Chinlon 6 for spinning and manufacturing method thereof

Abstract

The invention relates to chinlon 6 for spinning. The chinlon 6 is prepared from the following raw materials in parts by mass: 96 to 98 parts of caprolactam, 2 to 4 parts of desalted water, 0.28 to 0.3 part of molecular weight controlling agents and 0.05 to 0.15 part of thermal stabilizers, wherein the molecular weight controlling agents are any one kind of materials from terephthalic acid, m-phthalic acid and 1.4-phenylenediacetic acid; the thermal stabilizers are 4-amino-2,2,6,6-4 methyl piperidine and N,N'-bis(2,2,6,6- tetramethyl-4 piperidyl)-1,3-benzenedicarboxamide.

Description

technical field [0001] The invention belongs to the field of nylon 6 modification, and in particular relates to a nylon 6 used for spinning and a manufacturing method thereof. Background technique [0002] One of the trends in the development of chemical fiber textile technology is to continuously increase the spinning speed. The melt spinning speed of nylon 6 fiber, an important variety of chemical fiber, has grown from hundreds of meters per minute to several kilometers per minute. The obvious advantage of high-speed spinning is that it can greatly increase production efficiency and reduce unit cost, and the fibers produced by it have high physical stability and are suitable for post-processing such as texturing, so they are widely used. Nylon 6 high-speed spinning has extremely high requirements on spinning raw material slices. Viscosity, moisture, oligomer content, and inorganic additive content, uniformity, dispersibility and other factors will affect the spinning proc...

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Problems solved by technology

[0003] In order to solve the above problems, Chinese patent CN 102675628 A discloses a bright nylon 6 slice spun at high speed, which is produced by polymerization of the following components: caprolactam, barium sulfate, molecular weight modifier and light stabilizer, and its weight percentage is: caprolactam 105 -110%, surface-treated barium sulfate 0.001-0.1%, molecular weight regulator 0.2-2%, light stabilizer 0.05-0.5%, the molecular weight regulator is C2-C18 linear alkyl or C4-C8 cycloalkyl, Any one of C6-C24 aromatic dicarboxylic acid, C4-C20 linear alkyl, C4-C8 cycloalkyl, C6-C24 aromatic diamine, the light stabilizer is 4-carboxy-2,2 ,6,6,-tetramethylpiperidine or 4-amino-2,2,6,6,-tetramethylpiperidine, the production process of nylon 6 spinning is mainly melt spinning, and the raw material slices are finished at the end of polymerization The reaction equilibrium has been reached, but due to the great difference between the conditions of the chip polymerization reaction and the melt spinning, the chip will undergo a "rebalance" reaction during the melting process, mainly chain growth, chain exchange, addition and reverse reaction, etc., and from the chip To become a fiber, it needs to pass through a series of heating elements such as the screw and spinning components, and the residence time is more than 20 minutes. The change in the performance index of the slice before entering the screw and after entering the screw has a great influence on its spinnability and dyeing performance. Influence, the patent uses a single thermal stabilizer, the nylon 6 made of nylon 6 has low thermal stability and poor spinnability, so that the high-speed spinning full volume rate and heat-resistant dyeing A rate that can be achieved are not high, and further improvement is needed

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