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1.
环氧化天然橡胶复合材料性能研究   总被引:2,自引:0,他引:2  
采用新方法制备环氧化天然橡胶(ENR)/白炭黑和天然橡胶(NR)/ENR/白炭黑复合材料,并对其性能进行研究。结果表明:ENR/白炭黑复合材料的热稳定性优于ENR;在NR/ENR并用胶中加入白炭黑和硅烷偶联剂KH-550,NR/ENR/白炭黑复合材料0℃时的损耗因子(tanδ)增大,65℃时的tanδ值减小,复合材料的抗湿滑性能提高,滚动阻力减小。  相似文献   

2.
橡胶加工分析仪研究环氧化天然橡胶的性能   总被引:1,自引:0,他引:1  
用橡胶加工分析仪对环氧化天然橡胶进行了温度扫描、频率扫描和应变扫描,并和天然橡胶的响应曲线进行了对比。  相似文献   

3.
介绍环氧化天然橡胶(ENR)的制备方法、性能及其对聚合物基复合材料的改性效果.ENR在保留天然橡胶(NR)的结构和性能的基础上,可进一步提高NR的气密性能和耐油性能等.不同硫化体系硫化ENR的性能不同,ENR的环氧度越高,其玻璃化温度越高,气密性能和耐溶剂性能越好.ENR可作为相容剂对NR和其他橡胶及白炭黑进行改性,提高胶料的性能和白炭黑在胶料中的分散性.  相似文献   

4.
研究了环氧化天然橡胶(ENR-40)在全钢子午线轮胎胎面配方中的应用效果。试验表明,ENR-40部分取代NR应用到轮胎配方中具有一定的优异性,对胎面配方硫化特性影响不大,胎面胶配方的物理机械性能提高,压缩疲劳生热降低。  相似文献   

5.
钟杰平  杨昌金  罗勇悦  许逵  彭政 《广州化工》2014,(21):83-84,181
采用流变仪测定添加不同硬脂酸钙用量的环氧化程度为25的环氧化天然橡胶(ENR25)的硫化曲线,研究硬脂酸钙用量对环氧化天然橡胶硫化动力学参数的影响。研究结果表明,随着硬脂酸钙用量的增加,反应速率常数k增大,硫化反应活化能E降低,表明硬脂酸钙的加入有助于促进ENR25的硫化,这可以减少生产过程中能耗,提高生产效率。  相似文献   

6.
《国际聚合物材料杂志》2012,61(3-4):241-254
Abstract

The paper reports on the curing characteristics and mechanical properties of oil palm wood flour (OPWF) reinforced epoxidized natural rubber (ENR) composites. Three sizes of OPWF at different filler loadings were compounded with a two roll mill. The cure (t 90) and scorch times of all filler size decrease with increasing OPWF loading. Increasing OPWF loading in ENR compound resulted in reduction of tensile strength and elongation at break but increased tensile modulus, tear strength and hardness. The composites filled with smaller OPWF size showed higher tensile strength, tensile modulus and tear strength. Scanning electron microscope (SEM) micrographs showed that at lower filler loading the fracture of composites occurred mainly due to the breakage of fibre with minimum pull-out of fibres from the matrix. However as the filler loading is increased, the fibre pull-out became very prominent due to the lack of adhesion between fibre and rubber matrix.  相似文献   

7.
白炭黑在环氧化天然橡胶中的应用   总被引:1,自引:0,他引:1  
摘要:研究在不使用任何偶联剂的条件下,白炭黑在环氧化天然橡胶(ENR)中的应用。白炭黑在天然橡胶(NR)中会发生明显的团聚,而在ENR中的团聚情况可得到明显改善,且ENR的环氧化程度越高,白炭黑的分散性越好。ENR白炭黑胶料表现出良好的抗湿滑性能和较低的滚动阻力,白炭黑用量大T20份时,ENR/白炭黑胶料的压缩生热明显低于NR/炭黑胶料。  相似文献   

8.
采用红外光谱、核磁共振交联密度仪及差示扫描量热仪等现代仪器分析方法研究环氧化天然橡胶生胶加速贮存老化期间分子结构与性能变化。结果表明:随着贮存时间的增加伴随着氧化降解现象的发生,环氧化天然橡胶的分子不断进行自然交联,交联密度与程度逐渐增大,老化12h时达到最大,随后出现下降趋势。  相似文献   

