天然橡胶混炼胶的四辊压延粘辊问题分析
|
摘要
天然橡胶(NR)混炼胶的流变性能影响后续的挤出、压延等工艺过程。文中分析了轮胎带束层的四辊压延行为,介绍了压延粘辊问题,使用门尼黏度仪和RPA2000橡胶加工分析仪分别测试了由不同产地、不同批次天然生胶所制混炼胶的门尼黏度和动态黏弹性能。结果表明,不同产地、不同批次天然生胶所制混炼胶的门尼黏度接近,难以分辨辊筒操作性能的差异;而损耗模量可以作为关键指标衡量NR混炼胶的辊筒操作性能,在条件相同时易粘辊的混炼胶表现出更高的损耗模量。此外,RPA2000橡胶加工分析仪测得的复数黏度可以用于分辨不同产地、不同批次天然生胶所制混炼胶的辊筒操作性能。降低压延速度能有效改善粘辊问题,这是因为NR混炼胶的储能模量和损耗模量均随加工频率的降低而减小。
Rheological properties of natural rubber(NR) compounds can affect the subsequent extrusion and rolling performance. In this paper, the process for double coating of tire belt with rubber compound by four-roll calender was analyzed, and the problem of roller sticking was introduced. The Mooney viscometer and the RPA2000 rubber processing analyzer were used to test the Mooney viscosity and dynamic viscoelasticity of NR compounds of which natural raw rubbers were produced at different regions and with different batches. The results reveal that Mooney viscosities of NR compounds produced by natural raw rubbers with different producing areas and different batches are close and difficult to be distinguished; nevertheless the loss modulus can be used as a key indicator to evaluate the rolling performance of NR compounds, and the more sticky compounds show a higher loss modulus under the same condition. Besides, the complex viscosity measured by RPA2000 can be used to distinguish the processability of NR compounds with different raw rubber producing areas and different batches. Reducing the rolling speed can effectively solve the roller sticking problem, because the storage modulus and loss modulus of NR compounds decrease with the decrease of processing frequency.
Rheological properties of natural rubber(NR) compounds can affect the subsequent extrusion and rolling performance. In this paper, the process for double coating of tire belt with rubber compound by four-roll calender was analyzed, and the problem of roller sticking was introduced. The Mooney viscometer and the RPA2000 rubber processing analyzer were used to test the Mooney viscosity and dynamic viscoelasticity of NR compounds of which natural raw rubbers were produced at different regions and with different batches. The results reveal that Mooney viscosities of NR compounds produced by natural raw rubbers with different producing areas and different batches are close and difficult to be distinguished; nevertheless the loss modulus can be used as a key indicator to evaluate the rolling performance of NR compounds, and the more sticky compounds show a higher loss modulus under the same condition. Besides, the complex viscosity measured by RPA2000 can be used to distinguish the processability of NR compounds with different raw rubber producing areas and different batches. Reducing the rolling speed can effectively solve the roller sticking problem, because the storage modulus and loss modulus of NR compounds decrease with the decrease of processing frequency.
引文
[1] Nutter J I. Calender and extrusion coating of industrial fabrics[J]. J. Coat. Fabr., 1991, 20: 249-265.
[2] 刘恒武. NR混炼胶加工性能分析及预测[J]. 轮胎工业, 2006, 26(5): 304-306. Liu H W. Analysis and prediction of processibility of NR mix[J].Tire Industry,2006, 26(5): 304-306.
[3] Cadek D, Kuta A. Processing properties of Asian and African natural rubbers[J]. Kautschuk Gummi Kunststoffe, 2011, 64: 19-23.
[4] Stevens C A, Dick J S. Factory testing and control of raw natural rubber and mixed batches using the rubber process analyzer[J]. Kautschuk Gummi Kunststoffe, 2001, 54: 29-35.
[5] Dick J S. Rubber technology [M]. Munich:Hamser, 2001.
[6] 冯成果, 王其营, 王善河,等. XY-4г1730型四辊压延机辊筒的修复[J]. 橡塑技术与装备, 2005 (2): 45-48. Feng C G, Wang Q Y, Wang S H, et al. Roller repairing of XY-4г1730 4-roll calender[J]. China Rubber/Plastics Technology and Equipment,2005 (2): 45-48.
[7] 丁庆凯. CR粘辊问题的研究[J]. 橡胶工业, 2003,50 (1): 42-43. Ding Q K. Causes for sticking-to-mill roll of CR and their countermeasures[J].China Rubber Industry, 2003, 50(1): 42-43.
[8] Chen F L, Cen L, Lei C H. Study on the milling behavior of chloroprene rubber blends with ethylene-propylene-diene monomer rubber, polybutadiene rubber, and natural rubber[J]. Polym. Compos., 2007, 28: 667-673.
