Length distribution regulation and control and length range characterization method for ultrafine glass fibers

Abstract

The invention discloses a length distribution regulation and control and length range characterization method of superfine glass fibers. The method comprises the following steps: putting a certain amount of superfine glass fiber cotton raw material into a low-speed grinding tank; setting the rotating speed and time of grinding, turning on a power supply, stirring and grinding the fibers, taking out the treated fibers, preparing uniformly dispersed slurry, carrying out suction filtration and drying to obtain ultrafine glass fibers, and changing the rotating speed and time of grinding to regulate the length distribution of the ultrafine glass fibers. The method comprises characterizing the length range of the superfine glass fibers by adopting a Pall screening instrument, selecting screens with different mesh numbers, sequentially putting the screens into a screening chamber, carrying out length screening on the superfine glass fibers, and obtaining the mass fractions of the superfine glass fibers with different mesh numbers after screening, so as to characterize the length range of the superfine glass fibers. The regulation and control method is simple and convenient to operate andhigh in efficiency, the characterization method is high in accuracy, and the requirement of the resin-based composite material for the length of the random filling reinforcing material is met.

Description

technical field [0001] The invention relates to length adjustment and characterization technology of glass fibers, in particular to a method for length distribution regulation and length range characterization of ultrafine glass fibers. Background technique [0002] With the rapid development of information technology, traditional microwave dielectric substrate materials are increasingly difficult to meet the requirements of lightweight electronic products, high-speed signal transmission, and high-frequency bandwidth. Polytetrafluoroethylene resin (abbreviated as PTFE) has excellent and stable microwave dielectric properties due to its special molecular structure, but its application is limited due to factors such as poor dimensional stability, large thermal expansion coefficient, and low strength. As a reinforcing material, fiber is widely used in various composite materials to improve the mechanical properties. The PTFE-based dielectric substrate uses glass fiber as a rei...

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Problems solved by technology

[0004] For the length characterization of glass fibers, the traditional methods are scanning electron microscope (SEM) and fiber length analyzer. However, using ordinary SEM observation, due to the wide range of ultrafine fiber length distribution and the limited field of view, the length distribution cannot be accurately characterized; The fiber length analyzer adopts the principle of CCD photography, and the glass fiber whose diameter is too thin is lower than the lower limit of its identification, and the fiber length cannot be accurately analyzed.

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