杨木单板及其染色后的光变色研究

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。     

I-214杨染色单板光变色规律的研究

以染料弱酸深蓝5R和活性艳红X-3B染色的I-214杨素材和漂白板为试材,选用氙光作照射光源,考察不同染料、不同工艺条件下染色单板在110 h光照过程中试材表面材色指数,即明度指数(L*),色度指数(a*与b*)和变色度(△E* ab)的变化.结果表明:染色单板在110 h氙光照射过程中变色明显,b*值提高显著;△E* ab在光照初期大,后期平缓直到不变;同一品种染料,高浓度染液中染色单板比低浓度染液的光照变色大,浸染时间长短对染色单板光照变色影响不明显,先漂白再染色的单板材色均匀,光照变色平缓;不同品种染料的染色单板光照变色规律有差异.     

速生杨木染色-材色变化规律研究初探

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.     

染色杨木单板的耐光性影响因素研究

探讨了杨木染色漂白的最佳工艺参数及氢氧化钠浓度和耐光剂种类对染色杨木单板耐光性的影响。     

酸性和活性染料染色单板颜色耐光性比较

以椴木单板为研究对象,采用酸性染料和活性染料作为染色剂进行染色处理,并对染色处理后两种染料染色单板的颜色耐光性能进行比较分析,结果表明:单板活性染料染色最优工艺为:染料浓度0.5%、NaCl浓度1.5%、温度75℃;酸性染料染色最佳工艺为:染料浓度0.2%、NaCl浓度1.5%、温度70℃;活性染料染色单板的颜色耐光性能比酸性染料染色单板优异。     

活性染料对杨木单板染色耐光性影响的研究

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。     

纳米TiO_2改性涂料涂饰染色单板的光变色

利用纳米TiO2改性水性双组份聚氨脂清漆和丙烯酸清漆,将改性涂料直接涂饰染色单板并进行氙光辐射试验,探讨了纳米TiO2对染色单板光变色的抑制作用以及纳米TiO2加入量对光变色性的影响。结果表明,聚氨酯和丙烯酸清漆中纳米TiO2加入量分别为3%和5%时对染色单板光变色的抑制效果最佳。光辐射前后,涂饰改性与未改性聚氨酯清漆杨木染色单板的色差ΔEa*b分别为18.75、22.98,丙烯酸清漆的分别为11.75和16.98。改性涂料涂饰染色单板的光变色度小于未改性涂料染色单板,主要在于改性涂料能显著抑制染色单板红绿色品指数a*的变化。     

预处理对尾巨桉单板染色性能的影响

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。     

染色工艺对桉木单板上染率的影响探究

为改善桉树单板材色,用酸性橙为染色试剂对漂白弦切桉木单板进行染色,选取NaCl质量分数、酸性助剂质量分数、染料质量分数、染色温度和染色时间为工艺参数,进行桉木单板染色试验和上染率测定。结果表明:在本试验条件下,染料最佳质量分数为0.01%、NaCl最佳质量分数为0.2%、酸性助剂最佳质量分数为0.1%、最佳时间为4h、最佳染色温度的为70℃,此时,桉木单板的上染率最好。     

酸性和活性染料染色单板水洗牢固性比较

该文以杨木单板为研究对象,采用酸性和活性染料作为染色剂进行染色处理,并对染色处理后的杨木单板进行水洗处理;比较水洗处理前后两种染料染色单板的色差值发现,活性染料染色单板的颜色水洗牢固性能远优于酸性染料染色单板,从而肯定了活性染料应用于木材染色技术的优势及其实际意义。     

光辐射染色木材的变色规律及化学组分结构的变化

以I-214杨木染色单板为试材、氙光作为辐射光源,考察其在100h光照过程中表面颜色的变化规律;依据红外光谱图的谱峰位置和谱峰相对吸收强度,分析和确定光变色过程中染色杨木木材的化学组分。结果表明:染色杨木木材受光辐射易发生变色,其中酸性蓝染色单板的明度指数L*和色品指数b*变化显著,其光变色度显著大于酸性大红GR染色单板;若以波数1510cm-1为基准,非共轭羰基C=O振动的吸收峰(1738cm-1)吸收强度显著增强;共轭羰基C=O伸缩振动的吸收峰(1650cm-1)吸收强度有所增强;芳香环骨架C-C振动的吸收峰(1510cm-1)吸收强度明显减弱;C-O-H振动的吸收峰(1160～1052cm-1)吸收强度有所减弱。     

Dyeability of Chemically Treated Wood and its Discoloration by UV-ray Irradiation

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…     

染色木材pH值与缓冲容量的比较分析

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.     