[9] 陈福林, 岑兰, 周彦豪. CR与EPDM, BR或NR并用胶混炼性能的研究[J]. 橡胶工业, 2007, 54(8): 475-478. Chen F L, Cen L, Zhou Y H. Mixing behaviour of CR blends with EPDM,BR or NR[J].China Rubber Industry, 2007, 54(8): 475-478.
[10] 陈建华. 橡胶加工过程中橡胶-金属滑动界面的摩擦特性研究[D]. 哈尔滨:哈尔滨工业大学, 2016. Chen J H. Study on friction properties of rubber-mental sliding interfaces in rubber processing[D]. Harbin: Harbin Institute of Technology, 2016.
[11] 陈名行, 蔡尚脉, 李花婷, 等. 胶料辊筒操作性能的分析与表征[J]. 橡胶科技, 2016, 14(6): 16-20. Chen M X, Cai S M, Li H T, et al.Analysis and characterization of roller operational performance of rubber[J].Rubber Science and Technology, 2016, 14(6): 16-20.
[12] 王贵一. RPA2000橡胶加工分析仪在橡胶研究中的应用[J]. 特种橡胶制品, 2001, 22(1): 56-62. Wang G Y. Application of rubber processability tester RPA2000 to rubber study[J].Special Purpose Rubber Products, 2001, 22(1): 56-62.
[13] Dick J S, Harmon C, Vare A. Quality assurance of natural rubber using the rubber process analyzer[J]. Polym. Test., 1999, 18: 327-362.
[14] Campion R P. The influence of structure on autohesion (self-tack) and other forms of diffusion into polymers[J]. J. Adhes., 1975, 7: 1-23.
[2] 刘恒武. NR混炼胶加工性能分析及预测[J]. 轮胎工业, 2006, 26(5): 304-306. Liu H W. Analysis and prediction of processibility of NR mix[J].Tire Industry,2006, 26(5): 304-306.
[3] Cadek D, Kuta A. Processing properties of Asian and African natural rubbers[J]. Kautschuk Gummi Kunststoffe, 2011, 64: 19-23.
[4] Stevens C A, Dick J S. Factory testing and control of raw natural rubber and mixed batches using the rubber process analyzer[J]. Kautschuk Gummi Kunststoffe, 2001, 54: 29-35.
[5] Dick J S. Rubber technology [M]. Munich:Hamser, 2001.
[6] 冯成果, 王其营, 王善河,等. XY-4г1730型四辊压延机辊筒的修复[J]. 橡塑技术与装备, 2005 (2): 45-48. Feng C G, Wang Q Y, Wang S H, et al. Roller repairing of XY-4г1730 4-roll calender[J]. China Rubber/Plastics Technology and Equipment,2005 (2): 45-48.
[7] 丁庆凯. CR粘辊问题的研究[J]. 橡胶工业, 2003,50 (1): 42-43. Ding Q K. Causes for sticking-to-mill roll of CR and their countermeasures[J].China Rubber Industry, 2003, 50(1): 42-43.
[8] Chen F L, Cen L, Lei C H. Study on the milling behavior of chloroprene rubber blends with ethylene-propylene-diene monomer rubber, polybutadiene rubber, and natural rubber[J]. Polym. Compos., 2007, 28: 667-673.
[9] 陈福林, 岑兰, 周彦豪. CR与EPDM, BR或NR并用胶混炼性能的研究[J]. 橡胶工业, 2007, 54(8): 475-478. Chen F L, Cen L, Zhou Y H. Mixing behaviour of CR blends with EPDM,BR or NR[J].China Rubber Industry, 2007, 54(8): 475-478.
[10] 陈建华. 橡胶加工过程中橡胶-金属滑动界面的摩擦特性研究[D]. 哈尔滨:哈尔滨工业大学, 2016. Chen J H. Study on friction properties of rubber-mental sliding interfaces in rubber processing[D]. Harbin: Harbin Institute of Technology, 2016.
[11] 陈名行, 蔡尚脉, 李花婷, 等. 胶料辊筒操作性能的分析与表征[J]. 橡胶科技, 2016, 14(6): 16-20. Chen M X, Cai S M, Li H T, et al.Analysis and characterization of roller operational performance of rubber[J].Rubber Science and Technology, 2016, 14(6): 16-20.
[12] 王贵一. RPA2000橡胶加工分析仪在橡胶研究中的应用[J]. 特种橡胶制品, 2001, 22(1): 56-62. Wang G Y. Application of rubber processability tester RPA2000 to rubber study[J].Special Purpose Rubber Products, 2001, 22(1): 56-62.
[13] Dick J S, Harmon C, Vare A. Quality assurance of natural rubber using the rubber process analyzer[J]. Polym. Test., 1999, 18: 327-362.
[14] Campion R P. The influence of structure on autohesion (self-tack) and other forms of diffusion into polymers[J]. J. Adhes., 1975, 7: 1-23.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |