短纤维用量对短纤维-橡胶复合材料混炼质量的影响

利用六棱同步变间隙转子进行聚酯短纤维用量实验。实验过程中通过添加不同份数的短纤维,对比分析了短纤维用量对短纤维-橡胶复合材料的混炼过程及混炼胶质量的影响。结果表明,当短纤维添加份数为3份时,混炼胶达到了最佳的物理机械性能。     

转子棱顶与密炼室的宽大间隙对短纤维混炼胶性能的影响

根据密炼机转子的棱顶与密炼室壁之间的大间隙理论,设计并试制了新型六棱同步转子,通过与普通四棱同步转子和六棱同步转子对比,分析了它们对短纤维-橡胶复合材料混炼特性和硫化胶性能的影响.结果表明,新型六棱同步转子对短纤维-橡胶复合材料的混炼作用优于普通四棱同步转子和六棱同步转子.在天然橡胶中加入聚酯短纤维后,胶料的流动性变差...     

采用新型变间隙转子混炼短纤维/橡胶复合材料

分析短纤维/橡胶复合材料的混炼机理,针对短纤维胶料混炼特点设计新型变间隙六棱同步转子。转子棱峰与密炼室内壁间隙影响短纤维在胶料中的混合和分散以及混炼胶中短纤维的长度。新型六棱同步转子采用变间隙设计,大间隙有助于短纤维的混合,小间隙有助于短纤维的分散。采用新型六棱同步转子可改善短纤维/橡胶复合材料的混炼质量和性能,并能够提高生产效率。     

转子构型对短纤维－橡胶复合材料混炼性能的影响

短纤维－橡胶复合材料有特殊的混炼要求,为满足其特殊要求,研发并试制了新型六棱同步转子,并将其与四棱同步转子及原六棱同步转子进行了对比研究。实验结果表明,新型六棱同步转子的混炼性能优于四棱同步转子和原六棱同步转子。     

短纤维-橡胶复合材料的混炼工艺

研究了转子转速和短纤维用量对短纤维-橡胶复合材料混炼过程及硫化胶质量的影响。结果表明,随着转子转速和短纤维用量的增加,混炼过程中消耗的最大功率、单位能耗等增加,当转子转速为70r/min,聚酯短纤维用量为3份时,硫化胶的拉伸强度、撕裂强度等物理机械性能出现最佳值。     

聚酯短纤维用量对SFRC性能的影响

研究聚酯短纤维用量对短纤维/橡胶复合材料(SFRC)混炼特性及物理性能的影响.试验结果表明,随着聚酯短纤维用量的增大,混炼过程中最大功率和排胶温度提高,胶料的门尼粘度增大,流动性变差;随聚酯短纤维用量增大,SFRC的邵尔A型硬度、拉伸强度和撕裂强度先增大后减小,300%定伸应力明显提高,拉断伸长率下降;聚酯短纤维用量为5份时SFRC综合物理性能较好.     

基于ADINA对六棱同步转子混炼流场的有限元分析

专用于短纤维补强橡胶复合材料混炼的新型六棱同步转子的构型特殊,故混炼过程中胶料的流动状态也十分复杂。利用有限元分析软件ADINA对短纤维补强橡胶复合材料混炼过程中六棱同步转子的流场,进行了模拟分析,内容主要包括压力场、黏度场,剪切应力场和速度场。分析了模拟流场的流动特性,以进一步判断和分析胶料的混炼状态。     

混炼过程中六棱同步变间隙转子的有限元结构分析

六棱同步变间隙转子具有复杂、特殊的构型,混炼过程中受力情况也十分复杂,难以用传统的计算方法进行计算。利用ADINA有限元分析软件对六棱同步变间隙转子在混炼过程中的受力情况进行模拟分析,对转子的位移和所受应力情况进行模拟计算,不仅提高了转子受力分析得准确性,更重要的是对转子设计提供了参考,提高了设计的合理性及设计效率。     

填充系数对同步转子密炼机混炼性能的影响

试验研究在同步转子密炼机上顶栓压力、冷却水温度和转子转速一定的条件下,改变填充系数对六棱同步转子密炼机混炼性能的影响,表明六棱同步转子有很强的吃胶能力,填充系数（β）存在最佳值。     

同步转子密炼机填充因数的确定

在同步转子密炼机上顶栓压力、冷却水温度和转子转速一定的条件下,试验研究改变填充因数对六棱同步转子密炼机混炼性能的影响,表明六棱同步转予有很强的吃胶能力,填充因数存在最佳值。     

Stress relaxation in short sisal-fiber-reinforced natural rubber composites

Stress relaxation behavior of chemically treated short sisal fiber-reinforced natural rubber composite was studied. The effect of bonding agent, strain level, fiber loading, fiber orientation, and temperature has been studied in detail. The existence of a single relaxation pattern in the unfilled stock and a two-stage relaxation mechanism for the fiber-filled composite is reported. The relaxation process is influenced by the bonding agent, which indicated that the process involved fiber-rubber interface. The rate of stress relaxation increased with fiber loading, whereas it decreased with aging. © 1994 John Wiley & Sons, Inc.     

