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环氧树脂柔性固化剂种类众多,主要介绍改性脂肪族胺脂环族胺、柔韧性酸酐、聚合物类环氧树脂柔性固化剂研究进展,认为对固化剂分子设计和开发合成柔性固化剂来增韧环氧树脂,可提高环氧固化物性能。 相似文献
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为了全面、深入介绍水性双组分环氧/胺体系的技术方向和路线,论述了双组分水性环氧/胺体系(Ⅰ型和Ⅱ型)技术的发展历程;概述了Ⅰ型和Ⅱ型体系的固化成膜原理和机理;研究了Ⅰ型和Ⅱ型体系水性环氧树脂与固化剂技术提升思路,如,Ⅰ型环氧树脂的物理改进和化学改进的思路,3类Ⅰ型固化剂的技术发展,Ⅱ型环氧树脂及固化剂的技术发展;介绍了环氧丙烯酸杂化新技术的原理和应用。指出,具有相容性好、涂膜初期耐水性好、与锌粉配伍性好且适用期长、高性价比等性能的环氧树脂/固化剂体系将成为未来的发展方向。 相似文献
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环氧树脂柔性固化剂研究综述 总被引:6,自引:0,他引:6
环氧树脂柔性固化剂种类众多,主要介绍改性脂肪族胺、脂环族胺、柔韧性酸酐、聚合物类环氧树脂柔性固化剂研究进展。认为对固化剂分子进行没计,开发合成柔性固化剂来增韧环氧树脂,可提高环氧固化物性能。 相似文献
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以乳化沥青及水性环氧树脂为主要成膜物质,配合滑石粉、云母粉等填料及适当的功能助剂,制备出一种环保、高效的双组分防腐涂料。讨论了不同环氧树脂/固化剂体系的稳定性及其与乳化沥青的相容性,研究了不同软化点的乳化沥青对漆膜回黏性的影响,考察了不同配比的乳化沥青与环氧体系的综合性能。结果表明,由6520环氧乳液搭配8538固化剂组成的环氧体系与乳化沥青相容性良好,软化点为70℃的乳化沥青最合适。当环氧体系为25%、乳化沥青为50%时,所得漆膜软硬适中,防腐性能最佳,耐中性盐雾可达1 050 h。 相似文献
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采用重交70#沥青、聚丙二醇、脂肪族缩水甘油醚环氧树脂、芳香族酸酐和二聚脂肪酸酐(5个因素)及E-51环氧树脂制得环氧沥青材料。设计了五因素四水平正交实验,以拉伸强度和断裂伸长率为主要考核指标,研究了沥青、活性增容剂、固化剂等主要因素对环氧沥青材料力学性能的影响,并优化出最佳配方:10.0 gE-51双酚A环氧树脂,52.0 g重交70#沥青,1.5 g芳香族酸酐,8.0 g二聚脂肪酸酐,2.0 g脂肪族缩水甘油醚环氧树脂及0.5 g聚丙二醇,材料断裂伸长率可达231.65%,拉伸强度2.14 MPa。 相似文献
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以十一烯酸和乙二醇二缩水甘油醚为原料,通过开环反应合成了一种环氧沥青增容剂,采用环氧树脂,基质沥青,固化剂,增容剂及助剂熔融共混,制备环氧沥青结合料。利用FT-IR,离析试验,DMA等对增容剂的分子结构和增容效果进行了表征和研究,讨论了增容剂用量对环氧沥青固化体系的相容性和力学性能的影响,结果表明,增容剂的分子结构含有预期的环氧基和酯基并有效地改善了环氧树脂和沥青的相容性。增容剂质量分数为20%时(基于环氧树脂质量),体系离析降至4.0℃,拉伸强度为2.12 MPa,断裂伸长率为218%,吸水率为0.17,材料性能最优,且满足美国环氧沥青的指标要求。 相似文献
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空心玻璃微珠/环氧复合材料的制备及性能研究 总被引:3,自引:1,他引:2
制备了空心玻璃微珠/环氧复合材料。通过力学性能、固化收缩率、热性能等测试考察了空心玻璃微珠粒径、填充量、硅烷偶联剂处理对树脂及固化物性能的影响。结果表明,硅烷偶联剂改善了空心玻璃微珠与树脂基体的相容性。复合材料的力学性能随着空心微珠粒径减小而增大。随着空心微珠填充量的加大,固化物拉伸强度有所降低,冲击强度和弯曲强度在空心玻璃微珠质量分数为2%时达到最大值,比纯树脂分别提高了30%和34.2%,同时材料的固化收缩率和密度降低,玻璃化转变温度升高。 相似文献
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Epoxy asphalts were prepared by mixing styrene–butadiene–styrene (SBS) modified asphalt with epoxy resin. The curing process and morphology of epoxy asphalts were characterized by infrared spectroscopy and fluorescent microscope, respectively. The effects of epoxy resin contents, ratio of curing agent to epoxy resin and curing temperature on properties of epoxy asphalt were investigated. Results indicated that epoxy resin and epoxy asphalt showed similar curing efficiency. Epoxy asphalts can be cured at 120 or 60°C and its viscosity at 120°C can meet the demands of asphalt mixture mixing and paving. The chemical reaction of epoxy resin in epoxy asphalt is slow and reaction occurs not only with the curing agent but also carboxylic acid in epoxy asphalt. The microstructure of epoxy asphalt transforms from the dispersed structure to networks structure with epoxy resin content increasing and phase transition starts when 30 wt % epoxy resin present in asphalt. The softening point and tensile strength of epoxy asphalt increased with epoxy resin contents increasing. The softening point and tensile strength of epoxy asphalt were markedly improved when epoxy resin content was more than 30 wt %, which is attributed to formation of continuous structure of epoxy resin. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009 相似文献
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改性环氧树脂制备的热固性环氧沥青材料性能 总被引:1,自引:1,他引:1
采用改性环氧树脂和脂肪族多元羧酸固化剂(由C22:三元酸和二聚脂肪酸固化剂复配而成)及石油沥青制备了热固性环氧沥青材料。通过力学性能测试、DSC及扫描电镜研究了沥青含量对环氧沥青固化物拉伸性能、玻璃化温度、固化反应活性及相结构的影响。结果表明,沥青质量分数为44%的环氧沥青固化物的拉伸强度达8.37MPa,断裂伸长率达223.50%,玻璃化温度22.25℃,吸水率为0.2%。随着沥青含量的增加,沥青作为分散相的粒径越来越大,因而环氧沥青材料的拉伸强度降低。沥青含量的增加对固化物的玻璃化温度没有显著的影响。有沥青的环氧固化体系的反应活化能要小于无沥青的环氧固化体系。 相似文献
