NL2013822B1 - A paint composition, a method of shielding a substrate, a use of a paint composition for shielding a substrate, and a painted substrate. - Google Patents

A paint composition, a method of shielding a substrate, a use of a paint composition for shielding a substrate, and a painted substrate. Download PDF

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Publication number
NL2013822B1
NL2013822B1 NL2013822A NL2013822A NL2013822B1 NL 2013822 B1 NL2013822 B1 NL 2013822B1 NL 2013822 A NL2013822 A NL 2013822A NL 2013822 A NL2013822 A NL 2013822A NL 2013822 B1 NL2013822 B1 NL 2013822B1
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weight
paint composition
substrate
range
mbq
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NL2013822A
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Dutch (nl)
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NL2013822A (en
Inventor
Ijdema Hermanus
Eijkenboom Antonius
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Pp&C Tech B V
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Priority to NL2013822A priority Critical patent/NL2013822B1/en
Priority to PCT/EP2015/076200 priority patent/WO2016078966A1/en
Publication of NL2013822A publication Critical patent/NL2013822A/en
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Publication of NL2013822B1 publication Critical patent/NL2013822B1/en

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D131/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an acyloxy radical of a saturated carboxylic acid, of carbonic acid, or of a haloformic acid; Coating compositions based on derivatives of such polymers
    • C09D131/02—Homopolymers or copolymers of esters of monocarboxylic acids
    • C09D131/04—Homopolymers or copolymers of vinyl acetate
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F1/00—Shielding characterised by the composition of the materials
    • G21F1/02—Selection of uniform shielding materials
    • G21F1/023—Liquids
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F1/00—Shielding characterised by the composition of the materials
    • G21F1/02—Selection of uniform shielding materials
    • G21F1/10—Organic substances; Dispersions in organic carriers

Abstract

A paint composition comprising an aqueous emulsion of a polymer and a filler comprising mica; a method of shielding a substrate comprising a source of thoron, which method comprises applying a layer of the paint composition adjacent to the substrate; a use of the paint composition for shielding a substrate comprising a source of thoron; a shielded substrate comprising a substrate comprising a source of thoron, and adjacent to the substrate a hardened paint layer which is obtainable by hardening a layer of the paint composition.

Description

A PAINT COMPOSITION, A METHOD OF SHIELDING A SUBSTRATE,
A USE OF A PAINT COMPOSITION FOR SHIELDING A SUBSTRATE, AND
A PAINTED SUBSTRATE
The invention relates to a paint composition. The invention also relates to a method of shielding a substrate which substrate comprises a source of thoron. The invention also relates to a use of the paint composition for shielding the substrate. The invention also relates to a shielded substrate comprising the substrate and a hardened paint layer.
Buildings in which people live or work may comprise walls, ceilings or floors which have been constructed from building materials having, for example, a mineral origin. Examples of building materials having a mineral origin are concrete, rock and gypsum. Other building materials of relevance to this invention include, for example, loam, clay, turf, or dung. Such building materials may include small amounts of naturally occurring elements which have a high atomic number and which show a slow radioactive decay with formation of various decay products. When such decay products are gaseous, they may be emitted from the walls, ceilings or floors into the interior of the buildings. Radon and thoron are such gaseous decay products. Radon and thoron are radioactive isotopes.
The emission of radioactive isotopes into the interior of buildings is considered to represent a health risk to people who live or work in such interiors. In particular the emission of thoron is considered dangerous, because thoron has a half-life of about 55 seconds, and may therefore decay to a substantial extent before it is removed from the interior by ventilation, whether natural or forced ventilation. Radon has a half-life about 3.8 days and may be effectively removed from the interior before substantial decay.
There is a desire to find a method of preventing emissions of thoron from walls, ceilings or floors into the interior of buildings.
The present invention provides a paint composition comprising an aqueous emulsion of a polymer and a filler comprising mica.
The present invention also provides a method of shielding a substrate comprising a source of thoron, which method comprises applying a layer of a paint composition adjacent to the substrate, wherein the paint composition comprises an aqueous emulsion of a polymer and a filler comprising mica.
The present invention also provides a use of a paint composition for shielding a substrate comprising a source of thoron, wherein the paint composition comprises an aqueous emulsion of a polymer and a filler comprising mica.
The present invention also provides a shielded substrate comprising - a substrate comprising a source of thoron, and - adjacent to the substrate a hardened paint layer which is obtainable by hardening a layer of a paint composition comprising an aqueous emulsion of a polymer and a filler comprising mica.
