FORMULATION FOR AN ACOUSTIC FLOOR COVERING, INTERIOR OR EXTERIOR FLOOR COVERING COMPRISING IT AND METHOD FOR PRODUCING THIS FLOOR COVERING

Abstract

FORMULATION FOR AN ACOUSTIC FLOOR COVERING, INTERIOR OR EXTERIOR FLOOR COVERING COMPRISING IT AND METHOD FOR PRODUCING THIS FLOOR COVERING The invention relates to a formulation for a floor covering, characterized in that it comprises: for the formation of a layer called grid (II) on the floor to be covered: at least one cereal husk (B); and a composition based on a resin curable at room temperature (R1), (B) representing 15 to 50 parts by weight per 100 parts by weight of the composition (R1); for the formation of a filling layer (III) on the grid layer (II): powder (P) of at least one cereal husk; anda composition based on a resin curable at room temperature (R2), (P) representing 15 to 50 parts by weight per 100 parts by weight of the composition (R2). Figure to be published: Figure 1

Description

Title of the invention: FORMULATION FOR AN ACOUSTIC FLOOR COVERING, INTERIOR OR EXTERIOR FLOOR COVERING COMPRISING IT AND METHOD FOR PRODUCING THIS FLOOR COVERING

[0001] The present invention relates to a formulation for producing a floor covering, an interior or exterior floor covering consisting of this acoustic covering or comprising it, and a method for producing this floor covering.

[0002] French patent application 2,439,855 discloses a floor covering consisting of an underlayer of elastic material coated with a relatively hard surface layer, the two layers being poured on site, the coating layer being sanded after drying. The underlayer is made from rubber granules embedded in a prepolymer from the polyurethane family. The surface layer is made of a two-component polyether-polyester / aromatic isocyanate coating. The production of the floor covering consists of: • applying rubber granules coated with a prepolymer to the ground and allowing the latter to polymerize; • applying a coating to the upper surface of the undercoat, said coating hardening by reaction of N=C=O groups on -OH groups; and • to sand the upper surface.

[0003] This process has the disadvantage that the rubber dust during the sanding operation generates toxic and allergenic rubber microparticles.

[0004] The applicant company sought to resolve this problem by proposing a flexible floor covering, while retaining, or even improving, the flexible nature of the covering, and taking into account the sustainable nature of the product by using, no longer synthetic rubber, but materials derived from agricultural waste.

[0005] To this end, according to the present invention, a floor covering formulation is provided comprising a flexible layer of acoustic grid which is made of cereal husk embedded in a resin and which is coated with a hard layer made of cereal husk powder embedded in a resin. The dust generated by sanding is in this case neither toxic nor allergenic.

[0006] The invention offers the additional advantages that it does not use rubber, such as EPDM and SBR of fossil origin, but cereal chaff from so-called coated cereals, which is a waste that the invention allows to be recycled.

[0007] Furthermore, an acoustic character is provided by the fact that air spaces are formed between the fragments which constitute the cereal bale and which are coated with resin in the part of the coating called “grid” as indicated below.

[0008] The present invention therefore firstly relates to a formulation for a floor covering, characterized by the fact that it comprises: • for the formation of a layer called grid (II) on the ground to be covered: • at least one bale of cereal (B); and • a composition based on a resin curable at room temperature (Rl),

[0009] (B) representing 15 to 50 parts by weight per 100 parts by weight of the composition (RD; • for the formation of a filling layer (III) on the grid layer (II): • powder (P) from at least one grain bale; and • a composition based on a resin curable at room temperature (R2),

[0010] (P) representing 15 to 50 parts by weight per 100 parts by weight of the composition (R2).

[0011] The formulation according to the invention may also comprise: • for the formation of at least one finishing filling layer (IV): • powder (P) as defined above; and • a composition based on a resin curable at room temperature (R3),

[0012] (P) representing 15 to 50 parts by weight per 100 parts by weight of the composition (R3).

[0013] By "room temperature curable resin composition (RI, R2 or R3)" is meant a resin curable at a temperature of 10 to 35°C.

[0014] The cereal balls comprising (B) and (P) may be independently selected from rice, einkorn, millet, rye, buckwheat, oat, wheat, einkorn and sorghum balls and mixtures thereof, the largest dimension of a cereal ball (B) being in particular 1 to 15 mm, and the average dimension of the cereal ball powder (P) being in particular 50 to 500 pm. The average dimension of the powder particles (P) responds to a granulometric analysis by Mastersizer 2000.

