抗氧剂对ABS树脂加工稳定性的影响

通过测定ABS树脂的氧化诱导时间和氧化诱导温度及其在多次挤出前后熔融指数、黄色指数及微观结构的变化,研究了不同加工抗氧剂168、618、1076／168、1076／618对ABS树脂加工稳定性的影响。结果表明：四种抗氧体系均能使ABS树脂在多次挤出加工中保持良好的熔体稳定性,当抗氧剂168和618单独使用时,加入抗氧剂168和618的ABS树脂的热稳定性相当,但抗氧剂168能够更有效地抑制ABS树脂在加工过程中的黄变。当引入受阻酚类主抗氧剂1076后,其与亚磷酸酯类抗氧剂并用时的效果好于亚磷酸酯类抗氧剂单独使用时的效果。与其他抗氧剂相比,复合抗氧剂1076／168能够更好地保持ABS树脂在多次挤出加工中的各项性能。     

PVC/ABS合金的生产及应用研究进展

PVC／ABS合金是两种树脂通过共混技术制成的一类共混物。PVC／ABS合金一方面具有PVC独特的难燃自熄性、耐化学药品性,另一方面又具有ABS的耐热、耐冲击和容易加工的性能。介绍了PVC／ABS合金国内外研究现状,阐述了PVC／ABS合金的加工应用情况,并分析了PVC／ABS合金共混的生产工艺路线。     

超韧PA6/ABS合金的制备

以苯乙烯-马来酸酐（SMA）共聚物为增容剂,考察了ABS及SMA的含量对PA6／ABS共混体系的力学性能的影响;并利用SEM研究了PA6／ABS冲击断面的相结构。研究表明：SMA是PA6／ABS共混体系的有效增容剂。随着其含量的增加,分散相ABS粒子的尺寸减小,分散更加均匀,能显著地改善PA6／ABS共混物的冲击、拉伸和弯曲性能。在该共混体系中,ABS含量的增加能够大幅度地提高PA6／ABS共混物的冲击韧性;但当ABS含量超过10％时,将使PA6／ABS共混物的拉伸和弯曲性能明显下降。SMA的添加量为0．5％,且质量比为90／10的PA6／ABS共混体系能保持较好的加工性能,制备的PA6／ABS合金具有最佳的综合力学性能和超高韧性．Izod缺口冲击强度高达1200J／m。     

CPVC／ABS二元共混物性能的研究

本文研究了ABS树脂对CPVC／ABS共混物的力学性能和加工性能的影响。结果表明,随着ABS含量的增加,CPVC／ABS二元共混物的拉伸强度、维卡软化点和熔体粘度下降,而CPVC／ABS共混物的冲击强度得到明显改善。     

ABS在聚合物共混改性中的研究进展

从聚合物共混改性原理的角度介绍PVC／ABS、PBT／ABS、PA／ABS三种重要的共混物。分析了ABS用量和加工工艺对共混物性能的影响，讨论了ABS共混物的增容改性技术。展望了ABS共混物的前景，并强调了研究过程中应注意的问题。     

散香型ABS的制备及性能研究

以茉莉花香精、檀香香精等为原料,通过双螺杆挤出机制得香母料,将其添加到(丙烯腈／丁二烯／苯乙烯)共聚物(ABS)基体中制得散香型ABS。考察了香母料中香精挥发性的影响因素,以及香母料用量对ABS力学性能、加工性能的影响。结果表明,香精本身的性质、香精与ABS基体的相容性及其加工工艺和外部环境对香精挥发性有较大影响;香母料用量在5份以内时对ABS的综合力学性能影响较小,且对ABS的成型加工有利;制得的散香型ABS的香味能持续半年以上。     

无卤阻燃ABS/空心微珠复合材料的研究

研究了膨胀型阻燃剂、空心微珠、膨胀型阻燃剂／空心微珠对ABS树脂力学、加工及阻燃性能的影响。结果表明：膨胀型阻燃剂对ABS有一定的阻燃效果,且与空心微珠存在协同作用;在ABS／膨胀型阻燃剂／空心微珠(80／20／20)阻燃体系中,加入5份的弹性体SBS时,可使ABS复合材料获得较佳的综合性能。     

CPVC／ABS二元共混物性能的研究

研究了ABS树脂对CPVC／ABS共混物的力学性能和加工性能的影响。结果表明，随着ABS含量的增加，CPVC／ABS二元共混物的拉伸强度，维卡软化点和熔体粘度下降，而CPVC／ABS共混物冲击强度得到明显改善。     

