Structure, properties and application to water-soluble coatings of complex antimicrobial agent Ag-carboxymethyl chitosan-thiabendazole

The structure, properties and application to water-soluble coatings of a new complex antimicrobial agent Ag-carboxylmethyl citosan-thiabendazole （Ag-CMCTS-TBZ） prepared from different materiel ratios were reported. The silver ions were preferably coordinated with the free-NH2 groups and the -OH groups of secondary alcohol and carboxyl in CMCTS. TBZ preferably bonded to carboxyl group in CMCTS by electrostatic force and hydrogen bonding. Increase in silver ions content in the complex agent improved to some limited extent the antibacterial activity, but enhanced coloring and cost of the complex agent. Increase in TBZ content resulted in increase of antifungal activity, but decrease of water solubility of the complex agent. The antimicrobial MICs of the complex agent to Esherichia coil, Staphylococcus aureus, Candida albicans, Aspergillus niger, Mucor sp. were 20 -80, 15 -60, 20 - 55, 40 - 250, and 400 - 1700 mg/kg, respectively. Addition of 0.1% of this complex agent to acrylic emulsion paint made the paint without substantial change in color, luster, viscosity, odor or pH value, but with an excellent and chronically persisting broad-spectra antimicrobial activity.

Research on the Anticorrosion Coating Under the Paved Layer for Highway Steel Box Bridge Deck

The corrosion of the anticorrosion coating and the defects of the asphalt concrete paved layer have been investigated on long-span steel box bridge decks. The anticorrosion coating lies in the midclle of two entirely different materials： a highway steel box bridge deck and a paved layer, which is used as anticorrosion and waterproof coating for the steel bridge deck. For our study, electrochemical corrosion and pull strength experiments have been selected for the investigation of the corrosion properties of inorganic zinc rich coating, epoxy zinc rich coating and arc sprayed zinc coating. The adhesive strength between the coatings and the panel, and the effect of the coating corrosion on the shear properties of the paved layers including cast asphalt, thermal asphalt mortar, epoxy asphalt and modified asphalt con- crete have been investigated. The results show that the adhesive strength between the coatings and the bridge panel is controlled by the method of pre-processing rust removal. Coating by sandblasting has stronger adhesive strength than coating by shot peening. The results also reveal that shear strength of the paved layer is affected by the corrosion product of zinc coating. The arc sprayed zinc coating has stronger shear strength than zinc rich coatings.

Double-layer Modifi cation of Water-based Aluminum with SiO2 and Polyacrylic Acid by Solgel Process and in situ Polymerization

A double-layer aluminum consisting of an aluminum core and a shellof SiO2 and polyacrylic acid was synthesized.This modified aluminum was used to improve the corrosion resistance and dispersive property of aluminum in waterborne media.TEM,FTIR,XPS,and EDX determination showed that PAA and SiO2 were coated on the surface of aluminum.Evolved hydrogen detection showed that the corrosion resistance of composite particle had been markedly improved.Maximum corrosion inhibition efficiency of SiO2 coated aluminum（SiO2@Al）was 95.1% while that of double-layer coated aluminum（PAA/SiO2@Al）was 98.8%.Meanwhile,polyacrylic acid layer improved the agglomeration of aluminum significantly.According to the dispersibility test,the particle size of 50% volume fraction [d（0.5）] of aluminum,SiO2@Aland PAA/SiO2@Alwere 42,53,and 34 μm,respectively.

New Nano Polymer Materials for Composite Exterior-Wall Coatings

A triethylenetetramine epoxy mixture was synthesized through the reaction of a low-molecular-weight liquid epoxy resin with triethylenetetramine(TETA).Then triethyltetramine(TETA)was injected dropwise into a pro-pylene glycol methyl ether(PM)solution for chain extension reaction.A hydrophilic andflexible polyether seg-ment was introduced into the hardener molecule.The effects of TETA/DGEPG,reaction temperature and reaction time on the epoxy conversion of polyethylene glycol diglycidyl ether(DGEPG)were studied.In addition,several alternate strategies to add epoxy resin to the high-speed dispersion machine and synthesize MEA DGEBA adduct(without catalyst and with bisphenol A diglycidyl ether epoxy resin)were compared.It was found that the higher the molecular weight of triethylenetetramine,the longer the chain segment of the surface active molecule.When the equivalence ratio of amine hydrogen and epoxy group is low,the stability of lotion is good.When the ratio of amine hydrogen to epoxy group is large,the content of triethylenetetramine is small.The main objective of this study is the provision of new data and knowledge for the development of new materials in the coating and electronic industry.

