Polyimide Coating Material Preparation

In this paper," the polyimide surface coating material preparation" project research process were systematically discussed,the project by the China Aerospace Science and Technology Corporation Fifth Research Institute 510th proposed for lunar exploration,lunar lander spacecraft and the outer surface of the flag.This is my first time in space mission aircraft surface mounted flag.The completion of the project from the certain significance revealed in recent years our country in spaceflight career progress,highlight the national symbol,is therefore of great significance.Polyimide film having high and low temperature resistance,aging resistance,high energy particles and many other excellent properties,commonly used in spacecraft assembly,technology and application conditions are ripe.The polyimide coating on the surface of the flag,and the need to consider the matching,coating tolerance of high and low temperature resistance,high energy particle,anti-aging and other issues,because of domestic and international published very few articles concerning this aspect,only the literature to thermal control coatings as the research object,and the project requirement.Based on the requirements of space flight,we focused on the outgassing rate and coating properties were compared,identified primer using polyester amino heat curing coating system,the middle layer using a silicone modified polyester amide hot curing coating,surface layer with high silicon content in polyester amino heat curable coating;selection of pigments and fillers on high weather resistance,high covering power breed,and the introduction of appropriate amount of nano zinc oxide coating,fumed silica as reinforcing agent and a matting agent;in order to achieve the good adhesion between coatings,we adopt fillers are a silane coupling agent,activation,and strive to achieve the best results.Coatings obtained by multiple screen printing produced meet the requirements of the standard" flag",by the joint test performance fully meet our country" star material" requirements,the joint inspection,now has to offer " is like" stage,is expected to soon be installed using.