共查询到20条相似文献，搜索用时 265 毫秒
1.
桑枝韧皮纤维制浆性能的研究 总被引：5，自引：0，他引：5
桑枝韧皮纤维采用碱性亚硫酸盐一蒽醌法制浆，其较合适的工艺条件为：总用碱量为１５％（ＮａＯＨ计），ＮａＯＨ用量为８％（ＮａＯＨ计），Ｎａ＿２ＳＯ＿３用量为１１％（Ｎａ＿２ＳＯ＿３计），蒽醌用量为０．０５％，液比为１：４．最高温度为１６５℃，升温时间２ｈ，保温时间为２．５ｈ；蒸煮粗浆得率为３１．９％，纸浆卡伯值为１４．３９．残余ＮａＯＨ为１．４４ｇ／Ｌ，残余Ｎａ＿２ＳＯ＿３为８．４９ｇ／Ｌ．该浆料采用Ａｐ两段漂白，其Ｈ＿２ＳＯ＿４用量为６％，Ｈ＿２Ｏ＿２用量为３％，浆料可漂至７３．７５％（ＳＢＤ）的白度，漂后细浆得率为２６．８％，α－纤维素含量为９０．７５％ 相似文献
2.
麦草爆破制浆漂白性能研究(英文) 总被引：2，自引：0，他引：2
本文就麦草浆漂白的性能进行了探讨，以期改善纸浆白度．Ｈ２Ｏ２漂白剂因漂白损失小、漂后白度稳定性好，从而常用于纸浆漂白，特别是高得率浆的漂白．为寻找Ｈ２Ｏ２的漂白规律，本文对Ｈ２Ｏ２漂白过程的影响因素进行了研究．漂白剂Ｈ２Ｏ２在水中电离生成ＯＯＨ－作为漂白的有效成分，其浓度的提高使反应顺利进行．因此增加Ｈ２Ｏ２用量将获得较好的漂白效果．Ｈ２Ｏ２在碱ｐＨ缓冲剂存在的环境中电离，将产生一个较稳定的ＯＯＨ－浓度，使漂白反应稳定．但是过高的ｐＨ值会导致Ｈ２Ｏ２分解，同时碱与浆中木素的反应生成新的发色基因，使纸浆白度下降．适当的温度会促使Ｈ２Ｏ２的电离，使漂白反应顺利进行．但温度过高则使Ｈ２Ｏ２分解，失去漂白作用．为消除重金属离子对Ｈ２Ｏ２的催化分解作用，加入了螯合剂．根据ＭｏｎｉｃａＬｕｎｄｑｕｉｓｔ的研究模型，本文对麦草爆破浆的Ｈ２Ｏ２漂白进行了研究，白度值可表示为ｄＷｄｔ＝ｋ［Ｈ２Ｏ２］０．２３４０［ＮａＯＨ］１．２６１９Ｗ－１．８１７６．公式表明：较高的Ｈ２Ｏ２浓度、ＮａＯＨ浓度及较少的发色因素对白度提高有利．从公式中还可看出在保证必需的Ｈ２Ｏ２用量的情况下，ｐＨ值的控制对白度的提高是一个关键因素．由于漂白反应 相似文献
3.
泡桐木材防变色处理配方优选试验研究 总被引：5，自引：0，他引：5
为防止泡桐材的变色降等，采用防变色剂、耐光剂、渗透剂组成的防桐木变色剂配方处理桐木板材，观察其对色度ａ＊、ｂ＊、色差ＤＥ＊、明度Ｌ＊的影响。通过正交试验选择最佳工艺参数。处理后的泡桐板材可达到出口一级品之指标，颜色纯洁，保持木材天然本色。 相似文献
4.
5.
酸雨对杨树木材性质的影响 总被引：5，自引：0，他引：5
受酸雨危害和未受酸雨危害的杨树木材性质的对比表明：酸雨对杨树生长和木材性质产生显著的影响。与未受危害的健康材相比,危害材的木素和戊聚糖含量相对升高３．７２％和１．４３％,而综纤维素的含量相对减少３．４５％,热水抽出热,苯－醇抽出物和１％ＮａＯＨ抽出物含量明显高于健康材。 相似文献
6.
7.
中国速生泡桐木材品质下降明显,由于速生泡桐木材深加工利用关键技术还没有解决,对其产业发展产生了不利影响,导致高端桐木家具市场出现拒用速生泡桐木材的现象。文中介绍了国内外泡桐资源状况,评述了目前主栽泡桐品系的木材密度、应用价值、色度等指标,指出不同类型市场对泡桐树种、材质的要求。研究分析了国内外泡桐木材市场,重点介绍了引领高端桐木家具的日本与中国、欧美等地区市场差异,在产品品质、制造工艺、桐木质量、密度、纹理、色泽等方面的不同要求;测算了不同区域所占市场份额,即国外占比85%、国内需求占比15%。建议加强我国速生泡桐加工利用研究,同时制定可持续发展对策,培育密度大、白度好、纹理美观的优质泡桐,以期解决低质桐木资源与高端市场需求不相适应的矛盾。 相似文献
8.
