An expandable aggregate mixture for a mold, which contains an aggregate, a water-soluble binder, a water-soluble foaming agent, water, and spherical metal oxide particles.

An expandable aggregate mixture for a mold, which contains an aggregate, a water-soluble binder, a water-soluble foaming agent, water, and spherical metal oxide particles.

An aggregate mixture for a mold, the aggregate mixture including an aggregate, a water-soluble binder, a water-soluble foaming agent, an aqueous mold release agent, and water.

A binder system for metal casting has a reactive furan resin, furfuryl alcohol, and a plasticizer that includes an epoxidized fatty acid. The reactive furan resin is a resin modified with phenolic resole, present at from about 18 wt. % to about 22 wt. %, based on the weight of the binder system. The plasticizer may include plant seed oil, such as soybean oil, linseed oil, rapeseed oil, cottonseed oil, sunflower oil and mixtures thereof, present at between about 4 wt. % to about 9 wt. %, based on the weight of the binder system. The furfuryl alcohol and the plasticizer are collectively present in an amount ranging from about 75 wt. % to about 85 wt. %, based on the weight of the binder system. Silane may also be present in an amount from about 0.1 wt. % to about 0.5 wt. %, based on the weight of the binder system.

A binder system for metal casting has a reactive furan resin, furfuryl alcohol, and a plasticizer that includes an epoxidized fatty acid. The reactive furan resin is a resin modified with phenolic resole, present at from about 18 wt. % to about 22 wt. %, based on the weight of the binder system. The plasticizer may include plant seed oil, such as soybean oil, linseed oil, rapeseed oil, cottonseed oil, sunflower oil and mixtures thereof, present at between about 4 wt. % to about 9 wt. %, based on the weight of the binder system. The furfuryl alcohol and the plasticizer are collectively present in an amount ranging from about 75 wt. % to about 85 wt. %, based on the weight of the binder system. Silane may also be present in an amount from about 0.1 wt. % to about 0.5 wt. %, based on the weight of the binder system.

The invention describes a process for obtaining clay having improved characteristics that comprises incorporating an inorganic matrix onto an organic matrix at determined proportions. The industrial clay obtained is malleable and highly resistant to compression and strain, of great use in the industry of prototype elaboration.

The invention relates to a mold material mixture for producing casting molds for metal processing, a process for producing casting molds, casting molds which can be obtained by the process and their use. The production of the casting molds is carried out using a refractory base molding material and a binder based on water glass. A proportion of a particulate metal oxide selected from the group consisting of silicon dioxide, aluminium oxide, titanium oxide and zinc oxide is added to the binder, with particular preference being given to using synthetic amorphous silicon dioxide. The mold material mixture contains a surface-active material as further significant constituent. The addition of the surface-active material enables the flowability of the mold material mixture to be improved, which makes it possible to produce casting molds having a very complicated geometry.

The invention relates to a mold material mixture for producing casting molds for metal processing, a process for producing casting molds, casting molds which can be obtained by the process and their use. The production of the casting molds is carried out using a refractory base molding material and a binder based on water glass. A proportion of a particulate metal oxide selected from the group consisting of silicon dioxide, aluminium oxide, titanium oxide and zinc oxide is added to the binder, with particular preference being given to using synthetic amorphous silicon dioxide. The mold material mixture contains a surface-active material as further significant constituent. The addition of the surface-active material enables the flowability of the mold material mixture to be improved, which makes it possible to produce casting molds having a very complicated geometry.