Continuous filament reinforced plastic impregnation uniformity evaluation method

Abstract

A continuous filament reinforced plastic impregnation uniformity evaluation method includes a first step of taking an impregnation sample and cutting off a section of the sample, wherein sample cracking needs to be prevented in the cutting process, a second step of placing the sample on a plate grinding machine, carrying out wet grinding on the sample under flowing water through utilization of rough-thin waterproof abrasive paper in sequence, and placing the sample on a polishing machine to polish through utilization of polishing fabric and polishing paste until the section of the sample can be clearly seen under a microscope, a third step of placing the sample under the optical microscope for microscopic examination, a fourth step of taking pictures of the section of the sample, and a fifth step of carrying out statistical calculation and estimation. The continuous filament reinforced plastic impregnation uniformity evaluation method can enable continuous filament to be uniformly scattered and completely impregnated, and can also carry out qualitative evaluation on the continuous filament reinforced thermoplastic resin composite materials, and has the advantages of being simple and direct.

Description

technical field [0001] The invention relates to a method for evaluating the impregnation uniformity of continuous fiber-reinforced plastics, in particular to qualitatively evaluating the impregnation effect of a continuous fiber prepreg tape prepared by impregnation by a melt impregnation method. Background technique [0002] Thermoplastic composite materials are high-performance new materials that have made breakthroughs in recent years. They have remarkable characteristics such as high strength, high stiffness, dimensional stability, low warpage, long service life, and excellent creep resistance. Since the melt viscosity of thermoplastic resins generally exceeds 100 Pa.s, it is difficult to obtain good impregnation of continuous fibers. Solving how to obtain products with good impregnation effect is the key of this technology. [0003] Chinese patent CN101474868B discloses a preparation device and its application related to continuous fiber reinforced thermoplastic resin ...

AI Technical Summary

Problems solved by technology

Although the melt impregnation of continuous fibers can be achieved by using this process, the uniformity of impregnation cannot be quantitatively evaluated, nor can it explain the final effect achieved.

[0004] Produced by Vetrotex Blended yarns can be used to manufacture fiber-reinforced thermoplastic resin prepreg tapes and pellets that are better impregnated, that is, the thermoplastic resin is melt-spun first, then mixed with other fibers, and then the pellets are prepared by heating and melting. The apparent impregnation degree of pellets is good, but the patent does not give a characterization method for the degree of impregnation

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