Preparation and Characterization of Carboxyl-terminated Poly(butadiene-co-acrylonitrile)-epoxy Resin Prepolymers for Fusion-bonded-epoxy Powder Coating

Liquid carboxyl-terminated poly（butadiene-co-acrylonitrile）（CTBN）-epoxy resin（EP） prepolymers were prepared with different contents of CTBN.The chemical reactions between EP and CTBN were characterized by Fourier ransform infrared（FTIR） spectroscopy and gel permeation chromatography（GPC）.The scanning electron micrograph（SEM） and dynamic mechanical analysis（DMA） of curing films showed phase separation,and the rubber particles were finely dispersed in the epoxy matrix.Mechanical properties analysis of curing films showed that impact strength and elongation at break increased significantly upon the addition of CTBN,indicating good toughness of the modified epoxy resins.Thermogravimetric analysis（TGA） showed that the incorporation of CTBN had little effect on the thermal stability of EP.Fusion-bonded-epoxy（FBE） powder coatings modified with CTBN-EP prepolymers were prepared.The experimental results demonstrate the ability of CTBN-EP prepolymers,toughening technology to dramatically enhance the flexibility and impact resistance of FBE coatings without compromising other key properties such as corrosion protection.

Corrosion resistance of waterborne epoxy coating pigmented by nano-sized aluminium powder on steel

A novel kind of waterborne epoxy coating pigmented by nano-sized aluminium powders on high strength steel was formulated. Several coatings with different pigment volume content (PVC) were prepared. The coating morphology was observed using scanning electron microscopy (SEM), and the electrochemical properties were investigated by electrochemical impedance spectroscopy (EIS). Immersion test and neutral salt spray test were also conducted to investigate the corrosion resistance of the coating. It is demonstrated that the critical pigment volume content (CPVC) value is between 30% and 40%. The coating with PVC of 30% exhibits good corrosion resistance in 3.5% (mass fraction) NaCl solution.

Developing polydopamine modified molybdenum disulfide/epoxy resin powder coatings with enhanced anticorrosion performance and wear resistance on magnesium lithium alloys

Epoxy resin powder coating has been successfully applied on the corrosion protection of magnesium lithium alloys.However,poor wear resistance and microcracks formed during the solidification have limited it extensive application.There are limited approaches to exploit such anti-corrosion and mechanical properties of magnesium lithium alloys.Herein,the epoxy resin powder coating with polydopamine modified molybdenum disulfide(MoS_(2)@PDA-EP powder coating with 0,0.1,0.2,0.5,1.0 wt.%loading)was well prepared by melt extrusion to investigate its anticorrosion performance and wear resistance.The results revealed that the addition of MoS_(2)@PDA enhanced the adhesion strength between coatings and alloys,wear resistance and corrosion protection of the powder coatings.Among them,the optimum was obtained by 0.2 wt.%MoS_(2)@PDA-EP powder coating which could be attributed to well dispersion and efficient adhesion with coating matrix.To conclude,MoS_(2)@PDA-EP powder coating is meaningfully beneficial for the anticorrosive and wear performance improvement of magnesium lithium alloys.

Curing Kinetics, Mechanical Properties and Thermal Stability of Epoxy/Graphene Nanoplatelets(GNPs) Powder Coatings

Epoxy/graphene nanoplatelets（GNPs） powder coatings were fabricated using ultrasonic predispersion of GNPs and melt-blend extrusion method. The isothermal curing kinetics of epoxy/GNPs powder coating were monitored by means of real-time Fourier transform infrared spectroscopy（FT-IR） with a heating cell. The mechanical properties of the epoxy/GNPs cured coatings had been investigated, by evaluating their fracture surfaces with field-emission scanning electron microscopy（FE-SEM） after three-point-bending tests. The thermal stability of the epoxy/GNPs cured coatings was studied by thermo-gravimetric analysis（TGA）. The isothermal curing kinetics result showed that the GNPs would not affect the autocatalytic reaction mechanism, but the loading of GNPs below 1.0 wt % additive played a prompting role in the curing of the epoxy/GNPs powder coatings. The fracture strain, fracture toughness and impact resistance of the epoxy/GNPs cured coatings increased dramatically at low levels of GNPs loading（1 wt %）, indicating that the GNPs could improve the toughness of the epoxy/GNPs powder coatings. Furthermore, from FE-SEM studies of the fracture surfaces, the possible toughening mechanisms of the epoxy/GNPs cured coatings were proposed. TGA result showed that the incorporation of GNPs improved the thermal stability of the cured coatings. Hence, the GNPs modified epoxy can be an efficient approach to toughen epoxy powder coating along with improving their thermal stability.

