SU900931A1 - Binder for making casting mould and cores hardened by heat drying - Google Patents

Description

one

The invention relates to foundry production, in particular, to binder compositions or the manufacture of foundry cores and heat-curable molds.

Binders for the foundry industry on an oil basis, for example, based on fatty acid oil 1, are widely known.

This binder is characterized by a high vapor removal capacity and causes an unpleasant odor during the heat curing process.

The closest to the proposed technical essence and the achieved result is a binder for the manufacture of casting cores and J) Orme, cured by heat drying, containing the product of distillation of fatty acids from vegetable raw materials in the form of tall oil fatty acids and vegetable oils respectively 26/8 and 19 , 5 weight.%, Desiccant in the form of maleic anhydride 1.7 wt.%, Rosin 9, p wt.% And white spirit 43/0 wt.%, Manufactured according to TU 6-10-1317-76 under the technical mark 4 PG 2.

However, we dare on this binder to take a long curing time (drying), and the binder itself is expensive, since its production uses expensive ingredients (vegetable oils, maleic anhydride, rosin). Binder 4 PG has a low non-volatile content (57%) and a high content

10 volatile (43.0%) substances, due to which the atmosphere of foundries is polluted.

The purpose of the invention is to increase the strength of the rods and molds in the dry state and shorten the drying time.

This goal is achieved by the /

20 that the binder for the manufacture of casting cores and heat-curable molds, including the product of the distillation of fatty acids from vegetable raw materials, desiccants and white25 spirit, contains as a product the distillation of fatty acids from vegetable raw materials waste in the form of oil and fat black cotton oil with the following the ratio of ingredients, wt%:

Waste in the form of oil and fat tar of black cotton oil 70-75

Dryer 1,5-2,5

White spirit 23.5-28.5 A binder is prepared by mixing black and cotton oil, tar oil, desiccant and white spirit for 20-40 minutes at ambient temperature.

The oil and fat oil of black-cotton oil is a waste product of the distillation of fatty acids of black cotton oils with an iodine number of not less than 101 and an acid number of not more than 90 mg KOH / g.

As a desiccant, it is preferable to use technical products NF-1 (GOST-1003-73) or 646. (TU 6-10-1351-78). When the fat-and-oil hydrone of black-cotton oil in the binder composition is below the lower limit, the strength in the dry state decreases, it rises above the upper limit in an undesirable degree, and the binder viscosity and hardening temperature increase.

In tab. 1 shows the compositions of the proposed binder 1-4 and binder 5 according to the well known technical solution 2.

For a comparative assessment of the properties of the binder 1-5, molding sands are prepared with the following content:

Quartz sand 1K02A (B) 95.61 Rod binder1, 95, Water2.44

The properties of core mixtures with binders 1-5 are given in Table. 2

As can be seen from the data table. 2, the binder according to the invention provides an increase in the strength of the rods and molds in a dry state and a reduction (by 25%) in the duration of heat drying.

The proposed binder has a high content of non-volatile substances and a low content of volatile substances, it is less toxic.

In the manufacture of the proposed binder, less scarce and cheaper ingredients are used.

Table 1

Fat oil black cottonseed oil

Desiccant NF-1 or 646

White Spirit

Tall fatty acids Yri drying time 210-220 ° C, h 0.75 Volatile matter content in the binder, wt.% Dry strength, kgf / cm 8.1-9.0 8.41J

75

75

1.5

2.5

43.0 23.5 22/5

Table 2 -8.0

S 9009316

Claims (2)

Formula for isoenia Waste in the form of oil-based GosSluschyu for the manufacture of foundry-on black-cotton rods and molds, cured oil 70-75 heat-drying, including the product Scaffold 1,5-2,5 disdilution of fatty acids from plant white spirit 23.5–28.5 body materials, desiccant and white spirit, Sources of information, the purpose of increasing the strength of rods and taken into account in the examination of forms in the dry state and reduction drying time, it contains. "1. Shpak P.P., Smooth S.I. Having applied the quality of the distillation product, the blue of the tall oil is used in the manufacture Tetic fatty acids from plant-casting rods. - Foundry raw material waste in the form of oil and fat production, 1959, No. 9, p. 21. th tar black cotton oil with - 2. Molding materials. Sat the following ratio of ingredients, edited by Prof. P.P. Berga. M., wt.%: 5Mashgiz, 1954, p. 111.