FR3132532A1 - PRODUCT COMPRISING A MINERAL WOOL TO BLOW - Google Patents

Abstract

The present invention relates to a thermal and/or acoustic insulation product comprising loose mineral wool, the mineral wool comprising mineral fibers and being adapted to be blown, 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 by number of the distribution and between the median fiber length by number of the distribution is greater than 3 and in which the product comprises at least one additive, the product having a rate weight of all of the additive(s) between 0.4% and 1.2% inclusive. Figure for the abstract: Fig. 1

Description

PRODUCT COMPRISING MINERAL WOOL TO BLOW FIELD OF THE INVENTION

The present invention relates to a thermal and/or acoustic insulation product comprising a mineral wool to be blown, preferably a glass wool, as well as a coating obtained by blowing such a product.

STATE OF THE ART

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. Glass wool compressed in a bag undergoes an initial 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 carder to the wall to be insulated in a pneumatic conduit. This method makes it possible to cover a wall with an irregular morphology with glass wool. This method also makes it possible to reduce the volume of glass wool between its production and its use.

However, when the glass wool is deposited on the wall, a significant part of the glass wool can be dispersed into the ambient atmosphere. The part dispersed in the atmosphere is called glass wool “ dust ”. This dust presents a user comfort problem when blowing glass wool.

It is known to reduce the quantity of dust emitted when blowing glass wool and thus to increase user comfort by adding a mineral oil to the glass wool.

However, the addition of mineral oil to the glass wool leads to an increase in the thermal conductivity λ of the blown glass wool, which reduces the thermal and/acoustic performance of the blown glass wool.

To this end, document US 2017 0198472 describes a glass wool in which the mass content of mineral oil has been reduced compared 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.

However, the glass wool described by document US 2017 0198472 has high thermal conductivity for a predetermined density of glass wool installed on a wall. In addition, the glass wool described causes a significant quantity of dust dispersed in the ambient atmosphere during its blowing. Thus, there is a need to produce glass wool having both low thermal conductivity for a predetermined installed glass wool density and high user comfort.

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 the installation of the product by an user.

This aim is achieved in the context of the present invention thanks to a thermal and/or acoustic insulation product comprising a bulk mineral wool, the mineral wool comprising mineral fibers and being suitable for being blown, and 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, notably greater than 4, and preferably greater than 5,
- the product comprising at least one additive, the product having a mass level of all of the additive(s) of between 0.4% and 1.2% inclusive, in particular between 0.6% and 1% inclusive and preferably between 0.7 and 0.9% inclusive.

The present invention is advantageously supplemented by the following characteristics, taken individually or in any of their technically possible combinations:
- 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,
- 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 µm and 700 µm,
- mineral wool is glass wool, the product preferably having a density of between 100 kg.m ^-3 and 180 kg.m ^-3 inclusive, in particular between 140 kg.m ^-3 and 160 kg.m ^-3 included,
- 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 level 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,
- the additive(s) comprise an antistatic additive, the antistatic additive being chosen from a tertiary ammonium, a quaternary ammonium and a polyethylene glycol,
- the additive(s) comprise a hydrophobic additive, a mass content of the hydrophobic additive being between 0.05% and 0.4% inclusive,
- an average length of the fibers in number of fibers is between 0.5 mm and 1.5 mm inclusive,
- a volume-weighted median diameter of the fibers is between 5 µm and 15 µm inclusive, in particular between 6 µm and 12 µm inclusive, and preferably between 7 µm and 10 µm inclusive, and more preferably between 8 µm and 9 µm inclusive ,
- the product is able to present, after being blown, a thermal performance factor χ of between 0.45 W.kg.K ^-1 .m ^-4 and 0.8 W.kg.K ^-1 .m ^-4 _, and in particular between 0.5 W.kg.K ^-1 .m ^-4 and 0.75 W.kg.K ^-1 .m ^-4 ,
- the product is capable of having, after having been blown, a density of between 5 kg/m ³ and 18 kg/m ³ inclusive, in particular between 7 kg/m ³ and 12 kg/m ³ inclusive and preferably between 8 .5 kg/m ³ and 11 kg/m ³ included,
- all of the additive(s) forms sprayed deposits on the fibers, preferably a layer sprayed on the fibers, preferably by liquid means.

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

The coating advantageously has a thermal performance factor χ of between 0.45 W.kg.K ^{-1.m -4} and 0.8 W.kg.K ^{-1.m -4} _, and in particular between 0.5 W. kg.K ^-1 .m ^-4 and 0.75 W.kg.K ^-1 .m ^-4 .

The coating advantageously has a density of between 5 kg/m ³ and 18 kg/m ³ inclusive, in particular between 7 kg/m ³ and 12 kg/m ³ inclusive and preferably between 8.5 kg/m ³ and 11 kg/m ³ included.

The coating advantageously has a thermal conductivity of between 35 mW.m ^-1 .K ^-1 and 60 mW.m ^-1 .K ^-1 inclusive, in particular between 40 mW.m ^-1 .K ^-1 and 55 mW.m ^-1 .K ^-1 inclusive, and preferably between 45 mW.m ^-1 .K ^-1 and 52 mW.m ^-1 .K ^-1 inclusive.

Another aspect of the invention is a process for manufacturing a product according to one embodiment of the invention, the process comprising a step of spraying all of the additive(s) onto the fibers by liquid means.

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 FIGURES

Other characteristics, aims and advantages of the invention will emerge from the description which follows, which is purely illustrative and not limiting, and which must be read with reference to the appended drawings in which:

- there illustrates a distribution of a cumulative frequency of a population of fiber lengths of a product according to one embodiment of the invention.

- there schematically illustrates an installation for producing an insulating product according to one embodiment of the invention,

- there illustrates the average integrated charge of the mineral fibers of a product according to one embodiment of the invention, blown.

In all the figures, similar elements bear identical references.

DEFINITIONS

By “ thermal performance factor χ” is meant the product of the thermal conductivity λ, expressed in Wm ^-1 .K ^-1 , and the density ρ of a product according to one embodiment of the blown invention, expressed in kg/ ^m3 . The thermal performance factor χ 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 χ 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 area S. Thus, the thermal performance of mineral wool can be determined by the product of the predetermined thermal resistance R and the thermal performance factor χ.

By “ blowing ” of mineral wool we mean blowing defined by standard EN 14064-1:2007, and preferably defined by the document “ Technical Specifications 8, Preparation of test specimens for bulk products, Revision index C, date of application: 01/07/2019, ACERMI ”, referring to appendix C.2.1 of standard EN 14064-1:2007.

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

The term “ density ” of mineral wool means the mass of mineral wool measured in a container filled with mineral wool, divided by the volume of the container. In the case of mineral wool packaged in a bag allowing the mineral wool to be transported, the density of the mineral wool is equal to the ratio between the mass of the mineral wool compressed in the bag and between 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, Preparation of test specimens for bulk products, Revision index C, date of implementation: 01/07/2019, ACERMI ”, referring to appendix C.2.1 of standard EN 14064-1:2007.

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 micronaire measurement includes 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 usual 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 micronaire measurement method is also described in document WO 2003098209.

DETAILED DESCRIPTION OF THE INVENTION

General structure of the thermal/acoustic insulation product and distribution of the fiber length population

One aspect of the invention is a thermal and/or acoustic insulation product comprising bulk mineral wool. Preferably, the mineral wool is bulk glass wool. Mineral wool includes mineral fibers. Mineral fibers can be produced by melting an inorganic raw material, preferably glass, stone, and/or slag. Mineral wool is suitable for blowing.

Preferably, the mineral fibers can be produced by melting a glass having:
- a mass content of SiO ₂ between 50% and 75%, and preferably between 60% and 70%, and/or
- a mass content of Na ₂ O of between 10 and 25%, and preferably between 10% and 20%, and/or
- a mass content of CaO between 5% and 15%, and preferably between 5% and 10%, and/or
- a mass content of MgO of 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 of between 5% and 20%, and/or
- a mass content of B ₂ O ₃ 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 content of Al ₂ O ₃ of between 0% and 8%, and preferably between 1% and 6%, and/or
- a mass content of K ₂ O between 0% and 5%, and preferably between 0.5% and 2%, and/or
- a sum of a mass rate of Na ₂ O and a mass rate of K ₂ O of between 12% and 20%.

In reference to the , 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, notably greater than 4, and preferably greater than 5.

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

The inventors discovered that it was thus possible to minimize the thermal conductivity 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. Indeed, 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 the emission of dust during the installation of the coating and at the same time to minimize thermal conductivity compared to a coating comprising only long fibers.

Part or all of the additive(s) may be organic. The mass rate of all of the additive(s) can be determined by measuring loss on ignition , in accordance with standard ISO 1887:2014.

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

For example, the 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) in number is equal at 1856 µm and the median fiber length (D50) in number is equal to 335.7 µm. The distribution shown corresponds to a product in which the ratio between the fiber length equal to the ^90th percentile in number of the distribution and the median fiber length in number of the distribution is equal to 5.52.

Manufacturing of the insulation product

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

The fiberizing unit may also include 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. Burner 2 allows the filaments coming out of the orifices to be stretched, so as to form the mineral fibers. An annular inductor 3 can 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 veil 4 of mineral fibers is thus formed. A mat 5 for receiving the mineral fibers can be arranged under the centrifugation device 1.

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 burner 2, driving the gas jet, makes it possible to control the fineness of the fibers: a lower pressure of burner 2 can result in a larger fiber diameter.

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 in exit from the orifices with regard to the known transmitted momentum. Thus, the pressure of burner 2 can be imposed between 400 mm CE and 800 mm CE, in particular between 400 mm CE and 450 mm CE (remember that 1 mm CE = 9.81 Pa).

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

The tangential speed of the orifices, during the rotation of the centrifugation device 1, can 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 quantity of movement brought to the fibers from the exit of the orifice. However, the quantity of movement provided to the fibers by the burner can be concomitant with mechanical stresses suffered by the fibers driven by fluid turbulence, downstream of the burner. These stresses can lead to fiber breakage. Thus, the tangential speed of the orifices makes it possible to provide a sufficient quantity of movement to the fibers while reducing the mechanical stresses experienced by the fibers in a turbulent fluid environment.

The fiber draw per orifice of a plate per day is equal to the flow rate of melted raw material passing through each orifice per day. The fiber intake 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. 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 pull, and thus to counterbalance the effect of the reduction in the quantity of movements transmitted by the burner 2 to the filaments leaving the orifices.

The plate of the centrifugation device 2 may include 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 can comprise at least 36,000 orifices, for example when the diameter of the plate is equal to 400 mm. Thus, for a constant total pull, the pull per orifice is sufficiently small to produce fine fibers, so as to counterbalance the effect of the reduction in the transmission of the momentum of the burner 2 to the filaments leaving the orifices.

The plate of the centrifugation device 2 has a diameter of 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.

The holes 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 holes is between 0.5 and 1.1 mm.

The distance between the centers of neighboring holes 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 neighboring holes can decrease in a direction facing the lower part of the plate.

The manufacturing process can then include a step of recovering the mineral fibers on the mat 5. Following the recovery step, the manufacturing process can include a step of grinding the fibers, then a step of compressing the fibers. The grinding step can also be implemented so as to obtain a product according to one embodiment of the invention.

The product manufacturing process may include a step of spraying all of the additive(s) onto the fibers by liquid means. Thus, the additives can be mixed before being sprayed on the fibers, so that their local concentrations are homogeneous. One aspect of the invention is a product in which all of the additive(s) forms sprayed deposits on the fibers, preferably a sprayed layer on the fibers. Preferably, the deposits, preferably the layer(s), are formed by liquid spraying. Indeed, the sprayed liquid comprising the additive(s) can be distributed homogeneously on the surface of the fibers, partially or entirely, so as to form a layer of additives after the evaporation of the solvent from the liquid. The liquid may also form drops or droplets in contact with the fibers, so that, after the solvent from the liquid evaporates, the additive(s) form drop-shaped deposits.

Structure and geometry of mineral wool

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

A fiber length equal to the ^90th percentile in number of the distribution can 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 dust emissions during the installation of the coating by blowing the product.

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 µm and 700 µm.

The product can have 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. Thus, it is possible to specifically minimize the radiative heat transfer of the coating formed by the blown product while limiting the emission of dust during the blowing of the product due to the mass rate of additive in the product.

A volume-weighted median diameter of the fibers is between 5 µm and 15 µm inclusive, in particular between 6 µm and 12 µm inclusive, and preferably between 7 µm and 10 µm inclusive, and more preferably between 8 µm and 9 µm inclusive. Thus, it is 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, due to the mass rate of product additives.

Fiber diameter and length can be measured by taking a sample of the product or coating. The sample fibers are then dispersed in a solvent. The solvent may comprise a mixture of distilled water and glycerin, for example in a ratio 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 fitted with an objective whose magnification is for example equal to 20X.

Additives

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

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

The thermal insulation product may include an antistatic additive. A mass level of the antistatic additive can 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.

The antistatic additive can 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 tertiary ammonium and quaternary ammonium can be between 0.01% and 0.25%, in particular between 0.01% and 0.05%. The mass content of polyethylene glycol can be between 0.03% and 0.20%, in particular between 0.05% and 0.10%.

The antistatic additive can be sprayed on the veil of mineral fibers 4 produced following the step of forming a veil 4 of mineral fibers previously described and/or following the step of grinding the fibers, for example during transport fibers in a pneumatic channel. The antistatic additive makes it possible to increase the value of the electrostatic charge of the mineral fibers of 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. In reference to the , 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 towards the wall to be insulated, a mobile electrostatic sensor (for example a sensor of the Keyence model SK-050). The sensor measures an electric potential difference ΔV near a path by 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 passage of the product blown by 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 pipe used to deposit the blown mineral wool on the wall to be insulated.

The average charge of the blown mineral fibers of a product can 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. By “average load” we mean the average of the loads of the mineral fibers measured during the blowing of the product. There illustrates the average fiber load as a function of relative humidity (RH).

The insulation product may include a hydrophobic additive. “ Hydrophobic ” means an additive which, when deposited on mineral wool, allows the insulation product to exhibit hydrophobic properties. The hydrophobic additive can be sprayed onto the veil 4 of mineral fibers produced following the step of forming a veil 4 of mineral fibers previously described. A mass content of the hydrophobic additive can 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).

The thermal insulation product may include an anti-dust additive. The anti-dust additive can be sprayed onto the veil of mineral fibers 4 produced following the step of forming a veil 4 of mineral fibers previously described and/or following the step of grinding the fibers, for example during transport of fibers in a pneumatic channel. The anti-dust additive reduces the formation of dust when blowing the wool to be blown, and thus increases user comfort and prevents the penetration of mineral fibers into the respiratory tract of the wool. user. 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 rate of the anti-dust additive can be determined so that the product has a mass rate of all of the additive(s) of between 0.4% and 1.2% inclusive, so that the rate mass of the antistatic additive is between 0.01% and 0.30%, and therefore the mass content of the hydrophobic additive is between 0.05% and 0.4% inclusive. Preferably, the mass content of the anti-dust additive is between 0.34% and 1.14%.

Macroscopic, thermal properties & consumption of the insulating product

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 can be between 100 kg.m ^-3 and 180 kg.m ^-3 inclusive, and preferably between 140 kg.m ^-3 and 160 kg.m ^-3 inclusive. The density can be the density of the packaged product. Thus, for equal volume, the product can 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.m ^-3 . It is thus possible to facilitate the delivery of the product to a construction site. The product comprising mineral wool is preferably packaged in bulk. The product can be compressed in a bag so that it has the previously defined density.

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

The coating, and indirectly the product, can be used for 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.

Preferably, the coating has a thermal performance factor χ of between 0.45 W.kg.K ^{-1.m -4} and 0.8 W.kg.K ^{-1.m -4} _, and in particular between 0.5 W.kg.K ^-1 .m ^-4 and 0.75 W.kg.K ^-1 .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 both the emission of dust emitted during of product blowing. The coating may have a thermal conductivity of between 35 mW.m ^-1 .K ^-1 and 55 mW.m ^-1 .K ^-1 inclusive, in particular between 40 mW.m ^-1 .K ^-1 and 52 mW.m ^-1 .K ^-1 inclusive, and preferably between 43 mW.m ^-1 .K ^-1 and 49 mW.m ^-1 .K ^-1 inclusive. Furthermore, preferably in combination with the predefined thermal conductivities, the coating, obtained by blowing a product according to one embodiment of the invention, can have a density of between 5 kg/m ³ and 18 kg/m ³ included, in particular between 7 kg/m ³ and 12 kg/m ³ inclusive, and preferably between 8.5 kg/m ³ and 11 kg/m ³ inclusive.

Claims (20)

Thermal and/or acoustic insulation product comprising bulk mineral wool, the mineral wool comprising mineral fibers and being suitable for being blown, the product being characterized in that:
- the fibers have a distribution of a population of fiber lengths such that the ratio between the fiber length equal to 90^thpercentile in number of the distribution and between the median fiber length in number of the distribution is greater than 3,
- the product comprising at least one additive, the product having a mass level of all of the additive(s) of between 0.4% and 1.2% inclusive, in particular between 0.6% and 1% inclusive and preferably between 0.7 and 0.9% inclusive. Product according to claim 1, having 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. Product according to claim 1 or 2, in which the fiber length equal to 90^thpercentile 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. Product according to one of claims 1 to 3, 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 µm and 700 µm. Product according to one of claims 1 to 4, in which the mineral wool is glass wool, the product preferably having a density of between 100 kg.m^-3and 180 kg.m^-3included, notably between 140 kg.m^-3and 160 kg.m^-3included. Product according to one of claims 1 to 5, in which the additive(s) comprise at least one additive chosen from an anti-dust additive, a hydrophobic additive, an antistatic additive and a dye. Product according to one of claims 1 to 4, in which the additive(s) comprise an antistatic additive, a mass level 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. Product according to one of claims 1 to 7, 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. Product according to one of claims 1 to 8, in which the additive(s) comprise a hydrophobic additive, a mass content of the hydrophobic additive being between 0.05% and 0.4% inclusive. Product according to one of claims 1 to 9, in which an average length of the fibers in number of fibers is between 0.5 mm and 1.5 mm inclusive. Product according to one of claims 1 to 10, in which a volume-weighted median diameter of the fibers is between 5 µm and 15 µm inclusive, in particular between 6 µm and 12 µm inclusive, and preferably between 7 µm and 10 µm included. Product according to one of claims 1 to 11, capable of presenting, after having been blown, a thermal performance factor χ of between 0.45 W.kg.K^-1.m^-4and 0.8 W.kg.K^-1.m^-4 _,and in particular between 0.5 W.kg.K^-1.m^-4and 0.75 W.kg.K^-1.m^-4. Product according to one of claims 1 to 12, capable of having, after having been blown, a blown density of between 5 kg/m³and 18 kg/m³included, in particular between 7 kg/m³and 12 kg/m³included and preferably between 8.5 kg/m³and 11 kg/m³included. Product according to one of claims 1 to 13, in which all of the additive(s) forms sprayed deposits on the fibers. Thermal and/or acoustic insulation coating obtained by blowing a product according to one of claims 1 to 14. Coating according to claim 15, the coating having a thermal performance factor χ of between 0.45 W.kg.K^-1.m^-4and 0.8 W.kg.K^-1.m^-4 _,and in particular between 0.5 W.kg.K^-1.m^-4and 0.75 W.kg.K^-1.m^-4. Coating according to claim 15 or 16, the coating having a density of between 5 kg/m³and 18 kg/m³included, in particular between 7 kg/m³and 12 kg/m³included and preferably between 8.5 kg/m³and 11 kg/m³included. Coating according to one of claims 15 to 17, the coating having a thermal conductivity of between 35 mW.m^-1.K^-1and 60 mW.m^-1.K^-1included, in particular between 40 mW.m^-1.K^-1and 55 mW.m^-1.K^-1included, and preferably between 45 mW.m^-1.K^-1and 52 mW.m^-1.K^-1included. Method of manufacturing a product according to one of claims 1 to 14, comprising a step of spraying all of the additive(s) onto the fibers by liquid means. Use of the product according to one of claims 1 to 14 for the thermal and/or acoustic insulation of a wall of a building.