预分散氧化锌母粒ZnO-80在IIR硫化胶囊中的应用

研究了预分散氧化锌母粒ZnO-80在IIR硫化胶囊中的应用,结果表明ZnO-80在IIR硫化胶囊中代替普通粉状的间接法氧化锌,混炼胶的分散性能明显提高,同时硫化胶的各项物性及外观质量有所提高,使用寿命提高40%。     

天然橡胶/丁苯橡胶/白云母复合材料的性能研究

研究硫化体系、硫化条件和白云母用量对天然橡胶/丁苯橡胶/白云母复合材料性能的影响。结果表明:复合材料优化硫化体系为促进剂D 1,促进剂CZ 0.6,促进剂DM 0.6,硫黄2.5;适宜的硫化条件为145℃×8 min;当改性白云母用量为20,40和60份时,复合材料的物理性能和耐磨性能满足工业车辆轮胎胎面胶和垫带胶、农业轮胎胎面胶和垫带胶、载重型和非载重型力车轮胎胎面胶以及鞋跟胶料国家或行业标准要求;改性白云母用量为20份时,复合材料的物理性能和耐磨性能可以满足大部分橡胶制品的要求。     

氧化锌预分散母胶粒对NR/BR体系胎面胶性能的影响

研究自制氧化锌质量分数为80%的预分散母胶粒ZnO-80与氧化锌粉(ZnO)对天然橡胶(NR)和顺丁橡胶(BR)共混胎面胶性能的影响。结果表明,当体系中使用自制ZnO-80(A4)代替ZnO粉时,表观交联密度提高9.8%,拉伸强度提高18.6%,邵尔A硬度无变化,磨耗值降低35.7%。橡胶加工分析仪(RPA)测试表明,使用ZnO-80(A4)胎面胶的滚动阻力和生热量比使用ZnO粉的胎面胶要低,活性剂分散性更好。     

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。     

充环烷油溶聚丁苯橡胶在胎面胶配方中的应用

研究充环烷油溶聚丁苯橡胶(SSBR)在胎面胶配方中的应用.结果表明:与天然橡胶(NR)硫化胶相比,SS-BR硫化胶0℃下的损耗因子(tanδ)较大、60℃下的tanδ较小,用于胎面胶中可赋予轮胎较高的抗湿滑性能和较低的滚动阻力;SSBR与NR具有良好的相容性,当SSBR/NR并用比为20/80时,硫化胶综合物理性能良好;SSBR用于胎面胶中可提高轮胎的抗湿滑性能、干路面和冰路面的抓着力,降低滚动阻力,适用于高性能轮胎.     

双金属稀土促进剂对丁苯橡胶/天然橡胶胎面胶的影响

通过配位反应制备得到双金属硫化促进剂二乙基二硫代氨基甲酸锌镧配合物(ZnLaDC),在不添加传统活化体系氧化锌(ZnO)/硬脂酸(SA)的情况下,考察了ZnLaDC用量对丁苯橡胶(SBR)/天然橡胶(NR)胎面胶复合材料硫化特性及物理机械性能的影响,并与传统硫化体系二乙基二硫代氨基甲酸锌(ZnDC)/ZnO/SA制备的硫化胶性能进行了对比。结果表明,随着ZnLaDC用量的增加,SBR/NR胎面胶复合材料的硫化特性、压缩疲劳生热性能及耐磨性得到有效提高,当ZnLaDC用量为5份时,复合材料的综合性能最佳。与传统硫化体系ZnDC/ZnO/SA制备的硫化胶相比,采用ZnLaDC制备的硫化胶具有更优异的静态力学性能及耐切割性。     

