Expanding gypsum casting powder and its paste-making method by using water


Application Number: 00119619
Application Date: 2000.08.17
Publication Number: 1281831
Publication Date: 2001.01.31
Priority Information:
International: B22C1/18
Applicant(s) Name: Shanghai Jiaotong Univ.
Address:
Inventor(s) Name: Li Zide;Chen Meiyi
Patent Agency Code: 31201
Patent Agent: wang tilin
Abstract The present invention relates to an expansive gypsum casting powder and method for preparing gypsum paste by mixing with water. The composition of said gypsum casting powder is formed from (wt%) alpha gypsum powder 28%-38%, cristobalite powder 0-29%, silica flour 20%-70%, additive A 0.3-0.8%, additive B 0.8%-1.2% and additive C 0.9%-1.1%, in which the additive A is a kind of organic macromolecular material, for example hydroxyethyl cellulose, modified dextrin and polyvinyl alcohol, the additive B is a kind of inorganic material, for example various silicates, aluminium silicate and calcium aluminate, etc., and the additive C is a gelatination time control agent.