GB/T 5211.9-2025General methods of test for pigments and extenders - Part 9: Comparision of resistance to light of coloured pigments of similar types (English PDF)

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.

This document is Part 9 of GB/T 5211.GB/T 5211 has been published in the following parts.

--- Determination of water-soluble pigment matter by cold extraction method (GB/T 5211.1);

--- Determination of water-soluble pigment matter by hot extraction method (GB/T 5211.2);

--- General test methods for pigments and extenders - Part 3: Determination of volatile matter at 105 °C (GB/T 5211.3);

--- Determination of pigment packing volume and apparent density (GB/T 5211.4);

--- Determination of pigment resistance (GB/T 5211.5);

--- General test methods for pigments and extenders - Part 6: Determination of pH of aqueous suspensions (GB/T 5211.6);

--- General test methods for pigments and extenders - Part 9: Comparison of lightfastness of coloring pigments of the same type (GB/T 5211.9);

--- Determination of water-soluble sulfate, chloride and nitrate of pigments (GB/T 5211.11);

--- Determination of resistivity of aqueous extracts of pigments (GB/T 5211.12);

--- Determination of pH of aqueous pigment extracts (GB/T 5211.13);

--- General test methods for pigments and extenders - Part 14: Determination of sieve residue - Mechanical flushing method (GB/T 5211.14);

--- General test methods for pigments and extenders - Part 15: Determination of oil absorption (GB/T 5211.15);

--- Comparison of tinting power of white pigments (GB/T 5211.16);

--- Comparison of white pigment contrast ratio (hiding power) (GB/T 5211.17);

--- General test methods for pigments and extenders - Part 18: Determination of sieve residue - Water method (manual) (GB/T 5211.18);

--- Determination of relative tinting strength and dilute color of coloring pigments - Visual comparison method (GB/T 5211.19);

--- Colorimetric method for comparison of the colors of white, black and coloring pigments in the true color system (GB/T 5211.20).

This document replaces GB/T 1710-2008 "Comparison of lightfastness of similar coloring pigments". Compared with GB/T 1710-2008, except for the structural adjustment in addition to the integration and editorial changes, the main technical changes are as follows.

a) Added "colorimeter" (see 5.5);

b) "Base material (medium)" has been changed (see 5.7, 4.6 of the 2008 edition);

c) Added a schematic diagram of an exposure box under glass exposed to natural light (see Figure 1);

d) Change "equipment exposed to artificial sunlight (for method B)" to "equipment exposed to artificial light (for method B)", change Technical content (see 5.9, 4.8 of the 2008 edition).

This document is modified to adopt ISO 787-15:2019 "Pigments and extenders - General test methods - Part 15: Coloring pigments of the same type" Comparison of Lightfastness.

Compared with ISO 787-15:2019, this document has many structural adjustments. The structural number changes between the two documents are shown in the table below.

See Appendix A.

This document has many technical differences compared to ISO 787-15:2019.

A list of these technical differences and their reasons is given in Appendix B.

The following editorial changes have also been made to this document.

--- In order to coordinate with the existing standard document, the document name is changed to "General test methods for pigments and extenders Part 9: Same type Comparison of lightfastness of coloring pigments";

--- Added Appendix A (informative) "Structural changes of this document compared with ISO 787-15:2019";

--- Added Appendix B (informative) "Technical differences between this document and ISO 787-15:2019 and their causes";

--- Added Appendix C (informative) "Reference Materials for Dispersion Preparation".

Introduction

GB/T 5211 is a series of standards for general test methods for pigments and extenders. Due to historical reasons, some of the standards developed in the early period were named the unified guide element "General test methods for pigments and extenders" is not used. In addition, there are a few general test methods for pigments and extenders.

Independent standard numbers are not included in the various parts of GB/T 5211.In recent years and in the future, the formulation or revision work will be gradually straightened out and standardized.

The writing format of standard number and standard name will improve the standard system. GB/T 5211 "General test methods for pigments and extenders" is to be formulated the correspondence between the various parts to be updated or revised and the current standards is shown in Table 1.

