EP2379465A2

EP2379465A2 - Painter's canvas including an agent capable of trapping formaldehyde and manufacturing process

Info

Publication number: EP2379465A2
Application number: EP09805758A
Authority: EP
Inventors: Benjamin Blanchard; Katarzyna Chuda; Boris Jaffrennou
Original assignee: Saint Gobain Adfors SAS
Current assignee: Saint Gobain Adfors SAS
Priority date: 2008-12-19
Filing date: 2009-12-18
Publication date: 2011-10-26
Anticipated expiration: 2029-12-18
Also published as: FR2940273B1; BRPI0923143B1; AU2009329357B2; EP2379465B1; CA2747694C; JP5749654B2; US20110300359A1; CN102325734A; BRPI0923143B8; FR2940273A1; WO2010070248A3; AU2009329357A1; CN106367965A; CA2747694A1; RU2517509C2; DK2379465T3; MX2011006531A; WO2010070248A2; JP2015110897A; JP2012512977A

Abstract

The present invention relates to a painter's canvas based on glass fibers intended to be applied to an interior surface of a building, which includes an agent capable of trapping formaldehyde chosen from compounds comprising active methylene(s), hydrazides, tannins, amides, amino acids, peptides and proteins. Another subject of the present invention is the process for producing said painter's canvas.

Description

PAINTABLE PAINTING COMPRISING A FORMALDEHYDE-RELATED AGENT AND PROCESS FOR PRODUCING THE SAME

The invention relates to a fiberglass-based paintable fabric to be applied to an interior surface of a building, which contains an agent capable of trapping formaldehyde.

The invention also relates to the process for obtaining said painting fabric. A wide variety of materials are used for the construction and interior design of residential and office buildings. Some of these materials such as acoustic and / or thermal insulation, wood panels, furniture and decorative elements use adhesives, paints and varnishes using formaldehyde. The proportion of free formaldehyde in these materials is already very low. Nevertheless, the regulation of the protection against undesirable emissions of products that may pose a risk to the health of individuals becomes stricter and makes it necessary to further reduce the amount of free formaldehyde that may be emitted by the materials over time.

Means for reducing the amount of formaldehyde inside buildings are known.

It has been proposed to include photocatalytic titanium oxide particles in a paint or plaster material (US-A-2005/0226761), paper or textile, plastic or wood material (EP-A-1). 437,397).

It is also known to use a hydrazide in a plaster or cement-based building material (US-A-2004/0101695 and JP-A-2004115340). It has also been proposed to add charred oyster shell powder in a paint or paper, especially wallpaper (JP-A-2005230729. The present invention aims to reduce the amount of formaldehyde present inside buildings.

To achieve this object, the present invention provides a fiberglass paint fabric which contains an agent capable of trapping formaldehyde.

Another object of the invention relates to the method of manufacturing the canvas to be painted.

By "compound capable of reacting with formaldehyde" is meant an organic compound which binds to formaldehyde by covalent bonding.

Preferably, the compound capable of reacting with formaldehyde is chosen from:

The active methylene compounds, preferably having the following formulas:

> FORMULA (I)

in which :

R 1 and R ₂ , which are identical or different, represent a hydrogen atom, a C 1 -C 20 alkyl radical, preferably C 1 -C 6 radical, an amino radical or a radical of formula in which R ₄ represents a radical

- CH ₂ - C - CH 3 O or

C = CH ₂

^Rδ where R ₅ = H or -CH ₃ and p is an integer ranging from 1 to 6 R3 represents a hydrogen atom, a C10 -alkyl radical, a phenyl radical or a halogen atom;

- a is equal to 0 or 1

- b is 0 or 1 - n is 1 or 2

The preferred compounds of formula (I) are:

2,4-pentanedione:

Ri = -CH ₃ ; R ₂ = -CH ₃ ; R ₃ = H; a = 0; b = 0; n = 1

2,4-hexanedione: R 1 = -CH ₂ -CH ₃ ; R ₂ = -CH ₃ ; R ₃ = H; a = 0; b = 0; n = 1

- 3,5-heptanedione

R 1 = -CH ₂ -CH ₃ ; R ₂ = -CH ₂ -CH ₃ ; R ₃ = H; a = 0; b = 0; n = 1

- 2,4-octanedione:

