共查询到19条相似文献，搜索用时 515 毫秒
1.
2.
5种实木复合地板木材表面润湿性研究 总被引：2，自引：0，他引：2
以表面接触角和表面自由能为评价指标,研究了杨木、红橡、色木、柚木和红檀5个树种的实木复合地板表板木材的表面润湿性.分析了5个树种的木材的密度、抽提物对表面润湿性的影响.结果表明:不同木材的表面润湿性和表面自由能差异较大,其中,杨木的润湿性最好,表面自由能为107.87 mN/m;色木的润湿性较好,表面自由能为60.57 mN/m;红橡的润湿性较差,表面自由能为47.98 mN/m;柚木和红檀的润湿性最差、表面自由能分别为36.09 mN/m和35.79 mN/m. 相似文献
3.
《森林与环境学报》2015,(3)
以水载铜基防腐剂季铵铜(ACQ)和铜唑(Cu Az)处理毛竹竹条,采用蒸馏水、二碘甲烷、甲酰胺3种参照液体,测定其在防腐处理竹材表面的接触角,并利用几何平均法计算处理材的表面自由能,探讨防腐处理对竹材表面润湿性的影响。结果表明,竹黄面的表面自由能略高于竹青面,但二者差异不显著(p0.05);ACQ与Cu Az处理材的表面自由能差异显著,ACQ处理材的表面自由能高于Cu Az处理材;与未处理材相比,经过防腐剂处理的竹材,大多数表面自由能有所增加,但是随着载药量升高呈现先上升后下降的趋势;当ACQ载药量达到5.2 kg·m-3,Cu Az达到2.2 kg·m-3,防腐处理材与对照样的表面自由能差异不显著。 相似文献
4.
运用超声空化作用处理漂白和炭化竹材以期提高竹材表面性能,提高胶黏剂在竹材表面上的浸润性,进而提高竹层积材的胶合剪切强度。分析了不同超声处理工艺对竹材表面粗糙度和表面润湿性的影响;测试分析了超声处理竹片制成的竹层积材的胶合剪切强度变化。结果表明:超声空化作用能够提高竹材表面粗糙度、降低酚醛树脂胶在竹材表面的接触角,提高酚醛树脂在竹材表面浸润性。超声工艺参数对竹层积材胶合剪切强度的影响程度由大到小依次是温度、功率、时间,竹层积材胶合剪切强度表明:相比较于未处理的竹层积材,经最优超声工艺处理后的漂白竹层积材胶合剪切强度提升18%,炭化竹层积材胶合剪切强度提升12.5%,说明超声提高了竹材表面粗糙度和表面润湿性进而增强了竹材与酚醛胶黏剂的机械耦合作用。总体来看,漂白竹材表面粗糙度大于炭化竹材、润湿性弱于炭化竹材,漂白竹层积材胶合剪切强度大于炭化竹层积材。 相似文献
5.
6.
7.
8.
【目的】为了克服竹材易霉变的缺陷,采用水性杀菌剂对竹材进行热浴改性处理,揭示了改性处理对竹材防霉及胶合性能的影响规律,为研发竹材高效防霉技术提供科学依据。【方法】采用水性异噻唑啉酮衍生物复合杀菌剂（MBI）、异噻唑啉酮衍生物与氨基甲酸酯衍生物复合杀菌剂（DIB）、硼砂硼酸混合物（BB）溶液对竹片进行热浴改性处理,系统研究了改性处理条件对竹材吸液率、失重率、淀粉含量、接触角、竹材防霉和胶合性能、有机杀菌剂循环热浴稳定性的影响规律。【结果】相较于25℃浸泡处理,杀菌剂热浴改性提升了竹材的吸液率、失重率、淀粉脱除率及防霉性能,且有机杀菌剂的防霉效率高于无机杀菌剂,其中DIB与MBI热浴处理竹材对黑曲霉与混合菌（桔青霉和绿色木霉）的防治效力均可达到100%。经杀菌剂热浴处理后,MBI和BB改性处理竹材的表面润湿性降低,胶合性能提升,DIB改性处理竹材的表面润湿性提升,胶合性能基本保持不变,表明杀菌剂热浴改性处理对竹材表面润湿性和胶合性能的影响与杀菌剂的种类相关。经过10次循环热浴处理后,DIB、MBI处理液的抑菌活性下降幅度均不超过30%,表明水性有机杀菌剂的热浴稳定性高。【结论】杀菌剂热浴改... 相似文献
9.
为了改善沙柳人造板的性能,提高其利用价值,扩大人造板应用范围.以沙柳为研究对象,用偶联剂改性沙柳材,研究了改性前后沙柳表面的接触角,进而推导出其表面自由能,获得沙柳材表面的润湿性;同时对改性前后的沙柳木粉进行结晶度和傅里叶变换红外光谱测定,分析其结晶区和官能团的变化.结果表明:偶联剂对沙柳改性后,沙柳材表面自由能降低,润湿性没有提高,且结晶区没有明显的变化. 相似文献
10.
