CS241334B1 - Glass stem suitable for E-glass production - Google Patents

Abstract

The solution concerns a glass strain suitable for the production of E-glass, characterized by improved fusibility and claribility, while the enamel fused from it has properties that meet the standards for E-glass. In addition to the above. the use of glassware excludes the use of environmentally harmful and poisonous raw materials. Glass stock suitable for the production of E-glass contains, in addition to glass sand, kaolin, limestone and/or dolomite, aluminum oxide or hydrate and raw materials introducing boron oxide, 1 to 40% of the weight of the blast furnace slag and at least one of the sulfates of non-alkali metals from the group of zinc, calcium, barium and magnesium.

Description

241334

BACKGROUND OF THE INVENTION The present invention relates to a glass batch suitable for the production of E-glass on fiber-reinforced glass, to improve its meltability without the deterioration of the glass fiber, which is important for the production of glass fibers and the further use of glass fibers.

The known and used glass batches for E-s, klo consist of conventional glass compositions, such as aluminum, sand, oxide or hydrate, kaolin, limestone, dolomite, boron oxide, optionally coilemanite, and the like) from the sodium sulphate alcoholic sulphate strain, arsenic or fluorspar. The proportions of the raw materials in the batch are determined according to their composition so that the enamel melted has the properties prescribed by the standard.

The E-slope is the most abundant stop for water, alkali, acid and resistivity at 250 ° C due to the use of glass fibers produced by such glass for electro-optical purposes. Indeed, the properties are indicated by alkoinformation. Within this limitation, it is possible to vary both the composition of the strain as well as the composition of the glass and its properties. Particularly desirable are the changes that will allow the consumption of imported raw materials and the cost of the strain to be improved, the meltability and degassing being improved, the refractive index of the glass to be nD = 1.5) 60 to 1.568 relative to the use of E-glass laminates. At the same time, all of the accomplishments were not achieved by the known and used stem assemblies.

The above-mentioned drawbacks are eliminated by the glass pane suitable for E-glass on the basis of glass sand, kaolin, oxide or hydrate of aluminum, limestone and / or dolomite and the boron oxide feedstock according to the invention, which is characterized in that it contains 1 to 40% the weight of the blast furnace slag and at least one of the non-alkali metal sulphates of the zinc, calcium, barium and magnesium groups in such a ratio that the reduction capacity of the slag slag and the oxidation power of the non-alkali metal sieve equalize the total redox number to +15 to -10.

The use of a glass batch of suitable E-glass production according to the invention provides benefits and advantages. The main effect is that, while the blast-furnace slag and non-alkali metal sulphate are used, the meltability and degassing of the melt is improved, so that the reserve in these important properties can be utilized to reduce the boric acid addition, thereby reducing the stem price. since said ingredients are secondary raw materials.

The environmental protection of the invention is of considerable importance because the sulfur sulphide system used will eliminate the use of environmentally harmful raw materials such as chicory and poisonous raw materials such as arsenic. Another advantage important for the production is that it is possible to form a calcium oxide and a magnesium oxide CaO: MgO, whereby the oxide is present. at the same time, the CaO: MgO ratio at the quartz eutectic value of the calcium oxide-magnesium oxide-aluminum oxide-silicon oxide, CaO-MgO-Al2O5-S1O2 is reduced, thereby reducing the viscosity of the melt, the heat those liquidus and crystallization speed.

It has also been shown that the theoretical heat demand for melting is reduced by the use of a high slag slag according to the invention. The common effect of the glass batch of the invention is that the glass's guiding properties meet the standards and properties of technology! they are the same or better than the standard.

A particular embodiment of the invention always requires the conversion of the reduction / reduction ratios in the strain which determines a suitable ratio of blast furnace slag as a reducing raw material and non-alkali metal sulfate as the oxidizing raw material.

The selected batch of blast furnace slag is multiplied by the slag redox factor, which is titrated by the titration method and moves about 0.1, typically. The negative value of this multiple is equal to the positive value obtained by multiplying the weight and the redox factor of the oxidizing raw material. The resulting redox number of the strain then has a value close to zero and the range at which it is preferred to work is +15 to -10.

The glass batch needed for the melting of 1Et-glass was prepared from 290 kg of glassware, 170 kg of blast furnace slag, 389 kg of cocaine, 246 kg of limestone, 22 kg of crystalline zinc sulfate, and 107 kg of acidborate. The redox-blast furnace factor, determined at -0.09 and the zinc redox redox factor at +0.329, almost counteracts their mutual effect. Moreover, since the raw materials did not contain technically significant amounts of oxidants or reductants, the total redox number of the strain is within the desired range of +15 to -10. From this strain bare by the known method and under the same conditions as the strains used in the production of E-glass melted glass composition: 53.5% by weight. % silica, .15.4; % alumina, 5.8 wt. of boron oxide, 0.22 wt. % iron oxide, 20.6 wt. calcium oxide, 2.1 wt. of magnesium oxide, 1.2 wt. zinc oxide, 0.2 wt. % sodium oxide, 0.6 wt. % potassium oxide and 0.316 wt. titanium dioxide.

Claims (1)

SUBJECT A glass batch suitable for the manufacture of E-glass based on glass sand, kaolin, aluminum oxide or hydrate, limestone and / or dolomite and boron oxide-containing feedstock, characterized in that it contains 1 to 40% by weight of blast furnace slag and at least one of sulfur of zinc, calcium, barium and magnesium in a ratio such that the blast furnace slag reduction ability and the non-alkali metal sulfate oxidizing capacity of the non-alkaline metal sulphate equaled the total glass-redox number to +15 to -10.