Ri = -CH ₃ ; R ₂ = - (CH ₂ ) ₃ -CH ₃ ; R ₃ = H; a = 0; b = 0; n = 1 - acetoacetamide:

Ri = -CH ₃ ; R ₂ = -NH ₂ ; R ₃ = H; a = 0; b = 0; n = 1

- acetoacetic acid:

Ri = -CH ₃ ; R ₂ = H; R ₃ = H; a = 0; b = 1; n = 1

methylacetoacetate: R 1 = -CH ₃ ; R ₂ = -CH ₃ ; R ₃ = H; a = 0; b = 1; n = 1

- ethylacetoacetate:

Ri = -CH ₃ ; R ₂ = -CH ₂ -CH ₃ ; R ₃ = H; a = 0; b = 1; n = 1

n-propylacetoacetate:

Ri = -CH ₃ ; R ₂ = - (CH ₂ J ₂ -CH ₃ ; R ₃ = H; a = 0; b = 1; n = 1 - iso-propylacetoacetate:

Ri = -CH ₃ ; R ₂ = -CH (CH ₂ ) ₂ ; R ₃ = H; a = 0; b = 1; n = 1

iso-butylacetoacetate

Ri = -CH ₃ ; R ₂ = -CH ₂ -CH (CH ₂ ) ₂ ; R ₃ = H; a = 0; b = 1; n = 1

t-butylacetoacetate: R 1 = -CH ₃ ; R ₂ = -C (CH ₃ ) ₃ ; R ₃ = H; a = 0; b = 1; n = 1

n-hexylacetoacetate:

Ri = -CH ₃ ; R ₂ = - (CH ₂ ) S-CH ₃ ; R ₃ = H; a = 0; b = 1; n = 1

- malonamide: Ri = -NH ₂ ; R ₂ = -NH ₂ ; R ₃ = H; a = 0; b = 0; n = 1

- malonic acid:

R ₁ = H; R ₂ = H; R ₃ = H; a = 1; b = 1; n = 1

dimethylnalonate: R 1 = -CH ₃ ; R ₂ = -CH ₃ ; R ₃ = H; a = 1; b = 1; n = 1

diethylmalonate:

R 1 = -CH ₂ -CH ₃ ; R ₂ = -CH ₂ -CH ₃ ; R ₃ = H; a = 1; b = 1; n = 1

di-n-propylnalonate:

R 1 = - (CH ₂ ) ₂ -CH ₃ ; R ₂ = - (CH ₂ ) ₂ -CH ₃ ; R ₃ = H; a = 1; b = 1; n = 1 - di-iso-propylmalonate:

Ri = -CH (CHs) ₂ ; R ₂ = -CH (CH ₃ ) ₂ ; R ₃ = H; a = 1; b = 1; n = 1

di-n-butylnalonate:

R 1 = - (CH ₂ ) ₃ -CH ₃ ; R ₂ = - (CH ₂ ) ₃ -CH ₃ ; R ₃ = H; a = 1; b = 1; n = 1 - acetonedicarboxylic acid: R 1 = H; R ₂ = H; R ₃ = H; a = 1; b = 1; n = 2

dimethylacetonedicarboxylate:

Ri = -CH ₃ ; R ₂ = -CH ₃ ; R ₃ = H; a = 1; b = 1; n = 2

1,4-butanedioldiacetate

Ri = -CH ₃ ; R ₂ = - (CH ₂ J ₄ -O-CO-CH ₂ -CO-CH ₃ ; R ₃ = H; a = 0; b = 1; n = 1;

- 1,6-hexanedioldiacetate

Ri = -CH ₃ ; R ₂ = - (CH ₂ J ₆ -O-CO-CH ₂ -CO-CH ₃ ; R ₃ = H; a = 0; b = 1; n =

methacryloxyethylacetoacetate

Ri = -CH ₃ ; R ₂ = - (CH ₂ ) ₂ -O-CO-C (CH ₃ ) = CH ₂ ; R ₃ = H; a = 0; b = 1; n = 1.

