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Glass fiber is a new type of functional and structural materials, its excellent performance is widely used in electronics, telecommunications, nuclear energy, aviation, aerospace, weapons and other high-end, twenty-first century is indispensable for sustainable development of high-tech materials . The current production of more than 90% continuous glass fiber is E-glass, but, in the process of E-glass melting boron, fluorine fluorine acid, hydrofluoric acid and volatilized fluoroborate salt, not only affect the homogeneity of the glass component , glass performance, and will pollute the environment. E glass fiber production process reducing boron, fluorine pollution on the environment has become the focus of attention. Based on the full analysis of the research status on the basis of the boron-free glass system structure, properties and process performance were studied systematically. Respectively, with the same number of moles of MgO, TiO 2 , ZnO alternative CaO, cooled by conventional melt prepared boron-free glass glass system. Using infrared spectroscopy (IR), nuclear magnetic resonance method to analyze the changes in the structure of glass, and the glass density, dielectric constant, chemical stability, process performance testing, microstructure and properties discussed the relationship between. Based on the optimal design optimization boron-free glass fiber formula. Boron-free glass fiber based system into an alkaline earth metal oxides MgO. IR and NMR results show that: In the base glass system, Al 3 is not completely into the glass network structure, part of the Al 3 to [AlO 6 ] the form of the network structure; 1.5mol% MgO favor the introduction into the network structure of the rest of Al3, reinforced glass structure. With the increase in the amount of MgO instead, increasing the density of the glass; dielectric constant and dielectric loss value decreases; chemical stability enhancement; upper devitrification temperature first decreased and then increased; drawing temperature gradually decreased, wherein an amount of MgO substituted 3mol %-6mol%, matching the glass fiber drawing process requirements. Boron-free glass fiber based systems were introduced transition metal oxides TiO 2 and ZnO research. ① infrared spectroscopy showed that, TiO 2 substitution of 1.5mol%-3mol% when, Ti 4 to the network in the form of the outer body; substitution 4.5mol%, the Ti 4 to [TiO4] form of access to the network structure; substitution 6mol% when, Ti4 obvious anti-polarization, the network structure of the glass first and then decreased. With TiO 2 substitution increases, increasing the density of the glass; dielectric constant and dielectric loss values ??are decreased first and then showed a tendency to increase; chemical stability improved; maximum temperature of the first crystallization and then decreased; drawing temperature is gradually lowered. TiO 2 substitution for the 1.5-3mol%, matching the glass fiber drawing process requirements. ② IR spectra show, ZnO when the substitution amount of 7.5mol%, Zn 2 still exist in the form outside the network, the network structure of the glass gradually. Substituted with ZnO increases, the density increases; glass dielectric constant decreases first and then increases; decreased dielectric loss; chemical stability is improved; upper devitrification temperature first decreased and then increased; drawing temperature is gradually reduced. Replace the amount of ZnO 1.5-4.5mol%, the glass fibers of the drawing process in accordance with requirements. According to the above experimental results, the effects of MgO, ZnO, TiO 2 role of co-boron-free glass fiber properties, and provide the best boron-free glass fiber formula.
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