阻燃PC／ABS合金热稳定性的研究

以等温和非等温热分解方式对使用卤／锑类阻燃剂的阻燃PC／ABS合金的热稳定性进行了研究，并对合金的阻燃性能、力学性能进行了测试。结果表明：三氧化二锑与十溴联苯醚复配后对阻燃体系的热稳定性产生影响，而且阻燃体系的热分解速率与二者的配比有密切关系。十溴联苯醚与三氧化二锑的质量比分别为2．5／1和1／1时，PC／ABS阻燃合金的热稳定性优良，阻燃性能和力学性能也比较好；在250～260℃时PC／ABS阻燃合金具有良好的加工稳定性。     

ABS/PP合金材料的研制

利用Brabender挤出机和密炼机分别制备了熔融接枝物PP g MAH,研究了ABS／PP、ABS／PP g MAH、ABS／PP／PP g MAH三种共混物的性能,且作了对比。实验结果表明:PP g MAH的加入,能在一定程度上改善共混物的冲击性能、加工流动性能和耐热性能。     

Stabilization of ABS with bound synergistic stabilizers added as masterbatches

ABS masterbatch concentrates in antioxidants and UV stabilizers were added as conventional additives for normal ABS. The thermal and photo-oxidative performance of these polymers were compared with that of the commercial ABS and additives by measurement of carbonyl index and embrittlement times. From the result obtained, it is concluded that the addition of these additives in the form of masterbatches appears to be a better practical way of incorporating antioxidants and UV stabilizers into ABS simply by dilution of ABS, as these give thermal and light-stabilizing effects that cannot be achieved by stabilizers added in a conventional way. The bound stabilizers are resistant to leaching and chemical extraction.     

ABS/PVC合金的热稳定性分析

通过热烘变色试验,对ABS／PVC合金的热稳定性进行分析。结果表明,所试验的三种PVC专用热稳定剂会加速ABS树指的热老化;当ABS／PVC合金比例为60／40时,其热稳定性较佳;CPE对合金的热烘变色有利;有机锡热稳定剂的效果最好。     

抗氧剂、光稳定剂在聚碳酸酯和改性材料中的应用技术

简单介绍了抗氧剂和光稳定剂作用、功能和类别.列举了不同抗氧剂、光稳定剂条件下聚碳酸酯和ABS改性合金材料热老化试验的数据:亚磷酸酯抗氧剂和受阻酚抗氧剂的配合体系,可以有效保护聚碳酸酯的相对黏度和色泽,提高PC/ABS合金拉伸强度和缺口冲击强度;使用紫外线吸收剂可以有效地延缓聚碳酸酯变黄并适当保持强度;经试验或实际应用确...     

ABS的耐候老化研究

主要对丙烯腈–丁二烯–苯乙烯塑料(ABS)的不同耐候性能进行了研究,通过人工加速老化试验,对比老化前后色差变化,考察光稳定剂对ABS耐候性能的影响。结果表明,添加光稳定剂能够有效地改性ABS耐候性能;受阻胺光稳定剂与紫外线吸收剂复配使用对ABS有很好的耐候效果;适当地提高受阻胺光稳定剂含量有利于提高ABS的耐候性能。     

PVC/ABS合金的热稳定性能研究

研究了影响聚氯乙烯/丙烯腈-丁二烯-苯乙烯共聚物(PVC/ABS)合金的热稳定性的3种因素,结果表明,随着ABS树脂含量的增加,合金的热稳定时间急剧缩短,ABS质量分数在20%~80%时,动态热稳定时间变化不大;随着有机锡热稳定剂用量的增加,合金的热稳定时间逐渐延长。通过对正交试验的极差分析,结果表明,有机锡热稳定剂对热稳定时间的影响最大,其次为硬脂酸钙,辅助稳定剂影响最小;随着注塑时间的延长,合金的白度变化不大,但黄色指数有逐渐增大的趋势。     

Influence of different types of UV absorber/UV stabilizer combination on the photodegradation of PC/ABS blend

