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High strength and high modulus para-aramid fiber and preparation method thereof

A para-aramid fiber, high-strength and high-modulus technology, applied in fiber treatment, single-component copolyamide artificial filament, artificial filament cleaning/drying, etc., can solve the problem of high manufacturing cost, achieve physical performance improvement, Wide range of applications and the effect of reducing corrosion of equipment

Active Publication Date: 2012-03-21
南充易安新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, improving the solubility of aramid polymer resin, directly using slurry for spinning, and further improving the mechanical properties of aramid fiber have become an important direction of development, but the above-mentioned technologies still have the problem of high manufacturing cost.

Method used

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  • High strength and high modulus para-aramid fiber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1 : A high-strength and high-modulus para-aramid fiber (CyPPTA), which is prepared from a polymer with an intrinsic viscosity of 7.0dL / g, and its intrinsic viscosity is less than 0.5dL / g lower than that of the polymer. The specific indicators of the fiber include: tensile strength 24g / d, initial modulus 700g / d, elongation at break 3.5%, monofilament fineness 1.5D, bundle yarn fineness 1000D.

[0022] 1. Polymerized spinning slurry:

[0023] Pass nitrogen into the dried reaction kettle to create a nitrogen environment. According to the molar ratio of TPC:PPD:CyPPD=10:3:7, first put 4.676kg of high-purity (above 99.9%) p-phenylenediamine (PPD) and 2,5-diaminobenzonitrile (CyPPD) 13.435kg of two diamine monomers are added to 200 liters (L) of N-methylpyrrolidone (NMP) and 20.238kg of calcium chloride CaCl2 solvent system, where CaCl 2 The content is 8wt%, then stir to completely dissolve PPD and CyPPD, use the freezing jacket of the reaction kettle to cool ...

Embodiment 2

[0030] Example 2 : A high-strength and high-modulus para-aramid fiber (CyPPTA), which is prepared from a polymer with an intrinsic viscosity of 9.0dL / g, and its intrinsic viscosity is less than 0.5dL / g lower than that of the polymer. The specific indicators of the fiber include: tensile strength 27g / d, initial modulus 850g / d, elongation at break 2.7%, monofilament fineness 1.5D, bundle yarn fineness 1500D.

[0031] 1. Polymerized spinning slurry:

[0032] Put nitrogen gas into the dried reaction kettle to create a nitrogen environment. According to the molar ratio of TPC:PPD:CyPPD=10:1:9, first put 0.967kg of high-purity (99.9% or more) p-phenylenediamine (PPD) and 2,5-diaminobenzonitrile (CyPPD) 10.713kg of two diamine monomers were added to 200 liters (L) of N-methylpyrrolidone (NMP) and 6.064kg of calcium chloride LiCl solvent system, where LiCl The content is 2.58wt%, then stir to completely dissolve PPD and CyPPD, use the freezing jacket of the reaction kettle to...

Embodiment 3

[0039] Example 3 : A high-strength and high-modulus para-aramid fiber (CyPPTA), which is prepared from a polymer with an intrinsic viscosity of 7.0dL / g, and its intrinsic viscosity is less than 0.5dL / g lower than that of the polymer. The specific indicators of the fiber include: tensile strength 24g / d, initial modulus 750g / d, elongation at break 3.3%, monofilament fineness 1.5D, bundle yarn fineness 1500D.

[0040] 1. Polymerized spinning slurry:

[0041] Put nitrogen gas into the dried reaction kettle to create a nitrogen environment. According to the molar ratio of TPC:PPD:CyPPD=10:3:7, first put 5.362kg of high-purity (above 99.9%) p-phenylenediamine (PPD) and 2,5-diaminobenzonitrile (CyPPD) 15.405kg of the two diamine monomers were added to 200 liters (L) of dimethylacetamide (DMAc) and 18.343kg of calcium chloride CaCl 2 In the solvent system, where CaCl 2 The content is 7.6wt%, then stir to completely dissolve PPD and CyPPD, use the freezing jacket of the react...

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Abstract

The invention discloses a high strength and high modulus para-aramid fiber and a preparation method thereof. The high strength and high modulus para-aramid fiber is characterized by being prepared from steps of: polymerizing 2,5-diamino Y benzene, terephthaloyl chloride or / and p-phenylenediamine monomer according to a molar ratio in a solvent system to prepare a spinning slurry, filtering the slurry, carrying out dry spray wet spinning, drying and reeling. The fiber large molecular chain infrared light spectrum has C-N bond telescoping vibration absorption peaks at wave number of 2230 cm<-1> and 1406 cm <-1> and has amide bond absorption peaks at 1662 cm<-1> and 3500-3300 cm<-1>. Specific indexes of the fiber are as below: tensile strength of 24-28g / d, initial modulus of 700-900g / d, fracture elongation of 2.5-3.5%, filament number of 1-2 D and yarn fineness of 300-3000 D. The invention is easily controlled and environment-friendly and reduces corrosion of apparatus, thereby reducingindustrialization cost and spinning cost relatively.

Description

technical field [0001] The invention relates to an aramid fiber and a production method thereof, in particular to a high-strength and high-modulus para-aramid fiber and a preparation method thereof. Background technique [0002] The fully aromatic polyamide fibers collectively referred to as aramid fibers are para-aramid fibers or meta-aramid fibers with a linear connection structure through benzene rings through amide groups (CONH). Para-aramid is characterized by extremely high strength and modulus, excellent heat resistance, chemical corrosion resistance and wear resistance. It is not only used in the field of bulletproof, but also can be used as reinforcing fiber of composite materials, such as tire cord and belt cord, and can also be widely used in the cutting-edge field of aerospace. At the same time, aramid fiber is carbonized at 500°C or higher, and it is also attracting attention in fields requiring high heat resistance. Aramid fiber known as Kevlar (DuPont), poly...

Claims

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Application Information

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IPC IPC(8): D01F6/80D01D5/00D01D10/06C08G69/32
Inventor 崔松金容训黄成柱
Owner 南充易安新材料有限公司
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