共查询到20条相似文献,搜索用时 843 毫秒
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合成了一种双马来酰亚胺改性酚醛树脂,探讨了固化剂HTMA及PO对树脂及其模塑料性能的影响,研究了两种固化树脂的固化特性.结果表明,PO引发固化的模塑料相对于HTMA具有更好的性能,马丁耐热温度可达148℃,表面电阻率高达2.56×1015Ω,冲击强度和弯曲强度分别为51.66 kJ/m2和113.9 MPa. 相似文献
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目前室温固化耐高温环氧树脂结构胶粘剂主要采用液体端羧基丁腈橡胶增韧环氧树脂为主体,以改性液体端胺基丁腈橡胶或聚醚胺为韧性固化剂,其最高使用温度仅120℃。聚硫橡胶作为环氧树脂增韧剂和固化剂则由于耐热性能和增韧效果差,很少用于室温固化耐热环氧树脂结构胶粘剂。通过改进聚硫橡胶的内聚强度和耐热性能,作为增韧剂,克服了聚硫橡胶耐热性能和增韧效果差的缺点,大大地提高了室温固化环氧树脂结构胶粘剂的剥离强度,通过BMI与脂肪胺加成反应,并加入叔胺固化剂,合成具有BMI结构和叔胺的固化剂,以及加入有机硅改性石棉,使室温固化环氧树脂结构胶粘剂的耐热性能达到177℃,瞬间使用温度达300℃,达到室温固化高温使用的目的。 相似文献
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马来海松酸类环氧树脂固化产物性能 总被引:2,自引:0,他引:2
本文研究了马来海松酸类环氧树脂与酸酐及芳香二胺类五种固化剂固化产物的耐热性能和机械性能,并详细讨论了固化后树脂的性能与环氧树脂、固化剂的化学结构及固化反应条件之间的关系。 相似文献
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以不同环氧改性有机硅树脂作为基料树脂,研究了不同树脂对漆膜性能的影响;通过选用不同固化体系对漆膜机械性能和耐热性做了比较;同时研究了环氧改性有机硅树脂与有机硅树脂的混溶性及影响;分别研究了该树脂配制的底、中、面涂层的常规性能及复合涂层的机械性能。同时对不同固化剂的影响和不同树脂的影响做了TG和DSC分析,结果表明,环氧改性有机硅树脂耐温性能较环氧树脂有较明显的提高,基本可用于高温涂料;环氧改性有机硅树脂可与纯有机硅树脂复配,有望形成具有更高耐温性能的涂膜。并且可通过复合固化剂的选用达到更佳的耐温性能和较好的物理机械性能。 相似文献
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以环氧有机硅树脂改性酚醛环氧制备了一种耐保温层下腐蚀涂料,以 TGA(热重分析)、 DMA(动态力学分析)、 DSA(表面接触角分析)等对涂层性能进行评估,考察了树脂比例、固化剂种类、颜填料种类对涂层耐热性能、机械性能和防腐性能的影响。结果表明:环氧有机硅树脂与改性酚醛环氧的质量比为 4∶6 时可有效提高涂膜耐热性能;采用该树脂,以改性脂环胺为固化剂,片状云母氧化铁红为主颜料制备耐温涂料时,涂层具有良好的机械性能、耐热性能、耐腐蚀性能,并通过 250 ℃条件下耐保温层下循环腐蚀性能要求。 相似文献
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二氰二胺作为环氧树脂的潜伏性固化剂,其固化物机械性能和介电性能优异。但由于二氰二胺与环氧树脂相溶性差,得不到均匀的组成物,且环氧树脂/二氰二胺体系的固化过程需在高于160℃的温度中进行。利用不同含量的有机酸与咪唑3位氮原子中和,改性生成的盐作为环氧树脂/二氰二胺体系固化促进剂,对该体系进行了改进,使其能够在中温(90~120℃)条件下固化。利用IR对改性产物进行了表征,并对未加促进剂的环氧树脂/双氰胺体系和以咪唑及有机酸改性咪唑为促进剂三种体系分别进行了差热分析。结果表明,有机酸改性咪唑促进剂可以使环氧树脂/二氰二胺体系的固化温度降低近50℃,并且适用期显著增加,长达141d,耐水性和耐热老化性能增加。 相似文献
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聚酰亚胺改性环氧树脂胶黏剂的研究 总被引:1,自引:0,他引:1
环氧树脂和聚酰亚胺的性能具有一定的互补性,用聚酰亚胺对环氧树脂进行改性可以综合两者的优点,得到具有良好机械性能和粘结强度的耐高温环氧胶黏剂。用聚酰亚胺中间体聚酰胺酸(PAA)对环氧树脂(EP)进行改性,加入一定量的端羧基丁腈橡胶(CTBN),用4,4’-二氨基二苯砜(DDS)做固化剂,先在一定温度下进行预反应,然后在一定的工艺条件下固化,通过调节不同的配比,得到具有较高耐热性的环氧树脂胶黏剂。具体研究了PAA用量、DDS用量、CTBN用量对胶黏剂力学性能的影响,筛选较好的配方。采用热重分析仪(TG)和差热扫描量热仪(DSC)等研究胶黏剂的耐热性能,并利用傅立叶变换红外光谱(FTIR)对各树脂进行结构表征,采用扫描电镜(SEM)对固化后胶黏剂的断面形貌进行了分析。 相似文献
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In this study, we aimed to reduce the cure time, and to lower the cure temperature of the benzoxazine compound. Therefore, curing reaction of benzoxazine with bisoxazoline or epoxy resin using the latent curing agent and the properties of the cured resins were investigated. The cure behavior of benzoxazine with bisoxazoline or epoxy resin using the latent curing agent was monitored by differential scanning calorimetry and measurements for storage modulus (G′). The properties of the cured resin were estimated by mechanical properties, electrical insulation, water resistance, heat resistance, and flame resistance. As a result, it was confirmed that by using the latent curing agent, cure time of benzoxazine and bisoxazoline or epoxy resin was reduced, and cure temperature was lowered. And it was found that the curing reaction using phenol‐novolac based benzoxazine (Na) as the benzoxazine compound could proceed more rapidly than that using bisphenol‐A based benzoxazine (Ba) as the benzoxazine compound. However, the cured resins from Ba and bisoxazoline or epoxy resin using the latent curing agent showed good heat resistance, flame resistance, and mechanical properties compared with those from Na and bisoxazoline or epoxy resin using the latent curing agent. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009 相似文献
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甲基丙烯酸(MAA)和环氧树脂(EP)进行反应后,添加偶氮二异丁腈(AIBN)和丙烯酸异辛酯,合成的含有丙烯酸树脂链段的环氧树脂作为增韧剂,制备成环氧胶膜。改性后的环氧树脂胶膜剪切强度及剥离强度明显提高,DSC测试显示体系的耐热性能损失不大,用红外光谱分析了固化过程及其改性过程中的反应情况。结果表明,改性后的EP制备出的树脂固化物具有良好的力学及耐热性能。 相似文献
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Hengxing Cheng Junhong Guo Yuan Ye Tianjing Zhao Jinfeng Cui Baoping Yang Bo Mu Li Tian Xuemei Bao Xiujun Zhang Yingping Zhou 《应用聚合物科学杂志》2024,141(5):e54885
In recent years, the poor weather resistance and aging resistance of additive flame retardants have caused researchers to pay attention to reactive flame retardants. A novel P-N coacting epoxy curing agent with intrinsic flame retardancy was designed and synthesized. The mechanical properties, crosslinking curing properties and flame-retardant properties of intrinsic flame-retardant epoxy resin were characterized. The results show that the cross-linking curing performance of hexa (3,5-diamino-1,2,4 triazolyl)-cyclotriphosphonitrile) (VCP) is lower than that of DDM. This is due to the decrease in cross-linking density caused by the VCP ring molecular structure. Therefore, the mechanical properties of the epoxy resin cured with VCP decreased, but the flame-retardant properties of the material significantly improved. The limiting oxygen index of the VCP/EP flame retardant epoxy thermosets was 27.3%, reaching the UL 94 V-1 level. The peak heat release rate and total heat release rate of the VCP/EP flame retardant epoxy thermosets were significantly reduced. The flame retardancy mechanism was studied by Fourier transform infrared spectroscopy, scanning electron microscopy, energy dispersive spectroscopy, and x-ray photoelectron spectroscopy. The results show that the intrinsic flame-retardant P-N coacting epoxy resin has excellent curing and flame-retardant properties. 相似文献