Classifications

• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
  • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
  • C04B28/04—Portland cements
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
  • C04B14/02—Granular materials, e.g. microballoons
  • C04B14/022—Carbon
  • C04B14/024—Graphite
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
  • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
  • C04B28/06—Aluminous cements
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
  • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
  • C04B28/06—Aluminous cements
  • C04B28/065—Calcium aluminosulfate cements, e.g. cements hydrating into ettringite
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
  • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
  • C04B28/08—Slag cements
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
  • C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
  • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
  • C04B2111/00663—Uses not provided for elsewhere in C04B2111/00 as filling material for cavities or the like
  • C04B2111/00672—Pointing or jointing materials

Definitions

• the present invention belongs to the field of mortars based on mineral binders.
• mineral binder we mean, where appropriate, collectively, a mixture of several mineral binders.
• dry (mortar) composition or “dry mortar” is meant a powdery mixture in which the mineral binder and any aggregates and/or additives are in the form of powders and grains. After mixing with water, or the so-called mixing stage, we obtain a paste, or wet mortar, which can be placed on a substrate.
• the invention relates more particularly to adhesive mortars for tile adhesives.
• the wet mortar is deposited on a substrate in order to ensure the fixing of the tiles to the latter.
• Clip-on tiles applied without any adhesive composition, are available commercially. However, although easily applied, this type of tiling remains expensive and requires a smooth floor. It is also not suitable for use on walls. According to users, its use is also complicated during cutting and possible repairs; it would also be less resistant than usual tiles.
• adhesion can be degraded by different types of stimuli such as thermal (by heating or cooling), electrical, radiative, mechanical or enzymatic.
• Patent application EP0994222 Al describes a method of disassembling tiles on a bed of mortar, carried out flat and requiring a high heating ramp.
• the disassembly here comes from the expansion of the tiles under the effect of the temperature gradient between the tiles and the mortar. This method, however, requires a specific device, which once again complicates its implementation by a user.
• the present invention aims to remedy all or part of the drawbacks of the prior art, in particular those set out above, by proposing a solution which makes it possible to degrade the adhesion properties of a mortar in order to achieve easy disassembly, for example, of tiles.
• the invention relates to a dry mortar composition, in particular adhesive mortar for tile adhesive, comprising a mineral binder and at least one thermally expandable material.
• Such a composition according to the invention finds its interest, in particular, in the fact that it allows expansion of the thermally expandable material, and therefore of the dry mortar under the effect of heating, said expansion leading to mechanical stress within the mortar, until it ruptures. Rupture under the effect of heating is therefore caused at lower temperatures than for mortars of the prior art.
• thermally expandable materials are known, in particular in the form of thermally expandable particles, thermally expandable graphite or thermally expandable clays.
• the thermally expandable particles have a thermoplastic shell containing hydrocarbons. When heated, the softening of the shell combined with the vaporization of the hydrocarbon core leads to an expansion in the volume of the particles.
• the thermally expandable material is a thermally expandable graphite.
• Thermally expandable graphite is known for its use as a flame retardant and in particular described in “Expandable graphite as an intumescent flame retardant in polyisocyanurate-polyurethane foams” by M. Modesti et al. in Polymer Degradation and Stability, vol. 77, no. 2, pp. 195-202 in 2002.
• molecules generally containing sulfur, such as hydrogen sulfate ions or sulfuric acid, are interposed between the layers of graphite. During heating, the transition to the gaseous state of these molecules causes an accordion-like expansion of the graphite sheets.
• Different thermally expandable graphites are commercially available and can exhibit variable expansion in volume and temperature at which this is triggered. This temperature can be at least 110°C.
• a thermally expandable graphite suitable for the invention can be chosen from the GrafGuard range marketed by the company NeoGraf, the references EG-110-230 and EG-180-250 marketed by the company ACS Materials, 808121 by the company Sigma -Aldrich or Blahgraphit by the company AMG Graphite GK.
• the thermally expandable graphite used in a composition according to the invention is the Blahgraphit reference graphite marketed by the company AMG Graphite GK.
• the thermally expandable graphite may be present in a composition according to the invention in a content of from 0.3% to 10% by weight, in particular from 0.4% to 7% by weight and preferably from 0. 5% to 5% by weight, relative to the total weight of the composition.
• a low thermally expandable graphite content that is to say less than 0.3% by weight, in particular less than 0.4% by weight and preferably less at 0.5% by weight relative to the total weight of a composition according to the invention, complicates the disassembly operation because it requires a longer heating time and a higher energy expenditure.
