PRODUCT INCLUDING MINERAL WOOL TO BLOW IN

Abstract

The present invention relates to a thermal and / or acoustic insulation product comprising loose mineral wool, the mineral wool comprising mineral fibres and being suitable for being blown, and wherein the product comprises at least one additive, the product having a mass content of the total of the additive(s) of between 0.4% and 1.2% inclusive, and the product having a micronaire of between 4 L / min and 9 L / min. Figure for abstract: Fig. 1

Description

Title of the invention: PRODUCT COMPRISING A MINERAL WOOL TO BE BLOWED FIELD OF THE INVENTION

[0001] The present invention relates to a thermal and / or acoustic insulation product comprising a blown mineral wool, preferably a glass wool, as well as a coating obtained by blowing such a product. STATE OF THE ART

[0002] It is known to thermally and / or acoustically insulate a wall of a building, for example a wall, a floor or a floor, by depositing blown glass wool in contact with the wall. A compressed glass wool in a bag undergoes a first expansion when the bag is opened. The glass wool is then introduced into a device configured to blow the glass wool, comprising for example a carding machine, in which the glass wool is subjected to a second expansion. The glass wool is then transported from the carding machine to the wall to be insulated in a pneumatic conduit. This method makes it possible to cover a wall having an irregular morphology with glass wool. This method also makes it possible to reduce the volume of the glass wool between its production and its use.

[0003] However, when depositing the glass wool on the wall, a significant portion of the glass wool may be dispersed into the ambient atmosphere. The portion dispersed into the atmosphere is referred to as glass wool “dust”. This dust presents a user comfort problem when blowing the glass wool.

[0004] It is known to reduce the amount of dust emitted when blowing glass wool and thus to increase user comfort by adding mineral oil to the glass wool.

[0005] However, the addition of mineral oil to the glass wool results in an increase in the thermal conductivity X of the blown glass wool, which decreases the thermal and / or acoustic performance of the blown glass wool.

[0006] To this end, document US 2017 0198472 describes a glass wool in which the mass content of mineral oil has been reduced with respect to the prior art. The mass content of mineral oil in the mineral wool described in document US 2017 0198472 is between 0.1% and 0.6% of the total mass of the mineral wool.

[0007] However, the glass wool described by document US 2017 0198472 has a high thermal conductivity for a predetermined density of glass wool installed on a wall. In addition, the glass wool described causes a significant amount of dust dispersed into the ambient atmosphere when it is blown. Thus, there is a need to produce glass wool with both low thermal conductivity for a predetermined installed glass wool density and high user installation comfort. Statement of the invention

[0008] An aim of the invention is to propose a thermal and / or acoustic insulation product having a thermal conductivity less than or equal to the thermal conductivities of known mineral wools, while minimizing the quantity of dust emitted during installation of the product by a user.

[0009] This aim is achieved within the framework of the present invention by means of a thermal and / or acoustic insulation product comprising a loose mineral wool, the mineral wool comprising mineral fibres and being suitable for being blown, - the product comprising at least one additive, the product having a mass content of the totality of the additive(s) of between 0.4% and 1.2% inclusive, in particular of between 0.6% and 1% inclusive and preferably of between 0.7 and 0.9% inclusive, - the product has a micronaire of between 4 L / min and 9 L / min, in particular between 5 L / min and 8 L / min and preferably between 6 L / min and 7.5 L / min.

