纳米木聚糖处理对木材防腐性能的影响
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摘要
以玉米芯为原料,利用正交试验优化提取温度、碱浓度、固液比等制备木聚糖的工艺参数。以制备的木聚糖为研究对象,通过改进工艺,制备粒径较小、分子量较低的纳米木聚糖,并以其为防腐剂处理杨木试样,结果表明:木聚糖提取率影响因素的顺序为:提取温度>碱浓度>固液比,理想工艺参数为提取温度70℃,碱浓度10%,固液比为1∶7,最佳提取率为42.647%;纳米木聚糖的粒径随温度的上升而减小,在60℃条件下,得到纳米级木聚糖的粒径最小,为45.99 nm;试件的载药量随着纳米木聚糖浓度增加,呈现上升趋势;当纳米级木聚糖浓度为10%时,杨木质量损失率在7.63%左右,属于强耐腐级别。
This study used corn cob as raw material,and the process parameters of xylan were optimized by orthogonal experiment to optimize the extraction temperature, alkali concentration and solid liquid ratio. With the preparation of xylan as the research object, by improving the process, the nano-xylan with small diameter and low molecular weight were prepared, and the samples were treated by nano-xylan. The main findings indicated that the extraction temperature most strongly affected the extraction rate of xylose, followed by concentration, the lowest is solid liquid ratio. Ideal technological parameters for extraction temperature 70 ℃, 10% alkali concentration, solid-liquid ratio of 1∶7, the best extraction rate is 42.647%; Nano particle size decreases with temperature rise of xylan, under the condition of 60 ℃, get the minimum particle size of nanoscale xylan 45.99 nm. The drug-loading rate of the specimen increased with the increase of the concentration of nano materials. And when the concentration of nano-xylan was 10%, the loss rate of poplar mass was 7.63%, which was strongly resistant to decay.
This study used corn cob as raw material,and the process parameters of xylan were optimized by orthogonal experiment to optimize the extraction temperature, alkali concentration and solid liquid ratio. With the preparation of xylan as the research object, by improving the process, the nano-xylan with small diameter and low molecular weight were prepared, and the samples were treated by nano-xylan. The main findings indicated that the extraction temperature most strongly affected the extraction rate of xylose, followed by concentration, the lowest is solid liquid ratio. Ideal technological parameters for extraction temperature 70 ℃, 10% alkali concentration, solid-liquid ratio of 1∶7, the best extraction rate is 42.647%; Nano particle size decreases with temperature rise of xylan, under the condition of 60 ℃, get the minimum particle size of nanoscale xylan 45.99 nm. The drug-loading rate of the specimen increased with the increase of the concentration of nano materials. And when the concentration of nano-xylan was 10%, the loss rate of poplar mass was 7.63%, which was strongly resistant to decay.
引文
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[13]于丽丽,蔡杰,唐镇忠,等.防腐处理木材耐候性研究进展[J].林业机械与木工设备, 2017, 45(7):4-6,26.
[14]Liu H,Du Y M, Wang X H, et al. Chitosan kills bacteria through cell membrane damage[J].International Journal of Food Microbiology, 2004, 95:147-155.
[2]徐懿.桐油防腐处理原竹管材耐久性试验及力学性能试验研究[D].贵阳∶贵州大学, 2015.
[3]蔡梦可.花梨木类木材耐腐机理及其抽提液抑菌防腐性能研究[D].合肥:安徽农业大学, 2016.
[4]Nieto-Domínguez M, D Eugenio L, York-Durán M J, et al. Prebiotic effect of xylooligosaccharides produced from birchwoodxylan by a novel fungal GH11 xylanase[J]. Food Chemistry, 2017, 232:105-113.
[5]埃罗·斯子斯特勒姆(芬兰).木材化学[M].北京:中国林业出版社,1985.
[6]唐朝发,李岩,李春风,等.不同抗菌剂对浸渍薄木抗菌性能影响的研究[J].林产工业, 2015, 42(2):29-31.
[7]于丽丽,郑波,唐镇忠,等.纳米SiO2改性ACQ防腐处理材的制备及抗流失性研究[J].林产工业, 2016, 43(6):10-13.
[8]黄浪,王佳贺,袁海威,等.新型木材纳米防腐剂的抑菌性研究[J].林业科技, 2011, 36(6):26-29.
[9]Escudero V, JordáL, Sope?a-Torres S, et al. Alteration of cell wall xylan acetylation trigger defense responses that counterbalance the immune deficiencies of plants impaired in theβsubunit of the heterotrimeric G protein[J]. The Plant Journal, 2017,92:386-399.
[10]邸向辉.以印楝提取物为基质的木材防腐剂微囊制备及性能研究[D].哈尔滨:东北林业大学, 2014.
[11]李坚.木材保护学[M].哈尔滨:东北林业大学出版社, 1999:280-281.
[12]李权.香樟木材提取物的成分及其防腐机理的研究[D].福州:福建农林大学, 2014.
[13]于丽丽,蔡杰,唐镇忠,等.防腐处理木材耐候性研究进展[J].林业机械与木工设备, 2017, 45(7):4-6,26.
[14]Liu H,Du Y M, Wang X H, et al. Chitosan kills bacteria through cell membrane damage[J].International Journal of Food Microbiology, 2004, 95:147-155.