弹性体改性的新工艺

苏联轮胎工业科学研究院开发了物理改性胶乳和弹性体的新工艺,可使它们的综合性能发生明显变化,即可提高生胶和胶料的内聚强度,硫化胶的弹性强度性能,撕裂强度,耐温耐热性,降低滞后损失。对传统的顺丁、丁苯、溶聚丁苯、丁腈、天然胶都能改进综合性能,从而预计可提高     

改性膨润土对EPDM无卤阻燃胶料性能的影响

介绍了改性膨润土在三元乙丙橡胶（ＥＰＤＭ）无卤阻燃胶料中的应用,试验表明在ＥＰＤＭ无卤阻燃胶料中加入５￣１０份改性膨润土,不仅对硫化胶的力学性能有影响,而且对硫化胶的阻燃性能也有明显的作用,还降低了橡胶制品的成本。     

一种新型橡胶填料—改性膨润土

介绍了改性膨润土在基础胶天然橡胶 (NR)和丁苯橡胶 (SBR)及橡胶制品轮胎当中的应用 ,结果表明 :(1)在NR和SBR中加入 10份改性膨润土不影响硫化胶的力学性能 ;(2 )在轮胎中加入 5～10份改性膨润土不但不影响轮胎半成品的力学性能 ,而且提高了橡胶与帘线的粘接强度 ;(3)改性膨润土易与SBR相混合。     

啤酒罐排酒阀橡胶密封件的研制

不锈钢骨架经表面化学处理后，涂开姆洛克ＣＨ２５２粘合剂，可与天然胶／丁苯胶配制的胶料硫化成一体，制作出符合质量要求的啤酒罐排酒阀橡胶密封件。     

防焦剂YG—1的防焦性能探讨

探讨了新型防焦剂YG-1在天然胶、顺丁胶、丁苯胶的硫黄硫化体系,天然胶的低硫高促和无硫硫化体系中的防焦性能,并与常用防焦剂水杨酸作了对比。指出有机酸类防焦剂YG-1与同类型防焦剂水杨酸相比,在硫黄硫化体系中具有较强的防焦效果,而且价格便宜。     

近期国内丁苯橡胶、顺丁橡胶市场动态

<正>一、丁苯橡胶本周(4月19～23日)国内丁苯胶市场行情出现回调,由于受到天然胶行情下跌、终端买盘低迷的影响,市场价格开始回落并出现倒挂,天然胶现货价格跟随期货下跌,从而对丁苯胶行情形成压制,丁苯胶市场受下游低迷影响,本周未能延续上扬走     

乙丙橡胶改性聚苯乙烯

用橡胶接枝改性聚苯乙烯提高抗冲击性能的品种,通称抗冲聚苯乙烯,在聚苯乙烯类产品中占有一定的地位。常用接枝改性的橡胶有:天然胶、丁苯、顺丁、丁睛、异戍、乙丙等。我国生产的抗冲聚苯乙烯,多用丁苯胶改性,由于丁苯中含有相当数量的双键,致使改性产品耐气候性     

炭黑表面粗糙度对橡胶补强作用的影响

用大分子吸附（OT吸附及CTAB吸附）和低温氮吸附测定的试验炭黑和普通高结构中超耐磨炉黑的比表面积和表面粗糙度表明,试验炭黑的表面粗糙度比较大,其表面11—15A细孔内的表面积比普通产品高10m~2/g。通过拉伸电阻率的测定发现,在天然胶和顺丁胶中含试验炭黑的硫化胶电阻率最低点处的伸长率比较低,炭黑与橡胶之间的结合比较弱。这可以用炭黑表面细孔诱导硫化胶内“空洞”产生和扩展以及炭黑聚集的观点来解释,从而认为炭黑表面粗糙度对橡胶的补强作用有直接影响。这可能是含试验炭黑的轮胎胎面（顺丁胶与天然胶之比为70/30）在实际里程试验中耐磨性大大低于普通高结构中超耐磨炭黑的原因。试验中观察到,丁苯胶中炭黑粗糙度对拉伸电阻率的影响不同于天然胶和顺丁胶,这是丁苯胶松弛特性不同造成的。     

NBR/有机改性膨润土复合材料的结构和性能及其对PVC的增韧作用

研究NBR／有机改性膨润土复合材料的结构、性能及其对PVC的增韧作用。采用X射线衍射仪、透射电子显微镜和扫描电子显微镜观察复合材料的微观结构发现，NBR大分子可插层进入有机改性膨润土层间。有机改性膨润土填充NBR硫化胶的物理性能优于未改性膨润土填充胶，10份有机改性膨润土的补强效果可达到30份炭黑N330的水平。NBR／有机改性膨润土复合材料对PVC的增韧效果优于NBR，且能保持较高的拉伸强度和弯曲强度。     