[0015] The compositions based on a resin curable at room temperature (RI), (R2) or (R3) may be compositions capable of flowing to form respectively, after curing, said grid layer, said filling layer and said at least one finishing filling layer, and are chosen independently from: • compositions, curable with atmospheric humidity, based on at least one polyether with silane terminations, which can be combined with at least a polysiloxane and / or at least one co-crosslinker; • compositions, curable with atmospheric humidity, based on at least one polyurethane as a single-component resin; • chemically curable compositions based on at least one polyurea resin resulting from the reaction of a polyaspartic ester or polyaspartic ether component and a polyisocyanate hardener component.

[0016] In particular: • a polyether with silane terminations can be chosen from those of formulas (2) to (4): Z1— R8—NH—G—[0R7]m —[O—C—NH—R8—NH—C-[0R7]m ]mi^ O—G—NH—Rs—Z1 Il II II II 0 0 O o (2) Z2—R'8—N—C—NH—R'8—[NH—C—[OR'7]n2-O—C—NH—R,8]m2~NH—G—N—R'6—? I he he 31 II I R'9 OO 0 OR'S (3) Z3_R10_[ORi,7]n3—RW—Z3 (4)

[0017] in which: • Z1, Z2, Z3 each represent -SiR3pn(OR12)p, with p=0, 1 or 2, in particular 0 or 1; and R11 and R12, identical or different, each being a linear or branched C1-C6 alkyl radical; • R6, R'6 each represent a divalent alkylene radical, linear or branched, in CrC6; • R7, R'7 each represent a divalent alkylene radical, linear or branched, in C2-C4; • R8, R'8 each represent a C5-C15 hydrocarbon radical, aromatic or aliphatic, linear, branched or cyclic; • R9, R'9 each represent hydrogen, phenyl, linear, branched alkyl or cyclic C1-C6 or a 2-succinate radical of formula R13—O(O)C—CH2—CH—C(O)O—R13 ' I

[0018] R13 being a linear or branched C1-C6 alkyl radical; • nb n2, n3 are non-null integers; • mi is zero or a non-zero integer; • ni and mb n2 and m2, and n3 are such that the weight average molecular mass of the polyether of formula (2), (3) and (4) respectively is 4000 to 30000 g / soft ;

[0019] being in particular that of the formula: (R12O)3-p(R1 1 p )Si—R6—NH—C—[OR^ — O—C—NH—R6—Si( R11 )p( O R12)3-p OO

[0020] (2a)

[0021] in which R6, R7, R11, R12, ni and p are as defined above, in particular R11 and R12 represent methyl, p is equal to 1, and R6 is methylene or ethylene or propylene.

[0022] The polysiloxane may be chosen from those having

[0023] CeHs units and / or CHs units and / or units —O—Si—O— — O—Si—O— O CH3 I CHs —O—If— O— O I

[0024] being in particular a condensation polysiloxane of C6H5-Si-(OCH3)3 and CH3 -Si-(OCH3)3 or a condensation polysiloxane of C6H5-Si-(OCH3)3, having in particular a weight-average molecular mass of 700 to 2500 g / mol.

[0025] The composition based on a polyether with silane terminations, where appropriate in combination with a polysiloxane, may contain at least one aminosilane co-crosslinking agent chosen in particular from the silanes of formula (1):

[0026] (R1)(R2)N-R3-SiR43q(OR5)q(l)

[0027] in which: - R1 and R2 each represent hydrogen, linear C1-C6, branched C2-C8 or cyclic C6-C18 alkyl; amino-C1-C12 alkyl; - R3 represents CrCi8 alkylene; - R4 and R5, identical or different, are each a linear or branched C1-C6 alkyl radical; - q is 0, 1 or 2, being in particular 0 or 1, and

[0028] in particular among: aminopropyltrimethoxy silane, aminopropyltriethoxy silane, aminopropylmethyl-dimethoxysilane, aminopropylmethyldiethoxysilane, N-

[0029]

[0030]

[0031]

[0032]

