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Continuous polymerization reaction device for producing poly-p-phenylene benzo dioxazole

A technology of benzobisoxazole and polymerization reaction, applied in the direction of single-component synthetic polymer rayon, fiber chemical characteristics, textiles and papermaking, etc., can solve the problem of high viscosity of PBO polymer, low polymer molecular weight and difficulty in stirring and other problems, to achieve the effect of increasing molecular weight, short production cycle and sufficient reaction

Active Publication Date: 2008-08-20
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that stirring is difficult due to the high viscosity of the PBO polymer, and the molecular weight of the polymer prepared by the existing production process is not high, and to provide a continuous process for preparing poly-p-phenylene benzobisoxazole Polymerization device

Method used

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  • Continuous polymerization reaction device for producing poly-p-phenylene benzo dioxazole
  • Continuous polymerization reaction device for producing poly-p-phenylene benzo dioxazole

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specific Embodiment approach 1

[0009] Specific implementation mode one: (see figure 1 , figure 2 ) The continuous polymerization reaction device of the present embodiment is made up of prepolymerization kettle and screw extruder unit, and the discharge port of prepolymerization kettle is connected with the feed inlet of screw extruder unit, and screw extruder unit is composed of two to ten It is composed of end-to-end screw extruders, in which the material of the screw, barrel, feed port and discharge port of the screw extruder should be acid-resistant, corrosion-resistant, or treated with acid-resistant and corrosion-resistant materials; The working temperature is 20-300°C, the extrusion pressure of the screw extruder is 0.1-30MPa, the screw diameter D=20mm-200mm, the screw length-to-diameter ratio L / D=10-60 (screw length / screw diameter, for conical For a twin-screw extruder, the screw diameter refers to the diameter of the largest screw diameter), the screw speed is 1-1000r / min, and the vacuum degree in...

specific Embodiment approach 2

[0011] Embodiment 2: This embodiment differs from Embodiment 1 in that: the connection mode of the screw extruder unit is a plane series combination or a ladder combination. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0012] Specific embodiment three: the difference between this embodiment and specific embodiment two is that the plane series combined type is to place the screw extruders on the same horizontal plane, and the included angle between the screw axes of two adjacent screw extruders is 0°~180°. Others are the same as in the second embodiment.

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Abstract

The invention discloses a continuous polymerization device which prepares PBO, which relates to a continuous polymerization device. The invention brings about solutions to the stirring problems caused by the high viscosity of PBO polymer and to the low molecular weight problems existed in the polymer which is prepared by current manufacturing process. The discharge hole of the pre-polymerization reactor of the invention is communicated with the charging hole of screw extruder unit which consists of 2-10 full-bay screw extruders which are connected by in-line platform combination or staging pack; wherein the screw, screw barrel, the charging hole, the discharge hole are acid-resisting and corrosion-resisting; the working temperature for screw is 20-300 DEG C, the extrusion pressure for the screw extruder is 0.1-30 MPa, the diameter D for the screw is 20-200 mm, the length-diameter ratio L / D for the screw is 10-60, the rotation speed is 1-1000r / min, and the vacuum degree in the screw is minus 0.1 MPa. The continuous polymerization device has the advantages of improved molecular weight, quick reaction speed, short manufacturing cycle, uniform material mixture and full reaction, which can realize continuous operation and is conductive to commercial process.

Description

technical field [0001] The invention relates to a continuous polymerization reaction device. Background technique [0002] Poly-p-phenylenebenzobisoxazole (PBO) fiber is an organic heterocyclic rigid rod-shaped liquid crystal polymer with excellent mechanical properties, heat resistance and flame retardancy, and is known as "Super fiber"; therefore, it has broad application prospects in aerospace, weapons and armaments and many other fields. The preparation method of PBO polymer has two kinds at present: a kind of method is: add more than 80% polyphosphoric acid, 4,6-diaminoresorcinol hydrochloride and terephthalic acid in the polymerization reactor, at first The hydrogen chloride gas is removed, and then the temperature is raised to realize the polymerization reaction. This method has a long reaction time (up to more than 100h), and in the later stage of the polymerization reaction, the viscosity of the system increases rapidly, the stirring is uneven in the polymerizatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/18D01F6/74
Inventor 黄玉东林宏宋元军王峰刘立洵
Owner HARBIN INST OF TECH
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