填充剂Austin Black在全钢载重子午线轮胎气密层胶中的应用

试验研究填充剂Austin Black和IIR再生胶在全钢载重子午线轮胎气密层中的应用效果.结果表明,随着填充剂Austin Black用量的增大,硫化胶的拉伸强度和拉断伸长率有所降低,气密性明显提高;随着IIR再生胶用量的增大,硫化胶的拉伸强度和拉断伸长率略有下降,拉断永久变形稍有增大;添加10份填充剂Austin Black和30份IIR再生胶,硫化胶的气密性明显提高,其它物理性能变化不大,胶料的混炼和挤出工艺性能明显改善,成品轮胎性能良好.改进配方后,单胎成本降低约6.50元.     

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。     

新型解联剂及再生助剂用量对废胎面胶胶粉再生效果的影响

采用自主研发的双螺杆挤出机对废胎面胶胶粉进行再生,研究了新型解联剂以及活化剂580、石蜡油和柠檬烯等再生助剂的用量对再生胶力学性能的影响。结果表明,适量的新型解联剂、活化剂580、石蜡油和柠檬烯能够提高再生胶的力学性能,当再生胶基础配方中新型解联剂、活化剂580、石蜡油、柠檬烯用量分别为3,2,3,1份时,废胶粉的再生效果最佳,综合力学性能最好。     

动态硫化工艺对丁基橡胶/聚丙烯热塑性硫化胶性能的影响

考察了3种不同动态硫化工艺(M 1、M 2和M 3)对丁基橡胶(IIR)/聚丙烯(PP)热塑性硫化胶(TPV)结构与性能的影响,并考察了转子转速和动态硫化时间对IIR/PP TPV物理机械性能的影响。结果表明,不同动态硫化工艺制备的TPV的Payne效应均随着应变的增大而减小,采用M 3工艺制备的TPV的网络结构最强。采用3种工艺制备的TPV的拉伸强度由大到小依次为:M 3、M 2、M 1。采用M 2和M 3工艺制备的TPV中IIR与PP相容性较好。不同动态硫化工艺制备的TPV中IIR均呈不规则长条状分散在PP中,采用M 1工艺制备的TPV中交联IIR颗粒的尺寸最大,采用M 3工艺制备的TPV中交联IIR相颗粒和滑石粉填料分散较均匀。随着动态硫化过程中转子转速的提高及动态硫化时间的延长,采用M 3工艺制备的TPV的拉伸强度和扯断伸长率均先增加后减小。当转子转速为80 r/min、动态硫化时间为5 min时,IIR/PP TPV的物理机械性能较好。     

利用超临界二氧化碳流体制备丁基再生胶的研究

利用超临界二氧化碳流体对硫黄硫化丁基橡胶(IIR)进行脱硫制备丁基再生胶(RIIR),分别利用硫黄和树脂硫化体系对RIIR/IIR并用胶进行再硫化,并对其性能进行研究。结果表明:当脱硫反应条件为反应温度180℃、压力14.1MPa、时间120min、脱硫剂DD用量占IIR硫化胶的8%时,RIIR中溶胶组分质量分数为0.985。采用硫黄和树脂硫化RIIR/IIR并用胶,随着RIIR用量的增大,并用胶的转矩减小,焦烧时间和硫化时间延长;纯RIIR不能被硫黄硫化,但能被树脂硫化;并用胶的气体阻隔性能和热稳定性不受影响;树脂硫化并用胶的物理性能比硫黄硫化并用胶好。     

