Effect of bonding systems on the adhesion of butyl rubber to polyester fabric

An adhesion promoter system composed of hexamethylene tetramine, resorcinol, and hydrated silica was compounded with butyl rubber mix. This mix was spread over untreated polyester fabric. The resorcinol was also replaced by o-aminophenol, m-aminophenol, or m-phenylene diamine. The rubber-fabric materials were subjected to aging or exposed to ionizing radiation. The peel strength, permeability, dielectric constant, and electrical resistivity were examined.     

Effect of butyl rubber type on properties of polyamide and butyl rubber blends

Polyamide‐12 was blended with butyl rubber, bromobutyl rubber, and chlorobutyl rubber with and without a sulfur curing system. Mechanical properties for dynamically vulcanized blends generally exceed those made with no vulcanization. Chlorobutyl‐containing blends prepared by dynamic vulcanization have higher tensile strength and elongation at break values in comparison to those made from other butyl rubbers. For a variety of polyamide/rubber blends made by dynamic vulcanization, there is very little effect of rubber percentage unsaturation and Mooney viscosity on the mechanical properties of the blends. In chlorobutyl‐containing blends prepared by dynamic vulcanization, the swelling index values attributed to the rubber portion decrease as rubber content decreases, and it is likely that the polyamide phase completely surrounds the rubber particles at compositions exceeding approximately 25% polyamide. Swelling index results can be correlated with elongation at break values for similar blends. The results of differential scanning calorimetry suggest that the polyamide phase is not a neutral component in high shear mixing with butyl rubbers with or without curing agents. Rheological studies indicate strong non‐Newtonian behavior for all blends of polyamide‐12 with butyl rubbers. Scanning electron microscopy on polyamide‐12/butyl rubber blends indicates compatibility for butyl rubbers in the order of chlorobutyl > bromobutyl > butyl rubber. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 1423–1435, 2004     

丁苯橡胶表面处理技术对粘接强度的影响

丁苯橡胶表面是非极性的,为了增强丁苯橡胶与金属或者其他材料之间的粘接强度,需娶对橡胶表面进行处理。综述了当前国内外橡胶表面处理的常用方法、原理及研究进展。     

Effect of water on the strength of rubber bonding with adhesives based on reactive oligomers

The effect of water redistribution between SKEPT-40 rubbers and reactive adhesives based on SKN-18KTR mixtures with ED-20 on the strength of adhesive compositions was studied. Water vapor sorption isotherms were measured. It was shown that the water content of rubbers during their scheduled conditioning at a humidity of 65–70% leads to the spontaneous redistribution of water between the substrate and the adhesive. This process is accompanied by the retardation of the formation of the adhesive network structure and, as a consequence, by a fall in the strength of adhesive joints. The mechanism of formation and failure of SKEPT-40-(SKN + ED-20) adhesive joints was revealed. A procedure for calculating the amount of water capable of redistributing between the elements of adhesive joints is proposed. Rubber conditioning parameters that ensure the required quality of bonding the rubbers with SKN-18KTR-ED-20 compositions were determined.     

共混比对预硫化多官能化丁基橡胶/天然橡胶共混胶性能的影响

研究了预硫化工艺下不同共混比对多官能化丁基橡胶/天然橡胶(MFIIR/NR)共混胶硫化特性、力学性能、耐老化性能以及微观形貌的影响,同时与传统工艺制备的共混胶的性能进行了对比。结果表明,当MFIIR作为主要组分时,预硫化法混炼胶的正硫化时间随MFIIR/NR共混比(质量比)的增大而缩短,最高转矩、最高转矩与最低转矩之差都随共混比的增大而呈现变小的趋势;随着预硫化法共混胶共混比的增大,共混胶的力学性能降低,耐老化性能提高,但都明显高于传统法共混胶的力学性能;预硫化共混胶拉伸断面的致密程度较传统法共混胶高,且随共混比的增大,拉伸断面的形貌趋于平坦。     

铝/丁羟胶粘接强度的率相关特性研究

参照试验标准设计了用于测量铝与端羟基聚丁二烯(丁羟胶)粘接强度的单轴拉伸试验,通过变换拉伸速率获得了粘接强度与拉伸速率的关系,随着拉伸速率的增大粘接强度不断升高。同时进行了丁羟胶片的单轴拉伸试验并获得了200%应变范围内的应力-应变曲线。结果发现,丁羟胶作为铝板的胶粘剂的粘接强度明显大于丁羟胶片自身的强度,且粘接时丁羟胶的伸长率明显下降。     

