Analysis of aging process of Stainless Steel Braided Sleeve?

Stainless Steel braided sleeve tube is a kind of tube material that is relatively easy to age, and its service life will not be very long, so the frequency of replacement will be relatively high, but do you know why the Cable Sleeve will age? In fact, the Cable Sleeve The aging of the tube has a process. We can understand the specific process from the following points. Relatively speaking, we can understand it from three points. The three points of appearance change-physical change-structural change, the following and small Let's take a look and find out!

1. Appearance changes
① Different types of cable bushings have different service conditions, and the changes that occur are also different.
②Soft and sticky: Thermal oxidation of natural Cable Sleeve, aging of chlorohydrin Cable Sleeve.
③ Hardening and brittleness: thermal oxygen aging of cis-butadiene Cable Sleeve, aging of nitrile Cable Sleeve and styrene-butadiene Cable Sleeve.
④ Cracks: Ozone aging of unsaturated Cable Sleeve, photo-oxygen aging of most Cable Sleeve, but the crack shapes are different.
⑤ Moldy: Biological and microbial aging of the Cable Sleeve.
⑥ In addition: there are spots, cracks, frosting, chalking and whitening.
2. Performance changes
① Changes in physical and chemical properties: specific gravity, thermal conductivity, glass transition temperature, melting point, refractive index, solubility, swelling, rheology, molecular weight, molecular weight distribution, heat resistance, cold resistance, breathability, water permeability, light transmission and other properties Variety.
② Changes in physical and mechanical properties: tensile strength, elongation, impact strength, bending strength, shear strength, fatigue strength, elasticity, and wear resistance are all reduced.
③ Changes in electrical properties: changes in electrical properties such as insulation resistance, dielectric constant, dielectric loss, and breakdown voltage, and decreased electrical insulation.
④ The cause of appearance change and performance change is structural change.
3. Structural changes
① Cross-linking occurs between molecules, the molecular weight increases, and the appearance becomes hard and brittle.
②The molecular chain is degraded (broken), the molecular weight is reduced, and the appearance becomes soft and sticky.
③Other changes in the molecular structure: modification of the main chain or side chain, side group falling off and breaking of weak bonds (occurring in special Cable Sleeve).