EP1835510B1 - Verfahren zur Reduzierung des Radons im Inneren von Gebäuden - Google Patents

Verfahren zur Reduzierung des Radons im Inneren von Gebäuden Download PDF

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Publication number
EP1835510B1
EP1835510B1 EP07004830A EP07004830A EP1835510B1 EP 1835510 B1 EP1835510 B1 EP 1835510B1 EP 07004830 A EP07004830 A EP 07004830A EP 07004830 A EP07004830 A EP 07004830A EP 1835510 B1 EP1835510 B1 EP 1835510B1
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EP
European Patent Office
Prior art keywords
bisphenol
building
process according
radon
epoxy resin
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EP07004830A
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English (en)
French (fr)
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EP1835510A1 (de
Inventor
Robert Georges Lacoste
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Bostik SA
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Bostik SA
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    • 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

Definitions

  • the present invention relates to a method of reducing radon inside buildings.
  • Radon is a radioactive gas of natural origin that comes from the decay of uranium and radium contained in the earth's crust, and which naturally occurs in varying amounts depending on the region and soil type.
  • radon in the air inside buildings thus results from the rate of formation of this gas in the ground, but also from the characteristics of the building envelope in contact with the ground, and in particular the presence of cracks. , holes and / or porosity.
  • radon is of particular concern for buildings where people live for long periods of time (houses, schools, public buildings). This radioactive gas can indeed reach concentrations in the air which are likely to represent a risk factor for lung cancer for the occupants of these buildings, especially in the event of simultaneous exposure to tobacco.
  • crosslinkable epoxy resins of bisphenol A type for the preparation of cementitious or concrete substrates which are subjected to capillary rise in moisture from the ground, possibly in prior to the application of smoothing coatings (also called patching) for the installation of floor coverings such as flooring, carpets, plastics or tiles.
  • An object of the present invention is to propose another method of chemical treatment of the interface between the ground and the building, allowing a substantial reduction in the concentration of radon inside the buildings, and in particular to improve the watertightness at this gas from parts of buildings that are in contact or near the ground.
  • Another object of the present invention is to propose a treatment which makes it possible simultaneously to obtain a reduction of radon inside a building and to improve the moisture-proofness of its parts which are in contact with or near the ground.
  • the subject of the present invention is therefore a process for reducing radon in a building whose internal atmosphere is capable of reaching a radon concentration of greater than 100 becquerel per m 3, said process comprising the application on the interior surface of a component of the shell of said building placed in contact with or near the ground, a composition comprising a crosslinkable epoxy resin bisphenol A type and a crosslinking agent, said composition being applied at a rate corresponding to a dose of said resin of between 300 and 1300 g / m 2 , preferably between 400 and 950 g / m 2 .
  • the present method therefore relates to buildings whose internal atmosphere is likely to reach a radon concentration greater than 100 becquerel per m 3 (Bq / m 3 ).
  • a concentration corresponding to an annual average, generally results from an accumulation, in the case of a confined atmosphere, of radon which diffuses into the air from the ground or water, for buildings built in a region whose basement is of granitic and / or volcanic nature. In the case of France for example, the most concerned are Brittany, Corsica, the Massif Central and the Vosges.
  • the determination of the concentration of the radon air is carried out by known measurements of radioactive decays of the radon atoms, by means of a dosimeter.
  • the buildings concerned by the present method are preferably buildings in which people live for long periods of time, such as dwellings, schools, public establishments or premises for professional use. Institutions receiving the public are more particularly preferred.
  • composition used in the process according to the invention comprises one or more crosslinkable epoxy resin (s) of bisphenol A type and one or more crosslinking agent (s).
  • Crosslinkable epoxy resins of bisphenol A type are defined, within the meaning of the present invention, as compounds comprising 2 epoxy groups and obtainable by reaction of haloepoxides such as epichlorohydrin (also called 2- (chloromethyl) oxirane) or ⁇ -methyl-epichlorohydrin with bisphenol A, bisphenol AD or bisphenol F.
  • haloepoxides such as epichlorohydrin (also called 2- (chloromethyl) oxirane) or ⁇ -methyl-epichlorohydrin with bisphenol A, bisphenol AD or bisphenol F.
  • Bisphenol A (or 2,2-bis (4-hydroxyphenyl) propane) has the formula:
  • Bisphenol AD (or 1,1-bis (4-hydroxyphenyl) ethane) has the formula:
  • Bisphenol F bis (4-hydroxyphenyl) methane
  • bisphenol A epoxy resin a mixture of bisphenol A diglycidyl ether (also known as DGEBA) and bisphenol F diglycidyl ether (DGEBF), of respective formulas:
