JPH0244348B2 - BOSUISOSEIBUTSU * SONOSEIZOHOHOOYOBISHUJUNOHYOMENNOBOSUIHOGONISHOSURUHOHO - Google Patents

Description

[Detailed description of the invention]

The present invention relates to compositions for waterproofing and protecting various surfaces such as building exteriors, roof tiles, wood, etc., methods for producing them, and methods for using them for surface treatment. Homopolymers of butyl acrylate, ethyl acrylate or methyl acrylate or acrylic acid and/or Aqueous dispersions containing copolymers based on methacrylic acid or their esters, which contain 2 to 5% by weight of silicone in the aqueous phase, based on the weight of the dispersion, are known. It is. U.S. Pat. No. 4,012,355 discloses that film-forming polymers such as styrene-butadiene-acrylic acid or acrylic acid ester terpolymers, polyolefins, vinyl acetate copolymers, acrylic acid or alkyl methacrylate polymers, etc. an aqueous dispersion of the combination and an aqueous or hydrocarbon solution of the silicone;
In particular, when a siliconate aqueous solution is used as a film-forming polymer/
It is known to prevent corrosion of the surfaces of finely divided materials by treatment with compositions containing silicone in a weight ratio of between 12/1 and 1/1. Of particular interest is that compositions based on synthetic polymers used for the treatment of surfaces such as building facades, roof tiles, etc., based on hydraulic binders, exhibit the following properties in addition to being waterproof: . Good film forming properties. Good stability against ultraviolet light. Good stability in alkaline media. That is, it is not sticky or saponified in an alkaline medium, especially at a pH above 10. It has been found that polymers containing carboxy moieties derived from ethylenic monocarboxylic or dicarboxylic acids, for example, are excluded because of their poor stability in alkaline media. The present inventors have discovered that a styrene-alkyl acrylate type copolymer in the form of a dispersion encapsulated in an aqueous medium that is stable at alkaline pH has the properties described below, and that the alkyl acrylate copolymer of the prior art It has been found that substantially higher amounts of waterproofing agents can be combined than are present in compositions based on . The present inventors have discovered a composition with good storage stability. This composition has the following properties. The composition can be easily applied to building envelopes based on hydraulic binders by conventional methods (roll, air gun, etc.), and when dry, the composition combines the adhesion and UV stability of acrylic resins with the surface properties of silicone resins. Together, they form a membrane that can improve the waterproofness of building exteriors. Similarly, it allows waterproofing and treatment of the surface and interior of wood. The composition that is the object of the present invention contains an aqueous dispersion of an alkyl acrylate copolymer and an alkali alkyl siliconate, and the characteristics of this composition are as follows. The aqueous dispersion consists of a film-forming copolymer of an alkyl acrylate and an aromatic vinyl monomer in the form of a dispersion in a basic pH-stable aqueous medium, the aromatic vinyl monomer being A monomer whose corresponding homopolymer exhibits a glass transition point of 70 to 170°C. The amount of alkaline alkyl siliconate present is 0.05 alkyl siliconate per 100 g of dry copolymer.
~0.17 mol. Here, the entities corresponding to "mole" are the following groups. Examples of aromatic vinyl monomers include styrene and methylstyrene. The alkyl acrylates that can be used are monomers whose corresponding homopolymers have glass transition points of +10°C to -60°C. Examples of the alkyl acrylate include those in which the alkyl group has 1 to 8 carbon atoms, preferably 1 to 4 carbon atoms. The amounts of aromatic vinyl monomer and alkyl acrylate used are selected so that the resulting copolymer has a glass transition point of -5°C to +25°C. The amount of monomer used depends on the nature of the comonomer and the glass transition temperature of the desired copolymer. These quantities are described, for example, in Bull.An Phys.Soc. , 1, 123 (1956).
It is easily determined by the FOX equation described in . That is, the styrene-ethyl acrylate copolymer has a styrene/ethyl acrylate ratio of 26/74.