Table 1 Correspondence between the various parts of GB/T 5211 to be developed or revised and the current standards

Published document number Published document name Proposed or revised document number Proposed or revised document name GB/T 5211.1-2003 Determination of water-soluble pigments by cold extraction Method GB/T 5211.1 General test methods for pigments and extenders Part 1: Determination of water-soluble matter - Cold extraction method GB/T 5211.2-2003 Determination of water-soluble pigments by hot extraction Method GB/T 5211.2 General test methods for pigments and extenders Part 2: Determination of water-soluble matter - Hot extraction method GB/T 5211.3-2020 General tests for pigments and extenders Method Part 3.105°C Determination of hair-raising substances GB/T 5211.3 General test methods for pigments and extenders Part 3: Determination of volatile matter at 105°C GB/T 5211.4-1985 Pigment packing volume and apparent density Determination of GB/T 5211.4 General test methods for pigments and extenders Part 4: Determination of fill volume and apparent density GB/T 5211.5-2008 Determination of pigment resistance GB/T 5211.5 General test methods for pigments and extenders Part 5: Determination of resistance GB/T 5211.6-2020 General tests for pigments and extenders Method Part 6: Water Suspension Determination of liquid pH GB/T 5211.6 General test methods for pigments and extenders Part 6: Determination of pH value of aqueous suspensions GB/T 1864-2012 General tests for pigments and extenders Method Pigment Color Comparison GB/T 5211.7 General test methods for pigments and extenders Part 7: Color Comparison GB/T 1713-2008 Determination of pigment density by specific gravity Bottle Method GB/T 5211.8 General test methods for pigments and extenders Part 8: Determination of density - Pycnometer method GB/T 1710-2008 Comparison of lightfastness of similar coloring pigments GB/T 5211.9 General test methods for pigments and extenders Part 9: Lightfastness of coloring pigments of the same type Compare GB/T 1711-1989 Pigments are heat stable in drying paints Qualitative comparison GB/T 5211.10 General test methods for pigments and extenders Part 10: Heat stability of pigments in baking paints Qualitative comparison GB/T 5211.11-2008 Pigment water-soluble sulfate, chloride and nitrate determination GB/T 5211.11 General test methods for pigments and extenders Part 11: Water-soluble sulfates, chlorides and nitric acids Determination of salt

Table 1 Correspondence between the various parts of GB/T 5211 to be developed or revised and the existing standards (continued)

Published document number Published document name Proposed or revised document number Proposed or revised document name GB/T 5211.12-2007 Resistivity of pigment water extract Determination GB/T 5211.12 General test methods for pigments and extenders Part 12: Determination of resistivity of water extract GB/T 5211.13-1986 pH of pigment water extract Determination GB/T 5211.13 General test methods for pigments and extenders Part 13: Determination of pH of aqueous extracts GB/T 5211.14-2021 General tests for pigments and extenders Method Part 14: Screening residue Determination of mechanical flushing method GB/T 5211.14 General test methods for pigments and extenders Part 14: Determination of sieve residue by mechanical impact Washing method GB/T 5211.15-2014 General tests for pigments and extenders Method Part 15: Oil absorption Determination of GB/T 5211.15 General test methods for pigments and extenders Part 15: Determination of oil absorption GB/T 5211.16-2007 Comparison of the tinting power of white pigments GB/T 5211.16 General test methods for pigments and extenders Part 16: Comparison of the tinting power of white pigments GB/T 5211.17-1988 White pigment contrast ratio (hiding power) Comparison GB/T 5211.17 General test methods for pigments and extenders Part 17: White pigment contrast ratio (hiding power) Comparison GB/T 5211.18-2015 General tests for pigments and extenders Method Part 18: Screening residue Determination of water method (manual operation) GB/T 5211.18 General test methods for pigments and extenders Part 18: Determination of sieve residue Water method (manual operate) GB/T 5211.19-1988 Relative tinting strength of coloring pigments and Determination of diluted color - Visual ratio Comparison GB/T 5211.19 General test methods for pigments and extenders Part 19: Relative tinting strength and Determination of diluted color - Visual comparison method GB/T 5211.20-1999 in the natural color system, white, black and Comparative colors of coloring pigments Method GB/T 5211.20 General test methods for pigments and extenders Part 20: White, black and Comparative colorimetry of color pigments HG/T 3834-2006 Comparison of Anti-Bleeding Properties of Pigments GB/T 5211.21 General test methods for pigments and extenders Part 21: Comparison of pigment resistance to bleeding HG/T 3835-2006 Determination of pigment density (by centrifugation Machine to remove entrained air) GB/T 5211.22 General test methods for pigments and extenders Part 22: Determination of density (by centrifuge Entrained air) GB/T 13451.2-1992 Relative tinting strength and whiteness of coloring pigments Measurement of relative scattering power of color pigments Photometric method GB/T 5211.23 General test methods for pigments and extenders Part 23: Relative tinting strength and whiteness of coloring pigments Determination of relative scattering power of color pigments Photometric Method - - GB/T 5211.24 General test methods for pigments and extenders Part 24: Total content of polychlorinated biphenyls (PCBs) Determination of dissolution, cleanup and GC-MS the terms "lightfastness" and "lightfastness (or colorfastness)" refer to the resistance of a material to changes in its appearance when exposed to light.