• a high thermally expandable graphite content that is to say greater than 10% by weight, in particular greater than 7% by weight and preferably greater than 5% by weight relative to the total weight. of a composition according to the invention, can compromise the adhesion properties of said composition.
• the mineral binder in a composition according to the invention may be a hydraulic binder.
• the hydraulic binder is chosen from Portland cements, in particular of the CEM I or CEM II type, belitic cements, aluminous cements, sulfoaluminous cements, pozzolanic mixture cements, hydrated lime, slags, metakaolins, fly ash, calcium sulfate sources and mixtures of two or more of these binders.
• a CEM I cement comprises at least 95% by weight of clinker, while a CEM II cement comprises at least 65% by weight of clinker and at most 35% by weight of at least one of the following compounds: high-grade slag furnace, silica fume, pozzolan, fly ash, calcined shale and limestone.
• a CEM II cement may be preferred due to its lower carbon footprint.
• a slag is a by-product of an industrial process involving the fusion of a starting material, a fusion intended to separate metals from an oxide phase, the latter being called “slag”.
• the use of slag makes it possible to reduce the carbon footprint of the composition, and therefore of the process, compared to the use of cement.
• the slag can be granulated, in the sense that it has undergone thermal quenching with water resulting in grains which are generally predominantly amorphous. The granulated slag is then crushed to make it more active.
• the slag in a composition according to the invention is therefore a ground granulated slag.
• the slag is a ground granulated blast furnace slag.
• a slag used as a binder, has the advantage of being insensitive to external sulfate attack.
• the slag (in particular ground granulated blast furnace slag) is preferably activated.
• the binder then comprises, in addition to the slag, an activator.
• activator is meant here an activating compound (which improves the setting and/or hardening of the slag) or, collectively, a mixture of such compounds.
• the total proportion of activator in the binder is preferably between 1 and 20%, especially between 2 and 15% by weight.
• the activator is preferably chosen from the group formed by: bases (in particular alkali metal hydroxides, alkali metal silicates and alkali metal carbonates); phosphates, in particular salts derived from phosphoric acid such as alkali metal polyphosphates, in particular chosen from sodium, potassium and/or lithium, for example sodium tripolyphosphate; slag microparticles with a fineness greater than or equal to 6000 Blaine; microparticles of calcium and/or magnesium carbonate, calcium silicate hydrates or aluminum silicate hydrates; crushed granulated aluminous slags; sources of calcium sulfate (notably gypsum, hemihydrate or anhydrite); sulfates, halides, nitrates or carboxylates of alkali metals; Portland cement; lime; and mixtures of two or more of these compounds.
• bases in particular alkali metal hydroxides, alkali metal silicates and alkali metal carbonates
• phosphates in particular
• the activator comprises microparticles of slag with a fineness greater than or equal to 6000 Blaine, in particular between 6000 and 15000 Blaine, in a content of 1 to 35%, in particular 5 at 15%, relative to the total weight of binder.
• the activator may also comprise at least one of the following compounds: a base, in particular chosen from hydroxides, carbonates and silicates, of alkali and/or alkaline earth metals, in a total content of at most 1%, in particular included from 0.2 to 0.4%, relative to the total weight of binder; a source of calcium sulfate; alkali metal sulfates, in a total content of not more than 1%, in particular between 0.2 and 0.4%, relative to the total weight of binder; Portland cement, an aluminous cement or a sulphoaluminous cement, in a total content of not more than 4% relative to the total weight of binder.
• a base in particular chosen from hydroxides, carbonates and silicates, of alkali and/or alkaline earth metals, in a total content of at most 1%, in particular included from 0.2 to 0.4%, relative to the total weight of binder
• a source of calcium sulfate alkali metal sulfates, in
• the activator comprises microparticles of calcium and/or magnesium carbonate, calcium silicate hydrates or aluminum silicate hydrates, whose specific surface area BET ( nitrogen) is greater than 1 m 2 /g and the average diameter is less than 5 pm.
• the activator may also comprise at least one of the following compounds: a base, in particular chosen from hydroxides, carbonates and silicates, of alkali and/or alkaline earth metals, in a total content of at most 1%, in particular included from 0.2 to 0.4%, relative to the total weight of binder; a source of calcium sulfate; alkali metal sulfates, in a total content of at most 1%, in particular between 0.2 and 0.4%, relative to the weight of binder; calcium nitrate, calcium formate, Portland cement, a aluminous cement or a sulfoaluminous cement, in a total content of at most 5% relative to the total weight of binder.
