MULTI-COMPONENT COMPOSITION FOR PRODUCING AN AQUEOUS COATING MASS

Abstract

A composition consisting essentially of (a) 1 to 30 wt. % of a hydrogen phosphate selected from the group consisting of mono and dihydrogen phosphates of sodium, potassium, ammonium, magnesium, calcium, aluminium, zinc, iron, cobalt, and copper; (b) 1 to 40 wt. % of a compound selected from the group consisting of oxides, hydroxides, and oxide hydrates of magnesium, calcium, iron, zinc, and copper; (c) 40 to 95 wt. % of a particulate filler selected from the group consisting of glass; mono-, oligo- and poly-phosphates of magnesium, calcium, barium and aluminium; calcium sulfate; barium sulfate; simple and complex silicates; simple and complex aluminates; simple and complex titanates; simple and complex zirconates; zirconium dioxide; titanium dioxide; aluminium oxide; silicon dioxide; silicon carbide; aluminium nitride; boron nitride and silicon nitride; and (d) 0 to 25 wt. % of a constituent that differs from constituents (a) to (c).

Claims

1. Composition consisting essentially of the following constituents: (a) 1 to 30 wt. % of at least one hydrogen phosphate selected from the group consisting of mono and dihydrogen phosphates of sodium, potassium, ammonium, magnesium, calcium, aluminium, zinc, iron, cobalt, and copper; if applicable, in combination with 1 to 90 wt-% aqueous phosphoric acid; (b) 1 to 40 wt. % of at least one compound selected from the group consisting of oxides, hydroxides, and oxide hydrates of magnesium, calcium, iron, zinc, and copper; (c) 40 to 95 wt. % of at least one particulate filling agent selected from the group consisting of glass; mono-, oligo- and poly-phosphates of magnesium, calcium, barium and aluminium; calcium sulfate; barium sulfate; simple and complex silicates comprising sodium, potassium, calcium, aluminium, magnesium, iron and/or zirconium; simple and complex aluminates comprising sodium, potassium, calcium, magnesium and/or zirconium; simple and complex titanates comprising sodium, potassium, calcium, aluminium, magnesium, barium and/or zirconium; simple and com-plex zirconates comprising sodium, potassium, calcium, aluminium and/or magnesium; zirconi-um dioxide; titanium dioxide; aluminium oxide; silicon dioxide; silicon carbide; aluminium nitride; boron nitride and silicon nitride; and (d) 0 to 25 wt. % of at least one constituent that differs from constituents (a) to (c); whereby constituent (a) can comprise up to 10 wt. % free water, relative to the total of constituent (a); whereby constituent (d) can comprise up to 10 wt. % free water, relative to the total of constituent (d); whereby the composition is present as a two- or multicomponent system, and whereby constituents (a) and (b) are present essentially separate from each other or, if constituent (a) comprises phosphoric acid, are present separate from each other.

2. Composition according to claim 1, whereby constituent (a) is at least one hydrogen phosphate selected from the group consisting of mono- and dihydrogen phosphates of magnesium, potassium, aluminium, and ammonium.

3. Composition according to claim 1, whereby constituent (b) is at least one compound selected from the group consisting of magnesium oxide, iron oxide, and calcium oxide.

4. Composition according to claim 1, whereby constituent (c) is at least one particulate filling agent selected from the group consisting of zirconium silicate, silicic acid, and quartz.

5. Composition according to claim 1, whereby the components of the two- or multicomponent system are present in a provided amount that corresponds to the quantitative ratios of constituents (a) to (d).

6. Aqueous hydraulically curable preparation that can be produced by mixing the components of a composition according to claim 1 with each other and with water.

7. Aqueous hydraulically curable preparation according to claim 6, whereby the mixing ratio is 100 parts by weight of the composition and 5 to 30 parts by weight of water.

8. Method for the production of an aqueous hydraulically curable preparation according to claim 6 by mixing the components of a composition with each other and with water, the composition consisting essentially of the following constituents: (a) 1 to 30 wt. % of at least one hydrogen phosphate selected from the group consisting of mono and dihydrogen phosphates of sodium, potassium, ammonium, magnesium, calcium, aluminium, zinc, iron, cobalt, and copper; if applicable, in combination with 1 to 90 wt-% aqueous phosphoric acid; (b) 1 to 40 wt. % of at least one compound selected from the group consisting of oxides, hydroxides, and oxide hydrates of magnesium, calcium, iron, zinc, and copper; (c) 40 to 95 wt. % of at least one particulate filling agent selected from the group consisting of glass; mono-, oligo- and poly-phosphates of magnesium, calcium, barium and aluminium; calcium sulfate; barium sulfate; simple and complex silicates comprising sodium, potassium, calcium, aluminium, magnesium, iron and/or zirconium; simple and complex aluminates comprising sodium, potassium, calcium, magnesium and/or zirconium; simple and complex titanates comprising sodium, potassium, calcium, aluminium, magnesium, barium and/or zirconium; simple and com-plex zirconates comprising sodium, potassium, calcium, aluminium and/or magnesium; zirconi-um dioxide; titanium dioxide; aluminium oxide; silicon dioxide; silicon carbide; aluminium nitride; boron nitride and silicon nitride; and (d) 0 to 25 wt. % of at least one constituent that differs from constituents (a) to (c); whereby constituent (a) can comprise up to 10 wt. % free water, relative to the total of constituent (a); whereby constituent (d) can comprise up to 10 wt. % free water, relative to the total of constituent (d); whereby the composition is present as a two- or multicomponent system, and whereby constituents (a) and (b) are present essentially separate from each other or, if constituent (a) comprises phosphoric acid, are present separate from each other.

