ESO-ADA中间体的制备及其在UV固化丙烯酸酯压敏胶中的应用
王 磊1，林晓丹1，陈柯宇1，廖平湘2
(1.华南理工大学材料科学与工程学院，广东广州 510641；2.湖南省和祥润新材料有限公司，湖南永州 266400)
【摘 要】利用环氧大豆油(ESO)和己二酸(ADA)在180 ℃条件下反应制备ESO-ADA中间体。将该中间体作为填充物添加到以丙烯酸异辛酯（2-EHA）为软单体、丙烯酸（AA）为硬单体、丙烯酸羟乙酯（HEA）为功能单体、2-羟基-2-甲基-1-苯基-1-丙酮（1173）为光引发剂的混合液中，混合均匀后涂布于格拉辛纸上，然后覆盖PET离型膜，通过UV光照固化制备压敏胶。通过正交试验优化了配方，并研究了光照时间、AA含量、功能单体含量以及涂胶厚度对压敏胶性能的影响。研究结果表明：当UV光照时间为120 s、ESO-ADA中间体中环氧基与羧基物质的量之比为10∶6且ESO为30份、软单体2-EHA为60份、w(AA)=20%、w(HEA)=3%（均相较于中间体和2-EHA质量之和而言）、涂胶厚度为100 μm时，压敏胶的综合性能相对最佳。其固化完成度高，初粘力为18#号球，180°剥离强度为30.6 N·(25 mm)-1，持粘力超过360 h，水接触角大于90°。
【关键词】环氧大豆油；己二酸；丙烯酸酯；UV固化；压敏胶
EPN纳米橡胶粒子增韧双氰胺环氧树脂及其复合材料性能研究
李亚锋1,2，张杜鹃1,2，鹿海军1,2
（1.中国航空制造技术研究院复合材料技术中心，北京 101300；2.中国航发北京航空材料研究院先进复合材料重点实验室，北京 100095）
【摘 要】采用EPN核壳纳米橡胶粒子对双氰胺固化环氧树脂进行增韧改性。通过傅里叶变换红外光谱(FT-IR)法和扫描电子显微镜(SEM)法表征了EPN的化学结构和表面形貌；使用扫描透射电镜(TEM)表征了EPN粒子在环氧树脂中的分散状态；通过黏度、差示扫描量热分析(DSC)法以及动态热机械分析仪（DMA）表征了EPN粒子对体系流变性能、反应活性以及耐热性的影响；通过树脂浇铸体的冲击强度、复合材料的I型层间断裂韧性（GIC）与冲击后压缩强度（CAI）研究了EPN粒子对树脂及其复合材料韧性的影响。研究结果表明：EPN粒子表面含有大量活性官能团，与环氧树脂间具有良好的相容性，能够以纳米尺寸分散在环氧树脂中；EPN粒子表面的活性官能团能够与环氧树脂反应，添加EPN粒子体系的黏度能够满足材料工艺需求。EPN粒子对环氧树脂具有良好的增韧效果，6%左右的添加量即可使树脂基体的冲击强度达到51 kJ/m2以上，较增韧前提高了130%，同时对体系的Tg无明显影响。复合材料韧性研究结果表明，添加EPN质量分数为6%的复合材料的GIC和CAI 均提高了60%以上，具有显著的增韧效果。
【关键词】环氧树脂；纳米橡胶粒子；核壳粒子；增韧；复合材料
水下表面粘贴用压敏胶的制备
陈 中1，钱 军1，石一峰2
（1.华东理工大学材料科学与工程学院，上海 200237；2.上海宏顶房科技有限公司，上海 200237）
【摘 要】受海洋生物贻贝的启发，预先合成含多巴结构的功能单体（CQS-1），然后将功能单体与丙烯酸丁酯和丙烯酸单体进行自由基溶液共聚，得到丙烯酸酯压敏胶。采用万能拉力试验机，探讨了干燥和潮湿环境下压敏胶的力学性能。研究结果表明：该压敏胶在水下具有优异的稳定性和粘接强度；当CQS-1含量为6%时，经过贴前水下浸泡180 min和贴后水下浸泡1 440 min，压敏胶180°湿贴剥离强度分别可以达到最初的80%和90%以上。
白炭黑增强氟橡胶体系的耐等离子体刻蚀性能研究
张部明1，张天福2，刘增杰3，雷晓宏4，李 涛3，张孝阿1,3，李 伟2，刘 力1
（1.北京化工大学，碳纤维及功能高分子教育部重点实验室，材料科学与工程学院，北京 100029；2.航天化学动力技术重点实验室，湖北航天化学技术研究所，湖北襄阳 441003；3.山东船舶技术研究院，山东威海 264209；4.北京通嘉宏瑞科技有限公司，北京 102600）
