Middle modulus poly (p-phenyl-terephthalamide) fiber and preparation method thereof

A technology of poly-p-phenylene terephthalamide and p-phenylene phthalamide, which is applied in the field of medium modulus poly-p-phenylene terephthalamide fiber and its preparation, and can solve the problem of affecting industrial efficiency , Difficult fiber technology and other issues, to achieve a wide range of applications, high efficiency, and fill the gaps in the market

Active Publication Date: 2011-08-17
BLUESTAR CHENGDU NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the molecular weight is too high, the process of making fibers is very difficult, which affects industrial efficiency

Method used

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  • Middle modulus poly (p-phenyl-terephthalamide) fiber and preparation method thereof
  • Middle modulus poly (p-phenyl-terephthalamide) fiber and preparation method thereof
  • Middle modulus poly (p-phenyl-terephthalamide) fiber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Adopt the method described in "Application No. 200910216761.X" to make general fibers, and the specific scheme of its polymerization and spinning process is as follows:

[0047] The poly-p-phenylene terephthalamide (PPTA) polymer is synthesized by a low-temperature solution polycondensation method as raw materials, as follows:

[0048] A. Polymerization raw materials include:

[0049] p-phenylene diamine [PPD],

[0050] Terephthaloyl chloride [TPC],

[0051] The solvent is (N-methyl pyrrolidone) [NMP],

[0052] Polymerization-assisting salt (i.e. co-solvent) is calcium chloride (CaCl 2 );

[0053] Where: the molar ratio of PPD / TPC is equal to 1.0, CaCl 2 The molar ratio of / PPD is equal to 1.4, and the solid content of the polymerization mixture is 11%;

[0054] B. Polymerization method:

[0055] Pass nitrogen into the oven after drying, then add dry NMP / CaCl 2 Solvent and dry high-purity p-phenylenediamine (PPD), turn the agitator, mix well, start the chilled w...

Embodiment 2

[0062] The polymerization and spinning process for this example was the same as that described in Example 1, but with wet yarn stretching prior to drying in the spinning step.

[0063] In this embodiment, wet yarn stretching is mainly carried out before the drying process, that is, by adjusting V 6 / V 5 Ratio to achieve stretching. through different V 6 / V 5 Ratio, the obtained fiber properties are shown in Table 3.

[0064] Table 3 Mechanical properties of fibers subjected to wet yarn micro-stretching before drying

[0065]

[0066] The above data clearly indicate that stepwise wet yarn stretching during washing and drying increases fiber strength and modulus.

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Abstract

The invention discloses a middle modulus poly (p-phenyl-terephthalamide) fiber, which is prepared by the following steps of: adopting a poly (p-phenyl-terephthalamide) polymer with the logarithmic viscosity of 5.5 to8.0dL / g as a raw material, wherein the poly (p-phenyl-terephthalamide) polymer is obtained by a low-temperature solution polycondensation method, and stretching undried wet yarns to preparing the middle modulus poly (p-phenyl-terephthalamide) fiber before washing, neutralizing and drying working procedures of a dry-jet wet spinning process. For the middle modulus poly (p-phenyl-terephthalamide) fiber, the modulus is 550 to 800g / denier and the logarithmic viscosity is 5.0 to 7.5 dL / g. A fiber product obtained by adopting the method not only has gloss of high crystal degree, bright colors, few broken filaments, but also has excellent yarn strength, middle-class modulus and wider application range.

Description

technical field [0001] The invention relates to the field of man-made fibers, in particular to a polyparaphenylene terephthalamide (PPTA) polymer with a logarithmic viscosity of 5.5-8.0dL / g as a raw material, and in a dry-jet wet spinning process, through A kind of poly-p-phenylene terephthalamide fiber with excellent long yarn strength and intermediate modulus suitable for industrial scale production obtained by stretching wet yarn and its preparation method. Background technique [0002] Poly(p-phenylene terephthalamide) (PPTA) fiber was synthesized by DuPont of the United States in 1965 by low-temperature solution polycondensation reaction, and then PPTA / H 2 SO 4 The solution has liquid crystal behavior, and the method of dry-jet wet spinning was invented to obtain high-performance poly-p-phenylene terephthalamide fiber (referred to as "aramid fiber II"). The patents of related technologies were published in the United States in 1970-1985, such as patent number: 3671542...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/32D01D5/00D01F6/60D01D5/12
Inventor 王凤德王锡璐彭涛杨其武马俊雍
Owner BLUESTAR CHENGDU NEW MATERIALS
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