Mo Qiufeng, Huang Yifeng, Ma Lanyu, Lai Wenqin, Zheng Yihua, Li Yanming, Xu Mengxue, Huang Zhimin
Guangxi Academy of Sciences, Nanning 530000, China.
Polymers (Basel). 2022 Jun 27;14(13):2598. doi: 10.3390/polym14132598.
Microwave curing technology has been widely used in resin and its composite materials. In order to study its effect for curing unsaturated polyester resin (UPR) composites containing calcium carbonate (CaCO) filler, this paper first investigated the influence of microwave power and microwave irradiation time on the curing characteristics of UPR. Then, CaCO particles were added to the UPR to investigate the microwave curing effect of the UPR composites containing the CaCO. The results showed that microwave irradiation could heat the UPR sample evenly, and rapidly cause the chain growth reaction, thus greatly shortening the curing time. The curing degree and products of the samples after microwave curing were consistent with that of the thermal curing. The addition of CaCO particles could increase the heating rate of the UPR composites, which would accelerate the curing rate of the UPR. However, higher microwave power could lead to pore defects inside the UPR composites with higher CaCO content, resulting in a lower strength. Thus, the compactness of the samples should be improved by reducing the microwave power and prolonging the microwave treatment time.
微波固化技术已广泛应用于树脂及其复合材料。为研究其对含碳酸钙（CaCO）填料的不饱和聚酯树脂（UPR）复合材料的固化效果，本文首先研究了微波功率和微波辐照时间对UPR固化特性的影响。然后，向UPR中添加CaCO颗粒，研究含CaCO的UPR复合材料的微波固化效果。结果表明，微波辐照能使UPR样品均匀受热，并迅速引发链增长反应，从而大大缩短固化时间。微波固化后样品的固化程度和产物与热固化一致。CaCO颗粒的加入可提高UPR复合材料的加热速率，进而加速UPR的固化速率。然而，较高的微波功率会导致CaCO含量较高的UPR复合材料内部出现孔隙缺陷，从而降低强度。因此，应通过降低微波功率和延长微波处理时间来提高样品的致密性。