When the ratio is ~45/55, the glass transition point is 0°C to 20°C, and the styrene-propyl acrylate copolymer has a styrene/propyl acrylate ratio of 36/64 to
When it is 52/48, the glass transition point is 0°C to 20°C.
Polystyrene has a glass transition point of +100℃,
The glass transition points of polyethyl acetate and polypropyl acrylate are -24°C and -37°C, respectively. The indicated glass transition temperature values are, for example, A.
Lambert: Measured by "differential scanning calorimetry" described in "Polymer 10, 319 (1969)". Aqueous dispersions of copolymers of aromatic vinyl monomers and alkyl acrylates are obtained by polymerizing these monomers in an aqueous emulsion surrounded by an alkaline pH-stable medium. In addition to the above monomers, the polymerization medium may include various conventionally known emulsion polymerization additives (catalysts, emulsifiers, etc.) selected from those that are stable in the aqueous phase and alkaline medium. Examples of catalysts include cumene and diisopropylbenzene. , organic hydroperoxides such as hydroperoxides such as paramenthane, sodium,
Persulfates such as potassium or ammonium persulfates may be mentioned. Examples of emulsifiers include fatty acid salts, alkyl sulfates, alkyl sulfonates, aryl sulfates, arylsulfonates, alkylaryl sulfates, alkylaryl sulfonates, sulfosuccinates, alkali metal salts of alkyl phosphates, etc. anionic emulsifiers such as
Nonionic emulsifying agents such as polyethoxy aliphatic alcohols, polyethoxy alkyl phenols, polyethoxy fatty acids and the like may be mentioned. The aqueous dispersion of copolymer of aromatic vinyl monomer and alkyl acrylate is 20-60% by weight, preferably
It may contain 40-55% by weight of dry material with a particle size of 0.05-0.5 μm. The dispersion may be diluted depending on the nature of the surface to be treated. Alkali alkyl siliconates that can be used in the waterproofing composition of the present invention are those having _C1 - _C3 alkyl groups. The preferred amount of alkyl siliconate used is 0.065 to 0.1 mol per 100 g of copolymer. Suitable alkyl siliconates are: Sodium methyl siliconate in a proportion of 4.8 to 16.3 parts by weight, preferably 6.4 to 9.8 parts by weight of dry methyl siliconate per 100 parts by weight of dry copolymer. Potutum methyl siliconate in a proportion of 5.6 to 19 parts by weight, preferably 7.44 to 11.4 parts by weight of dry methyl siliconate per 100 parts by weight of dry copolymer. The waterproofing composition of the present invention also contains a pigment, an antifoam agent (of the dimethylpolysiloxane type) to prevent the formation of bubbles following mechanical agitation,
and, in particular, non-saponifiable adhesives, such as ethylene glycol monobutyl ether, diethylene glycol monobutyl ether, ethylene glycol, to optionally lower the minimum temperature for film formation of copolymers of aromatic vinyl monomers and alkyl acrylates. Various additives may be included, such as phenyl ether, propylene glycol phenyl ether, dipropylene glycol phenyl ether or "white spirit" type products with a low content of aromatics. The amount of these adhesives used is 3 to 100 parts by weight of the copolymer dispersion.
