The spread of small particles poses a huge threat to human health, and the use of air filtration materials is currently an important means to solve this problem. Therefore, air filtration materials play an important role in people's daily lives. Polypropylene melt blown non-woven fabric material has been widely used in the fields of medical and health protection, as well as air purification filters, such as PM2.5 masks, disposable medical masks, and more HEPA( High Effciency Particulate Air Filter)、ULPA(Ultra Low Penetration Air Filter) Material Science. Usually, in order to improve the filtration efficiency of materials, fiber fineness is reduced and fiber tightness is increased, but the filtration resistance of materials is greatly increased.

In the research and development process of air filtration materials, filtration resistance and filtration efficiency have always been contradictory. As an air filtration material, it is necessary to balance the relationship between the two. Electrification treatment can effectively solve the contradiction between filtration resistance and filtration efficiency, making the filter material more efficient and low resistance in terms of filtration capacity. The charged meltblown fiber mesh after polarization treatment can effectively filter submicron particles in the air and reduce the spread of particles that can enter the lungs.

Conduct scanning electron microscopy, infrared spectroscopy, X-ray photoelectron spectroscopy, permeability testing, and other tests on polypropylene meltblown polarizing filter materials to analyze the impact of corona charging on polypropylene meltblown materials, laying the foundation for finding methods to improve the polarizing effect in the future. By establishing a BP artificial neural network model, analyze the correlation between process parameters and polarization effect, and predict performance through parameters.

ICAN9 Fourier Transform Infrared Spectrometer for Infrared Spectroscopy Testing (FTIR) of Polypropylene Meltblown Fabric, the Main Material of Masks:

The wavenumber range of infrared spectroscopy (IR) is approximately 12800-10cm-l, or divided into three regions based on wavelength: near-infrared (0.75-2.5 μ m), mid infrared (2.5-25 μ m), and far-infrared (25-1000 μ m). Infrared spectroscopy is a molecular vibrational absorption spectrum that utilizes the absorption of infrared radiation by molecules of a substance to obtain an infrared spectrum corresponding to the molecular structure. Infrared spectroscopy analysis is an important means of studying the relationship between material molecular structure and infrared absorption, and can be effectively applied to the analysis of molecular structure. It is one of the fundamental methods for characterizing and studying the structural properties of polymers. Fourier Transform Infrared Spectroscopy (FTIR) is a spectroscopic technique based on the theory of molecular vibration and rotation. This method utilizes the iCAN9 Fourier Transform Infrared Spectrometer to provide the characteristic frequencies of chemical bonds or functional groups. The characteristic frequencies of molecular functional groups (4000-1333 cm-1) and infrared "fingerprints" (133-650 cm-1) can be used for qualitative and quantitative analysis of organic and inorganic compounds, and their molecular structures can be determined. This experiment uses Fourier transform infrared spectroscopy to analyze the molecular structure changes of polypropylene melt blown non-woven fabric before and after polarization

Compare the effects of corona high-voltage charging on the structure of melt blown non-woven fabrics. Test conditions: Wrap the sample around the test plate and scan it 32 times, with a scanning range of 4000~650 CEMR, using the single point ZnSe crystal method for testing.

The iCAN9 Fourier Transform Infrared Spectrometer is used to analyze the infrared spectra of the main material of masks, polypropylene meltblown fabric, before and after polarization

1.Instruments and accessories

Instrument:

iCAN9Fourier transform infrared spectrometer

Enclosure:

ATRAttenuation total reflection method attachment:

ATRAttenuated total reflection attachment（ZnSeCrystal, single reflection45°Incident)

2.test conditions

Test mode: attenuated total reflection

Wavelength range:4000~650cm-1

Resolution:4cm-1

Scanning frequency:32time

3.test method

ATRAttenuation total reflection method:

Fix the test sample in placeATRThe surface of the attached crystal can be tested

The infrared spectra of polypropylene material before and after polarization are shown in the figure. From the figure, it can be seen that the infrared spectrum of untreated polypropylene material shows not only CH2 bending vibration at 1456cm-1, but also a strong CH3 bending vibration band appearing at 1375cm-1. The stretching vibration of CH3 and CH overlaps with the stretching vibration of CH2, appearing in multiple peaks at 2837-2949cm-1. The characteristic peaks of [CHCH (CH3)] n appear at 972 and 1167cm-1, and there are also a series of harmonic bands related to crystallization at 841 and 997 cm-1. The infrared spectrum of the material after polarization is the same as the untreated characteristic peaks, and there is no change in the absorption position shift, indicating that the polarization treatment did not change the internal macromolecular chain structure of the polypropylene material.