SU806230A1 - Pickup preventing paint for casting moulds and cores - Google Patents

Description

i

The invention relates to foundry, in particular to quick-drying non-stick paints for casting molds and cores that are not subjected to heat drying.

These paints should have a high mixing resistance, good covering ability, high heat resistance and durability of the coating, and technologically necessary drying time.

Such inks include organic binding and organic solvents.

A known paint containing a refractory filler, as a binder, a solution of rubber in gasoline (glue no. 4508) and a solvent — gasoline Galosha 1.

However, this paint has low heat resistance and insufficient sedimentation stability. In such a solution, the particles of the refractory filler quickly settle to form a dense, difficult to place sediment. The paint has an unsatisfactory covering ability and requires constant mixing, which impairs the manufacturability of its application.

Also known is a paint containing a refractory napto tnitel, and as a binder an alkylphenol resin, for example, 101M resin, and a solution of rubber in gasoline, for example glue No. 4508, as a solvent for gasoline Galosha 2.

This paint also has low heat resistance and insufficient sedimentation stability.

The closest to the proposed by the technical essence and the result being achieved is the paint, which includes a refractory filler, as a binder - polybutyl titanate and a solution of rubber in gasoline and a solvent for a given ratio of ingredients. This paint has a high temperature resistance and provides sufficient cleanliness of the surface of castings 3.

The drawback of paint is low sedimentation stability and low covering power.

The purpose of the invention is to increase the sedimentation stability and opacity of the paint.

The goal is achieved by the fact that the paint, including a refractory filler, polybutyl titanate, a solution of rubber in gasoline, and the solvent additionally contains a by-product of the production of crystalline silicon, in the following ratio of ingredients, weight. %: Polybutyrate 4-15 6-11P / 4 rubber solution 4-6 in gasoline 46-36 Solvent By-product of the production of crystalline silicon Refractory filler Else By-product of the production of crystalline silicon (silica dust) is a thin, non-porous, high-silica amorphous chemical composition , weight Silicon dioxide 80-90 Carbon 3-10 Aluminum oxide 1-4 Iron oxide 1.5-1.6 Calcium oxide 0.3-1.7 A by-product of the production of crystalline silicon with a particle size of up to 3 μm will be 70% of the total Ju 3-20 microns will be 0 ° / o with a size of 20-50 microns - 10%, and with a size of more than 50 microns - 10% of the total content. Dispersed systems with particle sizes up to several microns are sedimentation-resistant due to the fact that in such systems, the Brownian motion of particles prevails over their severity. Introduction to the composition of nonstick paint by-product of the production of crystalline silicon, which is a silica dust, particle size K.1, energy 1..u.ch ish., 1., .Pc ... j ".v. ™ .K. ....... The composition of which contains 70% of particles up to 3 microns in size contributes to an increase in the sedimentation stability of the coating. . As a refractory filler in the compositions of non-stick paints, for example, zircon, marshalite or kyanite can be used for steel castings, graphite (GLS and GL) - For iron castings, talc for castings from colored splavs. The nonstick paint is prepared as follows. Solvent (Galosh gasoline) in a solution of rubber in gasoline (glue No. 4508) is poured into the paddle type closed-type paddle type gun according to the paint composition. These materials are transferred until the glue dissolves completely (within 10–15 min). Polybutyl titanate is introduced into the resulting solution and transfer continues for another 5-10 minutes. Then, a refractory filler and silica dust are introduced and all components are moved until a uniform suspension is obtained (30-35 minutes). Sedimentation stability is determined by the method based on direct control of the change in the concentration of fillers along the height of the sedimentometer. The sedimentation stability of the paint is estimated by the coefficient of delamination during settling for 1.3 and 24 hours: K -., Where Ay is the difference in density of paints between the lower and upper sections of the sediometer, g / cm UISH-original ink density, g / cm h - distance between sections, see. The coating power of paints was evaluated visually. In tab. 1 shows the compositions of paints, including those with silica dust below the lower limit (1) and above the upper limit (5), as well as the composition of the lime paint (6). Table.

Graphite GLS-1 or

39.5 GLS-2

5,010.0 1.52,0

1O, 04.0

5, O6.0 39.046

34.0

4O

34.0

37, O

5.05.0

5.0

5.0

6.0

7.0

15.O 1O, O

10.0

4.0

5.0

6.0

36.0 39.0 4O, O

The coefficient of the Kp X 1O bundle when settling for, h:

table 2

Claims (1)

Claim Non-stick paint for foundry molds and cores, including a refractory filler, polybutyl titanate, 6–11% 35 solution of rubber in gasoline and a solvent, characterized in that, in order to increase sedimentation stability and improve hiding power, the paint additionally contains a by-product of crystalline silicon production the following ratio of ingredients, weight. %: Polybutyl titanate 4-15 6-11% solution of rubber in gasoline 4-6 Solvent 46–36 43 A by-product of the production of crystalline, silicon 2-6 Refractory filler