Multi-order screw extrusion type polyolefin halogenation equipment and polyolefin halogenation method

A technology of screw extrusion and polyolefin, which is applied in bromination, fluorination of polyolefin, chlorination, and chemical equipment fields, can solve the problems of unfulfilled chlorine content requirements, etc., and achieve the reduction of equipment corrosion resistance requirements, halogen atom evenly distributed effect

Active Publication Date: 2017-12-12
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is far from achieving the 35±2% chlorine content requirement of the current enterprise's chlorinated CPE

Method used

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  • Multi-order screw extrusion type polyolefin halogenation equipment and polyolefin halogenation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Such as figure 1 As shown, a schematic diagram of a three-stage screw extrusion halogenation equipment containing structure II.

[0074] The granular or powdery polyolefin to be halogenated is physically blended with other additives (initiator, catalyst, etc.) and then melted, plasticized and uniformly mixed in the twin-screw extruder 1; the diameter of the screw is D, and the ratio of length to diameter is L / D is about 25-35D, preferably 30; the screw and barrel are made of conventional screw extrusion alloy (such as 38CrMoAl), and the surface is nitriding treatment. The mixing section of the screw adopts the combined structure of thread and meshing block. The length of the mixing section is about 5-10D. The front end of the machine head is directly connected to the feeding section of the next-stage halogenation reaction extruder. Pumped to the next stage halogenation extruder 3. Extruder 3 is a parallel twin-screw or triple-screw extruder. The twin-screw extruder ...

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Abstract

The invention provides a multi-order screw extrusion type polyolefin halogenation equipment and a polyolefin halogenation method, and belongs to the field of chemical equipment. The multi-order screw extrusion type polyolefin halogenation equipment comprises N-order extruders connected in series, every two adjacent extruders are connected through a single screw or a screw pump in a closed mode; the inlet end of a machine barrel of each single screw or each screw pump is connected to the extruder head of a last-order extruder, and the outlet end of the machine barrel of each single screw or each screw pump is connected to the extruder tail of a next-order extruder; the screws of the N-order extruders are formed by connecting building block type composite structures in series; a feed port is formed in a first-order extruder; and air inlets and air outlets are formed in the other-order extruders.

Description

technical field [0001] The invention belongs to the field of chemical equipment, and specifically relates to a multi-stage screw extrusion type polyolefin halogenation equipment and a polyolefin halogenation method. It is a series combination of multi-stage extruders that are environmentally friendly, corrosion-resistant, zero-emission, and low-energy consumption. It is widely used in the fields of fluorination, chlorination and bromination of polyolefins. Background technique [0002] In recent years, with the country's emphasis on environmental protection and the gradual improvement of the environmental protection emission standards of the chemical industry, domestic polyolefin halogenated production enterprises are facing the dual challenges of technology upgrading and cost increase. Taking chlorinated polyethylene (CPE) as an example, 70-80% of the world's production is concentrated in mainland China, and it is mainly used in the modification of polyolefins and the tough...

Claims

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Application Information

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IPC IPC(8): B29B9/06B29C47/38B29C47/64C08F8/20C08F10/00B29K23/00B29C48/395B29C48/67
CPCB29B9/06B29K2023/00B29C48/022B29C48/40B29C48/425B29C48/67C08F8/20C08F10/00B29B7/487B29B7/748B29B7/845B29B7/86
Inventor 张立群林祥任冬云张保发王兴为
Owner BEIJING UNIV OF CHEM TECH
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