Surface Properties and Thermal Stability of Modified Poplar Wood Combined NP Fire Retardant Pre-treatment with Heat Treatment
CHU Demiao
MU Jun
LAI Zongyuan
ZHANG Xinyu
Abstract：In order to improve the efficiency of heat treatment and the fireproofing of treated wood,nitrogen-phosphorus fire retardant(FR-NP) was used as an accelerating medium.The poplar(populusbeijingensis) wood samples were pre-impregnated by FR-NP and then heat treated at 120-160 ℃.Results show that surface decorating property of the modified poplar wood combined FR-NP pre-treatment with lowtemperature heat treatment(NP-Ht) is enhanced.The limiting oxygen index(LOI) value of NP-Ht wood is higher than 39.00％ and smoke density rating(SDR) is lower than 40.Meanwhile,the wood surface color of modified poplar wood combined FR-NP pre-treatment with 150 ℃ heat treatment(NP-Ht-150) is mostly close to that of poplar wood treated by 220 ℃ (Ht-220).Compared with that of Ht-220 wood,the surface hardness and bonding strength of NP-Ht-150 is improved by 34.15 ％ and 53.50％,respectively.The treating duration decreased by 75％.The FR-NP could accelerate the decomposition of wood chemical components during the low temperature heat treatment.However,the degradation degree of celluloses is lower than that of Ht-220 wood,the processes of low temperature heat treatment enhances the distribution of FR-NP in wood and the destruction level of the NP-Ht-150 wood cell wall is much lower than that of Ht220 wood.
Keywords：low-temperature heat treatmentfire retardancysurface brittlenessbonding strengthpoplar wood
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 931-936 )