GB/T 26824-2020Nanoscale alumina (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 Standardization Guidelines Part 1: Structure and Drafting Rules of Standardization Documents Drafting.

This document replaces GB/T 26824-2011 "Nano Alumina", compared with GB/T 26824-2011, except for structural adjustment and editorial In addition to the changes, the main technical changes are as follows:

a) Added introduction;

b) Modified the scope of application of the document (see Chapter 1, Chapter 1 of the 2011 edition);

c) Some reference documents have been added (see Chapter 2);

d) Added terms and definitions (see Chapter 3);

e) Modified product classification and added product code (see Chapter 4, Chapter 3 of the 2011 edition);

f) The technical indicators and requirements of nano alumina have been deleted, and the technical requirements of nano alumina prepared by liquid phase method and gas phase method have been added.

The technical requirements of nano alumina (see Table 1, Table 2, and Table 1 of the 2011 edition);

g) The test requirements for the pH value and microscopic morphology of the suspension have been added; the silica, ferric oxide, sodium oxide, calcium oxide, oxygen Reference method for determination of magnesium content (see Chapter 6, Chapter 5 of the 2011 edition);

h) Added sampling (see Chapter 7);

i) Modified the inspection rules (see Chapter 8, Chapter 6 of the 2011 edition);

j) Combine packaging, labeling, storage and transportation into one chapter (see Chapter 9, Chapter 7 and Chapter 8 of the 2011 edition).

Introduction

Nano alumina is a new nano material with corrosion resistance, high temperature resistance, high hardness and easy dispersion. It has been used in battery diaphragms, catalyst carriers, ceramics Many fields such as coating and polishing have been widely used. The industrial preparation methods of nano alumina mainly include liquid phase method and gas phase method.

The nano-alumina prepared by the same process method exhibits unique properties in terms of crystal form, morphology and performance, making it suitable for different applications The directions show their respective performance advantages. For example, the liquid phase method can produce high-purity alpha-crystal nano alumina, which can be used in laser crystals and lithium battery diaphragms.

The application of coatings, thermally conductive powders and ceramic coatings is in the ascendant; the liquid phase method can also be used to obtain high-purity gamma-crystalline nano-alumina.

The high-efficiency catalyst carrier for automobile and chemical exhaust gas exhibits broad application value. Nano alumina prepared by gas phase method is generally gamma crystal Type-based mixed crystals, the microscopic morphology of particle aggregation is dendritic, anti-ultraviolet coatings, powder coatings, catalysts in phosphors and energy-saving fluorescent lamps There are unique applications in the fields of chemical carrier and polishing.

This document has established corresponding requirements in combination with the technical requirements of the preparation process and application fields, which is conducive to the accurate characterization and evaluation of the upstream and downstream industries Nano alumina has important guiding significance for promoting the promotion and application of nano alumina in a wider range. Nano alumina

1 Scope

This document specifies the product classification and code, technical requirements, test methods, sampling, inspection rules, packaging, labeling, and storage of nano alumina. Storage and transportation.

This document is applicable to the quality inspection and acceptance of nano-alumina prepared by liquid phase method and gas phase method. Nano alumina prepared by other processes Can refer to implementation. Alumina molecular formula. Al2O3.

2 Normative references

The contents of the following documents constitute indispensable clauses of this document through normative references in the text. Among them, dated quotations Only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document.

GB/T 191 Packaging, Storage and Transportation Graphic Mark

GB/T 6609.2 Alumina chemical analysis method and physical property determination method Part 2. 300°C and 1000°C mass loss Determination of

GB/T 6678 General Rules for Sampling of Chemical Products

GB/T 6679 General Rules for Sampling of Solid Chemical Products

GB/T 8170 Numerical rounding rules and the expression and determination of limit values

GB/T 19587-2017 Gas adsorption BET method for determination of specific surface area of solid matter

GB/T 20020-2013 Fumed silica

GB/T 30544.4 Nanotechnology terminology Part 4: Nanostructured materials

GB/T 30904 Inorganic chemical products crystal structure analysis X-ray diffraction method

GB/T 37248 High purity alumina-Determination of trace metal elements-Inductively coupled plasma emission spectrometry

3 Terms and definitions

The following terms and definitions defined in GB/T 30544.4 apply to this document.