摘要：【中文】本说明公开了一种改性聚酰亚胺薄膜的制备方法，其包括在室温条件下，将亚麻纤维和/或纸纤维加入离子液体中进行搅拌，直至溶体形成无色透明凝胶状，然后过滤得无色透明凝胶体；将制备的无色透明凝胶体加入树脂溶液中搅拌制得改性树脂溶液；其中加入的亚麻纤维和/或纸纤维的质量为树脂溶液中固含量的0.1wt％～4.8wt％；所述树脂溶液为聚酰胺酸树脂溶液和/或聚酰亚胺树脂溶液；将改性树脂溶液经成型、双向拉伸制得改性聚酰亚胺薄膜。同时还公开了一种改性聚酰亚胺薄膜。通过在树脂溶液中加入经离子液体部分溶解表面均相衍生化反应改性的无色透明微纳米亚麻和/或纸纤维，有效提升无色透明聚酰亚胺薄膜的力学特性、光学特性及吸湿特性。 【EN】The specification discloses a preparation method of a modified polyimide film, which comprises the steps of adding flax fibers and/or paper fibers into ionic liquid at room temperature, stirring until a solution forms a colorless transparent gel, and filtering to obtain a colorless transparent gel; adding the prepared colorless transparent gel into a resin solution and stirring to prepare a modified resin solution; wherein the mass of the added flax fiber and/or paper fiber is 0.1-4.8 wt% of the solid content in the resin solution; the resin solution is polyamic acid resin solution and/or polyimide resin solution; and molding and biaxially stretching the modified resin solution to obtain the modified polyimide film. Also discloses a modified polyimide film. The colorless and transparent micro-nano flax and/or paper fiber modified by partial dissolution of the ionic liquid and homogeneous derivatization reaction on the surface is added into the resin solution, so that the mechanical property, the optical property and the moisture absorption property of the colorless and transparent polyimide film are effectively improved.

摘要：【中文】本说明公开了一种低黄变的无色透明聚酰亚胺薄膜的制备方法，包括聚酰胺酸和/或聚酰亚胺树脂溶液的聚合反应，在聚合反应之前或之后加入第一抑黄变添加剂和抑黄催化剂，并在聚合反应之后生成的聚酰胺酸和/或聚酰亚胺树脂溶液中加入第二抑黄变添加剂。同时还公开了制备的无色透明聚酰亚胺薄膜。本发明制备的无色透明聚酰亚胺薄膜可在300℃以上高温亚胺化过程中且有氧环境下制得兼具高透明性、力学性能、介电性能等物性的同时，有效提升无色透明聚酰亚胺薄膜的热稳定性、光学特性及吸湿特性，更加满足市场的需求，扩大产品应用领域。 【EN】The description discloses a preparation method of a low-yellowing colorless transparent polyimide film, which comprises the steps of carrying out polymerization reaction on polyamic acid and/or polyimide resin solution, adding a first yellowing-inhibiting additive and a yellowing-inhibiting catalyst before or after the polymerization reaction, and adding a second yellowing-inhibiting additive into the polyamic acid and/or polyimide resin solution generated after the polymerization reaction. Also discloses the prepared colorless transparent polyimide film. The colorless transparent polyimide film prepared by the invention can be prepared in an aerobic environment in a high-temperature imidization process of more than 300 ℃, and has physical properties such as high transparency, mechanical property, dielectric property and the like, and simultaneously, the thermal stability, optical property and moisture absorption property of the colorless transparent polyimide film are effectively improved, the market demand is more met, and the product application field is expanded.