DD220299A1 - FLEXIBLE FLUID IMAGES FROM ALUMINUM SILICON FIBERS AND METHOD FOR THE PRODUCTION THEREOF - Google Patents

Abstract

THE INVENTION INVOLVES FLEXIBLE FLUID IMPORTS OF ALUMINUM SILICATE FIBERS AND A METHOD OF PREPARING THEM THAT MAKES THERMAL INSULATION IN ENERGY INTENSIVE METALURGICAL, CERAMIC AND CHEMICAL INDUSTRIAL WORKERS. THE OBJECTIVE OF THE INVENTION IS TO MANUFACTURE FLEXIBLE FLUID IMAGES WHICH, WHEN TEMPERATURE EXPOSURE, ACHIEVE THEIR FIXED DEFICIENCY AND THEREFORE ALLOW THAT THE CREATING OF CERTAIN FLUIDS IS CREATED BY PREPARATION OF PREPARED ELEMENTS. THE TASK WAS THUS SOLVED THAT FOR THE PRODUCTION OF FLAECHENGEBILDE BY WET TECHNOLOGY WITH SHEET EDUCATION ON ORGANIC RUECKSTANDSFREIAUSBRENNENDES BINDER, PREFERABLY RUBBER LATEX EMULSION, IS USED, THE ACTIVATION OF FASEROBERFLAECHE CAUSES THAT COULD CAUSE CONSOLIDATION OF THE DELIVERY STATE SOFT AND FLEXIBLE FLAECHENGEBILDES ALREADY AT 700 DEGREES CELSIUS starts. THE RESISTANCE IS AVAILABLE IN PARTICULAR FAIRS BY THE USE OF SILICONE ACID HYDROSOL.

Description

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Flexible sheet of aluminum silicate Fa sern and method, au. their production

Gsg applicatio of the invention _ebiet; ,

The invention relates to a method for producing V / On flexible fabrics made of alumihiumsilikatischen fibers, the heat insulation in energy-intensive work equipment - preferably on curved wings - as well as for the production of prefabricated elements änv; endbar are.

Characteristic of the known technical solution

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The known technical, solutions are characterized by the fact that for the production of products from ali-i miniumailikatischen fibers by a wet process un-; "Different" binders are used. Colloidal silica (US Pat. No. 3,077,413), colloidal silica and starch (US Pat. No. 3,224,927, British Patent No. 1506,152), colloidal silicic acid and flocculants (US Pat. No. 3,833,054), colloidal silica Silica and phenolic resines (Ind. Heat. 47 (1980) 5, S, 40} 42) ', polyvinyl acetate, clay and sodium alkyl siliconate (SU patent 666158), kaolin, carbamide resin, celluloic and glycolic acid sodium salt, organosilicon polymers (SU patent

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510458) and mixtures of resins and organosilicon compounds (US Pat. No. 4,294,879). The sheets of aluminum silicate fibers produced using these binders are characterized by high rigidity and lack of elasticity

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already in delivery condition and increasing strength at I ¹ emperaturbelästung marked. As a result, it is not possible to use these fabrics for thermal insulation on curved surfaces directly, without additional expenses for the production of plate strips, which would allow delivery of the curved surface, or to produce so-called wallpapering elements and other prefabricated components, in which a. The use of organic binders, especially of resins, necessitates the use of organic solvents and / or adhesion promoters, which complicates the technological process for the production of the fabrics by the use of organic binders, especially of resins, in order to compensate for the shrinkage by compression of the sheets perpendicular to the preferred layers of the fibers in the fabric high demands on the occupational, health and fire protection conditions.

Object of the invention . '\

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The object of the invention is, in contrast to the hitherto bekannteil stiff fabrics, to produce sheets of aluminosilicate fibers for a Waßtechnologie that remain flexible and flexible after drying and reach their ultimate strength under thermal stress in the application by surface effects of the fibers, which is desired by the users of the material, and which preferably in the manufacture of prefabricated components, a bias voltage for shrinkage compensation is possible or "the thermal insulation preferably curved surfaces is made possible in energy-intensive work equipment. V

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Object of the invention Is it made of aluminum silicate,. a molding, preferably in Plächengebilde produce, which is characterized by high flexibility and flexibility before temperature exposure and in the range of 700 ⁰ C - HOO ⁰ C, in particular in the range between 1000 ⁰ C and 1300 ⁰ C, the strength reaches or exceeds characterized the previously known fabrics, wherein the thermal conductivity of the material is not affected. Previously known solutions are characterized by the use of binders to rigid, solid lead and brittle sheets and do not allow delivery of curved surfaces with thermal insulation materials and insufficient preload perpendicular to the preferred positions of the fibers in the sheet _materials:

When using organosilicon binders and resins, complicating the technological process through the use of organic solvents is inevitable. .. '''"::'

In contrast to these known solutions, the invention is achieved in that a suspension is prepared from water, Kautschukuatexemuleion, precipitants and aluminosilicate fibers, wherein a flexible organic layer is applied to the fiber surface.

