KH560改性纳米硅溶胶对苯丙涂层性能的影响

目的提高硅溶胶-苯丙复合涂层的综合性能,为有机-无机复合涂层的应用提供一定的参考意义。方法采用水浴加热机械搅拌/超声分散法,用KH560对硅溶胶进行表面改性,并将改性前后的硅溶胶与苯丙乳液共混,制备了含改性前后硅溶胶15%、30%、45%(质量分数,全文同)的硅溶胶-苯丙复合涂层。用红外光谱仪证实改性成功。用紫外/可见/近红外分光光度计、力学性能测试仪、扫描电子显微镜对改性前后硅溶胶-苯丙复合涂层综合性能及微观结构进行表征。结果含有改性后硅溶胶的复合涂层综合性能得到明显提高,当改性硅溶胶掺量为30%时,复合涂层综合性能最好,此时复合涂层磨耗值为0.078 g,附着力为1级,抗冲击性为62 mm,拉伸强度为4.74 MPa,断裂伸长率为215.90%,附着力、抗冲击性、拉伸强度和断裂伸长率分别比相同掺量下未改性硅溶胶复合涂层提高1级、6 mm、0.59 MPa和10.34%。结论 KH560可成功地对硅溶胶进行表面改性,将改性后的硅溶胶替代未改性的硅溶胶可提高硅溶胶-苯丙复合涂层的综合性能,实际应用时改性硅溶胶掺量以30%为宜。     

改性硅溶胶-苯丙乳液复合涂层的制备及性能

目的 以硅溶胶、苯丙乳液为主要原材料,制备高性能有机-无机复合涂层,并为其应用提供一定价值的参考.方法 采用KH550、KH560以及KH570等3种硅烷偶联剂依次对硅溶胶进行接枝改性,选用改性效果较好的硅溶胶,制备改性硅溶胶添加量为0％、35％、70％、105％(相对于苯丙乳液的质量百分比)的4种涂层.用傅里叶变换红外光谱仪、马尔文Zeta电位仪以及扫描电子显微镜对硅溶胶的改性效果进行表征,用多功能材料表面性能试验仪等涂层力学测试仪、紫外/可见/近红外分光光度计、扫描电子显微镜分别对4种涂层的力学性能、隔热节能性能及微观形貌进行表征.结果 KH560对碱性硅溶胶的接枝改性效果最优.向苯丙乳液中添加一定量的改性硅溶胶可以显著提升涂层性能.当改性硅溶胶添加量为苯丙乳液质量的70％时,涂层综合性能提升最高,此时涂层太阳光反射比为0.683,近红外反射比为0.624,附着力为3.85 MPa,1000圈磨损后的质量损失率为53％,抗拉强度为5.4 MPa,但断裂伸长率降低较为明显,仅为49.8％.结论 KH560更适合对碱性硅溶胶进行接枝改性.添加KH560改性硅溶胶后,苯丙乳液涂层的力学性能、隔热节能性能得到了显著提升.实际使用时,建议改性硅溶胶添加量为苯丙乳液质量的70％.     

低密度抗压防热涂层制备与性能

目的以硅橡胶为树脂基体,通过添加补强填料、空心微球、助剂、分散溶剂等,制备低密度抗压防热涂层。方法首先从低密度抗压涂层的特点分析了低密度抗压涂层的设计思路,然后从补强硅橡胶、填料及涂料的储存稳定性三方面对涂层配方进行了分析,最后对涂层物理、粘接、固化、抗压性能进行了分析。结果低密度抗压放热涂层需具备韧性好、强度高、孔隙率低等特点。通过补强填料比例优化和空心微球复配,兼顾了涂层低密度和高抗压的特点。通过防沉助剂的添加,大幅改善了低密度涂料的分层和结块现象。所制备低密度抗压防热涂层室温放置6 d后固化完全,涂层密度为0.457 g/cm~3,拉伸强度为1.51 MPa,涂层与基材具有良好的粘接性,在2 MPa的压力下放置20 d,厚度减少12%~13%。结论制备得到的低密度抗压涂层密度低于0.5 g/cm~3,且具有优良的抗压性能,未来可用于气动热防护。     

水性聚氨酯的合成及可剥涂料的性能研究

目的以水性聚氨酯为主要成膜物质,制备一种耐水性良好且涂层整体可剥的保护涂料。方法首先采用正交法分析水性聚氨酯的合成工艺,并通过测试红外图谱、存储时间、外观及耐水性,分析三乙胺和H2O含量对产物性能的影响。再以合成产物为基料,加入固化剂聚碳化二亚胺及其他助剂制备水性涂料,通过测试邵氏硬度、附着力、拉伸强度、断裂伸长率、剥离强度及耐水性,分析该水性涂料的可保护性和可剥性。结果红外图谱表明成功合成了水性聚氨酯,得出了自乳化型水性聚氨酯的最佳合成工艺。涂料工艺性和涂层的综合性能良好,涂层可以一次性整体剥离。该涂层附着力为4B,具有良好的耐水性,在室温水中浸泡48 h后,质量基本不变,拉伸强度由37.7 MPa变为33.6 MPa,断裂伸长率由540%变为510%,邵氏硬度仍为82HA。结论聚碳化二亚胺和其他助剂的加入使得涂层具有良好的可剥性和耐水性,且涂层硬度为82HA,对基材能起到一定的保护作用。     

