CN103224739B - Low-temperature sintering water-based conductive printing ink for radio frequency identification (RFID) electronic tag antenna, and preparation method of printing ink - Google Patents

Abstract

The invention provides a preparation method of low-temperature sintering water-based conductive printing ink for a radio frequency identification (RFID) electronic tag antenna. The preparation process comprises the following steps of: mixing sheet-like silver coated copper powder and nanosilver powder uniformly; and mixing, grinding and rolling conductive fillers, water-based connecting materials, solvents, aids and the like, and grinding to certain fineness to obtain the conductive printing ink for the RFID electronic tag antenna. The printing ink is formed on the basis of grinding the water-based connecting materials, and has the characteristics of environment friendliness, energy conservation, easiness in washing and the like; and the conductive fillers adopt a nanosilver powder and sheet-like silver coated copper powder combining method, so the manufacturing cost of the RFID tag antenna can be reduced while low-temperature sintering curing is realized.

Description

A kind of frequency identification electronic label antenna low-temperature sintering type water-soluble conducting ink and preparation method thereof

Technical field

The present invention designs a kind of frequency identification electronic label antenna low-temperature sintering type water-soluble conducting ink and preparation side thereof.Background technology

RFID(radio frequency recognizing electronic label) technology U.S. of being born in the thirties in 20th century, through the development of over half a century, many radio frequency identification application systems start expansion in the whole world, radio frequency identification card, wireless radio frequency identification mark are used in the whole world.A major reason of current limit RFI D technology widespread use is at home Cost Problems.

In order to adapt to the development of RFID label antenna printing technology, the low conductive nano ink of a kind of sintering temperature has been prepared by Nanopowders Ind Ltd. in 2003, its resistance is in 0.005 ~ 5 ohm-sq, constantly there is people in nano ink, propose new innovation afterwards, independently prepare nano-silver powder as Shanghai Yijin Nano Technology Co., Ltd. and directly apply to the preparation of electrically conductive ink, its ink sinters under 50 DEG C ~ 150 DEG C conditions, and specific conductivity is greater than 1mS/cm.Based on the consideration of manufacturing cost, silver-coated copper powder is applied in electrically conductive ink gradually, the open flaky silver coated copper powder of Caihong Group Co's successively application, flaky silver coated copper powder combine as the ink technology of preparing of conductive filler material with flake silver powder, although the patent states the characteristics such as electrically conductive ink is anti-oxidant, low cost, but with regard to electroconductibility, do not list its advantage.

According to statistics, adopt existing conductive ink printing method to prepare the cost of RFID label antenna each piece about 0.5 yuan, the use of silver-colored copper-clad can reduce costs.Be used alone silver-colored copper-clad can decrease in electric conductivity and conduction homogeneity as conductive filler material, and the intervention of proper amount of nano silver powder can make up this defect.Existing electrically conductive ink many employings oleoresin is as binder, and the water-base resin that the present invention adopts, while maintenance ink characteristics, can reduce the fire risk in the discharge of toxic substance and Printing ink producing process.The contrast of the present invention and existing patent:

The several patent publication No. relevant to content of the present invention and patent name as follows:

Publication number: CN101921505A, a kind of radio frequency identification system printing conductive ink composition;

Publication number: CN101967319A, a kind of water-based ink for radio frequency identification antenna and preparation method thereof;

Publication number: CN102120265A, the colloid of monodispersed Nano silver grain, the preparation method of nano-silver powder and electrically conductive ink thereof;

Publication number: CN102702840A, the mixed system of a kind of nanometer gold and nanometer silver prepares the method for electrically conductive ink; Above patent all relates to the preparation method of electrically conductive ink,

Summary of the invention

For solve exist in existing electrically conductive ink high cost, hazardness and conduction homogeneity, stability problem, the present invention, from binder and conductive filler material two angles, provides a kind of preparation scheme preparing safety and environmental protection, high conductivity, high stability ink.

A kind of RFID label antenna low-temperature sintering type water-soluble conducting ink, is characterized in that: its components in mass portion number calculates, composed as follows:

A preparation method for described RFID label antenna low-temperature sintering type water-soluble conducting ink, this preparation method mainly comprises the following steps:

1) preparation of conductive filler material: nano-silver powder is mixed with flaky silver coated copper powder;

2) preparation of resin system: above-mentioned dehydrated alcohol, defoamer, flow agent, thickening material are added in waterborne binder resin waterborne polyurethane resin, is placed in ultrasound environments concussion and makes it be uniformly dispersed;

3) conductive filler material is distributed in resin system, after mechanical stirring is even, compound is ground, until fineness reaches less than 10 μm, namely obtains required electrically conductive ink.

Difference of the present invention is:

1) introduce nano-silver powder in micron order silver powder electrically conductive ink, improve ink performance.