The size of the light (if any) is affected by the amount and quality of light that strikes the material, as well as the nature and composition of the material itself.

Two mixtures with the same components but different proportions have different light resistance; two mixtures with the same proportions but similar components but not the same One component, light resistance is also different.

When exposed to natural light, the environment is affected by many variables (e.g., intensity and spectral distribution of natural light, temperature, relative humidity, and atmospheric the test conditions will vary, so the test results will not be comparable to those of similar tests conducted in other settings.

Therefore, it is not advisable to simply express the result as a function of time.

The considerations described above form the basis for comparing the lightfastness of two different samples of a coloring pigment.

to components which are otherwise identical, and the two mixtures are subjected (in a suitable manner) to the same quantity and nature of light.

After exposure to the same exposure line, the mixtures were placed side by side at the same time to meet these exposure conditions.

It is necessary to expose to the same light source for the same period of time.

Furthermore, the lightfastness of pigments is affected by the presence of other pigments such as titanium dioxide. This document takes this important aspect into account and therefore this is done using only the agreed base (vehicle) to form a single pigment dispersion and following the documented test procedure.

It is important to determine how far to allow exposure changes before comparing lightfastness.

It is not practical to assess exposure when the lightfastness of the pigment is known (commercial when the amount of change in the grey scale (for a specific reference pigment) is consistent with levels 4 and 3 of the GB/T 250 grey scale, a comparison of the changes in appearance is made.

General test methods for pigments and extenders Part 9: Comparison of lightfastness of coloring pigments of the same type

1 Scope

This document describes a general test method for comparing the lightfastness of colouring pigments of the same type (an agreed reference pigment and a test sample).

This document provides two exposure methods. Method A, pigment dispersion samples are exposed to natural light under glass; Method B, pigment dispersion samples are exposed to natural light under glass;

The panels are exposed directly to artificial light sources.

This document applies to coloring pigments.

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document.

For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to this document.

GB/T 250 Textiles—Tests for Colour Fastness—Grey Scale for Assessing Change in Colour (GB/T 250-2008, ISO 105-A02.1993, IDT) GB/T 3186 Paints, varnishes and raw materials for paints and varnishes - Sampling (GB/T 3186-2006, ISO 15528:2000, IDT) GB/T 11186 Coating color measurement method GB/T 16422.2-2022 Plastics - Test methods for exposure to laboratory light sources - Part 2: Xenon arc lamps (ISO 4892-2:2013, IDT) ISO 18451-1 Pigments, dyes and extenders — Terminology — Part 1: General terms extenders-Terminology-Part 1: Generalterms)

3 Terms and Definitions

For the purposes of this document, the terms and definitions given in ISO 18451-1 apply.

ISO and IEC maintain terminology databases used for standardization work at the following addresses.

4 Principles

The test sample and the agreed reference pigment are dispersed in the same agreed base (medium) to prepare dispersions.

Apply to the substrate and let it dry, then expose it to natural light (Method A) or artificial light (Method B) under specified conditions with rain protection measures.

Lightfastness is assessed by comparing the color change of the test specimen with that of an agreed reference pigment.

5 Instruments and Materials