# US 11,305,335 B2 · Curing agent for water glass molding and manufacturing method and use thereof

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- Number: US 11,305,335 B2
- Document ID: US11305335B2
- Status: Granted
- Kind: B2
- Application number: 16/073,569
- Filed: 2017-02-04
- Published: 2019-12-26
- Granted: 2022-04-19
- Earliest claimed: 2016-02-05
- Assignees: Jinan Shengquan Group Share-Holdings Co., Ltd
- Applicants: Jinan Shengquan Group Share-Holding Co., Ltd.
- Inventors: Jianxun Zhu; Huimin Yao
- Web page: https://patentgrep.com/patent/US11305335B2

## CPC

- B22C 1/188: {Alkali metal silicates}
- B22C 1/10: for influencing the hardening tendency of the mould material (influencing the hardening tendency of the binding agent only B22C1/16)
- B22C 1/181: {Cements, oxides or clays}
- B22C 9/02: Sand moulds or like moulds for shaped castings
- C04B 14/066: {Precipitated or pyrogenic silica}
- C04B 24/02: Alcohols; Phenols; Ethers
- C04B 24/045: {Esters, e.g. lactones}
- C04B 24/32: Polyethers, e.g. alkylphenol polyglycolether
- C04B 28/26: Silicates of the alkali metals
- C04B 40/0039: {Premixtures of ingredients}
- C04B 2103/10: Accelerators; Activators
- C04B 2111/00939: {for the fabrication of moulds or cores}
- B22C: FOUNDRY MOULDING (moulding refractory materials in general B28B)
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE

## Abstract

A curing agent for water glass molding comprises: ester; amorphous silica; and water. The amorphous silica is formed by means of a pyrolysis method and/or by means of a precipitation method. Also disclosed is a use of the curing agent for water glass molding in preparation of a casting mold and a mold core. Respective components of the curing agent comprising ester, amorphous silica and water are mixed at a high speed to form a suspension. Next, the suspension is applied to prepare a water glass self-hardening sand. The curing agent does not cause powder contamination, and can be measured and added conveniently. Also disclosed are a manufacturing method of the curing agent for water glass molding and a water glass self-hardening sand.

## Claims

### Claim 1

A curing agent for casting water glass comprising 20-30% of an ester, 40-60% of an amorphous silica; 6-12% of an alcohol; and 10-18% of water by mass fraction; wherein the amorphous silica is a pyrogenic amorphous silica and/or a precipitated amorphous silica;
wherein the ester is any one selected from a group consisting of glyceryl monoacetate, glyceryl diacetate, glyceryl triacetate, ethylene glycol diacetate, propylene carbonate, dibasic esters, and a mixture of at least two thereof;
wherein the alcohol is any one selected from a group consisting of ethanol, methanol, propanol, isopropanol, butanol, isobutanol, benzyl alcohol, ethylene glycol, polyethylene glycol, and a mixture of at least two thereof.

### Claim 2 (depends on 1)

The curing agent according to claim 1, wherein the alcohol is ethanol.

### Claim 3 (depends on 1)

A method for preparing the curing agent for casting water glass according to claim 1, comprising the following steps: (1) first, adding the ester weighed according to the mass fraction into a stirring tank of a high-speed mixer and stirring; (2) inputting the water weighed according to the mass fraction, and inputting the alcohol weighed according to the mass fraction; adjusting rotation speed to 800 rpm or more, and then adding the amorphous silica, and stirring for 10-20 minutes to form a suspension to obtain the curing agent for casting water glass.