不同共混比Ln—BR／NR的性能

研究了稀土顺丁橡胶（Ｌｎ－ＢＲ）与天然橡胶（ＮＲ）以不同比例共混后生胶、混炼胶和硫化胶的性能，并与相同条件下的镍系顺丁橡胶（Ｎｉ－ＢＲ）／ＮＲ共混胶的性能进行了对比，结果表明，共混胶随Ｌｎ－ＢＲ用量的增大，ＭＬ＾１００℃１＋４降低，工艺行为良好，硫化胶力学性能、磨耗、湿滑指数和生热值下降，并且Ｌｎ－ＢＲ／ＮＲ硫化胶的抗湿滑性和动态疲劳性均优于Ｎｉ－ＢＲ／ＮＲ硫化胶。     

锡偶联型溶聚丁苯橡胶/天然橡胶共混物的性能

研究了不同共混比的锡偶联型溶聚丁苯橡胶／天然橡胶（ＳＳＢＲ／ＮＲ）共混物的生胶及硫化胶的性能及断裂形态。实验表明,ＳＳＢＲ／ＮＲ共混物具有单一的玻璃化转变温度、共混体系为相容体系。ＳＳＢＲ与ＮＲ共混后,改善了ＳＳＢＲ的加工性能,提高其拉伸细度和撕裂强度。当ＳＳＢＲ／ＮＲ（质量比）为８０／２０时,共混物的硫化胶具有最优的力学性能。     

普通、半有效和有效硫化体系的NR/BR共混胶料的疲劳寿命曲线方程*

研究了采用普通、半有效和有效硫化体系的ＮＲ／ＢＲ（共混比为７０／３０）硫化胶在同一表观交联密度下的疲劳寿命,比较了３种硫化体系硫化胶的疲劳特征参数β和Ｃ０值,并采用指数函数模型拟合出３种硫化体系硫化胶的疲劳寿命ＳＮ曲线方程,其中最大相对偏差只有－６５２％,相关系数均大于０９５３５,可较好地描述不同硫化体系的ＮＲ／ＢＲ共混胶料的动态疲劳过程。     

反式聚异戊二烯橡胶/NBR并用胶性能的研究

研究了反式聚异戊二烯橡胶（ＴＰＩ）／ＮＢＲ并用胶的耐油性能手力学性能,以及用ＴＰＩ接枝－甲基丙烯酸酯（ＴＰＩ－ｇ－ＭＭＡ）对并用胶进行的相容改性。研究结果表明,ＴＰＩ／ＮＢＲ并用胶耐油性能很好,但力学性能较差,ＴＰＩ－ｇ－ＭＭＡ可明显改善ＴＰＩ和ＮＢＲ两相之间的相容性,加入ＴＰＩ－ｇ－ＭＭＡ相容的ＴＰＩ－ＮＢＲ并用胶保持了很好的耐油性能,力学性能明显改善。     

稀土BR／SBR共混胶的性能

研究了４种共混比的ＬｎＢＲ／ＳＢＲ共混生胶、混炼胶及硫化胶的性能，并与ＮｉＢＲ／ＳＢＲ共混胶进行了对比。结果表明，共混生胶的ＭＬ均低于ＬｎＢＲ及ＳＢＲ；当ＬｎＢＲ／ＳＢＲ共混混炼胶的ＭＬ、剪切应力、出口膨胀及硫化速度均低于ＮｉＢＲ／ＳＢＲ共混胶，挤出物外观优于后者；共混硫化胶的拉伸强度、热空气老化、拉伸疲劳、湿滑、耐磨等性能均明显优于后者，生热和透气率高于后者。     

