哈克转矩流变仪在PVC配方研究中的应用

研究了哈克流变仪在PVC配方研究中的应用,着重探讨了哈克流变仪在物料稳定性的比较,加工助剂对流变性能的影响,以及实验温度对塑化时间的影响,从而优化PVC配方和工艺参数。     

浅谈PVC物料的流变特征

通过分析PVC高聚物的流变性能,讨论了PVC物料在挤出机中和转矩流变仪中的流变特征,阐述了两种流变特征的相互关系及应用。     

PVC表观密度、老化白度对物料流变性能的影响

选取不同表观密度、老化白度的PVC,用RM智能转矩流变仪及小型实验用塑料挤出机进行流变对比实验,考查PVC表观密度、老化白度指标对物料流变性能及加工性能的影响。     

两种钙锌类复合热稳定剂对聚氯乙烯性能影响的研究

通过热老化烘箱实验、紫外耐候性实验和PVC加工的动态实验,利用两辊塑炼机和转(扭)矩流变仪对二苯甲酰甲烷(DBM)、硬脂酰苯甲酰甲烷(SBM)在聚氯乙烯(PVC)加工过程中的流变性能进行测试,结果表明,DBM在PVC加工过程中有良好的热稳定性及优越的流变加工性能,而SBM有较好的耐紫外线性能。     

转矩流变仪在PVC型材生产与质量管理中的应用

介绍了转矩流变仪与双螺杆挤出机工作原理,分析了二者的对应关系,提出了理想的PVC物料标准流变曲线概念,阐述了转矩流变曲线在PVC型材生产与质量管理中的应用方法。     

硫醇甲基锡在PVC加工中的热稳定性及加工性能测试

通过PVC加工的动态试验,利用两辊塑炼机和转(扭)矩流变仪对硫醇甲基锡在PVC加工过程中的热稳定性及流变性能进行测试,试验结果表明,硫醇甲基锡在PVC加工过程中有良好的热稳定性及优越的流变加工性能。     

转矩流变仪与差示扫描量热仪联用在研究PVC材料加工性能的应用

介绍了转矩流变仪与差示扫描量热仪的主要工作原理,并将其应用到研究PVC透明材料加工性能的工作中。结果表明,转矩流变仪与差示扫描量热仪联用,测试获得的塑化性能曲线和凝胶化度结果,可以对研究PVC加工性提供技术支撑。     

转矩流变仪在PVC管材生产中的应用

本文从转矩流变仪的构成、实验原理以及PVC干混料的动态热稳定性曲线的分析入手,重点介绍了转矩流变仪在PVC管材生产中的应用,并对辅料配方工艺等方面的调整给出了建议。     

PVC/NBR热塑性弹性体加工流变性能研究

采用反应挤出动态硫化法制备了聚氯乙烯／丁腈橡胶(PVC／NBR)热塑性弹性体，用锥板流变仪、毛细管流变仪和转矩流变仪研究了动态硫化的PVC／NBR热塑性弹性体的流交性能和塑化性能。实验结果表明，动态硫化的PVC／NBR热塑性弹性体的熔体属于剪切稀化的假塑性流体，具有良好的返炼性能，综合性能超过国外同类产品。     

一种新型硫醇甲基锡在PVC加工中的应用

使用开放式炼塑机和Brabender转矩流变仪,测试了一种新型硫醇甲基锡在聚氯乙烯(PVC)加工过程中的动态热稳定性能和流变性能。结果表明,与四种国内外产品相比,该新型硫醇甲基锡具有极佳的初期热稳定性和润滑性,适宜于PVC管材、管件、型材、异型材、板材等制品的加工。     

VC／BA共混物增容PVC／HDPE共混体系的研究

采用氯乙烯—丙烯酸丁酯(VC/BA)共混物作为聚氯乙烯(PVC)/高密度聚乙烯(HDPE)共混物的增容剂,通过冲击实验、拉仲实验、动态力学分析,系统地研究了共混体系性能与其结构之间的关系。通过Brabender流变仪测定了VC/BA共混物增容PVC/HDPE共混体系的流变性能。结果表明,VC/BA共混物是PVC/HDPE共混体系的良好增容剂。在一定范围内,VC/BA共混物与HDPE对PVC有协同增韧效应。vC/BA和HDPE的加入改善了PVC的塑化和流变性能     

Rheological properties of poly(vinyl chloride)/epoxidized natural rubber blends. Part I: Composition dependence and the effect of compounding conditions

Epoxidized natural rubber is a recently commercialized modified form of natural rubber. This paper is part of our continuing effort to study the responses of this new material to melt mixing and other shaping processes. The Shimadzu capillary rheometer was used to evaluate the composition dependence of miscibility of polyvinyl chloride/epoxidized natural rubber blends (PVC/ENR blends). The rheometer was also used to evaluate the effect of compounding parameters on the rheological properties of the blends. The results confirmed PVC/ENR blends as miscible systems that show a synergism in apparent shear viscosity highlighted by the positive deviation from the logarithmic additivity rule. These results based on capillary rheometry are also in very good agreement with our earlier attempt to predict optimum mixing from torque rheometry by using the Brabender Plastogram as an indicator.     

