Spinning stock solution for dry method acrylic fiber spinning and preparation method thereof

Abstract

The invention relates to a spinning stock solution for polyacrylonitrile spinning and especially relates to a spinning stock solution for dry method acrylic fiber spinning. The spinning stock solution is prepared from polyacrylonitrile dry powder and a solvent by mixing. The polyacrylonitrile dry powder is prepared from acrylonitrile, methyl acrylate, sodium p-styrenesulfonate and 2-acrylamide-2-methylpropanesulfonic acid as copolymerization monomers by a polymerization reaction. Through selection of appropriate copolymerization monomers and weight parts, the polyacrylonitrile dry powder with appropriate porosity, molecular weight and molecular weight distribution is obtained, and through selection of the appropriate solvent and content and control of a mixing temperature and a dissolving temperature, the spinning stock solution with rotary viscosity of 45000-65000 mpa. s is prepared from the polyacrylonitrile dry powder. The spinning stock solution has moderate viscoelasticity and less water content, is conducive to stable spinning, reduces a spinneret plate use amount and increases the number of spinning positions. The invention also provides a preparation method. The preparation method has reasonable processes.

Description

technical field [0001] The invention relates to a stock solution suitable for polyacrylonitrile spinning and a preparation method, in particular to a spinning stock solution suitable for dry acrylic fiber spinning and a preparation method. Background technique [0002] The polyacrylonitrile spinning process is divided into dry and wet spinning processes. Dry spinning is to dissolve polyacrylonitrile into a spinning stock solution, and then transport the spinning stock solution to the spinning tunnel and use hot nitrogen to remove the solvent. , Compared with wet spinning, dry spinning has a gentle forming process and uniform internal structure of fibers, which makes the physical and mechanical properties and dyeing performance of dry spinning fibers better, and the spinning section strength is good. In addition, the dry spinning speed is high, the number of spinneret holes is small, the solvent recovery is simple, the spinning process is simple, and the floor space is small;...

AI Technical Summary

Problems solved by technology

In addition, the dry spinning speed is high, the number of spinneret holes is small, the solvent recovery is simple, the spinning process is simple, and the floor space is small; the unique dog-bone structure of the dry spinning fiber makes its characteristics close to natural wool. The fabric has good elasticity, light weight, and the finished product has the characteristics of warmth, comfort, and luster; The following problems mentioned in ": (1) The viscoelasticity of the spinning stock solution is poor, resulting in a fast flow rate when the spinning stock solution is discharged, and the adapter has no outlet expansion; (2) When the water content in the spinning stock solution exceeds the standard, the spinning stock solution will The increase of air bubbles in the spinning will lead to problems such as parallel filaments and broken filaments during spinning, making it impossible to spin smoothly; (3) problems such as poor color of the spinning stock solution will affect the final quality of the product

Because these problems will lead to poor spinning, which will affect the quality of the final product, and will also cause problems such as increased production intensity of workers during production, and the molecular weight of the polymer can be controlled by controlling the monomer ratio during polymerization. and other parameters, adjusting the preparation process of the stock solution can solve the problems of poor viscoelasticity and excessive water content in the stock solution, so this patent mainly uses these means to solve the problems that occur during acrylic fiber spinning

[0003] Chinese patent 102747451A mentioned that it is suitable for the preparation of carbon fiber spinning stock solution, which mainly solves the problem that the viscosity of spinning stock solution in the technology is too high and the stock solution is prone to gel, but the polymer monomers selected by this patent are only two kinds of monomers, respectively One-step polymerization using DMF as solvent for acrylonitrile and itaconic acid

However, it does not mention the molecular weight of the polymer, the water content of the spinning stock solution, the rotational viscosity and the preparation process of the stock solution, etc., which have important influence on the spinning parameters.

[0005] In the prior art, due to problems such as poor viscoelasticity, many bubbles, and poor color of the spinning stock solution during dry spinning, production fluctuations and product quality are likely to be affected.