Preparation of Silica Powder in Epoxy Resin Wear-Resistant Coating

Silicon powders possess good thermal stability and rub resistance and can be used as the filler of high temperature wear-resistant coating;it can possess good wettability and dispersibility in the organic polymer by surface modification of silane coupling agent. Organic silicon has good thermal stability, which can modify the frangibility and thermal stability of epoxy resin. A certain proportion of modified silica powder, curing agent and additives were dispersed to modified epoxy resin can compound wear-resistant coating. The results show that: the modification effect can be the best if the dosage of silane coupling agent is 1.5% of silicon powder. If the methyl triethoxy silane is 50 phr and modified silica powder is 200 phr, then various performances of coating tend to be the best.

Effects of direct stray current on the performance of cathodic disbonding epoxy powder coatings

The influence of the direction and magnitude of direct(DC)stray current on the disbonding performance of epoxy powder coating was studied by using electrochemical impedance spectroscopy and scanning electron microscopy technology.The results show that the application of DC stray current could accelerate the anodic dissolution.The peeling degree of the coating increases as the magnitude of positive DC stray current interference increases in the range of 2–8V.With 16V positive stray current disturbance,the degree of coating disbonding decreases.With the application of negative stray current,the coating peeling becomes more serious,and the degree of peeling increases as the DC stray current increases.

Mechanical Properties of Epoxy Composite Materials Produced with Different Ceramic Powders

In this study, production and mechanical properties of polymer composite materials obtained by using Al2O3, SiO2, MgO and TiO2 hard ceramic fillers were studied. Epoxy resin was used as the matrix material, and four different ceramic powders were mechanically mixed into the resin at 3% and 5% as reinforcement. The mechanical properties of the polymer composite materials were then characterized. For this purpose, flexural modulus and flexural strength of composite materials were determined by using three point bending test and impact toughness of the materials were determined by Charpy impact test. In addition, the hardness values of the samples were determined by Shore D hardness test.

冷涂烯锌涂料的制备与性能研究

首先研究了不同环氧树脂(E20、E44和E51)对环氧含锌涂层基本性能的影响,其次探究了纯薄石墨烯的添加对涂层防腐蚀性和力学性能的影响,确定了锌质量分数30%涂料体系中纯薄石墨烯的最佳添加量,最后考察了膨润土、聚脲、聚酰胺钠作为防沉体系对冷涂烯锌涂料贮存稳定性的作用。通过中性盐雾试验,并结合扫描电镜、表面电阻率、剩余锌含量和力学性能测试,制备出符合T/CHTS 10105—2023标准要求的冷涂烯锌涂料。结果表明:采用环氧树脂E44所制备的涂层基本性能最佳;加入质量分数0.5%纯薄石墨烯后,涂层的力学性能均有提升,表面电阻率≤10^(6)Ω,锌粉利用率超过80%,耐中性盐雾时间可达3000 h;添加质量分数0.9%膨润土、0.6%聚脲和1%聚酰胺钠防沉体系后,冷涂烯锌涂料可在50℃下稳定贮存60 d。

石化储罐水性导静电防腐涂料制备及性能研究

为解决石化储罐在储存、运输过程可能由于积聚电荷产生的安全隐患,以及水性导静电涂料耐腐蚀性差的问题,以环氧类乳液及导电云母粉为主要原料制备导静电涂层,通过水热法制备了碳纳米点,将其以不同比例添加,增强涂层的防腐性能。并对涂层进行耐化学浸泡实验、耐盐雾实验以及力学性能测试。结果表明选用浙江安邦新材料发展有限公司的环氧乳液A与固化剂A作为成膜物,导电云母粉质量含量为15%,碳纳米点质量含量为1%的涂层表现最为良好。

