Paste for coating on substrates and method of reception

 

(57) Abstract:

Describes paste for coating on substrates, comprising at least one powder substance, at least one diluted with water nonionic rheological substance and water, characterized in that, as a powder substance it contains powdered substance selected from the group comprising niobium, tantalum, molybdenum, tungsten, Nickel, chromium, boron, indium, tin, oxides, silicides and alloys and silicon dioxide, as well as with water-dilutable nonionic rheological substance is a substance selected from the group comprising an associative thickener based on polyurethane, the aqueous dispersion of silicic acid and simple polyglycolic aired the next time quantitative ratio of components, wt.%: specified powder substance - 32-90,6; specified nonionic rheological substance is 0.3 to 12.5; water - the rest. The technical result - the simplification of the process and its cost reduction while maintaining the quality characteristics of the well-known pasta. 2 S. and 3 C.p. f-crystals.

The invention relates to compositions for coating on substrates, in particular to the paste for coating on substrates and to the way it PVA, such as, for example, powdered molybdenum, organic binder, organic solvent and additives target (see patent DE No. 25 58 361 C2, MKI: H 05 K 3/36, 1982).

Famous pasta is prepared by simple mixing of the ingredients.

A disadvantage of the known pastes is that due to the presence of organic binder and solvent, it is environmentally hazardous, flammable, partially toxic waste pollutes the water and has an intense smell. So when using it you should take appropriate measures for the protection of labour, and to provide equipment to prevent issues.

The closest to the invention to the technical essence and the achieved effect is a paste for coating on substrates containing at least one powder substance selected from the group comprising copper, aluminum, silver, brass and graphite, water-soluble resin or aqueous emulsion resins, lithium silicate as film-forming substances, nonionic rheological substance selected from the group comprising alkylbenzenesulfonate and polyoxyethyleneglycol, and water (see JP 74 00 7330 B, C 07 D H 01 B, 1974).

Famous pasta privates, it includes five required components.

The objective of the invention is to develop a paste for coating on substrates, which can simplify the manufacturing technology and reduce the cost while maintaining the quality characteristics of the well-known pasta.

The problem is solved by the proposed paste for coating substrates, comprising at least one powder substance, at least one diluted with water nonionic rheological substance and water, due to the fact that, as a powder substance it contains powdered substance selected from the group comprising niobium, tantalum, molybdenum, tungsten, Nickel, chromium, boron, indium, tin, oxides, silicides and alloys and silicon dioxide, as well as with water-dilutable nonionic rheological substance is a substance selected from the group comprising an associative thickener based on polyurethane, the aqueous dispersion of silicic acid and simple polyglycolic ether, the next time quantitative ratio of components, wt.%:

Specified powder substance - 32 - 90,6

Specified nonionic rheological substance - 0,3 is 12.5

Water - the Rest

As associateparticularlathes and/or hexamethylenediisocyanate.

We offer pasta may contain standard wetting agent in the amount of 0.3 -11,0 wt.%.

The offered paste is prepared by dispersing in water at least one of the above powdered substances and at least one of the above diluted with water nonionic rheological substances.

While it may be appropriate to additionally influence on the rheological properties of the paste by the addition of wetting agent. The above polyurethane thickener may already contain a suitable lubricant. The proposed method can be conducted in an atmosphere of inert gas.

Contained in the paste ingredients expediently chosen so that the dry weight of the paste after heat treatment up to 550oC no longer contains organic substances.

We offer pasta well suited for the deposition of coatings on inorganic substrates, such as glass, ceramics, glass, enamel and metals, and organic substrates, such as plastics. While the coating on the substrate is preferably carried out by printing, especially preferably by screen printing, and/or casting and/or immersion, and/or naraschivanie coatings can be done preferably by the technique of printing or lithography, and UV-lithography. You can use any technique of printing. Particularly suitable offer pasta for metallization of substrates.

The following examples illustrate the invention.

Example 1. To obtain a molybdenum paste 70 wt.% the molybdenum metal powder with an average particle size of about 2 μm, 5 wt.% associative thickener, Borgiel L (trademark of Gebr. Borchers AG, Goslar, DE), representing a 44% aqueous emulsion of hexamethylenediisocyanate, 8 wt.% Borjigin DFN (trademark of Gebr. Borchers AG, Goslar, DE), representing polyglycolic ether, and 3 wt.% of wetting Borjigin ND (trademark of Gebr. Borchers AG, Goslar, DE), which is an amine salt of ester of phosphoric acid is dispersed in water, taken up to 100 wt.%. Thus obtained paste is suitable for the manufacture of conductive strips in a ceramic mnogodenek modules based on aluminum oxide and thus allows, in particular, and to fill the contact between the individual layers in a single operation printing.