Mix design method of asphalt rubber open-graded friction course and its application in overlay

The mix design method of asphalt rubber open-graded friction course （AR-OGFC） by the Marshall test and key technologies of AR-OGFC overlay are studied. Based on the draindown test, the stripping test and the Marshall test by different beating times, the asphalt content estimating method and Marshall beat criterion are studied. It is found that the asphalt content of AR-OGFC can be estimated by the formula of Arizona, and the proper Marshall test criterion for AR-OGFC is 50 beats on both sides. By analyzing the influence of gradation on OGFC performance, the gradation of AR-OGFC is recommended, and the amount of aggregate passing 4. 75 mm should be minimized for AR-OGFC. Through investigation of AR-OGFC overlay projects, key technologies such as the treatment of underlying pavement and the selection of tack coat are advanced, and modified emulsified asphalt should be used in AR-OGFC overlay tack coat.

重质碳酸钙/粒化高炉矿渣粉复合对沥青防水涂料性能的影响

以丙烯酸乳液和乳化沥青为树脂基料,以不同细度的重质碳酸钙(GCC)和粒化高炉矿渣粉(GS)为无机填料,并添加消泡剂、增稠剂等助剂,制备出一种改性沥青防水涂料。探究了GCC/GS复合对改性沥青防水涂料性能的影响,通过测定不同细度的GCC和GS双掺制备的涂层在不同环境中的拉伸性能、黏结强度、吸水率及低温柔度等性能,分析了GCC/GS复合时其细度及掺量对防水涂料性能的影响。同时,采用扫描电镜(SEM)观察了不同细度的GCC和GS以不同比例双掺时制备的涂层表面微观形貌。结果表明:GCC/GS的细度及双掺比例会对改性沥青防水涂料的性能产生显著影响,当600目的GCC-A与S95级的GS-A双掺且w(GS)=12%时涂膜综合性能较好。

稀浆封层沥青路面路用性能研究

为了评估稀浆封层沥青路面的路用性能,文章采用90#基质沥青和SBR改性剂,通过动稳定度、抗弯拉强度、渗水系数、粘结强度和抗滑摆值等试验,系统分析了稀浆封层及其改性剂的性能表现,研究结果表明,稀浆封层能够提高沥青路面的高温稳定性、低温抗裂性和防水性能,尤其是SBR改性剂的掺入,进一步增强了沥青混合料的路用性能,尤其在高温和低温条件下表现突出,尽管抗滑摆值有所下降,但仍满足规范要求,显示出较好的路用性能。

预裹覆沥青碎石同步封层施工技术

针对公路尤其是大车流量的市政道路在使用中出现各类病害的问题,提出采用适宜的封层技术进行维养是保障通行质量、提高使用寿命的有效手段。本文通过预裹覆沥青碎石同步封层技术应用在工程案例中,并对施工各个环节中的质量要求与控制方案进行介绍,评价施工后的路面改善效果,旨在为后续的市政道路维养方案选择与施工指导提供必要参考。

水性高粘喷涂速凝橡胶沥青防水涂料的研发与应用

制备了一种双组分水性高粘喷涂速凝橡胶沥青防水涂料,主剂A组分为阴离子乳化沥青、阴离子氯丁胶乳和阴离子丁苯胶乳,固化剂B组分为硫酸锌水溶液,两个组分通过专用喷涂设备喷出后雾化析水成膜。探讨了各组分配比对涂料性能的影响以及涂料与不同自粘防水卷材复合应用的效果,结果表明,200#乳化沥青∶90#乳化沥青质量比1∶3、氯丁胶乳含量为20%、丁苯胶乳含量为12%制得的涂料性能最佳。该涂料可与不同类型的自粘防水卷材复合应用,粘结效果均较好。

Influence of the Temperature on Coated Bituminous of Road Structures in Senegal (West Africa)

