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采用流变仪研究了固化反应温度、时间以及增韧剂和增稠剂加入量对酚醛树脂流变特性的影响,并测试了玻璃纤维增强酚醛预浸料与Nomex蜂窝芯共固化成型后玻璃纤维/酚醛-Nomex蜂窝夹层结构复合材料的板-芯黏接性能。结果表明:改性后酚醛树脂在高温时的黏度提高较多,流动性得到了有效改善,所得预浸料与Nomex蜂窝芯的界面黏接明显增强,并且当增韧剂和增稠剂的加入量与纯酚醛树脂的质量比分别为5%和3%时,所制备出的夹层板的滚筒剥离强度达到15N·mm/mm以上,改性后酚醛树脂及其预浸料具有了一定程度的自黏附特性。此外,在共固化工艺中采用合适的升温制度,可以进一步提高玻璃纤维/酚醛-Nomex蜂窝夹层结构复合材料的板-芯黏接强度。
The rheological properties of phenolic resin were investigated by using rheometer. The effects of curing temperature and time, rheological properties of toughening agent and thickener on the rheological properties of phenolic resin were investigated. The co-curing of glass fiber reinforced phenolic prepreg with Nomex honeycomb core / Phenolic-Nomex honeycomb sandwich composite board-core bonding properties. The results showed that the viscosity of the modified phenolic resin increased more at high temperature, the fluidity was effectively improved, and the interfacial adhesion between the obtained prepreg and Nomex honeycomb core was obviously enhanced. When toughening agent and thickener were added When the mass ratio of pure phenolic resin to pure phenolic resin was 5% and 3%, respectively, the peel strength of the prepared sandwich plate reached 15N · mm / mm or above. The modified phenolic resin and its prepreg had a certain degree of Self-adhesive properties. In addition, a suitable temperature-raising system in the co-curing process can further improve the board-core bonding strength of the glass fiber / phenolic-Nomex honeycomb sandwich composite.