公开(公告)号：US10968624B2

公开(公告)日：2021-04-06

申请号：US16060091

申请日：2016-12-05

申请人： YOSHINO GYPSUM CO., LTD.

发明人： Katsumi Niimi ,  Itaru Yokoyama ,  Kazuyuki Umehara ,  Yuji Ataka ,  Keiichi Ohki ,  Shinji Yoshida ,  Saburou Yamato ,  Tadashi Nakagaki ,  Ayaka Taniguchi

IPC分类号： E04C2/00 ,  E04B1/72 ,  C04B24/12 ,  C04B28/14 ,  B28B19/00 ,  A01N25/34 ,  C04B35/626 ,  C04B111/00

摘要： A gypsum panel includes a gypsum core containing a termiticide with poor water solubility, wherein the gypsum core has a first end region, a center region, and a second end region having an equal thickness and extending along a thickness direction from one surface side to another surface side, the termiticide is contained in each of the first end region, the center region, and the second end region, and a content of the termiticide in the center region is lower than a content of the termiticide in the first end region and in the second end region.

公开(公告)号：US10654754B2

公开(公告)日：2020-05-19

申请号：US15772369

申请日：2016-12-07

申请人： YOSHINO GYPSUM CO., LTD.

发明人： Itaru Yokoyama ,  Yoshikazu Tanaka

IPC分类号： C04B28/14 ,  C04B40/06 ,  E04F13/02 ,  C04B24/06 ,  C04B24/10 ,  C04B24/14 ,  C04B24/38 ,  C04B14/28 ,  C04B41/65 ,  C04B24/12 ,  C04B111/00 ,  C04B103/22 ,  C04B111/34

摘要： There is provided a gypsum composition for a drying type coating material, the gypsum composition, when made into a gypsum-based coating material by addition of water, capable of forming a coating film in which color unevenness is suppressed even though the coating film is thin and smooth. This gypsum composition for a drying type coating material contains hemihydrate gypsum having a mean particle diameter of 50 μm or less, calcium carbonate having a mean particle diameter of 50 μm or less, and a setting retarder, wherein the gypsum composition has a content of calcium carbonate of 100 to 400 parts by mass and a content of the setting retarder of 0.1 parts by mass or more each based on 100 parts by mass of the hemihydrate gypsum.

公开(公告)号：US09458025B2

公开(公告)日：2016-10-04

申请号：US13962601

申请日：2013-08-08

申请人： YOSHINO GYPSUM CO., LTD.

发明人： Itaru Yokoyama ,  Kouji Katsumoto ,  Yasuo Kawamura

IPC分类号： C01F11/46 ,  C04B11/00

CPC分类号： C01F11/46 ,  C01F11/466 ,  C01P2004/03 ,  C01P2004/61 ,  C01P2006/11 ,  C04B11/007 ,  Y10T428/2982

摘要： A process for the continuous modification of dihydrate gypsum includes calcining dihydrate gypsum into hemihydrate gypsum and recrystallizing the hemihydrate gypsum in an aqueous slurry to convert the hemihydrate gypsum into modified dihydrate gypsum of different crystalline form. The aqueous slurry in a recrystallization reaction tank is maintained at a constant temperature under stirring, and a feed rate of the hemihydrate gypsum to the recrystallization reaction tank and a discharge rate of the recrystallized dihydrate gypsum are controlled to substantially equal. Dihydrate gypsum as a starting raw material can be converted into high-purity, modified dihydrate gypsum of large crystals by recrystallizing the starting dihydrate gypsum after it is once calcined into hemihydrate gypsum.

摘要翻译： 二水石膏的连续改性方法包括将二水石膏煅烧成半水石膏，并将水泥浆中的半水石膏重结晶，将半石膏转化为不同结晶形式的改性二水石膏。 将重结晶反应槽中的含水浆料在搅拌下保持在恒定温度，并将半水石膏与再结晶反应槽的进料速率和再结晶二水合石膏的排出速率控制在大致相等。 作为起始原料的二水石膏可以在将其一次煅烧成半水石膏之后，将起始二水石膏重结晶，将其转化为大晶体的高纯度，改性二水石膏。