【摘 要】以高氟橡胶生胶、白炭黑等为主要原料，制备了过氧化物硫化氟橡胶。研究了体系的硫化特性、力学性能、热稳定性和耐等离子体性能。研究结果表明：白炭黑用量对焦烧时间影响不大，且都具有较好的稳定性。当白炭黑用量为15~20质量份时，力学性能最优，最大拉伸强度和撕裂强度分别为19.8 MPa和36.4 kN/m。添加白炭黑的氟橡胶体系都具有优异的热稳定性和耐等离子体性能，初始分解温度都在405 ℃左右，刻蚀后的重量损失率都在3.4%~3.8%之间，表面变化更加均匀。进一步分析等离子体刻蚀造成的化学变化，在等离子体刻蚀条件下表面的C—F键大大减少，失去F原子屏蔽的主链发生断裂，低分子降解产物和白炭黑“颗粒”都逸出材料表面。
【关键词】氟橡胶；白炭黑；热稳定性；耐等离子体刻蚀性能
石墨烯改性交联型水性聚氨酯的制备及性能研究
王 贵，陈汉彬，裴克梅
(浙江理工大学化学系，浙江，杭州 310018)
【摘 要】以异佛尔酮二异氰酸酯（IPDI）为硬段，以聚己二酸己二醇酯（PHA）和聚己二酸丁二醇酯（PBA）为软段，以三羟甲基丙烷（TMP）为交联剂，先合成聚氨酯预聚体；再以乙二胺（EDA）为后扩链剂，硅烷偶联剂（KH-550）为改性剂，制得交联型聚氨酯乳液。将不同比例石墨烯分散体添至聚氨酯乳液，在此基础上制备水性聚氨酯的涂层。探究了交联剂、KH-550和石墨烯添加量对涂层性能的影响，利用方块电阻计、粒度分析仪和傅里叶红外光谱仪（FT-IR）对样品进行了测试表征。研究结果表明：当w(交联剂TMP)=0.8%、w(硅烷偶联剂KH-550)=1.2%（均相对于聚氨酯乳液固体份的质量而言）、w(石墨烯分散体)=40%(相对聚氨酯乳液的质量而言)时，制得的聚氨酯涂层表干时间为2 h，实干时间为5 h，附着力为0级，铅笔硬度为4H，耐盐水和耐冲击性优异。
扩链剂丁二醇对聚氨酯热膨胀微胶囊性能的影响
张凌晨，李 坚，汪称意，任 强
（常州大学材料科学与工程学院，江苏常州 213164）
【摘 要】通过界面聚合反应，制备了以水性聚氨酯为壳、正己烷为核的热膨胀微胶囊。通过热重仪和激光粒度仪研究了丁二醇对微胶囊包覆量及粒径的影响，采用静态热机械分析仪研究了丁二醇对微胶囊发泡性能的影响。研究结果表明：随着丁二醇用量的增加，微胶囊中正己烷的包覆量略有降低，粒径变化不大，发泡倍率先减小后增大，发泡温度逐步增加；当w(丁二醇)=33.2%（相对于聚氨酯总物质的量而言）时，可以制得平均粒径为78.8 nm、正己烷发泡剂包覆量为13.2%（相对于聚氨酯总质量而言）且性能优良的热膨胀微胶囊；其起始发泡温度为206 ℃，最大发泡温度为220.1 ℃，发泡倍率最大为4.10倍。
【关键词】水性聚氨酯；热膨胀微胶囊；发泡剂；发泡性能
硅烷封端聚醚密封胶的研制及生产
任保勇1，杨劲松1，吕阳成2
（1.淮安清科顺驰汽车科技有限公司，江苏淮安 223005；2.清华大学化学工程系，北京 100084）
【摘 要】硅烷封端聚醚密封胶以其突出的环保性、可涂饰性、良好粘接性和原料成本低等优势，在建筑、家装、汽车与电子等领域的应用不断扩展。本文以硅烷封端聚醚树脂为基础聚合物，添加增塑剂、填料、交联剂、催化剂以及抗氧剂等原料，以力学性能作为评价指标，通过设计正交试验优化了主要原料品种和用量，得到单组分湿气固化硅烷封端聚醚密封胶。考察了复配树脂用量、纳米碳酸钙比表面积、增塑剂用量以及交联剂用量对密封胶力学性能的影响。设计了生产工艺和QC流程，实现了MS胶的高效稳定生产。
【关键词】硅烷封端聚醚；密封胶；MS胶；单组分；正交试验；力学性能
固化工艺对双酚AF型邻苯二甲腈树脂性能的影响
刘彩召，何玉虹，张 松，王 磊，张 斌，孙明明，张绪刚，李坚辉
（黑龙江省科学院石油化学研究院，黑龙江哈尔滨 150040）
