RU2288201C2 - High-temperature glue composition - Google Patents

Abstract

FIELD: production of refractory articles.

SUBSTANCE: high-temperature glue composition comprises, in mass %, fine grinded refractory filler as the base, 1.0-10 of carbon-containing material, 5.0-15.0 of powder-like phenol binder, and 15-21.2 of ethyleneglycol. The composition could also comprise , in mass %, 0.1-5 of boron carbide and/or nitride, 0.1-5 of organic or inorganic micro-reinforcing fiber filler, and 0.5-10 of pitch.

EFFECT: enhanced high-temperature strength.

4 cl, 1 tbl

Description

The invention relates to the refractory industry, and in particular to compositions of a high-temperature adhesive composition, which can be used to connect refractory products, including carbon-containing, when performing the laying of the lining of metallurgical units.

Known sealing refractory material composition, wt.%: Fireclay 65-84, liquid phenol-formaldehyde resin 15-30, asbestos 1-5 (AS USSR 1004311, MKI C 04 V 33/22).

The disadvantage of this material is the low refractoriness associated with the use of chamotte as a filler, and high viscosity at low temperatures, which complicates its use in the cold season.

Known cement, which is made from a mixture containing, wt.%: Fused silica 0.05-10.0, silicon 5.0-20.0, carbon substance 30.0-40.0, phenolic resin novolac type with hardener 40 -60 (application No. 56-125278, MKI S 04 V 35/66, Japan).

The mixture is plasticized with vegetable oil (0.5-0.8 parts by weight per 1 hour of cement powder). The oil evaporates before the carbonization of the phenolic resin in refractory cement. Refractory cement is used as an adhesive composition for carbon-containing bricks when lining furnaces of metallurgical units.

The disadvantage of this cement is the use of fused silica in the mixture and low metal resistance in contact with the molten steel. Such cement is not intended for use in refractory lining of the main chemical composition.

Known mortar recommended for use in the construction of linings made of periclase-carbon products, mortar is made on a phenolic resin, contains wt.%: MgO - 91, SiO ₂ - 2, scaly graphite - 2 (The use of mortars on a resin binder for bricks of the MgO-C / system Nakatanii Fumioo // Taikabutsu = Refractories / - 1988. - 40, No. 10. - P.594. - Japan).

The disadvantage of this mortar is the low high-temperature strength and low resistance to oxidation of the seam, a significant increase in viscosity with a decrease in temperature, which does not allow its use in the cold season.

Closest to the proposed invention in terms of composition and technical nature is mortar (EP 0758632, class C 04 B 35/66), which includes a refractory filler, pitch, carbon fibers, sodium silicate and additives.

The disadvantage of this mortar is that the additive uses low-melting sodium silicate (sodium silicate), which leads to a significant decrease in the fire resistance of the mortar.

The objective of the invention is to increase high-temperature strength, increase resistance to oxidation of the seam, improve the technological properties of the adhesive composition.

The specified technical result is achieved by the fact that the proposed composition of the high-temperature adhesive composition includes a finely ground refractory filler, carbon-containing material, contains as a binder a powdery phenolic binder of the novolac type with a hardener, which has a molecular weight of not more than 2000, and ethylene glycol as a solvent in the following ratio, wt.%:

fine refractory filler the basis carbon material 1.0-10.0 the specified powdered phenolic binder 5.0-15.0 ethylene glycol (in excess of 100% charge) 15.0-21.2

To improve the performance characteristics specified in the invention, the composition may additionally be introduced, wt.%:

organic and / or inorganic micro-reinforcing fibrous filler 0.1-5.0 boron carbide and / or nitride 0.1-5.0 pitch 0.5-10.0

To compare the properties of the high-temperature adhesive composition and mortar according to the prototype, they were prepared as follows.

Example

An adhesive composition according to the invention (see table) and a mortar according to the prototype were prepared by mixing the initial components of the mixture to a homogeneous consistency in a Z-shaped mixer in the proportions indicated in the formula of the invention.

To determine the shear strength at room temperature, periclase-carbon substrates were prepared, glued together, and then heat treated at 200 ° C.

