搜索结果: 16-30 共查到“知识库 木材防腐学”相关记录58条 . 查询时间(4.547 秒)
由脱氢枞胺与水杨醛制备脱氢枞胺水杨醛希夫碱(DAS),经硼氢化钠还原得到N-(邻羟基苯甲基)脱氢枞胺(DARS)。采用红外光谱、紫外光谱、 1H NMR 对DARS进行结构表征,并通过静态失重法、电化学方法考察DARS在盐酸溶液中对A3钢的缓蚀性能。结果表明,DARS含有仲胺官能团,在盐酸溶液中的溶解性和稳定性大于DAS,能较好地抑制盐酸对A3钢的腐蚀;在DARS用量为 0.005 %、温度为 4...
超声波辅助提取槐花总黄酮及其对酪氨酸酶的抑制作用
槐花总黄酮 超声波辅助提取 蘑菇酪氨酸酶 抑制作用
2012/8/3
利用超声波辅助从槐花中提取总黄酮,通过单因素和正交试验确定超声波辅助提取槐花中总黄酮的最佳工艺,并测定槐花提取物对蘑菇酪氨酸酶活性的影响。结果表明,最佳提取工艺条件为2.0g槐花粉,体积分数60%的乙醇40mL、提取温度80℃、超声波功率300W、提取时间30min,总黄酮得率(16.5±0.4)%。槐花提取物对蘑菇酪氨酸酶具有明显的抑制作用,抑制率达到50%时的质量浓度(IC50)为0.03g/...
新型水基防腐剂在木材中的固着机理研究进展
水基防腐剂 固着机理 氨/胺溶铜季铵盐(ACQ) 微化铜 硼
2012/8/3
对几种主要的水基木材防腐在木材中的固着机理进行了介绍。其中,在胺/氨铜防腐剂体系中,防腐剂中有效成分与木材实质间的反应主要为木质素及半纤维素中的羧基及羟基发生离子交换反应;在微化铜木材防腐剂体系(MCQ/MCA)中,防腐剂中有效成分通过高分子分散剂与木材纤维间较强的附着力固着在处理材中;而在硼类防腐剂体系中,防腐剂中有效成分的固着机理与铜比较相似,但硼酸盐无法直接固着在羧基及羟基中,因此有效成分的...
竹炭吸附对氨基苯酚的热力学及动力学研究
竹炭 吸附 对氨基苯酚(PPA) 热力学参数 动力学参数
2012/8/3
研究了竹炭吸附对氨基苯酚(PPA)的动力学和热力学参数。动力学实验表明:竹炭对PPA的吸附拟用准一级动力学处理,298K时的表观速率常数为5.08×10-4s-1,表观吸附活化能为19.6kJ/mol。热力学研究表明:竹炭对PPA酚的吸附符合Langmuir等温吸附方程。测得吸附热ΔH为-18.0kJ/mol,说明竹炭对PPA的吸附过程为放热过程,且ΔH＜20kJ/mol,表明吸附过程主要为物理吸...
采用气浮/混凝/水解酸化/接触氧化的组合工艺对生物柴油废水进行处理。实际运行结果表明,该工艺处理效果良好,耐强冲击负荷,出水水质稳定。气浮对油脂的去除率达85%以上,经混凝/水解酸化/接触氧化工艺处理后的出水各项污染物指标化学耗氧量(CODCr)、悬浮物(SS)、氨氮(NH3-N)和总磷(TP)等的去除率不低于90%,CODCr在80mg/L以下,达到《化学工业主要水污染物排放标准》(DB32/9...
金竹叶提取物的缓蚀性能研究
金竹 提取物 缓蚀剂 盐酸
2012/8/4
用失重法、动电位极化曲线、电化学阻抗谱(EIS)和原子力显微镜(AFM)研究了20℃时天然植物金竹叶提取物(PSLE)在1.0mol/L HCl溶液中对冷轧钢的缓蚀作用,并用吸附观点探讨了缓蚀作用机理。结果表明:PSLE对冷轧钢具有良好的缓蚀作用,质量浓度为100mg/L时缓蚀率高达94.2%。PSLE通过含O、N的极性官能团,在钢表面发生吸附起到缓蚀作用,且吸附规律符合Langmuir吸附等温式...
ADSORPTION OF COPPER-ETHANOLAMINE PRESERVATIVES IN WOOD
amines copper Fagus sylvatica Picea abies fixation in wood wood preservation XRF
2009/11/27
Copper-ethanolamine based preservatives are one of the most important wood preservatives for protection of wood in third and fourth use class. Despite the fact that they are commercially used for seve...
Influence of PVA emulsion on leaching of boron and copper from wood and efficacy on wood decay fungi
boron copper fixation Norway spruce PVA emulsion wood preservation
2009/11/27
Boron compounds are very effective fungicides, but they leach from wood in wet environments, unfortunately. In order to improve boron fixation, boric acid, borax and copper(II) sulphate were combined ...
Impregnability and leachability of copper based preservatives with regard to anatomical plane of wood
copper ethanolamine fixation impregnability penetration retention wood preservation
2009/11/27
Due to the limited use of classical copper/chromium based preservatives, the industry seeks for alternatives for preservation of wood in ground applications. For such purposes, fungicides fixed in woo...
LEACHING OF COPPER-ETHANOLAMINE BASED PRESERVATIVES FROM WOOD
wood preservation copper based preservatives amines ethanolamine fixation
2009/11/26
Copper-ethanolamine based preservatives are successfully replacing classical copper-chromium based preservative solutions. In this paper, the proposed
fixation mechanisms are described. Additiona...
Infection of CCB preserved and leached wood specimens with wood decay fungi
copper tolerance CCB wood wood decay fungi leaching boron overgrow respiration
2009/11/26
CCB treated wood is generally resistant to all wood decay fungi. However, like at CCA impregnated wood, susceptibility of CCB treated wood to copper tolerant fungi have been observed. It was investiga...
INFLUENCE OF DRYING TEMPERATURE ON PROPERTIES OF WOOD SURFACES
DRYING TEMPERATURE PROPERTIES OF WOOD SURFACES
2009/11/26
INFLUENCE OF DRYING TEMPERATURE ON PROPERTIES OF WOOD SURFACES。
COPPER TRANSLOCATION FROM PRESERVED WOOD EXPOSED TO WOOD DECAY FUNGI
COPPER TRANSLOCATION PRESERVED WOOD WOOD DECAY FUNGI
2009/11/26
COPPER TRANSLOCATION FROM PRESERVED WOOD EXPOSED TO WOOD DECAY FUNGI。
落叶松树皮乙醇提取物的抗氧化性能研究
落叶松树皮 抗氧化物质 总酚 原花青素
2012/8/9
以乙醇为提取剂对落叶松树皮进行两次提取,利用柱色谱对提取物进行分离并对提取物及分离后各组分进行总酚含量、原花青素含量测定,利用Fe3+还原力测定方法及DPPH法对其抗氧化能力进行测定。结果表明,第一次浸泡,提取物得率 13.68%,总酚占总提取物质量 58.60%,原花青素占总酚质量的 17.86%。第二次浸泡,提取物得率 11.91%,总酚占总提取物质量的 29.02%,原花青素占总酚质量的 1...