共查询到19条相似文献，搜索用时 484 毫秒
1.
壳聚糖前处理提高木材表面染色效果的研究 总被引：12，自引：2，他引：10
本文采用壳聚糖对木材表面进行前处理后，然后按不同树种，同一染料和同一树种，不同染料两种方式进行染色试验。结果表明：不同树种壳聚糖处理与未处理材的染色效果相比，处理材染色均一，没有色斑，颜色浓深，木材纹理清晰，当采用酸性红Ｇ染色，处理材明度减小，色饱和度增加，色差和色相差变化均很大；同一树种的处理材用不同染料染色，效果不同，亮色系染料染色效果较暗色系染料好。 相似文献
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以杨木单板及其染色单板为试材,使用氙光衰减仪进行辐射试验,分析这两种单板的光变色规律及影响因素,并进行耐光性能评价。结果表明:杨木单板的光变色是木材本身;染色杨木单板的光变色是染料和木材共同作用的结果,影响其光变色的主要因素是染料的品种和结构。因此,杨木单板的光变色小于染色杨木单板,而染色杨木单板中酸性蓝染色单板光变色最显著。 相似文献
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方文彬 《中南林业科技大学学报(自然科学版)》1999,(3)
对用 Ｈ 液的 ４ 种不同时间处理与未处理的 ２５～３０ 年生 ５ 株苹果树木材的物理性质进行测试和统计分析．结果表明：木材密度处理材与未处理材之间差异显著;未处理材的木材全干干缩率、木材湿胀率与基本密度呈线性负相关,处理材的木材全干干缩率、木材湿胀率与基本密度多呈线性正相关;处理材的木材吸水率与基本密度呈线性负相关,未处理材的木材吸水率与基本密度呈线性正相关．经 １００℃温度 Ｈ 液处理能减小干缩比,对木材性质有一定的改善作用 相似文献
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活性染料对杨木单板染色耐光性影响的研究 总被引：1，自引：0，他引：1
采用活性染料、酸性染料和直接染料分别对杨木单板进行染色,分析并确定耐光性最佳的染料及此染料染色的最佳工艺参数。结果表明：活性染料染色杨木单板的耐光性最佳;确定出的最佳染色工艺参数为：染料浓度10g/L,染色时间2．5h,染色温度60℃,浴比20：1。这一研究结果为杨木单板仿制珍贵木材提供了理论依据和实际生产工艺参数。 相似文献
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采用目测和色差计两种方法,对柞木的耐光色牢度进行试验。结果表明,染色柞木的耐光色牢度等级要好于未染色的柞木;未染色木材在处理15 h之前色差变化较快,而15 h后变色趋于平衡;染色木材色差变化较未染色木材缓慢,约在处理40 h左右变色趋于平衡;色差目测结果与用△E*ab公式计算结果差别较大,但与用△E00公式计算结果较接近,△E00公式计算结果更符合目测结果。 相似文献
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采用乙醇处理、碱处理和热水处理三种方式对尾巨桉单板进行预处理,由正交试验确定最佳染色工艺并在最佳染色工艺条件下对预处理单板进行染色,然后对染色单板的着色性能、耐光色牢度及耐水色牢度进行测定。结果表明：正交试验确立的最佳染色工艺为染液温度70℃、染色处理时间45 m in和酸性蓝浓度0.2%,其中染液温度是影响染色效果的最主要因素;三种预处理方法能够提高尾巨桉单板的渗透性并对着色性能影响不大,同时会使染色处理材的耐光性小幅下降;三种预处理方式对染色材的耐水色牢度有较好的促进作用,其中热水处理最好,乙醇处理次之,而碱处理最差。 相似文献
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本研究采用适宜木材染色的大红GR和嫩黄G酸性染料,对人工速生树种-杨木的漂白单板和未漂白单板进行染色.测定染色单板染色前后的颜色,计算染色前后的色差,并分析杨木单板染色后材色变化规律.试验结果表明,不同染料染色单板的变色度Eab与材色指数呈现不同的关系:红色染料a值增加和L值降低对Eab影响大;黄色染料b值增加决定了Eab的变化. 相似文献
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Erik Larn y Sebastian Dantz Morten Eikenes Holger Militz 《Wood material science & engineering》2006,1(2):59-68
Chitosan is a biopolymer derived from chitin in crustacean shells. Over the past decade it has been studied as an environmentally benign wood-protecting agent. It is assumed to act as a fungi-stat against a wide range of fungi and even as a fungicide at higher concentrations. This study investigated the properties of wood treated with modified chitosan of different molecular weights. Scots pine (Pinus sylvestris L.) and beech (Fagus sylvatica L.) samples were impregnated with two chitosan solutions differing in their average molecular weights. The chitosan solutions were depolymerized by nitrous acid to one solution of high molecular weight and one solution of low molecular weight with a concentration of 5% (w/v). The results show changes in sorption properties, antifungal properties, fire-retardant properties and mechanical properties of modified chitosan-treated wood. Heat-modified, chitosan-treated wood showed similar properties to chitosan-treated wood, except for brownish coloration, enhanced hydrophobation, and slightly reduced antifungal and fire-retardant properties. The modulus of rupture and hardness showed little or no change. The modulus of elasticity of the heat-modified, chitosan-treated wood increased by 27% compared with untreated wood. 相似文献