PVC／ENR／XNBR（NBR）动态硫化共混物

能干不氧化天然橡胶（ＥＮＲ）、聚氯乙烯（ＰＶＣ）和羧基丁腈橡胶（ＸＮＢＲ）之间的自硫化反应，实现了ＰＶＣ／ＥＮＲ／ＸＮＢＲ三元共混物的动态友化，由此得到了具有热塑性弹性体的一些典型特征的ＰＶＣ／ＥＮＲ／ＸＮＢＲ动态自硫化共混物。该人混物与自硫化反应不明显的ＰＶＣ／ＥＮＲ／ＮＢＲ共混物进行了比较，发现动态自硫化反应显著提高了共混物的综合性能。结果表明，当橡塑比为７０／３０时，前者的拉伸强度为１１．８     

丁苯橡胶辐射硫化和硫黄硫化的硫化胶性能比较

用各种多官能团单体（ＰＦＭ）作丁苯橡胶（ＳＢＲ）的辐射硫化的敏化剂，试验表明四羟甲基甲烷四丙烯酸酯（Ａ－ＴＭＭＴ）作敏化剂，在降低ＳＢＲ胶料辐射硫化必要剂量方面效果显著。所得硫化胶的拉伸强度、定伸应力、扯断伸长率及硬度等均优于硫黄硫化胶，且动态力学特性也与硫黄硫化胶相似。     

硫化剂DL-268在NR/SBR胶料中的应用

研究了硫化剂ＤＬ－２６８对ＮＲ／ＳＢＲ胶料各项性能的影响,试验结果表明,在ＮＲ／ＳＢＲ胶料中加入２份硫化剂ＤＬ－２６８,可改进抗硫化返原性,提高硫化胶在热氧老化或过硫化状态下的物理性能及胶－帘线之间的粘合力,降低硫化胶的疲劳温升。所得结果与所选择的试验配方构成有关。     

锡偶联S-SBR/BR并用胶性能的研究

研究了国产锡偶联Ｓ－ＳＢＲ／ＢＲ并用胶料的加工性能、物理性能及动态生热特性。研究结果表明,锡偶联Ｓ－ＳＢＲ加入适量均匀剂后门尼粘度可与ＢＲ相近;随ＢＲ并用量的增大,共混胶料的耐屈挠以及耐磨性能都有所提高,生热略有降低,强力性能下降;锡偶联Ｓ－ＳＢＲ／ＢＲ并用比为６０／４０,填充体系选用炭黑Ｎ２３４时,硫化胶综合性能达到最佳。     

动态硫化反式—1,4—异戊二烯和聚丙烯共混材料的研究

本文采用动态硫化法,对反式－１,４－聚异戊二烯（ＴＰＩ））和聚丙烯（ＰＰ）共混体系作了初步研究,确定了适宜的加工工艺及配方,对材料的力学性能测试结果表明：（１）以少量ＴＰＩ与ＰＰ共混,采用动态全硫化,可以有较少降低ＰＰ硬度、拉伸强度的情况下,明显改善其抗冲强度、抗撕裂性能等力学性能,获得优良的ＰＰ增韧材料;（２）ＴＰＩ增韧ＰＰ合适的制备工艺为：ＴＰＩ先与Ｓ、ＺｎＯ、ＳＡ、ＲＤ等在低温下（≤９０℃）     

用于全钢子午线轮胎胎侧胶的反式-1,4-聚异戊二烯/天然橡胶/顺丁橡胶并用胶的性能

研究了不同反式-1,4-聚异戊二烯(TPI)用量对用于全钢子午线轮胎胎侧胶的TPI/天然橡胶(NR)/顺丁橡胶(BR)并用胶力学性能、动态力学性能和热老化性能的影响,并对并用胶进行了配方优化。结果表明,当TPI/NR/BR的并用比(质量比)为15.0/42.5/42.5时,混炼胶外表光滑,硬度适中;TPI/NR/BR并用胶的硫化特性与NR/BR并用胶相比变化不大,且在保持后者力学性能的基础上,动态力学性能明显提高;经配方优化后,并用胶耐屈挠性优异,滚动阻力、压缩生热降低,是一种较为理想的全钢子午线轮胎胎侧胶材料。     