About 4 parts by weight is sufficient. As mentioned above, the waterproofing composition of the present invention is well suited for waterproofing wood. "Wood" includes planer waste, thin boards, laminated boards,
A collection of wood-based products such as glued sheet structures, fiberboard, particleboard, and various composite products based on cellulosic materials. As a particularly preferred application, the waterproofing compositions according to the invention may further contain up to 7% by weight of the total weight of the composition of wood protectants of the fungicide and/or insecticide type. The fungicide is chosen from those customarily used in treating wood to combat attack by mushrooms, molds and rotting fungi. Examples of insecticides include:
Halogen derivatives of phenols, such as tetrachlorophenol and pentachlorophenol, metal salts, especially salts of copper, manganese, cobalt, chromium, zinc, derivatives of carboxylic acids, such as heptanoic acid, octanoic acid and naphthenic acid, such as bistributyltin. oxide, tributyltin fluoride,
organotin complexes such as tributyltin phosphate, tributyltin benzoate or tributyltin acetate;
Examples include methylene bisthiocyanate, mercaptobenzothiazole, and dichlorofluanid (N-dichlorofluoromethylthio-N',N'-dimethyl-N-phenylsulfamide). These may be present up to 5% by weight of the treatment composition. This amount will of course depend on the activity of the fungicide used. The insecticide is selected from those commonly used in treating wood to prevent insect damage to the wood. Organic compounds such as DDT (dichlorodiphenyltrichloroethane), methoxychlor (dimethoxydiphenyltrichloroethane), lindane (isomer of hexachlorocyclohexane), chlordane (octachlorohexahydromethanoindene), aldrin (endohexachlorohexahydrodimethanonaphthalene, toxaphene) Halogen compounds, such as diethion (O,O,O',O'-tetraethyl S,S'-methylenedithiophosphate), parathion (O,O-diethylparanitrophenylthiophosphate), phosalone (O,O
-diethyldithiophosphorylmethyl-3chloro-
Organophosphorus compounds such as sevin (naphthityl N-methyl carbamate), carbamates such as carbofuran (dimethyldihydrobenzofuranyl N-methyl carbamate), e.g. decamethrin (α-cyano phenoxybenzyl dibromovinyl) dimethylcyclopropane carboxylate), permethrin (phenoxybenzyl cis-trans
Dimethyl dichlorovinyl cyclopropane carboxylate, fenvalerate (α-cyano
synthetic birethrinoids such as phenoxybenzyl chlorophenyl methylbutyl butyrate). These may be present up to 2% by weight of the treatment composition. This amount will of course depend on the activity of the insecticide used. Particularly important active ingredients consist of the following combinations (per 100 parts by weight of active ingredient): 70 to 98 parts by weight of fungicides consisting of tetrachlorophenol and/or pentachlorophenol and/or organotin complexes optionally mixed with dichlorofluanid; lindane and/or phosalone and/or sevin and/or permethrin and/or 30 to 2 parts by weight of an insecticide consisting of fenparelate. The dry material content of the waterproofing compositions according to the invention, optionally with the addition of fungicides and/or insecticides, is between 2 and 50% by weight, preferably between 4 and 25%, depending on the nature of the surface to be waterproofed. The present invention also provides a method for manufacturing the above waterproof composition. The process consists of mixing the various constituents and optionally various charges and additives according to the proportions mentioned above. The alkali alkyl siliconate is preferably introduced in the form of an aqueous solution which can contain up to 50% by weight of dry material. The fungicides and insecticides that are optionally used are encapsulated in an aqueous medium constituted by an aqueous dispersion of the copolymer and an alkali alkyl siliconate, either neat or preferably when they are in liquid form. is introduced dissolved in an organic solvent or a solvent mixture. Among the solvents that can be used, liquids such as chlorobenzene, dichlorobenzene, toluene, xylene or aromatic hydrocarbon mixtures obtained directly by distillation of petroleum oils such as kerosene in the distillation fraction between 100 °C and 300 °C; Aromatic hydrocarbons, such as monoalcohols such as cyclohexanol, glycols such as ethylene glycol, diethylene glycol, propylene glycol, butylene glycol, hexylene glycol, diglyme, butoxyethanol, polyols or these alkanols. ethers,
aliphatic ketones such as ethyl amyl ketone, diisoptyl ketone, butyl phthalate or nonyl phthalate, or esters such as dimethyl or diethyl esters of succinic acid, adipic acid, oxalic acid or malonic acid; Examples include amides such as dimethylformamide or dimethylacetamide. These can be used as a single solvent or as a mixture of two or more solvents. A particularly important use of the active ingredient enclosed in an aqueous medium consisting of an aqueous dispersion and an alkali alkyl siliconate consists in introducing the active ingredient via a concentrate of the following composition which can be emulsified in water. The active ingredients consist of fungicides and/or insecticides. The liquid dissolution medium consists of at least one organic solvent for the active ingredient, an anionic surfactant and optionally at least one oil and/or at least one fixing agent. A particularly suitable concentrate is the French patent application no.