This surface layer causes the bonding of the Faserermateriels while maintaining the elasticity and flexibility in the delivery state and during the decomposition process of the binder under thermal stress, the formation of Zwiechenprodukten that lead to an activation of the surface as a prerequisite of solidification of the fibers, and thus a sufficient Ensure final strength. A substantial increase in strength is guaranteed from temperatures of 700 ^° C «

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In addition, the production process of the fabrics according to the invention differs by the number of raw material components to be used. The use of up to 5 different raw material components is known, according to the invention 3 different raw materials are used.

Due to the use of organic binders organic solvents and adhesion promoters are used, which leads to a high degree of complexity of the production process and high demands on health, occupational and fire protection, which is not required when using the inventive solution. '^; , , , ':' · ''. ' .. ^';', '. A further advantage of the process according to the invention is that can be applied per se known technology determining apparatus The method of manufacturing of fabrics made from aluminiumsilikatischen fibers is described as follows ben:..'''''.'' .. '-'":''.

In a suitable mixing unit ₉ preferably a turbocharger, from 100 to 400 l, preferably 200 l of water, 0.2 to 1.0 .1, preferably 0 ₉ 6 l of rubber latex emulsion, 0.2. 2.0 l, preferably 1.0 l of electrolyte solution as precipitant, preferably 5'-10% alum solution and 3 to 10 kg, preferably 4 kg of fibers produced the suspension according to the invention The mixing time is 2-10, preferably 6 minutes.

The dewatering of the suspension then takes place by means of suitable known suction devices, preferably a suction box with single sheet formation. The finished sheet having a residual moisture content of 30-80%, preferably:. 60%, wherein 60 to 200 ⁰ C, preferably 80 ⁰ C 01.10, dried "

The sheet according to the invention can now be converted into prefabricated construction stages without further technological stages.

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be processed by cutting, drilling and sawing and used directly for thermal insulation on curved surfaces.

For certain applications, which require flexibility against temperature stress and increased strength at temperatures above 700 ⁰ C, it is possible to add to the suspension * 0.05 - 0.5 1 »preferably 0.1 1, silica hydrosol. -

The inventively obtained fabrics are characterized in contrast to previously known materials by a flexibility, elasticity and flexibility in the delivery state and high strength from 700 ⁰ G in the use state, which is desired by the users of the material.

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Embodiments Example 1

The suspension according to the invention is made up of 200% water

0.6 1 butadiene styrene high polymer emulsion 1.0 1 10% alum solution 4000 g fibers

prepared, mixed for 6 minutes and after the Binzelblabbildung the Fläohengebilde at 80 - 100 ⁰ C dried.

Example .2 '... .-,. "''':'.'." , ^{; ;} ..''-; .:. , ' _:

The suspension according to the invention is made up of 200 l of water!

0.6 1 butadiene-styrene high polymer emulsion 0.1 l silica sol-hydrosol with 30 % solids content 1.0 1 10% alum solution

40o0 g fibers':

prepared, mixed for 6 minutes and after the single sheet formation, the sheet is dried at 80 - 100 ⁰ O dried.

Claims (6)

-. ; · · - 6 -. , \ '... · .-.,. .. --ν. :, '. invention claim 1 »Flexible fabrics.from aluminum silicate fibers and processes for their preparation, which differ 'from the known solutions obtained by the use of colloidal silica with additives, clay, polyvinyl. acetate and resins are characterized and lead to stiff, solid fabrics, or to fabrics according to a complicated, high demands on the working technology, distinguish, characterized in that the addition of an organic, residue-free burning binder, the during the manufacturing process of the fabric the fiber surface is deposited, the flexibility, elasticity and flexibility of the fabric guaranteed and occurs under thermal stress during the decomposition process of the organic: binder activation of the fiber surfaces, so that even at temperatures of 700 ⁰ C, a substantial solidification of the formerly flexible and flexible products used , 2. Method according to item 1, characterized in that rubber latex emulsions with a solids content of 20-80%, preferably 40-60%, are used as the binder. . ,, Method according to points 1 and 2, characterized in that to further increase the strength at a temperature load of more than 700 ° C with remaining flexibility in the state of delivery, silicic acid hydrosols with pesticide contents of 10-40%, preferably 25-35 % t in an amount from 1.5 to 15 %, preferably 2 to 6%, of the solids content. : 4 · Process according to items 1, 2 and 31, characterized in that suitable electrolyte solutions, preferably alum solutions, are used as precipitant. . 5 · Method according to points 1, 2, 3 and 4, characterized in that the drying of the fabrics at temperatures of 60 - 200 ⁰ C, preferably 80 110 ⁰ C, is performed. 6. Method according to the items 1, 2, 3 »4 and 5», characterized in that the dried fabrics ..- Without further technological steps for thermal insulation on curved surfaces used barely or by cutting, drilling or sawing for the production of prefabricated components can be used.