Meta-aramid Yarn-12-60 nm

Catalog	ACMA00031172
Description	Staple fiber yarns raw white and customized colors made of 100% meta-aramid recycled fibers, quality very close to virgin quality. Woven and knitted fabrics for personal apparel, insulating.
Application	for textile
Feature	Staple fiber yarn
Notes	Meta-aramides have excellent resistance to temperature, chemical degradation, and abrasion. It is inherently flame retardant. A meta-aramide fiber is normally produced by spinning in a chemical solution, the wet spinning process. This produces a semi-crystalline fiber with a molecular chain that is partially aligned along the fiber axis. Low stiffness and high elongation give the material a textile character, which is especially appreciated in protective clothing.
Specification	12-60 nm

Case Study

Supercritical CO2 Fluid Treatment of Meta-aramid Fiber Blends

Zheng H, et al. Fibers and Polymers, 2015, 16, 1134-1141.

The physicochemical properties of meta-aramid fiber blends (93% meta-aramid fiber, 5% para-aramid fiber, 2% organic conductive fiber) treated with supercritical CO2 fluid at different temperatures were studied.
Supercritical CO2 Fluid Treatment Method and Results
· Meta-aramid fabric was attached to a porous beam and placed in a 5-liter treatment kettle. The liquefied CO2 was pressurized above its critical pressure using a high-pressure pump and heated above its critical temperature by a heat exchanger. The supercritical CO2 fluid was then introduced into the kettle to modify the meta-aramid fabric. The treatment experiments lasted 60 minutes at a system pressure of 30 MPa and various temperatures. Finally, the CO2 fluid was recycled at pressures between 3 MPa and 4 MPa and temperatures ranging from 25°C to 40°C.
· The treated fabric showed changes in surface morphology, decreased water contact angles, and improved thermal properties. The FT-IR and XRD analyses confirmed molecular re-arrangements and re-crystallizations due to the treatment. The TG-DTG analysis demonstrated enhanced thermal stability of the fabric at different temperatures. Besides, the supercritical CO2 fluid treatment had a positive effect on the meta-aramid fabric without impacting its physical and antistatic properties.

Study on the Dyeing Properties and Color Fastness of Meta-Aramid Fiber

Kim E, et al. Fibers and Polymers, 2011, 12, 484-490.

This work studied the dyeing properties and color fastness of 100% meta-aramid fiber with several dyes under various dyeing conditions. The main dyeing properties of meta-aramid fiber are as follows:
· Better exhaustion rates were achieved through dyeing with cationic dyes, which are considered delocalized dyes with the positive charge spread throughout the entire dye molecule, when compared to acid dyes and disperse dyes.
· The percentage of exhaustion between 110 and 130 °C was influenced by the dyeing temperature, but the outcome varied depending on the structure of the dye, with ranges from 52 to 95%.
· It was found that maintaining an acidic condition in the dyebath, ideally at a pH level between 3 and 4, was most effective for dyeing m-aramid efficiently.
· The use of auxiliary agents such as swelling agent and electrolyte improved the adsorption of basic dyes onto m-aramid fiber. Sodium nitrate (NaNO₃) was observed to have the greatest impact among electrolytes, with the effect increasing in the order of NO₃^- > Cl^- > SO₄^2-.
· Although wash and rubbing fastness were generally satisfactory, the low light fastness was attributed to the limited photo-stability of cationic dyes.
· After being exposed to UV/Ozone irradiation, the m-aramid surface became more hydrophilic and negatively charged, which could enhance the ionic interactions between the fiber and dyes, leading to an increase in K/S values.