WO2011052048A1 - Plaque de plâtre - Google Patents

Plaque de plâtre Download PDF

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Publication number
WO2011052048A1
WO2011052048A1 PCT/JP2009/068465 JP2009068465W WO2011052048A1 WO 2011052048 A1 WO2011052048 A1 WO 2011052048A1 JP 2009068465 W JP2009068465 W JP 2009068465W WO 2011052048 A1 WO2011052048 A1 WO 2011052048A1
Authority
WO
WIPO (PCT)
Prior art keywords
gypsum
slurry
mass
parts
calcined
Prior art date
Application number
PCT/JP2009/068465
Other languages
English (en)
Japanese (ja)
Inventor
巧 藤田
秀隆 本多
康祐 堤
Original Assignee
チヨダウーテ株式会社
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 チヨダウーテ株式会社 filed Critical チヨダウーテ株式会社
Priority to KR1020117030182A priority Critical patent/KR20120070543A/ko
Priority to JP2011538149A priority patent/JPWO2011052048A1/ja
Priority to CN200980162305XA priority patent/CN102712535A/zh
Priority to PCT/JP2009/068465 priority patent/WO2011052048A1/fr
Publication of WO2011052048A1 publication Critical patent/WO2011052048A1/fr

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    • 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 a gypsum board. More specifically, even when gypsum having a high content of water-soluble salts corresponding to impurities is used for preparing a slurry to be cured, the occurrence of bending can be sufficiently prevented. Related to gypsum board.
  • a gypsum board is generally loaded with a gypsum-containing slurry between a lower base paper that also serves as a formwork and an upper back base paper, and is continuously conveyed in this state while the slurry is cured and hardened in the meantime. Manufactured by cutting the body.
  • the gypsum-containing slurry is prepared by mixing various admixtures, chemicals, and required amounts of water in addition to calcined gypsum (half-water gypsum) obtained by firing raw gypsum.
  • various chemical gypsum such as phosphate gypsum, flue gas desulfurization gypsum, titanium gypsum (gypsum produced as a by-product in the production of titanium oxide), hydrofluoric acid gypsum (produced as a by-product in the production of hydrofluoric acid) Used), salt gypsum, refined gypsum and the like.
  • the gypsum board produced by such a conventional production method has a problem that when it absorbs moisture and the water content becomes high, the gypsum board tends to bend, and among them, the content of water-soluble salts corresponding to impurities is high as a raw material gypsum. There is a problem that the resulting gypsum board is greatly bent.
  • Patent Document 1 As a gypsum board that prevents the occurrence of bending, an example in which a crystal modifier such as copper sulfate is used in combination in a slurry to be cured (for example, see Patent Document 1), and an example in which an aggregated phosphate is used in combination (for example, Patent Document) 2) is known.
  • Patent Document 1 has a problem that the occurrence of bending cannot be sufficiently prevented, and the conventional example such as Patent Document 2 is expensive and causes environmental pollution. There is a problem that there is also a fear of becoming.
  • Patent Document 3 Another example of a gypsum board imparted with fire resistance and water resistance is also known in which cement is used in combination with a slurry to be cured (for example, see Patent Document 3).
  • a conventional example such as Patent Document 3 uses a large amount of cement, specifically about 20 to 40% cement, together with gypsum.
  • this conventional example has a problem that the strength of the gypsum board obtained, for example, the compressive strength is low, the slurry takes a long time to cure, and the pH is extremely high.
  • the problem to be solved by the present invention is that even when gypsum having a high content of water-soluble salts corresponding to impurities is used as a raw material, the occurrence of bending can be sufficiently prevented, and the compressive strength can be prevented.
  • the present invention provides a gypsum board that does not cause problems in curing time, pH, and the like.
  • the present invention which solves the above-mentioned problems is a gypsum board in which a mold is charged with a gypsum-containing slurry and cured, and 0.2 to 5.0 parts by mass of cement per 100 parts by mass of calcined gypsum obtained by firing gypsum.
  • the gypsum board is obtained by curing a slurry used at a ratio of
  • the gypsum board according to the present invention uses 0.2 to 5.0 parts by mass of cement per 100 parts by mass of calcined gypsum (semihydrate gypsum) obtained by firing gypsum, and requires various admixtures and chemicals.