Without wishing to be bound by theory, it is believed that the hardened paint layer provides a barrier to thoron to such an extent that a considerable portion, if not all, of the thoron decays inside the hardened paint layer before it has reached the interior of the building. In this way substantial, if not complete, shielding in respect of thoron is achieved.
The invention may be applied in association with any building in which people spend time, for example, for living or working. Examples of such buildings are domestic houses, offices, factories, workshops and hospitals. The substrate may be any wall, floor or ceiling of such a building, or a portion of such a wall, floor or ceiling. In particular, the substrate may be adjacent to the interior of the building. The substrate may include separation walls, exterior walls and inner walls of cavity walls.
The substrate comprises a source of thoron. Thoron may be designated 220Rn. Sources of thoron may be thorium or radium. The substrate may be based on, for example, gypsum, concrete, rock, loam, clay, turf, or dung. The substrate may comprise, for example, blocks, board or plaster. Useful substrates may be formed from, or may comprise, gypsum blocks, gypsum board, gypsum plaster, concrete slabs, or concrete blocks. Typically the substrate as such may exhibit a thoron exhalation rate, expressed in mBq/(m2.s), of at least 0.5 mBq/(m2.s), in particular at least 1 mBq/(m2.s), more in particular at least 2 mBq/(m2.s), typically at least 4 mBq/(m2.s), and more typically at least 6 mBq/(m2.s). In the normal practice of this invention, the substrate as such may frequently exhibit a thoron exhalation rate of at most 5000 mBq/(m2.s), in particular at most 2000 mBq/(m2.s), more in particular at most 1000 mBq/(m2.s), typically at most 800 mBq/(m2.s), and more typically at most 600 mBq/(m2.s).
As used herein, thoron exhalation rate is as measured by the method known from G. De With, P. De Jong and A. Röttger, “Measurement of thoron exhalation rates from building materials”, Health Physics Society, 107 (3) pp. 206 - 212 (2014), wherein the method involves conditioning four 0.15 x 0.15 x 0.15 m3 test samples at 20 °C and 50 % relative humidity as described therein, and arranging the four conditioned samples in the exhalation chamber for exhalation rate measurement under the Standard test conditions as defined therein.
The invention provides for applying a layer of a paint composition adjacent to the substrate. The layer of the paint composition may be applied between the interior of the building and the substrate. Typically, the layer of the paint composition may applied onto the substrate. As an alternative, it may be that the substrate has been covered with a finishing layer, in which case the layer of the paint composition may applied onto the finishing layer, so that the finishing layer is a layer intermediate between the substrate and the layer of the paint composition. Examples of such finishing layers may be wall paper, or wood panelling. It is conceivable that the paint composition is applied in accordance with this invention after the relevant wall, floor or ceiling has been constructed. It is also conceivable that the paint composition is applied before the wall, floor or ceiling has been constructed, for example the paint composition is applied onto gypsum blocks, gypsum board, concrete slabs, or concrete blocks after manufacture of the blocks, the board or the slabs before they are used in the construction of the wall, floor or ceiling.
The paint composition comprises an aqueous emulsion of a polymer. The polymer may be a cross-linkable polymer, in which case the hardening process comprises the chemical process of forming cross links between polymer chains. Examples of cross-linkable polymers may be poly(vinyl acrylate)s or epoxy resins. Preferably, the polymer comprises a non-cross-linkable polymer, in which case the hardening process is basically a physical process comprising the evaporation of water present in the paint composition. It is an advantage of the non-cross-linkable polymers, compared with the cross-linkable polymers, that they provide for a hardened paint layer which is more permeable to moisture from the substrate, with relatively little detriment to the shielding effect in respect of thoron.
Examples of suitable non-cross-linkable polymers for use in this invention are poly(alkyl acrylate)s, polyurethanes, and poly(alkyl methacrylate)s. Preferred non-cross-linkable polymers are poly(vinyl acetate)s and ethylene/vinyl acetate copolymers.
Preferably, the ethylene/vinyl acetate copolymers comprise monomer units based on vinyl acetate in a quantity of at least 60 %w, more preferably at least 70 %w, and preferably at most 98 %w, more preferably at most 96 %w, based on the weight of the copolymer. Preferably, the ethylene/vinyl acetate copolymers comprise monomer units based on ethylene in a quantity of at least 2 %w, more preferably at least 4 %w, and preferably at most 40 %w, more preferably at most 30 %w, based on the weight of the copolymer. Other monomer units, for example based on propylene, styrene, an alkyl acrylate, or acrylonitrile, may be present, typically in a quantity of at most 10 %w, more typically at most 5 %w, based on the weight of the copolymer.
