SU620057A1 - Cold-hardening mix ture for casting moulds and cores - Google Patents

Abstract

COLD MOLDING FOR MOLDING FORMS AND RODS, including a refractory filler, a thermoplastic binder, an organic solvent; toluene as an organic solvent, acetone as an organic diluent at the next ingredients blending, wt%: Thermoplastic binder — inden-coumarone resin1.0 - 3.0.0 Organic solvent —toluene 0, 5 -'1.5Organic diluent-acetone 0.5-1.5 Refractory refillOther (io

Description

SP

1 62005 The invention relates to foundry, namely to cold-solid mixtures, intended for the manufacture of casting molds and cores. Mixtures for the manufacture of casting molds and cores are known, which contain a refractory filler, for example, quartz sand, and a thermoplastic binder, polymeric polystyrene. However, this mixture requires heating to ensure its curing. The closest in technical essence and achievable technical effect to the described invention is a mixture containing inorganic materials, for example, quartz sand, thermoplastic binder polystyrene foam, organic solution-20, polymer and organic diluent. However, this mixture has an insufficient cure rate. The purpose of the invention is to intensify the mixture curing. It is reached-25

Content, May.%

Ingredient.

mziznir Sand quartz. 1K02A99,098,096,0 Ynden-coumarone resin 0.5, 1.02.0 Toluene 0,250,51,0 h Acetone 0,250,51,0

Compressive strength, kgf / cm

Cure time

inZ-IZ-IZ-IZ -

0,258,00,4 0,160,12 0,30

9.259.05.5 0.270.25 0.55

0,2511,510,5 1,6, 1,45,5

0.2511.513.5 10.3, 5.511.5

0.2511.514.5 14.58.514.5

0.2511.519.0 27.036.019.0 72 by the fact that, as a thermoplastic bond, the mixture contains an indene-coumarone resin, as an organic solvent is toluene, and as an organic diluent acetone in the following ratio of ingredients, wt.% : Thermoplastic binder - indene-coumarone resin 3.0 Organic solvent toluene 0.5 - 1.5 Organic diluent acetone 0.5-1.5 Refractory filler The remaining i 1-6 compositions of the proposed mixture are given in table. 1, its properties in. tab. 2. Table 94.092.0 96.0 3.04.0 2.0 1.52.0 2.0 2.0 1.52.0 Tabl and Cs 2 Preferred is the composition of the cold-hardening mixture, including wt.%: Flame-retardant filler Base Thermoplastic binder Eden-coumarone resin2.0 Organic solvent toluene1 O Organic diluent acetone .ON1.0 To obtain mixtures, a solution of inden-coumarone resin in toluene and acetone is prepared first. Toluene is used as a solvent for inden-maroon resin, and acetone serves as a solvent that lowers the boiling point of the mixture of organic liquids and thereby contributes to the intensification of the mixture hardening. Then, in a high-speed closed (to avoid intense evaporation of the liquid component) of the mixer, dry refractory filler is mixed with the resin solution. From tab. 2 follows that mixture 1 does not harden to cold and has low strength. Mixtures 2-5 are cured intensively, however, the curing rate for mixture 5 is significantly lower than for mixtures 2-4. For mixture 6 that does not contain acetone, the intensity of curing in the initial period is much less than that of mixture 3 similar to acetone. Those same data table. 2 confirms the feasibility of introducing, in addition to an organic solvent — toluene, an organic diluent — acetone, to the mixture and the optimality of the compositions of mixtures 2–4.

Claims (1)

COLD-MIXING MIXTURE FOR CASTING FORMS AND BARS, including refractory filler, thermoplastic binder, organic. ; solvent, organic diluent, characterized in that, in order to intensify curing, it contains inden-coumaron resin as a thermoplastic binder, toluene as an organic solvent, acetone as an organic diluent in the following ratio of ingredients, wt.%: Thermoplastic Binder - Inden-Coumarone Resin Organic Solvent Toluene Organic Thinner Acetone Refractory Filler 1.0 - 3.0 0.5 - 1.5 0.5 g Rest SU 6200 SP-M