Novel glass fibre composition

Abstract

The invention relates to a glass fiber composition. The composition comprises the following compositions in percentage by weight: 58 to 65 percent of SiO2, 20 TO 26 percent of CaO, 9 to 17 percent of Al2O3, 0.5 to 1 percent of MgO, 0 to 5 percent of B2O3, 0 to 1 percent of F2, 0.1 to 1 percent of TiO2, 0 to 0.8 percent of K2O and Na2O, 0.1 to 0.5 percent of Fe2O3, and 0 to 0.6 percent of SO3. The glass fiber composition uses SiO2-Al2O3-CaO three-element system as basis, introduces MgO and B2O3 with low content, and reasonably designs the gross weight of alkaline metal oxides and the proportional relationship between the MgO and the CaO, not only contributes to the improvement of the mechanical strength, the high temperature resistance and the chemical stability of the glass, but also has excellent drawing performance; furthermore, the glass fiber composition has low cost in raw materials, and meets the requirement of environmental protection.

Description

(1) Technical field [0001] The invention relates to a glass fiber composition, in particular to a glass fiber composition with low magnesium and boron content. (2) Background technology [0002] E-glass, or alkali-free glass, is the most commonly used glass component for the production of continuous glass fibers. The base of the alkali-free glass composition is SiO 2 -Al 2 o 3 -CaO ternary system, which is a eutectic point composed of anorthite, pseudowollastonite and α-tridymite in equilibrium with the liquid phase in the ternary phase diagram, and its components and weight percentages are: SiO 2 62%; Al 2 o 3 14.7%; CaO 22.3%. On this basis, adding B to the glass composition 2 o 3 Substitute part of SiO 2 , MgO replaces part of CaO to form the now commonly used alkali-free glass composition. Its typical features are described in patents US2334981 and US2571074, which are generally SiO 2 -Al 2 o 3 -CaO-B 2 o 3 based on the quaternary system. The glass comp...

AI Technical Summary

Problems solved by technology

Excessive molding temperature and liquidus temperature will greatly increase energy consumption, and will also accelerate the high-temperature aging of the kiln and platinum bushing, thereby increasing production costs

Patent WO01 / 32576 describes a low boron glass fiber composition whose components also mainly include SiO 2 、Al 2 o 3 , CaO and MgO, in a preferred embodiment, the MgO content ranges from 1.5 to 4%, the glass fiber composition has a large ΔT value, and the molding temperature and liquidus temperature are not high, but the SiO 2 The low content (less than 58%) affects the mechanical strength of the glass to a certain extent

[0006] Glass fiber compositions with an MgO content of less than 1% are rare, and the few known patents all have certain problems and cannot well meet the needs of industrial production

For example, the patent WO00 / 73232 uses a glass fiber composition with an MgO content of less than 1%, which is mainly composed of SiO 2 -Al 2 o 3 -CaO ternary system composition, also added a certain amount of B 2 o 3 , Li 2 O, ZnO, MnO or MnO 2 , to achieve the purpose of reducing the molding temperature and liquidus temperature, but from the examples, either the molding temperature is still too high, or the ΔT value is far less than 50°C

And the raw material cost of this glass fiber composition is too high

As another example, the patent WO03 / 050049 describes a glass fiber composition suitable for automobile exhaust systems, which introduces less than 1% of MgO and higher than 1.5% of TiO 2 The purpose of improving acid resistance and high temperature resistance has been achieved, but due to the use of a large amount of TiO 2 , the glass fiber composition lacks cost advantages

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