It is described in No. 2498419. It contains per 100 parts by weight of concentrate: 15-40 parts by weight of active ingredient; 30-75 parts by weight of solvent for the active ingredient; 0-20 parts by weight of oil and/or fixing agent; 5-25 parts by weight of anionic surfactant. The surfactant included in the composition of the concentrate is selected from the following. a Sulfuric acid ester of formula () R-(OCH ₂ CH ₂ ) _o -OSO ₃ M () where R is an aliphatic (direct) ester which may contain one or more saturated or unsaturated heteroatoms. (chain or branched), alicyclic or aromatic group. n is the HLB value of the surfactant from 10 to
Indicates a numerical value fixed to a value such as 16. M represents an inorganic or organic residue selected so that the surfactant is soluble in the concentrate to be emulsified and in water. b Organic phosphorus ester of formula () (In the formula, R and n have the same meaning as in formula (). R ₁ represents M ₁ or R-(OCH ₂ CH ₂ ) _o -, and R ₁ and R-(OCH ₂ CH ₂ ) _o - May be the same or different. M ₁ is a hydrogen atom or a formula ()
It has the same meaning as M in . The two M ₁ (when R ₁ =M ₁ ) may be the same or different. ) The HLB (hydrophilic part/lipophilic part balance) is a well-known size in the field of emulsifiers. For more information, KIRK
−OTHMER Encyclopedia of chemistry
See Technology 3rd edition, Vol. 8, pp. 910-915 (1979). Preferably the above compounds have formulas () and ()
, R is 1 or 2 or more carbon atoms
For straight chain or branched alkyl groups having 1 to 20 carbon atoms which may be substituted with 5 alkoxy groups or phenyl groups, alkyl carbonyl groups where the alkyl group is defined as above, and the above alkyl groups. Indicates a cycloalkyl group having 5 to 8 carbon atoms, which may be substituted as shown, or an alkylphenyl group in which the alkyl moiety is linear or branched and has 1 to 20 carbon atoms, and M (formula () represents an ammonium group or an alkali _{metal atom} , and M ₁ represents a hydrogen atom, an ammonium group, _or an alkali metal _atom . In the formula, R ₂ , R ₃ , R ₄ and R ₅ are the same or different and represent a hydrogen atom, an alkyl group or a hydroxyalkyl group.The two alkyl groups may together contain an oxygen atom. The total number of carbon atoms in the ammonium group is 6 or less. In the above preferred emulsifier, in formulas () and (), R has 6 to 6 carbon atoms. 20 straight-chain alkyl group, or an alkylcarbonyl group in which the alkyl moiety is a straight-chain alkyl having 6 to 20 carbon atoms, M
Particularly preferred are surfactants in which (formula ()) represents an ammonium group or a sodium atom, and M ₁ (formula ()) represents a hydrogen atom, an ammonium group, or a sodium atom. The following compounds are exemplified. a Sulfate ・CH ₃ −(CH ₂ ) ₁₀ −CH ₂ −(OCH ₂ CH ₂ ) _o −
OSO ₃ NH ₄・CH ₃ −(CH ₂ ) ₁₀ −CH ₂ −(OCH ₂ CH ₂ ) _o −
OSO ₃ Na ・CH ₃ −(CH ₂ ) ₁₁ −CH ₂ −(OCH ₂ CH ₂ ) _o −
OSO ₃ NH ₄・CH ₃ − (CH ₂ ) ₁₂ −CO− (OCH ₂ CH ₂ ) _o −
_{OSO3NH4 _} In the above formula, n is 1-10. b Phosphate ・CH ₃ −(CH ₂ ) ₁₀ −CH ₂ −(OCH ₂ CH ₂ ) _o −
OPO ₃ (M ₁ ) ₂・CH ₃ −(CH ₂ ) ₁₀ −CH ₂ −(OCH ₂ CH ₂ ) _o −
O〕 ₂ PO ₂ M ₁・CH ₃ −(CH ₂ ) ₁₁ −CH ₂ −(OCH ₂ CH ₂ ) _o −
OPO ₃ (M ₁ ) ₂・ [CH ₃ −(CH ₂ ) ₁₁ −CH ₂ −(OCH ₂ ) _o −O]
₂ PO ₂ M ₁ In the above formula, n is 1 to 10, and various M ₁ are the same or different, and are H, NH ₄ , NH ₂ (C ₂ H ₄ OH),
Indicates NH _{( C2H4OH} ) ₃ or Na. The above-mentioned solvents can be used as the solvent for the active ingredient. From the oils that can be used to prepare the dissolution medium, in particular vegetable oils, such as linseed oil, soybean oil, pine oil, tallow oil, mixtures of terepinols;