[0033] (2-aminoethyl) aminopropyltrimethoxysilane, N- (2-aminoethyl)aminopropyltriethoxysilane, N- (2-aminoethyl)aminopropyltrimethyldimethoxysilane, cyclohexylaminomethyltriethoxysilane, cyclohexylaminomethylethoxysilane, N- cyclohexylaminomethyltrimethoxysilane and N- cyclohexylaminomethylmethyldimethoxysilane. The composition based on a polyether with silane terminations in combination with a polysiloxane may comprise: A. 15 to 65 parts by weight, preferably 25 to 60 parts by weight, of said silane-terminated polyether(s); B. 85 to 35 parts by weight, preferably 75 to 40 parts by weight, of said polysiloxane(s); C. 1 to 8 parts by weight, preferably 2 to 6 parts by weight of said aminosilane co-crosslinker(s), the quantity of (A)+(B) representing 100 parts by weight and the quantity of (C) being given per 100 parts by weight of (A)+(B). A polyurethane may be a reaction product of a polyether polyol and a hexamethylene disocyanate. For the formation of a polyurea, • the polyaspartic ester component can be represented by formula (5): HH II N -C-COOR20 I H2C—COOR21 in which: r is an integer from 2 to 4; X is an aliphatic remainder; and R20 and R21 each independently represent an organic group which is inert to isocyanate groups, and the aspartic polyether ester component can be represented by formula (6): HH (O—R22 4- N —C—COOR23 I H2C—COOR24

[0034]

[0035] in which: t is an integer from 2 to 4; s independently represents an integer from 1 to 5; Z is an aliphatic remainder; R22 represents C1-C6 alkyl; R23 and R24 each independently represent an organic group which is inert towards isocyanate groups, or by formula (7):

[0036]

[0037] in which: • v is an integer from 2 to 4; • u is independently an integer from 1 to 5; • Z' represents an aliphatic residue; • R26 independently represents C1-C6 alkyl; • R27 and R28 each independently represent an organic group which is inert towards isocyanate groups. A composition based on a resin curable at room temperature (RI), (R2) or (R3) may further comprise, per 100 parts by weight of said resin curable at room temperature, at least one of: • at least one anti-termite and insect repellent agent, such as the compound of formula (8):

[0038] in particular at a rate of 10 to 30 parts by weight; at least one UV stabilizer chosen in particular from hindered amines, benzotriazole, benzophenone and hydroxytriazine, in an amount in particular of 0.1 to 4 parts by weight; at least one moisture absorber, such as an aluminosilicate, in an amount in particular of 1 to 3 parts by weight; at least one colorant, in particular in an amount of 5 to 15 parts by weight; and • at least one flame retardant filler, in particular in an amount of 0.1 to 15 parts by weight.

[0039] The present invention also relates to a floor covering, characterized in that it comprises successively, starting from the layer applied to the floor: I. an underlayer for preparing the floor to be covered; II. a grid layer resulting from the hardening at room temperature of the mixture (B) + composition based on (RI) applied in layer(s) on the floor to be covered; III. a layer of filling of the upper region of the grid layer (II), resulting from the hardening at room temperature of the mixture (P) + composition based on (R2) applied in layer(s); IV. where applicable, at least one finishing filling layer (IV), resulting from the hardening at room temperature each time of a mixture (P) + composition based on (R3) applied in layer(s),

[0040] the constituents (B), (P), (RI), (R2) and (R3) and their relative proportions being as defined above.

[0041] The undercoat (I) for preparing the floor to be coated may be a primer layer with a thickness of 100 to 500 μm, said primer being chosen in particular from polyurethanes, epoxies and polyethers with silane terminations.

[0042] The layer (II) has in particular a thickness of 6 to 10 mm after its formation and the filling part which is formed by the layer (III) and where appropriate the layer(s) (IV) and of which at least one part occupies the upper part of the grid layer has in particular a total thickness of 500 to 3000 μm.

[0043] Layer (III) or (IV) may have received: • in the case of an exterior floor covering, for pedestrian use, a finishing layer (V) consisting of a film (Va) of varnish or paint with a thickness in particular of 100 to 500 μm or of a layer (Vb) of a resin composition whose resin has been chosen in particular from those included in the composition of the layer (III), or of a layer (Vb) as defined above on which is placed a film (Va) as defined above; and • in the case of an interior floor covering, a finishing layer such as layer (V) defined above or a finishing covering chosen from polished concrete, parquet, linoleum, tiling, textile carpet, stone carpet, poly(vinyl chloride) covering.

[0044] The Shore A hardness according to ISO 868 of layer (III) can be between 45 and 100, in particular between 45 and 85.

[0045] The present invention also relates to a method of manufacturing a floor covering as defined above, characterized in that it comprises the following steps: following provisions: a. application of a primer undercoat (I) to the floor to be coated; b. where appropriate, leveling with a resin that hardens at room temperature such as resins (RI), (R2), (R3); c. mixing (B) and the composition based on (RI) and, on the primer undercoat once dry and having undergone leveling if necessary, spreading the mixture obtained to form the layer (II) which is allowed to dry; d. sanding the surface of layer (II) formed in step c) once it is dry; e. mixing (P) and the composition based on (R2) and, on the layer (II), spreading the mixture obtained to form a layer (III) which penetrates into the surface region of the layer (II) and which is caused to dry; f. sanding the surface of the layer (III) formed in step (d) once it is dry; g. mixing (P) and the composition based on (R3), and, on the layer (III), spreading the mixture obtained to form a finishing filling layer (IV); h. sanding the surface of the layer (IV) formed in step (g) once it is dry; i. where appropriate, repeating steps (g) and (h) at least once to form an additional finishing filling layer each time; j. providing a top coat or finishing coating as defined above.

