双马树脂及其复合材料微波固化工艺与性能研究
发布时间：2018-12-25 19:21
【摘要】：本文以微波固化技术在双马树脂基复合材料领域的应用为背景开展工艺及性能基础性研究。经体系筛选与优化,得到适合微波固化的双马树脂体系;通过研究树脂的微波固化特性,成功制备得到力学性能较好的耐高温双马树脂浇注体与复合材料,为微波固化技术在双马树脂基复合材料领域的应用提供理论与实践指导。本文研究包括:(1)为得到适宜微波固化的双马树脂,结合工程适用性并以树脂的微波固化效率为目标,通过正交试验法研究树脂配方工艺参数对树脂微波固化效率的影响,得到最优配方工艺为:BDM/DABPA摩尔比0.8:1,BDM与DABPA在135°C下预聚60min,DCP用量为BDM/DABPA总质量的1.5 wt%;并得到各参数对微波固化效率影响强弱依次为:预聚时间、DCP用量、BDM/DABPA用量比。其主要原因为:预聚时间延长使树脂放热峰更加尖锐、反应更快,同时预聚生成的中间体可能具有更高的反应活性;DCP用量增加,产生更多自由基加速反应;BDM与DABPA在微波下反应性接近。另外,通过改变微波工艺参数,研究树脂的微波固化工艺特性,结果表明:微波功率需要达到一定的阈值(450W)才能使树脂开始交联固化;且随反应进行,固化速率先增加后降低。(2)为对比树脂微波固化与热固化性能,制备浇注体并研究其玻璃化转变温度、弯曲以及拉伸性能,结果表明:微波固化可以大幅度地缩短工艺时间,比热固化缩短87%;微波固化能保持树脂的耐热性,微波固化后玻璃化温度为261.92°C,热固化后为259.85°C;微波固化使树脂模量略有增加,强度轻微降低,微波固化物弯曲模量和拉伸模量提高4.8%与2.3%,弯曲强度和拉伸强度降低7.2%与4.1%。强度降低的主要原因是微波固化功率大、反应速度快、交联度更高,导致固化物模量、脆性增大。(3)为对比复合材料微波固化与热固化性能,通过自行搭建滚筒缠绕系统获得预浸料并制备双马/玻纤层合板,研究其含胶量、弯曲、拉伸以及短梁剪切性能,结果表明:在大幅度缩短固化时间的同时,微波固化使复合材料模量增加、强度降低。微波固化[0/90]3s层合板弯曲强度和拉伸强度降低7.7%与6.0%,拉伸模量提高7.6%;[0]6s层合板短梁剪切强度降低10%。其主要原因为:微波固化得到的脆性基体使模量增加,但它难以阻止裂纹扩展并导致强度降低。
[Abstract]:Based on the application of microwave curing technology in the field of bismaleic resin matrix composites, the basic research of technology and properties is carried out in this paper. The bismalone resin system suitable for microwave curing was obtained by screening and optimizing the system. By studying the microwave curing characteristics of the resin, the high temperature resistant bismaleic resin casting body and composites were successfully prepared, which provided theoretical and practical guidance for the application of microwave curing technology in the field of bismaleic resin matrix composites. The main contents of this paper are as follows: (1) in order to obtain bismaleic resin suitable for microwave curing, combined with engineering applicability and aiming at the microwave curing efficiency of resin, the effects of resin formulation parameters on microwave curing efficiency were studied by orthogonal test. The optimum formulation was obtained as follows: the molar ratio of BDM/DABPA to DABPA was 0.8: 1g / min and the amount of prepolymerized 60min DCP was 1.5 wt%; at 135 掳C with the total mass of BDM/DABPA. The effects of different parameters on microwave curing efficiency were obtained as follows: prepolymerization time, DCP dosage and BDM/DABPA dosage ratio. The main reasons are as follows: prolonged prepolymerization time makes the exothermic peak of resin sharper and the reaction faster, and the intermediate formed by prepolymerization may have higher reaction activity, and the amount of DCP increases, and more free radical accelerates the reaction. The reactivity of BDM and DABPA is similar under microwave. In addition, the microwave curing characteristics of the resin were studied by changing the microwave technological parameters. The results showed that the microwave power needed to reach a certain threshold (450 W) to make the resin begin crosslinking and curing. With the reaction, the curing rate increased first and then decreased. (2) compared with the properties of microwave curing and thermal curing of resin, the casting materials were prepared and their glass transition temperature, bending and tensile properties were studied. The results show that microwave curing can greatly shorten the processing time and specific heat curing can shorten 87%. The heat resistance of the resin can be maintained by microwave curing. The glass transition temperature is 261.92 掳C after microwave curing and 259.85 掳C after heat curing. Microwave curing slightly increased the modulus of resin and slightly decreased its strength. The flexural modulus and tensile modulus of microwave cured compounds increased by 4.8% and 2.3%, and the flexural strength and tensile strength decreased by 7.2% and 4.1% respectively. The main reasons for the decrease of strength are that the microwave curing power is high, the reaction rate is fast, and the crosslinking degree is higher, which leads to the consolidation modulus and brittleness increase. (3) comparing the properties of microwave curing and thermal curing of composites, The prepreg was prepared by self-built drum winding system, and the adhesive content, bending, tensile and shear properties of the short beam were studied. The results showed that the curing time was greatly shortened while the curing time was greatly shortened. Microwave curing increases the modulus and decreases the strength of the composite. The bending strength and tensile strength of [0 / 90] 3 s laminates were decreased by 7. 7% and 6. 0%, the tensile modulus increased by 7. 6%, and the shear strength of [0] 6 s laminated short beams decreased by 10%. The main reason is that the brittle matrix obtained by microwave curing increases the modulus, but it is difficult to prevent the crack growth and lead to the decrease of the strength.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB33;TQ320.1
