JPS59227943A - Curable mold composition - Google Patents

Abstract

PURPOSE:To provide the titled compsn. which can form a mold having an excellent strength by kneading, molding and introducing sulfur dioxide into the molding to cure it, consisting of an oxidizing agent obtd. by combining specified peroxides, a refractory aggregate and an acid-setting resin. CONSTITUTION:A mixture of 90-10pts.wt. arom. hydroperoxide of formula I (wherein R is H, methyl or a group of formula II) such as diisopropylbenzene hydroperoxide or alicyclic hydroperoxide of formula III such as menthane hydroperoxide and 10-90pts.wt. aliph. hydroperoxide of formula IV (wherein R is H or a group of formula II) such as tert-butyl hydroperoxide, is used as an oxidizing agent. 0.4-3pts.wt. acid-setting resin such as furan resin and 0.01-0.3pts.wt. said oxidizing agent are mixed with 100pts.wt. refractory aggregate such as Flattery sand.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an improved curable mold composition.

There is a cold box method as a method of hardening foundry sand in a foundry. 6i of acid curing resin with acid in cold box method! : In order to shorten the curing time during curing and increase the workability of the curing reaction, kneaded sand mixed with acid-curing resin and cutting agent is poured into the mold into the mold, and then hardened by passing through sulfur dioxide. There is a way to force it. In this method, RF yellow dioxide is oxidized by an oxidizing agent and 6
The acid-curing resin starts the curing reaction with a strong catalyst,
This is a method in which the curing reaction progresses and s17 types are formed in j, i, and +l types. The oxidizing agent used in this method, along with the acid-curing resin, has a great effect on the strength of the mold and the quality of the cast product after pouring. Generally, oxidizing agents include methyl ethyl ketone peroxide, aliphatic ketone peroxide, etc. , aromatic hydroperoxides such as diisopropylbenzene hydroloberoxide, or aliphatic hydroperoxides such as diisopropylbenzene hydroperoxide, etc., have been used alone.

Here, as a result of intensive research on various organic peroxides as oxidizing agents, the authors found that at least one of aromatic hydroperoxides or alicyclic hydroperoxides of /i The mold strength is greater than using aliphatic hydroperoxide, aromatic hydroperoxide, or alicyclic hydroperoxide alone. It was found that this was a dramatic improvement, and the present invention was completed.

That is, the present invention is a composition that is made of a synthetic aggregate, an acid-curing resin, and an oxidizing agent, and is cured by blowing sulfur oxide into a mixed wire molding mold. Tribe No.
Hydropermoxide or OR.

and at least one alicyclic noid robber 4th side represented by OJl,, CH.

The present invention provides a curable molding composition characterized in that it is a mixture with an aliphatic hydrocarbon compound represented by・The blending ratio of hydroper oxide or alicyclic hydrocarbon oxide and aliphatic hydrocarbon oxide is M
The ratio of f; to 90 to 10 is preferably 10 to 90.

Furthermore, tertiary pugyl hydropermoxide as an aliphatic hydropermexide is added in an oxidizing agent at
In the ratio of weight % (Jll, fE is better to use in combination. Also, i'1.!, the amount of compounding agent is fire resistance/fabric weight 10
It is preferable to use 0.01 to 0.3 parts by weight of active V to 0 parts by weight, but 1i14. It is not determined.

Examples of acid-curable resins used in the present invention include urine-formaldehyde resin, phenol-formaldehyde resin, and furan resin. Modified resins containing as a main component are preferably used.Also, the amount of acid-curable resin is 0.000 parts by weight per 100 parts by weight of Wr[personnel/1°1/month].
4 to 5.0 parts is preferable, but it is not limited to 19) depending on these acid-curable resins and their blending amounts.

By using the oxidizing agent according to the present invention, mold strength is increased. Therefore, it becomes easy to mold complex cores and thin cores. Furthermore, when the strength of the conventional mold is sufficient, the use of the oxidizing agent of the present invention makes it possible to reduce the amount of oxidizing agent added, which provides a cost advantage.

The standard structural formula of the peroxide used as an oxidizing agent in the present invention is shown below. It goes without saying that these commercially available peroxides contain more oxidized compounds and unreacted substances. In the present invention, such industrial products are usually used as peroxides.

Further, in order to explain the present invention in detail, Examples are described below, but the scope of the present invention is not limited by the Examples.
Not good.

