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《塑料工业》2020,(5)
以三元乙丙橡胶(EPDM)/乙烯-辛烯共聚物(POE)/聚丙烯(PP)三元热塑性动态硫化橡胶(TPV)为基材,添加一种新型膨胀型无卤阻燃剂,制备出无卤阻燃EPDM/POE/PP三元TPV复合材料。通过UL94阻燃等级测试评价其阻燃性能,研究阻燃剂用量对其阻燃性能和力学性能的影响,同时考察界面相容剂马来酸酐接枝苯乙烯-乙烯-丁二烯共聚物(SEBS-gM AH)对材料性能的影响。结果标明,随着阻燃剂用量的增加,材料的硬度和密度增大,拉伸强度和断裂伸长率不断减小。当阻燃剂用量≥50 phr时,3. 0 mm和1. 5 mm可达V-0等级;界面相容剂的加入能提高材料的力学性能而不影响阻燃性能;通过对燃烧后的残炭形貌观察得出,该膨胀型阻燃剂对TPV材料具有较好的阻燃效果。 相似文献
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以二水合氯化亚锡为催化剂制备酚醛树脂动态硫化三元乙丙橡胶(EPDM)/聚丙烯(PP)热塑性弹性体(TPV),研究酚醛树脂和二水合氯化亚锡用量对EPDM/PP TPV硫化特性的影响以及助交联剂氧化锌和高乙烯基聚丁二烯(HVPBd)在硫化体系中的作用。结果表明:随着酚醛树脂用量的增大,EPDM/PP TPV的t90略有延长;随着二水合氯化亚锡用量的增大和硫化温度的升高,EPDM/PP TPV的t90明显缩短,硫化反应速率常数明显增大,硫化反应活化能先减小后增大;氧化锌和HVPBd可用于控制EPDM交联密度大小,提高EPDM/PP TPV的加工性能及抗压缩永久变形性能。 相似文献
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采用氢氧化镁为主阻燃剂,配合使用十溴二苯乙烷(DBDPE)、三氧化二锑和配合剂A(一种有机硅高分子材料),研究四者对EPDM/PP热塑性硫化胶(EPDM/PP TPV)性能的影响.结果表明,加入氢氧化镁会降低EPDM/PP TPV的物理性能,配合使用DBDPE和三氧化二锑时,EPDM/PP TPV的阻燃性能增幅较大、物理性能变化不大,对EPDM/PP TPV的流变性能影响较小;加入配合剂A,EPDM/PP TPV的氧指数大幅提高,物理性能降低,流变性能得到改善.EPDM/PP TPV的最佳阻燃配方为:EPDM/PP TPV 100,氢氧化镁 50,DBDPE 20,三氧化二锑 7,配合剂A 5。 相似文献
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以双叔丁基过氧化二异丙基苯(BIPB)为硫化剂、甲基丙烯酸锌(ZDMA)为填料,采用动态硫化法制备了乙烯-辛烯共聚物(POE)/聚丙烯(PP)热塑性硫化胶(TPV),研究了ZDMA的热性能,并考察了ZDMA与BIPB对混炼胶硫化特性及TPV物理机械性能的影响,表征了TPV的微观形貌。结果表明,ZDMA处于炼胶温度时不会发生分解和降解,且在165℃左右与BIPB分解产生的自由基发生反应,因此,加工温度确定为170℃左右;随着BIPB用量的增加,POE/PP TPV的拉伸强度和撕裂强度先增大后减小,扯断伸长率降低,而邵尔A硬度增大,最佳BIPB用量为1.0份;随着ZDMA用量的增加,POE/PP混炼胶的硫化速率和相对交联密度逐渐增大,POE/PP TPV的拉伸强度和撕裂强度先增大后减小,扯断伸长率和永久变形逐渐降低,邵尔A硬度和100%定伸应力呈上升的趋势,ZDMA最佳用量为10~15份;添加ZDMA的TPV断面粗糙,界面间的相互作用力增强。 相似文献
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运用动态硫化法制备聚丙烯(PP)/三元乙丙橡胶(EPDM)动态硫化热塑性弹性体(TPV),研究了EPDM含量对TPV性能的影响,发现PP/EPDM质量比为60/40时,TPV的拉伸性能达到最大,在此优化配比下研究了环烷油充油前后TPV拉伸性能、结晶性能、热稳定性能、动态力学性能及流变性能的变化规律。结果表明,环烷油的加入使得PP/EPDM拉伸强度下降,断裂伸长率增加;环烷油阻碍TPV中PP相的结晶,其结晶、熔融温度及相应焓值在充油过后都有所下降;环烷油降低了TPV的热降解速率,且使TPV中EPDM相和PP相分子链的玻璃化转变温度(T_g)降低,其中EPDM相的T_g降低更明显,同时熔融状态下TPV的复数黏度、储能模量和损耗模量下降,表明熔融状态TPV中聚合物分子链运动能力增加,分子链内摩擦减小,加工性能得到提高。 相似文献
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交联硫化体系对PP/POE/EPDM热塑性弹性体性能的影响 总被引:1,自引:0,他引:1
采用动态硫化法制备聚丙烯/聚烯烃弹性体/三元乙丙橡胶(PP/POE/EPDM)共混型热塑性弹性体,研究了交联前后不同POE/EPDM并用对比体系力学性能的影响。采用交联剂过氧化二异丙苯(DCP)及DCP/S硫化体系对PP/POE/EPDM体系进行硫化,研究了力学性能的变化。结果表明,EPDM可有效降低材料的硬度和断裂永久变形。助交联剂硫黄(S)对PP/POE/EPDM体系有较好的硫化作用,固定DCP用量为3份,S用量为0.4份时,体系力学性能最佳,交联对体系硬度影响很小。 相似文献
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The rheological and tensile properties and the morphology of polypropylene (PP)/ethylenepropylene-diene terpolymer(EPDM)/ionomer ternary blends were investigated, using a rheometric dynamic spectrometer (RDS), a dynamic mechanical thermal analyzer (DMTA), a tensile tester, and a scanning electron microscope (SEM). Two kinds of poly(ethylene-co-methacrylic acid) (EMA) ionomers, neutralized with different metal ions (Na+ and Zn++), were used. Blends were melt-mixed, using a laboratory internal mixer at 190°C. The composition of PP and EPDM was fixed at 50/50 by wt % and the EMA ionomer contents were varied from 5 to 20 wt %, based on the total amount of PP and EPDM. It was found that the ternary blends, containing Na-neutralized ionomer, showed considerably different rheological properties and morphology as compared to the PP/EPDM binary blends, due to the compatibilizing effect of the ionomer for PP and EPDM, while the ternary blends, containing the Zn-neutralized ionomer, did not. The compatibilizing effect was most prominent at 5 wt % ionomer concentration. © 1994 John Wiley & Sons, Inc. 相似文献
