Insulating product for a building element comprising a cavity

Abstract

The present invention relates to a thermal and / or acoustic insulation product for filling a building element comprising two facing walls forming a cavity, the product comprising blown glass wool forming flakes, the product comprising a hydrophobic additive, the hydrophobic additive being a branched and cross-linked organosilicon polymer compound, a median flake size being less than 20 mm.

Description

Title of the invention: Insulating product for a building element comprising a cavity Scope of the invention

[0001] The present invention relates to the field of construction. More specifically, it relates to a thermal and / or acoustic insulation product for filling a building element. It also relates to the process for obtaining the building element. State of the art

[0002] It is known to fill cavities made in building elements, such as walls or parts of walls, with insulating materials, such as mineral wool or foams, inorganic (e.g. cement foams) or organic (e.g. polyurethane foams).

[0003] These various solutions are not without drawbacks. The filling of cavities with the insulating material is not always homogeneous, leading to the creation of thermal bridges and therefore to a degradation of thermal insulation performance. These homogeneity defects can occur over time or during the transport of building elements to the construction site, in the case of prefabricated elements. For example, mineral wool-based materials can tend to settle. Finally, the injection of the product into a cavity is carried out using a nozzle. During injection, a "clogging" phenomenon, i.e., non-linear blockage, frequently occurs in the nozzle during the injection of the product. Description of the invention

[0004] An object of the invention is to propose a solution to overcome these disadvantages and to manufacture a building element exhibiting an overall thermal conductivity lower than that of known building elements, thanks to a better homogeneity of the cavity filling.

[0005] This objective is achieved within the framework of the present invention by means of a thermal and / or acoustic insulation product for filling a building element comprising two facing walls so as to form a cavity, the product comprising blown glass wool forming flakes, - the product comprising a hydrophobic additive, the hydrophobic additive being a branched and cross-linked organosilicon polymer compound, and - a median flake size being less than 20 mm.

[0006] The present invention is advantageously complemented by the following features, taken individually or in any of their technical combinations: only possible:

[0007] - the product has a mass distribution of flakes obtained by sieving 2 g to 5 g of the insulation product using a vibrating sieve shaker comprising a stack of sieves and a maximum oscillation amplitude of 3 mm set between 1.5 mm and 3 mm, preferably between 2 mm and 3 mm and better at 2.85 mm, for 5 minutes, wherein: - a mass percentage of flakes remaining on the 25 mm sieve is less than 5% by mass, preferably less than 3% by mass and - a mass percentage of flakes remaining on the 19 mm sieve is less than 10% by mass, preferably less than 3% by mass,

[0008] - the median size of the flakes is less than 18 mm, in particular less than 15 mm, preferably between 5 mm and 20 mm and in particular between 7 mm and 18 mm,

[0009] - the median size of the flakes is less than 6 mm, in particular between 1 mm and 6 mm and preferably between 2 mm and 6 mm,

[0010] - the product has a micronaire between 4 L / min and 7 L / min, in particular between 5.5 L / min and 6.5 L / min,

[0011] - the product exhibits a loss on ignition of between 0.1% and 1.5% by mass, in particular between 0.1% and 1% by mass,

[0012] - the product includes a dust-suppressing additive, the dust-suppressing additive comprising a hydrocarbon oil,

[0013] - a mass percentage of an antistatic additive is less than 0.2%, the product being pre preferentially devoid of an antistatic additive,

[0014] - the product has a density of less than 15 kg / m3, preferably less than 13 kg / m3,

[0015] - the product exhibits an air resistance greater than 2500 Pa.s / m2, and preferably greater than 3000 Pa.s / m2.

[0016] Another aspect of the invention is a construction element comprising two walls facing each other so as to form a cavity, the cavity being filled with a product according to an embodiment of the invention.

[0017] Advantageously, the cavity is formed by the two walls, each of the two walls being a main wall, and formed by a plurality of lateral walls.

[0018] Advantageously, at least one of the two walls, preferably only one of the two walls, is formed by a membrane.

[0019] Advantageously, the membrane may comprise a polymer material and / or glass.

