改性粉煤灰制备及其对天然橡胶性能的影响
发布时间：2018-10-30 15:22
【摘要】：随着对粉煤灰的综合利用、深加工、应用范围的扩大和提高其附加值的广泛研究,改性粉煤灰作为新型填料在橡胶领域的应用范围也越来越广。目前对粉煤灰改性应用的手段普遍过于复杂、单一、成本过高,因而限制了其作为橡胶填料的广泛商业化应用。因此开发一种改性工艺简单,改性成本低廉和改性效果多元化的粉煤灰填料成为关键。本文利用硅烷偶联剂、钛酸酯偶联剂和铝酸酯偶联剂通过湿法搅拌、干法高混和干法研磨三种改性方法对粉煤灰进行改性,红外测试结果表明:经改性之后成功将有机基团接枝在粉煤灰表面,结合吸油值测定和偏光显微镜结果发现硅烷偶联剂在湿法搅拌条件下改性粉煤灰效果较好,而钛酸酯偶联剂和铝酸酯偶联剂在干法高混条件下改性效果良好。进一步利用钛酸酯偶联剂和铝酸酯偶联剂复配干法高混改性粉煤灰(CPWMFA)与硅烷偶联剂湿法搅拌改性粉煤灰(WSSiMFA)对比发现:CPWMFA亲油改性效果强于WSSiMFA,所采用偶联剂复配干法改性工艺简单,成本较低。进一步对比改性粉煤灰与炭黑填充天然橡胶的性能发现:改性粉煤灰填充天然橡胶的加工流动性能优于炭黑N550和N774,其中CPWMFA填充天然橡胶物理机械性能、老化性能与N550接近,优于N774和WSSiMFA。说明偶联剂复配干法改性粉煤灰在橡胶中填充补强效果优良,因此选择CPWMFA填充低硬度天然橡胶低硬度减振制品进行研究。研究结果表明:单独使用炭黑填充天然橡胶低硬度减振制品时,动、静刚度比较高,阻尼性能不良;钛酸酯偶联剂、铝酸酯偶联剂复配改性粉煤灰部分取代N550高填充天然橡胶低硬度减振制品,能够有效改善天然橡胶加工流动性能,降低胶料硬度和动、静刚度比,优化阻尼性能;完全取代N550、N774低填充天然橡胶低硬度减振制品条件下,其力学性能、老化性能和动态机械性能优良;与N774单独使用高填充天然橡胶条件下,在低频区,钛酸酯偶联剂、铝酸酯偶联剂复配改性粉煤灰填充天然橡胶阻尼性能不如N774,但是当频率到100HZ时,复配改性粉煤灰填充天然橡胶动、静刚度比较低,阻尼性能优良。
[Abstract]:With the comprehensive utilization of fly ash, deep processing, wide range of application and increasing the added value of fly ash, modified fly ash, as a new type of filler, is more and more widely used in the field of rubber. At present, the method of fly ash modification is too complex, single and high cost, which limits its wide commercial application as rubber filler. Therefore, it is the key to develop a kind of fly ash filler with simple modification process, low modification cost and multiple modification effect. In this paper, fly ash was modified by silane coupling agent, titanate coupling agent and aluminate coupling agent through wet stirring, dry high mixing and dry grinding. The results of IR test showed that the organic groups were grafted on the surface of fly ash after modification, combined with the measurement of oil absorption value and the results of polarizing microscope, it was found that the silane coupling agent had better effect on the modification of fly ash under wet stirring condition. And titanate coupling agent and aluminate coupling agent have good modification effect under dry process high mixing condition. Furthermore, the comparison of dry modified fly ash (CPWMFA) with titanate coupling agent and aluminate coupling agent with silane coupling agent wet stirring modified fly ash (WSSiMFA) shows that CPWMFA is better than WSSiMFA, in oil lipophilic modification. The dry modification process of coupling agent is simple and the cost is low. Comparing the properties of modified fly ash and carbon black filled natural rubber, it was found that the flowability of modified fly ash filled natural rubber was better than that of carbon black N550 and N774, and the physical and mechanical properties of CPWMFA filled natural rubber were close to that of N550. Better than N774 and WSSiMFA. The results showed that the coupling agent modified fly ash with dry method had good filling and reinforcing effect in rubber, so CPWMFA was selected to fill low hardness natural rubber and low hardness vibration absorption products. The results show that when carbon black is used alone to fill natural rubber with low hardness damping products, the dynamic and static stiffness is high and the damping property is poor. Titanate coupling agent, aluminate coupling agent and modified fly ash partially replace N550 high filled natural rubber with low hardness damping products, which can effectively improve the processing fluidity of natural rubber, reduce the hardness, dynamic and static stiffness ratio of rubber, Optimizing damping performance; The mechanical properties, aging properties and dynamic mechanical properties of N550 N774 filled natural rubber with low hardness and vibration absorption were excellent. Under the condition of using high filling natural rubber alone with N774, the damping property of modified fly ash filled with natural rubber in low frequency region, titanate coupling agent and aluminate coupling agent is not as good as that of N774, but when the frequency reaches 100HZ, Compound modified fly ash is filled with natural rubber with low static stiffness and excellent damping property.
