Method of manufacturing a bonded particulate article by reacting a hydrolyzed amylaceous product and a heterocyclic compound
First Claim
1. 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.
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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.
111 Citations
26 Claims
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1. 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. - View Dependent Claims (2, 3, 4)
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5. 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.
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6. 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. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A method of manufacturing a formed article comprising:
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(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. - View Dependent Claims (13)
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14. A method of manufacturing a resinlike material suitable for formed articles with the binder produced by the following steps:
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(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. - View Dependent Claims (15, 16)
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17. 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 - View Dependent Claims (19, 21, 22, 23, 24, 25, 26)
- 18. (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.
Specification