Macro defect free cement with improved moisture resistance
AssigneeCaterpillar Inc.
InventorAaron K. Amstutz
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Abstract
A cementitious composition may include polyvinyl alcohol, high alumina cement, water, a metallic coagent, a peroxide crosslinking initiator, and an organic acid retardant. A molded article may be manufactured from the cementitious composition by preparing a hydrogel pre-polymer blend of saponified polyvinyl alcohol acetate (PVAA) with greater than or equal to approximately 85% saponified PVAA, and water, mixing the hydrogel pre-polymer blend with high alumina cement (HAC) using a high shear mixing process, mixing in a metallic coagent and a peroxide crosslinking initiator, mixing in an organic acid retardant, and hot press molding the mixture.
Claims4
A method of manufacturing a molded article made from a MDF cementitious composition, the method comprising:
- preparing a hydrogel pre-polymer blend of saponified polyvinyl alcohol acetate (PVAA) with greater than or equal to about 85 % saponified PVAA, and water;
- mixing the hydrogel pre-polymer blend with high alumina cement (HAC) using a high shear mixing process;
- mixing in a metallic coagent and a peroxide crosslinking initiator, wherein the metallic coagent is selected from the group comprising:
- zinc diacrylate (ZDA), zinc monoacrylate (ZMA), zinc dimethacrylate (ZDMA), calcium diacrylate (CDA), aluminum triacrylate, and magnesium diacrylate;
- mixing in an organic acid retardant selected from the group comprising:
- acetic acid, citric acid, tartartic acid, succinic acid, and polymeric acids;
- and
- hot press molding the mixture.
Dependencies are inferred from the claim text.