载重斜交轮胎胎圈爆破及钢丝刺出的对策

通过调整载重斜交轮胎钢丝包胶、三角胶配方，增大钢丝挂胶挤出口型尺寸及改进生产工艺，提高了载重斜交轮胎胎圈质量，减少了胎圈空及错位等质量问题，使轮胎速度性能得到提高，11．00—20 16PR载重轮胎耐久性能达到120h。     

改进设计提高载重斜交轮胎负荷能力

采取胎圈结构设计由双钢丝圈改为三钢丝圈、改进胎圈外轮廓设计、提高胎圈强度等措施后，较好地解决了载重斜交轮胎在实际使用中出现磨胎圈、胎圈爆以及胎圈部胎里帘线断裂等造成早期损坏的问题，同时提高了载重斜交轮胎在复杂路况条件下使用的负荷能力。     

载重斜交轮胎胎里露线成因及改进措施

针对载重斜交轮胎胎里露线问题，从轮胎结构设计和制造工艺两方面查找原因，通过调整模具尺寸、采用宽缓冲层结构、改进材料分布图尺寸、确定合适的帘线假定伸张值以及加强工艺管理等改进措施，有效解决了胎里露线问题。     

轻型载重斜交轮胎胎圈部位质量缺陷原因分析及解决措施

胎圈爆和钢丝刺出是我公司轻型载重斜交轮胎胎圈部位主要质量缺陷。我们通过对退赔轮胎进行分析,从结构设计、配方设计、生产工艺及装备等方面制定了相应的解决措施,取得了良好效果,现将有关情况简要介绍如下。1原因分析退赔轮胎胎圈爆和钢丝刺出质量缺陷如图1和2所示,其主要产     

胎体帘线角对斜交轮胎性能的影响

应用ANSYS有限元程序对载重斜交轮胎进行了分析，结果表明，在自由充气状态下，胎体帘线角度对斜交轮胎的轮廓尺寸及胎体帘布承受的应力影响明显，而对胎圈接触应力影响较小。     

充气压力对充气工况载重斜交轮胎影响的有限元分析

进行了充气压力对充气工况载重斜交轮胎影响的有限元分析.结果表明,充气工况下,充气压力对斜交轮胎外形轮廓尺寸影响明显,其外直径、断面宽度均随充气压力的增大而增加;充气压力的大小对胎圈接触应力分布影响很小,但胎圈最大接触应力随充气压力的增加而增大.     

9.00-20 16PR轮胎的结构设计改进

通过对9．00－2016PR载重斜交轮胎轮廓设计（模型尺寸、行驶面、断面水平轴和胎面花纹）、施工设计（胎面、缓冲层、反包高度、帘布裁断角度、三角胶尺寸、机头宽度、骨架材料和轮胎外观）的改进及工艺管理的加强，提高了轮胎的耐久、速度和超载性能，减少了9．00－2016PF载重斜交轮胎的胎圈爆破和肩空现象。     

全钢载重子午线轮胎胎圈大边原因分析及解决措施

分析全钢载重子午线轮胎胎圈部位出现大边的原因,并提出相应的解决措施。优化胎圈部位的材料分布、钢丝圈和半成品部件的形状及尺寸设计、成型鼓扇形块压力,控制硫化机械手对中度和张开度精度,改进成型胶圈和模具钢圈的形状设计,可减少胎圈大边的发生,使全钢载重子午线轮胎胎圈大边发生率由6%降到了1.5%。     

全钢载重子午线轮胎胎圈气泡的产生原因及改进措施

分析全钢载重子午线轮胎胎圈气泡的产生原因并提出相应改进措施。施工设计及半成品尺寸不当、排气线完整性差、成型贴合压辊位置不合理及硫化模具钢圈排气线不通等均会导致胎圈气泡缺陷。经过优化施工设计、增加胎侧及加强层刺孔工艺、规范半成品尺寸过渡及成型辊压等措施能够有效减少胎圈气泡的产生,提高轮胎合格率。     

载重斜交轮胎胎圈钢丝包胶配方的改进

对载重斜交轮胎胎圈钢丝包胶配方进行改进,通过调整生胶体系,降低胎圈钢丝包胶中填料的用量,适当提高炭黑用量,采用间-甲-白和钴盐并用的粘合体系等途径,提高了胎圈钢丝包胶的强度,改善了与钢丝的粘合性能,减小了载重斜交轮胎胎圈爆破和胎圈钢丝刺出等缺陷,成品轮胎的胎圈问题退赔率由原来的1.3%降为0.1%以下,显著提高了轮胎的实际使用寿命。     

乙苯,苯乙烯的生产及合成乙苯,苯乙烯催化剂的研究进展

苯乙烯是重要的石油化工原料。本文介绍了国内外苯乙烯生产的发展概况，合成乙苯，苯乙烯所用的催化剂种类，并就苯乙烯生产及催化剂的发展趋势提出了自己的观点。     

Synthesis and characterization of homopolymers and copolymers of various acrylates and acrylonitrile

Various homopolymers and copolymers of methyl acrylate, ethyl acrylate, butyl acrylate, and acrylonitrile in different feed ratios were synthesized. These were characterized by IR, ¹³C-NMR, DSC, DTA, and TGA. Spectroscopic characterization helped in differentiating copolymers of different mol ratios. Thermal analysis revealed different degradation patterns for homopolymers and copolymers. The temperature and energy changes associated with various phase transitions were dependent on the chemical composition of homo- and copolymers, as expected. © 1993 John Wiley & Sons, Inc.     

