SU778896A1 - Binding "carbosyl" for producing liquid-glass based moulding and core mixtures - Google Patents

Description

, one

The invention relates to the manufacture of casting mixtures, molds and cores, in particular to casting. used to make foundry mixes.

Liquid glass-based, curing with carbon dioxide, ferrochromic slag, cement and other materials Cl is known

Closest to the proposed technical essence and the achieved result is a binder for the manufacture of casting mixtures based on liquid glass with the addition of wood pitch.

However, mixtures with known binders have difficulty knocking out from castings.

The purpose of the invention is to reduce the operation of knockout of glass mixtures from castings.

The goal is achieved by the fact that a binder based on liquid glass, including a technological additive - a product of wood raw material processing, contains, as a technological additive, tall oil pitch with a temperature of 1–2 hg from 70 to 120 ° C or ohm iggy ingredients, wt.%:

Liquid glass 60-94

Tall Peck6-40

Tall (sulphate) pitch is produced in significant quantities by pulp and paper mills at sulphate processing of wood raw materials for pulp.

Liquid glass is used in accordance with GOST 8263-56 (H 2.6-2.7;

10 tj 1.46-1.48 g / cm) and is manufactured by foundries from silicate blocks.

Binder Carbosil is prepared as follows.

. Ground glass is introduced into the liquid glass

15 tall sulphate pitch with a high softening temperature of 70. The composition is agitated until the components are evenly distributed in volume.

20

when saponified tall pitch is used, it is introduced into the molten glass in the molten state or, more conveniently, dissolved in water. Prepared in the same way, the binder provides a more uniform and high-quality combination of the binder components in the mixture.

In foundries, it is advisable

Combine the preparation of bindings 130115§.g6 30 and mixtures. B input - rfi apileBSift ne -... juice of liquid glass and sulphate pea in a hammer, melted or dissolved state and thoroughly mixing all components of the mixture by volume. The compositions of the binder Carboxyl and the known are given in Table 1. When the tall pitch is contained in the liquid glass below the lower limit, the improvement in knockability does not occur when the tall pitch content is greater than the upper limit, the mixture has a low strength and a high crushability. In tab. 2 shows the composition of the mixtures of the proposed binder. In tab. 3 shows the physico-mechanical and technological properties of mixtures of the proposed binder. It follows from the above tables that the knockability of mixtures using the binder Karbosil is 1.5-2 times less than that of mixtures using saponified wood pitch. The effect of improving dislodgement is due to the destruction of a film of liquid glass in the mixture, which occurs during the formation of a new orthano-mineral product when sodium (potassium) silicates interact with fatty and resin acids entering the pitch. In addition, tall oil pitch, which did not react, at high temperatures burns with the formation of gas, which, when it leaves the mixture, breaks the binder film. The preparation of the mixture with the binder Carbosil is intended for obtaining volumetric forms, rods of 1-3 grades of complexity, as well as as linings of forms; It is advisable to use mixtures with a content in the binding sulphate (tall) pitch at the upper limit in the manufacture of cores that form difficult-to-reach parts of the castings, and mixtures with a content of sulphate pitch limit are recommended to be used in the manufacture of thin-walled molds, liners for molds and chills. Table 1

Liquid glass, b-2.72 1.46-1.48 75 94 60

Sulfate pitch, softening temperature 90 ° С

40 25 6 Sulfate pitch omkshenny, 20% aqueous solution

Sulfate pitch, 40% aqueous solution

Sulphate pitch, softening temperature 70 ° С

Sulphate pitch, softening temperature 120С

Sulphate pitch saponified

, iK -r -i-i- -; ---..., -.-..-----. -. - -. .-..- .j, .-- .-.,. ... f Washed wood pitch Quartz sand 91 92 93 91 91.5 1Q02A

- 40 30 - - 25 - - .25 -

15 Table 70 75 75 75 85 92 92 91 93 85

Ferrochromic acid 1 1

2

3

four

five

6

Work knockout when heated to temperatures, ° C:

Continued table. 2

9

- 8.5

T a

faces

Claims (3)

Claim 1. Binder Carbosil for the manufacture of molding and core mixtures based on liquid glass, including a technological additive - a product of processing wood raw materials, characterized in that, in order to reduce the knockout, as a technological additive, the binder contains tall pitch with a blowing weight ratio. %: ? Liquid glass Tall pitch of ingredients,? 60-94 6-40 s in connection55 2. The binder according to claim 1, distinguished by the fact that it contains tall pitch with a softening temperature of 70 to 12 (Pc. 3. The binder according to claim 1, characterized in that it contains a saponified tall oil pitch. Sources of information taken into account during the examination 1. Exchange of experience in the implementation of technology for the manufacture of foundry cores and forms of LSS. M., NIIInformtyazhmash. 1966, p. 277. 2. Copyright certificate of the USSR No. 171994, cl. B 22 C 1/02, 1964. Circulation 889 Subscription Branch ”PPP ^- Patent, Uzhhorod, st. Project, 4 VNIIIPI Order 7900/9