SU1444051A1 - Composition of antistick coating for pattern and core tooling being heated - Google Patents

Abstract

The invention relates to release coats for heated model rod tools and can be used in the manufacture of rods (C) and molds (P) from mixtures based on modified technical lignosulfonates. The purpose of the invention is to increase the number of removals C and improve the quality of the surface C and F, the composition contains {t metric quartz ground and production waste with the following ratio of ingredients, wt.%: Quartz ground quartz 5-15; waste of production of lanolin 15 - 35; tar from the distilling of fatty acids of salomass for stearin — the rest. Due to the fact that the release coating contains -g with fatty tar and waste of lanolin production, the adhesion of the coating to the tooling is reduced, which allows an increase in the number of discharges from 25 to 35 times with a single coating .F when removing them from a snap. 2 tab.

Description

The invention relates to foundry, in particular, to separation coating compositions for heated model-rod tooling, used primarily in the manufacture of molds and cores from mixtures based on modified technical lignosulfonates.

The known coating is intended to provide the possibility of multiple-: multiple stripping of rods manufactured on hot equipment from mixtures based on resin binders.

However, the mixtures based on modified technical lignosulfonates do not provide a sufficient amount of coatings. This is reflected in the deterioration of the surface of the rods and the shapes when they are removed from the hot snap.

The purpose of the invention is to increase the number of removals and improve the quality of the surface of the rods and shapes.

Separating coating for heated model-rod tool contains in mass%:

Ground quartz pulverized5-15 Waste from the production of lanolin 15-35 Tar from the distillation of fatty acids of salomass for stearin Else Waste from the production of lanolin (OGSh) is an oily mass from light yellow to light brown. GTP is formed as a result of the oxidation of wool fat with a potassium halide in a sulfuric acid medium and subsequent alkaline treatment. The PLA paste consists, in wt%: The sodium salts of fatty acids 85-9.0 Lanolin 10-15 PLA are characterized by the following indicators:

Mass fraction of non-repeatable substances,% not more than 15

Mass fraction of fatty acids,% not less than 20 Mass fraction of dry residue,% not less than 40 Mass fraction of volatile substances,% not more than 10

0

five

0

five

0

five

0

five

0

five

Mass dol alkali in terms of,% 3-9

pH of the aqueous extract, not less than 9

The tar from the distillation of fatty acids of salomass for stearin (fatty tar) is a water-insoluble solid mass of dark brown color.

The tar consists of neutral fat, part of fatty acids, acid, lactones, unwashed, dyes, polymer products and other non-volatile impurities. The amount of tar depends on the content of these impurities in the initial fatty acids of salomass, as well as on the distillation regime in cyclic or continuous plants.

Tar is characterized by the following indicators: I

Pour point

° С, not lower than 50

Sludge content, mg KOH not lower than .160

Acid number, mg KOH n below 30

Mass fraction of mechanical impurities,% not exceeding 1.0

Iodine number, mg of iodine not lower than 22

Mass fraction of moisture,% not more than 8.0

Fat tar is used to reduce the adhesion of the mixture to the heated equipment.

Marshalite was used as powdered ground quartz. Ground quartz contributes to obtaining a durable coating that is not prone to slipping from the surface of a hot snap. This leads to higher quality cores and shapes.

The invention is illustrated by the following example.

To prepare separation coatings, 5 separation coating compositions were prepared.

In the manufacture of release coating compositions, molten OGSh paste is introduced into the molten fatty tar, melted paste, 2-3 minutes. Allow 10-15 minutes for the foam to form. Then add marshalite and stirring

at 60-70 ° C until a homogeneous mass is obtained. This mass is poured into a special form, where, cooling, it hardens in the form of a rod. At the contact of this rod with heated equipment, the lubricant melts and is evenly distributed over its surface. In the form of a rod, a release coating is used to apply it to a rig with a surface of a simple configuration.

For application to a rig with a complex configuration surface, a separating hard coating is dissolved in kerosene to a consistency allowing the use of a tampon or sprayer.

Table 1 shows the release coating compositions. ,

In tab. 2 shows the properties of the release coatings of formulations 1-6.

As can be seen from the table. 2, the number of removals of the cores, up to the necessity of applying the next layer of release coating, ranges from 25-35, which allows to improve the surface of the molds and cores and thereby increase the surface cleanliness and dimensional accuracy of castings.

The use of the proposed release coating for heated model-core tooling in comparison with the known one provides a reduction in the adherence of the mixture to the heated casting tooling, which allows an increase in the number of molds and cores from 25 to 35; improving the quality of the surface of the rods and the molds, which makes it possible to increase the purity of the surface of the castings.

Claims (1)

Invention Formula The composition of the release coating for the heated model-rod tooling, including square crushed ground, hydrophobic greasy-like and hard materials, different and. and with the fact that, for the purpose of h ;; the number of removals of molds and rods from tooling and the improvement of surface quality of molds and rods, the composition as a hydrophobic ointment-like This material contains waste from the production of lanolin, and as a hydrophobic solid, tar from the distillation of salomass fatty acids for stearin in the following ratio, percent by weight: Ground quartz pulverulent 5-15 Waste from the production of lanolin15-35 Tar from the distillation of fatty acids of salomass for stearin Table Waste production of lanolin 15 I Tar from the distillation of fatty fatty acids for stearin 70 25 35 Marshalit 15 65 60 10 5 Vaseline Technical wax table 2 Properties Quantitative indicators of the properties for the compositions according to the table. t one izr 25-28 30-35 25-30 10-15 5-10 5-10