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Method and equipment for preparing high molecular weight polycondensate

A technology of high molecular weight and condensation polymers, applied in the field of polymers, can solve the problems of low equipment volume efficiency, small volume of molten materials, short residence time, etc., to achieve uniform distribution, increase the amount of molten materials, and increase the surface area Effect

Inactive Publication Date: 2010-11-03
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to solve the problem of small volume of molten material contained in unit volume of equipment, low volume efficiency of equipment, small surface of devolatilization and short residence time in the process of devolatilization of molten polycondensate, and to improve the initial The distribution method strengthens the surface renewal effect during the initial distribution of the feed material, thereby achieving a more uniform material distribution and improving the devolatilization effect

Method used

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  • Method and equipment for preparing high molecular weight polycondensate
  • Method and equipment for preparing high molecular weight polycondensate
  • Method and equipment for preparing high molecular weight polycondensate

Examples

Experimental program
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Effect test

preparation example Construction

[0035] use as figure 1 As shown in the reaction equipment and flow process for the preparation of high molecular weight polycondensate, the reaction equipment 6 is a vertical cylindrical equipment with a distributor 5 and a network structure 9 inside; the distributor 5 is a horizontally rotating moving part or A distribution head with multiple openings or a combination of the two; the network structure 9 is a vertical hollow cylindrical metal network structure; the distributor 5 and the network structure 9 are separated by a space without contact.

[0036]The network structure 9 is a strip-shaped or tubular, plate-shaped, corrugated plate-shaped or groove-shaped metal member connected by metal materials with a cross-sectional shape of a circle or a rectangle, a ring or a groove, arranged in a crossing, overlapping or parallel manner. composed of methods. The moving parts that rotate horizontally are one or more layers of plane discs or curved discs, and their edges are zigzag...

Embodiment 1

[0038] A mixture of bisphenol A and diphenyl carbonate (the molar ratio of diphenyl carbonate to bisphenol A is 1.07) and tetramethylammonium hydroxide (in terms of per mol of bisphenol A, the amount added is 1.0×10 -4 mol) added to the attached figure 1 In the shown prepolymerization tank 1, under stirring state, the temperature is maintained at 180-240°C and the pressure is 13.3-1.33kPa to carry out the polymerization reaction for 2 hours to obtain a molten prepolymer with a viscosity-average molecular weight (Mv) of 5000. The system was then returned to normal pressure and continued heating to 260°C.

[0039] Start the motor 3 to make the distributor 5 rotate at the required speed; start the vacuum pump to extract the gas through the gas outlet 4 to enhance the vacuum in the reactor 5 and maintain it at the required value; the heat from the thermal oil inlet 12 to the reactor Hot oil is passed into the oil jacket 8 and then flows out through the hot oil outlet 7 to maintai...

Embodiment 2

[0044] A mixture of bisphenol A and diphenyl carbonate (the molar ratio of diphenyl carbonate to bisphenol A is 1.07) and tetramethylammonium hydroxide (in terms of per mol of bisphenol A, the amount added is 1.0×10 -4 mol) added to the attached figure 1 In the shown prepolymerization tank 1, the temperature was kept under stirring at 180-250°C and the pressure was 13.3-1.33kPa to carry out the polymerization reaction for 2.5 hours to obtain a molten prepolymer with a viscosity-average molecular weight (Mv) of 7000. The system was then returned to normal pressure and continued heating to 280°C.

[0045] open attached figure 1 The valve on the feed pipeline of the shown reactor 6 starts the discharge pump 2 of the prepolymerization kettle, and feeds the reactor 6 continuously with a flow rate of 40kg / h. Open the valve on the discharge pipe at the bottom of the reactor 6 and start the reactor discharge pump 11 to discharge the polycondensation product.

[0046] The external d...

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Abstract

The invention relates to a method and equipment for preparing high molecular weight polycondensate. The method comprises the following steps of: feeding a fusion mixture of monomers serving as raw materials or a fusion prepolymer obtained by reacting the fusion mixture into vertical polycondensation reaction equipment; in the reaction equipment, under the required temperature, pressure and catalyst conditions, dispersing the fusion mixture or the fusion prepolymer in a special distributor; uniformly distributing the fusion mixture or the fusion prepolymer on a special metallic network structure which comprises a huge inside surface by space movement; allowing the fusion mixture or the fusion prepolymer to flow to the bottom part of the equipment along the metallic network surface in the structure circuitously under the action of gravity; and completing the specified polycondensation reaction during the movement to obtain a polycondensation product with the prospective molecular weight. The method has the characteristics of high equipment volume utilization rate, large liquid phase surface, small devolatilization resistance and excellent product quality.

Description

technical field [0001] The invention relates to the technical field of macromolecules, in particular to a method and equipment for preparing high molecular weight condensation polymers. Background technique [0002] In the industry, when preparing some high molecular weight polymers such as polyesters and polycarbonates, etc., as the polycondensation reaction proceeds, the viscosity of the molten reaction system continues to increase, so that the volatile solvents are removed from the reaction system. The difficulty of small molecule by-products increases continuously, and the rate of polycondensation reaction decreases, so it is difficult to obtain polycondensation products with high polymerization degree. This is a conundrum facing the field. It can be considered that the resistance of the devolatilization process limits the speed and progress of the polycondensation reaction to a large extent. [0003] In order to solve the devolatilization problem in the polycondensati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/78C08G63/16C08G64/30C08G64/04
Inventor 李复生崔金华魏东炜刘邦孚
Owner TIANJIN UNIV
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