利用超临界二氧化碳流体制备丁基再生胶的研究

利用超临界二氧化碳流体对硫黄硫化丁基橡胶(IIR)进行脱硫制备丁基再生胶(RIIR),分别利用硫黄和树脂硫化体系对RIIR/IIR并用胶进行再硫化,并对其性能进行研究。结果表明：当脱硫反应条件为反应温度180 ℃、压力14.1 MPa、时间120 min、脱硫剂DD用量占IIR硫化胶的8%时,RIIR中溶胶组分质量分数为0.985。采用硫黄和树脂硫化RIIR/IIR并用胶,随着RIIR用量的增大,并用胶的转矩减小,焦烧时间和硫化时间延长;纯RIIR不能被硫黄硫化,但能被树脂硫化;并用胶的气体阻隔性能和热稳定性不受影响;树脂硫化并用胶的物理性能比硫黄硫化并用胶好。     

再生废丁基橡胶及其性能研究

以硫黄硫化的废旧丁基橡胶内胎为研究对象,利用转矩流变仪进行再生,研究了再生助剂及再生温度、再生时间、转子转速对再生胶门尼黏度和物理机械性能的影响。结果表明,再生时间延长、温度升高或提高转速均能降低再生胶的门尼黏度,且加入再生助剂后,门尼黏度下降幅度增大。两种情况下,拉伸强度及拉断伸长率均随再生时间的延长或再生温度的升高先增大后减小;未添加再生助剂时,拉伸强度及拉断伸长率随转速提高呈下降的趋势。由于时间与温度累积的热效应超过大分子主链C—C键的键能或机械剪切力过大时,造成主链断裂,使再生胶物理机械性能下降。因此,利用转矩流变仪再生废丁基橡胶的最佳配方为:活化剂为0.7质量份,石蜡油为2质量份;最佳工艺条件为:再生温度为220℃,再生时间为10min,转速为45r/min。     

混炼工艺对炭黑/NR胶料性能的影响

研究混炼工艺对炭黑在NR中的分散性及其硫化胶性能的影响。结果表明:提高填充因数、转子转速和起始温度,胶料转矩和能量消耗增大,升温速率和排胶温度升高,混炼时间缩短;选择适中的填充因数和混炼时间,提高转子转速、起始温度和采用分段降速混炼均有利于提高炭黑的分散性;当炭黑分散性较好时,炭黑/NR硫化胶的物理性能、动态力学性能和耐磨性能提高,压缩生热降低。     

0.3L密炼机混炼工艺的实验研究

为了研究0.3L密炼机的混炼工艺参数对混炼胶性能的影响,本文采用半钢子午胎配方0°转子相位和90°转子相位下分别设置不同的工艺参数进行混炼.由混炼胶的流动性能和硫化胶的机械性能确定最佳工艺参数为:填充系数0.65、混炼时长300 s、转子转速80 r/min.     

混炼工艺对氢化丁腈橡胶性能的影响

研究了排胶温度、混炼时间、转子转速和混炼段数对氢化丁腈橡胶门尼粘度、硫化特性和力学性能的影响.结果表明,转子转速越高,混炼胶门尼粘度越大,混炼效果越差;混炼温度较高且混炼时间适中时,可获得较高MH,反之,MH较低;混炼温度越高且混炼时间越长,t90越短;混炼温度和混炼时间对拉伸强度和拉断伸长率的影响有限,但合适的混炼温...     

转子转速对乙烯-乙酸乙烯酯共聚物/三元共聚尼龙热塑性硫化胶性能的影响

使用密炼机,采用动态硫化工艺制备了乙烯-乙酸乙烯酯共聚物/三元共聚尼龙热塑性硫化胶（EVM/tPA TPV）和乙烯-乙酸乙烯酯-甲基丙烯酸缩水甘油酯共聚物/三元共聚尼龙热塑性硫化胶（EVM-GMA/tPA TPV）,研究了转子转速对两种热塑性弹性体体力学性能和耐热油等性能的影响。结果表明,在一定范围内提高转子转速,热塑性弹性体的力学性能呈上升趋势,当转子转速为80 r/min时,两种热塑性弹性体的综合力学性能最佳;当转子转速达到60 r/min以上时,两种热塑性弹性体的耐热油性能良好;随着转子转速的增加,两种热塑性弹性体的弹性得到改善;在相同转子转速条件下,EVM-GMA/tPA TPV比EVM/tPA TPV具有更好的力学性能、弹性和耐热油性能。     

