聚乙二醇改性环氧乳液碳纤维上浆剂的研制

Preparation of PEG modified epoxy emulsion as sizing agents for carbon fiber

用聚乙二醇(PEG)在催化剂过硫酸钾作用下与环氧树脂反应,制得自乳化环氧树脂乳液。通过红外光谱表征改性环氧的结构,并比较不同实验方案下乳液的稳定性,探讨了反应原料、合成工艺等因素对实验结果的影响,确定了最佳实验方案;用热分析实验表征上浆剂的热稳定性,接触角测试表征上浆剂乳液的浸润性,单丝碎裂实验测定界面剪切强度。结果表明,使用双酚A环氧树脂及PEG1000在80～120℃反应制得的乳液稳定性最好,上浆剂的热稳定性和浸润性良好。用实验制得的乳液对碳纤维上浆,单丝界面剪切强度比上浆前提高33.48%,碳纤维毛丝量减少。

The epoxy was modified by polyethylene glycol （PEG） to synthesize self-emulsifying epoxy emulsion, which was characterized by FTIR to confirm its structure. The stability of the epoxy emulsion stemmed in different experimental circumstances was investigated to analyze the effects of the reactants, process and other factors on the final products, and to reveal the optimal process parameters. The thermal properties of the sizing agents were characterized by TG and DSC, the wetting property of the sizing agents were characterized through contact angle test, and the IFSS （interfacial shear strength） of a single fiber was characterized by a single fiber fragmentation test. The results show that the emulsion prepared by reaction of the epoxy and PEG- 1000 at 80-120 ℃ has the best stability. The sizing agents has good thermal stability and wetting property. The fuzz amount of carbon fiber decreases and the IFSS （interracial shear strength） increases by 33. 48% after sizing with the epoxy emulsion.