生物质气化及生物质与煤共气化技术的研发与应用

总结了生物质原料的特点及生物质单独气化的缺点;介绍了国内外生物质气化技术及生物质与煤共气化技术的研发与应用现状;分析了在此领域国内外的发展趋势与前景;概括了开展生物质与煤共气化技术研发的意义。     

责任和责任心的涵义与结构

责任是人应主动承担的角色义务和对其因过失所造成后果应承担的责罚.有两层涵义:一是义务;二是后果.责任心是个体自觉做好分内事务和履行道德义务的心理倾向,是个性心理品质成分中自我特征维度上的重要内容.责任心具有两个方面的涵义:一是角色分内职责;二是角色道德义务.责任心是一种通过责任认知、责任个性和责任适应的动态形式表现出来的静态品质,责任心是责任心过程结构与责任心关系结构相互制约、相互影响的统一体.     

二甲基二烯丙基氯化铵和丙烯酰胺的合成及应用

用复合引发体系(过硫酸盐-偶氮类引发剂)和脂肪胺类氧化还原体系引发,在实验室获得了单体转化率≥98%,特性粘数高于13.6 dL/g的阳离子共聚物PDA,探讨了控制聚合物分子量的影响因素.     

Comparison of the Adhesion and Cohesion of Triblock and Random Copolymers of Styrene and Butadiene

A substantially greater detachment energy is required to strip a polyethylene tereph-thalate (Mylar) film from a styrene-butadiene-styrene (SBS) triblock copolymer compared to that for peeling from a random styrene-butadiene (SBR) copolymer. This is true even though the intrinsic interaction between the Mylar and each elastomer is expected to be similar because of their virtually identical chemical composition. It is proposed that this difference in peel strength (between the SBS and SBR) is a consequence of the much higher dissipative capacity of the former elastomer. Another manifestation of this is the higher cohesive tear strength of the SBS compared to the SBR. Extents of energy dissipation within each elastomer during detachment of the Mylar adherend are consistent with the hypothesis that the average maximum stress experience before detachment is some similar fraction of each elastomer's tensile strength.     

Kinetics and Mechanism of Oxidation of Mono- and Polyacetals

Abstract

Kinetics and mechanisms of oxidation of 6 acetals by molecular oxygen and ozone in liquid phase have been studied. Reaction with molecular oxygen (70°C, 15–16 hr) leads to the formation monoethers of the corresponding glycols with 68–90% selectivity. Salts of metals and complexes with crown-ethers have increased the reaction rate significally. Ozone have reacted with acetals with formation similar products. The mechanisms of intermediate stages have been proposed.     

钾盐资源及钾肥供需情况分析及预测

阐述了国内外钾盐资源及钾肥生产现状,对国内外钾盐的供需形势进行了分析及预测,从资源、原材料、国际市场三方面提出了解决我国钾盐短缺的措施。     

Electronic structures and reactivities of monometallic and bimetallic clusters of Au and Cu

The variation of the Au 4f binding energy of Au clusters with the cluster size has been established by measuring the binding energies of clusters whose size distributions were independently determined by HREM and STM. The binding energy increases significantly when the cluster size is less than 2 nm. Au-Cu bimetallic clusters of the composition Cu₃Au have been deposited for the first time on carbon substrates. The shifts in the core level binding energies of the bimetallic clusters show the effect of alloying in the case of large clusters, but show effects of both alloying and cluster size in the case of the small clusters. The interaction of CO with Cu₃Au clusters is stronger than with a bulk Cu metal. The interaction of CO with small Cu clusters also seems to be stronger than with bulk Cu or with large Cu clusters.     

Wetting properties of homopolymers and copolymers of pentafluorostyrene and methylacrylate and homopolymer blends

Polypentafluorostyrene (PPFS), polymethylacrylate (PMA), and poly(pentafluorostyrene-co-methylacrylate), poly(PFS-co-MA) were prepared and the wetting characteristics of polymer blends of PPFS and PMA were compared with that of poly(PFS-co-MA) via contact angle measurements. The critical surface tension of polypentafluorostyrene was found to be 22.6 dyne/cm, which is comparable to the value reported for polytrifluoroethylene (22 dyne/cm). The critical surface tension of poly(PFS-co-MA) is not linearly related to its composition. The polymer blends of PPFS and PMA exhibit significant surface enrichment of the fluoropolymer. The harmonic-mean method¹ was employed to determine surface tensions of these polymers and many known polymers. It is found that the method produces useful surface tension data provided the contact angle values are derived from testing liquids of dissimilar polarity.