端氯基聚苯乙烯在丁基橡胶合成中的应用

采用自由基聚合技术,以苯乙烯为单体,偶氮二异丁腈为引发剂,在四氯化碳存在下,于60℃,24h合成了端氯基聚苯乙烯。采用正离子聚合工艺,以异丁烯、异戊二烯为单体,AlCl3/H2O为引发体系,引发反应前加入端氯基聚苯乙烯,在一氯甲烷溶剂中于-80℃,0．5h下合成了丁基橡胶。结果表明,当端氯基聚苯乙烯质量分数为1．0％～1．5％时,可以起到稳定丁基橡胶淤浆的作用。随着端氯基聚苯乙烯质量分数增加,丁基橡胶的相对分子质量有一最大值,而单体转化率略有上升。     

Effect of temperature on the joint strength of a silyl-modified polymer-based adhesive

Temperature is a very important factor that must be fully considered in the study on the adhesive joint strength. In this paper, a silyl-modified polymer-based adhesive ISR 70-08 which is widely used in engineering was studied. Dog-bone specimens were fabricated and tested at ?40°C, room temperature (RT), and 90°C. Results show a decrease in the main mechanical properties with increasing temperature. Butt joints (BJs), single-lap joints (SLJs), and Scarf joints (SJs) were fabricated and tested at different temperatures. A quadratic polynomial expression was an ideal choice to express the joint strength as a function of temperature which was obtained using the least-squares method. Temperature combinations of ?40°C, 0°C, and 90°C were obtained to study the effect of temperature on the joint strength more easily for this adhesive. A three-dimensional surface, consisting of temperature, adhesive angle, and joint strength was presented to facilitate the application of bonding structures in engineering     

Effect of crosslinking and field strength on the electrical properties of carbon/polyolefin composites with a large positive temperature coefficient of resistivity

Crosslinking is a promising method for stabilizing the electrical properties of polyolefin composites with a positive temperature coefficient of resistivity (PTCR) for application as self-controlled heaters. An interesting phenomenon is that the measured room temperature resistivity of such materials is independent of applied voltage at low DC fields, but crosses over to display an apparent decrease with the accretion of voltage above a critical value. Measured current vs. time of voltage application has been recorded that shows an equilibrium varying with temperature and voltage. Theoretical approaches to these results are discussed.     

溴化丁基橡胶/丁腈橡胶并用胶微观结构及性能研究

用改性沥青作相容剂,研究溴化丁基橡胶(BIIR)/丁腈橡胶(NBR)并用胶的微观结构和性能。结果表明:与未添加改性沥青CJ-100的BIIR/NBR并用胶相比,添加改性沥青CJ-100的BIIR/NBR并用胶的相容性较好,加工性能改善,气密性、耐屈挠和耐臭氧性能提高;添加5份改性沥青CJ-100的BIIR/NBR(并用比为80/20)并用胶物理性能、气密性、耐屈挠和耐臭氧性能较好,气密性接近全BIIR胶料,有望用于全钢载重子午线轮胎气密层。     

氯化丁基橡胶/聚丙烯酸酯阻尼橡胶的力学性能

采用聚丙烯酸酯(PA)为第二组分,与氯化丁基橡胶（CIIR)制备了CIIR／PA阻尼橡胶,分析了CIIR／PA共混物的结构,讨论了原料组成、交联剂用量和填料种类对其力学性能的影响、结果表明,CIIR／聚(丙烯酸乙酯-甲基丙烯酸丁酯)[P(EA-BMA)]共混物的正硫化时间为10min．CIIR／聚丙烯酸乙酯(PEA)硫化共混物中存在共交联结构;共交联CIIR／PEA共混物形成了双相连续的微观相态结构;当P(EA-BMA)中PBMA链段的质量分数增加到20%时,共交联CIIR／P(EA-BMA)共混物的拉伸强度和100％定伸应力下降,当P(EA-BMA)中PBMA链段的质量分数继续增加,共混物的拉伸强度和100％定伸应力又逐渐上升,当酚醛树脂(PR)用量不大于20份时,随着PR用量的增加,共交联CIIR／PEA共混物的100％定伸应力和邵尔A型硬度增大,拉伸强度和扯断伸长率减小;当PR用量为30份时,共混物的100％定伸应力减小,拉伸强度增大;填料中以炭黑的增强效果最好,玻璃微球增强效果最差。     

