Synthesis and Properties of Perfluorinated Alkyl Silicone Oil Modified Epoxy Resin

Perfluorinated alkyl silicone oil （PFASO） was successfully synthesized from N-ethyl-N- hydroxylethyl perfluorinated octane sulfonamide, succinie anhydride and amino silicone oil by esterification and amide reaction at moderate temperature in the presence of different catalysts. The chemical structure of the synthesized samples was characterized by Fourier transform infrared spectroscopy （FT-IR）, the relative molecular mass（MM） and molecular mass distribution（MMD） of PFASO were tested by gel filtration chromatography（GFC）. A commercial epoxy resin （DGEBA） was modified with PFASO, with the content of PFASO 1-5 phr. Thermo-gravimetric analysis （TGA）, impact tests, scanning electron microscope （SEM） and water contact angle test were applied to provide accurate results on the thermal stability, toughness and hydrophobicity of PFASO/epoxy complex. The experimental results reveal that epoxy resins can be successfully modified by adding a small amount of as-synthesized modifiers via simple direct mixing, and verify that the as-synthesized modifier can improve the toughness and hydrophobicity of epoxy resin without sacrificing its thermal properties.

A Boron-based Adhesion Aid for Efficient Bonding of Silicone Rubber and Epoxy Resin

We improved the adhesion between silicon based insulating materials and epoxy resin composites by adding the adhesion promoter cycloborosiloxane(BSi,cyclo-1,3,3,5,7,7-hexaphenyl-1,5-diboro-3,7-disiloxane).The experimental results show that the addition of BSi in the silicone rubber(SR)system significantly increases the tensile shear strength between BSi and epoxy resin(EP),reaching 309%of the original value.On this basis,the mechanism of BSi to enhance the adhesion effect was discussed.The electron deficient B in BSi attracted the electron rich N and O in EP to enhance the chemical interaction,combined with the interfacial migration behavior in the curing process,to improve the adhesion strength.This study provides the design and synthesis ideas of adhesive aids,and a reference for further exploring the interface mechanism of epoxy resin matrix composites.

MLA-Based Detection of Organic Matter with Iodized Epoxy Resin—An Alternative to Carnauba

Solid organic matter is an important constituent not only in coal, but also in black shale-hosted ore deposits. The reliable recognition and quantification of organic carbon—as well as its microfabric relation to associated inorganic minerals—plays a crucial role in characterization by scanning electron microscopy-based image analysis. However, the use of conventional epoxy resin in the preparation of grain mounts does not allow for recognition of solid organic carbon compounds. In this study we illustrate that the use of iodized epoxy resin readily overcomes this bottleneck. Best results are obtained with an addition of 15 wt% iodoform to the epoxy resin. With process samples of black shale-hosted polymetallic Kupferschiefer-type ore as a case study, it is shown that recognition and quantification of solid organic carbon are easily achieved and that tangible parameters such as particle and grain sizes, association and liberation for ore and gangue minerals can be determined in the presence of solid organic matter. Due to the inherent uncertainty of the exact chemical composition of the kerogen contained in Kupferschiefer, it was not possible to attain exact comparability between chemical Corg assays and assays calculated from MLA data. However, the results are still found to closely agree with one another. The strength of iodized resin lies in its ability to distinguish organic matter with high hydration ratios in addition to the easy integration in sample preparation. It could therefore be an attractive supplement in the analyses of other raw materials containing complex organic-matter.

Development of Siliconized Epoxy Resins and Their Application as Anticorrosive Coatings

The present work involves the development of siliconized epoxy resin to overcome the drawback of epoxy resin like poor impact strength, high rigidity and moisture absorbing nature because of which they are not applied as corrosion resistant coating. By embedding silicone into the back bone of polymeric resin the above drawback can be reduced to substantial level. For achieving this, siliconised epoxy resins were prepared by reacting amine terminated silicone resin with novolac epoxy resin and meta-phenylenediamine was used as curing agent. The applied films of coating were baked at 150oC. Cured films were evaluated for their thermal, mechanical, chemical and corrosion resistance properties to ascertain the commercial utility of these eco-friendly resin for use in anti corrosive formulations. The siliconized epoxy resins system was found to exhibit good thermal and anticorrosive properties.

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.

Influence of aliphatic epoxy monomer on the blowing-out effect in the flame retardant epoxy resins

An aliphatic epoxy monomer＂polypropyleneglycol-diglycidylether（PPGDGE,YF878）＂is loaded in the epoxy resins（EP）to evaluate the influence of epoxy structure on the blowing-out effect,which is caused by 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide（DOPO）and octaphenyl silsesquioxane（OPS）.The flame retarding properties of these EP composites were tested using the LOI and UL-94 procedures.The pyrolytic gases produced and the thermal stability of the EP composites with different flame retardants were detected by TGA-FTIR in air.The negative effect of YF878 was detected from the TTI,HRR,and p-HRR results after the cone calorimeter test.The char produced by the EP composites after the cone calorimeter test was investigated by FTIR.It is proposed that the aliphatic chain of the YF878 is easy to break down and produce combustible gases,so it does not easily form a crosslinked structure in the condensed phase.These results are very helpful for investigation of the conditions under which the blowing-out effect in epoxy resins can be caused by synergy of phosphorous and silicon.