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《Wood material science & engineering》2013,8(2):59-68
Abstract Chitosan is a biopolymer derived from chitin in crustacean shells. Over the past decade it has been studied as an environmentally benign wood-protecting agent. It is assumed to act as a fungi-stat against a wide range of fungi and even as a fungicide at higher concentrations. This study investigated the properties of wood treated with modified chitosan of different molecular weights. Scots pine (Pinus sylvestris L.) and beech (Fagus sylvatica L.) samples were impregnated with two chitosan solutions differing in their average molecular weights. The chitosan solutions were depolymerized by nitrous acid to one solution of high molecular weight and one solution of low molecular weight with a concentration of 5% (w/v). The results show changes in sorption properties, antifungal properties, fire-retardant properties and mechanical properties of modified chitosan-treated wood. Heat-modified, chitosan-treated wood showed similar properties to chitosan-treated wood, except for brownish coloration, enhanced hydrophobation, and slightly reduced antifungal and fire-retardant properties. The modulus of rupture and hardness showed little or no change. The modulus of elasticity of the heat-modified, chitosan-treated wood increased by 27% compared with untreated wood. 相似文献
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Chemical mechanism of fire retardance of boric acid on wood 总被引：5，自引：0，他引：5
It is commonly accepted that the fire retardant mechanism of boric acid is a physical mechanism achieved by the formation of a coating or protective layer on the wood surface at high temperature. Although a char-forming catalytic mechanism has been proposed by some researchers, little direct experimental support has been provided for such a chemical mechanism. In this paper, new experimental results using thermal analysis, cone calorimetry (CONE), and gas chromatography–Fourier transform infrared spectroscopy (GC–FTIR) analysis are presented and the fire retardant mechanism of boric acid on wood is discussed. Basswood was treated with boric acid, guanylurea phosphate (GUP), and GUP–boric acid. Treated wood was then analyzed by thermogravimetry (TG/DTG), differential thermal analysis (DTA), CONE, and GC–FTIR analysis. Thermogravimetry showed that the weight loss of basswood treated with boric acid was about three times that of untreated or GUP-treated wood at 165°C, a temperature at which GUP is stable. The DTA curve showed that boric acid treated basswood has an exothermal peak at 420°C, indicating the exothermal polymerization reaction of charring. CONE results showed that boric acid and GUP had a considerable synergistic fire retardant effect on wood. The GC–FTIR spectra indicated that compounds generated by boric acid treated wood are different than those generated by untreated wood. We conclude that boric acid catalyzes the dehydration and other oxygen-eliminating reactions of wood at a relatively low temperature (approximately 100–300°C) and may catalyze the isomerization of the newly formed polymeric