THE IMPACT OF NATURAL PIGMENTS ON THE AGGREGATIVE AND SEDIMENTATION STABILITY OF ALKYD-URETHANE SUSPENSIONS

Abstract

The influence of the amine derivative on the sedimentation and aggregate stability of particles of pigmented titanium dioxide and organic red in the alkyd-urethane filmforming was studied. It is established that amino derivatives in organic mineral spirit is a surface-active substance in a limited range of concentrations ( 0,4 g/dm3). Regardless of the type of pigment used, surfactant adsorption (in the Henry region) increases proportionally to the concentration of the amino derivative. The calculated values of activation energy indicate a chemisorption anchoring of the molecules TELAZ on the surface of titanium dioxide and organic red. It was found that the combined effect of the film-forming (SPL = 30%) and surfactant (spav = 0,001 mol/dm3) leads to an intensification of the processes of disaggregation of solid-phase particles of titanium dioxide. The absence of changes in the fractional composition of solid-phase particles of organic red in the presence of film-forming and surfactant was noted. It is proved that the maximum stabilizing effect of the amine derivative (minimum speed) in suspensions without film-forming falls on the concentration of 0,002 mol/dm3. Differences in sedimentation stability of suspensions with titanium dioxide and organic red are leveled in the region of high content of film-forming (SPL 30%). Found that in suspensions of titanium dioxide an amine derivative characterized by simultaneously dispersing and stabilizing effect, and in suspensions of organic red – stabilizing.

References

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