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    COMPOSITIONS AND METHODS FOR TREATING SET GYPSUM
    42.
    发明公开
    COMPOSITIONS AND METHODS FOR TREATING SET GYPSUM 有权
    组合物和方法治疗组石膏

    公开(公告)号：EP1446369A1

    公开(公告)日：2004-08-18

    申请号：EP02789761.0

    申请日：2002-11-19

    Applicant: UNITED STATES GYPSUM COMPANY

    Inventor： YU, Qiang ,  LIU, Qingxia ,  GRUSSING, Jeffrey, F. ,  MOYER, Kevin, W. ,  SPENCER, Richard

    IPC: C04B41/67

    CPC classification number: C04B41/009 ,  C04B41/5015 ,  C04B41/67 ,  C04B41/4535 ,  C04B28/14

    Abstract: A composition and method for treating a set gypsum-containing material are disclosed. The composition is formed from at least water at least one trimetaphosphate salt, at least one monobasic phosphate salt, and at least one acyclic polyphosphate salt having at least three phosphate units. The method comprises applying to a set gypsum material at least two of the following inorganic phosphates: at least one monobasic phosphate salt, at least one trimetaphosphate salt, and at least one acyclic polyphosphate salt having at least three phosphate units. The method can be for inhibiting re-calcination of a set gypsum containing material, and/or for enhancing the strength, surface hardness, paintability, abrasion resistance, and/or water erosion resistance of a set gypsum-containing material. Also disclosed is a method of making a set gypsum-containing material.

    SET ACCELERATOR FOR GYPSUM HYDRATION
    48.
    发明公开
    SET ACCELERATOR FOR GYPSUM HYDRATION 有权
    AUSHÄRTUNGSBESCHLEUNIGERFÜRGIPSHYDRIERUNG

    公开(公告)号：EP2655290A1

    公开(公告)日：2013-10-30

    申请号：EP11806040.9

    申请日：2011-12-09

    Applicant: United States Gypsum Company

    Inventor： VEERAMASUNENI, Srinivas ,  YU, Qiang

    IPC: C04B28/14

    CPC classification number: C04B28/145 ,  C04B2103/12 ,  C04B22/16

    Abstract: In a first embodiment of the invention, aged brushite is combined with calcium sulfate hemihydrate and water to make a gypsum slurry. Aged brushite slurry behaves similarly to calcium sulfate dihydrate to act as a seed crystal and rapidly initiate crystallization. The brushite slurry does not require the addition of a coating to maintain its activity over time compared to calcium sulfate dihydrate set accelerators. A gypsum-based product made using brushite slurry as the set accelerator is a second embodiment. The product has the brushite molecules integrated as part of the calcium sulfate dihydrate matrix and is distributed throughout the matrix.

    Abstract translation: 在本发明的第一个实施方案中，将老化的钙石与硫酸钙半水合物和水混合以制备石膏浆料。 老化的水泥浆浆料与硫酸钙二水合物的作用类似，用作晶种，并迅速引发结晶。 与硫酸钙二水合物凝胶加速剂相比，刷石浆料不需要添加涂层以保持其随时间的活性。 使用石灰浆作为凝固加速剂制成的石膏基产品是第二实施方案。 该产品具有整合作为硫酸钙二水合物基质的一部分的分散在整个基质中的挥发分子。

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