CM/NBR共混胶共混工艺的研究

研究了不同加料顺序及不同工艺参数对CM/NBR共混胶性能的影响。结果表明,先将炭黑、CM和小料制成母炼胶,再将母炼胶与NBR共混可提高炭黑和小料的分散性,制得的共混胶性能较好;采用密炼温度为60℃且转子转速为80r/min的混炼工艺可提高CM/NBR共混胶的共混效果。     

炭黑分散性对轮胎胎面胶性能的影响

研究炭黑分散性对全钢载重子午线轮胎胎面胶性能的影响。结果表明:提高密炼排胶温度和密炼能耗可以提高炭黑的分散性;炭黑分散性提高,有利于改善胶料的加工工艺性能和加工安全性能,提高物理性能和耐磨性能,降低生热。     

炭黑/多壁碳纳米管/天然橡胶复合材料密炼工艺参数的优化

采用正交试验方法对炭黑/多壁碳纳米管(MWCNTs)/天然橡胶(NR)复合材料的密炼工艺参数进行优化。结果表明:密炼起始温度、转子转速和密炼时间对复合材料的性能影响较大;综合考虑复合材料的硫化特性、导热性能和物理性能,其优化密炼工艺参数为密炼起始温度70℃,转子转速60 r·min~(-1),密炼时间10 min。     

混炼工艺对炭黑/CR/BR复合材料性 能的影响

工作以CR/BR并用胶为基体材料、炭黑为补强填料制备炭黑/CR/BR复合材料,探究炭黑的添加顺序与薄通工艺对炭黑在CR/BR并用胶中的分散性及其硫化胶性能的影响。结果表明：在不同混炼工艺制备炭黑/CR/BR并用胶中,采用先将炭黑混入BR相中再与CR共混的工艺很好的提高了炭黑的分散性,炭黑/CR/BR复合材料的硫化特性和物理性能随炭黑分散性变好而得到提高;薄通5次时各种配合剂在并用胶中分散性良好。     

导电炭黑对聚氯乙烯改性丁腈橡胶(PVC/NBR)性能的影响

从炭黑种类、炭黑用量及混炼工艺方面对PVC/NBR性能的影响进行了研究。结果表明,加入导电炭黑能够有效降低胶料电阻值。导电炭黑用量20份时,采用两段密炼混炼工艺,制备的PVC/NBR的电阻较低,物理机械性能稳定且易于实现加工。     

混炼工艺对混炼胶中炭黑分散性的影响

试验研究了混炼工艺的改进对提高胶料中炭黑分散性的作用。结果表明,通过调整母炼胶混炼加料温度和顺序、补充终炼胶加工工序、确定合理的混炼容量和停放时间,可改善混炼胶中炭黑的分散性,确保混炼胶半成品的质量。     

原液着色黑色聚酯中炭黑的分散与控制

在三釜流程聚酯装置上,采用原液着色方式生产黑色聚酯,对炭黑分散剂及其浆料的稳定性,以及炭黑浆料的注入方式等进行了探讨。结果表明:以自制的TA202为分散剂制得质量分数为20%的炭黑/乙二醇浆料,采用预缩聚前注射的方式,调整熔体过滤与混合条件,能制得炭黑分散性良好易于纺丝的黑色聚酯熔体。     

普通炭黑改性制备色素炭黑的酸化研究

通过改变硫酸浓度、反应时间对炭黑N330进行改性处理,并将改性炭黑与普通色素炭黑的主要指标进行比较。结果表明,经浓度为10 mol/L的硫酸8 h酸化制备得到的改性炭黑分散性最好,制得的炭黑粒径更小,表面含氧基团量增加,基本达到普通色素炭黑的要求。     

混炼工艺对炭黑/氯丁橡胶/顺丁橡胶复合材料性能的影响

以氯丁橡胶(CR)/顺丁橡胶(BR)并用胶为基体材料、炭黑为补强填料制备炭黑/CR/BR复合材料,探讨混炼工艺对复合材料性能的影响。结果表明:薄通5次时配合剂在CR/BR并用胶中分散良好;采用先将炭黑混入BR相中再与CR共混的混炼工艺可以提高炭黑的分散性,且炭黑/CR/BR复合材料的硫化特性和物理性能较好。     