GO/ZIF-67/水性环氧复合涂层的制备及防腐性能

针对氧化石墨烯(GO)无自修复性能和沸石类金属有机框架(MOFs)聚合物的腐蚀介质屏蔽性能较弱等实际问题,将具有主被动协同防腐作用的GO/MOFs复合纳米颗粒作为防腐填料,加到水性环氧树脂涂层(WEP)中从而提升防腐性能。通过微观形貌观察、电化学阻抗谱(EIS)测试和盐水浸泡实验对涂层的附着力和防腐性能进行评价。结果表明:复合纳米涂层的吸水率比纯WEP涂层降低6%。在3.5%盐水中浸泡7 d后,复合纳米填料的添加量达到0.3%时,复合涂层的阻抗模量仍能保持1.9×10^(8)Ω·cm^(2),表现出优异的防腐性能。

高厚径比印刷线路板环氧树脂塞孔油墨的制备及应用

为了实现高厚径比印刷线路板(PCB)树脂塞孔的同时并保证油墨的性能,本文以环氧树脂为基体,改性后的微米/纳米SiO_(2)为填料,搭配固化剂甲基六氢苯酐和其他助剂在特定工艺条件下制成塞孔油墨。利用差示扫描量热法(DSC)确定油墨的固化工艺参数;红外光谱(FT-IR)对改性前后的SiO_(2)进行表征分析;通过热膨胀测试(CTE)、拉伸强度测试、树脂塞孔测试,研究不同粒径填料添加比例对油墨性能的影响,确定油墨的最佳配方。结果表明:本实验制备的W/N70-30油墨的热膨胀系数和拉伸强度比油墨产品PHP-3F-DS和PHP-900好;塞孔后发现5 mm的PCB板上0.13 mm和0.15 mm孔径的通孔背面都呈现出油现象,其塞孔效果最好,因此本实验制备的W/N70-30油墨能够应用于高厚径比(40:1)印刷线路板。

互穿网络结构的二氧化硅/环氧树脂复合材料的制备及介电性能研究

环氧树脂(EP)具有较高的电绝缘性能和较低的介电损耗,因此被广泛应用于电气设备和电子封装等绝缘材料领域。由于传统EP耐热性能较差、韧性不足,极大限制了其作为微电子元器件在高频电场下的使用。本工作以硅烷偶联剂(3-环氧乙基甲氧基丙基)三甲氧基硅烷(KH-560)和正硅酸乙酯(TEOS)为原料,通过溶胶-凝胶法合成末端含有环氧基团的新型端环氧基纳米SiO_(2)(E-SiO_(2)),用其对E-51型EP进行改性,在固化剂作用下使E-SiO_(2)和EP上的环氧基团发生开环反应,通过有机EP与无机E-SiO_(2)填料之间的化学键结合,制备出具有互穿网络结构的E-SiO_(2)/EP复合材料。本工作研究了添加E-SiO_(2)对EP固化反应工艺和综合性能的影响,以期在保证EP低介电常数和低介电损耗的同时,赋予其良好的韧性和耐热性能,为EP在高频电路下的应用奠定基础。

焦磷酸哌嗪@COF阻燃剂的制备及其对环氧树脂的阻燃作用

通过溶液合成法制备了一种共价有机框架(COF),再将COF包覆在焦磷酸哌嗪(PAPP)上形成PAPP@COF杂化阻燃剂,并将其应用于EP中。通过氧指数测定仪、垂直燃烧测定仪和锥形量热仪分析了PAPP@COF杂化阻燃剂对EP的阻燃及消烟性能的影响。结果表明,加入2%(质量分数,下同)的PAPP@COF时,EP复合材料的氧指数达到了30.0%,热释放速率峰值为911.35 k W/m^(2),烟释放速率峰值为0.394 m^(2)/s,相比于纯EP分别降低了37.36%和34.27%。PAPP@COF杂化阻燃剂对EP有优异的阻燃和消烟作用,为COF类阻燃剂的研究提供了一定的基础。

水性丙烯酸涂层改性研究进展

简单阐述了水性丙烯酸树脂的单体结构、聚合方法以及应用现状;较为系统地总结了根据不同材料改性水性丙烯酸树脂的研究进展,改性材料可归纳为纳米材料、有机硅、有机氟、聚氨酯和环氧树脂以及一些新型材料等。重点论述了改性材料对水性丙烯酸树脂进行改性的反应机理、相应的微观结构及性能提高情况。展望了水性丙烯酸涂料发展的方向。

