EP1851181A1 - Matiere moulable constituee de particules recouvertes d'une matiere de revetement et son utilisation pour la production de corps moules - Google Patents

Matiere moulable constituee de particules recouvertes d'une matiere de revetement et son utilisation pour la production de corps moules

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Publication number
EP1851181A1
EP1851181A1 EP05818161A EP05818161A EP1851181A1 EP 1851181 A1 EP1851181 A1 EP 1851181A1 EP 05818161 A EP05818161 A EP 05818161A EP 05818161 A EP05818161 A EP 05818161A EP 1851181 A1 EP1851181 A1 EP 1851181A1
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EP
European Patent Office
Prior art keywords
particles
composition according
inorganic
foamed
organic
Prior art date
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Application number
EP05818161A
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German (de)
English (en)
Inventor
Gerhard Melcher
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Individual
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Individual
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Publication date
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Publication of EP1851181A1 publication Critical patent/EP1851181A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/02—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding chemical blowing agents
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00482—Coating or impregnation materials
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00663—Uses not provided for elsewhere in C04B2111/00 as filling material for cavities or the like
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/52—Sound-insulating materials
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Definitions

  • Molding composition consisting of coated with coating particles and their use for the production of moldings
  • the invention relates to the field of molding compositions and molding production based on the binding of particles by coating compositions.
  • Coating compositions such as, for example, cement paste, are used for point-wise cementing, in particular of coarse-grained particles, such as gravel or expanded clay particles, e.g. in porous concrete with maximum retention of void volume between the particles.
  • coarse-grained particles such as gravel or expanded clay particles
  • the aim of the use of these coating compositions is usually to produce cost-effective moldings with low specific weight and better insulation behavior.
  • foam compositions are used and if these are added, for example, to coarse-grained particles, then these compositions have all the negative properties of foam compounds. They are difficult to fill in molds without air pockets and also do not have the strength properties of the framework of mutually supporting, coarse-grained, such as pressure-stable particles, such as those present in porous concrete.
  • foam is allowed to form in a mold, it is necessary to provide an excess of foam in order to guarantee complete filling of the mold. This thus requires either pressure-resistant forms or shapes with foam outlet openings, which often leads to contamination and as a result to necessary cleaning processes.
  • inorganic particles such as gravel, pumice, expanded clay, expanded mica, expanded glass, pearlite, etc.
  • organic particles such as polystyrene particles
  • cement and various other materials such as water glass, glue, etc. and used mainly for screeds and plasters (DE 296 23 459 Ul).
  • AT 407526 B for example, in AT 407526 B a very thin coating of particles with clay mineral-containing earths, such as clay, loam, marl, but also cement, lime, gypsum or the like is proposed in order to achieve the lowest possible densities for good insulating properties of screeds.
  • clay mineral-containing earths such as clay, loam, marl, but also cement, lime, gypsum or the like.
  • DE 197 14729 Al the sheathing of fiber materials is described.
  • Organic binders, such as bitumen, are used as binders for foam granules for underbody masses (EP 0 947 480 B).
  • Coating compositions are also used in the pellet production of inorganic building materials.
  • light particles such as perlite or distended vermiculite, either in a melting process with solid shells (JP 7291685 A) or in the case of the use of glass with a foamed crust (JP 61236643 A) are coated.
  • the use of a mixture of phenolic resin and rock flour as a coating composition is described in JP 56160368 A.
  • the object of the invention is, using a coating composition for organic and inorganic particles, in particular coarse particles, to describe a method for the production of moldings in which particles are combined with foam compositions, wherein
  • the foam mass fills the void volume between the particles either completely or at least partially to an adjustable extent
  • the object of this invention can be met by means of special coating compositions.
  • the filling of the void volume between the particles, in particular coarse particles by foam masses is important not only for the strength of the bonding of the particles, but also for the insulation and fire protection properties.
  • the heat transfer is based on heat conduction through the material framework, on convection through the air in the material scaffold and on radiation.
  • the filling of continuous cavities, in particular between coarse-grained particles with a cured foam mass hinders convection and radiant heat conduction and thus improves the insulation and fire protection properties of the molding.
  • coating compositions have been developed for particles, in particular for coarse-particle particles, which are produced from one or more components and which adhere to the particles in the process of filling the particles coated with the coating composition into a mold, into a cavity or their application to a surface without ripping off even with relatively large layer thicknesses and process-related vibration.