The minimum film forming temperature of the polymer may typically be at least -2 °C, more typically at least 3 °C, and preferably at least 10 °C. In the normal practice of this invention, the minimum film forming temperature of the polymer may typically be at most 20 °C, and more typically at most 15 °C. The minimum film forming temperature may also be referred to by the abbreviation “MFFT”. As used herein, the minimum film forming temperature is as measured according to UNI 8490-14.
The polymer for use in this invention may be supplied in the form of an aqueous emulsion. Such emulsions may comprise water in a quantity in the range of from 20 to 80 %w, more typically from 30 to 70 %w, in particular from 40 to 60 %w, relative to the weight of the aqueous emulsion. Such emulsions may comprise the polymer in a quantity in the range of from 20 to 80 %w, more typically from 30 to 70 %w, in particular from 40 to 60 %w, relative to the weight of the aqueous emulsion. For example, an aqueous emulsion of an ethylene/vinyl acetate copolymer is available from WACKER CHEMIE A.G., Münich, Germany, as VINNAPAS 401 dispersion (WACKER and VINNAPAS 401 are trademarks), from VINAVIL S.p.A., Milan, Italy, as VINAVYL EVA 04 emulsion and VINAVYL EVA 09 emulsion (VINAVIL, VINAVYL EVA 04 and VINAVYL EVA 09 are trademarks), or from CELANESE Campany as VINAMUL 1404 emulsion or MOWILITH DM 105 emulsion (CELANESE, VINAMUL 1404 and MOWILITH DM 105 are trademarks). For example, an aqueous emulsion of a poly(vinyl acetate) is available from CELANESE Company, as VINAMUL 8481 emulsion.
In accordance with the invention, the paint composition comprises, in addition to the aqueous emulsion of the polymer, a filler comprising mica.
The mica component of the filler is typically a phyllosilicate mineral having a layered or platy structure. The particle size distribution may be assessed by means of a sieve analysis. For use in this invention, the mica component comprises typically a particle size distribution such that - at most 0.1 %w of the particles, more typically in the range of from 0.001 to 0.05 %w of the particles, is retained on a 100 MESH sieve; - using the particles passing the 100 MESH sieve, at most 10 %w of the particles, more typically in the range of from 0.05 to 8 %w of the particles, is retained on a 200 MESH sieve; - using the particles passing the 200 MESH sieve, at most 15 %w of the particles, more typically in the range of from 0.05 to 12 %w of the particles, is retained on a 325 MESH sieve; and - more than 80 %w of the particles, preferably in the range of from 85 to 100 %w of the particles, can pass the 325 MESH sieve, wherein %w is relative to the total weight of the particles subjected to the sieve analysis, and the MESH sieves and the sieve analysis are according to ASTM Ell.
Suitable mica components for use in this invention are known in the art. Preferably water ground mica 325 mesh may be employed, which is commercially available from Mahlwerk Neubauer-Friedrich Geffers GMBH., Hamburg, Germany.
In addition to mica, the filler may comprise inorganic microbeads. The use of a filler comprising inorganic microbeads as an additional component may be preferred as paint compositions comprising inorganic microbeads have a relatively low viscosity and may be processed relatively easily into thin layers. The inorganic microbeads may be employed as an additional component substantially without detriment to the thoron shielding capability of the hardened paint layer.
The inorganic microbeads for use in this invention may comprise hollow or solid spherical beads. Typically they have a particle size distribution, such that - at most 10 %v of the inorganic microbeads represents beads having a diameter of at most 2 pm, preferably at most 1.5 pm and more preferably at most 1 pm; - at least 50 %v represents beads having a diameter of at most 8 pm, preferably at most 7 pm and more preferably at most 6 pm; and - at least 90 %v represents beads having a diameter of at most 30 pm, preferably at most 27 pm and more preferably at most 24 pm.
The particle size distribution of the inorganic microbeads as specified herein is as it can be measured according to ASTM F751-83 (1997), typically by using a MULTISIZER 3 COULTER COUNTER analyser, available from Beckman Coulter Nederland B.V., Woerden, The Netherlands (MULTISIZER 3 COULTER COUNTER is a trademark).
The inorganic microbeads may be available and suitably applied in the invention as a gray material, or, preferably, as a white material.
