High magnesium content boron-free glass fiber

Abstract

The invention relates to high magnesium content boron-free glass fiber, which has high tensile strength and high elastic modulus, and is boron-free, fluorine-free and alkali-free glass fiber. The composition of the glass fiber adopts a four-element system of SiO2, Al2O3, CaO and MgO as the main. The glass fiber is characterized in that, based on the composition of the SiO2, the Al2O3, the CaO and the MgO, the CaO is substantially replaced by the MgO, and concurrently TiO2, Fe2O3 and other components are introduced and / or added, wherein the mass of the four main components of the SiO2, the Al2O3, the CaO and the MgO is more than 96.5% of the mass of the glass fiber, and the sum of the masses of the remaining secondary components including the TiO2, the Na2O, the K2O, the Fe2O3 and other inevitable impurities is 1.5-3.5% of the mass of the glass fiber. According to the present invention, the tensile strength and the elastic modulus of the glass fiber of the present invention are significantly higher than the tensile strength and the elastic modulus of the ordinary alkali-free glass fiber, and the glass fiber of the present invention has excellent acid resistance. According to the glass, high melting temperature and high fiber forming temperature are required, wherein the difference value between the fiber forming temperature and the liquid phase line temperature is more than 70 DEG C, and the condition of the industry production of the glass fiber is met.

Description

technical field [0001] The invention relates to a high-performance glass fiber formula with high magnesium content. The glass fiber greatly increases the MgO content, obviously changes the structure of the ordinary alkali-free glass fiber, and significantly improves the fiber performance. At the same time, the formula does not contain boron and fluorine, and it is also an environmentally friendly glass fiber formula with less harmful gas emissions. Background technique [0002] The most common glass composition used to make continuous glass fiber strands is "E glass". The liquidus temperature of E glass is 1050°C or lower, and E glass is aluminoborosilicate glass with an alkali metal oxide content of less than 1%. Its chemical corrosion resistance is poor, especially not resistant to the erosion of inorganic acids. The FRP prepared by it is very easy to be corroded in acidic environment and peeled off from the resin matrix, losing strength rapidly; and with the increase of ...

AI Technical Summary

Problems solved by technology

For example, some patent glass components that have been disclosed at home and abroad do not contain boron and fluorine, but in order to reduce the high-temperature viscosity of the glass, ZnO and TiO are added in a total amount higher than 3.5%. 2 , due to ZnO and TiO 2 The price is expensive, so the cost of glass raw materials is greatly increased, which restricts the popularization and application of the glass fiber

For some boron-free glass fiber formulations that have been reported in China, the MgO content is generally controlled within 2.0% in order to facilitate drawing and forming, which not only limits the use of MgO-containing raw materials, but also has no obvious advantages in strength and elastic modulus. It is necessary to develop glass fibers with excellent acid resistance and significantly improved mechanical properties