Examples include mineral oils such as sewing machine oil, which is a distillation fraction of petroleum between kerosene and paraffin. Examples of suitable adhesives for fixing treatments to wood include amidon, carboxymethyl cellulose, colophonium fat or colophonium fat ester, gum arabic, polyvinyl alcohol, humic acid, glycerophthalic resins, petroleum fractions rich in indene. Examples include the above-mentioned hydrocarbon resins consisting of low molecular weight polymers of aliphatic and/or aromatic unsaturated hydrocarbons formed by cracking. The present invention also provides a method of using the above compositions for waterproofing various surfaces of molds such as building cladding, tiles, wood, etc. made of hydraulic binders. The treatment of building facades and roof tiles can be carried out particularly easily by spraying the compositions described above, either as such or after dilution with water, using a paint roll or an air gun. In order to obtain good waterproofing and protection, the amount of composition applied to the surface is generally about 20 to 80 g/m ² . The treated substrate acquires waterproof properties very rapidly, in the order of 1 hour after application. The waterproofing composition, optionally containing fungicidal and/or insecticidal active ingredients, can be applied to the wood by the customary methods used for the treatment of wood and its derivatives, such as dipping, brushing, vacuuming, etc. below and/
Alternatively, an impregnation method in an autoclave under pressure can be used. A particularly preferred method is a method called the double vacuum method. The amount of the composition used when treating wood depends on the impregnation method chosen. That is, when impregnation is carried out by dipping, the amount of composition used, expressed in grams of total composition per m ² of treated surface, is of the order of 50 to 300 g/m ² . When applying the composition to the surface with a brush, an amount of the composition of about 20 to 80 g/m ² is sufficient. If the impregnation is carried out in an autoclave under double vacuum, 8-40 Kg/
Amounts of composition of the order of m ² are suitable. The present invention will be described in more detail below with reference to Examples, but the present invention is not limited to these Examples. Examples 1-6 Preparation of waterproofing compositions The following properties: Styrene/butyl acrylate weight ratio: approx.
50/50 ・ Dry extract content: Approx. 50% ・ Emulsifying agent: Sodium alkyl sulfonate and alkyl phenoloxyethylene ・ Catalyst: Ammonium persulfate ・ Particle size: 0.05 to 0.40 μm ・ Minimum temperature for film formation: 16℃ ・Viscosity: 50m, Pa, S (measured at 50t/min at 20℃ using a Burckfield viscometer)
The following properties of 100 parts by weight of an aqueous dispersion of styrene-butyl acrylate copolymer having the following properties of the parts by weight shown in the table: - Dry extractable content: approximately 47% - Density (20°C): 1.34 - Alkali titer: Mix with an aqueous solution of potassium methyl siliconate having 18% (K ₂ O). The viscosity of the mixture thus obtained is shown in the table (at 20 °C using a Bruckfield viscometer).
(measured at 50t/min). Storage Stability No increase in the viscosity of the composition obtained as described above is observed after storage for one year at ambient temperature.
Stability in alkaline media The composition prepared according to Example 5 was heated at 40°C for one hour.
