SU1724415A1 - Method of producing water-glass binder - Google Patents

Abstract

The invention relates to a foundry and can be used to prepare a liquid glass binder. The purpose of the invention is to prevent the binder from splitting during storage, to speed up its preparation, as well as to improve the quality of the rods and shapes by increasing their strength. The method consists in the fact that before entering the sodium tripolyphosphate, water glass is mixed with an anion-active frother in an amount of 0.01–0.5 wt.%, And sodium tripolyphosphate in an amount of 1–30 wt.%. Moreover, it is introduced either as a powder in the amount of 1-5 wt.%, Or in the form of an aqueous solution of 15–20% concentration in the amount of 5–30 wt.%. The method makes it possible to prevent separation of the binder during storage, to speed up its preparation, as well as to improve the quality of the forms and rods by increasing their strength. 1 hp f-ly, 7 tab. sl C

Description

The invention relates to a foundry and can be used to prepare a liquid glass binder.

The purpose of the invention is to prevent the binder from splitting during storage, to speed up its preparation, as well as to improve the quality of the rods and shapes by increasing their strength.

The essence of the invention is that when preparing a liquid glass binder, liquid glass is pre-mixed with a frother, anionic class in an amount of 0.01-0.5 wt.%, Before introducing sodium tripolyphosphate, after which sodium tripolyphosphate is introduced in powder form or as 15-20% aqueous solution in an amount of 1-30 wt.%.

Liquid glass is used to prepare the binder. When using powdered sodium tripolyphosphate, liquid glass with a density of 7.44-1.48 g / cm3 is used. When introducing an aqueous solution of sodium tripolyphosphate, liquid glass with a density of 1.48-1.52 g / cm3 is used. The modulus of liquid glass varies from 2.3 to 3.0. DS-RAS. UGNR, nickel, sulfanol, soap-iodate, asidol, Petrov contact, etc. belong to the class of anionic surfactants.

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The compositions of the liquid glass binder obtained according to the invention and its properties are given in table. one.

Examples of the use of the binder in the compositions of molding mixtures and their physicomechanical properties are given in Table. 2-7.

From tab. 1 that the proposed method of preparing a modified binder shortens the time of mixing the composition from 6-5 hours to 5-10 minutes, eliminates precipitation of phosphates and separation of the binder by the size of the silicate module. The use of a modified binder for mixtures according to the C02 process (Tables 2 and 3) of liquid self-hardening mixtures (Tables 4 and 5) and mixtures of cold hardening (Tables 6 and 7) shows that there is no separation of liquid glass and phosphate deposition. contributes to an increase in the strength of the mixture at the final stages of hardening by 30-60%, reducing the fallability by 20-40% and residual strength 1.5-2.0 times.

Claims (2)

1. A method for preparing a liquid glass binder used to make molding and core sands, comprising mixing liquid glass with sodium tripolyphosphate, characterized in that, in order to prevent binder from storing during storage, speed up its preparation, as well as improving the quality of the rods and shapes, to increase their strength, the liquid glass is mixed with an anionic class frother in an amount of 0.01-0.5 wt.% before entering sodium tripolyphosphate, and sodium tripolyphosphate in an amount of 1-30.0 wt.% 2. A method according to claim 1, characterized in that the sodium tripolyphosphate is introduced either in powder form in an amount of 1-5% by weight or in an aqueous solution of 15-20% concentration in an amount of 5-30% by weight. Table The content of components, wt.%, In the composition of the binder Components I In the numerator, the value K of liquid glass in the upper part of the 1000 mm cylinder, in the denominator at the bottom of the cylinder after the modified liquid glass has stood for 48 h. I Note. Blends for the C0a process. Strength nz gap after C02, MPa: after 2 h Residual strength after calcination in compression, MPa, at a temperature, ° С: The composition of the binder according to table 1 56.0- 6-7, 5 26, 0 Vol1.5-2.0 Frother DS-PAC0,100,10 0.12 Fuel oil1,01,0 Kaolin-2.0 Ferrochrome slag or fire retardant3,53,50,9 Quartz sand57,987,990,9 Regenerate30-Note. Liquid samohaerleksch table 2 0.30 0.82 0.05 0.32 0.20 0.76 0.23 0.05 0.20. 0.23 0.36 0.15 Physico-mechanical properties of the mixture Compressive strength, MPa, through time, hours: one 3 24 Dropsiness,% Residual compressive strength, MPa, after calcination at temperature 300 500 700 1000 The composition of the binder according to table 1 25 four five Mazut0.8 EKR0.5 Propylene Carbonate Ethylene Glycol Acetate - Fire Retardant Ferrochrome slag 3.0 Kaolin2.5 Quartz sand 88,2 Note. Blend Holo Table 5 The performance properties for the composition of the mixtures, respectively, table 4 0.57 0.42 0.28 0.0 0.68 0.54 0.42 0.92 Table 6 ,five 0.7 94.8 Table 7