Coating composition for interior walls and floors and exterior walls

Abstract

The present invention proposes a coating composition for interior and exterior walls, the composition being based in particular on marble powder, rock powder and plant additive powder, the coating composition having a very low environmental impact and good technical performance.

Description

Description Title of the invention: Coating composition for interior walls and floors and exterior walls

[0001] The present invention relates to a coating composition for interior walls, floors and ceilings and exterior walls.

[0002] Interior and exterior walls are often exposed to wear, stains, and atmospheric agents. It is therefore necessary to protect them with an appropriate coating.

[0003] Traditional coatings are often made with chemicals that can be harmful to the environment. They can also be difficult to apply and have poor resistance to wear and stains.

[0004] The present invention provides a coating composition for interior walls, floors and ceilings and exterior walls which has a very low environmental impact and good technical performance.

[0005] The composition according to the invention comprises: - at least one marble or beatite powder, preferably at least two different marble powders; - at least one rock selected from the group comprising pozzolan, ceramsite, vermiculite, perlite, expanded cork or a mixture thereof, - at least one binder selected from the group comprising lime, white cement, mortar, raw earth, hemp concrete or a mixture thereof; - at least one filler selected from the group comprising micronized silica, glass powder, quartz powder, clay powder, ceramic powder, or a mixture thereof; - at least one plant additive selected from the group comprising flax powder, flax flour, coconut powder, hemp powder.

[0006] According to one embodiment, at least one marble powder has a particle size of between 0.002 and 0.04 μm, preferably between 0.002 and 0.01 μm, even more preferably from 0.002 to 0.004 μm. The particle size of 0.003 μm makes it possible to obtain a coating with a fine and homogeneous appearance.

[0007] According to one embodiment, at least one marble powder has a particle size of between 1 and 5 pm, preferably between 2 and 4 pm, even more preferably 4 pm.

[0008] According to one embodiment, the composition according to the invention comprises two different marble powders, the first having a particle size of between 0.002 and 0.04 μm, preferably between 0.002 and 0.01 μm, even more preferably from 0.002 to 0.004 μm and the second having a particle size of between 1 and 5 μm, preferably between 2 and 4 μm, even more preferably 4 μm.

[0009] According to one embodiment, the marble powder is selected from the group comprising powder: Carrara marble, Canicatti marble (or “Sicilian marble in strands”), Bergamo marble, Calacatta marble, Thassos marble, Botticino marble, Cipollin marble and their mixture; preferably the composition comprises a mixture of Carrara marble powder and Canicatti marble powder.

[0010] Carrara marble is a natural marble that is known for its beauty, hardness, and strength. According to one embodiment, the grain size of Carrara marble is 0.002 to 0.04 μm, preferably between 0.002 and 0.01 μm, even more preferably 0.002 to 0.004 μm. The grain size of 0.002 to 0.004 μm allows for a coating with a fine and homogeneous appearance.

[0011] Particle size is a measure of the grain size of a material. It is expressed in millimeters or microns. The particle size of a material is important because it determines its mechanical, physical, and chemical properties.

[0012] Sicilian marble is a natural marble known for its strength and durability. The marble strands help strengthen the structure of the coating and improve its abrasion resistance. According to one embodiment, the grain size of the Sicilian marble strands is between 1 and 5 μm, preferably between 2 and 4 μm, and even more preferably 4 μm. The grain size of 4 μm allows for a coating with a fine and uniform appearance.

[0013] According to one embodiment, at least one rock is pozzolan: pozzolan is a natural material which is used as an additive to improve the application opening time of the product (lifetime 10 hours).

[0014] According to one embodiment, the composition comprises at least lime and white cement as binder. Lime is a natural material that is used as a binder for coatings. It contributes to the good adhesion of the coating to the support and its malleability. White cement: white cement is a synthetic material that is used as a binder for coatings. It contributes to the strength and durability of the coating and its petrification.

[0015] According to one embodiment, at least one filler is micronized silica: micronized silica is a natural material that is used as a filler for coatings. It contributes to the stability of the coating and its resistance to abrasion.

[0016] According to one embodiment, at least one plant additive is flax powder: flax powder is a natural material that is used as an additive to improve the appearance and properties of the coating. It contributes to the softness and brightness of the coating and its microporosity and gives significant acoustic and thermal characteristics.

[0017] Flax powder is a natural product obtained by micronization of flax fibers. The micronization process consists of grinding the flax fibers into fine particles. According to one embodiment, the particle size of the flax powder is < 1 mm

[0018] According to another embodiment, the particle size of the flax powder is 0.2 to 0.3 mm, preferably 0.1 to 0.25 mm, even more preferably 0.3 mm.

