串联密炼机一次法低温混炼工艺生产乘用轮胎胎面胶

采用串联密炼机一次法低温混炼工艺生产乘用轮胎胎面胶,并与传统密炼机混炼工艺进行对比。结果表明:与传统混炼工艺相比,采用串联密炼机一次法低温混炼工艺生产的混炼胶F_(max)提高,焦烧时间t_5延长,胶料的加工安全性提高;硫化胶定伸应力、拉伸强度和回弹值提高,耐磨性能改善;炭黑分散性和硫黄分散程度明显改善;胶料混炼能耗降低,生产效率提高,胶料质量更加稳定。     

混炼工艺对NR/SBR/BR/TRR农业轮胎胎面胶性能的影响

研究混炼工艺对天然橡胶(NR)/丁苯橡胶(SBR)/顺丁橡胶(BR)/轮胎再生橡胶(TRR)农业轮胎胎面胶性能的影响。结果表明:胶料混炼适合采用两段混炼工艺,一段混炼为SBR和TRR与部分炭黑混炼,二段混炼为一段混炼胶与NR、BR、剩余炭黑和其他配合剂混炼;随着一段混炼炭黑加入量增大,硫化胶的拉伸强度和撕裂强度呈增大趋势,一段混炼炭黑加入量较大时硫化胶的拉断伸长率较高,耐磨性能较好;一段混炼加入5/6炭黑的混炼工艺硫化胶的炭黑分散性较好,拉伸强度和撕裂强度较大,耐磨性能较好,生热较低,耐热氧老化和耐臭氧老化性能较好。     

混炼工艺对炭黑分散性及胶料力学性能的影响

以胎冠胶为例,研究了混炼工艺对炭发散性及胶料物理性能的影响。结果表明,生胶、小料及炭黑同时加入可获得较好的炭黑分散性,且缩短了混炼时间,同时胶料的３００％定伸应力、撕裂强度较高,耐磨性能改善,屈挠生热明显降低。说明合理优化混炼工艺可以有效地提高胶料中炭黑的分散程度,进而改善胶料的物理性能。     

混炼工艺对SBR/BR/白炭黑胶料性能的影响

研究混炼工艺对丁苯橡胶（SBR）/顺丁橡胶（BR）/白炭黑胶料物理性能和结合胶含量的影响。对于一次投胶混炼法,橡胶对白炭黑的润湿效果好,胶料的拉伸强度和结合胶含量大于分段投胶混炼法胶料。对于分段投胶混炼法,用贫相橡胶控制结合胶时,胶料的拉伸强度和结合胶含量较大;结合胶含量受生胶种类和并用比以及混炼工艺的共同影响;2种生胶的用量越接近,越容易形成结合胶,形成结合胶的白炭黑表面越大;混炼工艺引起的混炼场差异影响结合胶的生成。     

混炼工艺对丁苯橡胶/顺丁橡胶并用胶性能的影响

研究混炼工艺对丁苯橡胶(SBR)/顺丁橡胶(BR)并用胶性能的影响。结果表明:将预处理白炭黑与橡胶浸润后再加入炭黑,填料的分散性提高,胶料的结合胶含量大,物理性能和耐磨性能好;在相同转子转速下,随着混炼温度提高,胶料的强度和耐磨性能总体提高;在相同混炼温度下,随着转子转速增大,胶料的强度和耐磨性能总体提高,生热降低;混炼温度和转子转速过高的胶料综合性能降低;当混炼温度为90℃、转子转速为70 r·min~(-1)时,胶料的综合性能较好。     

低温一次法混炼和传统混炼工艺的对比

对比采用传统混炼工艺和低温一次法混炼工艺的天然橡胶(NR)/顺丁橡胶(BR)并用胶性能,并运用"壳层滑动模型"对其原因进行分析。低温一次法混炼是轮胎行业在胶料混炼工艺方面的重大变革,采用一次法混炼工艺的胶料具有炭黑分散好,硫黄和促进剂均匀程度高,热损失小的特点。     