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为了制造复合材料气瓶,采用红外光谱、动态模量分析(DMA)等方法研究了按不同升温制度固化的复合材料气瓶用环氧树脂基体的反应固化度、玻璃化转变温度(Tg)以及其力学性能,以考察固化温度对树脂基体性能的影响,并对2种固化制度各自优缺点进行了对比分析。结果表明:加上促进剂可有效降低固化反应温度,80℃固化8 h固化度可达95%以上。同130℃固化4 h结果相似。试验证明该基体配方可以作为高性能湿法缠绕复合材料气瓶用树脂基体配方。 相似文献
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采用环氧树脂(E51)、马来酸酐接枝聚丙烯(PP-g-MAH)或苯乙烯-顺丁烯二酸酐(马来酸酐)共聚物(SMA)增容PP与丙烯腈-苯乙烯共聚物(AS)共混体系,重点研究了环氧树脂含量、固化剂(2E4MZ)以及热处理对PP/AS合金体系力学性能的影响,并辅以扫描电镜(SEM)进行微观结构分析以及差示扫描量热仪(DSC)进行结晶行为分析。研究表明,环氧树脂的加入提高了体系的相容性,材料的性能尤其是刚度得到较大提高,当环氧树脂用量为3份,固化剂用量为环氧树脂用量的4%时,体系的刚性最佳,弯曲模量高达1.75 GPa;热处理后,合金体系的结晶度提高,刚性进一步提高至1.84 GPa。 相似文献
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The carbon nanotube possesses outstanding physical properties. Theoretically, adding carbon nanotubes into a polymer matrix can remarkably improve the mechanical properties of the polymer matrix. In the present work, a series of composites was prepared by incorporating multiwalled carbon nanotubes (MWNTs) into an epoxy resin. The influences of MWNT content and curing temperature on the flexural properties of the epoxy resin were investigated. The results showed that a very low MWNT content should be used to ensure homogeneous dispersion of MWNTs in the epoxy matrix. A higher MWNT content may lead to deteriorated mechanical properties of the composites because of the aggregation of MWNTs. A decline in the flexural properties of the neat epoxy resin with increasing curing temperature was found. However, under the same curing conditions, improvement in flexural properties was observed for the composite with the low MWNT content and a mild curing temperature. The improvement was far beyond the predictions of the traditional short‐fiber composite theory. In fact, this improvement should be attributed to the retarding effect of MWNTs on the curing reaction of epoxy matrix. Therefore, the improvement in the flexural properties was only a pseudoreinforcement effect, not a nano‐reinforcement effect of the MWNTs on the epoxy resin. Perhaps, it is better for MWNTs to be used as functional fillers, such as electrical or thermal conductive fillers, than as reinforcements. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 3664–3672, 2006 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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Chris B. Saunders Alistair A. Carmichael Walter Kremers Vince J. Lopata Ajit Singh 《Polymer Composites》1991,12(2):91-95
Advanced composites, specifically carbon-fiber-reinforced epoxies, are used extensively for a variety of demanding structural applications, primarily because of their high strength-to-weight and stiffness-to-weight ratios, corrosion resistance, and damage tolerance characteristics. Electron beam (EB) treatment can be used to produce useful physical and/or chemical changes in plastics and composites by initiating various polymerization and crosslinking reactions. The advantages of using EB rather than thermal curing for carbon-fiber-reinforced epoxy composites include curing at ambient temperature, reduced curing times, and fewer volatiles. An EB-curable carbon fiber-acrylated epoxy composite is being developed for various applications. The tensile properties of the 14-ply EB-cured epoxy laminate were comparable with the properties of the thermally cured laminates used in the aircraft industry. Research is continuing to develop resin formulations and select coupling agents to improve the compression properties of EB-cured laminates. 相似文献