Thermally insulating coating for buildings obtained with a chemical compound and its method of application

Abstract

Chemical compound for a thermally insulating coating for construction, in particular of the wall screed type, comprising from 40 to 90 parts by weight of granular inert material; and from 20 to 40 parts by weight of nesosilicate, such as for example zirconium silicate, olivine and / or cyanite; from 8 to 15 parts by weight of alkali metal silicate, such as for example potassium, lithium and / or sodium silicate; from 6 to 14 parts by weight of titanium group metal dioxide, such as for example titanium dioxide and / or zirconium; and binder.

Description

[0001] "THERMALLY INSULATING COATING FOR BUILDINGS OBTAINED WITH A

[0002] CHEMICAL COMPOUND AND ITS METHOD OF APPLICATION"

[0003] TECHNICAL FIELD

[0004]

[0001] . The object of the present invention is a chemical compound for making thermal insulation in the construction sector.

[0005]

[0002] . I n particular, the compound according to the invention is particularly suitable for making screeds for walls and masonry.

[0006]

[0003] . The present invention also refers to a thermally insulating coating obtained with said compound.

[0007]

[0004] . Furthermore, the present invention discloses a method for laying said coating.

[0008] STATE OF THE ART

[0009]

[0005] . The thermal insulation of a property, such as a house or a room of other type, allows considerable savings on consumption as well as on management costs, because it makes it possible to reduce or even eliminate the need to resort to air conditioning, as well as to heating systems, for the room.

[0010]

[0006] . The use of materials with low thermal conductivity in the construction sector is widespread, and in particular for the coating of vertical masonry walls, floors and roofs.

[0011]

[0007] , I n the construction sector, thermally insulating roofs are generally known, such as so-called thermal coats, which are typically made by means of panels to be applied to the masonry surface to be treated. Such known panels may comprise mineral wool, expanded polyurethane or expanded polystyrene (EPS) and their thickness is typically regulated in order to obtain a given thermal transmittance (unit of measure: W / m2K) . Typically, such thermal overcoat panels have a thickness of about 100-250 millimetres.

[0012]

[0008] . For example, known thermal overcoat panels in expanded polystyrene (EPS) or rock wool have a thermal conductivity of about 0.04 W / m K. I nstead, ordinary concrete typically has a thermal conductivity of about 1.6 W / m K, and lime-cement plaster usually has a thermal conductivity of about 1.0 W / m K.

[0013]

[0009] . I n particular, where the thermal overcoat is to be installed on the masonry walls of an internal room of a house or other property, there is a clear decrease in the useful living volume of the room due to the space occupied by the panels superimposed on the vertical masonry walls. After coating the masonry surface with the panels, they are covered with plaster. I n some known examples, an insulating foam subsequently coated with plaster is utilized instead of the panels.

[0014]

[0010] . A further critical issue derives from the difficult installation of the panels, which must require precise gluing of the panels side by side. I n fact, undesirable swellings of the panels themselves can be often observed downstream of the installation.

[0015]

[0011] . I n addition, these thermal overcoat panels are typically waterproof, being poorly breathable, that is, they prevent the passage of water and air, consequently facilitating the formation and development of mould and condensation inside the rooms. I n the construction sector, breathable decorative paints based on silicates (also known as mineral colours) are also known, which are used for example in the restoration of historic buildings.

[0016]

[0012] , In addition, it is not uncommon for these thermal overcoat panels to be flammable.

[0017]

[0013] . The need is therefore felt to propose an improved solution of thermal insulating coating for the construction, capable of reducing the invasiveness of the coating in terms of the volume of space occupied by the thermal insulating coating, and at the same time being able to provide improved operating performance.

[0018] SUMMARY OF TH E I NVENTION

[0019]

[0014] . The object of the present invention is therefore to propose a solution that meets the needs that are lacking with reference to the prior art.

[0020]

[0015] . This and other objects are achieved with a compound according to Claim 1 , as well as with a coating according to Claim 7, as well as with a method according to Claim 10.

[0021]

[0016] . Some advantageous embodiments are the subject-matter of the dependent claims.

[0022]

[0017] . According to one aspect of the invention, a chemical composition for a thermally insulating coating for construction, in particular of the wall screed type, comprises from 40 to 90 parts by weight of granular inert material; and from 20 to 40 parts by weight of nesosilicate; and from 8 to 15 parts by weight of alkali metal silicate; and from 6 to 14 parts by weight of titanium group metal dioxide, and binder.

