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固体胶是怎样做的
更新时间: 2020-08-15 00:00:00  

固体胶做法:

1、在三口烧瓶中加入6、5克聚乙烯醇、70毫升去离子水,开启搅拌,并加热,控温在90摄氏度,直至聚乙烯醇全部溶解 ;

2、降温到85摄氏度,在三口烧瓶中滴加浓溶液氯化氢,将聚乙烯醇水溶液的酸碱度调为2到3;

3、量取2、5毫升甲醛水溶液,用滴液漏斗缓缓地将其滴入三口烧瓶中,继续搅拌;

4、当溶液中有气泡或絮状物产生时,停止加热,并迅速滴加6摩尔氢氧化钠溶液,调整酸碱度为7到8;

5、分两批将3、5克尿素加入胶液中,保温反应30分钟;

6、在聚乙烯醇缩甲醛胶中加入7克甘油,搅拌均匀后加入6克硬脂钠,混合均匀;

7、用6摩尔氢氧化钠溶液调节酸碱度至9,转移至小烧杯,冷却后得到固体胶。

关键词: 固体 怎样

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