[0046] The different layers (I) to (IV) can be dried for 24 to 48 hours at 20°C.

[0047] The following Examples illustrate the present invention without, however, limiting it. scope.

[0048] In these Examples: • the constituents denoted GENIOSIL® are those marketed by the company WACKER CHEMIE AG under the respective names indicated:

[0049] GENIOSIL® XB 502: polyether of formula (2) with ml=0, p=2, R11, R12 = methyl, R6 = methylene, having a weight-average molecular mass of approximately 8500 g / mol, in a mixture with a condensation polysiloxane of C6H5-Si-(OCH3)3 and CH3-Si-(OCH3)3, with a weight-average molecular mass of approximately 1900 g / mol, in a weight ratio of 34:66 polyether:polysiloxane

[0050] GENIOSIL® E-10: polyether of formula (2) with ml=0, p=2, R11, R12 = methyl, R6 = methylene, and a weight-average molecular mass of approximately 8900 g / mol

[0051] GENIOSIL® GF9: amino-silane co-crosslinker

[0052] GENIOSIL® T: UV stabilizer and moisture absorber • the constituents noted DESMODUR® and DESMOPHEN® are those marketed by the COVESTRO Company under the respective names indicated:

[0053] DESMODUR® XP 2617: NCO-terminated prepolymer based on hexamethylene 1,6-diisocyanate (HDI) and an ether diol: reaction product of an aliphatic polyether polyol and HDI having an NCO equivalent of 336, an NCO content of 12.5% ​​by mass, an NCO functionality of about 2.0, an HDI monomer content of less than 0.5% by mass and a viscosity according to ISO 3219 of about 4250 rnPa.s at 23°C.

[0054] DESMOPHEN® NH 1420: having an amino group functionality of 2.0, an amino group equivalent of 279 and a viscosity according to ISO 3219 of 900-2000 mPa.s at 23°C.

[0055] DESMOPHEN® NH 1720: amino-functional co-reactant for polyisocyanates

[0056] DESMODUR® E 30700: prepolymer containing aliphatic ester groups based on HDI

[0057] DESMODUR® ULTRA N 3900: HDI-based aliphatic trimer, having a solids content of 100% by mass, an NCO content of 23.5% by mass, an HDI monomer content of less than 0.25% by mass, a viscosity of approximately 730 rnPa.s according to ISO 3219 at 23°C and an NCO functionality of 3.0-3.5 • the other constituents designated by their trade names are:

[0058] CARDOLITE NX 2026: purified cashew nut oil marketed by the company CARDOLITE EUROPE

[0059] RAL 7030 coloring base: coloring agent marketed by the company HOLLAND COLORS

[0060] TEGO® AIREX 900: organo-modified polysiloxane de-sparkling agent containing fumed silica marketed by the company EVONIK

[0061] TEGO® AIREX 944: de-aerating agent marketed by the EVONIK Company

[0062] Sylosiv® A4: micronized, highly porous, crystalline, molecular sieve aluminosilicate with pore openings of approximately 4Å, moisture absorber, marketed by GRACE Company

[0063] [Fig.l] of the accompanying drawing schematically illustrates the formation of an acoustic floor covering according to the present invention, by showing four partial vertical sectional views through the covering being formed according to steps a) and c), d), e) and f), and g) and h) as defined in the above description.

[0064] Figures 2 to 7 are photographs of the surface condition of the coating of Example 1 at the following respective stages: - end of stage c); - end of step d); - after application of the filling layer, i.e. end of step e); - after sanding, i.e. end of step f); - after application of the finishing backfill layer, i.e. end of stage g) ; and - after application of the finishing layer, i.e. end of step j). Example 1

[0065] In this example, the following resin-based compositions (RI) and (R2) were used:

[0066] [Tables 1] Resin-based composition Formation of layer (II) Quantity of components Formation of layer (III) and layer (IV) Quantity of components Resin RI GENIOSIL® XB 502 66.6 pp GENIOSIL® E-10 28.6 pp GENIOSIL® GF9 4.8 pp Density* 1.10-1.5 Viscosity** 850-1000 mPa.s Resin R2 GENIOSIL® XB 502 100 pp Density* 1.10-1.5 Viscosity** 950-1100 mPa.s Additives CARDOLITE NX 2026 19 PP CARDOLITE NX 2026 20 pp RAL 7030 colorant base 9.5 pp RAL 7030 colorant base 10 PP GENIOSIL® T 1.9 pp GENIOSIL® T 2 PP TEGO® AIREX 900 1.5 pp

