EP1999084A1 - Produit de plâtre - Google Patents

Produit de plâtre

Info

Publication number
EP1999084A1
EP1999084A1 EP07727407A EP07727407A EP1999084A1 EP 1999084 A1 EP1999084 A1 EP 1999084A1 EP 07727407 A EP07727407 A EP 07727407A EP 07727407 A EP07727407 A EP 07727407A EP 1999084 A1 EP1999084 A1 EP 1999084A1
Authority
EP
European Patent Office
Prior art keywords
gypsum
salts
silicates
plasterboard
borates
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07727407A
Other languages
German (de)
English (en)
Inventor
Hans-Ulrich Hummel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Knauf Gips KG
Original Assignee
Knauf Gips KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Knauf Gips KG filed Critical Knauf Gips KG
Priority to EP07727407A priority Critical patent/EP1999084A1/fr
Publication of EP1999084A1 publication Critical patent/EP1999084A1/fr
Withdrawn legal-status Critical Current

Links

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
    • 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
    • C04B2111/00612—Uses not provided for elsewhere in C04B2111/00 as one or more layers of a layered structure
    • C04B2111/0062—Gypsum-paper board like materials

Definitions

  • the present invention relates to gypsum products having improved properties, in particular gypsum boards.
  • Gypsum products such as gypsum plaster boards, gypsum fibreboards, cleaning materials are widely used in construction. These materials contain gypsum (calcium sulfate dihydrate) as a main ingredient.
  • the gypsum is formed by a dissolution and recrystallization effect, whereby the resulting gypsum crystal needles become matted and penetrate one another and thus form a firm structure. Residual water trapped in the crystal structure dries over time or is removed from the gypsum body in suitable driers in a short time. This leads to the buildup of mechanical stresses in the resulting gypsum product. Later relaxation (relaxation) can lead to crack formation in building structures or more or less pronounced deformations.
  • gypsum fiberboards which, in addition to calcium sulphate dihydrate, contain between 5 and 25% CeI lu lose fibers as the main constituent.
  • Gypsum fiber boards are made in a similar way to plasterboard. After complete setting on setting lines, the board strand is divided into individual plates by sawing or a paper cut, and the remaining excess water in the plate is expelled in thermally heated dryers. Gypsum fiber boards are described for example in US 5,320,677.
  • Fillers used for laying and grouting such boards also contain gypsum as their main constituent. Such materials are described, for example, in US Pat. No. 3,297,601.
  • All of these products are made by mixing burned gypsum with water and, if necessary, excipients, bringing it into the desired shape and allowing the mixture to harden. This forms a matrix of calcium sulfate dihydrate crystals which gives the product stability.
  • the shape and dimension of the gypsum crystals essentially determines the stability. It often follows a heating step to remove excess free water from the product, for example in plate dryers about 100 to 130 0 C, when no free water is contained.
  • WO 99/08979 describes cured gypsum products having improved resistance to deformation using condensed phosphoric acids or their salts as additives. A similar procedure is described in WO 00/06518.
  • WO 2004/052802 describes a method in which tartaric acid or its salts are added to the gypsum slurry. This should be obtained plates that show a reduced creep.
  • the object of the present invention was to develop a process with which improved properties of gypsum-bound construction products are obtained, in particular in the area of hydration intensity, hydration expansion and drying shrinkage.
  • the object is achieved by a method for producing a gypsum board with improved properties, comprising the following steps: a) mixing
  • Setting calcium sulfate phases are those materials which, when mixed with water, are capable of forming calcium sulfate dihydrate.
  • Suitable starting materials are, in particular, calcium sulfate hemihydrate (stucco) and anhydrite or screed plaster or combinations of both.
  • further processing auxiliaries such as flow agents, surfactants (foaming agents), water repellents, starch, products for improving water retention, etc., may be present.
  • the metal silicates which can be used as crystal modifiers follow the general formula SiO 2 : Me 2 O.
  • Such metal silicates are obtainable, for example, by the melting together of pure quartz sand and metal carbonates. In this way, compounds of the general formulas Me 4 SiO 4 , Me 2 Si 2 O 5 , Me 2 SiO 3 , Me 2 Si 4 O 9 , or mixtures thereof can be represented.