I kept it. The following things were confirmed. There is no increase in viscosity. The amount of saponified butyl acrylate, expressed as % by weight relative to the weight of butyl acrylate, is:
Less than 0.1% (measured by free butanol content). Waterproofing of the membrane This property is determined by the contact angle θ of a water droplet placed on the surface of the test sample (glass) J, J. BIKERMAN:
"Physical Surfaces", p. 251, Academic Press, New York (1970), as determined by measurements in degrees (°). The results of this measurement are shown in the table. Example 7 Instead of an aqueous dispersion of styrene-butyl acrylate copolymer, the following properties: Styrene/ethyl acrylate weight ratio: 41/
A composition was prepared in the same manner as in Example 5, except that styrene-ethyl acrylate having a dry extract: about 50% and a minimum film formation temperature of about 16°C was used. The properties of this composition are shown in the table. Example 8-11 (Comparative Example) A composition having the following composition is prepared. Aqueous dispersion of styrene-butyl acrylate-acrylic acid terpolymer with a weight ratio of styrene/butyl acrylate/acrylic acid of approximately 47/49/4, a dry extractable content of approximately 50%, and a minimum film formation temperature of approximately 16°C. liquid 100
parts by weight, and the aqueous solutions of potassium methyl siliconate described in Examples 1 to 5 in the parts by weight shown in the table. The properties of this composition are shown in the table. It has been found that such compositions have too high a viscosity and are therefore difficult to use and cannot even be used in application studies.

【table】

[Table] ** Viscosity exceeds the viscosity that can be measured by the device. Products that cannot be developed using conventional methods.
Examples 12 and 13 Preparation of waterproofing compositions The following properties: Styrene/butyl acrylate weight ratio: approx.
50/50 ・ Dry extract content: Approx. 50% ・ Emulsifying agent: Sodium alkyl sulfonate and alkyl phenoloxyethylene ・ Catalyst: Ammonium persulfate ・ Particle size: 0.05-0.40 μm ・ Minimum temperature for film formation: 16℃ ・ Viscosity : 100 parts by weight of an aqueous dispersion of styrene/butyl acrylate copolymer with a viscosity of 50 m.Pa.S (measured at 50 t/min at 20°C using a Burckfield viscometer) The following properties: Contains dry extractables Amount: approx. 47% Density (at 20°C): 1.34 Alkali titer: 18% (K ₂ O) 10 parts by weight of an aqueous solution of potutacium methyl siliconate, 3.5 parts by weight of butyl diglycol, by Rhone-Planck commercially available
Mix 0.15 parts by weight of RHODOSIL 416 as an antifoaming agent and sufficient water to obtain a dry extractable amount of 20% in Example 12 and 4% in Example 13. Waterproofing test Chestnut wood plaques (not dense with a bulk density of 0.15 to 0.2) with dimensions of 40 x 15 x 4 mm or 60 x 30 x 6 mm are prepared with a norm of NF x 40-500 (page 26, columns 3, 3, and 4). Therefore, it was subjected to the regulated peripheral impregnation test. A 20 volume autoclave, 1500 g of plaque and the waterproofing composition prepared above are used. a Impregnation cycle The impregnation cycle is as follows. Initial vacuum: 650 mb for 10 minutes Impregnation: 10 minutes Final vacuum: 650 mb for 45 minutes The amount of composition absorbed by 100 g of wood is shown in the table. b. Water re-uptake cycle The thus treated plaque was air-dried for 4 hours.
Then soak in water for 2 hours. Drain the plaque and measure water reuptake by weight change. The results obtained are shown in the table. c Wash-off behavior After the water re-uptake cycle the plaques are dried for one week and then soaked in water for 2 hours. Drain the plaque and measure water reuptake. The results obtained are shown in the table. The table also shows, for comparison, the results obtained using untreated plaques and plaques treated with a 10% white spirit solution of silicone oil 47V100 marketed by Rhone-Planck. As a result of the above test, the following was confirmed. Plaques treated with silicone oil are cycled C.
There is less washing off. Plaques treated with the compositions of the present invention not only did not wash out in cycle c, but their waterproof properties were further improved. Within the limits of the above test, the influence of the concentration of the dry extract of the waterproofing composition on water reuptake is not significant. Example 14 The waterproofing test described in Example 13 was repeated using 15 parts by weight of the waterproofing composition instead of 10 parts by weight.