竹材表面胶合性能 总被引：2，自引：0，他引：2
该文主要研究竹材表面胶合性能,重点探讨了竹材的热压压力、施胶量、竹龄、组坯方式、竹材的不同处理方式等因子对竹材胶合性能的影响,用电子扫描镜观察竹材胶层分布情况。研究结果表明:热压压力、施胶量、竹坯的组合方式对竹材的胶合强度有显著影响;未经处理的竹材表面的胶合性能优于高温和硼酸处理;竹材胶层的微观观察结果表明:在相同压力下,1度竹的胶层与竹材之间的有较大的缝隙存在,胶合面平整度低;其他龄竹竹材的胶层均未发现较大的缝隙,并且胶层表面相对平整,胶层在竹材表面最薄处只有10μm,最厚处在40~50μm之间;在15 kg.cm-2和20 kg.cm-2的压力下,基本上未见到胶层与竹材之间的缝隙,压力变化对胶层厚度没有显著影响,一般胶层厚度小于10μm。 相似文献
11.
The main objective of this research is to evaluate the wettability of the processed bamboo surfaces. The important surface energy and acid-base properties for processed bamboo have been estimated by using contact angle techniques. According to the results, the change of ages has a positive relation with the contact angles of water on processed bamboo. The contact angles were increased after the bamboo surface treated in high temperature condition and preservation. The different treat methods have a strong influence on acid-base energy component insurface of bamboo. Compared with pinewood, the surface of bamboo seems to be stronger in the acid-base energycontribution. 相似文献
12.
Effect of alkali treatment on wettability and thermal stability of individual bamboo fibers 总被引：1，自引：0，他引：1
Hong Chen Wenfu Zhang Xuehua Wang Hankun Wang Yan Wu Tuhua Zhong Benhua Fei 《Journal of Wood Science》2018,64(4):398-405
The aim of this study is to examine the wettability and thermal properties of individual bamboo fibers after alkali treatment. The individual bamboo fibers were treated by sodium hydroxide (NaOH) solution with varying concentrations (6, 8, 10, 15 and 25%) followed by freeze-drying treatment. The surface analysis of alkali-treated individual bamboo fibers was characterized by atomic force microscope. Water droplet on the individual fiber surface was observed with drop shaper analyzer and the contact angles on fiber surface were also measured. Thermal properties were further studied by thermogravimetric analysis. The results indicated that alkali treatment resulted in the increase in surface roughness of individual bamboo fibers. Alkali treatment with low NaOH concentration could enhance the wettability of treated individual bamboo fibers, and while the wettability was reduced with alkali treatment at high concentration (25%). Thermal analysis revealed that the onset of decomposition and the maximum decomposition were moved to higher temperature after alkali treatment at low NaOH concentrations (6, 8, and 10%), suggesting the improvement in the thermal stability of treated individual bamboo fibers, while the thermal stability was compromised after alkali treatment at higher concentrations (15 and 25%). 相似文献
13.
INTRODUCTIONSome scientists and specialists think that agriculturalresidues are the second forest resource in China.Straw boards use the agricultural residues, such aswheat straw, rice straw and so on, as main rawmaterial, which are one-year-growth plants and veryrich in China. Producing straw boards can increasewood resource and decrease consumption of wood(Zhou Dingguo, et al, 2000).Wetting is a term to describe what happens when aliquid meets with a solid surface. The surface contact… 相似文献
14.
采用滑动弧冷等离子体对竹条和圆竹筒进行处理,并将处理后的样品进行复合型防护药剂加压浸渍处理。采用质量增加率、平衡含水率、湿胀率以及竹条和竹筒的抗压强度等指标来考察防护药剂处理后对竹材性能的影响,并观察竹条和圆竹筒防护处理后的发霉情况。实验结果表明,竹条和圆竹筒表面在加压条件下对二羟甲基二羟乙基乙烯脲(2D树脂)+戊唑醇与丙环唑(PT)+碘代丙炔基氨基甲酸丁酯(IPBC)复合型树脂防护剂的渗透性和附着性得以提升,表现为竹条和圆竹筒经滑动弧冷等离子体和防护药剂加压浸渍处理后质量增加率提高,而平衡含水率和湿胀率下降。对竹条和圆竹筒的质量增加率、平衡含水率、湿胀率和抗压强度产生积极影响的顺序为:冷等离子体处理+加压浸渍防护药剂>加压浸渍防护药剂>未经任何处理的竹条和圆竹筒。此外,竹节的多少也对竹材的质量增加率、平衡含水率和湿胀率产生影响,影响顺序为:无节>单节>双节。处理后,竹条和圆竹筒具有优异的防霉特性,存放半年后,圆竹筒仍能保持原来的物理特征,竹条和圆竹筒表面和端部均无发霉、腐朽和开裂现象。 相似文献
15.