The inorganic microbeads for use in this invention are known in the art. They may be, for example, ceramic microbeads or glass microbeads. Ceramic microbeads are generally crystalline materials, whereas glass microbeads are generally non-crystalline materials. The ceramic microbeads may be commercially available from 3M Company, St Paul, Minnesota, USA (3M is a trademark), under the name ZEEOSPHERES microbeads or MICROPSHERE microbeads (ZEEOSPHERES and MICROSPHERE are trademarks). Preferred types of ZEEOSPHERES microbeads are designated G-400. Preferred types of MICROSPHERES microbeads are designated W-610 and W-210. Alternatively, the ceramic microbeads may be hollow alumina silicate based materials, known as cenospheres, which may be available from Plomp Mineral Services B. V.,
Sleeuwijk, The Netherlands. Hollow glass based microbeads may be commercially available from 3M Company, St Paul, Minnesota, USA, under the trademark 3M GLASS BUBBLES.
In addition to mica and optionally the inorganic microbeads, the paint composition may comprise other filler materials, such as diatomaceous earth, talc, chalk, or one or more kinds of calcium alumina silicates, such as feldspar. The total quantity of mica and inorganic microbeads, if any, in the filler may typically be at least 40 %w, more typically at least 50 %w, relative to the weight of the filler.
As the paint composition comprises an aqueous emulsion of a polymer, the paint composition comprises water. The paint composition may comprise one or more diluents in addition to water, such as glycols, for example propylene glycol or butylene glycol; glycol ethers, for example propylene glycol phenyl ether, commercially available from Dow Chemical Company under the trademark DOWANOL PPh glycol ether (DOWANOL is a trademark); and ester alcohols, for example 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, which is commercially available as EASTMAN TEXANOL Ester Alcohol (EASTMAN and TEXANOL are trademarks). Typically, such diluents have a boiling point of at least 150 °C, preferably at least 200 °C, and more preferably at least 220 °C, when measured at a pressure of 0.1 MPa. Such high-boiling diluents have advantageously a relatively low volatility. Typically, such diluents have a boiling point of at most 350 °C, and preferably at most 300 °C, when measured at a pressure of 0.1 MPa.
The paint composition may or may not additionally comprise one or more pigments, surface active components, dispersants, stabilisers, thickening agents, anti foam components, components for pH control, and/or preservatives, such as antibacterial components and fungicides. Dispersants may include dispersants which are available from Elementis Specialties, East Windsor, New Jersey (USA) under the trademark NUOSPERSE W-30. Thickening agents may include, for example, KELZAN S thickening agent (KELZAN is a trademark) from C P KELCO, Genk, Belgium. Preservatives may include 5-chloro-2-methyl-2H-isothiazol-3-one and/or 2-methyl-2H-isothiazol-3-one, which are available as PREVENTOL preservatives from LANXESS Company, New Delhi, India (LANXESS and PREVENTOL are a trademarks), or as MERGAL K14 preservative from TROY Corporation, Florham Park, New Jersey (USA) (MERGAL K14 and TROY are a trademarks), or as KATHON LX150 preservative from DOW CHEMICAL Company (KATHON LX 150 and DOW CHEMICAL are a trademarks).
The quantity of the various components in the paint composition may be selected within wide ranges. Suitably, the polymer may be present in the paint composition in a quantity in the range of from 10 %w to 40 %w, in particular in the range of from 15 %w to 35 %w, relative to the weight of the paint composition. Water may be present in the paint composition in a quantity in the range of from 10 %w to 40 %w, in particular in the range of from 15 %w to 35 %w, on the same basis. Mica and the inorganic microbeads, if any, may be present in the paint composition in a total quantity in the range of from 10 %w to 80 %w, in particular in the range of from 15 %w to 70 %w, on the same basis. The weight ratio of the total quantity of mica and the inorganic microbeads, if any, in the paint composition to the quantity of polymer in the paint composition may typically be in the range of from 0.3 : 1 to 5 : 1, in particular in the range of from 0.4 : 1 to 4 : 1, more in particular in the range of from 0.5 : 1 to 3 : 1. Diluents may or may not be present in the paint composition in a total quantity in the range of from 0 %w to 20 %w, in particular in the range of from 0.1 %w to 15 %w, on the same basis. Fillers, additional to mica and the inorganic microbeads, if any, may or may not be present in the paint composition in a total quantity in the range of from 0 %w to 30 %w, in particular in the range of from 1 %w to 20 %w, on the same basis. Each one of the one or more surface active components, dispersants, stabilisers, thickening components, anti foam components, components for pH control, and preservatives may be present in the paint composition in a quantity in the range of from 0 %w to 5 %w, in particular in the range of from 0.1 %w to 3 %w, on the same basis. Pigments may or may not be present in the paint composition in a total quantity in the range of from 0 %w to 10 %w, in particular in the range of from 0.1 %w to 8 %w, on the same basis.
