Open AccessExperimental substantiation of method for increasing fire protection of wood composites with secondary polyethylene tereftalate
Author(s) -
I.A. Kudryashova,
T.N. Vakhnina,
A.A. Titunin
Publication year - 2021
Publication title -
lesnoj vestnik
Language(s) - English
Resource type - Journals
ISSN - 2542-1468
DOI - 10.18698/2542-1468-2021-3-118-125
Subject(s) - flammability , fire retardant , materials science , composite material , composite number , polyethylene terephthalate , polyethylene , wood plastic composite , pressing , fire resistance , swelling
The expediency of involvement of the waste in the production of composite materials in the form of secondary polyethylene terephthalate is shown. The results of the experimental researches for justification of technological regimes of production of wood-polymer composite possessing the required thermal and water resistance are presented. The way of its flammability reduction by means of introduction of fire retardant into the binder composition is offered. In the course of experimental studies on increasing fire protection of wood composites with the addition of secondary polyethylene terephthalate, mathematical models reflecting the relationship of controllable factors (specific pressing time, the share of flame retardant addition) and operational indicators of the composite (strength, water and fire resistance) were obtained. Statistical processing of the experimental results confirmed the homogeneity of dispersions of all output values and the adequacy of the obtained mathematical models of the wood composite production process. It was shown that 17 % aluminochromophosphate introduced into the composite at a specific pressing time of 0,53 min/mm ensures a water-resistant composite with the required bending strength and weight loss during the fire action, corresponding to the flammability class G1. It is concluded that a further increase in the specific pressing time is inexpedient because the strength of the wood-polymer composite decreases due to destructive phenomena caused by prolonged heating of the wood component, and the release of a vapor-gas mixture from the aluminochromophosphate. The reduction to a minimum of — 4,8 % of the swelling of the composite in thickness for 2 hours at such a pressing duration was established. The recommendations for technological parameters of the production process, providing obtaining of composite with polyethylene terephthalate additive with the necessary physical and mechanical indicators and reduced loss of mass during combustion were developed.