PVC/M-80共混体系的流变性能研究

本文采用高压毛细管流变仪及HAKKE转矩流变仪对PVC/M-80共混体系的流变性能进行了研究。探讨了原料组分比,以及加工工艺参数对PVC/M-80共混体系流变性能的影响。结果表明,PVC/M-80共混体系熔体是典型的非牛顿假塑性流体;随着M-80组分比的增加,共混体系熔体的平衡扭矩和熔体温度均呈明显的降低趋势;共混体系熔体的平衡扭矩随加工温度的增加呈线性降低;在常用加工转速范围内,转速对共混体系流动性的影响不明显。     

PUR-T／PVC热塑性弹性体的制备及工艺探究

以热塑性聚氨酯弹性体(PUR–T)、聚氯乙烯(PVC)为主要原材料,通过熔融共混挤出制备PUR–T／PVC共混热塑性弹性体。讨论了PUR–T／PVC共混比、增塑剂用量、挤出共混温度、螺杆转速对共混弹性体性能的影响,利用万能试验机、扫描电子显微镜、转矩流变仪、旋转流变仪等研究了弹性体的加工性能及结构。结果表明,当PUR–T／PVC共混比为70／30,增塑剂邻苯二甲酸二辛酯用量为20份,挤出温度为160℃,螺杆转速为330 r／min时,弹性体材料的综合性能最佳;共混弹性体的表观黏度小于纯PUR–T,PVC含量在20%～50%时,PVC易形成网络结构。     

Dynamic rheological behavior and mechanical properties of PVC/ACS blends

In order to increase the processability and mechanical properties of poly(vinyl chloride) (PVC), the terpolymer of acrylonitrile-chlorinated polyethylene-styrene (ACS) is used to modify the PVC. The plasticizing, rheological, and dynamic mechanical properties of PVC/ACS blends are investigated by means of torque rheometer, oscillation rheometer, and dynamic mechanical analyzer. The measurements of torque rheometer showed that both plasticizing time and stabilization torque are decreased with increasing ACS content. The PVC/ACS melts displayed larger dynamic storage modulus (G′), loss modulus (G′′), and complex viscosity (η*) than that of pure PVC, and these values reached maximum for the blend with 10 wt% ACS. When ACS content was below 10 wt%, PVC and ACS showed good compatibility in the blends by displaying a single T _g; however, when ACS content was more than 15 wt%, the phase separation phenomena occurred in the blends. PVC/ACS blends showed larger storage modulus (E′) and loss modulus (E′′) than that of pure PVC, but these values decreased with increasing ACS content. ACS can enhance both tensile and impact strength of PVC, and the impact strength reached maximum with 15 wt% ACS content which is higher 2.5 kJ/m² than the pure PVC. These results suggested that ACS is an efficient processing aid and toughening modifier for PVC at appropriate content.     

不同润滑剂对软质PVC加工性能的影响

采用转矩流变仪测定了添加不同润滑剂的软质PVC共混体系的加工性能,分析比较了润滑剂对软质PVC共混体系的影响,为润滑剂配方设计提供了可靠的试验参数。试验结果表明:在试验基础配方下,硬脂酸的用量在0.2份以内、聚乙烯蜡的用量在0.5份以内时,可获得加工性能最优的软质PVC。     

ACR类冲击改性剂的加工性能研究

简单介绍了用冲击ACR改性的PVC干混料的流变、挤出和加工热稳定性能。实验结果表明：与使用CPE改性的PVC干混料相比，使用冲击ACR改性的PVC干混料具有塑化时间短、塑化扭矩大、塑化温度高的特点。     

Rheological Behavior and Mechanical Properties of Blends of Poly(vinyl chloride) with CP-POSS

In this work, a polyhedral oligomeric silsesquioxane which contains 3-chloropropyl groups (CP-POSS) was synthesized. The rheological behavior of CP-POSS/PVC blends was investigated by torque rheometer and capillary rheometer. Mechanical properties were investigated by electronic material tester. Influences of blending composition, shear rate and shear stress on melt apparent viscosity and non-Newtonian index (n) were discussed. The results show that the plastic time decreases and melt viscosity increases with increasing content of CP-POSS. CP-POSS has a good compatibility with PVC. The blend has the best impact strength when the content of CP-POSS is 7 wt%. The CP-POSS can be used as a processing aid and impact-resistant aid for PVC.     

ACR加工助剂对PVC加工性能的影响

采用转矩流变仪分析了流变性能曲线和挤出曲线,探讨了ACR加工助剂在PVC加工过程中所产生的影响。实验表明:ACR加工助剂能够促进PVC体系的塑化,提高熔体强度及均匀性,对PVC的力学性能没有明显的不良影响。     

绿色环保硬质PVC基料的开发及应用

通过正交试验优化了硬质PVC的配方，研究了钙锌稳定剂、DOP、ACR、硬脂酸钙4种组分对PVC共混体系流变性能及试样力学性能的影响，结果表明：①绿色环保硬质PVC基料的最佳配方为：PVC100份、钙锌稳定剂5份、DOP4份、硬脂酸钙0．5份、ACR2份、PE蜡0．7份、硬脂酸0．3份；②影响PVC共混体系流变性能的最主要因素是钙锌稳定剂，其次为DOP，影响最小的是ACR；影响试样力学性能的最主要因素是DOP，其次是钙锌稳定剂，影响最小的是ACR。