Method for preparing leather sample observed by metallurgical microscope

Abstract

The invention relates to a method for preparing a leather sample observed by a metallurgical microscope, and belongs to the technical field of leather inspection. The method comprises the following steps of: (1) adding a promoter into an unsaturated polyester resin, stirring, adding a curing agent, stirring, standing, and discharging the mixed air to obtain an immobilized resin; (2) immersing a sample into the immobilized resin, and curing to obtain a cured sample; (3) grinding both ends of the cured sample until the ends are flat, fixing in a mould, injecting the immobilized resin into the mould, curing, demoulding, and post-curing to obtain a post-cured sample block; and (4) grinding and polishing the post-cured sample block by using abrasive paper to obtain the leather sample observed by the metallurgical microscope. In the method, the unsaturated polyester resin is used as a main ingredient of the immobilized resin, and operation steps are designed according to a capillary action principle to ensure that the immobilized resin can be quickly and fully permeated into the leather sample, so the adhesion and deformation of section fiber of leather are furthest avoided.

Description

Technical field [0001] The invention relates to a method for preparing leather samples, in particular to a method for preparing leather samples suitable for metallographic microscope observation, and belongs to the technical field of leather inspection. Background technique [0002] Leather quality is usually reflected by the physical and chemical properties and sensory properties of finished leather. Sensory indicators include: fullness, softness, and elasticity, which cannot be measured by instruments at present, and can only be evaluated by the hands of experienced technicians. Since the quantitative relationship between the leather microstructure and the macroscopic properties of the finished leather is not yet clear, the quality of the products can only be controlled by artificial hands and eyes and rough judgments on the cuts of the products. [0003] The structure of leather is an internal factor that determines the performance of leather. It refers to the fiber shape of le...

AI Technical Summary

Problems solved by technology

[0005] However, under the pressure of the slicing knife during the sectioning process, the embedding agent will be compressed, and the section will shrink accordingly, which will affect the quality of the optical microscopic image

In addition, the fibers in the leather are dense, criss-cross, and uneven in thickness. During the slicing process, fibers are prone to extrusion deformation, shedding, or inter-fiber adhesion, resulting in deformation of the fiber cross-section of the sliced ​​leather sample, and it is difficult to extract accurate cross-sectional characteristic parameters.

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