FR2654130A1 - PRODUCT FOR THE PREPARATION OF A COATING, AND EXTERIOR INSULATION COATING MADE WITH SUCH A COATING. - Google Patents

Abstract

The subject of the invention is a product for preparing a coating which can be used especially for the production of an insulating coating comprising an insulating wall (2) fixed to the support (1) on which a reinforced base layer is applied. consisting of a coating (3) in which a frame (4) is coated, the assembly being covered with a finishing coating (5). According to the invention, the base coating (3) and the finishing coating (5) have the same constitution and are both made from two components kept separately, respectively a first component consisting of a cement mortar comprising about 40 to 50% of a fine sand and about 30 to 40% of a medium sand and a second component consisting of a dilute resin with the addition of an antifoaming agent and a preservative, the two components being mixed at the time of application.

Description

The subject of the invention is a product for the preparation

  cement coating intended to cover the outer face

  of a support such as a building wall and usable,

  in particular for the realization of an insulation coating

  tion from the outside. For some time now, the thermal insulation of buildings from the outside has developed, and the technique which consists of covering the outside face of the wall to be insulated with a set is very commonly used.

  comprising, from the inside to the outside, an iso-

  lante on which an armed base coat is applied

  itself covered with a finishing coating.

  The insulating wall usually consists of expanded polystyrene (PS E) or glass wool or rock wool panels and can be fixed to the support either by gluing, or by various devices of the staple or pulling type made of plastic or metal. base layer consists of a coating in

  which is coated with a lattice-like frame, generally

  Really made of fiberglass Because of this, the coating is applied

  qué in at least two passes, respectively a first pass for producing a relatively thin bonding layer spread on the external face of the insulating wall and on

  which the trellis is laid, the latter then being covered

  green with a second thicker layer constituting the body of the coating The assembly is covered with a finishing coating itself consisting of at least one primer for the protection of the base layer and which is covered, the

  more often, by a layer of decoration.

  So far, it seemed normal to make the different plaster layers using different products

  specially adapted to their function.

  When the insulation is stuck on the wall, we use, first of all, an adhesive generally

  of a paste composed of mineral fillers and as adjuvants

  combined with a resin and which is mixed with a certain proportion of cement The base layer, also called undercoat, is intended for the coating and the bonding of the reinforcement on the insulation As this layer is applied on the insulating

  and exposed to the sun and cold, it must have a certain

  soft flexibility to resist differential expansion-

  them and that is why we generally incorporate a certain amount of resin into the coating. Sometimes we use the same product as for the glue, varying the dosage of cement.

  In both cases, the dough contains a mineral filler

fine grain size.

  Often we prefer to cover the base layer

  a primer before applying the fi-

  nition The latter is generally in the form of a thick, grainy paste consisting of a mixture of mineral fillers and, optionally, colored pigments

in an organic binder.

  Differential expansion is absorbed thanks to the flexibility of the reinforced base layer

  The three coatings are of different compositions

  which can lead to different tensions and a

  risk of cracking and delamination.

  On the other hand, the bonding adhesive and the different plasters must be prepared separately when they are

  application and before applying a coat it is necessary

  Please wait for the drying of the previous layer, which requires a fairly long time, varying depending on weather conditions, and which can be up to 48 hours. When building large buildings, drying

  a layer can take place on a part of the building during

  When installing on another part On the other hand, for smaller supports, for example for a detached house, the need to wait for the

  drying one coat to apply the next can

loss of significant time

  On the other hand, if the different products are mixed

  aged at the time of application, it is rare to prepare

  exactly the quantity corresponding to that which one needs-

  care and, after the preparation of the plaster, there remains

  that produces a certain amount that cannot be kept.

  This results in significant losses.

  The subject of the invention is a new product and a new embodiment of an insulating coating which

  with no such disadvantages.

  In accordance with the invention, the coating constituting the

  base coat and top coat have the same consistency

  titration and are both made from two components, respectively a first component consisting of a cement mortar comprising from 40 to 50% approximately of a

  fine sand and about 30 to 40% of a medium sand and a

  cond component consisting of a diluted resin added with an anti-foaming agent and a preservative These two components are

  kept separately, the resin not being mixed with the mor-

  tier, in desired proportion, only at the time of use

for the preparation of the plaster.

  The active proportion, by weight, of the second component is 30 to 35% of the amount of cement contained in the first component In the case where the insulating wall is fixed to the outside face of the support by means of an adhesive, according to invention, the adhesive for fixing the insulating wall is produced in the same way as the base plaster and the plaster

  finishing from the same two components which are mixed

diapers at the time of bonding.

  The choice and dosage of the different constituents, and

  especially sand, therefore allows the same pro-

  works both as an adhesive and as a finish.