硅烷偶联剂改性硅藻土及其对天然橡胶/丁苯橡胶补强效果的影响

用不同的硅烷偶联剂对硅藻土进行表面改性,并将改性前后的硅藻土替代白炭黑添加到天然橡胶/丁苯橡胶并用胶中,研究了改性工艺、机理及其对橡胶补强效果的影响规律。结果表明,偶联剂硅烷KH570或Si69的最佳用量均为1.2%,改性后硅藻土颗粒表面呈现一定的疏水性。未改性硅藻土替代白炭黑后填充在天然胶橡/丁苯橡胶中后材料的抗拉强度为14.9MPa,撕裂强度32.5kN/m,300%定伸应力5.0MPa。两种硅烷偶联剂改性硅藻土后均能提高材料的撕裂强度、抗拉强度和300%定伸应力,但是不利于提高材料的扯断伸长率。填充1.2%偶联剂硅烷KH570改性硅藻土制得的橡胶样片撕裂强度提高了7.4%,300%定伸应力提高了62%,抗拉强度提高了18.1%,但扯断伸长率降低了17.4%。填充1.2%偶联剂硅烷Si69改性硅藻土制得的橡胶样片撕裂强度提高了21.8%,300%定伸应力提高了68%,抗拉强度提高了9.2%,同样扯断伸长率降低了24.5%。机理分析表明,硅烷偶联剂与硅藻土颗粒表面的吸附方式为化学吸附。     

硅橡胶涂料的研究进展

硅橡胶涂料是一种应用十分广泛的多功能涂料。概述了硅橡胶涂料的优点，包括表面能低、机械性能和热性能稳定、耐腐蚀、阻燃等。同时归纳了硅橡胶涂料在改性过程中存在的问题，包括与无机纳米粒子相容性较差，表面处理步骤繁琐等。在此基础上，重点综述了近年来改性硅橡胶涂料在防覆冰、自清洁、阻燃、防腐蚀领域的研究进展。防覆冰硅橡胶涂料改性方式主要有添加纳米粒子改性、添加聚合物改性、对涂层进行表面处理等，同时介绍了表面形貌对结冰机理的影响；自清洁硅橡胶涂料主要通过表面处理、添加纳米粒子或聚合物改性制备；阻燃硅橡胶涂料可以与其他阻燃剂复配使用，同时也能赋予涂覆物自清洁性能；防腐蚀硅橡胶涂料可以通过添加聚合物形成交联网络、添加纳米粒子改性或等离子体氧化制得。针对应用于不同领域的硅橡胶涂料，分别从改性方式的可操作性，添加不同组分对所制备涂料结构与性能的影响，涂料的多功能化等方面进行了归纳，最后展望了硅橡胶涂料未来的研究方向。     

水性可剥离涂料的制备和性能

以tm803聚氨酯乳液为基体,以BYK-151为润湿分散剂、BYK-011为消泡剂、BYK-333为流平剂、BYK-425为增稠剂,以纳米碳酸钙为填料,制备出一种新型水性可剥离防护涂料。讨论了纳米碳酸钙用量及涂层厚度对涂膜拉伸和断裂性能的影响,研究了放置时间对涂层力学性能的影响。性能测试表明,当纳米碳酸钙的加入量为2%,涂层厚度为0.13～0.14mm时,涂层平均拉伸强度达9.51MPa,平均断裂伸长率达274.54%,具有较好的可剥离性能。涂装7天后,放置时间对涂层性能影响很小,涂层平均拉伸强度及平均断裂伸长率基本不变,因此可使用该涂料对设备进行长期封存防护。     

偶联剂对氧化铁红粉体的表面改性

目的研究硅烷偶联剂KH-560与钛酸酯偶联剂对氧化铁红粉体的改性效果。方法采用硅烷偶联剂KH-560与钛酸酯偶联剂对超细氧化铁红粉体进行改性,同时与未改性的粉体进行比较,对比研究粉体的亲油化度、吸油值、粒度分布、疏水性及分散情况。结果改性后,氧化铁红粉体的细化程度、团聚状况都有一定的改善。粉体由改性前的亲水性变为亲油性,在有机体系中的分散性能得到了提高。结论硅烷偶联剂KH-560与钛酸酯偶联剂都能有效改善铁红粉体的表面性能,而钛酸酯偶联剂的改性效果优于KH-560。     