  • the slurry is prepared by mixing them with water as appropriate, and the slurry is loaded between a form frame, for example, a front base paper also serving as a mold and a back base paper, and cured.
  • gypsum board in addition to natural gypsum, various chemical gypsum, such as phosphate gypsum, flue gas desulfurization gypsum, titanium gypsum, hydrofluoric gypsum, salt gypsum, refined gypsum, etc. Can do.
  • the content (concentration) of water-soluble salts corresponding to the impurities in the gypsum used for preparing the slurry varies depending on the type and amount of chemical gypsum used and the properties at that time.
  • Portland cement is preferable, and ordinary Portland cement is more preferable.
  • pulp, glass fiber, vermiculite and the like can be appropriately used as the admixture, and curing accelerators, curing retarders, water reducing agents and the like can be appropriately used as the chemicals.
  • the gypsum board according to the present invention is obtained by curing a slurry using 0.2 to 5.0 parts by mass of cement per 100 parts by mass of calcined gypsum obtained by firing gypsum, It is characterized in that the amount of cement used for calcined gypsum is significantly lower than conventional gypsum boards that use cement for the preparation of the slurry. The reason is that if the use ratio of cement is less than 0.2 parts by mass per 100 parts by mass of calcined gypsum, it will not be possible to sufficiently prevent the resulting gypsum board from being bent. Further, when the proportion of the cement used exceeds 5.0 parts by mass, the compressive strength of the resulting gypsum board decreases, the time required for curing increases, and the pH increases remarkably.
  • gypsum board made by hardening slurry using cement together with calcined gypsum the compressive strength is higher than when cement is not used, and the time required for hardening is relatively short, and the pH is also kept to a level where there is no problem.
  • the cement is used at a ratio of 0.5 to 1.0 parts by mass, more preferably at a ratio of 0.5 parts by weight.
  • the gypsum board according to the present invention can sufficiently prevent the occurrence of bending as compared with the conventional gypsum board as described above, and does not cause problems in compressive strength, curing time, pH and the like.
  • the manifestation of this effect is significant when the calcined gypsum used for the preparation of the slurry is a calcined gypsum having a high content of water-soluble salts corresponding to impurities.
  • the expression of the effect of the present invention as described above is that calcined gypsum used for the preparation of the slurry has a total content of water-soluble potassium salt, sodium salt and magnesium salt of those oxides (K 2 O, Na 2 O and MgO) in terms of 500 g / kg or more of gypsum, for example 500 to 2500 mg / kg of gypsum, which is remarkable when used as a raw material, and in particular, the total content of water-soluble potassium, sodium and magnesium salts Is particularly prominent when the oxide is 600 mg / kg or more in terms of oxides, for example, 600 to 2500 mg / kg.
  • cured material obtained.
  • Test category 1 Comparative Example 1 A flue gas desulfurization gypsum having a total content of water-soluble potassium salt, sodium salt and magnesium salt in terms of oxides of 632 mg / kg (hereinafter simply referred to as water-soluble salt content 632 mg / kg) is calcined, and calcined gypsum (Hemihydrate gypsum). A slurry was prepared by mixing 200 parts by mass of this calcined gypsum with 170 parts by mass of water. This slurry was loaded into a mold and cured, then demolded and dried at 40 ° C. until a constant weight was obtained to obtain a 12.5 mm ⁇ 900 mm ⁇ 1820 mm gypsum board.
  • a test piece of 12.5 mm x 150 mm x 650 mm was cut out from this gypsum board, and this test piece was supported at two points with a span of 600 mm under the condition of 40 ° C x 90% RH.
  • the bending at the center of the span was measured with a measuring instrument (a Digimatic indicator, trade name, manufactured by Mitutoyo Corporation). The results are summarized in Table 1.
  • Comparative Examples 2-4 Instead of 170 parts by mass of water, a slurry was prepared in the same manner as in Comparative Example 1 except that 170 parts by mass of an aqueous solution in which copper sulfate pentahydrate was added in the amount shown in Table 1 was used. After obtaining the gypsum board, the test piece was cut out and the deflection was measured. The results are summarized in Table 1.
