed in percentage, tj. those at which the essential properties of the coating change negatively.
Please present changes in important properties of painting materials after reaching the NRWR
After reaching the critical volume concentration of the pigment:
1) the hiding power of the coating material no longer increases;
2) the gloss level of the coating no longer decreases;
3) the expansion of the coating no longer decreases;
4) the cohesion of the coating suddenly decreases significantly;
5) water vapor permeability suddenly increases again;
6) the water absorption capacity of the coating increases again significantly.
What pigments are not alkali resistant? Please describe the changes of these pigments after contact with lyes
The following pigments change color due to the action of alkalis: chrome yellow, chrome green, zinc yellow, zinc green, iron blue, manganese violet and various tarry pigments.
Chrome yellow turns red when exposed to lye.
Chrome green changes color to brown under the influence of lye.
Zinc yellow turns red when exposed to lye.
Zinc green under the influence of lye changes color to brown.
Iron blue turns brown when exposed to lye.
Manganese violet turns brown when exposed to lye.