公开(公告)号：JPS57137051A

公开(公告)日：1982-08-24

申请号：JP2194281

申请日：1981-02-17

Applicant: KAO CORP

Inventor： ITOU KAZUO ,  KANEKAWA HIROMI ,  TANI TAKUYA

IPC: B22C1/10 ,  B22C1/22 ,  B22C9/12

Abstract: PURPOSE:To prolong the pot life of compound molding sand considerably by using specific hydroperoxide as an oxidizing agent in the stage of compound an acid setting resin and an oxidizing agent with molding sand, molding the mixture to a mold, and hardening the same with gaseous SO2. CONSTITUTION:In molding a casting mold, 1 or >=2 kinds of urea-formaldehyde resins, phenol-formaldehyde resins and furan resins are added as acid setting resins to molding sand at 0.4-3.0wt% basing on the weight of the molding sand. Also, 1 or >=2 kinds of oxidizing agents such as methane hydroperoxide, cymene hydroperoxide, diisopropylbenzene hydroperoxide, etc. expressed by the formulas [I]and[II]are added to the molding sand at 0.01-0.3% in terms of amt. of active oxygen. These are kneaded, and the mixture is packed in prescribed molds, after which gaseous SO2 is passed therethrough to harden the sand mold, whereby the mold is produced. The pot life of the compounded sand of this case is extended considerably and the compounded sand is used for the mold in high yields.

公开(公告)号：JPS6268654A

公开(公告)日：1987-03-28

申请号：JP20847985

申请日：1985-09-20

Applicant: KAO CORP

Inventor： MIYAUCHI KEIJI ,  TANI TAKUYA ,  KAWAKATSU YASUYUKI

IPC: B22C9/12

Abstract: PURPOSE:To surely harden the sand near the surface of a pattern or molding board by packing molding and curable by gas into a chamber formed of the molding board, pattern and flask, inserting nozzles into the sand in such a manner that the top ends of the nozzles approach the surface of the pattern or molding board and passing the curing gas therein. CONSTITUTION:The molding sand 4 curable by gas is packed into the chamber formed of the molding board 1, the pattern 2 and the flask 3 and the gushing nozzles 5 are inserted into the nozzles 5. The length of the nozzles is preliminarily so adjusted that the top ends of the nozzles 5 approach the surface of the molding board 1 or the pattern 2. The curing gas is supplied through a gas introducing port 6 to surely cure the sand near the surface of the molding board 1 or the pattern 2. The required amt. of the curing gas is thereby decreased.