改性白炭黑对天然橡胶和环氧化天然橡胶共混物力学性能的影响

研究了白炭黑对天然橡胶和环氧化天然橡胶（NR／ENR）共混物的补强性能以及改性剂的品种和用量对白炭黑分散效果的影响。结果表明，间苯二酚六次甲基四胺（PY）、硅烷偶联剂KH-550、Si-69这3种改性剂对白炭黑都起到了很好的改性作用。PY以40／60的质量比把间苯二酚和六次甲基四胺溶解、混合所得的络合物的改性效果最好，其中硅烷偶联剂Si-69和KH-550的最佳用量以白炭黑质量用量的9％为宜。     

白炭黑对NR/ENR并用胶性能的影响

研究经间苯二酚六次甲基四胺络合物（PY）改性前后的白炭黑对天然橡胶（NR）/环氧化天然橡胶（ENR）并用胶性能的影响。结果表明,随着未改性的白炭黑用量增大,胶料的t10和t90均延长,ML和MH均呈上升趋势,胶料的物理性能先提高后降低,当白炭黑用量为5～10份时,胶料的物理性能较佳。间苯二酚/六次甲基四胺并用比为40/60制备的PY且其用量为1份时对白炭黑的改性效果最好。     

改性废胶粉对氯丁橡胶性能的影响

将经间苯二酚和六次甲基四胺改性的废胶粉与氯丁橡胶(CR)共混,制备改性废胶粉/CR共混物。研究了废胶粉的改性方法对共混物性能的影响,并探讨了废胶粉用量对共混物硫化特性和物机性能的影响。研究结果表明:废胶粉经间苯二酚和六次甲基四胺改性后,共混物的综合力学性能较未改性废胶粉的提高,Tg变化不大。     

改性剂对废胶粉/高密度聚乙烯热塑性弹性体性能的影响

研究废胶粉(WRP)改性剂对共混型WRP/高密度聚乙烯(HDPE)热塑性弹性体性能的影响。结果表明:采用间苯二酚/六亚甲基四胺(质量比1/0.7)、偶联剂Si69和偶联剂KH-550改性WRP,且质量分数分别为6%,9%和6%时,热塑性弹性体综合性能较好;3种改性剂中间苯二酚/六亚甲基四胺的改性效果最佳。     

硅烷偶联剂对白炭黑与CM/SBR的填料网络及动态性能的影响

采用偶联剂Si-69对白炭黑进行改性。实验表明,随着偶联剂Si-69用量的增多,填料在胶料中的分散性提高,使CM/SBR(氯化聚乙烯/丁苯橡胶)共混胶的力学性能提高,硫化胶的耐老化性能提高,Si-69的加入使白炭黑与橡胶基质的相容性提高,Payne效应减弱。     

改性淀粉对炭黑填充丁苯橡胶/顺丁橡胶并用胶性能的影响

用改性淀粉替代部分炭黑填充丁苯橡胶(SBR)/顺丁橡胶(BR)并用胶,考察了改性淀粉用量及偶联剂种类对混炼胶硫化特性及硫化胶物理机械性能和动态力学性能的影响.结果表明,用改性淀粉替代部分炭黑可对SBR/BR混炼胶的硫化产生明显的延迟作用,但改性淀粉用量的变化对焦烧时间与正硫化时间影响不大;添加偶联剂KH-570或NDZ-201延迟了混炼胶的硫化过程,KH-550能大幅度地促进硫化作用,Si-69对于体系的硫化性能略有影响;随着改性淀粉用量的增加,SBR/BR硫化胶的拉伸性能、耐磨耗性均有所降低,但弹性、动态生热和滞后性能得到了明显改善,改性淀粉最佳用量为5～8份;各种偶联剂均可提高SBR/BR硫化胶的拉伸性能,硅烷偶联剂Si-69和KH-570对弹性和动态生热也略有改善,添加偶联剂KH-550改善了SBR/BR硫化胶的抗湿滑性能,但滞后性能变差,添加偶联剂KH-570或Si-69对SBR/BR硫化胶动态力学性能的影响较小,综合考虑,以添加偶联剂KH-570较好.     

不同硅烷偶联剂改性白炭黑对溶聚丁苯橡胶性能的影响

分别用4种硅烷偶联剂Si-69、KH-550、KH-570和KH-792对白炭黑进行改性,研究硅烷化白炭黑对溶聚丁苯橡胶硫化特性、物理机械性能、微观形态以及动态力学性能的影响。结果表明,加入硅烷偶联剂能够降低溶聚丁苯橡胶混炼胶的门尼黏度,明显提高硫化胶的物理机械性能,降低硫化胶的储能模量和损耗因子,使其Payne效应减弱; 其中用偶联剂Si-69改性白炭黑所填充溶聚丁苯橡胶的综合性能最佳,其次是KH-570。     

硅烷偶联剂KH-550和Si-69增容粉煤灰/废胶粉复合材料

采用硅烷偶联剂γ-氨丙基三乙氧基硅烷(KH-550)和双-[γ-(三乙氧基硅)丙基]四硫化物(Si-69)对粉煤灰(FA)/废胶粉(URP)复合材料进行增容,考察了偶联剂用量和加入方式对复合材料性能的影响,并对复合材料的结构和微观形貌进行了表征。结果表明,KH-550和Si-69均可以改善FA与URP的相容性,提高复合材料的力学性能;Si-69的增容效果好于KH-550,最佳的Si-69/FA/URP(质量比)为1.0/40/100。采用硅烷偶联剂与FA混合、再与URP混合的分步加入方式,与同步加入方式相比,制备的复合材料更易成型,且复合材料的力学性能、耐磨性能和耐热老化性能更好。与KH-550相比,用Si-69改性的FA/URP复合材料,其相界面更为模糊,无孔洞。硅烷偶联剂改性的FA/URP复合材料中有Si—O生成。     