> FORMULA (II)

R ₆ - CHR ₇ -C≡N in which

Rβ represents a cyano radical or a C- (O) _O -R ₈ ° radical in which: R ₈ represents a hydrogen atom, a C 1 -C 20 alkyl radical, preferably a C ₁ -C ₆ radical, or an amino-c radical is equal to 0 or 1;

- R ₇ represents a hydrogen atom, a C 1 -C 10 alkyl radical, a phenyl radical or a halogen atom. The preferred compounds of formula (II) are:

2-methylcyanoacetate: R ₆ = -CO-O-CH ₃ ; R ₇ = H

2-ethylcyanoacetate:

R ₆ = -CO-O-CH ₂ -CH ₃ ; R ₇ = H

2-n-propylcyanoacetate:

R ₆ = -CO-O- (CH ₂ ) ₂ -CH ₃ ; R ₇ = H

2-iso-propylcyanoacetate: R ₆ = -CO-O-CH (CH ₂ ) ₂ ; R ₇ = H

2-n-butylcyanoacetate:

R ₆ = -CO-O- (CH ₂ ) ₃ CH ₃ ; R ₇ = H

2-iso-butylcyanoacetate:

R ₆ = -CO-O-CH ₂ -CH (CH ₂ ) ₂ ; R ₇ = H

2-tert-butylcyanoacetate: R ₆ = -CO-OC (CH ₃ ) ₃ ; R ₇ = H

2-cyanoacetamide: R ₆ = -CO-NH ₂ ; R ₅ = H

propanedinitrile: R ₆ = -CΞN; R ₅ = H

> FORMULA (III)

CH ₂ - O CO CH ₂ R ₉

R ₉ CH ₂ CO O CH ₂ - C (CH ₂ ) _q CH ₃

CH ₂ - O CO CH ₂ R ₉

(III) in which

C≡N CO CH ₃

- Rg represents a radical ~ "or

q is an integer ranging from 1 to 4. The preferred compounds of formula (III) are: trimethylolpropane triacetoacetate: R ₉ = -CO-CH ₃ ; q = 1

trimethylolpropane tricyanoacetate: R ₉ = -CΞN; q = 1

> FORMULA (IV)

in which

A represents a radical ^{(CH 2) 3} or ^c ( ^CH ² ) ²

r is equal to 0 or 1 The preferred compounds of formula (IV) are:

1,3-cyclohexanedione:

- Meldrum acid: A = -C (CHs) ₂ -; r = 1 2 - hydrazides, for example: a) the monohydrazides of formula RiCONHNH ₂ in which R 1 represents an alkyl radical, for example methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl or ter -butyl, or an aryl radical, for example phenyl, biphenyl or naphthyl, it being understood that a hydrogen atom of said alkyl or aryl radicals may be replaced by a hydroxyl group or a halogen atom, and said aryl radical may be substituted by an alkyl radical, for example methyl, ethyl or n-propyl, b) dihydrazides of formula H ₂ NHN-X-NHNH ₂ in which X represents a radical -CO- or -CO-Y-CO, and Y is an alkylene radical, for example methylene, ethylene or trimethylene, or an arylene radical, for example phenylene, biphenylene or naphthylene, it being understood that a hydrogen atom of the said alkylene or arylene radicals may be replaced by a hydroxy group or a diene atom; halogen, and said aryl radical can be substituted with an alkyl radical, for example methyl, ethyl or n-propyl. By way of examples, mention may be made of oxalic acid dihydrazide, malonic acid dihydrazide, succinic acid dihydrazide, adipic acid dihydrazide, sebacic acid dihydrazide and maleic acid dihydrazide. , fumaric acid dihydrazide, diglycolic acid dihydrazide, tartaric acid dihydrazide, malic acid dihydrazide, isophthalic acid dihydrazide, terephthalic acid dihydrazide and carbohydrazide, c) polyhydrazides such as trihydrazides, in particular citric acid trihydrazide, pyromellitic acid trihydrazide, 1,2,4-benzenetrihydrazide, nithloacetic acid trihydrazide and cyclohexanetricarboxylic acid trihydrazide, tetrahydrazides, especially tetrahydrazide, ethylenediaminetetraacetic acid, 1, 4,5,8-naphthoic acid tetrahydrazide, and polyhydrazides formed from a hydrazide monomer containing a polymerizable group, for example a poly (hy acrylic acid drazide) or a poly (methacrylic acid hydrazide).

