Omni-directional metallic-coating polyolefin conductive foam and preparation method thereof

A conductive foam and metal-plating technology, applied in the field of all-round metal-plated polyolefin conductive foam and its preparation, can solve the problems of lack, poor conductivity, uneven conductivity, etc., and achieve easy forming, stable dimensional performance, and dimensional tolerance. small effect

Active Publication Date: 2013-03-13
HUBEI XIANGYUAN NEW MATERIAL TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The volume resistivity of the existing conductive foaming materials is above 106Ω·cm, the conductivity is poor, and the conductivity is uneven
In addition, the thickness of existing polymer foam materials is more than 1 mm, and there is a lack of polymer foam materials below 1 mm.
Difficult to meet the market demand for electromagnetic shielding materials with small volume resistivity under the premise of thin thickness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] An all-round metal-plated polyolefin conductive foam for EMI protection and a preparation method thereof, comprising the following steps:

[0051] Step 1: Preparation of conductive masterbatch: Take 40Kg low-density polyethylene resin, 40Kg EPDM glue, 60Kg superconducting carbon black, 1Kg polyethylene wax, 2Kg white oil, and 0.6Kg antioxidant to the internal mixer Fully banburying in the medium for 6-8 minutes, the banburying temperature is 70-90°C, and then discharged into the two-stage mixing and granulating machine for mixing and granulating to prepare conductive masterbatch; the two-stage mixing and granulating machine Working temperature: Zone 1 90±5℃, Zone 2 100±5℃, Zone 3 110±5℃, Zone 4 120±5℃, Zone 5 130±5℃, Zone 6 120±5℃;

[0052] The second step: preparation of flame retardant masterbatch: take 40Kg EPDM rubber, 40Kg ethylene-vinyl acetate copolymer, 160Kg magnesium hydroxide, 30Kg ammonium octamolybdate, 3Kg polyethylene wax, 0.6Kg antioxidant, Add 1Kg of m...

Embodiment 2

[0062] With embodiment 1, difference is:

[0063] Step 1: Take 60Kg low density polyethylene resin, 60Kg EPDM rubber, 70Kg superconducting carbon black, 2Kg polyethylene wax, 3Kg white oil, 0.9Kg antioxidant;

[0064] The second step: take 60Kg EPDM rubber, 60Kg ethylene-vinyl acetate copolymer, 200Kg magnesium hydroxide, 40Kg ammonium octamolybdate, 5Kg polyethylene wax, 0.9Kg antioxidant, 2Kg methyl phenyl silicone oil;

[0065] Step 3: Take 60Kg low-density polyethylene resin, 60Kg EPDM rubber, 50Kg AC foaming agent, 2Kg talcum powder, 2Kg zinc stearate, 3Kg polyethylene wax, 0.8Kg antioxidant;

[0066] Step 4: Take 50Kg low density polyethylene resin, 50Kg ethylene-vinyl acetate copolymer, 5Kg conductive masterbatch, 30Kg flame retardant masterbatch, 20Kg foam masterbatch, 3Kg polyethylene wax, 0.8Kg antioxidant, 0.5 Kg TMPTMA.

[0067] Main performance data: 1. Force value, longitudinal / horizontal, 6.02 / 3.88N; 2. Tensile strength, longitudinal / horizontal, 3.06 / 2.36MPa; ...

Embodiment 3

[0069] With embodiment 1, difference is:

[0070] Step 1: Take 50Kg low density polyethylene resin, 50Kg EPDM rubber, 65Kg superconducting carbon black, 1.5Kg polyethylene wax, 2.5Kg white oil, 0.75Kg antioxidant;

[0071] The second step: take 50Kg EPDM rubber, 50Kg ethylene-vinyl acetate copolymer, 170Kg magnesium hydroxide, 35Kg ammonium octamolybdate, 4Kg polyethylene wax, 0.75Kg antioxidant, 1.5Kg methyl phenyl silicone oil ;

[0072] Step 3: Take 50Kg low-density polyethylene resin, 50Kg EPDM rubber, 45Kg AC foaming agent, 1.05Kg talcum powder, 1.5Kg zinc stearate, 2.5Kg polyethylene wax, 0.65Kg antioxidant;

[0073] Step 4: Take 40Kg low density polyethylene resin, 40Kg ethylene-vinyl acetate copolymer, 4Kg conductive masterbatch, 25Kg flame retardant masterbatch, 15Kg foam masterbatch, 2.5Kg polyethylene wax, 0.65Kg antioxidant, 0.4Kg TMPTMA.

[0074] Main performance data: 1. Force value, longitudinal / horizontal, 5.82 / 3.70N; 2. Tensile strength, longitudinal / horizo...

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Abstract

The invention relates to electro-magnetic interference (EMI) protection omni-directional metallic-coating polyolefin conductive foam and a preparation method thereof. The preparation method comprises the following steps of: preparing conductive master batches, preparing flame retardant master batches, preparing foamed master batches, extruding sheets, carrying out radiation crosslinking on the sheets, foaming the sheets, bonding conductive non-woven fabrics, punching the foam and electroplating the foam. The conductive foam provides effective EMI shielding, has the advantages of high conductivity, ultra-thin type, light weight, corrosion resistance, attractive appearance and the like, is easy to shape; the surface of the conductive foam can conduct electricity, and the whole material is conducted from top to bottom; and the conductive foam has omni-directional electrical conductivity, and has the thickness of 0.10-0.50mm. The conductive foam disclosed by the invention is widely applied to electronic products such as a personal digital assistant (PDA) palm computer, a liquid crystal display (LCD), a mobile phone, a digital television, a notebook computer and a digital camera.

Description

technical field [0001] The invention relates to an all-round metal-plated polyolefin conductive foam for EMI protection and a preparation method thereof. Background technique [0002] EMI: That is, electromagnetic interference. EMI protection means that an electronic device neither interferes with other devices nor is it affected by other devices. [0003] Electronic products such as PDAs, LCDs, mobile phones, digital TVs, notebook computers, and digital cameras are extremely susceptible to external electromagnetic interference during work, causing them to malfunction, generate noise, and affect communication quality. Shielding materials use the reflection or absorption of materials to reduce EMI radiation. Effective filling of shielding materials can reduce or eliminate unnecessary gaps, suppress electromagnetic coupling radiation, and reduce electromagnetic leakage and interference. Materials with high conductivity and magnetic properties can be used as electromagnetic s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/12B32B27/32B32B7/12C08J3/28C08J3/24C08J9/10C08L23/06C08L23/08C08L23/16C08K13/02C08K3/04C08K3/22C08K3/24C08K3/34C08K5/098
Inventor 魏琼
Owner HUBEI XIANGYUAN NEW MATERIAL TECH INC
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