无石棉密封垫片硫化工艺对及压缩回弹性能的影响

Influence of Vulcanization Process on Compression and Rebound Performance of Non-asbestos Gaskets

采用均匀实验方案,研究硫磺和硫化促进剂TMTD用量、硫化温度、硫化时间、硫化压力5种硫化工艺参数对无石棉密封橡胶垫片压缩回弹性能的影响,采用多元线性回归方法研究压缩率和回弹率与各硫化工艺参数的关系,并提出回归模型。结果表明,硫化温度、硫化压力以及硫化时间对压缩率的影响较大,提高硫化温度、时间和压力均有利于压缩率的降低;硫磺用量对垫片压缩率有负面影响;硫化促进剂TMTD与硫化温度交互影响压缩率,增加促进剂的用量可降低硫化反应温度,而提高硫化温度可减少促进剂用量。利用建立的回归模型对不同硫化工艺下制备的垫片试样的性能进行预测,预测值与实测值较接近。

A homogeneous experimental design was used to study influence of vulcanization process of 5 independent variables as sulfur and vulcanization accelerant TMTD dosage,vulcanization temperature,time and pressure on compression and rebound performance of non-asbestos gaskets. By using of multiple linear regression method,the relationship between the compression rate and rebound with all process parameters was studied,and a regression model was set up. The results show that the vulcanization temperature,pressure and time have a great influence of on the compression rate. The increase of vulcanization temperature,pressure and time is favorable to decrease the compression rate,while the increase of sulfur content has a negative effect on the compression ratio. Accelerant TMTD dosage and temperature have an interactive influence on the compression rate,and the increasing of TMTD can reduce vulcanization temperature,while the increasing of vulcanization temperature can reduce the TMTD dosage. The performance of the gasket samples prepared under different vulcanization process was predicted by the regression model,and the predicted values were quite close to the practical measured values.