FILLED-DENSITY WOOD CHIPBOARD WITH A LOWER FLAMMABILITY

The aim of our research was to increase the strength and water resistance of particleboard with improving their flammability properties. Commercially particleboards are usually exposed combustion, high water absorption and a relatively low strength. We have experimentally established that the addition 5–25 % microcrystalline cellulose with 10–40 micron and 5 % Na–CMC into the known composition of particleboard increases the density of products. Flexural strength, elasticity modulus, tensile strength across the sheet and swelling of particleboard passes through a maximum. To the maximum values of physical-mechanical indexes of the particleboards achieved with microcrystalline cellulose — 15 % and Na–CMC — 5 %. The results of analysis showed, increasing density of the particleboard samples to 790–880 kg
m3 , their physical-mechanical values achieves 0.35–0.40 MPa. In order to increase fireproof properties of the particleboard samples were studied on the selection of antipyrens. As an antipyren was selected phosphoric acid and ammonia. The total content of selected antipyrens not exceed 15 %. Thus, the purpose is performed by optimizing sequence and mode of processes, conditions for adding components of antipyren on the preparation of press-compositions. By the parameters and combustibility properties of the obtained samples of particleboard are assigned to the group of “slow-burning” materials to accordance with State standard 12.1.044–89.