  • This process will hereinafter be referred to as a molding process.
  • the coating composition either begins to foam after this shaping process or is made to foam or it has begun to foam and crosslink at high reactivity already during the mixing process and the molding process. In the latter case, the viscosity of the coating composition already increases during the mixing and shaping process compared to the originally used in the individual components viscosity.
  • the foaming mass thus fills the void volume between the particles.
  • a movement of the particle skeleton by the resulting foam is partly due to the weight of the particles and on the other hand by their mutual tension and support, which can be enhanced, for example, by a vibration process or a pressing process, prevented.
  • Even if the coating composition has already begun to foam before or during the molding process this is compared to the void volume slight still uncured foam volume fraction by the weight of the particles and their mutual tension (the pressure applied to the coating composition, which is between the direct contact surfaces of the Particle is, corresponds) pressed into the void volume between the particles and foams and hardens there further.
  • the amount of the coating composition to be used is calculated firstly from the void volume between the particles, secondly from the desired foam density to be set and thirdly from the fill level of the void volume to be set.
  • a space filling (Vj ⁇ u ge i / V Gesa m t ) of 0.74 results purely geometrically in the unit cell - and thus independent of the particle size - and thus a void volume of 26% by volume. If particle size mixtures or strongly irregular particle shapes or fines are used, the void volume must be determined experimentally.
  • the void volume can be calculated from the weight increase of the sample filled with bauxite flour.
  • Foam density, curing and foaming rates can be adjusted for the selected binder according to the prior art by selecting the amount and type of foaming agent and curing agent and the reaction conditions.
  • the flow behavior of the coating composition is important. It is intended, on the one hand, to ensure as light and uniform a distribution of the mass on the surface of the particles as possible during the mixing process and, on the other hand, to guarantee a stable adhesion of the coating mass to the particle surface during the shaping process of the coated particles.
  • the coating composition is thus adjusted to whether a vibration process takes place and how strong and long it must be carried out and in which layer thickness the coating composition is applied to the particles.
  • the layer thickness results from the amount of the coating composition and the specific surface area of the particles.
  • the amount of Coating mass is calculated from the void volume, the foam density to be set and the fill level of the void volume to be set.
  • the initial viscosity shall already be high enough, with a value of at least 100 mPa.s to 500 mPa.s, or more of 500 mPa.s to 5000 mPa.s , or preferably from 5000 mPa.s to 50 000 mPa.s is favorable.
  • the coating composition has the properties of a non-Newtonian liquid, it is preferable to adjust thixotropic (see Example 1), in particular selecting pseudoplastic compositions which have a high apparent viscosity at rest, which decreases with increasing shear rate and increasing stirring time.
  • the reactivity of the coating composition ie its hardening and foaming behavior, can be adjusted so that it already has high viscosity in the molding process due to the incipient crosslinking of the coating composition and / or an incipient foaming process.
  • Example 2 based on the procedure described in AT 400840 B, in which the composition is additionally thixotropic.
  • Supporting this process is that foams themselves have thixotropic properties, which contributes to the rigidity of the foaming coating composition itself.
  • the necessary rheological behavior, ie the sag resistance of the coating composition is thus determined quite substantially by the layer thickness on the filler.
  • a low viscosity is possible because the coating composition is present in very thin layers and does not sink even with strong shaking, while for coarse-grained particles with smooth closed surfaces (eg gravel) the stability of the coating mass layer is essential.
  • a determination of the flow path can be made in accordance with DIN 16916 Part 2.
  • the use of a Brookfield viscometer in accordance with ASTM D 2196 or an assessment of the flow inclination using a level and professionprüfrakels (Erichsen (Germany)) according to DIN 55677 or ASTM D 4400 are further methods. It is, for example, according to DIN 55677 according to point 7.2 relatively easy to set with the aid of finely ground, inexpensive platelet-shaped fillers in coating thicknesses solid layer thicknesses of 1 000 microns to 1 300 microns and above.
  • the coating compositions can be adjusted by their rheological properties (viscosity and in particular thixotropy) and their reactivity to the corresponding process conditions for a person skilled in the art.