[0067] the quantities of the constituents are given in parts by weight (pp)

[0068] * density at 20°C according to NFT 30.020

[0069] ** viscosity at 25°C using the Elcometer viscometer Steps a) and c)

[0070] Before installation, it was ensured that the ambient conditions were as follows: operating temperature: +10°C to +30°C and maximum humidity: 90%.

[0071] On an interior floor to be coated, two successive undercoats of primer (I) were applied by roller, each formed from the resin composition RI of Table 1 at a rate of 200g of Rl / m2. It was left to harden for 4-5 hours.

[0072] Rice husk of 6.5 to 8.5 mm and the RI resin composition were added to a vertical shaft mixer and mixed until the rice husk was completely coated by the resin composition and homogeneously. 7 kg of RI resin were used for 3 kg of rice husk. It was applied using a manual "Flemish" type smoother on the hardened primer undercoats, at a rate of 5 kg of the mixture / m2.

[0073] The smoother was regularly passed through a propylene carbonate type diluent to facilitate the spreading and tightening of the rice husk coated with the RI resin composition. The setting time at 20°C of the RI resin composition / rice husk mixture was 4-5 hours. Step d)

[0074] After hardening the grid layer (II) thus formed, the latter was sanded using an 80, then 120 abrasive disc and dusted by suction. Step e) and f)

[0075] Micronized rice husk powder (0-300 pm) and the resin composition R2 of Table 2 were thoroughly mixed for 2 to 3 minutes to form a patching mixture in the weight proportions of resin R2:rice husk powder 100:30.

[0076] The use time of this pore-filling mixture was 20 to 30 minutes.

[0077] It was applied at a rate of 2 kg / m2 to the previously hardened grid layer (II), in a circular back-and-forth movement, from front to back, using a rubbing brush. The rubbing brush was held as inclined as possible so that the mixture penetrated the grid to a depth of 1 to 4 mm depending on the "tightness" of the grid. "Tightness" means the size of the air spaces in the grid. The tighter the tightness, the fewer air spaces there will be.

[0078] It was left to harden for 24-48 hours at 20°C.

[0079] The surface of the filling layer (III) thus formed was then sanded using a 120 then 180 abrasive disc, and dust removed. Steps g), h) and j)

[0080] The rice husk powder and the resin composition R2 of Table 1 were again well mixed to form a mixture in the weight proportions resin R2:micronized rice husk powder 100:30 which was applied to the previously formed cured filling layer (III) in the same way at a rate of 0.350 g / m2. It was left to cure for 24-48 hours at 20°C.

[0081] The surface of the finishing filling layer (IV) thus obtained was then sanded using a 120 then 180 abrasive disc, then a colorless finishing varnish was applied using a medium-length pile roller at a rate of 150 g / m2 in two coats with an interval of 24 hours between the two.

[0082] The colorless finishing varnish (V) was a two-component water-based polyurethane varnish. The varnish chosen will be satin or matte depending on the user's choice. Example 2

[0083] Example 1 was repeated replacing the rice husk with spelt husk.

[0084] [Tables2] Resin-based composition Formation of layer (II) Quantity of constituents Formation of layer (III) and layer (IV) Quantity of constituents RI resin DESMODUR® XP 2617 100 pp Density* 1.10-1.5 Viscosity** 2000-3000 mPa.s R2 resin DESMOPHEN ® NH 1420 40 pp DESMOPHEN ® NH 1720 10 PP DESMODUR® E 30700 40 pp DESMODUR® ULTRA N 3900 10 PP Density* 1.10-1.5 Viscosity** 1000-1200 mPa.s Additives CARDOLITE NX 2026 20 pp CARDOLITE NX 2026 10 PP RAL color base 7030 10 PP RAL color base 7030 5 PP Sylosiv® A4 1.5 pp Sylosiv® A4 0.75 pp TEGO® AIREX 900 0.5 pp TEGO® AIREX 900 0.25 pp

[0085] the quantities of the constituents are given in parts by weight (pp)

[0086] * density at 20°C according to NFT 30.020

[0087] ** viscosity at 25°C using the Elcometer viscometer Steps a) and c)

[0088] Before installation, it was ensured that the ambient conditions were as follows: operating temperature: +10°C to +30°C and maximum humidity: 85%.

