GB/T 21868.2-2008Pigments and extenders -- Methods of dispersion for assessment of dispersion characteristics -- Part 2: Dispersion using an oscillatory shaking machine (English PDF)

Foreword

This section identical with the international standard ISO 8780-2:1990 "Pigments and extenders --- dispersion for assessment of dispersion method used ---Part 2. The oscillation mill dispersion "(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 2.

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 the use of oscillating mill dispersion method of pigments and extenders.

This method is suitable for the preparation of several sample quality control dispersion for pigment.

This section should be combined with GB/T 21867 evaluation method according to an agreed low viscosity binder system. This section should Read in conjunction with GB/T 21868.1-2008.

This method is limited to low viscosity abrasive grinding, polishing the ball so as to enable free movement. It does not apply to other dispersion techniques correctly Given the best millbase formulation.

NOTE. The advantage of oscillation law can in the least loss of solvent in a closed system, for different batches of a small amount of the grind tested simultaneously.

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 1713-1989 pigment density Pycnometer method (neq ISO 787-10. 1981, Generalmethodsoftestfor pigmentsandextenders-Part 10. Determinationofdensity-Pyknometermethod) GB/T 3186-2006 Paints, varnishes and raw materials for paints and varnishes - Sampling (ISO 15528:2000, IDT) GB/T 6753.4-1998 Paints and varnishes - Determination of flow time by use of flow cups (eqv ISO 2431:1993) GB/T 21868.1-2008 Methods for dispersing pigments and extenders assessment of dispersion characteristics with 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 paint preparer, the preparer of the container is subjected to 680 times per minute, 690 times reciprocating oscillation movement distance of 16mm, oscillation Angle of ± 15 °.

4.2 frame, can put a few mounted abrasive container and fixed to the central axis of oscillation mill, the specific method.

--- Abrasives, each loaded container away from the center of the oscillation axis grinding center is 70mm;

GB/T 21868.2-2008/ISO 8780-2:1990