The paint composition may be prepared by mixing the components, typically by using a high-speed mixer. Additionally, a pebble mill or a ball mill may be employed for homogenizing the composition and/or decrease the particle size. If desired, when an aqueous polymer emulsion is used, water may be added additional to the water already present in the emulsion.
The paint composition may be formed into a layer of the paint composition adjacent to the substrate in any suitable manner. The paint composition may be applied by using a brush or a roller, or the paint composition may be applied by spraying. The hardened paint layer is obtained by hardening the paint composition, as described hereinbefore. The thickness of the layer of the paint composition may be in the range of from 50 to 250 pm, when measured after drying. One or more of such layers may be applied.
The following summarises embodiments of this invention. 1. A paint composition comprising an aqueous emulsion of a polymer and a filler comprising mica. 2. The paint composition of embodiment 1 wherein the polymer comprises a noncross-linkable polymer. 3. The paint composition of embodiment 2 wherein the non-cross-linkable polymer comprises a ethylene/vinyl acetate copolymer. 4. The paint composition of embodiment 3 wherein the ethylene/vinyl acetate copolymer comprises monomer units based on vinyl acetate in a quantity in the range of from 60 %w to 98 %w, in particular in the range of from 70 %w to 96 %w, based on the weight of the copolymer, and comprises monomer units based on ethylene in a quantity in the range of from of 2 %w to 40 %w, in particular in the range of from 4 %w to 30 %w, based on the weight of the copolymer. 5. The paint composition of any of embodiments 1-4, wherein the polymer has a minimum film forming temperature of at least -2 °C, in particular at least 3 °C, and more in particular at least 10 °C, and at most 20 °C, in particular at most 15 °C, wherein the minimum film forming temperature is as measured according to UNI 8490-14. 6. The paint composition of any of embodiments 1-5, wherein the paint composition comprises the polymer in a quantity in the range of from 10 %w to 40 %w, in particular in the range of from 15 %w to 35 %w, relative to the weight of the paint composition. 7. The paint composition of any of embodiments 1-6, wherein the mica has a particle size distribution such that in a sieve analysis according to ASTM Ell - at most 0.1 %w of the particles, in particular in the range of from 0.001 to 0.05 %w of the particles, is retained on a 100 MESH sieve; - using the particles passing the 100 MESH sieve, at most 10 %w of the particles, in particular in the range of from 0.05 to 8 %w of the particles, is retained on a 200 MESH sieve; - using the particles passing the 200 MESH sieve, at most 15 %w of the particles, in particular in the range of from 0.05 to 12 %w of the particles, is retained on a 325 MESH sieve; and - more than 80 %w of the particles, in particular in the range of from 85 to 100 %w of the particles, can pass the 325 MESH sieve, wherein %w is relative to the total weight of the particles subjected to the sieve analysis. 8. The paint composition of any of embodiments 1-7, wherein the paint composition additionally comprises inorganic microbeads, in particular ceramic microbeads. 9. The paint composition of any of embodiments 1-8, wherein the paint composition comprises mica and inorganic microbeads, if any, in a total quantity in the range of from 10 %w to 80 %w, in particular in the range of from 15 %w to 70 %w, relative to the weight of the paint composition. 10. A method of shielding a substrate comprising a source of thoron, which method comprises applying a layer of a paint composition adjacent to the substrate, wherein the paint composition comprises an aqueous emulsion of a polymer and a filler comprising mica. 11. A use of a paint composition for shielding a substrate comprising a source of thoron, wherein the paint composition comprises an aqueous emulsion of a polymer and a filler comprising mica. 12. A shielded substrate comprising - a substrate comprising a source of thoron, and - adjacent to the substrate a hardened paint layer which is obtainable by hardening a layer of a paint composition comprising an aqueous emulsion of a polymer and a filler comprising mica. 13. The shielded substrate of embodiment 12, wherein the sources of thoron is thorium or radium. 14. The shielded substrate of embodiment 12 or 13, wherein the substrate is based on gypsum, concrete, rock, loam, clay, turf, or dung. 15. The shielded substrate of any of embodiment 12 - 14, wherein the substrate exhibits a thoron exhalation rate of at least 0.5 mBq/(m2.s), in particular at least 1 mBq/(m2.s), more in particular at least 2 mBq/(m2.s), typically at least 4 mBq/(m2.s), and more typically at least 6 mBq/(m2.s). 16. The shielded substrate of any of embodiment 12 - 15, wherein the substrate exhibits a thoron exhalation rate of at most 5000 mBq/(m2.s), in particular at most 2000 mBq/(m .s), more in particular at most 1000 mBq/(m .s), typically at most 800 mBq/(m2.s), and more typically at most 600 mBq/(m2.s).