• a base in particular chosen from hydroxides, carbonates and silicates, of alkali and/or alkaline earth metals, in a total content of at most 1%, in particular included from 0.2 to 0.4%, relative to the total weight of binder
• a source of calcium sulfate alkali
• the activator comprises a ground granulated aluminous slag, in particular whose chemical composition comprises from 30 to 60% by weight of alumina, from 5 to 25% by weight of silica and 20 to 40% by weight of lime, alumina being the most abundant constituent.
• the ground granulated aluminous slag preferably comes from recycling by total fusion of catalysts used for the desulfurization of petroleum products, in particular catalysts based on molybdenum and/or cobalt.
• the activator may further comprise at least one of the following compounds: a base, in particular chosen from hydroxides, carbonates and silicates, of alkali and/or alkaline earth metals, in a total content of at most 2% relative to the total weight of binder; a source of calcium sulfate; alkali metal sulfates, in a total content of at most 2% relative to the total weight of binder; Portland cement, an aluminous cement or a sulfoaluminous cement, in a total content of not more than 2% relative to the total weight of binder.
• a base in particular chosen from hydroxides, carbonates and silicates, of alkali and/or alkaline earth metals, in a total content of at most 2% relative to the total weight of binder
• a source of calcium sulfate alkali metal sulfates, in a total content of at most 2% relative to the total weight of binder
• Portland cement an aluminous cement or a sulf
• a dry mortar composition according to the invention comprises a Portland cement as a mineral binder, in particular in a content of 10% to 50% by weight and preferably comprised from 20% to 40% by weight relative to the total weight of the composition.
• the mineral binder is a binder comprising, in particular consisting of, Portland cement, aluminous cement and a source of calcium sulfate. We then speak of a ternary binder.
• the source of calcium sulfate can be chosen from gypsum, calcium sulfate hemihydrate, calcium sulfate anhydrite and mixtures thereof, and preferably the source of calcium sulfate is a mixture of calcium sulfate hemihydrate and calcium sulfate anhydrite.
• the Portland cement can be present in a content of 2% to 10% by weight, in particular 3% to 9% by weight and preferably 5%. at 8% by weight relative to the total weight of the composition.
• the aluminous cement can be present in a content of 10% to 25% by weight, and preferably 15% to 20% by weight relative to the total weight. of the composition.
• the source of calcium sulfate can be present in a content of 2% to 10% by weight, in particular of 4% to 9% by weight and preferably 6% to 8.5% by weight, relative to the total weight of the composition.
• a composition according to the invention may comprise at least one of the following characteristics: a) the Portland cement is present in a content of 2% to 10% by weight, in particular from 3% to 9% by weight and preferably from 5% to 8% by weight relative to the total weight of the composition, b) the aluminous cement is present in a content of from 10% to 25% by weight, and preferably from 15% to 20% by weight relative to the total weight of the composition, and/or c) the source of calcium sulfate may be present in a content of from 2% to 10% by weight, in particular of 4% to 9% by weight and preferably 6% to 8.5% by weight, relative to the total weight of the composition.
• the aluminous cement can be present in a content of 30% to 60% by weight, and preferably of 35% to 55% by weight, relative to the total weight of the composition.
• the Portland cement can be present in a content of 10% to 25% by weight, in particular 11% to 23% by weight, and preferably 12 % to 20% by weight relative to the total weight of the composition.
• the source of calcium sulfate can be present in a content of from 10% to 30% by weight, in particular from 11% to 27% by weight and preferably from 15% to 25% by weight, relative to the total weight of the composition.
• a composition according to the invention may comprise at least one of the following characteristics: a) the aluminous cement is present in a content of 30% to 60% by weight, and preferably from 35% to 55% by weight, relative to the total weight of the composition, b) the Portland cement is present in a content of from 10% to 25% by weight, in particular from 11% to 23% by weight, and preferably from 12% to 20% by weight relative to the total weight of the composition, and/or c) the source of calcium sulfate is present in a content of 10% to 30% by weight, in particular 11% to 27% by weight and preferably 15% to 25% by weight, relative to the total weight of the composition.
• a composition according to the invention may contain at most 0.1% by weight of aggregates, in particular it may contain less than 0.01% aggregates, relative to to the total weight of the composition, and preferably, the composition according to the invention can be devoid of aggregates.
