FORMULATION FOR AN ACOUSTIC FLOOR COVERING, FOR INTERIOR OR EXTERIOR FLOOR COVERING, INCLUDING 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 MAKING 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 that hardens 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; and a composition based on a resin that hardens 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 the production of a floor covering, an interior or exterior floor covering consisting of or comprising this acoustic covering, and a method for producing this floor covering.

[0002] French patent application 2,439,855 discloses a floor covering consisting of an elastic material underlayer coated with a relatively hard surface layer, both layers being poured in place, the coating layer being sanded after drying. The underlayer is made from rubber granules embedded in a prepolymer of the polyurethane family. The surface layer consists of a two-component polyether-polyester / aromatic isocyanate coating. The floor covering is manufactured as follows: • to apply rubber granules coated with a prepolymer to the ground and allow it to polymerize; • to apply a coating to the upper surface of the undercoat, said coating hardening by the reaction of N=C=O groups with -OH groups; and • to sand the top 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 solve this problem by proposing a flexible floor covering, while maintaining, 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 flooring formulation is proposed comprising a flexible acoustic mesh layer made of cereal husk embedded in a resin and 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 husk from so-called hulled cereals, which is a waste that the invention makes it possible to recycle.

[0007] Furthermore, an acoustic characteristic is provided by the fact that air spaces are formed between the fragments that make up the cereal hull and which are coated with resin in the part of the coating called "grid" as indicated below.

[0008] The present invention therefore relates firstly to a formulation for a floor covering, characterized in that it comprises: • for the formation of a layer called a grid (II) on the floor to be coated: • at least one grain bale (B); and • a composition based on a resin that hardens 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 filler layer (III) on the grid layer (II): • powder (P) from at least one grain hull; and • a composition based on a resin that hardens 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 include: • for the formation of at least one finishing filler layer (IV): • of the powder (P) as defined above; and • a composition based on a resin that hardens 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) means a resin that can be cured at a temperature of 10 to 35°C.

[0014] The cereal hulls comprising (B) and (P) can be independently selected from rice, einkorn, millet, rye, buckwheat, oat, wheat, emmer, and sorghum hulls and mixtures thereof, the largest dimension of a cereal hull (B) being in particular 1 to 15 mm, and the average particle size of the cereal hull powder (P) being in particular 50 to 500 µm. The average particle size of the powder (P) corresponds to a particle size analysis by Mastersizer 2000.

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

[0016] In particular: • a silane-terminated polyether 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 an alkyl radical, linear or branched, in Ci-C6; • R6, R'6 each represent a divalent alkylene radical, linear or branched, in CrC6; • R7, R'7 each represent a linear or branched alkylene divalent radical, in C2-C4; • R8, R'8 each represent a C5-Ci5 hydrocarbon radical, aromatic or aliphatic, linear, branched or cyclic; • R9, R'9 each represent hydrogen, phenyl, linear alkyl, branched or cyclic in Ci-C6 or a 2-succinate radical of formula R13—O(O)C—CH2—CH—C(O)O—R13 'I

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

[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] 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.

[0022] The polysiloxane can 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—Si— 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 silane-terminated polyether, optionally in combination with a polysiloxane, may contain at least one aminosilane co-crosslinking agent selected in particular from silanes of formula (1):

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

[0027] in which: - R1 and R2 each represent hydrogen, linear alkyl in Ci-C6, branched in C2-C8 or cyclic in C6-Ci8; amino-alkyl in CrCi2; - R3 represents CrCi8 alkylene; - R4 and R5, whether identical or different, are each an alkyl radical, linear or branched, in Ci-C6; - q is equal to 0, 1 or 2, being in particular 0 or 1, and

[0028] in particular among: aminopropyltrimethoxysilane, aminopropyltriethoxysilane, raminopropylmethyldimethoxysilane, aminopropylmethyldiethoxysilane, N-

[0029]

[0030]

[0031]

[0032]

