高耐热水性硅钢片漆的制备及性能研究

Preparation and Performance of High Heat-resistant Water-soluble Silicon Steel Sheet Paint

为了提高水溶性硅钢片漆的耐热性,以水溶性聚酯树脂为基体,不同配比的沉淀BaSO_(4)和无机胶黏剂制成复合无机填料后制备具有优异耐热性能的水溶性硅钢片漆,并对硅钢片漆的力学性能、电气强度和耐热性进行分析。结果表明:当复合无机填料加入基体树脂中分散均匀后漆膜的铅笔硬度达到9H,附着力等级达到1级,随着复合无机填料中BaSO_(4)添加比例的上升,漆膜的电气强度和体积电阻率以及耐热性能都呈先上升后下降的趋势,当BaSO_(4)与无机胶黏剂的质量比为5∶2时,漆膜的电气强度达到最高280 kV/mm左右,体积电阻率高达1.5×10^(16)Ω·m。最高初始热分解温度为273℃左右,最终残留率为77%,辐照前后性能基本无变化,富兰克林烧损实验后尺寸稳定以及表面电阻稳定,说明在高温下仍保持绝缘性能。

In order to improve the heat resistance of the water-soluble silicon steel sheet paint, we prepared watersoluble silicon steel sheets with excellent heat resistance, by adding composite inorganic fillers made of different proportions of precipitated BaSO_(4) and inorganic adhesives into water-soluble polyester resin matrix. The mechanical properties, electric strength, and heat resistance of the paint were analyzed. The results show that when the composite inorganic filler disperse in the matrix resin evenly, the pencil hardness reaches to 9 H, and the adhesion achieves level 1. With the increase of the proportion of BaSO_(4) in the composite inorganic filler, the electrical strength, volume resistivity, and heat resistance increase at first and then decrease. When the mass fraction of BaSO_(4) and inorganic adhesive is 5: 2, the electrical strength of the paint film reaches a maximum of about 280 kV/mm, and the volume resistivity is as high as 1.5×10^(16)Ω ·m. The maximum initial thermal decomposition temperature is about 273℃, and the final residual rate is 77%. The performance of the paint is basically unchanged after irradiation, it has stable dimensions and surface resistance after Flinklin burning, it is indicated that the insulating performance is still maintained at high temperature.