低温一次法混炼生产线改造

介绍将传统混炼(密炼)生产线改造为低温一次法混炼生产线的情况。改造的低温一次法混炼生产线由密炼机、0#挤出机、1#~4#低温开炼单元、翻胶装置、捣胶装置、胶料输送系统、5#开炼机(出片)和胶片冷却线组成;混炼工艺为生胶、炭黑和小料在密炼机中混炼,混炼胶经挤出机压片后送至低温开炼单元补充混炼,由开炼机自动连续压片,胶片冷却后叠放。低温一次法混炼生产线提高了混炼效率和产能,降低了混炼能耗和胶料成本,提升了混炼胶质量。     

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。     

低温一次法炼胶工艺与传统法炼胶工艺在高结构炭黑配方中的应用

在胎面胶配方中采用高结构 N134炭黑进行大料对比实验,结果表明：一次法炼胶工艺较传统多段炼胶工艺的混炼胶流动性更好,利于后序半成品部件的加工;一次法生产的混炼胶物性及磨耗均优于传统多段混炼胶;同时,低温一次法减少了混炼段数,提高了生产效率;而且一次法也适用于多白炭黑配方胶料的混炼。因此,低温一次法炼胶工艺更能突出其必然优势     

SSM法和传统炼胶工艺生产的胎面胶料性能对比

随着胎面胶配方中白炭黑的大量应用,采用传统法炼胶工艺进行大用量白炭黑混炼是比较困难的,生产出的终炼胶炭黑、白炭黑分散度较差。SSM法炼胶工艺可以提高胶料的机械剪切效率,使炭黑、白炭黑和各种配合剂分散更均匀,有效地避免胶料混炼过程中产生的炭黑、白炭黑凝胶,以及由此引发的胶料黏度下降、压延和挤出等后序加工不便等问题;减少橡胶分子链不可逆化学裂解的发生,增加可逆机械剪切分子链的数量;提高炭黑的补强作用,提升轮胎硫化后的物理性能。     

不同炼胶工艺对半钢轮胎磨耗性能的影响

分析对比不同生产工艺条件下轮胎胎面胶的各项性能,可以看出SSM混炼工艺生产的胎面胶白炭黑和炭黑分散度提升,胶料流动性向好,成品轮胎外观缺陷(花纹圆角、胎冠缺胶等)出现的几率降低;轮胎胎面的疲劳磨耗、胎面的磨损磨耗降低;胎面胶的磨耗体积量,SSM混炼工艺较传统法工艺整体有大幅度降低,相比传统法提升量大于50%。     

国外与国内炭黑对胎面胶料硫化时间的影响

炭黑是橡胶工业主要的补强剂和填充剂,仅次于生胶居橡胶原材料的第二位。炭黑加入橡胶后,可以改善胶料的性能。文章对国外和国产炭黑对胎面胶料硫化时闰的影响进行了对比试验。结果表明,卡博特炭黑能明显提高胶料强力性能,胶料的焦烧时间和正硫化时间相对较短。     

Effect of adding different silane coupling agents on metal friction and wear in mixing process

The function of silane coupling agent in rubber mixing field is to combine inorganic matrix with rubber organic matrix. Silica is commonly used in the rubber mixing field to strengthen rubber. The size and amount of silica aggregates in the mixing process are important factors affecting the wear of the mixing chamber. The wear of the mixing chamber would lead to a increasing gap between the mixer chamber and the rotor, which caused the mixing efficiency reducing. It also affected the dispersion effect, then affected the mechanical and physical properties of the vulcanized rubber. In this paper, the effects of rubber compound on metal friction and wear were studied by using four silane coupling agents commonly used in rubber mixing field. The experiment was carried out at 15°C, and the attention should be paid to drying during sample preparation to avoid the deviation of the experiment caused by hydrolysis of silane coupling agent. The results showed that silanization reaction occured between silica and silane coupling agent in the mixing process. The mixing temperature was usually maintained at 145 to 155°C for 1 min in the mixer, and the silanization reaction rate was the fastest during this time. We took this rubber compound as the research object and studied the friction and wear of the rubber compound on the mixing chamber in the mixing process. The products of the silylation reaction are alcohol and water. This paper studies the corrosion and abrasion of the mixing chamber by water at high temperatures. In the mixing process, abrasive wear was the main wear form, but the corrosion wear caused by high temperature steam still occupied a large proportion.     