[0020] Advantageously, the membrane is formed from an air-permeable material, in particular impermeable to flakes, and preferably from a material having a canvas or fabric structure.

[0021] Advantageously, the membrane comprises polyethylene.

[0022] Advantageously, the cavity is formed by the two walls, each of the two walls being a lateral wall, and formed by at least one main wall.

[0023] Another aspect of the invention is a wall comprising a building element according to an embodiment of the invention.

[0024] Another aspect of the invention is a structural element comprising a construction element according to an embodiment of the invention.

[0025] Another aspect of the invention is a method for obtaining a construction element comprising two facing walls so as to provide at least one cavity filled by a product according to an embodiment of the invention, the method comprising a step a) in which a non-blown product is blown into the cavity by means of a nozzle so as to manufacture the thermal insulation product according to an embodiment of the invention.

[0026] Advantageously, one of the two walls includes a through orifice, the nozzle being arranged in the orifice.

[0027] Advantageously, in step a), the cavity is formed by the two walls, each of the two walls being a main wall, and by a plurality of lateral walls.

[0028] Advantageously, the nozzle has an internal diameter of less than 20 mm, in particular less than 15 mm.

[0029] Advantageously, in step a), the construction element comprises two walls, each of the two walls being formed by a side wall, and also comprises two main walls distinct from the two walls, and, in step a) of the process, the cavity is formed by the two side walls and by at least one main wall.

[0030] Advantageously, in step a), the construction element comprises two walls, each of the two walls being formed by a side wall, and also comprises two main walls distinct from the two walls, and, in step a) of the process, the cavity is formed by the two side walls, and by a single first main wall so that the cavity is open, the nozzle being disposed on the opposite side to the side of the first main wall with respect to the cavity.

[0031] Advantageously, in step a), the construction element comprises two walls, each of the two walls being formed by a side wall, and also comprises two main walls distinct from the two walls, and, in step a) of the process, the cavity is formed by the two walls and by at least one main wall, the process further comprising a step b) subsequent to step a), in which a second main wall is installed opposite the first main wall so as to close the cavity. Description of the figures

[0032] Other features, objectives and advantages of the invention will become apparent from the following description, which is purely illustrative and not limiting, and which should be read in conjunction with the accompanying drawings on which:

[0033] [Fig-1] - [Fig.1] schematically illustrates a construction element according to a method of embodiment of the invention,

[0034] [Fig.2] - Fig.2 illustrates a cumulative distribution of the mass proportion of dif different sizes of product flakes according to embodiments of the invention,

[0035] [Fig.3] - [Fig.3] is a photograph taken by an electron microscope at scanning of a product different from the invention,

[0036] [Fig.4] - [Fig.4] is a photograph taken by an electron microscope at scanning of a product according to an embodiment of the invention,

[0037] [Fig. 5] - [Fig. 5] illustrates the variation in the relative size of the flakes of a product according to an embodiment of the invention with the micron of the product,

[0038] [Fig.6] - [Fig.6] illustrates the variation in resistance to the passage of air of a product according to an embodiment of the invention with the density of the product,

[0039] [Fig.7] - the [Fig.7] schematically illustrates a construction element according to a embodiment of the invention for a prefabricated element,

[0040] [Fig.8] - [Fig.8] illustrates a construction element according to an embodiment of the invention for a "blow-in-blanket" type application.

[0041] Throughout the figures, similar elements bear identical references. Definitions

[0042] Air resistance is measured according to the international standard EN29053.

[0043] The term "blowing" of mineral wool means blowing as defined by the EN standard 14064-1:2007.