3 - tannins, especially condensed, such as tannins of mimosa, quebracho, pine, pecan nuts, hemlock wood and sumac.

4-amides, for example urea, 1,3-dimethylurea, ethyleneurea and its derivatives such as N-hydroxyethyleneurea, N-aminoethylethyleneurea, N- (3-allyloxy-2-hydroxypropyl) aminoethylethyleneurea, N-acryloxyethylethyleneurea, N-methacryloxethylethyleneurea, N-acrylaminoethylethyleneurea, N-methacrylaminoethylethyleneurea, N-methacryloxyacetoxyethyleneurea, N-methacryloxyacetaminoethylethyleneurea and N-di (3-allyoxy). 2-hydroxypropyl) aminoethylethyleneurea, biurea, biuret, triuret, acrylamide, methacrylamide, polyacrylamides and polymethacrylamides,

Amino acids, for example glycine, peptides and proteins of animal or vegetable origin.

The amount of formaldehyde-entraining agent to be used may vary to a large extent, for example from 0.1 to 500 g / m ² of the fabric to be painted, preferably from 0.5 to 100 g / m ² and advantageously from 1 to 50 g / m ² . Where appropriate, the agent capable of trapping formaldehyde may also comprise at least one porous material which adsorbs formaldehyde.

This porous material is in the form of particles having a size which varies from 10 nm to 100 μm, preferably 500 nm to 50 μm, and advantageously 1 to 10 μm. Preferably, the particles have a specific surface area which varies from 1 to 5000 m ² / g, advantageously from 5 to 2000 m ² / g, and an average pore diameter ranging from 1 to 50 nm, preferably 1 to 20 nm.

The porous material may be silica, microporous or mesoporous, pyrogenic or not, a carbon black, a zeolite or a porous polymer. The painting fabric according to the invention is based on glass fibers and may optionally contain fibers consisting of a thermoplastic organic material such as polyethylene and polypropylene.

Preferably, the fabric to be painted is a fabric obtained from glass yarns composed of a multitude of glass filaments (or base yarn) or derived from these yarns, especially the assemblies of these roving base yarns.

("Roving" in English), or mixed yarns comprising at least one glass yarn composed of a multitude of glass filaments and at least one yarn composed of a multitude of filaments of the abovementioned thermoplastic organic material, or yarns "Comêlés" consisting of filaments of glass and filaments of the aforementioned organic material intimately mixed.

The aforementioned son may be son without torsion or twisted son. The glass used in the constitution of the son can be of any type, for example E, C, R, AR (alkali-resistant). E-glass is preferred.

The diameter of the glass filaments constituting the wires may vary to a large extent, for example 5 to 30 μm. In the same way, wide variations can occur in the linear density of the yarn which can range from 34 to 1500 tex.

Advantageously, the painting fabric comprises, in warp, a twisted glass yarn (textile yarn) and, as a weft, a non-twisted glass yarn having undergone a treatment designed to separate the glass filaments so as to give them volume ( or "voluminized" wire). The linear density of the warp and weft yarns preferably varies from 50 to 500 tex. Preferably, the canvas to be painted has a basis weight which varies from 30 to 1000 g / m ² .

Conventionally, the painting fabric is coated with a primer composition which holds the yarns, obscures the pores and gives it the rigidity that is appropriate for the laying on the final support can be carried out properly. Preferably, the coating is made on both sides of the canvas to be painted.

