白炭黑分散性的有效评价研究

对4种白炭黑及其胶料性能进行分析,确定可评价白炭黑在胶料中分散性的性能项目。结果表明:用白炭黑的常规理化性能及硫化胶的基本物理性能不能有效评价白炭黑的分散性,依据白炭黑激光粒径分布、混炼胶Payne效应、混炼胶门尼粘度及硫化胶耐屈挠性能可有效评价白炭黑的分散性。     

湿法改性沉淀白炭黑在半钢子午胎胎面胶中的应用

为改善白炭黑填料在混炼胶中的分散性,本工作研究了硼烷偶联剂湿法改性沉淀白炭黑及其在半钢子午胎胎面胶中的应用效果。实验结果表明,应用硼烷偶联剂湿法改性沉淀白炭黑后,白炭黑的亚微观结构有所改变,混炼胶的加工扭矩、能耗降低,混炼工艺性能改善;混炼胶的PAYNE效应降低,填料分散性改善;t_(10)延长,t_(90)缩短,加工安全性能及生产效率提高;硫化胶的强伸性能、撕裂性能、耐磨耗性能、耐屈挠性能指标均有所提高;硫化胶的压缩生热降低,低滞后性明显改善。     

白炭黑补强天然橡胶/高反式-1，4-丁二烯-异戊二烯共聚橡胶并用胶性能的研究

以天然橡胶(NR)/高反式-1,4-丁二烯-异戊二烯共聚橡胶(TBIR)并用胶为对比,研究白炭黑补强NR/TBIR并用胶的性能。结果表明:NR/TBIR混炼胶和白炭黑补强NR/TBIR混炼胶的强度分别较NR混炼胶和白炭黑补强NR混炼胶提高;随着TBIR用量增大,NR/TBIR硫化胶和白炭黑补强NR/TBIR硫化胶的压缩永久变形和DIN磨耗量分别较NR硫化胶和白炭黑补强NR硫化胶减小,耐屈挠疲劳性能和耐伸张疲劳性能大幅提高,静摩擦因数和动摩擦因数增大;白炭黑补强NR/TBIR硫化胶较白炭黑补强NR硫化胶的白炭黑聚集体平均粒径减小,白炭黑在橡胶基体中的分散性改善。     

白炭黑/硅烷体系对丁腈橡胶性能的影响

研究了白炭黑与Si-69体系对丁腈橡胶中白炭黑分散性、混炼胶的加工性能及硫化胶使用性能的影响。结果表明,丁腈橡胶中丙烯腈含量越高,其与白炭黑的相互作用越强,白炭黑在丁腈橡胶中的分散性越好。配合体系中加入偶联剂Si-69能提高白炭黑与丁腈橡胶间的相互作用,提高白炭黑在橡胶中的分散性。丁腈橡胶中加入白炭黑后,只要对硫化体系作适当调整,便不会延迟丁腈橡胶的硫化,但达到正硫化的时间会有所延长。白炭黑能够有效地改善硫化胶的拉伸强度、撕裂强度和定伸应力,同时有利于丁腈橡胶耐油性的提高。     

高比表面积白炭黑在轿车子午线轮胎胎面胶中的应用

研究高比表面积白炭黑对轿车子午线轮胎胎面胶性能的影响。结果表明,与低比表面积白炭黑胶料相比,高比表面积白炭黑胶料填料之间的作用较强,填料分散性较差,混炼胶门尼粘度较高、硫化速率较慢,硫化胶强伸性能较好。适当减小高比表面积白炭黑用量,同时适当增大偶联剂和促进剂用量,可以提高胶料的加工性能,并更好地平衡轮胎的抗湿滑性能和滚动阻力。     

ZDMA/白炭黑填充HNBR的结构与性能

以甲基丙烯酸锌(ZDMA)/白炭黑填充氢化丁腈橡胶(HNBR),研究ZDMA/白炭黑并用比、硫化剂DCP用量及硫化时间对HNBR硫化胶结构和性能的影响。结果表明,在填料总量不变的前提下,随着白炭黑用量的增大,ZDMA/白炭黑填充HNBR硫化胶拉伸强度和压缩永久变形先减小后增大,填料分散性下降;随着硫化剂DCP用量的增大,ZDMA/白炭黑填充HNBR硫化胶物理性能和动态性能提高,填料分散性变好。当ZDMA/白炭黑并用比为10/30、硫化剂DCP用量为5～6份、一段硫化条件为160℃×45min、二段硫化条件为150℃×(9～12)h时,ZDMA/白炭黑填充HNBR硫化胶综合性能较好。     

白炭黑/天然橡胶湿法混炼共沉胶的性能研究

研究白炭黑/天然橡胶湿法混炼共沉胶的加工性能、物理性能和动态性能,并与传统干法混炼胶进行对比。结果表明:在湿法混炼共沉胶中增大白炭黑用量,胶料的焦烧时间和正硫化时间逐渐延长,硫化胶的拉伸强度逐渐增大,损耗因子略有减小,玻璃化温度升高;与干法混炼胶相比,湿法混炼共沉胶的正硫化时间延长,加工能耗大,生热低,硫化胶的物理性能和动态性能较好。扫描电镜分析显示,白炭黑在湿法混炼共沉胶中的分散性更好。     