[0033] (2-aminoethyl)aminopropyltrimethoxysilane, the N- (2-aminoethyl)aminopropyltriethoxysilane, the N- (2-aminoethyl)aminopropyltrimethyldimethoxysilane, cyclohexylaminomethyltriethoxysilane, cyclohexylaminomethylethoxysilane, N- cyclohexylaminomethyltrimethoxysilane and the N- cyclohexylaminomethylmethyldimethoxysilane. The composition based on a silane-terminated polyether in combination with a polysiloxane may include: A. 15 to 65 parts by weight, preferably 25 to 60 parts by weight, of said or said silane-terminated polyethers; B. 85 to 35 parts by weight, preferably 75 to 40 parts by weight, of said polysiloxane or polysiloxane; C. 1 to 8 parts by weight, preferably 2 to 6 parts by weight of said aminosilane co-crosslinking agent(s), the quantity of (A)+(B) representing 100 parts by weight and the quantity of (C) being given for 100 parts by weight of (A)+(B). A polyurethane can 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 that is inert with respect to isocyanate groups, and the polyether aspartic 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 alkyl in Ci-C6; R23 and R24 each independently represent an organic group that is inert with respect to 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 remainder; • R26 independently represents alkyl in Ci-C6; • R27 and R28 each independently represent an organic group which is inert towards isocyanate groups. A composition based on a room-temperature curable resin (RI), (R2) or (R3) may further comprise, per 100 parts by weight of said room-temperature curable resin, at least one of the following: • at least one termite and insect repellent agent, such as the compound in formula (8):

[0038] in particular at a rate of 10 to 30 parts by weight; at least one UV stabilizer chosen in particular from among the sterically hindered amines, benzotriazole, benzophenone and hydroxytriazine, in particular at a rate of 0.1 to 4 parts by weight; at least one moisture absorber, such as an aluminosilicate, in particular at a rate of 1 to 3 parts by weight; at least one colorant, in particular at a concentration of 5 to 15 parts by weight; and • at least one flame-retardant charge, in particular at a rate 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. 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 coated; III. a filling layer 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 filler 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 underlayer (I) for preparing the floor to be coated can be a primer layer with a thickness of 100 to 500 pm, said primer being chosen in particular from polyurethanes, epoxies and silane-terminated polyethers.

[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 applicable the layer(s) (IV) and of which at least a part occupies the upper part of the grid layer has in particular a total thickness of 500 to 3000 pm.

[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 of, in particular, 100 to 500 µm, or a layer (Vb) of a resin composition, the resin of which has been chosen, in particular, from among those used in the composition of layer (III), or 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 coating chosen from waxed concrete, parquet, linoleum, tiles, textile carpet, stone carpet, poly(vinyl chloride) coating.

[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 for manufacturing a floor covering as defined above, characterized in that it comprises the following steps: following cessives: a. application of a primer undercoat (I) to the ground to be coated; b. where appropriate, leveling with a resin that hardens at room temperature such as resins (RI), (R2), (R3); c. mixing of (B) and the composition based on (RI) and, on the primer undercoat once dry and having undergone leveling where appropriate, spreading of the mixture obtained to form layer (II) which is allowed to dry; d. sanding the surface of layer (II) formed in step c) once it is dry; e. mixing of (P) and the composition based on (R2) and, on layer (II), spreading the resulting mixture to form a layer (III) which penetrates the surface region of layer (II) and is allowed to dry; f. sanding the surface of layer (III) formed in step (d) once it is dry; g. mixture of (P) and the composition based on (R3), and, on the layer (III), spreading of the mixture obtained to form a finishing filler layer (IV); h. sanding the surface of the layer (IV) formed in step (g) once it is dry; i. where appropriate, repeat steps (g) and (h) at least once to form an additional finishing filler layer each time; j. application of a finishing layer or a 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 the scope.

[0048] In these Examples: • The constituents labeled GENIOSIL® are those marketed by 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, of 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-crosslinking agent

[0052] GENIOSIL® T: UV stabilizer and moisture absorber • The constituents labeled DESMODUR® and DESMOPHEN® are those marketed by COVESTRO 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 co-reagent for polyisocyanates

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

[0057] DESMODUR® ULTRA N 3900: aliphatic trimer based on HDI, 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 CARDOLITE EUROPE

[0059] RAL 7030 colour base: colour marketed by HOLLAND COLORS

[0060] TEGO® AIREX 900: organo-modified polysiloxane defoamer containing fumed silica marketed by EVONIK

[0061] TEGO® AIREX 944: debubbler marketed by EVONIK

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

[0063] Fig. 1 of the attached drawing schematically illustrates the formation of an acoustic floor covering according to the present invention, showing four partial vertical cross-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 description above.

[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 filler 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 consisting of the resin composition RI from Table 1 at a rate of 200g of Rl / m2. They were left to harden for 4-5 hours.

[0072] Rice hulls measuring 6.5 to 8.5 mm and the RI resin composition were added to a vertical shaft mixer and mixed until the rice hulls were completely and homogeneously coated with the resin composition. Seven kilograms of RI resin were used for every three kilograms of rice hulls. The mixture was applied using a manual trowel of the "Flemish" type over the hardened primer undercoats at a rate of 5 kg of the mixture per square meter.

