| 摘要 |
PROBLEM TO BE SOLVED: To obtain the function of a coating film to absorb expansion of magnesia carbon brick with a relatively this coating film, by applying a specified urethane resin emulsion coating material on the surface of the brick. SOLUTION: This urethane resin emulsion coating material is prepared by compounding a urethane resin emulsion as the main component and an org. granular material which completely combusts when exposed to air at high temp. The urethane resin emulsion coating material is applied to form a coating film having <=0.8mm thickness on the surface of magnesia carbon brick to obtain refractory brick. The surface of the coating film of the obtd. refractory brick is rough and has an enough effect to prevent slipping in the process for production or building a furnace so that safeness of work can be improved. Since the org. granular material is removed by combustion during heating, the coating film can largely be shrunk in its film thickness. Thus, the thin film gives a high expansion-absorbing function. |
