Method for dissolving polymer in solvent and apparatus thereof

A polymer and solvent technology, applied in the direction of dissolving, dissolving, driving the agitator to dissolve, etc., can solve the problems that the axial flow cannot be effectively increased, the screw cannot provide high shear force, and it is difficult to disperse the polymer. Achieve the effect of reducing the amount of material held, reducing the volume of the equipment, and improving the dissolution efficiency

Inactive Publication Date: 2020-07-10
JIANGSU QINGYUN NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Method for dissolving polymer in solvent and apparatus thereof
  • Method for dissolving polymer in solvent and apparatus thereof
  • Method for dissolving polymer in solvent and apparatus thereof

Examples

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Effect test

Embodiment 1

[0089] according to figure 1 The equipment shown is operated, the polymer is linear polyethylene with a melt index of 0.5, the solvent is trifluoromethane, its content is 14%, the mass flow rate is 80 kg / h (volume flow rate is about 70 L / h). The operating temperature of the first-stage workshop and the second-stage workshop are both 185°C, the pressure is 113bar, and the internal volume is 30L. The first stage belongs to the high-shear stirring zone, which has three layers of equal-spaced disc turbine impellers with backward curved impellers, the stirring speed is 500rpm, and the calculated residence time is 26min; the second stage belongs to the axial flow stirring, with two Stirring paddles with the same equidistant distribution in the same layer, one of which is a push-type paddle, and the other is a paddle-type paddle with a draft tube, the stirring speed is 150rpm, and the calculated residence time is 26min.

Embodiment 2

[0091] according to figure 2 The plant shown is operated with a polymer of linear polyethylene (PE) with a melt index of 1, a solvent of trifluoromethane at a content of 15%, and a mass flow rate of 80 kg / h (volume flow rate of about 70 L / h). The operating temperature of the first-stage workshop and the second-stage workshop are both 185°C, the pressure is 150bar, and the internal volume is 15L. The first stage belongs to the high-shear stirring zone, which has three identically spaced disc turbine impellers with straight impellers, the stirring speed is 800rpm, and the calculated residence time is 13min; the second stage belongs to the axial flow stirring, and the internal volume is 30L, there are three layers of the same push-type stirring paddles distributed at equal intervals, the stirring speed is 300rpm, and the calculated residence time is 26min.

Embodiment 3

[0093] according to image 3 The equipment shown is operated, the polymer is polypropylene (PP) with a melt index of 3, and the solvent is 1,1-dichloro-2,2,2-trifluoroethane (HC-123) at 10% , the mass flow rate is 80kg / h (the volume flow rate is about 70L / h). The operating temperature of the first-stage workshop and the second-stage workshop are both 150°C, the pressure is 220bar, and the internal volume is 30L. The first stage belongs to the high-shear stirring zone, with three layers of equally spaced semi-pipe disc turbine impellers, the stirring speed is 800rpm, and the calculated residence time is 26min; the second-stage equipment is hollow, and the calculated residence time is 26min. The circulating pump adopts a closed pump with a flow rate of 300L / h.

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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...

Claims

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Application Information

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IPC IPC(8): B01F13/10B01F1/00
CPCB01F21/10B01F33/831B01F33/83612
Inventor 叶孔萌
Owner JIANGSU QINGYUN NEW MATERIAL TECH CO LTD
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