硅藻土/nano-MoS2复合改性氟橡胶的摩擦磨损性能研究

采用红外光谱仪、无转子硫化仪、环-块摩擦试验机、电子和光学显微镜等测试分析手段,重点考察了改性硅藻土及其与纳米二硫化钼(nano-MoS2)复合对氟橡胶(FKM)复合材料摩擦磨损性能的影响.结果表明,随着改性硅藻土含量的增加,FKM硫化胶的摩擦系数和磨损体积均呈现出逐渐降低的趋势;当改性硅藻土含量达到45 phr时,硫...     

ACM/NBR共混胶性能的研究

探究了共混比对丙烯酸酯橡胶/丁腈橡胶(ACM/NBR)共混胶的硫化特性、力学性能、耐热老化性能、耐油性能、高温压缩永久变形性能和低温性能的影响。研究表明,采用TCY/S/促进剂的硫化体系时,在ACM中并用少量的NBR可以显著地提高硫化速度,最高扭矩也随着NBR用量的增加而增加,并用5 phr NBR后,共混硫化胶的拉伸强度与纯ACM硫化胶相比,提高了近17%,但NBR的并用量由5 phr增加到25 phr时,硫化胶的力学性能变化不大。随着NBR用量增加,共混硫化胶的耐热老化性能和耐油性能均变差,但高温压缩永久变形减小,耐寒性有较大改善。     

固体润滑剂对丁腈橡胶摩擦磨损和噪声性能的影响

采用机械共混法添加石墨、二硫化钼(MoS_2)、聚四氟乙烯(PTFE)三种固体润滑剂对丁腈橡胶进行改性。通过力学性能试验和环块摩擦磨损试验研究不同填料比例对丁腈橡胶力学性能和摩擦磨损性能的影响,并利用振动测试分析系统对比了不同填料比例下改性丁腈橡胶的减振降噪性能。结果表明,固体润滑剂的加入提高了丁腈橡胶的机械强度;在载荷为66 N的干摩擦条件下平均摩擦因数最多降低了34%,体积磨损率最多降低了62%;减振降噪性能也得到增强,添加3 phr石墨、3 phr MoS_2、12 phr PTFE时,改性丁腈橡胶的减振降噪性能最好。     

改性微晶纤维素的制备及其对填充丁苯橡胶性能的影响II 改性棉纤维素对填充丁苯橡胶性能的影响

研究了微晶纤维素(MCC)和改性微晶纤维素(MMCC)的用量对丁苯橡胶(SBR)硫化胶物理机械性能的影响,以及分别填充20phrMCC和MMCC的SBR复合材料的耐磨性和动态力学性能分析。结果表明,当MCC和MMCC的用量都为20phr时,硫化胶有最大的拉伸强度,分别为15.3MPa和19.0MPa;填充MMCC的SBR复合材料的磨耗体积比填充MCC的降低了41%;填充20phr的MCC和MMCC的SBR具有相似的玻璃化温度。     

纳米SiC及其与石墨、二硫化钼填充PTFE基复合材料摩擦磨损性能研究

用摩擦磨损试验机对纳米碳化硅（SiC）及其与石墨、二硫化钼（MoS2）混合填充聚四氟乙烯（PTFE）复合材料在干摩擦条件下与45#钢对磨时摩擦磨损性能进行了研究,用洛氏硬度计对PTFE及其复合材料的硬度进行了测量,用扫描电子显微镜对PTFE复合材料磨损表面进行了观察。结果表明,纳米SiC的加入能提高PTFE复合材料的硬度和耐磨性,纳米SiC与MoS2混合填充会使PTFE复合材料的耐磨性提高更多,特别是在载荷增大时其耐磨效果更好。纳米SiC填充PTFE复合材料的摩擦因数比纯PTFE大,且随载荷增加有所减小, MoS2、石墨的加入可降低PTFE的摩擦因数。     

纳米SiO_2填充改性聚四氟乙烯复合材料的摩擦磨损性能研究

通过冷压烧结成型工艺制备了纳米二氧化硅(SiO_2)填充改性聚四氟乙烯(PTFE)复合材料,探究了不同添加比例的纳米SiO_2/PTFE复合材料在不同转速下摩擦磨损情况。采用三维视频显微镜观察了样品的表面磨痕深度,借助扫描电镜观察摩擦表面形貌并分析磨损机理。结果表明,填充纳米SiO_2后的PTFE复合材料其摩擦因数虽有一定程度的升高,但其体积磨损率却大幅降低。且当纳米SiO_2填充质量分数为5%时,复合材料的体积磨损率降到最低,并在转速为80 r/min时较纯PTFE降低了89.5%。观察分析微观形貌发现,随着纳米SiO_2含量的增大,复合材料的磨损机理逐渐由犁耕磨损和黏着磨损向磨粒磨损转变,且当纳米SiO_2填充含量为10%时,出现轻微的疲劳磨损。     

硫化剂TCY/硫黄并用硫化体系对ACM性能的影响

研究硫化剂TCY/硫黄并用硫化体系对丙烯酸酯橡胶(ACM)性能的影响.结果表明,硫化剂TCY和硫黄用量对ACM硫化胶的耐油性能影响不大;当硫化剂TCY用量为1.5份、硫黄用量为0.3份时,ACM胶料的硫化速度较快,硫化胶各项性能较好,特别是耐热空气老化性能优异.     

