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壳聚糖前处理染色木材耐光性的研究 总被引:9,自引:0,他引:9
对壳聚糖前处理与未处理(对照)染色木材耐光性的研究表明,山杨等6种壳聚糖处理与未处理木材用同一染料染色并辐射10小时后,处理材色差均比未处理材低;经壳聚糖前处理与未处理的安息香木才,用四种不同染料染色,染色材耐光性优于未处理材,但随染料种类不同略有差异。 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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壳聚糖处理对木材染色的助染效果及其机理的研究 总被引:8,自引:1,他引:8
采用酸性染料酸性橙Ⅱ对经壳聚糖处理的毛白杨原木木粉、苯醇抽提木粉以及木材主要组分进行染色,并用等物质的量的强碱、弱碱、强酸、弱酸以及水和有机溶剂处理相同质量经壳聚糖处理的原木木粉与壳聚糖染色试样,测定其助染效果和确定其助染机理。结果表明:壳聚糖处理能显著提高酸性染。料对毛白杨原木木粉、苯醇抽提木粉、纤维素、半纤维素和木质素的上染率,其助染机理是与木材组分结合的壳聚糖分子的氨基与酸性染料上的磺酸基以离子键结合,形成磺酸盐,从而提高了上染率。 相似文献
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木材结构特性对氧指数的影响 总被引:2,自引:0,他引:2
采用氧九法对4种树种木材、5种阻燃物质燃烧特性的研究发现,未阻燃木材的氧指数在纵横向上有差异性,纵向高于横向,径弦向差异很小。这主要是木材结构各向异性以及各方向上的导热系数不同所致。木材树种不同氧指数也有差异,原因之一密度不同所致。阻燃处理可使方向上的的差异逆转,即横向高于纵向。同一阻燃物质对不同树种木才的作用效果不同,即树料与阻燃物质之间存在适应性问题。树种铎氧指数有很大影响。 相似文献
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《林业工程学报》2016,(6)
以粉煤灰和壳聚糖为原料,采用微波辐射法制备粉煤灰/壳聚糖复合材料。通过单因素法和正交试验法考察了不同粉煤灰活化温度、壳聚糖和粉煤灰质量比、壳聚糖交联剂等条件下制备的复合材料对木材活性染料染色废水脱色率和CODCr去除率的影响,并用傅里叶红外光谱和扫描电镜对复合材料进行了表征。结果表明,当粉煤灰活化温度为250℃,壳聚糖与粉煤灰质量比为1∶25,用香草醛作为交联剂且加入量为壳聚糖质量的30%时,制备得到的粉煤灰/壳聚糖复合材料对木材活性染料染色废水的脱色率达858%,CODCr去除率达748%。粉煤灰和壳聚糖通过氢键结合形成复合材料可吸附废水中的染料。 相似文献
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染色木材pH值与缓冲容量的比较分析 总被引:1,自引:0,他引:1
分别用酸性染料与活性染料,对大青杨和桦木单板进行直接染色和NaOH溶液预处理后染色,测量2种染色单板的pH值和缓冲容量,并与未染色单板进行对比.结果表明,NaOH溶液预处理、酸性染料、活性染料的染色对2种单板的pH值及缓冲容量的影响规律一致;染色可小幅度增加木材pH值,显著降低酸缓冲容量;预处理则可较大幅度增加pH值,并一定程度上增加酸缓冲容量;大青杨单板经2种工艺染色后,其酸缓冲容量均有明显下降;桦木单板直接染色酸缓冲容量减小,而预处理后染色则酸缓冲容量增大. 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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壳聚糖处理木材表面的材色变化及对表面加工的影响 总被引:8,自引:0,他引:8
壳聚糖是一种无毒害且可再生的天然讷发子材料,可用于木才表面改性处理。本文通过对杉木边材、心材和毛白杨边材表面涂饰不同浓度的壳聚糖乙酸溶液,测定分析处理前后的木才材色变化。结果表明:不同深度壳聚糖处理木材表面,处理产后总体色差随深度的升高而增加,其它色度学参数略有变化;壳聚糖处理木材表面的最佳深度是2.0%,处理后对木才表面的进一步着色或涂饰无大影响。 相似文献
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This study evaluated wood color change (ΔE*) and the surface quality in 10 tropical wood species painted with three finishes (composed of wax and polyurethane). Two weathering conditions were tested: natural weathering (NW) and artificial weathering (AW). The results showed that the application of these finishes, decreased the luminosity (L*), increased the redness (a*) and the yellowness (b*) parameters in all species. ΔE*, after weathering exposure, was affected significantly by L*, a*, and b, whereas for finished or pretreated wood, L* and b* are the main parameters affecting ΔE* in the 10 tropical species studied. ΔE* values found in different finishes and pretreatments are cataloged as total change of color. Other important results were that tropical light colored timber with natural pretreatment produced higher ΔE* than dark colored timber. The stains and fungal development were observed in polyurethane finishes in NW, but not in AW. The irregular and mosaic flaws were not observed in any kind of finish or pretreatment of surface. The values of the quality index created, which considered long and short lines and switch flaws, were lowest in NW and in waxy finish, while the highest value was obtained with the polyurethane finish. 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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INTRODUCTION Wood is far from a stable material. One of the biggest challenges for woodworking is learning to work within the constraints of wood properties. Discoloration of wood directly influences the decorative performance of wood products. Therefore, the degree of color change is a critical factor that determines the utilization area of dyed wood (Sakuragawa Satoshi, 1996). Discoloration has occurred because the wood components and dye molecules are degraded by UV-ray (Kaneko Shin… 相似文献
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The effects of high temperature steam pretreatment on the change in wood moisture content (MC) and characteristics of vacuum drying were investigated in this study. Poplar and manchurian walnut woods were pretreated with high temperature steam at 100°C and 140°C, prior to vacuum drying. A comparison of the characteristics of vacuum drying between steam pretreated wood and untreated wood was carried out. The results show that during steam pretreatment, the MC of wood decreased within a few hours. The reduction of MC varied with the temperature; the higher the temperature, the faster the MC dropped. During the vacuum drying stage, the rates of drying of pretreated samples were higher than those of untreated samples when MC was below the fiber saturation point. Furthermore, the total drying time of samples treated at a steam temperature of 140°C was lower than that of untreated samples. Therefore, a vacuum procedure after steam pretreatment can effectively shorten the drying time when drying wood. 相似文献
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以杨木单板为基体,以热敏染料、显色剂、十四醇、增感剂为木材温致变色剂,利用超声波浸渍注入木材的方法制备可逆温致变色杨木单板,研究可逆温致变色杨木单板的浸渍工艺。结果表明:影响试件变色色差(ΔE*)的主要试验因子为超声波功率,方差分析其在0.01水平下对试件ΔE*影响显著;其次为浸渍时间和浸渍温度,方差分析二者在0.01水平下对试件ΔE*影响不显著。最佳浸渍工艺为浸渍温度75.0℃、浸渍时间4.0h、超声波功率120.0W。研制成可逆温致变色杨木单板新产品,杨木单板起始变色温度为26℃,终止变色温度为32℃;温度由26℃升至32℃时,试件由蓝色变成木材本色;温度由32℃降至26℃时,试件由木材本色变成蓝色,达到室温可逆变色的效果。 相似文献