The polycarbonate/poly(acrylonitrile butadiene styrene) blends, (PC/ABS), are mainly degraded by sunlight known as photodegradation when exposed to outdoor conditions. It is the ultraviolet (UV) radiation that is responsible for the degradation of the blend. To stabilize against the harmful UV radiation and to scavenge the radical species which arise from UV or thermally induced degradation of the PC or the ABS, UV absorbers, and UV stabilizers are used. In this article three different UV absorbers namely, Tinuvin 1577—hydroxyphenyl triazine type, Cyasorb 5411—benzotriazole type, Uvinul 3030—cyanoacrylate type, and two different UV stabilizers, Tinuvin 765—monomeric hindered amine type, Tinuvin 622—oligomeric hindered amine were compounded in different combinations with PC/ABS blend at 240°C using a twin screw extruder. Accelerated aging of the compounded sample was done by Atlas Suntest apparatus. The photodegradation studies were done using UV–vis, attenuated total reflectance Fourier transform infrared (ATR‐FTIR) spectroscopy, and Yellowing index measurement. The molecular weight of the compounded sample before aging was determined by gel permeation chromatography (GPC). It was found that samples protected with hydroxyphenyl triazine type UV absorber and oligomeric hindered amine show the best result for decreasing the degradation products, oxidation rate, and yellowing of the PC/ABS blend. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

利用混合电位理论研究化学镀Ni-Cu-P镀液的稳定剂

通过试验优选了ABS塑料上化学镀Ni-Cu-P镀液的稳定剂a、c,并研究了其效果.稳定剂提高了镀液的稳定性,通过混合电位-时间曲线的研究和其对镀液稳定时间和镀速的影响,确定了稳定剂的加入量.     

Online monitoring of the influence of the chemical structure of hindered amines on the hydrolysis of polycarbonate in a polycarbonate/poly(acrylonitrile–butadiene–styrene) blend by ultraviolet–visible spectroscopy

Without stabilization, polycarbonate (PC)/poly(acrylonitrile–butadiene–styrene) (ABS) blends are susceptible to a loss of mechanical properties after a few days of exposure to weathering conditions. ABS can be stabilized against terrestrial light by the use of hindered amines in combination with a UV absorber; such hindered amines cannot be used when PC is present in the polymer blend. The hydrolysis of PC is accelerated when a small amount of a hindered amine light stabilizer (HALS) is incorporated into the resin and is exposed to elevated temperatures. In this study, three different HALSs (Tinuvin 123, Tinuvin 770, and Tinuvin 765, Ciba, Basel, Switzerland) were used as UV stabilizers for PC/ABS blends, and their effects on the PC phase were observed with online ultraviolet–visible spectroscopy on extruded flat films. These stabilizers were compounded with the blends in a corotating twin‐screw extruder at 240°C. The molecular weight of the compounded samples was determined by gel permeation chromatography. The extent of degradation induced by the HALSs on the PC phase was found to be a function of its chemical structure. Tinuvin 123 with an amino ether functional group enhanced degradation in comparison with Tinuvin 770 and Tinuvin 765. Tinuvin 770, a secondary amine, was apt to be more reactive than Tinuvin 765, a tertiary amine, because less steric hindrance was experienced by the former. Accelerated aging of the compounded samples was performed. Decreased degradation was observed for the samples containing hindered amines; however, the HALSs alone were not effective in protecting the PC/ABS blends against harmful UV light. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

Chemiluminescence in thermal oxidation of ABS

Two concepts in the chemiluminescence research-the heterogeneous model and the kinetic approach-are discussed. The analysis of published data obtained by a highly sensitive photon-counting system reveals the contradictory nature of the heterogeneous model and proves its inconsistency. On the other hand, the kinetic approach has been successfully applied to evaluation of thermal oxidation in a variety of systems, ABS compositions in particular. Emulsion grade ABS were found to be essentially less stable than ionic mass polymerization products. Among the antioxidants studied, Santonox R is clearly more efficient than Irganox 1076. In emulsion grades the superiority of Santonox R to Irganox 1076 is reflected primarily in larger induction period, while in ionic resin it is mostly due to smaller oxidation rate constant values. The introduction of UV stabilizers by themselves has no influence on durability in either ionic or emulsion resins. Similarly to systems without UV stabilizers, Santonox R is more efficient than Irganox 1076 in mixtures with UV stabilizers as well. The comparative study of various ABS-coloring agent compositions by chemiluminescence and DSC reveals much greater sensitivity of the former. While DSC lets one make only a trivial conclusion that the introduction of an antioxidant improves stability, chemiluminescence shows the differences in durability as large as 3 to 4 times for the samples DSC fails to distinguish. In addition, chemiluminescence furnishes a significant insight on the factors affecting stability. The DSC thermal oxidative stability data can be related to resistance to oxidation during processing, whereas the chemiluminescence results are expected to be useful in predicting materials' lifetime at service temperatures.