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Self-emulsifying non-ionic water-based polyamideimide and preparation method thereof, carbon fiber sizing agent and preparation method and application thereof

A polyamide-imide, non-ionic technology, applied in the direction of carbon fiber, fiber treatment, fiber type, etc., can solve the problems of difficult industrialization and unsuitable carbon fiber production line, etc., to reduce hygroscopicity, improve anti-humid heat aging performance, and improve dissolution. sexual effect

Active Publication Date: 2022-05-31
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method requires imidization at a high temperature above 300°C in the later stage, which is not suitable for the existing carbon fiber production line and is difficult to industrialize

Method used

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  • Self-emulsifying non-ionic water-based polyamideimide and preparation method thereof, carbon fiber sizing agent and preparation method and application thereof
  • Self-emulsifying non-ionic water-based polyamideimide and preparation method thereof, carbon fiber sizing agent and preparation method and application thereof
  • Self-emulsifying non-ionic water-based polyamideimide and preparation method thereof, carbon fiber sizing agent and preparation method and application thereof

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specific Embodiment approach 1

[0046] The present invention provides a self-emulsifying nonionic water-based polyamideimide, the structural formula of which is shown in formula I.

[0047]

[0048] In Formula 1, R is H or a methyl group, and X is a natural number between 1 and 9.

specific Embodiment approach 2

[0049] The present invention provides the preparation method of the self-emulsifying non-ionic water-based polyamideimide described in the specific embodiment, comprising the following steps:

[0050] Step 1, L-cysteine ​​reacts with an acrylate compound containing multiple ethoxy groups in water under alkali catalysis conditions to obtain a cysteine ​​derivative, as shown in formula II, named L-Cys-OA ;

[0051]

[0052] In formula 2, R is H or methyl, and x is a natural number from 1 to 9;

[0053] Step 2. The cysteine ​​derivative shown in formula II is reacted with 1,2,4-cyclohexanetricarboxylic acid anhydride in glacial acetic acid to obtain a water-soluble imide acid-containing monomer, as shown in formula III, named for DA-OA.

[0054]

[0055] In formula III, R is H or methyl, and x is a natural number from 1 to 9;

[0056] Step 3. The water-soluble imide acid-containing monomer represented by formula III and 2,2-bis[4-(4-aminophenoxy)phenyl]propane are in the...

specific Embodiment approach 3

[0060] A preparation method of carbon fiber sizing agent, comprising the following steps:

[0061] The polymer PAI-OA synthesized by the specific embodiment 2 is dissolved in a small amount of organic solvent to obtain a polymer solution of a certain concentration, and this solution is directly added dropwise to a large amount of water under stirring to prepare an aqueous dispersion of a certain concentration. That is, carbon fiber sizing agent.

[0062] Further, the organic solvent is one of N,N-dimethylformamide, N,N-dimethylacetamide, N-methylpyrrolidone, and dimethyl sulfoxide; the polymer solution concentration is 10 ∼15% (w / v), specifically 15% (w / v), and the concentration of the carbon fiber sizing agent is 0.1-1 wt%, specifically 0.5 wt%.

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Abstract

The invention discloses self-emulsifying non-ionic water-based polyamideimide and a preparation method thereof, a carbon fiber sizing agent and a preparation method and application thereof, and belongs to the field of polymers and composite materials. The polyamideimide provided by the invention can form a uniform and stable aqueous dispersion in the presence of water and a small amount of organic solvent through self-emulsification, a surfactant does not need to be used, and the mechanical property of a composite material is remarkably improved. The hydrophilic group polyethyoxyl side group can be removed in a fiber sizing process, so that the damp-heat aging resistance of the fiber and the composite material of the fiber can be improved. The polyamide-imide sizing agent provided by the invention solves the problem that the heat resistance and compatibility of the traditional carbon fiber epoxy sizing agent and the high-performance thermoplastic resin composite material are not matched, and is suitable for various carbon fiber reinforced high-performance thermoplastic composite materials.

Description

technical field [0001] The invention relates to the field of polymers and composite materials, in particular to a self-emulsifying nonionic water-based polyamideimide and a preparation method thereof, a carbon fiber sizing agent, a preparation method and application thereof. Background technique [0002] Carbon fiber reinforced composite materials are widely used in the fields of automobile, aviation and aerospace due to their light weight and high strength. Among them, high-performance thermoplastic composite materials have the advantages of high impact strength, simple and diverse molding methods, short molding cycle, and recyclability compared with thermosetting composite materials, and their applications in various fields are increasing year by year. However, the traditional epoxy carbon fiber sizing agent cannot satisfy the high-performance thermoplastic resin matrix in terms of heat resistance and compatibility, and it is urgent to develop a carbon fiber sizing agent s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/14D06M15/59C08J5/06C08L79/08C08L61/16C08K9/04C08K7/06D06M101/40
CPCC08G73/14D06M15/59C08J5/06C08J2379/08C08J2361/16C08K9/08C08K7/06D06M2101/40D06M2200/40Y02W30/62
Inventor 刘丽马震宇普饮川黄玉东
Owner HARBIN INST OF TECH
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