低温固化阴极电泳漆的制备及性能

Preparation and performance of low temperature curing cathodic electrophoresis paint

利用乙二醇丁醚和异辛醇对4,4'-亚甲基双异氰酸酯(MDI)进行封闭,并与胺化后的环氧树脂合成了性能及工艺稳定的低温固化阴极电泳漆。考察了封闭剂种类、封闭反应时间和电泳电压对固化温度及漆膜性能的影响,并对固化剂及漆膜进行FT-IR、SEM和TGA表征。结果表明,当选用乙二醇丁醚为封闭剂,控制封闭反应时间为4 h、电泳电压为120 V的工艺下得到的漆膜可在150℃固化20 min,所得漆膜外观光滑、平整,测得其硬度为3H,附着力为0级,柔韧性为1 mm,冲击强度为50 kg·cm,耐盐、耐酸碱性均达到48 h。

4,4’-Methylene diisocyanate（ MDI） is completely closed by ethylene glycol butyl ether and isooctanol,and then reacts with aminated epoxy resin to synthesize low temperature curing cathodic electrophoresis paint with stable properties and process. The effects of the varieties of closing agent,closing reaction time and electrophoresis voltage on the curing temperature and film performance of paint are studied. Both the curing agent and paint film are characterized via FT-IR,SEM and TGA. The results show that the prepared paint film can be cured at 150℃ in 20 min when ethylene glycol butyl ether is used as closing agent,closing reaction time is controlled in 4 h and the electrophoresis voltage is120 V. The paint film obtained has smooth and flat appearance. Its hardness,adhesion,flexibility and impact strength is3 H,0 grade,1 mm and 50 kg·cm,respectively. Its resistances to salt,acid and alkali all reach 48 h.