共查询到19条相似文献，搜索用时 188 毫秒
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ACQ和CuAz防腐处理对木材力学性能的影响 总被引：9，自引：2，他引：9
采用水溶性铜防腐剂(ACQ)和铜唑类防腐剂(CuAz)加压浸注处理臭冷杉木材,研究了药液处理浓度和后期干燥条件对木材抗弯弹性模量和抗弯强度的影响。t检验表明,本试验条件下,经两种防腐剂处理后,木材的抗弯弹性模量保持不变或略微增加。通过分析与对照素材试件的t检验比较,表明两种防腐剂处理前、后木材的抗弯弹性模量差异不显著。ACQ和CuAz防腐处理对木材抗弯强度有一定影响,ACQ处理使得木材抗弯强度整体上略有下降,而CuAz处理由于保持量相对较低,对木材抗弯强度未见明显下降趋势。后期干燥方式对木材抗弯强度亦未见明显规律性的影响。 相似文献
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EugeneOnyekweOnuorah 《林业研究》2002,13(3):183-190
本文调查了三种耐用木材(Afzelia africana J.E. Smith; Erythrophleum suaveolens (Guill & Perr.) Brenam. Syn. E guinensis G.Don. or Milicia excelsa (Welw) C.C. Berg. Syn. Chlorophora excelsa (Welw) Benth.)的心材提取物（在60%的甲醇中风干提取）和两种专用木材防腐剂（CCA和Penta）在暴露的土壤区组设计条件下，抑制三种木材腐朽菌(Coridopsis Polyzona Klotzch; Lenzites trabea; or Trametes cingulata Fr.)对见血封喉边材的侵袭的相对潜能，并测定其阈值。提取物和防腐剂的剂量分别是8.009、24.778、48.056、96.111、144.167 kg·m-3 ，样品的暴露处理时间与ASTM D1413-72规定的一致分别是14周和18周。结果显示：在阈值范围内，任何一种心材提取物或木材防腐剂在研究中对木材腐朽菌的抑制能力在0.01的显著水平下，差异显著。这些生物杀灭剂的相对功效是取决于真菌的种类。没有任何一种心材提取物或木材防腐剂（除在用最高的存留水平处理被侵袭的非洲毒箭木的条件下）对于被处理的木材能够授予"非常持久"等级。本土树种的心材提取物相对持久力的减少的可能原因是复杂的。在最高的存留量（144.167 kg·m-3）水平下，在0.05显著水平下每种心材提取物和任一种专用木材防腐剂（CCA和Penta）之间的功效差异不显著. 相似文献
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长白落叶松提取物对木材防腐作用的研究 总被引：3，自引：0，他引：3
以长白落叶松心材、边材及树皮为原料,分别用乙醚、氯仿、丙酮、甲醇和水5种溶剂对其进行提取,采用滤纸片法研究了不同溶剂提取物分别对白腐菌和褐腐菌的抑菌性能,发现心材的甲醇提取物和丙酮提取物对白腐菌有较好的抑制效果,树皮的水提取物对2种菌都有较好的抑制效果.并研究了这两种提取物在室内对木材的防腐性能,借助扫描电子显微镜(SEM)照片观察了木材腐朽后菌丝生长的情况,与常用木材防腐剂酸性铬酸铜(ACC)进行了对比,结果显示:心材的甲醇提取物对白腐菌的抑制效果较好;而树皮的水提取物对褐腐菌抑制效果较好. 相似文献
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文章研究了SGB硼浓缩液木材防腐剂对腐朽菌、白蚁和哺乳动物等生物的毒性,结果表明:SGB防腐剂处理材具有较好的抗白蚁性和耐腐性,该防腐剂对大白鼠的急性经口毒性为低毒级,SGB是适合用于喷涂使用的环保型木材防腐剂。 相似文献
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为探索木材生物防腐,以绿木霉（Trichoderma virens,NY45株系）为对象,研究其对木材白腐菌彩绒栓菌（Trametes versicolor,Tv）及褐腐菌密粘褶菌（Gloeophyllum trabeum,Gt）的抑制效果并探索抑制机理。结果表明：NY45对两种腐朽菌均有明显的抑制作用,经NY45孢子液处理的毛白杨木材,其耐腐等级从IV级（不耐腐）提升到I级（强耐腐）;NY45生长速度远快于木材腐朽菌,可以迅速抢占空间和竞争营养,并能寄生、覆盖、消解木材腐朽菌菌丝,其易挥发性物质对Tv和Gt抑制率分别为18.55%和45.69%,难挥发性代谢产物对两种木材腐朽菌的抑制率均超过90%。NY45有潜力作为木材腐朽生物防治菌进一步开发利用。 相似文献
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Sye Hee Ahn Sei Chang Oh In-Gyu Choi Ho-Yong Kim In Yang 《Journal of Wood Science》2008,54(6):495-501
As a substitute for high-cost copper azole (CuAz) and alkaline copper quaternary (ACQ) wood preservatives, alternative wood
preservatives were formulated with okara, which is an organic waste from the production of tofu, and copper chloride and/or
borax. Each preservative was used in treatment of wood blocks in a reduced-pressure method to measure its treatability. The
treated wood blocks were placed in hot water for 3 days to examine the stability of the preservatives against hot-water leaching.
The preservatives successfully penetrated into wood blocks, probably due to the use of ammonium hydroxide as a dissociating
agent. However, the stability of okara-based preservatives dropped as the concentration of acid in the solutions used for
hydrolysis of okara increased. The treatability and leachability of the preservatives were not affected by hydrolysis temperature
but were negatively affected by the addition of borax. Leached wood blocks treated with okara-based preservatives and exposed
