▎ 摘　　要

NOVELTY - Polyimide self-lubricating ink comprises 20-70 pts. wt. polyamic acid, 30-60 pts. wt. organic solvent, 1-10 pts. wt. thickener and 1-20 pts. wt. self-lubricating agent. The number average molecular weight of the polyamic acid is 5000-500,000. The viscosity of the polyimide self-lubricating ink is 102-105 Pa/s. USE - The polyimide self-lubricating ink is useful as 3D printing ink in self-lubricating molded device for direct writing 3D printing (claimed). ADVANTAGE - The ink: has low friction coefficient and wear rate, excellent thermal stability, high precision, excellent dimensional stability, corrosion resistance and high mechanical strength; and can realizes the designability, customizability and complexity of self-lubricating molded devices. The method: has simple process, low cost and low energy consumption. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) preparing polyimide self-lubricating ink, comprising mixing polyamic acid, organic solvent, thickener and self-lubricating agent, then carrying out ultrasonication and ball milling to obtain mixture, and then degassing the mixture to obtain polyimide self-lubricating ink; and (2) use method of polyimide self-lubricating ink as 3D printing ink in direct writing 3D printing, comprising printing polyimide self-lubricating ink after establishing a model through direct writing 3D printer to obtain blank, and then heating the blank for imidization to obtain self-lubricating molded device.