Flame retardancy of ammonium polyphosphate-chitosan/boron nitride on plywood surface via layer-by-layer self-assembly method
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摘要: 以杨木胶合板为研究对象,以聚磷酸铵-壳聚糖/氮化硼(APP-CS/BN)为阻燃涂层,通过层层自组装的方法将涂层整理到杨木胶合板上,以赋予胶合板一定的阻燃性能。FTIR和SEM结果显示,APP-CS/BN涂层在胶合板表面组装形成膜结构,组装膜均匀分布在材料表面。锥型量热仪(CONE)燃烧测试表明,与未经处理的胶合板相比,APP-CS/BN自组装涂层能有效延长胶合板点燃时间(TTI),降低胶合板的热释放速率(HRR)和总热释放量(THR),同时增加材料燃烧后成炭量。随着自组装涂层层数的增加,15层处理材、20层处理材、25层处理材的点燃时间较未处理材分别提升了100%、105%和125%;热释放速率峰值(Pk-HRR)较未处理材分别降低10.15%、22.34%和31.82%;阻燃处理杨木胶合板的THR,较未处理材分别降低2.89%、13.68%和15.32%;未处理材、15层处理材、20层处理材、25层处理材燃烧后成炭率依次为18.55%、24.07%、26.04%和27.65%。随着自组装层数的增加,杨木胶合板的阻燃性能随之增加,但当自组装层数由20层至25层时,胶合板阻燃能力提升的幅度变缓慢。本研究中,阻燃胶合板适宜自组装涂层数为20-25层。Abstract: In order to endow poplar plywood with certain flame retardant properties, ammonium polyphosphate-chitosan/boron nitride (APP-CS/BN) were choosed as the flame retardant coatings, and were deposited on the plywood through layer by layer self-assembly method. The results of FTIR and SEM show that APP-CS/BN coatings are assembled on the surface of plywood to form a membrane structure, and the assembled membranes are evenly distributed on the surface of the material. Cone calorimeter (CONE) combustion tests show that APP-CS/BN self-assembled coatings effectively prolong the ignition time (TTI), reduce the heat release rate (HRR) and total heat release (THR) of the plywood, while increase the char residue which formed after combustion of the material. Compared to untreated plywoods, the ignition time of self-assembled plywoods with 15, 20, 25 APP-CS/BN layers increase by 100%, 105% and 125%, respectively; Pk-HRR is decreased by 10.15%, 22.34% and 31.82%; THR is decreased by 2.89%, 13.68% and 15.32%. The char formation rates of untreated plywood, self-assembled plywoods with 15, 20, 25 APP-CS/BN layers are 18.55%, 24.07%, 26.04% and 27.65%, respectively. In summary, the poplar plywood exhibits good flame retardant properties via layer-by-layer self-assembly flame retardant treatment. However, when the number of self-assembly layers is from 20 to 25, the increment amplitude of flame retardancy of plywood becomes slower. In this study, the suitable self-assembly coatings are 20-25 layers.
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Key words:
- ammonium polyphosphate /
- boron nitride /
- plywood /
- layer-by-layer self assembly /
- flame retardancy
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表 1 聚磷酸铵-壳聚糖/氮化硼(APP-CS/BN)自组装胶合板的层数和增重
Table 1. Self-assembled layers and weight gain of plywoods with ammonium polyphosphate-chitosan/ boron nitride (APP-CS/BN)
Samples Layer numbers Mass gain/wt% Control 0 0 APP-(CS/BN)-15 15 10.28 APP-(CS/BN)-20 20 13.83 APP-(CS/BN)-25 25 17.64 -