【摘 要】采用六氟双酚A(BPF)和4-硝基邻苯二甲腈为原料，通过亲核取代反应制备了一种双酚AF型邻苯二甲腈树脂(AFPN)。通过傅里叶红外光谱(FT-IR)、核磁氢谱(1H-NMR)、时间飞行质谱(TOF-MS)对其化学结构进行表征。考察了不同固化工艺对AFPN热稳定性、热机械性能和粘接性能的影响。研究结果表明：AFPN的熔点为230 ℃，1,3-双（3-氨基苯氧基）苯(TPE-M)可以加速其聚合过程；当固化温度为375 ℃时，AFPN聚合物质量分数为5%时的热分解温度(T5%)为501 ℃，T10%为522 ℃，玻璃化转变温度(Tg)为327 ℃；AFPN树脂具有较好的阻燃性能和高温粘接性能以及潜在的应用前景。
【关键词】氟元素；邻苯二甲腈树脂；热性能；剪切强度
乳化剂对水性环氧树脂乳液制备影响的探究
郭海涛，童 鑫，黄立志，范国栋，刘佳娜，杨润田，孙永安
（株洲飞鹿高新材料技术股份有限公司，湖南株洲 412007）
【摘 要】采用大分子乳化剂（A）与自制的小分子乳化剂（B）对环氧树脂进行乳化，制得水性环氧树脂乳液。考察了使用单一乳化剂和复合乳化剂对水性环氧树脂乳液粒径、稳定性的影响。研究结果表明：单独使用大分子乳化剂或小分子乳化剂所制得的乳液粒径及稳定性均不及复合乳化剂，尤其在解决乳液离心稳定性方面，复合乳化剂性能更优；当w(复合乳化剂)=6%(相对于总质量而言)，且m(A)∶m(B)=65∶35时，环氧树脂乳液的性能相对最佳，乳液的粒径达到最小为0.342 μm；复合乳化剂的乳液所制得的水性环氧涂料，基本涂层性能和耐盐雾性能均优于单一乳化剂及市售产品。
【关键词】乳化剂；环氧树脂；乳液；制备；粒径；稳定性
无砟轨道嵌缝用硅烷改性聚醚密封胶的制备与研究
李义博，林坤华
（广州集泰化工股份有限公司，广东，广州 510665 ）
【摘 要】采用硅烷改性聚醚树脂制备了一种高弹性、低模量高铁无砟轨道嵌缝用密封胶。研究了硅烷改性聚醚树脂、纳米碳酸钙、触变剂和硅烷偶联剂对密封胶性能的影响。研究结果表明：采用树脂SAX510/SAX520的密封胶力学性能较优，较佳的质量比为25∶5；采用碳酸钙A的密封胶能够兼顾100%拉伸模量、断裂伸长率、弹性恢复率和施工性能，综合性能相对最优；采用2份聚酰胺蜡触变剂能够有效地改善施工性能，同时不提升模量；采用偶联剂A-link 600与A-187搭配使用，能够有效地改善密封胶的拉伸模量和浸水定伸性能。
可移除耐高温丙烯酸酯压敏胶的制备及性能研究
(上海保立佳新材料有限公司，上海 201417)
【摘 要】以过氧化苯甲酰为引发剂，丙烯酸（AA）、甲基丙烯酸羟乙酯（HEMA）为功能单体，丙烯酸丁酯、丙烯酸异辛酯为软单体，醋酸乙烯为硬单体，采用溶液聚合法制备了一种可移除耐高温丙烯酸酯压敏胶。着重探讨了功能单体用量、软硬单体比例、交联剂种类及用量对压敏胶性能的影响。研究结果表明：功能单体HEMA和AA用量都在2.0%时，压敏胶的耐温性优异，同时剥离力、初粘力符合要求；当软硬单体质量比为90∶10时，压敏胶的剥离力、初粘力、耐温性均符合要求，效果较佳；引入交联剂可显著提高压敏胶的内聚能，赋予压敏胶可移性，当选用异氰酸酯交联剂L-75为1.5%时，压敏胶特性相对最佳。
导热硅凝胶的研究与应用进展
陈维斌1,2
（1.美信新材料股份有限公司，广东深圳 518053；⒉广东省高性能特种粘接材料工程技术研究中心，广东深圳 518053）
【摘 要】介绍了导热硅凝胶的组成和特点，分别阐述了导热硅凝胶在导热机制、渗油性、密着力性能和电气强度等方面的最新研究进展。综述了导热硅凝胶在航空电子设备、5G电子设备、动力电池以及测井仪等方面的应用，最后对其发展方向进行展望。
【关键词】导热硅凝胶；热界面材料；导热机制；导热系数；渗油性
国内外有机硅压敏胶的研究现状与发展趋势
刘文雪，虞鑫海
（东华大学化学化工与生物工程学院，上海 201620）
【摘 要】综述了国内外有机硅压敏胶的研究现状、企业生产现状及其应用等。对有机硅压敏胶的应用前景作了展望，提出了未来的研究方向及发展趋势，为开发综合性能更加优良的有机硅压敏胶提供新思路。
Scientific Research Report
