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Conductive polyester/graphite oxide composite material and preparation method thereof

A technology for composite materials and conductive properties, applied in the field of polyester composite materials with conductive properties and its preparation, can solve the problems of reduced specific surface area, adhesion, insufficient peeling of expanded graphite layers, etc., to achieve high conductivity and low filler volume effect

Inactive Publication Date: 2012-10-17
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But it has the following problems: on the one hand, the exfoliation between the expanded graphite layers is not sufficient, the shape is fluffy, and there is obvious adhesion between the layers; on the other hand, the expanded graphite is prone to collapse under the action of external force, and the expanded nano-scale graphite sheets will stick to each other. together, the specific surface area is greatly reduced

Method used

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  • Conductive polyester/graphite oxide composite material and preparation method thereof

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preparation example Construction

[0061] The preparation method of graphite oxide is:

[0062] 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 or expanded graphite, 5 parts by mass of sodium nitrate, and 30 parts by mass of potassium permanganate, stir mechanically for 1 hour, and keep the temperature of the mixture below 20°C. The ice bath was removed, the mixed solution was placed in a water bath at 35° C. for 4 hours, and then diluted with 500 parts by mass of deionized water, and the mixed solution 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 there is no S042-ion.

[0063] Among them, the particle size of natural flake graphite or expanded graphite used as raw material is between 10 3 ~10 6 head. The thickness of the graphite oxide flakes obtained after oxidation and peeling is ...

Embodiment 1

[0065] 0.5 parts by mass of graphite oxide and 63.5 parts by mass of ethylene glycol were mixed and ultrasonically oscillated for 2.0 hours to obtain a premix. The premix was mixed with 100 parts by mass of terephthalic acid, 0.3 parts by mass of zinc acetate, and 0.024 parts by mass of cobalt acetate at 120° C., and reacted at 230° C. for 2 hours at normal pressure and 1 hour at 250° C. to obtain a prepolymer. Mix the prepolymer with 0.36 parts by mass of antimony trioxide and 0.048 parts by mass of triphenyl phosphate, the precondensation pressure is 23kPa, the temperature is 250°C, and the reaction is 1.2 hours; the precondensation pressure is 300kPa, the temperature is 270°C, and the reaction is 1.0 hours; the final polycondensation pressure was 200 Pa, the temperature was 275°C, and the reaction was carried out for 1.5 hours. The resulting product was discharged under nitrogen pressure, crushed and then transferred to a rotary evaporator. Under nitrogen protection, it was...

Embodiment 2

[0067] 1.0 parts by mass of graphite oxide, 60 parts by mass of ethylene glycol, and 6.7 parts by mass of deionized water were mixed, ultrasonically oscillated and mechanically stirred for 3.0 hours to obtain a premix. Mix the premix with 100 parts by mass of dimethyl terephthalate and 0.2 parts by mass of manganese acetate at 160°C, react at normal pressure at 160°C for 2 hours, at 190°C for 2 hours, and at 230°C for 2 hours to obtain a prepolymer . Mix the prepolymer with 0.5 parts by mass of antimony trioxide and 0.1 parts by mass of triphenyl phosphate, the precondensation pressure is 20kPa, the temperature is 250°C, and the reaction is 1.2 hours; the precondensation pressure is 280kPa, the temperature is 275°C, and the reaction is 1.0 hour; the final polycondensation pressure is 100Pa, the temperature is 280°C, and the reaction is 1.0 hour. The resulting product was discharged under nitrogen pressure, crushed and then transferred to a rotary evaporator. Under a pressure ...

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Abstract

The invention discloses a conductive polyester / graphite oxide composite material and a preparation method thereof. The composite material is prepared from the following raw materials in part by mass: 0.25 to 10 parts of graphite oxide, 100 parts of terephthalic acid or ester thereof, 60 to 200 parts of alkaline glycol, 0.01 to 3 parts of catalyst, 0.01 to 0.5 part of stabilizing agent and 0 to 100 parts of dispersant. The polyester / graphite oxide composite material of the invention is prepared by polymerizing a polyester substrate and a nano-graphite packing in situ, has the percolation threshold of 0.5 to 1.0 weight percent, can achieve the electric conductivity of 10 to 5 S / cm when graphite content is 3.5 weight percent, and compared with a conventional natural graphite conductive composite material and an expanded graphite conductive composite material, can achieve the high properties of low packing amount and high electric conductivity without adding an auxiliary substrate, and can be widely applied in the fields of conductive materials, antistatic materials, electromagnetic shielding materials, microwave absorption and the like.

Description

technical field [0001] The invention belongs to the field of conductive polymer composite materials, and specifically relates to a polyester composite material composed of polyester / graphite oxide and having conductive properties and a preparation method thereof. Background technique [0002] Polyester is a thermoplastic engineering plastic with excellent mechanical, thermal, chemical properties and economical properties. As fiber, film and engineering plastic, it is widely used in textiles, packaging, automobiles, electronics, electrical appliances and other fields. However, due to its bulk conductivity at 10 -15 Below S / cm, the product has no conductivity and poor antistatic performance, which limits its application range. The electrical conductivity of polyester is usually improved by adding a certain amount of conductive filler, and the conductive filler is connected to form a conductive path, so that the polymer material has a certain conductivity. In the prior art, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/183C08K9/00C08K3/04C08L67/02
Inventor 杜宁赵超越陈桥吴刚
Owner TORAY IND INC
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