饱和聚酯树脂的生产工艺
发布日期：2024-01-23
阅读量：1431
饱和聚酯树脂的生产工艺过程由几个相对独立的单元操作所组成，一般可分为以下几个单元操作，投料、反应、中控、稀释、压滤。
①投料开始生产的第一步，这个步骤最重要是：投料准确；按工艺要求的顺序投料。同样的配方不同的投料次序会对产品造成影响，多元醇和多元酸熔点各异、熔化快慢不同，最合适的次序是将容易熔化的多元醇分为两份分别投在反应釜底部和上部，多元酸投在物料的中间，升温时多元醇与多元酸可尽快融合为均相，使反应顺利进行。
②反应树脂合成牵涉到的化学反应是酯化反应和缩聚反应，反应工艺、反应温度、催化剂的类型都对反应进程有影响。从反应控制上看，要及时将反应水从反应签中脱出，使反应朝我们控制的方向进行，避免副反应的发生。
③中控通过取样后的检验来衡量反应是否达到了规定的要求，这一过程要求取样后用来稀释的溶剂，与生产时对稀溶剂成分完全相同，以保证测试准确。样品溶解时，溶剂会挥发，溶解后应复称，减少的分量用稀释溶剂补足，可提高测试的准确性。
④稀释反应达到终点后，放料到对稀釜中稀释，另外，反应釜中应加入部分强溶剂洗锅，将黏附在反应釜内壁的树脂洗下，这一步骤的要求是搅拌均匀。
⑤压滤原料引入与反应产生的杂质都留在树脂体系中，但聚酯树脂加工的涂料都有细度要求，因此要用过滤的方法将树脂中的杂质滤掉，保证树脂产品清澈透明。
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