Carbon nanotube-modified epoxy resin adhesive for sticky carbon fiber reinforcement

A carbon nanotube modification, epoxy resin glue technology, applied in epoxy resin glue, non-polymer adhesive additives, adhesives and other directions, can solve problems such as affecting the reinforcement effect of carbon fiber Enhance, improve the effect of the effect

Inactive Publication Date: 2014-10-08
BEIJING CHINA COAL MINE ENG CO LTD
2 Cites 14 Cited by

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Problems solved by technology

If the quality of the adhesive used for carbon fiber reinforcement is not ...
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Abstract

The invention relates to a carbon nanotube-modified epoxy resin adhesive for sticky carbon fiber reinforcement. The adhesive comprises an epoxy resin matrix and carbon nanotubes, wherein the mass of the carbon nanotubes is 0.1%-15% of the total mass of the epoxy resin matrix; amine groups capable of reacting with the epoxy resin can be grafted on the carbon nanotubes by carrying out surface treatment on the carbon nanotubes to obtain a good modification effect; when ingredient blending is performed during reinforcement construction, 20-50 parts of an epoxy curing agent is added into 100 parts of carbon nanotube-modified epoxy resin. The cured epoxy resin adhesive modified by the method disclosed by the invention has the advantages of relatively high tensile strength, compressive strength, bending strength and shearing tensile strength, relatively high mechanical properties and good carbon fiber wetting properties, is more suitable for the sticky carbon fiber reinforcement process and can play a better reinforcement effect.

Application Domain

Non-macromolecular adhesive additivesEpoxy resin adhesives

Technology Topic

Carbon nanotubeSurface finishing +10

Examples

  • Experimental program(10)

Example Embodiment

[0019] Example 1
[0020] 1g of multi-walled carbon nanotubes was added to 100g of epoxy resin matrix, and treated with an ultrasonic disperser for 5 hours to fully disperse the multi-walled carbon nanotubes in the epoxy resin matrix to obtain an adhesive.
[0021] During construction, 30g of epoxy resin curing agent is added to 100g of adhesive, and it can be used for bonding carbon fiber reinforcement after mixing evenly.
[0022] Part of the mechanical properties of the adhesive after curing are as follows:
[0023] The tensile strength is 48MPa; the compressive strength is 80MPa; the bending strength is 52MPa; the tensile shear strength is 15MPa.

Example Embodiment

[0024] Example 2
[0025] Add 1g of single-walled carbon nanotubes to 100mL of a mixed acid composed of sulfuric acid and nitric acid (the volume ratio of sulfuric acid to nitric acid is 3:1, the mass fraction of sulfuric acid is 65%, and the mass fraction of nitric acid is 60%). Ultrasonic treatment at 70°C for 5 hours with an ultrasonic power of 50W to remove impurities in the single-walled carbon nanotubes and oxidize the carboxyl groups, and then use deionized water to repeatedly wash and filter the carboxylated single-walled carbon nanotubes Until the filtrate is neutral, dry for use.
[0026] Put 0.5g carboxylated single-walled carbon nanotubes in a 100mL flask, add 50mL thionyl chloride (SOCl 2 ), after magnetic stirring and refluxing at 70°C for 24 hours, the excess SOCl was removed by distillation under reduced pressure 2 , Pour the product into 100 mL chloroform, sonicate for 10 min, filter under reduced pressure, and rinse with 200 mL chloroform. After drying the product under vacuum at 70°C for 24 hours, pour it into a 100 mL flask and add 50 mL N,N-dimethyl Formamide (DMF) and 5.0g 1,6-hexamethylenediamine were reacted for 24 hours under the ultrasonic power of 80W, the reaction temperature was 100℃. After the reaction, the product was filtered under reduced pressure and the product was washed with absolute ethanol until the washing liquid After clarification, it was filtered with a porous membrane and dried in vacuum. After drying in vacuum at 80°C for 24 hours, the modified single-walled carbon nanotubes were obtained.
[0027] 0.5g of modified single-walled carbon nanotubes was added to 100g of epoxy resin matrix, treated with an ultrasonic disperser for 4h, so that the single-walled carbon nanotubes were fully dispersed in the epoxy resin matrix to obtain an adhesive.
[0028] During construction, add 33g of curing agent for epoxy resin to 100g of the above-mentioned adhesive, and mix it evenly, then it can be used for bonding carbon fiber reinforcement.
[0029] Part of the mechanical properties of the adhesive after curing are as follows:
[0030] The tensile strength is 57MPa; the compressive strength is 104MPa; the bending strength is 62MPa; the tensile shear strength is 17MPa.

Example Embodiment

[0031] Example 3
[0032] Add 2g of single-walled carbon nanotubes to 100mL of a mixed acid composed of sulfuric acid and nitric acid (the volume ratio of sulfuric acid to nitric acid is 3:1, the mass fraction of sulfuric acid is 70%, and the mass fraction of nitric acid is 50%). Ultrasonic treatment at 70°C for 5 hours with an ultrasonic power of 50W to remove impurities in the single-walled carbon nanotubes and oxidize the carboxyl groups, and then use deionized water to repeatedly wash and filter the carboxylated single-walled carbon nanotubes Until the filtrate is neutral, dry for use.
[0033] Place 1g of carboxylated single-walled carbon nanotubes in a 500mL flask, add 200mL of thionyl chloride (SOCl 2 ) And 8mL DMF, magnetically stirred at 70°C and refluxed for 24 hours, then distilled under reduced pressure to remove excess SOCl 2 , Pour the product into 200 mL chloroform, sonicate for 10 min, filter under reduced pressure, and rinse with 300 mL chloroform. After drying the product under vacuum at 70°C for 24 hours, pour it into a 500 mL flask, add 240 mL triethylenetetramine, and shake The reaction was carried out under ultrasonic conditions with a power of 80W for 24 hours, and the reaction temperature was 120°C. After the reaction, it was filtered under reduced pressure, and the product was washed with absolute ethanol until the washing liquid was clear, and then filtered with a porous membrane and dried in vacuum at 60°C. After 24 hours of drying, modified single-walled carbon nanotubes were obtained.
[0034] 0.8 g of modified single-walled carbon nanotubes were added to 100 g of epoxy resin matrix, and treated with an ultrasonic disperser for 3 hours to fully disperse the modified single-walled carbon nanotubes in the epoxy resin matrix to obtain an adhesive.
[0035] During construction, 35g of epoxy resin curing agent is added to 100g of the above-mentioned adhesive, and the mixture can be used for bonding carbon fiber reinforcement.
[0036] Part of the mechanical properties of the adhesive after curing are as follows:
[0037] The tensile strength is 64MPa; the compressive strength is 112MPa; the bending strength is 72MPa; the tensile shear strength is 20MPa.

PUM

PropertyMeasurementUnit
Tensile strength48.0mPa
Compressive strength80.0mPa
Bending strength52.0mPa

Description & Claims & Application Information

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