[0073] The trowel was regularly cleaned with a propylene carbonate type thinner to facilitate the spreading and compaction of the rice hull coated with the RI resin composition. The setting time at 20°C of the RI resin composition / rice hull mixture was 4-5 hours. Step d)

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

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

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

[0077] It was applied at a rate of 2 kg / m² to the previously cured grid layer (II), using a circular back-and-forth motion and a squeegee. The squeegee was held at the most angled possible so that the mixture penetrated the grid to a depth of 1 to 4 mm, depending on the grid's "tightness." "Tightness" refers to the size of the air spaces within 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 filler layer (III) thus formed was then sanded using an abrasive disc of 120 and then 180, and dust removed. Steps g), h) and j)

[0080] The rice hull powder and the R2 resin composition from Table 1 were again thoroughly mixed to form a mixture in the weight proportions of R2 resin:micronized rice hull powder 100:30, which was applied to the previously formed hardened filler layer (III) in the same way, at a rate of 0.350 g / m2. It was allowed to harden for 24-48h at 20°C.

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

[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 hull with spelt hulls.

[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 Color base RAL 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 consisting of the resin composition RI from Table 2 at a rate of 200g of Rl / m2. They were left to harden for 4-5 hours.

[0090] Einkorn husks measuring 8 to 15 mm and the RI resin composition were added to a vertical shaft mixer and mixed until the einkorn husks were completely and homogeneously coated with the resin composition. Seven kilograms of RI resin were used for every three kilograms of einkorn husks. The mixture was applied using a manual trowel of the "Flemish" type over the hardened primer undercoats at a rate of 5 kg of the mixture per square meter.

[0091] The trowel was regularly cleaned with a propylene carbonate-type thinner to facilitate the spreading and compaction of the einkorn hull coated with the RI resin composition. The setting time at 20°C of the RI resin composition / einkorn hull mixture is 4-5 hours. Step d)

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

[0093] Micronized einkorn hull powder (0-300 pm) and the R2 resin composition from Table 2 were carefully mixed for 2 to 3 minutes to form a plugging mixture in the weight proportions of R2 resin:einkorn hull 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 to the previously hardened grid layer (II), in a circular back-and-forth motion, using a squeegee. The squeegee was held at the most angled possible so that the mixture penetrated the grid to a depth of 1 to 4 mm depending on the "tightness" of the grid.

[0096] We allowed it to harden for 24-48 hours at 20°C.

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

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

[0099] The surface of the filler layer (IV) was then sanded the finish was obtained using an abrasive disc of 120 then 180, then by applying with a medium-pile roller at a rate of 150 g / m2 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. Demands - Formulation for a floor covering, characterized by the fact that it comprises: • for the formation of a layer called a grid (II) on the floor to be coated: • at least one grain bale (B); and • a composition based on a room temperature curable resin (RI), (B) representing 15 to 50 parts by weight per 100 parts by weight of the composition (RI); • for the formation of a filler layer (III) on the grid layer (II): • powder (P) from at least one cereal hull; and • a composition based on a resin that cures 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 filler layer (IV): • of the powder (P) as defined in claim 1; and • a composition based on a hardenable resin (R3), (P) representing 15 to 50 parts by weight per 100 parts by weight of the composition(R3). - Formulation according to any one of claims 1 and 2, characterized in that the cereal hulls composing (B) and (P) are independently selected from the hulls of rice, einkorn, millet, rye, buckwheat, oats, wheat, emmer wheat and sorghum and mixtures thereof, the largest dimension of a cereal hull (B) being in particular from 1 to 15 mm, and the average dimension of the powder (P) of cereal husks being notably from 50 to 500 pm.

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

5. - Formulation according to claim 4, characterized in that: • a silane-terminated polyether 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 an alkyl radical, linear or branched, in Ci-C6; • R6, R'6 each represent a divalent alkylene radical, linear or branched, in Ci-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 Ci-C6 or a 2-succinate radical of formula Ri 3_O(O)C—CH2—CH—C(O)O—R13 ' R13 being an alkyl radical, linear or branched, in Ci-C6; • nb n2, n3 are unnuanced integers; • mi is zero or a non-zero integer; • ni and mb n2 and m2, and n3 are such that the molecular mass the average weight 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) 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.

