全钢载重子午线轮胎胎冠气泡的解决措施

分析全钢载重子午线轮胎胎冠气泡的特征和形成原因,并提出排除气泡的措施.通过采取合理设定带束层宽度,保证带束层级差在15 mm以上,合理设计胎面和胎肩垫胶断面形状,合理选取成型胎面压辊形状、成型压力和胎面存放方式,取消第3和第4层带束层包边,改善半成品表面粘性以及胎肩刺孔等措施,有效减少了全钢载重子午线轮胎胎冠气泡缺陷.     

全钢载重子午线轮胎冠部气泡原因分析及解决措施

分析全钢载重子午线轮胎冠部气泡的产生原因,并提出相应解决措施.通过采取带束层接头对接、增设胎肩垫胶压排气线装置、改进部分规格胎面存放方式、取消带束层包边、调整成型压合参数、改造压辊结构及调整冠部材料分布等措施,有效降低了全钢载重子午线轮胎冠部气泡率.     

全钢载重子午线轮胎胎肩气泡的原因分析及解决措施

分析全钢载重子午线轮胎胎肩气泡的产生原因,并提出相应解决措施.通过采取严格控制挤出排胶温度以及压延供胶温度和辊温、确保半成品部件表面充分干燥、修正挤出口型、严格控制半成品停放时间、定期检查成型机精度、合理设置后压辊在肩部的摆转位置和停顿时间、定期检查维护硫化管路、合理设定硫化条件以及硫化前用细针刺胎坯胎肩部位等措施,有效减小了全钢载重子午线轮胎胎肩气泡的发生率.     

全钢载重子午线轮胎胎侧气泡原因分析及解决措施

分析全钢载重子午线轮胎胎侧气泡产生的原因,并提出相应的解决措施。通过控制三角胶边部厚度,优化胎侧形状、成型胶囊防滑层宽度和充气时间,有效降低了胎侧气泡缺陷率,提高了轮胎质量,降低了生产成本。     

11.00R20全钢载重子午线轮胎胎肩产生气泡的原因及解决措施

分析11.00R20全钢载重子午线轮胎胎肩产生气泡的原因,以及解决措施。成型时滚压胎肩的位置和摆转角度不准确是产生胎肩泡的主要原因,通过调整后压辊滚压压力、摆转角度、滚压完成位置及滚压速度,可以有效解决胎肩气泡问题。     

全钢载重子午线轮胎胎体帘线变形原因分析及解决措施

分析全钢载重子午线轮胎胎体帘线变形的产生原因并提出了相应解决措施。通过采取调整和校准平面宽度、调整钢丝圈夹持器爪的位置、正确设定和校准机头宽度、增大锁块伸张行程或在锁块胶囊下面加垫胶环、成型定型压力控制在0.07～0.11MPa、硫化一次定型压力控制在0.08～0.12MPa、适当调整胎面尺寸、胎侧胶反包到位等措施,有效解决了全钢载重子午线轮胎胎体帘线变形问题,提高了成品轮胎X光检验合格率。     

11.00R20轮胎胎肩缺胶和裂口产生原因及解决措施

分析11.00R20全钢载重子午线轮胎胎肩缺胶和裂口的产生原因,并提出相应的解决措施。通过适当调整胎肩部位的材料分布、重新设定胎面复合件的尺寸、在模具胎肩花纹处增加周向排气孔,保证胎面上正、调整胎侧压辊压力和成型定型压力、定期清洗模具等措施,基本上解决了胎肩缺胶的问题。     

全钢载重子午线轮胎胎圈气泡原因分析及解决措施

分析全钢载重子午线轮胎胎圈气泡产生的原因并提出相应的解决措施。通过采取避免半成品部件端点窝气、排出半成品部件贴合时层间气体以及提高胎圈材料匹配性等措施,有效降低了全钢载重子午线轮胎胎圈气泡发生率,提高了产品质量。     

全钢载重子午线轮胎硫化胶边的原因分析及解决措施

从设备装配、硫化工艺、胎坯和模具设计等方面分析全钢载重子午线轮胎硫化胶边的产生原因,通过采取适度调整花纹块、侧板背面加垫片、更换模壳或对花纹块分形面进行焊补维修处理、调整硫化工艺、严格控制成型和硫化环境温度及胎坯温度、对模具侧板分型处进行溢胶槽和溢胶孔加工改造等措施,基本解决了全钢载重子午线轮胎模缝胶边问题,提高了产品质量。     

全钢载重子午线轮胎肩空脱层原因分析与解决措施

分析全钢载重子午线轮胎肩空脱层现象的原因并提出相应的解决措施。结果表明,轮胎半成品部件界面污染、部分部件厚度超差、胎肩垫胶移位、易生热、帘布渗胶性能差、轮胎选用不当等是造成全钢载重子午线轮胎发生肩空脱层的主要原因,通过改进配方、优化工艺控制流程等措施,肩空脱层轮胎理赔率降低74.39%。     

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。     

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.     

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。     

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.     

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.     

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.     

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.