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Nanotechnologies - Characteristics and measurement methods of air filter media containing polymeric nanofibers
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Basic data Standard ID | GB/Z 44235-2024 (GB/Z44235-2024) | Description (Translated English) | Nanotechnologies - Characteristics and measurement methods of air filter media containing polymeric nanofibers | Sector / Industry | National Standard | Classification of Chinese Standard | L04 | Classification of International Standard | 07.120 | Word Count Estimation | 20,274 | Date of Issue | 2024-08-23 | Date of Implementation | 2024-08-23 | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration |
GBZ44235-2024: Nanotechnologies - Characteristics and measurement methods of air filter media containing polymeric nanofibers ---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
GB /Z 44235-2024.Nanotechnology - Characteristics and measurement methods of air filter media containing polymer nanofibers
Guiding technical documents of the People's Republic of China on national standardization
ICS 07.120CCS L 04
Nanotechnology containing polymer nanofibers
Air filtration media characteristics and measurement methods
Nanotechnologies-Characteristics and measurement methods of air
filter media containing polymeric nanofibers
(ISO /TS 21237.2020, Nanotechnologies-Air filter media containing polymeric
nanofibers-Specification of characteristics and measurement methods, IDT)
2024-08-23 Release
2025-03-01 Implementation
State Administration for Market Regulation
The National Standardization Administration issued
Table of Contents
Preface Ⅲ
Introduction Ⅳ
1 Scope...1
2 Normative references 1
3 Terms and Definitions 1
4 Abbreviations 2
5 Characteristics to be measured and their measurement methods 2
5.1 Overview 2
5.2 Basic characteristics and optional characteristics and their measurement methods 2
5.3 Description of characteristics and their measurement methods 3
5.3.1 Overview 3
5.3.2 Fiber diameter 3
5.3.3 Morphology 3
5.3.4 Specific surface area 4
5.3.5 Chemical composition 4
5.3.6 Thermal stability 4
5.3.7 Crystal structure 4
5.3.8 Crystallinity 5
5.3.9 Grain size 5
6 Report...5
Appendix A (Informative) Typical Structure of Nanofiber Air Filter Media 6
Appendix B (Informative) Test report format for basic characteristics 8
Appendix C (Informative) Test report format for optional characteristics 9
References ...10
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting is required.
This document is equivalent to ISO /TS 21237-2020 "Nanotechnology-based air filter media properties and performance of polymer nanofibers"
The document type of "Specification for Measurement Methods" was adjusted from ISO technical specifications to my country's national standardization guiding technical documents.
The following minimal editorial changes were made to this document.
--To coordinate with the existing standard, the name of the standard is changed to "Nanotechnology-based Air Filter Media Characteristics Containing Polymer Nanofibers"
and measurement methods.
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document was proposed by the Chinese Academy of Sciences.
This document is under the jurisdiction of the National Technical Committee on Nanotechnology Standardization (SAC/TC 279).
This document was drafted by. Institute of Basic Medicine, Chinese Academy of Medical Sciences, Jiaxing Furuibang New Materials Technology Co., Ltd., Chinese Academy of Sciences
Suzhou Institute of Nano-Tech and Nano-Bionics.
The main drafters of this document are. Liu Jian, Wen Tao, Xu Haiyan, Zhao Xinglei, Jiang Pan, Hua Ting, Zhang Xuetong and Sheng Zhizhi.
Introduction
Air filter media plays an important role in the performance and efficiency of different types of air filters. Most air filter media utilizes nonwoven
The material separates solid or liquid particles. Air filter media are widely used, such as gas turbine air intake, industrial dust removal, respiratory masks, personal
Protective equipment, heating, ventilation and air conditioning systems, clean rooms, etc.
In recent years, air filter media containing nanofibers have been widely used due to their high filtration efficiency and low pressure drop characteristics brought about by the slip flow effect (see
Reference [5]), has been commercialized and widely used in different industries. Air filter media containing nanofibers are usually prepared by spinning
The nanofibers are directly deposited on the surface of a suitable porous substrate.
Since the diameter of nanofibers is significantly smaller than that of conventional microfibers used in filters, the probability of inertial collision and interception can be increased.
At the same time, slip flow can also reduce pressure drop, allowing more pollutants to flow through the nanofiber surface, thus
It can also improve inertial collision and interception efficiency. Under the same pressure drop, the filtration capacity of the nanofiber layer is better than that of the traditional fiber layer.
In addition, the high specific surface area of nanofibers helps to absorb pollutants from the air. These advantages make air filter media containing nanofibers
Widely used in air filtration (see references [5][6][7]).
Air filter media containing nanofibers can be manufactured by different techniques such as electrospinning and centrifugal spinning.
The crystal structure, morphology and diameter of the fibers are different, and they are deposited on the surface of the substrate to form a mesh nonwoven layer. The specific surface area of the nonwoven layer and the pores of the interpenetrating fibers
The porosity is mainly affected by the diameter and morphology of nanofibers.
Polyester (PU) and other polymer nanofibers are commonly used in air filtration media. Nanofibers can be deposited on different types of textiles or
Appendix A shows a schematic cross-sectional view of an air filter medium containing nanofibers (see Figure A.1) and its typical structure, shape, and
SEM images of morphology and texture (see Figures A.2 and A.3).
This document helps to facilitate communication between suppliers and buyers and supports the growing trade in this new type of air filtration media.
Nanotechnology containing polymer nanofibers
Air filtration media characteristics and measurement methods
1 Scope
This document specifies the properties that should be measured for air filter media containing polymer nanofibers on the substrate surface and describes the corresponding measurement methods.
method.
This document does not address health and safety related characteristics.
Note. Use relevant published standards to evaluate the application-related properties/performance of air filtration media. Use test methods appropriate to the specific application.
Measure the physical properties and performance of filter media such as pressure drop and particle removal efficiency.
2 Normative references
This document has no normative references.
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
air filter
filter
A device for separating solid or liquid particles (3.6) or gaseous pollutants from a passing gas stream.
NOTE 1 The device is typically composed of one or more layers of porous, fibrous or granular material.
Note 2.Air filters specifically refer to the use of filtering to purify the air flowing through them, while air purifiers do not limit their specific methods of reducing air pollution.
[Source. ISO 29464.2017, 3.1.16, modified]
3.2
air filter medium
Permeable porous material used during filtration (3.3) to capture or deposit the filtrate
NOTE. The filter medium consists of a nanofiber (3.5) layer and a substrate (3.7).
[Source. GB/T 18690.1-2009, 2.27, modified]
3.3
Filtration
The activity of separating suspended contaminants from a fluid by retaining them (also includes the construction and commissioning of filtration equipment).
activities involved in the placement).
[Source. ISO 29464.2017, 3.5.29]
3.4
Nanoscale
The length range is approximately between 1 nm and 100 nm.
[Source. ISO 80004-1.2023, 3.1.1]
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