中国胶粘剂

针对乙烯-醋酸乙烯共聚物(EVA)泡沫板大厚度和耐海洋环境使用的需求，对环氧胶粘剂进行改性。本文采用端羧基丁腈橡胶(CTBN)和端羟基聚苯醚(PPE)对环氧树脂(EP)进行增韧改性，聚酰胺和聚醚胺为固化剂，研究了CTBN/PPE不同添加量对改性环氧胶粘剂的力学性能和粘接性能的影响，并对其力学性能和凝胶时间进行测定。研究结果表明：CTBN/PPE改性环氧胶粘剂能够明显促进EP的固化。当CTBN/PPE的质量添加量为15%时，改性EP体系的弯曲强度达到最大值62.5 MPa，冲击强度达到最大值19.1 kJ/m²，比未改性的EP体系分别提高了66.4%和65.3%。改性环氧胶粘剂对EVA-EVA板材进行粘接时，均表现出较好的剥离强度和拉剪强度，经过70℃人工海水浸泡后仍保持较好的剥离强度；对玻纤-玻纤复合板进行粘接，当CTBN/PPE添加量为15%时，拉剪强度达到了最大值17.2 MPa，比未改性EP的拉剪强度提高了81.2%。

The epoxy adhesive was modified to meet the requirements of ethylene-vinyl acetate copolymer(EVA) foam board for large thickness and marine environment resistance.In this paper,carboxyl terminated nitrile rubber(CTBN) and hydroxyl terminated polyphenylene ether(PPE) were used to toughen epoxy resin(EP).Polyamide and polyether amine were used as curing agents.The effects of different addition amounts of CTBN/PPE on the mechanical properties and bonding properties of modified epoxy adhesive were studied,and its mechanical properties and gel time were measured.The research results showed that CTBN/PPE modified epoxy adhesive could significantly promote the curing of EP. When the mass addition of CTBN/PPE was 15%,the flexural strength of modified EP system reached its maximum value of 62.5 MPa,and the impact strength reached its maximum value of 19.1 kJ/m²,which was 66.4% and 65.3% higher than the unmodified EP system,respectively.When modified epoxy adhesive was used to bond EVA-EVA boards,it exhibited good peel strength and tensile shear strength,and maintained good peel strength even after immersion in artificial seawater at 70 ℃.When bonding the fiberglassfiberglass composite panels,the tensile shear strength reached its maximum value of 17.2 MPa when the CTBN/PPE addition amount was 15%,which was 81.2% higher than the tensile shear strength of unmodified EP.