Wall and ceiling coating composition having heat insulation properties

Abstract

A coating composition of: from 4 to 17 wt % of hollow microspheres having a thermal conductivity (designated lambda) below 0.1 W.Math.m.sup.1.Math.K.sup.1, from 0.05 to 1 wt % of at least one linear alcohol whose hydrocarbon chain comprises at least 8 carbon atoms, from 5 to 25 wt % of at least one bonding agent selected from water-dispersible or water-soluble polymers, comprising a glass transition temperature (Tg) less than or equal to 65 C., from 25 to 50 wt % of a non-hydraulic binder that is mineral and metallic fillers: having an average particle size in the range from 5 to 100 m, from 0.1 to 1 wt % of at least one thickener, water, Use thereof and the applications thereof as smoothing and/or heat-insulating coating for walls and ceilings.

Claims

1. A coating composition comprising: from 4 to 17 wt % of hollow microspheres having a thermal conductivity (designated lambda) below 0.1 W.Math.m.sup.1.Math.K.sup.1, from 0.05 to 1 wt % of at least one linear alcohol whose hydrocarbon chain comprises at least 8 carbon atoms, from 5 to 25 wt % of at least one bonding agent that is a water-dispersible or water-soluble polymer having a glass transition temperature (Tg) less than or equal to 65 C., from 25 to 50 wt % of a non-hydraulic binder that is a mineral or metallic filler which is a carbonate of an alkaline-earth metal, alumina, silica, a silicate of aluminium, a silicate of an alkali metal, a silicate of an alkaline-earth metal, or a mixture thereof, said fillers having an average particle size of 5 to 100 m, from 0.1 to 1 wt % of at least one thickener, and water, the percentages by weight being expressed in wt % of dry matter relative to the total weight of the coating composition.

2. The coating composition according to claim 1, wherein the hollow microspheres have a real density of 0.05 to 0.5 g/cm.sup.3.

3. The coating composition according to claim 1, wherein the hollow microspheres are hollow microspheres having an average particle size (D50) of 0.10 to 100 m.

4. The coating composition according to claim 1, wherein the hollow microspheres are hollow glass or polymer microspheres of sodium or calcium borosilicate, of aluminosilicate, or of vinylidene chloride/acrylonitrile.

5. The coating composition according to claim 1, wherein the alcohol is a mixture of linear fatty alcohol(s) of formula ROH, where R is a linear hydrocarbon chain, saturated or unsaturated, having from 8 to 30 carbon atoms and of vinyl polyol(s), having a Tg of 75 to 95 C.

6. The coating composition according to claim 1, wherein the water-dispersible or water-soluble polymer is a copolymer of styrene and (meth)acrylic acid, a copolymer of styrene and ester of (meth)acrylic acid, a copolymer of styrene and (meth)acrylamide, said copolymers optionally being silanized, a homopolymer or copolymer of butadiene, a vinyl polymer a polyurethane, or a mixture thereof.

7. The coating composition according to claim 1, wherein the mineral filler is calcium carbonate or silica.

8. The coating composition according to claim 1, wherein the thickener is clay, a polysaccharide thickener or mixture thereof, optionally in the presence of soda.

9. A method of applying a composition as defined in claim 1, comprising at least the following: (i) applying said composition in one or more successive layers on a surface of a substrate using a roller and/or a smoothing tool, then (ii) drying said layer, then (iii) optionally applying, on said hardened coating layer a layer of a non-insulating material.

10. The method according to claim 9, comprising at least the following: (i) applying a first layer of a composition on a surface of a substrate using a roller, then (ii) applying of a second layer of a composition on said first layer deposited using a smoothing tool, the time that passes between the first and second application of the composition being less than 30 minutes, or (ii) smoothing of the surface using a smoothing tool without adding additional material, then (iii) drying the coating composition, then (iv) optionally applying, on said hardened coating layer, a layer of a non-insulating material.

11. The method according to claim 9, comprising at least the following: (i) applying a layer of a composition on a surface of a substrate, using a smoothing tool, then (ii) drying the coating composition, then (iii) optionally applying, on said hardened coating layer, of a layer of a non-insulating material.

12. The method according to claim 9, wherein the roller used in (i) is a honeycomb textured foam roller.

13. A substrate covered with a hardened layer of coating composition of thickness in the range from 0.5 to 3 millimeters obtainable by the method as defined in claim 9.

14. A process for smoothing and/or heat-insulating interior walls and ceilings, comprising achieving heat insulation or smoothing on said wall or ceiling by applying a composition according to claim 1.