9.
In this work, natural rubber (NR) and regenerated cellulose (cel II) latexes were co-coagulated and to the mixture epoxidized natural rubber (ENR) was added on a two-roll mill. The cellulose content was fixed at 20 phr while ENR content varied from 0 to 75 phr. The influence of ENR was studied through the cure characteristics, aging and dynamic-mechanical properties. The aging provides nanocomposites with better solvent resistance and increased tensile strength at ENR content of 25 phr. The results suggest that a new type of light-colored nanocomposites were obtained, which presented high mechanical performance and resistance to solvents.  相似文献   

10.
《国际聚合物材料杂志》2012,61(3-4):275-289
Abstract

The fatigue behaviour of white rice husk ash (WRHA) filled ENR-50 compounds was compared with those of silica (Vulcasil-S) and carbon black (N 330) filled compounds. The effect of WRHA loading on scorch time and Mooney viscosity was also studied. The incorporation of WRHA in ENR-50 compounds reduced the scorch time but increased the Mooney viscosity. The increment in filler loadings has resulted in the reduction of the fatigue fife. The fatigue behaviour of ENR-50 vulcanizates was observed to be strain dependent. At a similar filler loading, silica filled vulcanizates showed the highest fatigue life followed by those of WRHA and carbon black.  相似文献   

11.
《国际聚合物材料杂志》2012,61(3-4):325-333
Abstract

Natural rubber (NR) composites were prepared by incorporating rubberwood fibres at different loadings into the NR matrix in a mixing mill according to a base formulation. Tensile properties, swelling measurement and tensile fracture surfaces of gum and composites with 0, 10, 20, 30 and 50 phr of rubberwood fibres were studied. Incorporation of rubberwood fibres in the composites increases the tensile modulus but reduces the tensile strength and elongation at break. Scanning electron microscopy (SEM) studies and swelling measurement indicate that the increasing rubberwood loading has weakened the rubber-filler interactions.  相似文献   

12.
凝固方法对天然橡胶力学性能的影响   总被引:1,自引:0,他引:1  
研究了三种不同凝固方法对天然橡胶性能和炭黑/天然橡胶硫化胶力学性能的影响。结果表明,采用十二烷基硫酸钠和氯化钙凝固制得的天然橡胶达到5号标准橡胶的质量,其力学性能比用醋酸凝固所制得的天然橡胶的力学性能要好。  相似文献   

13.
研究环氧化天然橡胶(ENR)在全钢载重子午线轮胎胎面胶中的应用。结果表明:用ENR部分取代天然橡胶(NR),胶料的门尼粘度增大,焦烧时间延长,强伸性能略有下降,抗湿滑性能显著改善,耐磨陛能提高,压缩生热略有升高。  相似文献   

14.
The curing properties and adhesive strengths of the epoxidized natural rubber (ENR, 25 mole percent epoxidation) modified epoxy systems are studied with differential thermal calorimetry (DSC), scanning electron microscopy (SEM), and lap shear strength (LSS) measurement. The results of DSC analyses indicate that the curing exotherm, the curing rate, the reaction order, and the glass transition temperature of the epoxy system are affected by the presence of reactive ENR. From SEM micrographs, it is obtained that a second spherical rubber phase is formed during cure and the particle size of the rubber phase is increased by increasing the curing temperature and the ENR content. The changes of the volume fraction of the rubber phase and the Tg of the cured systems indicate that the mutual dissolution between epoxy resin and ENR happens and which changes with the curing temperature and the ENR content. The LSS of adhesive joints prepared with the ENR modified adhesives are all lower than those of the unmodified epoxy system, and decrease with increasing the amount of ENR added because of the limited compatibility of the ENR with the epoxy matrix.  相似文献   

15.
The present study represents a new concept: the possibility of preparing a rubber compound filled with silica without the use of a silane coupling agent. For this purpose two different types of silica have been compounded with two different grades of epoxidized natural rubber (ENR) without the use of a silane coupling agent. The mechanical and other properties of the resulting compounds have been compared with two reference compounds prepared from natural rubber (NR) and silica with and without the addition of a silane coupling agent bis‐(triethoxysilylpropyl)tetrasulfane (TESPT). It is shown that by using ENR as rubber component together with silica, it is possible without the use of coupling agents to achieve significantly improved mechanical properties with respect to similar NR compounds without coupling agents. The reason for these improvements lies in the polar nature of ENR which interacts strongly with the silica surface by hydrogen bonding mechanism. This does not happen when NR or another non‐polar rubber component is used. Thus, in this latter case the use of silane coupling agents to make the silica surface more non‐polar and hydrophobic is needed to have a good reinforcing effect and overall performances from the composite studied.  相似文献   

