Preparation and Characterization of Starch Active Interface Calcium Carbonate for Biodegration

Abstract

Calcium carbonate is so hard to be further developed in polymer applications because it is difficult to combine with other materials. Starch-coated calcium carbonate was prepared by using starch as the main modifier and sodium stearate and sodium hexametaphosphate as the auxiliary modifiers. Optimal modification conditions were tested by single factor experiment and orthogonal experiment optimization. Manifestation was evaluated with the help of Fourier infrared spectrometer (FT-IR) and laser particle size analyzer and other test instruments. Results showed that a starch film was successfully coated on the surface of calcium carbonate, and the edges and corners of the modified coated calcium carbonate were passivated, and the particles were rounded. The active interface calcium carbonate has a broad application prospect in the field of degradable biomaterials.

Modified ground calcium carbonate mineral powder using in asphalt concrete: modification mechanism characterization at macro and micro levels

“…Therefore, the surface modification of industrial GCC is necessary to change the physical and chemical properties, improve its compatibility and dispersion with the asphalt matrix, and enhance its interface bonding force with the organic matrix, thereby enhancing the comprehensive performance of asphalt concrete. Coupling agents, such as stearic acid or stearate, are widely used for the modification of GCC (Liang et al, 2018;Yu et al, 2020;Han et al, 2022), they can change the solution system, and then modify the surface of mineral filler. The hydrophilelipophile balance value of stearic acid/stearate is typically between 6 and 8, which means a strong wetting ability for the mineral filler.…”