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A preparation method of hybrid functionalized carbon nanotubes and nanoparticles synergistically modified epoxy resin adhesive

A carbon nanotube and epoxy resin technology, applied in the direction of epoxy resin glue, adhesive, adhesive type, etc., can solve the problems of uneven distribution of non-covalent functional groups, carbon nanotube slippage, interface debonding, etc.

Active Publication Date: 2020-10-23
GUANGDONG UNIV OF PETROCHEMICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the actual synthesized carbon nanotube composites inevitably have problems such as local stress concentration at the interface or uneven distribution of non-covalent functional groups, which will cause interface debonding and form defects, such as figure 1 As shown in (b), it expands under loading, eventually causing the functional groups to peel off the surface of the carbon nanotubes, and the carbon nanotubes slip

Method used

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  • A preparation method of hybrid functionalized carbon nanotubes and nanoparticles synergistically modified epoxy resin adhesive
  • A preparation method of hybrid functionalized carbon nanotubes and nanoparticles synergistically modified epoxy resin adhesive

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preparation example Construction

[0036] Preparation of modified epoxy resin adhesive: Disperse a certain amount of hybrid functionalized carbon nanotubes and functionalized nano-silica in toluene solution, ultrasonically oscillate for 2 hours, then add a certain amount of epoxy resin, and continue ultrasonically oscillating for 2 hours. Afterwards, the above mixed solution was placed in a vacuum drying oven, and vacuumized for 1-3 hours to evaporate the toluene solvent. Raise the temperature to 50°C, add a certain amount of curing agent, stir evenly, and then use it for casting tensile test specimens or bonding tensile shear test specimens.

[0037] The tensile performance test of the adhesive material is carried out in accordance with the specification GB / T 1014-1992: the sample size is Type I, the adhesive is evenly stirred and cast into a mold, and then solidified step by step by vacuuming in a vacuum drying oven to remove air bubbles. The prepared specimens were cooled naturally to room temperature and de...

Embodiment 1

[0040] Preparation of hybrid functionalized carbon nanotubes and nano-silica modified epoxy resin adhesives, the number of carboxyl and hydroxyl groups introduced on the surface of carbon nanotubes does not exceed 1% of the number of atoms on the surface of carbon nanotubes, and the modified epoxy resin adhesive contains 0.01wt % MWCNTs-Epon828-PPA and 0.01wt% and nano-silica. Two kinds of samples were prepared, and tensile test and tensile shear test were carried out respectively. The measured tensile strength was 95.7MPa, elastic modulus was 0.86GPa, and tensile shear strength was 28.8MPa.

Embodiment 2

[0042] Preparation of hybrid functionalized carbon nanotubes and nano-silica modified epoxy resin adhesives, the number of carboxyl and hydroxyl groups introduced on the surface of carbon nanotubes does not exceed 1% of the number of atoms on the surface of carbon nanotubes, and the modified epoxy resin adhesive contains 0.05wt % MWCNTs-Epon828-PPA and 0.05wt% nano-silica. Two kinds of samples were prepared, and tensile test and tensile shear test were carried out respectively, and the measured tensile strength was 103.4MPa, elastic modulus was 0.92GPa, and tensile shear strength was 29.6MPa.

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Abstract

The invention discloses a preparation method of an epoxy resin adhesive synergistically modified by hybrid functionalized carbon nanotubes and nanoparticles. The method comprises the following steps: S1, introducing carboxyl groups and hydroxyl groups onto the surfaces of carbon nanotubes, wherein the numbers of the introduced carboxyl groups and hydroxyl groups are less than or equal to 1% of the number of atoms on the surfaces of the carbon nanotubes, and further covalently linking other functional groups to obtain functionalized carbon nanotubes; S2, coating the surfaces of the functionalized carbon nanotubes with conjugated polymers by means of non-covalent interaction to obtain the hybrid functionalized carbon nanotubes; S3, fully mixing the hybrid functionalized carbon nanotubes with the nanoparticles, epoxy resin and a curing agent to prepare the epoxy resin adhesive through a solution blending method. Compared with a common epoxy resin adhesive, the modified epoxy resin adhesive prepared by the method has remarkably improved tensile strength, elastic modulus and tensile shear strength, and the thermal stability of the modified epoxy resin adhesive is also improved to a certain extent.

Description

technical field [0001] The invention belongs to the technology of modified epoxy adhesives, and in particular relates to a method for preparing hybrid functionalized carbon nanotubes and nanoparticles synergistically modified epoxy resin adhesives. Background technique [0002] Adhesives can realize the connection between the same or different materials. It has the advantages of no stress concentration at the joint, high bonding strength, and easy automation of the bonding process. The application scope involves building materials, automobiles and transportation, electronic appliances , machinery manufacturing, aerospace and many other fields. Adhesives can be divided into ordinary adhesives and structural adhesives according to different application fields. Among them, structural adhesives are used for the bonding of stressed structural parts, which can withstand large loads and can be used for a long time. They mainly include epoxy resin glue, polyurethane glue, Acrylic g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J163/00C09J11/04
CPCC08K3/36C08K7/24C08K9/02C08K9/06C08K9/08C08K9/10C08K2201/011C09J11/04C09J163/00
Inventor 肖潭熊慧芳肖能
Owner GUANGDONG UNIV OF PETROCHEMICAL TECH
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