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Method for grafting SiO2 nanoparticles with graphene oxide modified epoxy resin

A nanoparticle and epoxy resin technology, applied in the field of material chemistry, can solve problems such as pollution, high cost, and complicated operation process, and achieve the effects of simple equipment, easy operation, and simple preparation process

Active Publication Date: 2012-07-25
福州乐道知识产权运营有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although there are many methods for modifying epoxy resin at present, most of them have complicated operation process, pollution phenomenon, high cost, and use SiO 2 The concept of grafting graphene oxide nanoparticles to modify epoxy resins has also never been used.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Mix 30ml of tetrahydrofuran with 30ml of ethyl orthosilicate, and dropwise add 0.2ml of hydrochloric acid with a concentration of 36% by mass, stir at room temperature for 48 hours, then add 200ml of deionized water and 40 grams of sodium chloride, stir evenly, Use a separatory funnel to separate the liquid, discard the lower clear liquid, add 25 grams of anhydrous magnesium sulfate to the upper organic liquid and let stand overnight, filter to obtain SiO 2 Sol;

[0022] (2) 0.5 gram of graphite oxide is added in 50 ml of tetrahydrofuran, and dispersed for 60 min in an ultrasonic environment to form a uniformly dispersed graphene oxide solution;

[0023] (3) Take 10ml of the graphene oxide solution dispersed by ultrasound in step (2) and place it in a three-necked flask with a stirrer, a thermometer, and a condenser tube, add 5ml of TDI dropwise, heat up to 50°C for 36 hours, and then add 20ml of the step ( 1) Prepared SiO 2 Sol, continue to react for 48 hours, fi...

Embodiment 2

[0027] (1) with step (1) in embodiment 1;

[0028] (2) with step (2) in embodiment 1;

[0029] (3) with step (3) in embodiment 1;

[0030] (4) get the SiO that 0.78 gram step (3) makes 2 Add nanoparticle-grafted graphene oxide into 26 grams of epoxy resin matrix, pump air under reduced pressure, then add 7.8 grams of DDS curing agent, mix and dissolve, pour it into a steel mold coated with silicone grease, and heat it at 130 ° C for 2 hours +170°C / 2 hours +190°C / 2 hours to cure and form, that is, to obtain SiO 2 Nanoparticle grafted graphene oxide modified epoxy resin cured product;

[0031] After the SiO 2 Nanoparticle grafted graphene oxide (consumption is 3wt% of epoxy resin) modified epoxy resin, impact strength is changed from original 15.6kJ / m 2 Increased to 32.8kJ / m 2 , The thermal decomposition initiation temperature increased by 25°C.

Embodiment 3

[0033] (1) with step (1) in embodiment 1;

[0034] (2) with step (2) in embodiment 1;

[0035] (3) with step (3) in embodiment 1;

[0036] (4) get the SiO that 1.3 grams of steps (3) make 2Add nanoparticle-grafted graphene oxide to 26 grams of epoxy resin matrix, pump air under reduced pressure, then add 7.8 grams of DDS curing agent, mix and dissolve, pour it into a steel mold coated with silicone grease, and heat it at 130 ° C for 2 hours +170°C / 2 hours +190°C / 2 hours to cure and form, that is, to obtain SiO 2 Nanoparticle grafted graphene oxide modified epoxy resin cured product;

[0037] After the SiO 2 The impact strength of the epoxy resin modified by nanoparticle grafted graphene oxide (the amount is 5wt% of the epoxy resin) is increased from the original 15.6kJ / m2 to 40.7kJ / m2, and the thermal decomposition initiation temperature is increased by 32°C.

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Abstract

The invention discloses a method for grafting SiO2 nanoparticles with graphene oxide modified epoxy resin. The method comprises the following steps of: mixing ethyl orthosilicate with tetrahydrofuran, dropwise adding hydrochloric acid, stirring at the normal temperature, adding deionized water and sodium chloride, stirring uniformly, separating by using a separating funnel, removing a lower layer clear solution, adding anhydrous magnesium sulfate into an upper layer organic solution, standing over night, and filtering to obtain SiO2 sol; dropwise adding toluene diisocyanate into an ultrasonically-dispersed graphene oxide solution, adding the prepared SiO2 sol, performing suction filtration under reduced pressure, washing a product with absolute ethyl alcohol, and drying to obtain cinereous powder, i.e., SiO2 nanoparticle grafted graphene oxide; and adding the SiO2 nanoparticle grafted graphene oxide into an epoxy resin substrate, and carrying out a curing reaction to obtain a modified epoxy resin condensate. The method has the advantages of simple process, easiness in operating, environmental friendliness, simple equipment, contribution to reducing cost and applicability to mass production.

Description

Technical field: [0001] The technical field of the invention is the field of material chemistry, in particular to a SiO 2 A method for grafting graphene oxide modified epoxy resin on nanoparticles. Background technique: [0002] Graphene is composed of carbon atoms with SP 2 The single carbon atomic layer formed by hybridization has a very stable structure and has excellent mechanical properties, electrical properties and good thermal properties. Studies have found that the Young's modulus of graphene can reach 11000GPa, the fracture strength can reach 125GPa, and the thermal conductivity can reach 11000GPa. 5000W / (m·K), the theoretical specific surface area is as high as 2630m 2 / g, and has properties such as perfect quantum tunneling effect, half-integer quantum Hall effect, and never-disappearing electrical conductivity. It is the material with the highest strength known in the world. Fullerene, one-dimensional carbon nanotubes, three-dimensional graphite), the single-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/00C08K9/02C08K3/04C08K3/36C09C1/44C09C3/06
Inventor 李善荣陆绍荣徐旭刘括祁博凌日华
Owner 福州乐道知识产权运营有限公司
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