稀土丁戊橡胶性能及在胎面胶中应用的研究

通过与俄罗斯丁戊橡胶和BR对比 ,研究了国产新型稀土丁戊橡胶 (Nd BIR)的加工性能、未硫化胶性能和硫化胶物理性能 ,并探讨了Nd BIR在轮胎胎面胶中的应用。结果表明 ,Nd BIR混炼包辊性好 ,混炼功耗低 ,混炼胶片表面光滑平整 ;胶料硫化速度快 ,硫化曲线平坦 ,门尼焦烧时间长 ;硫化胶撕裂强度高 ,耐疲劳、耐磨耗和耐老化性能好 ,压缩生热低 ,低温性能极佳。NR/Nd BIR(并用比 70 /3 0和 5 0 /5 0 )并用体系胎面胶硫化速度快 ,焦烧时间长 ;硫化胶强伸性能好 ,耐磨、耐老化、耐疲劳和抗湿滑等性能满足轮胎胎面要求。Nd BIR用于轮胎胎面胶中是可行的     

排胶温度对石墨烯改性NR/BR 胎面胶性能影响的研究

本文采用机械混合法在NR/BR胎面胶中加入碳纳米材料石墨烯,研究在不同排胶温度下石墨烯对胎面胶力学性能、流变性能及导热性能的影响。研究结果表明：在密炼机中加入石墨烯的胎面胶各种性能要优于在开炼机中加入的。在排胶温度为135℃时胶料体系中的填料网格结构最少,分散性和导热性最高,此时NR/BR硫化胶的力学性能最好,动态力学性能最优。     

促进剂TBSI-80在工程机械轮胎胎面胶中的应用

研究促进剂TBSI-80在工程机械轮胎胎面胶中的应用。结果表明:在工程机械轮胎胎面胶中以促进剂TBSI-80替代促进剂NS,胶料的门尼焦烧时间延长,硫化速度减慢;硫化胶的压缩生热降低,其他物理性能基本相当;成品轮胎的耐久性能提高,可减少环境污染。     

NR/SBR并用于工程胎胎面胶性能研究

以NR和SBR为基本胶种,改变反式1,4-异戊二烯(TPI)在工程轮胎胎面胶配方中的含量,以找到较好的性能并用比;添加DTDM改变硫化体系,得出胶料的性能变化及硫化特性的变化规律;在优化的硫化体系中,改变不同种类补强剂的用量,找出其对硫化胶的物理机械性能尤其是生热性能的影响;应用特种补强材料进一步考察硫化胶的物理机械性能和动态生热性能,使相应性能有所提高。     

Homogeneous Styrene Butadiene/Acrylonitrile Butadiene Rubber Blends

The graft copolymerization of acrylonitrile (AN) onto butadiene rubber (BR) was carried out in toluene at 80°C, using dibenzoyl-peroxide (BPO) as initiator. The synthesized poly acrylonitrile-grafted-butadiene rubber (AN-g-BR) was characterized by N% elemental analysis and Fourier-transform infrared (FT-IR) spectroscopy. Styrene butadiene rubber/acrylonitrile butadiene rubber (SBR/NBR) blends were prepared with different blend ratios in presence and absence of AN-g-BR, where the homogeneity of such blends were examined with intrinsic viscosity (η) measurements, differential scanning calorimetry (DSC), and scanning electron microscopy (SEM). The scanning electron micrographs illustrate disappearance of the macro-scale phase separation of SBR/NBR rubber blend as a result of the incorporation of AN-g-BR into that blend. Viscosity measurements confirm homogeneity of that blend. Differential Scanning Calorimetry traces exhibit shifts in glass transition temperatures (T _g's) of SBR and NBR in their blend, indicating some degree of homogeneity. Physico-mechanical properties of the rubber blend vulcanizates with different blend ratios, in presence and absence of AN-g-BR, were investigated before and after accelerated thermal aging. The SBR/NBR (25/75) homogeneous blend possessed the best physico-mechanical properties after thermal aging, together with the best swelling behavior in motor oil. The physico-mechanical properties of SBR/NBR (25/75) filled blend with different types of inorganic fillers during thermal aging were studied.     