to decay fungi Gloeophyllum trabeum and Postia placenta over 12 weeks showed good decay resistance. Okara-based wood preservatives can protect wood against fungal attack as effectively
as CuAz, and have potential for use as environmentally friendly wood preservatives. 相似文献
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G. S. Vermaak 《Southern Forests》2013,75(1):76-77
The performance of wooden louvres treated with four preservatives (Celcure A, copper sulfate + sodium pentachlorophenate, pentachlorophenol and Tanalith C) and exposed in a cooling tower in Pretoria is described. The copper-chrome-arsenate (CCA) preservatives Tanalith C and Celcure A (at retention of 30 kg/m3) protected the louvres very well against deterioration. Untreated Pinus canariensis wood outperformed P. pinaster and P. radiata wood. 相似文献
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“农村杨木木结构防腐”课题组 《林业科学》1989,25(2):139-146
我国北方农村的建筑用材,多以杨、柳、榆等速生树种为主,但这些木材易发生腐朽与虫蛀。本课题对适合农村建筑中杨木等木结构的防腐、防虫剂和防腐涂料的物理化学性能,对菌、虫毒效等进行了一系列的室内外试验,提出了简易的防腐防虫处理方法。在试验基础上,选用效果较好的水溶性、油溶性防腐、防虫剂和防腐油漆,并进一步在北京大兴县农村进行了扩大应用试验。经两年多观察,尚未发现虫蛀与腐朽,但未防腐的檩条已发生虫蛀。 相似文献
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铜-季铵盐复配木材防腐剂的防腐性能 总被引：7，自引：1，他引：7
在实验室内采用常规的真空－加压法浸注试件，土壤木块法进行防腐试验，检验了铜－季铵盐类防腐剂（FFJ－1、FFJ－2和FFJ－3）对白腐采绒革盖菌[Coriolus versicolor(L.ex Fr.)Quel.]和褐腐绵腐卧孔菌[Poria placenta(Fr.)Cooke.]的防腐性能，结果表明：在较低的保持量下，都有较好的防腐效果。与百菌清（可湿性粉剂）、五氯酚钠、三唑酮相比较，它们对白腐菌的防腐性能与百菌清相近，批五氯酚钠和三唑酮好。 相似文献
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S. Nami Kartal Christian Brischke Andreas O. Rapp Yuji Imamura 《Wood Science and Technology》2006,40(1):63-71
Evaluation of wood preservatives in soil-contact tests is becoming an important issue since detoxification of wood-protecting
compounds by fungi and bacteria found in soil may decrease the resistance of treated wood. In this study, the decay resistance
of wood treated with didecyl dimethyl ammonium tetrafluoroborate (DBF), a recently developed quaternary ammonia compound,
was evaluated in both soil bed and laboratory decay resistance tests. Small specimens (5×10×100 mm3) of DBF-treated and untreated sugi sapwood were subjected to decay in laboratory soil bed tests (DIN ENV 807 (2001)) followed
by Basidiomycetes tests (DIN EN 113 (1996)). Exposure in field soil and compost soil substrates was used to observe the effects
of wood degrading and other soil-inhabiting micro-organisms on the decay resistance of the specimens. Soil bed tests showed
that DBF-treated wood specimens at 7.7 kg/m3 retention level (1% DBF solution concentration) showed better performance compared to 0.01 and 0.1% DBF treatments. The 7.7 kg/m3 retention level was also effective to protect the wood specimens against Coniophora puteana and Coriolus versicolor in Basidiomycetes tests. It is concluded that detoxification of wood preservatives in soil contact is an important factor
to determine protective properties of treated wood in ground contact applications. Further experiments with larger specimens
are needed to observe the performance of DBF-treated wood at higher retention levels in field above ground and ground contact
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Dedicated to Prof. Dr. H.C. Mult. Walter Liese on the occasion of his 80th birthday. 相似文献
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J. A. Butcher 《Wood Science and Technology》1979,13(2):127-135