  However, the invention also covers the product developed for the preparation of the single coating and consisting of two components kept separately, respectively: a first component having the following composition by weight: 30% white or gray cement; 40 to 50% of a fine sand with a particle size of up to about 0.5 mm, to 40% of a medium sand with a particle size of between about 0.5 and 1.5 mm, and also containing a rheology, a water repellency agent and a thixotropy agent,

  and a second component consisting of a copolymer vi-

  nylon in aqueous dispersion added with an anti-foaming agent

  health and a preservative, the two components being mixed and mixed for

  realization of the coating at the time of use.

  Such a coating could advantageously be used

  as a wall covering, even in the absence of insulation.

  However, the invention will be better understood by the description

  tion of a particular embodiment.

  In the single figure, there is shown such a coating

  in cross section and on an enlarged scale.

  Conventionally, the insulating coating, which is applied to the outer face 10 of a support 1 such as a building wall, comprises an insulating wall 2 made, for example, of polystyrene panels placed side by side,

  a base layer 3 in which is incorporated an ar-

  mature 4 and a finishing coating 5 produced in au

minus one layer.

  The panels constituting the insulating wall 2 are

  fixed on the support 1 either by means of staples or

  cities, either by collage In this case, as we have shown

  felt in the drawing, there are on the outer face 10 of the wall 1, strips of adhesive paste 6 spaced from each other and on which the insulating panels 2 are applied.

crushing the dough 6.

  The panels 2 are then covered with a first layer of plaster 31 on which the mesh 4 is applied, then the latter is covered with a second layer 32 of E so as to be entirely coated, the second layer 32 is then covered with the same product, sprayed with ur

  compressed air device, for example.

  The trellis 4 is constituted, as usual,

  fiberglass or kevlar with 3 to 5 mm square mesh.

  As indicated above, the same coating made from E is used to make the paste E and the base layer 3

  two components mixed at the time of application, respectively

  cement mortar and resin.

  The first component is a mortar having, preferably

  the following composition: at 30% and preferably 16 to 25% of white or gray cement, 40 to 50% of a fine sand with a particle size of up to about 0.5 mm and, preferably, between 80 and 400 microns, at 45% and, preferably, 25 to 35% of an average sand E with particle size ranging from 0.5 to 1.5 mm, up to 0.3% and, preferably, between 0.08 and 0.25 to

  a rheology agent such as a cellulose derivative

  that, up to 0.2% and preferably between 0.05 and 0.15 of a water repellant and a thixotropy agent, for example short fibers, in a proportion such that the weight ratio of this thixotropy agent on the active fraction of the second component is at most equal to 1 00

in weight.

  The second component is a dilute resin, preferably

  contains a vinyl copolymer, combined with an anti-

foaming and a preservative.

  The two components are kept separately and

  only changed when applied in proportions

  20 to 35% resin based on the amount of cement in the mortar, a proportion of 32% being

particularly advantageous.

  The amount of water contained in the second component is normally sufficient to adequately hydrate the

hydraulic binder.

  Given the grain size and the dosage of the medium sand contained in the mortar, the presence of grains of up to 1.5 mm secures the coating of the mesh and

  the presence of a significant proportion of fine elements associated

  ciés a resin and additives ensures the adhesion of the coating 3 on the insulating panels

and on the trellis 4.

  Furthermore, the presence of a significant proportion

  medium sand gives the coating resistance to compression

  enough to quickly apply another coat.

  It is thus possible to give the base layer 3, a thickness sufficient to ensure the durability of the waterproofing,

  this thickness must be at least 3 mm.

  On the other hand, thanks to the mixture, in the mortar, of fine sand and medium sand and the addition of a resin, the same coating can be used to make the finishing coating 5, the proportions in fine elements and in resin ensuring the coating the necessary flexibility while the proportion of medium sand gives it a state

  surface of traditional appearance The thermoplastic character-

  coating tick is less marked than that of the coatings

  plastic parts usually used and is less

  likely to fix ambient dust.

  However, it has also been found that despite the presence of a fairly large proportion of medium sand, the coating according to the invention could however be used as a product.

  adhesive for bonding the insulation to the support.

  Thus, thanks to the use of the product which has just been defined, the same components can be used

  to produce a unique coating constituting the adhered product

  sif 6, base coat 3 and top coat 5.

  We therefore see that, thanks to the invention, layers 3 and 5 constitute, in fact, the same product. It is no longer

  it is necessary to wait for the complete drying of the base layer

  before applying the finishing coating and, on the contrary, it is even advantageous not to wait too long to apply the finishing layer 5 so as to improve its adhesion In practice, as for the production of conventional coatings on a certain thickness, we will wait

  simply, for a new pass, that the previous layer

  be hardened enough to support the application of

  the following The presence of medium sand in the favored coating

  resistance to compression.

  We therefore see that the two layers 3 and 5 will be sim-

  continuously carried out in several passes,

  in the same way as a conventional plaster.

