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本文就加工助剂和加工工艺条件对PVC/MBS共混物的透光率和浊度的影响进行了探讨,发现助剂用量和加工温度对共混物制品的光学性能有效大的影响。 相似文献
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粉末生SBR对PVC的增韧作用 总被引:5,自引:0,他引:5
研究了粉末改性SBR对PVC的增韧作用,用TEM、SEM和DSC对粉末改性SBR与PVC共混物进行了分析,发现粉末改性SBR对PVC有显著的增韧效果。当粉末改性SBR用量由5份增加到10份,共混物的冲击强度由10-20kJ/m^2突然升高到85-100kJ/m^2。这种突变是由改性SBR在PVC基体中的相形态由分散相转变为网状结构,导致共混物由脆性断裂过渡到韧性断裂造成的。DSC分析显示改性SBR 相似文献
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PVC/SBR热塑性弹性体的研制 总被引:1,自引:0,他引:1
以ABS、氯丁橡胶(CR)、马来酸酐(MA)接枝SBR(SBR-MA)作增容剂对PVC/SBR的共混比、增容剂、增塑剂用量做了优化选择。同时对动态硫化PVC/SBR的硫化体系、硫化工艺条件进行了探讨,并比较了动态硫化对共混体性能的影响。结果表明:PVC/SBR为80/20,增容剂ABS/SBR-MA为5/5时,选用半有效硫化体系,165℃下动态硫化6min,共混物综合性能最佳 相似文献
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透明PVC/MBS合金的研究 总被引:11,自引:1,他引:10
本文对不同型号的PVC与MBS进行共混改性,通过冲击,应力-应变试验,动态力学分析(DMA)、扫描电镜(SEM)和紫外可见光谱研究了PVC/MBS共混体系的性能与形态结构之间的关系。结果表明,用MBS改性PVC既能有效地提高共混物的韧性,又能保证其具有良好的透光率。 相似文献
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本文通过DSC、振簧仪研究了聚氧化乙烯类表面活性剂作为增容剂对PVC/SBR共混物相容性的影响,并用扫描电镜(SEM)观察了PVC/SBR共混物中橡胶分散相的形态结构和尺寸变化。结果表明,在PVC/SBR共混物中加入适量的表面活性剂可明显改善两相的相容性,橡胶分散相尺寸随表面活性剂用量、液体石蜡用量的变化而变化。 相似文献
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CPE与ACR或MBS协同增韧硬质PVC研究 总被引:10,自引:4,他引:6
本文研究了PVC/CPE/ACR或MBS共混物的力学性能与增韧剂组成比、加工条件和相形态之间的关系。实验结果表明,适宜组成比和加工条件下,CPE与ACR或MBS对硬质PVC有协同增韧作用,共混物形态结构以增韧剂呈精细网-岛相分散为特征。 相似文献
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从硫化特性、热变形值、凝胶质量分数和物理性能等方面考察了四亚乙基五胺(TEPA)对PVC和PVC/NBR共混物的交联作用以及PVC和NBR同时交联对共混物性能的影响。结果表明,PVC/NBR共混物中的PVC组分交联后,共混物的物理性能和热变形性能都有所改善;PVC和NBR两组分同时交联可改善共混物的物理性能和热变形性能,在NBR用量较大(60份以上)时效果更为明显,若NBR用量太低,则共混物热变形性能反而有所下降;交联剂TEPA对硫黄硫化NBR有一定抑制作用,对共混物的物理性能影响不大,但在一定用量范围内有较小的劣化作用 相似文献
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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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我厂3号回转窑(Φ4m×60m)生产线在1996年年底由SP窑(产量912t/d)改为NSP窑(产量1320t/d),预分解系统为四级旋风预热器带离线式分解炉 相似文献
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Conclusions It is significant that the purification on a single passage of viscose through porous ceramic corresponds to the result of a two-stage filtration of it in industrial filter-presses with standard fillings.Kiev Combine. Kiev Technological Institute of Light Industry. Translated from Khimicheskie Volokna, No. 3, pp. 20–22, May–June, 1969. 相似文献
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The objective of the study was to explore the effect of the degree of deacetylation (DD) of the chitosan used on the degradation rate and rate constant during ultrasonic degradation. Chitin was extracted from red shrimp process waste. Four different DD chitosans were prepared from chitin by alkali deacetylation. Those chitosans were degraded by ultrasonic radiation to different molecular weights. Changes of the molecular weight were determined by light scattering, and data of molecular weight changes were used to calculate the degradation rate and rate constant. The results were as follows: The molecular weight of chitosans decreased with an increasing ultrasonication time. The curves of the molecular weight versus the ultrasonication time were broken at 1‐h treatment. The degradation rate and rate constant of sonolysis decreased with an increasing ultrasonication time. This may be because the chances of being attacked by the cavitation energy increased with an increasing molecular weight species and may be because smaller molecular weight species have shorter relaxation times and, thus, can alleviate the sonication stress easier. However, the degradation rate and rate constant of sonolysis increased with an increasing DD of the chitosan used. This may be because the flexibilitier molecules of higher DD chitosans are more susceptible to the shear force of elongation flow generated by the cavitation field or due to the bond energy difference of acetamido and β‐1,4‐glucoside linkage or hydrogen bonds. Breakage of the β‐1,4‐glucoside linkage will result in lower molecular weight and an increasing reaction rate and rate constant. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3526–3531, 2003 相似文献
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A refined nonlinear value of the main parameter of a material, i.e., the elongation modulus versus the instant temperature value, was suggested for introduction into the computational algorithm of tempering stresses. 相似文献