公开(公告)号：US4126599A

公开(公告)日：1978-11-21

申请号：US770432

申请日：1977-02-22

申请人： Yujiro Sugahara ,  Hiroyuki Naito ,  Tokio Okubo ,  Nobuo Omori

发明人： Yujiro Sugahara ,  Hiroyuki Naito ,  Tokio Okubo ,  Nobuo Omori

IPC分类号： C04B28/14 ,  C04B41/45 ,  C08K3/00

CPC分类号： C04B41/009 ,  C04B28/14 ,  C04B41/45

摘要： A water-resistant shaped structure of gypsum comprising (A) calcium sulfate dihydrate formed by hardening of calcium sulfate capable of hydration reaction, (B) a calcium type filler for filling up spaces among crystalline particles of said calcium sulfate dihydrate and (C) a water-insoluble or hardly water-soluble salt of a polybasic acid having a second stage dissociation constant of 10.sup.-3 to 10.sup.-10, especially 10.sup.-4 to 10.sup.-9, as measured at 25.degree. C., said calcium type filler (B) being at least one calcium compound selected from the group consisting of calcium hydroxide, calcium carbonate, calcium silicate, calcium aluminosilicate, and non-water-hardenable anhydrous gypsum and partially hydrated products thereof, wherein the amount of the calcium type filler (B) and the water-insoluble or hardly water-soluble calcium salt (C) is 15 to 75% based on the total amount of the components (A), (B) and (C) as calculated as calcium, the amount of the water-insoluble or hardly water-soluble calcium salt (C) is 0.1 to 30% based on the total amount of the components (A), (B) and (C) as calculated as calcium, the water-insoluble or hardly water-soluble calcium salt (C) is distributed predominantly in the surface portion of the shaped structure, and said surface portion has a pore volume smaller than 0.50 ml/g in pores having a radius in the range of 75 to 75000 A and a pore volume smaller than 0.20 ml/g in pores having a radius in the range of 4000 to 10000 A.

摘要翻译： 一种石膏的防水结构，包括（A）通过硬化能够水合反应的硫酸钙形成的硫酸钙二水合物，（B）用于在所述硫酸钙二水合物的结晶颗粒之间填充空间的钙型填料和（C） 在25℃下测定的第二阶段解离常数为10-3-10-10，特别是10-4-10-9的多元酸的水不溶性或难溶于水的盐，所述钙型填料（ B）是选自氢氧化钙，碳酸钙，硅酸钙，硅铝酸钙和非水可硬化无水石膏中的至少一种钙化合物及其部分水合产物，其中钙型填料（B ），水不溶性或难溶于水的钙盐（C）的含量相对于钙计算的成分（A），（B）和（C）的总量为15〜75％ 不溶或几乎不溶于水的calciu m盐（C）的含量相对于钙计算的成分（A），（B）和（C）的总量为0.1〜30％，水不溶性或难溶于水的钙盐（C）分布 主要在成形结构的表面部分中，并且所述表面部分的孔体积小于0.50ml / g，孔径为75至75000A，孔体积小于0.20ml / g。 范围在4000到10000之间的半径。