materials by forming aromatic structures. This contributes partly to the effects of boric acid on promoting the charring and fire retardation of wood. The mechanism of the strong fire retardant synergism between boric acid and GUP is due to the different fire retardant mechanisms of boric acid and GUP and the different activation temperatures of these two chemicals.The Forest Products Laboratory is maintained in cooperation with the University of Wisconsin. This article was written and prepared by U.S. Government employees on official time, and it is therefore in the public domain and not subject to copyright. The use of trade or firm names in this publication is for reader information and does not imply endorsement by the U.S. Department of Agriculture of any product or service. 相似文献
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热处理是木材加工行业中常用的处理手段之一,可有效提升木材尺寸稳定性及具有防生物侵蚀能力,但在一定程度上也会降低木材的力学性能。热处理导致木材材性变化的根本原因是木材组分含量及其分子结构在热量作用下发生了变化。笔者探索了不同热处理温度下(150,165,180,195和210℃)桃花心木材的化学组分变化。结果表明:经热处理后,桃花心木中的抽提物含量显著降低;处理材的p H低于未处理木材,且随处理温度升高呈下降趋势;热处理后桃花心木缓冲容量降低,随处理温度升高,呈先下降后升高趋势;桃花心木半纤维素中的木糖、甘露糖、半乳糖及葡萄糖醛酸含量随处理温度升高逐渐降低,且半纤维素大分子结构被破坏;热处理会导致桃花心木细胞壁中木质素大分子结构发生破坏,且随热处理温度升高,桃花心木中木质素单元主要连接结构(β-O-4’芳基醚键)断裂程度增加。因此,探明热处理对桃花心木化学性质的影响,将为优化桃花心木热处理工艺及合理制定热处理木材加工利用方法提供科学依据。 相似文献
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Study of crystalline behavior of heat-treated wood cellulose during treatments in water 总被引：1，自引：0，他引：1
The crystalline behavior of heat-treated wood cellulose treated at 85% relative humidity (RH), in water, or boiled in water after heat treatment was investigated. The normal increased crystallinity was significantly depressed for samples that were oven-dried and then treated in 85% RH or in water. In the case of boiling-water treatment, a more pronounced increased in crystallinity was initially observed, which then decreased gradually. The crystallinity decreased more than untreated wood for samples that were heat treated for long periods and was slightly higher than the decreased crystallinity from the beginning of the above two treatments. On the other hand, no significant change in crystallinity was observed for samples of increased crystallinity or decreased crystallinity that were treated under high-moisture conditions, for all three treatments. The results show that the crystalline state of wood cellulose heat treated under oven dry or high-moisture conditions behave differently if treated in water after heat treatment. Results suggested that the mechanism of crystallization might be different for samples that are subjected to heat treatment under oven-dry and high-moisture conditions. 相似文献
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在氨水存在下,杨木经苯酚-甲醛低聚物浸渍改性后,尺寸稳定性有了较明显改善,力学性能也有所提高。随着氨水添加量的下降,试样的静曲强度呈单峰型变化,且较未改性的试样均有所提高。当氨水添加量为0.5mol时,改性杨木的综合性能最优,其中,静曲强度相对未改性的参比提高了约6.9%,20℃水泡24h的体积膨胀率相应下降了36.2%,其他性能也相应的有所提升。 相似文献
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利用锥形量热仪CONE对不同热处理工艺下的杨木燃烧行为进行研究。结果表明:热处理后杨木中亲水的羟基、羰基数量明显减少,大量半纤维素降解。木材试样从外部热源引燃到燃烧结束,出现两个主要放热峰。热处理后杨木引燃和燃烧过程的发烟量较大,且热处理杨木引燃时间更短。热处理材的热释放峰值pk-HRR、平均热释放速率av-HRR和总热释放量THR均低于未处理材,表明其燃烧强度低于未处理材。热处理杨木燃烧过程的总烟释放量TSP较未处理材有所增加,同时其引燃时间也有所缩短。因此,对用于家具和室内装饰的热处理木材,建议进行恰当的阻燃处理。 相似文献