The Senegalese road network is strongly influenced in the long term by seasonal variations in climate and weather conditions. Indeed, much of the damage is due to these environmental factors. The objective of this paper is to study the behaviour of bituminous structures under the effect of high temperatures. Material samples were taken for a physico-mechanical characterization of the coated components. The results show that Marshall creep (2.87, 3.39, 5, 5.5 mm) and the bitumen penetrability increase with the increasing of temperatures respectively from 34°C to 45°C and from 20°C to 50°C. Marshall Stability drops from 15.81 kN to 11.31 kN for temperatures between 34°C and 45°C. The simulation carried out on Alize-LCPC shows an increase in distortions of traction at the basis of the rolling layer and at the top of the platform if temperatures vary between 34°C and 45°C. This work makes it possible to conform that the bituminous concrete is thermally sensitive and the hypothesis of fixing the constant modulus of the bituminous layers in Senegal for all projects remains unsuitable for a good dimensioning of sustainable road structures. The knowledge of the equivalent regional temperature will make it possible to produce quality pavements with a long lifespan.

煤制油沥青改性制备包覆沥青及其表征分析

以煤制油沥青(coal to oil asphalt,CTOA)为原料,加入乙烯焦油沥青(ethylene tar pitch,ETP)进行改性,采用热聚合法制备出高品质的包覆沥青。在最佳热聚合工艺条件下制备出200^(#)包覆沥青;利用元素分析仪、红外光谱仪、拉曼光谱仪、X射线衍射仪、扫描电子显微镜、热重分析仪等对包覆沥青的微观形貌、结构和组成进行分析。结果表明,相较于空气氧化法和催化交联聚合法,改性和热聚合所制备的200^(#)包覆沥青的QI和灰分质量分数显著降低,产品性能优异;微观结构和组成分析表明,包覆沥青分子具有较高的碳质量分数和芳香缩合度,分子中类石墨结构增多,碳微晶排列规整,热重分析结果进一步证实其热稳定性显著增强,可用作锂电负极包覆材料。

基于沥青砂涂层设计的沥青混凝土路面抗紫外光老化性能分析

针对沥青路面光老化问题,参照含砂雾封层技术原理,基于沥青抗紫外光添加剂最优组合,制备含砂沥青涂层,开展不同级配和厚度的沥青砂涂层试验研究,通过沥青混凝土高低温性能试验和抗滑性能试验分析含砂涂层设计下沥青混凝土路面抗光老化性能,结果表明:涂层设计下沥青路面老化前后抗滑性能降低,但是相比于无涂层时老化后降低幅度变小且仍满足规范要求,在不考虑抗滑损失的情况下,可选择使用;老化后高低温路用性能试验说明增加路表面密实度可以提高抗光老化能力,但是涂层厚度不宜过厚,以基本完全填充混凝土表面空隙最好,建议理论厚度2 mm,要重点考虑细料涂层的级配设计,适当提高沥青砂中较大粒径的比例对封层设计效果会更好。

不黏轮乳化沥青试验方法研究

不黏轮乳化沥青是一种解决沥青路面施工中“黏轮问题”的关键材料,其中不黏轮效果是其核心指标。不黏轮效果准确评价对不黏轮乳化沥青推广应用至关重要。该文基于国内外研究成果创新提出两种不黏轮效果试验方法(配重法、压头法),并对多种乳化沥青进行不黏轮效果评价。试验结果表明:两种试验方法(配重法、压头法)能够较好地评价乳化沥青的不黏轮性能且试验结果具有很好的一致性。其中配重法适合于工程现场快速评价,压头法适合于科学研究、试验检测分析。两种试验方法设备简单、操作方便,适用于工程现场、室内研究等多种场景的不黏轮乳化沥青不黏轮效果评价。

柔性环氧沥青防腐涂料的制备及性能研究

混凝土防护工程表面涂层需要兼顾防水和防腐性能,且可以抵抗基层裂纹,市场上常见的柔性环氧防腐涂料主要适用于金属基材,具有一定柔性但没有延伸性,涂层易发生片状脱落。通过将乳化沥青、聚合物乳液和改性聚醚胺复配,制得高性价比且具有延伸性的柔性环氧防腐涂料。试验结果表明:当m(乳化沥青)∶m(聚合物乳液)∶m(改性聚醚胺)=48.2∶15∶10时,制备的防腐涂料25℃断裂伸长率达56.5%,低温柔性达-5℃;不透水性、耐腐蚀性和电化学阻抗测试结果表明,该涂料具有良好的耐水性和耐腐蚀性。