  • Me are monovalent metals such as alkali metals.
  • metal silicates are alkali metal silicates. Of these, in turn, sodium and potassium silicates or mixtures thereof are preferred. Sodium and potassium silicates of the composition Me 2 O x nSiO 2 are referred to as water glasses because of their water solubility. These are particularly preferred.
  • the ratio between SiO 2 and Me 2 O is preferably in a range from 1.0 to 4.0, ie typically the proportion of SiO 2 predominates.
  • condensed silicates in which several silicate units are connected to one another, in particular ring-shaped condensed silicates (metasilicates).
  • Suitable proportions of metal silicates are based on the settable calcium sulfate phases in the concentration range of 0.001 to 0.3 wt .-%. Preferred ranges are greater than 0.01 weight percent, more preferably greater than 0.05 weight percent or greater. Preferably, the content is in a range below 0.2 wt .-%, more preferably below 0.1 wt .-%.
  • divalent heavy metal salts in particular transition metal salts.
  • Preferred heavy metals are copper, zinc, iron, tin and mixtures thereof. Salts of these transition metals which are soluble in the aqueous phase, for example sulfates, chlorides, hydroxides or oxides, are particularly suitable as crystal modifiers. Particularly preferred substances are copper sulfate and zinc sulfate or their hydrates.
  • Suitable proportions of transition metal salts are in the concentration range from 0.001 to 0.3% by weight, based on the content of settable calcium sulfate phases. Preferred ranges are between 0. 01% by weight and 0.1% by weight, preferred ranges are more than 0.01% by weight, more preferably more than 0.05% by weight. Preferably, the content is in a range below 0.2 wt .-%, more preferably below 0.1 wt .-%.
  • borates are typically hydrated, but anhydrous compounds can also be used.
  • the borates are preferably used as alkali metal or alkaline earth metal salts.
  • Particularly preferred metaborates are used which are formed by dehydration of orthoboric acid (B (OH) 3 ) by dehydration. These form closed rings or open chains.
  • Particularly preferred compounds are those of the general formula Me 2 B 4 O 7 , MeB 5 O 8 , Me 2 Bi 0 Oi 6 , Me 2 B 8 Oi 3 , wherein Me is an alkali metal.
  • Borax Na is preferably 2 B 4 O 7 x 10 H 2 O.
  • Other examples include NaB 5 O 8 x 4 H 2 O and KB 5 O 8 x 4H 2 O.
  • Preferred contents are between 0.001 and 0.3% by weight, based on the content of settable calcium sulfate phases. Preferred ranges are more than 0.01% by weight, more preferably more than 0.05% by weight. Preferably, the content is in a range below 0.2 wt .-%, more preferably below 0.1 wt .-%.
  • gypsum-containing products obtainable by the method according to the invention.
  • these are plasterboard, gypsum fiber boards.
  • gypsum-containing products are as well Plasters, fillers for laying and grouting gypsum boards or floor screeds on a gypsum basis are conceivable.
  • crystal modifiers for example the divalent heavy metal salts with metal silicates, the divalent heavy metal salts with borates or the metal silicates with borates.
  • the use of all three crystal modifiers is possible.
  • the invention is further illustrated by the following example.
  • FIG. 1a shows the hydration expansion of the corresponding mixtures. The determination is made by the following measuring method:
  • the gypsum slurry is placed in measuring cells (33 ⁇ 40 ⁇ 2 cm) for 30 minutes.
  • a thermocouple is positioned in the middle of the specimen to record the rehydration temperature.
  • Figure Ib shows the comparison of the hydration expansion of the following products:
  • the setting expansion reaches a plateau after a short time, whereby the absolute expansion can be controlled by the choice of the crystal modifier.
  • Figure 2a shows the rehydration temperature of the products. It was investigated:
  • Figure 2b shows the comparison of the rehydration temperature of the following products:
  • the resulting products were examined by scanning electron microscopy.
  • FIG. 3 shows an SEM image of a gypsum which contained no crystal modifier.
  • the plaster forms elongated crystal needles.
  • FIG. 4 shows a SEM image of a gypsum with the addition of 0.01% by weight of CuSO 4 .5H 2 O.
  • the crystal habit is markedly changed - the crystals are broad and flat with good cross-linking.
  • FIG. 5 shows a SEM image of a gypsum with addition of 0.1% by weight of potassium trimetrasilicate.

