US3862881A - Molded lamellar gypsum product - Google Patents

Molded lamellar gypsum product Download PDF

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Publication number
US3862881A
US3862881A US379306A US37930673A US3862881A US 3862881 A US3862881 A US 3862881A US 379306 A US379306 A US 379306A US 37930673 A US37930673 A US 37930673A US 3862881 A US3862881 A US 3862881A
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gypsum
product
molded
water
mold
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Expired - Lifetime
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US379306A
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Takashi Taniguchi
Kunihiro Abe
Takashi Sugimoto
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Mitsubishi Petrochemical Co Ltd
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Mitsubishi Petrochemical Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/36—Linings or coatings, e.g. removable, absorbent linings, permanent anti-stick coatings; Linings becoming a non-permanent layer of the moulded article
    • B28B7/368—Absorbent linings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B7/00—Moulds; Cores; Mandrels
    • B28B7/40—Moulds; Cores; Mandrels characterised by means for modifying the properties of the moulding material
    • B28B7/46—Moulds; Cores; Mandrels characterised by means for modifying the properties of the moulding material for humidifying or dehumidifying
    • 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
    • C04B2111/00034—Physico-chemical characteristics of the mixtures
    • C04B2111/00068—Mortar or concrete mixtures with an unusual water/cement ratio
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24355—Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
    • Y10T428/24372—Particulate matter
    • Y10T428/24421—Silicon containing
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
    • Y10T428/252—Glass or ceramic [i.e., fired or glazed clay, cement, etc.] [porcelain, quartz, etc.]
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension

Definitions

  • ABSTRACT A gypsum molded structure which comprises gypsum having a lamellar structure in which the (010) planes are uniformly orientated parallel in one direction.
  • the structure is obtained by causing a hydraulically setting material, comprising gypsum, to set as it is subjected, together with excess water, to pressure thereby to discharge the excess water.
  • This invention relates to a method of producing a strong gypsum plaster mold having high density, particularly a gypsum plaster board from a-type or B-type calcined gypsum or anhydrous gypsum, and to a gypsum plaster board with a lamellar structure that cannot be found in the natural state.
  • a gypsum plaster board is made by the steps of kneading a-form or B-form calcined gypsum or anhydrous gypsum with water, and in the case of anhydrous gypsum, together with a solidification promoter, and then solidifying it in a mold.
  • the plaster board thus produced has disadvantageously a specific gravity of 1.1 at most and insufficient mechanical strength.
  • the total quantity of the water added, for example, into calcined gypsum is merely based on the necessary quantity to solidify the gypsum plaster, namely 1.5 in mole ratio with respect to the plaster in accordance with the following reaction formula, and the minimum needed quantity to provide fluidity to the mixture of the plaster and water.
  • the principal object of this invention is to provide a gypsum plaster board having improved mechanical strength and high density of gypsum, of lamellar structure, which is applicable for use as wall material, tiles, floor board, and the like, and a method of producing the same.
  • Another object of this invention is to provide a building board material which has a smooth surface and a good exterior appearance and is directly applicable as an external building material, and also is printable by various manners, for example anastati'c printing, and silk-screen printing, and to provide a method of producing the same.
  • a further object of this invention is to provide a method of producing building board material whereby relief designs can be imparted to the board.
  • this invention is characterized by a gypsum plaster molded material comprising gypsum having a lamellar structure wherein the (010) planes are uniformly oriented toward one direction in parallel.
  • a method of producing a gypsum plaster molded material having a lamellar structure is characterized by the steps of mixing a hydraulically setting material water-solidifying substance calcined gypsum or anhydrous gypsum with water in a quantity greater than the theoretical quantity to set the hydraulically setting material and sufficient to keep the fluidity of the material and setting the mixture, applying the pressure at least while the hydraulically setting'material is fluid under the pressure in order that excessive water for the solidification be removed.
  • FIG. 1 is an electron-photomicrograph of a crystal of a-form calcined gypsum
  • FIG. 2 is an electron-photomicnograph of crystals of B-form calcined gypsum
  • FIG. 3 is an electron-photomicrograph of gypsum having a lameller structure
  • FIG. 4 is a graphical representation of the relation between the compressive strength of a gypsum product according to this invention and the elapsed time;
  • FIG. 5 is a graphical representation of the relation between the bending strength of a. gypsum product according to this invention and the elapsed time;
  • FIG. 6 is a sectional view of one example of a mold
  • FIG. 7 is a sectional view of another example of a mold
  • FIG. 8 shows an X-ray diffraction chart of a molded gypsum product wherein X-ray incidence is perpendicular to the surface of the product to which pressure has been applied;
  • FIG. 9 shows an X-ray diffraction chart of a molded gypsum product wherein X-ray incidence is parallel with the surface of the product to which pressure has been applied;
  • FIG. 10 shows an X-ray diffraction chart of a molded product produced from a mixture of gypsum and portland cement (1:1) wherein X-ray incidence is perpendicular to the surface of the product to which pressure has been applied;
  • FIG. 11 shows an X-ray diffraction chart of a molded product produced from a mixture of gypsum and portland cement (1:1) wherein X-ray incidence is parallel with the surface of the product to which pressure has been applied.
  • This invention in one aspect thereof, relates to a method of producing a gypsum plaster product, particularly a gypsum plaster board.
  • This method is characterized by the process steps of mixing a hydraulically setting material comprising gypsum with excessive water, and removing the excess during the cause of setting of the hydraulically setting material under pressure.
  • the solidification time, or the dehydration time is shorter, even as short as 10 seconds, and curing and drying times are not necessary.
  • the produced mold has improved dimensional stability with respect to heat and water since the distance between the inorganic particles has been shortened by pressure, and the attraction therebetween is larger.
  • the surface of products is smooth and is also printable since the mixture of gypsum and water is highly homogeneous due to the presence of excessive water and to ease of kneading and since the mixture is caused to setting under pressure.
  • the plaster board can have relief design (relievo or intaglio) thereon when a mold provided with corresponding relief pattern therein is used.
  • relief design is formed by adhesion of powder of gypsum or the like by means of an adhesive
  • the operation is not easy, and the thickness of the relievo is 1mm at most because of the relievo construction being brittle.
  • a sculpture method provides a thicker relievo, the process requires a harder operation.
  • the relief design can be imparted on the molded product in the process of molding, and the relievo construction is quite strong and has a thickness of about 10mm with a good appearance.
  • the quantity of the water added into calcined gypsum and/or anhydrous gypsum be between the theoretical or stoichiometric quantity for the set of the gypsum and 50 times that quantity.
  • the quantity is more than 50 times the theoretically necessary quantity, the required mold is too large, and a large vessel to mix the water and gypsum therein is necessary; hence, it is not desirable from the economical standpoint.
  • the quantity of the water preferably stands between 1 and 10 times the theoretical quantity, and, more preferably between 4 and 10 times.
  • the pressure be more than 1 kg/cm just in order to shorten the molding time, while is preferably more than 4 kg/cm to produce rather a strong product such as flooring material.