五氯硫酚合成工艺探讨

一、前言五氯硫酚(简称PCTP),为天然胶、丁苯胶及丁腈胶的塑解剂,又是塑解剂AP的主体组份。在天然胶中使用可提高塑炼效率,缩短塑炼时间、降低能耗、有利提高经济效益,且可提高橡胶的耐疲性能,是橡胶行业中的重要助剂之一。它对硫化胶的物理机械性能无不良影响。     

改性膨润土在丁苯橡胶中的应用

改性膨润土吸附有机物后，晶胞中的部分基团发生了变化，但蒙脱石的晶胞形状没有改变。随着丁苯橡胶中改性膨润土粒径的减小，丁苯橡胶硫化胶的拉伸强度、扯断伸长率、３００％定伸应力、撕裂强度都有所增加，硬度下降。其填充效果比碳酸钙的效果好。     

纳米有机膨润土/丁苯橡胶复合改性沥青的制备及性能

以纳米有机膨润土和丁苯橡胶(SBR)制备复合改性沥青,并考察了复合改性沥青的针入度、软化点、延度、储存稳定性及流变性能,同时对比了液体SBR和粉末SBR对复合改性沥青性能的影响.结果表明,复合改性沥青中,纳米有机膨润土的最佳质量分数为4％.随着SBR用量的增加,沥青的针入度降低,软化点升高,延度先增大后减小.粉末SBR...     

偶联剂改性对磁敏NR/SBR并用胶性能的影响

将NR和SBR与改性羰基铁粉机械共混制备磁敏NR/SBR并用胶,研究偶联剂KH-550,KH-560,KH-570和NDZ-401改性羰基铁粉对磁敏NR/SBR并用胶的物理性能和磁流变效应的影响。结果表明:不同偶联剂改性的羰基铁粉对NR/SBR并用胶性能有一定的影响;采用偶联剂KH-570改性的羰基铁粉填充的NR/SBR并用胶表现出较好的物理性能和磁流变效应。     

纳米碳酸钙在NR/BR/SBR并用胶中的应用研究

采用带有酚醛基的反应性有机改性剂对纳米碳酸钙CCR进行改性制得M-CCR,并制备了NR/BR/SBR/CCR和NR/BR/SBR/M-CCR复合材料,研究了两种复合材料的微观形态以及力学性能和加工性能。结果表明,M-CCR在并用胶中的分散性优于CCR,对并用胶力学性能的提高更显著;两种填料都能改善并用胶的加工性能,并且不影响并用胶的抗湿滑性和滚动阻力。     

Synthesis and characterization of cationic gemini surfactant modified Na–bentonite and its applications for rubber nanocomposites

A cationic gemini surfactant (N‐isopropyl‐N , N‐dimethyldodecan 1‐aminium bromide) was synthesized by quaternization reaction. The synthesized surfactant was characterized by Fourier transform infrared (FTIR) and proton nuclear magnetic resonance (1H NMR) spectroscopy. Modified Na–bentonite (organoclay) was obtained by the intercalation of a gemini surfactant between the layers of sodium bentonite and characterized by X‐ray diffraction (XRD), transmission electron microscopy (TEM), FTIR, thermogravimetry–differential thermal analysis (TGA–DTA) and differential scanning calorimetry (DSC) techniques. The results of XRD, TEM, FTIR, TGA, and corresponding DSC analysis indicate that gemini surfactant has been successfully intercalated into the clay layers. Rubber‐based nanocomposites have been prepared by incorporating various concentration of organically modified bentonite on to natural rubber/styrene–butadiene rubber (NR/SBR) rubber blend (75/25) using two roll mill. Effect of organoclay content on XRD, curing, mechanical, and scanning electron microscopy (SEM) properties of the nanocomposites are investigated. The morphological study showed the intercalation of nanoclay in NR/SBR blend chain. It was found that the organoclay decrease the optimum and scorch time of the curing reaction, increase maximum torque and the curing rate, which was attributed to the further intercalation during vulcanization process. Mechanical properties such as tensile strength, modulus and elongation at break have improved. POLYM. COMPOS., 38:396–403, 2017. © 2015 Society of Plastics Engineers     

Effects of modified silica on the co-vulcanization kinetics and mechanical performances of natural rubber/styrene–butadiene rubber blends

Rubber blends are widely used for combining the advantages of each rubber component. However, to date, how to determine and distinguish the vulcanization kinetics for each single rubber phase in rubber blends during the co-vulcanization process is still a challenge. Herein, high-resolution pyrolysis gas chromatography–mass spectrometry (HR PyGC-MS) was employed for the first time to investigate the vulcanization kinetics of natural rubber (NR) and styrene–butadiene rubber (SBR) in NR/SBR blends filled with modified silica (SiO₂). The reaction rates of crosslinking of each rubber phase in NR/SBR were calculated, which showed that the crosslinking rates of NR were much lower than those of SBR phase in the unfilled blends and blends filled with unmodified and silane modified silica. Interestingly, the vulcanization rates of NR and SBR phase were approximately same in the vulcanization accelerator modified silica filled blends, showing better co-vulcanization. In addition, the vulcanization accelerator modified silica was uniformly dispersed and endowed rubber blends with higher mechanical strength compared to the untreated silica. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137, 48838.     

