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Delivery spray nozzle, polytetrafluoroethylene fine particle processing method and apparatus using the spray nozzle

A technology of polytetrafluoroethylene and conveying nozzles, applied in lighting and heating equipment, conveyors, transportation and packaging, etc., can solve the problems of environmental pollution, limited application range, and low crushing efficiency

Active Publication Date: 2006-12-13
SHANGHAI 3F NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] 1. Since no suitable technical means for connecting the two processing sections has been found, the prior art has to adopt the operation of manual intermittent feeding of medium-sized polytetrafluoroethylene powder between the two processing sections, resulting in a particle size of only 100-300 The micron powder material pollutes the environment, this operation is labor-intensive and the material loss is large;
[0020] 2. The products produced by the existing technology have a wide particle size distribution and a large particle size, which affects the intrinsic performance of the product and limits the application range;
[0021] 3. The products produced by the existing technology have low crushing efficiency and high energy consumption;
[0022] 4. Due to the use of two-stage processing, the finished product of the first stage will be agglomerated and agglomerated
Such duplication of labor increases the cost of the product, increases energy consumption, and reduces productivity

Method used

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  • Delivery spray nozzle, polytetrafluoroethylene fine particle processing method and apparatus using the spray nozzle
  • Delivery spray nozzle, polytetrafluoroethylene fine particle processing method and apparatus using the spray nozzle
  • Delivery spray nozzle, polytetrafluoroethylene fine particle processing method and apparatus using the spray nozzle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0136] After the polymerized polytetrafluoroethylene coarse particles are smashed, washed and separated, they are then quantitatively sent to the cyclone dryer through the screw feeder. The speed of the screw feeder is 6r / min. The average particle size of the granular material is 249 μm, and the moisture content is 0.02%.

[0137] Pass the purified air at room temperature through a dehumidifier with a moisture content of 0.09g / m 3 , the distance s from the lower part of the baffle to the boundary of the jet flow is 15mm, the ratio d2 / d1 of the outlet diameter d1 of the jet pipe to the outlet diameter d2 of the shrinkage pipe is 1.9, and the ratio of the inlet diameter R of the medium-sized material inlet pipe 6 to the outlet diameter r The 3:1 conveying nozzle attracts the medium-sized material into the 3# cyclone separator, and the medium-sized material enters the chamber of the fluidized bed jet mill through the butterfly valve with the airflow. The opening and closing frequ...

Embodiment 2

[0140] After the polymerized polytetrafluoroethylene coarse particles are crushed, washed and separated, they are then quantitatively sent to the cyclone dryer through the screw feeder, and the speed of the screw feeder is 10r / min. The average particle size of the granular material is 212 μm, and the moisture content is 0.02%.

[0141] The purified normal temperature air passes through the dehumidifier with a moisture content of 0.12g / m 3 , the distance s from the lower part of the baffle to the boundary of the jet flow is 18mm, the ratio d2 / d1 of the outlet diameter d1 of the jet pipe to the outlet diameter d2 of the shrinkage pipe is 2.0, and the ratio of the inlet diameter R of the medium-sized material inlet pipe 6 to the outlet diameter r 3:2 conveying nozzles attract medium-grained materials into 3 # In the cyclone separator, the medium-grained material enters the cavity of the fluidized bed jet mill through the butterfly valve with the airflow. The opening and closing ...

Embodiment 3

[0144] The polytetrafluoroethylene coarse particles after the polymerization reaction are crushed, washed and separated, and then quantitatively sent to the cyclone dryer through the screw feeder. The rotation speed of the screw feeder is 18r / min. The average particle size of the granular material is 284 μm, and the moisture content is 0.02%.

[0145] The purified normal temperature air passes through the dehumidifier with a moisture content of 0.10g / m 3 , the distance s from the lower part of the baffle to the jet flow boundary is 17mm, the ratio d2 / d1 of the outlet diameter d1 of the injection pipe to the outlet diameter d2 of the shrinkage pipe is 2.3, and the ratio of the inlet diameter R to the outlet diameter r of the medium-sized material inlet pipe 6 The conveying nozzle is 3:1.5 to attract medium-grained materials into 3 # Cyclone separator, the medium-grained material enters the chamber of the fluidized bed jet mill through the butterfly valve with the airflow, and ...

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Abstract

The invention relates to a method for continuously preparing politef via suspension method, wherein said method breaks, washes, separates, dries and cools the polymerized politef, to obtain middle particles to be mixed with purified dry air; via cyclone separator, entering into the airflow breaker of fluid bed to be broken and classified; then the fine powder is collected in the collector to generate dry politef powder. The inventnion can continuously and automatically supply politef powder at high quality, in sealed tube.

Description

technical field [0001] The present invention relates to a process for processing polymeric materials and an apparatus for this process comprising special delivery nozzles. Specifically, the present invention relates to a method for processing polytetrafluoroethylene particles prepared by suspension polymerization into fine particles, a conveying nozzle suitable for the method, and a conveying nozzle for processing the polytetrafluoroethylene fine particles containing said conveying nozzle. Nozzle equipment. Background technique [0002] Polytetrafluoroethylene (PTFE for short) is a material with excellent performance. It is resistant to aging, has good chemical stability, excellent electrical insulation and good lubricity, and has a wide range of operating temperatures. It is widely used in various industries. [0003] PTFE is a long carbon chain thermoplastic polymer that can be prepared by suspension polymerization. PTFE obtained by the suspension method is mainly used t...

Claims

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Application Information

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IPC IPC(8): B65G53/04B02C23/02B02C19/00B02C19/06F26B5/08B02C23/00B02C23/08B02C25/00B02C18/06B02C18/18C08J3/12C08L27/18
Inventor 刘家禹粟小理
Owner SHANGHAI 3F NEW MATERIAL TECH CO LTD
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