Effect of fire retardant additive on composite bonding quality and fire resistance

V raziskavi smo proučevali uporabo dodatka Burnblocka na kakovost izdelanih lesnih ploščnih kompozitov. Izdelovali smo furnirne in iverne plošče (različnih sestav) in njuni kombinaciji. Za lepljenje smo uporabili melamin – urea formaldehidno lepilo H97 (Melamin Kočevje). Pred izdelavo plošč smo gradnike s potapljanjem impregnirali v raztopini Burnblocka. Po potapljanju smo imeli suhi navzem 25–30 kg/m3. Ugotavljali smo fizikalne, mehanske in požarne lastnosti narejenih plošč. Ugotovili smo, da se je gostota pri ivernih ploščah nižala z naraščanjem deleža impregniranih iveri, pri furnirnih je bila zveza obratno-sorazmerna (več impregniranih furnirnih listov, višja gostota). Burnblock je slabo vplival na mehanske lastnosti ivernih plošč, pri furnirnih tega vpliva ni bilo mogoče zaznati. Predvidevamo, da je takšna odzivnost tudi posledica vpliva gostote na lastnosti plošč. Pri požarnih lastnostih je imel Burnblock pozitiven vpliv na izgubo mase. Pri iverni plošči s 50 % impregniranih iveri smo zmanjšali izgubo mase za več kot 10 %. Izmed vseh narejenih plošč smo na koncu izbrali najboljši. Pri ivernih ploščah je bila to iverna plošča s 50 % impregniranih iveri (IP 50), pri furnirnih ploščah je bila to devet-slojna plošča, kjer je sredica iz treh neimpregniranih furnirjev, ostali so impregnirani (FP E).In the research, we studied the effects of the use of Burnblock additive on the quality of wood-based panel. We determined the physical, mechanical and fire properties of the panels we made. We produced plywood and particle boards (various compositions) and their combination. Melamine – urea formaldehyde adhesive H97 (Melamine Kočevje) was used for gluing. Before making the boards, the wood particles were impregnated with Burnblock solution by immersion. After immersion, we had a dry intake of 25 – 30 kg/m3. After the tests, we found out that the density of particle boards decreased with increasing the share of impregnated wood particles, while the opposite was found for plywood (more impregnated sheets, higher density). Burnblock had a negative effect on the mechanical properties of particle boards, although in the case of plywood this was not noticeable, primarily due to the density. In terms of fire properties, Burnblock had a positive effect on weight loss. With 50% impregnated wood particles in the particleboard,the reduction of the weight was more than 10%. From all the panels made, we finally chose the best two. In the case of particle boards, it was a board with 50% impregnated wood particles (IP 50), and in the case of plywood, a nine-layer board, where the core is made of three unimpregnated veneers, while the rest are impregnated (FP E)