SU1728149A1 - Glass for glass fibers manufacturing - Google Patents

Abstract

This invention relates to the manufacture of heat insulating materials from glass staple fibers. In order to reduce non-fibrous inclusions, fiber diameter and thermal conductivity coefficient, glass has the following composition, wt.%: SI02 52.65-56.85, ABO3 5.9-7.5. Рв20з 1.3-1.6, CaO 16.8-19.4, MDO 5.0-8.3, Na20 11.5- 13.0, S 0.03-0.16. The content of fibrous inclusions is 2.5-3.5%. The average fiber diameter is 9.8-12.8 µm, the coefficient of thermal conductivity of the heat insulating material at 25 + 5 ° C is 0.02-0.04 kcal / m-h. 2 tab. .

Description

The invention relates to the glass industry, to glass melting, and can be used in the preparation of heat insulating products from glass staple fiber.

. Non-alkaline glass compositions for the production of glass staple fiber based on charge materials containing 51–65 kg of alumina, carbonate CaO –MDO-containing raw material 0.1–2.5 kg, and the rest of the quartz wood is known.

Glass fiber based on such a mixture has a high mechanical strength. Products made from such fibers can be used as heat insulating materials when operating at high temperatures. However, to cook such a mixture requires a high temperature (above 1650 ° C), which drastically reduces the possibility of its production.

Sodium-calcium-silicate glass compositions for the production of thermal insulating materials from glass staple fibers, containing, in wt%, are also widely known: 810,256.0-59.1; A120z + Re20z 4.1-9.0; CaO 16.0-22.0; MDO 4.0-6.0; №20 11.0-13.0.

Blends based on traditional raw materials, of the following composition are used for melting glasses:

Quartz sand32.0-38.0

Nepheline9.0-22.0

Dolomit15,8-32.0

Mel4.1-18

Soda5,4-10.

Sulfate 1.5-5.2

Coal0.07-0.31

The cooking temperature of such charges is much lower and amounts to 1350-1400 ° C. However, glass melts based on such charges have a high surface tension, especially in the temperature range of production (1280-1320 ° C), which contributes to the formation of non-fibrous inclusions (beads) and prevents the stretching of the fibers. This is a major deterrent to the increase in speed.

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t givaniya staple fiber, increase productivity.

In addition, with an increase in the number of non-fibrous inclusions and fiber diameter, the thermal insulating properties of staple-fiber products deteriorate sharply, for example, their thermal conductivity increases.

The aim of the invention is to increase productivity, reduce non-fibrous inclusions and the diameter of glass staple fibers in the production of heat insulating materials.

The goal is achieved by the fact that the composition of the glass, including SI02, ALOS. Rv20z CaO, MgO and No. 20, bivalent sulfur (S) is additionally introduced in the following ratio, wt.%: S102 52.65-56.85; 5.9-7.5; Rv20z 1.3-1.6: SeO 16.8-19.4; MgO 5.6-8.3; No. 20 11.5-13.0; S11 0.05-0.15.

In this case, divalent sulfur is introduced into the glass by means of gas cleaning dust of the following chemical composition, wt.%: SI02 5.3-7.8; A120z + Re20z 5.8-7.8; CaO 32.7-43, 2; MgO 19.6-24.0; 5 GDO, 9.

Gas cleaning dust is a waste of fluxy burned dolomite (roasting temperature 1650-1800 ° C) and is a fine powder with high reactivity.

In the process of high-temperature roasting, a new mineral composition of dolomite is formed with a new structure.

The mineral composition of gas cleaning dust is represented by highly active phases of CaO and Ca (OH) 2, as well as ready-made silicates of 54CaO 16.55U2 A120z MDO; SazZoE, which enter into solid-phase reactions with the components of the charge, starting with the preparation process.

The sulfide sulfur (S) present in dolomite at a high temperature builds up into a structure and converts the dolomite to a surfactant component. Due to this, when the gas cleaning dust is introduced into the mixture, the physicochemical properties of the melt change significantly, in particular, the surface tension is significantly reduced. By reducing the surface tension of the melt, it is possible to significantly increase the productivity of glass staple fiber while reducing the number of non-fibrous inclusions and fiber diameter. In addition, the introduction of a new component

contributes to an increase in the charge of brewing and clarification of glass mass, which is an essential factor for increasing the homogeneity of glass mass, which

positive effect on fiber drawing process.

For the experimental verification of the proposed composition, 5 charges were prepared, of which 3 charges showed optimal results (see Table 1). The glasses were cooked in a crucible furnace and in an industrial continuous furnace at 1380 ° C.