Summary The performance of copper-chrome-arsenate (CCA) and two quaternary ammonium compounds as wood preservatives was compared using a serial exposure technique, involving successive 10-week exposures in conventional soil jars. All preservative treatments were successful in preventing decay of Pinus radiata sapwood after the first exposure, but successive 10-week exposures clearly distinguished those treatments likely to offer long-term protection. The progressively increasing times of exposure with test fungi overcame the time lag for decay initiation in wood treated to preservative retentions above the toxic threshold established by conventional laboratory methods. Consequently, an additional and higher toxic threshold could be calculated. Examination of data from field stake tests suggested that a series of toxic thresholds established by a serial exposure technique could be related to preservative retentions which protect wood in the field from decay for increasing periods of time. Results of all tests are discussed in relation to the development of a laboratory procedure which may predict field performance of wood preservatives. 相似文献
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Summary Particle boards are of increasing economic importance. Without special treatment they are destroyed by termites. Deterioration of unprotected material as well as possibilities and present knowledge of preservation against termite attack are briefly described. Recent laboratory experiments with particle board treated to make it resistant to humidity and basidiomycete fungi showed that only one organic preservative out of four protected the boards also against termite attack; one of two water-soluble preservatives gave promising results. Heterotermes indicola (Wasmann) from India proved to be more aggressive and resistant to the preservatives than Coptotermes amanii (Sjöstedt) from Kenya and Nasutitermes nigriceps (Haldemann) from Guatemala. Kalotermes flavicollis (Fabr.) from Italy was also very tolerant to the fungicidal preservatives. Further development of treatments of particle board against termites is required.Part of this paper was prepared for the World Consultation on the Use of Wood in Housing, Vancouver, B. C., Canada, July 5–16, 1971. 相似文献
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Organic biocides as timber preservatives have aroused more and more attention,because metal salts especially arsenic,chrome and so on, have been suspected to be poisonous to the soil and aquatic animals,as well as the disposal of preserved timber wastes.Therefore,a number of effective organic biocides have been selected to prevent wood or bamboo from decay,mildew, stain and so on.Most of these products have entered into the market.With people’s increasing awareness of the environmental protection,organic biocides will eventually play important roles in timber preservation in the future.This paper summarized the studies on application of organic biocides as wood or bamboo preservatives,including resistant mechanisms,commonly applied types and effects against wood or bamboo fungi,approaches to detecting the amount of organic biocides in timber and their influences on the environment.Based on the discussion above,the authors predicted the developing prospect of organic biocides in timber preservation. 相似文献