表面接枝含氟树脂改性HGB的制备及性能研究

目的对中空玻璃微珠(HGB)进行表面接枝含氟树脂改性,以其为填料制备含氟树脂涂料,并进行性能研究。方法将中空玻璃微珠分别经NaOH溶液、硅烷偶联剂KH550、HDI三聚体、含氟树脂处理,并通过FTIR、SEM、EDS等表征手段对接枝情况进行验证。以制备的表面接枝含氟树脂HGB(F-HGB)为填料,制备了含氟树脂隔热涂料,研究了HGB改性温度、时间对F-HGB接触角的影响,以及HGB粒径、添加量、改性、涂层厚度对涂料的疏水性能、隔热性能、拉伸强度的影响。结果成功制备出F-HGB,50℃下接枝含氟树脂反应8h,F-HGB与纯水的静态接触角为149.21°。与HGB/含氟树脂涂料相比,F-HGB/含氟树脂涂料的疏水性能、隔热性能、拉伸强度均有较大幅度的提高和改善。当F-IM16K添加量为20 phr时,F-HGB/含氟树脂涂层与水的接触角为100°,模拟曝晒实验涂层试板温差为7.4℃,拉伸强度为10.39 MPa。当F-K1添加量为20 phr时,F-HGB/含氟树脂涂层的导热系数为0.0701 W/(m·K),同时涂层隔热性能随HGB粒径、添加量的增大而增强,拉伸强度随之降低,但表面改性能有效减小涂料拉伸强度的降低幅度。结论 F-HGB具有疏水、隔热、与含氟树脂相容性好的特点,可作为功能填料制备疏水、隔热、力学性能优良的多功能涂料。     

反射型蓝色隔热节能涂层的制备及隔热性能

目的 针对目前广泛应用的传统型保温隔热建筑材料存在的施工困难、体系过厚、装饰性安全性较差等不足,制备力学性能和装饰性优异的隔热节能涂层。方法 使用KH560对硅溶胶进行改性,与苯丙乳液进行复合制备隔热节能涂料的成膜基料,加入质量分数分别为5%、10%、15%、20%的群青、钴蓝颜浆,制备8种隔热节能涂层。采用傅里叶红外变换光谱仪、马尔文Zeta电位仪、扫描电镜和热重分析仪分别对硅溶胶的接枝改性效果、粒径分布、微观形貌及热稳定性进行测试。采用扫描电镜、X射线衍射仪、电子探针分别对2种颜料的微观形貌、晶体特性和元素组成进行分析。采用紫外/可见/近红外分光光度计测试2种蓝色颜料和节能涂层的太阳光反射比和近红外反射比。采用红外热像仪对涂层试板隔热性能进行测试。采用多种涂层力学测试工具和扫描电镜分别对涂层的综合力学性能、微观形貌进行表征。结果 KH560对无机硅溶胶改性效果较好,可以显著降低硅溶胶的团聚,提升硅溶胶的热稳定性及其在有机乳液的分散性。群青和钴蓝颜料的添加量为5%时,2种涂层的节能隔热效果达到最优。添加量为5%群青的涂层的太阳光反射比、近红外反射比分别为0.462、0.533,添加量...     

新型的治疗阿尔茨海默氏症药物(1-二甲基磷酰基-2,2,2-三氯)-乙基-1-醇烟酸醋对体外神经细胞的作用

目的: 观察本实验室合成的一种治疗阿尔茨海默氏症(AD)的药物(1-二甲基磷酰基-2, 2, 2 -三氯)-乙基^-1-醇烟酸醋(NMF),对体外培养的皮层神经细胞活性的影响以及对海人藻酸(KA)所致的神经损伤的保护作用。方法: 采用体外培养皮层神经元的方法,解剖分离 15 d胚胎小鼠皮层神经细胞, 接种于 96孔板,48 h 后加药并培养 72 h,以 MIT 法 观察 NMF 对小鼠皮层神经细胞活性的影响;同时将接种于 24 孔板的细胞预先给予 NMF,d 3 时加或不加KA处理后,以台盼蓝染色鉴别并计数死、活细胞,可得出细胞的存活率。结果: NMF 明显促进胎鼠皮层神经元活性,其中 NMF1、0. 1、10nmol·L^-1促进神经元活性增殖率分别高达 34.7%、37.4%、36. 7%, NMF 明显促进正常胎鼠皮层神经元存活卒,与对照组比较,10nmol·L^-1 NMF 对皮层神经元的存活率分别提高 39.3%、73.5%。 NMF能显著 对抗 KA 所致的神经元损伤,与 KA 损伤组相比, NMF0.1、10、10nmol·L^-1对损伤皮层神经元的保护率分别为 77.30%、80.10%、84.15%。结论: NMF 明 显促进胎鼠皮层神经元的洁性、提高正常皮层神经元,的存活卒,并能有效地保护KA所致的神经元损伤,提示 NMF 是一种很有潜力的治疗 AD 的药物。     

