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.

公开(公告)号：US20190352232A1

公开(公告)日：2019-11-21

申请号：US16401899

申请日：2019-05-02

Applicant: United States Gypsum Company

Inventor： Qinghua LI ,  Yijun SANG ,  Trevor S. RISCHE

IPC: C04B28/14 ,  C04B16/02 ,  C04B16/06 ,  B32B13/08 ,  B32B29/00 ,  B32B7/02

Abstract: Disclosed is a composite gypsum board comprising a board core and a concentrated layer, as well as related methods of preparing board and slurries. The board core and the concentrated layer both are formed from water and stucco. The concentrated layer is designed to have higher density and/or nail pull than the core. The concentrated layer is further formed from one or more of starch thickener, cellulose, and/or copolymer containing polyacrylamide and acrylic acid. In some embodiments, the concentrated layer is formed from an enhancing additive to enhance strength therein, while the core is formed without using enhancing additive or less enhancing additive than used in forming the board core.