MY128172A - Foamed fireproofing composition and method - Google Patents

Abstract

DISCLOSED ARE FORMULATIONS ADAPTED TO FORM A FOAMED CEMENTITIOUS COMPOSITION, THE FOAMED CEMENTITIOUS COMPOSITION ITSELF, A METHOS OF FORMING A HYDRAULIC BINDER FOAM, AND A METHOD OF CONVEYING AND APPLYING THE RESULTING FOAM TO A SUBSTRATE. A PUMPABLE CEMENTITIOUS SLURRY IS FORMED, THE SLURRY IS MIXED WITH A GAS SUCH AS AIR, AND IS SUBJECTED TO MECHANICALLY CREATED TURBULENCE TO GENERATE GAS BUBBLES AND CREATE A FOAM, WHICH PREFERABLY IS STABILIZED BY A FOAM STABILIZING AGENT SUCH AS POLYVINYL ALCOHOL PRESENT IN THE SLURRY. THE FOAM IS THEN CONVEYED TO A NOZZLE OR OTHER SUITABLE DISPENSE POINT FROM WHICH IT IS APPLIED, FOR EXAMPLE SPRAYED, PREFERABLY UNIFORMLY, ONTO A SUBSTRATE TO BE COATED. PRIOR TO DISPENSING, A SET ACCELERATOR IS PREFERABLY INJECTED, WHICH CAUSES THE FOAM TO GEL, WHICH IN TURN IMPROVES THE HANGABILITY OF THE PRODUST ON A SUBSTRATE. THE SPRAY MATERIAL ADHERES TO THE SUBSTRATE AND HARDENS TO FORM AN ISULATIVE COATING ON THE SUBSTRATE. ALSO DISCLOSED ARE DRY COMPOSITIONS COMPRISING A HYDRATABLE CEMENTITIOUS BINDER, A MECHANICAL FOAM STABILIZING AGENT, AND OPTIONALLY A FIBROUS COMPONENT, SET RETERDER AND AIR ENTRAINING AGENT, SAID COMPOSITION PROVIDING, ON THE ADDITION OF WATER, GAS AND MECHANICAL TURBULENCE, A SETTABLE FOAM WHICH IS CAPABLE OF SPRAY APPLICATION TO A STEEL STRUCTURAL MEMBER AND WHICH, AFTER SPRAY APPLICATION, IS ADHERENT TO THE MEMBER IN THE FOAMED STATE AND AFTER SETTING. THE FOAM AFTER SETTING , FOAMS A FIRE AND HEAT PROTECTIVE ADHERENT COATING ON THE MEMBER.