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Method for increasing volume density of powder lot of fluorinated ethylene propylene resin

A polyperfluoroethylene propylene and bulk density technology, which is applied in the field of fluorine chemical industry, can solve the problems such as the inability to correctly measure the amount of powder feeding, the difficulty in removing volatile substances, and the inability of the material to fill the screw chamber, so as to improve the difficult processing performance, The effect of easy transportation, reduced input and labor

Inactive Publication Date: 2007-07-25
SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The condensed powder can be directly granulated by the screw, but it is very difficult and has many disadvantages, such as: the feeding amount of the powder cannot be measured correctly, the feeding screw is seriously stored when the powder is fed, and the bulk density of the powder Small, so that the material cannot fill the screw bore in the screw, the production efficiency is low, and the low-molecular substances and volatile substances produced by the powder at high temperature are difficult to come out, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: add tetrachlorethylene

[0028] The powder and the organic solvent tetrachlorethylene are mixed uniformly according to the mass volume ratio of 1:1, and then added into the same volume of pure water. Start to heat up, and start stirring, and the stirring speed is 900 rpm. When the temperature reaches 90°C, stir at a constant temperature for 20 minutes, and the material is huddled into large groups in granular form and sinks in the solvent phase under the water phase. Raise the temperature to keep the temperature constant at 115°C, volatilize and recover the organic solvent, stop heating and stirring after the volatilization is complete, and release the material. Among them, it can be seen that the material floats on the liquid surface in the form of small particles, and remains as particles after drying. The water content of the polyperfluoroethylene propylene resin particles obtained through the test is 17.05%, the volume density is increased compared w...

Embodiment 2

[0029] Embodiment 2: Add dichloroethylene

[0030] The powder and the organic solvent dichloroethylene are mixed evenly at a mass volume ratio of 1:2, and then added to the same volume of pure water. Start to heat up, and start stirring, and the stirring speed is 800 rpm. When the temperature reaches 90°C, stir at a constant temperature for 30 minutes, and the material is huddled into large groups in granular form and sinks in the solvent phase under the water phase. Raise the temperature to keep the temperature constant at 115°C, volatilize and recover the organic solvent, stop heating and stirring after the volatilization is complete, and release the material. It can be seen that the material floats on the liquid surface in the form of small particles, which are still particles after drying. The water content of the polyperfluoroethylene propylene resin particles obtained through the test is 20.9%, the volume density is increased compared with that before the test, and the...

Embodiment 3

[0031] Embodiment 3: add acetone

[0032] The powder and the organic solvent acetone are mixed evenly at a mass volume ratio of 1:3, and then added into the same volume of pure water. Start to heat up, and start stirring, and the stirring speed is 700 rpm. When the temperature reaches 90°C, stir at a constant temperature for 40 minutes, and the material is huddled into large groups in granular form and sinks in the solvent phase under the water phase. Raise the temperature to keep the temperature constant at 115°C, volatilize and recover the organic solvent, stop heating and stirring after the volatilization is complete, and release the material. It can be seen that the material floats on the liquid surface in the form of small particles, which are still particles after drying. The water content of the polyperfluoroethylene propylene resin particles obtained through the test is 34.1%, the volume density is increased compared with that before the test, and the performance rem...

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Abstract

This invention discloses a method for increasing the volume density of perfluoroethylene-perfluoropropylene copolymer resin powder. The method can adjust the particle sizes of perfluoroethylene-perfluoropropylene copolymer resin powder by adding volatile organic solvent into aqueous medium at 60-115 deg.C under high-speed stirring, thus realizing the increase of the volume density of perfluoroethylene-perfluoropropylene copolymer resin powder.

Description

technical field [0001] The invention relates to a post-treatment process of polyperfluoroethylene propylene resin, in particular to a method for increasing the volume density of polyperfluoroethylene propylene resin powder, and belongs to the technical field of fluorine chemical industry. Background technique [0002] Polyfluoroethylene propylene copolymer (FEP), also known as fluoroplastic-46 (F46), is a copolymer of tetrafluoroethylene and hexafluoropropylene, which is a transparent particle (suspension polymer) or water dispersion (emulsion polymer) . The mechanical properties, chemical stability, electrical insulation, lubricity, non-stickiness, aging resistance, and non-combustibility of the resin are basically the same as those of polytetrafluoroethylene. Its outstanding advantage is that it has thermoplasticity and can be processed by commonly used thermoplastics. methods, such as extrusion, injection molding, transfer molding and other molding. Due to the low gauge...

Claims

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Application Information

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IPC IPC(8): C08J3/12C08L27/18C08L27/20
Inventor 王晶晶王汉利苗忠杰刘中平
Owner SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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