醇酸树脂工艺流程简述
发布日期：2018-11-12
阅读量：8877
以下为醇酸树脂合成主要采用溶剂法生产。溶剂法中常用二甲苯的蒸发带出酯化水，经过分水器的油水分离后重新回流反应釜，如此反复，推动聚酯化反应的进行，生产醇酸树脂。
先将单体全部加入反应釜，加入少量抗氧剂，开慢速搅拌（先慢后快原则，使聚合平稳，顺利进行），用2小时升温到180℃；保温1小时。然后用2小时升温到200-220℃，保温2小时，抽样测酸值，达标可进行下一步，如不合格继续保温，每30分钟抽样复测。聚酯化易采取逐步升温工艺，保持正常出水速率，应避免反应过于剧烈造成物料夹带，影响单体配比和树脂结构。保温温度及时间随配方而定，而且与油品和油度有关。
达到终点后，停止加热，冷却后蒋兑稀溶剂缓慢加入反应釜中。聚酯反应要关注出水速率和出水量，并按规定时间取样，测定酸值和粘度，达到规定后降温，稀释，经过过滤，制得漆料。
最后搅拌均匀，60-70℃过滤，收于贮罐。
醇酸树脂合成主要设备
滴加罐→反应釜→冷凝器→分水器→过滤器→灌装机
加热系统：导热油加热，可选夹套反应釜/外盘管反应釜
冷却系统：冷水冷却
搅拌速度先慢后快，需要配变频器。
专栏：技术交流
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