However, this waterproof composition has a dry extract content of 4%.
It contains enough water to make it. The results of the waterproof test are shown in the table. The waterproof properties obtained are improved over those obtained in Example 2. Example 15 Preparation of waterproofing composition 100 parts by weight of styrene-butyl acrylate latex used in Examples 12 and 13 10 parts by weight of methyl siliconate solution used in Examples 12 and 13 3.5 parts by weight of butyl diglycol 8.25% by weight of a waterproofing agent dispersion with a dry extract content of 48.5% prepared from 0.15 parts by weight of RHODOSIL 416; 27.3 parts by weight of pentachlorophenol; 4.8 parts by weight of lindane; 22.7 parts by weight of orthodichlorobenzene. - 25.8 parts by weight of hexylene glycol - 8.1 parts by weight of an ester of collophonium fat and pentaerythritol, commercially available under the name DERTOLINEP from Derivé Resinique et Terpenique, and - CH ₃ − (CH ₂ ) ₁₁ − CH ₂ − (OCH ₂ CH ₂ ) ₃ −
9% by weight of an emulsifiable concentrate prepared from 11.3 parts by weight of emulsifier of OSO ₃ NH ₄ ; - 4% dry extract of the waterproofing agent dispersion; - 2% pentachlorophenol; and - per 100 g of total composition. 0.4% lindane is mixed with 82.75% by weight of water to give a total composition of 100g. The waterproof composition thus prepared is stable under normal conditions of use. Waterproof test Sylvester pine sample (cross section 5 x 5
cm, length 30 cm) was immersed for 3 minutes in the composition prepared as above. The average absorption is about 30Kg/ ^cm3 . - Water re-uptake cycle Samples are air-dried for 4 hours, soaked in water for 2 hours, and then drained. Water reuptake was 12%. The results of a similar test on untreated samples were
It was 20%. - Wash-off cycle: Samples were subsequently air-dried for one week, soaked in water for 2 hours, and then drained. Water reuptake for the treated sample was 8%, compared to 25% for the untreated sample. Moldicidal test Sylvester pine wood samples and beech wood samples were subjected to the NF×41-552 test, which corresponds to European Norm 113, which is the standard for evaluating wood preservation products against the mushroom Passidiomycetes lignivores. . As a result, the samples treated with the above composition showed that Coniophora buteana, Coriolus versicolor, Poria placenta and Gleophyllum.
It showed an average mass loss of less than 3% when exposed to Trabeum attack.

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Claims (1)

[Scope of Claims] 1. An aqueous dispersion of an alkyl acrylate having an alkyl group having 1 to 8 carbon atoms and an aromatic vinyl monomer in the form of a dispersion encapsulated in an aqueous medium that is stable to basic pH. The aromatic vinyl monomer is composed of a film-forming copolymer whose corresponding homopolymer has a glass transition point.
70 to 170°C, and the copolymer with the alkyl acrylate exhibits a glass transition point of -5°C to +25°C, and the amount of alkali alkyl siliconate present is a dry copolymer. A waterproofing composition comprising an aqueous dispersion of an alkyl acrylate-containing copolymer and an alkali alkyl siliconate, characterized in that the alkyl siliconate content is 0.05 to 0.17 mol per 100 g. 2. The aqueous dispersion of the copolymer of the alkyl acrylate and the aromatic vinyl monomer contains 20 to 60% by weight of dry material having a particle size of 0.05 to 0.5 μm. Composition. 3. A composition according to claim 1, further comprising up to 7% by weight, based on the total weight, of active ingredients consisting of fungicides and/or insecticides. 4 70 to 98% by weight of a fungicide whose active ingredients are tetrachlorophenol and/or pentachlorophenol and/or an organotin complex optionally mixed with dichlorofluanid; lindane and/or phosalone; 4. A composition according to claim 3, in combination with 30 to 2% by weight of an insecticide consisting of sevin and/or permethrin and/or fuenvalerate.