6. - Formulation according to one of claims 4 and 5, characterized by the The fact is 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 any one of claims 4 to 6, characterized by the the fact that the composition based on a silane-terminated polyether, possibly in combination with a polysiloxane, contains at least one aminosilane co-crosslinking agent chosen in particular from silanes of formula (1): (R1)(R2)N-R3-SiR43 q(OR5)q(1) in which: - R1 and R2 each represent hydrogen, linear alkyl in Ci-C6, branched in C2-C8 or cyclic in C6-Ci8; amino-alkyl in C1-C12; - R3 represents CrCi8 alkylene; - R4 and R5, whether identical or different, are each an alkyl radical, linear or branched, in Ci-C6; - q is equal to 0, 1 or 2, being in particular 0 or 1, and including, in particular: aminopropyltrimethoxysilane, aminopropyltriethoxysilane, aminopropylmethyldimethoxysilane, aminopropylmethyldiethoxysilane, N-(2-aminoethyl)aminopropyltrimethoxysilane, N-(2-aminoethyl)aminopropyltriethoxysilane, N-(2-aminoethyl)aminopropyltrimethyldimethoxysilane, cyclohexylami-nomethyltriethoxysilane, cyclohexylaminomethylethoxysilane, N-cyclohexylaminomethyltrimethoxysilane and N-cyclohexylaminomethyldimethoxysilane.

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

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

10. - Formulation according to any one of claims 4 to 9, characterized by the the fact that, for the formation of a polyurea, • The polyaspartic ester component is represented by 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 compound that is inert with respect to isocyanate groups, and • The polyether aspartic 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 alkyl in Ci-C6; R23 and R24 each independently represent an organic group that is inert with respect to 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 remainder; • R26 independently represents alkyl in Ci-C6; • R27 and R28 each independently represent a group organic that is inert with respect to isocyanate groups.

11. - Formulation according to any one of claims 1 to 10, characterized by the that a composition based on a room-temperature curable resin (RI), (R2) or (R3) also comprises, per 100 parts by weight of said room-temperature curable resin, at least one of the following products: • at least one termite and insect repellent agent, such as the compound in 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 among the hindered amines, benzotriazole, benzophenone and hydroxytriazine, in particular at a rate of 0.1 to 4 parts by weight; • at least one moisture absorber, such as an aluminosilicate, in particular at a rate of 1 to 3 parts by weight; • at least one colorant, in particular at a concentration of 5 to 15 parts by weight; and • at least one flame-retardant charge, in particular at a rate 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 ground: I. a sub-layer for preparing the ground 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 coated; III. a filling layer 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 filler layer (IV), resulting from the hardening at room temperature each time of a mixture (P) + composition based on (R3) applied in layer(s), constituents (B), (P), (RI), (R2) and (R3) and their relative proportions being as defined in any one of claims 1 to 11. - Floor covering according to claim 12, characterized in that the underlayer (I) for preparing the floor to be covered is a primer layer with a thickness of 100 to 500 pm, said primer being in particular chosen from polyurethanes, epoxies and silane-terminated polyethers. - Floor covering according to any one of claims 12 and 13, characterized in that layer (II) has a thickness of 6 to 10 mm after its formation and the filling portion which is formed by layer (III) and

15.

16.

17. where applicable the layer(s) (IV) and of which at least a part occupies the upper part of the grid layer has a total thickness of 500 to 3000 pm. - Floor covering according to any one of claims 12 to 14, characterized in that 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 of, in particular, 100 to 500 µm, or a layer (Vb) of a resin composition, the resin of which has been chosen, in particular, from among those used in the composition of layer (III), or 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 coating chosen from waxed concrete, parquet, linoleum, tiles, textile carpet, stone carpet, poly(vinyl chloride) coating. - Floor covering according to any 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. - A method for manufacturing a floor covering as defined in any one of claims 12 to 16, characterized in that it comprises the following successive steps: a. application on the ground to be coated of a primer undercoat (i); b. where appropriate, leveling with a resin that hardens at room temperature such as resins (RI), (R2), (R3); c. mixing of (B) and the composition based on (RI) and, on the primer undercoat once dry and having undergone leveling where appropriate, spreading of the mixture obtained to form 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 layer (II), spreading the resulting mixture to form a layer (III) which penetrates the surface region of layer (II) and which is allowed to dry; f. sanding the surface of layer (III) formed in step (d) once it is dry; g. mixture of (P) and the composition based on (R3), and, on the layer (III), spreading of the mixture obtained to form a finishing filler layer (IV); h. sanding the surface of the layer (IV) formed in step (g) once it is dry; i. where appropriate, repeat steps (g) and (h) at least once to form an additional finishing filler layer each time; j. production of a finishing layer or a finishing coating as defined in claim 15.

18. - A method according to claim 17, characterized in that one dries the different layers (I) to (IV) for 24 to 48 hours at 20°C.

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