The invention will now be illustrated by means of the following nonlimiting working examples. EXAMPLE 1 (according to the invention) A paint composition was prepared as follows. The paint composition comprises ethylene/vinyl acetate copolymer as the polymer, which was employed as a polymer emulsion comprising 50 %w polymer and 50 %w water, propylene glycol as the diluent, PREVENTOL preservative (PREVENTOL is a trademark), further components as specified in the Table, and additional water. The polymer emulsion was stirred using a high-speed mixer, while the other components were added. The final composition is as specified in the Table.
Samples of the paint composition are applied to 0.15 x 0.15 x 0.15 m3 blocks of gypsum comprising a source of thoron, using a roller, and air dried, to form about 90 - 95 pm thick hardened paint layers. After storage at ambient conditions for three days and for four months, the blocks of gypsum covered with the hardened paint are subjected to thoron exhalation rate measurements as defined hereinbefore.
Separately, samples of the paint composition were applied to paper sheets of LENETA standard paper type 3NT-4 Regular Bond, available from LENETA Company, Inc., Mahwah, New Jersey (USA) (LENETA is a trademark), using a bar coater, and air dried, to form 150 pm thick hardened paint layers. These coated paper sheets were used for water vapour permeability measurements according to ASTM F-1249-13 using a PERMATRAN-W Model 3/61 test system (PERMATRAN-W is a trademark) available from MOCON, Inc., Minneapolis, Minnesota (USA). The results are provided in the Table. EXAMPLE 2 (according to the invention) EXAMPLE 1 was repeated, except for the following differences. The paint composition comprised 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate as the diluent, ZEEOSPHERES G-400 microbeads obtained from 3M Company (ZEEOSPHERES and 3M are trademarks) as an additional component, and NEOSPERSE W-30 dispersant (NEOSPERSE is a trademark) as the dispersant. Furthermore, the use of talc was omitted and the layer thickness applied in the water vapour permeability measurements amounted to 100 pm, instead of 150 pm. The results are provided in the Table. COMPARATIVE EXAMPLE 3 (not according to the invention)
Thoron exhalation rate measurements and water vapour permeability measurements were carried out on uncoated gypsum blocks and uncoated paper sheets, respectively. The results are provided in the Table.
Table
The EXAMPLES demonstrate that the application of this invention in association with a source of thoron leads to a significantly reduced concentration of thoron in the air present in an area having a wall, ceiling or floor comprising a source of thoron. It is believed that the permeability for thoron relates to the quantity of mica and optionally inorganic microbeads incorporated in the paint composition, relative to the quantity of polymer, and the permeability for water vapour relates to the layer thickness.

