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
  • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
  • C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
• • 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
  • C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
  • C04B26/02—Macromolecular compounds
• • 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
  • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
  • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
  • C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
  • C04B41/5022—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with vitreous 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
  • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
  • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
  • C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
  • C04B41/5025—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with ceramic materials
  • C04B41/5037—Clay, Kaolin
• • 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
  • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
  • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
  • C04B41/52—Multiple coating or impregnating multiple coating or impregnating with the same composition or with compositions only differing in the concentration of the constituents, is classified as single coating or impregnation
• • 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
  • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
  • C04B41/60—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only artificial stone
  • C04B41/61—Coating or impregnation
  • C04B41/65—Coating or impregnation with inorganic 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
  • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
  • C04B41/60—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only artificial stone
  • C04B41/61—Coating or impregnation
  • C04B41/65—Coating or impregnation with inorganic materials
  • C04B41/68—Silicic acid; Silicates
• • 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
  • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
  • C04B41/60—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only artificial stone
  • C04B41/61—Coating or impregnation
  • C04B41/70—Coating or impregnation for obtaining at least two superposed coatings having different compositions
• • 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

Definitions

• the invention relates to a method for producing insulating building boards and is based on a method in which a mineral fiber board prebound with an organic binder on a plastic basis is impregnated with an aqueous slurry of an inorganic binder and then warm-dried.
• Insulating plate should generally be understood to mean a heat and / or sound insulating plate which can also be used as a fire protection plate if necessary.
• Insulating building boards with the required high mechanical strength values can only be produced in the form of asbestos silicate boards, whereby asbestos fibers, hydraulic cements or calcium hydroxide with the addition of quartz powder or other silicate substances are first mixed with water to form a mash. This slurry is then dewatered and the filter cake thus obtained is pressed and hydrothermally hardened.
• the bending strengths of such plates are between 50 and 100 kp / cm 'at plate densities of 0.65 to 0.8 g / cm'.
• the compressive strengths are in the range from 30 to 70 kp / cm 2 .
• these plates also contain a considerable proportion of water-soluble, in some cases strongly alkaline, substances, so that the effect of moisture can lead to salt efflorescence on the surface of the plates.
• the prior art also includes a method for producing an insulating plate for wall and ceiling constructions with flame-retardant properties.
• a glass fiber layer pre-bonded with a plastic binder with a density of 0.11 g / cm 3 is first impregnated with an inorganic binder slurry consisting of hydraulic cements or gypsum, but preferably of magnesium oxide chloride cement (Sorel cement).
• Sorel cement magnesium oxide chloride cement
• the invention seeks to remedy this.
• the invention as characterized in the claims, solves the problem of specifying a method by which it is possible to exceed the compressive and flexural strength values of asbestos silicate boards without accepting the negative properties of the asbestos fiber boards bonded with cement to have to.
• a mineral fiber board bound with organic binders is deliberately used, the density of which is already selected to be as high as possible.
• this plate already has good dimensional stability during the impregnation and drying process activity receives.
• such a high degree of compaction of the starting fiberboard due to the favorable ratio of fiber content to binding clay, has a particularly advantageous effect on achieving the required strength properties of the end product, which not only has excellent compressive and flexural strength, but also an outstanding splitting strength.
• Another advantage results from the fact that the elastic modulus of this product is influenced favorably.
• These clays preferably consist mainly of the following minerals:
• the chemical composition of the clays fluctuates in the range of the following weight fractions:
• the thermal treatment provided according to the invention in the range between 400 ° C. and the transformation temperature of the mineral fibers used for the production of the prebound mineral fiber board achieves a complete water resistance of the insulating building board.
• the flammable organic constituents in the form of resins, lubricating oils, wetting and dispersing aids are removed by the temperature treatment medium in the manufacture of the mineral fiber base plate or impregnation process with the clay suspension have got into the plate, largely driven out again.