16.
The study aimed to prepare sustainable and degradable elastic blends of epoxidized natural rubber (ENR) with poly(lactic acid) (PLA) that were reinforced with flax fiber (FF) and montmorillonite (MMT), simultaneously filling the gap in the literature regarding the PLA-containing polymer blends filled with natural additives. The performed study reveals that FF incorporation into ENR/PLA blend may cause a significant improvement in tensile strength from (10 ± 1) MPa for the reference material to (19 ± 2) MPa for the fibers-filled blend. Additionally, it was found that MMT employment in the role of the filler might contribute to ENR/PLA plasticization and considerably promote the blend elongation up to 600%. This proves the successful creation of the unique and eco-friendly PLA-containing polymer blend exhibiting high elasticity. Moreover, thanks to the performed accelerated thermo-oxidative and ultraviolet (UV) aging, it was established that MMT incorporation may delay the degradation of ENR/PLA blends under the abovementioned conditions. Additionally, mold tests revealed that plant-derived fiber addition might highly enhance the ENR/PLA blend’s biodeterioration potential enabling faster and more efficient growth of microorganisms. Therefore, materials presented in this research may become competitive and eco-friendly alternatives to commonly utilized petro-based polymeric products.  相似文献   

17.
SE6450硅橡胶的低温拉伸性能研究   总被引:2,自引:0,他引:2  
研究了航空硅橡胶SE6450的低温拉伸性能。结果表明,在低温下拉伸时,SE6450硅橡胶的力学性能受低温结晶效应和体积收缩效应的综合影响,拉伸强度增大,在-70℃可达15MPa,而伸长率和撕裂强度呈现先增加后降低的趋势。  相似文献   

18.
Natural rubber/high-density polyethylene (NR/HDPE) blend with rice husk (RH) filler and liquid natural rubber (LNR) as the compatibilizer was prepared using an internal mixer at 140°C and 50 rpm. The reinforcing effect and compatibilizing performance of the added reagents in the composites were evaluated from the mechanical and thermal properties, and blend homogeneity. The tensile and impact strength decreased with RH loadings in the matrix, while the tensile modulus and hardness showed an opposite trend. The weak filler–matrix interaction, resulting in poor filler dispersion and large agglomerated particle size, caused those properties to decrease. However, the mechanical properties of the composites improved with the addition of NR or LNR into the matrix. The dissolution effect caused interactions between the phases, leading to an improvement in the compatibility in the blend. Changes in morphology resulted in the shift of T g of the amorphous part of NR to higher temperatures, as observed in differential mechanical analysis (DMA) thermograms. Scanning electron microscopy (SEM) micrographs of the fractured surface had also revealed the good RH–matrix interaction and, thus, the dispersion of particles in samples with added LNR.  相似文献   

19.
天然橡胶的热氧老化研究   总被引:4,自引:0,他引:4  
为了改善天然橡胶的热氧老化性能,试验了防老剂D提纯品和工业品对天然橡胶热氧老化性能的影响,调试了其热氧化诱导期、热失重、热老化的性能变化。结果表明:含杂少纯度高的防老剂D使天然橡胶的抗热氧老化得到改善。  相似文献   

20.
微生物凝固天然橡胶热降解研究   总被引:2,自引:0,他引:2  
用热重分析(TG)研究微生物凝固天然橡胶在30℃~600℃的热降解行为,探讨微生物凝固工艺对天然橡胶热稳定性的影响。结果表明,微生物凝固天然橡胶的热降解是一步反应,主要发生在300℃~450℃之间,为放热反应。起始降解温度To=332.3℃,最大降解速率温度Tp=377.3℃,终止降解温度Tf=445.2℃。酸凝固天然橡胶的To、Tp都比微生物凝固天然橡胶的低,证明微生物凝固天然橡胶的热稳定性比酸凝固天然橡胶的好。  相似文献   

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