Method for dissolving polymer in solvent and apparatus thereof

Abstract

The invention relates to a method for dissolving a polymer into a solvent during solution spinning, the method comprises two stages of series dissolving sections, a first stage of section uses stirring equipment with high shearing force, and a second stage of section uses equipment with a strong convection mixing effect. According to the method disclosed by the invention, the polymer can be efficiently dissolved in the spinning solvent, so that the discharged spinning solution is more uniform, and stable spinning is facilitated; the material contact time is shortened, and the equipment size isreduced, so that the material holding amount is reduced, and the risk value of the pressure container is reduced; the decomposition probability of materials at high temperature is reduced, and the product quality is improved; and the amount of pollutants generated by high-temperature decomposition of the materials is reduced, and harm to the environment and corrosion to equipment are reduced.

Description

technical field [0001] The invention relates to a method and equipment for dissolving polymers in solvents, in particular to a method and equipment for dissolving polymers in solvents during solution spinning, which can realize uniform dissolution of polymers in solvents, The molten polymer and solvent can be quickly and efficiently emulsified, thereby rapidly dissolving the molten polymer. Background technique [0002] Solution spinning refers to the method of quantitatively extruding the high polymer concentrated solution from the spinneret hole, and the solution flows through the coagulation bath or hot air or hot inert gas to solidify into fibers. In the solution spinning process, how to dissolve the high polymer into the spinning solvent uniformly and efficiently has always been the goal pursued by this field. [0003] Flash spinning is a solution spinning method used to manufacture ultrafine fibers. Usually, the polymer is made into a spinning solution in a certain so...

AI Technical Summary

Problems solved by technology

But still there are following technical problems in the technical scheme described in US3227794: (1) generally can produce the stirring equipment of high shear force to need higher rotating speed, this stirring equipment and propulsion type stirring paddle use same stirring shaft, so can not It is required to balance a high-speed stirring and a medium-low speed stirring; (2) The viscosity of the polymer in the solvent is relatively high, and the efficiency of the propulsive stirring paddle drops very quickly when mixing a viscous system, and cannot effectively increase The flow of axial flow; (3) screw mixing cannot provide high shear force, short residence time, poor dispersion effect, and there is only a small section of feed inlet section that can theoretically provide high shear force in the mixing tank. Difficult to completely disperse high viscosity polymers

[0006] Especially in flash spinning, it is necessary to dissolve the polymer in the solvent under high temperature and high pressure. The equipment used is usually equipped with pressure equipment, which belongs to the third type of pressure vessel controlled by the state. more risky

Images