研究了生产阻燃耐水型桉树复合板材的木片处理工艺。结果表明;桉树木片可溶性物质对复合板的物理力学性能影响显著;木片处理的适宜工艺为：在常温常压下,分别用浓度０．２％ＮａＯＨ水溶液和浓度１０％￣１５％的水玻璃溶液各浸泡木片４８ｈ,处理后的木片生产阻燃耐水型复合板,其表面硬度,耐磨性,阻燃性,抗腐性和耐水性均显著地优于普通实木地板材料。 相似文献
9.
10.
11.
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
12.
In order to increase its hardness and gravity as well as dimension stability, the technology of hotcompressing on Paulownia wood was studied. The main factors of affecting the spring back of the compressed Paulownia samples were discussed. It was discovered that every factor in the experiment had obvious effects on wood hardness and dimension stability of compressed wood. When the MC (Moisture Content) of experimental specimens was 13.89%, it was useful to spray water on the surface of samples before hot pressing. The best resuit was the recovery of compression set could decrease from 90.69% of untreated wood to 45.51% of soaking specimens into PF (Phenol Formaldehyde) water solution. The hot pressing time was 8 min at 190 ℃. 相似文献
13.
In order to increase its hardness and gravity as well as dimension stability, the technology of hot-compressing onPaulownia wood was studied. The main factors of affecting the spring back of the compressedPaulownia samples were discussed. It was discovered that every factor in the experiment had obvious effects on wood hardness and dimension
stability of compressed wood. When the MC (Moisture Content) of experimental specimens was 13.89%, it was useful to spray
water on the surface of samples before hot pressing. The best result was the recovery of compression set could decrease from
90.69% of untreated wood to 45.51% of soaking specimens into PF (Phenol Formaldehyde) water solution. The hot pressing time
was 8 min at 190°C.
Responsible editor: Zhu Hong 相似文献
14.
The effects of molecular weight of PF resin on the deformation behaviour of NaClO2 treated resin-impregnated wood during compression were investigated. Blocks of Japanese cedar were subjected to 2% NaClO2 aqueous solution. This was repeated up to four times resulting in a weight loss of 28%. Treated and untreated samples were
impregnated with PF resin having different molecular weight. With increasing molecular weight, weight gain and volume gain
decreased for untreated PF resin-impregnated wood, while NaClO2 treated wood impregnated with high molecular weight PF resin showed almost double the weight gain compared to untreated condition.
NaClO2 treatment has shown considerable potential for high compression of PF resin-impregnated wood at lower pressing pressure regardless
of the molecular weight of the resin. Low to high molecular weight resin was shown to penetrate into NaClO2 treated wood as estimated by weight gain contributing to the plasticization of cell wall considerably and thus resulting
in cell wall collapse at low pressing pressure. The density of NaClO2 treated wood impregnated with high molecular weight resin attained a value of over 0.8 g/cm3 which is close to the density of untreated wood impregnated with low molecular weight resin. Such compressed wood exhibited
high dimensional stability after boiling for 3 h. Thus, the penetration of resin into wood contributes to highly compressed
dimensional stable resin-impregnated wood at low pressing pressure. 相似文献
15.
酚醛树脂对人工林杉木木材的浸注性及其改善的研究 总被引：15，自引：1，他引：15
研究了低分子量酚醛树脂对杉木木材的浸注性及树脂在木材内的分布状态，并对苯醇抽提前处理法、常压浸渍和真空浸注的效果进行了评价。无论抽提处理与否，常压浸渍的树脂水溶液充填率为理论最大浸注量的10％左右，而真空浸注可达到90％以上，真空浸注效果明显；无论是常压浸渍还是真空浸注，抽提处理后树脂的浸注性有很大改善，但常压浸渍的效果不是非常明显。软X射线解析样品纵向树脂分布状态结果表明：无论是否经过抽提处理，在常压浸渍的情况下，树脂主要分布在样品的端部，而经过真空浸注处理，树脂注入的深度增加，尤其经过抽提处理后树脂可达到样品中心。由此可见，抽提处理和真空浸注并用，使树脂的分布状态有很大改善。另外，抽提处理后样品之间树脂分布的差异也趋于减小，即树脂在样品间的分布状态也有改善。用实体显微镜观察树脂在木材细胞腔内的充填状况结果表明：沿着样品纵向从端部到中心树脂充填率呈下降趋势，而且抽提处理的充填率比未抽提处理的高。 相似文献
16.
