铜系电磁屏蔽涂料的制备及导电性能研究

采用醇酸树脂为基料,金属铜粉为导电填料以及溶剂和助剂,研制成电磁屏蔽导电涂料;讨论了铜粉粒度、偶联剂含量、涂层厚度以及不同树脂对涂料导电性能的影响,通过分析涂层的导电机理,探讨了因素。     

铜系复合涂料导电稳定性的研究

本文研究了硅烷偶联剂对电磁屏蔽用铜系导电复合涂料导电稳定性的影响,结果表明,由于偶联剂在铜粉表面可形成隔绝空气的保护膜,导电涂料的导电性能及导电稳定性均得到显著的提高,当偶联剂的含量为铜粉含量的３％（质量分数）时达到最佳值。     

高导电性铜基复合导电涂料的研制

为了制备综合性能优良的铜系复合导电涂料,以自制的配合剂A处理后的铜粉为原料,研究了固化剂类型、铜粉用量及性能、涂料制备工艺等对铜-环氧复合导电涂料性能的影响.结果表明,配方中加入防氧化剂可以有效抑制铜粉在涂层制备过程中的氧化现象.较优的涂料配方(质量比)为:E-51环氧树酯50份,聚酰胺50份,400目铜粉300份,钛酸酯偶联剂2～3份,防氧化剂20～40份,有机膨润土防沉剂2～3份.制得的复合导电涂层具有较好的综合性能,涂层平均表面电阻率约为2.0×10-2Ω/cm2且可保持30 d无变化.     

低温铜电子浆料的制备及性能研究

以铜粉、环氧树脂及固化剂、偶联剂为原料,经过铜粉表面的改性处理、均匀混合和涂覆工艺,制备了低温铜电子浆料。用XRD、SEM、TG、金相显微镜和LCR电桥测试仪对制备的铜电子浆料进行了微观组织的表征和性能测定。结果表明:经偶联剂处理过的粉体与树脂的相容性提高;铜粉含量小于90%时,浆料能获得较好的附着力;有机物包覆使铜粉的抗氧化性提升;当铜粉含量为80%~90%时,表现较低的电阻,可形成良好的导电通路;250℃以下时,铜粉电子浆料的热稳定性较好。     

工艺参数对浅色复合导电涂料导电性能的影响

利用导电云母粉与醇酸树脂复合制备了一种浅色复合导电涂料,讨论了导电填料含量、偶联剂种类及含量、固化工艺以及涂层厚度等工艺参数对涂料导电性能的影响.结果表明,加入60%～65%导电云母粉,钛酸酯偶联剂NTG401用量为5%,涂层在50℃条件下烘烤2d,涂层厚度在120μm左右,涂料的导电性能较好,表面电阻率达到103Ω·cm-2.     

铜粉电子浆料的老化性能

为了研究铜电子浆料的老化性能,本文以铜粉、环氧树脂、固化剂及偶联剂为原料,采用共混法制备了低温固化类铜粉电子浆料,借助XRD、SEM和LCR数字电桥对其进行表征和性能测定。结果表明:经偶联剂包覆处理后铜粉的分散性得到提高,导电浆料在自然老化条件下放置180天时电阻值最大为33.8Ω,室温氧化60天后质量仅增重1.32%×10-3。因此,制备的低温铜粉电子浆料具有较好的热稳定性、抗氧化性及可靠性。     

碳纤维体系导电涂料的制备工艺

研制了一种以丙烯酸酯类树脂为基料的改性碳纤维体系导电涂料.用单因素方法确定改性碳纤维/树脂质量比,偶联剂的种类、用量以及添加方式、涂料的固化工艺等方面对涂料电性能的影响关系,然后用正交实验进一步优化各因素对涂膜导电性能的影响,确定了制备碳纤维体系导电涂料的最佳工艺条件为:改性碳纤维/树脂质量比为0,7,钛酸酯偶联剂TMC-102采用预处理用量为1%(wt,下同)和直接加入用量为1.5%相结合,制得的导电涂料综合性能较好;固化温度为50℃下固化20min,涂膜厚度为150μm时,其表面电阻率达到1.02Ω/sq.     

铜系复合涂料的制备及导电性能

采用醇酸树脂为基料 ,金属铜粉和金属纤维为导电填料以及溶剂和助剂 ,研制成电磁屏蔽导电涂料 ;讨论了铜粉和金属纤维的含量以及固化工艺对涂料导电性能的影响 ,并通过涂层的导电机理 ,探讨了造成这些影响的原因     

偶联剂对铜系复合涂料导电稳定性的影响

采用硅烷偶联剂对铜粉进行处理, 使导电涂料的电阻率降低一个数量级, 并且经500 小时的耐候性实验, 电阻率保持稳定。研究了偶联剂对铜粉氧化的抑制作用机理。红外光谱(FT IR)表明, 偶联剂可以和铜粉表面以氢键、共价键结合, 形成一层保护膜防止铜粉氧化。      