The primer composition is generally in the form of an aqueous solution containing, in percentage by weight: - 5 to 100% of a structuring compound consisting of a cold-soluble starchy compound, at a temperature of about 25.degree. ° C, such as a starch,

0 to 90% of a hydrophobic polymer, for example a homo- or copolymer of vinyl acetate, of (meth) acrylic acid, in particular a stryrene-(meth) acrylic acid copolymer, 15% of a white charge and occulting, for example titanium oxide,

0 to 40% of a flameproofing agent, for example zirconium salts,

0 to 30% of a foaming agent, for example an amine oxide,

0 to 20% of a foam stabilizing agent, for example ammonium stearate,

0 to 20% of a water-repellent agent, for example a paraffin or antimony trioxide,

0 to 10% of a biocidal and / or antifungal agent.

The painting fabric may comprise an additional layer of a water reactivatable glue on its reverse side (face which in the final disposition is glued to the support). Such a layer allows the operator, by simply applying water on the coated side, to reactivate the glued face and to lay the canvas directly on the support.

The method of manufacturing the painting fabric is another object of the present invention.

Figure 1 is a schematic view of a conventional installation for applying the primer composition on a canvas to be painted. The painting fabric (1) unwound from the spool (2) in the direction indicated by the arrow passes into a scarf (3) comprising a roller (3a) which is immersed in a reservoir (4) containing the finishing composition and a roll (3b). In passing on the roller 3a, the painting fabric (1) is coated with the primer composition and the amount deposited is adjusted by the distance between the rollers 3a and 3b.

According to a variant of the method, the scarf 3 is replaced by the device 30 of Figure 2 which comprises two rollers 31a and 31b each having a central pipe 32 for feeding the pressurized primer composition. The peripheral zone of the rollers 31a and 31b is provided with perforations 33 through which the primer composition which is deposited on the canvas to be painted passes. A device 34 placed under the rollers 31a and 31b makes it possible to recover the excess of the sizing composition.

This variant embodiment makes it possible to apply the primer composition to both sides of the painting fabric (1). It has the advantage of not "crush" the weave pattern of the painting canvas: said pattern thus retains its original relief that can be highlighted later by the application of paint.

The coated paint cloth then passes into a drying device (5) comprising three heating rollers (5a, 5b, 5c) in contact with which the water is removed. The number of rollers present in the drying device varies from 1 to 20, and preferably does not exceed 14.

Advantageously, the temperature in the dryer decreases, that is, the first roll is heated to a higher temperature than the last roll. The maximum temperature to be applied at the level of the first roller depends on the nature of the threads that make up the canvas to be painted. By way of example, the temperature of the first roll is equal to 240 ^° C. and that of the last roll is equal to 110 ^° C. when the threads are made of glass. The maximum temperature of the first roll is lower in the case of co-mixed yarns containing filaments of thermoplastic organic material. The maximum temperature must not, however, exceed the melting temperature of the thermoplastic organic material having the lowest melting point. Other drying devices may be used, for example devices delivering hot air or operating by infrared radiation.

If desired, one or more other unheated rollers may be placed after the drying device 5 (not shown). These rollers serve in particular to guide the fabric and / or to adapt the speed of the line to allow the replacement of the coil 2.

The primed painting fabric (6) is then collected in the form of a winding (7).

According to the invention, there is added to this conventional installation a treatment step with an agent capable of trapping formaldehyde.

According to a first embodiment, the agent capable of trapping formaldehyde in the primer composition is introduced. This embodiment is preferred because it does not require any additional device for the application of the agent capable of trapping formaldehyde, which is advantageous from an economic point of view.

According to a second embodiment, the agent capable of trapping formaldehyde after the scarf (3) or the device (30) is applied and before the fabric to be painted passes over the drying device (5). The application of said agent can be carried out by any known means, preferably using the spray-operating device (8) described in FIG.

For example, this device may consist of a plurality of spray nozzles fed with an aqueous solution of the agent capable of trapping formaldehyde which generate divergent jets which interpenetrate shortly before coming into contact with the upper face (or face place) of the painting canvas. If necessary, the agent capable of trapping formaldehyde can be applied further on the lower face (or face back), for example by means of a conventional coating roll. The application of the agent capable of trapping formaldehyde can still be done in recovery, on the primed paint cloth, preferably on the face side. This way of proceeding is however more expensive because it imposes an additional step and specific means for the application agent capable of trapping formaldehyde in the form of an aqueous solution and for the removal of water.