Landscapes

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

Abstract

L'invention concerne la fabrication d'une plaque en plâtre qui présente des propriétés améliorées, lequel procédé comprend les étapes suivantes: a) mélange d'une ou plusieurs phases de sulfate de calcium apte à prendre, d'eau et d'un modifiant cristallin sélectionné parmi les sels de métaux lourds bivalents, les silicates de métaux, les borates et leurs mélanges et b) moulage du mélange.
EP07727407A 2006-03-27 2007-03-27 Produit de plâtre Withdrawn EP1999084A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07727407A EP1999084A1 (fr) 2006-03-27 2007-03-27 Produit de plâtre

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP06111740 2006-03-27
EP06114519 2006-05-24
EP07727407A EP1999084A1 (fr) 2006-03-27 2007-03-27 Produit de plâtre
PCT/EP2007/052934 WO2007110428A1 (fr) 2006-03-27 2007-03-27 Produit de plâtre

Publications (1)

Publication Number Publication Date
EP1999084A1 true EP1999084A1 (fr) 2008-12-10

Family

ID=38212249

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07727407A Withdrawn EP1999084A1 (fr) 2006-03-27 2007-03-27 Produit de plâtre

Country Status (2)

Country Link
EP (1) EP1999084A1 (fr)
WO (1) WO2007110428A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014036079A2 (fr) 2012-08-28 2014-03-06 Boston Scientific Neuromodulation Corporation Visualisation de paramètres, interface de sélection et d'annotation
US20150125683A1 (en) * 2013-11-05 2015-05-07 United States Gypsum Company Gypsum products comprising silica gel
WO2020224120A1 (fr) * 2019-05-08 2020-11-12 北新集团建材股份有限公司 Plaque de plâtre revêtue de papier de gypse désulfuré à teneur élevée en impuretés ioniques et son procédé de fabrication
FR3116287B1 (fr) * 2020-11-17 2023-09-29 Norper Plaquette de parement à base de terre

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1015331A (en) * 1963-01-23 1965-12-31 British Plaster Board Holdings Improvements in plaster mixing

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1095412A (fr) * 1953-12-02 1955-06-02 Matériau de construction
CA1279877C (fr) * 1986-08-28 1991-02-05 Richard J. Flanagan Materiau compose a base de gypse, tres solide et resistant au feu
DE4227920A1 (de) * 1992-08-22 1994-02-24 Suedthueringer Entwicklungsges Verfahren zur Herstellung von Baumaterialien, insbesondere von Platten
DE4419257A1 (de) * 1994-06-01 1995-12-07 Wacker Chemie Gmbh Verfahren zur wasserabweisenden Imprägnierung von Gips
JP4721479B2 (ja) * 1997-04-03 2011-07-13 吉野石膏株式会社 気泡入り石膏ボード
DE19906764C2 (de) * 1999-02-17 2002-07-18 Rigips Gmbh Borverbindung enthaltende Gipsfaserplatte und Verfahren zu ihrer Herstellung
US7273579B2 (en) * 2004-01-28 2007-09-25 United States Gypsum Company Process for production of gypsum/fiber board

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1015331A (en) * 1963-01-23 1965-12-31 British Plaster Board Holdings Improvements in plaster mixing

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2007110428A1 *

Also Published As

Publication number Publication date
WO2007110428A1 (fr) 2007-10-04

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