转矩流变仪制备再生胶的工艺及性能

利用转矩流变仪的高温剪切作用并添加再生活化剂420对废旧轮胎胶粉(GTRP)进行了再生,讨论了活化剂用量和加工温度对再生胶再生程度及力学性能的影响。结果表明,随着活化剂用量的增大和温度的上升,GTRP溶胶含量明显上升,门尼粘度和交联密度均明显下降。转子转速为50r/min,加工时间为15min,加工温度为170℃,活化剂420用量为0.5份时,所得再生胶具有最佳综合力学性能。     

充油反式-1,4-聚异戊二烯橡胶的研制及性能

采用干法充油工艺,对用负载钛体系催化异戊二烯本体沉淀聚合得到的高门尼粘度反式-1,4-聚异戊二烯(TPI)的充油工艺性能及充油橡胶的性能进行了研究.结果表明,随着充油量的增加,充油生胶的可塑性增大,混炼行为得以改善,但高填充油份数的生胶放置中有喷油现象;充油生胶的屈服强度、拉伸强度、拉断伸长率、定伸应力均下降;充油硫化胶的拉伸强度、拉断伸长率、100%定伸应力及回弹值均下降,撕裂强度在充油量为37.5份时出现极大值,硬度先增大到极大值后又略有减小,磨耗量增大,抗湿滑性提高.综合考虑,高门尼粘度TPI充油量以37.5份左右为宜.     

Effect of the doses and nature of vegetable oil on carbon black/rubber interactions: Studies on castor oil and other vegetable oils

The effects of additives in various vegetable oils on the physical, mechanical, and adhesion properties of carbon black/rubber compounds were studied. Various doses of castor oil and some other oils such as paraffin oil, vegetable oil 1, and cashew nut shell liquid (CNSL) at a fixed dose (1 phr) were used. With an increase in the castor oil content, the modulus, tear strength, and tensile strength increased, whereas the hardness and adhesive strength exhibited little variation up to 1 phr. Beyond 1 phr castor oil, the modulus, tear strength, and hardness decreased, whereas the adhesive and tensile strengths increased up to 2.5–3 phr and then decreased. Therefore, castor oil seemed to behave as a coupling agent up to 1 phr and as a coupling agent and a plasticizer in the range of 1–3 phr; beyond that, the main role of castor oil was plasticization. When various oils at a fixed dose (1 phr) were compared, it was found that the vegetable oils exhibited enhanced properties in comparison with those of paraffin oil. In addition, both of the unsaturated oils (castor oil and vegetable oil 1) enhanced physical and mechanical properties in comparison with saturated paraffin oil. CNSL exhibited the best adhesion properties against mild steel and galvanized iron substrates. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 87: 1574–1578, 2003     

Effect of the processing parameters on the surface resistivity of acrylonitrile–butadiene rubber/multiwalled carbon nanotube nanocomposites

In this study, acrylonitrile–butadiene rubber (NBR) was melt‐mixed with multiwalled carbon nanotubes (MWCNTs). Because the electrical conductivity and mechanical properties of composites are strongly influenced by the filler's state of dispersion and the extent of filler breakage during processing, the processing conditions are very important parameters. The effects of the mixing time, rotor speed, cooling rate, and sulfur concentration on the surface resistivity were investigated. Increasing the rotor speed from 20 to 60 rpm at mixing times of 15 and 30 min led to an increase in the surface resistivity from around 10⁴ to 10¹¹ Ω/square. However, at a mixing time of 7 min, the surface resistivity slightly decreased with increasing rotor speed. When slow cooling was applied, a surface resistivity of 10⁴ Ω/square was obtained at around 2‐phr MWCNTs. However, when the fast cooling was applied, a surface resistivity of 10⁶ Ω/square was obtained at 5‐phr MWCNTs. The tensile strength and tensile modulus at 300% elongation were improved with the addition of MWCNTs into NBR. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

