| abstract |
The cement composition may include polyvinyl alcohol, high alumina cement, water, metal co-agents, peroxide cross-linking initiators, and organic acid flame retardants. The hydrogel prepolymer can be prepolymerized using a high shear mixing process by preparing a hydrogel prepolymer blend of saponified polyvinyl acetate (PVAA) and water having greater than or equal to about 85% saponified PVAA. The polymer blend was mixed with high alumina cement (HAC), mixed in metal co-agent and peroxide crosslinking initiator, mixed in organic acid flame retardant, and heated at about 5MPa pressure and about 90°C. The mixture was pressed for about 30 minutes to produce molded articles from the cement composition. |