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A method for controlling the bulk density of polyperfluoroethylene propylene resin powder

A technology of polyperfluoroethylene propylene and resin, which is applied in the field of polymer emulsion preparation to achieve small fluctuations in bulk density, facilitate industrial production, and be environmentally friendly

Active Publication Date: 2020-04-17
ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem of controllable volume density of polyperfluoroethylene propylene resin powder, the present invention provides a method suitable for industrial production to control the volume density of polyperfluoroethylene propylene resin powder; The agent will not pollute the resin powder, and can effectively control the volume density of the polyperfluoroethylene propylene resin powder by controlling the amount of volatile additives added, and the added volatile additives will not affect the subsequent drying of the resin. can be effectively removed without polluting the resin, the method is environmentally friendly and conducive to industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] This embodiment provides a method for controlling the bulk density of polyperfluoroethylene propylene resin powder, including:

[0025] Add normal temperature (25°C) non-ionized water to 3000g polyperfluoroethylene propylene emulsion (resin dry material 750g), adjust the specific gravity of the emulsion to 1.05, add 20g ammonium bicarbonate, control the stirring speed at 1400 rpm, and mechanically coagulate for 25 minutes , Add 12g of ammonia water, continue to agglomerate for 15 minutes, the polyperfluoroethylene propylene emulsion is completely demulsified, and the polyperfluoroethylene propylene after demulsification is washed with non-ionized water at room temperature (25℃), the washing time is 3min, and the washing is repeated After 9 times, the water content of the polyperfluoroethylene propylene resin powder was 28%, and it was dried at 120° C. for 14 hours. The bulk density of the polyperfluoroethylene propylene resin powder was measured to be 215 g / l.

Embodiment 2

[0027] This embodiment provides a method for controlling the bulk density of polyperfluoroethylene propylene resin powder, including:

[0028] Add normal temperature (25°C) non-ionized water to 3000g polyperfluoroethylene propylene emulsion (resin dry material 778g), adjust the specific gravity of the emulsion to 1.05, add 11g of ammonia water, control the stirring speed at 800 rpm, and when the mechanical agglomeration is 28 minutes, make up Add 8g of ammonium bicarbonate, continue to coagulate for 10 minutes, the polyperfluoroethylene propylene emulsion is completely demulsified, the polyperfluoroethylene propylene after demulsification is washed with normal temperature (25℃) ion-free water, the washing time is 3min, and the washing is repeated After 5 times, the water content of the polyperfluoroethylene propylene resin powder was 28%, and it was dried at 120° C. for 14 hours. The bulk density of the polyperfluoroethylene propylene resin powder was measured to be 55 8 g / l.

Embodiment 3

[0030] This embodiment provides a method for controlling the bulk density of polyperfluoroethylene propylene resin powder, including:

[0031] Add normal temperature (25°C) deionized water to 3500g of polyperfluoroethylene propylene emulsion (resin dry material 980g), adjust the specific gravity of the emulsion to 1.05, add 10g of ammonia, and control the stirring speed at 1600 rpm. Add 10g of ammonium bicarbonate and continue to condense for 10 minutes. The polyperfluoroethylene propylene emulsion is completely demulsified. The polyperfluoroethylene propylene after demulsification is washed with normal temperature (25℃) ion-free water, and the washing time is 3min. Repeated washing After 6 times, the water content of the polyperfluoroethylene propylene resin powder was 27%, and it was dried at 120° C. for 14 hours, and the bulk density of the polyperfluoroethylene propylene resin powder was measured to be 850 g / l.

[0032] Effectiveness verification

[0033] Comparison of the perfl...

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Abstract

The invention relates to a method for controlling the volume density of polyperfluorinated ethylene propylene resin powder. The method comprises the following steps: (1) adding ion-free water into polyperfluorinated ethylene propylene emulsion at room temperature and adjusting the emulsion proportion to be 1.03 to 1.20; adding an auxiliary agent into the emulsion obtained by step (1); stirring andcontinually supplementing ammonia water or ammonium bicarbonate; stirring until the polyperfluorinated ethylene propylene emulsion is completely subjected to emulsion breaking, wherein the auxiliaryagent is the ammonia water or the ammonium bicarbonate; (3) washing powder, which is separated by the emulsion breaking, with de-ionized water at room temperature, so as to obtain the polyperfluorinated ethylene propylene resin powder with the density of 80 to 900g / l. According to the method provided by the invention, under a room temperature condition (at 20 to 25 DEG C), the volume density of the powder is controlled through adding the volatile auxiliary agent in a mechanical coagulation process in batches; the added volatile auxiliary agent can be effectively removed in a subsequent resindrying process and the resin is not polluted; the fluctuation of the volume density of the polyperfluorinated ethylene propylene resin powder is relatively small; the method is environmentally friendly and has moderate conditions, and the industrial production is facilitated.

Description

Technical field [0001] The invention relates to a method for controlling the bulk density of polyperfluoroethylene propylene resin powder, and belongs to the technical field of polymer emulsion preparation. Background technique [0002] Polyfluoroethylene propylene resin (FEP) is a thermoplastic resin with good processing properties, excellent high and low temperature resistance and excellent chemical stability. Its most outstanding performance is electrical insulation (for example, its dielectric The constant is 2.1). Excellent electrical insulation performance and easy processing performance, low flame spread, low smoke generation characteristics, so that the copolymer is mainly used as an insulating material in integrated circuit boards and wires and cables. The copolymer can be made into various forms of products by general thermoplastic processing methods, such as extrusion, molding, and spraying processing methods, making it widely used in the electronic and electrical ind...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/12C08L27/18
Inventor 余金龙汪仲权张廷健
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD