象马口铁这类经表面处理的薄钢板,在搬运或加工时,表面会损伤或弄脏。为此,须在它表面涂上一层防护油。对这种防护的要求是:涂油操作简便,能长期保持润滑性,无毒可用于食品,以及成本低等。以前所使用的防护油,有棉子油、二辛基癸二酸酯(以下简称DOS)等,这些油在抗斑性、涂装性方面仍存在着问题。比如说DOS,虽然能较长时间地保持润滑性,涂装时很少产生局部性涂装缺陷,涂膜的粘附性也好,但涂油量 Surface-treated sheets of steel, such as tinplate, are damaged or soiled on handling or processing. To this end, it must be coated with a layer of protective oil. The requirements of this protection are: oiled easy operation, long-term maintain lubricity, non-toxic for food, and low cost. Previously used protective oil, a cottonseed oil, dioctyl sebacate (hereinafter referred to as DOS), etc., these oils in the anti-spotting, coating there are still problems. For example, DOS, while able to maintain long-term lubrication, coating rarely produce localized paint defects, coating adhesion is good, but the amount of oil