A kind of test method of fiber fibrillation

Abstract

The invention relates to a testing method for the fibrillation of fibers. A fiber bundle is treated by adopting an ultrasonic oscillation method; the fibrillation degree is tested and is an average value of fibrillation indexes F of the fibers in the fiber bundle; a point formed by fixing multiple fibers on the fiber bundle is used as a bundling point; minimum lengths of fiber segments between two ends of the fiber bundle and the bundling point are a and b, corresponding maximum lengths are c and d, the ratio of (c-a) to a is less than or equal to 10 percent and the ratio of (d-b) to b is less than or equal to 10 percent; the length of the fiber segment with the minimum length between the end of the fiber bundle and the bundling point is 0.45 to 0.55 that of the fiber. Testing results show that fibrillation conditions of all the fibers in randomly-selected 50 fibers are relatively uniform and are far higher than the level of the prior art. By using the testing method disclosed by the invention, the fibrillation degree of the fibers can be characterized more accurately; the testing method has the advantages of simplicity and convenience in operation, high efficiency and small testing errors.

Description

technical field [0001] The invention belongs to the field of fiber detection and relates to a method for testing fiber fibrillation. Background technique [0002] The fibrillation process of the fiber refers to the process in which the surface of the fiber splits into tiny microfibers with a diameter of 1 μm to 4 μm. The degree of fibrillation of the fiber is closely related to the mechanical properties of the fiber such as stability, air permeability, and tensile fracture. It is an indispensable technical index for researchers to study fiber performance. Therefore, in recent years, the test method for the degree of fiber fibrillation has gradually become a research hotspot for researchers. [0003] In order to obtain a more accurate technical index of fiber fibrillation degree, researchers have done a lot of research on the test method of fiber fibrillation degree. For example, in the literature (A.Peguy and P.Gatenholm.Improvement of adhesion between polyethylene and rege...

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Problems solved by technology

For example, in the literature (A.Peguy and P.Gatenholm.Improvement of adhesion between polyethylene and regenerated cellulose fibers by surfacefibrillation), researchers immersed a small amount of short fibers with a length of 20 mm in distilled water, mechanically shook them for 9 hours, and observed the formation of adhesion on the fibers with a microscope. The number of fibrils and the degree of crimp, and graded against the standard sample card to determine the degree of fiber fibrillation; in the literature (Relationships between fibrillation behavior of lyocell fibers and their physical properties), the fibers are immersed in Na 2 CO 3 Aqueous solution, shaking at a speed of 120 rpm at room temperature for 30min, taking out the fiber, washing it with water and drying, observing the degree of fibrillation of the sample with a microscope; literature (Physical Properties and Fibrillation Tendency of Regenerated Cellulose Fiber Dry Jet-Wet Spun from High- Molecular Weight Cotton Linter Pulp / NMMOSolution,) is tested by immersing the fiber in NaOH solution; in the literature (Structural characterization and properties of Lyocell fibers after fibrillation and enzymatic defibrillation finishing treatments), the short fiber is treated with a combination of ball milling and vibration to make it Fibrillation is produced and tested; in the literature (Contribution to the Judgment of Fibrillability of Cellulosic Fibers), the wet abrasion resistance times of Lyocell fiber are tested by mechanical rotation to characterize its degree of fibrillation; but the test process is complicated and the test process in the above-mentioned test method The fibrillation treatment conditions of medium fibers are not easy to control, which is not conducive to large-scale promotion and use

Compared with the above measurement methods, the ultrasonic oscillation method has become an important development direction for researchers to study fibrillation measurement methods because of its advantages of simple equipment, less fiber consumption, and easy control of processing conditions. The degree of fibrillation of fibers is usually measured by freely dispersing individual fibers in the treatment liquid. When ultrasonic vibration is performed, the intensity of ultrasonic waves along (radial radiation) will attenuate, which will eventually lead to the degree of fibrillation of fibers between different individuals. There are large differences, and the uniformity of the overall fiber is small, so there will be a certain degree of error in the final measured data

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