钢丝帘线疲劳性能的影响因素研究

研究钢丝帘线的单丝直径、强度和结构设计对其弯曲疲劳性能的影响。结果表明：相同结构、同等强度等级的钢丝帘线,随着单丝直径的增大,钢丝帘线的破断力提高,但疲劳寿命反而缩短;相同结构、相同单丝直径的钢丝帘线,随着钢丝帘线破断力的增大,疲劳寿命显著延长;单丝直径与单丝根数相同,但结构不同的钢丝帘线,呈线接触1+18结构钢丝帘线的弯曲疲劳性能优于呈点接触1+6+12结构钢丝帘线;钢丝帘线超高强度化且具有良好的耐疲劳性能是轮胎钢丝帘线骨架材料的发展趋势。     

试样因素对橡胶钢丝复合体粘合性能测试的影响

研究夹持方式和钢丝帘线埋入长度对橡胶-钢丝帘线粘合性能测试结果的影响。结果表明：采用槽式结构夹具可以消除夹紧力对橡胶-钢丝帘线抽出力测试结果的影响;随着钢丝帘线埋入基体橡胶长度的增大,静态抽出力和最大伸长量均增大,但单位长度粘合强度随之呈指数衰减;橡胶-钢丝帘线的粘合存在摩擦力,钢丝帘线埋入橡胶长度越大,粘合失效到完全粘合失效经历的时间越长。     

试样因素对橡胶-钢丝帘线粘合性能测试的影响

研究夹持方式和钢丝帘线埋入长度对橡胶-钢丝帘线粘合性能测试结果的影响。结果表明:采用槽式结构夹具可以消除夹紧力对橡胶-钢丝帘线抽出力测试结果的影响;随着钢丝帘线埋入基体橡胶长度的增大,静态抽出力和最大伸长量均增大,但单位长度粘合强度随之呈指数衰减;橡胶-钢丝帘线的粘合存在摩擦力,钢丝帘线埋入橡胶长度越大,粘合失效到完全粘合失效经历的时间越长。     

钢丝帘线刚度的探讨

探讨结构不同破断力相同(近)、结构和单丝直径相同而单丝强度等级不同、结构相同单丝直径不同以及同一结构有无外缠丝等因素对钢丝帘线刚度的影响。通过数据对比表明,同一结构钢丝帘线单丝直径不同及有无外缠丝对钢丝帘线刚度影响最大,为保证轮胎的生产和质量,必须有效控制外缠结构钢丝帘线的刚度。     

工程机械子午线轮胎用钢丝帘线的性能测试

研究工程机械子午线轮胎用钢丝帘线破断力和粘合力测试方法.采用浇铸法测试较大直径工程机械子午线轮胎用钢丝帘线破断力,比常规夹具测试方法更准确;硫化模具和抽出夹具调整后,消除了因硫化模具中钢丝帘线间距过小造成抽出时相互干扰,数据不稳定的现象,提高了工程机械子午线轮胎钢丝帘线粘合力测试数据的准确性.     

子午线轮胎用钢丝帘线粘合力测定影响因素分析

研究抽出法测定子午线轮胎用钢丝帘线与胶料粘合力的影响因素。试验结果表明，若埋胶长度为12．5mm，则试样硫化时胶料厚度略大于放置钢丝帘线的沟槽底部与模具底部的距离、胶料用量为42g、抽出夹具孔径为9mm时，钢丝帘线抽出力测定结果较准确。     

疲劳次数对钢丝帘线/橡胶粘合性能的影响

采用自行研发的测试方法,研究疲劳次数对钢丝帘线/橡胶粘合性能的影响。结果表明:随着疲劳次数的增加,钢丝帘线的抽出力先增大后减小,当疲劳60万次时抽出力达到最大值;抽出钢丝帘线附胶形态无明显差别,且呈螺纹状;附胶越多,抽出力越大。扫描电子显微镜分析表明,钢丝帘线与橡胶界面处的橡胶断面上出现了更多的大粒径填料聚集体颗粒,成为粘合破坏点。     