炭黑对TPI及其并用胶性能的影响

研究炭黑对反式 1,4 聚异戊二烯 (TPI)及其并用胶性能的影响。结果表明 ,填充炭黑后 ,TPI混炼胶的结晶度和物理性能下降 ;采用粒径较小的炭黑补强的TPI硫化胶、NR/TPI和SBR/TPI并用硫化胶的物理性能较好 ,但动态性能较差 ,采用粒径较大的炭黑补强的这 3种胶料的动态性能较好 ,但物理性能较差 ;采用炭黑N3 3 0补强的NR/TPI和SBR/TPI并用胶综合性能较好 ,可用作高速低滚动阻力轮胎胎面胶。     

Effects of the interaction of hardness,resilience, and fatigue properties on the abrasion properties of rubber blends

The establishment of prediction model for abrasion properties of vulcanizates, based on their simple physio‐mechanical properties, is a hot research field in tribology. The hardness (H), resilience (R), and dynamic fatigue fracture parameters (m) of rubber vulcanizates were combined together in this article, named as hardness–resilience product (H^mR), and its relationships with the abrasion loss for various vulcanizates [natural rubber (NR), styrene–butadiene rubber (SBR), butadiene rubber (BR), and their blends] was investigated by using Akron and DIN abrader. The results showed that, for NR/SBR blends with different SBR content, compared with log(H⁴R), the abrasion loss had much better linear relationship with log(H^mR) for both Akron and DIN abrasion. This good linear relationship, for both Akron and DIN abrasion, also appeared in the SBR/BR blends with different BR content. Furthermore, for both blending systems (NR/SBR and SBR/BR), when all the data above were put together, the abrasion loss also had good linear relationships with its log(H^mR) no matter for Akron or DIN abrasion, which indicated that this linear relationship had some universality. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 1212‐1219, 2013     

反式-1,4-聚异戊二烯的结晶性对丁苯橡胶/反式-1,4-聚异戊二烯共混硫化胶动态力学性能的影响

用动态力学分析仪和差示扫描量热仪研究了丁苯橡胶(SBR)/反式-1,4-聚异戊二烯(TPI)共混硫化胶的动态力学性能和结晶性能。结果表明,SBR与TPI的两相相容性良好。随着TPI用量的增加,SBR/TPI共混硫化胶的玻璃化转变温度向低温方向移动,且损耗因子峰值逐渐降低。用炭黑填充CV体系硫化SBR/TPI共混胶的损耗因子峰值低于相应的未填充胶料;而当TPI晶体熔融后,炭黑填充胶料的损耗因子要大于未填充者。不同硫化体系硫化SBR/TPI共混胶的损耗因子峰值和玻璃化转变温度从大到小的变化依次为CV体系、EV体系和DCP体系。     

充油对反式-1,4-聚异戊二烯及其与丁苯橡胶并用胶性能的影响

采用干法充油工艺,将门尼黏度为120的反式-1,4-聚异戊二烯(TPI)充芳烃油37.5份制备充油反式-1,4-聚异戊二烯(OETPI).对TPI、OETPI的生胶、硫化胶及其与丁苯橡胶(SBR)并用硫化胶的性能进行了对比.结果表明,OETPI生胶的硬度、门尼黏度、物理机械性能都比TPI的低;OETPI混炼胶的硫化速率比TPI混炼胶的高;OETPI硫化胶的100%和300%定伸应力、邵尔A硬度、拉伸强度等物理机械性能与TPI硫化胶的相比有所降低;磨耗、压缩生热、压缩永久变形增大.与TPI/SBR混炼胶相比,OETPI/SBR混炼胶具有更高的炭黑分散度,较高的硫化速率;OETPI/SBR并用硫化胶的抗湿滑性比TPI/SBR并用硫化胶明显提高,物理机械性能、滚动阻力和动态生热变化不大,耐屈挠龟裂性能提高.     