  • Comparative Examples 5-7 In place of 170 parts by mass of water, a slurry was prepared in the same manner as in Comparative Example 1 except that 170 parts by mass of an aqueous solution in which an amount of sodium trimetaphosphate as shown in Table 1 was added was used. After obtaining, the test piece was cut out and the deflection was measured. The results are summarized in Table 1.
  • Comparative Examples 8-11 and Examples 1-7 In place of 200 parts by mass of calcined gypsum, a slurry was prepared in the same manner as in Comparative Example 1 except that 200 parts by mass of calcined gypsum mixed with ordinary Portland cement in the amount shown in Table 1 was used. After obtaining the gypsum board, the test piece was cut out and the deflection was measured. The results are summarized in Table 1.
  • Test category 2 Comparative Example 12 A flue gas desulfurization gypsum having a water-soluble salt content of 632 mg / kg was calcined to obtain calcined gypsum (half water gypsum). A slurry was prepared by mixing 375 g of water with 500 g of this calcined gypsum. This slurry was loaded into a 50 mm ⁇ 50 mm ⁇ 50 mm mold and cured, then demolded and dried at 40 ° C. until a constant weight was obtained, to obtain a cured product.
  • the cured body was subjected to autograph (manufactured by Shimadzu Corporation, trade name, model number AG-10TE), loaded at a load speed of 1 mm / min, and the load value when the cured body was buckled was determined as the compressive strength (N / mm 2 ).
  • the results are shown in Table 2 and FIG.
  • the compressive strength is about the same or higher, but if the added mass part of ordinary Portland cement is larger than that, for example, 10.0 or more, the compressive strength does not add ordinary Portland cement. It becomes lower than the case (Comparative Example 12). Also in terms of compressive strength, the added part by mass of ordinary Portland cement per 100 parts by mass of calcined gypsum is preferably 0.3 to 2.0.
  • Test category 3 Comparative Example 16 A flue gas desulfurization gypsum having a water-soluble salt content of 632 mg / kg was calcined to obtain calcined gypsum (half water gypsum). A slurry was prepared using this calcined gypsum, and the curing time (the amount of completion) was measured using this slurry in accordance with JIS-R9112. Further, the pH of the obtained cured product was measured according to JIS-R9101. The results are summarized in Table 3.
  • Example 15 and Comparative Examples 17-19 instead of calcined gypsum, a slurry was prepared in the same manner as in Comparative Example 16 except that a mixture of calcined gypsum mixed with ordinary Portland cement in an amount corresponding to the addition amount shown in Table 1 was used to obtain a cured product. The curing time (minute of completion) and pH were measured. The results are summarized in Table 3.
  • Test category 4 Comparative Example 20 A mixture of natural gypsum having a water-soluble salt content of 227 mg / kg and flue gas desulfurization gypsum was calcined to obtain calcined gypsum (half water gypsum). Using this calcined gypsum, a slurry was prepared and a gypsum board was obtained in the same manner as in Comparative Example 1 of Test Category 1 below, and then a test piece was cut out and the deflection after 48 hours was measured. The results are shown in Table 4 and FIG.
  • Comparative Examples 21-31 The source (kind) and mixing ratio of the flue gas desulfurization gypsum were changed, and the gypsum having the water-soluble salt content shown in Table 4 was baked to obtain calcined gypsum (half-water gypsum). Using these calcined gypsum, a slurry was prepared and a gypsum board was obtained in the same manner as in Comparative Example 20 below. Then, a test piece was cut out and the deflection after 48 hours was measured. The results are summarized in Table 4 and FIG.
  • Example 16 instead of calcined gypsum, a slurry was prepared and a gypsum board was obtained in the same manner as in Comparative Example 27 except that a mixture of ordinary Portland cements in the amount shown in Table 4 was used. A piece was cut out and the deflection after 48 hours was measured. The results are shown in Table 4 and FIG.
  • Example 17 instead of calcined gypsum, a slurry was prepared and a gypsum board was obtained in the same manner as in Comparative Example 30, except that a mixture of ordinary Portland cements in the amount shown in Table 4 was used. A piece was cut out and the deflection after 48 hours was measured. The results are shown in Table 4 and FIG.
  • Example 18 instead of calcined gypsum, a slurry was prepared and a gypsum board was obtained in the same manner as in Comparative Example 31 except that a mixture of ordinary Portland cements in the amounts shown in Table 4 was used. A piece was cut out and the deflection after 48 hours was measured. The results are shown in Table 4 and FIG.

