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Method for preparing composite conductive polyethylene carbon black material with improved positive temperature coefficient performance

A conductive composite material, polyethylene carbon black technology, applied in conductive materials dispersed in non-conductive inorganic materials, fibrous fillers, dyed polymer organic compounds and other directions, can solve the problem of not producing enough steric hindrance effects to stabilize It can achieve good PTC effect stability, good dispersion stability, and the effect of inhibiting agglomeration and position shift.

Inactive Publication Date: 2012-06-27
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cost of irradiation crosslinking is high, the requirements for ambient atmosphere are high, and the uniformity of crosslinking for thick samples is poor
In the method of modifying the conductive filler, the treatment of the coupling agent (surface modifier) ​​is the simplest process and the lowest cost method, but the molecular structure of the coupling agent has the following limitations: (1) Hydrophilic group (2) The lipophilic group does not have sufficient carbon chain length and cannot be dispersed in a non-aqueous dispersion system. Produce enough steric hindrance effect to play a stabilizing role

Method used

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  • Method for preparing composite conductive polyethylene carbon black material with improved positive temperature coefficient performance
  • Method for preparing composite conductive polyethylene carbon black material with improved positive temperature coefficient performance
  • Method for preparing composite conductive polyethylene carbon black material with improved positive temperature coefficient performance

Examples

Experimental program
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Effect test

Embodiment 1

[0042] The preparation method of the polyethylene carbon black conductive composite material with improved positive temperature coefficient performance comprises the following steps:

[0043] A. Preparation of titanate hyperdispersant

[0044] First, 100 g of 12-hydroxystearic acid, 1 g of antioxidant didodecanyl thiodipropionate (DLTP), 3 g of antioxidant tetrakis[methyl-β-(3,5-di tert-butyl-4-hydroxyphenyl) propionate] pentaerythritol ester (1010), 8 g of catalyst stannous octoate, and 32 g of xylene were successively added to the container, and the temperature was raised to 100 ℃, after complete dissolution, heat up to 135 ℃ and keep condensing and refluxing, separate the generated water through the water separator, react until the acid value reaches 32.5 mgKOH / g, stop the reaction; add 45 g of isooctyl alcohol (to ensure that the added isooctanol The molar ratio of octanol to 12-hydroxystearic acid is greater than 1, that is, the excess alcohol is ensured) to end-cap, sti...

Embodiment 2

[0050] The preparation method of the polyethylene carbon black conductive composite material with improved positive temperature coefficient performance comprises the following steps:

[0051] A. Preparation of titanate hyperdispersant or phosphate hyperdispersant

[0052] The raw materials used are 100 g 12-hydroxystearic acid, 1 g antioxidant didodecyl thiodipropionate (DLTP), 3 g antioxidant tetrakis[methyl-β-(3,5-ditertiary Butyl-4-hydroxyphenyl) propionate] pentaerythritol ester (1010), 5 g catalyst stannous octoate, 25 g xylene, 55 g isooctyl alcohol, 40 g tributyl phosphate; Agent; Preparation steps and processing conditions are with embodiment 1;

[0053] B, preparation of modified carbon black

[0054] Described raw material is 100 g carbon black, 3 g phosphoric acid ester hyperdispersant, makes phosphoric acid ester modified carbon black, and preparation process condition is with embodiment 1;

[0055] C, preparation of polyethylene carbon black conductive composit...

Embodiment 3

[0058] The preparation method of the polyethylene carbon black conductive composite material with improved positive temperature coefficient performance comprises the following steps:

[0059] A. Preparation of Phosphate Ester Hyperdispersant

[0060] With the preparation of phosphate ester hyperdispersant in embodiment 2

[0061] B, preparation of modified carbon black

[0062] Described raw material is 100 g carbon black, 2 g phosphoric acid ester hyperdispersant, makes phosphoric acid ester modified carbon black, and preparation process condition is with embodiment 1;

[0063] C, preparation of polyethylene carbon black conductive composite material

[0064] The raw material used is a blend of 100 g of high-density polyethylene and low-density polyethylene, the mass ratio of high-density polyethylene and low-density polyethylene is 2:1, 35 g of phosphate-modified carbon black, 0.5 g of antioxidant Tetrakis[methyl-β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]pentaerythr...

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Abstract

The invention relates to a method for preparing a composite conductive polyethylene carbon black material with improved positive temperature coefficient performance. The method comprises the following steps of: (1) preparing a hyper dispersant from 12-oxystearic acid, an antioxidant, a catalyst, dimethylbenzene and the like; (2) preparing modified carbon black from carbon black and a titanate hyper dispersant or a phosphate hyper dispersant or a mixture of the titanate hyper dispersant and the phosphate hyper dispersant; and (3) preparing the composite conductive polyethylene carbon black material from high-density polyethylene, low-density polyethylene, the modified carbon black, the antioxidant and the like. The composite conductive polyethylene carbon black material provided by the invention improves the interaction between a conductive filler and a high molecular matrix, effectively inhibits the agglomeration and the position offset of carbon black in the matrix, increases the PTC(Positive Temperature Coefficient) strength, retards the NTC (Negative Temperature Coefficient) effect, and increases the stability of PTC effect in repeated heating cycle. The method has simple process and low cost, basically causes no pollution to the environment and is convenient to popularize and apply widely.

Description

technical field [0001] The invention belongs to the technical field of polymer-based conductive composite materials, and specifically relates to a positive temperature coefficient (Positive Temperature Coefficient, PTC) formed by filling a single or blended polymer resin matrix with carbon black (CB) modified by adding a hyperdispersant Polymer-based conductive composites with improved properties. Background technique [0002] As the temperature rises, the resistivity of the material increases, and a sharp jump in switching occurs near a certain temperature value, and the material changes from a good conductor to a poor conductor or even an insulator, thus having switching characteristics. PTC (Positive Temperature Coefficient) materials based on polymers are widely used in electromagnetic wave shielding materials, antistatic, self-temperature control heating materials, current limiters, high temperature protection and sensors due to their advantages of simple processing and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K3/04C08K13/06C08L23/06C09C3/10C08G63/06C09C1/56C08K9/04C08G63/91H01B1/24
CPCY02P20/52
Inventor 徐卫兵马海红周正发汪瑾任凤梅
Owner HEFEI UNIV OF TECH
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