[0044] In this application, the fineness of mineral wool fibers is determined by their micronaire value, under 5g. The micronaire, also called the "fineness index," is representative of the specific surface area of ​​the fibers. The micronaire measurement includes a measurement of the aerodynamic pressure drop when a given quantity of fibers extracted from the product is subjected to a given pressure of a gas, generally air or nitrogen. This measurement is common in mineral fiber production units, is standardized (DIN 53941 and ASTM D 1448 standards), and uses an apparatus known as a "micronaire apparatus." The method for measuring the micronaire is also described in document WO 2003098209. Detailed description of the invention

[0045] General description of the insulation product

[0046] With reference to [Fig. 1], [Fig. 7] and [Fig. 8], one aspect of the invention is a Product 1 is a thermal and / or acoustic insulation product for filling a building element 2. The building element 2 comprises two facing walls 3 forming a cavity 4. Product 1 comprises blown glass wool in the form of flakes. The product includes a hydrophobic additive. The hydrophobic additive is a branched and cross-linked organosilicon polymer compound. The median flake size is less than 20 mm, in particular less than 18 mm and preferably less than 15 mm. Preferably, the median flake size may be between 5 mm and 20 mm and preferably between 7 mm and 18 mm.The inventors discovered that a flake size within the aforementioned ranges, in combination with the aforementioned hydrophobic additive, surprisingly allows for both a more homogeneous filling of a cavity by injection than with known insulation products, thus avoiding the formation of thermal bridges in the cavity, and also avoiding the "clogging" problems encountered when injecting known products.

[0047] Another aspect of the invention is a construction element 2 comprising a product according to an embodiment of the invention.

[0048] With reference to [Fig. 1], the cavity 4 of the construction element 2 can be formed by the two walls 3, each of the two walls 3 being a main wall 7, and formed by a plurality of side walls 8.

[0049] One of the walls of the building element may include an orifice 6. Preferably, one of the main walls 7 may include an orifice 6. Thus, it is possible to insert a nozzle 5 into the cavity 4 to blow a non-blown product in order to manufacture the product 1, thereby enabling the manufacturing of the building element 2. An internal diameter of the orifice 6 may be less than 20 mm and, in particular, less than 15 mm. In this embodiment of the invention, a median flake size may be between 5 mm and 20 mm. This range of median flake sizes makes it possible both to fill a cavity by injection more homogeneously than with known insulation products, so that it is possible to avoid the formation of thermal bridges in the cavity, and to avoid the "clogging" problems encountered when injecting known products through a nozzle.

[0050] With reference to [Fig. 7], the cavity 4 of the building element 2 can be formed by the two walls 3, each of the two walls 3 being a side wall 8, and formed by at least one main wall 7. Thus, it is possible to manufacture a prefabricated building element 2, intended, for example, for the subsequent assembly of a wall. In this embodiment of the invention, the median size of the flakes can be less than 6 mm, in particular between 1 mm and 6 mm and preferably between 2 mm and 6 mm. This range of median flake size makes it possible to fill a cavity by injection more homogeneously than with insulation products. known, so that it is possible to avoid forming thermal bridges in the cavity, and at the same time to increase the speed of injection of flakes into cavity 4 by a nozzle.

[0051] With reference to [Fig. 8], product 1 can be used for a blow-in-blanket application. At least one of the two walls 3, and preferably only one of the two walls 3, can be formed by a membrane. The wall 3 formed by a membrane can be a main wall 7. After blowing product 1 into the cavity 4, the wall 3 formed by a membrane can be covered with another, more rigid wall. The membrane can comprise a polymer material and / or glass. The membrane can be permeable to air and, preferably, impermeable to flakes of product 1. Thus, it is possible to fill the cavity with product 1 without exerting excessive stress on the membrane, which could damage the membrane due to the pressure imposed in the cavity during blowing. For this purpose, the membrane can be formed from a material having a canvas or fabric structure. The membrane can also comprise polyethylene.The cavity walls, lateral or main, may be made of at least one material chosen from wood, plaster, concrete, and a metallic material, preferably steel or aluminum. The lateral walls 8 may be made of steel. The main walls 7 may be made of wood and / or aluminum. Generally, at least one wall 3, preferably a lateral wall 8 or a main wall 7, has perforations and / or air passages. Thus, the wall 3 allows air to exit the cavity 4 selectively with regard to the blown product while lightening the structural element 2.

