Abstract: Liquid thermosetting phenolic resin releases volatile organic compounds such as formaldehyde and free phenols during use,polluting the environment,and its viscosity increases during storage,affecting the stability of high manganese steel sliding gates.The magnesium spinel sliding gates were produced using tabular corundum and fused spinel as aggregates,introducing dioctyl phthalate as a reinforcing agent and 4 mass% thermoplastic phenolic resin powder as a binder.The effects of dioctyl phthalate additions (0,1%,1.2%,1.4%,and 1.6% by mass) on the structure and hot properties of the sliding gates were studied.The results show that the introduction of dioctyl phthalate increases the surface activity of the particles,improves the adhesion and toughness of the thermoplastic phenolic resin powder,and reduces the porosity of the sliding gates.When the addition of dioctyl phthalate is 1.2%,the sliding gate structure is dense,and the hot mechanical properties and erosion resistance against molten steel are significantly improved.The average service life of the sliding gates in a 150 t ladle continuous casting machine reached 2.8 heats,exceeding the average service life of 1.6 heats for the sliding gates before improvement.

Key words: dioctyl phthalate, phenolic resin, high manganese steel, sliding gate, erosion resistance against molten steel

摘要： 液态热固酚醛树脂在使用中释放甲醛、游离酚等挥发性有机化合物污染环境,存放时黏度变大,影响高锰钢滑板的质量。以板状刚玉、电熔尖晶石为骨料,引入邻苯二甲酸二辛酯为增强剂,4%(w)的热塑性酚醛树脂粉为结合剂,制备了高锰钢用镁尖晶石滑板。研究邻苯二甲酸二辛酯加入量(加入质量分数分别为0、1%、1.2%、1.4%和1.6%)对滑板结构及高温性能的影响。结果表明:加入邻苯二甲酸二辛酯使颗粒料表面活性增加,改善了热塑性酚醛树脂粉的黏结性、韧性,减少了滑板材料的气孔;当邻苯二甲酸二辛酯的外加量为1.2%(w)时,滑板结构致密,高温力学性能和抗钢液冲刷性能得到显著提高,在150 t钢包连铸机上平均使用次数为2.8次,超过了改进前滑板的平均使用寿命(1.6次)。

关键词: 邻苯二甲酸二辛酯, 酚醛树脂, 高锰钢, 滑板, 抗钢液冲刷性