疲劳温度对橡胶与钢丝帘线动态粘合性能的影响

采用自行研发的钢丝帘线与橡胶动态粘合性能的测试方法,考察动态疲劳温度对钢丝帘线/硫化橡胶粘合性能的影响。结果表明,随疲劳温度的升高,橡胶与钢丝帘线的抽出力先增大后降低,在60℃出现最大值,抽出力F与疲劳温度T有以下相关性:F=1 006+3.816 43T-0.033 39T2;抽出钢丝帘线附胶呈螺纹状,且螺纹方向与外缠绕钢丝方向并不总是相一致;附胶越多,抽出力越大;随疲劳温度的升高,橡胶与钢丝帘线界面处的橡胶断面上出现了越来越大的填料聚集体颗粒,这会成为粘合失效的诱因。     

7×7结构超高强度钢丝帘线破断力影响因素的探讨

从生产实际出发,研究影响7×7结构超高强度钢丝帘线破断力的因素。结果表明:7×7结构超高强度钢丝帘线破断力受多因素影响,其中一个重要的因素是单丝强度,当单丝强度大于3500 MPa时帘线破断力捻制损失急剧增大;破断力捻制损失与帘线结构有关,相同强度单丝捻制单股结构和层状结构钢丝帘线时,破断力捻制损失较小;7×7结构超高强度钢丝帘线破断力捻制损失受面股的影响较大,受芯股的影响较小,破断力捻制损失主要产生在股线合成帘线阶段,并且与合绳的捻距和放线张力稳定性有关,随着捻距越大,钢丝帘线的破断力捻制损失基本呈线性减小,张力稳定,帘线破断力捻制损失较小。     

芳纶帘线与胶料的粘合性能研究

研究芳纶帘线与钢丝帘线擦胶用天然橡胶（NR）胶料的粘合性能,以及粘合剂RA-65、间苯二酚、新癸酸钴、粘合剂RS对胶料物理性能和芳纶帘线与胶料粘合性能的影响。结果表明：对于钢丝帘线擦胶用NR胶料,芳纶帘线的H抽出力较大,但剥离力较小;粘合剂RA-65和间苯二酚可以提高胶料的硬度和芳纶帘线与胶料的粘合性能;粘合剂RS与间苯二酚对芳纶帘线与胶料的粘合性能的改善效果相近。     

275/70R22.5公交专用轮胎胎体钢丝帘线的微观界面剖析

对不同品牌的275/70R22.5公交专用轮胎使用后胎体钢丝帘线微观界面进行剖析。结果表明,0.20+6+12×0.175,3+9+15×0.175和3+9+15×0.175+0.15三种胎体钢丝帘线实际使用前后的破断力变化很小,H抽出力与新轮胎相比略小。A品牌选用0.20+6+12×0.175钢丝帘线,在胎侧屈挠区域胎体钢丝帘线内部完好无损,B和C品牌分别选用3+9+15×0.175和3+9+15×0.175+0.15钢丝帘线,胎侧屈挠区域钢丝帘线分别有明显的疲劳损伤现象。从B和C品牌轮胎的微观照片可以看出,钢丝帘线有明显疲劳磨损后产生的凹槽。     

炭黑硬度对胶料与钢丝帘线粘合力的影响

研究炭黑N326粒子硬度对轮胎带束层胶料物理性能以及胶料与钢丝帘线粘合力的影响.结果表明,随着炭黑N326粒子硬度的增大,带束层胶料门尼粘度、MH、ML、邵尔A型硬度、定伸应力和拉伸强度增大,拉断伸长率减小,焦烧时间和正硫化时间缩短;炭黑N326粒子硬度对硫化胶与钢丝帘线粘合力影响较大,两者呈正比关系.     