[0052] Measurement of flake size

[0053] The median size of glass wool flakes can be measured using the method described below. The principle of the measurement consists of vibrating a stack of sieves of different diameters and sorting the resulting flakes according to their size. A sieve is a grid of varying mesh size, used to sort flakes, fixed to a frame. The sieves are vibrated using a sieve shaker, which is a vibrating device on which the sieves are mounted. The equipment required for this measurement includes a sample of blown glass wool, a balance with a precision of ± 0.05 g, a plastic beaker of approximately 500 mL, sieves and a lower container (without holes), and an automatic sieve shaker, for example, a Retsch Sieve Shaker model RX-24. Sieves of 20 cm (8”) diameter with hole sizes defined below were used: 6 mm (0.25”), 13 mm (0.5”), 19 mm (0.75”), 25 mm (1”).A representative sample of the product is placed in a box approximately 40x40x40 cm or larger. The product must not be compressed during handling or transport. Between 3.0 and 3.5 + / - 0.1 g of [unclear]. The product is weighed in the plastic beaker. The sieves are stacked from smallest mesh (6 mm) to largest on the sieve shaker. The sample is placed on the top sieve, i.e., the one with the largest mesh. It is important that as much of the surface area as possible is covered to prevent large flakes from blocking the smaller ones from passing through. A lid is placed and tightened on the stack of sieves. The sieve shaker is run for a measurement time of 5 minutes. The resulting material on each sieve is weighed after vibration has ceased. The mass percentage is calculated by dividing the mass of material on the sieve in question by the sum of the masses of all the sieves. The vibrating sieve shaker consists of a stack of sieves and a maximum oscillation amplitude of 3 mm. The oscillation amplitude is set between 1.5 mm and 3 mm, preferably between 2 mm and 3 mm, and ideally at 2.85 mm. The vibration lasts five minutes.To obtain the desired oscillation amplitude, the sifter power is adjusted. For example, the sifter power is set to 65% when four sieves are used and between 45% and 65% when seven sieves are used to obtain the same level of vibration.

[0054] The results are expressed as mass percentages per sieve. Five measurements are taken with new samples for the same product. With reference to [Fig. 2], cumulative mass distributions are shown for two different products, each product being according to an embodiment of the invention. A median flake size for a product can be calculated from the cumulative mass distribution of the product. Curve (a) illustrates, for example, a product according to an embodiment of the invention comprising flakes having a median size of 9.25 mm, and curve (b) shows, for example, a different product according to an embodiment of the invention comprising flakes having a median size of 11.70 mm.

[0055] Table [Table 1] below describes, for example, the result of mass percentage measurements for five samples of the same product according to an embodiment of the invention, according to the method previously described.

[0056] [Tables 1] Sieve size < 6 mm [6 mm; 13 mm [ [13 mm; 19 mm [ [19 mm; 25 mm [ 25 mm Mass percentage - sample #1 12% 54% 32% 2% 0% Mass percentage - sample #2 13% 36% 51% 0% 0% Mass percentage - sample #3 14% 47% 34% 5% 1% Mass percentage - sample #4 14% 44% 43% 0% 0% Mass percentage - sample #5 0% 55% 32% 0% 0% Average mass percentages 10% 47% 38% 2% 0%

[0057] Product 1 may have a mass distribution of flakes, obtained by sieving 2 g to 5 g of the insulation product, using a vibrating sieve shaker comprising a stack of sieves and a maximum oscillation amplitude of 3 mm set between 1.5 mm and 3 mm, preferably between 2 mm and 3 mm and better at 2.85 mm, for five minutes, wherein: - a mass percentage of flakes remaining on the 25 mm sieve is strictly less than 5% by mass, preferably strictly less than 3% by mass and - a mass percentage of flakes remaining on the 19 mm sieve of less than 10% by mass, preferably less than 3% by mass.

[0058] Micronaire of the insulation product

[0059] The product can have a micronaire flow rate between 4 L / min and 7 L / min, particularly between 5.5 L / min and 6.5 L / min. It has been measured that a decrease in the micronaire of product 1 within the aforementioned range makes it possible to obtain a flake size within the aforementioned range while also increasing the homogeneity of product 1 installed in cavity 4 compared to a known product installed in the same cavity. Referring to [Fig. 5], the relative size of the flakes decreases with a decrease in the micronaire of the product.

