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A thin-walled polyimide special-shaped tube and its preparation method
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A polyimide special-shaped and polyimide circular tube technology, which is applied in the field of thin-walled polyimide special-shaped tubes and its preparation, can solve the problems of no shape memory performance, large wall thickness of metal special-shaped tubes, etc., and achieve convenient molding , Excellent processing performance, low energy consumption
Inactive Publication Date: 2020-05-12
HARBIN INST OF TECH
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[0007] The purpose of the present invention is to solve the problem that the wall thickness of the existing metal special-shaped pipe is greater than 0.6mm, and does not have shape memory performance, and to provide a thin-walled polyimide special-shaped pipe and its preparation method
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specific Embodiment approach 1
[0055] Specific embodiment 1: In this embodiment, a thin-walled polyimide special-shaped tube is prepared from a shape-memory polyimide film; the shape-memory polyimide film is prepared from diamine and dianhydride; The diamine mentioned is one of 4,4'-diaminodiphenyl ether, 1,3-bis(3-aminophenoxy)benzene and 4,4'-bis(4-aminophenoxy)biphenyl or a mixture of several of them; the dianhydride is 4,4'-hexafluoroisopropyl phthalic anhydride, bisphenol A diether dianhydride, 3,3',4,4'-di One or a mixture of benzophenone tetracarboxylic dianhydride and 4,4'-biphenyl ether dianhydride.
specific Embodiment approach 2
[0056] Specific embodiment two: this embodiment is a preparation method of a thin-walled polyimide special-shaped tube is completed according to the following steps:
[0057] 1. Add the diamine into the aprotic polar solvent, and then stir until it is completely dissolved to obtain a diamine solution;
[0058] The volume ratio of the amount of diamine described in step 1 to the aprotic polar solvent is 0.05mol:(100mL~150mL);
[0059] 2. Dissolving the dianhydride in an aprotic polar solvent to obtain a dianhydride solution;
[0060] The volume ratio of the amount of dianhydride described in step 2 to the aprotic polar solvent is 0.05mol:(80mL~150mL);
[0061] 3. Add the dianhydride solution to the diamine solution, and then polymerize for 5h to 30h at room temperature and at a stirring speed of 300r / min to 800r / min to obtain a polyamic acid solution;
[0062] The dianhydride solution described in step 3 is added to the diamine solution in 3 to 10 times;
[0063] The volume ...
specific Embodiment approach 3
[0091] Specific embodiment three: the difference between this embodiment and specific embodiment two is: the aprotic polar solvent described in step one is N,N-dimethylformamide, N,N-dimethylacetamide or N-methylpyrrolidone. Other steps are the same as in the second embodiment.
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Abstract
The invention discloses a thin-wall polyimide special pipe, and a preparation method thereof. The preparation method is used for solving problems in the prior art that the wall thickness of conventional metal special pipes is larger than 0.6mm, and shape memory properties are not achieved. The preparation method comprises following steps: 1, a diamine solution is prepared; 2, a dianhydride solution is prepared; 3, polyamide acid is prepared; 4, polyimide with shape memory properties is prepared; 5, a polyimide solution with shape memory properties is prepared; 6, a thin-wall polyimide circular pipe with shape memory properties is prepared; 7, loading of external force is carried out at a high temperature so as to prepare the thin-wall polyimide special pipe; and 8, cooling is carried out so as to obtain the thin-wall polyimide special pipe. The preparation method is suitable to be used for preparing the thin-wall polyimide special pipe.
Description
technical field [0001] The invention relates to a thin-walled polyimide special-shaped pipe and a preparation method thereof. Background technique [0002] Special-shaped pipes refer to pipes that are not circular in cross section, or pipes that have a circular cross section but have different radial wall thicknesses or varying diameters in the length direction (Journal Document 1). Compared with round pipes, special-shaped pipes generally have larger moment of inertia and section modulus, have greater bending and torsional resistance, and can greatly reduce structural weight. Metal special-shaped tubes have been widely used in aviation, aerospace, automobiles, ships, medical treatment, electronics, machinery, mining, construction and boiler manufacturing and other fields. The wall thickness of the metal special-shaped pipe is usually a few millimeters or centimeters. The thinner wall makes the special-shaped pipe have more irreplaceable advantages of other pipes, and it is...
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