丁苯橡胶/轮胎再生橡胶用量比对农业轮胎胎面胶性能的影响

研究丁苯橡胶(SBR)/轮胎再生橡胶(TRR)用量比对农业轮胎胎面胶性能的影响。结果表明:SBR和TRR总用量为80份或SBR用量为50份时,随着TRR用量增大,混炼胶的硫化速率增大,硫化胶的耐臭氧老化性能提高;SBR/TRR用量比为30/50,20/60和10/70时,炭黑在胶料中的分散性较好;SBR/TRR用量比为10/70时,硫化胶的压缩生热较低;SBR/TRR用量比为10/70和50/0时,硫化胶的耐热氧老化性能较好;SBR/TRR用量比为10/70时,胶料的综合性能较好。     

三聚氰胺改性酶解木质素阻燃EPDM的研究

制备三聚氰胺改性酶解木质素,探讨三聚氰胺改性酶解木质素(复配微胶囊红磷)对阻燃三元乙丙橡胶(EPDM)阻燃性能的影响。结果表明,随着三聚氰胺改性酶解木质素用量增大,阻燃EPDM的阻燃性能逐渐提高;当三聚氰胺改性酶解木质素用量为50份和微胶囊红磷用量为12份时,阻燃EPDM的垂直燃烧级别达到FV-0,燃烧面形成阻燃的连续多孔炭层结构。三聚氰胺改性酶解木质素与微胶囊红磷复配作阻燃EPDM的阻燃剂具有较好的经济效益和环保效应。     

新型酶解木质素阻燃剂的合成及其阻燃性能的研究

以酶解木质素、甲醛和间苯二胺为原料,通过正交试验制备酶解木质素-间苯二胺共聚物;以酶解木质素-间苯二胺共聚物为阻燃剂,自制微胶囊红磷为酸源,制备酶解木质素-间苯二胺共聚物/红磷/SBR阻燃复合材料,研究酶解木质素-间苯二胺共聚物用量对复合材料阻燃性能和物理性能的影响.结果表明:酶解木质素-间苯二胺共聚物的最佳工艺条件为木质素用量30 9,甲醛用量0.2 mol,间苯二胺用量0.1 mol,温度80℃,时间 3 min,氢氧化钠质量分数0.03;当酶解木质素-间苯二胺共聚物用量为60份、微胶囊红磷用量为10份,酶解木质素-间苯二胺共聚物/红磷/SBR阻燃复合材料的阻燃级别达FV-0,综合物理性能较好.     

环氧化低分子聚丁二烯改性白炭黑在SBR中的应用

研究环氧化低相对分子质量反式聚丁二烯(ELMTPB)改性白炭黑在SBR中的应用效果。结果表明，环氧度为10．6％的ELMTPB改性白炭黑填充SBR硫化胶的综合性能较好；硅烷偶联剂Si69改性白炭黑对SBR硫化胶性能的改善效果明显优于ELMTPB改性白炭黑，且Si69用量为8份时，硫化胶拉伸强度和撕裂强度较高；在ELMTPB／Si69并用比不超过4／4时，所得SBR硫化胶拉伸强度和拉断伸长率优于Si69改性白炭黑填充SBR硫化胶；当Si69用量为4份且并用12份ELMTPB时，所得SBR硫化胶性能最佳，表现在300％定伸应力提高28％，拉伸强度提高38％，且拉伸强度和拉断伸长率超过8份Si69改性白炭黑填充SBR硫化胶。     

PVC/脲醛改性酶解木质素复合材料的性能

采用PVC树脂和酶解木质素制备得到PVC/酶解木质素复合材料,研究酶解木质素及脲醛改性酶解木质素对复合材料性能的影响.结果表明:随着酶解木质素用量的增大,PVC/酶解木质素复合材料的拉伸强度和冲击强度下降,而经过改性处理后得到的脲醛改性酶解木质素,与PVC之间的相容性得到改善,大大提高了复合材料的力学性能.另外,酶解木质素和脲醛改性酶解木质素加入后均提高了PVC/酶解木质素复合材料的维卡软化点.     