粘合树脂Elaztobond A250在全钢载重子午线轮胎带束层胶中的应用

试验研究粘合树脂Elaztobond A250在全钢载重子午线轮胎带束层胶中的应用。结果表明,在全钢载重子午线轮胎带束层胶中以2份粘合树脂Elaztobond A250替代L5份问苯二酚,以促进剂NS等量替代促进剂NOBS,胶料的工艺性能和硫化胶的物理性能变化不大,老化后胶料与钢丝帘线的H抽出力略有提高,成品轮胎的强度和耐久性能均超过国家标准要求,具有明显的环保优势。     

Influence of Cure Conditions on the Adhesion of Rubber Compound to Brass-plated Steel Cord. Part I. Cure Temperature

The effect of the cure temperature of rubber compound on the adhesion with brass-plated steel cord was investigated in conjunction with the formation, growth and degradation of the adhesion interphase formed between the rubber compound and brass-plated steel cord. With increasing cure temperature from 130°C to 190°C, the pull-out force after cure decreased linearly. This decrease in adhesion force at higher temperature may be explained by the limitation of the mass transfer of vulcanizing agents into the adhesion interphase and/or rubber compound near the adhesion interphase, resulting in a deficiency of sulfur due to the fast cure of the rubber compound which significantly retards the diffusion of vulcanizing chemicals. Also, at a high temperature, an adhesion interphase with a ZnS-rich layer, which may act as a barrier to copper diffusion for the formation of the adhesion interphase of copper sulfide, was formed. After thermal aging of the adhesion samples, the pull-out force decreased in comparison with that of the unaged. The decrease of pull-out force after thermal aging stemmed mainly from the decline of the tensile properties after thermal aging. The adhesion property after humidity aging was completely different from that after thermal aging. With increase in the cure temperature to 160°C, the pull-out force increased. But further increase in the cure temperature caused a decline in pull-out force. This phenomenon can be explained by the degradation of the adhesion interphase. At lower cure temperatures, a severe growth of copper sulfide and a large extent of dezincification were observed in the adhesion interphase. At higher cure temperatures, a significant growth of copper sulfide in the adhesion interphase appeared. The proper formation of the adhesion interphase and good physical properties of the rubber compound at a moderate cure temperature can result in high retention of adhesion properties.     

Influence of Cure Conditions on the Adhesion of Rubber Compound to Brass-plated Steel Cord. Part I. Cure Temperature

The effect of the cure temperature of rubber compound on the adhesion with brass-plated steel cord was investigated in conjunction with the formation, growth and degradation of the adhesion interphase formed between the rubber compound and brass-plated steel cord. With increasing cure temperature from 130°C to 190°C, the pull-out force after cure decreased linearly. This decrease in adhesion force at higher temperature may be explained by the limitation of the mass transfer of vulcanizing agents into the adhesion interphase and/or rubber compound near the adhesion interphase, resulting in a deficiency of sulfur due to the fast cure of the rubber compound which significantly retards the diffusion of vulcanizing chemicals. Also, at a high temperature, an adhesion interphase with a ZnS-rich layer, which may act as a barrier to copper diffusion for the formation of the adhesion interphase of copper sulfide, was formed. After thermal aging of the adhesion samples, the pull-out force decreased in comparison with that of the unaged. The decrease of pull-out force after thermal aging stemmed mainly from the decline of the tensile properties after thermal aging. The adhesion property after humidity aging was completely different from that after thermal aging. With increase in the cure temperature to 160°C, the pull-out force increased. But further increase in the cure temperature caused a decline in pull-out force. This phenomenon can be explained by the degradation of the adhesion interphase. At lower cure temperatures, a severe growth of copper sulfide and a large extent of dezincification were observed in the adhesion interphase. At higher cure temperatures, a significant growth of copper sulfide in the adhesion interphase appeared. The proper formation of the adhesion interphase and good physical properties of the rubber compound at a moderate cure temperature can result in high retention of adhesion properties.     