• the end product can not only no longer ignite, but also no longer glow and can therefore be regarded as an absolutely non-flammable material according to DIN 4102.
• the starting material for the mineral fiber board is one with a maximum fiber diameter of 6 nm.
• the clay suspension can be introduced more easily into the fiberboard, since the fiber cavities in the plate are relatively large and therefore, even when using coarse-grained clays when impregnating such a plate, there is no fear of a filter effect
• the final strengths achieved, in particular the splitting strength of a mineral fiber board produced in this way are considerably lower than in the case of a comparable board whose starting material consists of finer fibers.
• this unexpectedly high increase in strength can only be determined when temperatures below the transformation point of the mineral fibers used to produce the starting plates are used.
• this transition temperature was 620 to 640 ° C. If this temperature was exceeded, there was a significant deterioration in the panel strength, particularly with regard to flexural strength and elasticity behavior.
• This reduction in the strength properties is due to the fact that due to oxidation of the mineral fibers, during which a conversion of the FeO present in the fibers into Fe 2 0 3 takes place, the fibers become largely embrittled and thus the actual function of the fibers as a scaffold of the building board to give a high bending and tensile strength and elasticity is lost.
• the conversion of iron oxide under the influence of atmospheric oxygen is strongly temperature-dependent and proceeds particularly intensively when the transformation point is reached, at which the fiber softens.
• This undesirable oxidation reaction in the treatment of mineral fiber plates filled with binding clay in the temperature range mentioned can be in a further embodiment of the invention, this is practically completely eliminated if the temperature control and dwell time are further adjusted so that, on the one hand, the crystal water is almost completely eliminated from the binding clay and, on the other hand, the carbon, which is the residue from the combustion of the organic constituents in the Temperature treatment between 400 and 650 ° C forms, is not yet completely burned out.
• This phenomenon can be further improved by the fact that the temperature treatment in this temperature range takes place in a reducing atmosphere, that is to say by appropriately setting the flame in the case of furnaces operated with gas or heating oil, or by installing a vessel with powdered graphite or graphite rods in the furnace chamber when using electrically heated ovens.
• the impregnated plate can be subjected locally to another impregnation before drying, this additional impregnation advantageously being carried out at the edges of the plate.
• this additional impregnation advantageously being carried out at the edges of the plate.
• reinforced areas are obtained which are used for picking up nailing, milling grooves and working out springs or tines and the like, can serve. In this way, you can make shapes in particular at the edges, which allow the direct connection of one plate with the subsequent plate and a complete seal of any gaps and also the Increase the strength of such a composite panel.
• drying can be carried out by microwave radiation. This avoids a drying gradient from the outside in, which inevitably occurs, for example, when drying with warm air. Rather, drying is achieved from the inside out and thus a uniform structure of the finished plate.
• the moist fibrous web was then pressed in a plate machine between two perforated metal strips to a thickness of 25 mm to form a plate and at the same time dried and cured with hot air at 200 to 220 ° C.
• the plate thus produced had a density of 0.2 g / cm 3 .
• the resin content was 3.6% by weight of solid, based on the weight of the plate.
• the strand of plates thus produced was passed into a flooding device, where an aqueous suspension of binding clay was sucked into the mineral fiber plates from above with the aid of a vacuum applied to the underside of the plates, until the plate was completely saturated.
• the impregnated plate was then passed on a conveyor belt into a drying oven and dried there with circulating air at 200 ° C. It was then heated for 10 minutes at 580 ° C. or 20 minutes at 480 ° C. in an oven heated with natural gas with a reducing flame.
• the plate saturated with binding clay suspension was passed between two pressure rollers, the excess of the clay suspension being almost completely pressed out of the plate.
• the binding clay suspension used was prepared in a turbo mixer by slurrying a powdery or lumpy binding clay of type FC from Didier from Gruenstadt in water.
• the viscosity of the suspension was adjusted to 6 to 12 cP by adding sodium polyphosphate salts as liquefying agents.
• Table 1 shows a compilation of different process procedures and the achievable or achieved values, whereby a detailed description of this table is not necessary because of the detailed information of the process steps and the corresponding values.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Ceramic Engineering (AREA)
• Materials Engineering (AREA)
• Structural Engineering (AREA)
• Organic Chemistry (AREA)
• Inorganic Chemistry (AREA)
• Paper (AREA)

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Citations (5)

• 1977
  • 1977-07-18 DE DE2732387A patent/DE2732387C2/de not_active Expired
• 1978
  • 1978-07-17 DE DE7878100410T patent/DE2860819D1/de not_active Expired
  • 1978-07-17 EP EP78100410A patent/EP0000402B1/fr not_active Expired

Patent Citations (5)

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