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本文提出了描述微粒填料对热固性聚合物的热传导和固化特性的影响的一个模型。它假设反应动力学并不由于填料的添加而改变,而且通过“球状掺杂模型”可充分地描述复合材料的热特性。这模型用来研究填料对若干重要模制特性的影响:即时间-温度分布(曲线)、峰值温度、反应程度和胶凝时间。提供了典型的聚酯树脂不同的填料含量和填料类型(玻璃、碳酸钙和铝)的固化结果。结果表明: ·填料含量较高时,在不会引起热降低的情况下,增加模制温度,可以缩短模制周期。 ·随着填料的增加,沿模型厚度方向固化深度变化很大。在低填科含量时,固化从中心向模壁进行;在较高填料含量时,固化从模壁向模型中心进行。
This paper presents a model describing the effect of particulate fillers on the heat conduction and curing characteristics of thermosetting polymers. It assumes that the reaction kinetics does not change due to the filler addition, and that the “spherical doping model” adequately describes the thermal properties of the composite. This model was used to study the effect of fillers on several important molding properties: time-temperature profile (curve), peak temperature, degree of reaction, and gel time. Provides typical polyester resin with different filler content and filler type (glass, calcium carbonate and aluminum) curing results. The results showed that: • When the filler content is high, the molding cycle can be shortened by increasing the molding temperature without causing the heat reduction. As the filler increases, the depth of cure varies greatly along the thickness of the mold. At low fill levels, curing proceeds from the center to the mold wall; at higher filler contents, curing proceeds from the mold wall toward the center of the mold.