Mold binder material
US4278581A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 26, 1978 |
| Grant date | Jul 14, 1981 |
| Priority date | — |
| Expiry date | Sep 26, 1998 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22C1/162
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
In a mold to be hardened by a CO.sub.2 gas, a mold binder material comprising a combination of polymers containing carboxyl groups, at least one of multi-valent metal oxides and multi-valent metal hydroxides, and resins of polyvinyl alcohol group, and at least one of sodium salt of gluconic acid and polyhydric alcohols or a mold binder material comprising a combination of polymers having carboxyl groups, at least one of multi-valent metal oxides and multi-valent metal hydroxides, and at least one of sodium salt of gluconic acid and polyhydric alcohols is provided. By use of the present binder material, the following various effects can be obtained: (1) easy preparation of mold sand, (2) easy removal of the binder material by water washing even if bodies or clothes are fouled by the binder material, (3) a longer working time of mold sands, (4) a higher mold strength, (5) an improved working atmosphere at shaping of the mold, (6) an improved production efficiency of molds, (7) the desired mold strength being obtained with a smaller amount of CO.sub.2 gas used, etc.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.