What is 4,4′-(Hexafluoroisopropylidene)diphthalic anhydride 6FDA?

6FDA refers to 4,4′-(hexafluoroisopropene) diphthalic anhydride, chemical formula C19H6F6O6. It is an important synthetic intermediate and pharmaceutical intermediate, and is one of the most promising dianhydride monomers at present, mainly as raw materials for electronic material production. The introduction of hexafluorodianhydride into the production of polyimide has made a qualitative leap in the performance of polyimide in terms of dielectric constant, dielectric loss, transparency, relative thermal stability and radiation resistance. The downstream products can be used in semiconductor, aerospace and other high-energy fields. In recent years, the industrial use is mainly used as the main raw material of colorless transparent polyimide (CPI).

Hexafluorodianhydride (6FDA) is prepared as a fluorinated polyimide core monomer:

6FDA is an important monomer in the synthesis of polyimide (PI). Hexafluorodianhydride contains hexafluoroisopropylidene structural unit, and the fluorinated polyimide prepared from it has excellent thermal stability, fire resistance, oxidation resistance, light transmittance, solubility, water absorption, etc., which is more widely used than traditional polyimides.

Polyimide is a kind of aromatic heterocyclic polymer compound, there are more than 20 varieties, among which the demand of 6FDA polyimide is increasing. Fluorinated polyimide (FPI) is formed from fluorinated dianhydride and fluorinated diamine by molten polycondensation or solution polycondensation. Hexafluoronic anhydride is one of the most widely used and most used dianhydride monomers in fluorinated polyimides at present. It is widely used in binders, coatings, flexible display materials, solar cell substrates, carbon molecular sieve membranes, optical communication components and other fields. In recent years, thanks to the development of the polyimide market, the market demand for hexafluorodianhydride has been rapidly released.

What are the advantages of 6FDA products?

1.Low dielectric constant. The permittivity of ordinary polyimide is about 3.4, but after adding 6FDA, the permittivity can be reduced to 2.5. The low dielectric constant brings about the reduction of signal delay and loss, which is of great value in electrical applications.
2.Transparency and controllable refractive index. Because polyimide is slightly yellow or brown, after adding 6FDA, it can be made transparent, and according to how much 6FDA is added, its refraction index (refractiveindex) can be controlled, and these properties have a great role in optical component applications.
3.Chemical and thermal stability. After the introduction of fluorine atoms, the chemical and thermal stability of polyimide will be improved due to the strong electronegativity of fluorine atoms. The product can work under special chemical or temperature conditions.
4.Lubricity. Due to the low polarity of fluorine atoms, fluorinated polyimides have a very low surface free energy, smooth surface and low friction.
5.The fluorinated polyimide material synthesized with 6FDA has very good thermal oxidation resistance, high temperature hot melt and radiation resistance, and is the preferred structural material for the aerospace industry.