Claims (14)

1. Een werkwijze voor het afschermen van een substraat dat een bron van thoron bevat, welke werkwijze het aanbrengen van een aan het substraat aanliggende laag van een verfsamenstelling bevat, waarbij de verfsamenstelling bevat - een waterige polymeeremulsie van een niet-vemetbaar polymeer dat een polyvinylacetaat of een ethyleen/vinylacetaatcopolymeer bevat, en - een mica bevattend vulmiddel.A method of shielding a substrate containing a source of thoron, which method comprises applying a layer of a paint composition adjoining the substrate, the paint composition comprising - an aqueous polymer emulsion of a non-measurable polymer comprising a polyvinyl acetate or an ethylene / vinyl acetate copolymer, and - a mica-containing filler. 2. Een werkwijze volgens conclusie 1, waarin het niet-vemetbaar polymeer een ethyleen/vinylacetaatcopolymeer is.A method according to claim 1, wherein the non-measurable polymer is an ethylene / vinyl acetate copolymer. 3. Een werkwijze volgens conclusie 1 of 2, waarin het ethyleen/vinylacetaatcopolymeer monomeereenheden gebaseerd op vinylacetaat bevat in een hoeveelheid in het gebied van van 60 gewichts-% tot 98 gewichts-%, in het bijzonder in het gebied van van 70 gewichts-% tot 96 gewichts-%, gebaseeerd op het gewicht van het copolymeer, en monomeereenheden gebaseerd op ethyleen bevat in een hoeveelheid in het gebied van van 2 gewichts-% tot 40 gewichts-%, in het bijzonder in het gebied van van 4 gewichts-% tot 30 gewichts-%, gebaseeerd op het gewicht van het copolymeer.A process according to claim 1 or 2, wherein the ethylene / vinyl acetate copolymer contains vinyl acetate monomer units in an amount in the range of from 60% by weight to 98% by weight, in particular in the range of from 70% by weight up to 96% by weight based on the weight of the copolymer and monomer units based on ethylene in an amount in the range of from 2% to 40% by weight, in particular in the range of from 4% by weight up to 30% by weight based on the weight of the copolymer. 4. Een werkwijze volgens één of meer van de conclusies 1- 3, waarin het polymeer een minimum filmvormingstemperatuur heeft van ten minste -2 °C, in het bijzonder ten minste 3 °C, en meer in het bijzonder ten minste 10 °C, and een minimum filmvormingstemperatuur heeft van ten hoogste 20 °C, in het bijzonder ten hoogste 15 °C, waarbij de minimum filmvormingstemperatuur is zoals kan worden gemeten volgens UNI 8490-14.A method according to any one of claims 1 to 3, wherein the polymer has a minimum film-forming temperature of at least -2 ° C, in particular at least 3 ° C, and more in particular at least 10 ° C, and has a minimum film-forming temperature of at most 20 ° C, in particular at most 15 ° C, wherein the minimum film-forming temperature is as can be measured according to UNI 8490-14. 5. Een werkwijze volgens één of meer van de conclusies 1 - 4, waarin de verfsamenstelling het polymeer bevat in een hoeveelheid in het gebied van van 10 gewichts-% tot 40 gewichtsprocent, in het bijzonder in het gebied van van 15 gewichts-% to 35 gewichts-%, gebaseerd op het gewicht van de verfsamenstelling.A method according to any one of claims 1 to 4, wherein the paint composition contains the polymer in an amount in the range of from 10% by weight to 40% by weight, in particular in the range of from 15% by weight to 35% by weight, based on the weight of the paint composition. 6. Een werkwijze volgens één of meer van de conclusies 1-5, waarin de mica een deeltjesgrootteverdeling heeft die zodanig is dat in een zeefanalyse volgens ASTM Eli - ten hoogste 0.1 gewichts-% van de deeltjes, in het bijzonder in het gebied van van 0.001 to 0.05 gewichts-% van de deeltjes, op een 100 MESH zeef blijft liggen; - van de deeltjes die de 100 MESH zeef passeren, ten hoogste 10 gewichts-%, in het bijzonder in het gebied van van 0.05 to 8 gewichts-%, op een 200 MESH zeef blijft liggen; - van de deeltjes die de 200 MESH zeef passeren, ten hoogste 15 gewichts-%, in het bijzonder in het gebied van van 0.05 to 12 gewichts-%, op een 325 MESH zeef blijft liggen; en meer dan 80 gewichts-% van de deeltjes, in het bijzonder in het gebied van van 85 to 100 gewichts-% van de deeltjes, de 325 MESH zeef passeren, waarin gewichts-% is gebaseerd op het totale gewicht van de deeltjes die in de zeefanalyse zijn gebruikt.A method according to any one of claims 1-5, wherein the mica has a particle size distribution that is such that in a sieve analysis according to ASTM Eli - at most 0.1% by weight of the particles, in particular in the range of from 0.001 to 0.05% by weight of the particles remains on a 100 MESH screen; - of the particles passing through the 100 MESH screen, a maximum of 10% by weight, in particular in the range of from 0.05 to 8% by weight, remains on a 200 MESH screen; - of the particles passing through the 200 MESH screen, at most 15% by weight, in particular in the range of from 0.05 to 12% by weight, remains on a 325 MESH screen; and more than 80% by weight of the particles, in particular in the range of from 85 to 100% by weight of the particles, pass the 325 MESH screen, in which% by weight is based on the total weight of the particles which in the sieve analysis have been used. 7. Een werkwijze volgens één of meer van de conclusies 1 - 6, waarin de verfsamenstelling bovendien anorganische microkorrels, in het bijzonder keramische microkorrels, bevat.A method according to any one of claims 1 to 6, wherein the paint composition additionally contains inorganic microbeads, in particular ceramic microbeads. 