WO1995028229A1 - Procede d'application d'une matiere sur un substrat - Google Patents

Procede d'application d'une matiere sur un substrat Download PDF

Info

Publication number
WO1995028229A1
WO1995028229A1 PCT/FI1994/000145 FI9400145W WO9528229A1 WO 1995028229 A1 WO1995028229 A1 WO 1995028229A1 FI 9400145 W FI9400145 W FI 9400145W WO 9528229 A1 WO9528229 A1 WO 9528229A1
Authority
WO
WIPO (PCT)
Prior art keywords
mass
alkali silicate
powder
dry
water
Prior art date
Application number
PCT/FI1994/000145
Other languages
English (en)
Inventor
Pentti Valoranta
Original Assignee
Pentti Valoranta
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 Pentti Valoranta filed Critical Pentti Valoranta
Priority to PCT/FI1994/000145 priority Critical patent/WO1995028229A1/fr
Priority to AU64315/94A priority patent/AU6431594A/en
Publication of WO1995028229A1 publication Critical patent/WO1995028229A1/fr
Priority to FI964081A priority patent/FI964081A/fi

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
    • B28C5/08—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions using driven mechanical means affecting the mixing
    • B28C5/10—Mixing in containers not actuated to effect the mixing
    • B28C5/12—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers
    • B28C5/14—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers the stirrers having motion about a horizontal or substantially horizontal axis
    • B28C5/142—Mixing in containers not actuated to effect the mixing with stirrers sweeping through the materials, e.g. with incorporated feeding or discharging means or with oscillating stirrers the stirrers having motion about a horizontal or substantially horizontal axis the stirrer shaft carrying screw-blades
    • 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
    • C04B28/24—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 alkyl, ammonium or metal silicates; containing silica sols
    • C04B28/26—Silicates of the alkali metals
    • 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
    • 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
    • C04B2111/00034—Physico-chemical characteristics of the mixtures
    • C04B2111/00146—Sprayable or pumpable mixtures
    • C04B2111/00155—Sprayable, i.e. concrete-like, materials able to be shaped by spraying instead of by casting, e.g. gunite