  • crosslinking agents used in the composition used in the present invention are chosen from conventional agents such as aliphatic or aromatic polyamines, acid anhydrides, imidazoles, polymercaptans, pure polyamides or in admixture.
  • crosslinking agent a mixture of modified polyamide and aliphatic polyamine.
  • the crosslinking agent (also called hardener) is present in the composition in an amount expressed as an equivalent number of active hydrogen atoms of the amino group (or other active hydrogen bearing group, depending on the nature of the active agent. crosslinking used) ranging from 0.8 to 1.2, preferably from 0.9 to 1.1 for an equivalent epoxy group present in the crosslinkable epoxy resin.
  • the ratio of the weight of crosslinkable epoxy resin of bisphenol A type to the weight of crosslinking agent is generally between 0.1 and 10, preferably between 1 and 2.
  • composition used may also comprise other ingredients such as a reactive or non-reactive diluent to better control its ease of application, one or more mineral fillers or rheological agents.
  • the mixture can be applied for a period of time of about 20 to 60 minutes from its preparation, at a temperature above 5 ° C, preferably between 10 and 40 ° C.
  • the chemical crosslinking (or polymerization) of the epoxy resin by the hardener during a time of about 24 hours leads to the formation on the support of a layer of cross-linked epoxy resin homogeneous and resistant, and due to its adhesion a very strong bond with the treated support.
  • the amount of composition to be applied per unit area corresponds to a crosslinkable epoxy resin dose of bisphenol A between 450 and 950 g / m 2 .
  • This amount can be applied in one or more layers, preferably in two layers. When applied in 2 layers, the second layer is generally applied 24 hours after the first layer.
  • the preferred structural element for the application of the method according to the invention is a concrete slab coated with a screed.
  • These elements of the structural work generally consist of concrete, mortar, cement, plaster or metal. It is on their internal surface oriented horizontally or vertically towards the interior of the building, raw or possibly equipped with a coating such as an old tile, that the epoxy resin composition of bisphenol A type is applied by common techniques such as roller, squeegee or serrated spatula for horizontal surfaces or brush for vertical surfaces.
  • the method according to the invention may optionally comprise, just after the application of the composition on a horizontal structural element and while the polymerization is not complete, the application of granulometric cutting sand of between 0.2 and 1 mm, in an amount of 3 to 4 kg / m 2 .
  • the figure 1 is a schematic diagram of an experimental device for determining the effectiveness of reducing the radon concentration of air in a sample consisting of a reinforced cement substrate coated with a layer of crosslinked bisphenol A epoxy resin.
  • Such a kit is for example commercially available under the name EPONAL ® 336 of the company Bostik SA, which is a known product to provide the supports in contact or near the ground improved moisture sealing.
  • a master batch is prepared at room temperature by simple mixing of the above two components, at a rate of 100 g of resin per 60 g of hardener, using a whisk mounted on an electric mixer.
  • a 2nd layer of 100 g of the masterbatch was then again applied to the surface previously obtained under the same conditions, without conducting a sandblasting.
  • the total amount of mixture applied to the support therefore corresponds to a dose of crosslinkable epoxy resin of 500 g / m 2 .
  • the plate thus prepared is covered with a crosslinked epoxy resin layer.
  • the weight of this layer (per unit area) is 800 g / m 2 , and its thickness (measured micrometer) is 1.8 mm.
  • the radon from the source (2) is circulated with the pump (3) and mixed with the air in the hemisphere (1).
  • the concentration of radon air in the hemisphere (1) is about 1 million Bq / m 3 .
  • the second hemisphere (6) is fixed on the upper surface of the sample (4) and sealed by the seal (5) as shown on the figure 1 .
  • the radon flux passing through the sample towards the hemisphere (6) is measured by electrostatic deposition (by means of the detector (7) and a suitable electric field) of positively charged ions of polonium-218 and polonium-216 resulting from the decay of radon, then by alpha spectroscopy.
  • the increase in the radon concentration in the hemisphere (6) is recorded as a function of time, the signal obtained being processed by the analyzer (8) and the computer (9).
  • the diffusion length (or relaxation length) is deduced by calculation.
  • a relaxation length of 0.55 mm is thus measured.
  • a layer of resin deposited on the support is radon-tight as long as its thickness is greater than three times the measured relaxation length.
  • Example 1 is repeated by applying to the square support 50 cm by side 100 g of the prepared masterbatch, instead of 200 g, which corresponds to a dose of crosslinkable epoxy resin of 250 g / m 2 .
  • the thickness of the crosslinked epoxy resin layer (whose weight per unit area is 400 g / m 2 ) is 1 mm.
  • This length being less than three times the thickness measured for the layer, it follows that the application to the support of the bisphenol A epoxy resin at the applied dose does not make it radon-tight.