Preparation of ESO-ADA intermediate and its application in UV curable acrylate pressure sensitive adhesive
Wang Lei1, Lin Xiaodan1, Chen Keyu1, Liao Pingxiang2
（1.School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, Guangdong, China;2.Hunan Hexiangrun New Materials Co., Ltd., Yongzhou 266400, Hunan, China）
【Abstract】ESO-ADA intermediate was prepared by the reaction of epoxy soybean oil (ESO) and adipic acid (ADA) at the condition of 180 ℃. The intermediate was added as the filler to the mixture solution of isooctyl acrylate (2-EHA) as soft monomer, acrylic acid (AA) as hard monomer, hydroxyethyl acrylate (HEA) as functional monomer, and 2-hydroxy-2-methyl-1-phenyl-1-propanone (1173) as photoinitiator. After mixing evenly, it was coated on glassine paper, and covered with PET release film, pressure sensitive adhesive was then prepared by UV light curing. The formula was optimized by orthogonal experiment, and the effects of irradiation time, AA content, functional monomer content and coating thickness on the properties of pressure sensitive adhesive were studied. The research results showed that when the UV irradiation time was 120 s, the molar ratio of epoxy group to carboxyl group in ESO-ADA intermediate was 10∶6, ESO was 30 phr, soft monomer 2-EHA was 60 phr, w(AA)=20%,w(HEA)=3% (all relative to the sum of the mass of intermediate and 2-EHA), and the coating thickness was 100 μm, the pressure sensitive adhesive had relatively the best comprehensive properties. The curing completion was high, the initial tack was 18# ball, the 180° peel strength was 30.6 N·(25mm)-1, the holding force was more than 360 h, and the water contact angle was more than 90°.
