Abstract
Grinding aid chemicals which are used in the grinding of calcium carbonate (CaCO3) to prevent agglomeration are chemisorbed on the surfaces of particles, and the compatibility of them with the solvent, water, or organic resin affects the dispersion of the minerals and ultimately down-stream product properties in consumer industries such as paint, papermaking, and plastic. This study tries to explain the effects of triethanolamine (TEA) and monoethylene glycol (MEG), which are most commonly used as grinding aids, on the behavior of CaCO3 in water-based paints and on the properties of the paints. The powder properties of CaCO3 (grain size, color, surface area, oil absorption capacity, zeta potential, etc.) were characterized, and the changes in the can stability, ease of application, and optical properties (gloss, opacity) of the paints were revealed with rheological and optical analysis. It was observed that amine compounds remained in higher amounts on the CaCO3 surface and created negative results in the paint. On the other hand, glycol compound adhered less on the CaCO3 surface and affected the properties of the final product less than the amine compound. Therefore, CaCO3 ground without using any chemicals gives the best results in terms of long-term stability, ease of application, and visuality of the paint.
Highlights
In the cement and industrial mineral grinding technologies, liquid grinding aids are used to prevent the coating-effects on grinding media and mill equipment, agglomeration of fine particles, to increase the grinding performance, fineness of the product, and energy efficiency [1,2]
Different types and amounts of grinding aids affect the properties of the final products in which the ground particles are used as filler since they are chemisorbed on the fresh surface of particles created by the grinding [6]
The compatibility of the grinding aid grafted on the mineral surface with the solvent, water or organic resin will affect the dispersion of the minerals and down-stream product properties such as gloss, opacity, viscosity and storage stability in consumer industries such as paint, papermaking, and plastic [3,7]
Summary
In the cement and industrial mineral grinding technologies, liquid grinding aids are used to prevent the coating-effects on grinding media and mill equipment, agglomeration of fine particles, to increase the grinding performance, fineness of the product, and energy efficiency [1,2]. Monoethylene glycol (MEG), a polyol compatible with water and numerous organic compounds, contains non-dissociated and hydrophilic hydroxyl groups [3]. Studies involving molecular simulations have shown that the adsorption of grinding aids on the surface of the ground particles happens with their polar parts [4]. Different types and amounts of grinding aids affect the properties of the final products in which the ground particles are used as filler since they are chemisorbed on the fresh surface of particles created by the grinding [6]. The compatibility of the grinding aid grafted on the mineral surface with the solvent, water or organic resin will affect the dispersion of the minerals and down-stream product properties such as gloss, opacity, viscosity and storage stability in consumer industries such as paint, papermaking, and plastic [3,7]
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