白炭黑/丁苯吡橡胶/顺丁橡胶复合材料的性能研究

对比研究白炭黑填充溶聚丁苯橡胶/顺丁橡胶(BR)、乳聚丁苯橡胶/BR和丁苯吡橡胶(VPSBR)/BR复合材料的性能。结果表明:白炭黑在VPSBR/BR并用胶中的分散较好,相应胶料定伸应力较高,0℃下的tanδ较大,耐磨性能较好;提高VPSBR/BR并用胶中BR用量可降低胶料60℃下的tanδ,且耐磨性能变化不大。     

氢化丁腈橡胶／超细全硫化粉末丁腈橡胶共混物的结构与性能研究

采用熔融共混工艺制备了氢化丁腈橡胶（HNBR）／超细全硫化粉末丁腈橡胶（UFPNBR）共混物,研究了共混物相态结构、动态力学性能、力学性能及老化性能,并与HNBR／NBR共混物作了对比。透射电镜观察表明：在HNBR／UFPNBR体系中,HNBR容易形成连续相,UFPNBR为分散相;在HNBR／NBR体系中容易形成双连续相结构。DMA动态力学性能分析表明：2种共混物都只有一个tanδ峰,且相容性较好。HNBR／UFPNBR共混物在玻璃化转变区的tanδ峰值逐渐降低,而HNBR／NBR体系的tanδ峰值先减小后增大。加入适量的UFPNBR能降低HNBR／UFPNBR共混物的压缩永久变形;与常规共混胶相比,HNBR／UFPNBR具有低脆性温度和良好的耐老化性能,但力学性能略低。     

The Behaviour of Styrene Butadiene Rubber/Acrylonitrile Butadiene Rubber Blends in the Presence of Chlorinated Hydrocarbons

The behaviour of styrene butadiene rubber/acrylonitrile butadiene rubber (SBR/NBR) blends in the environment of chlorinated hydrocarbons, such as carbon tetrachloride, chloroform and dichloromethane, in the temperature range 32–52°C has been investigated. Sulphur, dicumyl peroxide and a mixed system consisting of sulphur and peroxide were used as the vulcanising systems for the matrix. The effects of vulcanising agents, blend composition, solvents and temperature on the sorption characteristics were studied. The sulphur-vulcanised systems exhibited the highest solvent uptake and those with dicumyl peroxide as the vulcanising agent the lowest. This difference has been explained on the basis of the nature of cross links established between the polymer chains during vulcanisation. The solvent uptake increased with an increase in SBR content in the blends when carbon tetrachloride was used as the penetrant, whilst it decreased with SBR content when chloroform and dichloromethane were used as the probes. This behaviour has been explained on the basis of the polarity difference of the solvents. For a given blend system, the solvent uptake was maximum when dichloromethane was used as the solvent and minimum when carbon tetrachloride was used. This has been accounted for in terms of the difference in the size of the penetrants. The intrinsic diffusion coefficient, permeation coefficient, cross link density and interaction parameter were estimated from the sorption data. Thermodynamic parameters such as enthalpy and free energy changes were also calculated. These values indicate that the sorption process in the present systems is exothermic and is more spontaneous in sulphur-vulcanised systems. The experimental results, when compared with different theoretical diffusion models, have been found to be closer to Robeson’s and Maxwell’s models.     

Natural Weathering Test of Styrene Butadiene Rubber and Recycled Acrylonitrile Butadiene Rubber (SBR/NBRr) Blends

The effect of recycled acrylonitrile butadiene rubber (NBRr) content of SBR/NBRr blends on natural weathering was studied. Three different size of NBRr (S1; 117–334 µm, S2; 0.85–15.0 mm and S3; direct sheeted form) were used and the blends were exposed to natural weathering for 3 and 6 months. The results indicated that the SBR/NBRr blends with smallest size of NBRr (S1) show a better retention of tensile properties, which are able to withstand better weathering than coarser size (S2 and S3) of SBR/NBRr blends. The presence of hydroxyl, carbonyl and nitro group after exposure to natural weathering was detected in FTIR analysis, which related to the UV oxidation process of rubber blends. The scanning electron microscopy proved that the SBR/NBRr blends with smallest size of NBRr (S1) with higher content of NBRr, shows a better resistant to natural weathering.     

不同结构顺丁橡胶/溶聚丁苯橡胶并用胶的性能研究

研究不同结构顺丁橡胶(BR)[镍系BR(NiBR)牌号9000,钕系BR(NdBR)牌号CB24,SKD-NdII,Nd22EZ和Nd24EZ]对BR/溶聚丁苯橡胶(SSBR)并用胶性能的影响。结果表明:5种牌号BR的顺式1,4-结构摩尔分数基本一致(约为0. 96);采用NiBR的硫化胶性能与采用NdBR的硫化胶无明显差别,甚至部分性能略优;采用CB24的硫化胶物理性能、耐疲劳裂纹扩展性能和抗切割性能较好,抗湿滑性能优良,但滚动阻力较大;采用Nd24EZ的硫化胶撕裂强度较大,裂纹扩展速率较小;采用Nd22EZ的硫化胶抗湿滑性能较好,滚动阻力较小;采用Nd22EZ与Nd24EZ的硫化胶中白炭黑的分散性较好。     

顺丁、丁腈橡胶离聚体改性聚氯乙烯研究

用马来酸酐接枝橡胶和金属离子交联形成离聚体的方法可提高顺丁橡胶(BR)、丁腈橡胶(NBR)、PVC三元共混物的相容性，以交联剂、引发剂、接枝单体为三要素，采用正交试验方法，通过综合评分法，优选了三元离聚体配方，在此基础上用部分硬脂酸锌代替无机氧化锌作离子交联剂，使合金材料获得了满意的性能，与未经改性PVC/BR/NBR三元共混物相比，硬脂酸锌离子交联马来酸酐接枝的三元合金的拉伸强度提高了101％，断裂伸长率增加113％，红外光谱证明了马来酸酐接枝顺丁胶与锌离子的离子交联的存在，且硬脂酸锌的效果优于氧化锌。     

Natural Rubber/Acrylonitrile Butadiene Rubber Blend Membranes: Vapor Permeation Properties

Natural rubber (NR)/Acrylonitrile butadiene rubber (NBR) blend membranes, prepared by using dicumyl peroxide as the crosslinking agent, were tested for their vapor permeation characteristics. The permeation studies were conducted using three chlorinated hydrocarbons, viz. dichloro methane, chloroform, and carbon tetrachloride. The effects of the blend ratio, compatibilizer, penetrant size, and temperature on the vapor permeability of the membranes were investigated. The permeability of the blends was found to decrease with an increase in the NBR content, which has been attributed to the inherent solvent resistant nature of NBR. The permeation behavior of compatibilized blends was compared with those of the uncompatibilized blends. The separation efficiencies of the membranes were also tested using chloroform/acetone mixtures to complement the observations from the vapor permeation experiments.     

湿法水磨胶粉在天然橡胶/顺丁橡胶并用 配方体系中的应用

研究废旧轮胎湿法水磨胶粉在天然橡胶（NR）/顺丁橡胶（BR）并用配方体系中的应用。结果表明：以湿法水磨胶粉部分替代炭黑N330,胶料的硬度、定伸应力和拉伸强度明显降低,拉断伸长率和回弹值明显增大,60 ℃时的损耗因子减小,动态拉伸储能模量大幅降低;在NR/BR并用胎圈胶配方中以30份湿法水磨胶粉替代5～10份炭黑N330,胶料的物理性能和动态性能在相同水平,同时可降低原材料成本,利于环保。     

改性高岭土/顺丁橡胶复合材料的制备

以广西北海高岭土为研究对象,采用干法进行表面改性,用其填充顺丁橡胶,制备高岭土/顺丁橡胶复合材料。通过活化指数和复合材料力学性能对改性高岭土进行评价。确定了高岭土改性的工艺条件为：活化剂棕榈油1%;改性剂WD-70 1%;辅助改性剂硬脂酸1%;改性温度90℃,改性时间20min。其中,最优的复合材料拉伸强度达到14.13MPa,撕裂强度达到26.90kN.m_-1,邵氏硬度57.9A,磨耗量0.921cm₃。结果表明,微细粒级改性高岭土填充顺丁橡胶,制备的复合材料力学性能均能达到橡胶鞋底国标(HG/T3082-1999)要求。复合材料拉断面的SEM照片显示,改性高岭土与橡胶基质融合较好。