Composition for preparing glass fibers and low-dielectric constant glass fibers thereof

Abstract

The invention discloses a composition for preparing glass fibers and low-dielectric constant glass fibers thereof. The composition for preparing the glass E fibers provided by the invention is mainly composed of the following materials by weight percent: 60.2-65% of SiO2, 10-14% of Al2O3, 23-27% of B2O3 and 0.5-2% of Li2O. The low-dielectric constant glass fibers prepared from the composition have the following advantages: dielectric properties are excellent, at the frequency of 1 MHz, the dielectric constant does not exceed 4.5 and the dielectric loss does not exceed 0.001; simultaneously, the fibers have excellent mechanical properties, and have the elasticity modulus of more than 75 GPa, which is superior to glass D (having the elasticity modulus of about 55 GPa) and also to the common glass E (having the elasticity modulus of about 72 GPa); the fibers have excellent moldability, and the molding temperature does not exceed 1350 DEG C and the molding interval is higher than 80 DEG C; and the fibers also have good thermal stability and the coefficient of thermal expansion of the fibers is about (3.0-3.2)*10<-6> / DEG C, which is equivalent to the glass E level and obviously superior to glass D.

Description

technical field [0001] The invention relates to a composition for preparing glass fiber and glass fiber thereof, in particular to a composition for preparing glass fiber with low dielectric constant and glass fiber with low dielectric constant. Background technique [0002] Modern electronic devices often include printed circuit boards reinforced with fiberglass. Many modern electronic devices, such as mobile or fixed wireless telephones, computers, personal data assistants (PDAs), etc., have electronic systems that operate at high or very high frequencies. When the glass is exposed to such high frequency or ultra high frequency electromagnetic fields, the glass absorbs at least some of the energy and converts the absorbed energy into heat. The energy in the form of heat absorbed by the glass is called dielectric loss energy. This dielectric loss energy is proportional to the "dielectric constant" and "dielectric loss tangent" of the glass composition, as shown in the foll...

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Problems solved by technology

[0016] The present invention solves the problem of insufficient mechanical properties of low-dielectric glass fibers in the prior art, and aims to provide a low-dielectric constant glass fiber, which has a dielectric property close to that of D glass, and its dielectric constant is not more than 4.5. The electrical loss is less than 0.001; at the same time, its elastic modulus is greater than 75GPa

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