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EPDM/PP共混型热塑性弹性体的研制 总被引:15,自引:4,他引:11
采用动态硫化法在单螺杆挤出机组上制备了EPDM/PP共混型热塑性弹性体(TPV);采用力学试验、动态热流变试验等方法,研究了EPTM/PP共混型TPV的配方组成、熔融共混温度与性能的关系,提探讨了TPV配方设计机理。为TPV的投产与应用提供技术参数。 相似文献
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对EPDM/PPTPV的反应控制及反应控制与性能的关系进行了研究。结果表明,过氧化物(VD),酚醛树脂(VP),硫黄(Vs)体系均适宜作EPDM—E/PPTPV的硫化体系,而VD硫化体系在交联EPDM—D/PPTPV时有较快的硫化速度。TPV的反应速度随ENB含量、乙烯含量、DCP用量的增加而加快,也随反应温度和转速的提高而加快。在研究范围内,由反应温度引起的速度对力学性能的贡献最大,其次为转速引起的速度,再次为交联剂引起的速度,且3因素引起的速度与拉伸强度和拉断伸长率之间有最佳值。 相似文献
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In this article, the phase morphology and rheological properties of polypropylene (PP)/poly(ethylene‐co‐octene) (POE) blends with a droplet‐matrix microstructure were studied by scanning electron microscopy and rheological experiments. The data were analyzed to yield the variations of rheological behavior with blend composition and insight into the microstructure of PP/POE blends. The Palierne's emulsion type model was used to extract information on rheological properties, and the interfacial tensions between the PP and POE were determined by fitting the experimental data with this model. The results indicated that the interfacial tensions were shown to depend on blend composition and temperature. Rheological properties of PP/POE blends were investigated in a systemic way with varying shear histories. The results showed that shear history had an important effect on the rheological properties of the blends due to the dispersed phase (POE) domains refined with increasing preshear rate and preshear time. POLYM. COMPOS., 2010. © 2009 Society of Plastics Engineers 相似文献
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PP/POE/T-ZnOw复合材料流变行为的研究 总被引:1,自引:0,他引:1
王蕾;胡国胜;王标兵 《中国塑料》2010,24(10):66-70
通过熔融共混的方法在双螺杆挤出机上制备了聚丙烯/乙烯-辛烯共聚物/四针状氧化锌晶须(PP/POE/T-ZnOw)三元复合材料。利用毛细管流变仪分析了纯PP、PP/POE二元共混物和PP/POE/T-ZnOw三元复合材料的流变行为,详细研究了T-ZnOw含量对三元复合材料流变行为的影响。研究结果表明,POE对二元共混物的稠度影响与温度有关,而T-ZnOw含量对三元复合材料的稠度、表观黏度和黏流活化能具有不同的影响。 相似文献
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Tensile and impact properties of the ternary system polypropylene (PP)/ethylene propylene diene elastomer (EPDM)/glass fiber (GF) and the corresponding binary systems PP/EPDM blend and PP/GF composite are studied. Results are presented and analyzed as functions of compositional variables, viz., (i) matrix PP/EPDM blending ratio at constant GF loadings and (ii) GF loading at constant matrix blending ratios for the ternary system and (iii) EPDM content for PP/EPDM binary system and (iv) GF content for the binary system PP/GF, respectively. The role of individual components EPDM and GF in these mechanical properties is discussed and their combined effects are inspected at certain composition ranges. Theoretical analysis of tensile data is presented which reveals the effect of EPDM on the reinforcing effect of GF. Unlike the conventional role of an elastomer, increase of EPDM content in the presence of GF increases the modulus of the ternary system. Impact strength of the ternary system increases with increasing GF content both in the presence and absence of EPDM, showing a distinct minimum at matrix blending ratio PP/EPDM 90/10. Scanning electron micrographs of impact-fractured surfaces are presented to illustrate the dispersion of the two phases of the polyblend matrix, fiber alignment, and the fiber interface. 相似文献