ADHESIVE COMPOUND FOR PRODUCTION OF WOOD CHIPBOARD COMPOSITE MATERIALS

Currently, the chipboard production is a priority direction in the development of woodworking industry. In addition to purely technological aspects, the environmental safety of chipboard production is the most relevant, which is reflected in the modern patent, scientific and technical literature. One of the main ways to improve the environmental safety and efficiency of the chipboard production is a directed modification of urea-formaldehyde resin, the main binder, in order to significantly change the emission of free formaldehyde from finished structures. This problem is solved by modifying both the binder and the hardener. Ammonium chloride, oxalic acid, hydrochloric acid, ammonium silicofluoride, combined hardener in the composition of ammonium chloride and ammonia water and others are used as a hardener, and a polyacrylamide solution is used as resin modifier. The gas phase of wood chipboards aged at 1100 °C for 30 min was studied using a method of the vapor-phase gas chromatographic analysis with the mass spectrometer detection. Results show that polyacrylamide sample with modifying additives has the smallest quantity of components releasing in the gas phase. Concerning gas emission, all studied wood chipboard samples meet the sanitary rules for the use of polymeric materials in construction and furniture production and the sanitary and hygienic assessment of polymer and polymer-containing building materials and structures intended for use in the construction of residential, public and industrial buildings.

wood-shaving plates, composite material, modification, carbamideformaldehyde resin, adhesive compound

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