高耐磨炭黑填充型粉末SBR研究Ⅱ.硫化胶的物理机械性能

研究了高耐磨炭黑(N330)填充型粉末丁苯橡胶[P(SBR／N330)]硫化胶的物理机械性能。结果发现。炭黑乳化剂的用量、炭黑改性剂和包覆剂的用量及玻璃化转变温度对P(SBR／N330)硫化胶的物理机械性能的影响比较明显。在适宜的粉末化条件下制备的P(SBR／N330)，其硫化胶的物理机械性能与块状SBR／N330通过机械混炼得到的硫化胶的物理机械性能处于相同水平。P(SBR／N330)硫化胶拉伸断面形貌的SEM分析表明，包覆剂在用量为5份时形成的粒子与SBR基体结合紧密，在用量为15份时形成的粒子较易剥离。     

动态硫化IIR/PP热塑性弹性体的结构与性能Ⅰ.软化和填充体系对IIR/PP TPV结构和性能的影响

研究了软化剂环烷油和填料二氧化硅的用量对丁基橡胶／聚丙烯热塑性硫化胶(IIR／PP TPV)结构和性能的影响，尤其对流动性能和弹性性能进行了研究。并首次通过稀释法清楚地观察到IIR／PP TPV的微观结构。结果表明，软化剂油对TPV的流动性能影响非常显著，软化剂油能大大改善TPV的流动性能；填料对TPV的增强效果不是很明显。在此基础上，提出了改善TPV流动性新的机理及思路：加入软化剂油使橡胶在动态硫化过程中破碎效应增强，同时在动态硫化过程中，会有一定量的软化剂油迁移进入聚丙烯造成基体黏度降低，正是这2种效应改善了TPV的流动性。使用软化剂调整TPV的硬度也是非常有效的，而不一定要通过调整橡塑比。     

Reclaiming of ground rubber tire by a novel reclaiming agent. I. virgin natural rubber/reclaimed GRT vulcanizates

Mechanochemically devulcanized ground rubber tire (GRT) was (re)vulcanized in compositions with virgin natural rubber (NR). The NR/GRT (re)vulcanizates with GRT content from 20 to 60 wt% have been prepared and studied. Reclaiming of GRT was successfully carried out by tetra methyl thiuram disulfide (TMTD) in presence of spindle oil at around ambient temperature. The cure characteristics and mechanical properties of the virgin NR/reclaim GRT blend were studied. The optimum cure time decreases but scorch time remain unaltered with increasing reclaim rubber content in the blend. Effect of carbon black was studied in NR/RR (80/20) blend. Ageing characteristics of different NR/RR blends were evaluated. Scanning electron microscopy (SEM) studies further indicate the coherency and homogeneity in the NR/RR vulcanizate. The dynamic mechanical properties and swelling behavior of NR/RR blend vulcanizates were examined. The elastic and storage modulus of the NR/RR vulcanizates become improve with increasing reclaim rubber content. Electrical properties of NR/RR vulcanizates were also studied. POLYM. ENG. SCI., 47:1091–1100, 2007. © 2007 Society of Plastics Engineers     

影响IIR／CIIR并用体系力学性能的几个因素

研究了ＩＩＲ／ＣＩＩＲ不同并用比例、不同硫化体系、树脂用量、炭黑品种及用量、操作油种类等对ＩＩＲ／ＣＩＩＲ并用硫化胶力学性能的影响。结果表明：当ＩＩＲ／ＣＩＩＲ并用比例为８０／２０时,并且采用树脂作交联剂进行硫化,所得硫化胶的拉伸强度、扯断伸长率以及撕裂强度都有较好的结果,拉伸强度达到１９．８ＭＰａ,伸长率为６４０％;当树脂用量为１０ｐｈｒ时,硫化胶的永久变形只有４％,硬度为５４度;当ＩＳＡＦ用量