Manufacture Process and Frost Resistance of Magnesium Oxysulfide Cement-Based Bagasse Board
Using untreated bagasse as raw material and magnesium oxysulfide cement as adhesive,a one-step forming method was used to manufacture magnesium oxysulfide cement-based bagasse board(MOCBB).The effects of oxygen sulfur ratio(the ratio of active magnesium oxide and magnesium sulfate heptahydrate),binder ratio(the mass ratio of magnesium oxysulfide cement and bagasse),hot pressing temperature,moisture content of raw materials,and types of additives(emulsified paraffin,aluminum hydroxide,and ammonium dihydrogen phosphate)on the properties of bagasse board were investigated.The results showed that under the conditions of an oxygen-sulfur ratio of 5,a binder ratio of 3∶7,a raw material moisture content of 20%,and a hot pressing temperature of 80℃,the density of the MOCBB was 0.86 g/cm3,the modulus of rupture was 16 MPa,the modulus of elasticity was 1 980 MPa,the internal bonding strength was 0.4 MPa,and the 2-hour water thickness swelling rate was 4.6%,which met the physical and mechanical performance requirements of the flame-retardant P2 type fire-retardant particleboard(flame-retardant furniture type particleboard used in the dry state)in GB/T 39032-2020""Difficult-flammable particleboard".The formaldehyde release classification met the ENF level requirements in GB/T 39600-2021"Formaldehyde emission grading for wood-based panel and finishing products".The combustion performance met the B1(B)flame retardant level in GB 8624-2012"Classification for burning behavior of building materials and products".Adding of ammonium dihydrogen phosphate as an additive effectively improves the surface frost resistance of MOCBB.
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