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Aromatic polyoxadiazole film and preparation method thereof

A polyoxadiazole and aromatic technology, applied in the field of aromatic polyoxadiazole film and its preparation, can solve the problems of high raw material cost, poor mechanical properties, and many structural defects of materials, and achieve the effect of good price advantage

Pending Publication Date: 2020-03-20
HUAIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method not only has complicated technical routes and high cost of raw materials, but also has many structural defects and poor mechanical properties.
At this stage, the two-step method is mainly limited to laboratory research and is used to prepare optoelectronic materials, etc., but there is no report on the use of POD to prepare high-temperature resistant and functional films.

Method used

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  • Aromatic polyoxadiazole film and preparation method thereof

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preparation example Construction

[0022] A method for preparing an aromatic polyoxadiazole film according to an embodiment of the present invention includes the following steps S1-S4:

[0023] S1. Using aromatic dicarboxylic acid compound and hydrazine salt as monomers, carry out polycondensation reaction in oleum to obtain aromatic polyoxadiazole solution.

[0024] S2. The aromatic polyoxadiazole solution is extruded through a hanger-type casting die, and then transported to a dilute sulfuric acid coagulation bath for coagulation and molding to obtain a coagulated acid-containing wet primary cast film. The extrusion process of the hanger casting die is as follows: the aromatic polyoxadiazole solution is degassed by high-efficiency vacuum, then sent to the coarse filter for coarse filtration, then sent to the fine filter for fine filtration, and then sent to the hanger mold , Extruded in the die slit to the solidified roller to form a sheet polyoxadiazole solution.

[0025] S3. After washing the acid-containi...

Embodiment 1

[0045] Fuming sulfuric acid, terephthalic acid and hydrazine sulfate are mixed according to the molar ratio of 4:1:1 to carry out polycondensation reaction. The reaction temperature of the first stage is 100°C, and the reaction time is 4h; the reaction temperature of the second stage is 120°C-140°C, and the reaction time is 3h, and a chain terminator is added when the second stage is completed; the third stage of the reaction The temperature is 150° C., and the reaction time is 2 hours to obtain an aromatic polyoxadiazole solution.

[0046] The aromatic polyoxadiazole solution is degassed in a high-efficiency vacuum, and is transported by a screw pump to a coarse filter for coarse filtration, and then transported by a screw pump to a second fine filter for fine filtration, and then accurately filtered by a gear metering pump. After metering, it is sent to a coat hanger mold, and is extruded from the slit of the mold to a solidified idler roller to form a sheet-like polyoxadiaz...

Embodiment 2

[0054] This embodiment is basically the same as Embodiment 1, except that the concentration of the dilute sulfuric acid is 20%, and the temperature of the dilute sulfuric acid is 30°C.

[0055] The tensile strength of the obtained aromatic polyoxadiazole film is 110 MPa, the elongation at break is 58%, the initial decomposition temperature is greater than 480° C., and the electric breakdown strength is 120 kV.

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Abstract

The invention relates to an aromatic polyoxadiazole film and a preparation method thereof. The preparation method comprises the following steps: taking an aromatic dicarboxylic acid compound and a hydrazine salt as monomers, and carrying out condensation polymerization in fuming sulfuric acid to obtain an aromatic polyoxadiazole solution; extruding the aromatic polyoxadiazole solution through a clothes rack type casting mold, and then conveying the extruded aromatic polyoxadiazole solution into a dilute sulfuric acid coagulating bath for solidification molding to obtain a solidified acid-containing wet-state primary casting film; washing the acid-containing wet-state primary casting film to obtain a primary casting film free of sulfuric acid; and tensioning and drying the primary casting film free of sulfuric acid, carrying out heat setting treatment at 200-350 DEG C, and carrying out trimming and winding to obtain the aromatic polyoxadiazole film. The aromatic polyoxadiazole film canbe widely used as a high-temperature-resistant electric insulation film, a high-temperature-resistant insulation paper / film composite material, a copper-clad film, a high-temperature-resistant permeable film, a carbon film substrate, an aerospace material and the like.

Description

technical field [0001] The invention relates to the technical field of film preparation, in particular to an aromatic polyoxadiazole film and a preparation method thereof. Background technique [0002] Aromatic polyoxadiazole (referred to as POD) is an aromatic heterocyclic polymer material with good electrical insulation, heat resistance, oxidation resistance, etc. It is insoluble in general organic solvents and most inorganic solvents. Decomposition does not melt, so it has broad application prospects in high temperature resistance, electrical insulation and other fields. However, due to its harsh synthesis conditions, poor fluidity, and poor formability, there are relatively few research and development achievements in the synthesis of POD polymers, film, fiber and other materials, especially in film forming. [0003] In the 1960s, American scientists first initiated the research on the preparation, structure and performance of aromatic polyoxadiazoles. Since then, POD p...

Claims

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Application Information

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IPC IPC(8): C08G73/08C08J5/18C08L79/06
CPCC08G73/08C08J5/18C08J2379/06
Inventor 张再兴林红卫乔志勇李文涛舒友胡扬剑
Owner HUAIHUA UNIV
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