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
  • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
  • C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
• • 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
  • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
  • C04B40/0028—Aspects relating to the mixing step of the mortar preparation
  • C04B40/0039—Premixtures of ingredients
  • C04B40/0042—Powdery mixtures
• • 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
  • C04B2111/27—Water resistance, i.e. waterproof or water-repellent 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

• the present invention is a process for producing a hydrophobized gypsum fiber board.
• Hydrophobised gypsum fiber boards are gypsum fiber boards with a reduced water absorption capacity.
• the mass increase of the plate must not exceed 5% by weight for a two-hour water storage at 23 °.
• Such panels are used, for example, in wet rooms such as bathrooms, ventilated facade systems and as facade panels.
• a variant for the production of hydrophobized gypsum fiber boards is to subsequently hydrophobize the gypsum fiber boards produced in the usual way. Since the plate core is not rendered hydrophobic in this variant, increased damage to the plate may result from damage to the plate surface and to the resulting sawing edges during processing.
• Another variant for the preparation is to mix in a powdered hydrophobing agent in the dry gypsum fiber mixture. Here, the homogeneous distribution of the hydrophobing agent is not guaranteed.
• the object of the present invention was to provide an alternative process for producing a hydrophobized gypsum fiber board.
• the object is achieved by a method for producing a hydrophobic gypsum fiber board in the dry or semi-dry process comprising the steps
• Stucco in the context of this application are forms of calcium sulfate hemihydrate, which correspond to the approximate formula CaS0 4 x Vi H 2 0, which bind with the addition of water to gypsum - calcium sulfate dihydrate -.
• Stucco plaster which has a particle size of 0.001 mm to 3 mm, has proved particularly suitable as stucco plaster.
• the proportion of stucco present in this particle size range is preferably at least 50% by weight of the stucco, more preferably at 70% by weight, even more preferably at 90% by weight.
• the particle size of at least 80% by weight of the stucco component is preferably ⁇ 2 mm or ⁇ 1 mm or ⁇ 100 ⁇ m. Corresponding particle sizes can be obtained in a simple manner from grading curves.
• the stucco is at least treated with a hydrophobicity ⁇ agent in liquid form according to the invention.
• the stucco is mixed with the hydrophobizing agent in a pre-mixer.
• the stucco is added together with the fibers in the main mixer with the hydrophobizing agent.
• stucco and fibers are first mixed together in a main mixer and the addition of the hydrophobizing agent then takes place in a post-mixer.
• the introduction of the hydrophobizing agent is preferably carried out by a Eindüsclar, ie the water repellent is pressurized by a or several nozzles of preferably 0.5 - 3.0 mm diameter pressed.
• the introduction can also be effected by spraying or the like.
• cellulose fibers and synthetic mineral fibers come into question.
• Suitable cellulose fibers can be obtained in a particularly simple manner from paper and cardboard storage.
• glassy fibers so-called textile glass fibers or wool
• synthetic mineral fibers such as synthetic mineral fibers.
• mineral fibers based on stone and / or glass wool are suitable.
• organic synthetic fibers In principle, organic synthetic fibers, natural fibers, metal fibers, etc. can be used.
• fibers sizes in the range of 0.001 mm to 2 mm are particularly suitable.
• at least 50% by weight of the fiber content is in this range, more preferably 70% by weight, even more preferably 90% by weight of the fiber content within the claimed limits.
• Preferred mixers used as pre-mixers, main mixers or post-mixers are continuous mixers. Parallel to the horizontal mixer shaft, the mix is mixed by mixing tools attached to the mixer shaft and then transported on.
• the mixer has a metering device, with which water and / or water repellents can be metered.
• the stucco - if necessary together with the fibers - before it comes on the moving screen belt, mixed with relatively small amounts of water. This is used in particular for the treatment of anhydrite III levels, which are found in stucco.
• the stucco is still “dry” after this treatment and does not stick.
• the water will chemically bound in this case.
• the introduction of the water is preferably carried out by injection.
• the introduction of the anhydrite water preferably takes place in the pre-mixer or post-mixer.
• the hydrophobizing agent is added together with the water used to treat the anhydrite III content.
• a preferred embodiment of the invention is a process in which an anhydride III treatment takes place in the premixer and at the same time a hydrophobing agent is introduced.
