METHOD FOR WATER-REPELLENCY TREATMENT OF SURFACE OF GYPSUM ARTICLES Russian patent published in 1997 - IPC

FIELD: construction engineering. SUBSTANCE: this relates to creating water-repellent surface of gypsum articles and their easier unshuttering. According to method, forming surface of equipment is covered with lubricating compound containing industrial oil and fat of mineral origin, and also silicon-organic liquid, gypsum hardening accelerating agent and glue of natural or synthetic rubber with following content of components, mass %: fat of mineral origin 2-10, silicon-organic liquid 5-15, gypsum hardening accelerating agent 1-3, glue of natural or synthetic rubber 1-5, industrial oil - the balance. Used in function of fat of mineral origin is stearine or paraffin or petrolatum, in function of gypsum hardening accelerating agent is sodium sulfate or sodium chloride or potassium bisulfate or potassium chloride, in function of industrial oil - waste oil, in function of matter giving elastic property to surface layer of article - natural or synthetic rubber. EFFECT: high efficiency. 3 cl