【Keywords】epoxy soybean oil; adipic acid; acrylate; UV curing; pressure sensitive adhesive
Study on properties of dicyandiamide cured epoxy resin and its composite material toughened by EPN nano-rubber particle
Li Yafeng1,2, Zhang Dujuan1,2, Lu Haijun1,2
(1.Composite Technology Center, AVIC Manufacturing Technology Institute, Beijing 101300, China; 2.National Key Laboratory of Science and Technology on Advanced Composites, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China)
【Abstract】A kind of EPN core-shell nano-rubber particle was selected to modify the toughness of dicyandiamide cured epoxy resin. The chemical structure and surface morphology of EPN were characterized by Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). The dispersion state of EPN particle in epoxy resin was characterized by transmission electron microscopy (TEM). The effects of EPN particle on the rheological properties, reactivity and heat resistance of the system were characterized by viscosity, differential scanning calorimetry (DSC) and dynamic thermomechanical analyzer (DMA). The effects of EPN particle on the toughness of resin and its composite material were studied by the impact strength of resin casting, model I interlaminar fracture toughness (GIC) and compression after impact (CAI). The research results showed that the surface of EPN particle contained a large number of active functional groups, which had good compatibility with epoxy resin, and could be dispersed in epoxy resin in nano size. The active functional groups on the surface of EPN particle could react with epoxy resin, and the viscosity of the system added by EPN particle could meet the requirements of material process. EPN particle had a good toughening effect on epoxy resin, and when the addition amount was about 6%, it could make the impact strength of resin matrix reach more than 51 kJ/m2, which was 130% higher than that before toughening, and had no obvious effect on the Tg of the system at the same time. The research results of composite toughness showed that the GICand CAI of the composite material with 6% EPN addition increased by more than 60%, which had a significant toughening effect.
【Keywords】epoxy resin; nano-rubber particle; core-shell particle; toughness; composite material
Preparation of pressure sensitive adhesive for underwater surface bonding
Chen Zhong1, Qian Jun1, Shi Yifeng2
（1.School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237；2.Shanghai Hongdingfang Technology Co., Ltd., Shanghai 200237）
【Abstract】Inspired by marine organism mussel, the functional monomer containing DOPA structure (CQS-1) was synthesized in advance, and then the functional monomer was copolymerized with butyl acrylate and acrylic monomer in free radical solution to obtain acrylate pressure sensitive adhesive. The mechanical properties of pressure sensitive adhesive in dry and wet environment were investigated by using universal tensile testing machine. The research results showed that the pressure sensitive adhesive had excellent stability and bonding strength under water. When the content of CQS-1 was 6%, after being immersed in water for 180 min before bonding and being immersed in water for 1 440 min after bonding, the 180° peel strength of pressure sensitive adhesive with wet bonding could reach more than 80% and 90% of the original, respectively.
