Effect of Carboxymethylcellulose on the Properties of Magnesium Oxychloride Inorganic Plywood
In this paper,magnesium oxide and magnesium chloride aqueous solution were taken as the main raw materials,and carboxymethylcellulose was taken as the modifier,the magnesium oxychloride inorganic adhesive was prepared through a certain process,which was then used to prepare inorganic plywood.The mechanical properties and microscopic morphology of the obtained plywood were characterized.The results showed that carboxymethylcellulose could effectively prolong the flame retardant time of magnesium oxychloride inorganic plywood,and the flame retardant time of inorganic plywood increased to 546 s when the addition amount of carboxymethylcellulose was 2%.At this time,the mechanical properties of the resulting plywood reached the highest value,with the internal bonding strength increased to 0.56 MPa,the elastic modulus and static flexural strength increased to 11 548.6 MPa and 71.2 MPa,respectively,which increased by 105.6%and 35.9%,respectively,compared with the control group.When the addition amount of carboxymethylcellulose was 3%,the water resistance and flame retardant properties of the plywood were the worst,which was due to the hydrolysis of part of the 518 phase crystals in the magnesium oxychloride inorganic adhesive into Mg(OH)2.However,as the addition level continued to increase,the performance of plywood began to rebound due to the good film-forming and water-retaining properties of carboxymethylcellulose.
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