Rare earth oxide co-doped fluoride-free low-dielectric glass fiber and preparation method thereof

Abstract

The invention provides fluoride-free glass fiber with low dielectric constant and low dielectric loss. The dielectric constant and the dielectric loss of the glass fiber can reach better levels. The dielectric constant and the dielectric loss at 1 MHz are 4.17-4.87 and 4.24*10<-3>-6.28*10<-3> respectively. The dielectric property of glass is optimized through co-doping of rare earth. Glass fiber composition is prepared from raw materials in percentage by mole as follows: 55%-67% of SiO2, 18%-26% of B2O3, 6%-12% of Al2O3, 0.1%-1% of Na2O, 2%-7% of CaO and 0.5%-6% of La2O3, Ce2O3 and Y2O3. The glass fiber is suitable to be used as a reinforcing material of a printed circuit board.

Description

technical field [0001] The invention belongs to the technical field of glass fibers, in particular to a fluorine-free low dielectric constant and low loss glass fiber, [0002] This fiber is especially suitable for the production of copper clad laminates. Background technique [0003] With the rapid development of electronic technology, the amount of information carried by electronic products is getting larger and larger, and multi-functional application electronic products are constantly emerging. The field has been fully developed. Electronic equipment has the characteristics of multi-functionality, lightness, flexibility, stability and reliability, which is an inevitable trend under the rapid improvement of the electronic industry and the development of information technology. , the development of integration, which puts forward higher performance requirements for low-dielectric glass fiber, that is, the reinforcing material of PCB substrate. [0004] Because glass fib...

AI Technical Summary

Problems solved by technology

E glass fiber has good water resistance and processability, and the price is low, but its dielectric constant is high, generally greater than 6.5, and the dielectric loss is relatively large, generally higher than 10 -3 , it is difficult to meet the needs of high-density PCB boards and high-speed information processing

In this regard, experts have developed a new type of glass fiber - D glass fiber, the dielectric constant of this fiber can reach about 4.1, and the loss can be as low as 8×10 -4 , excellent dielectric properties, but also has great limitations: First, compared with E glass fiber, its SiO 2 The higher the content of the glass, the higher the melting temperature of the glass, the poorer the melting property, and the defects such as air bubbles are prone to occur in the production, resulting in the difficulty of wire drawing and the problems of broken wires in the textile process; secondly, the D glass fiber-reinforced multilayer The substrate has high hardness and poor drilling performance, which is not conducive to subsequent production and processing; moreover, its water resistance is poor, it is not firmly bonded to the resin substrate, and it is easy to peel off

[0007] Chinese patent 96194439.0 discloses a low dielectric constant glass fiber with reduced calcium oxide content, which reduces the possibility of glass crystallization, and its dielectric constant can reach about 4.2~4.5; but in order to improve the melting performance, the glass fiber Introduced 1%~4% TiO 2 , while TiO 2 The introduction of glass will color the glass, limiting its application

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