Silver paste for acid-resistant atomizer and preparation method thereof

Abstract

The invention provides silver paste for an acid-resistant atomizer and a preparation method of the silver paste, the silver paste for the acid-resistant atomizer comprises resin, a solvent, glass powder and silver powder, the glass powder is Zn-B-Si glass powder, and the silver powder is submicron silver powder and nanoscale silver powder of 0.2-0.6 mu m. The invention aims to improve the acid resistance of the silver paste so as to be suitable for the acid-resistant atomizer.

Description

Technical Field

[0001] The invention relates to the technical field of silver paste preparation, and in particular to silver paste for an acid-resistant atomizer and a preparation method thereof. Background Art

[0002] Acid-resistant atomizer silver paste requires that the silver layer does not fall off after being immersed in 10% hydrochloric acid solution for 12 hours. Currently, the same type of silver paste in China can only be used to make conventional non-acid-resistant atomizers. Acid-resistant atomizer silver paste is still dominated by imported silver paste in the market.

[0003] Acid-resistant atomizer silver paste requires a bright silver layer, good adhesion, and resistance to acid salt immersion. Acid-resistant atomizer silver paste can well match various extreme environment tests of atomizer components and has good stability.

[0004] The existing technology mainly achieves the acid-resistant effect by selecting appropriate acid-resistant glass powder and adjusting the relevant parameters of the glass powder. However, the acid-resistant glass powder currently manufactured in China still cannot achieve good results in terms of acid-resistant time and adaptability to acid solutions of different degrees. At the same time, the brightness of the silver layer will be sacrificed to a certain extent by adding acid-resistant glass content, resulting in certain differences in performance. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a silver paste for an acid-resistant atomizer, aiming to improve the acid resistance of the silver paste so as to be suitable for an acid-resistant atomizer.

[0006] The invention provides a silver paste for an acid-resistant atomizer. The components include resin, solvent, glass powder and silver powder. The glass powder is Zn-B-Si glass powder, and the silver powder is submicron silver powder and nanometer silver powder of 0.2-0.6 mu m.

[0007] (1) The present invention uses suitable nano-scale silver powder to improve the density of the silver layer after sintering by adjusting the degree of sintering, and enhances the ability to isolate the corrosion of foreign chemical substances, thereby achieving the effect of acid resistance. Specifically, the use of nano-scale silver powder doped between submicron silver powders can make the silver layer denser and brighter.

[0008] (2) The sintering temperature of atomizer silver paste is generally 780-820℃. Nano-scale silver powder with smaller particle size and larger specific surface area can effectively reduce the sintering temperature, so that the silver paste can be better sintered at a temperature of 780-820℃, thereby achieving the effect of increasing the density of the silver layer to ensure that the silver paste meets the high acid resistance requirements in the atomizer field.

[0009] (3) The use of Zn-B-Si glass powder can improve high temperature stability, corrosion resistance and photochemical properties, and further enhance the acid resistance of silver paste.

[0010] In one embodiment, the addition ratio of the glass powder to the silver powder is 1:(5-15). Excessive glass powder affects the performance of the silver paste, while too little glass powder leads to poor viscosity. The addition ratio of glass powder to silver powder is preferably 1:10.

[0011] In one embodiment, the addition ratio of the submicron silver powder to the nanometer silver powder is 1:(5-12).

[0012] In one embodiment, it also includes a preparation aid for improving the processing performance of the silver paste and a sintering aid for improving the sintering performance of the silver paste.

[0013] Specifically, the addition of preparation aids can change the rheological properties of the silver paste, making it easier to operate during processing and improving production efficiency. The sintering aid directly affects the density of the silver layer after sintering. By adding the sintering aid, the holes in the silver layer can be better filled.

[0014] In one embodiment, the preparation aid comprises a surfactant and / or a thixotropic agent.

[0015] Specifically, the surfactant may be lecithin or castor oil or a mixture of the two; and the thixotropic agent may be polyamide wax.

[0016] In one embodiment, the sintering aid includes at least one of cuprous oxide, bismuth oxide and zirconium oxide.

[0017] In one embodiment, the components are calculated by weight as follows: 5-10 parts of the glass powder; 50-60 parts of the submicron silver powder; 5-10 parts of the nano silver powder; 1-8 parts of the resin; 12-29 parts of the solvent; 0.5-3.5 parts of the preparation aid; and 2-5 parts of the sintering aid.

[0018] In one embodiment, the resin includes at least one of cellulose resin, acrylic resin, rosin resin and polyester resin.

[0019] In one embodiment, the solvent includes at least one of oleyl alcohol, diethylene glycol monobutyl ether, tributyl citrate and diethylene glycol monobutyl ether acetate.

[0020] The present invention also provides a method for preparing the silver paste for the acid-resistant atomizer as described above, the steps comprising: mixing the resin and the solvent at 60-80° C. to obtain an organic carrier; mixing the organic carrier and the remaining components evenly and grinding them to a fineness of less than 8 μm to obtain the silver paste for the acid-resistant atomizer. Implementation

[0021] The specific embodiments of the present invention are described in detail below. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the description of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] The terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of the elements listed and may also include additional elements not expressly listed.