水性有机硅改性环氧树脂的制备与性能

利用二甲基二氯硅烷(DMDCS)与环氧树脂E51中-OH缩合反应合成有机硅改性环氧树脂,并采用相反转法制备水性有机硅改性环氧树脂,以疏水性优选有机硅改性环氧树脂合成条件,分析了乳化工艺对乳液平均粒径的影响,并考察了固化膜性能。结果表明,在环氧树脂40 g、DMDCS 1.6 g、溶剂用量20 mL、50℃反应8 h的条件下,有机硅改性环氧树脂与水的接触角为106.8°;当乳化剂用量为25%、乳化温度为65℃、剪切机转速为3000 r/min时,乳液平均粒径为1.011μm,储存稳定性(30 d)和离心稳定性(3000 r/min,30 min)良好;水性有机硅改性环氧固化膜固化时间短,具有优良的疏水性、力学性能、耐腐蚀性能。

有机硅改性环氧树脂的合成及其清漆涂层的防腐性能研究

将自制的反应性甲基苯基硅树脂(RMPSR)和双酚A型环氧树脂(E-51)在二甲苯中混合均匀,并在高温下使RMPSR分子上的活性甲氧基与E-51树脂主链上的羟基发生缩合反应,制得甲基苯基硅树脂改性环氧树脂。在改性树脂中加入脂环族胺类固化剂4,4′-二氨基二环己基甲烷,将其涂布在马口铁上热固化,制得透明的清漆涂层。采用红外光谱和核磁共振氢谱对改性树脂的化学结构进行表征,使用电化学工作站和盐雾箱研究涂层的防腐性能。结果表明,有机硅树脂的引入明显提升了涂层的防腐性能,其中ER-20在50 g/L的NaOH溶液中浸泡240 h后涂层表面仅有微小气泡产生,相较于E-51,其耐醇性能无明显下降,且阻抗模值、容抗弧以及极化电阻明显增大。改性树脂涂层的耐盐雾和耐盐溶液性能也有显著提升,即使在腐蚀介质中浸泡480 h后,其阻抗模值仍能达到2.63×10^(7)Ω·cm^(2)(而此阶段E-51阻抗模值仅为10^(3)数量级),表现出良好的电化学防腐蚀性能。

金属有机框架基阻燃剂在阻燃领域的研究进展

简述了近几年来金属有机框架(MOFs)及其衍生物在阻燃高分子材料领域的应用,重点介绍了MOFs阻燃剂的设计及其对环氧树脂(EP)、聚苯乙烯(PS)、聚氨酯等材料阻燃性能的影响,阐述了可能存在的阻燃机理,并对MOFs阻燃剂未来的发展方向进行了展望。

环氧树脂掺杂对地质聚合物木材胶黏剂性能的影响

【目的】为了解决地质聚合物木材胶黏剂的界面相容性差等问题,采用环氧树脂为有机掺杂剂构建有机–无机交联网络的方法,研究环氧树脂掺杂对地质聚合物木材胶黏剂综合性能的影响。【方法】将地质聚合物与环氧树脂、聚醚胺、硅烷偶联剂KH550共混制备地质聚合物基木材胶黏剂,分析不同有机掺杂剂对胶黏剂性能的影响作用,结合FTIR、XPS、SEM-EDS和锥形量热仪等分析有机掺杂剂的作用机制。【结果】不同有机物掺杂均会提高地质聚合物浆体的黏度,当环氧树脂和聚醚胺的质量分数分别为4.8%和1.2%(GECS6)时,地质聚合物浆体黏度较低,有利于均匀施胶。不同物质掺杂均会不同程度地提高地质聚合物基胶合板的胶合强度,GECS6的湿态胶合强度达到较优值0.87 MPa,相比于纯地质聚合物胶黏剂提高了248%。相较于纯地质聚合物,有机掺杂地质聚合物胶合板的热释放速率和总热释放量分别下降了7.01%和17.95%,阻燃性能得到一定程度的提高。【结论】环氧树脂与硅烷偶联剂协同作用,构建了有机–无机交联网络,提高了地质聚合物胶黏剂与木材的相容性及浆体的致密性,解决了地质聚合物木材胶黏剂的界面相容性差的问题,从而增强了胶合板的胶合强度和阻燃性能。

