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Binder composition for casting mold formation and process for producing casting mold using the binder composition for casting mold formation

A manufacturing method and adhesive technology, applied in the direction of manufacturing tools, casting molding equipment, casting molds, etc., can solve problems such as hindering the spheroidization of castings, deterioration of the working environment, and unsatisfactory sulfuric acid, so as to improve the strength of the casting mold and the initial strength Effect

Inactive Publication Date: 2011-06-22
GUN EI CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sulfur dioxide deteriorates the working environment, or becomes a factor that hinders the spheroidization of castings
Therefore, the use of sulfuric acid in large quantities is not ideal

Method used

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  • Binder composition for casting mold formation and process for producing casting mold using the binder composition for casting mold formation
  • Binder composition for casting mold formation and process for producing casting mold using the binder composition for casting mold formation
  • Binder composition for casting mold formation and process for producing casting mold using the binder composition for casting mold formation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0107] (adhesive composition)

[0108] Add 859.2 parts by mass of furfuryl alcohol, 47.05 parts by mass of urea, 65.9 parts by mass of paraformaldehyde 92% by mass, and 2.0 parts by mass of aqueous sodium hydroxide solution of 15% by mass into a four-port thermometer, cooler and stirrer In the flask, it was made to react at 80 degreeC for 1 hour, after that, 3.0 mass parts of hydrochloric acid of 10 mass % was added, and it was made to react further for 3 hours. After that, add 2.0 mass parts of 15% aqueous sodium hydroxide solution and 28.84 mass parts of urea by mass, and further make it react for 30 minutes, and then add a silane coupling agent (N-β (aminoethyl) γ-aminopropyl Methyldimethoxysilane) 2 parts by mass to obtain 1010 parts by mass of an adhesive composition (A) containing a (co)condensate obtained by condensation of urea, furfuryl alcohol, and aldehydes, free furfuryl alcohol, and water. The water content in 1010 parts by mass of the adhesive composition (A) wa...

Embodiment 2

[0124] Except using alumina sand (manufactured by (strain) Cosmo, aluminum sand 350# new sand) instead of quartz sand, the test piece is made in the same way as in Example 1, and it is measured in the same way as in Example 1 from the beginning of curing through 30 minutes, 1 Compressive strength and bulk density after 1 hour, 3 hours and 24 hours. The results are shown in Table 1.

Embodiment 3～6

[0142] To 100 mass parts of quartz sand, add 1 mass part of the following various binder compositions and curing agent (containing 67% by mass of xylene sulfonic acid and 75% by mass of sulfuric acid by mass in aqueous solution) 0.4 mass Parts are mixed with a Sichuan formula universal mixer to obtain the mixed molding sand of each embodiment.

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Abstract

A binder composition for casting mold formation which can give a casting mold having sufficient strength without complicating the production step; and a process for producing a casting mold using the binder composition for casting mold formation. The binder composition for casting mold formation is characterized by comprising an acid-curable resin, water, and the chloride of a metal. The composition is further characterized in that the acid-curable resin comprises furfuryl alcohol and one or more products of the condensation or co-condensation of one or more members selected from a group consisting of furfuryl alcohol, phenols, and urea with an aldehyde, and that the metal is an alkaline earth metal and / or a zinc-family element.

Description

technical field [0001] The present invention relates to a mold-making adhesive composition capable of improving the strength of a mold, and a method for manufacturing a mold using the mold-making adhesive composition. [0002] This application claims priority from Japanese Patent Application No. 2008194719 filed on July 29, 2008, the entire contents of which are hereby incorporated by reference. Background technique [0003] Conventionally, self-solidifying molds are known as one type of casting molds. The so-called self-solidifying casting mold is made by adding a binder mainly composed of an acid-curable resin and a curing agent such as sodium xylene sulfonate or phosphoric acid to refractory granular materials such as quartz sand, and after mixing, the obtained The mixed sand is filled into the mold and the binder is allowed to cure. [0004] The so-called acid-curable resin generally refers to a resin mainly made of furfuryl alcohol, urea, phenols, formaldehyde, etc., ...

Claims

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Application Information

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IPC IPC(8): B22C1/10B22C1/22
CPCB22C1/2253B22C1/224
Inventor 永井康弘吉村正司
Owner GUN EI CHEM IND
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