• the hydrophobing agent is introduced together with water for anhydrite III treatment in the post-mixer.
• the dry mixture of fibers and possibly treated stucco is then spread on a moving screen belt.
• moistening water On the screen belt moistening of the mixture of stucco and fibers with more water, which is referred to as moistening water. This is followed by pressing the moistened mixture to obtain a gypsum fiberboard strand.
• the liquid hydrophobing agent can be added to the stucco or the mixture of stucco and fibers without further additives. However, it is preferred that it be added to the water in the anhydride III treatment or the dampening water or, if appropriate, both.
• water repellents are added at least to the water for anhydrite treatment.
• the amounts of water added there are relatively small, it can surprisingly be achieved that the hydrophobizing agent is largely evenly distributed in the stucco and thus a continuous hydrophobization of the plate is achieved.
• amounts of from 0.1 to 0.3 parts by weight of fibers per part by weight of stucco have proven to be particularly suitable.
• quantities of 0.005 to 0.1 kg of water per kg of stucco have proven to be particularly suitable, more preferably in the range of 0.01 to 0.05.
• Water-repellent agents which have already been used for the treatment of gypsum plasterboard can in principle be used as water repellents.
• these are organic silicon compounds, in particular siliconates and polysiloxanes. Examples of these are the commercially available potassium methyl silicate solutions or Methyl hydrogen. Mixtures of water repellents are possible.
• Liquid means that it is a substance which, in contrast to a change in shape, presents a small resistance to a change in volume, but a great resistance to a change in volume. It is important that the water repellent is liquid in the temperature range. Typical applications for the application of the hydrophobing agent are between 10 and 40 ° C. Preferably, the use temperature is between 15 and 30 ° C.
• the viscosity of the liquid hydrophobing agent is preferably in the range from 0.5 to 2000 mPas at the use temperature.
• the amount of water repellents 0.002 to 0.015 kg per kg of the mixture of stucco and fibers have been found to be suitable, in this calculation, if necessary, the water contained in the water repellent, for example when using a suspension or emulsion, not included.
• gypsum fiberboard obtainable by the method according to the invention. It differs from gypsum fibreboards, where a surface impregnation takes place, in particular by the fact that the complete plate is hydrophobic.
• a gypsum fiber board meets the typification GF-H according to EN 15283-2.
• a finely divided stucco which has a mass passage of 85% on the 63 pm sieve.
• a continuous mixer with a device for water injection and metering of finely divided stucco to reduce the AIII content is conditioned, with water metered into the continuous mixer with 0.03 kg per kg stucco plaster.
• liquid methylhydrogenpolysiloxane in an amount of 0.01 kg per kg stucco plaster is added to the water for the anhydride treatment.
• Cellulosic fibers were recovered from waste paper and were processed so that 40% of the fibers were less than 90 pm.
• 100 kg of the finely divided, pretreated stucco were intimately mixed with 18 kg of cellulose fibers.
• the resulting dry gypsum-fiber mixture was sprinkled evenly on the moving screen belt.
• the moistening of the mixture with moistening water in a ratio of 1 to 0.8 was carried out on the sieve belt.
• the moistened plaster-fiber mixture was pressed to the desired plate thickness.
• the mixture was completely moistened and a large part of the excess water was expelled.
• the resulting continuous gypsum fiberboard strand was brought to the desired plate format by means of water cutting.
• the still moist gypsum fiber boards were transported to a multi-floor dryer and dried down to a residual moisture content of ⁇ 1%.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Ceramic Engineering (AREA)
• Materials Engineering (AREA)
• Structural Engineering (AREA)
• Organic Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Inorganic Chemistry (AREA)
• Producing Shaped Articles From Materials (AREA)
• Curing Cements, Concrete, And Artificial Stone (AREA)
• Paper (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

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Cited By (3)

Citations (7)

• 2014
  • 2014-06-26 NO NO14732888A patent/NO3013768T3/no unknown
  • 2014-06-26 DK DK14732888.4T patent/DK3013768T3/en active
  • 2014-06-26 WO PCT/EP2014/063506 patent/WO2014207098A1/de active Application Filing
  • 2014-06-26 EP EP14732888.4A patent/EP3013768B1/de active Active
  • 2014-06-26 AU AU2014301105A patent/AU2014301105B2/en active Active

Patent Citations (7)

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