15. The coating composition according to claim 6, wherein the copolymer of butadiene is polybutadiene or polybutadiene styrene and the vinyl polymer is polyvinyl chloride or polyvinyl acetate.

16. The method according to claim 10, wherein the roller used in (i) is a honeycomb textured foam roller.

17. A substrate covered with a hardened layer of coating composition of thickness in the range from 0.5 to 3 millimeters obtained by the method as defined in claim 9.

18. An interior wall or ceiling coated with a composition according to claim 1.

Description

EXAMPLES OF THE INVENTION

(1) Coating compositions 1 to 5 according to the invention are produced by mixing the various ingredients shown in Table 1. Unless stated otherwise, the contents indicated in this table are expressed in wt % of dry ingredients relative to the total weight of the composition.

(2) TABLE-US-00001 TABLE 1 Compositions 1 2 3 4 5 a) Hollow glass microspheres 14.3 (Scotchlite S22, 0.076 W .Math. m.sup.1 .Math. K.sup.1) Hollow glass microspheres 15 7.5 10.0 12.0 (Scotchlite K1, 0.047 W .Math. m.sup.1 .Math. K.sup.1) b) C.sub.8-C.sub.30 linear fatty alcohol 0.1 0.1 0.1 0.1 0.1 (Loxanol842 DP/3) Polyvinyl alcohol 0.4 0.4 0.4 0.4 0.4 (Solvitose17S) c) Styrene-butyl acrylate 14.7 12.7 12.7 12.7 12.3 copolymer, Tg = 10 C. d) Calcium carbonate 34.7 36.4 43.9 41.4 29.1 (Beatite30) e) Clay thickener 0.2 0.3 0.3 0.3 0.3 (BentoneEW) Polysaccharide thickener 0.3 0.3 0.3 0.3 0.3 (Addilose 200R) Soda lye q.s. pH > 7 q.s. pH > 7 q.s. pH > 7 q.s. pH > 7 q.s. pH > 7 Additives 0.9* 0.9* 0.9* 0.9* 0.9* f) Water q.s. 100 q.s. 100 q.s. 100 q.s. 100 q.s. 100 q.s. signifies sufficient amount for *amount expressed in wt % wet relative to the total weight of the composition

(3) These compositions may be stored for up to 18 months in the dry, in an air-tight and moisture-proof sealed container.

(4) These compositions were applied easily and uniformly on various substrates (walls, ceilings) by roller and then with a smoothing tool, in a layer with a thickness varying from 0.5 to 3 mm. Once hardened, the covering layer has a smooth, defect-free surface.

(5) Measurement of Thermal Conductivity

(6) For each of examples 1 to 5, the thermal conductivity of the composition once dried is measured for a given thickness, at 23 C. at relative humidity of 50%. Measurement is performed using a measuring probe connected to a NEOTIM FP2C thermal conductivity meter. For this, the test composition is applied in two moulds of parallelepipedal shape made of Teflon with given length, width and thickness, so as to form test specimens 50 mm long, 70 mm wide and of thickness as shown in Table 2. After complete drying of the test specimen, and mould release, the measuring probe is then placed between the 2 test specimens of the composition. Then the two plates of the composition are pressed lightly against one another so that the measuring probe is sandwiched between these two plates.

(7) The results of the measurements of thermal conductivity are expressed in watt per metre per kelvin and are presented in Table 2.

(8) TABLE-US-00002 TABLE 2 Characterization 1 2 3 4 5 Thickness (mm) 0.9 2.1 1.3 1.9 1.9 Thermal conductivity 0.066 0.050 0.068 0.058 0.049 (W/(m .Math. K))

(9) All the samples tested according to the invention have a thermal conductivity below 0.07 W.Math.m.sup.1K.sup.1.

(10) Without further elaboration, it is believed that one skilled in the art can, using the preceding description, utilize the present invention to its fullest extent. The preceding preferred specific embodiments are, therefore, to be construed as merely illustrative, and not limitative of the remainder of the disclosure in any way whatsoever.

(11) The preceding examples can be repeated with similar success by substituting the generically or specifically described reactants and/or operating conditions of this invention for those used in the preceding examples.

(12) From the foregoing description, one skilled in the art can easily ascertain the essential characteristics of this invention and, without departing from the spirit and scope thereof, can make various changes and modifications of the invention to adapt it to various usages and conditions.

(13) The entire disclosures of all applications, patents and publications, cited herein and of corresponding French Application No. 13/62984, filed Dec. 19, 2013 are incorporated by reference herein.