ISO 3233-3:2015 塗料およびワニス—非揮発性物質の体積パーセントの決定—パート3：ISO 3251に従って決定された非揮発性物質含有量、コーティング材料の密度、およびコーティング材 | ページ 2

Foreword

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The committee responsible for this document is ISO/TC 35, Paints and varnishes, Subcommittee SC 9, General test methods for paints and varnishes.

This first edition of ISO 3233-3 cancels and replaces ISO 23811:2009, which has been technically revised and, in addition to the change in number, contains the following changes:

• symbols have been harmonized with those used in ISO 3233-1 and ISO 3233-2;
• determination of dry film thickness has been added;
• statement on the density of the solvents of waterborne systems has been added;
• informative annex (Annex D) for an overview on the existing methods for determination of non-volatile matter content and volume of non-volatile matter has been added;
• text has been editorially revised and Normative References has been updated.

ISO 3233 consists of the following parts, under the general title Paints and varnishes — Determination of percentage volume of non-volatile matter:

• Part 1: Method using a coated test panel to determine non-volatile matter and to determine dry film density by the Archimedes principle
• Part 2: Method using the determination of non-volatile-matter content in accordance with ISO 3251 and determination of dry film density on coated test panels by the Archimedes principle
• Part 3: Determination by calculation from the non-volatile-matter content determined in accordance with ISO 3251 , the density of the coating material and the density of the solvent in the coating material

Introduction

This method is used to determine the volume of the dry coating obtainable using a coating material by calculation of the percentage volume of non-volatile matter. The value obtained by this method might not be the same as that measured or calculated by adding together the masses and volumes of the raw materials in a formulation. The volume occupied by a combination of resin and solvent might be the same as, greater than, or less than the combined volume of the separate components, since contraction or expansion of resin and the solvent can occur. A second factor affecting the volume of a dry coating is the degree to which the spaces between pigment particles are filled with binder. A third factor is the use of volatile components in reactive systems that, by their reaction, change into non-volatile film-building materials, i.e. amines and reactive solvents in high-build two-component coating materials.

Above and close to the critical pigment volume concentration, the volume of a dry paint film is greater than the theoretical volume, due to an increase in unfilled voids between pigment particles. The porosity of the film means that this method is unsuitable.

Other methods for determination of the percentage volume of non-volatile matter are described in ISO 3233-1 and ISO 3233-2. The method described in this part of ISO 3233 is a quick method which needs only the results of the non-volatile matter and the density of the coating material and the density of the solvents for the calculation. The precision of the method depends mainly on the determination of the non-volatile matter content and the unknown densities. But the precision of the combination of measurements and calculation is better than the precision of pure calculation methods with no measurements. The simple practical method is often used in the automotive industry, especially for commercial vehicles.

The method described in this part of ISO 3233 differs from the methods described in ASTM D 2697 and ASTM D 5201-05, 5.5 and gives different results.

1 Scope

This part of ISO 3233 a simple practical method for calculating the non-volatile matter by volume, NV_V, of a coating material from the non-volatile-matter content, NV, the density of the coating material, and the density of the solvents. Using the non-volatile matter by volume results and the density obtained in accordance with this part of ISO 3233, it is possible to calculate the theoretical spreading rate of a coating material.

This part of ISO 3233 is not applicable to coating materials which exceed the critical pigment volume concentration (CPVC).

2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

Bibliography