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Polyamide/oxidized graphite composite material with high conduction performance and preparation method thereof

A composite material and polyamide technology, which is applied in the field of polyamide composite materials with high electrical conductivity and its preparation, can solve the problems of insufficient exfoliation of the expanded graphite layer, easy collapse of expanded graphite, limited application of expanded graphite, etc. The effect of percolation threshold, abundant mineral resources, and little influence on mechanical properties

Inactive Publication Date: 2009-12-23
TORAY IND INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the one hand, the exfoliation between expanded graphite layers is insufficient, the shape is fluffy, and there is obvious adhesion between layers; on the other hand, expanded graphite is prone to collapse under the action of external force, and the expanded nano-scale graphite sheets will bond to each other, and the specific surface area is greatly reduced.
Therefore, the application of expanded graphite in the field of improving the conductivity of graphite composites is limited.

Method used

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  • Polyamide/oxidized graphite composite material with high conduction performance and preparation method thereof
  • Polyamide/oxidized graphite composite material with high conduction performance and preparation method thereof
  • Polyamide/oxidized graphite composite material with high conduction performance and preparation method thereof

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preparation example Construction

[0047] The preparation method of graphite oxide is:

[0048] Take 400 parts by mass of 98% concentrated sulfuric acid and place it in an ice bath, add 10 parts by mass of natural flake graphite, 5 parts by mass of sodium nitrate, and 30 parts by mass of potassium permanganate, keep stirring for 1 hour during this process, and prevent the mixture The temperature exceeds 20°C. The ice bath was removed, and the mixture was kept in a water bath at 35°C for 4 hours. It was diluted with 500 parts by mass of deionized water, and the temperature of the mixture was maintained at 90° C. for 15 minutes. Dilute with 900 parts by mass of deionized water, add 60 parts by mass of hydrogen peroxide and filter while hot. Wash with deionized water until SO-free 4 2- Ion can.

[0049] Among them, the particle size of natural flake graphite used as raw material is between 103 and 106 mesh. The thickness of the graphite oxide flakes obtained after oxidation and peeling is 1-20 nanometers, an...

Embodiment 1

[0051] Mix 0.25-5 parts by mass of graphite oxide, 100 parts by mass of caprolactam, and 6 parts by mass of 6-aminocaproic acid, and perform ultrasonic vibration treatment at 80° C. for 3 hours to obtain a premix.

[0052] Dry the premix for 2 hours under the condition of vacuum degree of 0.1MPa, after 2 hours of prepolymerization at 180°C and nitrogen atmosphere, polymerize at 250°C and nitrogen atmosphere for 8 hours, discharge under nitrogen atmosphere, and granulate , The product is obtained after extraction and drying.

[0053] Measure the conductivity of the product with a megger or a four-electrode method, and the volume conductivity of the product is listed in Table 1.

[0054] Table 1 Conductivity of composite materials without dispersion medium

[0055]

Embodiment 2

[0059] 1.5 parts by mass of graphite oxide, 100 parts by mass of caprolactam, and 6 parts by mass of 6-aminocaproic acid were mixed, and the dispersion medium was 0-300 parts by mass. After ultrasonic vibration treatment at 80° C. for 3 hours, the premix was obtained.

[0060] Dry the premix for 2 hours under the condition of vacuum degree of 0.1MPa, after 2 hours of prepolymerization at 180°C and nitrogen atmosphere, polymerize at 250°C and nitrogen atmosphere for 8 hours, discharge under nitrogen atmosphere, and granulate , The product is obtained after extraction and drying.

[0061] Measure the conductivity of the product with a megger or a four-electrode method, and the volume conductivity of the product is listed in Table 2.

[0062] Table 2 Conductivity of composites using different dispersion media

[0063]

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Abstract

The invention discloses a polyamide / graphite composite material with high conduction performance and a preparation method thereof. The composite material consists of a polyamide substrate and nanometer graphite and is prepared through in-situ polymerization. The nanometer graphite has high diameter-to-thickness ratio; and an effective conduction network can be formed in a polymer by using little nanometer graphite. With the low content of a conduction filling of the nanometer graphite, a conduction polymer material keeps original good mechanical performance. The volume conductivity of the polyamide / graphite composite material with high conduction performance can reach 8*10S / cm; and compared with a conventional natural graphite and expanded graphite conductive composite material, the polyamide / graphite composite material has excellent properties of low filling amount and high conductivity.

Description

technical field [0001] The invention belongs to the field of conductive polymer composite materials, and in particular relates to a polyamide composite material composed of polyamide / graphite oxide and having high electrical conductivity and a preparation method thereof. Background technique [0002] Polyamide is a thermoplastic engineering plastic with excellent performance and wide application. However, due to its conductivity at 10 -15 Below S / cm, the antistatic performance of the product is poor, which limits its application range. The improvement of electrical conductivity is usually achieved by adding a certain amount of conductive material, which is connected by conductive filler to form a conductive path, so that the polymer material has a certain degree of electrical conductivity. In the prior art, graphite-based conductive fillers are mostly natural graphite, expanded graphite, etc., affected by the size and agglomeration of fillers, a high amount of fillers is r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/00C08K9/00C08K3/04C08G69/04
Inventor 杜宁赵超越陈桥吴刚
Owner TORAY IND INC
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