Effect of concentration and temperature on the electrical conductivity of butyl rubber loaded with different types of carbon black

In this study we are interested in the effect of concentration and temperature on the electrical resistivity of butyl rubber (IIR) loaded with two types of carbon black, (namely, high abrasion furnace black (HAF), and fast extrusion furnace black (FEF)). It was found that the conductivity at low carbon black concentrations is mainly achieved by thermal activation of carriers. Tunneling mechanism at low termperature followed by thermal activation at relatively high temperature is found to be predominant for moderate concentrations for both carbon blacks. The metal-like behaviour which was observed in highly loaded compounds was attributed to both, the thermal expansion of the tunneling paths between carbon-carbon agglomerates and the breakdown of carbon agglomerates with temperature.     

动态硫化工艺对丁基橡胶/聚丙烯热塑性硫化胶性能的影响

考察了3种不同动态硫化工艺(M 1、M 2和M 3)对丁基橡胶(IIR)/聚丙烯(PP)热塑性硫化胶(TPV)结构与性能的影响,并考察了转子转速和动态硫化时间对IIR/PP TPV物理机械性能的影响。结果表明,不同动态硫化工艺制备的TPV的Payne效应均随着应变的增大而减小,采用M 3工艺制备的TPV的网络结构最强。采用3种工艺制备的TPV的拉伸强度由大到小依次为:M 3、M 2、M 1。采用M 2和M 3工艺制备的TPV中IIR与PP相容性较好。不同动态硫化工艺制备的TPV中IIR均呈不规则长条状分散在PP中,采用M 1工艺制备的TPV中交联IIR颗粒的尺寸最大,采用M 3工艺制备的TPV中交联IIR相颗粒和滑石粉填料分散较均匀。随着动态硫化过程中转子转速的提高及动态硫化时间的延长,采用M 3工艺制备的TPV的拉伸强度和扯断伸长率均先增加后减小。当转子转速为80 r/min、动态硫化时间为5 min时,IIR/PP TPV的物理机械性能较好。     

Thermoreversible crosslinking of maleic anhydride grafted butyl rubber with multiple hydrogen bonding arrays

Thermoreversible crosslinking supramolecular rubber with multiple hydrogen bonds are prepared via reaction of maleic anhydride grafted butyl rubber (MAn‐g‐IIR) with 3‐amino‐1,2,4‐triazole catalyzed by tetrabutyl ammonium bromide. Then, the hydrogen bonding arrays are introduced via the reaction between the obtained amide triazole‐carboxylic acid groups. Microphase‐separated aggregates that acts as physical crosslinks in the MAn‐g‐IIR is significantly tightened and strengthened after introducing multiple hydrogen bonds, resulting in increasing of X‐ray powder diffraction intensity and drastically improvement of tensile strength. After heating‐cooling treatment up to three cycles, no evidence of chemical change is observed from Fourier transform infrared spectra, and the tensile strength of thermoreversible crosslinking IIR was still much higher than that of the MAn‐g‐IIR. The reprocessability of this material was due to the thermoreversibility of hydrogen bond at elevated temperature, while the maintenance of tensile properties is due to the recovery of hydrogen bond during cooling. POLYM. ENG. SCI., 54:1783–1790, 2014. © 2013 Society of Plastics Engineers     

增容剂对动态硫化氯化丁基橡胶/尼龙12热塑性弹性体性能的影响

分别以聚丙烯接枝马来酸酐( PP -g - MAH)、苯乙烯-乙烯-丁二烯-苯乙烯共聚物接枝马来酸酐(SEBS-g- MAH)以及新型改性剂苯乙烯-共轭二烯烃嵌段共聚物选择加氢物(SEPS)作为增容剂,考察了不同增容剂对动态硫化氯化丁基橡胶/尼龙12热塑性弹性体(PA 12/CIIR TPV)物理机械性能的影响,并研...     