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  • 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

La présente invention concerne une plaque de plâtre dont la courbure peut être suffisamment supprimée, même lorsqu'elle est produite en utilisant du plâtre de départ contenant une grande quantité de sels solubles dans l'eau comme impuretés. De plus, la plaque de plâtre est avantageuse en termes de résistance à la compression, de temps de durcissement, de pH, et ainsi de suite. L'invention concerne en outre une plaque de plâtre produite en remplissant un coffrage avec une laitance contenant du plâtre et à la durcir, la laitance contenant à la fois du plâtre calciné et de 0,2 à 5,0 parties en poids d'un ciment pour 100 parties en poids de plâtre calciné.
PCT/JP2009/068465 2009-10-28 2009-10-28 Plaque de plâtre WO2011052048A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
KR1020117030182A KR20120070543A (ko) 2009-10-28 2009-10-28 석고보드
JP2011538149A JPWO2011052048A1 (ja) 2009-10-28 2009-10-28 石膏ボード
CN200980162305XA CN102712535A (zh) 2009-10-28 2009-10-28 石膏板
PCT/JP2009/068465 WO2011052048A1 (fr) 2009-10-28 2009-10-28 Plaque de plâtre

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2009/068465 WO2011052048A1 (fr) 2009-10-28 2009-10-28 Plaque de plâtre

Publications (1)

Publication Number Publication Date
WO2011052048A1 true WO2011052048A1 (fr) 2011-05-05

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PCT/JP2009/068465 WO2011052048A1 (fr) 2009-10-28 2009-10-28 Plaque de plâtre

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JP (1) JPWO2011052048A1 (fr)
KR (1) KR20120070543A (fr)
CN (1) CN102712535A (fr)
WO (1) WO2011052048A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017190262A (ja) * 2016-04-14 2017-10-19 チヨダウーテ株式会社 石膏部材、石膏ボード及び石膏部材の製造方法
CN108290791A (zh) * 2015-11-30 2018-07-17 可耐福石膏两合公司 用于石膏建筑材料的添加剂
CN114349449A (zh) * 2021-11-23 2022-04-15 北新集团建材股份有限公司 一种纸面石膏板及其制备方法
US11891336B2 (en) 2019-11-22 2024-02-06 United States Gypsum Company Gypsum board containing high absorption paper and related methods
US11993054B2 (en) 2019-11-05 2024-05-28 United States Gypsum Company Method of preparing gypsum wallboard from high salt gypsum, and related product

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105328943B (zh) * 2014-08-15 2018-08-14 北新集团建材股份有限公司 一种提高资源能源利用效率的石膏板及其制造方法
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

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11116319A (ja) * 1997-10-07 1999-04-27 Yoshino Gypsum Co Ltd 重金属の溶出が抑制された石膏系建材及びその製造方法

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS582189B2 (ja) * 1979-11-16 1983-01-14 川崎重工業株式会社 石こう硬化体の白華防止法

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11116319A (ja) * 1997-10-07 1999-04-27 Yoshino Gypsum Co Ltd 重金属の溶出が抑制された石膏系建材及びその製造方法

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108290791A (zh) * 2015-11-30 2018-07-17 可耐福石膏两合公司 用于石膏建筑材料的添加剂
CN108290791B (zh) * 2015-11-30 2022-04-01 可耐福石膏两合公司 用于石膏建筑材料的添加剂
JP2017190262A (ja) * 2016-04-14 2017-10-19 チヨダウーテ株式会社 石膏部材、石膏ボード及び石膏部材の製造方法
US11993054B2 (en) 2019-11-05 2024-05-28 United States Gypsum Company Method of preparing gypsum wallboard from high salt gypsum, and related product
US11891336B2 (en) 2019-11-22 2024-02-06 United States Gypsum Company Gypsum board containing high absorption paper and related methods
CN114349449A (zh) * 2021-11-23 2022-04-15 北新集团建材股份有限公司 一种纸面石膏板及其制备方法

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Publication number Publication date
CN102712535A (zh) 2012-10-03
KR20120070543A (ko) 2012-06-29
JPWO2011052048A1 (ja) 2013-03-14

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