硫化剂对丙烯酸酯橡胶/乙烯丙烯酸酯橡胶共混胶性能的影响

为提高丙烯酸酯橡胶(ACM)/乙烯丙烯酸酯橡胶(AEM)共混胶的综合性能,采用硫化剂Diak No 1与促进剂Vulcofac ACT 55组成硫化体系,研究了硫化剂用量对ACM/AEM共混胶性能的影响。结果表明,随着Diak No 1用量的增加,共混胶焦烧时间逐渐延长,硫化反应速率逐渐减小;共混胶物理机械性能、耐热老化性能和耐IRM 903标准油性能逐渐提高,压缩永久变形性能先提高后降低。动态力学性能分析和差示扫描量热分析结果表明,随着Diak No 1用量的增加,共混胶的玻璃化转变温度逐渐升高,储能模量逐渐增大。     

促进剂对丙烯酸酯橡胶/乙烯丙烯酸酯橡胶共混胶性能的影响

考察了传统促进剂DOTG、环保促进剂XLA-60和ACT 55对丙烯酸酯橡胶(ACM)/乙烯丙烯酸酯橡胶(AEM)共混胶的硫化特性、物理机械性能、耐热空气老化性能、耐油性能、压缩永久变形及耐低温性能的影响。结果表明,与传统促进剂DOTG相比,加入新型环保促进剂ACT 55或XLA-60的ACM/AEM共混胶的硫化速率均有所提高,硫化胶交联密度增大,其中加入ACT 55的共混胶交联密度最大。促进剂ACT 55和XLA-60均能提高共混硫化胶的物理机械性能、耐热空气老化性能和压缩永久变形性能。添加XLA-60的共混硫化胶有较好的耐ASTM No.1标准油性能,而在IRM 903标准油中,加入DOTG的共混硫化胶的性能更好。     

环保型增塑剂对丙烯酸酯橡胶/乙烯丙烯酸酯橡胶共混胶性能的影响

研究了环保型增塑剂RS-107、RS-700、RS-735和TegMeR?812对丙烯酸酯橡胶(ACM)/乙烯丙烯酸酯橡胶(AEM)共混胶性能的影响,结果表明,随着增塑剂的加入,ACM/AEM共混胶的转矩明显下降,不同增塑剂对共混胶硫化影响的差别不大。加入4种增塑剂均使得共混硫化胶的硬度、拉伸强度和100%定伸应力减小而扯断伸长率增大,压缩永久变形性能和热稳定性都出现了不同程度的下降,耐低温性能得以改善,提高了耐IRM 903标准油性能,但对耐ASTM No 1标准油性能的影响不大。加入增塑剂使得共混胶的玻璃化转变温度明显向低温方向偏移、储能模量减小。其中,RS-700赋予共混硫化胶最好的综合性能。     

炭黑对丙烯酸酯橡胶/乙烯丙烯酸酯橡胶共混胶性能的影响

考察了炭黑种类对丙烯酸酯橡胶(ACM)/乙烯丙烯酸酯橡胶(AEM)共混胶硫化特性、物理机械性能、耐油性能、动态力学性能及热稳定性等的影响。结果表明,与未加入炭黑的试样相比,加入不同种类炭黑后共混胶的最大转矩(M_H)、最小转矩(M_L)及二者之差(M_H-M_L)均显著增大,焦烧时间(t_(10))和正硫化时间(t_(90))均缩短。共混硫化胶的物理机械性能、耐油性能及热稳定性均显著增强,但压缩永久变形变差,玻璃化转变温度均升高,损耗因子峰值均下降。随着炭黑粒径的增大,共混胶的M_H、M_L和M_H-M_L逐渐减小,t_(10)和t_(90)逐渐延长,物理机械性能逐渐变差,但热稳定性及压缩永久变形逐渐升高。加入炭黑N 990的共混硫化胶的热稳定性较差。     

共混比对丙烯酸酯橡胶/乙烯丙烯酸酯橡胶共混胶性能的影响

研究了共混比对丙烯酸酯橡胶(ACM)/乙烯丙烯酸酯橡胶(AEM)共混胶硫化特性、物理机械性能、耐热老化性能、耐油性能、耐低温性能、热稳定性和动态力学性能的影响。结果表明,AEM用量的增加改善了ACM/AEM共混胶的加工安全性能、物理机械性能和热稳定性能,耐热老化性能变化不明显,耐低温性能稍有下降,ACM/AEM共混胶耐ASTM No 1标准油性能变好,耐IRM 903标准油性能变差;当ACM/AEM共混比为60/40时,共混胶的综合性能最佳,能够满足密封圈的性能要求。     