[0089] On an interior floor to be coated, two successive undercoats of primer (I) were applied by roller, each formed from the resin composition RI of Table 2 at a rate of 200g of Rl / m2. It was left to harden for 4-5 hours.

[0090] Small spelt husk of 8 to 15 mm and the RI resin composition were added to a vertical shaft mixer and mixed until the small spelt husk was perfectly coated by the resin composition and homogeneously. 7 kg of RI resin were used for 3 kg of small spelt husk. It was applied using a manual "Flemish" type smoother on the hardened primer undercoats, at a rate of 5 kg of the mixture / m2.

[0091] The smoother was regularly passed through a propylene carbonate type diluent to facilitate the spreading and tightening of the spelt bale coated with the RI resin composition. The setting time at 20°C of the RI resin composition / spelt bale mixture is 4-5 hours. Step d)

[0092] After hardening the grid layer thus formed (II), the latter was sanded using an 80, then 120 abrasive disc and dusted by suction. Step e) and f)

[0093] Micronized einkorn husk powder (0-300 pm) and the resin composition R2 of Table 2 were thoroughly mixed for 2 to 3 minutes to form a filling mixture in the weight proportions of resin R2:einkorn husk powder 100:30.

[0094] The usage time of this mixture was 20 to 30 minutes.

[0095] It was applied at a rate of 2 kg / m2 on the previously hardened grid layer (II), in a circular back and forth movement, from front to back, using a rubbing brush. The rubbing brush was held as inclined as possible so that the mixture penetrated the grid to a depth of 1 to 4 mm depending on the "tightness" of the grid.

[0096] It was left to harden for 24-48 hours at 20°C.

[0097] The surface of the filling layer (III) thus formed was then sanded using a 120 then 180 abrasive disc, and dust removed. Steps g), h) and j)

[0098] The einkorn husk powder and the resin composition R2 of Table 2 were again well mixed to form a mixture in the proportions resin R2:einkorn husk powder 100:30 which was applied to the cured filling layer (III) formed above, at a rate of 0.350 g / m2. It was left to cure for 24-48 hours at 20°C.

[0099] The surface of the filling layer (IV) was then sanded. finish thus obtained using a 120 then 180 abrasive disc, then application using a medium-length pile roller at a rate of 150 g / m2 of a colorless finishing varnish in two coats with an interval of 24 hours between the two.

[0100] The colorless finishing varnish (V) was a two-component water-based polyurethane varnish. The varnish chosen will be satin or matte depending on the user's choice.

Claims

1.

2.

3. Claims - Formulation for a floor covering, characterized by the fact that it comprises: • for the formation of a layer called grid (II) on the ground to be covered: • at least one bale of cereal (B); and • a composition based on a resin curable at room temperature (RI), (B) representing 15 to 50 parts by weight per 100 parts by weight of the composition (RI); • for the formation of a filling layer (III) on the grid layer (II): • powder (P) of at least one grain husk; and • a composition based on a resin curable at room temperature (R2), (P) representing 15 to 50 parts by weight per 100 parts by weight of the composition (R2). - Formulation according to claim 1, characterized in that it further comprises: • for the formation of at least one finishing filling layer (IV): • powder (P) as defined in claim 1 ; and • a composition based on a curable resin (R3), (P) representing 15 to 50 parts by weight per 100 parts by weight of the composition (R3). - Formulation according to one of claims 1 and 2, characterized in that the cereal balls comprising (B) and (P) are independently chosen from rice, small spelt, millet, rye, buckwheat, oat, wheat, large spelt and sorghum balls and their mixtures, the largest dimension of a cereal ball (B) being in particular 1 to 15 mm, and the average dimension of the powder (P) of grain bale being in particular 50 to 500 pm.

4. - Formulation according to one of claims 1 to 3, characterized by the the fact that the compositions based on a resin curable at room temperature (RI), (R2) or (R3) are compositions capable of flowing to form respectively, after curing, said grid layer, said filling layer and said at least one finishing filling layer, and are chosen independently from: • compositions, curable with atmospheric humidity, based on at least one polyether with silane terminations, which can be combined with at least one polysiloxane and / or at least one co-crosslinker; • compositions, curable with atmospheric humidity, based on at least one polyurethane as a single-component resin; • chemically curable compositions based on at least one polyurea resin resulting from the reaction of a polyaspartic ester or polyaspartic ether component and a polyisocyanate hardener component.