  • both inorganic and organic particles or mixtures thereof preferably with a particle size of 1 mm to 24 mm, to 50 mm or a maximum of 100 mm, in particular the industrially available particle size ranges, such as those between 4 mm and 12 mm, or preferably of 2 mm to 4 mm, 4 mm to 8 mm, 8 mm to 12 mm, 8 mm to 16 mm or 12 mm to 20 mm, or mixtures thereof or any other particle size ranges or selected in these areas Einkornzusammen deren be used.
  • inorganic coarse-grained particles for example, particles with compact surfaces, such as glass beads, corundum hollow spheres, gravel, various rock particles, such as gypsum, etc.
  • foamed or porous particles such as expanded clay, expanded glass, expanded, Perlite, expanded mica, distended vermiculite, volcanic rock particles, tuff, pumice, etc. or high-temperature-resistant particles of, for example, corundum, chamotte, molochite, etc.
  • Organic particles may be, for example, cork particles, wood chips, foam particles, particles from various recycling materials, polystyrene particles, etc., ie consist of substances that contribute to Group of organic polymers belong.
  • organic or inorganic microspheres or nanospheres are suitable, such as, for example, polystyrene, PMMA or aluminum oxide, glass or quartz.
  • Microspheres of diameter 0.2 to 0.6 mm, for example of hafnium oxide and zirconium oxide, can also be used for high-temperature applications, for example.
  • Absorbency, porosity and specific surface area of the particles are essential for the adjustment of the coating composition. For example, if you use materials such as expanded clay, slate, or distended vermiculite so specifically the absorbency of the material (in particular the material moisture) and the specific surface to be considered.
  • the coating compositions which may be predominantly inorganic or predominantly organic in nature, consist of: a) a binder.
  • the binders can be both organic, such as polyesters, polyurethane, acrylates, epoxy resins, bituminous materials, etc., as well as inorganic, such as phosphate-based, such as solutions of predominantly primary phosphates of magnesium, calcium, aluminum, preferably A, aluminum monophosphate, such Water glass base, such as solutions of sodium or potassium silicates of various concentrations, cement-based, such as calcium silicate (Portland cement) or Calziumaluminatbasis, or gypsum-based, Sorrelzementbasis, etc. or chemically possible mixtures thereof.
  • phosphate-based such as solutions of predominantly primary phosphates of magnesium, calcium, aluminum, preferably A, aluminum monophosphate, such Water glass base, such as solutions of sodium or potassium silicates of various concentrations
  • cement-based such as calcium silicate (Portland cement) or Calziumaluminatbasis, or gypsum-based, Sorrelzementbasis, etc. or chemically possible mixtures
  • a hardening substance wherein the curing takes place after the foaming process or simultaneously with this;
  • hardening and foaming substance may be identical.
  • organic binders in question for example, isocyanates, peroxides, epoxides, etc. in question
  • inorganic binders substances are used, such as for aluminum monophosphate soluble polyvalent metal oxides, and their carbonates, for water glass in particular acid-splitting hydrolyzing substances or reactive metal oxides , for cement and gypsum water acts as a hardening substance, in sorrel cement magnesium oxide is hardened by magnesium salts, such as their chloride or sulfate.
  • These may be, for example, ammonium carbonates or alkali metal carbonates, polyvalent metal carbonates, water in the case of polyisocyanates, aluminum powder, organic or inorganic peroxides, sodium perborate, hydrogen peroxide, etc. d) optionally inorganic ground fillers, such as kaolin, chalk, slate, mica, quartz, etc. and / or optionally also fine to coarse-grained hydrates, such as gypsum, gypsum, magnesium sulfate hydrate, Aluminiumumsulfathy-, alums, etc. or organic fillers, such as starch, sugar, etc. included. Preference is given to particles with anisotropic form, ie with platelet or needle-shaped structures.
  • thixotropic suspensions Another advantage of platelet fillers is that they stabilize the wall structure of the foam bubbles.
  • flame retardants such as hydrates of salts, for example sulfates, such as gypsum, Epsom salt, various phosphates, such as MgHP ⁇ 4 .3H 2 ⁇ , MgHPO ⁇ VBbO, or pyrophosphates or hydroxides of aluminum, magnesium, calcium, etc.
  • fillers such as inorganic or organic fibers, for example glass fibers, wood fibers, pulp fibers, plastic fibers, or rod-shaped fillers, such as wollastonite.