  • the upper limit of is sucked from outside under reduced pressure in combination with the inner compression.
  • the system under setting is preferably kept below 40C since the reaction of water and calcined gypsum and/or anhydrous gypsum is exothermic, and the strength of the product becomes worse when the temperature becomes high.
  • the tensile strength decreases by 20 percent at 40C as compared with that at 20C when setting the mixture of water'and ,B-form calcined gypsum after dehydration under pressure.
  • the lower limit of the temperature is the freezing point of the system, particularly the temperature range between about 0C and 38C is preferred.
  • At least one part of the mold exemplarily the bottom thereof is made of porous material, such as, for examples, a sintered metal, or otherwise the bottom is provided with a water-excluding opening, such as, for example, a plurality of capillaries or perforation in communication between the inside and the outside of the mold.
  • a water-excluding opening such as, for example, a plurality of capillaries or perforation in communication between the inside and the outside of the mold.
  • microporous material such as paper, paper board, fabrics, non-woven fabrics is possibly laid in the mold.
  • the microporous material can be so used as to constitute the surface of the molded plaster product as an integral part thereof.
  • the pressure is applied at least during the period when the hydraulically setting material is fluid under the pressure.
  • EXAMPLE 1 fl-form calcined gypsum and water were mixed and stirred in a weight ratio of 2:1 (2.5 times the theoretical quantity of water), and the mixture was poured into a press mold provided with a bottom made of a porous sintered metal, and was pressed within the mold to the bottom to remove excess water and set the gypsum whereby a gypsum plasterboard was produced.
  • EXAMPLE 3 In general, gypsum is classified into three classes in accordance with the content of water of crystallization. The compound may possibly be interchanged according to the following formula, and the molecule structure, crystal structure, and nature, etc. have been studied.
  • EXAMPLE 4 In this regard, CaSO .2H O, a-and B-CaSO,./2H G Table 4 and II and III-CaSO, are respectively classified under the name of crystalline or dihydrated gypsum, clacined gypsum, and anhydrous gypsum, and a-form of calcined gypsum differs from B-form in the crystal struc ture, and II and III of anhydrous gypsum differ from each other in the solubility in water; ll-type is not soluble, while III-type is soluble.
  • FIG. 3 shows the crystal structure of The known crystal structures are the particle-type (oz-form) or otherwise the needle-type (B-form), while the gypsum that has been set in accordance with this invention has lamellar structure, so it is considered that the molded gypsum product has a higher density, and better physical strength because of the stronger attraction between crystals, and can decrease the rate of water molecule entering into it.
  • various tests have illustrated the improvements of the hardness, compression strength, bending strength, etc.; gypsum that has been set a short time.
  • FIG. 3 of the section of a gypsum molded product which has been produced from B-form gypsum under application of pressure in accordance with this invention shows that the crystals are in a lamellar structure which comprises laminas arranged perpendicular to the direction of the pressure, which is clearly different from the conventional crystal structure obtained from B-form calcined gypsum which is needle-like or fine plate-like as shown in FIG. 2 and obtained from a-form calcined gypsum which is particlelike or pillar-like as shown in FIG. 1.
  • the products produced according to this invention have Iamellar structure in which the crystal plane is oriented in a certain direction. Therefore, the present product of this invention has improved physical properties which have heretofore never been attained.
  • hydraulically setting inorganic powder materials for example, portland cement, highsulphate slag cement, white cement, magnesia cement, and the like contain 3-l0 wt percent of calcined gypsum.
  • cement mortar comprising cement, sand, and water, the quantity of water is 20-30 percent by weight of the cement in the case of thick mortar, and -70 percent by weight of the cement in the case of thin mortar. Such mortars are then cured in practice.
  • This invention is also applicable for using the above mentioned hydraulically setting inorganic powder material containing calcined gypsum. According to this invention, a strong product will be produced by the steps ofadding such quantity of water as more than the theoretical quantity necessary to set the hydraulically setting inorganic powder material and enough to keep the fluidity of the mixture, and setting the mixture under pressure, at the same time removing the excess water.
  • gypsum in combination with one or more selected from any of hydraulically setting inorganic powder material such as white cement, portland cement, magnesia cement, furnace cement, mortar, etc.
  • gypsum and a cement such as white cement or portland cement as hydraulically setting inorganic powder material are employed in a weight ratio of gypsum of more than 30 percent to the total weight of gypsum and cement, the product will be stronger than that made solely of the hydraulically setting inorganic powder material.
  • hydraulically setting inorganic powder material herein used is thus intended to cover any such hydraulically setting inorganic material in a powder form as gypsum, plaster, hydraulic cements, and mixtures thereof; and preferably gypsum-based ones such as gypsum, plaster, and mixtures of gypsum and a hydraulic cement containing more than 3 percent, preferably 20 percent by weight of the mixture of the two.
  • Portland cement usually contains some percentages, e.g., 3 percent by wt. of gypsum.
  • FIG. 10 and FIG. 11 show X-ray diffraction charts for the molded product as one embodiment of the present invention, which product has been produced from the mixture of gypsum and portland cement in 1:1 weight ratio.
  • FIGS. 10 and 11 are the same in nature as FIGS. 8 and 9 except that the hydraulically-setting material consists solely of gypsum for FIGS. 8 and 9 while it consists of the mixture of gypsum and portland cement. Similar diffraction patterns can be seen even when gypsum is in admixture with portland cement in l:l weight ratio. Electron-photomicrographs of the molded product produced under pressure from a mixture of gypsum and portland cement in H weight ratio show some lamellar structures but the structures are not so distinct.