Three-Dimensional Growth of Coherent Ferrite in Austenite: A Molecular Dynamics Study

Coherent second phase often exhibits anisotropic morphology with specifi c orientations with respect to both the second and the matrix phases. As a key feature of microstructure, the morphology of the coherent particles is essential for understanding the second-phase strengthening eff ect in various industrial alloys. This letter reports anisotropic growth of coherent ferrite from austenite matrix in pure iron based on molecular dynamics simulation. We found that the ferrite grain tends to grow into an elongated plate-like shape, independent of its initial confi guration. The fi nal shape of the ferrite is closely related to the misfi t between the two phases, with the longest direction and the broad facet of the plate being, respectively, consistent with the best matching direction and the best matching plane calculated via the Burgers vector content(BVC) method. The strain energy calculation in the framework of Eshelby's inclusion theory verifi es that the simulated orientation of the coherent ferrite is energetically favorable. It is anticipated that the BVC method will be applicable in analysis of anisotropic growth and morphology of coherent second phase in other phase transformation systems.     

Effect of Short-Time Aging on the Pitting Corrosion Behavior of a Novel Lean Duplex Stainless Steel 2002

The effect of short-time aging in the temperature range between 400 and 1000 °C on the pitting corrosion behavior and mechanical property of a novel lean duplex stainless steel(LDSS) 2002 was investigated through the potentiostatic critical pitting temperature(CPT) tests and the Charpy impact tests. Both the pitting corrosion resistance and the toughness of aged specimens degraded due to the precipitation of detrimental secondary phases and the most significant reduction of CPT and impact energy emerged at 650 °C concurrently. The CPT of LDSS 2002 specimen aged at 650 °C decreased by 28 °C, and the impact energy dropped from 69 to 29 J/cm~2 compared with the solution-annealed sample. Transmission electron microscopy characterization showed that the main precipitates in LDSS 2002 were Cr_2N and M_(23)C_6 along the ferrite–austenite grain boundaries.     

INTRODUCTION TO PATENTS

The invention provides a method of making a mold which can reduce SOx generation rate while preventing decrease in hardening rate in the case of using sulfuric acid for a hardener composition. The method has a mixture step in which fire-resistant particles, a hardener composition and a binder composition are mixed to obtain a composition for a mold. The hardener composition contains sulfuric acid. In the mixture step, sodium carbonate is added. A molar ratio of the sulfuric acid to the sodium carbonate is 0.5 or more and 4.0 or less.     

China Foundry Week 2014

China Foundry Week, hosted by the Foundry Institution of Chinese Mechanical Engineering Society （FICMES） each year, is a large academic event in China. It is one of the ten high-impact activities sponsored by the Chinese Mechanical Engineering Society.     

17th Conference of Hydrodynamic and Electromechanical Control Engineering Call for papers

正1.Contents In order to promote the academic exchanges and technical communication of the research in the field of fluid power transmission and control,fluid control engineering specialized committee of the Chinese Society of Theoretical and Applied Mechanics will hold the 17th Conference of Hydrodynamic and Electromechanical Control Engineering on July 27-29,2014 in Tibet,Lhasa city.     

Information for Contributors

正The Transactions of Nonferrous Metals Society of China,founded in 1991 and sponsored by The Nonferrous Metals Society of China,is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology,including mineral processing,extraction metallurgy,metallic materials and heat treatments,metal working,physical metallurgy,powder metallurgy,with the emphasis     

Preface

<正>We are pleased to present this Special Issue of Transactions of Nonferrous Metals Society of China containing selected papers from the First Asian Conference on Aluminum Alloys(ACAA-2013),held in Beijing,China,13–17 October 2013.This conference has been initiated,with approval of     

Information for Contributors

The Transactions of Nonferrous Metals Society of China, founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, 1NSPEC, CA, METADEX, AJ and JICST.     

Rheology Feature of Simple Metal Melt

The rheology feature of Sb, Bi melt and alloys was studied using coaxial cylinder high-temperature viscometer. The results showed that the curve of torsion-rotational speed for Sb melt presents a linear relation in all measured temperature ranges, whereas for the Bi melt, the curve presents obvious non-Newtonian feature within the low temperature range and at relative high shear stress. The rheology feature of Sb80Bi20 and Sb20Bi80 alloy melts was well correlated with that of Sb and Bi, respectively. It is considered that the rheology behavior of Sb melt plays a crucial role in Sb80Bi20 alloy and that of Bi melt plays a crucial role in Sb20Bi80 alloy.