环氧型丙烯酸酯橡胶的硫化及补强研究

本文研究了硫化剂用量、硫化时间、硫化温度、硫化压力、炭黑种类及用量对环氧型丙烯酸酯橡胶硫化胶的力学性能等的影响,结果表明随硫化剂用量逐渐增大,橡胶的拉伸强度先增后减,断裂伸长率逐渐减小。最佳硫化条件为：硫化剂1.5份、一段硫化时间为20min、二段硫化时间为2h、硫化压力6.0MPa、硫化温度170℃。随补强剂用量逐渐增大,橡胶的拉伸强度先增后减,断裂伸长率逐渐减小。补强炭黑最佳种类为N330和用量为55份。     

丙烯酸酯橡胶/乙烯丙烯酸酯橡胶并用胶性能的研究

制备丙烯酸酯橡胶(ACM)/乙烯丙烯酸酯橡胶(AEM)并用胶,并对其性能进行研究。结果表明:ACM与AEM并用能够实现共硫化;与ACM相比,ACM/AEM并用胶的拉伸强度增大,耐热空气老化性能和耐低温性能得到改善,耐油性能有所下降。当ACM/AEM并用比为60/40、炭黑N550和N774用量分别为40份、1#硫化剂用量为1.5份时,ACM/AEM并用胶的物理性能最佳。     

含氟丙烯酸酯橡胶的合成及性能

以丙烯酸乙酯、丙烯酸丁酯、含氟丙烯酸酯为单体,采用半连续乳液聚合法合成了含氟丙烯酸酯橡胶(ACM),用傅里叶变换红外光谱表征了其微观结构,考察了含氟单体种类及用量对含氟ACM亲水性、玻璃化转变温度及硫化特性的影响,以及交联剂二乙烯基苯(DVB)用量对含氟ACM硫化胶拉伸性能的影响。结果表明,丙烯酸六氟丁酯或丙烯酸十二氟庚酯(简称G 05)的转化率均超过90%;随着含氟单体用量的增加,ACM乳液涂膜的接触角逐渐增大,当加入质量分数为5%的G 05时,涂膜变为疏水性表面;含氟ACM只有1个玻璃化转变温度,且随着含氟单体用量的增加而逐渐下降;含氟ACM的操作安全性高,在硫化初期具有良好的流动性能;当DVB质量分数为3%时,含氟ACM的拉伸强度达到11.2 MPa。     

顺丁橡胶对硅橡胶/丙烯酸酯橡胶并用胶的增容作用

采用偏光显微镜、差示扫描量热仪以及力学性能、热老化性能测试手段,研究了顺丁橡胶(BR)增容的甲基乙烯基硅橡胶(MVQ)/丙烯酸酯橡胶(ACM)共混体系的并用比(质量比)、硫化工艺参数以及BR的加入对并用胶力学性能、耐热老化性能和相容性的影响。结果表明,BR的加入改善了MVQ/ACM并用胶的力学性能和耐热老化性能,当白炭黑用量为30份、BR/MVQ/ACM的并用比为25/45/55时,并用胶的力学性能和耐热老化性能最好;最佳硫化工艺参数为70℃×10 MPa×30 min;加入BR可以改善MVQ/ACM并用胶的相容性,且使其玻璃化转变温度降低,耐低温性能提高。     

丙烯酸酯橡胶的研究与应用

采用丙烯酸酯类单体通过乳液聚合制备了丙烯酸酯橡胶（ＡＣＭ）。试验研究了ＡＣＭ硫化胶的性能。结果表明,ＡＣＭ引入—ＣＯＯＨ基团,用环氧树脂作硫化剂,可以实现高温快速硫化,且其硫化胶性能良好;增大带有柔性基团的单体（增塑剂）的比例,可以改善ＡＣＭ硫化胶的耐低温性;增大极性大的单体（丙烯腈）的比例,可以改善ＡＣＭ硫化胶的耐油性和耐热性。ＡＣＭ与氟橡胶（ＦＫＭ）并用初步研究结果显示,ＦＫＭ的用量在５０份以上时,并用硫化胶性能接近ＦＫＭ     

Electron-microscopic procedure for acrylic rubber

The electron-microscopic visualization of acrylic rubber dispersed in a heterogeneous structural resin composition consisting of a rubber-modified two-phase plastic comprising essentially a butyl acrylate rubber phase and an acrylonitrile–styrene copolymer phase, respectively, has been accomplished. This procedure consists of the following: The molded resin specimen is treated with hydrazine hydrate solution to produce the acrylic acid hydrazides. Allow the treated specimen to soak in osmium tetroxide solution. The acrylic rubber may be indirectly fixed and stained. Some micrographs of ultrathin sections of two or three resin compositions, cut by an ultramicrotome, are presented.     