Kun-Tsung Lu 《Journal of Wood Science》2006,52(2):173-178
The poor adhesion of bamboo coatings is a serious issue in the bamboo industry. To develop a pretreatment method that improves
the adhesion of films and increases the economic value of bamboo products, a study of hydrogen peroxide treatment with solutions
of various pH (pH 4–9) on bamboo surfaces was conducted. Five-year-old ma bamboo (Dendrocalamus latiflorus Munro), and nitrocellulose lacquer were used in the study. Surface properties of the bamboo such as contact angle and color
were evaluated, and 180° peel strength and shear strength tests for measuring adhesion of films were conducted. The results
showed that the wettability of water droplets and the carbonyl group concentration on the bamboo surface were increased significantly
by alkaline (pH 8 and 9) hydrogen peroxide treatments. There was only minor color variation and the outer wax layer of bamboo
was etched to form additional recesses after hydrogen peroxide treatment. It was also found that all hydrogen peroxide treatments
improved the adhesion of bamboo coating; bamboo treated with hydrogen peroxide at pH 7 showed the greatest improvement. The
enhanced adhesion was attributed to the mechanical interlocking of the film on the treated bamboo rather than to surface activation. 相似文献
16.
《中国林业科技(英文版)》2009,(2)
In this study,plantation poplar wood was first impregnated by low molecular weight phenol-formaldehyde(PF) resin solution by vacuum-pressure process.And then the wettability of sanded and non-sanded radial and tangential sections from un-impregnated and impregnated poplar wood was tested respectively by the measurement of contact angles using different liquids.Finally,the surface free energy of different samples was estimated by the plot extrapolation method.The results showed that the wettability of woo... 相似文献
17.
Cao Jin-zhen Li Li-dan Liu Zhi College of Materials Science Engineering Beijing Forestry University Beijing P. R. China 《中国林学(英文版)》2005,7(4)
In this study, the contact angles of three different reference liquids (including distilled water, diiodomethane, and formamide) and PF resin on the surfaces of Chinese fir (Cunninghamia lanceolata) samples untreated or treated with different con- centrations of ACQ-D (ammoniacal copper quat Type D) solutions were measured. Then, the surface free energy was calculated by two approaches: acid-base approach and geometric mean approach. ACQ-D treatment caused higher contact angles and lower surface free energies at a retention level corresponding to the commodity treated wood products. When wood was treated with much higher concentrations of ACQ-D, the total surface free energy of wood would be higher than the untreated control. Acid-base/polar compo- nents related with the hydrogen bonding state in wood were considered to be responsible for the observed changes according to the applied approaches. The hydrophobic properties and also higher contact angles of PF resin drop on wood surfaces after ACQ-D treatment at a reasonable retention level confirms the changes on surface free energy. 相似文献
18.
Cao Jin-zhen Li Li-dan Liu Zhi 《中国林学(英文版)》2005,7(4):29-34
In this study, the contact angles of three different reference liquids （including distilled water, diiodomethane, and formamide） and PF resin on the surfaces of Chinese fir （Cunningharnia lanceolata） samples untreated or treated with different concentrations of ACQ-D （ammoniacal copper quat Type D） solutions were measured. Then, the surface free energy was calculated by two approaches： acid-base approach and geometric mean approach. ACQ-D treatment caused higher contact angles and lower surface free energies at a retention level corresponding to the commodity treated wood products. When wood was treated with much higher concentrations of ACQ-D, the total surface free energy of wood would be higher than the untreated control. Acid-base/polar components related with the hydrogen bonding state in wood were considered to be responsible for the observed changes according to the applied approaches. The hydrophobic properties and also higher contact angles of PF resin drop on wood surfaces after ACQ-D treatment at a reasonable retention level confirms the changes on surface free energy. 相似文献
19.
ZHANG Yang WANG Siqun .Tennessee Forest Products Center University of Tennessee Jacob Dr.Knoxville TN - USA .Nanjing Forestry University Nanjing P.R.China 《中国林业科技(英文版)》2006,5(2):7-10
INTRODUCTION The surface free energy reflects the wettability of wood strand and has a big influence on the bonding strength of wood strand composites. In the past there have been many papers concerned with it. Wetting is a term to describe what happens when a liquid contact with a solid surface. And the wood grain direction also affects the adhesive wetting process significantly (Shi et al. 2001). It is important to emphasize that the contact angle on wood surface is a phenomenological … 相似文献