GB/T 21868.3-2008Pigments and extenders -- Methods of dispersion for assessment of dispersion characteristics -- Part 3: Dispersion using a high-speed impeller mill (English PDF)

Foreword

This section identical with the international standard ISO 8780-3:1990 "Pigments and extenders --- dispersion for assessment of dispersion method used in the first ---Part 3. dispersion using a high speed mixer "(in English).

This section is one of the GB/T 21868 "dispersion method of pigments and extenders assessment of dispersion characteristics with" national standards, listed below A series of national standards with international standards and the structure corresponding to.

--- Part 1. General (ISO 8780-1:1990);

--- Part 2. oscillation mill dispersion (ISO 8780-2:1990);

--- Part 3. dispersion using a high speed mixer (ISO 8780-3:1990);

--- Part 4. sand dispersion (ISO 8780-4:1990);

--- Part 5. automatic flat mill dispersion (ISO 8780-5:1990);

--- Part 6. ( 1990 ISO 8780-6) dispersed with a three-roll mill.

This section GB/T 21868 Part 3.

Are listed below in this section is closely related to the GB/T 21867 "Evaluation Method pigments and dispersion" series of national standard Prospective structure and corresponding international standards.

--- Part 1. Changes the tinting strength of colored pigments to be assessed (ISO 8781-1:1990);

--- Part 2. change the fineness of grind to be assessed (ISO 8781-2:1990);

--- Part 3. Evaluation of changes in the gloss (ISO 8781-3:1990).

This section of Appendix A normative appendix.

This part is proposed by the China Petroleum and Chemical Industry Association.

This part of the National Standardization Technical Committee and is under the jurisdiction of paints and pigments.

This section is drafted. in the construction of Changzhou coating Chemical Research Institute, Kunshan City Shiming Technology Development Co., Ltd.

1 Scope

This section provides a high-speed mixer dispersed pigments and methods.

This section should be combined with GB/T 21867 of the evaluation method using an agreed binder system. This section should GB/T 21868.1-2008 read together.

This method is limited to the grind with a suitable high viscosity, because only high binder content and/or high pigment concentrations in order to produce high Shear force. This does not mean there is provided a method of proportion to the preparation of the mill base (this process from laboratory equipment to the plant scaled A grinder is not a simple matter).

NOTE. High-speed mixer can be used either directly dispersed pigments can also be used for pre-dispersion, and then further dispersed to other devices, such as sand (bead milling) or Vertical Mill.

2 Normative references

The following documents contain provisions which, through reference GB/T 21868 in this section constitute provisions of this section. For dated reference documents Member, all subsequent amendments (not including errata content) or revisions do not apply to this section, however, encouraged to reach under this section Parties to research agreement to use the latest versions of these documents. For undated reference documents, the latest versions apply to this section.

GB/T 3186-2006 Paints, varnishes and raw materials for paints and varnishes - Sampling (ISO 15528:2000, IDT) GB/T 21868.1-2008 Pigments and extenders dispersion for assessment of dispersion method used in Part 1. General (ISO 8780-1:1990, IDT) GB/T 21867.1-2008 Evaluation Method of pigments and dispersion - Part 1. change the tinting strength of colored pigments of assessed (ISO 8781-1:1990, IDT) GB/T 21867.2-2008 Evaluation Method of pigments and dispersion - Part 2. Changes by the fineness of grind was Assessment (ISO 8781-2:1990, IDT) GB/T 21867.3-2008 Evaluation Method of pigments and dispersion - Part 3. Evaluation of changes in the gloss (ISO 8781-3:1990, IDT)

3 Requires supplementary information

Test methods specified in this part needs to be improved with additional information. Contents of additional information are listed in Appendix A.

4 Equipment

Normal laboratory equipment and glassware, as well as the following instruments.

4.1 high-speed mixer, a disc driven by the engine is a horizontal cylindrical vessel and a stirring blade, and are generally used Toothed edge of the disc.