本文综合介绍了不饱和聚酯复合材料用低收缩添加剂的发展历程。分别介绍了非极性低收缩添加剂、极性低收缩添加剂及组合型低收缩添加剂的作用机理，从机理上分析了达到优良低收缩效果及均匀内着色的条件。预测了低收缩添加剂的发展方向。
The article describes the history of LPA used in Up resins, introduces the acting mechanism of polar and non-polar and composite LPA, analyzes how to get a good result in low shrinkage and colouring and predicts their developing t rend.
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