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Preparation method of high-electric-conductivity graphene/natural rubber nano-composite

A nano-composite material, natural rubber technology, applied in the field of preparation of conductive rubber nano-composite materials, can solve the problems of time-consuming, limited industrial application, difficult to control, etc.

Active Publication Date: 2016-06-22
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to current reports, the latex blending method is first based on the preparation of graphene aqueous or organic solutions, which is time-consuming and difficult to control, which limits its industrial application.

Method used

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  • Preparation method of high-electric-conductivity graphene/natural rubber nano-composite
  • Preparation method of high-electric-conductivity graphene/natural rubber nano-composite
  • Preparation method of high-electric-conductivity graphene/natural rubber nano-composite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0019] 0.2L, 0.6L, 1.0L, 1.6L, 2.0L, 2.4L of 0.5wt% graphene oxide aqueous solution (the contained graphene oxide quality is respectively 1g, 3g, 5g, 8g, 10g, 12g ) into the 167g natural rubber latex. After stirring evenly, add 20g sulfur water dispersion (10wt%), 100g ZnO water dispersion (1.0wt%) and 100g ZDC (1.0wt%) water dispersion and continue stirring. Pour the uniformly stirred mixed solution into a petri dish and place it in a blast drying oven at 50°C for 24h. The prepared membrane was directly soaked in hydroiodic acid solution (57wt%) for 8 hours at room temperature. After cleaning with deionized water, the membrane was dried again in a blast drying oven at 50 °C for 2 h. The filling volume fractions of graphene in the prepared composite materials are 0.25vol%, 0.75vol%, 1.25vol%, 2.00vol%, 2.50vol%, 3.00vol%, respectively. The electrical conductivity of each sample before and after reduction is shown in Table 1.

comparative example 1

[0021] Put 100g of solid natural rubber in an internal mixer at 60°C, add graphene powders with a mass of 0.6g, 1.8g, 3.0g, 4.8g, 6.0g, and 7.2g, respectively, and knead for 10 minutes. After adding 2g of sulfur, 1g of ZnO and 1g of solid vulcanization aids such as ZDC, continue mixing for 5 minutes. The mixed rubber was vulcanized on a flat vulcanizing machine with a temperature of 143°C and a pressure of 15MPa. The filling volume fractions of graphene in the prepared composite materials are 0.25vol%, 0.75vol%, 1.25vol%, 2.00vol%, 2.50vol%, 3.00vol%, respectively. The electrical conductivity of each sample is shown in Table 1.

comparative example 2

[0023] Hydrazine hydrate reduced graphene oxide (mass ratio: 7:10) to prepare a graphene aqueous solution with a concentration of 0.05 wt%. With 167g natural latex respectively with 1.2L, 3.6L, 6.0L, 9.6L, 12.0L, the graphene aqueous solution of 14.4L (the quality of contained graphene is respectively 0.6g, 1.8g, 3.0g, 4.8g, 6.0g , 7.2g) were mixed, stirred evenly and flocculated with 1wt% dilute hydrochloric acid. The volume fractions of graphene in the prepared composite materials were 0.25vol%, 0.75vol%, 1.25vol%, 2.00vol%, 2.50vol%, 3.00vol%, respectively. 2g of sulfur, 1g of ZnO and 1g of ZDC and other solid vulcanization aids are added through the mill. The mixed rubber was vulcanized on a flat vulcanizing machine with a temperature of 143 °C and a pressure of 15 MPa. The conductivity of the tested samples is shown in Table 1.

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Abstract

A preparation method of a high-electric-conductivity graphene / natural rubber nano-composite is applicable to the field of strain-sensitive sensors, solvent-sensitive sensors and other sensors. The preparation method includes: first, preparing graphene oxide / natural rubber nano-composite by means of solution film-spreading, and reducing in situ graphene oxide in the composite at room temperature by using hydrogen iodate; the prepared graphene / natural rubber composite has three-dimensionally continuous graphene conductive grid structure and has very low conductivity threshold and excellent conductivity. The problem that the graphene oxide easily aggregate during reduction and graphene is difficult to disperse in a rubber matrix, and a preparation technology is greatly simplified.

Description

technical field [0001] The invention relates to a preparation method of a conductive rubber nanocomposite material, belonging to the technical field of conductive rubber preparation. Background technique [0002] Different from common metal-based and plastic-based conductive composite materials, conductive rubber composite materials exhibit excellent elasticity, stretchability and flexibility, and are widely used in energy storage, electromagnetic shielding, artificial skin, sensors and other fields. It has a wide range of uses and broad market prospects in many fields of national defense and military industry. Filling metal powder such as silver, aluminum silver plating, etc. is a common preparation method for preparing conductive rubber. The disadvantage is that a high filling amount (percolation threshold as high as 40% to 50%) is required to achieve the required conductivity. Due to the higher filling content, the composite material has high density, high cost and low m...

Claims

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Application Information

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IPC IPC(8): C08L7/00C08J7/14C08J5/18C08K13/06C08K9/00C08K3/04C08K3/22
CPCC08J5/18C08J7/14C08J2307/00C08K3/04C08K3/22C08K9/00C08K13/06C08K2003/2296C08K2201/001C08L7/00C08L2203/16
Inventor 吴友平董彬张立群
Owner BEIJING UNIV OF CHEM TECH
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