Floride-free low-boron and alkaline-free glass fiber prescription and preparation method

Abstract

The invention relates to a glass fiber production prescription, in particular to an environment-friendly alkaline-free glass fiber prescription emitting less toxic gas. The prescription is characterized in that the components include SiO2, Al2O3, B2O3, CaO, MgO, K2O and Na2O2. Compared with the E glass fiber widely applied presently, the glass fiber prepared with the prescription of the invention is improved as follows: the raw material containing floride which is most harmful is completely abandoned and the raw material containing volatile boron is largely reduced, but the glass fiber of the invention still remains similar electric performance and mechanical performance. The invention is characterized in that an alkaline-free glass fiber using blast furnace slag as one of the main raw materials, realizing reduction of operation difficulty and great reduction of exhaust emission is preferential and can be produced directly in large scale in a tank furnace including an electric boosting structure. The use of an industrial raw material easy for melting and clearing, namely, the blast furnace slag, ensures the glass fiber to have similar operating performance as the E glass fiber and to adapt to large-scale production under the existing E glass fiber tank furnace production technology.

Description

technical field [0001] The invention relates to a fluorine-free, low-boron and alkali-free glass fiber composition and a preparation method. In particular, it is designed to match the application of industrial by-products on high-performance fibers, and also involves less harmful gas emissions and environmentally friendly glass fiber formulations. Background technique [0002] The most widely used glass fiber composition is alkali-free glass fiber, commonly known as "E glass". With the increasing application of glass fiber, E glass fiber can no longer meet the needs due to its weaknesses such as poor acid corrosion resistance. Moreover, E-glass fiber contains more flux components, and currently the most effective and widely used are fluorite and boron compounds. The alkali-free glass fiber formulations commonly used at present all contain about 1% F 2 and 6-8% boron oxide. When melting alkali-free glass due to F 2 with SiO 2 Combined with being extremely volatile, more...

AI Technical Summary

Problems solved by technology

As mentioned in a domestic patent, the glass fiber produced by the glass component is the same as the E glass, which greatly reduces the B in the glass fiber component. 2 o 3 content, which reduces the introduction of expensive elements and reduces the volatilization of boron, but does not remove the fluorine-containing compounds that are more harmful, and the melting temperature is high, so it is difficult to produce in the original E glass fiber production line

The glass fiber composition described in the boron-free glass fiber patents that have been reported abroad is completely boron-free but still contains a small amount of fluorine, and because it completely removes the B of flux and reduces high-temperature viscosity 2 o 3 , under the existing production conditions of E glass, glass clarification is difficult, operation is difficult, production cost is high, and even if the furnace design is improved, the difficulty of glass melting seriously affects its yield