Effects of surface modification methods on mechanical and interfacial properties of high-density polyethylene-bonded wood veneer composites

To improve interfacial adhesion between wood veneer and high-density polyethylene (HDPE) film, wood veneer was thermally modified in an oven or chemically modified by vinyltrimethoxysilane. The wood veneers were used to prepare plastic-bonded wood composites (PBWC) in a flat-press process using HDPE films as adhesives. The results showed that both modifications reduced veneer hydrophilicity and led to enhancement in shear strength, wood failure, and water resistance of the resulting PBWC. The thermal treatment significantly decreased the storage modulus close to 130 °C (the melting temperature of plastic). Thermal-treated wood veneer maintains mechanical interlocking for bonding and veneer strength which then declined under thermal treatment due to hemicellulose degradation and cellulose de-polymerization. In the silane-treated PBWC, enhanced interlocking and a stronger bonding structure resulted from the reaction between the silane-treated veneer and HDPE. This strong bonding structure allowed thermal stability improvement demonstrated by high modulus and low tanδ values. However, the strength of silane-treated PBWC was still much lower than thermosetting resin-bonded composites at higher temperatures due to the melting behavior of thermoplastic polymer, precluding its use in certain applications.     

分散染料对乙酰化橡木薄木染色的影响

为提高橡木的防腐耐久性,并赋予橡木美丽的色彩,首先对其进行乙酰化改性,然后分别用6种分散染料进行染色,探索染色温度、染色时间和染料用量,对乙酰化橡木染色和上染率的影响。结果表明,乙酰化橡木染色后的颜色与对应染料染色涤纶织物的颜色接近,实现了分散染料用于乙酰化改性橡木的染色,为彩色乙酰化橡木板材染色工艺参数确定提供参考。     

Eucalypt Wood Anatomical and Physical Properties and Their Effects on Plywood Veneer Quality

In order to better understand the reasons why eucalypt veneer checks easily and severely, wood samples of three eucalypt species were selected, and their anatomical and physical properties were examined according to conventional methods and the national standards. The effects of variances in cell wall thickness of wood fibre and vessel, and diameter of the cell lumen as well as the tissue ratio on the quality of plywood veneer were analysed. The results show that： 1） There is a great difference in fibre cell wall thickness and diameter of the cell lumen between early wood and late wood of Eucalyptus delegatensis. 2） E. obliqua has a high wood fibre tissue ratio and the thickest fibre cell wall, but the difference inthe fibre cell wall thickness between early wood and late wood is the smallest. 3） The wood fibre tissue ratio of E. regnans is smaller than that of E. obliqua, and its wood fibre cell wall isthe thinnest and there is only a very small difference in fibre cell wall thickness between early wood and late wood. The difference inthe diameter of wood fibre cell lumen among early wood, transition area and late wood is also small： 4） E. delegatensis has the highest tangential shrinkage rate and radial-tangential shrinkage rate, andE. obliqua has the lowest. It is the variability of wood anatomical properties of these species that cause the difference in the veneer shrinkagei and then affects plywood veneer quality.     

刨切薄竹贴面中密度纤维板工艺研究

对刨切薄竹贴面中密度纤维板(MDF)的工艺进行了研究,结果表明:在MDF的上下表面直接粘贴刨切薄竹的工艺可行,并根据试验结果确定了较优的贴面工艺参数.测试结果还显示,刨切薄竹背衬无纺布后再与MDF胶合,其表面胶合强度比刨切薄竹直接贴面MDF时低.     

竹胶合板——混凝土模板的构造与应用的研究

竹胶合板是我国最近开发的一种轻质、高强的代木材料。它的种类很多,其中用经纬编席坯板作胶合板的奇数间板,以帘吊内簧坯板作填层组合热压而成的毛竹经帘交压层积板,可以制作混凝土工程面板,以代替木材面板、钢面板以及其他材质面板。它既可与木材、钢材、工程塑料组成多种规格的模板体系;也可制成全竹胶普通模板。竹胶模板适应各种类型建筑工程的施工使用,安全轻便,装拆劳动强度小、工效高,施工经济效益好。