[0010] The present invention is advantageously supplemented by the following characteristics, taken individually or in any of their technically possible combinations: - a volume-weighted median diameter of the fibers is between 5 pm and 15 pm inclusive, in particular between 6 pm and 12 pm inclusive, and preferably between 7 pm and 10 pm inclusive, and more preferably between 8 pm and 9 pm inclusive, - the fibers have a distribution of a population of fiber lengths such that the ratio between the fiber length equal to the 90th percentile in number of the distribution and between the median fiber length in number of the distribution is greater than 3, in particular greater than 4, and preferably greater than 5, - the fiber length equal to the 90th percentile in number of the distribution is strictly greater than 1 mm, in particular strictly greater than 1.5 mm and preferably strictly greater than 2.0 mm, - the median fiber length in number of the distribution is less than or equal to 2 mm, in particular less than 1 mm and preferably between 300 pm and 700 pm, - mineral wool is glass wool, the product preferably having a density between 100 kg.m3 and 180 kg.m3 inclusive, in particular between 140 kg.m3 and 160 kg.m3 inclusive, - the additive(s) comprise at least one additive chosen from an anti-dust additive, a hydrophobic additive, an antistatic additive and a colorant, - the additive(s) comprise an antistatic additive, a mass rate of the antistatic additive being between 0.01% and 0.30% inclusive, in particular between 0.02% and 0.20% inclusive, and preferably between 0.05% and 0.15% inclusive, - which the additive(s) comprise an antistatic additive, and the antistatic additive is selected from a tertiary ammonium, a quaternary ammonium, and a polyethylene glycol, - the additive(s) comprise a hydrophobic additive, a mass rate of the hydrophobic additive being between 0.05% and 0.4% inclusive, - an average length of fibers in number of fibers is between 0.5 mm and 1.5 mm inclusive, - the product is capable of presenting, after being blown, a thermal performance factor / between 0.45 W.kg.K '.m4 and 0.8 W.kg.K '.m^and in particular between 0.5 W.kg.K '.m4 and 0.75 W.kg.K '.m4,

[0011] - the product is capable of presenting, after having been blown, a density blown between 5 kg / m3 and 18 kg / m3 inclusive, in particular between 7 kg / m3 and 12 kg / m3 inclusive and preferably between 8.5 kg / m3 and 11 kg / m3 inclusive, - all of the additive(s) form deposits sprayed on the fibers, preferably a layer sprayed on the fibers, preferably by liquid means.

[0012] Another aspect of the invention is a thermal and / or acoustic insulation coating obtained by blowing a product according to an embodiment of the invention.

[0013] The coating advantageously has a thermal performance factor / of between 0.45 W.kg.K '.m4 and 0.8 W.kg.K '.m^ and in particular between 0.5 W.kg.K1 ,m4 and 0.75 W.kg.K'.m4.

[0014] The coating advantageously has a density of between 5 kg / m3 and 18 kg / m3 inclusive, in particular between 7 kg / m3 and 12 kg / m3 inclusive and preferably between 8.5 kg / m3 and 11 kg / m3 inclusive.

[0015] The coating advantageously has a thermal conductivity of between 35 mW.m *.K1 and 60 mW.m *.K1 inclusive, in particular of between 40 mW.m *.K1 and 55 mW.m *.K1 inclusive, and preferably of between 45 mW.m *.K1 and 52 mW.m *.K1 inclusive.

[0016] Another aspect of the invention is a method of manufacturing a product according to an embodiment of the invention, the method comprising a step of spraying all of the additive(s) onto the fibers by liquid means.

[0017] Another aspect of the invention is a use of a product an embodiment of the invention for the thermal and / or acoustic insulation of a wall of a building. DESCRIPTION OF THE FIGURES

[0018] Other characteristics, aims and advantages of the invention will emerge from the following description, which is purely illustrative and non-limiting, and which must be read in conjunction with the appended drawings in which:

[0019] [Fig.l] - [Fig.l] illustrates a distribution of a cumulative frequency of a population of fiber lengths of a product according to an embodiment of the invention.

[0020] [Fig.2] - [Fig.2] schematically illustrates a production facility for a insulating product according to one embodiment of the invention,

[0021] [Fig.3] - [Fig.3] illustrates the average integrated charge of the mineral fibers of a product according to an embodiment of the invention, blown.