  Compared to the systems used up to now and which required the complete drying of a layer of plaster before laying the next layer, it is thus possible to obtain a

  50% saving in plaster installation time for a house

  dividual In large buildings where a layer can be made on part of the building while another part is being dried, the time saving is less but can however be estimated at around 20% insofar as o staff hardly need to travel. But another very important advantage of the invention

  lies in the fact that we have on site unique-

  ment of two components which are kept separately to be mixed only at the time of mixing In this way, we can better appreciate the quantity of product that must be prepared and, at the end of the operation, there is only '' only one remains, the quantity of product lost being thus much

less important.

  On the other hand, if the invention has been developed specifically

  cially for the production of insulation coatings from the outside, it is not limited to this single application Indeed, thanks to its qualities of resistance, external appearance, adhesion to the support and relative

  flexibility, the coating prepared from the two components

  finished above can advantageously be used as

  simple finishing coating applied directly to the fac-

this exterior of a wall.

Claims (5)

CLAIMS 1. Thermal insulation coating intended to cover the external face of a support (1) and comprising, in cross section from inside to outside, a wall (2) of insulating material, fixed on the external face of the support (l), a reinforced base layer (3) consisting of a coating applied in at least two passes on the external face of the insulating wall (1) and in which is coated a reinforcement (4) in the form of a trellis, and a finishing coating (5) applied to the base layer (3). characterized by the fact that the base plaster (3) and the finishing coating (5) have the same constitution and are both produced from two components stored separately, respectively a first component consisting of a cement mortar comprising from 40 to 50% approximately of fine sand and from 30 to 40% approximately of medium sand and a second component consisting of a diluted resin added with an anti-foaming agent and a preservative, the two components being mixed at the time of application.   2.Insulating coating according to claim 1, in   which the insulating wall (2) is fixed on the external face   re of the support (1) by means of an adhesive, characterized in that the fixing adhesive (6) of the insulating wall (2) is produced in the same way as the base coating and the finishing coating , from the same two components which   are mixed at the time of bonding.   3. Insulating coating according to one of claims   1 and 2, characterized in that the active proportion of the second component is 30 to 35% of the amount of cement contained in the first component.   4 Insulating coating according to one of claims   1, 2 and 3, characterized in that the first component is a mortar containing by weight: 30% white or gray cement; at 50% of a fine sand with a particle size ranging up to approximately 0.5 mm to 40% of a medium sand with a particle size between approximately 0.5 and 1.5 mm, said mortar additionally containing a rheology agent , and a water repellant and a thixotropy agent.   5. Insulating coating according to one of claims   previous, characterized in that the second component   is a vinyl copolymer added with an anti -   foaming agent and a preservative.   6 Insulating coating according to claim   3, characterized in that the first component has the com-   next position by weight: 16 to 25% white or gray cement at 49% of a fine sand with a particle size ranging from 0 to 400 microns and preferably from 80 to 400 microns at 35% of a medium sand with a particle size ranging from 0.5 to 1.5 mm 0.08 to 0.25% of a rheology agent, preferably a cellulose derivative, 0.05 to 0.15% of a water repellency agent, and a thixotropy agent.   7.Product for the preparation of a cement plaster,   characterized by the fact that it comprises two components con -   served separately, respectively a first component   consisting of a cement mortar comprising from 40 to 50% approximately of fine sand and from 30 to 40% approximately of medium sand and a second component consisting of a dilute resin added with an anti-foaming agent and a preservative, the two components being mixed in desired proportions only at the time of   use for the preparation of plaster.   8 Product for the preparation of a coating according to claim 7, characterized in that the active proportion of the second component is 30 to 35% of the amount of   cement contained in the first component.   9.Product for the preparation of a plaster according to   one of claims 7 and 8, characterized in that   the first component is a mortar containing by weight: 30% white or gray cement; 40 to 50% of a fine sand with a particle size of up to about 0.5 mm, to 40% of a medium sand with a particle size between about 0.5 and 1.5 mm, said mortar further containing an agent of rheology, a   water repellant and thixotropy agent.   l O. Product for the preparation of a plaster according to   one of claims 7 to 9, characterized in that   the second component is a vinyl copolymer added   an anti-foaming agent and a preservative.   1 l Product for the preparation of a plaster according to   one of claims 7 to 10, characterized in that   the first component has the following composition by weight: 16 to 25% of white or gray cement at 49% of a fine sand with a particle size ranging from 0 to 400 microns and preferably from 80 to 400 microns at 35% of a sand grading means ranging from 0.5 to 1.5 mm 0.08 to 0.25% of a rheology agent, preferably a cellulose derivative,   0.05 to 0.15% of a water repellant.   12.Product for the preparation of a plaster according to   one of claims 7 to 11, characterized in that   the first component contains a thixotropy agent, such as short fibers, in a proportion such that   weight ratio of this agent on the active fraction of the se-   component component is at most equal to 10% by weight.