Influence of Cure Conditions on the Adhesion of Rubber Compound to Brass-plated Steel Cord. Part II. Cure Time

The effect of the cure time of a rubber compound on the adhesion with brass-plated steel cord was investigated. The formation, growth and degradation of the adhesion interphase formed between the rubber compound and brass-plated steel cord was also observed as well as the formation of a weak boundary layer in the rubber near the adhesion interphase. With increase in the cure time from a fourth to four times of t₉₀, the pull-out force after vulcanization increased significantly up to one-half of t₉₀ followed by a slight increase to t₉₀, and then decreased slowly with further increase in cure time. This decrease in pull-out force upon prolonged vulcanization may be explained by the severe degradation of rubber compound attached to the adhesion interphase. Also, upon prolonged vulcanization, the adhesion interphase with a rich ZnS layer may act as a barrier to copper diffusion which is required to form the adhesion interphase of copper sulfide. After thermal aging of the adhesion samples, the pull-out force decreased in comparison with that of the unaged. The decrease of pull-out force after thermal aging stemmed mainly from the decline of tensile properties after thermal aging. The adhesion after humidity aging was different from that after thermal aging. Upon increasing the cure time to one-half of t₉₀, the pull-out force increased. But a further increase in the cure time caused a decline in pull-out force. This phenomenon can be explained by the degradation of the adhesion interphase. At longer cure time, a severe growth of copper sulfide and a large amount of dezincification were observed in the adhesion interphase. At shorter cure time, a significant growth of copper sulfide in the adhesion interphase does not occur, whereas the formation a of a ZnS layer appeared after humidity aging. With increasing cure time, the formation of a weak boundary layer in the rubber near the adhesion interphase increased, resulting in the cohesive failure of the rubber layer. The proper formation of the adhesion interphase and the good physical properties of the rubber compound at optimum cure time can lead to the high retention of adhesion.     

930dtex/2-94锦纶66浸胶帘布在轿车子午线轮胎冠带层中的应用

试验研究930dtex/2-94锦纶66浸胶帘布在轿车子午线轮胎冠带层中的应用效果.结果表明,与930dtex/2-94改性锦纶66浸胶帘布相比,930dtex/2-94锦纶66浸胶帘布的断裂强力、H抽出力和干热收缩率低,帘线直径一致,定负荷伸长率高,两者主要性能均达到轮胎冠带层用纤维帘布指标要求.用930dtex/2-94锦纶66浸胶帘布替代930dtex/2-94改性锦纶66浸胶帘布用于轿车子午线轮胎冠带层,无需改变加工工艺和轮胎设计,成品轮胎的外缘尺寸、强度性能和高速性能基本不变,均达到相应国家标准要求,生产成本略微降低.     

羟甲基化木质素/白炭黑并用对NBR与镀铜钢丝粘合性能的研究

研究了羟甲基化木质素/白炭黑并用对NBR与镀铜钢丝的粘合性能和物理机械性能的影响。结果表明：随着羟甲基化木质素/白炭黑并用比减小,NBR胶料与镀铜钢丝的H抽出力先增大后减小,H抽出后钢丝表面附胶的SEM照片显示粘合破坏发生在橡胶相,表明羟甲基化木质素/白炭黑并用可以有效提高NBR与镀铜钢丝的粘合。     

2＋2×0.32ST超高强度钢丝帘线在半钢子午线轮胎带束层中的应用

研究2+2×0.32ST钢丝帘线替代2+2×0.35HT钢丝帘线在半钢子午线轮胎带束层中的应用。结果表明:与2+2×0.35HT钢丝帘线相比,2+2×0.32ST钢丝帘线的强度更高、直径更小、耐疲劳性能更好;在轮胎带束层中用2+2×0.32ST钢丝帘线替代2+2×0.35HT钢丝帘线后,工艺性能良好,成品轮胎的充气外缘尺寸变化不大,强度性能、高速性能、耐久性能和耐水压性能均能满足设计和国家标准要求,滚动阻力降低,同时有效减小了轮胎中的钢丝帘线和胶料用量,降低了生产成本。