【Keywords】mussel; functional monomer; pressure sensitive adhesive; underwater
Study on plasma etching resistance of silica-reinforced fluororubber system
Zhang Buming1, Zhang Tianfu2, Liu Zengjie3, Lei Xiaohong4,Li Tao3, Zhang Xiaoa1,3, Li Wei2,Liu Li1
(1.Key Laboratory of Carbon Fiber and Functional Polymers of Ministry of Education, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China;2. Key Laboratory of Aerospace Chemical Power Technology, Hubei Institute of Aerospace Chemistry Technology, Xiangyang 441003, Hubei, China; 3. Shandong Institute of Shipbuilding Technology, Weihai 264209, Shandong, China; 4. Beijing Tongjia Hongrui Technology Co., Ltd., Beijing 102600, China)
【Abstract】Peroxide vulcanized fluororubber was prepared by using fluororubber and silica as the main raw materials. The vulcanization characteristics, mechanical properties, thermal stability and plasma etching resistance were studied. The research results showed that the effects of silica content on scorch time was negligible and all systems showed excellent stability. When the silica content was between 15 to 20 phr, the mechanical properties were the best, and the maximum tensile strength and tear strength were 19.8 MPa and 36.4 kN/m, respectively. All fluororubber systems added with silica showed excellent thermal stability and plasma etching resistance. The initial decomposition temperature was all about 405 ℃, the weight loss rate after etching was between 3.4% to 3.8%, and the surface change was more uniform. The chemical changes caused by plasma etching were further analyzed, under plasma etching condition, the C—F bonds on the surface were greatly reduced, the main chain that lost the shielding of F atoms was broken, and both low molecular degradation products and silica “particles” escaped from the material surface.
【Keywords】fluororubber; silica; thermal stability; plasma etching resistance
Preparation and properties of graphene-modified crosslinked waterborne polyurethane
Wang Gui, Chen Hanbin, Pei Kemei
(Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, Zhengjiang, China）
【Abstract】Using isophorone diisocyanate (IPDI) as hard segment, polyhexamethylene adipate (PHA) and polybutylene adipate (PBA) as soft segment, and trimethylolpropane (TMP) ) as crosslinking agent, the polyurethane prepolymer was first synthesized. Then the crosslinked polyurethane emulsion was prepared by using ethylenediamine (EDA) as post-chain extender and silane coupling agent (KH-550) as modifier. Different proportions of graphene dispersion were added into the polyurethane emulsion, and the waterborne polyurethane coating was prepared on this basis. The effects of addition amount of crosslinking agent, KH-550 and graphene on the coating properties were investigated, and the samples were characterized by sheet resistance meter, particle size analyzer and Fourier transform infrared spectroscopy (FT-IR). The research results showed that when w(crosslinking agent TMP)=0.8%, w(silane coupling agent KH-550)=1.2% (all relative to the mass of solid portion of polyurethane emulsion), w(graphene dispersion)=40% (relative to the mass of polyurethane emulsion), the surface drying time of the obtained polyurethane coating was 2 h, the actual drying time was 5 h, the adhesion was grade 0, the pencil hardness was 4H, and the salt water resistance and impact resistance were excellent.
【Keywords】polyurethane resin; crosslinking; KH-550; graphene
Development and Application
Effects of chain extender butanediol on properties of polyurethane thermally expandable microcapsule
Zhang Lingchen, Li Jian, Wang Chenyi, Ren Qiang
（School of Materials Science and Engineering, Changzhou University, Changzhou 213164, Jiangsu, China）
【Abstract】Thermally expandable microcapsule was prepared with waterborne polyurethane as shell and n-hexane as core by interfacial polymerization. The effects of butanediol on the coating amount and particle size of microcapsule were studied by thermogravimetry and laser particle size analyzer. The effects of butanediol on the foaming properties of microcapsule were studied by static thermomechanical analyzer. The research results showed that with the increase of the amount of butanediol, the coating amount of n-hexane in the microcapsule decreased slightly, the particle size did not change much, the foaming ratio first decreased and then increased, and the foaming temperature gradually increased. Whenw(butanediol)=33.2% (relative to the total mass of polyurethane), thermally expandable microcapsule with the average particle size of 78.8 nm and the coating amount of n-hexane foaming agent of 13.2% (relative to the total mass of polyurethane) and with excellent performance could be prepared. The initial foaming temperature was 206 ℃, the maximum foaming temperature was 220.1 ℃, and the maximum foaming ratio was 4.10 times.
