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    SILOXANE POLYMERIZATION IN GYPSUM WALLBOARD
    3.
    发明申请
    SILOXANE POLYMERIZATION IN GYPSUM WALLBOARD 审中-公开

    公开(公告)号：US20200024191A1

    公开(公告)日：2020-01-23

    申请号：US16401658

    申请日：2019-05-02

    Applicant: UNITED STATES GYPSUM COMPANY

    Inventor： Qinghua LI ,  Mark K. HEMPHILL ,  Trevor S. RISCHE

    IPC: C04B11/00 ,  C04B26/10 ,  C08L83/04 ,  C08K5/17 ,  B01J21/10

    Abstract: A method of making a gypsum board including: preparing an aqueous slurry including a mixture of: calcium sulfate hemihydrate, water at a weight ratio of water to calcium sulfate hemihydrate of 0.2:1 to 1.2:1, and on a dry basis per 100 parts by weight (pbw) calcium sulfate hemihydrate: 0.2 to 2 pbw siloxane, 0.01 to 2 pbw siloxane polymerization catalyst including magnesium oxide and optionally fly ash, and 0.01 to 0.2 pbw triethanolamine (TEOA); allowing the siloxane to polymerize to polysiloxane; and depositing the slurry on a first cover sheet and covering the slurry with a second cover sheet to shape the slurry, and allowing the shaped slurry to set to form the gypsum board. Also, disclosed is the gypsum board resulting from the method.

    BOARD WITH FIBER-REINFORCED DENSE LAYER
    6.
    发明申请
    BOARD WITH FIBER-REINFORCED DENSE LAYER 有权

    公开(公告)号：US20230021340A1

    公开(公告)日：2023-01-26

    申请号：US17855732

    申请日：2022-06-30

    Applicant: United States Gypsum Company

    Inventor： Annamaria VILINSKA ,  Mark K. HEMPHILL ,  Yijun SANG ,  Nicholas S. JONES ,  Kevern O. FRASER ,  Jon CROSS ,  Te Hua LAU

    IPC: C04B40/00 ,  C04B28/14 ,  B28C5/02 ,  B28B19/00 ,  B28C5/40

    Abstract: Disclosed is a composite gypsum board comprising a set gypsum core disposed between face (e.g., Manila) and back (e.g., Newsline) cover sheets. The set gypsum core is formed from a core slurry comprising stucco, water, and optional additives, such as foaming agent, migrating starch, accelerator, retarder, dispersant, etc. A dense layer formed from a dense layer slurry comprising stucco, water, fiber (e.g., paper fiber), and optionally, strength-enhancing starch, is disposed between the core and the face paper. The dense layer slurry contains a greater concentration of fiber, and optionally, strength-enhancing starch, than the core slurry, but the concentration of one or more other additives (e.g., accelerator, retarder, dispersant, or combinations thereof) is lower or the same in the dense slurry as compared with the core slurry. Also disclosed is a method of making board using one board mixer. In embodiments, paper fiber is added to water to form a suspension. The suspension is introduced, while in a non-laminar state, into the dense slurry. Further disclosed is apparatus, such as an extractor and an additive injection system, which can be a part of a cementitious slurry mixing and dispensing assembly.

    FIRE RESISTANT GYPSUM BOARD AND RELATED METHODS
    7.
    发明申请
    FIRE RESISTANT GYPSUM BOARD AND RELATED METHODS 有权

    公开(公告)号：US20210238096A1

    公开(公告)日：2021-08-05

    申请号：US17156258

    申请日：2021-01-22

    Applicant: United States Gypsum Company

    Inventor： Qinghua LI ,  Mark K. HEMPHILL ,  Naveen PUNATI

    IPC: C04B28/14 ,  C04B14/20 ,  B28B1/00 ,  B28B19/00

    Abstract: Disclosed are a composite gypsum board and a method of preparing composite gypsum board. The board contains a set gypsum core sandwiched between two cover sheets. The core is formed from a slurry containing stucco, water, and optional ingredients such as foaming agent, accelerator, retarder, polyphosphate, starch, and dispersant, and core intumescent material. The board also contains at least one skim coat and/or hard edges. A face skim coat layer can be included on one side of the core, facing a face cover sheet. A back skim coat layer can be included on the other side of the core, facing a back cover sheet. Hard edges are known in the art and can be formed, e.g., continuously from a stucco slurry for forming the face and/or back skim coats. Preferably, the back skim coat layer and/or the hard edges are formed from a slurry containing stucco, water, skim coat or edge intumescent material (which have the same desired characteristics), and other optional additives as desired. The skim coat or edge intumescent material can be composed of the same material as the core intumescent material, if desired, but the skim coat and/or edge intumescent material is present in a higher relative concentration in its respective slurry than the amount of core intumescent material in the core slurry. Examples of suitable intumescent materials include expandable vermiculite (e.g., No. 4 or No. 5 according to the US naming system, or combinations thereof), expandable graphite, perlite, or any combination thereof.

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