FR2483939A1 - Patching compsn. for cracks and joints - comprising synthetic copolymer, plasticiser, e.g. di:octyl-phthalate, and elastic fibres, e.g. polyamide - Google Patents

Abstract

Patching compsn.for cracks and the like in buildings comprises a synthetic copolymer, a plasticiser having very low vapour pressure and elastic fibres pref. 1-10 mm. long.S Used for repairing cracks in walls or filling in joints between different materials e.g. wood and plaster, metal and cement. The compsn., once applied, remains sufficiently flexible while having a high tensile strength and tear resistance and accommodating crack deformation due to differential expansion of the materials. Pref. the compsns. contain a mineral filler (CaCO3), a film-forming material (e.g. an aromatic hydrocarbon or butylglycol), an antiseptic agent, a sequestering agent (Na hexametaphosphate), a thickener (hydroxymethyl-cellulose), a lubricating lamellar filler (asbestos powder), and an antifoaming agent. The elastic fibres are pref. polyamide fibres and the plasticiser is pref. dioctylphthalate.

Description

The present invention relates to a product for plugging cracks and fissures for application in the building sector.

During the aging of a building, cracks and cracks sometimes appear quickly, either in a homogeneous material such as a wall or ceiling plate, or in the junction zone between two difffirent materials, such as wood. and plaster, and metal and cement for example, taking into account the coefficients of expansion of the materials which are different.

 Prior to finishing a room or repairing all or part of a building, it is necessary to plug the cracks and crevices, and in particular to grout the periphery of the frames, doors and slots.

There are hard products after drying, such as plaster or painter's coating which, if they are relatively simple to use, have the disadvantage of being brittle and discover, after a short time, a new crack , from the fact that the initial crack or crack continues to "work", and that their hardness does not allow them to compensate for this new deformation.

Flexible products such as elastomeric seals, for their part, are too flexible, so that they deform under the effect of the movements of the crack, they also allow the reappearance of the latter on finishing paints.

The most effective solution currently used for plugging cracks and crevices is to use a calico strip, which has the advantage, while having good mechanical strength, of being flexible enough to deform in order to compensate for the subsequent movements of the crack or crack.

 This technique has, however, the disadvantage of being a delicate implementation and is therefore practically reserved for professionals.

 The present invention aims to remedy these drawbacks.

To this end, the product which it relates comprises a synthetic copolymer, a plasticizer with very low vapor pressure and elastic fibers.

This makes it possible to obtain a product which, once applied, remains sufficiently flexible, while possessing a high resistance to traction and tearing, which gives it its three-dimensional reinforcement of fibers. This reinforcement allows the product to follow the deformations of the crack due to differential expansion of the materials or settlement, and to cancel the effects of these deformations on the surface, in particular by avoiding cracking of the finish paints.

This product in the form of a paste can advantageously be packaged in a flexible tube fitted with an extrusion nozzle forming an applicator.

 It is therefore sufficient for the user to extrude a bead of material in the crack to be plugged, or several parallel cords if it is a wider slot, then to smooth with the finger or with a spatula and to sand after a signage for a few hours.

 It is an extremely simple technique of implementation even for an unskilled person wishing for example to renovate his home by himself.

 Advantageously, the fibers forming the reinforcement have a length of between 1 and 10 mm.

 According to another characteristic of the invention, the product contains a mineral diluent and a lubricating lamellar filler.

The mineral thinner limits the elasticity of the product, while the lamellar filler facilitates the finishing operations and in particular the sanding after drying.

 In order to facilitate, when drying, the re-agglomeration of the dispersed particles, the product contains a film-forming agent.

In addition, this product includes an antiseptic agent ensuring protection against mold, a sequestering agent which blocks calcium ions which can precipitate the dispersed part, an interface stiffness agent which facilitates application and strengthens the storage behavior, a buffer solution, an anti-foaming agent due to the presence of surfactants and titanium dioxide to obtain a white coloring.

 According to one possibility, the fibrous load is constituted by polyamide fibers, the plasticizer is dioctylphthalate, the mineral diluent is lime carbonate, the lamellar lubricating load is asbestos powder, the film-forming agent is a coalescing agent such as a heavy aromatic carbide or butyl glycol, the sequestering agent is sodium hexamotaphosphate, and the interface stiffening agent is hydroxyethyl cellulose.

 As is apparent from what proceeds, the invention brings a great improvement to the existing technique by providing a product for plugging cracks and slots having three-dimensional stability giving it great resistance, while having sufficient flexibility to compensate for deformations subsequent of the closed crack.

In addition, this product in the form of a paw whose conservation in the absence of air is of practically unlimited duration is of a very simple implementation, and allows a finishing by passage of any decorative product such as paint. of any quality.

 It goes without saying that the invention is not limited to the sole composition of this product, described above by way of example; on the contrary, it embraces all of its variant embodiments.

Claims (9)

 - CLAIMS 1. - Product for plugging cracks and fissures for application in the building sector, characterized by the fact that it includes a synthetic copolymer, a plasticizer with very low vapor pressure and elastic fibers.  2. - Product according to claim i, characterized in that the fibers forming the reinforcement have a length of between 1 and 10 mm,  3. - Product according to any one of claims 1 and 2, characterized in that it contains a mineral diluent and a lubricating lamellar filler. 4. - Product according to any one of claims 1 to 3, characterized in that it contains a film-forming agent.  5. - Product according to any one of claims 1 to Q, characterized in that it contains an antiseptic agent. 6. - Product according to any one of claims 1 to 5, characterized in that it contains a sequestering agent. 7. - Product according to any one of claims 1 to 6, characterized in that it contains an interface stiffness agent.  8. - Product according to any one of claims i to 7, characterized in that it contains an anti-foaming agent.  9. - Product according to all of claims 1 to 8, characterized in that the fibrous load is constituted by polyamide fibers, the plasticizer is dioctylphthalate, the mineral diluent and carbonate of lime, the lamellar load of lubrication is powder asbestos, the film-forming agent is a coalescing agent such as a heavy aromatic carbide or butylglycol, the sequestering agent is sodium hexametaphosphate, and the interface stiffness agent is hydroxymethylcellulose .