Example 1 Arataly Sand 100'@Stone tX1< was put in a mixer, 1.2 parts by weight of furan resin was added and thoroughly kneaded for 45 seconds, and then an oxidizing agent (70 parts by weight of diisopropylbenzene hydroperoxide and tertiary resin) was added. A mixture of 30 parts of Lieptyl Hydrover Oxide) was added in an amount of 0.06 parts of active oxygen and blended for 45 seconds. Got h
The first step is to mold the sand mixture into a cylindrical shape between 5 o and φ x 50, and form it into a gaseous or aerosol-like mixture. 1! After curing through sulfuric acid, the mold was demolded and a test piece was made. After curing, 2
After standing for 4 hours, the drag pressure was measured using a Joke-Fischer drag pressure test YJA machine. The same activity "IW
Measurements were made in the same manner using 7 atomic amounts. The results are as shown in Table-1.

Table-1 Example 2 Kneading l', % Add 100 parts of K-aratari sand.

1.21 ('f1: parts) of furan-based resin was added and kneaded for 45 seconds, and then fffh'4 additives (50 parts by weight of menthane hydroperoxide and 50 parts by weight of Tahno-Yaripuglu hydroperoxide) were added and kneaded for 45 seconds. 0.04 parts by weight of active oxygen was added and kneaded for <45 seconds.

The obtained molding sand mixture was molded into a cylindrical shape of sommφX 50 MIN, and after hardening by passing gaseous or V or aerosol sulfur dioxide, the mold was demolded to prepare a test piece. After curing, it was left to stand for 24 hours and the resistance pressure was measured using a Joke Fischer resistance pressure tester. -C was measured in the same manner using the same amount of active oxygen for each of China and Germany using menthane hydroperoxide (Comparative Example-3) and tertiary-butyl hydroperoxide (Comparative Example-4) as v additives. The results are as shown in il, Q-2.

Table 2 Example 3 Put 100 parts by weight of Flatarisand into a mixer, add 1.2 parts by weight of furan-based I-41 fat and knead it outside for 45 seconds. Add 0.06'fIj parts of bilbenzene (a mixture of 70 parts by weight of tertiary butyl hydropermex) and 70 parts by weight of tertiary butyl hydropermecate to give the same 45% The obtained foundry sand mixture was kneaded for 5 seconds.
It was molded into a cylindrical shape of 0 x 50 mm, cured with 1ill of gaseous or aerosol carbon dioxide, and then removed from the mold to make a desto bead. After being left for 24 hours after curing, the resistance pressure was measured using a JOSHIFISHER resistance pressure test phase. As an oxidizing agent, diisopropylbenzene hydroveroxa ide (Comparative Example 5) and tertiary leaf thiol hydroxide (Comparative Example 6) were used alone at °C to give the same hostility* @K : Measurements were made in the same manner.The results are shown in Table 3.

Table-3 Example 4 Aratari sand 100 weight 111 on the crosstalk machine? 'ill, add furan-based resin to 1°2 mold break, mix outside for 45 seconds, then oxidizing agent (diisopropylbenzene hydroperoxide 5o small M part and 1,1°6,3-tetramethyl 0.06 parts by weight of active acid powder (mixture of butyl hydroperoxide 50 type broken part) was added and blended for 45 seconds. The obtained foundry sand mixture was made into 50 fins φ
Molded into a cylindrical shape between 50 and 20' in gas or aerosol form
After curing through sulfur ninede, the mold was demolded and a test piece was made. After curing, it was left to stand for 24 hours, and the resistance pressure was measured using a Jock-Fischer resistance pressure test.

1Jijp-forming agent -C1 diisopropylben-binoloperogizide (Comparative Example-7) and 1,1,3
．． The same is true for each of the 3-tetramethylbutylhydrono(-oxides (comparison 191.1-8)).
Active Ze [1n11 was determined in the same way in 149 Sui/Ko. Results are similar to those in Table-4.
', 1.2 parts by weight of furan system (#J l1ii) and thoroughly kneaded for 45 seconds, then oxidizing agents (50 parts by weight of cymenno hydroperoxide Add 0.06 g4j of active oxygen h (mixture of 50 critical parts) to 45
Kneaded for seconds. The obtained ♀11 sand mixed material was φ× for 50 minutes.
A test piece was made by molding it into a cylindrical shape with a thickness of 50 mm and hardening it through gaseous or aerosol sulfur dioxide. After curing, it was left to stand for 24 hours, and the resistance pressure was measured using a Joke-Fischer resistance pressure test. Cymene hydroperoxide (Comparative Example-9) and tert-butyl hydroperoxide (Comparative Example-9) were used as oxidizing agents.
10) were also measured in the same way using the same amount of active oxygen. The results are shown in Table-5.

Table-5

Claims (1)

[Scope of Claims] 1. A composition consisting of a refractory aggregate, an acid-curing resin, and an oxidizing agent, which is cured by blowing sulfur dioxide into a kneaded mold, where the oxidizing agent is CH or OR. It is characterized by being a mixture of at least one kind of aromatic hydroperoxide represented by CH5 or alicyclic hydroperoxide represented by CH5 and an aliphatic hydroperoxide represented by OH, (jH. Erodible mold composition.