Foam Dust Suppressant Based on Synergistic Coordination between Oxidized Starch-Gelatin Schiff Base Reaction and Multiple Hydrogen Bond Crosslinking

Abstract

Aiming at the problems of large dust production in various production processes of open-pit coal mine, insufficient water resistance, this research applied the network generated by Schiff base reaction between OS and GEL as the basis, and combined with PVA and CaCl2. This material solves the problem of poor dust suppression effect caused by the environment of open-pit coal mines. It was found that the starch alcohol hydroxyl group (-OH) was catalytically oxidized to carbonyl group, which endowed it with dynamic cross-linking and bonding ability, and a large number of amino groups contained in GEL attacked the carbon atoms of carbonyl group to form carbon-nitrogen double bonds, generating Schiff bases as the cross-linking network, which enhanced the water resistance of the polymers. The incorporation of PVA and CaCl2 enabled the molecules to form a multiple hydrogen-bonding cross-linking network, which improved the water-holding properties of the dust suppressants and the toughness of the dust suppressant film. The solidity of the bonding layer can achieve 85HA, and the efficiency of 20min wind erosion and rainfall resistance reached more than 96%. The foam half-life was improved by 29min. This research provides new ideas for the research of dust pollution in open-pit coal mines.

Keywords: Schiff base reaction, multiple cross-linking, dust pollution control, wetting mechanism, foam dust suppressant