9. Method according to claim 8, whereby, initially all components of the two- or multicomponent system are mixed without adding water and subsequently are mixed with water to produce the aqueous hydraulically curable preparation.

10. Method according to claim 8, whereby at least one of the components of the two- or multicomponent system is first mixed with water to produce at least one aqueous intermediate, before this is mixed further with the further component(s) and/or the further aqueous intermediate(s).

11. Method for the production of a hydraulically cured enclosure of an electronic component, comprising the steps of (1) providing an electronic component to be enclosed; (2) providing an aqueous enclosing mass in the form of an aqueous hydraulically curable preparation according to claim 6; (3) enclosing the electronic component provided in step (1) in the aqueous enclosing mass pro-vided in step (2); and (4) hydraulic curing of the aqueous enclosing mass enclosing the electronic component after completion of step (3).

12. Method according to claim 11, whereby the electronic component to be enclosed is a passive electronic component or a semiconductor module.

13. Method according to claim 11 implemented on an industrial scale.

14. Method according to claim 13, whereby step (2) comprises the following sub-steps: (2a) Providing a two-component composition from a first component A comprising constituent (a) and a second component B comprising constituent (b); (2b) separately mixing each of the components A and B with water to produce two separate aqueous intermediates A and B; and (2c) mixing aqueous intermediates A and B by means of a static mixer to produce an aqueous enclosing mass in the form of the aqueous hydraulically curable preparation. wherein constituent (a) is at least one hydrogen phosphate selected from the group consisting of mono and dihydrogen phosphates of sodium, potassium, ammonium, magnesium, calcium, aluminium, zinc, iron, cobalt, and copper; if applicable, in combination with 1 to 90 wt-% aqueous phosphoric acid, and wherein constituent (b) is at least one compound selected from the group consisting of oxides, hydroxides, and oxide hydrates of magnesium, calcium, iron, zinc, and copper.

15. Method according to claim 14, whereby the two aqueous intermediates A and B have volumes that differ by no more than 20% from each other and/or each have a viscosity in the range of 0.5 to 50 Pa.Math.s (rotation viscosimetry, plate-plate measuring principle, plate diameter 25 mm, measuring gap 1 mm, sample temperature 20 C., shear rate 36 min-1, viscosity values determined after a measuring time of 2 minutes).

16. Method for the production of a hydraulically cured enclosure of an electronic component, comprising the steps of (1) providing an electronic component to be enclosed; (2) providing an aqueous enclosing mass in the form of an aqueous hydraulically curable preparation produced according to a method according to claim 8; (3) enclosing the electronic component provided in step (1) in the aqueous enclosing mass pro-vided in step (2); and (4) hydraulic curing of the aqueous enclosing mass enclosing the electronic component after completion of step (3).

Description

EXAMPLES

[0079] General Procedure:

[0080] Each component of the powdered solids compositions described in the table below were weighed in a beaker with a screw-on lid. The beaker was closed and then each component was homogenised individually by manual shaking and then added to water that had been placed into to another beaker and this was homogenised for 5 minutes by intensive stirring to produce an aqueous intermediate. The mixing ratio for each aqueous intermediate was 100 parts by weight of the solids composition: 10 parts by weight of water. The aqueous intermediates thus obtained were placed into the measuring cell of a rheometer and the respective initial viscosity was determined in accordance with the information provided in the description above. Subsequently, both aqueous intermediates were combined at the specified mass ratio and were homogenised by intensive stirring to produce an aqueous enclosing mass. This was placed into the measuring cell of a rheometer and the pot life was determined in accordance with the information provided in the description above.

TABLE-US-00002 Example 1 Example 2 Constituent Component A Component B Component A Component B (A) Potassium dihydrogen 3.84 0 3.84 0 phosphate (b) Magnesium oxide D.sub.50 = 0 4.6 0 4.6 18 m (c) Zirconium silicate D.sub.50 = 19.4 17.92 21.3 16 10 m (d1) Urea 2.4 3.6 2.4 3.6 (d2) L-Tartaric acid 0.36 2.04 0.36 2.04 (d3) Trisodium citrate 0.36 2.04 0.36 2.04 trihydrate Relative mass fraction of 1 1.13 1 1 the aqueous intermediate Initial viscosity of the 2 4 2 2.5 aqueous intermediate [Pa .Math. s] Storage time of 50 h 50 h component B Pot life of the 50 min 50 min enclosing mass D.sub.50 = mean particle diameter