[0022] Throughout the figures, similar elements bear identical references. DEFINITIONS

[0023] The term "thermal performance factor / " means the product of the thermal conductivity X, expressed in Wm *.K *, and the density q of a product according to an embodiment of the blown invention, expressed in kg / m3. The thermal performance factor / is, in a known manner, representative of the quantity of mineral wool to be blown to obtain a predetermined thermal resistance R on a wall. Indeed, considering a surface S to be insulated by a covering of mass m and volume V, the thermal performance factor / is equal to the ratio between, on the one hand, the mass m and between, on the other hand, the product of the thermal resistance R and the surface S. Thus, the thermal performance of the mineral wool can be determined by the product of the predetermined thermal resistance R and the thermal performance factor y.

[0024] “Blowing” of mineral wool means blowing defined by standard EN 14064-1:2007, and preferably defined by the document “Cahier Technique 8, Confection des exemples d’essais pour les produits en vrac, Index de révision C, date of implementation: 01 / 07 / 2019, ACERMI”, referring to annex C.2.1 of standard EN 14064-1:2007.

[0025] Thermal conductivity is measured according to the measurement defined in the document “Technical Notebook 8, Preparation of test specimens for bulk products, Revision index C, date of implementation: 01 / 07 / 2019, ACERMI”, referring to standard EN 14064-1:2007.

[0026] The term “density” of a mineral wool means the mass of mineral wool measured in a container filled with the mineral wool, divided by the volume of the container. In the case of mineral wool packaged in a bag for transporting the mineral wool, the density of the mineral wool is equal to the ratio between the mass of the compressed mineral wool in the bag and the volume of the bag. In the case of blown mineral wool, the measurement of the density of the blown mineral wool is defined in the document "Cahier Technique 8, Confection des exemples d'essais pour les produits en vrac, Index de révision C, date of application: 01 / 07 / 2019, ACERMI", referring to Annex C.2.1 of standard EN 14064-1:2007.

[0027] In the present application, the fineness of the mineral wool fibers is determined by the value of their micronaire, under 5g. The micronaire, also called "fineness index", is representative of the specific surface area of ​​the fibers. The measurement of the micronaire comprises a measurement of the aerodynamic pressure loss 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, it is standardized (DIN 53941 or ASTM D 1448 standards) and it uses a device called a "micronaire device". The method for measuring the micronaire is also described in document WO 2003098209. DETAILED DESCRIPTION OF THE INVENTION

[0028] General structure of the thermal / acoustic insulation product

[0029] One aspect of the invention is a thermal and / or acoustic insulation product comprising loose mineral wool. Preferably, the mineral wool is loose glass wool. The mineral wool comprises mineral fibers. The mineral fibers may be produced by melting an inorganic raw material, preferably glass, stone, and / or slag. The mineral wool is suitable for being blown.

[0030] Preferably, the mineral fibers can be produced by melting a glass having: - a mass rate of SiO2 of between 50% and 75%, and preferably between 60% and 70%, and / or - a mass rate of Na2O of between 10 and 25%, and preferably between 10% and 20%, and / or - a mass rate of CaO of between 5% and 15%, and preferably of between 5% and 10%, and / or - a mass rate of MgO between 1 and 10%, and preferably between 2 and 5%, and / or - a sum of a mass rate of CaO and a mass rate of MgO between 5% and 20%, and / or - a mass rate of B2O3 of between 0% and 10%, in particular between 2% and 8%, preferably between 3% and 6%, and more preferably between 3.5% and 5%; and / or - a mass rate of A12O3 of between 0% and 8%, and preferably of between 1% and 6%, and / or - a mass rate of K2O between 0% and 5%, and preferably between 0.5% and 2%, and / or - a sum of a mass rate of Na2O and a mass rate of K2O between 12% and 20%.

[0031] The product comprises at least one additive. The product has a mass content of the totality of the additive(s) of between 0.4% and 1.2% inclusive, in particular of between 0.6% and 1% inclusive and preferably of between 0.7 and 0.9% inclusive.