本文编号：2391530
[Abstract]:Based on the application of microwave curing technology in the field of bismaleic resin matrix composites, the basic research of technology and properties is carried out in this paper. The bismalone resin system suitable for microwave curing was obtained by screening and optimizing the system. By studying the microwave curing characteristics of the resin, the high temperature resistant bismaleic resin casting body and composites were successfully prepared, which provided theoretical and practical guidance for the application of microwave curing technology in the field of bismaleic resin matrix composites. The main contents of this paper are as follows: (1) in order to obtain bismaleic resin suitable for microwave curing, combined with engineering applicability and aiming at the microwave curing efficiency of resin, the effects of resin formulation parameters on microwave curing efficiency were studied by orthogonal test. The optimum formulation was obtained as follows: the molar ratio of BDM/DABPA to DABPA was 0.8: 1g / min and the amount of prepolymerized 60min DCP was 1.5 wt%; at 135 掳C with the total mass of BDM/DABPA. The effects of different parameters on microwave curing efficiency were obtained as follows: prepolymerization time, DCP dosage and BDM/DABPA dosage ratio. The main reasons are as follows: prolonged prepolymerization time makes the exothermic peak of resin sharper and the reaction faster, and the intermediate formed by prepolymerization may have higher reaction activity, and the amount of DCP increases, and more free radical accelerates the reaction. The reactivity of BDM and DABPA is similar under microwave. In addition, the microwave curing characteristics of the resin were studied by changing the microwave technological parameters. The results showed that the microwave power needed to reach a certain threshold (450 W) to make the resin begin crosslinking and curing. With the reaction, the curing rate increased first and then decreased. (2) compared with the properties of microwave curing and thermal curing of resin, the casting materials were prepared and their glass transition temperature, bending and tensile properties were studied. The results show that microwave curing can greatly shorten the processing time and specific heat curing can shorten 87%. The heat resistance of the resin can be maintained by microwave curing. The glass transition temperature is 261.92 掳C after microwave curing and 259.85 掳C after heat curing. Microwave curing slightly increased the modulus of resin and slightly decreased its strength. The flexural modulus and tensile modulus of microwave cured compounds increased by 4.8% and 2.3%, and the flexural strength and tensile strength decreased by 7.2% and 4.1% respectively. The main reasons for the decrease of strength are that the microwave curing power is high, the reaction rate is fast, and the crosslinking degree is higher, which leads to the consolidation modulus and brittleness increase. (3) comparing the properties of microwave curing and thermal curing of composites, The prepreg was prepared by self-built drum winding system, and the adhesive content, bending, tensile and shear properties of the short beam were studied. The results showed that the curing time was greatly shortened while the curing time was greatly shortened. Microwave curing increases the modulus and decreases the strength of the composite. The bending strength and tensile strength of [0 / 90] 3 s laminates were decreased by 7. 7% and 6. 0%, the tensile modulus increased by 7. 6%, and the shear strength of [0] 6 s laminated short beams decreased by 10%. The main reason is that the brittle matrix obtained by microwave curing increases the modulus, but it is difficult to prevent the crack growth and lead to the decrease of the strength.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TB33;TQ320.1
【参考文献】
相关期刊论文 前1条
1 李敏,张佐光,仲伟虹,潘贻珊;聚酰亚胺树脂研究与应用进展[J];复合材料学报;2000年04期
，本文编号：2391530
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