TPI/NR/BR并用胶的性能与应用

研究了不同反式-1,4-聚异戊二烯(TPI)用量及补强与填充体系对TPI/天然橡胶(NR)/顺丁橡胶(BR)并用胶力学性能、动态性能和热老化性能的影响。结果表明,当TPI/NR/BR的质量比为15.0/42.5/42.5时,混炼胶外表光滑,硬度适中;硫化胶的硫化特性变化不大,在保持基本配方硫化胶力学性能的基础上,动态力学性能明显提高。当加入4~8份白炭黑时,并用胶的撕裂强度、定伸应力提高,滚动阻力、压缩生热降低,是一种较理想的全钢子午线轮胎胎侧胶配方。     

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.     

高抗疲劳性轿车轮胎胎侧胶的配方设计与性能研究

研究反式-1,4-丁二烯-异戊二烯共聚橡胶(TBIR)的结晶性能、加工性能以及NR/BR/TBIR并用胶在轿车轮胎胎侧胶中的应用。结果表明:相比反式-1,4-聚异戊二烯(TPI),TBIR的结晶性能微弱、玻璃化温度更低;相比天然橡胶(NR)和顺丁橡胶(BR),TBIR具有优异的加工性能;相比NR,BR和TPI,TBIR的耐老化性能优异;相比NR/BR和NR/BR/TPI并用胶,NR/BR/TBIR(并用比为45/35/20)并用胶的物理性能优异,生热降低,耐裂口扩展性能显著提高。TBIR作为一种新型合成橡胶材料可应用于高耐疲劳轿车轮胎。     

Influence of rubber composition on change of crosslink density of rubber vulcanizates with EV cure system by thermal aging

Variation of the crosslink density of a rubber vulcanizate depending on the rubber composition after the thermal aging was studied with single rubber, biblend, and triblend vulcanizates of natural rubber (NR), butadiene rubber (BR), and styrene‐butadiene rubber (SBR). The efficient vulcanization (EV) system was employed to minimize the influence of free sulfur in the vulcanizate on the change of the crosslink density. Thermal aging was performed at 40, 60, and 80°C for 20 days with 5‐day intervals. The crosslink densities of the vulcanizates after the thermal aging increase. For the single rubber vulcanizates, variation of the crosslink density by the thermal aging has the order: SBR > BR > NR. For the biblend vulcanizates, variations of the crosslink densities of the NR/SBR and SBR/BR blends are larger than that of NR/BR blend. Variation of the crosslink density of the vulcanizate increases by increasing the SBR content in the vulcanizate. Variation of the crosslink density of the rubber vulcanizate depending on the rubber composition was explained by miscibility of the blends, combination reaction of the pendent groups, and mobility of the pendent group. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 75: 1378–1384, 2000     

Studies on xanthate/dithiocarbamate accelerator combination in NR/BR blends

Zinc butyl xanthate [Zn(bxt)₂] was prepared in the laboratory. The effect of this xanthate with zinc diethyl dithiocarbamate (ZDC) on the vulcanization of natural rubber (NR), polybutadiene rubber (BR), and NR/BR blend has been studied at different temperatures. The amounts of Zn (bxt)₂ and ZDC in the compounds were optimized by varying the amount of ZDC from 0.75 to 1.5 phr and Zn (bxt)₂ from 0.75 to 1.5 phr. The cure characteristics were also studied. HAF filled NR, BR, and NR/BR blend compounds were cured at different temperatures from 60 to 150°C. The sheets were molded and properties such as tensile strength, tear strength, crosslink density and elongation at break, compression set, abrasion resistance, etc. were evaluated. The results show that the mechanical properties of 80NR/20BR blends are closer to that of NR vulcanizates, properties of 60NR/40BR blends are closer to BR vulcanizates, while the 70NR/30BR blends show an intermediate property. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 3516–3520, 2007