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Preparation method of conductive EPP foam with isolation structure

An isolation structure and foam technology, which is applied in the field of conductive and electromagnetic shielding materials, can solve problems such as limited foaming ratio and molding process challenges, and achieve good shielding performance, simple process, and extended service life.

Pending Publication Date: 2022-02-01
成都佳驰电子科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the non-conductive properties of EPP beads, limited by its expansion ratio and molding process challenges, the preparation method of developing conductive EPP foam is still in the exploratory stage

Method used

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  • Preparation method of conductive EPP foam with isolation structure

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: a kind of preparation method of the conductive EPP foam with isolation structure, it may further comprise the steps:

[0025] S1. Preparation of conductive paste: add conductive agent, liquid high molecular polymer and additives into a high-speed disperser for dispersion. The speed of the high-speed disperser is 400 r / min. After dispersing for 1 hour, take out the paste and let it stand for 1 hour Carry out defoaming afterward, make conductive paste;

[0026] Wherein, the conductive agent is a mixture of graphite, nickel-coated carbon fiber carbon black, iron powder and flake iron-nickel alloy powder in any proportion; the liquid polymer is polyurethane resin, ethylene-vinyl acetate copolymer and water-soluble modified The mixing of polypropylene in any proportion; the auxiliary agent is the mixing of dispersant, wetting agent, thickener and defoamer;

[0027] In the conductive paste, the mass fraction of the solid content of the liquid polymer is 0.1%, t...

Embodiment 2

[0030] Embodiment 2: a kind of preparation method of the conductive EPP foam with isolation structure, it may further comprise the steps:

[0031] S1. Preparation of conductive paste: Add conductive agent, liquid high molecular polymer and additives into a high-speed disperser for dispersion. The speed of the high-speed disperser is 600 r / min. After dispersing for 1 hour, take out the paste and let it stand for 1 hour Carry out defoaming afterward, make conductive paste;

[0032] Wherein, the conductive agent is a mixture of carbon nanofibers, graphite nanosheets, graphene and flake iron-based metal powder in any proportion; the liquid polymer is acrylic resin, epoxy resin and styrene-acrylic emulsion in any proportion Mixing; the auxiliary agent is a dispersant, a wetting agent, a thickener and a defoamer;

[0033] In the conductive paste, the mass fraction of the solid content of the liquid polymer accounts for 30%; the mass fraction of the solid content of the dispersant a...

Embodiment 3

[0036] Embodiment 3: a kind of preparation method of the conductive EPP foam with isolation structure, it may further comprise the steps:

[0037]S1. Preparation of conductive paste: Add conductive agent, liquid high molecular polymer and additives into a high-speed disperser for dispersion. The speed of the high-speed disperser is 500 r / min. After dispersing for 1 hour, take out the paste and let it stand for 1 hour Carry out defoaming afterward, make conductive paste;

[0038] Wherein, the conductive agent is nickel-coated carbon fiber carbon black; the liquid polymer is a mixture of epoxy resin and polyvinylpyrrolidone with a weight ratio of 1:2; the auxiliary agent is a dispersant, a wetting agent, a thickener agent and defoamer;

[0039] In the conductive paste, the mass fraction of the solid content of the liquid polymer is 12%; the mass fraction of the solid content of the dispersant is 1%, and the mass fraction of the solid content of the wetting agent is 0.8%. The m...

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Abstract

The invention discloses a preparation method of conductive EPP foam with an isolation structure, and belongs to the technical field of conductive and electromagnetic shielding materials. The method comprises the steps of preparing conductive slurry and preparing the conductive EPP foam. A conductive isolation structure is constructed on the surface of the EPP, so that the conductive functionalization of the foam material is realized, the resistance of the conductive EPP foam finished product is tested to be about 10<2>-10<3> ohms through a universal meter, and the thickness of the conductive layer can be controlled by controlling the concentration, the dosage and the blending mode of slurry. The conductive EPP foam prepared by the method prolongs the service life of a structural member, and has the excellent characteristics of temperature resistance, weather resistance, moisture resistance, powder falling resistance, good shielding effectiveness and the like. According to the method, existing equipment is adopted, the process is simple, preparation is convenient, continuous production of the conductive EPP foam product can be achieved, and the method is suitable for industrial large-scale production.

Description

technical field [0001] The invention relates to the technical field of conductive and electromagnetic shielding materials, in particular to a preparation method of a conductive EPP foam with an isolation structure. Background technique [0002] With the application of 5G technology, sub 6 GHz, millimeter wave, terahertz and other frequency bands are constantly being applied in practice. The electromagnetic shielding and electromagnetic compatibility problems of the new scene frequency band need to be solved urgently, and the demand for functional conductive foam is also increasing. At present, the commonly used conductive foam substrate is mainly polyurethane polymer substrate, which has the advantages of light weight, good elasticity, easy processing and cutting, and low price. The most basic functional requirement of foam materials used in electromagnetic shielding and electromagnetic compatibility application scenarios is to conduct electricity. performance. Through the...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08L33/00C08L63/00C08L25/14C08L75/04C08L23/08C08L23/26C08L39/06C08K3/04C08K7/06C08K3/08C08K7/00C08J9/224C08J9/228
CPCC08J9/224C08J9/228C08J9/0066C08J9/0076C08J9/009C08J9/0071C08J9/0061C08J2323/12C08J2433/00C08J2463/00C08J2425/14C08J2475/04C08J2423/08C08J2423/26C08J2339/06C08K3/04C08K9/02C08K7/06C08K2003/0856C08K7/00C08K2003/0862C08K3/046C08K3/042
Inventor 聂隽李维佳欧阳林峰谢海岩张宏亮陈良
Owner 成都佳驰电子科技股份有限公司
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