一种无溶剂型电子封装用导电胶的研制

为了解决导电胶黏剂因综合性能不足而导致大规模应用的受限,本文以酚醛环氧、多官能环氧为导电胶树脂基体,选用了4,4′-二氨基二苯砜(DDS)作为固化剂,片状银粉作为导电填料,通过调节银粉和固化剂的用量,制备了有良好流变性、导电性、力学性能的导电胶。通过分析测试,得到导电胶的黏度为32 800 mPa·s,触变指数为4.0,体积电阻率为4.34×10^(-4)Ω·cm,剪切强度为17 MPa,热导率为3.96 W/(m·K),Cl^(-)、Na^(+)和K^(+)分别仅为6.79×10^(-5)、6.31×10^(-5)和<10^(-5)。该导电胶综合性能优异,可应用于电子元器件及其他导电导热功能性材料的粘接。

粉状环氧树脂固化改性IXPE发泡材料的制备及性能研究

采用化学发泡法和辐照交联工艺成功制备了一系列聚乙烯/双酚A环氧树脂/双氰胺(LDPE/E-20/DCD)复合发泡材料,探究了E-20/DCD固化含量对LDPE/E-20/DCD复合发泡材料的表观密度、凝胶含量、力学性能、吸水率和隔音性能的影响。结果表明,当E-20/DCD固化含量为10%时,LDPE/E-20/DCD复合发泡材料具有较优的综合性能。相比纯辐照交联聚乙烯发泡材料(IXPE)发泡材料,其表观密度提高2.7%,凝胶含量提高5.9%,拉伸强度提高36.6%,压缩强度提高23.4%,压缩模量提高11.8%,硬度提高61.2%,隔声指数提高22.5%,同时具有优异的泡孔结构。

长余辉粉体的含量和分散对环氧树脂性能的影响

将长余辉粉体(LAP)分散于树脂涂层制备的蓄能自发光涂层在安全标识领域具有广阔的应用前景,LAP在树脂中的分散性对涂层材料性能具有重要影响。以环氧树脂(EP)为基体,以球磨共混的方式在EP基体中加入不同含量的LAP用以制备EP/LAP自发光复合材料。研究了不同LAP含量及球磨工艺对复合材料结构、发光效果、摩擦性能及力学性能的影响。利用扫描电子显微镜和傅里叶变化红外光谱观察和分析了EP/LAP复合材料的断裂形貌和各组分相互作用。结果表明,球磨有效改善了LAP在EP中的分散性,提升了材料发光均匀性、热稳定性、力学性能,降低了摩擦系数。LAP未对EP的化学固化反应过程产生影响,两者未发生化学反应,EP/LAP复合材料可以实现有效固化。LAP含量过高不利于复合材料的力学性能和摩擦性能。在LAP添加量为5份时,经球磨制备的EP/LAP复合材料具有最佳的综合性能,摩擦系数降低至0.12,拉伸强度提升至28.77 MPa,同时发光均匀性得到有效提升。此外,EP/LAP复合材料表现出良好的发光效果。

WO_(3)/玄武岩粉/环氧树脂复合辐射屏蔽材料的制备和研究

制备了以环氧树脂为基体,氧化钨和玄武岩粉为填料的复合辐射屏蔽材料。通过XRD和SEM对复合材料进行表征。通过热重分析和辐射性能测试填充氧化钨和玄武岩粉后的复合辐射屏蔽材料。结果表明,采用kh560表面改性的WO_(3)/玄武岩粉混杂颗粒填充环氧树脂的分散良好;WO_(3)和玄武岩粉的填充增加了复合材料的热稳定性和辐射屏蔽能力,在59.5 keV能量下,质量分数50%WO_(3)的质量衰减系数是纯环氧树脂的7倍。

内涂塑技术在巴油FPSO项目中的应用

随着海洋油气勘探的不断深入和深海油气资源的逐渐开发,FPSO(浮式生产储油船)已成为海上油气生产的主要设施之一。FPSO管道系统在海洋环境中长时间暴露于潮湿、腐蚀的条件下,对其防腐保护提出了更高的要求。探讨了内涂熔结环氧粉末涂层技术在巴西FPSO项目上的应用技术,为同类项目的施工提供建议。

