Quartz glass filler, resin composition and copper clad laminate

Abstract

The invention relates to a quartz glass filler, which is characterized in that: the mass content of silicon dioxide in the quartz glass filler is ≥99.5%, the mass content of aluminum oxide is ≤0.2%, the mass content of water is ≤0.0005%, and the The mass content of sodium < 0.01%, the mass content of potassium oxide < 0.01%, the mass content of lithium oxide < 0.01%, the mass content of calcium oxide < 0.01%, the mass content of magnesium oxide < 0.01%, and the mass content of barium oxide < 0.01%, the mass content of strontium oxide <0.01%, the mass content of ferric oxide <0.01%, the mass content of titanium dioxide <0.01%, the dielectric constant of the quartz glass filler is 3.5~3.8, and the dielectric loss is 0.0001~0.001, hydrophobicity ≥ 24 hours.

Description

technical field [0001] The invention belongs to the field of copper-clad laminates, and in particular relates to a quartz glass filler, a resin composition and a copper-clad laminate. Background technique [0002] Copper-clad laminate is a plate-shaped material made of insulating paper, glass fiber cloth or other fiber materials impregnated with resin, one or both sides covered with copper foil, and hot-pressed. It is the basic material of PCB. [0003] Quartz glass currently used in copper clad laminates (the mass content of silicon dioxide is 98.5% to 99.7%, the mass content of aluminum oxide is 0.1% to 0.3%, the mass content of water is 0.1% to 0.3%, and the mass content of sodium oxide is 0.05% % to 0.1%, the mass content of potassium oxide is 0.05% to 0.1%, the mass content of lithium oxide is 0.05% to 0.1%, the mass content of calcium oxide is 0.05% to 0.1%, and the mass content of magnesium oxide is 0.05% to 0.1%. The mass content of barium is 0.05%~0.1%, the mass co...

AI Technical Summary

Problems solved by technology

With the improvement of the dielectric constant and dielectric loss requirements of copper clad laminates (dielectric constant: <3.8, dielectric loss: <0.001), the current quartz glass can no longer meet the needs of copper clad laminates

The main reasons why the current quartz glass powder cannot meet the higher requirements for the dielectric constant and dielectric loss of copper-clad laminates are: 1. The links between elements in the quartz glass structure are broken, resulting in many small void structures. At the same time, broken bonds make Originally, the structure of silicon-oxygen-silicon has changed into a silicon-oxygen structure, and the silicon-oxygen structure itself is very easy to absorb moisture in the atmosphere to form hydroxyl groups (hydroxyl is also a form of water, the lower the moisture content, the lower the hydroxyl content), and the voids Due to capillary action, the structure is easy to absorb moisture in the atmosphere, resulting in a high hydroxyl content of the quartz glass; 2. If the quartz glass contains lithium, sodium, potassium elements or calcium, magnesium, barium, strontium elements or iron, titanium elements, these elements It exists in quartz glass in the form of ions, which can easily lead to ion hydration, and the adsorbed water also exists in the form of hydroxyl groups, so the high content of these elements is another reason for the high content of hydroxyl groups in quartz glass. At the same time, these elements Easily polarized, resulting in increased dielectric constant and dielectric loss of the material

However, due to the high content of hydroxyl groups in the quartz glass powder, its hydrophilicity is strong, which leads to the fact that the quartz glass powder is not conducive to the dispersion in the polymer resin and is prone to agglomeration; in addition, the hydroxyl group is a polar group, which is easy to polarize and cause The material has a high dielectric constant and dielectric loss

3. Quartz glass, when it is not transparent, it does not form a complete glass state. At this time, other crystal forms of quartz or impurities exist in the material, and the dielectric constant and dielectric loss of non-glass quartz glass are both At the same time, the impurities in it are often some metal ions, which will lead to an increase in the dielectric constant and dielectric loss of the material

4. The high water absorption rate of the material will cause the material to absorb water easily during storage (dielectric constant ≈ 80), resulting in an increase in the dielectric constant of the material and poor performance of the copper clad laminate

The use of these materials to prepare high-purity quartz glass, first, the cost is very high and the yield is extremely low, and second, the by-products of production either pollute the environment or lead to increased carbon emissions

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