Dope – dyed High – strength Meta – aramid

2025-03-28News 490

Reasons for recommendation

The fiber is constitutionally flame – retardant, strong, corrosion resistant and high temperature resistant. The dope – dyed process enhances the product’s ecological and environmental protection features and broadens its use in scenarios like electric power operation and fire rescue, among others.

Preparative technique

Using isophthaloyl dichloride, m – phenylenediamine, and the third monomer as raw materials, we use low – temperature solution polymerization and on – line dope – dyed to break through the key technology of fiber cross – linking, realize the construction of a micro – cross – linking structure of the molecular chain, and prepare the fiber by wet spinning.

Features of fibers and finished products

Main Specifications

Staple: 1.67dtex×51mm, 1.82dtex×51mm, 2.22dtex×51mm

Filament: 220dtex/100f, 440dtex/200f, 1320dtex/600f

Relative Standards

Meta – aramid staple fiber (GB/T 31889—2015)

Staple Fibers of Dope – dyed Meta – Aramid (Q/0601 THX010—2019)

Properties of fibers and features of finished products

.Dope-dyed, colorful fiber with high color fastness, green and

environmentally friendly.

.High strength, corrosion resistance, high temperature resistance.

.The fiber is constitutionally flame retardant. The smoldering and sustained.

combustion duration of its fabric is less than or equal to 2s, without melt

drop in the combustion process.

Performance indexes of dope-dyed high-strength meta-aramid

Specifications	Breaking tenacity(cN/dtex)		Elongation at break (%)	Initial modulus(cN/dtex)	Dry thermal shrinkage (%)Testing conditions:180C,30min		Color fastness(grade)
1.82dtexx51mm	5.29		38.7	91.88	0.10		6
Fabric composition (93% this fiber/5% para-aramid/2% conductive fibers)
Limiting oxygen index		Smoldering and sustained combustion duration (s)				Burning with or without dripping
31.90		≤2				None

Examples of downstream applications of performance indexes of dope-dyed high-strength meta-aramid

Types of Fabric	Raw material ratio	Fiber specification	Count	Properties of the product
Protective fabrics for firefighting	93% dope-dyed high-strength meta-aramid/5% para-aramid/2% antistatic fibers	1.67dtexX51mm2.22dtexx51mm	32/135/240/2	Used in fire-fighting field, with flame retardance, high strength and high color fastness
Industrial protective fabrics	88% dope-dyed high-strength meta-aramid/10% flame-retardant viscose fibers/2% antistatic fibers	1.67dtexx51mm2.22dtexX51mm	32/135/240/2	Used in petroleum and petrochemical industry for worker protection, with flame retardance,high strength, comfort and high color fastness.
Emergency protective fabrics	98% dope-dyed high-strength meta-aramid/2% antistatic fibers	1.67dtexx51mm2.22dtexX51mm	32/135/240/2	Used in emergency rescues, with flame retardance, high strength and high color fastness.
Aviation casing	100% dope-dyed high-strength meta-aramidfilaments	220dtex/100f440dtex/200f1320dtex/600f	_	Used in aerospace protective casing,with flame retardance, easy laminating,high strength and high color fastness.
Home textiles	60% dope-dyed high-strength meta-aramid/38% flame-retardant viscose fibers/2% antistatic fibers	1.67dtexx51mm2.22dtexx51mm	50/160/1	Used for home bed sheets and quilt covers,with Name retardance, comfort and high color fastness.

The downstream application guidance

Spinning: Staple fibers can be spun purely or blended with other fibers in any ratio.

Weaving: Filaments are used for knitted or woven fabrics; they can also be processed into twisted yarns for weaving.

Dyeing and finishing: Positive ion dyes are used, with the dyeing and heat-setting temperature≥130℃.

Application of fibers

Clothing textiles:Curtain

Industrial textiles:Military textile/Fire supplie/Aerospace/Protective gear

Q: Upgrades to meta-aramids are ongoing. What are the advantages of

dope-dyed high-strength meta-aramids?

A: The fiber not only has enhanced strength, but also addresses the problem that meta-aramids are not easy to dye. The product is rich in color, and has high color fastness, further expanding its application in protective apparel,flame-retardant clothing, among others. In addition, the application of dyed technology also avoids the pollution and emission brought about by the post-dyeing process, which meets the requirements of green production and is in line with the trend of “ecology first and green development” of China’s economy.