一起220 kV输电线路支柱绝缘子断裂原因分析

针对一起220 kV输电线路支柱绝缘子断裂案例,通过对拆解后的绝缘子现场检查,并结合超声波探伤检测,对绝缘子断裂原因进行综合分析。结果表明:断裂的瓷支柱绝缘子瓷件胶装部位不符合国家标准,未采用喷砂、涂抹沥青等通用制造工艺,无法缓冲瓷、胶合剂和金属附件膨胀系数差异产生的应力,在应力的长期作用下,支柱绝缘子铁瓷结合部位发生断裂。

一种双胎基弹性体改性沥青防水卷材的产品设计及T型缝搭接性能研究

介绍了一种双胎基弹性体改性沥青防水卷材,该产品采用SBS热塑性弹性体作为改性剂,结合优质聚酯胎基布形成7层结构。为解决双胎基设计导致的卷材过厚问题,本产品引入超薄胎基,增强了搭接边的伏贴性,并提升了改性沥青涂盖料的设计用量。研究表明,在T型搭接部位,通过单独热熔施工和采用沥青涂料进行细部增强,可以显著提高搭接部位的粘结性能,进而提升防水系统的可靠性。

橡胶粉对非固化橡胶沥青涂料性能的影响研究

为了研究橡胶粉对非固化橡胶沥青防水涂料性能的影响,文中选用大卡车轮胎、小轿车轮胎和橡胶鞋底经常温破碎后进行试验,结合不同类别、不同添加量进行对比,并考察涂料的耐热性、低温柔性、延伸性、130℃黏度和163℃离析性。结果表明,当非固化橡胶沥青防水涂料选用橡胶粉作为改性剂时,最适合作为改性剂的为大卡车轮胎橡胶粉,其添加量应控制在6%~7%。

TCL集团模组整机一体化智能制造产业园地下防水技术

TCL集团模组整机一体化智能制造产业园——华星光电高世代模组二期地下防水工程,底板与侧墙采用2.0 mm厚自粘聚合物改性沥青防水卷材;种植顶板采用1.5 mm厚非固化橡胶沥青防水涂料+4.0 mm厚自粘聚合物改性沥青耐根穿刺防水卷材的涂卷复合施工方案。该方案施工效率高,防水效果良好,可为类似工程提供参考。

水性聚氨酯改性不黏轮乳化沥青制备及其路用性能研究

为了解决沥青路面施工中黏层黏轮和服役中层间黏结不足的问题,制备了一种具有自迁移功能的水性聚氨酯改性不黏轮乳化沥青。通过针入度、软化点及不黏轮效果等实验评价了不黏轮乳化沥青路用性能,研究了水性聚氨酯改性不黏轮乳化沥青黏层微观形貌和流变特性。研究结果表明:水性聚氨酯改性剂在乳化沥青黏层养生过程中自主迁移至黏层表面;水性聚氨酯在不黏轮乳化沥青最佳掺量为3%;在35℃时,水性聚氨酯改性不黏轮乳化沥青黏层养生时间不大于30 min;水性聚氨酯改性不黏轮乳化沥青黏层在60℃时剪切强度大于1 MPa,在70℃时未发生黏轮现象,具有解决沥青路面施工中黏层黏轮和服役中层间黏结不足难题的潜力。水性聚氨酯改性不黏轮乳化沥青路用性能突出和施工过程环境友好,因此其有望在公路建设和养护工程中得到大规模应用,并可提高沥青路面服役寿命,助力公路交通高质量的发展。

沥青纤维碎石封层在高速公路养护中的应用分析

文章结合工程实际,选取了SBS改性乳化沥青、玻璃纤维和玄武岩碎石作为封层原材料,针对原材料特点总结并提出了沥青纤维碎石封层施工工艺。测试结果表明,采用沥青纤维碎石封层对路面进行铺筑和养护后,路面的抗滑性能提高,渗水性能下降。采用沥青纤维碎石封层施工,对推动公路养护技术的发展、延长路面使用寿命具有较好的效果。