共查询到19条相似文献,搜索用时 156 毫秒
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以新开发的有机硅聚合物为阻燃剂,应用于聚碳酸酯(PC)的阻燃改性,对比考察了自制有机硅阻燃剂和国外有机硅阻燃剂对PC的阻燃性能、力学性能和加工性能的影响。结果表明,添加6%的自制有机硅阻燃剂,PC的氧指数提高到32. 5%,阻燃等级达UL94 V-0级,阻燃效果跟国外产品相当;同时,自制有机硅阻燃剂可提升材料的断裂伸长率、冲击强度,可明显改善PC的加工流动性。另一方面,添加自制有机硅阻燃剂后,PC的拉伸强度和弯曲强度有所下降,但性能保持率均在90%以上。当添加量为6%时,PC的综合性能最佳。 相似文献
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无卤阻燃PC/ABS合金的研究进展 总被引:1,自引:0,他引:1
综述了近年来国内外采用无卤阻燃剂阻燃PC/ABS合金的研究进展。介绍了PC/ABS合金无卤阻燃剂的分类、阻燃机理及存在的一些问题和解决方法。重点介绍了有机磷系阻燃剂及其对PC/ABS合金的阻燃性能、热分解和机械性能等的影响,并指出了今后的研究重点和发展方向。 相似文献
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综述了近年来国内外采用无卤阻燃剂阻燃PC/ABS合金的研究进展。介绍了PC/ABS合金无卤阻燃剂的分类、阻燃机理及存在的一些问题和解决方法。重点介绍了有机磷系阻燃剂及其对PC/ABS合金的阻燃性能、热分解和机械性能等的影响,并指出了今后的研究重点和发展方向。 相似文献
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研究了增容剂苯乙烯-丁二烯-马来酸酐共聚物(MPC 1545R)、四苯基双酚A二磷酸酯(BDP)与磷酸三苯酯(TPP)复配阻燃剂及不同螺杆组合工艺对聚碳酸酯(PC)/丙烯腈-丁二烯-苯乙烯塑料(ABS)合金性能的影响。通过扫描电子显微镜分析了PC/ABS合金的微观结构。结果表明,MPC 1545R对PC/ABS合金起到了较好的增容效果,单一BDP阻燃剂,BDP与TPP复配阻燃剂均可显著提高PC/ABS合金的阻燃性能,BDP与TPP复配阻燃剂的阻燃效果比单一阻燃剂BDP好,当PC,ABS,MPC 1545R,BDP和TPP用量分别为70,30,5,10,3.5份时,制备的无卤阻燃PC/ABS合金的极限氧指数为27.9%、阻燃等级为UL94 V-0级,综合力学性能最好。适当地降低螺杆的剪切强度,提高螺杆的分散能力,可以获得力学、阻燃性能及外观较好的阻燃PC/ABS合金。 相似文献
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Weihua Wang Guoqun Zhao Xianghong Wu Xiuhong Li Chenggong Wang 《Polymer Composites》2015,36(9):1653-1663
In this study, standard test specimens with flame‐retarded short glass fiber‐reinforced PC/ABS materials were fabricated under rapid thermal cycle injection molding condition by selecting a potassium perfluorobutane sulfonate flame retardant specially used for PC, FR2025, and two kinds of aryl phosphorus halogen‐free flame retardants, UN707 and PX‐220. The flame‐retardancy effect of the above different flame retardants on the studied systems was compared through combustion tests of the specimens. Meanwhile, the thermal and mechanical properties of flame‐retarded composites were studied by using the thermogravimetry analysis, dynamic mechanical thermal analysis (DMTA), and universal testing machine. The results show that the “candlewick effect” of fibers exacerbates the fire behavior of composites. With the increase of the aryl phosphorus halogen‐free flame retardants, the flame‐retardancy effect of composites is obviously improved, and the maximum thermal degradation rate of composites is significantly decreased. The UL94 combustion rating is improved, and the time of residual flame is substantially reduced with the increase of PC content under the same content of flame retardant. The DMTA results show that the flame retardants have a reinforcement action on PC/ABS matrix. However, the macroscopic mechanical properties are slightly decreased in the glass fiber‐reinforced