Effect of short polyethylene terephthalate fibers on properties of ethylene-propylene diene rubber composites

The alteration in some properties of electron beam (EB) cured ethylene-propylene diene rubber (EPDM) reinforced by polyethylene terephthalate (PET) fiber was investigated in this study. Bonding system Resorcinol/Hexamethylenetetramine/Silica (RHS) was used to enhance the fiber/EPDM adhesion and to maintain optimum composite strength properties. Mechanical properties of composites namely; tensile strength, hardness and modulus at 100 % elongation have been enhanced by adding PET fibers and increasing irradiation dose. Moreover, the effect of fiber loading and irradiation dose on the soluble fraction behavior of the composite in benzene was also investigated. The soluble fraction of the composites decreased with increasing the fiber loading and irradiation dose. The extent of fiber alignment and strength of fiber-rubber interface adhesion were analyzed from the anisotropic swelling measurements. In addition, thermal stability of the composites was increased. Besides, the mechanical properties like tensile strength and stiffness were improved by thermal ageing. Scanning electron microscopy (SEM) for the fractured surfaces and Wide- angle X- ray diffraction (WAXD) of the investigated samples confirmed that the adhesion occurred between fibers and EPDM.     

纤维素短纤维复合胶料的性能研究

本文研究了纤维素短纤维的用量、取向对复合胶料物理机械性能、耐磨性、压缩生热性的影响以及纤维素短纤维对胶料混炼特性的影响。结果表明，随短纤维用量增大，混炼过程中最大功率和排胶温度提高，胶料的门尼粘度增大，流动性差，混炼特性变差；加入短纤维对提高胶料的综合物性有利；短纤维在胶料中沿不同方向取向后，胶料的物理机械性能出现了明显的各向异性现象。沿压延方向取向，胶料的耐磨性随短纤维用量增大而下降；而沿半径方向取向，胶料的耐磨性变化不大。短纤维用量和取向方向对胶料生热性影响不大。     

The performance of calcium carbonate filled,random fiber composites

This paper describes an investigation into the performance of calcium carbonate filled, random fiber reinforced composites. A series of composite plaques were fabricated by resin transfer molding (RTM) a calcium carbonate filled, unsaturated polyester resin with either an A-glass continuous strand mat (CSM) or an E-glass CSM preform. The influence of fiber type and calcium carbonate filler loading level were then evaluated through a combination of experiments and micro-mechanics based modeling. The results of these studies indicate that the use of the E-glass reinforcement led to better mechanical properties relative to their A-glass counterpart. In addition, the composite moduli increased as the calcium carbonate filler level increased; however, the composite strengths were insensitive to filler loading level. Finally, a previously developed micro-mechanics based model was extended to consider the presence of the filler within the resin matrix. This model was used to predict the tensile moduli and strength as well as the overall shape of the stress-strain curves. Good agreement was found between the model predictions and the experimental results which suggests that this model could be used as a preliminary design tool to examine the effect of constituent composition on structural performance.     

Mechanics of short fibers in filled styrene-butadiene rubber (SBR) composites

Different short fibers (glass, carbon, cellulose, polyamide, and polyester with aspect, length/diameter, ratio of 600, 860, 500, 83, and 330 respectively) were added to styrene-butadiene rubber (SBR) matrix filled with an inorganic semireinforcing mineral (sepiolite). In all cases, 18 parts by volume of fiber per 100 parts by mass of rubber were added. The fiber orientation attained (more than 60%) was evaluated by a ratio of directional mechanics on uncured samples. In glass and carbon fiber composites, because of decreases in fiber aspect ratio after mixing (10 and 35 respectively), no improvements in properties were obtained. The presence of fibers yields a large increase in green strength, stress at low strain, and tear strength. Logically, the elongation at break diminishes. The uncured and cured properties present a remarkable anisotropy. The adhesive employed (resorcinol-formaldehyde) to increase fiber-to-matrix adhesion enhanced the composite properties, especially in the case of polyester fiber composites. Thus, for polyester fiber composites, green strength became 15.85 kg/cm²; stress at 25% strain, 10.2 MPa; tensile strength, 6.3 MPa; elongation at break, 36%; tear strength, 70 N; and swelling in longitudinal direction, 1.06.     

不饱和聚酯片状模塑料力学性能的研究

研究了玻纤布、短切玻纤及碳酸钙对不饱和聚酯片状模塑料力学性能的影响,实验发现:玻纤布增强不饱和聚酯片状模塑料的力学性能比短切玻纤好,随着玻纤含量的增加,不饱和聚酯片状模塑料的拉伸强度先增加,达到一极大值之后减少。碳酸钙填充不饱和聚酯片状模塑料,随着碳酸钙含量的增加,不饱和聚酯片状模塑料的拉伸强度明显降低,弯曲强度增加。