【学位授予单位】：湖北工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ332
[Abstract]:With the comprehensive utilization of fly ash, deep processing, wide range of application and increasing the added value of fly ash, modified fly ash, as a new type of filler, is more and more widely used in the field of rubber. At present, the method of fly ash modification is too complex, single and high cost, which limits its wide commercial application as rubber filler. Therefore, it is the key to develop a kind of fly ash filler with simple modification process, low modification cost and multiple modification effect. In this paper, fly ash was modified by silane coupling agent, titanate coupling agent and aluminate coupling agent through wet stirring, dry high mixing and dry grinding. The results of IR test showed that the organic groups were grafted on the surface of fly ash after modification, combined with the measurement of oil absorption value and the results of polarizing microscope, it was found that the silane coupling agent had better effect on the modification of fly ash under wet stirring condition. And titanate coupling agent and aluminate coupling agent have good modification effect under dry process high mixing condition. Furthermore, the comparison of dry modified fly ash (CPWMFA) with titanate coupling agent and aluminate coupling agent with silane coupling agent wet stirring modified fly ash (WSSiMFA) shows that CPWMFA is better than WSSiMFA, in oil lipophilic modification. The dry modification process of coupling agent is simple and the cost is low. Comparing the properties of modified fly ash and carbon black filled natural rubber, it was found that the flowability of modified fly ash filled natural rubber was better than that of carbon black N550 and N774, and the physical and mechanical properties of CPWMFA filled natural rubber were close to that of N550. Better than N774 and WSSiMFA. The results showed that the coupling agent modified fly ash with dry method had good filling and reinforcing effect in rubber, so CPWMFA was selected to fill low hardness natural rubber and low hardness vibration absorption products. The results show that when carbon black is used alone to fill natural rubber with low hardness damping products, the dynamic and static stiffness is high and the damping property is poor. Titanate coupling agent, aluminate coupling agent and modified fly ash partially replace N550 high filled natural rubber with low hardness damping products, which can effectively improve the processing fluidity of natural rubber, reduce the hardness, dynamic and static stiffness ratio of rubber, Optimizing damping performance; The mechanical properties, aging properties and dynamic mechanical properties of N550 N774 filled natural rubber with low hardness and vibration absorption were excellent. Under the condition of using high filling natural rubber alone with N774, the damping property of modified fly ash filled with natural rubber in low frequency region, titanate coupling agent and aluminate coupling agent is not as good as that of N774, but when the frequency reaches 100HZ, Compound modified fly ash is filled with natural rubber with low static stiffness and excellent damping property.
【学位授予单位】：湖北工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TQ332
【参考文献】
相关期刊论文 前10条
1 周文敏;宋新星;孙，
本文编号：2300381
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