Glass fiber with low permittivity

Abstract

The invention discloses a low-dielectric constant glass fiber, which comprises the following parts: 50- 60% SiO2, 6.0-9.5% Al2O3, 30.5-35% B2O3, 0-1.5% Na2O, 0-1.5% K2O, 0-1.5% Li2O, 0-5% CaO, 0-5% MgO, 0.5-2.5% ZnO, 0.5-5% TiO2. When the frequency is 1MHz under indoor temperature, the dielectric constant is 3.9-4.4, which is fit for high-density wiring circuit board.

Description

technical field [0001] The present invention relates to a glass fiber with low dielectric constant. technical background [0002] With the rapid development of information technology, the processing speed of electrical signals in electronic products and their accessories has been greatly improved. Electrical performance has become one of the factors restricting the development of information technology. At the same time, the continuous progress of radar technology requires the corresponding radome to have better wave permeability, which requires the materials used to have low dielectric constant and low dielectric loss. [0003] Printed circuit boards are mainly composed of reinforcement materials (now mainly electronic grade glass fibers) and resins. Various wires and electronic components are arranged on the board. [0004] In high-frequency lines, the signal propagation speed has the following relationship: [0005] V=K·C / sqrt(ε) [0006] In the formula: V-signal pro...

AI Technical Summary

Problems solved by technology

[0009] In response to these situations, a lot of research has been done at home and abroad, and some patents have also appeared, but some of them are not easy to operate in actual production, and some are not suitable for the actual domestic materials.

D glass has a lower dielectric constant and can reduce the dielectric constant of the foil-clad board, but due to its poor melting, it is easy to produce veins and bubbles, and there are many broken glass fibers in the spinning process. At the same time, due to its aluminum content If it is too low, the water resistance is very poor, so it is easy to cause the resin to peel off from it, so that the stable requirements of the process cannot be met when printing the wiring board

Although E glass has good water erosion resistance, its dielectric constant is relatively large, and its dielectric properties can no longer meet the requirements of the development of the electronics industry.

The glass fiber component with low dielectric constant introduced in U.S. Patent 6,846,761 has a dielectric constant of about 5.0, and there is still a considerable gap between its dielectric constant and D glass; the patent 02810477.3 applied by Saint-Gobain Vitrotes Co., Ltd. in France is introduced A new low dielectric constant glass fiber composition was developed, which uses P2O5 as an essential component, so that its dielectric loss at high frequency (10GHz) is significantly lower than that at lower frequencies, However, the dielectric constant does not change significantly at high or low frequencies, and is still around 5.0; the low-dielectric glass fiber dielectric constant introduced by Nippon Textile Co., Ltd.'s patent 96194439.0 is 4.2-4.8, which fails to reach below 4.2. There will still be high dielectric loss during use. At the same time, when the corresponding components described in the specification are tested and melted during the research process, the obtained glass does not obtain the usability and process performance described in the patent.