Quality loss when exporting on Adobe Premiere
Use a visually lossless (intermediary) codec when going between different editing applications. Avid DNxHR, Apple Prores, Edius HQX, and GoPro Cineform are all examples of intermediary codecs. I personally prefer DNxHR, but all the options I listed are good options.

You can also use dynamic link between After Effects and Premiere, which would be even better.