[0019] According to one embodiment, the composition comprises: - From 15% to 30%, preferably from 20% to 25%, more preferably from 23% to 24% by weight of at least one marble or beatite powder; - From 5% to 15%, preferably from 10% to 15%, more preferably from 11% to 13% by weight of at least one rock; - From 10% to 25%, preferably from 15% to 20%, more preferably from 15% to 18% by weight of at least one binder; - From 3% to 10%, preferably from 5% to 8%, more preferably from 5.5% to 7.5% by weight of at least one filler; - From 3% to 10%, preferably from 4% to 6%, more preferably from 4.5% to 5.5% by weight of at least one plant additive.;

[0020] According to a preferred embodiment of the invention, the composition according to the invention comprises Carrara marble, Sicilian marble in Canivati ​​strands, pozzolan, lime, white cement, micronized silica, and linseed flour.

[0021] According to a preferred embodiment of the invention, the composition comprises: - From 10 to 15%, preferably from 10 to 12%, more preferably from 10.5% to 11.5% by weight of marble powder with a particle size of between 0.002 and 0.04 pm, preferably between 0.002 and 0.01 pm, even more preferably from 0.002 to 0.004 pm and / or being a Carrara marble powder; - From 10% to 15%, preferably from 10% to 12%, more preferably from 10.5% to 11.5% by weight of marble powder with a particle size of between 1 and 5 pm, preferably between 2 and 4 pm, even more preferably 4 pm and / or being a Canicatti marble powder; - From 6% to 8%, preferably from 6.5% to 7.5%, more preferably from 6.8% to 7.8% by weight of pozzolan; - From 7% to 8%, preferably from 7.2% to 7.9%, more preferably from 7.5% to 7.8% by weight of lime; - From 5% to 8%, preferably from 5.5% to 7.5%, more preferably from 6.5% to 7.9% by weight of white cement; - From x 5% to 7.5%, preferably from 5.5% to 7%, more preferably from 5.5% to 7.2% by weight of micronized silica; - From 5% to 8%, preferably from 5.5% to 7.8%, more preferably from 5.8% to 7.9% by weight of flax powder.

[0022] According to one embodiment, the composition is implemented in the form of a powder to be mixed with water before use. The mixture is applied to the support using a traditional coating technique.

[0023] The composition of the invention has a very low environmental impact because it is formulated on a water-based basis. It is also easy to apply and has high hardness and adhesion, as well as resistance to abrasion, stains, atmospheric agents, UV rays, with an A+ classification and significant thermal and acoustic performance, etc. The composition of the invention has the following advantages: - A very low environmental impact because it is formulated with water - Ease of application - High hardness and adhesion - Resistance to abrasion, stains, atmospheric agents, UV rays, - An A+ ranking - Significant thermal and sound performance, etc. Example :

[0024] Example 1: Determination of thermal conductivity

[0025] A coating composition according to the invention was prepared, comprising in total weight of the composition: Carrara marble (23%), pozzolan (12%), lime (15%), quartz powder (6%), flax powder (5%).

[0026] The thermal conductivity / resistance measurements were carried out in accordance with the provisions of international standard NF EN 12664, using a “PCG” guarded hot plate type conductivity meter (ISO 8302).

[0027] The determination of the thermal conductivity limit values ​​representing 90% and 10% of the density range was carried out on the basis of 3 thermal conductivity measurements (6 test pieces).

[0028] The average value of the measured thermal conductivities is: 0.191 W / (mK)

[0029] The average density of the 6 samples is: 1021.3 kg / m3

[0030] The standard deviation of the 6 densities is: 18.37 kg / m3

[0031] The value of the broadening coefficient k2 for 6 values ​​is taken as 2.49.

[0032] The table below gives the upper and lower limits representing 90% and 10% of the density range:

[0033] [table 1] [00341 Example 2: Determination of the sound absorption coefficient

[0035] The purpose of the test is to characterize the acoustic absorption of a coating composition according to example 1.

[0036] Plasterboards were coated with plaster. Sound absorption coefficient measurements were taken first on the raw plasterboards and then again on the plasterboards coated with plaster.

[0037] The measurement is carried out in a reverberation room in accordance with the requirements of standard NF EN ISO 354: 2004. The sound absorption coefficient q sis measured in third-octave frequency bands from 100 Hz to 5 kHz.

[0038] For practical use, the average coefficients per octave band c are also given P as well as the weighted sound absorption index cw, as defined in standard NF EN ISO 11654:1997.

[0039] Description and assembly of the sample

[0040] [table 2]

[0041] The room complies with the recommendations of the NF EN ISO 354:2004 standard. The four vertical walls are not parallel in pairs. The ceiling is horizontal. Its volume is 218 m 3 The room contains nine suspended diffusers. These are slightly curved PVC panels with the following dimensions: seven panels measuring 2 m x 1 m and two panels measuring 0.8 m x 1 m.

