Synergic flame-retardant effect of cellulose nanocrystals and magnesium hydroxide in polyurethane wood coating

IF 1.7 4区农林科学 Q2 MATERIALS SCIENCE, PAPER & WOOD Journal of Wood Chemistry and Technology Pub Date : 2022-06-17 DOI:10.1080/02773813.2022.2085748

Liangsong Cheng, Shaobo Ren, N. Brosse, Zehui Ju, Suxia Li, Xiaoning Lu

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引用次数: 3

Abstract

Abstract In this paper, a wood coating based on waterborne polyurethane (WPU)/nano-cellulose crystalline (CNC)/Magnesium hydroxide (MH) was prepared. Efficient dispersion of MH in WPU in presence of 5 wt% of CNCs was observed by biological microscope leading to a material with improved esthetic, thermal and fire-retardant properties and mechanical performance. By thermogravimetric analysis (TG/DTG) and comparison with WPU, the maximum weight loss rate (RTmax) of WPU/CNC/MH coating decreased dramatically from 13.2 to 6.63, and the residue increased sharply from 4.69% to 40.55%. The results of pyrolysis combustion flow calorimeter (PCFC) showed that the flame-retardant performance of the composite coating is also greatly improved, and the peak of heat rate release (pHRR) being reduced from 350 w/g to 121 w/g. When applied to the wood panels, according to the Limiting oxygen index (LOI) experiment, for MH < 40 wt%, the combustibility grade is B2 level (combustible material), whereas for MH > 40 wt% the grade is B1 level (flame retardant material).

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纤维素纳米晶与氢氧化镁在聚氨酯木器涂料中的协同阻燃作用

摘要以水性聚氨酯(WPU)/纳米纤维素晶体(CNC)/氢氧化镁(MH)为基材制备木器涂料。通过生物显微镜观察到，在5%的cnc存在下，MH在WPU中的有效分散导致材料具有更好的美学、热、阻燃性能和机械性能。通过热重分析(TG/DTG)和与WPU的比较，WPU/CNC/MH涂层的最大失重率(RTmax)从13.2急剧下降到6.63，残渣从4.69%急剧上升到40.55%。热解燃烧流量热仪(PCFC)结果表明，复合涂层的阻燃性能也得到了很大的提高，热速率释放峰(pHRR)从350 w/g降至121 w/g。应用于木板时，根据极限氧指数(LOI)实验，对于MH < 40 wt%，可燃性等级为B2级(可燃材料)，而对于MH < 40 wt%，可燃性等级为B1级(阻燃材料)。

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来源期刊

Journal of Wood Chemistry and Technology 工程技术-材料科学：纸与木材

CiteScore

3.70

自引率

20.00%

发文量

审稿时长

3 months

期刊介绍： The Journal of Wood Chemistry and Technology (JWCT) is focused on the rapid publication of research advances in the chemistry of bio-based materials and products, including all aspects of wood-based polymers, chemicals, materials, and technology. JWCT provides an international forum for researchers and manufacturers working in wood-based biopolymers and chemicals, synthesis and characterization, as well as the chemistry of biomass conversion and utilization. JWCT primarily publishes original research papers and communications, and occasionally invited review articles and special issues. Special issues must summarize and analyze state-of-the-art developments within the field of biomass chemistry, or be in tribute to the career of a distinguished researcher. If you wish to suggest a special issue for the Journal, please email the Editor-in-Chief a detailed proposal that includes the topic, a list of potential contributors, and a time-line.