纤维状硫酸钙填充改性硬聚氯乙烯的研究

本文是在采用工业副产品——纤维状硫酸钙作为硬聚氯乙烯填充剂的基础上,研究了该填充剂对硬聚氯乙烯性能的影响,以及EVA、CPE对硬聚氯乙烯/纤维状硫酸钙填充体系进行改性的效果。结果表明,纤维状硫酸钙综合性能优良;加入该改性剂后,填充体系的冲击强度和加工性能得到了明显改善;其它性能亦能满足使用要求。     

PVC抗静电材料的研究

选用导电炭黑及热塑性聚氨酯弹性体(TPU)、丁腈橡胶(P83)等改性剂对聚氯乙烯(PVC)进行抗静电及增韧研究,测试及分析了PVC共混体系的电性能、机械性能及耐热性能。实验结果表明:添加一定量的导电炭黑能明显提高材料的抗静电性能,但其冲击性能也随导电炭黑加入量的增加而下降,通过加入改性剂可改善体系的韧性。PVC/炭黑/TPU体系具有较高的抗静电效果及综合性能。     

用三元共聚改性剂制PVC耐热管材

利用自行研制的三元共聚耐热改性剂与聚氯乙烯（PVC）共混制成耐热管材专用料，考察了共混体系中耐热改性剂、抗冲改性剂、填料及热稳定剂等各组分对材料拉伸强度、冲击强度和维卡软化点等综合性能的影响，同时对氯化聚氯乙烯和自制耐药改性剂的耐药和加工性能进行了比较，所研制的耐热改性剂与PVC混合后耐热效果较好，且易挤出加工。研制的耐热管材的维卡软化点可达100℃，比无规聚丙烯管材的维卡耐热性能要高。     

科技简讯

<正> PVC用高聚物型冲击改性剂 PVC用高聚物型冲击改性剂ACR-501最近在山东研制成功。该类改性剂是近年来国内外发展相当迅速的功能助剂,具有提高PVC的冲击强度及韧性、改善PVC制品的加工流动性、赋予制品良好的耐候性及耐腐蚀性等功效。PVC用高聚物型冲击改性剂ACR-501,具有特殊的核/壳结构,具有优良的抗冲性能,兼具一定的加工性能,适用于PVC硬     

更高效的PVC加工助剂

坐落于美国康涅狄格州的康普敦(Crompton)公司本着改善助剂环境友好特性的观点出发,开发出一系列提高性能效率的聚氯乙烯加工助剂。最新的开发成果包括挥发性有机化合物(VOC)含量低的PVC软、硬制品热稳定剂;以及用于PVC硬制品加工的冲击改性剂。     

硬PVC矿用抗静电塑料管材的研究

硬PVC矿用抗静电塑料管材是由100份PVC,30份炭黑,适量的高分子改性剂和加工助剂,通过共混方法制备的复合导电材料。具有良好的机械性和永久的抗静电性及阻燃性。表面电阻为1×10~4Ω,缺口冲击强度为7.7kg·cm/cm~2,拉伸强度为500kg/cm~2。     

透明硬质聚氯乙烯改性剂的研究

研究了改性剂MBS对透明硬质聚氯乙烯力学性能、塑化性能及透明性的影响,考察了改性剂ACR-201在MBS/PVC体系中的作用。实验结果表明,BTA-712在提高硬质聚氯乙烯冲击强度、断裂伸长率和改善其加工性能方面占优势;QB-31在透明性等方面超过同类进口产品B-31。ACR-201不仅是一种良好的加工助剂,还能进一步提高MBS/PVC的力学性能和透明性。     

农用钙塑管试剂工艺

农用钙塑管是以氯化聚乙烯(C1PE)改性的聚氯乙烯加入大量填料加工成型的管材。它的性能特点,具有较高的机械强度,尤其是抗冲击强度为普通聚氯乙烯硬管的4～5倍。又因为含有高填料降低了成本,故具有应用于农业的基本条件,是较为理想的一种低挡材料。     

氯化聚乙烯增韧改性硬聚氯乙烯制品的研究

氯化聚乙烯（ＣＰＥ）是聚氯乙烯较好的抗冲击改性剂，改性的硬质聚氯乙烯制品冲击强度有较大提高。ＣＰＥ的加入，拉伸强度、弯曲强度、维卡软化点性能下降，刚性受损。ＣＰＥ具有促进ＰＶＣ凝胶化的作用，能改善其加工性能。     

填充炭黑对RPVC复合材料性能的影响

本文研究了经不同表面处理剂处理的炭黑(CB)对硬聚氯乙烯(RPVC)复合材料冲击性能及加工性能的影响。结果表明:通过对CB的表面处理,大大增强了复合材料的韧性,且加工性能也得到了改善;同时,由于CB的补强作用,复合材料的拉伸强度,弹性模量及维卡软化点也有不同程度的提高,且达到了抗静电效果。     

LDPE/EPM/炭黑导电复合材料的研究

制备了低密度聚乙烯(LDPE)／二元乙丙橡胶(EPM)／炭黑导电复合材料。用带功能基团的表面改性剂对炭黑进行表面处理,在炭黑低填充量下即获得了导电率高、综合性能优良的导电复合材料。研究了基体树脂的结构、工艺方法、炭黑的预处理、复合材料的后处理(退火)等对LDPE／EPW炭黑导电复合材料导电性能的影响。     

硬PVC/炭黑复合材料的性能与加工和形态的关系

本文研究了导电炉黑、润滑剂配比、抗冲击性剂以及混炼条件等对硬PVC的加工性、表面电阻和机械性能的影响。结果表明，除了炭黑用量，润滑剂配比、混炼炬温度也是决定复合材料性能的重要因素。为使复合材料具有良好的综合性能，应使制品中PVC呈初级粒子态存在。     

