摘要
环氧树脂因其优良的稳定性而在电气绝缘领域被广泛应用,但其高度交联结构使得退役绝缘材料的降解处理面临困难。为加速降解,需对原材料进行高效的预处理。该文采用环保溶胀剂二丙二醇二甲醚(DMM)及低浓度高锰酸钾溶液对环氧树脂进行预处理,通过设置不同的处理方式共获得45组试验样本,并对试验样本进行了热稳定性、化学交联性及热机械性能等方面的研究。分析得出,DMM破坏了环氧玻璃纤维的物理结构,同时DMM分子与环氧体系通过氢键作用键合,形成疏松溶胀体系,而高锰酸钾溶液氧化了树脂中的交联基团。将两种试剂联合使用,不仅可有效地瓦解物理结构与化学交联,同时能够保留富羟基膨松粉末状产物,为后续利用黑曲霉菌进行降解提供强有力的培养载体,切实提高降解效率。
Epoxy resin,which has been widely and extensively applied in the field of electrical insulation because of its outstanding structural stability,encounters significant hurdles in the recycling process.This is primarily attributed to its highly cross-linked network structure.Traditional physical and chemical pretreatment methods often involve harsh conditions,high costs,or environmental risks.In order to accelerate the degradation,this paper proposes a synergistic pretreatment strategy.It makes use of Dipropyleneglycol dimethyl ether(DMM),a green solvent,and low-concentration KMnO4 to disrupt the structural integrity of the epoxy resin under relatively mild operating conditions.A total of 45 experimental groups were meticulously and systematically designed to assess the impacts of various parameters.The experimental parameters were set as follows:reaction temperature 85~99℃,duration 30~90 min;KMnO4 solutions at 0.1 and 0.5 mol/L;and treatment modes—DMM and KMnO4 were applied either individually or in combination.Thermogravimetric analysis(TGA),differential scanning calorimetry(DSC),Fourier-transform infrared spectroscopy(FTIR),dynamic mechanical analysis(DMA),and scanning electron microscopy(SEM)were utilized to evaluate thermal stability,cross-linking density,mechanical properties,and morphological changes.Meanwhile,this paper explores the action mechanisms of different treatment methods.According to the experimental results,this pretreatment method significantly reduces the physical stability and chemical cross-linking degree of the epoxy resin.At the same time this paper proposes that the mechanism of action of DMM is to penetrate into the structure of the epoxy resin through swelling,making the original system loose.At the same time,it forms a new system with the epoxy resin through hydrogen bonding,thereby reducing its physical stability.Potassium permanganate will form different oxidation products under different reaction conditions,and specific reaction pathways are proposed in this paper.When applied to Aspergillus niger mediated biodegradation,pretreated samples exhibited accelerated degradation.After 30 days,the Tg of combined-pretreated samples decreased to 40~45℃,compared to 90~95℃for untreated controls.Pretreatment makes the surface of the sample rough and rich in hydroxyl groups,which enhances the attachment and reproduction of Aspergillus niger.
作者
杨世芳
郭奕良
刘云鹏
王仲
佟孟洋
储子安
秘吉喆
Yang Shifang;Guo Yiliang;Liu Yunpeng;Wang Zhong;Tong Mengyang;Chu Zian;Mi Jizhe(Department of Electrical Engineering North China Electric Power University,Baoding 071000 China;College of Electrical Engineering Sichuan University,Chengdu 610000 China;State Grid Baoding Electric Power Supply Company,Baoding 071051 China)
出处
《电工技术学报》
北大核心
2026年第3期794-806,共13页
Transactions of China Electrotechnical Society
基金
国家自然科学基金(52207154)
智能电网国家科技重大专项项目(2025ZD0808800)子课题(2025ZD0808801)
河北省自然科学基金(E2023502087)
中央高校基本科研业务费专项资金(2025MS111)资助项目。
关键词
二丙二醇二甲醚溶胀剂
溶胀机理
高锰酸钾溶液
氧化机理
降解预处理
Dipropylene glycol dimethyl ether swelling agent
swelling mechanism
KMnO4 solution
oxidation mechanism
degradation pretreatment
