SU1765133A1 - Method of preparation of mineral wool plates with enhanced rigidity - Google Patents

Abstract

The invention relates to the building materials industry used for thermal insulation of building structures and structures, in particular, by profiled flooring. SUMMARY OF THE INVENTION: The baked working solution of the binder is loaded into a forced-action mixer, where mineral wool is introduced with continuous mixing. The ratio of mineral wool: binder is 1:15. The resulting hydromass is poured into a 1000x500 mm mold with a mesh bottom or onto a mesh conveyor in the form of a carpet, and the excess binder is molded and removed by vacuuming with a vacuum of 500-600 mm of water to a moisture content of 50-60% and pressing to a thickness of 50 -80 mm. The evacuation time to a moisture content of 50-60% by weight is 3-5 minutes. The molded articles or carpet are heat treated (dried) by heating the core with a temperature of 150-180 ° C. The heat treatment time is 10-15 minutes. At a density of 208-270 kg / m, the plates have a compressive strength of 0.15-0.22 MPa, water absorption 18-25%, hygroscopicity 1.4-2.7%, water resistance 68-82%. 2 tab

Description

The invention relates to the building materials industry, in particular, to a method for manufacturing mineral reinforced slabs of increased rigidity used for thermal insulation of building structures and structures.

There is a known method of making minerals with increased rigidity, which includes preparing the binder, diluting it to the density of the working solution. Mixing the resulting solution with mineral wool, forming the plates and heat treating them.

The closest in technical essence and the achieved result to the concept is a method of making mineral-wool plates, including preparing an aqueous binder slurry, mixing the resulting solution with mineral wool, forming the plates and heat treating them in the following ratio of components, May% mineral wool 25.0- 40.0

askankol in the form of a 4% stable aqueous suspension of asgangel 4.0-8.0 water 48.5-65.0 sodium ethyl silicate 0.5-1.0 asbestos V grade 3.0-5.0 The known method is relatively environmentally friendly clean and does not cause contamination,

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nor the environment toxic emissions.

The disadvantages of this method are the duration of the binder preparation process and the low compressive strength of the plates.

The aim of the invention is to increase the strength of the plates and simplify the preparation of the binder.

The goal is achieved by the fact that in the known method of producing mineral-wool plates, including preparing a binder, diluting it to the density of the working solution, mixing the resulting solution with mineral wool, forming the plates and heat treating them, according to the invention, preparing the binder is carried out by emulsifying bitumen with a clay sorbent in an aqueous solution of liquid glass, and the plates are molded from a composition of the composition, wt.%

mineral wool 61,3-88,8

liquid glass2,2-7,7

clay0,2-0,4

bitumen 0.3-1.1

water8,5-29,5.

A comparative analysis with the prototype shows that the inventive method differs from that known by the new method of preparing the binder and by the new composition of the binder. Thus, the claimed technical solution meets the criterion of novelty,

An analysis of the known methods for producing mineral wool plates and binder compositions for their manufacture shows that the introduction of liquid glass, clay and bitumen into the composition of mineral wool plates is known (5-8). However, in the known technical solutions, the above components are used in the binder composition only. mineral fiber with a modulus of acidity higher than 0 (alkali free, kaolin, silica, high silica or quartz) or in combination with other components and do not provide the plates with the properties that they exhibit in the proposed technical solution, namely, the increased strength of the plates under compression and the shortening of the duration of the binder preparation process. This allows us to conclude that the proposed technical solution meets the criterion of significant differences.

For experimental verification of the proposed technical solution, five ingredients were made, three of which showed optimal results.

For the preparation of raw mixes in the examples of the proposed solution, mineral wool with a density of 75 kg / m produced by Minsk-Building Materials (GOST 4640-84, M 1.28), liquid glass (GOST 13078-81) with a density of 1.43 g / cm3 was used, BND bitumen, technical water. And the clay of the Kustikh deposit, the average composition of which is given in Table 1.

The preparation of the binder is carried out as follows: the necessary amount of water, liquid glass, clay is loaded into the dispersant and bitumen heated to 90 ° C is poured in with continuous stirring. In the course of further mixing for 5-10 minutes, the components interact with the formation of a complex binder consisting of a stable montmorillonite gel, silicic acid and a bituminous component. The resulting binder is diluted to a working solution density of about 1.05 g / cm. Then the dosed binder working solution is loaded into a forced action mixer, where mineral wool is introduced with continuous mixing. From the mass obtained by vacuuming, the products are molded and subjected to heat treatment by means of heat carrier fluids with a temperature of 150-180 ° C.

Liquid glass is a soluble substance and when impregnated with a fibrous material it is not filtered in a layer, and when evacuated as a result of surface tension it is deposited only at the points of contact of the fibers, carrying colloidal bitumen particles and montmorillonite gel. During the heat treatment of the plates, the binder is polymerized, making it possible to obtain elastic structures with a relatively high strength and a small binder content.

Examples of the method v properties of the obtained products are shown in Table 2.

From Table 2, it can be seen that the products obtained by the proposed method are 5–7 times better known for their strength properties, and the binder preparation time was reduced by 4 hours (27-54 times). It should be noted that the increase in the amount of binder (Example 1) leads to a difficulty in evacuating i / the corresponding increase in moisture of the raw material, an increase in the heat consumption for drying, an increase in density, and a decrease in moisture resistance. Reducing the amount of binder (example No. 5) leads to a decrease in strength characteristics.

Thus, when using the proposed method, the process of preparing a binder is simplified, excluding

The release of toxic substances both during the production of slabs and during their operation increases compressive strength, which makes it possible to use slabs as insulation in modern structures of roofs of profiled metal flooring.

Claims (1)

The invention The method of manufacturing a mineral wool plates of high rigidity, including the preparation of a binder, diluting it to the density of the working solution, mixing the resulting solution with mineral 0 wool, plate molding and heat treatment, characterized in that, in order to increase the strength of the plates and simplify the binder preparation process, the binder is prepared by emulsifying bitumen with a clay sorbent in an aqueous solution of water glass, and the plates are molded from the composition, wt. %: mineral wool 61,3-88,8 liquid glass2,2-7,7 clay0,2-0,4 bitumen 0.3-1.1 water8,5-29,5 The chemical composition of the clay raw materials of the Kustiha deposit Table 1 Table 2 Indicators of implementation Known examples of the proposed method method (prototype) lJlT2j If 3 V L I tf 17651338 Continuation of table 2 Examples of the proposed method lJlT2j If 3 V LI tf 5 soda ash 6) soda injection and dosing 7) holding at 100 ° C for 25-30 minutes