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Manufacture of alpha-type hemihydrate gypsum

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专利汇可以提供Manufacture of alpha-type hemihydrate gypsum专利检索,专利查询,专利分析的服务。并且PURPOSE: To obtain α-type hemihydrate gypsum causing no lowering in strength and no efflorescence phenomenon by adding a habit modifier, sodium chloride, calcium chloride and a needlelike hemihydrate gypsum seed to a gypsum slurry followed by heating under atmospheric press.
CONSTITUTION: To a gypsum slurry contg. an adequate amt. of a habit modifier are added 2W3 parts by wt. of sodium chloride and 10W18 parts of calcium chloride to 100 parts of water in the slurry. Needlelike himihydrate gypsum of 1W2μ minor axis and 10W30μ major axis is further added as a seed in an amt. of 0.3W1 part to 100 parts of gypsum. The slurry is then heated at the transition temp.Wthe b.p. under atmospheric press. to obtain prismatic or platelike α-type hemihydrate gypsum. The seed may be added in the form of a slurry or powder, yet it is pref. added when the temp. of the gypsum slurry reaches the transition temp.
COPYRIGHT: (C)1980,JPO&Japio,下面是Manufacture of alpha-type hemihydrate gypsum专利的具体信息内容。

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