环氧化天然橡胶的研究及应用进展

环氧化天然橡胶(ENR)具有良好的耐油性、气密性和粘着性,同时还具备一些特殊性能,是一种具有广阔应用前景的橡胶材料。本文介绍了近年环氧化天然橡胶的制备、结构、性能、改性和应用的研究工作,并对其研究趋势进行了展望。     

环氧化天然橡胶——一种低透气性、高强度天然橡胶材料

环氧化天然橡胶(ENR)是一种新的聚合物,它具有许多独特的性质,如良好的耐油性,低透气性,改进了的湿抓着力和抗滚动阻力性能。这些性能中的某些性能与合成橡胶比较相似,而与天然橡胶不同。环氧化天然橡胶可     

环氧化天然橡胶的研究与应用

环氧化天然橡胶（ENR）是由NR化学改性而成,笔者阐述了环氧化天然橡胶制备原理和方法、环氧化天然橡胶性能及应用研究、环氧化天然橡胶共混改性研究,其中包括ENR与PVC共混体系的研究、ENR其它共混体系的研究和ENR改性的研究.     

环氧化天然橡胶的特性与应用

环氧化天然橡胶 (ENR)是由天然胶乳与过氧化氢 /乙酸反应制得的一种聚合物。它在保留天然橡胶 (NR)多种优异性能的基础上 ,其气密性、耐油性、粘着性均有很大提高 ,同时还具有良好的抗湿滑性和较低的滚动阻力 ,是有着广泛应用前景。本文主要介绍 ENR的特性与应用。一、天然胶乳的环氧化早期的研究首先尝试在均相溶液 (苯、氯仿 )中进行溶液环氧化 ,采用过苯甲酸类(邻单过苯二甲酸、过苯甲酸、卤化过苯甲酸 )和过乙酸等作为环氧化试剂 ,小心控制可获得高的环氧化度。由于工业化的要求 ,胶乳中直接环氧化引起人们的更大兴趣 ,显然 ,它比有…     

反式异戊橡胶的环氧化改性研究进展

非极性橡胶的环氧化改性,可以提高材料极性,增加其应用范围。目前对天然橡胶的环氧化反应研究很多。本文主要对与天然橡胶化学组成相同、构型不同的反式-1,4-聚异戊二烯橡胶环氧化改性反应的国内外进展进行了介绍。     

白炭黑在环氧化天然橡胶中的应用

摘要：研究在不使用任何偶联剂的条件下,白炭黑在环氧化天然橡胶（ENR）中的应用。白炭黑在天然橡胶（NR）中会发生明显的团聚,而在ENR中的团聚情况可得到明显改善,且ENR的环氧化程度越高,白炭黑的分散性越好。ENR白炭黑胶料表现出良好的抗湿滑性能和较低的滚动阻力,白炭黑用量大T20份时,ENR/白炭黑胶料的压缩生热明显低于NR／炭黑胶料。     

环氧化天然橡胶的基本性能

本文综述了环氧化天然橡胶的制法、结构、配合与加工及硫化胶的基本性能,分析了由环氧化天然橡胶的特殊性能带来的应用前景。     

天然橡胶的研究与发展

论述了关于天然橡胶的研究与发展中的一些重要方面,介绍了一种具有良好耐油性能和优越耐热性的从天然橡胶衍生出的新型高性能材料－－热塑性环氧化天然橡胶（ＴＰＥＮＲ）,简要介绍了环氧化天然橡胶（ＥＮＲ）和热塑性天然橡胶（ＴＰＮＲ）的发展概况以及别外一种可能有用的天然橡胶品种－－液体天然橡胶（ＬＮＲ）,阐述在ＮＲ／ＮＢＲ和ＮＲ／ＥＰＤＭ并用体系中,控制交联分布的新技术对橡胶性能所产生的影响,列举这些并用体系     

环氧化天然橡胶

ｅｐｏｘｉｄｉｚｅｄｎａｔｕｒａｌｒｕｂｂｅｒ；ＥＮＲ　用过氧化有机酸或过氧化氢与有机酸处理，使天然橡胶形成环氧化基团结构的生胶。该胶具有抗湿滑性好、气密性优良、耐油性能佳等诸多优点。按环氧化程度的高低一般有ＥＮＲ７５，ＥＮＲ５０和ＥＮＲ２５三个品种。环氧化天然橡胶     

利用玻璃化温度梯度制备天然橡胶类高阻尼弹性体材料

利用天然橡胶(NR)与环氧化天然橡胶(ENR)良好的相容性,以及不同环氧化程度的ENR的玻璃化温度(T_g)梯度差异,选用NR和3种不同环氧化程度的ENR(ENR-25,环氧化程度为25%;ERN-40,环氧化程度为40%;ENR-50,环氧化程度为50%)制得NR/ENR-25/ENR-40/ENR-50四元并用阻尼材料,研究由于NR和各ENR的T_g和用量差异产生的阻尼加和效应对并用胶在室温及以上温度的阻尼温域的拓宽情况。结果表明,当NR/ENR-25/ENR-40/ENR-50并用比为55/5/15/25,同时添加40份炭黑N330时,四元并用胶具有较好的综合性能,其有效阻尼温域(损耗因子大于0.3)为66℃(-15.3～50.7℃),拉伸强度可达17.2 MPa,拉断伸长率为571%。     

