Low temperature dyeable contractile polyacrylonitrile fibre and preparation method thereof

Abstract

The invention relates to a low temperature dyeable contractile polyacrylonitrile fibre and a preparation method thereof. The polyacrylonitrile fibre is characterized in that it is composed of 50-95wt% of a polymer A and 5-50wt% of an inorganic-organic composite macromoleclar polymer B. The polymer A comprises 85-100wt% of acrylonitrile, 0-5wt% of a third monomer and 0-10% of a copolymerizable other monomer. The inorganic-organic composite macromoleclar polymer B is a compound of 50-90wt% of a polymer C and 10-50wt% of inorganic metal oxide or metal inorganic acid salt nanoparticles, and the polymer C consists of 10-65wt% of acrylonitrile, 20-65wt% of a second monomer, 5-30wt% of a third monomer and 1-5% of a fourth monomer. When the low temperature dyeable contractile polyacrylonitrile fibre provided by the invention is subjected to conventional dyeing at a temperature of lower than 75DEG C, the dyeing relative saturation value can reach 0.4 or more than 0.4, and after dyeing, the contraction rate in over 105DEG C heat-moisture treatment can reach 20% or more.

Description

technical field [0001] The invention belongs to the technical field of chemical fiber manufacture, and relates to a shrinkable polyacrylonitrile fiber dyed at low temperature and a preparation method thereof. Background technique [0002] Polyacrylonitrile fiber is one of the three major synthetic fibers, usually spun from high polymer composed of more than 85wt% acrylonitrile (AN) and other second and third monomers to improve spinnability and dyeability. Trade name acrylic. By changing the content of the second monomer and adjusting the corresponding spinning process, high-shrinkage fibers with a certain shrinkage rate can also be prepared. At the same time, due to the existence of the ionic third monomer, the polyacrylonitrile fiber has excellent dyeing performance, and is widely used in knitted underwear, blankets, artificial fur and other clothing fields. The conventional dyeing process of polyacrylonitrile fiber generally adopts high temperature dyeing method, and th...

AI Technical Summary

Problems solved by technology

Higher dyeing temperature brings a series of problems: after the fiber is boiled in a high-temperature dyeing bath, the mechanical properties such as wet modulus decrease, and the hand feels hard after dyeing; due to the influence of temperature on the dyeing speed, it is necessary to add slow dyeing during dyeing If the agent is out of control, it is very easy to appear color flowers, and the energy consumption is also high

The low-temperature dyeing performance of fibers obtained by copolymerization modification is good, but the compounding ratio of component B in these methods is relatively high, which will affect the final mechanical properties or thermal properties of the fibers

And it also increases the difficulty of uniform mixing of the two components. If the mixing effect is poor, gel particles will easily be produced, which will easily block the spinneret hole or cause broken filaments, which will affect the fiber quality.

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