COMPOSITION FOR INSULATING COATING

Abstract

A composition includes flakes of mineral or plant-based wool, a powdered mineral binder and a water-repellent agent.

Claims

1. A composition comprising flakes of mineral or plant-based wool, a powdered mineral binder and a water-repellent agent.

2. The composition according to claim 1, wherein the mineral wool is chosen from glass wools, slag wools and stone wools.

3. The composition according to claim 1, wherein the flakes of mineral or plant-based wool have a size of between 1 and 10 cm.

4. The composition according to claim 1, wherein the powdered mineral binder is a hydraulic binder.

5. The composition according to claim 4, wherein the powdered mineral binder comprises a mixture of Portland cement, a source of calcium sulfate, and optionally aluminate cement.

6. The composition according to claim 1, wherein the water-repellent agent comprises an organosilicon compound.

7. The composition according to claim 1, wherein the water-repellent agent is in powder form.

8. The composition according to claim 6, wherein the water-repellent agent comprises an organosilicon compound and an inorganic or organic solid support, or is a redispersible powder.

9. The composition according to claim 1, further comprising redispersible polymer powders and/or surfactants.

10. The composition according to claim 1, comprising 50 to 90% by weight of mineral or plant-based wool, 10 to 50% by weight of mineral binder and 0.1 to 2% water-repellent agent, relative to a cumulative weight of mineral or plant-based wool and mineral binder.

11. A method for obtaining an insulating coating on or against a support, comprising mixing a composition according to claim 1 with water and depositing the mixture obtained on or against said support.

12. The method according to claim 11, wherein the deposition of the mixture is carried out by spraying, the composition being conveyed to a spray nozzle, and the water being added as soon as possible to the outlet of the nozzle.

13. The method according to claim 11, wherein the support is vertical, the deposition being carried out on the exterior surface of said wall.

14. A building element comprising a support coated on one of its surfaces with an insulating coating comprising flakes of mineral wool or plant-based wool bonded together by a hardened mineral binder, and a water-repellent agent, said insulating coating being obtained by the method of at least claim 11.

15. The building element according to claim 14, wherein the insulating coating has a thickness of between 30 and 300 mm.

16. The composition according to claim 4, wherein the hydraulic binder is selected from the group consisting of Portland cements, belite cements, aluminous cements, sulfoaluminate cements, pozzolan blend cements, fly ash, metakaolins, hydraulic lime and mixtures of two or more of these hydraulic binders.

17. The composition according to claim 6, wherein the organosilicon compound comprises silane and/or siloxane, monomer, dimeric, oligomeric or polymeric groups.

18. The method according to claim 13, wherein the support is vertical is an exterior wall of a building.

Description

COMPARATIVE EXAMPLE

[0066] In this comparative example, the composition comprised 80% by weight of slag wool flakes sold by the Applicant under the name Coatwool, 18% CEM I and 2% hemihydrate cement, further with an addition of 0.59% cellulose ether (tylose) and of 1% mineral oil. The dry matter flow rate was 8 kg/min, the water flow rate was 6 kg/min.

Example 1

[0067] In example 1, the sprayed composition comprised 66.7% glass blowing wool flakes sold by the Applicant under the name Comblissimo, 30% cement CEM I, 3.3% hemihydrate, plus an addition of 0.82% cellulose ether (tylose) and 1% of mineral oil. The blowing wool comprised from 0.1 to 0.4% water-repellent agent (silicone), 1 to 2% mineral oil and 0.2% antistatic agent, these agents being dispersed on the fibers. The dry matter flow rate was 2.5 to 3 kg/min, and the water flow rate was 5 kg/min.

Example 2

[0068] In example 2, the sprayed composition comprised 80% by weight of slag wool flakes (Coatwool), 18% CEM I and 2% hemihydrate cement, also with an addition of 1% water-repellent agent (Silres? d) and 1% mineral oil. The dry matter flow rate was 8 kg/min, and the water flow rate was 5 kg/min.

Example 3

[0069] In example 3, the sprayed composition comprised 66.7% slag wool flakes, 30% CEM I and 3.3% hemihydrate cement, also with an addition of 1.66% water-repellent agent (Silres? d) and 1% mineral oil. The dry matter flow rate was 2.5 kg/min and the water flow rate was 6 kg/min.

[0070] Table 1 below indicates for each example the density (MV) of the coating obtained (in kg/m.sup.3), the thermal conductivity (A) of the coating (in mW/m.Math.K), the water absorption, denoted W, after 1 hour and 24 hours (in kg/m.sup.2) measured according to ISO 29767, the 3-point bending resistance (in kPa), the compressive strength (in kPa) and the tensile strength (in kPa).

TABLE-US-00001 TABLE 1 Comp. 1 2 3 MV (kg/m.sup.3) 190 70 190 150 ? (mW/m .Math. K) 48 37 44 46 W-1 h (kg/m.sup.2) 31 1.6 0.1 0.1 W-24 h (kg/m.sup.2) 3.8 0.1 0.1 Bending (kPa) 52 6 28 35 Compressive (kPa) 78 25 33 54 Tensile (kPa) 7 2 7 14