Abstract
Phenolic resin base multi-branched high molecular weight nonionic surface active agents were synthesized to evaluate their effects on improving the fluidity of coal-water slurry (CWS). The following results were obtained:1) Surfactants prepared by addition reactions of ethylene oxide (EO) with phenol resin, parasecondarybutyl phenol resin, nonyl phenolic resin or dodecyl phenol rein improved the fluidity.2) Nonyl or dodecyl is preferable as a resin alkyl group, and the number of nuclei of either from 12 to 19 is adequate.3) The number of moles of added EO should be such that each side chain has a molecular weight of about 3, 000.4) The addition of an agent equal to 0.4% of the coal to meet the above conditions 2) and 3) results in a viscosity of Tatung coal CWS of 1, 200cp at a coal concentration of 70%.
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