Method for adsorbing polymine on carbon fiber surface in supercritical methanol

A technology of polyethyleneimine and supercritical methanol, which is applied in the fields of carbon fiber, fiber treatment, textiles and papermaking, etc., can solve the problems of low resin bonding strength, cumbersome operation, and unsuitable implementation, and achieve improved interface properties, improved surface energy, Increases the effect of mechanical meshing

Inactive Publication Date: 2015-04-29
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems that the existing carbon fiber modification method makes its own strength seriously lost, the operation is cumbersome, it is not suitable for implementation and the problem of low bonding strength with resin, and to provide a carbon fiber surface adsorption polyethylene in supercritical methanol imine method

Method used

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  • Method for adsorbing polymine on carbon fiber surface in supercritical methanol
  • Method for adsorbing polymine on carbon fiber surface in supercritical methanol
  • Method for adsorbing polymine on carbon fiber surface in supercritical methanol

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specific Embodiment approach 1

[0045] Specific embodiment one: present embodiment is a kind of method for carbon fiber surface adsorption polyethylenimine in supercritical methanol, specifically completes according to the following steps:

[0046] 1. Cleaning:

[0047] ① Put the carbon fiber into a Soxhlet extractor filled with acetone, and use acetone to clean and remove impurities on the surface of the carbon fiber at a temperature of 75°C to 85°C. The cleaning time is 2h to 8h, and the cleaned carbon fiber is taken out. Obtain the carbon fiber after cleaning with acetone;

[0048] ②. Place the carbon fiber cleaned with acetone obtained in step ① into a supercritical device, and soak it in a supercritical acetone-water system with a temperature of 350°C to 370°C and a pressure of 8MPa to 14MPa for 20min to 30min to obtain ring removal Carbon fiber after oxygen coating;

[0049] The volume ratio of acetone and water in the supercritical acetone-water system described in step 2. is 5:1;

[0050] ③. Place...

specific Embodiment approach 2

[0074] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is: in step ①, put the carbon fiber into a Soxhlet extractor equipped with acetone, and use acetone to wash and remove it at a temperature of 80°C to 82°C Impurities on the surface of the carbon fibers are cleaned for 4 hours to 8 hours, and the cleaned carbon fibers are taken out to obtain carbon fibers cleaned with acetone. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0075] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: in step one (2), the carbon fibers obtained in step one (1) after cleaning with acetone are placed in a supercritical device, at a temperature of 360° C. to 370° C. ℃ and a pressure of 10MPa-14MPa in a supercritical acetone-water system for 20min-30min to obtain the carbon fiber after removing the epoxy coating. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a method for adsorbing polymine on a carbon fiber surface in supercritical methanol, relates to a carbon fiber surface adsorption method, and aims to solve problems that an existing carbon fiber modifying method causes severe strength loss to the carbon fiber, is complex to operate, not suitable for being performed, low in bonding strength with resin. The method comprises the following steps: I, cleaning; II, oxidizing; III, adsorbing polymine in supercritical methanol to obtain carbon fiber, surface of which is adsorbed with the polymine, thereby completing grafting hexamine on the carbon fiber surface in the supercritical methanol. According to the method, interface shearing strength of the carbon fiber, surface of which is adsorbed with the polymine, is increased to 101.8 MPa-103 MPa from unmodified 64.9 MPa, and increased by 56.9%-59.7%; impact strength is increased to 84.39 kJ/m<2>-86.7 kJ/m<2> from 55.77 kJ/m<2>. The invention discloses a method for grafting hexamine on the carbon fiber surface.

Description

technical field [0001] The invention relates to a method for carbon fiber surface adsorption. Background technique [0002] Carbon fiber reinforced polymer matrix composites are widely used in the aerospace field because of their light weight, high specific strength and high specific rigidity. As an important part of composite materials, the interface affects the transmission mode and uniform distribution of stress in composite materials, as well as the propagation process of damage and cracks inside the material, and affects the strength, toughness, environmental resistance and chemical stability of the material to a large extent. sex. Due to the smooth and inert physical and chemical characteristics of the carbon fiber surface, its interfacial bonding with the polymer matrix is ​​usually weak, and its surface must be activated before use. [0003] Commonly used carbon fiber surface modification methods mainly include chemical vapor deposition, chemical oxidation, and che...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M15/61D06M11/50D06M11/65D06M13/144D06M101/40
Inventor 孟令辉马丽春黄玉东武光顺王宇威赵敏谢非
Owner HARBIN INST OF TECH
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