Existing electrically conductive ink or employing micron order silver powder are as conductive filler material, or adopt nano-silver powder as conductive filler material, nano-silver powder combines with micron flakes silver-coated copper powder and uses, the vacancy that may stay between flaky silver coated copper powder can be filled up, make between electrically conductive particles, to be connected more thorough, can improve conduction homogeneity and the stability of ink, and use merely compared with nano-silver powder, adding of silver-coated copper powder can reduce costs.

2) adopt water-base resin as main binder.

Oleoresin, in use with the volatilization of toxic substance, causes huge injury to human body, and the use of water-base resin of the present invention can reduce the volatilization of organic solvent in production process, protection of the environment and staff's health.

3) water-base resin that adopts of the present invention is while maintenance ink characteristics, can reduce the fire risk in the discharge of toxic substance and Printing ink producing process.

4) electrically conductive ink using the inventive method obtained, having can low-temperature sintering, the characteristic such as printability is good, electroconductibility is uniform and stable, resistivity is low.

5) the present invention is by the mode used that flaky silver coated copper powder and nano-silver powder combined, and realizes the effect that ink high conductivity and low-temperature sintering are taken into account.

Effect of the present invention is the electrically conductive ink using the method obtained, and having can low-temperature sintering, the characteristic such as printability is good, electroconductibility is uniform and stable, resistivity is low.The electrically conductive ink using this invention obtained economic benefit,

The aspect such as environmental protection, electroconductibility has excellent characteristic.

Accompanying drawing explanation

Fig. 1 and Fig. 2 is the electrically conductive ink rheological schematic diagram of embodiment 1 and 2

Embodiment

In conjunction with example, the preparation technology to electrically conductive ink of the present invention is illustrated.

Embodiment 1

1. the development of electrically conductive ink

The portion rate of each component of electrically conductive ink is as shown in table 1

Table 1 example 1 electrically conductive ink component percentages content

First flaky silver coated copper powder and nano-silver powder are stirred, tree resin system again---water-borne acrylic resin, ethanol and the auxiliary agent such as defoamer, flow agent are mixed, finally two-phase mixtures is transferred to shredder and grinds, ink fineness is detected in real time with Hegman grind gage, namely stop grinding to less than 10 μm, obtain required electrically conductive ink.

2. the test of ink characteristics

Carry out rheological and sheet resistance test to ink, as shown in Figure 1, can find out that ink has good viscosity and thixotropy, printing effect is good for rheological.Ink sheet resistance value is 0.1 Ω/, meets the printing of RFID label antenna.

Embodiment 2

1. the development of electrically conductive ink

The portion rate of each component of electrically conductive ink is as shown in table 2

Table 2 example 2 electrically conductive ink component percentages content

First flaky silver coated copper powder and nano-silver powder are stirred, tree resin system again---water-borne acrylic resin, a small amount of ethanol and the auxiliary agent such as defoamer, flow agent are mixed, finally two-phase mixtures is transferred to shredder and grinds, ink fineness is detected in real time with Hegman grind gage, namely stop grinding to less than 10 μm, obtain required electrically conductive ink.

2. the test of ink characteristics

Carry out rheological and sheet resistance test to ink, as shown in Figure 2, can find out that ink has good viscosity and thixotropy, printing effect is good for rheological.Ink sheet resistance value is 0.05 Ω/, meets the printing of RFID label antenna.

Conclusion:

Along with the fast development of Internet of Things and RFID technique, the market demand of electrically conductive ink also increases year by year, how can reduce ink cost as much as possible on the basis realizing every basic function, be the problem that we explore always, this also will play the effect of adding fuel to the flames to the development of Internet of Things.The present invention, by the mode used that flaky silver coated copper powder and nano-silver powder combined, realizes the effect that ink high conductivity and low-temperature sintering are taken into account.The content of adjustment ink different components and the kind of component, can also realize the inching to electrically conductive ink viscosity and electric conductivity, be applicable to the printing of different substrate materials.

Claims (2)

1. a RFID label antenna low-temperature sintering type water-soluble conducting ink, is characterized in that: its components in mass portion number meter, composed as follows:

。

2. a preparation method for RFID label antenna low-temperature sintering type water-soluble conducting ink according to claim 1, this preparation method mainly comprises the following steps:

1) preparation of conductive filler material: nano-silver powder is mixed with flaky silver coated copper powder;

2) preparation of resin system: above-mentioned dehydrated alcohol, defoamer, flow agent, thickening material are added in waterborne binder resin waterborne polyurethane resin, is placed in ultrasound environments concussion and makes it be uniformly dispersed;

3) conductive filler material is distributed in resin system, after mechanical stirring is even, compound is ground, until fineness reaches less than 10 μm, namely obtains required electrically conductive ink.