[1] 胡景娟, 程瑞香, 王清文, 等. 杨木胶合板阻燃处理工艺及燃烧性能[J]. 木材加工机械, 2008, 2:14-18. doi: 10.3969/j.issn.1001-036X.2008.02.005HU Jingjuan, CHENG Ruixiang, WANG Qingwen, et al. Fire retardant impregnating process and combustion properties of poplar plywood[J]. Wood Processing Machinery,2008,2:14-18(in Chinese). doi: 10.3969/j.issn.1001-036X.2008.02.005 [2] ZHAO G L, YU Z L. Recent research and development advances of wood science and technology in China: Impacts of funding support from national natural science foundation of China[J]. Wood Science & Technology,2016,50(1):193-215. [3] GU J W, ZHANG G C, DONG S L, et al. Study on preparation and fire-retardant mechanism analysis of intumescent flame-retardant coatings[J]. Surface and Coatings Technology,2007,201(18):7835-7841. doi: 10.1016/j.surfcoat.2007.03.020 [4] LIU Y Z, FU Y C, YU H P, et al. Process of in situ forming well-aligned zinc oxide nanorod arrays on wood substrate using a two-step bottom-up method[J]. Journal of Colloid and Interface Science,2013,407(10):116-121. [5] 刘迎涛, 李坚, 王清文. FRW阻燃桦木胶合板的性能研究[J]. 林产工业, 2004, 31(3):22-24. doi: 10.3969/j.issn.1001-5299.2004.03.006LIU Yingtao, LI Jian, WANG Qingwen. Study on the properties of FRW fire-retardant plywood of betula[J]. China Forest Products Industry,2004,31(3):22-24(in Chinese). doi: 10.3969/j.issn.1001-5299.2004.03.006 [6] 曾思华, 韦春, 刘红霞, 等. 剑麻纤维素微晶(壳聚糖/聚对苯乙烯磺酸钠)层层自组装及其复合材料的热性能和阻燃性能[J]. 高分子材料科学与工程, 2014, 30(7):76-79.ZENG Sihua, WEI Chun, LIU Hongxia, et al. Construction of sisal fiber cellulose microcrystal/chitosan/polystyrene sulfonatevia layer-by-layer assembly and flame retardant properties of the composites[J]. Polymer Materials Science and Engineering,2014,30(7):76-79(in Chinese). [7] TANG L, LI X, DU D, et al. Fabrication of multilayer films from regenerated cellulose and graphene oxide through layer-by-layer assembly[J]. Progress in Natural Science Materials International,2012,22(4):341-346. doi: 10.1016/j.pnsc.2012.06.005 [8] GERO D. Fuzzy nanoassemblies: Toward layered polymeric multicomposites[J]. Science,1997,277(5330):1232-1237. doi: 10.1126/science.277.5330.1232 [9] 黄孝华, 牛红超, 刘婵娟, 等. (壳聚糖-聚磷酸铵)/剑麻纤维素微晶层层自组装复合材料的热性能和阻燃性能[J]. 复合材料学报, 2020, 37(2):260-266.HUANG Xiaohua, NIU Hongchao, LIU Chanjuan, et al. Thermal and flame retardant properties of (chitosan-ammonium polyphosphate)/sisal fiber cellulose microcyrstal layer-by-layer self assembly composite[J]. Acta Materiae Composite Sinica,2020,37(2):260-266(in Chinese). [10] RENNECKAR S, ZHOU Y. Nanoscale coatings on wood: Polyelectrolyte adsorption and layer-by-layer assembled film formation[J]. ACS Applied Materials & Interfaces,2009,1(3):559-566. doi: 10.1021/am800119q [11] 张国正, 于海鹏, 刘一星. 木材表面组装PEI/纳米ZrO2/FAS复合薄膜及其性能[J]. 林业工程学报, 2017, 2(3):83-89.ZHANG Guozheng, YU Haipeng, LIU Yixing. Performances of PEI/nano-ZrO2/FAS composite coatings on wood surface via llayer-by-layer assemble method[J]. Journal of Forestry Engineering,2017,2(3):83-89(in Chinese). [12] LIN Z Y, RENNECKAR S. Nanocomposite-based lignocellulosic fibers 2: Layer-by-layer modification of wood fibers for reinforcement in thermoplastic composites[J]. Composites Part A: Applied Science and Manufacturing,2011,42(1):84-91. doi: 10.1016/j.compositesa.2010.10.011 [13] ISO. Rraction-to-fire tests-Heat relase smoke production and mass loss rate-Part 1: Heat relase rate (cone calorimeter method): ISO 5660-2002[S]. Geneva: ISO, 2002. [14] KANNAN K P, GEORGE T S, GURUK S S. Extraction, purification and characterization of chitosan from endophytic fungi isolated from medicinal plants[J]. World Journal of Science and Technology,2011,1(4):43-48. [15] 郜玉楠, 周历涛, 王静, 等. 