[0060] Resistance to air passage & density of blown product 1

[0061] With reference to [Fig. 6], the product may exhibit an air resistance greater than 2500 Pa.s / m², in particular greater than 3000 Pa.s / m² and preferably greater than 3500 Pa.s / m2. Product 1 may have a density of less than 15 kg / m3 and preferably less than 13 kg / m3.

[0062] Hydrophobic additive

[0063] The hydrophobic additive is a branched and cross-linked organosilicon polymer compound. It is known to use a hydrophobic additive comprising an organosilicon polymer compound. Such an additive makes it possible to impart hydrophobicity to an installed product in such a way as to prevent water infiltration into the product from altering its homogeneity. However, known hydrophobic additives are not necessarily compatible with the desired flake size and do not prevent clogging in the nozzle during product installation.The inventors discovered that a flake size within the aforementioned range, in combination with the hydrophobic additive comprising a branched and cross-linked organosilicon polymer compound, surprisingly allowed both a more homogeneous filling of a cavity by injection than with known insulation products, thus avoiding the formation of thermal bridges in the cavity, and also avoiding the "clogging" problems encountered when injecting the product through a nozzle.

[0064] Figure 3 illustrates a scanning electron microscope photograph of a product other than a product according to an embodiment of the invention, comprising a hydrophobic additive, the hydrophobic additive comprising a reactive linear silicone. The scale bar corresponds to a length of 1 pm. Figure 4 illustrates a scanning electron microscope photograph of a product according to an embodiment of the invention, comprising a hydrophobic additive, the hydrophobic additive comprising a branched and cross-linked organosilicon polymer. The scale bar corresponds to a length of 4 pm.

[0065] The product may be free of a hardener suitable for polymerizing the polymer compound. Thus, it is possible to simplify the manufacturing process by using the heat emitted by the glass wool after its production to crosslink the hydrophobic additive. Commercial products such as SILRES (registered trademark) BS5160 produced by Wacker (registered trademark) or BRB BW5 produced by Siloen (registered trademark) comprise branched and crosslinkable organosilicon polymer compounds suitable for manufacturing a product 1.

[0066] Dust suppressant additive

[0067] Product 1 may include a dust suppressant additive. A dust suppressant additive is known to limit dust emissions from product 1 during blowing, thereby increasing the installer's comfort during application. Product 1 may include a dust suppressant additive comprising a hydrocarbon oil. This makes it possible to limit or prevent cyclosiloxane emissions, which are possible when using known dust suppressant additives containing chains. of the Si-O type. The inventors discovered that a dust-suppressing additive comprising a hydrocarbon oil was compatible with the injection of the product through a nozzle into a cavity 4 without causing the nozzle to clog. The hydrocarbon oil can be a commercially available oil such as Finavestan A 100B, marketed by Total (registered trademark).

[0068] Antistatic additive

[0069] The mass percentage of antistatic additive in product 1 may be less than 0.2%. Product 1 may be free of an antistatic additive, in particular an antistatic additive other than the organosilicon compound, the organosilicon compound not being an antistatic additive. Thus, the resistance to airflow may be increased compared to the same product containing an antistatic additive. With reference to [Fig. 6], point (c) illustrates a product 1 free of an antistatic additive other than the organosilicon compound and point (d) illustrates the same product containing an antistatic compound other than the organosilicon compound, of the "Momar" type.

[0070] Loss in fire

[0071] The loss on ignition of the product can be between 0.1% and 1.5%, in particular between 0.1% and 1% by mass. Loss on ignition is understood to be the difference in mass between the mass of the product 1 before calcination and after calcination, expressed as a percentage of the mass of the product before calcination. Thus, it is possible to maximize the thermal insulation of the blown product while avoiding the aforementioned drawbacks of the prior art. To this end, the mass percentage of the organosilicon compound can be adjusted so that the loss on ignition of the product is between 0.1% and 1.5%, and in particular between 0.1% and 1% by mass.

