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

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.

Claims3

Dependent claims

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.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

16/073,569Filed 4 Feb 2017

Priority

CN 201610082019.45 Feb 2016

Published

US 2019/0388960 A126 Dec 2019

Granted

19 Apr 2022

Term ends

Not estimatedThe source records don’t support an estimate.

Classification14 codes

B22C 1/188
Contaming ammonium or metal silicates, silica sols: alkali metal silicates
B22C 1/10
Characterised by additives for special purposes, e.g. indicators, breakdown additives: for influencing the hardening tendency of the mould material
B22C 1/181
Of inorganic agents: cements, oxides or clays
B22C 9/02
Moulds or cores ; Moulding processes: sand moulds or like moulds for shaped castings

Curing agent for water glass molding and manufacturing method and use thereof

Life of this patent

Curing agent for water glass molding and manufacturing method and use thereof

Life of this patent

Abstract

Claims3