白炭黑/NR湿法混炼共沉胶加工和动态性能研究

本文通过扫描电镜观察了白炭黑在湿法和干法混炼硫化胶中的分散,显示白炭黑在湿法混炼胶中分散性更好。研究了白炭黑的用量对白炭黑/NR湿法混炼共沉胶的加工和动态性能影响,与传统干法混炼胶作对比,结果表明,湿法混炼共沉胶中增加白炭黑用量,会延长硫化时间,粘性转矩增大,拉伸性能提高,玻璃化温度升高;湿法炼胶比干法炼胶的焦烧时间长,混炼胶加工中能耗大、自身生热小,硫化胶有较好的物理机械性能和动态性能。     

偶联剂改性生化木质素在天然橡胶中的应用研究

采用乳液共沉法制备天然橡胶/生化木质素/白炭黑(NR/BCL/白炭黑)复合材料,研究了硅烷偶联剂四硫化双(三乙氧基丙基)硅烷(Si-69)用量对复合材料门尼黏度、硫化特性、物理机械性能、填料分散性及动态热机械性能的影响。结果表明,随着Si-69用量的增加,混炼胶的焦烧时间缩短,硫化时间延长,硫化程度增加;当Si-69用量不超过4份时,混炼胶的填料分散性变化不大;硫化胶的拉伸强度、100%与300%定伸应力先增加后下降,断裂伸长率先下降后增加,撕裂强度、硬度均有所增加,当Si-69用量为4份时,硫化胶的综合力学性能最佳;硫化胶的损耗因子峰值增大,当Si-69用量为4份时,滚动阻力最低,但抗湿滑性相对较差。     

白炭黑水分散体质量分数对天然橡胶/白炭黑湿法混炼胶料性能的影响

采用湿法混炼工艺,将4种不同质量分数的白炭黑水分散体与天然乳胶混合制备出天然橡胶/白炭黑胶料。结果表明,当白炭黑水分散体质量分数为0. 25时,白炭黑在橡胶中的分散性较好,混炼胶门尼粘度较低,硫化性能较好,硫化胶的定伸应力、拉伸强度、撕裂强度较大,磨损率较小,抗湿滑性能较好,滚动阻力较低。     

基于离子超分子网络实现自修复天然橡胶的制备

将甲基丙烯酸锌（ZDMA）或聚（甲基丙烯酸锌）低聚物（PM）引入到天然橡胶中,同时并用炭黑/白炭黑与天然橡胶共混,制备一种具有自修复性能的耐屈挠疲劳橡胶。研究结果表明,与PM相比,ZDMA可形成以离子交联为主的可逆超分子网络,赋予了硫化胶更好的自修复功能,当其用量为40份（质量）时硫化胶的自修复效率最高,接近100%。不饱和羧酸盐（ZDMA或PM）与传统填料（炭黑和白炭黑）并用时,PM仅在前期可有效抑制裂纹的扩展,ZDMA可明显提高材料的耐屈挠疲劳性能,当m（ZDMA）/m（炭黑）为20/40时硫化胶的耐屈挠疲劳性能最好。     

炭黑/白炭黑并用对溶聚丁苯橡胶性能的影响

研究了白炭黑/炭黑并用体系对溶聚丁苯橡胶（SSBR）加工性能、力学性能和动态力学性能的影响,并对填料分散性进行了研究。结果表明,白炭黑和炭黑并用时可提高补强效果,白炭黑/炭黑并用比为30/20时的硫化胶综合力学性能最佳;TEM观察结果表明,填料与SSBR基体的临界界面模糊,填料分散较为均匀,填料网络化程度降低。     

Guayule natural rubber composites: impact of fillers on their cure characteristics,dynamic and mechanical behavior

Guayule natural rubber (GNR) is an alternative resource of Hevea natural rubber (HNR) with 99.9% cis content in its 1,4-polyisoprene chemical backbone. In this study, compounds were formulated independently with four different reinforcing fillers such as carbon black (HAF), precipitated silica (VN3), fume silica (FUM) and nanofly ash (NFA) for the advancement of GNR based products. The cure characteristic, dynamic-mechanical performance and mechanical properties of GNR composite were studied with the reinforcing effect of different fillers on GNR. The cure characteristic results demonstrated that HAF and FUM silica filled compounds had more processing safety than VN3 and NFA filled compounds. Viscoelastic parameters of the vulcanizates were studied by dynamic mechanical analysis to estimate the glass transition characteristics and dynamic behavior. The higher storage modulus of FUM silica vulcanizate was an indication of superior filler reinforcing nature and improved rolling resistance than other filled systems. Additionally, HRTEM analysis also proved the better filler dispersion ability of FUM silica in GNR matrix. The mechanical properties were studied with a variation of each filler loading of 8, 16, and 32 phr in GNR vulcanizates. The tensile strength of each filled system increased with an increase of filler content from 8 to 32 phr. In comparison, FUM silica GNR vulcanizates exhibited better mechanical properties, therefore, it was considered as a better structure-performance composite than those of HAF, VN3 and NFA filled composites.

