板式换热器用三元乙丙橡胶垫的研制
关键词： 板式换热器；三元乙丙橡胶；耐热老化；力学性能
Development of EPDM rubber pad for Plate heat exchanger
Abstract
This paper studied the effects of different ratio on the mechanical properties and aging properties at elevated temperatures by adding different types of antioxidant and other additives in EPDM. We tested the mechanical properties and aging resistance performance of the EPDM rubber. The results show that: zinc methacrylate as rubber additive and curing agent and heat resistant additive has a good performance and outstanding reinforcing effect on the EPDM rubber which greatly improves the mechanical properties. However, zinc methacrylate may promote crosslinking and makes rubber become harder and reduce their elastic properties.
Several antioxidants have good performance and have greatly improved the thermal properties of rubber. Those antioxidants can effectively protect the rubber from metal damage and enhance the compatibility of rubber and metal, so the several antioxidants are very suitable for rubber gasket.
Keywords: EPDM; Mechanical properties; Aging properties; Plate heat exchanger
目录
1. 绪论 1
1.1 板式换热器的简介 1
1.2橡胶密封垫在板式换热器中应用 1
1.2.1橡胶密封垫的应用和现状 1
1.2.2板式换热器用橡胶密封垫片的工艺加工方法 2
1.2.3橡胶垫片的密封原理 2
1.2.4板式换热器密封垫片的文护和保养 4
1.3 板式换热器的失效和主要的防范措施 5
1.3.1 压力造成的失效 5
1.3.2 温度变化造成的失效 6
1.3.3 时间对失效的影响 6
1.4三元乙丙橡胶（EPDM）简介 6
1.4.1 生产工艺 6
1.4.2 橡胶的老化 7
1.4.3 橡胶垫可能存在的性能问题 8
2. 实验原材料、设备及方法 8
2.1 原材料及仪器 8
2.2 实验内容及关键步骤 9
2.2.1拉伸试样的制备 11
2.2.2硬度测量试样的制备 12
2.2.3回弹性测定 12
2.3性能测试方法 12
2.3.1 回弹性能测试方法 12
2.3.2 硫化橡胶硬度测定 13
2.3.3 拉伸性能测定 14
2.3.4 老化试验 16
3. 结果讨论 16
3. 1橡胶的回弹性能 16
3. 2硬度测试 17
3. 3橡胶的拉伸性能 18
3. 4橡胶的老化性能 21
4. 结论 25