Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1997-02-19
1999-08-03
Morgan, Kriellion S.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
528232, 524592, B22C 122
Patent
active
059326280
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a binder composition for the production of molds which is used to be added to a refractory granular material when a mold is produced, and a (binder/curing agent for the production of molds) composition comprising a binder composition for the production of molds and a curing agent composition. The present invention also relates to a sand composition for the production of molds which comprises a refractory granular material and the binder composition for the production of molds, or a sand composition for the production of molds which comprises a refractry granular material, the binder composition for the production of molds and the curing agent composition. The present invention further relates to a method for producing a mold by using the sand composition for the production of molds.
BACKGROUND ART
Conventionally, as a binder for foundry sand for the production of molds, an acid curing resin, such as a phenolic resin, a furan resin, and furfuryl alcohol, is used, and a method of producing a mold wherein these binders are cured by adding a curing agent thereto is usually carried out. A furan resin having good properties as an organic self-curing resin for foundry sand has long been used (Japanese Patent Publication No. 39-1543/1964, etc.), and such a furan resin has been improved in various ways to develop, depending on its application, for example, a binder which is weaken in odor by adding thereto glyoxal, tetraoxane or the like and a binder is lowered in cost by modifying it with a phenolic resin, a urea resin or the like.
However, there has recently been a demand for an improvement in working efficiency through improvements in machinery, facilities, processes, and the like for the production of castings and in association with it, as a binder for foundry sand, a self-curing organic binder of a quick curing type has been strongly desired. To meet the demand, for example, a method wherein the sand temperature is elevated in order to accelerate the curing of a binder, a method wherein water is removed under reduced pressure, and a method wherein use is made of a large quantity of a curing agent have been adopted.
However, for such a purpose, to elevate the temperature is economically disadvantageous because extra energy is required. Further to remove water under reduced pressure can accelerate the curing to a certain extent but cannot fundamentally solve the problem. Further the use of a large quantity of a curing agent can improve the curing speed to accelerate the curing, but results in such disadvantages that the working atmosphere is deteriorated by the decomposed gases and that the strength of castings was lowered.
In view of the above, as a curing agent composition that makes the working atmosphere difficultly deteriorated even if the curing agent composition is used in a relatively large quantity, one wherein a phosphoric acid compound and a sulfonic acid compound are mixed in a specified ratio is suggested (Japanese Patent Application Laid-Open No. 5-237587). That is, by mixing a phosphoric acid compound low in toxicity with a sulfonic acid compound capable of promoting curing in a specified ratio, it is intended to accelerate the curing speed and to prevent the working atmosphere from being deteriorated. Although such a curing agent composition was very useful, it is needless to say that if the usage was too much, the working atmosphere was deteriorated disadvantageously. Further the above official gazette does not describe at all the use of a furan resin together with a curing accelerator and the adjustment of the degree of polycondensation of that furan resin.
DISCLOSURE OF THE INVENTION
Therefore, an object of the present invention is to provide a binder composition for the production of molds which does not deteriorate the working atmosphere and whose curing is promoted.
Further, an object of the present invention is to provide a (binder/curing agent for the production of molds) composition comprising the binder composition for the product
REFERENCES:
patent: 4017461 (1977-04-01), Dunlop et al.
patent: 4634723 (1987-01-01), Gardziella et al.
patent: 4636537 (1987-01-01), Gruber et al.
patent: 5288774 (1994-02-01), Gardziella et al.
patent: 5616631 (1997-04-01), Kiuchi et al.
Database WPI, XP002050933, Section Ch, Week 8432, Derwent Publications Ltd., London, GB; Class A21, AN 84-198587.
Kato Masayuki
Kiuchi Kazuhiko
Nakai Shigeo
Sawa Masuo
Kao Corporation
Morgan Kriellion S.
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