[0072] Manufacturing of the insulation product

[0073] Glass fiberization can be carried out by the TEL process, as described in patent EP 0 091 866. A fiberization device for glass comprises a spinning plate and a basket. A stream of molten glass is poured into the shaft of a hollow shaft. The molten glass is received at the bottom of a basket. The rotation of the basket directs the molten glass onto the peripheral part of the basket, which is perforated by a plurality of orifices. Under the effect of centrifugation, the material is projected onto an inner face of a peripheral wall of the centrifuge, which also has a plurality of orifices. The material passes through these orifices and is projected in the form of filaments outside the centrifuge. An annular burner, arranged near the orifices, emits a gas jet that stretches the filaments and thus forms the glass fibers.The burner is configured so that the temperature of the gas jet at the burner outlet is between 1300°C and 1500°C, preferably around 1400°C. The variation in burner pressure, driving the gas jet, allows control of the fiber fineness.

[0074] The fiber yield per orifice of a plate per day is equal to the flow rate of molten raw material passing through each orifice per day. The fiber yield per orifice of a plate per day can be between 0.30 kg / day and 0.8 kg / day, in particular between 0.4 kg / day and 0.7 kg / day.

[0075] The plate of the centrifugation device may comprise at least 30,000 orifices, for example when the diameter of the plate is equal to 600 mm. Preferably, the plate of the centrifugation device may comprise at least 36,000 orifices, for example when the diameter of the plate is equal to 400 mm.

[0076] The plate of the centrifugation device has a diameter between 50 mm and 800 mm, and preferably between 400 mm and 600 mm. The stroke of the centrifugation device 2 varies with the diameter of the plate.

[0077] The orifices are formed and distributed along the drilling strip of the plate. The height of the drilling strip, along the direction of the rotation axis X of the centrifugal device, is preferably less than 35 mm. The diameter of the orifices is between 0.5 and 1.1 mm.

[0078] The distance between the centers of adjacent orifices can be between 0.8 mm and 2 mm. This distance can vary by less than 10%, and preferably by less than 3%. The distance between the centers of adjacent orifices can decrease in a direction oriented towards the lower part of the plate.

[0079] The manufacturing process may then include a step of recovering the mineral fibers on a conveyor belt. Following the recovery step, the manufacturing process may include a fiber grinding step. The fiber grinding step allows for control of the flake size. The fiber grinding step includes passing the fibers through a knife mill and then preferably through a screen selector. It is possible to select the screen size to obtain a flake size within the product range, all other parameters being constant.

[0080] The manufacturing process of the product then includes a step of blowing the product obtained previously, implemented by blowing the product obtained previously into the cavity 4 by means of a nozzle 5 so as to manufacture the thermal insulation product 1.

[0081] Another aspect of the invention is a method for obtaining a construction element 2 according to an embodiment of the invention. The method comprises a step a) in which a non-blown product is blown into the cavity 4 by means of a nozzle 5 so as to manufacture the thermal insulation product 1.

[0082] With reference to [Fig. 1] and [Fig. 8], one of the two walls 3 may include an orifice 6 passing through the wall. The nozzle 5 is then arranged in the orifice 6 during blowing. It may be arranged partially in the orifice or entirely so as to reach the cavity. When one of the walls 3 is formed by a membrane, the orifice 6 This can be formed by piercing the membrane with nozzle 5. After blowing the product 1 into cavity 4, the orifice 6 can be closed by applying an adhesive film to both the orifice 6 and the membrane. Nozzle 5 can have an internal diameter of less than 20 mm, particularly 15 mm. Therefore, it is not necessary to open the wall over too large an area to inject the unblown product. In step a) of the process, cavity 4 is formed by the two walls 3, each of which is a main wall 7, and by a plurality of side walls 8.

[0083] With reference to [Fig. 7], the construction element 2 obtained by the process may comprise two walls 3, each of the two walls 3 being formed by a side wall 8, and may also comprise two main walls 7 distinct from the two walls 3. In step a), the cavity 4 is formed by the two walls 3 and by at least one main wall 7, and preferably formed by the two walls 3 and by a single main wall 7. The nozzle 5 may be arranged on the side opposite the side of the first main wall 7 with respect to the cavity 4. Preferably, a plurality of nozzles, for example between 3 and 6 nozzles, are arranged on the side opposite the side of the first main wall 7 with respect to the cavity 4. Thus, it is possible to fill the cavity 4 to obtain a prefabricated construction element 2.Product 1 can be conveyed into cavity 4 by means of a device comprising a resting wall in which orifices are formed, each end of a nozzle being fixed to an orifice. Such a device is known as a "fiat iron." The resting wall is installed over cavity 4 so as to close it off. The resting wall may include a semi-permeable membrane, adapted to allow air to pass through it and to retain the blown wool flakes. Thus, it is possible to inject product 1 into cavity 4 while controlling its density.

