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Acid-curable, refractory particulate material composition for forming mold

A technology of granular materials and compositions, applied in the direction of casting molds, casting molding equipment, cores, etc., can solve the problems that the strength of casting molds needs to be further improved

Inactive Publication Date: 2007-07-11
KAO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] One method of making a self-hardening mold involves blending an acid-hardening resin, a hardener, and a refractory granular material (such as silica sand) and mixing to make a mold at room temperature. Hardeners used include inorganic acids such as sulfuric acid and phosphoric acid, And organic sulfonic acids, such as toluenesulfonic acid and xylenesulfonic acid, but the mold strength needs to be further improved

Method used

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  • Acid-curable, refractory particulate material composition for forming mold
  • Acid-curable, refractory particulate material composition for forming mold
  • Acid-curable, refractory particulate material composition for forming mold

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Synthesis Example 1: Synthesis of polycondensation product of furfuryl alcohol-phenol-formaldehyde (phenol-modified furan resin)

[0041]Add 975 parts (10.4 moles) of phenol and 18 parts (0.16 moles) of 48.5% potassium hydroxide aqueous solution to a four-necked flask equipped with a thermometer, a condenser and a stirrer, and add at a constant temperature of 80°C for about 1 hour 507 parts (15.5 moles) of 92% paraformaldehyde. Keep at a constant temperature of 80° C. for 6 hours, then cool rapidly and adjust its pH value to 5.0 by neutralizing with 50% sulfuric acid. After neutralization, centrifuge Isolate the neutralized salt. Add 1500 parts of furfuryl alcohol to the obtained resin, and then add 0.3 parts of N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane to obtain phenol-modified Furan resin composition.

Embodiment 2

[0042] Synthesis Example 2: Synthesis of phenol-formaldehyde polycondensation product (phenolic resin)

[0043] Add 1950 parts (20.7 moles) of phenol and 36 parts (0.31 moles) of 48.5% potassium hydroxide aqueous solution to a four-necked flask equipped with a thermometer, condenser and stirrer, and add at a constant temperature of 80°C for about 1 hour 1014 parts (31.1 moles) of 92% paraformaldehyde. When the viscosity of the system reaches 30,000 centipoise at 25°C, it is rapidly cooled and neutralized with 50% sulfuric acid until the pH value reaches 5.0. After neutralization, centrifuge Separate the neutralized salt. Add water to it until its water content reaches 20%, and then add 0.3 parts of N-β-(aminoethyl)-γ-aminopropylmethyldimethoxysilane to obtain a phenolic resin combination thing.

Embodiment 3

[0044] Synthesis Example 3: Synthesis of furfuryl alcohol-urea-formaldehyde polycondensation product (urea-modified furan resin)

[0045] Add 682.4 parts (6.96 moles) of furfuryl alcohol, 85.7 parts (1.43 moles) of urea, 231.9 parts (2.86 moles) of 37% formaldehyde and 0.08 parts of 25% hydroxide to a four-necked flask equipped with a thermometer, condenser and stirrer Sodium aqueous solution, the mixture was further reacted at 100°C for 1 hour. Thereafter, 0.2 parts of 10% hydrochloric acid was added thereto, followed by further reaction at 100°C for 3 hours. 0.3 parts of N-β-(aminoethyl)-γ were added thereto -Aminopropylmethyldimethoxysilane to obtain a urea-modified furan resin composition.

[0046] According to the present invention, the acid-hardening resin composition thus obtained is used to prepare a granular composition for casting to form a casting mold. If a solvent needs to be added, it is added to the above-prepared resin composition and mixed with it.

[0047]...

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Abstract

An acid-curable, refractory particulate material composition for forming a mold which can improve the mold strength. The composition comprises a refractory particulate material, a binder composition containing an acid-curable resin, an acid-containing curing agent composition, and at least one solvent selected from among the alcohols (1): R1-OH, ether alcohols (2), and esters (3). In said formulas R1 represents a straight-chain or branched aliphatic haydrocarbon group having 3 to 12 carbon atoms or a benzyl group; R2 represents a straight-chain or branched aliphatic hydrocarbon group having 1 to 10 carbon atoms or a phenyl or benzyl group; R3 represents an ethylene or trimethylene group; n is an integer of 1 to 12; R4 represents a phenyl or methyl group; and R5 represents an aliphatic hydrocarbon group having 2 to 6 carbon atoms or -(R3-O)n-R2.

Description

technical field [0001] The present invention relates to an acid-hardening refractory granular material composition for casting moulds, which can be particularly suitable for the manufacture of self-hardening casting moulds. Background technique [0002] One method of making a self-hardening mold involves blending an acid-hardening resin, a hardener, and a refractory granular material (such as silica sand) and mixing to make a mold at room temperature. Hardeners used include inorganic acids such as sulfuric acid and phosphoric acid, And organic sulfonic acids, such as toluenesulfonic acid and xylenesulfonic acid, but the mold strength needs to be further improved. That is, if a higher mold strength can be obtained, the amount of acid-curable resin and hardener can be reduced to reduce the gas generated, which can improve the environment, thereby reducing the defects caused by gas in the resulting mold . Overview of the invention [0003] The object of the invention is to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C1/22
CPCB22C1/2266B22C1/22
Inventor 仲井茂夫加藤雅之泽益男
Owner KAO CORP