[0023]

[0018] . Preferably, said nesosilicate consists of zirconium silicate, and said alkali metal silicate consists of potassium silicate, and said titanium group metal dioxide consists of titanium dioxide.

[0024]

[0019] . I n accordance with one embodiment, the granular inert material comprises expanded cellular glass, and in particular from 30 to 50 parts by weight. The particle size is preferably controlled. The granular inert material preferably also comprises expanded silica and / or expanded perlite, and in particular from 10 to 40 parts by weight, with a particle size of about 0.2 millimetres.

[0025]

[0020] . According to one aspect of the invention, a thermal insulating coating for masonry works comprises at least one layer of wall screed obtained by applying at least one layer of said chemical compound.

[0026]

[0021] . The thickness of the at least one chemical layer is preferably in the order of a few millimetres.

[0027]

[0022] . Thanks to the solutions proposed, it is possible to create a thermally insulating and at the same time breathable and refractory plaster.

[0028] DETAI LED DESCRI PTION OF CERTAI N EM BODI M ENTS

[0029]

[0023] . In accordance with a general embodiment, a chemical compound for a thermally insulating coating is provided.

[0030]

[0024] . The thermally insulating coating, obtained with said chemical compound, is designed for applications in the construction sector, in particular of the wall screed type. I n other words, the thermally insulating coating is preferably a thermally insulating plaster suitable for installation on vertical walls of a building, such as for example a house for civil use.

[0031]

[0025] . The thermally insulating coating is suitable, if necessary, both for laying on the inner walls of a room of a building and on the outer walls of the building.

[0032]

[0026] . The thermally insulating coating can be laid on a floor or on a roof.

[0033]

[0027] . The chemical compound comprises at least: granular inert material, and nesosilicate, and alkali metal silicate, and titanium group metal dioxide, and binder.

[0028] . The granular inert material, such as for example expanded cellular glass and / or expanded perlite and / or expanded silica, having low thermal conductivity imparts to the chemical compound and to the obtained thermally insulating coating properties of high thermal insulation.

[0034]

[0029] . I n addition, the granular inert material, such as for example expanded cellular glass and / or expanded perlite and / or expanded silica, makes the chemical compound and the obtained thermally insulating coating spreadable i.e. easy to lay.

[0035]

[0030] . The choice of the particle size of the granular inert material may determine the thickness of the thermally insulating coating layer obtained from the chemical compound being laid. For example, a finer particle size allows thinner layers to be laid.

[0036]

[0031] . The particle size of the granular inert material can vary strongly within the same chemical compound.

[0037]

[0032] . I n accordance with a preferred embodiment, the granular inert material comprises expanded cellular glass, and in particular from 30 to 50 parts by weight of the chemical compound. I n accordance with one embodiment, the expanded cellular glass has a particle size in the range 0.2 / 0.5 millimetres. I n accordance with another embodiment, the expanded cellular glass has a particle size in the range 2 / 4 millimetres.

[0038]

[0033] . Providing grains in a relatively narrow range of particle size allows a homogeneous compound to be obtained.

[0039]

[0034] , I n accordance with a preferred embodiment, in addition to or as an alternative to the expanded granular glass, the granular inert material comprises expanded perlite and / or expanded silica. I n particular, the compound comprises from 30 to 50 parts by weight of perlite and / or expanded silica.

[0035] . Preferably, the perlite and / or expanded silica is provided in addition to the expanded granular glass, and in particular in accordance with the respective portions indicated above.

[0040]

[0036] . The chemical compound preferably comprises from 20 to 40 parts by weight of said nesosilicate.

[0041]

[0037] , I n accordance with a preferred embodiment, the nesosilicate consists of zircon (zirconium silicate). Alternatively or additionally, the nesosilicate belongs to the olivine group, i.e. it is an olivine, i.e. a magnesium and / or manganese and / or iron silicate. Alternatively or additionally, the nesosilicate is kyanite i.e. it is an aluminium silicate.

[0042]

[0038] . The provision of the nesosilicate, and in particular in its indicated portion, allows thermal stability to be conferred to the chemical compound, with a resulting refractory effect on the thermally insulating coating obtained.

[0039] . The chemical compound preferably comprises from 6 to 14 parts by weight of titanium group metal dioxide.

[0043]

[0040] . Said titanium group metal dioxide is preferably titanium dioxide. Alternatively or in addition, said titanium group metal dioxide is zirconium dioxide.