  • an inorganic or organic filler may possibly be added into the hydraulically-setting inorganic powder material for the purpose of (1) improving the strength of the molded products (2) giving variation on the appearances, (3) adjusting the specific gravity.
  • the inorganic filler may be selected from known inorganic filler materials such as: bauxite, fluorite, cryolite, graphite, artificial graphite, colloidal graphite, silica, flint pebbles, siliceous sand, sulfur, barite, alumite, borax, fire clay, aluminous shale, sillimanites, agalmatolite, fire silica, dolomite, Magnesite, peridotite, feldspar, potteny stone, wollastonite, lithium mineral, asbestos, mica, rock crystal, quartz, calcite, garnet, corundum, gilsonite, vermiculite, perlite, pumice, pozzolana including fly ashes, natural slate, swollen shale, kaolin, talc, bentonite, acid terra alba, diatomaceous earth, zeolite, metal minerals, andesice, grnite, graywacke
  • The-organic filler may be selected from known organic filler materials such as: wool powder, wood chips hemp, wood wool, pieces of stretched plastic film, stretched fiber of plastics, especially those containing such an inorganic material, as a filler, pieces of foamed plastics, pieces of plastics, paper, rubber, bamboo, fabrics, rush, bagasse piece, bark of 'peanut, and plastic oligomers.
  • organic filler materials such as: wool powder, wood chips hemp, wood wool, pieces of stretched plastic film, stretched fiber of plastics, especially those containing such an inorganic material, as a filler, pieces of foamed plastics, pieces of plastics, paper, rubber, bamboo, fabrics, rush, bagasse piece, bark of 'peanut, and plastic oligomers.
  • the quantity of the inorganic or organic filler added to the hydraulically-setting inorganic powder material is preferably below 50 percent by weight of the total weight of the mixture.
  • the content of gypsum or the hydraulically-setting inorganic powder material is below 3 percent by weight, the products cannot have sufficient strength, since such a small quantity of gypsum is not enough to bind all of the inorganic or organic filler within the product.
  • the gypsum product according to this invention is typically a plaster board, particularly a board product with 2 to 50 mm of thickness. It is, or course, possible to mold it into other shapes such as column. rectangular cylinder, block etc. These molded products may be either equal or unequal as to their inner organization or texture or as to their chemical composition.
  • An example for the latter is a product comprising pure gypsum surface and core made of something other than pure gypsum such as white cement.
  • the product may possibly have a surface made of a porous material such as paper and fabrics adhered thereto.
  • EXAMPLE 5 After mixing and stirring white cement and water in weight ratio of 2:1, and pouring the mixture into the same mold as described in Example 2, it was molded under pressure as shown in Table 6 for 5 minutes, and the molded product was taken out of the mold. Results of the tests on the product left as it was for a day are shown in Table 6.
  • the specific gravity of the product may be adjusted by varying the pressure.
  • EXAMPLE 6 After mixing and kneading B-form calcined gypsum, white cement and water in a weight ratio of 1:122, and pouring the mixture into the same mold as described in Example 2, it was caused to set under pressure of kg/cm for 5 minutes, and product A with a specific gravity of 2.0 was produced.
  • a mixture of B-form calcined gypsum and water in a weight ratio of 1:1 were respectively molded in the same condition as above, and product B with a specific gravity of 1.9 and product C with a specific gravity of 2.1 were respectively produced.
  • the starting point of the elapsed time is the time fifteen minutes after when the molded product was taken out of the mold.
  • EXAMPLE 10 A complex mono-filament made of poly propylene and portland cement dispersed therein was added at 2 wt percent into a kneaded mixture of B-form gypsum, portland cement, red mud, and water in a weight ratio of l:l:3:2, and the mixture was poured into the same mold as in Example 2. Then molded products with various specific gravity in accordance with the variation of the pressure were produced under pressure through a pressuring period of 5 minutes (but water discharge period of 10 seconds) of setting.
  • the product had a convex relief design precisely corresponding to that of the mold, a specific gravity of 2.0, compression strength of 461 kg/cm and bending strength of 59 kg/cm
  • An apparatus shown in FIG. 6 was used a liquid slurry of calcined gypsum and water in a weight ratio of 2:1 was poured into the room 3 of the female mold where the bottom is made of sintered porous metal 1 as shown in FIG.
  • the product had a convex relief design precisely corresponding to that of the male mold and a specific gravity of 1.9, compression strength of 447 kg/cm and bending strength of 56 kg/cm 1f the polyethylene film is not employed, the relief desion Pnrrecnnnrlino tn thp heart nf tannr 1min" mnro floor 13 90 is partly broken and the product does not have a good appearance.
  • Example 10 when the taper is beyond 90 (or so-called reverse taper), the molded product will be partly broken and show a bad appearance when it is demolded from a mold unless flexible film is placed between the product and the mold.
  • chipped products will be formed unless use is made of flexible film sheet is placed between the product and the mold.
  • Such film may be a flexible film with a thickness of, for example, 0.02 to, 1mm preferably 0.1 to 0.3 mm, of such as low density polyethylenes, ethylene-vinyl acetate copolymers, plasticized polyvinyl chloride, vinylidene chloride. cellophane, vinyl chloride-vinylidene chloride copolymers, high density polyethylenes, ny- Ion, polyester resin. and ethylene-propylene copolymers.
  • a relief design by reverse taper is well formed, if the width L, of the entrance of the cavity of the mold 5 and the length L: of the cavity at the broadest part are in accordance with the following relation as shown in H6. 7.
  • a molded gypsum product which comprises gypsum crystals having a lamellar structure.
  • a molded gypsum product the gypsum component of which has a crystalline structure by X-ray diffraction, said crystalline structure being characterized in that (010) planes thereof are arranged in one direction.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical 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)
  • Press-Shaping Or Shaping Using Conveyers (AREA)
US379306A 1972-07-19 1973-07-16 Molded lamellar gypsum product Expired - Lifetime US3862881A (en)