• This second alternative is particularly interesting in terms of adhesion properties but also because it allows even faster disassembly while heating at a lower temperature as demonstrated in the examples below.
• a composition according to the invention may also comprise fillers, fillers, sand and/or aggregates.
• the fillers may be low density, mineral or organic lightening fillers such as expanded perlite, expanded vermiculite, expanded glass beads, hollow glass microspheres, cenospheres, expanded clays, expanded schists, pumice stones, expanded polystyrene.
• the fillers are conventionally of the dolomitic, siliceous, calcareous and/or silico-limestone type and have a particle size of up to 150 ⁇ m.
• the aggregates or sands whose particle size varies between 100 pm and 5 mm make it possible to influence the thickness, hardness, final appearance and permeability of the composition according to the invention.
• a composition according to the invention may also comprise at least one accelerator and/or at least one retarder.
• the total content of the accelerator(s) and the retarder(s) is preferably between 0.001% and 1.0% by weight relative to the total weight of the composition.
• a composition according to the invention advantageously comprises both at least one accelerator and at least one retarder, so as to control both the setting and the hardening of the cement.
• the accelerators suitable for the invention are for example alkaline salts such as lithium or potassium sulfates and carbonates, or organic salts such as calcium formate.
• the total content of accelerator(s) in a composition according to the invention is preferably between 0.001% and 0.1% by weight relative to the total weight of the composition.
• the retarders suitable for the invention are for example carboxylic acids such as tartaric or citric acids, and their salts.
• the total content of retarder(s) in a composition according to the invention is between 0.01% and 1.0% by weight relative to the total weight of the composition.
• a composition according to the invention may further comprise at least one other additive chosen from rheological agents such as plasticizers and superplasticizers; biocidal protection agents; redispersible polymer powders; water retaining agents; air entraining agents; thickening agents; dispersing agents and pigments.
• rheological agents such as plasticizers and superplasticizers
• biocidal protection agents such as biocidal protection agents; redispersible polymer powders; water retaining agents; air entraining agents; thickening agents; dispersing agents and pigments.
• the thickening agents and water-retaining agents suitable for the invention are for example cellulose ethers and starch ethers. They can be included in a composition according to the invention in a content of 0.05% to 0.10% by weight relative to the total weight of the composition.
• the redispersible polymer powders suitable for the invention are for example polymer powders obtained from at least one monomer chosen from vinyl esters (in particular vinyl esters of carboxylic acids, branched or not, comprising from 1 to 15 carbon atoms), (meth)acrylates (in particular (meth)acrylates of alcohols comprising from 1 to 10 carbon atoms), (meth)acrylic acids, aromatic vinyls, alkenes such as ethylene or propylene, dienes and vinyl halides.
• vinyl esters in particular vinyl esters of carboxylic acids, branched or not, comprising from 1 to 15 carbon atoms
• (meth)acrylates in particular (meth)acrylates of alcohols comprising from 1 to 10 carbon atoms
• (meth)acrylic acids aromatic vinyls, alkenes such as ethylene or propylene, dienes and vinyl halides.
• the redispersible polymer powders suitable for the invention are chosen from polymer powders obtained from at least two of the monomers mentioned above, preferably from powders of copolymers chosen from: acetate copolymers of vinyl-ethylene, vinyl ester-ethylene-vinyl chloride copolymers, vinyl acetate copolymers, vinyl acetate-acrylate copolymers, copolymers of methyl methacrylate with n-butyl acrylate and/or acrylate 2-ethylhexyl, methyl methacrylate copolymers with 1,3-butadiene, vinyl chloride-ethylene copolymers, vinyl chloride-acrylate copolymers, styrene-butadiene copolymers, styrene-acrylate copolymers, vinyl acetate-acid (meth) terpolymers acrylic-ethylene.
• copolymers chosen from: acetate copolymers of vinyl-ethylene, vinyl ester-ethylene-vinyl chloride cop
• the content of redispersible polymer powders in a composition according to the invention is preferably between 0.2% and 2.0% by weight, relative to the total weight of the composition.
• a composition according to the invention may comprise at least one additive chosen from retarders; accelerators such as calcium formate; rheological agents such as plasticizers and superplasticizers; biocidal protection agents; redispersible polymer powders such as polymer powders obtained from at least one monomer chosen from vinyl esters, (meth)acrylates, (meth)acrylic acids, aromatic vinyls, alkenes, dienes and vinyl halides; water retaining agents; air entraining agents; thickening agents such as cellulose ethers and starch ethers; the dispersing agents and the pigments, in particular the additive(s) is (are) present in a content of 0.01% to 6% by weight and preferably 0.1% to 4% by weight. weight relative to the total weight of the composition.
