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对191#不饱和聚酯树脂进行了自然曝晒老化、人工热氧加速老化及人工氙灯加速老化试验,并对老化前后试样的外观形貌、光泽度、黄色指数、拉伸强度和弯曲强度进行了研究。实验结果表明,随着加速老化的不断进行,试样表面会出现泛黄、失光率增大和裂纹等现象,强度呈先增后降的趋势,弯曲强度由20 MPa(未老化时)增至最大值40 MPa(热氧老化60 d或氙灯老化45 d),拉伸强度由113 MPa(未老化时)增至最大值125 MPa(氙灯老化30 d)和128 MPa(热氧老化60 d);老化方式不同,老化前后试样的性能变化也不相同,即失光率对热氧老化更敏感、强度对紫外光老化更敏感;西部曝晒180 d,不饱和聚酯树脂仍处于后固化阶段,但强度已开始下降,下降程度与曝晒地区有关,变化最明显的是新疆尉犁地区,弯曲强度由最大值40 MPa(自然曝晒120 d)降低至35 MPa(自然曝晒180 d)。
191 # unsaturated polyester resin was subjected to natural exposure aging, artificial thermal oxygen accelerated aging and artificial xenon lamp accelerated aging test. The appearance, gloss, yellowness index, tensile strength and flexural strength of the samples before and after aging Study. The experimental results show that along with the accelerated aging, the yellowing, the increase of the gloss loss rate and the crack appear on the sample surface, the strength increases first and then decreases, the bending strength increases from 20 MPa (unaged) The maximum tensile strength is 40 MPa (hot oxygen aging for 60 days or xenon lamp aging for 45 days), and the tensile strength increases from 113 MPa (unaged) to 125 MPa (xenon lamp aged 30 days) and 128 MPa (hot oxidized 60 days) ; Different aging methods, the performance of the sample before and after aging changes are not the same, that is, the rate of loss of light on the thermal aging more sensitive to UV aging is more sensitive; western exposure 180 d, unsaturated polyester resin is still in the post-curing stage , But the intensity has begun to decline. The degree of decrease is related to the exposure area. The most obvious change is the Yuli area in Xinjiang. The bending strength decreases from 40 MPa (natural exposure 120 days) to 35 MPa (180 days natural exposure).