杉木(日本柳杉)经醋酸水溶液处理后，重量减少。将处理前后柳杉木材在4℃下进行炭化，得到了木醋液、木焦油和木炭。与未处理材相比，处理材木醋液的收率增加，而木焦油和木炭的收率减少。处理液的醋酸浓度增加后，木醋液和木焦油的收率几乎不变，但木炭的收率稍微减少了。用毛细管气相色谱法对木醋液的成分进行了定量分析。与未处理材相比，处理材木醋液中糠醛(呋喃甲醛)及5-羟甲基糠醛的收量增加，而羧酸类、苯酚类、邻苯二酚、愈创木酚类及麦芽酚的收量几乎不变。当醋酸浓度从0增至3％时，糠醛的收量随着增加，但是当醋酸浓度从3％增至30％时，其收量却几乎不变。 相似文献
17.
Xiaoqian Wang Fang Wang Zhiming Yu Yang Zhang Chusheng Qi Lanxing Du 《Journal of Wood Science》2017,63(3):271-280
The use of multifunctional wood for decorative purpose has grown increasingly popular in recent years. In this study, fast-growing poplar wood was treated with dye (0.5%) and flame retardant (0, 10, 20, and 30%) simultaneously to enhance its visual characteristic and safety. The dynamic wettability and surface free energy of wood samples were studied using S-D wetting model and van Oss–Chaudhury–Good (vOCG) method, respectively. Dye uptake, drug load, color difference, and combustion performance were determined. The treated wood was also characterized by infrared spectroscopy, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. The results indicated that the proposed treatment yields favorable adhesive spreading and penetration ability at the wood surface. The surface free energy of treated wood was higher than that of untreated wood, and the dye uptake, drug load, color difference, and limited oxygen index all increased after the proposed combination treatment compared to dye-only treated wood. The results also indicated that the flame retardant reacted chemically with the wood as the dye and flame retardant molecules diffused into the cell cavity, wood vessel, and aperture. 相似文献
18.
Our previous paper showed tobacco stalks to posses the characteristics of a raw material for pulp and paper application. It contains the major biomass constituents and cell components common to wood species. In this study, preparation and characterization of tobacco stalk pulp by steam explosion (SE) pulping at two chemical pretreatments were attempted. Chemical pretreatment prior to SE pulping improved the brightness, yield, and strength properties of the resulting tobacco SE pulps in the order: 6% Na2SO3 + 1% NaOH > 6% Na2SO3 > control (untreated). The 6% Na2SO3 + 1% NaOH-impregnated tobacco stalks produced SE pulps of good fiber length distribution and considerable properties that compare well with pulps from other raw materials obtained from previous studies, and the nonimpregnated ones showed strength properties superior to those of their poplar counterpart. Prior to bleaching, pretreating the tobacco stalk SE pulps with two stages, 2% NaOH at 90°C, improved the initial pulp brightness by about 5 points. Two-stage 6% H2O2 bleaching gave a comparable effect with hypochlorite bleaching for both tobacco and poplar, giving a 29–34 brightness point increase for tobacco SE pulp and 61 for the poplar samples. The differences in the bleaching responses for untreated tobacco and poplar SE pulps were attributed to the differences in their lignin structure, as shown in the total yield of their respective nitrobenzene oxidation products and FT-IR spectra. Tobacco SE pulps contain more of the guaiacyl-type lignin and poplar the syringyl-type lignin.This paper was presented in part during the 1998 CORESTA (Cooperation Centre for Scientific Research Relative to Tobacco) Congress, Brighton, UK, October 1998 相似文献
19.
为了使中纤板板面具有更好的色泽,增加销量,文章就如何提高中纤板表面白度进行了试验性研究。采用以草酸、漂白粉、VBL型荧光增白剂、双氧水为主剂的处理配方分别用涂刷的方法对小样中纤板表面进行增白试验,通过测定和分析处理效果发现,草酸、双氧水是适合中纤板板面增白的处理剂,综合考虑处理结果,以及成本和环保要求等因素,最后确定H2O2（27．5％）、NaOH（5％）、Na2SiO3（5％）以适当比例混合和浓度为5％的草酸为最佳中纤板板面增白配方。最后采用喷雾法用最佳处理配方对大样中纤板进行增白试验。结果表明,采用这两个配方对中纤板表面进行喷雾增白处理,白度分别可提高42．6％和17．5％,处理成本分别为127．11元／m^3和38．35元／m^3。 相似文献
20.
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