The following examples illustrate the invention without limiting it. EXAMPLES 1 AND 2

A primer composition containing the following constituents is prepared in percent by weight:

Soluble starch at 25 ° C 5.5

Acrylic Binder (ACRONAL ^® S559; BASF) 9.2 Titanium Oxide 0.2

Paraffin 0,3

Zirconium salts 0.4

Agent capable of trapping formaldehyde 5.4

Water 79.0 The primer composition is obtained by introducing the water and the various constituents into a container, with stirring, the agent capable of trapping formaldehyde being added last. The agent capable of trapping formaldehyde is acetoacetamide (Example 1) and adipic acid dihydrazide (Example 2).

The primer composition is used to coat a painting fabric in the form of a glass fabric with a mass per unit area of 120 g / m ^2, comprising a textured glass yarn having a linear density of the order of 330 tex with a reduction of 1, 9 wire per cm and in chain a glass wire having a linear density of the order of 140 tex and a reduction of 3 son per cm. The application of the primer composition is carried out in the installation of FIG.

The scarf (3) is set to deposit on the order of 310 g of primer composition per m ² of canvas to be painted.

The paint canvas collected contains 65 g of primer (dry matter) per m ² of canvas to be painted, the amount of agent capable of trapping formaldehyde being equal to 17 g.

This fabric is subjected to formaldehyde absorption and desorption tests under the following conditions. A sample of the painting fabric is placed in a device according to ISO 16000-9, modified in that, in the test chamber, the relative humidity is equal to 45%. a) initially, the chamber is fed with a continuous air flow containing of the order of 50 μg / m ³ of formaldehyde for 7 days. The amount of formaldehyde in the air entering and leaving the chamber is measured, and the percentage of formaldehyde absorption by the painting fabric is calculated. b) in a second step, the chamber is fed with air containing no formaldehyde for 1 day and the amount of formaldehyde present in the air at the outlet of the chamber is measured.

Formaldehyde is measured by liquid chromatography (HPLC) under the conditions of ISO 16000-3.

Table 1 shows the percentage of formaldehyde absorbed by the painting fabric and the amount of formaldehyde in the air leaving the chamber for a painting cloth coated with the primer composition containing the trapping agent. formaldehyde (Examples 1 and 2) in comparison with the fabric coated with the primer composition containing no formaldehyde entraining agent (Reference).

Table 1

The amount of formaldehyde absorbed is higher for Examples 1 and 2 than the Reference: the absorption of formaldehyde is 13 times (Example 1) and 7.8 times (Example 2) higher at 1 day and remains relatively constant for the duration of the test.

The formaldehyde emitted in Examples 1 and 2 is much lower than the Reference. It is specified that the value of 6 μg / m ³ corresponds to the quantity of formaldehyde emitted measured under conditions where the test chamber contains no sample of canvas to be painted. EXAMPLES 3 TO 6

Soluble starch at 25 ° C 3.9

Acrylic binder (ACRONAL ^® S559; BASF) 11, 8

0.1 titanium oxide

Paraffin 0,5 Salts of zirconium 1, 50

Agent capable of trapping formaldehyde 3.8

Water 78.4

The primer composition is obtained by introducing the water and the various constituents into a container, with stirring, the agent capable of trapping formaldehyde being added last.

The agent capable of trapping formaldehyde is acetoacetamide (example

3), adipic acid dihydrazide (Example 4), ethyleneurea (Example 5) and an acacia tannin (Example 6).

The primer composition is used to coat a painting fabric in the form of a glass fabric with a mass per unit area of 80 g / m ² comprising a textured glass yarn having a linear density of the order of 330 tex with a reduction of 1, 9 wire per cm and in chain a glass wire having a linear density of the order of 140 tex and a reduction of 3 son per cm. The application of the primer composition is carried out in the installation of FIG.

The scarf (3) is set so as to deposit about 470 g of primer composition per m ² of fabric to be painted.

The collected painting cloth contains 65 g of primer (dry matter) per m ² of canvas to be painted, the amount of agent capable of trapping formaldehyde being equal to 18 g.