木质素酚醛树脂/丁苯橡胶复合材料的研究

以木质素部分替代苯酚合成木质素酚醛树脂(LPF),制备LPF/丁苯橡胶(SBR)复合材料,并对其形态结构、物理性能和热稳定性进行研究。结果表明:LPF(木质素/苯酚用量比30/70)/SBR复合材料出现相分离,当LPF用量大于25份时,LPF与SBR相互穿插,形成互穿网络结构。加入LPF可以改善复合材料的物理性能,当LPF中木质素/苯酚用量比为30/70、LPF用量为25份时,LPF/SBR复合材料的综合性能最佳。与SBR硫化胶相比,LPF/SBR复合材料质量损失率为5%时的温度降低,质量损失率为50%时的温度升高,质量保持率增大。     

活化胶粉在输送带覆盖胶中的应用

研究活化胶粉用量对丁苯橡胶(SBR)性能的影响以及活化胶粉用量为45份时生胶[天然橡胶(NR)/SBR/顺丁橡胶(BR)]并用比对输送带覆盖胶性能的影响。结果表明,随着活化胶粉用量的增大,SBR胶料的定伸应力增大,拉伸强度降低,拉断伸长率和磨耗量减小,耐热老化性能改善,活化胶粉用量以45份为佳。活化胶粉用量为45份时,对于NR/SBR/BR覆盖胶,当NR用量不变时,随着SBR用量减小和BR用量增大,胶料的Fmax增大,t10缩短,硫化速率加快;当SBR用量不变时,随着NR用量减小和BR用量增大,胶料的FL和Fmax降低,t10变化不大,t90缩短,硫化效率提高。在输送带覆盖胶中加入45份活化胶粉,胶料的工艺性能好,生产成本大幅降低。     

改性淀粉对炭黑填充丁苯橡胶/顺丁橡胶并用胶性能的影响

用改性淀粉替代部分炭黑填充丁苯橡胶(SBR)/顺丁橡胶(BR)并用胶,考察了改性淀粉用量及偶联剂种类对混炼胶硫化特性及硫化胶物理机械性能和动态力学性能的影响.结果表明,用改性淀粉替代部分炭黑可对SBR/BR混炼胶的硫化产生明显的延迟作用,但改性淀粉用量的变化对焦烧时间与正硫化时间影响不大;添加偶联剂KH-570或NDZ-201延迟了混炼胶的硫化过程,KH-550能大幅度地促进硫化作用,Si-69对于体系的硫化性能略有影响;随着改性淀粉用量的增加,SBR/BR硫化胶的拉伸性能、耐磨耗性均有所降低,但弹性、动态生热和滞后性能得到了明显改善,改性淀粉最佳用量为5～8份;各种偶联剂均可提高SBR/BR硫化胶的拉伸性能,硅烷偶联剂Si-69和KH-570对弹性和动态生热也略有改善,添加偶联剂KH-550改善了SBR/BR硫化胶的抗湿滑性能,但滞后性能变差,添加偶联剂KH-570或Si-69对SBR/BR硫化胶动态力学性能的影响较小,综合考虑,以添加偶联剂KH-570较好.     

氯丁橡胶/丁苯橡胶共混物的研究

探讨了氯丁橡胶（CR）/丁苯橡胶（SBR）共混胶料的硫化特性,共混硫化胶的力学性能、压缩弹性模量和动态力学性能.研究结果表明：当共混胶料中SBR用量在5～25份范围内时,随着SBR用量增加,共混胶的MH降低,t90时间延长,ML和t10时间变化不大;拉抻强度、300%定伸应力、硬度均随SBR用量的增加而降低;共混硫化胶的压缩弹性模量随SBR用量的增加而降低,当SBR用量为5份后,-40℃时的压缩弹性模量约为纯CR硫化胶的一半;在-20℃以上时,共混硫化胶压缩弹性模量随温度变化曲线较为平稳,斜率较小;DMA结果显示随SBR用量增大,tanδ降低,E′增大,Tg变化不大.     