混杂填料增强聚四氟乙烯复合材料的摩擦学性能研究

采用MM-200型摩擦磨损试验机对纳米SiC、MoS2和石墨填充聚四氟乙烯(PTFE)复合材料在干摩擦条件下与45#钢对摩时的摩擦磨损性能进行了研究,探讨了MoS2、石墨及纳米SiC的协同效应。认为纳米SiC的加入大大提高了复合材料的承载能力,石墨、MoS2的加入减少PTFE复合材料的摩擦因数。利用扫描电子显微镜(SEM)对PTFE复合材料的摩擦面进行了观察。结果表明:实验中5%nano-SiC和3%MoS2填充PTFE复合材料的摩擦磨损性能最好,且在高载荷下的摩擦磨损性能尤为突出,具有一定的应用价值。     

无机填料增强改性超高相对分子质量聚乙烯的研究

采用超细白云母和针状硅灰石两种无机填料对超高相对分子质量聚乙烯(PE-UHMW)进行填充改性,并用单螺杆挤出机进行成型,研究不同用量的无机填料对PE-UHMW复合材料的力学性能、耐热性能和摩擦磨损性能等的影响。结果表明,添加适量的针状硅灰石、超细白云母均可提高PE-UHMW的拉伸强度、表面硬度、热变形温度和耐磨性,其中以超细白云母的效果最佳,针状硅灰石的效果稍差。当超细白云母的填充量为5%时,PE-UHMW的拉伸强度提高了28.7%,热变形温度提高了16℃,磨损量降低了58.3%;当云母的含量达到15%时,PE-UHMW的摩擦因数降低了26.8%。     

甲基丙烯酸原位改性纳米碳酸钙增强丁苯橡胶

用甲基丙烯酸(MAA)原位改性纳米碳酸钙增强丁苯橡胶(SBR),考察了过氧化二异丙苯(DCP)、纳米碳酸钙用量对SBR混炼胶硫化特性及硫化胶力学性能的影响,分析了纳米碳酸钙填料与SBR橡胶基体之间的相互作用。结果表明,适量地加入DCP和MAA原位改性纳米碳酸钙,可降低SBR混炼胶的硫化速率;当改性纳米碳酸钙用量为80份、DCP用量为1.0份时,SBR硫化胶的拉伸强度达到12.8MPa,扯断伸长率为620%;MAA可使纳米碳酸钙与SBR基体之间的作用力明显增强。     

填料改性氟橡胶的制备及性能研究

针对氟橡胶加工性能不良、耐磨性差、价格昂贵的问题,以耐磨炭黑和白炭黑为增强填料,二硫化钼为减磨填料对其进行改性,考察了不同填料种类及用量对氟橡胶力学及耐磨性能的影响。结果表明：炭黑和白炭黑用量分别为25份和20份时硫化胶的综合性能最优,在此基础上,随着二硫化钼用量的增加,炭黑增强氟橡胶的摩擦系数减小,耐磨性提高,但力学性能有所降低;对于白炭黑增强氟橡胶体系,随着二硫化钼用量增大,耐磨性和力学性能均先减小后增大。     

短切碳纤维对天然橡胶/顺丁橡胶复合材料性能的影响

以天然橡胶(NR)和顺丁橡胶(BR)为基料,以短切碳纤维(SCF)为添加剂,制备了SCF/NR/BR复合材料,考察了SCF用量对NR/BR的摩擦性能及力学性能的影响。结果表明,SCF可增强NR/BR基体的强度,增大其硬度。在NR/BR混合胶中加入15份SCF可以降低混合胶的摩擦系数,减少混合胶的磨损量,提高混合胶的耐磨性能。SCF增强的NR/BR在摩擦过程中发生了磨粒磨损和黏着磨损,形成了卷曲磨屑。     

尼龙6/纳米A12O3复合材料与铜摩擦副的摩擦磨损性能

采用双螺杆挤出机共混制备尼龙6／纳米Al2O3复合材料,考察了复合材料的硬度及与铜摩擦副的摩擦磨损性能。试验表明,加入纳米Al2O3可使尼龙6的硬度提高。在低载荷时,复合材料的摩擦系数随载荷的增加而减小;当载荷超过一定值后,摩擦系数增大;载荷一定时,摩擦系数随纳米A120,含量的增加呈上升趋势。当纳米Al2O3含量达到10份时,复合材料的磨损量较小;当纳米Al2O3超过10份时,纳米Al2O3粒子的团聚会造成其与基体尼龙6的结合力降低,最终导致尼龙6／纳米Al2O3复合材料磨损量增大。     

