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。     

环保促进剂用量对丙烯酸酯橡胶/乙烯丙烯酸酯橡胶共混胶性能的影响

采用环保促进剂Vulcofac ACT 55与硫化剂Diak No 1组成硫化体系,研究了Vulcofac ACT 55用量对丙烯酸酯橡胶/乙烯丙烯酸酯橡胶共混胶性能的影响。结果表明,随着Vulcofac ACT 55用量的增加,共混胶的交联密度先增大后减小,焦烧时间逐渐缩短,硫化反应速率则逐渐增大;共混硫化胶的物理机械性能、耐热老化性能、耐ASTM No 1标准油性能和热稳定性先得到改善后又变差。差示扫描量热研究结果显示,Vulcofac ACT 55用量为2份(质量,下同)时共混硫化胶的耐IRM 903标准油性能最差、玻璃化转变温度最高。动态热机械分析结果显示,Vulcofac ACT 55用量超过2份后共混硫化胶的玻璃化转变温度逐渐降低,而用量不同共混硫化胶处于高弹态时的储能模量相近。     

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     

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。     

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。     

ACM/FKM并用胶的性能研究

研究了不同并用比的氟橡胶（FKM）和丙烯酸酯橡胶（ACM）并用胶的硫变特性、物理机械性能、耐老化性、热稳定性和压缩永久变形性能。实验结果表明：ACM与FKM可以很好地混合并且各自交联,从而制备综合性能优异的并用胶;并用比为30/70的ACM/FKM并用胶综合性能较佳,二段硫化后其物理机械性能和压缩永久变形性能明显改善,且耐热空气老化性能优异;热重分析结果表明,并用胶有很好的热稳定性。     

聚丙烯酸酯橡胶Nipol AR12的性能及应用

探讨聚丙烯酸酯橡胶(ACM)Nipol AR12的性能及其在发动机O形密封圈和骨架油封中的应用。结果表明，采用适当配合，Nipol AR12的高温(175℃)压缩永久变形与氟橡胶相当，明显小于其它牌号的ACM．以Nipol AR12为主体材料，硫化体系采用胺类硫化剂ZSHB／胍类促进剂ZSHA体系、防老剂采用防老剂445并加入适量脱模剂935P制得的O形密封圈和骨架油封尺寸稳定性和密封性能好。     

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     

高强度高伸长率丙烯酸酯橡胶的合成研究

以丙烯酸乙酯(EA)、丙烯酸甲酯(MA)、丙烯腈(ACN)为单体,通过乳液聚合,制备高强度高伸长率综合性能优良的丙烯酸酯橡胶(ACM).研究了单体的配方及聚合方法.结果表明:当EA∶ MA∶ ACN配比为90∶ 8∶2时,采用本研究所描述的聚合方法可得到物理及机械性能优良的丙烯酸酯橡胶,扯断强度由原来的12 MPa提高到15 MPa以上,伸长率由原来的220％提高到250％以上.     

丙烯酸酯橡胶的生产、应用与市场

一、性能与组成丙烯酸酯橡胶简称ACM,是以丙烯酸酯为主单体经共聚而得的弹性体,其主链为饱和碳链,侧基为极性酯基。特殊的结构赋予其许多优异的特点,如耐热、耐老化、耐油、耐臭氧、抗紫外线等性能,力学性能和加工性能优于氟橡胶和硅橡胶;其耐热氧老化性和耐油性优于丁腈橡胶。被广泛应用于各种高温、耐油环境中,成为近年来汽车工业着重开发推广的一种密封材料,目前国内需求几乎全部依赖进口。     

化学接枝法制备腻子型吸水膨胀橡胶研究

吸水膨胀橡胶是一种新型的功能高分子材料,过去多用机械共混的方法制备,但是这种方法存在着反复使用性能差的缺点,针对这个问题,本实验采用过硫酸铵/硫代硫酸钠氧化还原引发体系,有效地使丙烯酸钠单体与天然胶乳接枝共聚,制备出吸水倍率相当高的腻子型吸水膨胀天然橡胶。实验结果表明:反应温度、引发剂用量对吸水倍率和接枝率有明显的影响,单体用量对吸水倍率影响较大;反复吸水能力基本保持不变。     