  • optionally thixotropic substances such as hydrophilic or hydrophobic colloidal or fumed silica, synthetic polymers having ionic and / or other associating groups, such as homopolymers and copolymers of acrylic acid, their alkali and ammonium salts, smectites, organically modified bentonites, Montmorillonites, carboxymethylcellulose and water-soluble melamine-formaldehyde resins or urea derivative resins, gelatin, hydroxypropylmethylcellulose, ethylene oxides and propylene oxide copolymers, etc., h) optionally various additives, such as wetting agents, flow aids, retarders (retarders for cement, etc) i) and optionally water-binding substances, in particular when using aqueous binders such as calcium sulfate, magnesium sulfate, aluminum sulfate, various phosphates or pyrophosphates of alkali metals, magnesium and calcium which form hydrates (as
  • the process consists essentially of three stages:
  • the coating composition can either be prepared in advance in a separate vessel and be applied as such in a mixer to the particles, or alternatively it is applied to the particles by stepwise application of the individual components to the particle surface. surfaces produced in the mixer.
  • slow or fast-running mixers can be used in continuous or discontinuous mixing processes. In general, it is sufficient if the coating composition covers the surface of the particles almost completely or at least partially. In practice, there are hardly any completely round particles with uniform outer surfaces. Since the coating composition in the mixing process is primarily distributed only on the mutual contact surfaces of the particles, in some cases sub-surfaces of the particles remain uncoated. However, this is irrelevant to the overall process. It is essential that a virtually homogeneous distribution of the coating composition takes place during the foaming and curing process in the molding.
  • the stepwise application of the coating composition is recommended with a high reactivity of the coating composition, wherein only in the last step, shortly before the shaping process, the reactive hardener and foaming component is applied to the particles.
  • the setting and foaming process already begins during the mixing and shaping process, the reactivity of the mixture, ie holding time, rise time, setting time, compression time, being tuned to the overall process, as described, for example, in patent AT 400 840 B is described.
  • This is particularly favorable for the timing of a production process, since it keeps stand times and curing times as short as possible.
  • the overall foaming process must be calculated so that the mechanical breakdown of the foam during the mixing process by the particles proceeds as a precrosslinking process of the coating composition, in which the binder is partially crosslinked to larger molecular units, and by the remaining unreacted hardener / foamer quantity to the desired degree of filling of the void volume between the particles comes. This procedure requires exact adherence to well-defined mixing times (See Example 2).
  • oxides such as cements (tricalcium silicate, calcium aluminates, etc.), CaO, etc.
  • Sulphates such as the sulphates of calcium, aluminum, and the vitriol-forming sulphates of copper, manganese, magnesium, zinc, iron, cobalt and nickel, or double salts of these sulphates with potassium or ammonium sulphate or alum
  • the foaming masses produced on the basis of phosphate are characterized in that the inorganic foam product which is produced by the mixing together of two or more components, of which at least one is liquid and acidic and water, phosphates or phosphoric acid as a binder and at least one second component containing polyvalent cations in an acid-reactive form, characterized in that it contains a water-binding substance in a substantial amount for binding the water contained in the foam mass ,
  • drying rate must be matched to the curing and foaming behavior of the coating composition. Drying may therefore only take place after foaming and hardening.
  • compositions which subsequently contain water of hydration in bound form, are particularly suitable for use in closed molds or composites, such as fire doors or panels with metallic outer layers, since the chemically bound water, unlike the physically bound, in the long term to the fire protection property the hardened mass contributes. It is also advisable to add such hydrates as fillers to the coating compositions and thus to adjust any fire resistance classes via the chemically bound water content.
  • the dosage of the coating composition takes place in such a way that the void volume between the fillers is filled either substantially completely (to a maximum of 100%) in order to avoid possible coating mass leakage (lathering) from the mold or cavity in the course of curing and foaming, or at a lower adjusted percentage such as 10%, 20%, 50%, 75% or 90% of the void volume.
  • a foam amount which is greater than that required for the filling of the entire void volume is also possible.
  • the mold is to be filled with the coated particles and it must be provided for the resulting, the void volume exceeding foam amount, foam outlet openings in the mold or pressure-resistant forms are used. It is thus possible to adapt the properties of the molded article produced in a wide range to the requirements in terms of strength, elasticity, thermal insulation, fire protection, etc. Naturally, the selection of raw materials is essential for the properties of the final product.