Definitions

  • the present invention relates to a method for applying a mass onto a substrate using a spray, in the mixer part whereof dry, powder-like mass and water are supplied so that they are mixed into a paste or sludge conducted from the mixer part via the nozzle end of the spray onto a substrate.
  • Such spray coating apparatus are commercially available which comprise in the mixer part thereof a mixer screw rotating around the axis thereof in a cylindrical passage and where ⁇ through the mixer part has via a flexible hose been connected to the nozzle end.
  • Said means are used by supplying dry, powder-like coating mass to the first end of the passage, wherefrom a screw pushes it towards the other end of the passage and the hose leading to the nozzle at the same time as the mass is being mixed with water fed to the passage from a supply pipe attached to the side thereof.
  • pressurized air is used as an aid, this being fed via a separate pipe to the nozzle end.
  • Alkali silicates have been used for coating masses in the form of through-dry particles which are characterized by slow dissolution in water.
  • the objective of the present invention is to produce a problem solution to enable the use of prior art spray coat ⁇ ing apparatus described above, provided with mixer screws or equivalent apparatus, also in applying masses containing al ⁇ kali silicate.
  • the invention is characterized in that the dry, powder-like mass supplied to the mixer part of the means contains mechanically ground alkali silicate and at least one non-hygroscopic component acting as a stabilizer to the al ⁇ kali silicate, whereby the water added in the mass in the mixer part dissolves the alkali silicate prior the extrusion of the mass out of the nozzle end onto the substrate.
  • the problem-solution according to the present invention is made conceivable by the fact that an alkali silicate produced mechanically by grounding, such as ground water-glass or po- tassic water-glass, with particle size below 100 ⁇ m, prefer ⁇ ably 0.1 to 10 ⁇ , is rapidly water-soluble.
  • the dissolution is followed by instant gel-formation increasing the viscosity of the alkali silicate containing coating mass, and turning the mass first into porridge-like and then cement-like in a few minutes after water addition.
  • Such rapid stiffening of the mass is a remarkable advantage, particularly on walls and other vertical surfaces, the mass applied whereon being soli- dified without starting to run.
  • An alkali silicate powder produced mechanically by grinding is not only fast-dissolving, but also highly hygroscopic.
  • the powder absorbs moisture from the air, whereby it becomes caked and in the end turns into a hard, glassy mass, i.e. it returns into the state it had before being ground. Therefore, it is necessary that in a dry, powder-like mass used ac ⁇ cording to the invention, at least one stabilizer component is included, besides the alkali silicate, to prevent the mass from being caked.
  • the function of the stabilizer is primarily to keep the alkali silicate particles sufficiently apart from one another, and the quality thereof is not as such critical.
  • a stabilizer found to be appropriate is formed from hollow, water-indissoluble glass pearls made from alkali silicate, the particle size thereof being about 50 to 300 ⁇ m.
  • Said product can be mixed in ground alkali silicate about 40 to 55 per cent by weight, preferably about 50 per cent by weight.
  • a finely powdered quartx powder may be mentioned, the particle size thereof being below 0.1 ⁇ m, preferably about 2 to 40 nm.
  • Such product is, for instance, Aerosil 200 marketed by Degussa AG, being hy- drophilic and with an average particle size in the range of 7 to 40 nm.
  • the stabilizing effect of the quartz particles is assumed to be based on the idea that they accumulate as a protective layer around larger alkali silicate particles, and it has been found that about 3 to 10 per cent by weight, ad ⁇ vantageously about 5 per cent by weight of quartz suffices for stabilization, calculated from the amount of alkali silicate.
  • the stabilizer In order to prevent the ground alkali silicate from caking, the stabilizer has to be added therein appropriately in the above weight ratios immediately after the grinding. In this manner the stabilized alkali silicate is therafter mixed with the rest of the solid components of the coating into a mass which can be produced in bags, emptied as such on the site into the supply end the mixer screw of the coating apparatus. For transforming the mass into sprayable paste or sludge, clean tap water conducted into the mixer part of the means is a sufficient measure.
  • the method according to the present invention is appropriate for applying coating masses containing particularly alkali silicate, such as water-glass or potassic water-glass, on various substrates.
  • a substrate may consist of a stone, brick or concrete surface, or a gypsum, minerite or plastic board which can be positioned on a wall or floor either indoors or out of doors. Also providing an insulation material such as mineral wool with a coating layer is possible, whereby for supporting the coating e.g. glassfiber net can be used.
  • An alkali-silicate containing coating mass applied according to the invention can be cement-based mass or mortar, in which the base material can be limestone, sand or cement, or a mix ⁇ ture thereof.
  • An appropriate proportion of alkali silicate in the mass is about 3 to 10 parts by weight per 100 parts by weight per said base material.
  • For the portion by weight of the stabilizer included together with the alkali silicate will then be about 0.1 to 5 parts by weight depending on the stabilizer used.
  • the mass may contain e.g. iron oxide or equivalent colouring agent and other ingredients of coating masses known themselves in the art.
  • FIG. 1 presenting a spray-coating means appropriate for mass application, and by presenting examples of the dry matter compositions of the coating mass.
  • the spray-coating means comprises a mixer part 1 standing supported by a stand 2, a nozzle end 3 and an elastic rubber hose 4 connecting the mixer part and the nozzle end.
  • the mixer part 1 carries out the mixing of dry powder-like coating mass containing, according to the present invention, mechanically ground alkali silicate with water, the rubber hose 4 leads the mass sludge produced in the mixer part 1 to the nozzle end 3, and the nozzle end spreads the sludge with the aid of pressurized air onto a substrate to be coated.
  • the mixer part 1 comprises a fill-in container 5 open at the upper end, wherein the dry powder containing the solid in- gredients of the coating mass is vacated from a bag opened by breaking it by hitting it against an upwards curved toothed blade 6 arranged for said purpose in the upper end of the container.
  • a horizontal mixer screw 7 is placed, being rotated around the axis 8 by an electric motor 9 by means of a V-belt 10 and a groove wheel 11.
  • the mixer screw 7 extends from the lower part of the container 5 into a passage 13 defined by a cylindrical mantle 12, from the latter end 14 whereof an opening leading to the hose 4 connecting the mixer part 1 and the nozzle end 3.
  • the nozzle end 3 is provided with a pressurized air line 16, which, for fa ⁇ cilitating the work, has according to the drawing been at ⁇ tached to the hose 4 supplying the sludge.
  • the nozzle end 3 has moreover been provided with an on/off lever 17, a fine- adjustment screw 18 and a metal tip piece 19 provided with a nozzle aperture.
  • Solid, glassy water-glass dried from an aqueous solution of sodium silicate is ground mechanically into a powder with particle size below 100 ⁇ m, prferably below 10 ⁇ m.
  • a product called Enlett 300 is added as a stabilizer so that the proportion of each component in the mixture is 50 per cent by weight.
  • the dry ingredients of the coating mass were mixed as follows:
  • All components of the coloured coating mass described above, with the exception of the pigment, are white.
  • the weight of the mass is about 2 kg per dm 3 .
  • the mass can be prepared as bulk goods in bags to be mixed on the site in the mixer part of the spray with water and applied via the nozzle end on a substrate to be coated.
  • the powder composition described above can be varied in a number of part,s depending on the purpose of the coating.
  • the amount of the pigment may vary in the range 0.5 to 4 parts by weight, and the type can be selected according to the colour desired. If the colour of the coating is of no significance, the lime stone can be replaced partly or totally with sand, and the white cement with ordinary cement.
  • Stabilized alkali silicate can be used in 5 to 10 parts by weight so that when the basic material is coarser in grain size, the amount of the alkali silicate is greater.
  • the stabilizer Enlett 300 can be replaced e.g. by a product called Aerosil 200, whereby the mixing ratio in a stabilized alkali silicate is e.g. 95 per cent by weight of alkali silicate and 5 per cent by weight of Aerosil 200.
  • the basic material of the coating mass was prepared by mixing 2 parts of lime stone powder Marmorcross F, 3 parts of lime stone powder Marmorcross B, 2.5 parts of glass pearls of aluminium silicate Enlett 1 (Nordiska Mineral. Inc.), 2.5 parts of a product called Perlite Microspheres (Noble Materials Inc.), and 1.8 parts white cement.
  • the powder-like coating mass was prepared by mixing
  • a characteristic feature of the above coating mass is the lightness thereof, the mass weighing only about 1.2 kg per dm 3 .
  • the mass is particularly appropriate for coating cr ⁇ lings and other interior surfaces.
  • the composition may be varied, for instance, by increasing the proportion of coarser granules of the base material, whereby the amount of alkali silicate can respectively be increased.
  • the amount of the stabilized alkali silicate may vary from 3 to 5 parts by weight and the amount of pigment e.g. 0.4 to 5 parts by weight per 100 parts of base material.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Structural Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Paints Or Removers (AREA)