Example 2. 75 wt.% metal powder tungsten with an average particle size of 1.4 µm and 12.5 weight. % associative segust SIU toluylene diisocyanate, dispersed in water, taken up to 100 wt.%. Thus obtained paste suitable for metallization of substrates.

Example 3. Analogously to example 1 to obtain a dispersion of 60 wt.% disilicide molybdenum with an average particle size of 10 μm and 11 wt.% Borjigin DFN in water, taken in an amount up to 100%. The rheological characteristics of the paste is adjusted by adding 5% by weight aqueous dispersion of silicic acid. Thus obtained paste suitable for application of the heating products ceramic substrates, such as silicon nitride.

Example 4. Similarly to the above examples get the variance 65 weight. % niobium oxide with an average particle size of 2 μm, 5 wt.% Borgiel LV, and 11 wt.% Borjigin ND in water, taken up to 100 wt.%. Get pasta, suitable for dielectric coatings.

Example 5. 75 wt.% powder alloy of Nickel, chromium and boron, with an average particle size of 15 μm, 8 wt.% Borgian DFN, and 3 wt.% Borjigin ND is dispersed through a roller mill in water, taken up to 100 wt.%. Get a suitable paste for metallization of substrates.

Example 6. 81,6% wt. powder of silver with an average particle size of the APCS, suitable for applying conductive coatings, for example, metallization edges of ceramic capacitors, or for applying strips of resistance on the glass.

Example 7. 72,3% wt. powder of Nickel with an average particle size of < 3 mm and having a spherical configuration, and 8.9 wt.% Borjigin DFN is dispersed in the atmosphere of argon in water made up to 100 wt.%. Thus obtained Nickel paste suitable for the production of conductive coatings, for example, the internal conductive strips of ceramic capacitors.

Example 8. 90,6% wt. suitable for use in capacitors tantalum powder, 0.3 wt.% Borjigin DFN and 0.3 wt.% Borjigin ND dispersed through mesites in water, taken up to 100 wt.%. Thus obtained paste is suitable for the manufacture of anodes for electronicsalready capacitors.

Example 9. 48 weight. % powder of indium and tin oxide with an average particle size of < 800 nm and 8 wt.% Borjigin DFN (trademark firm Gebr. Borchers AG, Goslar, DE) was dispersed by a dispersing apparatus in the water, taken up to 100 wt.%. Thus obtained paste is suitable for the deposition of conductive, transparent structures on the glass.

Example 11. 50 wt.% silicon dioxide with an average particle size of 50-100 nm and 4 weight. % Briges LV 44 (trademark firm Gebr. Borchers AG, Goslar, DE) was dispersed in water, taken in an amount up to 100% by weight. Thus obtained paste is suitable for coating on the glass to reduce reflections.

The examples of the paste is applied by screen printing on the respective substrates and dried at temperatures up to 550oC. Drying containing oxides of pastes perform on the air. Metal containing paste is dried in an atmosphere of protective gas or in a vacuum. In all cases contained organic additives are removed completely. Additional cleaning is not required. Then increase the temperature so that the solid specal until then, until it has reached the desired properties.

1. Paste for coating on substrates, comprising at least one powder substance, at least one diluted with water non-ionic resisto, selected from the group including niobium, tantalum, molybdenum, tungsten, Nickel, chromium, boron, indium, tin, oxides, silicides and alloys and silicon dioxide, as well as with water-dilutable nonionic rheological substance is a substance selected from the group comprising an associative thickener based on polyurethane aqueous dispersion of silicic acid and simple polyglycolic aired the next time quantitative ratio of components, wt.%:

Specified powder substance - 32 - 90,6

Specified nonionic rheological substance - 0,3 - 12,5

Water - the Rest

2. Pasta under item 1, characterized in that it as an associative thickener based on polyurethane contains a thickener based toluylenediisocyanate and/or hexamethylenediisocyanate.

3. Pasta PP.1 and 2, characterized in that it additionally contains a wetting agent in quantities of from 0.3 to 11.0 wt.%.

4. A method of obtaining a paste for coating substrates by mixing at least one powder substance with water and at least one diluted with water nonionic rheological substance, characterized in that, as a powder substance use powder substance, selected and alloys and silicon dioxide, and as with water-dilutable nonionic rheological substance is a substance selected from the group comprising an associative thickener based on polyurethane aqueous dispersion of silicic acid and simple polyglycolic ether.

5. The method according to p. 4, characterized in that the process is carried out in an atmosphere of inert gas.

 

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3 cl, 4 ex, 2 tbl

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