composites because of the destructive effect of the flame retardants on the interface compatibility between matrix and fibers; the scanning electron microscopic micrographs of tensile fracture fully prove this action mechanism of flame retardants. In addition, the addition of toughener and antidripping additive significantly affects the flame retardancy and mechanical properties of composites. POLYM. COMPOS., 36:1653–1663, 2015. © 2014 Society of Plastics Engineers 相似文献
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采用X射线能谱分析(EDX)研究了PC/ABS/聚硼硅氧烷阻燃合金的燃烧行为,同时考察了阻燃PC/ABS合金的力学性能和加工性能。结果表明,聚硼硅氧烷(PB)中的Si元素会随着燃烧过程的进行逐渐在合金表面进行富集,形成富含Si的绝缘炭层覆盖在基体表面,阻止合金继续燃烧,从而有效提高了PC/ABS合金的阻燃性能。聚硼硅氧烷使PC/ABS合金体系的力学性能有所下降,但拉伸强度下降较少,PB对PC/ABS合金的冲击强度影响较大。在阻燃PC/ABS合金体系中加入相容剂马来酸酐接枝ABS,可使合金体系的力学性能得到明显提高。适量的PB可以改善PC/ABS合金的加工性能。 相似文献
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不饱和聚酯树脂微胶囊化聚磷酸铵对阻燃聚丙烯性能的影响 总被引:1,自引:0,他引:1
利用微胶囊化技术合成了新型磷氮体系无卤膨胀型阻燃剂IFR,用于聚丙烯(PP)阻燃改性。考察了阻燃剂IFR中聚磷酸铵(APP)用不饱和聚酯树脂(UPR)的微胶囊包覆效果以及UPR的用量对阻燃PP的阻燃性、耐水性、力学性能和成炭性等的影响。结果发现随着包覆层UPR用量的增加,阻燃PP的氧指数略微增大,耐水性有所改变,力学性能下降变化幅度不大,成炭性变弱。但当UPR包覆量为5%时,对PP的阻燃、耐水以及成炭效果都比较良好。 相似文献
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采用热重(TG)分析法研究了不同升温速率下,SNP阻燃剂对聚碳酸酯(PC)热降解行为的影响,并且通过Kissinger和Flynn-Wall-Ozawa两种方法对PC/SNP复合材料的热分解动力学进行了探讨,两种方法计算结果一致,均表明阻燃剂SNP的加入降低了PC的热分解活化能,相比PC分别降低了9.9%和9.0%。采用时–温等效原理对阻燃PC的老化寿命进行了预估,结果发现,SNP阻燃剂的加入使PC的老化寿命明显缩短,表明SNP阻燃剂能加快PC的热降解速率,使PC的初始分解温度提前了6.46%,促使PC更早地降解成炭,成炭量增加了28%,从而提高了PC的阻燃性能。 相似文献
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Novel phosphorus‐containing and nitrogen‐containing intumescent flame retardants, bis‐aminobenzyl spirocylic pentaerythritol bisphosphonate (BASPB) and arylene‐N,N′‐bis(2,2‐dimethyl‐1,3‐propanediol phosphoramidate) (ABDPP), were synthesized, and their structures were characterized with Fourier transform infrared spectroscopy and 1H and 31P nuclear magnetic resonance. The phosphorus compounds were used to impart flame retardancy to polycarbonate (PC). Combustion behaviors and thermal degradation properties of the flame‐retarded‐PC composites were assayed by limiting oxygen index (LOI), vertical burning test (UL‐94), cone calorimeter test, and thermogravimetric analysis. PC/5 wt.% BASPB and PC/5 wt.% ABDPP composites passed UL‐94 V‐0 rating; their LOI values were 35.5% and 34.7%, respectively. Scanning electron microscopy revealed that the char properties had crucial effects on the flame retardancy. The mechanical properties and water resistance of the PC/BASPB and PC/ABDPP composites were also measured. After water resistance test, PC/5 wt.% BASPB and PC/5 wt.% ABDPP composites kept V‐0 rating, and the mass loss was only 1.0%. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献