5. - Formulation according to claim 4, characterized in that: • a polyether with silane terminations is chosen from those of formulas (2) to (4): Z1—RP— He II II ' He 0 O- o O (2) 1 II III .11 II I R'9O 0 OQR's (3) Z3—R10—[OR"7]n3—R10—Z3 (4) in which: • Z1, Z2, Z3 each represent -SiR3pn(OR12)p , with p=0, 1 or 2, in particular 0 or 1; and R11 and R12, identical or different, each being a linear or branched C1-C6 alkyl radical; • R6, R'6 each represent a divalent alkylene radical, linear or branched, in C1-C6; • R7, R'7 each represent a divalent alkylene radical, linear or branched, in C2-C4; • R8, R'8 each represent a C5-C15 hydrocarbon radical, aromatic or aliphatic, linear, branched or cyclic; • R9, R'9 each represent hydrogen, phenyl, alkyl linear, branched or cyclic in C1-C6 or a 2-succinate radical of formula R1 3_O(O)C—CH2—CH—C(O)O—R13 ' R13 being a linear or branched C1-C6 alkyl radical; • nb n2, n3 are non-null integers; • mi is zero or a non-zero integer; • ni and mb n2 and m2, and n3 are such that the molecular mass weight average of the polyether of formula (2), (3) and (4) respectively is 4000 to 30000 g / mol; being in particular that of the formula: CRl2OMR11:iOSi—R6—NH—CHO^ OO (2a) wherein R6, R7, R11, R12, ni and p are as defined above, in particular R11 and R12 represent methyl, p is equal to 1, and R6 is methylene or ethylene or propylene.

6. - Formulation according to one of claims 4 and 5, characterized by the fact that the polysiloxane is chosen from those having CeHs units and / or QHi units and / or f! —O—Si—O— — O—Si—O— | ï O CHs CH3 —0—If—0— 0 I being in particular a condensation polysiloxane of C6H5-Si-(OCH3)3 and CH3-Si-(OCH3)3 or a condensation polysiloxane of C6H5 -Si-(OCH3)3, having in particular a weight-average molecular mass of 700 to 2500 g / mol.

7. - Formulation according to one of claims 4 to 6, characterized by the fact that the composition based on a polyether with silane terminations, where appropriate in combination with a polysiloxane, contains at least one aminosilane co-crosslinker chosen in particular from the silanes of formula (1): (R1 )(R2)N-R3-SiR43 q(OR5)q( 1 ) in which: - R1 and R2 each represent hydrogen, linear C1-C6, branched C2-C8 or cyclic C6-C18 alkyl; C1-C12 aminoalkyl; - R3 represents CrCi8 alkylene; - R4 and R5, identical or different, are each a linear or branched C1-C6 alkyl radical; - q is 0, 1 or 2, being in particular 0 or 1, and in particular among: aminopropyltrimethoxy silane, aminopropyltriethoxy silane, aminopropylmethyl-dimethoxy silane, aminopropylmethyldiethoxysilane, N-(2-aminoethyl) aminopropyl-trimethoxysilane, N-(2-aminoethyl)aminopropyltriethoxysilane, N-(2-aminoethyl)aminopropyltrimethyldimethoxysilane, cyclohexylamino-nomethyltriethoxysilane, cyclohexylaminomethylethoxysilane, N-cyclohexylaminomethyltrimethoxysilane and N-cyclohexylaminomethylmethyldimethoxysilane.

8. - Formulation according to one of claims 4 to 7, characterized by the fact that the composition based on a polyether with silane terminations in combination with a polysiloxane comprises: A. 15 to 65 parts by weight, preferably 25 to 60 parts by weight of said silane-terminated polyether(s); B. 85 to 35 parts by weight, preferably 75 to 40 parts by weight, of said polysiloxane(s); C. 1 to 8 parts by weight, preferably 2 to 6 parts by weight of said aminosilane co-crosslinker(s), the quantity of (A)+(B) representing 100 parts by weight and the quantity of (C) being given per 100 parts by weight of (A)+(B).

9. - Formulation according to one of claims 4 to 8, characterized by the fact that a polyurethane is a reaction product of a polyether polyol and a hexamethylene diisocyanate.

10. - Formulation according to one of claims 4 to 9, characterized by the fact that, for the formation of a polyurea, • the polyaspartic ester component is represented by the formula (5): HH II N —C—COOR20 H2C-COOR21 in which: • r is an integer from 2 to 4; • X is an aliphatic remainder; and • R20 and R21 each independently represent a group organic which is inert towards isocyanate groups, and • the aspartic polyether ester component is represented by formula (6): HH (O—R22-)- N —C—COOR23 H2C—COOR24 in which: t is an integer from 2 to 4; s independently represents an integer from 1 to 5; Z is an aliphatic remainder; R22 represents C1-C6 alkyl; R23 and R24 each independently represent an organic group which is inert towards isocyanate groups, or by formula (7): in which: • v is an integer from 2 to 4; • u is independently an integer from 1 to 5; • Z' represents an aliphatic residue; • R26 independently represents C1-C6 alkyl; • R27 and R28 each independently represent a group organic which is inert towards isocyanate groups.