Abstract

La présente invention se rapporte à un procédé d'application d'une matière sur un substrat à l'aide d'un pulvérisateur comprenant une partie mélangeuse (1) et une extrémité formant ajutage (3). Dans la partie mélangeuse (1), une matière sèche pulvérulente et de l'eau sont mélangées pour former une pâte ou bouillie qui est déchargée par l'ajutage (3) sur le substrat à l'aide d'air sous pression. Selon l'invention, cette matière sèche pulvérulente, mélangée à l'eau, contient un silicate alcalin broyé mécaniquement et au moins un constituant non hygroscopique agissant comme stabilisateur du silicate alcalin. L'eau ajoutée à la matière sèche dissout le silicate alcalin avant la décharge de la matière par l'ajutage. Suivant l'invention, il est ainsi possible d'appliquer, notamment, des matières de revêtement à base de chaux vive, dans lesquelles le silicate alcalin, tel que du verre soluble ou du verre soluble potassique, sert de constituant de renforcement procurant auxdites matières l'imperméabilité, et dans lesquelles le stabilisateur du silicate alcalin peut se composer de poudre de quartz ou de perles de silicate d'aluminium qui permettent de prévenir l'agglutination précoce de la poudre de silicate alcalin.
PCT/FI1994/000145 1994-04-18 1994-04-18 Procede d'application d'une matiere sur un substrat WO1995028229A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PCT/FI1994/000145 WO1995028229A1 (fr) 1994-04-18 1994-04-18 Procede d'application d'une matiere sur un substrat
AU64315/94A AU6431594A (en) 1994-04-18 1994-04-18 Method for applying a mass onto a substrate
FI964081A FI964081A (fi) 1994-04-18 1996-10-11 Menetelmä massan levittämiseksi alustalle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FI1994/000145 WO1995028229A1 (fr) 1994-04-18 1994-04-18 Procede d'application d'une matiere sur un substrat