转子构型对炭黑分散性及胶料力学性能的影响

主要研究了不同转子构型对炭黑分散性及胶料力学性能的影响。实验表明，在相同混炼条件下，6棱同步转子混炼的胶料获得最好的炭黑分散性，4棱转子的次之，在3组2棱同步转子中，2棱功能转子的混炼效果最好。说明通过改变转子构型，可有效地改善混炼胶中炭黑的分散性，提高胶料的力学性能。     

炭黑对国产钕系稀土顺丁橡胶加工性及性能的影响

研究了炭黑用量及部分掺混白炭黑对钕系稀土顺丁橡胶(NdBR)加工性及性能的影响。结果表明,炭黑填充的NdBR在混炼过程中吃药较快,胶料包辊情况良好,下片光亮平整。填充胶具有较高的链结构规整度,线性好,因此具有较好的拉伸性能、耐磨耗性能和回弹性。随炭黑填充量增加,NdBR混炼胶的门尼黏度升高,正硫化时间和焦烧时间缩短;硫化胶的抗湿滑性能改善,压缩生热升高,回弹性及耐屈挠性能变差。白炭黑对缩短NdBR的硫化时间及提高其力学性能有利,但导致其硬度升高,回弹性与耐磨耗性能下降。     

超耐磨炭黑Vulcan 9HX1在全钢载重子午线轮胎胎面胶中的应用

研究超耐磨炭黑Vulcan 9HX1在全钢载重子午线轮胎胎面胶中的应用。结果表明,胎面胶采用90份天然橡胶、10份顺丁橡胶的生胶体系,选用超耐磨炭黑Vulcan 9HX1替代炭黑N134进行补强,硫化胶老化前后耐磨性能有较大幅度提高,定伸应力和撕裂强度均有所提高,压缩疲劳温升和损耗因子明显降低,成品轮胎室内试验行驶里程长。经过40 d的路试,轮胎平均单位磨耗行驶里程达到26000 km·mm^(-1),轮胎使用寿命延长。     

机械混炼制备碳纳米管/天然橡胶复合材料特性分析

通过机械混炼方法将碳纳米管与天然橡胶复合，与炭黑补强样品相比，碳纳米管在橡胶中的混入速度快，功率消耗低，温升幅度小，混炼胶的硫化焦烧时间略有增加，硫化返原现象减轻，硫化剂用量应适当增加。加入碳纳米管后，橡胶DSC曲线中的结晶熔融峰面积减少，交联反应放热峰变宽。碳纳米管复合材料的回弹、压缩疲劳性能明显优于炭黑补强样品，耐老化性能较好，拉伸、撕裂性能水平有待提高。     

Study of butadiene rubber mastication and mixing with carbon black

A thermomechanical method was applied to study the topological and molecular structure of SKD butadiene rubber masticated and mixed with carbon black. Triblock structure (two amorphous blocks and one a pseudocrystalline structure) of a studied raw rubber and rubber compound networks were found. A ratio of these morphology structures changes during mastication. After mastication, a low‐temperature block has two glass transition temperatures that shows its more complex structure than that in raw rubber. This shows deep transformations taking place during the mastication process. Despite applying high shear forces and heating during mixing with carbon black in a filled BR compound, we present three structures characteristic for BR. However, introduction of carbon black changes the topological structure of polybutadiene. A part of both amorphous blocks grows. A part of a crystalline structure lowers from 88% after 2.5 min of mixing to 54% after 20 min of compounding. The molecular weight distribution of the chains between the junctions of the network and parts of low‐temperature and high‐temperature amorphous blocks, and pseudocrystalline structures in architecture of the rubber network were also calculated. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 71: 729–737, 1999     

HF串联密炼机炼胶工艺技术研究

串联密炼机在能源消耗与胶料性能改善方面有突出优点,它采用啮合型转子结构对胶料进行剪切混炼,混炼效果好,冷却效果良好,适合白炭黑混炼的热履历炼胶控制、转子转数控制等。本文对HF串联密烁机的产量、胶料的性能和动态粘弹性能进行了实验研究,并与普通密炼机进行了对比,结果表明：HF串联密炼机炭黑宏观分散度高,微观分散效果也比一般密炼机好,混炼的胶料扯断强度和扯断伸长率高,胶料在60℃时的动态滞后损失要低于F370混炼的胶料,因此,HF串联密炼机适合绿色环保轮胎高混炼的要求。