Electromagnetic shield rubber composite material and preparation thereof

A composite material and electromagnetic shielding technology, applied in the fields of magnetic/electric field shielding, electrical components, coatings, etc., can solve problems such as increased material costs, and achieve low cost, high electromagnetic shielding performance, and the effect of suppressing electromagnetic interference

Active Publication Date: 2009-08-12
常熟紫金知识产权服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the use of a large amount of silver powder and nickel powder, the cost of the material is greatly increased

Method used

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  • Electromagnetic shield rubber composite material and preparation thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The preparation method of the electromagnetic shielding rubber composite material of the present invention, the preparation steps are as follows:

[0023] a. Mix polyaniline powder into hydroxyacrylic resin, polyaniline powder accounts for 60% of the mass of hydroxyacrylic resin, add a mixed diluent accounting for 2% of the mass of hydroxyacrylic resin, the volume ratio of butyl acetate to xylene in the mixed diluent The ratio is 2.5:7.5, and after 15 minutes of rapid stirring at a speed of 800-1200r / min, a uniformly dispersed polyaniline-acrylic coating can be obtained, and then the dried ferrite with a size of 2-5mm after alkali washing and acid washing Immerse in polyaniline-acrylic paint for 1 to 3 minutes, remove it, and dry at 140°C to obtain ferrite composite particles; the ferrite is a mixture of iron oxide and strontium ferrite, and the volume ratio of iron oxide and strontium ferrite is 1:9, iron oxide is Fe 2 o 3 ; Strontium ferrite is SrO 6Fe 2 o 3 . Am...

Embodiment 2

[0027] The preparation method of the electromagnetic shielding rubber composite material of the present invention, the preparation steps are as follows:

[0028] a. Mix the polyaniline powder into the hydroxyacrylic resin, the polyaniline powder accounts for 55% of the mass of the hydroxyacrylic resin, add a mixed diluent accounting for 2.5% of the mass of the hydroxyacrylic resin, the volume ratio of butyl acetate to xylene in the mixed diluent 3:7, stir rapidly at 800-1200r / min for 10-15min to obtain a uniformly dispersed polyaniline-acrylic coating, and then dry the iron with a size of 2-5mm after alkali washing and pickling in sequence Dip the ferrite into the polyaniline-acrylic paint for 1 to 3 minutes, remove it, and dry it at 135 to 145°C to obtain ferrite composite particles; the ferrite is a mixture of iron oxide and strontium ferrite, iron oxide and strontium ferrite The volume ratio is 2:8, iron oxide is Fe 2 o 3 ; Strontium ferrite is SrO 6Fe 2 o 3 . Among th...

Embodiment 3

[0031] Embodiment 3: The value range of the mass percentage content in this embodiment means that the quality of the raw materials can be selected within the content range, and various combination relationships can be formed in this embodiment.

[0032] A preparation method of electromagnetic shielding rubber composite material, the preparation steps are as follows:

[0033]a. Mix polyaniline powder into hydroxyacrylic resin, polyaniline powder accounts for 55% to 66% of the mass of hydroxyacrylic resin, add a mixed diluent accounting for 5% to 2.5% of the mass of hydroxyacrylic resin, and the mixed diluent is butyl acetate A mixture of ester and xylene in a volume ratio of 2:8 to 3:7 is stirred rapidly at a speed of 800 to 1200r / min for 10 to 15 minutes to obtain a uniformly dispersed polyaniline-acrylic coating, which is then subjected to alkali washing, After pickling, the dried ferrite with a size of 2-5 mm is immersed in polyaniline-acrylic paint for 1-3 minutes, then tak...

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Abstract

The invention provides a rubber composite material with good electromagnetic shielding performance and a preparation method thereof. The material has characteristics of low cost and high electromagnetic shielding performance. The composite material has magnesium alloy particles and ferrite composite particles coated with a polyaniline layers which are evenly distributed in a rubber matrix; the ferrite composite particles and the magnesium alloy particles have a volumetric ratio of 1-4:1 and volume percentage of 20-60% in the composite material; the ferrite composite particles are composed of an organic outer layer which is polyaniline and an inner core which is ferrite; the organic outer layer is 2-10mum thick, the ferrite is 2-5mm and is a mixture of ferric oxide and strontian ferrite at a volumetric ratio of 1:9-2:8; the magnesium alloy particles are made from the following compositions: 2-12% of Al, 1-5% of Zn, 0.05-0.5% of Cu, 0.01-0.05% of Sn, and Mg; and the magnesium alloy particles are 2-5mm.

Description

1. Technical field [0001] The invention relates to a rubber-based composite material containing magnets / magnesium alloy grains and a preparation method thereof, in particular to a rubber composite material with good electromagnetic shielding performance, and belongs to the technical field of composite materials. 2. Background technology [0002] In order to effectively improve the shielding of rubber materials from the interference of external magnetic fields, etc., so that rubber materials have certain functional properties such as damping, some conductive rubbers and damping rubbers have been proposed. [0003] Patent application No. 200710039852.1 provides a conductive silicone rubber with electromagnetic shielding properties. The rubber is made by filling the silicone rubber matrix with conductive and magnetically conductive media. The conductive and magnetically conductive media include silver powder 30~ 70wt%, nickel powder 0-40wt%, magnetic powder 0-40wt%. This techn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L9/06C08L23/22C08K9/04C08K3/08C08K3/10C09D133/02C09D179/02H05K9/00C22C1/02C22C23/02C22C23/04
Inventor 王玲赵浩峰
Owner 常熟紫金知识产权服务有限公司
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