Multi-component composition for producing an aqueous coating mass

Abstract

A composition is provided. The composition consists 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 aluminum; calcium sulfate; barium sulfate; simple and complex silicates; simple and complex aluminates; simple and complex titanates; simple and complex zirconates; zirconium dioxide; titanium dioxide; aluminum oxide; silicon dioxide; silicon carbide; aluminum nitride; boron nitride and silicon nitride; and (d) 0 to 25 wt. % of a constituent that differs from constituents (a) to (c).

Claims

1. A method for the production of a hydraulically cured enclosure of an electronic component, the method comprising the steps of: (i) providing an electronic component to be enclosed; (ii) providing an aqueous enclosing mass in the form of an aqueous hydraulically curable preparation produced according to a method comprising the steps of: mixing at least one component of a composition with water to produce at least one aqueous intermediate, and mixing the at least one aqueous intermediate with further component(s) of the composition and/or further aqueous intermediate(s), wherein the composition consists 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 magnesium, calcium, aluminum, zinc, iron, cobalt, and copper; (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 aluminum; calcium sulfate; barium sulfate; simple and complex silicates comprising sodium, potassium, calcium, aluminum, 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, aluminum, magnesium, barium and/or zirconium; simple and complex zirconates comprising sodium, potassium, calcium, aluminum and/or magnesium; zirconium dioxide; titanium dioxide; aluminum oxide; silicon dioxide; silicon carbide; aluminum nitride; boron nitride and silicon nitride; and (d) 0 to 25 wt. % of at least one constituent that differs from constituents (a) to (c), wherein constituents (a), (b) and (c) comprise no free water, wherein constituent (d) comprises no water, wherein the composition is present as a two-component system, and wherein constituents (a) and (b) are present separate from each other before the mixing steps; (iii) enclosing the electronic component provided in step (i) in the aqueous enclosing mass provided in step (ii); and (iv) hydraulic curing the aqueous enclosing mass enclosing the electronic component after completion of step (iii).

2. The method according to claim 1, wherein the electronic component to be enclosed is a passive electronic component or a semiconductor module.

3. The method according to claim 1, wherein the method is implemented on an industrial scale.

4. The method according to claim 1, wherein step (ii) comprises the following sub-steps: (iia) providing the composition from a first component A comprising the constituent (a) and a second component B comprising the constituent (b); (iib) mixing component A with water to produce a first aqueous intermediate A′ and separately mixing component B with water to produce a second aqueous intermediate B′; and (iic) mixing the first and second aqueous intermediates A′ and B′ using a static mixer to produce the aqueous enclosing mass in the form of the aqueous hydraulically curable preparation.

5. The method according to claim 4, wherein the first and second 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.sup.−1, viscosity values determined after a measuring time of 2 minutes).

6. The method according to claim 1, wherein constituent (a) is at least one hydrogen phosphate selected from the group consisting of mono and dihydrogen phosphates of magnesium and aluminum.

7. The method according to claim 1, wherein constituent (b) is at least one compound selected from the group consisting of magnesium oxide, iron oxide, and calcium oxide.

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

9. The method according to claim 1, wherein the components of the two-component system are present in an amount that corresponds to the quantitative ratios of constituents (a) to (d).

Description

EXAMPLES

(1) General Procedure:

(2) 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 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.

(3) TABLE-US-00002 Example 1 Example 2 Compo- Compo- Compo- Compo- Constituent nent A nent B nent A nent B (A) Potassium 3.84 0 3.84 0 dihydrogen phosphate (b) Magnesium oxide 0 4.6 0 4.6 D.sub.50 = 18 μm (c) Zirconium silicate 19.4 17.92 21.3 16 D.sub.50 = 10 μm (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