Dynamic mechanical properties of acrylic rubber blended with phenolic resin

The dynamic mechanical properties of blends of phenolic resin (PF) and acrylic rubber (ACM) were investigated. PF had good compatibility with ACM and played an important role in the damping of the ACM/PF blends. With the increase of PF content and molecular weight, the peak of loss factor (tan δ) of blends shifted to a higher temperature and became much wider, indicating the convenience to adjust the value of tan δ peak and the temperature range. Fourier Transform infrared spectroscopy detected that the intermolecular hydrogen bonding between the PF hydroxyl groups and the ACM carbonyl groups had made a great contribution to the improvement of damping. Compared with the organic small molecule used in our previous study, PF gifted the blends with equivalent damping performance and much better stability and a lower cost for the application of damping materials. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

改性接枝白炭黑填充丙烯酸酯橡胶的性能研究

主要探讨了甲基丙烯酸缩水甘油酯(GMA)接枝改性的白炭黑与橡胶的作用机理及在橡胶基体中的分散性。研究了不同种类和不同用量的白炭黑对丙烯酸酯橡胶(ACM)力学性能的影响。实验结果表明:接枝GMA的白炭黑在橡胶基体中具有较好的分散性,接枝改性的白炭黑与橡胶基体具有很好的相容性,接枝GMA的白炭黑填充的ACM力学性能较好;在白炭黑质量分数为40%时,拉伸强度达到最大值10.2MPa,而断裂伸长率在白炭黑质量分数为50%时,达到最大值345%。     

低脆性温度丙烯酸酯橡胶的制备与性能

以氯代乙酸乙烯酯为硫化点单体、二乙二醇单甲醚丙烯酸酯为第3单体,与丙烯酸丁酯和丙烯酸乙酯乳液共聚合成了丙烯酸酯共聚物,经混炼、硫化制得超耐寒丙烯酸酯橡胶,并分别对硫化胶的力学性能和热学性能进行了表征.结果表明,所得丙烯酸酯橡胶的拉伸强度达10 MPa,撕裂强度达23 kN/m,扯断伸长率300%左右,脆性温度低于-32...     

In situ preparation of reduced graphene oxide reinforced acrylic rubber by self-assembly

Reduced graphene oxide reinforced acrylic rubber (ACM/RGO) was in situ prepared via self-assembly method in the presence of hydrazine hydrate as reducing agent. X-ray diffraction and X-ray photoelectron spectroscopy confirmed the chemical structure of ACM/RGO, and transmission electron microscope and scanning electron microscope demonstrated that RGO was uniformly dispersed in ACM matrix. Due to the barrier role of RGO sheets, the resistances to heat and water of ACM/RGO were obviously improved. Furthermore, the mechanical properties were also largely affected by the incorporation of RGO. With 2 parts per hundred rubber of RGO, the tensile strength and Shore A hardness of ACM/RGO reached 18.8 MPa and 73, and the elongation at break maintained at 236%. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47187.     

Development of a new procedure for lipid extraction from Hevea brasiliensis natural rubber

Non‐isoprene components and especially lipids have been reported to be involved in some key properties of natural rubber. Unfortunately, these results are hardly comparable due to different extraction methods. This work aimed to optimize lipid extraction from natural rubber either in the liquid state (latex) or in the dry state (unsmoked sheets). Extraction of unsmoked sheets from the RRIM 600 clone was carried out with different combinations of organic solvents (chloroform/methanol and hexane/isopropanol mixes). Chloroform/methanol (2 : 1 vol/vol) was found to be the most suitable for lipid extraction from unsmoked sheet rubber. The lipid extraction yield was improved by increasing the exchange surfaces by grinding rubber under liquid nitrogen and extracting the ground rubber for 6 h at room temperature, leading to 1.82% lipid extraction yield (versus dry rubber). Concerning latex extraction, the problem of lipid entrapment in the coagulum from immediate coagulation of latex in the solvent was solved by preliminary two times dilution of latex, giving a 3.24% extract (versus dry rubber) containing a minimum quantity of contaminating polyisoprene. Concerning the nature of lipids, dilution increased mainly neutral lipid extraction, which may suggest that neutral lipids were those entrapped by coagulation.