Hypergravity rotating bed for polymer devolatilization granulation and application method of hypergravity rotating bed

A supergravity rotating bed, polymer technology, applied in sustainable manufacturing/processing, climate sustainability, chemical industry, etc. The effect of devolatilization process and uniform size distribution

Active Publication Date: 2021-02-09
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still defects that the devolatilization and granulation processes are carried out separately

Method used

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  • Hypergravity rotating bed for polymer devolatilization granulation and application method of hypergravity rotating bed
  • Hypergravity rotating bed for polymer devolatilization granulation and application method of hypergravity rotating bed
  • Hypergravity rotating bed for polymer devolatilization granulation and application method of hypergravity rotating bed

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0108] This device is used to remove the volatile TDI in the polyurethane prepolymer. The experimental conditions are as follows: the rotation speed of the rotating bed is 200-2000r / min, the volume flow rate of the material is 50L / h, the devolatilization temperature is 110°C (the boiling point of TDI under vacuum is about 110°C), and the vacuum degree in the rotating bed is 0.99 MPa, the viscosity of the material is about 1Pa·s. The TDI content in the polyurethane prepolymer before and after devolatilization is detected by gas chromatography. At the speed of 2000r / min, this device can remove 80% of the TDI content in the polyurethane prepolymer, and the final TDI content is 800-1200ppm.

Embodiment 2

[0110] The device in Example 1 is adjusted to adjust the surface structure of the disc distributor, respectively image 3 As shown, it is found that the removal rate of final TDI has been improved to varying degrees. The devolatilization effect of the surface structure is straight baffle type > arc baffle type > spiral groove type > concentric groove type > cubic convex type. The removal rate of the optimal straight baffle type can be increased by 85%, and the TDI content can be reduced to 600-1000ppm.

Embodiment 3

[0112] On the basis of Example 2, a straight disc is used to further adjust the structure of the static deflector, which are respectively Figure 4 structure shown. The final TDI removal rate has been improved to varying degrees, and the best effect is the flexible plate structure, the flexible plate part is made of silica gel, the removal rate can be increased to 88%, and the TDI content can be reduced to 400-700ppm; followed by Straight plate type, again arc plate type structure.

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Abstract

The invention discloses a hypergravity rotating bed for polymer devolatilization granulation and an application method of the hypergravity rotating bed. The hypergravity rotating bed comprises a shell, a motor, a liquid inlet cavity, a multi-layer disc distributor, a rotor, a static flow guide piece, a granulation component, a discharging component and a gas outlet. According to the hypergravity rotating bed, the integrated process of volatile compound removal, granulation and discharging of thermoplastic polymers under the vacuum condition can be achieved, the series connection process of anexternal granulation device in the traditional plastic industry is avoided, and the occupied area and energy consumption are remarkably reduced. Meanwhile, the advantages of the hypergravity rotatingbed are exerted, so that volatile components are removed more thoroughly, and the granulated particle size is more uniform. By adjusting the structure of the granulation device and matching with different rotating speeds of the rotating bed, the morphology and the size of the granules can be controlled. The device and the method have important significance in the fields of plastic engineering, polymer engineering and hypergravity reactors.

Description

technical field [0001] The invention relates to a high-gravity rotating bed and its application. More specifically, it relates to a high-gravity rotating bed for polymer devolatilization and granulation and its application. Background technique [0002] In the process of polymerizing monomers into polymers, most of the final polymer products contain components with low relative molecular weight, namely volatile organic compounds (volatile organic compounds, VOC), referred to as "volatile", among them, solvents, Unreacted monomers and reaction by-products are volatile components. In order to ensure the quality of polymers while meeting safety factors and environmental protection, these volatiles in polymers must be removed. This process is called "polymer devolatilization process", and its importance is second only to the reaction process. [0003] Thermoplastic polymers such as polypropylene (PP), polyethylene (PE), polystyrene (PS) and other substances play an important r...

Claims

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Application Information

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IPC IPC(8): B29B9/06
CPCB29B9/06Y02P20/10
Inventor 初广文李燕斌罗勇陈建峰邹海魁孙宝昌
Owner BEIJING UNIV OF CHEM TECH
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