SU975647A1 - Foaming agent - Google Patents

Description

The invention relates to foundry and can be applied in the preparation of liquid and plastic self-hardening mixtures used in the manufacture of molds and cores.

Known foaming agent l3, having the following composition, wt.%:

Lignosulfonate

53.60-64.20

binder

Compound six0, 02-0.10 of valence chromium 35.78-46.30

Water

However, it contains a toxic and carcinogenic compound of hexavalent chromium, which limits its use.

Closest to the invention to the technical nature is a foaming agent f 2, which contains ingredients in the following amounts, wt.%:

Lignosulfonate

56.6-61.0

binder 2,3-8,3.

Biuret 36,7-39,1

Water

The known foaming agent is characterized by relatively low foaming properties, slow air entrainment in the solution.

which slows down the process of generating foam.

The aim of the invention is to increase the degree of foaming and foam stability and the expansion of the raw material base.

This goal is achieved by the fact that the foaming agent, including Lignosulfonate Binder, Additive and Water, contains, as an additive, a sulphate melt in the following ratio of ingredients, wt.%: Lignosulfonate Bond 50.0-63.0

15 Sulfate Soap 3.0-15.0 WaterEverything Else

Sulfate soap, a by-product of sulphate pulping of coniferous wood in an alkaline solution, is an ointment from dark yellow to dark brown.

The chemical composition of sulfate soap mixture is approximately {Equal

25 quantities of sodium salts of fatty or resin acids mixed with neutral substances. The soap is contaminated with lignin, tannins and coloring agents, as well as mineral components.

Sulfate soap should contain wt.%:

Resinous and fatty acids and unwashed Not less than 4 Moisture Not more than 50

Ash Not more than 8

The average composition of sulphate soap is as follows, wt%:

Resin acids, 22.6-26.7 Fatty acids -23.0-31.6 Neutral substances4, 5-7.7 Phenols1.0-2.3 Inkrusty0-3-3.0 Sodium carbonate 0.1-0 , 3 Sodium sulfate 0.1-0.8 Caustic soda 0.1-2.0 Sv. Zanna. Alkali in terms of

nitrous oxide 4.4-5.4 Sulfur0.1-0.3

WaterEverything

Example. The foaming agent is prepared in the mixer by mechanical or otherwise mixing using the following method.

water and sulphate liquid are added to the mixer, stirred for 3-4 minutes, then lignosulfonate binder is added and mixing is performed for 2-3 minutes, after which the foaming agent is ready for use. The properties of the foaming agent do not change with time when stored under normal conditions of the tag sheraratura and pressure, so the foaming agent can be prepared for future use.

The control of the blowing agent is carried out by measuring the specific gravity, which should be 1.18-1.21 g / cm, depending on the content of ingredients.

The compositions of blowing agents are given in table. one.

Foaming properties are given in table. 2

As follows from the table. 1 and 2, the maximum content of sulphate gdyl in the foaming agent is 3-15%. Entering sulfate soap into the composition below the lower limit leads to a sharp reduction in the degree of foaming and foam stability. An increase in the sulfate content of the sdyl in the composition above the upper limit does not significantly affect the foaming properties and is not economically feasible.

The foaming agent surpasses the known one both in the degree of foaming and in the stability of the foam.

The use of a sulphate mjol in the foaming agent allows to increase the volume of air involved in the solution, speed up the process of air entrainment, reduce the time spent on foam generation, increase the foaming degree and foam stability, reduce the moisture content of the S frother, and also in a mixture containing the proposed frother. This is the economic effect of the invention.

Table 1 ,

Lignosulfonate binder

Biuret

Sulphate Soap Water

57 5

50

15 35

Claims (2)

38 Claims of Invention Frother, including lignosulfonate binder, additive and water, characterized in that, in order to increase the degree of foaming and foam stability and expand the raw material base, it contains as an additive sulfate soap in the following ratio of ingredients, wt.%: Table 2 Lignosulfonate I Binder 50-63 Sulfate, Soap 3-15 Water Others Sources of information that are taken into account in the examination 1. Author's certificate of the USSR 551294, cl. From 04/21/04, 1976. 2. Authors certificate of the USSR 490774, cl. C 04 B 15/02, 1974 rototype)