préface
OIN (Organisation internationale de normalisation) est la fédération mondiale des organismes nationaux de normalisation (Comités membres de l'ISO). L'élaboration de normes internationales est généralement réalisée par l'intermédiaire de comités techniques ISO.. Chaque groupe membre intéressé par un sujet pour lequel un comité technique a été créé a le droit d'être représenté au sein du comité.. International, les organisations gouvernementales et non gouvernementales en liaison avec l'ISO sont également impliquées dans ces travaux. L'ISO travaille en étroite collaboration avec la Commission électrotechnique internationale (CEI) sur toutes les questions de normalisation électrique.

Partie 1 de la Directive ISO/CEI décrit les procédures utilisées pour élaborer ce document et pour sa maintenance ultérieure.. En particulier, prendre note des différentes normes d'approbation requises pour les différents types de documents ISO. This document has been drafted in accordance with the editorial rules in Part 2 de la directive ISO/CEI (voir iso.org/directives).

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For an explanation of ISO specific terms and expressions related to conformity assessment, as well as information on ISO compliance with WTO principles in Technical Barriers to Trade (OTC), see the following URL: Avant-propos – Information supplémentaire

Le comité responsable de ce document est l'ISO/TC 256, Pigments, Dyes and increments.

OIN 18473 consists of the following parts under the general heading Functional pigments and increments for special applications:

— Partie 1: Nanometer calcium carbonate for sealant applications

— Partie 2: Nanoscale titanium dioxide for sunscreen applications

OIN 18473-1-2015 Pigments fonctionnels et charges à usage spécial – Partie 1: carbonate de calcium de taille nanométrique pour les applications de mastic

introduire
Sealants are widely used to prevent air, gas or liquid infiltration into many industries, y compris la construction, automobiles and electronics. Increments are an important component of sealant formulations that reduce cost and improve rheological and mechanical properties. The content of increment agent varies widely and can be as high as 50% (mass fraction). A common additive in sealants is calcium carbonate (CaCO 3) because it is readily available in a variety of sizes and can be used as a rheological modifier, enhancer, and sunblock. Commercial calcium carbonate can be divided into heavy calcium carbonate (GCC) and precipitated calcium carbonate (PCC), with three crystal structures of calcite, aragonite and spheroid aragonite. It exists in various forms, such as cubic, spherical, spindle, fibrous and acicular. Calcium carbonate with calcite crystal structure and cubic or spherical form is most widely used in sealant applications.

Nanoscale calcium carbonate (NCC) provides improved performance and additional features for a variety of sealants, including thixotropy, flame retardant, and improved durability and recyclability, and has become a major ingredient in sealant formulations. Nanoscale calcium carbonate in powder form is now easy to manufacture, mainly through the precipitation route to control size and form. The importance of surface treatment for the use of NCC in sealants cannot be overstated. Natural calcium carbonate 3 is hydrophilic. As a result, it tends to clump in organic polymers and plasticizers. NCCS, in particular, tend to aggregate more easily due to their small size and large surface area. NCCS are surface treated to give them hydrophobicity and improve their dispersion in hydrophobic systems. The surface treatment also improves the compatibility of the polymer matrix, thus improving the interface adhesion between the increment agent and the polymer.

It was found that the particle size, specific surface area, mass fraction, morphology, PH, magnesium content, oil absorption value, water content and other characteristics of the supplied nano-sized calcium carbonate affected the performance of the sealant mixed with these materials. Nanoparticles. The characteristics of NCCS that need to be detailed in relation to sealant performance arise from the following facts. D'abord, agreements between customers and suppliers do not always cover all material characteristics that affect sealant performance and/or machinability, or they are interpreted differently by customers and suppliers. Deuxième, nanomaterials are relatively new. Material properties may depend on the technique used to measure them. So,

Cette partie de l'ISO 18473 lists the properties, measurements and characteristics of nanoscale calcium carbonate and is intended to aid its acceptance and application in sealants.

1 Champ d'application
Cette partie de l'ISO 18473 specifies the requirements and corresponding test methods for powdered nano-sized calcium carbonate for surface treatments used in sealant applications.

2 Dossiers normatifs de référence
All or part of the following documents are conventionally referenced in this document and are required for the application of this document. Pour les références datées, les versions avec citation uniquement s'appliquent. Pour les citations non datées, une nouvelle version du document référencé (y compris les éventuelles modifications) s'applique.

OIN 787-2, Méthodes générales d'essai pour les pigments et les incréments-Partie 2: Détermination des matières volatiles à 105 °C

OIN 787-5, Méthodes générales d'essai pour les pigments et les incréments – Partie 5: Determination of oil absorption values

OIN 787-9, Méthodes générales d'essai pour les pigments et les incréments-Partie 9: Détermination de la valeur du pH des suspensions aqueuses

OIN 3262-1, coating increments — Spécifications et méthodes de test — Partie 1: Introduction and general test methods

OIN 3262-6, paint increments-specification and test methods-Part 6: Precipitated calcium carbonate

– OIN 9277, Determination of specific surface area of solids by gas adsorption – BET method

OIN 15528, Des peintures, vernis et matières premières pour peintures et vernis – Échantillonnage

OIN 18473-1-2015 Pigments fonctionnels et charges à usage spécial – Partie 1: carbonate de calcium de taille nanométrique pour les applications de mastic

3 Termes et définitions
Pour les besoins de cette partie de l'ISO 18473, les termes et définitions suivants s'appliquent.

3.1 Nanoscale

Sizes range from approximately 1 nm to 100 nm

Note d'entrée 1: Attributes that are not extrapolated from a larger size are usually (but not limited to) displayed within this size range. For such attributes, the size limit is considered to be approximate.

Note d'entrée 2: The lower limit in this definition (approximately 1 nm) was introduced to avoid the designation of individual and small atomic groups as nanoobjects or nanostructured elements, which may imply that there is no lower limit.

3.2 Precipitate calcium carbonate

A synthetic calcium carbonate composed of triangular crystals (par exemple., calcite) or diamond-shaped biconical crystals (par exemple., aragonite)

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