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  • Dispersion Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Epoxy Resins (AREA)
  • Paints Or Removers (AREA)
  • Working Measures On Existing Buildindgs (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Plasma Technology (AREA)
  • Exposure Of Semiconductors, Excluding Electron Or Ion Beam Exposure (AREA)

Claims (11)

  1. Verfahren zur Radonverminderung in einem Gebäude, dessen Raumluft Radonkonzentrationen von mehr als 100 Becquerel pro m3 erreichen kann, wobei das Verfahren das Aufbringen einer Zusammensetzung, die ein vernetzbares Epoxidharz des Typs Bisphenol A und ein Vernetzungsmittel umfasst, auf die Innenfläche eines Rohbauelements des Gebäudes, das mit dem Boden in Kontakt ist oder in dessen Nähe angeordnet ist, umfasst, wobei die Zusammensetzung in einer Dosis aufgebracht wird, die einer Harzdosis von 300 bis 1300 g/m2, vorzugsweise von 400 bis 950 g/m2 entspricht.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass es für ein Gebäude eingesetzt wird, dessen Raumluft Radonkonzentrationen von mehr als 200 Bq/m3 erreichen kann.
  3. Verfahren nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, dass es für ein Gebäude eingesetzt wird, dessen Raumluft Radonkonzentrationen von mehr als 400 Bq/m3, vorzugsweise von mehr als 1.000 Bq/m3, erreichen kann.
  4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass es sich bei dem Gebäude um ein Gebäude handelt, dessen Bewohner dort über einen langen Zeitraum verweilen.
  5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass es sich bei dem Gebäude um eine öffentliche Einrichtung mit Besucherverkehr handelt.
  6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass das vernetzbare Epoxidharz des Typs Bisphenol A durch Umsetzung von halogenierten Epoxiden mit Bisphenol A, mit Bisphenol AD oder mit Bisphenol F erhalten werden kann.
  7. Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass das vernetzbare Epoxidharz des Typs Bisphenol A eine Mischung aus Bisphenol-A-diglycidylether und Bisphenol-F-diglycidylether ist.
  8. Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass das Vernetzungsmittels modifizierten eine Mischung aus Polyamid und aliphatischem Polyamid ist.
  9. Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass das Gewichtsverhältnis des vernetzbaren Epoxidharzes des Typs Bisphenol A zum Vernetzungsmittel 0,1 bis 10, vorzugsweise 1 bis 2 beträgt.
  10. Verfahren nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass das vernetzbare Epoxidharz des Typs Bisphenol A in einer Dosis von 450 bis 950 g/m2 zum Einsatz kommt.
  11. Verfahren nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass es sich bei dem Rohbauelement um eine Betonplatte handelt, die mit einem Estrich überzogen ist.
EP07004830A 2006-03-13 2007-03-08 Verfahren zur Reduzierung des Radons im Inneren von Gebäuden Active EP1835510B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0602159A FR2898368B1 (fr) 2006-03-13 2006-03-13 Procede de reduction du radon a l'interieur des batiments.