【Keywords】waterborne polyurethane; thermally expandable microcapsule; foaming agent; foaming property
Development and production of silane-terminated polyether sealant
Ren Baoyong1, Yang Jinsong1, Lyu Yangcheng2
(1.Huai'an Qingke Shunchi Automobile Technology Co., Ltd., Huai'an 223005, Jiangsu, China; 2.Department of Chemical Engineering, Tsinghua University, Beijing 100084, China)
【Abstract】Silane-terminated polyether sealant has been widely used in the fields of construction, home decoration, automotive and electronic industries, due to its outstanding advantages such as environmental protection, paintability, good adhesion and low cost of raw material, etc. In this paper, single component moisture curing silane-terminated polyether sealant was prepared by taking silane-terminated polyether resin as base polymer, and adding plasticizer, filler, crosslinking agent, catalyst, antioxidant and other raw materials. Taking the mechanical properties as evaluation index, orthogonal experiment was designed to optimize the main raw materials and using amount. The effects of the amount of compound resin, the specific surface area of nano calcium carbonate, the amount of plasticizer and the amount of crosslinking agent on the mechanical properties of sealant were investigated. Production process and QC process were designed to realize the efficient and stable production of MS sealant.
【Keywords】silane-terminated polyether; sealant; MS sealant; single component; orthogonal experiment; mechanical property
Effects of curing process on properties of bisphenol AF-type phthalonitrile resin
Liu Caizhao, He Yuhong, Zhang Song, Wang Lei, Zhang Bin, Sun Mingming, Zhang Xugang, Li Jianhui
(Institute of Petrochemistry Heilongjiang Academy of Sciences, Harbin 150040, Heilongjiang, China)
【Abstract】A kind of bisphenol AF-type phthalonitrile resin (AFPN) was prepared through nucleophilic substitution reaction by using hexafluorobisphenol A (BPF) and 4-nitrophthalonitrile as raw materials. Its chemical structure was characterized by Fourier transform infrared spectroscopy (FT-IR), hydrogen nuclear magnetic resonance spectroscopy (1H-NMR), and time-of-flight mass spectrometry (TOF-MS). The effects of different curing processes on the thermal stability, thermomechanical properties and bonding properties of AFPN were investigated. The research results showed that the melting point of AFPN was 230 ℃, and 1,3-bis(3-aminophenoxy)benzene (TPE-M) could accelerate its polymerization process. When the curing temperature was 375 ℃, the thermal decomposition temperature (T5%) of AFPN polymer with 5% mass fraction was 501 ℃, T10% was 522 ℃, and the glass transition temperature (Tg) was 327 ℃.AFPN resin had good flame retardancy, high temperature adhesion and potential application prospects.
【Keywords】fluorine element; phthalonitrile resin; thermal property; shear strength
Study on the influence of emulsifier on the preparation of waterborne epoxy resin emulsion
Guo Haitao, Tong Xin, Huang Lizhi,Fan Guodong,Liu Jiana,Yang Runtian,Sun Yongan
（Zhuzhou Feilu High-Tech Materials Co., Ltd., Zhuzhou 412007, Hunan, China）
【Abstract】Waterborne epoxy resin emulsion was prepared by emulsifying epoxy resin with macromolecular emulsifier (A) and self-made small molecular emulsifier (B). The effects of single emulsifier and composite emulsifier on particle size and stability of waterborne epoxy resin emulsion were investigated. The research results showed that the particle size and stability of the emulsion prepared by using macromolecular emulsifier or small molecular emulsifier alone were not as good as those of composite emulsifier, especially in solving the centrifugal stability of emulsion, the performance of composite emulsifier was better. When w(composite emulsifier)=6% (relative to the total mass), and m(A)∶m(B)=65∶35, the epoxy emulsion had relatively the best performance, the particle size of emulsion reached the minimum of 0.342 μm. The basic coating performance and salt spray resistance of waterborne epoxy coating prepared by emulsion of composite emulsifier were better than those of single emulsifier and commercial products.