改性白炭黑-橡胶相互作用和非线性粘弹性研究

选用Si-69利用原位接枝法对白炭黑进行了表面改性并用于天然橡胶的补强,重点考察了不同填料用量下改性白炭黑-天然橡胶的相互作用和非线性粘弹性。结果表明,与未改性白炭黑相比,添加改性白炭黑的胶料结合胶量上升,填料-橡胶相互作用增强,填料在橡胶基体中的分散性更好。胶料应变软化和Payne效应随填料用量的上升而增强。当填料用量小于26份时,天然橡胶/改性白炭黑的应变软化大于天然橡胶/白炭黑的。超过26份后,情况反转。     

偶联剂对白炭黑／SBR复合材料力学性能的影响

研究了4种偶联剂KH-550、KH-792、WD-60和HG-305对白炭黑／SBR复合材料力学性能和热空气老化性能的影响。研究结果表明：当KH-550用量为4．0份时,复合材料的综合力学性能最好,与未改的白炭黑／SBR复合材料相比,其拉伸强度和撕裂强度分别提高了77％和24％;复合材料的老化实验结果表明,经偶联剂改性的复合材料的耐热老化性能有所下降,其中HG-305改性的复合材料抗老化性较好。     

改性氧化锌晶须对丁腈橡胶性能的影响

分别采用偶联剂(Si—69,NDZ—201,KH—550)对氧化锌晶须进行表面改性,研究了改性氧化锌晶须对丁腈橡胶性能的影响。结果表明:Si—69改性氧化锌晶须补强的NBR橡胶物理机械性能、耐老化性能、耐液体性能等优异,效果较KH—550和NDZ—201的好,用量为4份时硫化胶综合性能较好。     

Interaction Between Fumed-Silica and Epoxidized Natural Rubber

Epoxidized natural rubber (ENR)/fumed silica vulcanizates were prepared by mechanical mixing method. Fumed silica content can affect mechanical properties of the composites, and ten parts per hundreds of rubber (phr) fumed silica lead to the best tensile strength. The interaction between ENR and fumed silica was characterized by Kraus equation, crosslink density (tested by NMR), Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), dynamic mechanical analysis (DMA) and scanning electron microscope (SEM). The results showed that the dispersion of silica in ENR was better than in natural rubber (NR), hydrogen bond was produced between ENR and fumed-silica in ENR/silica blends, and glass transition temperature of ENR/silica vulcanizate was higher than pure ENR vulcanizate. TGA and DMA confirmed that there was intense interaction between ENR and silica.     

环氧化天然橡胶复合材料性能研究

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。     

动态硫化EPDM／PoE热塑性弹性体补强体系的研究

采用动态硫化法制备了EPDM／POE热塑性弹性体（TPV）。研究了炭黑、白炭黑和经si69预处理的白炭黑对TPV性能的影响。结果表明,经Si-69预处理的自炭黑补强的TPV力学性能和热性能,明显高于普通白炭黑。3种补强对比,炭黑N330补强效果最好,当炭黑用量为30份时,综合力学性能最佳,且此时炭黑在体系中的分散性也较好。     

偶联剂改性对磁敏NR/SBR并用胶性能的影响

将NR和SBR与改性羰基铁粉机械共混制备磁敏NR/SBR并用胶,研究偶联剂KH-550,KH-560,KH-570和NDZ-401改性羰基铁粉对磁敏NR/SBR并用胶的物理性能和磁流变效应的影响。结果表明:不同偶联剂改性的羰基铁粉对NR/SBR并用胶性能有一定的影响;采用偶联剂KH-570改性的羰基铁粉填充的NR/SBR并用胶表现出较好的物理性能和磁流变效应。     

Natural rubber/ethylene propylene diene blends for high insulation iron crossarms

This research studied the composition and behavior of natural rubber (NR) and ethylene propylene diene monomer (EPDM) blends at various carbon black concentrations (0–30 phr) in terms of electrical resistivity, dielectric breakdown voltage testing, and physical properties. The blends having electrical properties suitable for application in high‐insulation iron crossarms were selected for investigation of compatibility and increased physical properties. The effect of the homogenizing agent concentration on improvement of compatibility of blends was studied by scanning electron microscopy, pulsed nuclear magnetic resonance spectroscopy, and rheology techniques. We also examined mechanical properties such as tensile strength, tear strength, elongation at break, and hardness. The NR/EPDM blends filled with a fixed concentration of silica were investigated for ozone resistance. A carbon black content as high as 10 phr is still suitable for the insulation coating material, which can withstand electrical voltage at 10 kVac. Addition of the homogenizing agent at 5 phr can improve the mechanical compatibility of blends, as evidenced by the positive deviation of shear viscosity of the rubber blend, that is, the calculated shear viscosity being higher than that of experimental data. Moreover, the pulsed NMR results indicated that the spin‐spin relaxation (T₂) of all three components of the rubber blend was compressed upon the addition of the homogenizing agent. The ratio of NR/EPDM in the blend to best resist the ozone gas is 80/20 with the addition of silica of 30 phr into the blend. Also, the NR/EPDM filled with silica had a decreased change in thermal and mechanical properties of blends after thermal aging. The synergistic effect of silica content and high NR content (80) in 20 phr EPDM could improve antioxidation by ozone in the absence of a normal antioxidant for natural rubber. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 3401–3416, 2004