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Method for preparing polymer-based conducting composite material by melt blending

A conductive composite material, melt blending technology, applied in the direction of conductive materials dispersed in non-conductive inorganic materials, etc., can solve the problems of application limitations, blend shape affecting processing performance, melt strength change, etc. Low permeation value, good electrical conductivity and high utilization rate

Active Publication Date: 2012-09-19
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the size of the conductive percolation threshold is related to the dispersion of fillers in one of the phases. At the same time, the aggregation of fillers in one phase will lead to changes in the melt strength during processing, which will affect the processing performance and the shape of the blend. Its application limited

Method used

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  • Method for preparing polymer-based conducting composite material by melt blending
  • Method for preparing polymer-based conducting composite material by melt blending
  • Method for preparing polymer-based conducting composite material by melt blending

Examples

Experimental program
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Effect test

Embodiment 1

[0025] A method for preparing a polymer-based conductive composite material by melt blending, the steps of which are:

[0026] 1) Selection of raw materials: select multi-walled carbon nanotubes with an average diameter of 100nm and an average length of 10 μm as conductive fillers, and then select viscosity=7.9×10 3 Polylactic acid (PLA) of Pa·S is used as polymer one, and the viscosity η=5.2×10 1 Pa·S ethylene-vinyl acetate copolymer (EVA) as polymer di(η 聚合 物一 / η 聚合物二 >100); polylactic acid and ethylene-vinyl acetate copolymer are chemically incompatible polymers.

[0027] 2) Calcining the conductive filler carbon nanotubes, the parameters of the calcination are: the time is 1 h, and the temperature is 1000°C.

[0028] 3) Melt blending: Melt blend the calcined conductive filler with polymer one first, the melting temperature of polymer one (polylactic acid) is 140-160°C, the blending conditions are: the blending temperature is 190°C, and the blending temperature is 190°C...

Embodiment 2

[0037] 1) Selection of raw materials: choose graphite with an average diameter of 500nm and an average length of 3 μm as a conductive filler, and choose a viscosity η=7.9×10 3 Polylactic acid (PLA) of Pa·S is used as polymer one, and the viscosity η=5.2×10 1 Pa·S ethylene-vinyl acetate copolymer (EVA) as polymer di(η 聚合物一 / η 聚合物二 >100); chemical properties of polylactic acid and ethylene-vinyl acetate copolymer are incompatible.

[0038] 2) Calcining the conductive filler graphite; the parameters of the calcination are: the time is 3 hours, and the temperature is 600°C.

[0039] 3) Melt blending: Melt blend the calcined conductive filler with polymer one first, the melting temperature of polymer one (polylactic acid) is 140-160°C, the blending conditions are: temperature 190°C, time 5min , the mass ratio of conductive filler to polymer 1 is 1:100. The masterbatch is obtained after cooling and solidifying at the conductive temperature.

[0040] Then the masterbatch is melt...

Embodiment 3

[0042] 1) Selection of raw materials: Single-walled carbon nanotubes with an average diameter of 200 nm and an average length of 20 μm are selected as conductive fillers. Select ethylene-vinyl acetate copolymer with low affinity with conductive filler as polymer 1, and polylactic acid with high affinity with conductive filler as polymer 2. Theoretical wetting coefficient of the blend system composed of these three materials ω a =3.52>1, where γ represents the interfacial tension between the two phases; and the selected polymer one and polymer two are chemically incompatible polymers.

[0043] 2) Calcining the conductive filler carbon nanotubes; the parameters of the calcination are: the time is 6 hours, and the temperature is 1000°C.

[0044] 3) Melt blending: Melt blend the calcined conductive filler with polymer one first. The melting temperature of polymer one (ethylene-vinyl acetate copolymer) is 70-90°C. The blending conditions are: the temperature is 120 °C, the time...

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Abstract

A method for preparing polymer-based conducting composite material by melt blending comprises the steps of (1) selecting a carbon nano tube or graphite to serve as a conducting filler, or selecting a first polymer or a second polymer, and enabling the viscosity ratio between the first polymer and the second polymer to be not smaller than 100; or enabling the first polymer to be low in affinity with the conducting filler, enabling the second polymer to be high in affinity with the conducting filler, the theoretic infiltration coefficient omega a of a blending system formed by the conducting filler, the first polymer and the second polymer to be larger than 1, enabling gamma to represent interfacial tension between two phases, and enabling the first polymer and the second polymer to be incompatible in chemical property; (2) performing calcination or acidizing treatment to the conducting filler; and (3) enabling the conducting filler to first undergo melt blending with the first polymer, obtaining a master batch, enabling the master batch to undergo melt blending with the second polymer, and obtaining the polymer-based conducting composite material. According to the method, the consumed quantity of the conducting filler is low, and the prepared conducting composite material is good in conducting performance and strong in mechanical property.

Description

technical field [0001] The invention belongs to the technical field of preparation of polymer-based conductive composite materials. Background technique [0002] Polymer-based conductive composite materials refer to conductive composite materials prepared by adding conductive substances (conductive fillers) such as carbon black, carbon fiber, carbon tube, graphite, and metal powder to an intrinsically non-conductive polymer matrix. This kind of conductive polymer has low cost, high stability, easy processing and molding, and the electrical properties can be adjusted in a wide range. It has a wide range of applications in the fields of antistatic, electromagnetic wave shielding, fuel cell bipolar plates, sensors, conductive coatings, etc. . The conductive mechanism is that when the content of the conductive filler exceeds a certain critical value (ie, the conductive percolation value), the conductive filler forms a continuous network in the polymer, and electrons are transpo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L101/00C08L67/04C08L23/08C08L77/02C08L23/06C08L69/00C08L55/02H01B1/24C08K9/00C08K9/02C08K7/00C08K3/04C08J3/22
Inventor 王勇石云云杨静晖黄婷张楠
Owner SOUTHWEST JIAOTONG UNIV
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