SU620468A1 - Method of manufacturing heat-insulating material - Google Patents

Description

The invention relates to eblasgi building materials and can be used in the manufacture of high-temperature thermal insulation based on mineral fiber and ceramic binder.

Methods are known for the manufacture of a heat insulating material based on mineral fiber (mineral wool, glass wool, kaolin and asbestos fiber, etc.) and various binders (starch, water glass, cement, etc.). All these methods include, after molding or during the molding process, hardening with the aim of curing the binder ij, | 2J, 3 and f4J. Heat treatment of the material, for example, based on asbestos and magnesium trigndrocarbonate, is carried out at 550-600 C for 4-6 hours. The fiber in the above-mentioned methods is, as a rule, an inert filler. The heat resistance of a material mainly depends on the type of binder, which usually breaks down at lower temperatures than high-temperature fiber.

The closest in technical essence to the invention is a method of manufacturing a heat insulating material based on mineral fiber and a ceramic binder by molding, drying and calcining 5J.

The firing according to this method is carried out at a temperature below the recrystallization temperature of the vodokn. In the firing process, the associated water is subsequently removed, the clay passes to the pyroplate plate state and sintering. In this case, the fibers are bound in a rigid product with compressive strength of 3.5–9.0 kgf / cm. The temperature resistance of the material obtained is due to the type of fiber, because refractory clays used have a high temperature resistance.

The disadvantage of this method is the need for a prolonged 4-6 hour) cutting.

The purpose of the invention is to reduce the duration of calcination and increase the temperature resistance of the material. 3 This is achieved by the fact that the calcination is carried out at a temperature higher than the recrystallization temperature of the mineral fiber by 5 ° –150 ° C. The material is made from kaolin or мн mineral (Clay and clay binders. Clay and fiber in all cases). x is taken in a 1: 1 ratio, Bofly is introduced in an amount of 25% by weight of dry components. Samples are dried and formed at 150 ° C and fired at a temperature below the recrystallization temperature of the fiber (example 1) and higher at 50, 130, 15 ° C (examples 2, 3, 4, respectively). Example. A leached billet of refractory clay and AO fiber with a recrystallization temperature of 115 ° C, is burned at a temperature of 1100 ° C. The resulting material has a heat resistance of 110 ° C. Example 2. The same billet is roasted at a temperature of 12OO for 3 hours. The resulting material has a thermal resistance of 12OO C. e p 3. The same billet is burned at a temperature of 1280 ° C for 2 hours.The resulting material has a heat resistance of 128 ° C. EXAMPLE 4. A dried billet of fusible clay and mineral wool with a temperature resistance of 700 C is fired, at 850 ° C 1.5 hours received by the mother l has a heat resistance of 850 C. Preparation of fibrous thermal insulation for ceramic binders proposed method provides increased thermal stability at 50-150 ° C, wherein the expandable region of their use. The heat treatment time is reduced from 1-3 hours, which contributes to an increase in production of aggregates. The implementation of the proposed method will allow expanding the raw material base due to the use of fusible clays and low-temperature fibers. On the basis of these x4 components, a material with sufficient strength and low deformability can be made. Increasing the firing temperature will create optimal conditions for sintering refractory clays and increase the strength of the products. . The economic efficiency of the implementation of the proposed method is due to the intensification of the process of high-temperature processing, increasing the heat resistance of products, as well as the possibility of using cheaper and more common raw materials. The expected economic effect from the introduction of the proposed invention is 1.5 rubles, per. 1m . Foamy of the Invention A method of manufacturing a heat insulating material based on mineral fiber and a ceramic binder by molding, drying and calcining, in that, in order to reduce the duration of the calcination and increase the temperature resistance of the material, the calcination is carried out temperature higher than the recrystallization temperature of the mineral fiber by 50-150 tJ. Sources of information5 taken into account during the examination: 1. USSR author's certificate No. 179214, cl. From 04 to 43/02, 1964 2. USSR author's certificate No. 300446, cl. From 04 to 43/02, 1969. 3. USSR certificate of the USSR No. 375276, class, From 04 To 43/02, 1971. 4. Author's certificate of the USSR No. 405848, class. C O4 B 43/02, 1971. 5. USSR author's certificate No. 570575, C, C 04 B 43/02 1975.