Boron-free glass fiber composition

Abstract

The invention discloses a boron-free glass fiber composition, comprising the following components, based on SiO2, Al2O3, CaO, MgO, Fe2O3, Li2O, Na2O and K2O, by weight: 57.5%<= SiO2<59%, 13-16% of Al2O3, 23-25% of CaO, 1-1.5% of MgO, 0.1-1% of Fe2O3, R2O=Li2O+Na2O+K2O<1.5%, and K2O>0.2%, wherein Li2O is no less than 0, and when Li2O is no less than 0.1%, a ratio of K2O to Na2O is higher than 1. The glass fiber composition provided by the invention not only can obviously decrease the crystallization tendency of boron-free glass and improve the forming performance of the boron-free glass fiber, but also can obviously reduce surface tension of high temperature molten glass, and improve the melting properties of the boron-free glass.

Description

(1) Technical field [0001] The invention relates to a glass fiber composition, in particular to a boron-free glass fiber composition with excellent fiber forming properties. (2) Background technology [0002] E-glass, or alkali-free glass, is the most commonly used glass component for the production of continuous glass fibers. With the development of science and technology, higher and higher requirements are put forward for the performance of glass fiber reinforced composite materials, which also requires better performance of glass fiber. Due to the high content of boron and fluorine, the structural skeleton of traditional E-glass fiber is relatively loose, and its mechanical properties are poor. It has been difficult to meet the requirements of wind power blades, high-performance FRP pipes and automobile manufacturing. At the same time, the high content of boron and fluorine also leads to the disadvantages of traditional E-glass fiber, such as high raw material cost and g...

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Problems solved by technology

Some related patents disclosed at home and abroad do not contain boron and / or fluorine, such as the typical invention CN96194508.7, the preferred version of this invention does not contain boron and fluorine, but there is no mention of how to improve glass melting and Difficult technical solutions for fiber forming, which is very difficult for large-scale production in tank kilns

Aiming at how to effectively reduce the difficulty of glass melting and fiber forming, some patents provide a series of improvement measures, such as adding ZnO and TiO with a weight percentage higher than 3%. 2 , due to ZnO and TiO 2 The price is too high, and the cost of raw materials has greatly increased the application of this measure; if adding MgO with a weight percentage higher than 3.5% and increasing the total content of alkaline earth metal oxides, although it can reduce the difficulty of glass melting and further improve the mechanical properties of the glass. performance, but it is easy to increase the risk of glass devitrification, which is not conducive to improving the difficulty of forming fibers and limits the application of this measure; if adding blast furnace slag with a weight percentage of less than 8%, although blast furnace slag can accelerate the melting speed of batch materials, However, it has a certain negative impact on the clarification of the glass, and the difficulty of controlling the melting process limits the application of this measure

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