酶解木质素/氢氧化镁复合材料的制备及阻燃性能研究简

用反向沉淀法制备酶解木质素/氢氧化镁复合材料,并研究其对丁苯橡胶(SBR)胶料的阻燃效应。结果表明:复合材料中酶解木质素包覆氧化镁,酶解木质素/氢氧化镁并用比为1∶1时,复合材料的阻燃效应较好,800℃时的质量保持率高;100份复合材料(酶解木质素/氢氧化镁并用比1∶1)的与10份微胶囊红磷配合的SBR胶料燃烧成炭性好,阻燃级别可达到FV-0,阻燃性能和物理性能好。     

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。     

Preparation of lignin-based filling antioxidant and its application in styrene-butadiene rubber

A novel filling antioxidant (Lig-g-RT) to improve the mechanical properties and antiaging performance of styrene-butadiene rubber (SBR) composites was prepared by grafting antioxidant intermediate p-aminodiphenylamine (RT) on the surface of lignin via the linkage of silane coupling agent. Fourier transform infrared (FTIR) and thermogravimetric analysis (TGA) measurements confirmed that RT was successfully grafted on the surface of lignin to produce the functionalized Lig-g-RT which shows a better thermal stability than lignin. Compared with SBR/lignin composite, the SBR/Lig-g-RT composite using latex co-precipitation method exhibits a much better filler dispersion, which contributes to the maintain of the physical mechanical properties of SBR vulcanizates. Moreover, the SBR/Lig-g-RT vulcanizate exhibits less chemical crosslink concentration and higher entanglement density than SBR/lignin vulcanizate according to the Mooney–Rivlin model analysis. In addition, the stabilizing effect of lignin/Lig-g-RT on the carbon-black filled SBR vulcanizates is comparable with that of commercial antioxidant N-1,3-dimethylbutyl-N′-phenyl-p-phenylenediamine (4020), especially the SBR vulcanizate filled with 10 phr Lig-g-RT obtains the optimum thermo-oxidative aging properties. This functionalized Lig-g-RT not only provides an intramolecular synergistic antiaging effect for SBR vulcanizates and an improvement of filler dispersion, but greatly extends the comprehensive utilization of industrial lignin.     

Effect of pulverized coal/carbon black hybrid fillers on mechanical properties and thermal stability of styrene butadiene rubber composites

Pulverized coal (coal) possesses a layered structure similar to graphite and is a potential reinforcing filler. In this paper, ball milling is used to reduce the particle diameter of coal. The coal is modified with KH-560 to obtain K-COAL and prepared K-COAL/styrene-butadiene rubber (SBR) composites. In addition, carbon black (CB) is modified to obtain CB-Si69, K-COAL and CB-Si69 are added to SBR in different ratios to prepare COAL/CB/SBR composites. The results show that the addition of K-COAL can improve the vulcanization performance, thermal stability, and mechanical properties of SBR composites, but the reinforcing effect is weak. In the COAL/CB/SBR composites, the vulcanization and mechanical properties of the composites gradually increase with the increase of CB, while those of the thermal stability decrease. The tensile strength of the 10 phr COAL/30 phr CB/SBR composite is 24.1 MPa, which is elevated by 1105% and 205% compared with the pure SBR and 40 phr K-COAL/SBR composites, respectively. The composites maintain high elasticity while the tensile strengths are greatly improved, and the mechanical properties are significantly enhanced. In conclusion, this paper provides a reference for the clean utilization of coal and shows new possibilities for finding new fillers to replace CB.     