[0023] It is worth mentioning that the present invention only lists a number of representative specific implementations, which is intended to reflect the beneficial effects of the present invention, and is not equivalent to the implementations shown below being all implementations of the present invention. Example 1

[0024] The invention provides a silver paste, which comprises 6 parts of resin, 25 parts of solvent, 7 parts of Zn-B-Si glass powder, silver powder, 2 parts of preparation aids and 3 parts of sintering aids; the silver powder is 60 parts of 0.2-0.6 mu m submicron silver powder and 7 parts of nanometer silver powder; the preparation aid is a surfactant and a thixotropic agent; the sintering aid is cuprous oxide; the resin is a mixture of cellulose resin, acrylic resin, rosin resin and polyester resin; and the solvent is oleyl alcohol. Example 2

[0025] The present invention provides a silver paste, which is different from Example 1 in that components include 1 part of resin, 12 parts of solvent, 10 parts of Zn-B-Si glass powder, silver powder, 0.5 parts of preparation aid and 5 parts of sintering aid; the silver powder is 55 parts of 0.2-0.6 μm submicron silver powder and 10 parts of nanometer silver powder; the preparation aid is a surfactant and a thixotropic agent; the sintering aid is cuprous oxide; the resin is a mixture of acrylic resin and polyester resin; and the solvent is diethylene glycol monobutyl ether. Example 3

[0026] The present invention provides a silver paste, which is different from Example 1 in that the components include 8 parts of resin, 29 parts of solvent, 5 parts of Zn-B-Si glass powder, silver powder, 3.5 parts of preparation aids and 2 parts of sintering aids; the silver powder is 50 parts of 0.2-0.6 μm submicron silver powder and 5 parts of nanometer silver powder; the preparation aid is a surfactant and a thixotropic agent; the sintering aid is cuprous oxide; the resin is a mixture of cellulose resin, acrylic resin, rosin resin and polyester resin; and the solvent is oleyl alcohol.

[0027] Comparative Example 1 The present invention provides a silver paste, which is different from Example 1 in that the components include 6 parts of resin, 25 parts of solvent, 7 parts of silica glass powder, silver powder, 2 parts of preparation aids and 3 parts of sintering aids; the silver powder is 67 parts of silver powder with a particle size of 0.2-0.6 μm; the preparation aid is a surfactant and a thixotropic agent; the sintering aid is cuprous oxide; the resin is a mixture of acrylic resin and rosin resin; and the solvent is tributyl citrate.

[0028] Test Results The products of Examples 1-5 were subjected to adhesion tests at 0 h, 6 h, 12 h and 24 h under 2% hydrochloric acid mist. The results of the acid corrosion resistance tests are as follows: The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A silver paste for acid-resistant atomizer, It is characterized in that The components include resin, solvent, glass powder and silver powder. The glass powder is Zn-B-Si glass powder, and the silver powder is 0.2-0.6 micron submicron silver powder and nanometer silver powder.

2. The acid-resistant silver paste for atomizer according to claim 1, It is characterized in that The addition ratio of the glass powder to the silver powder is 1:(5-15).

3. The acid-resistant silver paste for atomizer according to claim 1, It is characterized in that The addition ratio of the submicron silver powder to the nanometer silver powder is 1:(5-12).

4. The acid-resistant silver paste for atomizer according to claim 1, It is characterized in that It also includes a preparation aid for improving the processing performance of silver paste and a sintering aid for improving the sintering performance of silver paste.

5. The acid-resistant silver paste for atomizer according to claim 4, It is characterized in that The preparation aids include surfactants and / or thixotropic agents.

6. The acid-resistant silver paste for atomizer according to claim 4, It is characterized in that The sintering aid includes at least one of cuprous oxide, bismuth oxide and zirconium oxide.

7. The acid-resistant silver paste for atomizer according to claim 4, It is characterized in that The components are calculated in parts by weight: 5-10 parts of the glass powder; 50-60 parts of the submicron silver powder; 5-10 parts of the nano silver powder; 1-8 parts of the resin; 12-29 parts of the solvent; 0.5-3.5 parts of the preparation aid; The sintering aid is 2-5 parts.

8. The acid-resistant silver paste for atomizer according to claim 1, It is characterized in that The resin includes at least one of a cellulose resin, an acrylic resin, a rosin resin, and a polyester resin.

9. The acid-resistant silver paste for atomizer according to claim 1, It is characterized in that The solvent includes at least one of oleyl alcohol, diethylene glycol monobutyl ether, tributyl citrate and diethylene glycol butyl ether acetate.

10. A method for preparing the silver paste for acid-resistant atomizer according to any one of claims 1 to 9, It is characterized in that the steps include: Mixing the resin and the solvent at 60-80° C. to prepare an organic carrier; The organic carrier is uniformly mixed with the remaining components and ground to a fineness of less than 8 μm to obtain the silver paste for the acid-resistant atomizer.

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