This fabric is subjected to formaldehyde absorption and desorption tests under the following conditions. A sample of the painting fabric is placed in a device according to ISO 16000-9, modified in that, in the test chamber, the relative humidity is 50%. a) initially, the chamber is fed with a continuous air flow containing of the order of 50 μg / m ³ of formaldehyde for 3 days. The amount of formaldehyde in the air entering and leaving the chamber is measured, and the percentage of formaldehyde absorption by the painting fabric is calculated. b) in a second step, the chamber is fed with air containing no formaldehyde and the amount of formaldehyde present in the air at the outlet of the chamber after 2, 4 and 8 days is measured.

Formaldehyde is measured by liquid chromatography

(HPLC) under the conditions of ISO 16000-3 using a detector to reach a detection threshold of 3 μg / m ³ . Table 2 shows the percentage of formaldehyde absorbed by the painting fabric and the amount of formaldehyde in the air leaving the chamber for a painting cloth coated with the primer composition containing the trapping agent. formaldehyde compared to a test chamber containing no paintable canvas (Reference). The results of the adsorption and desorption tests are given in Table 2.

Table 2

Claims

1. A fiberglass paint fabric comprising a primer for forming a coating of an interior surface of a building, characterized in that it contains an agent capable of trapping formaldehyde.

2. Canvas according to claim 1, characterized in that the agent capable of trapping formaldehyde is chosen from active methylene compounds (s), hydrazides, tannins, amides, amino acids, peptides and proteins.

3. Canvas according to claim 2, characterized in that the active methylene compound (s) corresponds to one of the following formulas (I) to (IV):

> FORMULA (I)

in which :

R 1 and R ₂ , which may be identical or different, represent a hydrogen atom, a C ₁ -C ₂ alkyl radical, preferably a C ₁ -C ₆ radical, an amino radical or a radical of formula in which R ₄ represents a radica

-CH ₂ -C- 3H3

O or

C = CH ₂

R ₅ and p is an integer ranging from 1 to 6 R 3 represents a hydrogen atom, a C 10 alkyl radical, a phenyl radical or a halogen atom - a is equal to 0 or 1

- b is equal to 0 or 1

- n is 1 or 2> FORMULA (II)

Re - CHR ₇ - C: ≡N

(H) in which

- Rβ represents a cyano radical or a radical C- (O) _O -R ₈

Where

Rs represents a hydrogen atom, a C 1 -C 20 alkyl radical, preferably CrCβ, or an amino-c radical is equal to 0 or 1;

R ₇ represents a hydrogen atom, a C 1 -C 10 alkyl radical, a phenyl radical or a halogen atom;

> FORMULA (III)

CH ₂ - O CO CH ₂ R ₉

R ₉ CH ₂ CO O CH ₂ - C (CH ₂ ) _q CH ₃

CH ₂ - O CO CH ₂ R ₉

(NI) in which

C≡N _{Λ1 1} -CO-CH ₃

- Rg represents a radical or

- q is an integer ranging from 1 to 4> FORMULA (IV)

in which

- _Λ A repre-sen _* a ra te _A d-ica it (CH ₂₎ ₃ - or C (CHs) ₂

r is 0 or 1

4. Canvas according to claim 3, characterized in that the compound of formula (I) is 2,4-pentanedione, 2,4-hexanedione, 3,5-heptanedione, 2,4-octanedione, the acetoacetamide, acetoacetic acid, methylacetoacetate, ethylacetoacetate, n-propylacetoacetate, iso-propylacetoacetate, iso-butylacetoacetate, t-butylacetoacetate, n-hexylacetoacetate, malonamide, malonic acid, dimethylmalonate, diethylmalonate, di-n-propylmalonate, di-iso-propylmalonate, di-n-butyl-malonate, acetonedicarboxylic acid and dimethylacetonedicarboxylate.

5. Canvas according to claim 3, characterized in that the compound of formula (II) is 2-methylcyanoacetate, 2-ethylcyanoacetate, 2-n-propylcyanoacetate, 2-iso-propylcyanoacetate, 2-n-butylcyanoacetate , 2-iso-butylcyanoacetate, 2-tert-butylcyanoacetate, 2-cyanoacetamide and propanedinitrile.