Effect of crosslinking on the conductivity of conductive silicone rubber

We investigated the effect of polyvinylsilicone oil (C gum) as a crosslinker and 2,5‐bis(tert‐butyl peroxy)‐2,5‐dimethyl hexane (DBPMH) as a curing agent on the conductivity of conductive silicone rubber with two different kinds of conducting mechanisms. The experimental results show that the volume resistivity of conductive silicone rubber changed with its degree of crosslinking. When the carbon black loading was 25 parts per hundred rubber (phr) and a completely continuous conducting network had not formed, the volume resistivity of the vulcanizates decreased with increasing crosslink density. The volume resistivity of the vulcanizate with a suitable amount of C gum decreased to 53%, and the tensile strength increased by 0.8 MPa compared to the vulcanizate without C gum. When the carbon black loading was 40 phr and a completely continuous conducting network had formed, the crosslink density of vulcanizates changed as the amount of DBPMH changed. The volume resistivity of vulcanizates first decreased and then increased with increasing crosslink density. There was a valley value in the resistivity–crosslink density curve. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 3471–3475, 2003     

硅橡胶复合材料的制备及摩擦性能

考察了白炭黑、羟基硅油对硅橡胶复合材料摩擦性能的影响,研究了硅橡胶复合材料在干、湿光滑玻璃表面摩擦系数的影响因素及摩擦机理.结果表明,硅橡胶复合材料在光滑玻璃表面的干摩擦系数(fD)与损耗因子(tanδ)/邵尔A硬度(H)、tanδ/剪切储能模量(G')均呈线性正相关,随白炭黑用量的增加,fD降低.当增塑剂用量小于7....     

Fracture behavior of NR and SBR vulcanizates filled with ground rubber having uniform particle size

The use of recycled rubber including ground scrap vulcanizates in rubber compounds was studied. When ground rubber was incorporated into rubber compounds, the physical properties, especially the tensile strength, were deteriorated compared to the virgin rubber compound. Also, incorporating ground rubber caused a change of the cure behavior via migration of sulfur or an accelerator between the virgin rubber matrix and the ground rubber vulcanizate. In this study, the fracture behavior and abrasion property of carbon black‐filled SBR and NR compounds containing ground rubber vulcanizate were investigated. Also, the effect of the particle size or loading volume of ground rubber powder on those properties was studied. Four different sizes, 420–600, 177–250, 125–150, and 75–88 μm, of ambient ground rubber powder recycled from waste tire were selected and used in the compounding. The loading amounts of ground rubber powder were 10, 30, and 50 phr. The flex crack growth of SBR‐ and NR‐based compounds was altered by the addition of ground rubber particles. More delayed crack growth was observed with an increasing loading volume and decreasing particle size of the ground rubber powders, and this behavior was more prominent in SBR than in NR compounds. Tangent delta, a direct measure of internal energy dissipation, increased with an increasing loading volume of the ground rubber particles. The abrasion rate of ground rubber‐filled compounds was more dependent on the size of the abrasion pattern than on the loading level or particle size of the ground rubber powders. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 85: 2491–2500, 2002     

铁粉含量对聚甲醛/铁粉复合材料摩擦磨损性能的影响

采用环块磨损试验机,研究了铁粉含量、载荷、对磨时间以及转速对聚甲醛（POM）/Fe粉复合材料摩擦因数和磨损质量的影响。结果表明,载荷200 N,转速200 r/min的测试条件下,随着Fe粉含量的增加,摩擦因数和磨损质量都呈现先降低后升高的趋势。Fe粉含量4 份时摩擦因数在从纯POM的0.13下降到0.098,试样磨损质量比纯POM降低约50%;在不同的载荷情况下,Fe粉含量4份时的摩擦因数始终最低。     

Friction and wear properties of scrap tire/potassium hexatitanate whisker composites

As a way of solving the environmental problem of waste tires, we developed a new type of friction material made of scrap tire composites with potassium hexatitanate in which rubber formed a continuous phase. The tribological behaviors of the scrap tire rubber composites were investigated by a friction and wear tester under dry conditions. According to the results, the optimum amounts of potassium hexatitanate were 5 phr in terms of the friction and wear properties up to 200 °C. The specimen containing other ingredients showed 0.72 of friction coefficient and 1.03 of wear rate which are highly compatible to those of the commercial ‘Sonata’ motor brake pad when it contains 5, 20, 10, 20, 10 phr of potassium hexatitanate, phenol, cashew, barium sulfate, and copper, respectively.     

Preparation of zinc‐oxide‐free natural rubber nanocomposites using nanostructured magnesium oxide as cure activator

The effect of sol–gel synthesized magnesium oxide (MgO) nanoparticles as cure activator is studied for the first time in the vulcanization of natural rubber (NR) and compared with conventional zinc oxide (ZnO) in terms of cure, mechanical, and thermal properties. The NR vulcanizate with 1 phr (Parts per hundred parts of rubber) nano MgO shows an excellent improvement in the curing characteristics and the value of cure rate index is about 400% greater for NR vulcanizate containing 1 phr nano MgO in comparison to the NR vulcanizate with 5 phr conventional ZnO. Both mechanical and thermal properties of NR vulcanizate are found to be satisfactory in the presence of 1 phr nano MgO as cure activator in comparison to conventional NR vulcanizate. This study shows that only 1 phr nano MgO can successfully replace 5 phr conventional ZnO with better resulting properties in the sulfur vulcanization of NR. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42705.