  • the molding process of the coating composition coated particles by filling into a mold, into a cavity, or by applying to a surface can be done rapidly within seconds or slowly within minutes.
  • a densification process for example by vibration or by a pressing process, can be used to achieve a uniform dense arrangement of the particles, for example in the cubic closest packing.
  • the coating composition After the forming process of the coated particles, the coating composition is at rest. It can now be brought to a predetermined extent for foaming and either at the same time or shortly thereafter for curing.
  • the foaming and curing process can either take place automatically at room temperature, usually under exothermic conditions or can be started and carried out by heating, for example, with thermal energy with heating devices or with microwave or high-frequency energy.
  • the porous structure of the hardened and foamed mass present here permits accelerated drying in the form of a separate process stage by sucking air through the shaped body, in particular with heating of the shaped body.
  • This method of sucking air is particularly advantageous in closed by outer surfaces moldings, such as fire doors, as this their uniform flow can be achieved. In this case, this is nothing more than a simulation of slowly changing air by a change of temperature (day / night) in a physically bonded moisture-containing fire door from which when heated with water vapor saturated air is transported through the air expansion to the outside and cooling from the outside unsaturated fresh air is sucked in.
  • significant quantities of physically bound water can be transported outwards over the course of years.
  • a filled with the cured and foamed mass mold, a filled cavity or a demolded body which has homogeneous properties even at large dimensions and filling heights and consists of particles and foam masses that at least partially fill the void volume between the particles.
  • the main application areas include the Areas of thermal insulation and sound insulation as insulating material and the areas of fire protection and high-temperature applications.
  • the mass for filling cavities there are a variety of applications of the mass for filling cavities.
  • the coated with coating mass particles can be blown into a cavity, where they are then connected by the foam to a long-term stable vibration insensitive molding. It is advantageous, for example, if the particles in this use are already coated with a part of the coating composition, are transported as such to a construction site and, on the spot, quantity-related subcomponents for curing and foaming are admixed continuously or discontinuously. In analogous form, such compositions can be used, for example, for screeds.
  • moldings in the construction industry may take the form of insulation or fire protection panels and any other molded parts or part of composite elements.
  • Such composite elements can by connecting to other components of mineral materials, such as element in precast chimneys, as insulation in prefabricated house walls and ceiling elements, or in combination with other example thin-walled, such as metallic outer layers, such as in fire doors, panels, door frames, and the like be formed.
  • the moldings remain parts of the composite element.
  • it is to be regarded as a considerable advantage that you can produce from silos and, for example, for fire doors no plate storage and no plate blanks needed.
  • Such materials can be used for example as insulation in household appliances, such as refrigerators, dishwashers or insulation in ovens and heating systems for industry, commerce and household.
  • high-temperature-resistant particles such as corundum hollow spheres
  • high-temperature-resistant binders for example based on aluminum phosphate such materials and moldings for the high temperature range from 600 0 C to 2200 0 C, preferably in the range of 900 0 C to 1450 0 C and from 1450 0 C to 1750 0 C, can be used.
  • Spezialan- Punctures result from the use of organic or inorganic microspheres or nanospheres. They can be bound together by coating compositions to hardened masses with defined cavities, which can be used for example as a filter or carrier material.
  • packaging materials for example on a purely organic basis, can thus be produced inexpensively.
  • the invention thus relates to the particles coated with the coating composition, the method of foaming, curing and shaping, furthermore the cured and foamed composition, for example a shaped body which is obtainable by the curing of the composition according to the invention, and an article or component, in particular composite elements with, for example, metallic outer layers, such as panels, metal doors, fire doors, etc., which contain a filling of the moldings obtainable with the composition according to the invention.
  • Coating composition The cement slurry used as the coating composition was adjusted to a layer thickness of more than 1 300 ⁇ m with highly dispersed silica HDK N 20 (Wacker-Chemie GmbH, Germany) with respect to its drainage tendency according to DIN 55677 according to 7.2.
  • SB3 Heidelberger Zementwerke
  • the foamer used was standard aluminum powder Slurry N30 No. 53199 / G from Eckart GmbH & Co. KG, (Germany).
