# US 9,433,997 B2 · Inorganic binder composition for casting

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- Number: US 9,433,997 B2
- Document ID: US9433997B2
- Status: Granted
- Kind: B2
- Application number: 14/953,618
- Filed: 2015-11-30
- Published: 2016-06-16
- Granted: 2016-09-06
- Earliest claimed: 2014-12-16
- Assignees: Dr Axion Co., Ltd.
- Applicants: Dr Axion Co., Ltd.
- Inventors: Man Sig Lee; Min A Bae; Myung Hwan Kim; Sang Ho Ha
- Web page: https://patentgrep.com/patent/US9433997B2

## CPC

- B22C 1/167: {Mixtures of inorganic and organic binding agents}
- B22C 1/02: characterised by additives for special purposes, e.g. indicators, breakdown additives
- B22C 1/188: {Alkali metal silicates}
- B22C 9/06: Permanent moulds for shaped castings (moulds for ingots B22D7/06)
- B22C 9/10: Cores; Manufacture or installation of cores {(breaker cores B22C9/084)}
- B22D 15/00: Casting using a mould or core of which a part significant to the process is of high thermal conductivity, e.g. chill casting; Moulds or accessories specially adapted therefor
- B22C: FOUNDRY MOULDING (moulding refractory materials in general B28B)
- B22D: CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES (shaping of plastics or substances in a plastic state B29C; metallurgical processing, selection of substances to be added to metal C21, C22)

## Abstract

The present disclosure relates to an inorganic binder composition for casting, including: water glass of 40 to 70 parts by weight; nano-silica of 5 to 35 parts by weight; a Li-based water resistant additive of 0.1 to 10 parts by weight; an organic silicon compound of 0.1 to 10 parts by weight; and an anti-sand burning additive of 1 to 10 parts by weight. Furthermore, the present disclosure relates to a core manufactured by using the inorganic binder composition and a cast manufactured so as to include the core.

## Claims

### Claim 1

An inorganic binder composition for casting, comprising:
water glass of 40 to 70 parts by weight;
nano-silica of 5 to 35 parts by weight;
a Li-based water resistant additive of 0.1 to 10 parts by weight;
an organic silicon compound of 0.1 to 10 parts by weight; and
an anti-sand burning additive of 1 to 10 parts by weight.

### Claim 2 (depends on 1)

The inorganic binder composition for casting according to claim 1,
wherein the water glass includes SiO2 of 25 to 36 weight % and Na2O of 7 to 15 weight %.

### Claim 3 (depends on 1)

The inorganic binder composition for casting according to claim 1,
wherein the Li-based water resistant additive includes one or more selected from lithium carbonate, lithium silicate, lithium hydroxide, lithium sulfate, lithium bromide, and lithium acetate.

### Claim 4 (depends on 1)

The inorganic binder composition for casting according to claim 1,
wherein the organic silicon compound includes one or more selected from methyltriethoxysilane, sodium methylsiliconate, methyltrimethoxysilane, potassium methylsiliconate, butyltrimethoxysilane, and vinyltrimethoxysilane.

### Claim 5 (depends on 1)

The inorganic binder composition for casting according to claim 1,
wherein the anti-sand burning additive includes one or more selected from monosaccharides, polysaccharides, and disaccharides.

### Claim 6 (depends on 1)

A core manufactured utilizing an inorganic binder composition of claim 1.

### Claim 7 (depends on 6)

A cast manufactured so as to include a core of claim 6.