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1.
采用热重-差示扫描量热-质谱(TG-DSC-MS)联用技术研究了汽车废旧轮胎在氩气气氛中的热解特性及热解气种类.结果表明,废旧轮胎在热解过程中存在一个不明显失重阶段(200~300℃)和2个明显失重阶段,分别为油类添加剂析出过程和天然橡胶热解(300~400℃)、合成橡胶热解(400~550℃)过程.随升温速率增大,轮胎起始热解温度升高,热解区间向高温方向移动,最大热解速率增加.热解过程中共检测到H_2,H_2O,CO,CO_2,CH_4,C_2H_2,C_2H_6七种热解气,其中H_2O与CO存在2个析出峰,CO_2存在3个析出峰,CO析出量最高.采用Ozawa峰值法与Ozawa等转化率法得到轮胎天然橡胶热解阶段的活化能介于55~60k J/mol之间,而合成橡胶热解阶段的活化能介于110~115 k J/mol之间.  相似文献   

2.
专利介绍     
《橡胶科技市场》2013,(11):47-48
矿山用巨型工程机械子午线轮胎胎面橡胶组合物 本发明涉及一种矿山用巨型工程机械子午线轮胎胎面橡胶组合物。该橡胶组合物有利于改善轮胎的抗割裂、抗掉块性能。该橡胶组合物配方为:天然橡胶或者含有天然橡胶和丁苯橡胶的并用体系,100;补强炭黑和高分散性白炭黑并用体系,(15~60)/(8~25)//或者补强炭黑和高分散性白炭黑并用体系,(20~65)/(10~20);  相似文献   

3.
采用激光粒度仪测定氧化铜粉体试样的粒度分布,利用透射电镜(TEM)观察表征其形貌。在含氢25%的氢氮混合气流中,在不同的升温速率(2.5、5、10、12.5、17.5、25K/min)下,利用微机差热天平进行非等温的热重分析实验,测定样品的TG—DTA曲线。研究结果表明,氧化铜粉体样品结构不规则,粒径分布较宽,粒径约为9.4gm:TG曲线的起始反应温度和DTA曲线的峰值温度均随着升温速率的增大而增大;氢气还原氧化铜粉体为单质铜的表观活化能为59.42kJ/mol,指前因子为6.75×10^5min-1,反应级数为1.08。  相似文献   

4.
以棉花秸秆(棉秆)为原料,研究了不同温度下添加无水氯化钙对热解产物棉秆炭理化特性的影响。通过同步热分析(TG/DSC)、X射线衍射(XRD)、拉曼光谱(Raman)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和N2吸附-脱附分析表征了其微观形貌和结构。TG分析显示热解温度达到500 ℃后,样品失重较少,故选择550~750 ℃为热解温度范围;试验结果表明直接热解和氯化钙活化这两种热解法制备的样品均是无定形炭结构,在550~750 ℃时,直接热解法制备的样品拉曼分析参数ID/IG约为0.93,最大比表面积2.09 m2/g,最大平均孔径为7.21 nm,氯化钙活化法制备样品ID/IG约为0.85,最大比表面积487.68 m2/g,最大平均孔径为5.97 nm。活化法制备的样品在石墨化程度、比表面积大小、孔径数量等方面优于直接热解法制得的样品,而直接热解法制得的样品孔径较大、无序化程度高、稳定性较好。  相似文献   

5.
废旧轮胎作为对环境有害的固体废弃物,其组成包括炭黑、白炭黑和胶粉等多种有价值的资源。在现有回收技术中,废轮胎热裂解技术可有效回收裂解油、炭黑和钢丝等,在国内获得了广泛应用。相对于已经普遍利用的热解油和钢丝来说,热解炭黑含有质量分数14-21%的灰分和胶质层,它的高价值利用是实现废旧轮胎循环回用的关键。很多研究者开展了热解炭黑不同的改性处理工艺研究,改性后的热解炭黑可被应用于多个领域。该文主要概括了热解改性炭黑在橡胶生产中的补强作用、改性活性炭吸附剂、电池材料、以及沥青和油墨填料等方面的应用,综述了上述应用领域内热解炭黑的处理和改性方法,并指出今后热解炭黑高价值回用的方向和改性方法。  相似文献   

6.
橡胶行业节能减排的目标:(1)争取在3~5年内构建完成促进我国废旧轮胎回收利用的政策法律体系,规范建立废旧轮胎回收处理体系和监督管理制度;(2)轮胎翻新率由4.5%提高到8%~10%,翻新轮胎总产量为1800万~2000万条;(3)废旧橡胶综合利用率由65%提高到80%,胶粉和再生胶产量达到330万t,  相似文献   