8. Een werkwijze volgens één of meer van de conclusies 1 - 7, waarin verfsamenstelling mica en anorganische microkorrels, indien aanwezig, bevat in een totale hoeveelheid in het gebied van van 10 gewichts-% tot 80 gewichts-%, in het bijzonder in het gebied van van 15 gewichts-% tot 70 gewichts-%, gebaseerd op het gewicht van de verfsamenstelling.A method according to any one of claims 1 to 7, wherein paint composition contains mica and inorganic microbeads, if present, in a total amount in the range of from 10% by weight to 80% by weight, in particular in particular range from 15% by weight to 70% by weight, based on the weight of the paint composition. 9. Een werkwijze volgens één of meer van de conclusies 1-8, waarin de bron van thoron thorium of radium is.A method according to any one of claims 1-8, wherein the source is thoron or radium. 10. Een werkwijze volgens één of meer van de conclusies 1 - 9, waarin het substraat is gebaseerd op gips, beton, rots, leem, klei turf of mest.A method according to any one of claims 1 to 9, wherein the substrate is based on plaster, concrete, rock, loam, clay peat or manure. 11. Een werkwijze volgens één of meer van de conclusies 1-10, waarin het substraat een uitademingssnelheid van thoron vertoont van ten minste 0.5 mBq/(m2.s), in het bijzonder ten minste 1 mBq/(m2.s), meer in het bijzonder ten minste 2 mBq/(m2.s), bij voorleur ten minste 4 mBq/(m2.s), en bij meer voorleur ten minste 6 mBq/(m2.s).A method according to any one of claims 1-10, wherein the substrate exhibits a thoron exhalation rate of at least 0.5 mBq / (m2.s), in particular at least 1 mBq / (m2.s), more in particular at least 2 mBq / (m2.s), at least 4 mBq / (m2.s) for front color, and at least 6 mBq / (m2.s) for more front color. 12. Een werkwijze volgens één of meer van de conclusies 1-11, waarin het substraat een uitademingssnelheid van thoron vertoont van ten hoogste 5000 mBq/(m2.s), in het bijzonder ten hoogste 2000 mBq/(m2.s), meer in het bijzonder ten hoogste 1000 mBq/(m2.s), bij voorkeur ten hoogste 800 mBq/(m2.s), en bij meer voorkeur ten hoogste 600 mBq/(m2.s).A method according to any one of claims 1-11, wherein the substrate exhibits a thoron exhalation rate of at most 5000 mBq / (m2.s), in particular at most 2000 mBq / (m2.s), more in particular at most 1000 mBq / (m2.s), preferably at most 800 mBq / (m2.s), and more preferably at most 600 mBq / (m2.s). 13. Het gebruik van een verfsamenstelling voor het afschermen van een substraat, waarbij het substraat en de verfsamenstelling zijn gekozen volgens één of meer van de conclusies 1-12.The use of a paint composition for shielding a substrate, wherein the substrate and the paint composition are selected according to one or more of claims 1-12. 14. Een afgeschermd substraat bevattende - een substraat dat is gekozen volgens één of meer van de conclusies 1 - 12, en - aanliggend aan het substraat een uitgeharde verflaag die verkrijgbaar is door het uitharden van een laag van een verfsamenstelling volgens één of meer van de conclusies 1-12.A shielded substrate comprising - a substrate selected according to one or more of claims 1 to 12, and - adjacent to the substrate a cured paint layer obtainable by curing a layer of a paint composition according to one or more of the claims 1-12.
NL2013822A 2014-11-17 2014-11-17 A paint composition, a method of shielding a substrate, a use of a paint composition for shielding a substrate, and a painted substrate. NL2013822B1 (en)

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* Cited by examiner, † Cited by third party
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EP3747848A1 (en) 2019-06-07 2020-12-09 Marius Bierig Thoron-reducing and room air improving activated carbon admixture for loam plaster systems

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DE102004023374A1 (en) * 2004-05-12 2005-12-08 Celanese Emulsions Gmbh Preservative-free coating compositions, processes for their preparation and their use
KR100605004B1 (en) * 2005-10-24 2006-07-28 (주)나노에이지 Water-soluble paint composition containing illite powder
CN102816471A (en) * 2012-08-09 2012-12-12 衡阳胜玉高科有限公司 Fiber radon-radiation-preventing wall paint

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3747848A1 (en) 2019-06-07 2020-12-09 Marius Bierig Thoron-reducing and room air improving activated carbon admixture for loam plaster systems

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