以铜粉为填料的导电粘合剂的研制

随着电子工业的发展,导电粘合剂的应用也日益广泛。目前国内外使用的导电粘合剂主要是以银粉为填料、合成树脂为粘合剂的复合型导电粘合剂。这种导电粘合剂形成的胶层、虽有化学稳定性好,导电性能优异等优点,但价格昂贵,银原子容易产生迁移,因此应用范围受到了一定的限制。近几年来,日本和欧美各国正在大力发展以铜粉为填料的导电粘合剂。本文介绍了以铜粉为填料的导电粘合剂的配制、性能、以及影响电导率和粘结强度的因素。本粘合剂由电解铜粉、环氧树脂以及固化剂、抗氧剂、偶联剂等按不同比例配制而成。具有成本低、导电性能好、粘结强度高等特点,适用于对铝、铜、玻璃、陶瓷以及酚醛一环氧玻璃布层压板等材料的粘接。由于在粘合剂中加有适量的抗氧剂和偶联剂,克服了铜粉易氧化的缺点,从而提高了导电粘合剂的稳定性并对导电性能有所改善。在研制过程中,并应用红外光谱分析、X—射线广角衍射等对粘合剂的结构进行了初步探讨。结果表明、以铜粉为填料的导电粘合剂具有导电性好、性能稳定、成本低等优点。其体积电阻系数为10~(-3)～10~(-4)Ω—cm,抗剪强度达85kg/cm~2,成本仅为以银粉为填料的导电粘合剂的4％左右。由于以铜粉为填料的导电粘合剂较以银粉为填料的导电粘合剂的成本大大降低,而且综合性能良好,因而具有广阔的应用前景。     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

Brainstorming for ISO Strategy 2016-2020

正Responding to ISO’s appeal for survey for the to-be-developed ISO Strategy Plan for 2016-2020,SAC hosted a special workshop over the needs and comments of various fi elds on June 8 in Beijing.The workshop was attended by ISO President-elect and Ansteel General Manager Zhang Xiaogang,SAC Vice-Administrator Yu Xinli,and 30 experts from     

CNAS Passes APLAC's PTP Review

正The review group of Asia Pacific Laboratory Accreditation Cooperation(APLAC)carried out a 4-day peer review of the proficiency testing provider(PTP)for China National Accreditation Service for Conformity Assessment(CNAS)from July 28 to 31,2014.CNAS passed the PTP review with excellent performance.Two senior peer reviewers of APLAC made a comprehensive,rigorous and detailed review of CNAS’s PTP accreditation activities,and made the on-spot inspection of the review groups in Shanghai and Shenzhen respectively.     

新闻(英文)

正China and Greece Sign the Standardization Cooperation Agreement Witnessed by Chinese Premier Li Keqiang and Greek Prime Minister Antonis Samaras,AQSIQ Minister Zhi Shuping and ELOT Chairman and Executive Director Angelos Tolkas signed the SAC-ELOT Standardization Cooperation Agreement.The Agreement is one of the critical cooperation documents signed during Li Keqiang’s visit in Greece,encouraging China and Greece to     

Win-Win Cooperation

正The Chinese Premier Li Keqiang's recent trip to the UK has reinforced the China-UK comprehensive strategic partnership;just as the British Prime Minister David Cameron put it,"the relationship is gaining in strength,depth and understanding"after a bucket of business deals being inked worth more than 30 billion US dollars.From the first agreement signing in 2004 to the new agreement of mutual standards recognition and adoption in     

Systematic Approach for Emerging Industry

正A national directory of standards complexes for strategic emerging sectors was recently developed and released jointly by 12governmental departments,namely,SAC,NDRC,MOST,MIIT,MEP,MOA,AQSIQ,State Forest Administration,State Administration of Science and Technology for National Defense,State Oceanic Administration and National Railway Administration.     

Strictest Pollutants Emission Standards

正Four new national standards on air pollutant emission control offi cially issued by the Ministry of Environment Protection(MEP)together with AQSIQ and SAC has been brought into force from July 1,2014.The Emission standard for air pollutants of coal-burning,oil-burning and gasfi red boilers,which is the strictest emission standard historically,will tackle the stubborn pollution problem of boilers and waste incineration in most of China’s regions.     

Instructions to Authors

New Carbon Materials is a bimonthly journal published with the permission of the Ministry of Science and Technology and of the State News and Publication Agency.The journal is sponsored by the Institute of Coal Chemistry,Chinese Academy of Sciences,and is published by Science Press.Aims and Scope     

Progress on Standards Copyright Protection

正Recently,National Copyright Administration of China(NCAC)has rewarded 215 organizations and 179 individuals for their outstanding efforts on investigating standards copyright infringement and piracy in 2013.Hua Jianhua,the Deputy-Director of National Standards Copyright Protection Workgroup Office won a third prize of the national individual award.In 2012,SAC set up the national standards copyright protection working group,and developed policies to crack down standards infringement and piracy behaviors and to strengthen standards copyright protection.