[0032] The product has a micronaire of between 4 L / min and 9 L / min, in particular between 5 L / min and 8 L / min and preferably between 6 L / min and 7.5 L / min.

[0033] The inventors discovered that, by the combination between the previously defined additive(s) rate and the previously defined micronaire of the product, it was possible to specifically minimize the radiative heat transfer of a coating formed by the blown product, for a predetermined quantity of blown product, while limiting the emission of dust during the blowing of the product, by the mass rate of additives of the product. The capacity to break fine fibers of a product having the defined micronaire, and thus to emit dust, is compensated by the additive(s) rate of the product, while minimizing, for the defined ranges, the thermal conductivity of the coating formed by the blown product.

[0034] Some or all of the additive(s) may be organic. The mass content of the total additive(s) may be determined by a loss on ignition measurement, in accordance with ISO 1887:2014.

[0035] The insulation product may have a binder mass content of less than 0.1%. In particular, the insulation product may be free of binder, and have a zero binder mass content. However, traces of binder may be present, in particular when the product is manufactured by recycling glass wool comprising a binder.

[0036] Manufacture of the insulation product

[0037] With reference to [Fig.2], an installation for producing the insulating product may comprise a fiberizing unit, in which the mineral fibers are produced. The fiberizing unit may comprise a centrifuging device 1 configured to rotate along a vertical axis X. The centrifuging device 1 has a peripheral strip. The peripheral strip is pierced with a plurality of orifices, through from which the molten raw material can flow from inside the centrifuge device to the outside, forming filaments of molten raw material.

[0038] The fiberizing unit may also comprise a burner 2. The burner 2 may have an annular shape and be arranged so as to impose a gas flow at a controlled temperature at the outlet of the orifices. The burner 2 makes it possible to stretch the filaments leaving the orifices, so as to form the mineral fibers. An annular inductor 3 may be arranged below the centrifugation device. The annular inductor 3 makes it possible to heat a lower part of the centrifugation device 1, in particular the plate. A web 4 of mineral fibers is thus formed. A receiving belt 5 for the mineral fibers may be arranged under the centrifugation device 1.

[0039] The burner 2 is configured so that the temperature of the gas jet at the outlet of the burner 2 is between 1300°C and 1500°C, preferably around 1400°C. The variation in pressure of the burner 2, driving the gas jet, makes it possible to control the fineness of the fibers: a lower pressure of the burner 2 can result in a larger fiber diameter.

[0040] The inventors have discovered that it is possible to significantly increase the proportion of long mineral fibers among all the mineral fibers produced, in the proportions described above, by reducing the quantity of movement transmitted by the burner 2 to the filaments at the outlet of the orifices with respect to the known quantity of movement transmitted. Thus, the pressure of the burner 2 can be imposed between 400 mm CE and 800 mm CE, in particular between 400 mm CE and 450 mm CE (it is recalled that 1 mm CE = 9.81 Pa).

[0041] The rotation speed of the centrifugation device 1 may be between 1600 revolutions per minute and 3000 revolutions per minute, in particular between 2400 revolutions per minute and 3000 revolutions per minute.

[0042] The tangential speed of the orifices, during rotation of the centrifugation device 1, may be between 50 m / s and 80 m / s, and preferably between 57 m / s and 75 m / s. Thus, it is possible to increase the proportion of fibers having a length strictly greater than 1.5 mm and preferably strictly greater than 2.0 mm in the population of fibers of the product. Indeed, the length of the fibers can be increased by increasing the amount of movement provided to the fibers from the outlet of the orifice. However, the amount of movement provided to the fibers by the burner may be concomitant with mechanical stresses experienced by the fibers driven by fluidic turbulence, downstream of the burner. These stresses can lead to breakage of the fibers.Thus, the tangential velocity of the orifices makes it possible to provide a sufficient quantity of movement to the fibers while reducing the mechanical stresses undergone by the fibers in a turbulent fluidic environment.

