RELATIONSHIPS BETWEEN COMPOSITION AND PERFORMANCE OF WAX-ROSIN EMULSION AS WATER-REPELLENT OF FIBREBOARD

Series of wax-rosin emulsion were prepared using polymeric surfactants designed for the emulsion, and the effects of structure of the surfactant and the mass ratio of wax and rosin on the properties of the emulsion were investigated. The results showed that stable wax-rosin emulsion could be prepared using mixture of polymeric surfactant and the low molecular surfactants(LS) of derivative of alkylbenzyl polyoxyethyene ether. The polymeric surfactant (HS) was made from styrene, acrylic acid and its derivative. The use of emulsion at the mass ratio 1:2 of wax and rosin could reduce the adsorbing-water expansion coefficient of fibreboard by 23.8% and increase the modulus of elasticity by 12.2% at dosage of 5 kg/m3. The composition of the surfactant and the mass ratios of wax and rosin influenced significantly the properties and performance of the wax-rosin emulsion.