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Preparation and application of RFID antenna-based inkjet conductive ink

A conductive ink and ink technology, applied in applications, inks, household utensils, etc., can solve the problems of uneven distribution, easy agglomeration, agglomeration and uneven distribution of nano-metal particles, and achieve simplified production process, simple experimental process, and substrate wide range of effects

Inactive Publication Date: 2015-08-19
TIANJIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nano-scale metal particles have high surface energy and are prone to agglomeration to form large silver clusters. During inkjet printing, it is easy to block the nozzle and increase the production cost of the product; in some inks, the distribution of nano-metal particles is not uniform enough. When inkjet printing is used to make conductive graphics, the lines formed by ink deposition on the printing substrate will inevitably have certain gaps after sintering, which reduces the conductivity of conductive graphics; in order to solve the problem of agglomeration and uneven distribution of nano-metal particles For problems, stabilizers, protective agents, coupling agents, dispersants, surfactants and other additives can be added to it, but the addition of additives increases the sintering temperature and sintering time of the ink to a certain extent, thereby increasing the Energy consumption, which limits the choice of substrates and poses problems for application safety

Method used

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  • Preparation and application of RFID antenna-based inkjet conductive ink
  • Preparation and application of RFID antenna-based inkjet conductive ink
  • Preparation and application of RFID antenna-based inkjet conductive ink

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] At room temperature, dissolve 7.0g of sodium citrate in 100ml of deionized water, dissolve 10.2g of silver nitrate in 100ml of deionized water, and fully dissolve until it becomes a colorless and transparent solution. Put the silver nitrate solution in a constant burette, then slowly add it dropwise into the sodium citrate solution, stir while adding dropwise, a white precipitate will precipitate immediately. Continue to stir for 1 h after the dropwise addition is completed, then select a filter membrane with a pore size of 0.45 micron, vacuum filter, and wash twice with deionized water and ethanol respectively. After the suction filtration is completed, place the precipitate in an electric blast drying oven at 35°C and dry it in the dark for 12 hours to obtain a dried white solid, which is then ground into a white powder with a mortar.

[0027] Mix 10.0g of ethanol and 6.0g of ammonia water evenly, add 0.6g of silver citrate while stirring until completely dissolved to...

Embodiment 2

[0030] The preparation method of silver citrate is with embodiment one.

[0031] Mix 4.5g of ethanol, 1.5g of deionized water and 2.0g of ethylenediamine evenly, add 2.5g of silver citrate while stirring, until it is completely dissolved to obtain a brown transparent solution, add 0.5g of sodium citrate, 0.3g of carboxymethyl Base cellulose sodium, 0.5g succinic acid to adjust the viscosity and surface tension of the ink. Particle-free conductive ink can be obtained after filtering through a 0.2μm filter membrane. See attached figure 1 .

[0032] The ink has a viscosity of 5.28cp and a surface tension of 32.3dyn / cm. The ink was coated on the PET film, and after being sintered at a certain temperature for a period of time, the square resistance of the conductive film was measured to be 3.83Ω / □. Inkjet printing for RFID antennas.

Embodiment 3

[0034] The preparation method of silver citrate is with embodiment one.

[0035] Mix 7.0g of ethanol, 3.5g of ethylene glycol and 8.0g of sec-butylamine evenly, add 5.0g of silver citrate while stirring until completely dissolved to obtain a light yellow transparent solution, add 0.5g of sodium citrate, 0.15g of ethyl cellulose element, 0.3g malic acid to adjust the viscosity and surface tension of the ink. Particle-free conductive ink can be obtained after filtering through a 0.2μm filter membrane.

[0036] The ink has a viscosity of 5.83cp and a surface tension of 25.3dyn / cm. Using this ink to make an RFID antenna on PET by inkjet printing equipment. After sintering at a certain temperature for a period of time, the square resistance of the antenna was measured to be 1.49Ω / □ with the RTS-5 dual electric measuring four-probe tester. See attached figure 2 .

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Abstract

The invention relates to a preparation method of RFID antenna-based inkjet conductive ink, and also relates to the making of an RFID antenna by utilizing the ink. The preparation process of the ink mainly comprises the following steps: preparing by simple ion exchange reaction to obtain silver source precursor precipitates, filtering by a special aperture filter membrane, drying, and grinding to obtain silver source precursor powder; sufficiently mixing a complexing agent, an additive and other auxiliaries in virtue of a magnetic stirrer to obtain homogeneous solution; adding the silver source precursor powder with a small amount into the solution for multiple times, and sufficiently dissolving and reacting to obtain the clear and transparent solution, namely the particle-free conductive ink. Then the RFID antenna is obtained by making in an inkjet printing way. The prepared particle-free conductive ink does not contain any solid particle per se, so particle agglomeration cannot occur, and spray nozzle jamming cannot be caused; the particle dispersion problem does not exist as well, and after sintering, a uniform and compact conductive silver membrane can be formed on the surface of a printed base material, so better matching between the ink and an inkjet print head can be realized.

Description

technical field [0001] The invention relates to a preparation method of particle-free conductive ink and an RFID antenna. Background technique [0002] RFID, that is, radio frequency identification technology, is a non-contact automatic identification technology based on the radio frequency principle, which is currently widely used in the industrial field. The RFID system mainly consists of electronic tags, readers, antennas and middleware. Among them, the production of electronic tag antennas is currently more popular in China. The manufacturing technologies mainly include etching, electroplating and direct printing, and etching and electroplating are the main methods. However, these two methods are relatively complicated in process, take a long time to manufacture the finished product, and need to consume metal materials, so the cost is relatively high. In addition, during the antenna manufacturing process, a large amount of waste liquid containing metals and chemical su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D11/30C09D11/52
CPCC09D11/30C09D11/52
Inventor 赵秀萍郑西龙
Owner TIANJIN UNIV OF SCI & TECH
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