间甲钴黏合体系在轮胎骨架材料中的黏合机理研究

Study on Adhesion Mechanism of Resorcinol Formaldehyde Cobalt Salt Adhesive System in Tire Skeleton Materials

为验证与进一步探索黏合树脂及钴盐对轮胎与镀铜钢丝帘线的增黏作用机理,选取传统黏合树脂R80与2种新型黏合树脂HT1005和H620,通过对2种新型黏合树脂的结构分析、橡胶硫化特性、静态T抽出测试与力学性能测试,并设计了一种新的黏合层强度测试方法与黏合层表征方法,进行机理探索,得出如下结论:含有羟基的极性黏合树脂在橡胶硫化时,会由于与非极性天然橡胶的极性差异产生的热力学不相容从而产生自动相分离,向橡胶与镀铜钢丝的界面层进行迁移汇集,且极性越高迁移能力越强,产生一个介于橡胶与镀铜钢丝之间的树脂富集层.因为黏合树脂交联反应温度为140℃左右,会在天然橡胶硫化反应时发生同步交联反应,黏合树脂形成的网络模量高于橡胶硫化网络,会增强镀铜钢丝与橡胶之间的黏合层强度,并形成一个镀铜钢丝与橡胶之间的模量过渡层,进一步增强黏合层.且极性越强,树脂网络交联程度与橡胶硫化网络交联程度越接近,增黏效果越好;钴盐会活化橡胶中的S,使更多的S迁移到镀铜钢丝表面从生成更多硫化亚铜键,增强黏合.

The strong adhesion between the rubber and the skeleton material determines the performance of the tire. Most of the damage such as puncture, fatigue, and delamination of the tire are caused by the failure of the adhesion between the rubber and the skeleton material. The adhesion of the material is directly related to the performance and life of the tire. In order to verify and further explore the mechanism of adhesion of the adhesive resin and cobalt salt to the tire and the copper-plated steel cord, the conventional adhesive resin R80 and two new adhesive resins HT1005 and H620 were selected to analyze the mechanism of adhesion through structural analysis, rubber vulcanization characteristics, T extraction test, a new adhesive layer strength test method and adhesive layer characterization method. The results show that the polar adhesive resin containing hydroxyl groups will be auto-phase-separated due to thermodynamic incompatibility with the polarity difference of non-polar natural rubber when vulcanized. The adhesive resin migrates to the interface layer between the rubber and the copper-plated steel wire, producing a resin-rich layer between the rubber and the copper-plated steel wire. Since the crosslinking temperature of the binder resin is about 140℃, synchronous crosslinking reaction will occur in natural rubber vulcanization reaction. The network modulus of the binder resin is higher than that of the rubber vulcanization network, which will enhance the adhesion strength between the copper-plated steel wire and the rubber, and form a modulus transition layer between the copper-plated steel wire and the rubber. A modulus transition layer between the rubber and the rubber further enhances the adhesive layer.