Publications (2)

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EP1835510A1 EP1835510A1 (de) 2007-09-19
EP1835510B1 true EP1835510B1 (de) 2008-11-05

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US (1) US20070218832A1 (de)
EP (1) EP1835510B1 (de)
AT (1) ATE413683T1 (de)
AU (1) AU2007201083B2 (de)
DE (1) DE602007000220D1 (de)
ES (1) ES2314954T3 (de)
FR (1) FR2898368B1 (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109666375A (zh) * 2018-12-12 2019-04-23 沈阳工程学院 一种新型环保防氡涂料

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE639424A (de) *
US3619230A (en) * 1965-09-20 1971-11-09 Matthews Refractories Ltd Particulate coating method
GB2217631A (en) * 1988-03-31 1989-11-01 Westinghouse Electric Corp Method for attenuating gas diffusion through a structure
US5801194A (en) * 1989-09-01 1998-09-01 Battelle Memorial Institute Termite and boring insect ground barrier for the protection of wooden structures
CH683198A5 (de) * 1991-04-09 1994-01-31 Hesco Ag Verfahren zur Verringerung der Radonbelastung in geschlossenen Räumen.
DE4311810A1 (de) * 1993-04-05 1994-10-06 Horn Wolfgang Verfahren und Abdichtung zum Schutz von Bauwerken gegen Eindringen schädlicher Gase, insbesondere von Radon, aus dem Baugrund
US5399603A (en) * 1993-05-03 1995-03-21 Eastman Chemical Company Radon barrier film forming compositions
DE4410785A1 (de) * 1994-03-28 1995-10-05 Hoechst Ag Amin-modifizierte Epoxidharz-Zusammensetzung
DE19515670A1 (de) * 1995-04-28 1996-10-31 Bluecher Hasso Von Baufolie mit adsorbierenden Eigenschaften
DE19607423A1 (de) * 1996-02-28 1997-09-04 Hasso Von Bluecher Radon sperrende Tapete und Bodenbeläge
DE19645193A1 (de) * 1996-11-02 1998-05-07 Bluecher Gmbh Radon adsorbierende Bauteile
FR2799875B1 (fr) * 1999-10-15 2007-10-12 Jean Pronost Dispositif de suppression des gaz radioactifs ou nocifs dans les maisons, edifices...
JP3951685B2 (ja) * 2001-11-30 2007-08-01 株式会社日立製作所 中性子遮蔽材及び使用済み燃料収納容器
US20050129866A1 (en) * 2003-12-16 2005-06-16 Ko Chun-Shien Coating process of aluminium oxide on the surface of plastic floor tiles

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Publication number Publication date
ES2314954T3 (es) 2009-03-16
DE602007000220D1 (de) 2008-12-18
AU2007201083B2 (en) 2012-03-22
ATE413683T1 (de) 2008-11-15
FR2898368B1 (fr) 2008-04-18
FR2898368A1 (fr) 2007-09-14
AU2007201083A1 (en) 2007-09-27
US20070218832A1 (en) 2007-09-20
EP1835510A1 (de) 2007-09-19

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