[0084] The process may include a step b), subsequent to step a), in which a second main wall 7 is installed opposite the first main wall 7 so as to close the cavity 4. Thus, it is possible to obtain a prefabricated building element 2.

Claims

Demands

1. Thermal and / or acoustic insulation product (1) for filling a building element (2) comprising two facing walls (3) forming a cavity (4), product (1) comprising blown glass wool in the form of flakes, product (1) being characterized in that: - product (1) comprises a hydrophobic additive, the hydrophobic additive being a branched and cross-linked organosilicon polymer compound, and - a median flake size of less than 20 mm.

2. Product (1) according to claim 1 wherein the median size of the flakes is between 5 mm and 20 mm and in particular between 7 mm and 18 mm.

3. Product (1) according to any one of claims 1 to 2, having a mid-cycle between 4 L / min and 7 L / min.

4. Product (1) according to any one of claims 1 to 3, having a loss on ignition of between 0.1% and 1.5% by mass.

5. Product (1) according to any one of claims 1 to 4, comprising a dust suppressant additive, the dust suppressant additive comprising a hydrocarbon oil.

6. Product (1) according to any one of claims 1 to 5, wherein a mass percentage of an antistatic additive is less than 0.2%, the product preferably being devoid of an antistatic additive.

7. Product (1) according to any one of claims 1 to 6, having a density of less than 15 kg / m3, preferably less than 13 kg / m3.

8. Product (1) according to any one of claims 1 to 7, having a resistance to air passage greater than 2500 Pa.s / m2, and preferably greater than 3000 Pa.s / m2.

9. Construction element (2) comprising two walls (3) facing each other so as to form a cavity (4), the cavity (4) being filled by a product (1) according to any one of claims 1 to 8.

10. Construction element (2) according to claim 9, wherein the cavity (4) is formed by the two walls (3), each of the two walls (3) being a main wall (7), and formed by a plurality of side walls (8).

11. Construction element (2) according to claim 9 or 10, wherein only one of the two walls (3) is formed by a membrane.

12. Construction element (2) according to claim 9, wherein the cavity (4) is formed by the two walls (3), each of the two walls (3) being a side wall (8), and formed by at least one main wall (7).

13. Wall comprising a building element according to any one of claims 9 to 12.

14. A method for obtaining a building element (2) comprising two walls (3) facing each other so as to provide at least one cavity (4) filled by a product (1) according to any one of claims 1 to 8, the method comprising a step a) in which a non-blown product is blown into the cavity (4) by means of a nozzle (5) so as to manufacture the thermal insulation product 1.

15. Method according to the preceding claim, wherein one of the two walls (3) comprises a through orifice (6), the nozzle (5) being arranged in the orifice (6).

16. A method according to claim 14 or 15, wherein, in step a), the cavity (4) is formed by the two walls (3), each of the two walls (3) being a main wall (7), and by a plurality of side walls (8).

17. A method according to any one of claims 14 to 16, wherein the nozzle (6) has an internal diameter of less than 20 mm, in particular less than 15 mm.

18. Method according to claim 14, the construction element (2) comprising two walls (3), each of the two walls (3) being formed by a side wall (8), and also comprising two main walls (7) distinct from the two walls (3), in which, at step a), the cavity (4) is formed by the two side walls (3) and by at least one main wall (7).

19. Method according to the preceding claim, wherein, in step a), the cavity (4) is formed by the two walls (3), and by a single first main wall (7) so that the cavity (4) is open, and the nozzle (5) is disposed on the side opposite to the side of the first main wall (7) with respect to the cavity (4).

20. A method according to the preceding claim, further comprising a step b) subsequent to step a), in which a second main wall (7) is installed opposite the first main wall (7) so as to close the cavity (4).

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