【Keywords】emulsifier; epoxy resin; emulsion; preparation; particle size; stability
Preparation and study of silane-modified polyether sealant for ballastless track caulking
Li Yibo, Lin Kunhua
(Guangzhou Jointas Chemical Co., Ltd., Guangzhou 510665, Guangdong, China)
【Abstract】A king of high elasticity, low modulus sealant for high-speed railway ballastless track caulking was prepared by using silane-modified polyether resin. The effects of silane-modified polyether resin, nano calcium carbonate, thixotropic agent and silane coupling agent on the properties of sealant were studied. The research results showed that the mechanical properties of the sealant with resin SAX510/SAX520 were relatively excellent, and the optimum mass ratio was 25∶5. The sealant with calcium carbonate A could give consideration to 100% tensile modulus, elongation at break, elastic recovery and construction performance, and its comprehensive performance was relatively the best. The use of 2 parts of polyamide wax thixotropic agent could effectively improve the construction performance without increasing the modulus. The combination use of coupling agent A-link 600 and A-187 could effectively improve the tensile modulus and soaking elongation of sealant.
【Keywords】sealant; elastic recovery rate; tensile modulus; yield stress
Preparation and properties of removable and high-temperature resistant acrylate pressure sensitive adhesive
Luo Yanhui
(Shanghai Baolijia New Material Co., Ltd., Shanghai 201417, China)
【Abstract】A kind of removable high-temperature resistant acrylate pressure sensitive adhesive was prepared by solution polymerization with benzoyl peroxide as initiator, acrylic acid (AA) and hydroxyethyl methacrylate (HEMA) as functional monomers, butyl acrylate and isooctyl acrylate as soft monomers, and vinyl acetate as hard monomer. The effects of functional monomer amount, the proportion of soft and hard monomers, the type and amount of crosslinking agent on the properties of pressure sensitive adhesive were emphatically discussed. The research results showed that when the amount of functional monomers HEMA and AA was both 2.0%, the temperature resistance of pressure sensitive adhesive was excellent, and the peel force and initial tack met the requirements. When the mass ratio of soft to hard monomer was 90∶10, the peel force, initial tack and temperature resistance of pressure sensitive adhesive met the requirements, and the effect was relatively good.The introduction of crosslinking agent could significantly improve the cohesive energy of pressure sensitive adhesive and give it removability. When isocyanate crosslinking agent L-75 was 1.5%, the characteristics of pressure sensitive adhesive were relatively the best.
【Keywords】high-temperature resistance; acrylate; pressure sensitive adhesive; soft and hard monomer
Special Topics and Review
Research and application progress of thermal conductive silicone gel
Chen Weibin1,2
(1.Meixin New Material Co., Ltd., Shenzhen518053, Guangdong, China; 2. Guangdong Provincial Engineering Technology Research Center for High Performance Special Adhesive Materials, Shenzhen 518053, Guangdong, China)
【Abstract】The composition and characteristics of thermal conductive silicone gel were introduced. The latest research progress of thermal conductive silicone gel in thermal conductive mechanism, oil permeability, tightness performance and electrical strength were described, respectively. The application of thermal conductive silicone gel in avionics, 5G electronic equipment, power battery and logging tool was summarized. Finally, the future development direction was prospected.
【Keywords】thermal conductive silicone gel; thermal interface material; thermal conductive mechanism; thermal conductivity; oil permeability
Research status and development trend of silicone pressure sensitive adhesive at home and abroad
Liu Wenxue, Yu Xinhai
(School of Chemical Engineering and Bioengineering, Donghua University, Shanghai 201620, China)
【Abstract】The research status, production status and application of silicone pressure sensitive adhesive at home and abroad were reviewed. The application prospect of silicone pressure sensitive adhesive was prospected, and the future research direction and development trend were put forward, which provided a new idea for the development of silicone pressure sensitive adhesive with better comprehensive properties.
【Keywords】silicone pressure sensitive adhesive; research status; development trend
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