[0043] The fiber draw 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 draw per orifice of a plate per day may be between 0.30 kg / day and 0.8 kg / day, in particular between 0.4 kg / day and 0.7 kg / day. Preferably, the fiber draw per orifice may be less than 0.40 kg / day. Thus, it is possible to reduce the diameter of the fibers compared to the fibers produced with a higher draw, and thus to counterbalance the effect of the reduction in the quantity of movements transmitted by the burner 2 to the filaments at the outlet of the orifices.

[0044] The plate of the centrifugation device 2 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 2 may comprise at least 36,000 orifices, for example when the diameter of the plate is equal to 400 mm. Thus, for a constant total draw, the draw per orifice is sufficiently small to produce fine fibers, so as to counterbalance the effect of the reduction in the transmission of the quantity of movement of the burner 2 to the filaments at the outlet of the orifices.

[0045] The plate of the centrifugation device 2 has a diameter between 50 mm and 800 mm, and preferably between 400 mm and 600 mm. The pull of the centrifugation device 2 varies with the diameter of the plate.

[0046] The orifices are formed and distributed on the drilling strip of the plate. The height of the drilling strip, in the direction of the axis of rotation X of the centrifugation device, is preferably less than 35 mm. The diameter of the orifices is between 0.5 and 1.1 mm.

[0047] The distance between the centers of neighboring orifices may be between 0.8 mm and 2 mm. This distance may vary by less than 10%, and preferably by less than 3%. The distance between the centers of neighboring orifices may decrease in a direction oriented towards the lower part of the plate.

[0048] The manufacturing method may then comprise a step of recovering the mineral fibers from the carpet 5. Following the recovery step, the manufacturing method may comprise a step of grinding the fibers, then a step of compressing the fibers. The grinding step may also be implemented so as to obtain a product according to an embodiment of the invention.

[0049] The method of manufacturing the product may comprise a step of spraying the entire additive(s) onto the fibers by liquid means. Thus, the additives may be mixed before being sprayed onto the fibers, so that their local concentrations are homogeneous. One aspect of the invention is a product in which the entire additive(s) forms deposits sprayed onto the fibers, preferably a layer sprayed onto the fibers. Preferably, the deposits, preferably the layer(s), are formed by liquid spraying. Indeed, the liquid spray comprising the additive(s) may be distributed homogeneously over the surface of the fibers, in part or entirely, so as to form a layer of additives after evaporation of the solvent from the liquid. The liquid may also form drops or droplets in contact with the fibers, so that, after evaporation of the solvent from the liquid, the additive(s) form deposits having a drop shape.

[0050] Structure and geometry of mineral wool

[0051] With reference to [Fig. 1], the fibers may have a distribution of a population of fiber lengths such that the ratio between the fiber length equal to the 90th percentile in number of the distribution and between the median fiber length in number of the distribution is greater than 3, in particular greater than 4, and preferably greater than 5. Thus, a coating formed by the blown product has both a significant proportion of short fibers and long fibers, which makes it possible both to retain certain fibers leading to an emission of dust during the installation of the coating and to minimize the thermal conductivity with respect to a coating comprising only long fibers.

[0052] For example, [Fig.l] illustrates a distribution of a cumulative frequency of a population of fiber lengths of a product according to an embodiment of the invention for which the fiber length equal to the ninetieth percentile (D90) by number is equal to 1856 pm and the median fiber length (D50) by number is equal to 335.7 pm. The illustrated distribution corresponds to a product in which the ratio between the fiber length equal to the 90th percentile by number of the distribution and the median fiber length by number of the distribution is equal to 5.52.

[0053] An average length of the fibers in number of the distribution can be between 0.5 mm and 1.5 mm inclusive.

[0054] A fiber length equal to the 90th percentile in number of the distribution may be strictly greater than 1 mm, in particular strictly greater than 1.5 mm and preferably strictly greater than 2.0 mm. Thus, it is possible to minimize the emission of dust during the installation of the coating by blowing the product.

[0055] The median fiber length in number of the distribution may be less than or equal to 2 mm, in particular less than 1 mm and preferably between 300 pm and 700 pm.

[0056] A volume-weighted median diameter of the fibers is between 5 pm and 15 pm inclusive, in particular between 6 pm and 12 pm inclusive, and preferably between 7 pm and 10 pm inclusive, and more preferably between 8 pm and 9 pm inclusive. Thus, it is possible to specifically minimize the radiative heat transfer of a coating formed by the blown product, for a quantity of blown product predetermined, while limiting the emission of dust when blowing the product, due to the mass rate of additives in the product.

[0057] The diameter and length of the fibers can be measured by taking a sample of the product or coating. The fibers in the sample are then dispersed in a solvent. The solvent may comprise a mixture of distilled water and glycerin, for example in a proportion of 500:1. The fiber dispersion is then deposited on a substrate, for example on the bottom of a Petri dish. The fibers included in the dispersion are then imaged by a microscope equipped with an objective whose magnification is for example equal to 20X.

[0058] Additives

[0059] In all of the embodiments of the invention, the product has a mass content of the totality of the additive(s) of between 0.4% and 1.2% inclusive, in particular of between 0.6% and 1% inclusive and preferably of between 0.7% and 0.9% inclusive. Thus, as described previously and in combination with the micronaire of the product described, it is possible to maximize the thermal insulation of the product while limiting the emission of dust during installation of the product. Indeed, the additives, which usually comprise organic compounds, promote heat transfer through the product and thus degrade the thermal insulation properties provided by the blown product.

[0060] The additive(s) are preferably chosen from an anti-dust additive, a hydrophobic additive, an antistatic additive and a colorant.

[0061] The thermal insulation product may comprise an antistatic additive. A mass content of the antistatic additive may be between 0.01% and 0.30% inclusive, in particular between 0.02% and 0.20% inclusive, and preferably between 0.05% and 0.15% inclusive.

[0062] The antistatic additive may be at least chosen from a tertiary ammonium, a quaternary ammonium, and a polyethylene glycol. Preferably, the antistatic additive comprises a polyethylene glycol and at least one compound chosen from a tertiary ammonium and a quaternary ammonium. The total mass content of the tertiary ammonium and the quaternary ammonium may be between 0.01% and 0.25%, in particular between 0.01% and 0.05%. The mass content of the polyethylene glycol may be between 0.03% and 0.20%, in particular between 0.05% and 0.10%.

[0063] The antistatic additive may be sprayed onto the mineral fiber web 4 produced following the step of forming a mineral fiber web 4 described above and / or following the fiber grinding step, for example during the transport of the fibers in a pneumatic channel. The antistatic additive makes it possible to increase the value of the electrostatic charge of the mineral fibers of the blown mineral wool. Thus, when depositing a coating obtained by the blown product on the wall to be insulated, the mineral fibers do not cling to the user's clothing. With reference to [Fig.3], the measurement of the electrostatic charge of the blown mineral wool can be implemented by arranging, at the outlet of the conduit through which the blown product is brought to the wall to be insulated, a mobile electrostatic sensor (for example a sensor of the Keyence SK-050 model). The sensor measures an electric potential difference AV near a path through which the blown product is transported, between an electric potential measured when the blown product passes through the path and an electric potential measured at the same location, in the absence of passage of the blown product through the path. The measured potential difference is proportional to the average charge of the fibers passing through the path, and evolves in the same direction. The sensor can, for example, be arranged at the outlet of a pneumatic conduit used to deposit the blown mineral wool on the wall to be insulated.

[0064] The average charge of the blown mineral fibers of a product may be zero or positive. Indeed, it was discovered by the inventors that a zero or positive average charge of the blown fibers was a sufficient condition to observe an antistatic effect of the product on the user's clothing. The term "average charge" means the average of the charges of the mineral fibers measured during the blowing of the product. [Fig. 3] illustrates the average charge of the fibers as a function of the relative humidity (RH) level.

[0065] The insulation product may comprise a hydrophobic additive. The term "hydrophobic" means an additive which, when deposited on the mineral wool, allows the insulation product to have hydrophobic properties. The hydrophobic additive may be sprayed onto the web 4 of mineral fibers produced following the step of forming a web 4 of mineral fibers previously described. A mass content of the hydrophobic additive may be between 0.05% and 0.4% inclusive, and preferably between 0.1% and 0.2%. The hydrophobic additive may be a silicone, for example polydimethylsiloxane (PDMS).

[0066] The thermal insulation product may comprise an anti-dust additive. The anti-dust additive may be sprayed onto the mineral fiber web 4 produced following the step of forming a mineral fiber web 4 described above and / or following the fiber grinding step, for example during the transport of the fibers in a pneumatic channel. The anti-dust additive makes it possible to reduce the formation of dust during the blowing of the wool to be blown, and thus makes it possible to increase the comfort of the user and to prevent the penetration of mineral fibers into the user's respiratory tract. The anti-dust additive may comprise an oil, in particular an oil of vegetable origin and / or an oil of mineral origin. Preferably, the mass content of the anti-dust additive may be determined so that the product has a mass content of the totality of the additive(s) of between 0.4% and 1.2% inclusive, such that the mass rate of the antistatic additive is between 0.01% and 0.30%, and such that the mass rate of the hydrophobic additive is between 0.05% and 0.4% inclusive. Preferably, the mass rate of the anti-dust additive is between 0.34% and 1.14%.

[0067] Macroscopic, thermal properties & consumption of the insulating product

[0068] At the end of the manufacturing process of the product described above, in particular following the fiber compression step, the product has a density greater than that of a coating obtained by blowing the product. The density may be between 100 kg.m3 and 180 kg.m3 inclusive, and preferably between 140 kg.m3 and 160 kg.m 3 inclusive. The density may be the density of the packaged product. Thus, for equal volume, the product may be lighter when packaged than other known products, while preserving the distribution of the fiber length population of the product in this density range. For example, known products obtained from rock wool have a density greater than 200 kg.m3. It is thus possible to facilitate the transport of the product to a construction site.

[0069] Another aspect of the invention is a thermal and / or acoustic insulation coating obtained by blowing a product according to an embodiment of the invention.

[0070] The coating, and indirectly the product, can be used for the thermal and / or acoustic insulation of a wall of a building. The wall can be chosen from a wall, a floor and a floor. The wall can be insulated by depositing the coating by blowing the product.

[0071] Preferably, the coating has a thermal performance factor / of between 0.45 W.kg.K '.m4 and 0.8 W.kg.K '.m^ and in particular between 0.5 W.kg.K1 .m4 and 0.75 W.kg.K '.m 4. Thus, it is possible, in particular due to the characteristics of the product before blowing, to limit both the consumption of the product to install a coating having a thermal resistance predetermined by the user, and at the same time the emission of dust emitted during the blowing of the product. The coating may have a thermal conductivity of between 35 mW.m *.K 1 and 55 mW.m '.K 1 inclusive, in particular of between 40 mW.m '.K1 and 52 mW.m '.K1 inclusive, and preferably of between 43 mW.m *.K1 and 49 mW.m *.K1 inclusive.Furthermore, preferably in combination with the predefined thermal conductivities, the coating, obtained by blowing a product according to an embodiment of the invention, may have a density of between 5 kg / m3 and 18 kg / m3 inclusive, in particular between 7 kg / m3 and 12 kg / m3 inclusive, and preferably between 8.5 kg / m3 and 11 kg / m3 inclusive.

Claims

Claims

1. Thermal and / or acoustic insulation product comprising loose glass wool, the glass wool comprising mineral fibres and being suitable for being blown, the product being characterised in that: - the product comprises at least one additive, the product having a mass content of the totality of the additive(s) of between 0.4% and 1.2% inclusive, in particular of between 0.6% and 1% inclusive and preferably of between 0.7 and 0.9% inclusive, - the product has a micronaire of between 4 L / min and 9 L / min.

2. Product according to one of claims 1, in which a volume-weighted median diameter of the fibers is between 5 pm and 15 pm inclusive, in particular between 6 pm and 12 pm inclusive, and preferably between 7 pm and 10 pm inclusive.

3. Product according to claim 1 or 2, in which the fibers have a distribution of a population of fiber lengths such that the ratio between the fiber length equal to the 90th percentile in number of the distribution and between the median fiber length in number of the distribution is greater than 3 and preferably greater than 4.

4. Product according to one of claims 1 to 3, in which the fiber length equal to the 90th percentile in number of the distribution is strictly greater than 1 mm, in particular strictly greater than 1.5 mm and preferably strictly greater than 2.0 mm.

5. Product according to one of claims 1 to 4, in which the median fiber length in number of the distribution is less than or equal to 2 mm, in particular less than 1 mm and preferably between 300 pm and 700 pm.

6. Product according to one of claims 1 to 5, in which the product has a density of between 100 kg.m3 and 180 kg.m3 inclusive, in particular of between 140 kg.m3 and 160 kg.m3 inclusive.

7. Product according to one of claims 1 to 6, wherein the additive(s) comprise at least one additive chosen from an anti-dust additive, a hydrophobic additive, an antistatic additive and a colorant.

8. Product according to one of claims 1 to 7, in which the additive(s) comprise an antistatic additive, a mass rate of the antistatic additive being between 0.01% and 0.30% inclusive, in particular between 0.02% and 0.20% inclusive, and preferably between 0.05% and 0.15% inclusive.

9. Product according to one of claims 1 to 8, in which the additive(s) comprise an antistatic additive, and in which the antistatic additive is chosen from a tertiary ammonium, a quaternary ammonium, and a polyethylene glycol.

10. Product according to one of claims 1 to 9, in which the additive(s) comprise a hydrophobic additive, a mass rate of the hydrophobic additive being between 0.05% and 0.4% inclusive.

11. A product according to any one of claims 1 to 10, wherein an average fiber length in number of fibers is between 0.5 mm and 1.5 mm inclusive.

12. Product according to one of claims 1 to 11, in which the whole of the additive(s) forms sprayed deposits on the fibers.

13. Thermal and / or acoustic insulation coating obtained by blowing a product according to one of claims 1 to 12.

14. Thermal and / or acoustic insulation coating according to claim 13, having a thermal performance factor / of between 0.45 W.kg.K '.m4 and 0.8 W.kg.K '.m^and in particular between 0.5 W.kg.K '.m 4 and 0.75 W.kg.K '.m 4.

15. Thermal and / or acoustic insulation coating according to claim 13 or 14, having a density of between 5 kg / m3 and 18 kg / m3 inclusive, in particular between 7 kg / m3 and 12 kg / m3 inclusive and preferably between 8.5 kg / m3 and 11 kg / m3 inclusive.

16. Thermal and / or acoustic insulation coating according to one of claims 13 to 15, having a thermal conductivity of between 35 mW.m '.K 1 and 60 mW.m '.K 1 inclusive, in particular of between 40 mW.m *.K1 and 55 mW.m *.K1 inclusive, and preferably of between 45 mW.m *.K1 and 52 mW.m '.K 1 inclusive.

17. Method of manufacturing a product according to one of claims 1 to 12, comprising a step of spraying all of the additive(s) onto the fibers by liquid means.

18. Use of the product according to one of claims 1 to 12 for the thermal and / or acoustic insulation of a wall of a building.

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