摘要:
Hardenable foam compositions comprising oxygen-releasing foaming agents, a hardener consisting of an alkali silicate solution, a fine particle solid material which reacts with said hardener, namely an oxide mixture consisting of SiO.sub.2 and Al.sub.2 O.sub.3 extracted from a filter dust, an electrofilter ash from high-temperature power plants, and calcinated bauxite or amorphous silica, to which reaction accelerators are added, are improved, firmer, faster hardening foams. Reducing agents, in particular sulphur compounds with a reducing action are preferred. Oxidizing agents or fine particle substances such as soot or color pigments are effective.
摘要翻译:包含脱氧发泡剂的硬化泡沫组合物,由碱金属硅酸盐溶液组成的固化剂,与所述固化剂反应的细颗粒固体材料,即由过滤灰尘提取的由SiO 2和Al 2 O 3组成的氧化物混合物,来自高温的电过滤灰 温度发电厂和加入反应促进剂的煅烧铝土矿或无定形二氧化硅得到改进,更坚固,更快的硬化泡沫。 还原剂,特别是具有还原作用的硫化合物是优选的。 氧化剂或微粒物质如烟灰或彩色颜料是有效的。
摘要:
The present invention is directed to a process for strengthening geological formations in underground mining or other operations introducing into the formation which is to be strengthened mixtures of a polyisocyanate component (a) and a polyol component (b) which react together to form polyurethanes, characterized in that the polyol component (b) is based on mixtures of (i) organic polyhydroxyl compounds having hydroxyl numbers of about 100 to 600 and (ii) dihydric alcohols having a molecular weight of 62 to about 150, component (ii) being present in an amount of about 0.01 to 20% by weight, based on the total quantity of component (b).