Polyurethane honeycomb paper core composite board and preparation method thereof

Abstract

The invention relates to the field of paperboards, in particular to a polyurethane honeycomb paper core composite board and a preparation method thereof.Glass fiber layers are arranged on the upper surface and the lower surface of a corrugated paper core, and a pretreated paperboard is prepared; preparing foaming slurry from the modified polyurethane foaming emulsion and the composite hybridized lignin, then spraying the foaming slurry on the upper surface and the lower surface of the pretreated paperboard, and performing compression molding; nano-zinc oxide is generated on micron lignin in situ to prepare hybrid lignin, and a carboxyl-containing benzisothiazolinone derivative is esterified and grafted; according to the modified polyurethane foaming emulsion, phthalic anhydride polyester polyol, poly (neopentyl glycol adipate), epoxy resin E20 and isophorone diisocyanate are used as raw materials, dimethylolpropionic acid and 1, 4-butanediol are used as chain extenders, trihydroxymethyl phosphorus oxide is used as a cross-linking agent, a carboxyl-containing benzisothiazolinone derivative is used as an end-capping reagent, triethylamine is used as a neutralizer, and the modified polyurethane foaming emulsion is prepared through a hydrothermal method. Emulsifying to prepare a composite emulsion, and adding ammonium stearate into the composite emulsion as a foaming agent.

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