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研究了合成的除锈膏的除锈磷化作用,讨论了各种添加剂对除锈膏除锈能力、磷化作用及缓蚀效果的影响,并在化工设备维修中应用了除锈膏。 相似文献
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采用回流法以水提取巨尾桉叶中单宁,并对其缓蚀性能进行研究。静态失重缓蚀实验表明,在盐酸浓度0.8 mol/L,酸洗温度40℃,酸洗时间4 h条件下,单宁具有一定的缓蚀效果。当0.6 mg/mL单宁、0.4 mg/mL乙酸锌、0.6 mg/mL乌洛托品进行等体积复配时,缓蚀率提到93.05%。 相似文献
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以环氧氯丙烷、N-甲基吗啉和十二胺为原料,先后分两步反应,反应温度控制在40℃和80℃,反应时间为10 h和3 h,合成标题化合物,并对其杀菌缓蚀性能进行了研究。结果表明,所合成的双季铵盐在杀菌时间为8~12 h、投加浓度为70~100 mg/L时,杀菌率达90%以上,杀菌性能优于传统杀菌剂十二烷基二甲基苄基氯化铵(1227);具有对碳钢良好的缓蚀效果,缓蚀率达80%左右。 相似文献
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采用静态阻垢法和旋转挂片失重法评定了在高浓度钙离子水系统中的水处理剂的阻垢性能和缓蚀性能,并研究了栲胶与水处理剂复配后水处理剂的阻垢缓蚀性能。结果表明,PBTCA具有广泛高效的阻垢性能,可忍受较高的Ca2+浓度。栲胶与PBTCA、HPMA复配后在阻垢性能上具有良好的协同效应,当栲胶与PBTCA配比为3∶1时,阻垢缓蚀性能最佳。 相似文献
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植物单宁与溴丙炔反应制备的炔化单宁与对十二烷基苯磺酰叠氮通过点击反应合成单宁衍生物。采用红外光谱仪和元素分析仪对单宁衍生物的结构进行表征,并研究其表面张力、抗氧化能力以及对细菌的抑制作用等性能。结果表明,在单宁分子的结构中引入长链烷基后,改善其亲脂性,制备出的单宁衍生物能显著降低水溶液的表面张力,当单宁衍生物质量浓度为0.8mg/mL时,可降低水溶液的表面张力至28.94mN/m;单宁衍生物对1,1-二苯基-2-苦基苯肼基自由基具有较强的清除能力,当单宁衍生物质量浓度为0.25mg/mL时,对1,1-二苯基-2-苦基苯肼基自由基的最大清除率可达97.08%;由于单宁脂溶性的增加及具有抗菌性能的三氮唑基团的引入,单宁衍生物对大肠杆菌和金黄色葡萄球菌的抑制作用明显增强。 相似文献
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脱氢枞胺聚氧乙烯醚合成及其结构与性能关系研究 总被引:3,自引:0,他引:3
以酸-碱二步催化乙氧基化反应合成了一系列具有不同EO加合数的脱氢枞胺聚氧乙烯醚。对合成条件,产物表面化学性质,缓蚀性能及产品结构与性能关系进行了研究。实验结果表明,合成产品可作为非离子表面活性剂及金属缓蚀剂使用。 相似文献
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通过添加单宁和金属离子催化剂,对生漆进行改性制备复合涂料,研究金属离子种类、单宁添加量、反应时间、反应温度对单宁改性生漆复合涂料成膜性能的影响。研究结果表明,生漆中加入其质量1/5倍的20%FeCl3乙醇溶液反应40min后,再添加生漆质量8%的单宁,在60℃下反应3h得到的改性生漆成膜性能最佳,干燥时间缩短为52h,附着力为3~4级,耐冲击力为30kg/cm,硬度为2H。与原生漆相比,改性生漆耐碱性提高了3倍,耐受温度提高了2倍;红外光谱分析表明,生漆中的漆酚和单宁的酚羟基发生了醚化反应,从而改善了漆膜特性。 相似文献
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Comparison of the efficiency of inorganic nonmetal pigments with zinc powder in anticorrosion paints
This paper deals with the study of properties of anticorrosion pigments of varying chemical composition in epoxyester paints. Two type lines of paints were prepared. The first line comprised an anticorrosion pigment with a PVC concentration of 10% while the other line comprised an anticorrosion pigment with a PVC concentration = CPVC. The following nontoxic anticorrosion pigments were observed: zinc phosphate, zinc phosphomolybdate, calcium hydrogen phosphate, zinc phosphate modified with an organic corrosion inhibitor, strontium–aluminum polyphosphosilicate, zinc–aluminum polyphosphate, calcium metaborate, calcium ferrite, calcium borosolicate, and strontium chromate. The epoxyester primers were observed for the effect of the type of pigment on the anticorrosion properties. Anticorrosion efficiency was derived from tests in a condenser chamber and in a salt spray cabinet as well as from a test of chemical resistance of pigmented coatings. The evaluation of anticorrosion efficiency of inorganic nonmetal pigments was carried out by means of comparison with anticorrosion efficiency of metal dust. 相似文献
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Mangrove‐bark‐tannin adhesives are potential substitutes for phenol–formaldehyde (PF) wood‐bonding adhesives which are derived from petroleum, a finite natural resource. However, mangrove‐bark‐tannin adhesive exhibits poor adhesive properties, including brittleness, poor wet strength, and poor wood penetration. These shortcomings are due to its high reactivity and structural features. To reduce these shortcomings, the structure of the adhesive was modified by subjecting tannin to (a) caustic hydrolysis and (b) consecutive acetic anhydride and caustic hydrolysis. The effectiveness of these hydrolyses was determined by using differential scanning calorimetry (DSC) to monitor the reaction and cure characteristics of hydrolysed and unhydrolysed tannin with formaldehyde. These hydrolyses resulted in lowering both the activation energy and collision frequency of the cure reaction. Consequently, the initial reactivity of tannin towards paraformaldehyde, which was usually very high, was reduced. The resulting longer reaction time enhanced the extent of reaction, as was evident in the increase in heat of reaction of the hydrolysed tannin. © 2000 Society of Chemical Industry 相似文献
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杨梅单宁先与氯化亚砜反应制得氯代单宁,再与聚乙烯亚胺交联合成单宁基酚胺型螯合树脂。通过FTIR、SEM、EDS和XPS对单宁基酚胺型螯合树脂的结构进行表征,并考察了螯合树脂对Cr(VI)的吸附性能。在单宁的分子结构侧链引入氨基,能有效改善单宁基螯合树脂对Cr(VI)的吸附性能,螯合树脂对Cr(VI)的吸附主要为还原吸附,铬主要以Cr(III)的形式吸附到树脂上;在温度为318 K、pH为2.0、Cr(VI)初始质量浓度为500 mg/L时,单宁基酚胺型螯合树脂对Cr(VI)的最大吸附量达到364.46 mg/g;当Cr(VI)初始质量浓度低于20 mg/L时,树脂对铬的吸附率达到95%以上;单宁基酚胺型螯合树脂对Cr(VI)的吸附过程符合Langmuir等温吸附模型和准二级吸附动力学方程。该树脂在含铬废水处理方面具有潜在的应用前景。 相似文献