壳聚糖/沸石分子筛复合吸附颗粒的制备与性能[J]. 复合材料学报, 2019, 36(3):701-707.GAO Yunan, ZHOU Litao, WANG Jing, et al. Preparation and performance of chitosan/zeolite molecular sieve composite adsorbed particles[J]. Acta Materiae Composite Sinica,2019,36(3):701-707(in Chinese). [16] WU G J, LI J M, CUI Y D, et al. Studies on the hardness of chitosan-polyvinyl alcohol hydrogel[J]. Materials Review,2006,20(5):139-141. [17] WENG Q H, WANG B J, WANG X B, et al. Highly water-soluble, porous, and biocompatible boron nitrides for anticancer drug delivery[J]. ACS Nano,2014,8(6):6123-6130. doi: 10.1021/nn5014808 [18] 李斌, 王建祺. 聚合物材料燃烧性和阻燃性的评价-锥型量热仪(CONE)法[J]. 高分子材料科学与工程, 1998(5):15-19. doi: 10.3321/j.issn:1000-7555.1998.05.004LI Bin, WANG Jianqi. Utilization of cone calorimeter for the appraisal of the flammability and flame retardancy of polymer materials[J]. Polymer Materials Science and Engineering,1998(5):15-19(in Chinese). doi: 10.3321/j.issn:1000-7555.1998.05.004 [19] MA X X, WU Y Z, ZHU H L. The fire-retardant properties of the melamine-modified urea-formaldehyde resins mixed with ammonium polyphosphate[J]. Journal of Wood Science,2013,59(5):419-425. doi: 10.1007/s10086-013-1350-6 [20] 张军, 纪奎江, 夏延致. 聚合物燃烧与阻燃技术[M]. 北京: 化学工业出版社, 2005.ZHANG Jun, JI Kuijiang, XIA Yanzhi. Polymer combustion and flame retardant technology[M]. Beijing: Chemical Industry Press, 2005(in Chinese). [21] 李坚, 王清文, 李淑君, 等. 用CONE法研究木材阻燃剂FRW的阻燃性能[J]. 林业科学, 2002, 38(5):108-114. doi: 10.3321/j.issn:1001-7488.2002.05.018LI Jian, WANG Qingwen, LI Shujun, et al. A Study on the flame retardancy of FRW fire retardant for wood by CONE calorimeter[J]. Scientia Silvae Sinicae,2002,38(5):108-114(in Chinese). doi: 10.3321/j.issn:1001-7488.2002.05.018 [22] 房轶群, 王清文, 宋永明, 等. 聚磷酸铵-淀粉对木粉/聚苯乙烯复合材料的阻燃作用[J]. 高分子材料科学与工程, 2008, 24(11):83-86. doi: 10.3321/j.issn:1000-7555.2008.11.022FANG Yiqun, WANG Qingwen, SONG Yongming, et al. The fire retardancy of wood flour/PS composites treated with APP-Starch[J]. Polymer Materials Science and Engineering,2008,24(11):83-86(in Chinese). doi: 10.3321/j.issn:1000-7555.2008.11.022 [23] 夏燎原, 胡云楚, 吴义强, 等. 介孔SiO2-APP复合阻燃剂的制备及其对木材的阻燃抑烟作用[J]. 中南林业科技大学学报, 2012, 32(1):9-13. doi: 10.3969/j.issn.1673-923X.2012.01.002XIA Liaoyuan, HU Yunchu, WU Yiqiang, et al. Preparation of mesoporous SiO2-APP composite flame retardant and effects of flame retardant and smoke suppression on wood[J]. Journal of the Central South University of Forestry and Technology,2012,32(1):9-13(in Chinese). doi: 10.3969/j.issn.1673-923X.2012.01.002 [24] YUAN L P, FENG S Y, HU Y C, et al. Effect of char sulfonic acid and ammonium polyphosphate on flame retardancy and thermal properties of epoxy resin and polyamide composites[J]. Journal of Fire Sciences,2017,35(6):521-534. doi: 10.1177/0734904117720121 [25] TIAN N N, WEN X, JIANG Z W, et al. Synergistic effect between a novel char forming agent and ammonium polyphosphate on flame retardancy and thermal properties of polypropylene[J]. Industrial and Engineering Chemistry Research,2013,52(32):10905-10915. doi: 10.1021/ie401058u