水性环氧导静电耐油防腐涂料的制备及性能分析

以水性环氧乳液和水性环氧固化剂为成膜物质,导电云母粉为导电填料,并配合防腐蚀颜填料以及助剂,制备了一款具有优异导静电性能以及防腐蚀性能的水性环氧导静电耐油防腐涂料。重点讨论了水性环氧固化剂和水性环氧乳液配比对涂膜性能的影响、导电填料的用量对涂料导电性能的影响,通过正交试验确定了水性环氧导静电耐油防腐涂料配方中防锈颜填料与树脂的配比,分析了不同干燥时间、不同涂层厚度对表面电阻率变化的影响。结果表明,当水性环氧固化剂与水性环氧乳液配比为环氧/胺氢当量比为1.2,导电云母粉质量分数在18%左右,涂层的导静电性能以及防腐蚀性能达到最优,可用于石化行业贮油罐、输油管道、运输油罐等贮油、输油设备的内防腐及导静电保护。

静电喷涂电机槽绝缘工艺应用研究

静电喷涂电机槽绝缘技术在民用电机自动化生产线上已大量成功应用。由于涂层厚度较厚(厚度大于0.3 mm)及涂层耐温度冲击性能未知,因此在槽满率较高及应用环境温度跨度较大的场合应用受限。本文通过对喷涂过程的工艺参数、涂层厚度(端面与槽内)的均匀性、涂层固化参数等进行工艺验证,得到了最佳工艺条件;并分析研究了电机应用该槽绝缘技术后,在环境试验中的绝缘电阻及涂层性能稳定,进而得出在大温冲下该涂层可作为电机槽绝缘应用。

油气管道防腐材料检测现状分析及建议

油气管道是能源输送的重要部件,受输送介质和外界环境的影响,油气管道极易发生腐蚀、泄漏。防腐材料性能是影响油气管道质量的关键因素,从源头上控制防腐材料质量,可以有效提升油气管道的安全性、可靠性和耐久性。本文总结了国内外油气管道防腐材料的主要检测标准,重点分析了六类油气管道防腐材料的检测现状,并给出了相关建议,以进一步提升油气管道质量。

鹤大高速公路护栏改造工程新材料及新工艺应用研究

G11鹤大高速公路运行近20年,现状护栏腐蚀严重。为保证高速公路运营管理的顺畅及用路人的安全,文章着眼该高速公路波形梁钢护栏改造升级,采用更加环保的高性能熔融结合环氧粉末进行防腐涂装。该防腐涂装是一种绿色、成熟、低能耗的新型环保涂装技术,涂装后的钢构件耐腐蚀性能优异,更具有超长耐久性、高性价比和轻维护等特性。

Effect of Curing Procedure on the Properties of Copper-Powder-Filled Conductive Adhesives

By means of testing the shear strength with single lap joint, measuring electrical resistivity for cured products and the curing strain with strain gauges, the effect of cure parameters on the properties of HT1012 conductive adhesive filled with copper powder was investigated, and the residual stress in the conductive adhesives was also estimated. The experimental results show that the properties such as shear strength of the adhesives, electrical resistivity of products as well as the residual stress of cured HT 1012 copperfitted conductive adhesive were evidently affected by curing temperature and time. The diagrams of scanning electron microscopy （SEM） and Fourier transform infrared （FT-IR） were also used to determine the properties. The higher mechanical property was achieved under the condition of curing the adhesive 3 h at 60 ℃ as the density of the hydrogen links or linkages existed in the adhesive was relatively higher and the lower electrical resistivity occurred at 80 ℃.

体育器材抗腐蚀有机涂层的制备与性能分析

为实现针对体育器材结构中关键部件的有效保护,本次研究通过纳米二氧化硅对环氧粉末实施改性处理,制备出改性纳米二氧化硅复合环氧涂层。在此基础上,通过X射线衍射分析手段来探究改性前后纳米材料的结晶情况,通过耐中性盐雾测试来验证复合环氧涂层的抗腐蚀性能。经实验研究发现,复合环氧涂层相比于纯环氧涂层来说在抗腐蚀性能方面具有显著优势,且当纳米二氧化硅含量为0.2%时,复合环氧涂层的抗腐蚀性能最为优异。