  • the following coating mass components are added in steps 1 to 3 with mixing times of 10 seconds and a mixing tool speed of 50 rpm.
  • Hardener / foaming mixture consisting of 147 g of magnesium oxide and 100 g Omyacarb 15 (Omya, Germany). The addition of the hardener / foaming ergemisches takes place with a mixing time of 5 seconds and a speed of the mixing tool of 100 rev / min.
  • the coarse-grained expanded clay particles coated with the coating composition are filled into a sheet-metal mold under vibration for 10 seconds.
  • the foamed and cured clay based on expanded clay has a density of 0.61 g / cm 3 .
  • the alternative example with expanded glass particles gave a density of 0.356 g / cm 3 .
  • Particles As particles, expanded clay particles with a bulk density of 320 kg / m 3 and an experimentally determined void volume of 51 volume percent are used. Due to the absorbency of the expanded clay, it is recommended to set a defined material moisture content by adding 10% water by weight. [Alternatively: non-absorbent expanded glass particles with a bulk density of 140 kg / m 3 and an experimentally determined void volume of 45% by volume.]
  • Coating composition This example describes the preparation of a hardened and foamed composition suitable for fire protection and follows the stoichiometric theory of almost complete neutralization of the secondary hydrogen atoms of the phosphoric acid groups described in AT 400 840 B / EP 0741 677.
  • the method of internal water binding by anhydrous magnesium sulfate is described in patent AT 408 347 B.
  • the amount of bound water (water of hydration) can be widely controlled by the addition of other hydrated fillers (e.g., gypsum, epsom salt) and contributes significantly to the fire protection properties.
  • the addition of various additives, e.g. Wetting agent occasionally recommended.
  • the process parameters are particularly important because of the reactivity of the coating composition.
  • Example of coarse particles with high specific surface area expanded vermiculite.
  • the coating composition is applied. Foaming and hardening are started by microwave heating.
  • Particles are blown vermiculite (from KramerProgetha GmbH) with a particle size of 3 mm to 15 mm, a bulk density of 100 g / liter and an experimentally determined void volume of about 60% by volume.
  • Coating composition used is a 50% strength by weight sodium waterglass solution (Henkel) (viscosity: 500-830 mPa.s), in which finely ground sodium perborate and the waterglass hardener Fabutit 277 (Chemische Fabrik Budenheim, Germany) are mixed.
  • 3 g of polystyrene particles are mixed with a mixture of 3 g of component 1 (polyester) and 4.2 g of component 2 (isocyanate) for 30 seconds and cured under slight pressure.
  • the polystyrene beads have a size of 3 mm to 5 mm, a bulk volume of 100 cm 3 / g and a void volume of 72 volume percent.
  • the volume of the shaped body is essentially given by the bulk volume of the polystyrene particles.
  • the void volume is about 2/3 full.
  • the density of the shaped body is 0.04 g / cm 3 .

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

L'invention concerne une matière expansible, durcissable et moulable qui est constituée de particules recouvertes d'une matière de revêtement. Dans le corps moulé produit avec cette matière, les particules sont mécaniquement en contact les unes avec les autres et le volume vide entre les particules est rempli de mousse dans une mesure réglable. Cela permet d'associer les propriétés mécaniques et isolantes de la structure particulaire aux propriétés mécaniques et isolantes de la matière mousse durcie. La matière expansée et durcie convient notamment aux applications comme matériau isolant, matériau ignifuge et aux applications à haute température.
EP05818161A 2004-12-29 2005-12-20 Matiere moulable constituee de particules recouvertes d'une matiere de revetement et son utilisation pour la production de corps moules Withdrawn EP1851181A1 (fr)

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Application Number Priority Date Filing Date Title
ATA2185/2004A AT501586B1 (de) 2004-12-29 2004-12-29 Formmasse bestehend aus mit überzugsmasse überzogenen partikeln und deren verwendung zur herstellung von formkörpern
PCT/AT2005/000511 WO2006069411A1 (fr) 2004-12-29 2005-12-20 Matiere moulable constituee de particules recouvertes d'une matiere de revetement et son utilisation pour la production de corps moules

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EP1851181A1 true EP1851181A1 (fr) 2007-11-07

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WO2006069411A1 (fr) 2006-07-06
AT501586A1 (de) 2006-09-15

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