     

SSBR和ESBR胎面胶性能研究

研究炭黑或白炭黑补强溶聚丁苯橡胶(SSBR)和乳聚丁苯橡胶(ESBR)胎面胶的性能.结果表明,SSBR与白炭黑的界面作用强于ESBR;当采用白炭黑补强时,SSBR硫化胶的物理性能优于ESBR,而采用炭黑补强时,SSBR硫化胶的物理性能无明显优势;与炭黑补强SBR硫化胶相比,白炭黑补强SBR硫化胶的抗湿滑性能较好,滚动阻力较低,但耐磨性能较差,其中白炭黑补强SSBR硫化胶的抗湿滑性能最突出.     

Fatigue resistance of silica‐filled natural rubber vulcanizates: comparative study of the effect of phosphorylated cardanol prepolymer and a silane coupling agent

The fatigue resistance of silica‐filled natural rubber (NR) mixes modified with phosphorylated cardanol prepolymer (PCP) was studied in comparison with similar compositions without PCP and with those containing the same dosage of a silane coupling agent (Si‐69). Considerable improvement in the fatigue resistance was observed for the PCP‐modified NR vulcanizate containing 20 phr of silica compared with the unmodified and Si‐69 modified vulcanizates. In addition, the tear strength of the PCP‐modified NR vulcanizate was higher than that of the others. Atomic force microscopy and the scanning electron microscopy of the vulcanizates showed better dispersion of silica particles in the NR matrix in the presence of PCP than in the unmodified and Si‐69‐modified NR vulcanizates. It is assumed that, at a dosage of 5 phr, PCP functions as a coupling agent between NR and the silica particles thereby improving the filler dispersion and consequently the mechanical properties of the vulcanizate. Copyright © 2005 Society of Chemical Industry     

环氧化天然橡胶与白炭黑及Si 69之间的反应及其对白炭黑填充溶聚丁苯橡胶性能的影响

研究了环氧化天然橡胶(ENR)与白炭黑及改性剂Si 69之间的反应及其对白炭黑/溶聚丁苯橡胶复合材料中白炭黑的分散状况以及复合材料力学性能的影响。结果表明,ENR中的环氧基团开环与白炭黑发生反应,但不能开环与Si 69发生反应。由于ENR与白炭黑的反应速率较慢,导致ENR改性白炭黑在溶聚丁苯橡胶混炼胶与硫化胶中的分散状况有所不同。但是将ENR和Si 69同时加入到白炭黑/溶聚丁苯橡胶复合材料中后,与只用Si 69改性白炭黑填充的溶聚丁苯橡胶相比,硫化胶的拉伸强度基本不变,定伸应力、硬度和撕裂强度增大,扯断伸长率和拉伸永久变形减小,这是因为加入ENR和Si 69后即存在白炭黑与ENR及白炭黑与Si 69两种反应,并且ENR中的环氧基团可以活化其相邻的双键,加速硫化,从而导致硫化胶交联密度增大的缘故。     

投料顺序对胶料物性和填料分散度的影响

本文研究了胶料混炼过程中填料的投料顺序对胶料物理性能和填料分散性的影响。结果表明：先加防老剂等有机助剂,后加氧化锌,硫化胶的物理性能和填料的分散性有所提高;且防老剂类有机物越早加入,硫化胶的耐老化性能越好;氧化锌与炭黑一同加入,填料的分散性变差。     

Improvement of properties of silica‐filled natural rubber compounds using polychloroprene

Because silica has strong filler–filler interactions, a silica‐filled rubber compound is characterized by a poor dispersion of the filler. Properties of silica‐filled natural rubber (NR) compounds were improved using polychloroprene (chloroprene rubber [CR]). The bound rubber content of the compound increases and the filler dispersion is also improved by adding CR to the compound. Physical properties such as modulus, tensile strength, abrasion, and crack resistance are improved by adding CR. Elongation at break of the vulcanizates containing CR is longer than that of the vulcanizate without CR, although crosslink density of the former is higher than that of the latter. The improved physical properties are attributed to the good dispersion of silica by adding CR. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 83: 2609–2616, 2002     

碱法制备蔗渣纳米纤维素/丁苯橡胶复合材料性能

针对目前硫酸法制备纳米纤维素高污染、高危险、高处理成本的缺点,采用环境友好、低能耗、低成本的碱法从蔗渣中制备纳米纤维素（2-BNC）,补强丁苯橡胶（SBR）,并与硫酸法制备的纳米纤维素（S-BNC）以及白炭黑（silica）补强SBR的性能进行对比,探究2-BNC的加入对复合材料性能的影响。结果表明,2-BNC在基体中的分散性优于silica,与SBR基体有良好的界面结合,在同等填料份数下,SBR/2-BNC硫化胶的储能模量高于SBR/silica硫化胶,损耗因子下降,耐磨耗性能更加突出,且力学性能更佳;2-BNC和S-BNC对SBR的整体补强效果相当。