偶联剂对白炭黑／SBR复合材料力学性能的影响

研究了4种偶联剂KH-550、KH-792、WD-60和HG-305对白炭黑／SBR复合材料力学性能和热空气老化性能的影响。研究结果表明：当KH-550用量为4．0份时,复合材料的综合力学性能最好,与未改的白炭黑／SBR复合材料相比,其拉伸强度和撕裂强度分别提高了77％和24％;复合材料的老化实验结果表明,经偶联剂改性的复合材料的耐热老化性能有所下降,其中HG-305改性的复合材料抗老化性较好。     

改性纳米氮化硅/NR/SBR复合材料的制备与性能研究

采用甲基丙烯酸甲酯(MMA)-丙烯酸丁酯(BA)-乙烯基三乙氧基硅烷(VTES)三元共聚物对纳米氮化硅进行表面改性,制备改性纳米氮化硅/NR/SBR复合材料,并对复合材料的性能进行研究.结果表明,采用MMA-BA-VTES三元共聚物改性后,纳米氮化硅的平均粒径明显减小,分散性改善;当改性纳米氮化硅用量为2.5份时,复合材料的综合物理性能最优.     

固相法改性纳米碳酸钙对丁苯橡胶的补强作用

研究了用带有酚醛结构的反应性有机改性剂对纳米碳酸钙进行固相改性得到的M—CaCO3填充丁苯橡胶（SBR）所得复合材料的力学性能、热稳定性能、微观形态和老化性能．并与丁苯橡胶／硬脂酸包覆型纳米碳酸钙（CCR）复合材料的性能进行比较。结果表明，M—CaCO3对SBR力学性能和热稳定性能的提高比CCR更显著，且M—CaCO3能改善SBR的老化性能。电镜观察表明，M—CaCO3在SBR中的分散性优于CCR．且界面结合形态得到了改善。M—CaCO3添加量为20～40份时。复合材料综合力学性能最好。     

Wood flour as a secondary filler in carbon black filled of styrene butadiene/chlorosulphonated polyethylene rubber blend

A study is reported which aims to identify the optimum contents of wood flour (WF) to be introduced into styrene butadiene/chlorosulphonated polyethylene (SBR/CSM) rubber blend compounded with carbon black. A range of composite properties are considered including cure characteristics and mechanical properties, as well as the adhesion strength (rubber‐to‐metal bonding) behavior. Processing characteristic such as maximum torque increases with increasing of the concentration of WF up to 40 phr in SBR/CSM blend, whereas the scorch time and optimum cure time decreases. Results indicated that the tensile strength and tensile modulus, as well as shore hardness of the SBR/CSM composite in which SBR is predominant, increase in a compliance with the increase of WF. Adhesion strength value on peel between metal and WF filled SBR/CSM rubber blend increases when the filling level increases and the maximum value were observed at 40 phr of WF. The enhancement in mechanical properties was supported by data of crosslink density in these samples obtained from swelling measurement. Addition of WF was recommended as an economical and ecological benefit to industries as the properties of the rubber/carbon black composites remained unchanged with increasing WF content. POLYM. COMPOS., 2008. © 2008 Society of Plastics Engineers.     

纳米二氧化硅与SBR复合改性乳化沥青的性能研究

用差示扫描量热法（DSC）对纳米二氧化硅与SBR复合改性乳化沥青蒸发残留物的热性能进行研究。结果表明，加入SBR乳液、纳米二氧化硅后样品的温度稳定性和耐高温性能均得到提高；其中SBR（质量分数0．03）加纳米二氧化硅（质量分数0．0005）复合改性效果最佳。纳米二氧化硅与SBR形成网状结构以及SBR在体系中吸附油分后的溶胀作用是沥青性能改善的主要原因。     

木质素用量对乳液共沉天然橡胶性能的影响

采用共沉方法制备天然橡胶/木质素复合材料,研究了复合材料和炭黑胶料的性能以及木质素用量对天然橡胶性能的影响。结果表明,加有木质素的胶料,随着木质素用量的增加,复合材料的门尼粘度逐渐上升,炭黑胶料的最低转矩(ML)增大,最高转矩(MH)下降,正硫化时间(tc90)延长,焦烧时间(ts1)缩短,炭黑分散性变差,胶料的加工安全性、耐磨性及耐老化性变差,硫化胶的定伸应力降低。当木质素用量在20份以内时,硫化胶的拉伸强度和撕裂强度提高。