[0044]

[0041] . The provision of said titanium dioxide and / or zirconium , in particular in its indicated portion, makes it possible to confer reflective properties to the chemical compound and consequently to the thermally insulating coating obtained. I n fact, such titanium dioxide and / or zirconium typically occurs as a white, reflective pigment.

[0045]

[0042] , I n accordance with an embodiment, the titanium dioxide and / or zirconium makes it possible to provide self-cleaning characteristics to the thermally insulating coating when exposed to direct sunlight.

[0046]

[0043] . The joint provision of zircon (zirconium silicate) and titanium dioxide, in the respective parts indicated, makes it possible to obtain a refractory and reflective synergistic effect of amplified effectiveness.

[0047]

[0044] . The chemical compound preferably comprises from 8 to 15 parts by weight of alkali metal silicate.

[0048]

[0045] . The alkali metal silicate preferably consists of potassium silicate. As an alternative or in addition to potassium silicate, said alkali metal silicate may be lithium silicate and / or sodium silicate.

[0049]

[0046] . The provision of said alkali metal silicate in the chemical compound, and in particular provided for in its previously indicated portion, makes it possible to provide breathability characteristics to the chemical compound and consequently to the thermally insulating coating obtained. The breathability provided makes it possible to obtain a thermally insulating coating that is certainly not impermeable to water vapour and humidity in general, thus allowing to prevent the formation of mould and condensation on the masonry wall even over a rather long period of time.

[0050]

[0047] , I n accordance with one embodiment, the binder is provided from 45 to 95 parts by weight of the compound.

[0051]

[0048] . Said binder may comprise natural and / or synthetic resin, for example it comprises both natural resin and synthetic resin.

[0052]

[0049] . The part by weight of said synthetic resin, for example acrylic resin, of the binder is preferably less than the part by weight of said alkali metal silicate (potassium silicate, for example) , so as not to reduce breathability. The binder may comprise acrylic dispersions in addition to the resin.

[0053]

[0050] . I n accordance with one embodiment, the compound further comprises a thickener, such as for example corn starch, and / or cellulose, and / or zinc stearate, and / or acrylic thickener. Said thickener is preferably hydrophilic thickener. The thickener may comprise acrylic resin or another synthetic resin with thickening property.

[0054]

[0051] , I n accordance with a preferred embodiment, the chemical compound comprises 30-50 kilograms of expanded cellular glass, and 10-40 kilograms of silica and / or expanded perlite, and 20-40 kilograms of zirconium (zircon) silicate, and 6- 14 kilograms of titanium dioxide, and 8-15 kilograms of potassium silicate. Preferably, 30-60 kilograms of acrylic dispersions and 15- 35 kilograms of resin are also provided to act as a binder. Thickeners may also be provided, and in particular: 4- 10 kilograms of corn starch, and 6- 10 kilograms of zinc stearate, and 2-8 kilograms of cellulose, and 0.5-2 kilograms of Acrysol type thickener.

[0055]

[0052] . The joint use in the compound of expanded cellular glass, expanded silica / perlite, zirconium silicate, titanium dioxide, and potassium silicate, and in particular when provided for in the indicated portions, make it possible to obtain a chemical compound, and consequently a thermally insulating coating, with high thermal insulation properties even in the case of minimum thicknesses, such as for example laying thicknesses of the order of a few millimetres.

[0056]

[0053] . The compound obtained is applicable, that is, it can be laid in a simple way using common tools such as a common spatula and is of such consistency as to be easy to spread.

[0057]

[0054] . I n accordance with a preferred embodiment, the application or laying of the chemical compound to obtain a thermal insulating coating takes place according to a plurality of layers each having a thickness of 1 - 16 millimetres.

[0055] . In accordance with a general embodiment, a thermal insulating coating for masonry works comprises at least one layer of wall screed obtained by applying at least one layer of a chemical compound according to any one of the embodiments described above.

[0056] . The thermal insulating coating may comprise a plurality of superimposed layers of wall screed, each layer being obtained by applying at least one layer of said chemical compound. I n accordance with an embodiment, each layer has a thickness belonging to the range 1 -16 millimetres, and preferably 2-16 millimetres, and even more preferably about 2-3 millimetres.

[0058]

[0057] . Accordingly, a method for laying a thermal insulating coating for masonry works comprises the steps of laying on the wall a first layer of wall screed obtained by applying a layer of a chemical compound according to any one of the embodiments described above, and laying, on the first dried layer, a second layer of said wall screed.