国外炭黑文摘

2005001炭黑生产与应用本发明炭黑的CTAB比表面积为10—35m^2／g、DBP吸收值为40-80ml/100g、△D50至少为340nm。将液态炭黑原料和气态炭黑原料喷人炉法炭黑反应炉可制得这种炭黑。同其它炭黑相比，本发明炭黑的优点在于具有优异的分散性，在胶料中应用既方便又实惠，尤其适用于异型挤出制品。     

多元醇复配制备耐黄变聚氨酯丙烯酸酯复合乳液

以异佛尔酮二异氰酸酯（IPDI）、混合多元醇、甲基丙烯酸甲酯（MMA）为主要原料合成了脂肪族聚氨酯丙烯酸酯复合乳液。混合多元醇由聚碳酸酯二醇（PCDL）、聚四亚甲基醚二醇（PTMEG）、聚醚二醇（N220）以不同比例复配而成。重点探讨了PCDL与N220、PTMEG与N220及PTMEG与PCDL复配比例对乳液、胶膜性能的影响。实验发现,当PTMEG与N220以相同质量比复配且控制硬段含量在60％时,得到贮存稳定性好,胶膜硬度高、耐水、耐溶剂性能好、耐黄变性优异的PUA复合乳液。     

多孔渗水混凝土材料的制备及性能研究

针对传统路面铺装材料在路面渗透性差,导致城市路面经常出现内涝的问题,提出和制备一种多孔渗水的混凝土路面铺装材料。对此,文章以5~10 mm的单粒径级配粗集料、水泥、粉煤灰、硅灰、聚丙烯纤维等作为原材料,结合一定的配合比,利用一次搅拌法对材料进行搅拌,从而得到不同配合比和不同掺入方法下的混凝土试件。最后,以抗折强度、渗透系数等作为评价指标,对上述制备混凝土试件进行评价,验证了多孔渗水混凝土材料的性能。     

一次法混炼工艺对胎面磨耗性能的影响

胎面的耐磨性是评价成品轮胎性能优劣的一项重要指标,它取决于很多因素,但其中最关键的因素还是胎面的配方体系和胶料的混炼工艺。胶料的耐磨耗性能有磨损磨耗、疲劳磨耗、巻曲磨耗三种表现形式,本文主要从丰源轮胎推行的“一次法混炼工艺”针对炼胶工艺的提升与传统工艺进行对比,进而验证“一次法混炼工艺”所生产的胎面胶料对于胎面耐磨性的提升。     

耐黄变水性聚氨酯分散液的制备和性能

以聚氧四亚甲基二醇(PTMEG)和聚醚二元醇(N220)为复配的多元醇,三羟甲基丙烷(TMP)为交联剂,与异佛尔酮二异氰酸酯(IPDI)反应制备了脂肪族聚氨酯分散液(WPUD)。探讨了PTMEG与N220的配比、TMP的用量对WPUD性能的影响。结果表明,当PTMEG与N220质量比为1∶1,TMP的添加质量分数为1.0%时,WPUD的综合性能较好,涂膜具有较好的耐黄变性能,可用于水性木器涂料。     

炭黑预分散混炼工艺在全钢载重子午线轮胎胎面胶生产中的应用

以预分散炭黑/天然橡胶母胶和一段混炼胶的排胶温度、填充因数和转子转速为因子,采用正交试验设计方法研究炭黑预分散混炼工艺在全钢载重子午线轮胎胎面胶生产中的应用。结果表明,与常规混炼工艺相比,采用炭黑预分散混炼工艺胶料的炭黑分散性提高,物理性能和耐老化性能改善,成品轮胎的耐久性能和高速性能提高,退赔率下降。     

