SU1363614A1 - Composition for making foundry cores and moulds hardened by blasting with agent containing sulfurous anhydride - Google Patents

Abstract

The invention relates to a foundry, in particular, to mixtures for making rods (C) and molds (F), cured in cold equipment by blowing gas reagents with a sulfur content in them. The invention relates to foundry, in particular, to mixtures used to make rods and molds cured in cold tooling by purging with gas reagents containing sulfuric anhydride in them (50 is a process). The aim of the invention is to improve the quality of the rods and shapes by increasing their strength in a curable state. The essence of the invention is as follows. anhydride (SO 3 - process), the purpose of the invention is to improve the quality of C and F by increasing their strength in the solidified state. The composition of the mixture, wt.%: Triethylene glycol dimethacrylate (product TGM-3) 0.30-5.00; hydroperoxide (for example, cumene hydroperoxide) 0.01-1.00; ethyl silicate 0.01-1.00; quartz sand else. An example of a gas curing agent can serve as a mixture of 2 vol. SO / g and 98 ob.ch. nitrogen. The duration of the blowdown 0.1 s, the dwell time of the mixture in the equipment after purging 30 s, the purge pressure of 2.5 MPa. Due to the additional introduction of ethyl silicate, an increase in the strength of C and F in the cured state is achieved by an average of 1.5 times, which makes it possible to reduce the binder content in the composition of the mixture and thereby improve the sanitary and hygienic labor conditions on the core and molding areas. foundries. 3 tab. (L As a triethylacrylate dimethacrylate, it is intended to use a technical product of the TGM-3 brand. An example of hydroperoxide is cumene hydroperoxide. The following order of introduction and mixing of ingredients is observed during the preparation of the mixture. A certain amount of TGM-3, hydroperoxide and ethyl silicate are weighed and thoroughly stirred (5-10 min.) Then the runners are loaded with quartz Ode: 00 05

Description

sand and TGM-3 was added containing hydroperoxide and ethyl silicate. The resulting mixture is stirred up 2.5 missions,

Table 1 shows the compositions of pre-agaeulk mixtures 1-3,

Table 1

ri-

..

0.3 2.0 5.0

0.01 0.12 1.0 0.0 0.10 1.0

99.68 97.78 93.0

Otecb, inclusive, hydrrp.

The river and the etcliclate are transferred from the vessel in a manner that equips the temperature to a medium and then, with the purpose of an opening and mixing, pass a gaseous mixture of sulfuric anhydride and nitrogen through the latter for a predetermined time.

An example of a curing mode by purging with a gas reagent is listed in Table 2,

Table 2

JQ Mode specifications

Indicators

Equipment temperature. . .

5 The duration of the purge gas mixture (SOi: N2 2:98 by volume, with

0 Soaking time in a snap, with the pressure of the purge, these,,.,. ..

Ambient temperature

0.1

thirty

2.5

2S Table 3 shows the mechanical properties of mixtures 1-3 according to the present invention,

T a b c a 3

Claims (1)

Claim A mixture for the manufacture of foundry cores and molds, cured by blowing 45 reagent containing sulfur dioxide, including quartz sand, triethylene glycol dimethacrylate and hydroperoxide, with the exception that, in order to improve the quality of the rods and molds by increasing their strength in the cured state, it additionally contains ethyl silicate in the following ratio of ingredients, wt., 2: 55 Triethylene glycol dimethacrylate 0.30-5.00 Hydroperoxide 0.01-1.00 Ethyl silicate 0.01-1.00 Quartz sand Rest,