Polycarbonate/polyethylene alloy conductive composite material and preparation method thereof

A conductive composite material and polycarbonate technology, which is applied to conductive materials dispersed in non-conductive inorganic materials, etc., can solve the problems of increased material cost, deterioration of physical properties, and high production cost, and achieves improved processing convenience and conductive carbon. The effect of black reduction and additive amount reduction

Active Publication Date: 2010-10-27
KINGFA SCI & TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there are still many problems in the actual production and application of conductive carbon black-filled thermoplastic conductive composites. For example, the content of conductive carbon black added in a single polymer matrix needs to reach a higher concentration to make the final composite material have good electrical conductivity
High conductive carbon black addition produces at least the following adverse consequences: 1. Increase in material cost
2. Deterioration of comprehensive physical properties of materials, especially toughness
The preparation process includes a two-step extrusion process, and the production cost is higher than that of a one-step extrusion process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The preparation of conductive polyethylene matrix: the low-density polyethylene of 0.9g / 10min with the melt flow rate of 80 kilograms, the high-structure conductive carbon black of 20 kilograms, the compound stabilizer of 0.2 kilogram (antioxidant 1010: antioxidant 168=1: 1 mass ratio) and 0.2 kilograms of calcium stearate mixed in the high mixer of rotating speed 700rpm after 10 minutes, join screw rotating speed and carry out extrusion granulation in the co-rotating twin-screw extruder of 400rpm, The melt extrusion temperature was 190°C.

[0036] 65 kilograms of polycarbonate, 30 kilograms of conductive polyethylene matrix and 5 kilograms of ethylene-butyl acrylate-glycidyl methacrylate copolymer are mixed uniformly and directly injected into the mold at a temperature of 240° C. to finally obtain the product.

[0037] The above products have very low surface resistivity, which can reach 10 5 Ω, the notched impact strength can reach 70KJ / m 2 (ISO180-93), heat distort...

Embodiment 2

[0041] The preparation of conductive polyethylene matrix: 140 kilograms of melt flow rate is the low-density polyethylene of 0.9g / 10min, the high structure conductive carbon black of 60 kilograms, the composite stabilizer of 0.5 kilogram (antioxidant 1010: antioxidant 168 =1:1 mass ratio) and 0.5 kg of zinc stearate were mixed for 10 minutes in a high mixer with 700 rev / min speeds, and then added to the co-rotating twin-screw extruder at 400 rpm for extrusion. pellets, and the melt extrusion temperature was 220°C.

[0042] 130 kg of polycarbonate, 60 kg of conductive polyethylene matrix and 10 kg of maleic anhydride grafted polyethylene were mixed uniformly and directly injected into the mold at a temperature of 280° C. to finally obtain the product.

[0043] The above products have very low surface resistivity, which can reach 10 5 Ω, the specific performance is shown in Table 2:

[0044] Table 2

[0045] performance

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Abstract

The invention discloses a polycarbonate / polyethylene alloy conductive composite material and a preparation method thereof. The polycarbonate / polyethylene alloy conductive composite material comprises the following components by weight part: 50-80 parts of polycarbonate, 10-30 parts of polyethylene resin, 6-12 parts of conductive carbon black and 2-6 part of compatibilizer. The preparation method comprises the following steps: uniformly mixing the polyethylene resin, the conductive carbon black, heat stabilizers and processing aids in a high-speed mixer, and then entering a co-rotating twin screw extruder to be melted and granulated by extrusion at a temperature of 190 DEG C and 220 DEG C; and after being uniformly mixed, the polycarbonate, the compatibilizer and the conductive polyethylene substrate are directly injected by an injection molding machine to finally obtain the product. The whole composite material of the invention has greatly reduced filling percolation value of the conductive carbon black, and has excellent overall performance. The preparation method has improved processing convenience and reduced production cost.

Description

technical field [0001] The invention relates to a polycarbonate / polyethylene alloy conductive composite material and its preparation technology. Background technique [0002] Conductive plastics have the advantages of ordinary plastics (light weight, low price, corrosion resistance, easy molding, etc.), and have metal-like conductive properties. They are ideal antistatic and electromagnetic shielding materials. [0003] The above functions are usually achieved by adding conductive fillers above the percolation threshold concentration to the plastic matrix, mainly including: conductive carbon black, metal powder, metal fiber, graphite fiber, carbon fiber, carbon nanotube, etc. Conductive carbon black is the most widely used conductive filler. [0004] However, there are still many problems in the actual production and application of conductive carbon black-filled thermoplastic conductive composites. For example, the content of conductive carbon black added in a single polyme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L69/00C08L23/06C08K13/02C08K3/04H01B1/24B29B9/06B29C47/92B29C45/00B29C48/405B29C48/92
CPCB29C48/92B29C2948/92704B29C48/04B29C2948/92895B29C48/405
Inventor 蒋智强宁方林易庆锋姜苏俊陈健宁凯军蔡彤旻龙杰明
Owner KINGFA SCI & TECH CO LTD
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