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JP47071648A JPS4929316A (fr) 1972-07-19 1972-07-19

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US (1) US3862881A (fr)
JP (1) JPS4929316A (fr)
BE (1) BE802564A (fr)
CA (1) CA1031551A (fr)
DE (1) DE2336321B2 (fr)
FR (1) FR2192984B1 (fr)
GB (1) GB1438404A (fr)

Cited By (9)

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US4081283A (en) * 1976-02-23 1978-03-28 Pmcma Research Group Plaster molding composition
US4687694A (en) * 1985-02-13 1987-08-18 Kuper Nina M Decorative tile
US5556578A (en) * 1993-12-23 1996-09-17 W. R. Grace & Co.-Conn. Aggregate containing hydration water in spray applied fireproofing
EP1643010A1 (fr) * 2004-10-04 2006-04-05 HABAS Innovation GmbH Revêtement anti-condensation
US20060137276A1 (en) * 2003-09-12 2006-06-29 Hans-Ulrich Hummel Construction material based on gypsum
US20070031704A1 (en) * 2005-08-04 2007-02-08 Sgl Carbon Ag Gypsum-based building material having increased thermal conductivity and shielding attenuation, method for producing the building material, molding containing the building material and method for producing the molding
CZ298882B6 (cs) * 2003-03-28 2008-03-05 Výzkumný ústav stavebních hmot, a. s. Tepelne odolný konstrukcne-izolacní materiál
CN110467417A (zh) * 2018-05-11 2019-11-19 北新集团建材股份有限公司 一种用于3d打印的石膏基干混砂浆及其制备方法
CN112870219A (zh) * 2021-01-20 2021-06-01 荆门千年健医疗保健科技有限公司 一种石膏丸、其制备方法及石膏丸药枕