酚醛/环氧树脂凝胶注模成型制备反应烧结碳化硅

为了探究一种低成本、环保的反应烧结碳化硅材料成型方法,以SiC细粉和微粉、酚醛树脂和环氧树脂为主要原料,四甲基氢氧化铵为分散剂,配制固相质量分数为55%,酚醛树脂质量分数分别为13.5%、18%、22.5%及27%的SiC陶瓷泥浆,采用凝胶注模成型制成坯体,坯体经固化、800℃保温2 h热处理后,在真空条件下1760℃保温3 h制备反应烧结碳化硅材料。研究了坯体的固化机制及酚醛树脂加入量对试样显微结构、物相组成和物理性能的影响。结果表明:1)坯体固化机制为酚醛/环氧树脂中羟甲基与芳环的邻对位氢发生缩合反应交联,形成了较高强度的结合网络。2)随着酚醛树脂加入量的增加,树脂体系裂解残碳与熔融硅反应,烧后试样的常温抗折强度先增加然后降低。当酚醛树脂加入量为18%(w)时,烧后试样常温抗折强度最高,为79.9 MPa,此时试样的显气孔率和体积密度分别为1.1%、2.88 g·cm^(-3)。

六钛酸钾晶须改性环氧有机硅树脂的抗烧蚀性能

制备了六钛酸钾晶须(PHW)改性的环氧有机硅树脂复合材料,研究了PHW含量对复合材料在氧-乙炔烧蚀环境中抗烧蚀性能的影响。结果表明:添加PHW能够有效提高环氧有机硅树脂烧蚀产物层的抗剥落能力和耐高温烧蚀性能,其中PHW添加量为20wt%时,复合材料的线烧蚀率和质量烧蚀率均最低,分别为0.136 mm/s和1.143 g/s,与环氧有机硅树脂相比分别低约53.74%和47.04%;当PHW含量超过20wt%后,进一步增加其含量对复合材料耐烧蚀性能的改善效果不再明显。TG分析结果表明:添加PHW能大幅降低环氧有机硅树脂的失重率,其中PHW添加量为20wt%时,复合材料的失重率约为38.57%,较环氧有机硅树脂低约19.89%;当PHW含量高于20wt%后,进一步增加其在复合材料中的含量对失重率的改善效果不再明显。

有机硅及钛酸酯改性碳纤维树脂基复合材料力学性能研究

为了增韧纯环氧树脂基碳纤维复合材料,改善其力学性能,采用VARTM成型工艺制备有机硅改性碳纤维树脂基复合材料,使用傅里叶红外光谱仪、电子万能试验机、落锤式冲击试验机和SEM研究了改性后的环氧树脂官能团和化学键以及复合材料的拉伸、弯曲、冲击性能,并对其断口进行分析。结果表明:当有机硅质量分数为2%,钛酸酯偶联剂添加质量分数为0.4%时,复合材料的各项力学性能达到最佳,拉伸强度为751.55 MPa,提高了111.4%;弯曲强度为1023.64 MPa,相比未改性的复合材料提高了69.6%;冲击韧性为88.51 kJ·m^(-2),比纯环氧树脂碳纤维复合材料提高了61.3%。

环境友好型干式变压器用绝缘材料的发展与面临挑战

目前干式变压器用绝缘材料存在不可降解、难以回收利用等问题,与我国经济社会的“绿色”“低碳”发展战略目标相矛盾,亟需开展环境友好型干式变压器的研发与应用。为了解决这一问题,研究人员正在探索2种主要的技术路线:一是开发可降解回收的环氧树脂,尽管需要克服性能和热稳定性的挑战,但通过分子结构的创新设计,有潜力提升其应用性能;二是使用硅橡胶等可降解材料作为替代品,硅橡胶因其优异的耐温性、绝缘性和可回收性而成为有前景的选择,尽管其电气和机械性能需要进一步增强以满足工业需求。目前,硅橡胶在干式变压器中的应用研究还不够充分,特别是其长期运行的可靠性和耐久性仍需验证。展望未来,环境友好型干式变压器的研发将集中在开发安全、稳定、长寿命的材料,并提高其可回收性,以更好地符合我国的发展战略。实验室条件下虽然已经实现了材料的降解回收,但在实际应用中,性能和效率的提升仍然是关键;因此,优化回收技术、降低成本、提高回收效率将是电工绝缘材料领域可持续发展的关键方向。

高光泽高防腐水性汽车涂料的制备与性能

[目的]传统溶剂型汽车漆VOC(挥发性有机物)含量高,而现有的汽车用水性涂料耐老化性和耐蚀性较差。[方法]以有机硅改性水性环氧树脂为成膜材料,通过添加固化剂、功能颜填料、防锈剂等辅料,制备了一种高光泽高防腐水性汽车涂料,并讨论了各种原辅料的用量对涂料性能的影响。[结果]所制水性汽车涂料的表干时间为45 min,附着力0级,铅笔硬度达到HB,耐盐雾腐蚀时间在4000 h以上,老化3000 h后的保光率为87%,能通过240 h的耐水性测试,且VOC含量低至56.5 g/L。[结论]该涂料符合汽车用水性涂料标准(HG/T 4570-2013)的要求。