Method of manufacturing a bonded particulate article by reacting a hydrolyzed amylaceous product and a heterocyclic compound
AssigneeAmerican Cyanamid Company
InventorsAlbert P. Paul, Richard A. Szarz, Roger J. Card
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Abstract
Disclosed herein is a method of manufacturing a bonded particulate article by admixing particulate material with a binder system, the binder system being formed by admixing a polyol comprising a water soluble amylaceous hydrolyzate with a heterocyclic compound comprising the reaction product of glyoxal, urea, and formaldehyde, alone, or in further combination with ethylene glycol, with a solvent, and with an acid effective to control the rate of cross-linking between said polyol and said heterocyclic compound; forming the admixture in a shape and curing the shape to a bonded article.
Claims25
A method of manufacturing a bonded particulate article comprising the steps of
- (i) admixing particulate material with a binder system, the binder system being formed by admixing a polyol comprising a hydrolyzed, gelatinized amylaceous material, a crosslinker for said polyol (ii) comprising the reaction product of gloxal, urea and formaldehyde, alone, or in further combination with ethylene glycol, a solvent, and an acid wherein said reaction is carried out at a pH of below about 7;
- (ii) forming the admixture into a shape;
- and
- (iii) curing to produce the bonded article.
A method of manufacturing a bonded particulate article comprising the steps of
- (i) admixing sand with a binder system, the binder system being formed by admixing a polyol comprising a hydrolyzed, gelatinized amylaceous material, a crosslinker for said polyol (ii) comprising the reaction product of glyoxal, urea and formaldehyde, alone or in further combination with ethylene glycol, water, and an acid;
- (ii) forming the admixture into a shape;
- and
- (iii) curing to produce the bonded article.
A method of manufacturing a bonded particulate article comprising the steps of
- (i) admixing sand with a binder system wherein the latter is formed by admixing a hydrolyzed, gelatinized amylaceous saccharide-containing material with a crosslinker for said saccharide containing material comprising the reaction product of glyoxal, urea and formaldehyde, alone, or in combination with ethylene glycol, water, and an acid;
- (ii) forming the article in a mold;
- and
- (iii) desolventizing the article.
A method of manufacturing a formed article comprising:
- (a) dispersing fillers, extenders and pigments in a hydrolyzed, gelatinized amylaceous material in an amount up to 80% and adding water to the mixture;
- (b) adding a mixture of a heterocyclic crosslinking compound of the formulae ##STR7## or a mixture of such compounds, and water wherein said compound or compounds are the reaction products of a reaction carried out at a pH of below about 7;
- (c) controlling the rate of the crosslinking reaction between the hydrolyzed, gelatinized amylaceous material and said heterocyclic compound by the use of an acid;
- (d) forming the mixture into a shape;
- and
- (e) causing the mixture to cure by the application of heat.
A method of manufacturing a resinlike material suitable for formed articles with the binder produced by the following steps:
- (a) crosslinking a hydrolyzed, gelatinized material with a heterocyclic compound of the formula ##STR8## or a mixture of such compouns in water wherein said compound or compounds are the reaction products of a reaction carried out at a pH of below about 7;
- (b) controlling the rate of the crosslinking reaction between the hydrolyzed gelatinized amylaceous material and said heterocyclic compound by the use of an acid salt;
- and said method including the following steps;
- (c) dissolving or dispersing the acid, hydrolyzed, gelatizinzed amylacous material and said heterocyclic compound in water;
- and
- (d) causing the mixture to react by the application of heat.
A method of manufacturing a foundry core comprising mixing sand and heat-accelerated curable binder system wherein the binder system is produced by the following steps, the percentages being a percent of sand:
- (a) crosslinking about 1-3% of a hydrolyzed, gelatinized amylaceous material with about 0.1-3% of a crosslinker comprising a heterocyclic compound of the formula ##STR9## in about a 40 to 60% aqueous solution;
- and
- (b) controlling the rate of reaction by the use of 0.3-1.0% of an acid as a catalyst, said mixture also comprising 0-10% clay, 0-10% silica flour, 0-10% iron oxide, and an effective amount of a release agent selected from the group comprising wax, wax emulsion, asphalt emulsion, and wax-asphalt emulsion.
Dependencies are inferred from the claim text.