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JPS53130721A (en) * 1977-04-21 1978-11-15 Kubota Ltd Method of making cement building material
JPS5466919A (en) * 1977-10-27 1979-05-29 Kuniyasu Riyouke Improved method of concrete product casting
JPS57128730A (en) * 1981-02-03 1982-08-10 Osaka Soda Co Ltd Preparation of rubber composition
DE3472552D1 (en) * 1984-10-04 1988-08-11 Gips Union Ag Process for the dry production of gypsum-based construction boards
DE3903641A1 (de) * 1989-02-08 1990-08-09 Fulgurit Baustoffe Gmbh Verfahren zur herstellung von gipsfaserplatten
DE4008084A1 (de) * 1990-03-14 1991-09-19 Pro Mineral Ges Verfahren zur herstellung von gipsfaserplatten, insbesondere von fussbodenplatten
GB2444926A (en) * 2006-12-18 2008-06-25 Robert John Bracher Coating material containing a lithium-containing silicate mineral
CN102173717B (zh) * 2011-01-05 2012-11-21 张彩云 一种高强轻质环保保温防火板的生产方法
CN108117313A (zh) * 2016-11-28 2018-06-05 华夏安居（天津）节能科技有限公司 硅胶石墨板及其制备方法
CN111302713A (zh) * 2020-03-16 2020-06-19 吴银鑫 一种耐用环保积木砖及其制备方法

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US2451446A (en) * 1943-09-06 1948-10-12 United States Gypsum Co Light-weight fiber containing product
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US3459571A (en) * 1966-01-10 1969-08-05 Owens Corning Fiberglass Corp Reinforced hydraulic cements and casts therefrom
US3481829A (en) * 1967-07-27 1969-12-02 Nat Gypsum Co Method of sizing paper with silicone resin and of making gypsum wallboard therefrom

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US2239861A (en) * 1937-04-28 1941-04-29 United States Gypsum Co Method of making plastic products
FR1047303A (fr) * 1951-08-17 1953-12-14 Fornaci Riunite S P A Procédé et dispositif pour le moulage d'objets céramiques et de briques

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US3459571A (en) * 1966-01-10 1969-08-05 Owens Corning Fiberglass Corp Reinforced hydraulic cements and casts therefrom
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Cited By (12)

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US4081283A (en) * 1976-02-23 1978-03-28 Pmcma Research Group Plaster molding composition
US4687694A (en) * 1985-02-13 1987-08-18 Kuper Nina M Decorative tile
US4693924A (en) * 1985-02-13 1987-09-15 Kuper Nina M Decorative tile
US5556578A (en) * 1993-12-23 1996-09-17 W. R. Grace & Co.-Conn. Aggregate containing hydration water in spray applied fireproofing
CZ298882B6 (cs) * 2003-03-28 2008-03-05 Výzkumný ústav stavebních hmot, a. s. Tepelne odolný konstrukcne-izolacní materiál
US20060137276A1 (en) * 2003-09-12 2006-06-29 Hans-Ulrich Hummel Construction material based on gypsum
US7645527B2 (en) * 2003-09-12 2010-01-12 Knauf Gips Kg Gypsum-based building material
EP1643010A1 (fr) * 2004-10-04 2006-04-05 HABAS Innovation GmbH Revêtement anti-condensation
US20070031704A1 (en) * 2005-08-04 2007-02-08 Sgl Carbon Ag Gypsum-based building material having increased thermal conductivity and shielding attenuation, method for producing the building material, molding containing the building material and method for producing the molding
CN110467417A (zh) * 2018-05-11 2019-11-19 北新集团建材股份有限公司 一种用于3d打印的石膏基干混砂浆及其制备方法
CN110467417B (zh) * 2018-05-11 2020-11-13 北新集团建材股份有限公司 一种用于3d打印的石膏基干混砂浆及其制备方法
CN112870219A (zh) * 2021-01-20 2021-06-01 荆门千年健医疗保健科技有限公司 一种石膏丸、其制备方法及石膏丸药枕

Also Published As

Publication number Publication date
CA1031551A (fr) 1978-05-23
FR2192984B1 (fr) 1977-05-13
DE2336321B2 (de) 1977-11-03
DE2336321A1 (de) 1974-01-31
JPS4929316A (fr) 1974-03-15
FR2192984A1 (fr) 1974-02-15
BE802564A (fr) 1973-11-16
GB1438404A (en) 1976-06-09

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