文献类型：期刊文献

中文题名：超临界二氧化碳流体预处理对木材单板染色性能的影响

英文题名：Effects of Supercritical CO_(2)Sluid Treatment on Dyeing Properties of Maple Veneers

作者：胡极航[1] 吕文华[1] 李黎[2] 郭洪武[2]

第一作者：胡极航

机构：[1]中国林业科学研究院木材工业研究所,北京100091;[2]北京林业大学

年份：2023

卷号：51

期号：6

起止页码：125-130

中文期刊名：东北林业大学学报

外文期刊名：Journal of Northeast Forestry University

收录：CSTPCD;;北大核心:【北大核心2020】；CSCD:【CSCD_E2023_2024】；

基金：中央级公益性科研院所基本科研业务费专项资金项目(CAFYBB2022MA001)。

语种：中文

中文关键词：北美糖槭;木材单板;染色性能;超临界CO_(2)流体

外文关键词：Acer saccharum Marsh;Veneer;Dyeing property;Supercritical CO_(2)fluid treatment

分类号：S781

摘要：以北美糖槭(Acer saccharum Marsh)刨切单板(长100 mm、宽30 mm、厚1 mm)为试材、超临界二氧化碳流体为萃取溶剂,采用3因素4水平的正交试验方案(L16(43)),试验分析萃取压力(20、30、40、50 MPa)、萃取温度(45、55、65、75℃)、萃取时间(30、45、60、75 min)对单板表面润湿性和染色性能的影响。测定试件表面接触角、色度学指数(L^(*)、a^(*)、b^(*))、染色前后的染液吸光度,计算单板表面色差(ΔE^(*))、上染率,分析不同处理条件时单板表面润湿性和染色性能的变化,遴选染色性能最佳的超临界二氧化碳流体预处理工艺参数;应用扫描电子显微镜、压汞仪、傅里叶红外光谱仪,测定分析处理前后单板微观形貌结构、大毛细管系统孔隙结构和化学基团的变化。结果表明:超临界二氧化碳流体处理后,北美糖槭单板表面润湿性与染色性能均有不同程度提高;上染率最优的处理工艺参数为压力50 MPa、温度45℃、时间75 min;表面色差最佳的处理工艺参数为压力40 MPa、温度45℃、时间60 min;与未处理单板相比,处理后单板木射线周围抽提物减少,且木纤维有一定程度降解,呈现大面积短链化结构;处理后单板比表面积和孔隙率增加,且平均孔径大于未处理单板;处理后单板的亲水性基团(羟基和羰基)增加;同未处理单板相比,超临界二氧化碳流体处理后单板表面润湿性提高45.23%、上染率提高75.41%、表面色差增加7.10%。
With Acer saccharum Marsh veneers of 100 mm×30 mm×1 mm as the test board,the effects of different pressure(20,30,40 and 50 MPa),temperature(45,55,65 and 75℃)and time(30,45,60 and 75 min)on the wettability and dyeing properties of maple veneers were studied by pretreatment with supercritical carbon dioxide fluid(SCF-CO_(2)),through an orthogonal test method(L 16(43)).The parameters of supercritical carbon dioxide fluid pretreatment process with optimal dyeing performance were obtained by measuring the surface contact angle,chromatographic indices(L^(*),a^(*),b^(*))and absorbance of the dye solution before and after dyeing of the specimen,calculating the surface color difference(ΔE^(*))and dyeing rate,analyzing the changes of surface wettability and dyeing performance under different treatment conditions;changes in the microscopic morphological structure,the pore structure of the macrocapillary system and chemical groups of the veneer before and after treatment were analyzed by scanning electron microscopy(SEM),mercury piezometer(MIP),and Fourier infrared spectroscopy(FTIR).The surface wettability and dyeing properties of maple veneers were improved by SCF-CO_(2)treatment.The treatment process parameters for optimal dyeing rate and surface color difference are:pressure 50 MPa,temperature 45℃,time 75 min,and pressure 40 MPa,temperature 45℃,time 60 min,respectively.Compared with untreated veneer,the radiation surrounding extract of veneer wood decreased,and the wood fiber degraded to a certain extent,presenting a large area of short chain structure.In addition,the specific surface area and porosity of treated maple veneer increases and the average pore diameter is larger than that of the untreated veneer.The hydrophilic groups of hydroxyl and carbonyl increased after treatment.Compared with the untreated veneer,the surface wettability,dye rate and color difference of the veneer treated with SCF-CO_(2)increased by 45.23%,75.41%and 7.10%,respectively.