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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
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the quality of the adhesive used for carbon fiber reinforcement is not good, it will affect the reinforcement effect of carbon fiber reinforcement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1 g of multi-walled carbon nanotubes was added to 100 g 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, add 30g of curing agent for epoxy resin to 100g of adhesive, mix well and then use it for carbon fiber reinforcement.

[0022] Some mechanical properties of the adhesive after curing are as follows:

[0023] Tensile strength 48MPa; compressive strength 80MPa; bending strength 52MPa; tensile shear strength 15MPa.

Embodiment 2

[0025] 1g of single-walled carbon nanotubes were added to 100mL of mixed acid consisting of sulfuric acid and nitric acid (wherein the volume ratio of sulfuric acid to nitric acid was 3:1, the mass fraction of sulfuric acid was 65%, and the mass fraction of nitric acid was 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 repeatedly wash and filter the carboxylated single-walled carbon nanotubes with deionized water Until the filtrate is neutral, dry it for later use.

[0026] 0.5 g of carboxylated single-walled carbon nanotubes were placed in a 100 mL flask, and 50 mL of thionyl chloride (SOCl 2 ), magnetically stirred at 70°C and refluxed for 24 hours, and the excess SOCl was distilled off under reduced pressure 2 , the product was poured into 100mL chloroform, ultrasonicated for 10min, filtered under reduced pressure, and rinsed with 200mL chl...

Embodiment 3

[0032] 2g of single-walled carbon nanotubes were added to 100mL of mixed acid consisting of sulfuric acid and nitric acid (wherein the volume ratio of sulfuric acid to nitric acid was 3:1, the mass fraction of sulfuric acid was 70%, and the mass fraction of nitric acid was 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 repeatedly wash and filter the carboxylated single-walled carbon nanotubes with deionized water Until the filtrate is neutral, dry it for later use.

[0033] 1 g of carboxylated single-walled carbon nanotubes was placed in a 500 mL flask, and 200 mL of thionyl chloride (SOCl 2 ) and 8 mL of DMF, magnetically stirred at 70°C and refluxed for 24 hours, then distilled off excess SOCl under reduced pressure 2 , the product was poured into 200mL chloroform, ultrasonicated for 10min, filtered under reduced pressure, and rinsed with 30...

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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.

Description

technical field [0001] The invention relates to an epoxy resin adhesive, in particular to a carbon nanotube modified epoxy resin adhesive used for bonding carbon fiber for reinforcement. Background technique [0002] Carbon fiber reinforcement and repair of concrete structures is a new type of reinforcement and reinforcement technology that emerged in developed countries such as Japan and the United States in the late 1980s and early 1990s. It has been widely used in the reinforcement and repair of concrete structures in bridges and buildings (structures). project. Compared with the traditional reinforcement technology, carbon fiber reinforcement has the advantages of high strength and high efficiency, excellent corrosion resistance, durability and good fatigue resistance, does not increase the weight and volume of components, and has a wide range of applications. [0003] Since carbon fiber itself has very good mechanical properties, the adhesive often becomes a key factor...

Claims

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Application Information

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IPC IPC(8): C09J163/00C09J11/04
Inventor 滕德强杨春满王群程子厚罗毅田乐王媛马灵姬
Owner BEIJING CHINA COAL MINE ENG CO LTD
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