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Method for detecting PTFE emulsion particles based on scanning electron microscope

A technology of PTFE and scanning electron microscopy, which is applied in the field of microscopic scanning, can solve the problems of particle agglomeration, incapability of imaging, and inability to observe the morphology of primary particles, etc., and achieve the effect of dense emulsion particles, clear boundaries, and high resolution

Active Publication Date: 2021-02-26
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

The mainstream scanning electron microscope sample preparation must fully replace the water in the sample, so as to avoid the discharge of the water vapor generated by the electron beam bombardment of the sample when it encounters the ionization of the high-energy electron current during the scanning electron microscope observation, resulting in the failure of imaging
However, during the water evaporation process of the sample, the emulsifier system of PTFE particles is easily agglomerated, and the primary particle morphology cannot be observed.

Method used

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  • Method for detecting PTFE emulsion particles based on scanning electron microscope
  • Method for detecting PTFE emulsion particles based on scanning electron microscope
  • Method for detecting PTFE emulsion particles based on scanning electron microscope

Examples

Experimental program
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Embodiment 1

[0025] The present embodiment provides a kind of detection method to PTFE emulsion particle based on scanning electron microscope, specifically:

[0026] Accurately weigh 2 g of PTFE emulsion, dissolve it in 80 ml of deionized water, set the volume to 100 ml in a volumetric flask, and prepare solution A. Take 1ml of solution A with a pipette, dilute to 100ml with deionized water, and prepare a 0.02% PTFE dispersion emulsion.

[0027] Accurately weigh 2g of sodium hexametaphosphate powder, dissolve it in deionized water and make it up to 1L to prepare solution B. Take 1ml of solution B with a pipette, dilute to 100ml with deionized water, and prepare a 0.002% sodium hexametaphosphate solution.

[0028] Take 40ml of the above-mentioned 0.02% PTFE dispersion emulsion and 10ml of 0.002% sodium hexametaphosphate solution, put them in a beaker, add 1 drop of absolute ethanol dropwise, stir, set the ultrasonic power to 100W, and ultrasonic for 15min to prepare a sample solution for ...

Embodiment 2

[0033] The present embodiment provides a kind of detection method to PTFE emulsion particle based on scanning electron microscope, specifically:

[0034] Accurately weigh 1g of PTFE emulsion, dissolve it in 15ml of deionized water, and make it up to 500ml in a volumetric flask to make solution A; take 10ml of solution A with a pipette, make it up to 1000ml with deionized water, and make it into 0.02% PTFE dispersion emulsion.

[0035]Accurately weigh 1g of sodium hexametaphosphate powder, dissolve it in deionized water and adjust the volume to 500ml to prepare solution B. Take 1ml of solution B with a pipette, dilute to 100ml with deionized water, and prepare a 0.002% sodium hexametaphosphate solution.

[0036] Take 50ml of the above-mentioned 0.02% PTFE dispersion emulsion and 50ml of 0.002% sodium hexametaphosphate solution, put them in a beaker, add 2 drops of absolute ethanol dropwise, stir, set the ultrasonic power to 100W, ultrasonic 25min, and make a sample solution fo...

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Abstract

The invention relates to a method for detecting PTFE emulsion particles based on a scanning electron microscope, which comprises the steps of respectively preparing a PTFE dispersion emulsion and a sodium hexametaphosphate solution when a sample to be detected is prepared, and sufficiently mixing the PTFE dispersion emulsion and the sodium hexametaphosphate solution. According to the method provided by the invention, the sodium hexametaphosphate solution is adopted to replace an emulsifying system in the original emulsion, so that the sample is not agglomerated due to the damage of the emulsifying system in the drying process, and the microstructure of the sample is not damaged. According to the method, various parameters in the sample preparation and scanning process are further optimized, so that the obtained image retains the microtopography of emulsion particles to the maximum extent, the emulsion particles are dense, the boundary is clear, the resolution is high, and conditions can be provided for further accurate measurement and analysis of the particle size.

Description

technical field [0001] The invention belongs to the technical field of microscopic scanning, and in particular relates to a detection method for PTFE emulsion particles based on a scanning electron microscope. Background technique [0002] Polytetrafluoroethylene (PTFE) emulsion, also known as PTFE emulsion, refers to the diffusion of tetrafluoroethylene monomer TFE into the aqueous solution in the form of gas, and begins to polymerize under the action of an initiator to form PTFE particles. Precipitates out of the aqueous phase to form a mixed liquid-like substance. A large number of PTFE particles in the emulsion grow into primary latex particles with different shapes and different particle size distributions under the action of initiators and surfactants, and the morphological differences of these primary particles will greatly affect the subsequent processing of the resin. Processing properties, such as extrusion pressure, processing temperature, etc., then affect its p...

Claims

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Application Information

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IPC IPC(8): G01N23/2251G01N23/2202
CPCG01N23/2251G01N23/2202G01N2223/09G01N2223/102G01N2223/635
Inventor 宋亦兰李慧王雯霞
Owner ZHONGHAO CHENGUANG RES INST OF CHEMICALINDUSTRY CO LTD