Articles containing sprayed mineral wool

Abstract

The present invention relates to a thermal insulation article comprising mineral wool, the mineral wool comprising mineral fibers, the fibers having a fiber length population distribution such that the median fiber length by frequency distribution is less than or equal to 2 mm, with at least 10% of the population having a fiber length strictly greater than 1.5 mm, preferentially strictly greater than 2.0 mm, the article comprising at least one additive, the article having a total weight percentage of the additive between 0.4% and 1.2%, in particular between 0.6% and 1%.

Description

[Technical field]

[0001] The present invention relates to thermal and / or acoustic insulation articles comprising sprayed mineral wool, preferably glass wool, and to coatings obtained by spraying such articles. [Background technology]

[0002] It is known to thermally and / or acoustically insulate a barrier of a building, such as a wall, a floor or the ground, by depositing sprayed glass wool in contact with the barrier. The glass wool, compressed in a bag, undergoes a first expansion upon opening of the bag. The glass wool is then introduced into a device configured to spray the glass wool, for example comprising a carder, where it undergoes a second expansion. The glass wool is then conveyed in a pneumatic conduit from the machine to the barrier to be insulated. This method makes it possible to cover barriers having irregular shapes with glass wool. It 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 barrier, a significant portion of the glass wool may be dispersed into the surrounding atmosphere. The dispersed portion is identified as glass wool "dust". This dust poses a comfort problem for users when spraying the glass wool.

[0004] It is known that the addition of mineral oil to glass wool reduces the amount of dust produced when spraying the glass wool, thus increasing user comfort.

[0005] However, the addition of mineral oil into the glass wool causes an increase in the thermal conductivity λ of the blown glass wool, which reduces the thermal and / or acoustic performance of the blown glass wool.

[0006] To this end, US Patent Application Publication No. 2017 / 0198472 describes a mineral wool in which the weight percentage of mineral oil is reduced compared to the prior art. The weight percentage of mineral oil in the mineral wool described in US Patent Application Publication No. 2017 / 0198472 is 0.1% to 0.6% of the total mass of the mineral wool.

[0007] However, the glass wool described by US2017 / 0198472 has a high thermal conductivity for a given density of the glass wool installed on the barrier. Furthermore, the described glass wool causes a large amount of dust to be scattered into the surrounding atmosphere when sprayed. Therefore, there is a need to produce glass wool that has both low thermal conductivity for a given installed density of the glass wool and high installation comfort for the user. Summary of the Invention [Problem to be solved by the invention]

[0008] One object of the present invention is to propose a thermal and / or acoustic insulation article that has a thermal conductivity equal to or less than that of known mineral wool, while minimizing the amount of dust released upon installation of the article by the user. [Means for solving the problem]

[0009] This object is achieved within the scope of the present invention by a thermal and / or acoustic insulation article comprising mineral wool, the mineral wool comprising mineral fibres and suitable for being blown, which is as follows: - the fibres have a fibre length population distribution in which the median fibre length by frequency distribution is less than or equal to 2 mm, with at least 10% of the population by number having a fibre length strictly greater than 1.5 mm, in particular strictly greater than 2.0 mm and preferentially strictly greater than 2.5 mm, the article comprises at least one additive, the article having a total weight percentage of the one or more additives of between 0.4% and 1.2%, in particular between 0.6% and 1%, preferably between 0.7% and 0.9%.

[0010] The invention is advantageously completed by the following characteristics, taken individually or in any of their technically possible combinations: the median fiber length according to the frequency distribution is less than or equal to 1.5 mm, preferably less than or equal to 1 mm; - Mineral wool is glass wool, - The item weighs 100 kg m -3 ~180kg m -3 , especially 120kg m -3 ~160kg m -3 , preferentially 140 kg m -3 ~160kg m -3 and having a density of the one or more additives comprise at least one additive selected from anti-dust additives, hydrophobizing additives, antistatic additives, and dyes; the additive or additives comprise an antistatic agent, the weight percentage of which is between 0.01% and 0.30%, in particular between 0.02% and 0.20% and preferentially between 0.05% and 0.15%, - the one or more additives comprise an antistatic agent, the antistatic agent being selected from tertiary ammonium, quaternary ammonium, and polyethylene glycol; - the one or more additives include a hydrophobic additive, and the weight percentage of the hydrophobic additive is between 0.05% and 0.4%; - The average length of the fibers, depending on the number of fibers, is between 0.5 mm and 1.5 mm; the volume-weighted median diameter of the fibres is between 5 μm and 15 μm, in particular between 6 μm and 12 μm, preferentially between 7 μm and 10 μm; - the median fiber length in number is between 300 μm and 700 μm; - After the item is sprayed, it has a load of 0.45 W kg -1 m -4 ~0.8W kg K -1 m-4 , especially 0.5 W kg K -1 m -4 ~0.75W kg K -1 m -4 and a thermal performance coefficient χ, - Mineral wool has a micronaire which is 4L / min~9L / min.

[0011] Another aspect of the invention is a thermal and / or acoustic barrier coating obtained by spraying an article according to an embodiment of the invention, said coating advantageously having a thermal and / or acoustic barrier coating of less than 0.45 W kg K -1 m -4 ~0.8W kg K -1 m -4 , especially 0.5 W kg K -1 m -4 ~0.75W kg K -1 m -4 The thermal performance coefficient χ is

[0012] Advantageously, the coating has a thickness of 5 kg / m 3 ~18kg / m 3 , especially 7kg / m 3 ~12kg / m 3 The density is

[0013] Advantageously, the coating has a thermal conductivity of 35 mW·m -1 ·K -1 ~55mW m -1 ·K -1 , especially 40 mW m -1 ·K -1 ~52mW m -1 ·K -1 , preferentially 43 mW m -1 ·K -1 ~49mW m -1 ·K -1 The thermal conductivity is

[0014] Another aspect of the invention is the use of an article according to an embodiment of the invention for the thermal and / or acoustic insulation of a barrier in a building.

[0015] Text description of the illustration image024.gif.

[0016] Other characteristics, objects and advantages of the present invention will become apparent from the following description, which is purely illustrative and non-limiting and should be read in conjunction with the accompanying drawings, in which: [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 shows the population distribution of fibre lengths of an article according to one embodiment of the invention. [Diagram 2] FIG. 2 shows diagrammatically an installation for producing a blocking article according to an embodiment of the present invention; [Diagram 3] FIG. 3 shows the integrated average charge of the mineral fibres of an article according to an embodiment of the invention. [Figure 4] - Figure 4 shows the variation in coating consumption with weight percentage of all additives and fiber length distribution. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] In all figures, similar elements are given the same reference numbers.

[0019] definition

[0020] "Thermal performance coefficient χ" is W·m -1 ·K -1 and the thermal conductivity λ, expressed as kg / m 3 The thermal performance factor χ represents, in a known manner, the amount of mineral wool to be sprayed to obtain a given thermal resistance R on the barrier. In this way, the thermal performance of the mineral wool can be determined by the product of a given thermal resistance R and the thermal performance factor χ.

[0021] "Spraying" of mineral wool means spraying as defined by standard EN 14064-1:2007, with priority reference to Annex C.2.1 of standard EN 14064-1:2007 and means spraying as defined by "Café Technique 8, Construction of products in vrac, Revision C, Date of application: 01 / 07 / 2019, ACERMI".

[0022] The thermal conductivity is measured according to the measurement method defined in "Café Technique 8, Preparation of Excipients for Products in Vrac, Revision C, Date of Application: 01 / 07 / 2019, ACERMI" with reference to the EN 14064-1:2007 standard.

[0023] "Density" of mineral wool means the mass of the mineral wool measured in a container completely filled with mineral wool divided by the volume of the container. In the case of mineral wool packed in a bag for the transport of mineral wool, the density of the mineral wool is equal to the ratio of the mass of the mineral wool in the bag to the volume of the bag. In the case of sprayed mineral wool, the measurement of the density of sprayed mineral wool is defined in "Café Technique 8, Confection des eprouvettes d'essais pour les produits en vrac, Indice de revision C, dated mise en application: 01 / 07 / 2019, ACERMI" with reference to Annex C.2.1 of the EN 14064-1:2007 standard.

[0024] In this application, the fineness of mineral wool fibers is determined by their Micronaire value under 5 g. Micronaire measurement, also called "fineness index", represents the specific surface area of ​​the fibers and involves measuring the aerodynamic pressure drop when a given amount of fibers extracted from an unsized mat is exposed to a gas (typically air or nitrogen) at a given pressure. This measurement is standard practice in mineral fiber production units, it is standardized (DIN 53941 or ASTM D 1448 standards) and uses what is called a "Micronaire tester". The method for measuring Micronaire is also described in WO 2003 / 098209.

[0025] Detailed Description of the Invention

[0026] General structure of heat / acoustic insulation articles

[0027] One aspect of the invention is a thermal and / or acoustic insulation article comprising mineral wool. Preferably, the mineral wool is glass wool. The mineral wool comprises mineral fibres. The glass wool comprises glass fibres in a known manner. The mineral fibres are produced by melting inorganic raw materials, preferably glass, stone and / or slag. The mineral wool is suitable for being sprayed.

[0028] Preferably, the mineral fibres may be produced by melting a glass having: - 50% to 75%, preferably 60% to 70% SiO 2 and / or - 10% to 25%, preferably 10% to 20% Na 2 Weight percent of O, and / or a weight percentage of CaO between 5% and 15%, preferably between 5% and 10%, and / or a weight percentage of MgO between 1% and 10%, preferably between 2% and 5%, and / or the sum of the weight percentage of CaO and the weight percentage of MgO being between 5% and 20%, and / or - 0% to 10%, in particular 2% to 8%, preferably 3% to 6%, more preferably 3.5% to 5% B 2 O 3 and / or - 0% to 8%, preferably 1% to 6% Al 2 O 3 and / or - K, 0% to 5%, preferably 0.5% to 2% 2 Weight percent of O, and / or - 12%~20% Na 2 Weight percent of O and K 2 Sum of weight percent of O.

[0029] 1, the fibers have a population distribution of fiber lengths such that the median fiber length by frequency distribution is less than or equal to 2 mm, in particular less than or equal to 1.5 mm, and preferentially less than 1 mm. Additionally, at least 10% of the population by number have a fiber length strictly greater than 1.5 mm, in particular strictly greater than 2.0 mm, and preferentially strictly greater than 2.5 mm.

[0030] The article comprises at least one additive. The article has a total weight percentage of the one or more additives of between 0.4% and 1.2%, in particular between 0.6% and 1%, and preferentially between 0.7% and 0.9%.

[0031] The inventors have thus discovered that it is possible to minimize the thermal conductivity of the insulation article while reducing the emission of dust during spraying of the insulation article by combining the above-mentioned additive percentages with the above-mentioned fiber length distribution having a high proportion of both short and long fibers.

[0032] Preferably, the insulation article has a binder weight percent of less than 0.1%. In particular, the insulation article may be binder-free or have a binder weight percent of zero. However, trace amounts of binder may be present, especially if the article is manufactured by recycling glass wool that contains binder.

[0033] With reference to FIG. 4, the consumption of the thermal barrier coating can be reduced in a synergistic manner by selecting an article having a weight percentage of all additives falling within the ranges defined above and by selecting a fiber length population distribution as defined above. The consumption is expressed as a percentage of the consumption of the coating corresponding to point (a). Point (a) shows a coating with a total weight percentage of additives equal to 1.6%, in which strictly less than 10% by number of the fibers of the population have a length greater than 1.5 mm. Point (b) shows a coating with a total weight percentage of additives equal to 0.8%, in which strictly less than 10% by number of the fibers of the population have a length greater than 1.5 mm. Point (c) shows a coating with a total additive content of 1.6% by weight, in which the fibers have a fiber length population distribution such that the median fiber length by frequency distribution is less than or equal to 2 mm, in which at least 10% by number of the population have a fiber length greater than 1.5 mm. Point (d) shows a coating according to one embodiment of the present invention having a total weight percent of additives equal to 0.8%, in which the fibers have a fiber length population distribution such that the median fiber length by frequency distribution is 2 mm or less, and in which at least 10% of the population by number have a fiber length strictly greater than 1.5 mm.

[0034] Manufacturing of barrier products

[0035] With reference to Figure 2, an installation for producing an insulation article may have a fiberization unit, in which mineral fibers are produced. The fiberization unit may have a centrifuge device 1 configured to rotate along a vertical axis X. The centrifuge device 1 has a peripheral strip. The peripheral strip is pierced by a number of orifices, through which molten raw material may flow from the interior of the centrifuge device, forming filaments of the molten raw material.

[0036] The fiberization unit may also include a burner 2, which may have an annular shape and may be arranged to bring a gas flow of controlled temperature to the outlet of the orifice. The burner 2 makes it possible to draw the filaments emerging from the orifice, thereby forming the mineral fibres. An annular inductor 3 may be arranged below the centrifuge device. The annular inductor 3 makes it possible to heat the lower part of the centrifuge device 1, in particular the spinner. In this way, a web 4 of mineral fibres is formed. A belt 5 for receiving the mineral fibres may be arranged below the centrifuge device 1.

[0037] The burner 2 is configured such that the temperature of the gas jet at the outlet of the burner 2 is between 1300° C. and 1500° C., preferably about 1400° C. Variation of the pressure of the burner 2, which drives the gas jet, makes it possible to control the fineness of the fibers: a relatively low burner pressure 2 may result in a relatively large fiber diameter.

[0038] The inventor has discovered that it is possible to significantly increase the proportion of long mineral fibres among all the mineral fibres produced by reducing, in the proportions mentioned above, the momentum transferred by the burner 2 to the filaments at the outlet of the orifice relative to the known momentum. The pressure of the burner 2 is therefore brought to between 400 mm CE and 800 mm CE, in particular between 400 mm CE and 450 mm CE (note that 1 mm CE = 9.81 Pa).

[0039] The rotation speed may be between 1600 and 3000 revolutions per minute, in particular between 2400 and 3000 revolutions per minute.

[0040] The tangential velocity of the orifice during the rotation of the centrifuge device 1 can be between 50 m / s and 80 m / s, preferably between 57 m / s and 75 m / s. In this way, it is possible to increase the proportion of fibers having a length strictly greater than 1.5 mm, preferentially strictly greater than 2.0 mm, in the population of fibers of the article. In fact, the length of the fibers can be increased by increasing the momentum provided to the fibers from the outlet of the orifice. However, the momentum provided to the fibers by the burner can be accompanied by mechanical stresses experienced by the fibers downstream of the burner, swept away by the turbulent flow of the fluid. These stresses can lead to breakage of the fibers. The tangential velocity of the orifice thus makes it possible to reduce the mechanical stresses experienced by the fibers in a turbulent environment, while providing them with sufficient momentum.

[0041] The daily fiber production per spinner orifice is equal to the throughput of molten material passing through each orifice per day. The daily fiber production per spinner orifice can be 0.30 kg / day to 0.8 kg / day, in particular 0.4 kg / day to 0.7 kg / day.

[0042] Preferably, the fiber output per orifice may be less than 0.40 kg / day. In this way, for fibers produced at higher output, it is possible to reduce the fiber diameter, thus offsetting the effect of the reduction in momentum transferred by the burner 2 to the filaments at the orifice outlet.

[0043] The spinner of the centrifuge 2 may have at least 30,000 orifices, for example when the spinner diameter is equal to 600 mm. Preferably, the spinner of the centrifuge 2 may have at least 36,000 orifices, for example when the spinner diameter is equal to 400 mm. In this way, for a constant total production, the production per orifice is small enough to produce fine fibers, thereby offsetting the effect of the reduced transfer of momentum of the burner 2 to the filaments at the outlet of the orifices.

[0044] The spinner of the centrifuge 2 has a diameter between 50 mm and 800 mm, preferentially between 400 mm and 600 mm. The production capacity of the centrifuge 2 varies depending on the diameter of the spinner.

[0045] The orifices are formed and distributed over a drilling strip of the spinner, the height of which, along the direction of the rotation axis X of the centrifuge, is preferably less than 35 mm. The diameter of the orifices is between 0.5 and 1.1 mm.

[0046] The distance between the centers of adjacent orifices may be between 0.8 mm and 2 mm. This distance may vary by less than 10%, preferably less than 3%. The distance between the centers of adjacent orifices may decrease in the direction towards the lower part of the spinner.

[0047] The manufacturing method may then comprise a step of recovering the mineral fibres on the belt 5. Following the recovery step, the manufacturing method may comprise a step of grinding the fibres and then a step of compressing the fibres. The grinding step may be carried out to obtain an article according to one embodiment of the invention.

[0048] Structure and geometry of mineral wool

[0049] The volume weighted median diameter of the fibers may be between 5 μm and 15 μm, in particular between 6 μm and 12 μm, preferentially between 7 μm and 10 μm. In this way, the insulation article may have a thermal conductivity lower than that of known insulation articles, while making it possible to form the above-mentioned length distribution. In fact, a median diameter that is too small may promote a decrease in the proportion of long fibers in the length distribution, due to breakage of the longest fibers. The range of median diameters of the fibers of the article according to an embodiment of the invention makes it possible to avoid excessive breakage of the fibers, while maintaining a low thermal conductivity of the article.

[0050] The average fiber length, by number of fibers, can be from 0.5 mm to 1.5 mm. The median fiber length, by number of fibers, is from 300 μm to 700 μm. The barrier article can have a micronaire of from 4 L / min to 9 L / min.

[0051] The diameter and length of the fibers may be measured by depositing the fibers on a substrate and then imaging the deposited fibers under a microscope. A sample of the article or coating may be taken using tweezers. Typically, 10-30 mg of the article or coating may be removed. The number of fibers measured is more than 1000, in particular more than 2000, preferably more than 5000. The fibers of the sample may then be dispersed in a solvent. The solvent may comprise a mixture of distilled water and glycerin, for example in a ratio of 500:1, and / or may comprise a surfactant. The sample is stirred with a laboratory stirrer for 30 minutes to 2 hours, resulting in the dispersion of the fibers in the solvent. The fiber dispersion is then diluted in distilled water in a ratio of 1:3 to 1:20. The diluted fiber dispersion is then deposited on a substrate, for example on the bottom of a Petri dish. The fibers contained in the dispersion are then imaged by a microscope provided with an objective lens with a magnification equal to, for example, 20x, 40x or 90x, or by any other imaging system (camera, scanner) that allows observing the fibers with a resolution sufficient to evaluate their length. Image processing is then performed. In each image, pixel clusters smaller than a few pixels or pixel clusters with an eccentricity of less than 0.5, i.e. particles that are approximately circular, are ignored. A wire frame is then applied to each image, thereby obtaining the central axis of the fiber. And finally, a score function is used to evaluate the probability that two fiber segments belong to the same fiber. The score function is also used to reconstruct the fibers divided into fiber segments during the thresholding step.

[0052] Additives

[0053] In all embodiments of the invention, the article has a total weight percentage of one or more additives between 0.4% and 1.2%, in particular between 0.6% and 1%, preferentially between 0.7% and 0.9%. In this way, as mentioned above and in combination with the fiber length distribution described, it is possible to maximize the heat insulation of the article while limiting the release of dust during installation of the article. In fact, the additives, which usually comprise organic compounds, promote the heat transfer through the article and thus reduce the heat insulation properties provided by the blown article. In this specification, the total weight percentage of one or more additives is understood to mean all the additives of the article. The weight percentage of all additives, being additives with different properties, is calculated by adding up the weight percentages of each additive only once. This definition of the total weight percentage of one or more additives does not exclude the additive from having multiple functions. The functions may be selected at least from among the dust-proofing function, the hydrophobizing function, the antistatic function and the dye function. The weight percent of one or more additives having a given function is calculated by summing the weight percent of each additive having that given function. This definition does not prevent the weight percent of a first additive having both a first function and a second function from being summed with both the weight percent of one or more additives having the first function and the weight percent of one or more additives having the second function.

[0054] The additive(s) can be of any type. The additive(s) are preferentially chosen from anti-dust additives, hydrophobizing additives, antistatic additives and dyes.

[0055] The thermal barrier article may comprise an antistatic additive. The weight percentage of the antistatic additive may be between 0.01% and 0.30%, in particular between 0.02% and 0.20%, and preferentially between 0.05% and 0.15%.

[0056] The antistatic additive may be selected from at least tertiary ammonium, quaternary ammonium, and polyethylene glycol. Preferably, the antistatic additive comprises polyethylene glycol and at least one compound selected from tertiary ammonium and quaternary ammonium. The total weight percentage of tertiary ammonium and quaternary ammonium may be 0.01% to 0.25%, in particular 0.01% to 0.05%. The weight percentage of polyethylene glycol may be 0.03% to 0.20%, in particular 0.05% to 0.10%.

[0057] The antistatic additive can be sprayed onto the produced mineral fiber mat 4 following the previously mentioned step of forming the mineral fiber web 4 and / or following the step of milling the fibers, for example during the transport of the fibers in a pneumatic path. The antistatic additive makes it possible to increase the value of the electrostatic charge of the mineral fibers of the sprayed mineral wool. In this way, during the deposition of the coating obtained by the sprayed article on the blocked barrier, the mineral fibers do not adhere to the user's clothing. With reference to FIG. 3, the measurement of the electrostatic charge of the sprayed mineral wool can be carried out by placing a mobile electrostatic sensor (for example a sensor of the Keyence SK-050 model) at the outlet of the conduit through which the sprayed article is conveyed to the blocked barrier. This sensor measures, close to the path along which the sprayed article is conveyed, the potential difference ΔV between the potential measured when the sprayed article passes through the path and the potential measured at the same place when the sprayed article does not pass through the path. The measured potential difference is proportional to the average charge of the fibers passing through the path and varies in the same direction. The sensor may be located, for example, at the outlet of a pneumatic conduit used to deposit sprayed mineral wool onto the barrier to be blocked.

[0058] The average charge of the sprayed mineral fibers of the article can be zero or positive. In fact, the inventors have discovered that a zero or positive average charge of the sprayed fibers is a sufficient condition to observe the antistatic effect of the article on the user's clothing. "Average charge" refers to the average charge of the mineral fibers measured during spraying of the article. Figure 3 shows the average charge of the fibers as a function of relative humidity (HR) level.

[0059] The thermal insulation article may include an antistatic additive. The additive is said to be "hydrophobic" if, when deposited in the mineral wool, it enables the insulation article to have hydrophobic properties. The hydrophobic additive may be sprayed onto the mineral fiber web 4 produced following the previously described step of forming the mineral fiber web 4. The weight percentage of the hydrophobizing additive may be 0.05% to 0.4%, preferably 0.1% to 0.2%. The hydrophobizing additive may be a silicone, such as polydimethylsiloxane (PDMS).

[0060] The thermal insulation article may comprise an anti-dust additive. The anti-dust additive may be sprayed onto the mineral fibre mat 4 produced following the step of forming the mineral fibre web 4 as described above and / or following the step of grinding the fibres, for example during transport of the fibres in a pneumatic path. The anti-dust additive reduces the formation of dust during the blowing of the blown wool, thus increasing the comfort of the user and making it possible to prevent the mineral fibres from entering the airways of the 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 weight percentage of the anti-dust additive may be determined such that the article has a total weight percentage of one or more additives that is between 0.4% and 1.2%, such that the weight percentage of the anti-static additive is between 0.01% and 0.30% and such that the weight percentage of the hydrophobizing additive is between 0.05% and 0.4%. Preferably, the weight percentage of the anti-dust additive is between 0.34% and 1.14%.

[0061] Macroscopic, thermal, and dissipative properties of the barrier article

[0062] At the end of the above-mentioned method for manufacturing an article, in particular after the step of compressing the fibers, the article has a density greater than the density of the coating obtained by spraying the article. The density is greater than 100 kg m -3 ~180kg m -3 , especially 120kg m -3 ~160kg m -3 , preferentially 140 kg m -3 ~160kg m -3 This density may be the density of the packaged article, and therefore may make the article lighter when packaged than other known articles for the same volume. As an example, a known article obtained from rock wool has a density of 200 kg m -3 In this way, it is possible to facilitate the transportation of the goods to the construction site.

[0063] Another aspect of the present invention is a thermal and / or acoustic barrier coating obtained by spraying an article according to one embodiment of the present invention.

[0064] The coating, and indirectly the article, may be used for thermal and / or acoustic insulation of a building barrier. The barrier may be selected from a wall, a floor, and a ground. The barrier may be insulated by depositing the coating by spraying the article.

[0065] Preferably, the coating has a thermal conductivity of 0.45 W kg K. -1 m -4 ~0.8W kg K -1 m -4 , especially 0.5 W kg K -1 m -4 ~0.75W kg K -1 m -4 In this way, it is possible to reduce both the consumption of the article for applying the coating, whose heat resistance is predefined by the user, in particular depending on the properties of the article before spraying, and the emission of dust emitted during spraying of the article. The coating has a thermal performance coefficient χ of 35 mW m -1 ·K -1~55mW m -1 ·K -1 , especially 40 mW m -1 ·K -1 ~52mW m -1 ·K -1 , preferentially 43 mW m -1 ·K -1 ~49mW m -1 ·K -1 In addition, preferably in combination with the thermal conductivity defined above, the coating may have a thermal conductivity of 5 kg / m 3 ~18kg / m 3 , especially 7kg / m 3 ~12kg / m 3 The spray density may be:

Claims

1. A heat-insulating and / or sound-insulating article, comprising glass wool, wherein the glass wool contains mineral fibers and is suitable for spraying, and the article has the following characteristics: - The fiber population distribution is such that the median fiber length in the frequency distribution is 2 mm or less, and at least 10% by number in the population has a fiber length strictly greater than 1.5 mm, preferably strictly greater than 2.0 mm. - The article contains at least one additive, and the article has a total weight percentage of one or more of the additives of 0.4% to 1.2%, particularly 0.6% to 1%, preferably 0.7% to 0.9%. An article having the above characteristics.

2. The article has a density of 100 kg·m －３ to 180 kg·m －３ , particularly 140 kg·m －３ to 160 kg·m －３ The article according to claim 1, having such a density.

3. The article according to claim 1 or claim 2, wherein one or more of the additives include at least one additive selected from a dust-proof additive, a hydrophobizing additive, an antistatic additive, and a dye.

4. The article according to claim 3, wherein one or more of the additives include an antistatic additive, and the weight percentage of the antistatic additive is 0.01% to 0.30%, particularly 0.02% to 0.20%, preferably 0.05% to 0.15%.

5. The article according to claim 3, wherein one or more of the additives include an antistatic additive, and the antistatic additive is selected from a tertiary ammonium, a quaternary ammonium, and polyethylene glycol.

6. The article according to claim 3, wherein one or more of the additives include a hydrophobizing additive, and the weight percentage of the hydrophobizing additive is 0.05% to 0.4%.

7. The article according to claim 1 or claim 2, wherein the average length of the fibers by the number of fibers is 0.5 mm to 1.5 mm.

8. The article according to claim 1 or claim 2, wherein the volume-weighted median diameter of the fibers is 5 μm to 15 μm, particularly 6 μm to 12 μm, preferably 7 μm to 10 μm.

9. The article according to claim 1 or claim 2, wherein the median fiber length by the number of fibers is 300 μm to 700 μm.

10. After spraying, 0.45 W·kg·K －１ ·m －４ ~0.8 W·kg·K －１ ·m －４ , particularly 0.5 W·kg·K －１ ·m －４ ~0.75 W·kg·K －１ ·m －４ The article according to claim 1 or claim 2, which can have a heat performance coefficient χ of

11. The article according to claim 1 or claim 2, wherein the glass wool has a micronaire of 4 L / min to 9 L / min.

12. A heat-insulating and / or sound-insulating coating obtained by spraying the article according to claim 1 or claim 2, wherein the coating has a thermal performance coefficient χ of 0.45 W·kg·K －１ ·m －４ ~0.8 W·kg·K －１ ·m －４ , particularly 0.5 W·kg·K －１ ·m －４ ~0.75 W·kg·K －１ ·m －４ and is a heat-insulating and / or sound-insulating coating having a thermal performance coefficient χ Claim 13: A heat-insulating and / or sound-insulating coating obtained by spraying the article according to claim 1 or claim 2, wherein the coating has a spraying density of 5 kg / m ３ to 18 kg / m ３ , particularly 7 kg / m ３ to 12 kg / m ３ and is a heat-insulating and / or sound-insulating coating having a spraying density.

14. A heat-insulating and / or sound-insulating coating obtained by spraying the article according to Claim 1 or Claim 2, wherein the coating has a thermal conductivity of 35 mW·m －１ ·K －１ to 55 mW·m －１ ·K －１ , particularly 40 mW·m －１ ·K －１ to 52 mW·m －１ ·K －１ , preferably 43 mW·m －１ ·K －１ to 49 mW·m －１ ·K －１ ; a heat-insulating and / or sound-insulating coating having heat conductivity.

15. Use of the article according to claim 1 or claim 2 for heat insulation and / or sound insulation of building barriers.

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