丙烯酸酯橡胶的合成及性能研究

采用溶液聚合方法合成了丙烯酸酯橡胶(ACM),考察共聚单体丙烯酸甲酯(MA)对共聚反应和橡胶性能的影响。MA作为共聚单体加快了聚合反应速率,对聚合转化率影响不大;核磁共振(NMR)测试表明,共聚物组成与投料比接近;MA含量增加,ACM在高温条件下凝胶含量提高;MA共聚导致ACM热分解温度、最快分解速率温度提高,耐热性改善。     

双交联型丙烯酸酯橡胶性能研究

<正>丙烯酸酯橡胶(ACM)是由丙烯酸酯单体(如丙烯酸甲酯、丙烯酸乙酯、丙烯酸丁酯和丙烯酸-2-乙基己酯等)与功能化单体(丙烯腈、2-氯乙基乙烯基醚、丙烯酸或者马来酸酐等)进行自由基共聚而得到的一类特种橡胶。其主链为饱和碳链,侧基为极性     

Distribution of carbon black in natural rubber/acrylic rubber blends

Distributions of carbon black in 30/70% (w/w) natural rubber (NR)/acrylic rubber (ACM) blends were investigated as a function of the carbon black content and type using a dynamic mechanical thermal analysis (DMTA) technique. Two different types of carbon black (N220 and N330) were used, and 10–50 phr carbon black was compounded to the rubber blends. From the DMTA thermograms of various blends, the weight fractions of carbon black in the NR and ACM phases were calculated. Carbon black was unevenly distributed in the rubber blend. It preferred to migrate into the NR phase, regardless of the amount of carbon black that was used. By increasing the carbon black content, the weight fraction of carbon black in the NR phase decreased whereas that in the ACM phase increased. A change in the type of carbon black from N220 to N330 significantly decreased the weight fraction of carbon black in the NR phase, but it was not sufficiently strong to affect the tensile properties and hardness of the rubber blend. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102:248–256, 2006     

丙烯酸酯橡胶的混炼工艺试验

分别研究了用开炼机和密炼机对丙烯酸酯橡胶进行混炼的工艺。试验结果表明,开炼机和密炼机混炼的适宜批量分别为２２．７ｋｇ和５０￣５１ｄｍ＾３。并重点通过投料顺序对混炼操作及硫化胶物理性能的影响试验,制定出具有良好效果的混炼工艺方法。     

Property modification of chloroprene rubber by addition of ultra-fine acrylic rubber powder

Abstract

The role of ultra-fine pre-vulcanised acrylic rubber powder (ACMP) in properties of chloroprene rubber (CR) was studied. ACMP was incorporated into CR at various loadings and the properties of the ACMP filled CR were investigated. Owing to the high thermoplastic nature of the ACMP, better processability is obtained with increasing ACMP loading. Even though the presence of ACMP gives negative effect on cure rate and state of cure, both modulus and hardness of the vulcanisates increase continuously with increasing ACMP loading. The tensile strength is also improved with increasing ACMP loading up to 20 phr. Nevertheless, elasticity and abrasion resistance of the vulcanisates are impaired as the concentration of ACMP is increased. This is mainly attributed to the combination of dilution effect and reduced crosslink density. Since ACMP is fully saturated and highly polar, the incorporation of ACMP into CR gives rise to enhanced aging and oil resistance of the vulcanisates.     

丙烯酸酯橡胶的耐热性和耐油性

介绍了以丙烯酸酯橡胶为基础,含有季铵盐和硬脂酸钠两种硫化体系的橡胶A-1和A-2在ASTM№1、ASTM№3腐蚀性油介质中,在100℃-150℃高温老化条件下所发生的质量、体积溶胀、硬度、压缩永久变形及回弹性等性能变化。此外还详细介绍了利用扫描电子显微镜（SEM）对橡胶材料结构进行研究的结果。     

Cold crystallization behavior of poly(lactic acid) in its blend with acrylic rubber; the effect of acrylic rubber content

Understanding the crystallization process of polymer blends is of great importance for designing their process conditions, especially when the crystallization occurs during heating, so‐called cold crystallization. In this paper, the cold crystallization behavior of poly(lactic acid) (PLA) in its blends with acrylic rubber (ACM) was studied as a function of ACM content, using various techniques including differential scanning calorimetry, polarized optical microscopy and rheological methods. It was found that the addition of 10 wt% ? 20 wt% ACM to the PLA accelerated its cold crystallization. However, on using a greater amount of ACM up to 30%, the rate of crystallization was not further increased. In the ACM‐rich blends, the crystallizable PLA domains were distributed inside the amorphous ACM matrix and consequently confined crystallization occurred. The observed effects are discussed in terms of the interplay between chain mobility enhancement and the influence of phase boundaries. © 2017 Society of Chemical Industry