GB/T 19590-2023Nanoscale calcium carbonate (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents" Drafting.

This document replaces GB/T 19590-2011 "Nano Calcium Carbonate". Compared with GB/T 19590-2011, except for structural adjustment and editing modifications, the main technical changes are as follows:

a) Added index requirements determined based on particle morphology (see Table 1);

b) Changed the main content, average particle size, and specific surface area indicators of nano-calcium carbonate (see Table 1, Table 1 of the 2011 version);

c) Added magnesium and iron content indicators and test methods (see Table 1, 6.5, 6.6);

d) The indicators and test methods of grain size and agglomeration index are deleted (see Tables 1, 6.5, and 6.7 of the 2011 version);

e) The average particle size test method has been changed (see 6.2, 6.4 of the 2011 edition).

1 Scope

This document specifies the requirements, test methods, inspection rules, and markings for nano-calcium carbonate (including ultrafine calcium carbonate and some fine calcium carbonate) and accompanying documentation, packaging, shipping and storage.

This document applies to nanometer calcium carbonate powder.

Note: This product is mainly used in rubber, plastics, sealants, adhesives, offset inks and coatings, etc.

2 Normative reference documents

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, the dated quotations For undated referenced documents, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to this document.

GB/T 191-2008 Packaging, storage and transportation pictorial markings

GB/T 6678 General principles for sampling of chemical products

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

GB/T 19281-2014 Calcium carbonate analysis method

GB/T 19587 Determination of specific surface area of solid materials by gas adsorption BET method

3 Terms and definitions

There are no terms or definitions to be defined in this document.

4 Molecular formula and relative molecular mass

Molecular formula: CaCO3.

Relative molecular mass: 100.09 (according to the 2022 international relative atomic mass).

5 Requirements

5.1 Appearance: white powder.

5.2 Morphology: cube, quasi-cube, rhombohedron, nearly spherical, rod-shaped, needle-shaped or chain-shaped in electron microscope imaging.

5.3 Nano-calcium carbonate should be tested according to the test methods specified in this document and should comply with the requirements in Table 1. […]