[0059]

[0058] . Between the step of laying the first layer and the step of laying the second layer, the method preferably comprises the further step of waiting for the first laid layer to dry.

[0060]

[0059] . The method therefore makes it possible to make a thermally multilayer coating having at least two layers but also more than two layers of said chemical compound.

[0061]

[0060] . The method may further comprise the step of painting the laid thermally insulating coating with breathable paint, for example based on potassium silicate.

[0062]

[0061] . Thanks to the proposed solutions, a compound is provided that can be applied on one or more layers. Each layer can have a thickness of about 1 -5 millimetres and can be applied after the drying of the layer previously applied on the masonry wall to be coated.

[0063]

[0062] . Thanks to the proposed solutions, it is possible to reduce the thickness of thermal insulating coating to be applied to a masonry wall, with the same transmittance value, compared to known solutions, mitigating the invasiveness of the coating.

[0064]

[0063] . For example, the thickness of the thermally insulating coating may be less than 50 millimetres, and preferably less than 25 millimetres, and even more preferably the thickness of the coating belongs to the range 4-18 millimetres.

[0065]

[0064] . Thanks to the proposed solutions, the formation of mould and condensation is prevented and a breathable thermal insulating coating is made available.

[0066]

[0065] . Thanks to the proposed solutions, flammability is reduced and a refractory thermal insulating coating can be provided.

[0067]

[0066] . I n particular, the formation of mould and condensation is eliminated thanks to a compound having at the same time thermally insulating materials and refractory materials.

[0068]

[0067] , It is understood however that what is described above has an exemplary and non-limiting purpose, therefore, possible variants of detail that may be necessary for technical and / or functional reasons, are considered from now falling within the same protective scope defined by the claims indicated below.

Claims

CLAI MS1 . Chemical compound for a thermally insulating coating for construction, in particular of the wall screed type, comprising, on 100 parts by weight of compound:-from 40 to 90 parts of granular inert material;- from 20 to 40 parts of nesosilicate, such as for example zirconium silicate, olivine and / or kyanite;-from 8 to 15 parts of alkali metal silicate such as for example potassium, lithium and / or sodium silicate;- 6 to 14 parts of titanium group metal dioxide, such as for example titanium dioxide and / or zirconium; and- binder.

2. Compound according to Claim 1 , wherein:- said nesosilicate consists of zirconium silicate, and- said alkali metal silicate consists of potassium silicate, and- said titanium group metal dioxide consists of titanium dioxide.

3. Compound according to Claim 1 or 2, wherein said binder comprises synthetic resin, for example acrylic resin, and the part by weight of said synthetic resin of the binder is less than the part by weight of said alkali metal silicate.

4. Compound according to any one of the preceding claims, wherein the binder is provided in an amount of from 45 to 95 parts on 100 parts by weight of the compound.

5. Compound according to any one of the preceding claims, wherein the granular inert material comprises expanded cellular glass, and in particular from 30 to 50 parts of expandedcellular glass on 100 parts by weight of the compound; and wherein, preferably, the expanded cellular glass has a particle size belonging to the range 0.2 / 5 millimetres; and / or wherein the expanded cellular glass has a particle size belonging to the range 0.2 / 0.5 millimetres and / or to the range 2 / 4 millimetres.

6. Compound according to any one of the preceding claims, wherein the granular inert material comprises expanded silica and / or expanded perlite, and in particular from 10 to 40 parts of expanded silica and / or expanded perlite on 100 parts by weight of the compound; and wherein, preferably, said silica and / or expanded perlite has a particle size of about 0.2 millimetres.

7. Compound according to any one of the preceding claims, further comprising thickener, such as for example corn starch, and / or cellulose, and / or zinc stearate, and / or acrylic thickener.

8. Thermal insulating coating for masonry works comprising at least one layer of wall screed obtained by applying at least one layer of a chemical compound according to any one of the preceding claims.

9. Thermal insulating coating according to Claim 8, comprising a plurality of superimposed layers of wall screed, each layer being obtained by applying at least one layer of said chemical compound; and wherein, preferably, each layer has a thickness belonging to the range 1-16 millimetres, and preferably about 2-3 millimetres.

10. Method for installing a thermal insulating coating for masonry works comprising the steps of:- laying on the wall a first layer of wall screed obtained by applying a layer of a chemical compound according to any one of Claims 1 to 7;- waiting for the first laid layer to dry;- laying, on the first dried layer, a second layer of said wall screed.