[0042] Weather conditions

[0043] [table 3]

[0044] The measurement and data processing chain consists of: ■ 2 Brüel & Kjaer type 1405 random noise generators ■ 1 Brüel & Kjaer type 2143 analyzer ■ 8 microphones + Brüel & Kjaer preamplifier type 4133 / 2639 ■ 1 Brüel & Kjaer type 2811 track selector ■ 1 Brüel & Kjaer type 4231 calibrator ■ 1 PC type calculator ■ 1 ROTRONIC - Hydrolog thermo-hygrometric probe (S / N 60072354; COFRAC certificate IN104054 / 17, July 2023, frequency 24 ± 3 months) ■ 1 ROTRONIC - Hydrolog Barometer (THBAR1; COFRAC IN104569 / 1 Certificate, February 2024, frequency 24 ± 3 months)

[0045] The sample is subjected to random noise covering the useful frequency band. Two omnidirectional sound sources are used. Measurements are carried out successively with each source. The decay of the sound, after stopping the source, is recorded using an analyzer in a third-octave frequency band from 100 Hz to 5 kHz for a duration of 20 seconds (minimum) to 25 seconds (maximum, empty room). The decay curve is discretized by linear integrations of duration 100 ms or 150 ms, depending on the reverberation time. At each of the 8 measurement points, an average is taken over 5 successive decays. The reverberation times are calculated by linear regression over an interval between 20 and 30 decibels. The results are averaged over the 16 measurements (8 microphone positions x 2 sound sources).

[0046] Conclusion

[0047] The table below compares the practical alpha absorption coefficient to P as well as the a-weighted sound absorption index w , for the 2 samples measured.

[0048] [table 4]

[0049] The weighted sound absorption coefficient aw of plasterboards covered with plaster according to the invention is equal to 0.15, which corresponds to the attribution of class E of sound absorption, according to Annex B of the standard NF EN ISO 11654:1997. In contrast, the weighted sound absorption coefficient aw of plasterboards is equal to 0.10, which corresponds to the attribution of class 'Not classified' of sound absorption, according to Annex B of the standard NF EN ISO 11654:1997.

[0050] The coating composition according to the invention therefore offers significant acoustic comfort.

Claims

Claims

1. Coating composition for interior walls, floors and ceilings and exterior walls comprising: - at least one marble or beatite powder, - at least one rock selected from the group comprising pozzolan, ceramsite, vermiculite, perlite, expanded cork or a mixture thereof, - at least one binder selected from the group comprising lime, white cement, mortar, raw earth, hemp concrete or a mixture thereof; - at least one filler selected from the group comprising micronized silica, glass powder, quartz powder, clay powder, ceramic powder, or a mixture thereof; - at least one plant additive selected from the group comprising flax powder, flax flour, coconut powder, hemp powder.

2. Coating composition according to claim 1, characterized in that at least one marble powder has a particle size of between 0.002 and 0.04 pm, preferably between 0.002 and 0.01 pm, even more preferably from 0.002 to 0.004 pm or between 1 and 5 pm, preferably between 2 and 4 pm, even more preferably 4 pm.

3. Coating composition according to claim 1, characterized in that it comprises two different marble powders, the first having a particle size of between 0.002 and 0.04 pm, preferably between 0.002 and 0.01 pm, even more preferably from 0.002 to 0.004 pm and the second having a particle size of between 1 and 5 pm, preferably between 2 and 4 pm, even more preferably 4 pm.

4. Coating composition according to any one of claims 1 to 3, characterized in that the marble powder is selected from the group comprising powder: Carrara marble, Canicatti marble (or "Sicilian marble in strands"), Bergamo marble, Calacatta marble, Thassos marble, Botticino, cipolin marble and mixtures thereof; preferably the composition comprises a mixture of Carrara marble powder and Canicatti marble powder.

5. Coating composition according to any one of claims 1 to 4, characterized in that at least one rock is pozzolan.

6. Coating composition according to any one of claims 1 to 5, characterized in that it comprises as binder at least lime and white cement.

7. Coating composition according to any one of claims 1 to 6, characterized in that at least one filler is micronized silica.

8. Coating composition according to any one of claims 1 to 7, characterized in that at least one plant additive is flax powder.

9. Coating composition according to claim 8, characterized in that the flax powder has a particle size of 0.2 to 0.3 mm, preferably 0.1 to 0.25 mm, even more preferably 0.3 mm.

10. Coating composition according to any one of claims 1 to 9, characterized in that it comprises: - From 15% to 30%, preferably from 20% to 25%, more preferably from 23% to 24% by weight of at least one marble or beatite powder; - From 5% to 15%, preferably from 10% to 15%, more preferably from 11% to 13% by weight of at least one rock; - From 10% to 25%, preferably from 15% to 20%, more preferably from 15% to 18% by weight of at least one binder; - From 3% to 10%, preferably from 5% to 8%, more preferably from 5.5% to 7.5% by weight of at least one filler; - From 3% to 10%, preferably from 4% to 6%, more preferably from 4.5% to 5.5% by weight of at least one plant additive.

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