Publications (1)

Publication Number Publication Date
WO1995028229A1 true WO1995028229A1 (fr) 1995-10-26

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ID=8556581

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1994/000145 WO1995028229A1 (fr) 1994-04-18 1994-04-18 Procede d'application d'une matiere sur un substrat

Country Status (2)

Country Link
AU (1) AU6431594A (fr)
WO (1) WO1995028229A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003008167A1 (fr) * 2001-07-16 2003-01-30 United States Gypsum Company Appareil et procede pour melanger et distribuer une pate fluide renforcee d'un additif
US7611275B2 (en) * 2007-06-14 2009-11-03 Crespo Pedro R Portable cement mixing and dispensing assembly
US7718019B2 (en) 2005-04-27 2010-05-18 United States Gypsum Company Methods of and systems for preparing a heat resistant accelerant slurry and adding the accelerant slurry to a post-mixer aqueous dispersion of calcined gypsum
US8016960B2 (en) 2005-04-27 2011-09-13 United States Gypsum Company Methods of and systems for adding a high viscosity gypsum additive to a post-mixer aqueous dispersion of calcined gypsum
WO2023002247A1 (fr) * 2021-07-22 2023-01-26 Vicat Tête d'impression tridimensionnelle pour l'impression d'une structure tridimensionnelle

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2063236A5 (en) * 1969-09-05 1971-07-09 Garreau Jean Pneumatic projection device for refrac-tory powders
US4804563A (en) * 1986-02-13 1989-02-14 Hochtief Aktiengesellschaft Vorm. Gebr. Helfmann Method and apparatus for the spray placing of concrete layers
GB2241499A (en) * 1990-03-03 1991-09-04 Sandoz Ltd Sprayed concrete mixtures
WO1994019279A1 (fr) * 1993-02-22 1994-09-01 From Kenneth Produit pulverulent contenant du silicate alcalin finement fractionne et procede d'obtention

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2063236A5 (en) * 1969-09-05 1971-07-09 Garreau Jean Pneumatic projection device for refrac-tory powders
US4804563A (en) * 1986-02-13 1989-02-14 Hochtief Aktiengesellschaft Vorm. Gebr. Helfmann Method and apparatus for the spray placing of concrete layers
GB2241499A (en) * 1990-03-03 1991-09-04 Sandoz Ltd Sprayed concrete mixtures
WO1994019279A1 (fr) * 1993-02-22 1994-09-01 From Kenneth Produit pulverulent contenant du silicate alcalin finement fractionne et procede d'obtention

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003008167A1 (fr) * 2001-07-16 2003-01-30 United States Gypsum Company Appareil et procede pour melanger et distribuer une pate fluide renforcee d'un additif
US6874930B2 (en) 2001-07-16 2005-04-05 United States Gypsum Company Slurry mixer outlet
US7718019B2 (en) 2005-04-27 2010-05-18 United States Gypsum Company Methods of and systems for preparing a heat resistant accelerant slurry and adding the accelerant slurry to a post-mixer aqueous dispersion of calcined gypsum
US8016960B2 (en) 2005-04-27 2011-09-13 United States Gypsum Company Methods of and systems for adding a high viscosity gypsum additive to a post-mixer aqueous dispersion of calcined gypsum
US7611275B2 (en) * 2007-06-14 2009-11-03 Crespo Pedro R Portable cement mixing and dispensing assembly
WO2023002247A1 (fr) * 2021-07-22 2023-01-26 Vicat Tête d'impression tridimensionnelle pour l'impression d'une structure tridimensionnelle
FR3125458A1 (fr) * 2021-07-22 2023-01-27 Vicat Tête d’impression tridimensionnelle pour l’impression d’une structure tridimensionnelle

Also Published As

Publication number Publication date
AU6431594A (en) 1995-11-10

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