When tested under industrial conditions, the production of thermal insulation products from glass staple fibers was made using the vertical blow-up method (RTG).

The compositions and properties of glasses are given in table 1.

In tab. 2 shows the chemical composition of raw materials.

From tab. 1 and 2, it follows that the use of the glass (1, 2, 3) in order to obtain glass staple fiber

allows to reduce the number of inclusions by 2-2.5%, i.e., by 1.5-2 times, to reduce the diameter of the stretchable fibers by 2.5-3.7 microns, to increase the output of thermal insulation products by 25-35%. With this output ready

glass of charge increases by 3.3-7.3% and the cost of 1 ton of charge decreases by 2.8-4.1 RUB.

For the glass compositions in the exorbitant areas of the components (compounds 4 and 5), there was no significant improvement in performance in accordance with the intended purpose. Thus, while reducing the input of gas cleaning dust (composition 4), the amount of non-fibrous inclusions decreases slightly.

(1.5%), with an increase in-homogeneity of the glass decreases and the performance at the same time practically does not increase. Forum and Glass for glass fiber,

including SI02, ALOZ, Rv20z. CaO, MgO, No. 20, and S, that is, with. In order to reduce non-fibrous inclusions, fiber diameter and heat conductivity coefficient, it contains the specified components in the following ratio, wt.%:

SI0252.65-56,85

A 20z5.9-7.5

Re20z1.3-1.6

CaO16,8-19.4

MgO5.0-8.3

Table

Table 2

Claims (1)

Claim Glass for fiberglass, including SIO2, AI2O3, BegOz. CaO, MdO, NaGOi S ¹ , characterized in that, in order to reduce non-fibrous inclusions, fiber diameter and thermal conductivity, it contains these components in the following ratio, wt.%: SIO ₂ 52.65-56.85 AI2O3 5.9-7.5 RunningOf 1.3-1.6 CaO 16.8-19.4 MgO 5.0-8.3 Table! Components and indicators The content of the components and the values of indicators in the compositions 1 eleven 3 1 ' ] ’ | Famous Glass composition, oil: SiO _a . 52.65 56.85 55.3 52.17 58.1 53,4 • ^Α1 4θ3 7.5 5.9 6.5 8.4 4.3 8.1 Fe ₂ 0, 1,6 1.3 1,6 1.4 1.7 1,0 Cao 1b, 8 19,4 17.8 20.5 16,2 16,2 MgO 8.3 5,0 6.6 8.5 8.3 Najo 13.0 11.5 12.1 13.5 11.0 13.0 s' 0.15 0.05 0.1 0,03 0.2 - The composition of the charge, woods 36.5 35.7 34.2 31.6 27.7 '32.9 nepheline 17.8 19.9 19.7 20.9 17.7 20,0 a piece of chalk 1,1 15.4 8.1 21.0 0.2 5,6 DOLOMITE - -. '' . -  - 30.3 gas cleaning dust-- ' 31.8 19,4 26.5 15.7 32,7 soda 8.9 7.6 8.0 5.7 10 * 8 9.5 sulfate 3,7 ''9 3.3 4.8 . ° ’9 1,6 coal 0.2 0.1 0.2 0.3 - 0.1 Glass exit from the charge 80.6 81.5 84.6 82.8 81.1 77.3 The content of fibrous inclusions,% 2,5 3.0 2,5 3,5 3.5 5,0 The average fiber diameter, microns 9.8 11.0 10.5 . 13.0 12.8 . 13.5 The coefficient of thermal conductivity (25i5 * t) of the insulating material, kcal / m "h. 0,03 0.02 0,03 0.04 0,038 0,047 Productivity of heat-insulating metal, m ’. 430 410 430 350 360 320. Glass uniformity, LS .’s 1,5 2.0 2,5 3.0 .4,5 5,0 The cost of 1 ton of charge, rub . 14,4 13.1 13.9 13.3 14.3 17,2 Table 2 Raw materials The content of oxides, wt.% SiOz AI2O3 F2o3 CaO MDO No. gO S FROM Sand Nepheline Chalk Dolomite ordinary Dust gas treatment Soda Sulfate Coal 97.83 43.22 7.45 6.85 0.4 0.97 28.48 1.38 2,55 0.12 3.44 0.24 1.72 1.55 49.62 42.56 0.27 0.49 0.64 20.66 0.14 21.09 1.3 57.6 41,4 0.16 85.0