针对分子量、羟值及三元酸用量对硅钢片漆性能的影响，设计了一组三因素三水平的正交实验，分析3个因素对水溶性硅钢片漆的水溶性、凝胶化时间和漆膜力学性能的影响。结果表明：当分子量为1900，羟值为7%，偏苯三酸酐为原料总量的8.5%时，可得到硅钢片漆最佳的水性聚酯树脂结构。制备的硅钢片漆固体含量为40%，23℃下粘度为45 s，210℃下凝胶化时间为91 s，水溶性为6.4倍，pH值为7.2，漆膜硬度为9H，附着力等级为1级，韧性等级为1级，体积电阻率为1.5×1013Ω·m，表面电阻为1.2×1013Ω。
In view of the effects of molecular weight and hydroxyl value of polyester and trimellitic anhydride (TMA) dosage on the properties of lamination coating, we designed an orthogonal experiment of three factors and three levels. The effects of three factors on the water-soluble and gel time of the lamination coating and the mechanical properties of the film were analyzed. The results show that when the molecular weight is 1 900, hydroxyl value is 7%, and the TMA dosage is 8.5%, the best structure of polyester to prepare water-soluble lamination coating is obtained. The prepared lamination coating have 40% of the solid content, 45 s of the viscosity at 23℃, 91 s of the gel time at 210℃, 6.4 times of the water-soluble, 7.2 of the pH value, 9H of the film hardness, class 1 of the adhesion level, 1.5×1013Ω·m of the volume resistivity, and 1.2×1013Ω of the surface resistance.
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