共查询到20条相似文献,搜索用时 53 毫秒
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以高分子树脂膜为包覆剂,采用凝聚共沉法制备非填充型粉末NBR和超细碳酸钙填充粉末NBR。研究了包覆剂及超细碳酸钙的用量对产物粒径及其硫化胶力学性能的影响。结果表明,当包覆剂用量为10份时,粒径≤09mm的产物占998%,加入超细碳酸钙后可进一步减小产物的粒径;极性适宜的包覆剂及超细碳酸钙对粉末NBR硫化胶有显著的补强作用,故非填充型粉末NBR及超细碳酸钙填充粉末NBR均有良好的力学性能。扫描电镜分析表明,极性适宜的包覆剂与NBR有一定的相容性,并以粒径约05μm的微粒均匀分布于NBR基体中;超细碳酸钙则以原生粒子和粒径≤05μm的团粒存在,它在粉末NBR中的分散性比块状NBR/超细碳酸钙混炼体系有显著改善 相似文献
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高岭土填充型粉末丁苯橡胶的制备与性能的研究 总被引:2,自引:0,他引:2
以SBR胶乳为原料,经表面改性的高岭土(MO)为填料,高分子树脂为包覆剂,以凝聚共沉法研制高岭土填充型粉末SBR[P(SBR/MO)]。研究了影响产物粒径及硫化胶力学性能的因素,并与块状SBR/MO1机械混炼胶料硫化胶的力学性能进行比较。结果表明:当高岭土用量≥100质量份、包覆剂用量≥5质量份时,可获得粒径≤0.9mm的P(SBR/MO1)达100%;当高岭土的用量为100质量份及其表面改性剂用量的4质量份、Tg为18℃的包覆剂的用量为5质量份时,所获得的P(SBR/MO1)硫化胶力学性能最好。 相似文献
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试验研究包覆剂和超细碳酸钙对粉末丁苯橡胶(PSBR)粒径分布和PSBR/PVC共混物性能的影响。结果表明,以自制的Coron树脂[苯乙烯-马来酸酐(MA)共聚物,简称SMA]作包覆剂时,PSBR的粒径较小,PSBR/PVC共混物的拉伸强度和缺口冲击强度较大;当超细碳酸钙/丁苯胶乳质量比为3.5/6.5时,包覆剂SMA的适宜用量为0.8份,MA/苯乙烯的适宜质量比为0.56/0.24;当包覆剂SMA用量为0.5份时,加分散剂CH1-A的超细碳酸钙填充的PSBR粒径较小,对PVC的改性效果较好,超细碳酸钙的适宜用量为3.5~4份。 相似文献
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超细碳酸钙超充粉末丁苯橡胶的制备 总被引:2,自引:0,他引:2
将高分子电解质包覆剂和超细碳酸钙加入丁苯胶乳中,通过共凝聚法制得粉末丁苯橡胶(PSBR)。实验结果表明,PSBR粒径不大于0.9mm,具有良好的力学性能。PSBR的粒径主要由包覆剂的用量决定,超细碳酸钙对橡胶粒子有隔离作用。 相似文献
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高耐磨炭黑填充型粉末SBR研究Ⅱ.硫化胶的物理机械性能 总被引:6,自引:1,他引:6
研究了高耐磨炭黑(N330)填充型粉末丁苯橡胶[P(SBR/N330)]硫化胶的物理机械性能。结果发现。炭黑乳化剂的用量、炭黑改性剂和包覆剂的用量及玻璃化转变温度对P(SBR/N330)硫化胶的物理机械性能的影响比较明显。在适宜的粉末化条件下制备的P(SBR/N330),其硫化胶的物理机械性能与块状SBR/N330通过机械混炼得到的硫化胶的物理机械性能处于相同水平。P(SBR/N330)硫化胶拉伸断面形貌的SEM分析表明,包覆剂在用量为5份时形成的粒子与SBR基体结合紧密,在用量为15份时形成的粒子较易剥离。 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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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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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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利用组件技术开发化工原理实验课件,给出了系统层、组件库层和应用层的架构划分。重点讨论了组件库的设计,给出了流体阻力这一典型实验的实现描述。实践证实,基于组件技术可以提高仿真实验的开发效率。 相似文献