不饱和酸结构对不饱和聚酯树脂固化行为的影响

通过IR分析了用顺酐和反酸与聚酯合成不饱和聚酯树脂的反应机理,讨论了二种树脂体系固化放热曲线不同的原因。     

菠萝废料提取液在盐酸介质中对A3钢缓蚀性能的研究

本文采用失重法研究菠萝皮、菠萝冠芽提取液(以下简称BLB,BLY)在盐酸溶液中对A3钢的缓蚀性能.实验表明,在50℃,5%HCl中,使用0.5%的BLB、BLY浓缩物(折合鲜汁15%),缓蚀率可达90%以上,缓蚀效率比莲藕汁、橙皮汁、葵树花穗汁等植物缓蚀剂高.BLB、BLY与甲醛、乌洛托品等缓蚀剂具有较好的协同效应.此外还用电化学方法对BLB缓蚀机理进行了初步探讨.     

多功能酸洗缓蚀剂缓蚀效果的研究

对威海翔宇环保科技股份有限公司研发的多功能酸洗缓蚀剂进行了盐酸酸洗、H_2SO_4酸洗、硝酸酸洗缓蚀实验,实验结果表明,多功能酸洗缓蚀剂在盐酸酸洗、H2SO4酸洗、硝酸酸洗过程中对碳钢、16mn钢都有很好的缓蚀效果,加药浓度不同,缓蚀效果不同。多功能酸洗缓蚀剂的加药浓度一般在3‰~5‰,10%的盐酸酸洗的缓蚀率可达到98.8%、10%的H_2SO_4酸洗的缓蚀率可达到99.8%、10%的硝酸酸洗的缓蚀率可达到77%以上。     

Use of a sex attractant and an inhibitor for monitoring winter moth and bruce spanworm populations

A single sex pherormone component was isolated from abdominal tip extracts of female Bruce spanworm.Operophtera bruceata (Hulst). This was identified as (Z,Z,Z)-1,3,6,9-nonadecatetraene by capillary gas chromatography (GC), electroantennography, and mass spectrometry. In addition, hexane extracts of female abdominal tips from Bruce spanworm and the winter moth.O. brumata L., were analyzed by GC coupled to an electroantennographic detector (GC-EAD). The extracts ofO. bruceata andO. brumata females elicited only a single response, at the same retention time, from antennae of their conspecific and reciprocal males. In field tests conducted in Saskatchewan, traps baited with the synthetic tetraene captured Bruce spanworm males. In tests carried out on Vancouver Island, British Columbia, where the two species coexist, both Bruce spanworm and winter moth males were captured. The attractancy of lures containing the synthetic pheromone alone and in combination with several structurally related analogs was field tested at both locations. One of these, an isomer of the natural pheromone, (E,Z,Z)-1,3,6,9-nonadecatetraene, inhibited the capture of Bruce spanworm males but had no effect upon the number of winter moth males which were taken. Thus, populations of these two very similar species can be distinguished by employing traps baited with pheromone ± the inhibitor. Coneorifice Hara traps were found useful for field trapping males of both species.Issued as NRCC No. 26107     

Phytotoxic properties of cnicin,a sesquiterpene lactone fromcentaurea maculosa (spotted knapweed)

Water and solvent extracts from the aerial tissues ofCentaurea maculosa, spotted knapweed, inhibited the root growth of lettuce. Column chromatography and lettuce bioassay of a chloroform extract led to the isolation of cnicin, a sesquiterpene lactone. Pure cnicin was bioassayed at 0, 1, 2, 4, 6, 8, and 10 mg/5 ml water with lettuce, created wheatgrass, bluebunch wheatgrass, rough fescue, western larch, lodgepole pine, and spotted knapweed. Germination was inhibited at one or more concentrations for all species except lodgepole pine and spotted knapweed. Growth, particularly of the roots, was retarded between 1 and 4 mg of cnicin. Lettuce, bluebunch wheatgrass, and spotted knapweed were inhibited significantly at all concentrations tested.     

咪唑啉对碳钢在弱酸性H2S溶液中的缓蚀作用

应用计算机控制的电位扫描法研究了油溶性咪唑啉类慢剂对碳钢在弱性性Ｈ２Ｓ水溶液中的缓蚀作用,并采用三参数拟合方法对阴阳极极化曲线进行拟合计算。     

苯胺类缓蚀剂的量子化学研究

用量子化学半经验计算方法CNDO/2程序,研究了苯胺类缓蚀剂的电子性质与缓蚀性能的关系。结果表明质子化的胺基是苯胺衍生物与金属作用的活性部位。提出了该类分子作为酸性介质中金属缓蚀剂在铁表面形成吸附膜的作用机理。     

HJ-20-2气相防锈剂在造船行业中的应用

考察了HJ－20－2气相防锈剂的溶解度,熔点,堆密度,实密度等物理化学性能,通过气相防锈甑别试验,气相防锈能力试验,封存试验评价了该气相防锈剂的作用性能,结果表明它是一种性能优良的对碳钢的阴极作用型气相防锈剂,对铜等有色金属也有一定的保护作用,采用密闭空间挥发减量试验考察了其气相挥发能力,介绍了HJ－20－2气相防锈剂在船舶压舱盖和舵叶非涂装防蚀保护的使用方法。     

Identification of the antibiotic phomalactone from the entomopathogenic fungusHirsutella thompsonii var.synnematosa

Dichloromethane extracts of culture broth from three strains of the entomopathogenic fungusHirsutella thompsonii var.synnematosa were toxic to two species of tephritid fruit fly and inhibited conidial germination in vitro in several other entomopathogenic fungi includingBeauveria bassiana, Tolypocladium spp., andMetarhizium anisopliae. A major metabolite, toxic to apple maggot,Rhagoletis pomonella, and inhibitory to conidial germination inB. bassiana, was isolated and identified as the antibiotic (+)-phomalactone, 6-(1-propenyl)-5,-6-dihydro-5-hydroxypyran-2-one. This is the first biologically active compound of low molecular weight isolated from the genusHirsutella.Mention of a commercial or proprietary product does not constitute an endorsement by the USDA.     

盐酸介质中脱氢松香基咪唑啉缓蚀剂对Q235钢缓蚀性研究

利用静态失重法测定了脱氢松香基咪唑啉系缓蚀剂在盐酸介质中Ｑ２３５碳钢的缓蚀速度和腐蚀效率。研究Ｑ２３５钢在盐酸介质中的腐蚀动力学特征,求出了腐蚀速度方程及相关动力学参数。结果表明,作为一种吸附型有机缓蚀剂,脱氢松香基咪唑啉在盐酸中对Ｑ２３５钢具有较强的缓蚀能力,且缓蚀效率随温度升高而增大。