предговор
ИСО (Међународна организација за стандардизацију) је глобална федерација националних тела за стандардизацију (Тела чланица ИСО). Развој међународних стандарда се обично спроводи преко ИСО техничких комитета. Each member group interested in a subject on which a technical committee has been established has the right to be represented on the Committee. International, governmental and non-governmental organizations in liaison with ISO are also involved in this work. ИСО блиско сарађује са Међународном електротехничком комисијом (ИЕЦ) о свим питањима електричне стандардизације.

Парт 1 of the ISO/IEC Directive describes the procedures used to develop this document and for further maintenance. Нарочито, обратите пажњу на различите стандарде одобрења који су потребни за различите типове ИСО докумената. This document has been drafted in accordance with the editorial rules in Part 2 ИСО/ИЕЦ директиве (види исо.орг/дирецтивес).

Имајте на уму да неки елементи овог документа могу бити предмет патентних права. ИСО није одговоран за идентификацију било ког или свих таквих патената. Details of any patent rights identified during the documentation development process will be included in the introduction and/or list of ISO patent claims received (see iso.org/patents).

Any trade names used in this document are information provided for the convenience of the user and do not constitute an endorsement.

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 (ТБТ), see the following URL: Foreword – Supplementary Information

The committee responsible for this document is ISO/TC 256, Pigments, Dyes and increments.

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

— Парт 1: Nanometer calcium carbonate for sealant applications

— Парт 2: Nanoscale titanium dioxide for sunscreen applications

ИСО 18473-1-2015 Functional pigments and fillers for special purposes – Парт 1: nano-sized calcium carbonate for sealant applications

увести
Sealants are widely used to prevent air, gas or liquid infiltration into many industries, including 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, пХ вредност, 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. Први, 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. Друго, nanomaterials are relatively new. Material properties may depend on the technique used to measure them. So,

Овај део ИСО-а 18473 lists the properties, measurements and characteristics of nanoscale calcium carbonate and is intended to aid its acceptance and application in sealants.

1 Обим примене
Овај део ИСО-а 18473 specifies the requirements and corresponding test methods for powdered nano-sized calcium carbonate for surface treatments used in sealant applications.

2 Normative reference files
All or part of the following documents are conventionally referenced in this document and are required for the application of this document. За датиране референце, citation-only versions apply. За цитате без датума, нову верзију наведеног документа (including any amendments) примењује.

ИСО 787-2, General test methods for pigments and increments-Part 2: Determination of volatiles at 105 °C

ИСО 787-5, General test methods for pigments and increments – Парт 5: Determination of oil absorption values

ИСО 787-9, General test methods for pigments and increments-Part 9: Determination of the pH value of aqueous suspensions

ИСО 3262-1, coating increments — Specification and test methods — Парт 1: Introduction and general test methods

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

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

ИСО 15528, Paints, varnishes and raw materials for paints and varnishes – Sampling

ИСО 18473-1-2015 Functional pigments and fillers for special purposes – Парт 1: nano-sized calcium carbonate for sealant applications

3 Terms and Definitions
For the purposes of this part of ISO 18473, the following terms and definitions apply.

3.1 Nanoscale

Sizes range from approximately 1 nm to 100 нм

Ентри Ноте 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.

Ентри Ноте 2: The lower limit in this definition (approximately 1 нм) 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 (на пример., calcite) or diamond-shaped biconical crystals (на пример., aragonite)

Јаван је само одељак са стандардним информацијама. Да бисте видели цео садржај, you will need to purchase the standard through the official channels.