11. - Formulation according to one of claims 1 to 10, characterized by the fact that a composition based on a resin curable at room temperature (RI), (R2) or (R3) further comprises, per 100 parts by weight of said resin curable at room temperature, at least one of the products among: • at least one anti-termite and insect repellent agent, such as the compound of formula (8): in particular at a rate of 10 to 30 parts by weight;

12.

13.

14. • at least one UV stabilizer chosen in particular from hindered amines, benzotriazole, benzophenone and hydroxytriazine, in particular in an amount of 0.1 to 4 parts by weight; • at least one moisture absorber, such as an aluminosilicate, in particular in an amount of 1 to 3 parts by weight; • at least one colorant, in particular in an amount of 5 to 15 parts by weight; and • at least one flame retardant filler, in particular in an amount of 0.1 to 15 parts by weight. - Floor covering, characterized by the fact that it comprises successively, starting from the layer applied to the floor: I. a sub-layer for preparing the floor to be covered; II. a grid layer resulting from the hardening at room temperature of the mixture (B) + composition based on (RI) applied in layer(s) on the floor to be covered; III. a layer of filling of the upper region of the grid layer (II), resulting from the hardening at room temperature of the mixture (P) + composition based on (R2) applied in layer(s); IV. where applicable, at least one finishing filling layer (IV), resulting from the hardening at room temperature each time of a mixture (P) + composition based on (R3) applied in layer(s), the constituents (B), (P), (RI), (R2) and (R3) and their relative proportions being as defined in one of claims 1 to 11. - Floor covering according to claim 12, characterized in that the undercoat (I) for preparing the floor to be covered is a primer layer with a thickness of 100 to 500 μm, said primer being chosen in particular from polyurethanes, epoxies and polyethers with silane terminations. - Floor covering according to one of claims 12 and 13, characterized in that the layer (II) has a thickness of 6 to 10 mm after its formation and the filling part which is formed by the layer (III) and

15.

16.

17. where appropriate, the layer(s) (IV) and at least part of which occupies the upper part of the grid layer has a total thickness of 500 to 3000 pm. - Floor covering according to one of claims 12 to 14, characterized in that the layer (III) or (IV) has received: • in the case of an exterior floor covering, for pedestrian use, a finishing layer (V) consisting of a film (Va) of varnish or paint with a thickness in particular of 100 to 500 μm or of a layer (Vb) of a resin composition whose resin has been chosen in particular from those included in the composition of the layer (III), or of a layer (Vb) as defined above on which is placed a film (Va) as defined above; and • in the case of an interior floor covering, a finishing layer such as layer (V) defined above or a finishing covering chosen from polished concrete, parquet, linoleum, tiling, textile carpet, stone carpet, poly(vinyl chloride) covering. - Floor covering according to one of claims 12 to 15, characterized in that the Shore A hardness according to ISO 868 of layer (III) is between 45 and 100, in particular between 45 and 85. - Method of manufacturing a floor covering as defined in one of claims 12 to 16, characterized in that it comprises the following successive steps: a. application of a primer undercoat (i) to the floor to be coated; b. where appropriate, leveling with a resin that hardens at room temperature such as resins (RI), (R2), (R3); c. mixing (B) and the composition based on (RI) and, on the primer undercoat once dry and having undergone leveling if necessary, spreading the mixture obtained to form the layer (II) which is allowed to dry; d. sanding the surface of layer (II) formed in step c) once it is dry; e. mixing (P) and the composition based on (R2) and, on the layer (II), spreading the mixture obtained to form a layer (III) which penetrates into the surface region of layer (II) and which is caused to dry; f. sanding the surface of the layer (III) formed in step (d) once it is dry; g. mixing (P) and the composition based on (R3), and, on the layer (III), spreading the mixture obtained to form a finishing filling layer (IV); h. sanding the surface of the layer (IV) formed in step (g) once it is dry; i. where appropriate, repeating steps (g) and (h) at least once to form an additional finishing filling layer each time; j. providing a topcoat or finishing coating as defined in claim 15.

18. - Method according to claim 17, characterized in that the drying is carried out the different layers (I) to (IV) for 24 to 48 hours at 20°C.

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