Synthesis and characterization of styrene butadiene rubber—Bentonite clay nanocomposites

In the present study, naturally occurring unfractionated bentonite clay was used to prepare styrene butadiene rubber/bentonite clay nanocomposite by latex stage blending. The bentonite clay was organo‐modified by in situ resol formation by the reaction of resorcinol and formaldehyde. The latex clay mixture was co‐coagulated with acid. The resulting clay masterbatch was compounded and evaluated by Fourier Transform Infrared spectroscopy, X‐ray diffraction (XRD), Transmission Electron Microscopy (TEM), Energy Dispersive X‐ray spectroscopy (EDS), Scanning Electron Microscopy, Thermogravimetric analysis, and Differential Scanning Calorimetry. XRD showed that the interplanar distance of the in situ resol‐modified bentonite clay increased from 1.23 to 1.41 nm for the unmodified bentonite. TEM analysis indicated partial exfoliation and/or intercalation. EDS (Si and Al mapping) of the clay revealed the nature of the dispersion in the nanocomposites vis‐à‐vis the conventional styrene‐butadiene rubber (SBR)/bentonite clay composite. Thermogravimetric analysis was used to compare the decomposition trends of the SBR/clay nanocomposites with the SBR/clay composite. The glass transition temperature of SBR/clay nanocomposites increased as compared with that of neat SBR. Substantial improvement in most of the other mechanical properties was also observed in case of the nanocomposites. POLYM. ENG. SCI., 2009. © 2009 Society of Plastics Engineers     

Silica‐modified SBR/BR blends

The purpose of this article is that the silica‐modified SBR/BR blend replaces natural rubber (NR) in some application fields. The styrene‐butadiene rubber (SBR) and cis‐butadiene rubber (BR) blend was modified, in which silica filler was treated with the r‐Aminopropyltriethoxysilane (KH‐550) as a coupling agent, to improve mechanical and thermal properties, and compatibilities. The optimum formula and cure condition were determined by testing the properties of SBR/BR blend. The properties of NR and the silica‐modified SBR/BR blend were compared. The results show that the optimum formulawas 80/20 SBR/BR, 2.5 phr dicumyl peroxide (DCP), 45 phr silica and 2.5 mL KH‐550. The best cure condition was at 150°C for 25 min under 10 MPa. The mechanical and thermal properties of SBR/BR blend were obviously modified, in which the silica filler treated with KH‐550. The compatibility of SBR/BR blend with DCP was better than those with benzoyl peroxide (BPO) and DCP/BPO. The crosslinking bonds between modified silica and rubbers were proved by Fourier transform infrared analysis, and the compatibility of SBR and BR was proved by polarized light microscopy (PLM) analysis. The silica‐modified SBR/BR blend can substitute for NR in the specific application fields. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011.     

有机蒙脱土对天然橡胶/丁苯橡胶的补强及增容作用

采用机械混炼法制备了天然橡胶(NR)/丁苯橡胶(SBR)/有机蒙脱土(OMMT)纳米复合材料,采用TEM和XRD对复合材料的亚微观结构进行了表征,并对复合材料的表观交联密度、静态力学性能、动态力学性能和硫化热效应进行了研究。结果表明,复合材料为剥离型纳米复合材料;OMMT能够明显提高纳米复合材料的交联密度和静态力学性能;OMMT导致NR/SBR共混胶动态损耗因子降低,并且能够促使NR和SBR玻璃化转变温度更为接近,起到了增容作用;OMMT实现了NR和SBR两相的同步硫化。     

复合氧化锌胶料的性能研究

试验研究复合氧化锌对NR和SBR胶料及斜交轮胎胎侧胶和胎面基部胶性能的影响.结果表明,当氧化锌用量超过2.5份后,采用复合氧化锌的NR或SBR胶料硫化特性、物理性能和耐热老化性能与采用间接法氧化锌的胶料接近;采用复合氧化锌等量替代间接法氧化锌用于斜交轮胎,胎侧胶性能变化不大,胎面基部胶物理性能有所提高,胶料成本降低.