摩阻材料用亚麻油改性酚醛树脂的试验

为得到高性能的摩阻材料，将苯酚和亚麻油在酸性条件下反应，然后在碱性条件下与甲醛反应合成亚麻油改性酚醛树脂。利用红外光谱分析、热分析、力学性能测试等手段研究亚麻油对酚醛树脂的改性作用，并对亚麻油改性酚醛树脂作基体的摩阻材料的摩擦磨损性能和力学性能进行测试。结果显示，改性树脂的耐热性、粘结性和韧性较未改性的树脂得到了提高。改性树脂的切应力为18.5 MPa，冲击强度为120.2 kJ?m–2，洛氏硬度为111.2 HRR；摩阻材料摩擦性能稳定，从热衰退敏感的250～350 ℃温度变化范围内，摩擦因数仅下降了0.03，仍保持在0.39的水平；温度为200 ℃时，磨损率仅为0.30 cm3?N–1?m–1，冲击强度达780 kJ?m–2，洛氏硬度为113.2 HRR。研究表明亚麻油改性酚醛树脂有望成为高性能摩阻材料的树脂基体。

Experimentation on Linseed Oil Modified Phenolic Resin as Friction Material

In order to obtain high performance friction materials, linseed oil modified phenolic resin is synthesized via two steps: firstly, phenol and linseed oil react under acidic condition; secondly, the resultant intermediate reacts with formaldehyde under basic condition. The modification effect of linseed oil on phenolic resin is studied by means of infrared spectrum analysis, TG-DSC analysis and mechanical property test. The friction, abrasion and mechanical properties of the friction material starting from linseed oil modified phenolic resin are tested. The results show that the heat-resistance, cohesiveness and toughness of the modified resin are superior to those of the unmodified resin. The shear stress of the modified resin is 18.5 MPa, the impact strength 120.2 kJ?m–2, and Rockwell hardness 111.2 HRR. The friction coefficient values are all above 0.39 and decreased by 0.03 as increasing temperature from 250 to 350 ℃. At a temperature of 200 ℃, the wear rate is 0.30 cm3?N–1?m–1, the impact strength 780 kJ?m–2, and the Rockwell hardness 113.2 HRR. The results indicate that linseed oil modified phenolic resin is hopeful to be the resin matrix of high performance friction material.