Use of epoxidized natural rubber as a toughening agent in plastics

At present, the rubber toughening of plastics has become an attractive field of study in polymer science and technology because brittleness is known to be a drawback in many engineering plastics; it can cause premature failure during application. Among existing rubber materials, epoxidized natural rubber (ENR) has been widely used as an impact modifier or toughening agent in a large number of engineering plastics; in particular, it enhances the impact strength, which deteriorates with the incorporation of other additives, such as fillers and flame retardants. ENR is a modification product from natural rubber produced via an epoxidation reaction. ENR also has good chemical resistance. In this review, we aim to provide a concise current status in the field of ENR toughening agents for plastics with a brief discussion of their associated problems and potential applications. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 42270.     

环氧化天然橡胶的中型试验和产品应用

本研究是利用天然鲜胶乳扩大试制环氧化天然橡胶（ＥＮＲ），并研究了其透气性、耐油性、比重、玻璃化温度与环氧化程度的关系，以及纯胶配合、炭黑配合硫化胶的主要物理性能。对ＥＮＲ胶乳在玻璃纤维布和尼龙帘布表面浸胶处理．干胶在自行车和摩托车内胎、印刷胶辊等制品方面的应用进行了尝试。     

Controlled degradation of natural rubber and modification of the obtained telechelic oligoisoprenes: Preliminary study of their potentiality as polyurethane foam precursors

Telechelic oligoisoprenes were successfully prepared by the selective controlled degradation of natural rubber, a renewable source, via epoxidation and cleavage reactions. The molar mass of the oligoisoprene product obtained depends on the degree of epoxidation of the starting materials. The chemically modified structures obtained via epoxidation, hydrogenation, and ring opening of epoxide groups were also studied, and the chemical structures and thermal properties of the oligoisoprene products were determined. Moreover, the preliminary study of preparation of hydroxytelechelic natural rubber (HTNR)‐based polyurethane foam was performed. A novel HTNR‐based polyurethane foam was successfully prepared and its thermal properties were investigated and the results indicated that the HTNR‐based polyurethane foam has a good low temperature flexibility. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

Epoxidation of natural rubber latices: Methods of preparation and properties of modified rubbers

Studies in the epoxidation of natural rubber latices are described. Investigated epoxidation routes include the use of bromohydrin intermediates, hydrogen-peroxide-catalyzed systems, and preformed peracetic acid. The latter reagent allows almost quantitative epoxidation of natural rubber up to high modification levels with no detectable side reactions. Kinetic studies show that the peracetic acid epoxidation is second order in peracid and rubber hydrocarbon with an overall activation energy of 56.2 kJ/mol. Epoxidation leads to a progressive increase in T_g and polymer density with increase in modification level. The effect of modification on solvent swelling and mechanical properties of the DICUP-crosslinked rubbers are reported.     

生物质橡胶抗撕裂剂应用性能研究

含天然生物质的橡胶抗撕裂剂组合物及其制备方法和应用。生物质抗撕裂剂组合物是一种反应性助剂,与硫化剂一起使用,可与天然橡胶及合成橡胶等固体橡胶共交联,对环境及人体污染的缺点。含生物质抗撕裂剂组合物制得的胎面胶,胶料混合过程的能耗低,挤出物尺寸稳定性好,挤出和压延胶料表面质量好,与常用的胎面胶组合物相比,在确保加工性能的前提下胎面胶物理机械性能好,抗撕裂性高,耐切割性高,可以提高轮胎的耐久性、延长轮胎寿命。     

废白土在天然橡胶中的应用性能

研究了废白土做填充剂及软化剂在天然橡胶中的应用,并与同份数的陶土（同时添加3份芳烃油）进行性能对比。结果表明：废白土可以作为填充剂和软化剂应用于天然橡胶中,且以废白土为填料的胶料流动性、焦烧性、扯断永久变形性能好、耐磨耗性能、冲击弹性、伸长率、耐老化性能均好。     

Surface modification of natural rubber laces

Epoxidation has been applied to modify the surface of natural rubber laces. When very thin laces of fractionated bleached rubber are used, about 6% of the double bonds could be modified. Using ¹H nuclear magnetic resonance (NMR) and infrared (IR) analysis the best condition for the reaction was worked out. Both ¹³C NMR and differential scanning calorimetry (DSC) results indicate that the 6% epoxide groups are placed in a predominantly block manner. Modification in yellow fraction rubber however gives lower epoxy contents. Increase in glass transition tempreature by epoxidation results in more damping and better abrasion resistance. The resultant polymer acts very similar to a 90/10 natural rubber/50% epoxidized natural rubber (NR/ENR-50) blend.     

国产脱蛋白天然橡胶的性能及应用

研究国产脱蛋白天然橡胶（DPNR）的性能及其在减震橡胶制品中的应用。结果表明：与普通天然橡胶（NR）相比,DPNR的氮含量较小,压缩生热较低,压缩永久变形较小,弹性和电绝缘性能较好,拉伸强度和拉断伸长率略低,耐老化性能稍差;用国产DPNR为主体材料试制的机车弹性旁承的强化疲劳性能、尺寸稳定性和弹性好,压缩永久变形小。