• the adhesives thus obtained exhibit very satisfactory short-term hardening (i.e. after 24 hours).
• the performance in terms of adhesion strength of the adhesives according to the present invention meets the specifications allowing it to be classified at least Cl, preferably C2, according to standard EN 12004:2007.
• the present invention also relates, according to a second aspect, to a method of fixing a tile to a substrate comprising successively: a) mixing the dry composition according to the invention with water so as to obtaining a wet mortar, b) applying the wet mortar to said substrate, and c) applying the tiles of said tiling to said substrate.
• a quantity of water comprised from 15% to 40% by weight, and preferably from 20% to 35% by weight, relative to the total weight wet mortar is introduced into the mixture from step a).
• the present invention also relates to a method of disassembling a tile obtained according to a fixing method according to the invention, comprising a step of heating the mortar to a temperature of between 80°C and 300°C, in particularly from 85°C to 250°C, and preferably from 90°C to 225°C, said heating step being carried out in particular by means of a heat gun, microwaves or by induction.
• Tile adhesive formulations comprising a mineral binder and a thermally expandable material were prepared by mixing the different constituents according to Table 1 below, where the compounds constituting the different compositions used are detailed, in percentage in weight according to the total weight of the dry composition, and concerning the quantity of water added, as a percentage by weight relative to the total weight of the final composition.
• the dough is then mixed again for 1 minute at a speed of 800 revolutions per minute.
• the remains of the mortar composition can be completely removed by continuing to heat the concrete slab and/or the tiling tile. When these remains are heated, the expansion of the graphite continues.
• the mortar thus heated can be easily removed after 2 minutes of heating using a heat gun placed 10 cm from it, or after a shorter time if the heat gun is placed at a shorter distance. 10 cm from the mortar. At the end of this heating, the mortar no longer has any adhesion properties.
• the comparative example could not give rise to disassembly and thus it was not possible to recover the tile by hand at the end of the test.
• Adhesion tests were carried out after 28 days according to standard EN 12004:2017, at room temperature and after the action of heat, that is to say heating to 70°C.
• compositions of examples 1 and 2 according to the invention have at least satisfactory adhesion at room temperature, that is to say a tensile adhesion of at least 0.5 MPa, corresponding to an adhesive mortar.
• CL class
• Example 1 also has an adhesion after heating of at least 0.5 MPa, satisfactory for a class CL adhesive mortar.
• Example 1 Comparison of Example 1 and the comparative example, of similar composition but devoid of thermally expandable material, demonstrates that a composition according to the invention, containing a thermally expandable material, retains adhesion properties to the less equal to those of a comparable composition devoid of such a material, while allowing easy disassembly.
• Example 5 demonstrates that a composition containing a lower content of thermally expandable material still makes it possible to obtain disassembly of a tiling tile while retaining interesting adhesion properties. Such a composition is of interest in that it makes it possible to reduce the cost of the dry mortar composition.
• All the compositions of the examples according to the invention have at least satisfactory adhesion at room temperature, that is to say a tensile adhesion of at least 0.5 MPa, corresponding to a class adhesive mortar. Cl.
• the compositions of Examples 3, 4 and 5 even have satisfactory adhesion at room temperature for a class C2 adhesive mortar, that is to say at least 1 MPa.
• compositions of Examples 3, 4 and 5 according to the invention also have an adhesion after heating of at least 1 MPa, satisfactory for a class C2 adhesive mortar.
• Example 4 The composition of Example 4 is particularly advantageous, making it possible to obtain excellent adhesion properties while offering particularly easy disassembly, requiring little time and heating.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Ceramic Engineering (AREA)
• Materials Engineering (AREA)
• Structural Engineering (AREA)
• Organic Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Inorganic Chemistry (AREA)
• Civil Engineering (AREA)
• Adhesives Or Adhesive Processes (AREA)
• Curing Cements, Concrete, And Artificial Stone (AREA)

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• 2022
  • 2022-06-01 FR FR2205276A patent/FR3136233B1/fr active Active
• 2023
  • 2023-06-01 WO PCT/EP2023/064664 patent/WO2023232934A1/fr not_active Ceased
  • 2023-06-01 EP EP23730107.2A patent/EP4532438A1/de active Pending

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