Saldan R. Making of glutinous compositions for low toxic plywood on the basis of urea formaldehyde resins.

An object is a technological process of making plywood. A purpose is development of making low-toxic plywood in the case of glue compositions on the basis of urea-formaldehyde resin. Methods - gravity (gravimetric); potentialometric; physical; mechanical; randomizations, methods of mathematical statistics. Scientific novelty: possibility of replacement ammonium chloride on the effective harder (aluminum sulfate and ammonium persulfate) for urea-formaldehyde resins for making plywood; influence of different content of aluminum sulfate and ammonium persulfate on the properties of UF resin and plywood were set; compounding of new glue compositions on the basis of UF resin with use aluminum sulfate and ammonium per sulfate for making plywood which is characterized by low maintenance of free formaldehyde in UF glue and increase the shear strength of plywood and an increase a selection from it of free formaldehyde were developed; regressive dependences of shear strength of plywood and selection from it of free formaldehyde from the parameters of the mode pressing (pressure, temperature and duration) which enable to get the rational mode parameters of pressing and prognoses shear strength of plywood and selection from it of free formaldehyde. Results: the glue compositions on the basis of UF resin, which are characterized by the lowered maintenance of free formaldehyde and enable to making low-toxic plywood were developed. Degree of introduction: the results of work are recommended for applying in industry of low-toxic plywood on the basis of proposes hardeners on enterprises: LTD. "ODEK-Ukraine"; LTD. "Kostopil'skiy the veneered factory"; LTD. "Yaz'm". Dissertation performances are used on LTD. "Yaz'm" during making of experimental party of plywood of 25 m3. Industry is woodworking.