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。     

纳米颗粒对粉煤灰水泥基材料干缩变形的影响及机理

为探讨纳米颗粒对掺粉煤灰的水泥基材料干缩变形的影响,选取了纳米SiO2和纳米SiC两种纳米颗粒,分别制备了纳米改性粉煤灰水泥砂浆和混凝土试件,通过试验研究了纳米颗粒掺量对不同龄期粉煤灰水泥砂浆和混凝土干缩性能的影响,并分析了其作用机理.结果表明,掺纳米颗粒的水泥砂浆干缩率明显增大,掺量为2％的纳米SiO2水泥砂浆和纳米SiC水泥砂浆的28 d干缩率较普通水泥砂浆分别增大了90％和120％;掺量为2％的纳米SiO2混凝土和纳米SiC混凝土28 d干缩率较基准混凝土增大了124.8％和85.8％;纳米颗粒对粉煤灰水泥砂浆和粉煤灰混凝土干缩性能的影响很明显,而混掺与单掺纳米颗粒对混凝土的干缩率影响不大.分析认为,纳米颗粒比表面积大,吸附水分增多,造成内部自由水被大量消耗,同时由于纳米颗粒填充了混凝土内部结构中的微小孔隙,使得外部水分难以进入内部而被蒸发,造成内外变形不一致,最终增大了混凝土的干缩率.     

Reactive processing and evaluation of butadiene–styrene copolymer/polyaniline conductive blends

Blending is an important way to obtain materials based on intrinsically conductive polymers and conventional plastics and rubber materials. Much research has been carried out to determine the best performance of materials be used for electrostatic dissipation and electromagnetic interference shielding. Mechanical mixing, codissolution, and in situ polymerization have been used to prepare these materials. The method used depends on the host polymer and its thermal stability and acid attack resistance. Homogeneity and miscibility are properties that should be controlled during blend preparation. In this study, we prepared a conductive thermoplastic elastomer material based on butadiene–styrene copolymer (SBR) and polyaniline (PANI) doped with dodecylbenzene sulfonic acid (DBSA) and poly(styrene sulfonic acid) (PSS). PSS also acted as compatibilizer between PANI and SBR. PANI was doped by reactive processing with DBSA and PSS to produce the conductive complex PANI–DBSA–PSS. This complex was mixed with 90, 70, and 50% (w/w) SBR in a counterrotatory internal mixer. Conductivity tests, swelling studies, thermal analysis, and mechanical property and reflectivity testing were done, and the results show a strong dependence on PANI concentration and the ratio between PANI–DBSA and PSS. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 681–685, 2006     

A morphological study on the migration and selective localization of graphene in the PLA/PMMA blends

Nano‐filled polymer blends offer the opportunity to obtain materials with fine‐tuned properties. In this work, the dispersion and localization behavior of graphene nanoplate (GNP) and graphene oxide (GO) in solution mixed blends of polylactic acid (PLA) and polymethyl methacrylate (PMMA) were investigated. The blends were prepared by using different mixing sequences to investigate the effect of kinetics parameters and surface chemistry of filler as well as thermodynamics affinity on the localization of fillers. Field Emission Scanning Electron Microscopy (FESEM) and Rheometric Mechanical Spectroscopy (RMS) were employed. In addition, graphene materials were compared by Fourier transform infrared and Raman spectroscopy as well as elemental analysis characterization. Results showed that depending on the mixing sequence, the GNPs were localized in the both phases and interface through migration to reach thermodynamics equilibrium. However, GO localization was significantly affected by the mixing sequence due to better interaction with the polymer phases. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 43799.     

Internal mixing: A practical investigation of the influence of intermeshing rotor configuration and operating variables on mixing characteristics and flow dynamics

This paper deals with the measurement and interpretation of pressures and temperatures produced by the mixing of a rubber compound in the chamber of an internal mixer equipped with interlocking rotors. Pressure transducers and infrared/fiber optic temperature sensors were sited flush with the inner surface of the mixing chamber of a Francis Shaw KO Intermix of 2 L chamber volume. The variation of pressure with transducer position In the chamber wall and with rotor position was measured for selected fill factors and rotor speeds at “equilibrium” conditions (quasi-static power requirement for the mixer) and at intervals during a complete mixing cycle. Two rotor designs were studied. Interpretation of the results was carried out with reference to biconical rotor rheometer measurements on the mixed rubber compounds and by reference to four regimes of viscoelastic behavior identified for two-roll mill mixing. A basic flow analysis was carried out by use of the lubrication approximation in conjunction with an isothermal power-law model.