PVDF／炭黑导电复合材料研究

研究PVDF/炭黑复合材料中炭黑种类、用量、不同种炭黑并用及非导电填料对PVDF/炭黑复合材料电学及力学性能的影响。结果表明,HG-4炭黑填充的复合材料电性能和力学性能最好;HG-4炭黑与N339炭黑并用可得到既有良好电性能和力学性能,又有较好加工性能的复合材料;氧化锌能改善导电复合材料的电性能;炭黑种类影响导电复合材料的PTC特性。     

炭黑分散性对轮胎胎面胶性能的影响

研究炭黑分散性对全钢载重子午线轮胎胎面胶性能的影响。结果表明:提高密炼排胶温度和密炼能耗可以提高炭黑的分散性;炭黑分散性提高,有利于改善胶料的加工工艺性能和加工安全性能,提高物理性能和耐磨性能,降低生热。     

炭黑填充复合型导电塑料制备工艺技术

在炭黑填充复合型导电塑料的制备过程中,工艺技术起着十分关键的作用。为此,应从多方面入手,优化材料组成与加工条件,如通过精心选择炭黑品种与加工助剂并细心调节其用量;采用混杂填充、多相复合基体控制炭黑的分布模式;优化混合与分散的程序以及工艺条件;针对各种不同的成型方法,优化加工参数等,获得所需要的导电特性,改善材料的综合性能。     

白炭黑加工改质剂ATE-W在橡胶中的应用研究

试验研究白炭黑加工改质剂ATE-W在全钢载重子午线轮胎中的应用,并与德国莱茵公司的白炭黑分散剂ST进行对比。结果表明,在白炭黑填充胶中加入白炭黑加工改质剂ATE-W,可以明显改善白炭黑在胶料中的分散性,提高胶料的可加工性,可降低胶料的混炼能耗和排胶温度;对硫化胶的物理性能无任何不良影响;可提高胎面胶的抗湿滑性能和滚动阻力;对成品轮胎的强度和耐久性能无影响。ATE-W在胶料中的应用效果与白炭黑分散剂ST基本相当。     

Tire tread compounds with reduced rolling resistance and improved wet grip

The aim of this work is to investigate the replacement of carbon black by silica‐organosilane coupling agent system and the number of processing steps on the mechanical properties, rolling resistance, and wet grip of truck tire treads. Eight compounds were prepared: two formulations based on carbon black, five formulations with the partial replacement of carbon black by a silica‐organosilane coupling agent system, and one formulation with the total replacement of carbon black with silica. The rolling resistance decreased by 10% and the wet grip increased by 18.5% for the compound with 15 phr of silica, 3 phr of organosilane, and three processing steps compared to the standard compound. The processing steps also promoted an improvement in these properties for the composition with 50 phr of carbon black. The partial use of silica reduced the abrasion loss, thus confirming the durability of the compound. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134, 45334.     

Effect of particulate fillers on short jute fiber-reinforced natural rubber composites

The effect of carbon black on the processing characteristics and physical properties of jute fiber-reinforced composites and the role of silica and carbon black in promoting the adhesion between jute fiber and natural rubber have been studied. It was found that presence of silica is not essential to develop adhesion between fiber and rubber in the presence of carbon black. However, silica and carbon black can improve adhesion by minimizing the resin formation and controlling it to a low molecular weight species. Processing properties like green strength and mill shrinkage are improved by the addition of fiber. Carbon black does not affect mill shrinkage, but improves the green strength. Breakage of jute fiber during mixing is severe, but the extent of breakage is not affected by the presence of carbon black. The minimum loading of fiber to achieve reinforcement is reduced in the presence of carbon black. It was also found that the presence of clay in jute fiber rubber composites impairs the properties. Scanning electron microscopy (SEM) has been used to assess the failure criteria.     

Properties of vulcanizates from blends of natural rubber and thioglycolic acid modified,epoxidized, low‐molecular‐weight natural rubber filled with carbonized rubber seed shell

Vulcanizates from blends of natural rubber and thioglycolic acid modified, epoxidized, low‐molecular‐weight natural rubber filled with mixtures of carbon black and carbonized rubber seed shell, with semiefficient sulfur vulcanization recipes, were critically investigated and characterized. The investigated properties were the processing and rheological properties (the cure rate, cure time, scorch time, total oscillating disc rheometry torque, and Mooney viscosity), physicomechanical and chemical properties, solvent resistance, solubility, and swelling properties. On the basis of the investigated properties, it was observed that the carbonized rubber seed shell acted as a plasticizer and not as a reinforcing filler such as carbon black. The replacement of carbon black with up to 20% carbonized rubber seed shell produced vulcanizates having processing advantages in time gain and energy consumption, with their physical, chemical, and mechanical properties around the acceptable level for natural rubber compounds but lower than the properties obtained for a 100% carbon black filled vulcanizate. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007     

白炭黑/炭黑并用对轮胎胎面胶性能的影响

研究了白炭黑175Gr分别与4种炭黑并用对轮胎胎面胶加工性能、物理机械性能和动态物理机械性能的影响。研究表明,随着炭黑粒径的增大和结构度的提高,白炭黑175Gr/炭黑填充的胶料正硫化时间都缩短;白炭黑175Gr/炭黑N234并用时,其胶料拉伸强度和拉断伸长率都最高;白炭黑175Gr分别与炭黑N220和炭黑N550并用时,两种胶料的回弹性和压缩疲劳性都较好;白炭黑175Gr/炭黑N220并用后,其胶料的Payne效应较小,滞后损耗因子最低。