To assess the mobility of the solution of the composition and mortar at low temperatures, they were applied to carbon-containing refractory products with a spatula at a temperature of the substrate and mortar (composition) of -5 ° C. Upon receipt of an even layer and good wettability of the product surface, mobility was assessed as good, with poor wettability and coagulation of mortar (composition), mobility was assessed as unsatisfactory.

Table
The composition of the charge No.
The name of the components of the charge and physico-mechanical properties Composition, wt.% Prototype one 2 3 four 5 6 7 8 9 10 eleven 12 13 fourteen one Sintered periclase, wt.% 94 75 - - - - - - 93.5 65 93.9 70 93.9 70 - 2 Fused periclase, wt.% - - 94 75 93.5 70 - - - - - - - - - 3 Aluminum Magnesium Spinel, wt.% - - - - - - 93.9 70 - - - - - - - four Alumina - - - - - - - - - - - - - - 95 5 Clay - - - - - - - - - - - - - - 5 6 Carbon fiber (St. 100% charge) 0.06 7 Sodium silicate (St. 100% charge) 2,5 8 Graphite one 10 one 10 one 10 one 10 one 10 one 10 one 10 - 9 Phenolic Binder Powder 5 fifteen 5 fifteen 5 fifteen 5 fifteen 5 fifteen 5 fifteen 5 fifteen 10 Boron carbide - - - - 0.1 5 - - - - 0.05 2,5 - - - eleven Boron nitride - - - - - - 0.1 5 - - 0.05 2,5 - - - 12 Ethylene glycol (St. 100% charge) 21,2 fifteen 21,2 fifteen 21,2 fifteen 21,2 fifteen 21,2 fifteen 21,2 fifteen 21,2 fifteen 13 Pitch - - - - - - - - 0.5 10 - - - - 6 fourteen Mullite-siliceous fiber 0.1 5 fifteen Shear strength at room temperature, N / mm ^{2 *} 2,8 3.07 3.0 4.1 3.2 4.2 3.2 4.2 2,5 3.0 3,5 4,5 3.3 4.3 0.8 16 Shear strength at room temperature after heat treatment in air at 800 ° C, N / mm ^{2 **} 0.45 0.5 0.55 0.6 2.2 3.0 2.2 3.0 2.2 3,1 2,3 3,1 2.0 3,1 0.4 17 The mobility of the solution at
(-5) ° C ^*** "+" "+" "+" "+" "+" "+" "+" "+" "+" "+" "+" "+" "+" "+" "-" ^* Samples of connected products were pre-heat treated in air at 200 ° C for 2 hours.
^** Samples of connected products were pre-heat treated in air at 200 ° C, and then at 800 ° C for 2 hours.
^*** “+” is well applied to carbon-containing products at a temperature of -5 ° C and below, “-” is poorly applied to carbon-containing products at a temperature of -5 ° C.

The table shows that the adhesive composition has high shear strength and good mobility at low temperatures, which is a determining factor when using the composition in the cold season. The mortar of the prototype is destroyed when testing the weld shear at 800 ° C and has poor mobility at low temperatures, which does not allow its use in the cold season.

Thus, the proposed technical solution has a significant novelty, usefulness and technically feasible.

Claims (4)

1. The composition of the high-temperature adhesive composition, including a finely ground refractory filler, a carbon-containing material, a phenolic binder, characterized in that a phenolic powder binder is used as a binder, and ethylene glycol is used as a solvent in the following ratio, wt.%: Fine refractory filler The basis Carbon material 1.0-10.0 Powdered Phenolic Binder 5.0-15.0 Ethylene glycol (over 100% charge) 15-21,2 2. The composition of the high-temperature adhesive composition according to claim 1, characterized in that it further comprises boron carbide and / or boron nitride in an amount of 0.1-5 wt.%. 3. The composition of the high-temperature adhesive composition according to claim 1, characterized in that it further comprises an organic and / or inorganic micro-reinforcing fibrous filler in an amount of 0.1-5 wt.%. 4. The composition of the high-temperature adhesive composition according to claim 1, characterized in that it additionally contains pitch in an amount of 0.5-10 wt.%.