7.
随着汽车业的快速发展,汽车废旧轮胎的回收及二次利用显得尤为重要。采用TG-DTG技术研究废旧轮胎的裂解行为,对卡车外轮胎、卡车内胎和自行车外胎等废旧轮胎微观尺度下的裂解行为进行分析。结果表明,轮胎裂解过程可分为三个阶段:第一阶段约200℃开始,是一个缓慢失重的过程,主要是少量水分、轮胎制作过程中加入的增塑剂及其他有机助剂受热析出所致;第二阶段为天然橡胶的热分解;第三阶段是合成橡胶的热分解。对于卡车外轮胎样品,第二峰和第三峰是主要失重峰,对于卡车内胎和自行车外胎样品,第二峰是主要失重峰。建立了废旧轮胎裂解动力学模型:lndα/dT/1-α=lnA/β-Ea/RT。通过对相关数据进行处理,得到废旧轮胎裂解动力学参数中的反应活化能Ea与频率因子A,证明此方法的实用性。  相似文献   

8.
陈波宇  顾瑛  陈生  王丹灵  白浩 《轮胎工业》2021,41(6):0395-0398
研究热重(TG)分析法测定橡胶并用比。通过对天然橡胶(NR)、顺丁橡胶(BR)和不同种类丁苯橡胶(SBR)进行TG分析,得到不同样品用量NR、不同种类SBR以及BR和SBR与NR不同并用比并用胶的TG分析曲线,提出面积法计算NR/SBR和NR/BR并用胶并用比的方法。结果表明该方法得到的并用胶并用比在两种橡胶用量接近时具有很高的准确性,随着两种橡胶用量差的增大准确性有所下降。  相似文献   

9.
为研究不同热解气氛对油漆稀料与聚对苯二甲酸乙二醇酯(PET)共热解特性的变化规律,采用同步热分析仪,根据预实验结果,测定在升温速率为10 ℃/min时,不同热解气氛(空气和氮气)条件下油漆稀料和PET塑料共热解过程中失重(TG)、焓变(DSC)的变化,并采用Coats?Redfern法对样品进行热动力学分析。结果表明,样品在氮气气氛下的热解过程存在明显的滞后现象,质量损失率为82.2 %;在空气气氛中更有利于油漆稀料和PET塑料的共热解反应中间产物的检出;PET塑料及其燃烧残留物在空气中的平均活化能均小于氮气中的值,但混合物在空气中400~475 ℃温度间活化能更低;500 ℃后混合物达到二次燃烧条件。  相似文献   

10.
结合目前废旧轮胎资源化处理现状及研究成果,本文对热解机理、热解技术进行分析、对比,着重介绍了热解温度、升温速率、物料粒径、催化剂等工艺参数对热解产物产率的影响,分析表明Coast-Redfern积分法所得动力学模型较准确,平均反应活化能为129.5kJ/mol;现有的研究表明,热解温度对产物产率影响最大,气相产物与液相产物产率随温度升高而增加,其中液相产物产率相对较高的热解温度在500~550℃范围内,固相产物品质较高的热解温度在500~650℃范围内。其次对其固、液、气三相产物特性及应用和污染物(S、PAHs)的分布与控制方法做了归纳总结,为废旧轮胎热解技术向工业化发展提供技术依据。  相似文献   

11.
This paper investigates the use of thermogravimetric analysis to study the kinetics of thermal degradation of ground tire rubber (GTR) obtained from reclaimed tires. We analyzed the composition of GTR and determined the content percentage of its components (volatile compounds, rubber, and ash) using thermogravimetric analysis (TGA). T 1 and T 2 temperature peaks corresponding to the maximum normalized weight loss rate (NWLR) of the two main rubber components of tires NR (natural rubber) and a BR/SBR (butadiene/styrene-butadiene rubber blend) using the Gaussian deconvolution method has been determined. The influence of GTR particle size and heating rate on reaction rates (dx/dt) and on degradation time during the degradation process has been analyzed.  相似文献   

12.
李铁贵 《弹性体》2006,16(1):56-58
研究了莱茵新Rhenosin TT100时NR/BR/SBR胎面胶硫化特性、物理机械性能和发黑与其它配合剂在肢料中的分散性以度耐磨性能的影响。结果表明,谈助剂加入NR/BR/SBR配方中可以明显改善炭黑等配合剂在胶料中的分散性,提高挤出胎面肢断面的致密性,提高了撕裂性能、耐磨性。轮胎实际里程试验表明,采用2份Rhenosin TT100的胎冠肢的轮胎耐磨性优异。  相似文献   

13.
ABSTRACT

Understanding the cut and chip (CC) effect in rubber is important for successful product development for tires used in off-road or poor road conditions and for other demanding applications of rubber. This research describes a laboratory testing method for characterising the CC fracture behaviour of rubber using a device that controls and records multiple applied loads and displacements during cyclic impact to the surface of a solid rubber specimen to mimic and quantify the CC damage experienced by tire tread compounds. To study the capabilities of the instrument, three model compounds were studied that are based on carbon black reinforced compounds of common elastomers used in tire treads: natural rubber (NR), styrene-butadiene rubber (SBR), and butadiene rubber (BR). These polymers have well-established CC tendencies in field performance of tire treads, with NR exhibiting the best CC resistance followed by SBR and finally BR. The same trend was found with the rubber impact testing approach that allowed the CC behaviour to be quantified using a new physical parameter which is the CC propensity (P). The relative ranking for CC resistance for the three compounds followed the fatigue crack growth resistances of the materials but was exactly opposite to the ranking of DIN abrasion resistance. This provides evidence that CC damage from impact by mm-scale asperities and abrasion of rubber against μm-scale asperities exhibit distinct characteristics in rubber.  相似文献   