Effect of the network topology on the tensile strength of natural rubber vulcanizate at elevated temperature

The influence of network topology on tensile strength at elevated temperature of natural rubber compounds vulcanized with different systems was studied. The tensile strength behavior of natural rubber at high strain is attributed to the capacity to crystallize on stretching. Variation of this property with the temperature and/or crosslink density was related, not only with the nature of the crosslinks, but also with their spatial distribution. In this sense, measurements of the freezing point depression of cyclohexane imbibed in the rubber matrix were used to evaluate the spatial distribution of the crosslinks. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 98: 1219–1223, 2005     

异戊二烯含量对硫黄硫化丁基橡胶硫化特性的影响

本文主要通过无转子硫化仪研究异戊二烯含量对硫黄促进剂体系硫化丁基橡胶硫化特性及硫化动力学的影响。研究表明,在实验范围内,Ghoreishy动力学方程能较好地描述丁基橡胶硫磺硫化的行为。在相同硫化温度下,随着异戊二烯单元含量的增多,焦烧时间、正硫化时间逐渐缩短,交联密度明显增加,高温抗硫化返原性增强。随着硫黄用量的增多,丁基橡胶硫化胶的交联密度随硫黄用量呈线性增加,高异戊二烯含量的丁基橡胶硫黄硫化效率大幅度提高,反应级数增大,硫化活化能Ea明显降低,但异戊二烯含量从5.1mol.%增加到7mol.%时,硫黄硫化效率并未出现明显增加,Ea基本不变。     

Nitrile rubber/sliding graft copolymer damping material with significantly improved strength and damping performance

Nitrile rubber (NBR)/sliding graft copolymer (SGC) composites with significantly improved strength and damping property are successfully prepared. SGC is a novel kind of supramolecular material with sliding crosslink junctions. The micromorphology analyses of NBR/SGC composites indicate that the SGC phase with particle size less than 500 nm is fairly uniformly dispersed in the NBR matrix. As SGC content increases, the loss factors (tan δ) of NBR/SGC composites increase gradually. Specifically, the tan δ of NBR/SGC (100/40) is about 1.2 times higher than that of pristine NBR rubber. The tensile strength and elongation at break of NBR/SGC composites are unexpectedly improved after the addition of SGC. The significantly improved damping performance and tensile strength can be ascribed to the pulley effect of SGC and the strong interfacial hydrogen bonds between SGC and NBR. The high damping performance and good mechanical strength make the NBR/SGC composite a promising high-performance damping material. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47188.     

硫化体系对氯化丁基橡胶/尼龙12动态硫化胶性能的影响

研究了氧化锌、N,N’-间苯撑双马来酰亚胺(HVA-2)/氧化锌和1,3-双柠糠酰亚胺甲基苯(PK 900)/氧化锌3种硫化体系下氯化丁基橡胶(CIIR)/尼龙(PA)12混炼胶的硫化特性及CIIR/PA 12动态硫化胶(TPV)的物理机械性能和微观相结构,并考察了PK 900与氧化锌不同配比对CIIR/PA 12TPV物理机械性能、流变性能及微观相结构的影响。结果表明,PK 900/氧化锌的硫化速率介于氧化锌和HVA-2/氧化锌两者之间,由其制备的TPV橡胶相粒径为1～2μm,均匀分布在树脂相中,物理机械性能最优;固定PK 900用量为3份时,随着氧化锌用量的减少,CIIR/PA 12 TPV的拉伸强度、扯断伸长率和100%定伸应力均呈现先增大后减小的趋势;当PK 900/氧化锌(质量比)为3/5时,CIIR/PA 12TPV的物理机械性能最佳,且呈现低剪切速率高黏度、高剪切速率低黏度的特性。     

Effect of copper chelates on U.V. stability of butyl rubber and SBR rubber

An investigation of the photo-oxidative degradation and stabilization of IIR and SBR in the temperature range of 258 to 313°K in air with a monochromatic light of 366 nm in the absence and presence of various concentrations of the different copper chelates has been described. The stabilizer performance in IIR and SBR was accessed by carbonyl index and quantum yield measurements. The changes of IIR and SBR during the irradiation with an ultra-violet light (366 nm) have been conducted by viscometrically and actinometric techniques. Irradiations were conducted on the films at 0, 2, 4, 6, 8, 10, 12 and 14 hours and various parameters were obtained.