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A kind of polyimide resin and its preparation method and a kind of polyimide foam

A technology of polyimide resin and polyimide, which is applied in the field of polyimide materials, can solve the problems of poor mechanical properties and low operating temperature, and achieve long service life, good thermal stability, high imide The effect of conversion rate

Active Publication Date: 2016-09-07
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention solves the technical problems of low service temperature and poor mechanical properties of the polyimide foam prepared from methacrylic acid and methacrylonitrile monomers in the prior art, and proposes a novel polyimide resin and its Preparation method and a kind of polyimide foam

Method used

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  • A kind of polyimide resin and its preparation method and a kind of polyimide foam
  • A kind of polyimide resin and its preparation method and a kind of polyimide foam
  • A kind of polyimide resin and its preparation method and a kind of polyimide foam

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preparation example Construction

[0027] The present invention also provides a preparation method of the polyimide resin, comprising adding aromatic amine, polylactide, and dianhydride into a solvent, and removing the solvent after reaction to obtain the polyimide resin;

[0028] Wherein, the aromatic amine is or

[0029] The dianhydride is (Pyromellitic dianhydride), or

[0030] In the present invention, the aromatic amine preferably adopts Its chemical name is 3,5-diaminobenzoic acid, but it is not limited thereto.

[0031] Polylactide, also known as polylactic acid, has a structural formula of

[0032] According to the preparation method of the present invention, during the reaction, the amino group in the aromatic amine reacts with the acid anhydride group in the dianhydride to form an imide structural unit, and the carboxyl or hydroxyl group that does not participate in the reaction on the aromatic amine continues to react with the polypropylene The lactide undergoes a condensation reactio...

Embodiment 1

[0047] (1) Accurately weigh 233mL of DMF and 167mL of tetrahydrofuran as a mixed solvent and place them in a three-necked flask, add 11.23g of aromatic amine (3,5-diaminobenzoic acid), stir until completely dissolved, then add 30.91g of Dianhydride (3,3',4,4'-benzophenone tetraacid dianhydride) was added slowly and quantitatively in batches, and reacted at room temperature for 3h. Then add 227.1g of polylactide (molecular weight 2538, that is, n=35), that is, the molar ratio of aromatic amine, polylactide and dianhydride is 1:0.87:0.96, and then continue stirring at 80°C for 4h, then Distill under reduced pressure, remove solvent, continue vacuum drying, obtain the pale yellow polyimide resin solid of the present embodiment, denoted as S1, it contains the structural unit shown in formula III, wherein R 1 for n=35, R 2 for

[0048] (2) Crush S1 and press it into thin slices at room temperature, preheat at 120°C for 30 minutes, then heat at 180°C for 5 minutes, raise the te...

Embodiment 2

[0050] The polyimide resin S2 and the polyimide foam S20 of the present embodiment were prepared in the same manner as in Example 1, the difference being:

[0051] In step (1), using As the dianhydride of this embodiment instead of 3,3',4,4'-benzophenone tetraacid dianhydride in Example 1, and aromatic amine, polylactide (molecular weight is 2538, ie n=35) The molar ratio with dianhydride is 1:0.87:1;

[0052] The polyimide resin S2 that obtains by above-mentioned steps, obtains it and contains the structural unit shown in formula II, wherein R 1 for n=35.

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Abstract

The present invention provides a polyimide resin, which contains a structural unit represented by formula I, formula II or formula III. The invention also provides a preparation method of the polyimide resin, which comprises adding aromatic amine, polylactide and dianhydride into a solvent, and removing the solvent after reaction to obtain the polyimide resin. Finally, the present invention also provides a polyimide foam, which is obtained by crushing the polyimide resin provided by the present invention, pressing it into sheets, and then heating and foaming. In the polyimide resin provided by the present invention, the imide structural unit contained has good reactivity, and after heating and foaming, polyimide resin with good thermal stability, chemical stability and mechanical properties and long service life can be obtained. imine foam.

Description

technical field [0001] The invention belongs to the field of polyimide materials, and in particular relates to a polyimide resin, a preparation method thereof and a polyimide foam. Background technique [0002] With the emergence of polymer synthetic materials, porous materials have been widely used in the synthetic plastics industry, and various types of foamed plastics can be seen everywhere. Compared with polyurethane, polyethylene, polystyrene and other transmission foam materials, polyimide foam has excellent heat resistance, high temperature barrier properties, noise reduction, impact resistance, dimensional stability, wave permeability and Flame retardant properties can be used as heat insulation, sound insulation and flame retardant properties, and can be used in aircraft, spacecraft, weaponry, ships, high-speed trains and automobiles. [0003] At present, the polyimide foam used in the prior art is generally prepared by adding fatty alcohol as a foaming agent to a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G73/16C08J9/00C08L79/08
Inventor 赵婷婷宋宇吴波金启明
Owner BYD CO LTD
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