14.
研究了氮气氛下对取代度在0.79-2.50范围的羧甲基纤维素进行TG,DTG,DTA热分析和裂解活化能的计算。结果表明,对于取代度大于1的竣甲基纤维素,随着取代度增大,其主要裂解开始温度T;和主要裂解温度几升高,而主要裂解温度范围(T2-T1)变窄和在主要裂解温度范围内失重RT减少,因而其热稳定性有所提高。超高取代度的核甲基纤维素裂解活化能也较高。按甲基纤维素的DTG和DTA的峰高与其取代度(DS)成一线性关系。  相似文献   

15.
研究纳米氧化锌替代普通氧化锌在天然橡胶(NR)/顺丁橡胶(BR)并用胶以及丁苯橡胶(SBR)胶料中的应用。结果表明,纳米氧化锌减量10%代替普通氧化锌,NR/BR并用胶及SBR胶料的加工性能和物理性能基本不变,质量减小,成本降低。  相似文献   

16.
以环保充油乳聚丁苯橡胶SBR1723作对比,研究环保充油溶聚丁苯橡胶T2830在轮胎胎面胶中的应用。结果表明:与SBR1723/天然橡胶(NR)/顺丁橡胶(BR)胶料相比,T2830/NR/BR胶料的起硫速度略快、硫化速度略慢;拉断伸长率和撕裂强度较高,硬度、定伸应力和拉伸强度相当;抗湿滑和抗干滑性能相当,干操控性能略差。采用T2830/NR/BR胎面胶的轮胎高速性能、耐久性能和滚动阻力与采用SBR1723/NR/BR胎面胶的轮胎相当。T2830可以替代SBR1723用于轮胎胎面胶。  相似文献   

17.
Styrene-butadiene rubber (SBR) is widely used in tires in the automotive segment and vulcanization using sulfur is a common process to enhance its mechanical properties. However, the addition of sulfur as the cross-linking agent usually results in impurities in pyrolysis products during rubber recycling, and thus the desulfurization during tire pyrolysis attracts much attention. In this work, the pyrolysis of vulcanized SBR is studied in detail with the help of ReaxFF molecular dynamics simulation. A series of crosslinked SBR models were built with different sulfur contents and densities. The following ReaxFF MD simulations were performed to show products distributions at different pyrolysis conditions. The simulation results show that sulfur products distribution is mainly controlled by sulfur contents and temperatures. The reaction mechanism is proposed based on the analysis of sulfur products conversion pathway, where most sulfur atoms are bonded with hydrocarbon radicals and the rest transfer to H2S. High sulfur contents tend to the formation of elemental sulfur intermediate, and temperature increase facilitates the release of H2S.  相似文献   

18.
用提纯的方法改性乳聚丁苯橡胶(ESBR),对比改性ESBR(TSBR)、ESBR和溶聚丁苯橡胶(SSBR)的加工工艺和物理性能,并考察3种丁苯橡胶(SBR)与天然橡胶(NR)和顺丁橡胶(BR)并用制备胎面胶的性能。结果表明:TSBR的炭黑分散性、硫化特性和物理性能较ESBR好,生热降低;弹性优于SSBR。TSBR可用于高性能轮胎胎面胶。  相似文献   

19.
王旭  常素芹  冯钠  戚晓霞 《弹性体》2013,23(1):58-64
分别采用一段和两段模压法制备了以顺丁橡胶(BR)/丁苯橡胶(SBR)/天然橡胶(NR)为基体的橡胶发泡材料,研究了三种化学发泡剂N,N'-二甲基戊次甲基四胺(H)、4,4'-氧代双(苯磺酰肼)(OBSH)以及H/OBSH(质量比1:1)复配对发泡及硫化特性的影-向,以及3种发泡剂和2种成型工艺对收缩率及相结构的影响。结果表明,发泡剂H对硫化性能影响最大,含发泡剂H的混炼胶在分解过程中释放的热量最多;加入3种发泡剂都具有一种较大的泡孔镶嵌在较小的泡孔丛中的泡孔形态;密度和线收缩率均随着时间的增加而增加,经H/OBSH复配的发泡剂更适合该体系成型,材料线收缩率均比单独使用H和OBSH小,两段模压法可以有效地提高发泡材料的尺寸稳定性,收缩率降低至3.88%,同时发泡剂使用率最多可提高31.67%。  相似文献   

20.
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.  相似文献   

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