6. Canvas according to claim 3, characterized in that the compound of formula (III) is trimethylolpropane triacetoacetate and trimethylolpropane tricyanoacetate.

7. Canvas according to claim 3, characterized in that the compound of formula (IV) is 1,3-cyclohexanedione and Meldrum acid.

8. Canvas according to claim 2, characterized in that the hydrazide is chosen from: a) monohydrazides of formula RiCONHNH ₂ in which R 1 represents an alkyl radical or an aryl radical, a hydrogen atom of said alkyl or aryl radicals being be replaced by a hydroxy group or a halogen atom, and said aryl radical may be substituted by an alkyl radical, b) dihydrazides of formula H ₂ NHN-X-NHNH ₂ in which X represents a radical -CO- or - CO-Y-CO, and Y is an alkylene radical or an arylene radical, a hydrogen atom of said alkylene or arylene radicals may be replaced by a hydroxy group or a halogen atom, and said aryl radical may be substituted by a alkyl radical; c) polyhydrazides such as trihydrazides, tetrahydrazides and polyhydrazides formed from a hydrazide monomer containing a polymerizable group.

9. Canvas according to claim 8, characterized in that the hydrazide is oxalic acid dihydrazide, malonic acid dihydrazide, succinic acid dihydrazide, adipic acid dihydrazide, sebacic acid dihydrazide , maleic acid dihydrazide, fumaric acid dihydrazide, diglycolic acid dihydrazide, tartaric acid dihydrazide, malic acid dihydrazide, isophthalic acid dihydrazide, terephthalic acid dihydrazide, carbohydrazide, citric acid trihydrazide, pyromellitic acid trihydrazide, 1,2,4-benzenethhydrazide, nithloacetic acid trihydrazide, cyclohexane-tricarboxylic acid trihydrazide, ethylenediaminetetraacetic acid tetrahydrazide, 1, 4,5,8-naphthoic acid tetrahydrazide, a poly (acrylic acid hydrazide) or a poly (methacrylic acid hydrazide).

10. Canvas according to claim 2, characterized in that the tannin is a tannin mimosa, quebracho, pine, pecan, hemlock wood or sumac.

11. Canvas according to claim 2, characterized in that the amide is urea, 1,3-dimethylurea, ethyleneurea or its derivatives, biurea, biuret, triuret, acrylamide, methacrylamide, polyacrylamides and polymethacrylamides,

12. Canvas according to one of claims 1 to 11, characterized in that the content of compound capable of trapping formaldehyde ranges from 0.1 to 500 g / m ² , preferably from 0.5 to 100 g / m ² and advantageously from 1 to 50 g / m ² .

13. Canvas according to one of claims 1 to 11, characterized in that it is based on glass fibers and optionally fibers consisting of a thermoplastic organic material.

14. Canvas according to claim 13, characterized in that it is a fabric obtained from glass son composed of a multitude of glass filaments (or base wire) or derived from these son, or mixed yarn comprising at least one glass yarn composed of a multitude of glass filaments and at least one yarn consisting of a multitude of filaments of the abovementioned thermoplastic organic material, or "comed" yarns consisting of glass filaments and of filaments of the above-mentioned organic matter intimately mixed.

15. Canvas according to claim 14, characterized in that it comprises, in warp, a twisted glass yarn and in weft, a glass thread without voluminized torsion and in that the linear density of the warp and weft son varies from 34 to 1500 tex.

16. Canvas according to one of claims 1 to 15, characterized in that it has a weight per unit area ranging from 30 to 1000 g / m ² .

17. A method of manufacturing the painting fabric according to one of claims 1 to 16, wherein the painting is passed through a scarf (3) or device (30), said canvas is dried and collected , characterized in that it comprises a treatment step with an agent capable of trapping formaldehyde.

18. The method of claim 17, characterized in that the treatment comprises introducing said agent into the sizing composition.

19. The method of claim 17, characterized in that the treatment consists in applying said agent after the scarf (3) or the device

(30) and before the painting fabric passes over the drying device (5).

20. The method of claim 19, characterized in that the application is carried out by spraying with an aqueous solution of said agent.