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Anisotropic conductive adhesive for RFID, and its preparation method

A technology of anisotropic conductive adhesive and conductive adhesive, which is applied in the field of preparation of anisotropic conductive adhesive for RFID, can solve problems affecting the performance of anisotropic conductive adhesive, achieve the effect of improving yield and avoiding agglomeration

Inactive Publication Date: 2015-02-11
SHANGHAI TECHSUN ANTI COUNTERFEITING TECH HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Even after demagnetization treatment, during the storage and use of the anisotropic conductive adhesive, such as magnetic pollution, it is still possible to regenerate the nickel-containing conductive particles, thereby affecting the performance of the anisotropic conductive adhesive.

Method used

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  • Anisotropic conductive adhesive for RFID, and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Gold-coated nickel powder (produced by Shanghai Tianchen Radio Frequency Co., Ltd., particle size 2.5um, gold content 5%) 20g, styrene 2g, polyvinylpyrrolidone 0.6g, volume concentration 50% ethanol aqueous solution 100g, diphenyl peroxide Add 0.2 g of formyl into a 250ml reaction flask, protect it with nitrogen, and ultrasonically disperse and dissolve in a 250W ultrasonic water bath machine, continue ultrasonic dispersion, and polymerize at a water bath temperature of 80°C for 0.5 hours, cool down to 30°C, filter and wash with ethanol, Vacuum drying to obtain the product: gold-coated nickel powder wrapped with polystyrene.

[0035] The obtained product has no obvious agglomeration observed under a 1000-fold microscope, and it can be observed that the surface of the metal micropowder is covered by a nearly transparent polystyrene layer. Analysis of the product by Soxhlet extraction with toluene showed that the mass content of the polymer was 4%.

Embodiment 2

[0037] Gold-coated nickel powder (produced by Shanghai Tesson Radio Frequency Co., Ltd., particle size 2.5um, gold content 10%) 5 grams, styrene 25 grams, polyvinylpyrrolidone 1.25 grams, 99.5% ethanol 250 grams, azobisisobutyronitrile 0.25 gram into a 500ml reaction flask, protected by nitrogen, ultrasonically disperse and dissolve in a 250W ultrasonic water bath machine, continue ultrasonic dispersion, and polymerize at a water bath temperature of 45 degrees for 12 hours, cool down to below 30 degrees, filter and wash with ethanol, and vacuum dry The product obtained: gold-coated nickel powder coated with polystyrene.

[0038] The obtained product has no obvious agglomeration observed under a 1000-fold microscope, and it can be observed that the surface of the metal micropowder is covered by a nearly transparent polystyrene layer. Analysis of the product by Soxhlet extraction with toluene showed that the mass content of the polymer was 50%.

Embodiment 3

[0040] Gold-coated nickel powder (produced by Shanghai Tesson Radio Frequency Co., Ltd., particle size 1um, gold content 20%) 5 grams, styrene 10 grams, polyvinylpyrrolidone 2 grams, 70% ethanol aqueous solution 200 grams, azobisisobutyronitrile 0.5 Add gram into a 500ml reaction flask, protect with nitrogen, ultrasonically disperse and dissolve in a 250W ultrasonic water bath machine, continue ultrasonic dispersion, and polymerize at a water bath temperature of 60°C for 3 hours, cool down to below 30°C, filter and wash with ethanol, and vacuum dry The product obtained: gold-coated nickel powder coated with polystyrene.

[0041] The obtained product has no obvious agglomeration observed under a 1000-fold microscope, and it can be observed that the surface of the metal micropowder is covered by a nearly transparent polystyrene layer. Analysis of the product by Soxhlet extraction with toluene showed that the mass content of the polymer was 30%.

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Abstract

The invention discloses an anisotropic conductive adhesive for RFID, and its preparation method. The anisotropic conductive adhesive for RFID is composed of conductive particles dispersed in epoxy resin and a curing agent, and the conductive particles include gold coated nickel powder and a polymer coated and polymerized outside the gold coated nickel powder through ultrasonic dispersion. A layer of the polymer is polymerized and coated on the gold coated nickel powder through ultrasonic dispersion via a polymerization technology to isolate the gold coated nickel powder, so the agglomeration of the gold coated nickel powder is effectively avoided; and the layer of the polymer is molten and flows during heating curing, and has no influences on the conduction of the conductive particles and electrodes, so the yield of RFID label bonded chips is improved.

Description

technical field [0001] The invention relates to a preparation method of conductive adhesive, in particular to a preparation method of anisotropic conductive adhesive for RFID. Background technique [0002] Anisotropic Conductive Film (ACF), usually composed of adhesives and conductive particles, uses conductive particles to connect the electrodes between the IC chip and the substrate to make them conductive, and at the same time avoid the gap between two adjacent electrodes. Conduction and short circuit between them, so as to achieve the purpose of conduction only in the Z-axis direction. [0003] Among them, the conductive particles are usually composed of metal particles or polymer microspheres coated with conductive metal. Compared with metal microspheres, the conductive performance of metal-coated polymer microspheres is still poor. Therefore, metal microspheres such as nickel powder and gold-coated nickel powder are still used as conductive particles for fields that r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J11/04C09J11/08C09J9/02C09J163/02C09C1/62C09C3/10C08F112/08
Inventor 徐良衡姚红兵杨凯韩冰
Owner SHANGHAI TECHSUN ANTI COUNTERFEITING TECH HLDG
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