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改性双氰胺衍生物环氧固化剂的制备及性能研究 总被引:1,自引:2,他引:1
分别采用环氧丙烷、环氧丙烷丁基醚(501)和环氧树脂(EP)对双氰胺(DICY)进行改性,制备了一系列新型的改性DICY衍生物作为EP固化剂,并对改性DICY/EP固化体系的性能进行了初步研究。结果表明:当反应温度为95~105℃、n(DICY)∶n(环氧丙烷)=1∶1.1和n(DICY)∶n(501)=1∶1.3时,环氧丙烷改性DICY(反应3.0 h左右)和501改性DICY(反应3.0~4.0 h)的收率较高;EP改性DICY的最佳反应条件为反应温度105℃左右、反应时间4.0 h左右和n(DICY)∶n(EP)=1∶1.3。环氧丙烷(或501)改性DICY在室温时具有一定的潜伏性,与EP的相容性得到明显改善,并且其固化体系的起始放热温度比DICY体系降低了近40℃(或30℃);EP改性DICY具有较好的潜伏性(与DICY相当),并且极易溶于EP中,但其固化体系的起始放热温度稍低于DICY体系。 相似文献
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《化学推进剂与高分子材料》2017,(6)
以偏二甲肼、环氧丙烷和正癸酸甲酯为原料,合成新型热潜伏性环氧树脂固化剂1,1–二甲基–1–(2–羟丙基)胺–2–癸酰亚胺(ADI),并采用傅里叶变换红外光谱、核磁共振波谱和元素分析,确定了产物的结构,借助热重同步差热分析仪,研究了产物的热分解特性以及ADI/E–44双酚A环氧树脂体系固化反应热行为。结果表明:ADI/E–44双酚A环氧树脂固化温度为100℃,固化时放热平稳,常温下潜伏期在60 d以上。 相似文献
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为了制备环氧SMC片材专用树脂,采用双氰胺和有机取代脲类促进剂复配,并通过物理共混的方法,与双酚A类树脂(E51)、多官能团类环氧树脂和双酚F环氧树脂高速混合,制备脲基潜伏性固化剂的环氧树脂体系。采用凝胶化时间测试仪确定树脂体系的固化时间,在130℃固化时间为174s,并且没有爆聚现象发生。采用差示扫描量热仪(DSC)测试树脂体系的在130℃下玻璃化转变温度为120.2℃。采用万能材料试验机表征树脂体系的拉伸、弯曲和冲击力学性能,结果表明,三种环氧树脂混合后,浇筑件各力学性能较单一组分下浇铸件的力学性能有很大的提高。 相似文献
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用己二胺与双氰胺熔融缩聚, 合成了一种新型潜伏性环氧树脂固化剂, 并研究了其与环氧树脂的固化过程。用FTIR、XPS、1H NMR分析了固化剂的结构;用DSC分析得到了固化剂与环氧树脂的适宜配比、固化体系的适宜固化温度及固化动力学参数;通过XRD分析了固化物的相结构;通过TG分析了固化物的热稳定性。结果表明, 与双氰胺环氧树脂固化体系相比, 固化温度降低近70℃, 同时潜伏性能良好, 30 d内固化度少于10%, 热稳定性能良好, 热分解温度超过300℃。 相似文献
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以2-甲基咪唑(2MMZ)为芯材,聚苯乙烯(PS)为壁材,采用溶剂挥发技术,制备了一种新型潜伏性2MMZ-PS微胶囊固化剂。通过红外光谱仪(FT-IR)、热重分析仪(TGA)、扫描电子显微镜(SEM)、粒度分析仪和差热扫描量热仪(DSC)对微胶囊固化剂的化学结构、芯材含量、表面形貌、粒径分布及固化性能等进行了表征。所制备的微胶囊固化剂表面光滑,粒径分布较窄,平均粒径约为10.18 μm,芯材2MMZ含量为40.36%。由微胶囊固化剂与环氧树脂E-51制备的单组分胶黏剂,具有优良的固化特性和潜伏性能,可在相似文献
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Zhiguo Wang 《塑料、橡胶和复合材料》2018,47(7):306-314
A kind of intumescent ?ame-retardant curing agent (PCDSPB) was synthesised by using pentaerythritol, phosphorus oxycholoride, cyclohexane-1,3-diyldimethanamine (1,3- BAC) as raw materials and the structure was characterised by FTIR and MS. The composite materials were investigated by using TG, TG-FTIR, LOI, UL-94, SEM, and CCT. The results show that the ?lling of PCDSPB can improve the ?ame resistance of EP composites. When the phosphorus content of the composite system was 1.74 wt-%, the initial weight loss temperature was 299°C and the char yield was 26.3% at 600°C. Tensile strength was 35.4 MPa, impact strength was4.3 kJ m?2, LOI was 27.9, and the UL94 passed V-0 level. In the CCT, the peak heat release rate reduced to 276.0 kW m?2(EP-2) from 622.8 kW m?2 (EP-0), the total heat release decreased from 121.8 MJ m?2 (EP-0) to 89.5 MJ m?2 (EP-2). Therefore, the PCDSPB is a good intumescent ?ame-retardant curing agent for EP. 相似文献
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Shufang Jiang Shangwen Zha Lanjun Xia 《Journal of Adhesion Science and Technology》2013,27(7):641-656
A series of diphenylsilanediol modified epoxy resins and novel curing agents were synthesized. The modified epoxy resins were cured with regular curing agent diethylenetriamine (DETA); the curing agents were applied to cure unmodified diglycidyl ether of bisphenol A epoxy resin (DGEBA). The heat resistance, mechanical property, and toughness of all the curing products were investigated. The results showed that the application of modified resin and newly synthesized curing agents leads to curing products with lower thermal decomposition rate and only slightly decreased glass transition temperature (Tg), as well as improved tensile modulus and tensile strength. In particular, products cured with newly synthesized curing agents showed higher corresponding temperature to the maximum thermal decomposition rate, comparing with products of DGEBA cured by DETA. Scanning electron microscopy micro images proved that a ductile fracture happened on the cross sections of curing products obtained from modified epoxy resins and newly synthesized curing agents, indicating an effective toughening effect of silicon–oxygen bond. 相似文献