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ISO (Organisasi Internasional untuk Standardisasi) adalah federasi global badan standar nasional (badan anggota ISO). Pengembangan standar internasional biasanya dilakukan melalui komite teknis ISO. Setiap kelompok anggota yang tertarik pada suatu topik yang telah dibentuk komite teknisnya berhak untuk diwakili dalam Komite. Internasional, organisasi pemerintah dan non-pemerintah yang bekerja sama dengan ISO juga terlibat dalam pekerjaan ini. ISO bekerja sama dengan Komisi Elektroteknik Internasional (IEC) tentang segala hal standardisasi kelistrikan.

Bagian 1 Petunjuk ISO/IEC menjelaskan prosedur yang digunakan untuk mengembangkan dokumen ini dan untuk pemeliharaan lebih lanjut. Secara khusus, perhatikan standar persetujuan berbeda yang diperlukan untuk berbagai jenis dokumen ISO. Dokumen ini telah disusun sesuai dengan aturan editorial di Bagian 2 dari Petunjuk ISO/IEC (lihat iso.org/directives).

Harap dicatat bahwa beberapa elemen dari dokumen ini mungkin memiliki hak paten. ISO tidak bertanggung jawab untuk mengidentifikasi salah satu atau semua paten tersebut. Rincian hak paten apa pun yang diidentifikasi selama proses pengembangan dokumentasi akan disertakan dalam pendahuluan dan/atau daftar klaim paten ISO yang diterima (lihat iso.org/patents).

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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 (TBT), see the following URL: Kata pengantar – Informasi tambahan

Komite yang bertanggung jawab atas dokumen ini adalah ISO/TC 256, Pigmen, Dyes and increments.

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

— Bagian 1: Nanometer calcium carbonate for sealant applications

— Bagian 2: Nanoscale titanium dioxide for sunscreen applications

ISO 18473-1-2015 Pigmen dan pengisi fungsional untuk tujuan khusus – Bagian 1: kalsium karbonat berukuran nano untuk aplikasi sealant

memperkenalkan
Sealants are widely used to prevent air, gas or liquid infiltration into many industries, termasuk konstruksi, 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. Sebagai akibat, 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, luas permukaan tertentu, mass fraction, morphology, nilai pH, magnesium content, nilai serapan minyak, 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. Pertama, 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. Kedua, nanomaterials are relatively new. Material properties may depend on the technique used to measure them. So,

Bagian dari ISO ini 18473 lists the properties, measurements and characteristics of nanoscale calcium carbonate and is intended to aid its acceptance and application in sealants.

1 Lingkup aplikasi
Bagian dari ISO ini 18473 specifies the requirements and corresponding test methods for powdered nano-sized calcium carbonate for surface treatments used in sealant applications.

2 File referensi normatif
All or part of the following documents are conventionally referenced in this document and are required for the application of this document. Untuk referensi bertanggal, versi hanya kutipan berlaku. Untuk kutipan tak bertanggal, versi baru dari dokumen referensi (termasuk amandemen apa pun) berlaku.

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

ISO 787-5, General test methods for pigments and increments – Bagian 5: Penentuan nilai serapan minyak

ISO 787-9, General test methods for pigments and increments-Part 9: Penentuan nilai pH suspensi berair

ISO 3262-1, coating increments — Spesifikasi dan metode pengujian — Bagian 1: Introduction and general test methods

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

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

ISO 15528, Cat, pernis dan bahan baku cat dan pernis – Contoh

ISO 18473-1-2015 Pigmen dan pengisi fungsional untuk tujuan khusus – Bagian 1: kalsium karbonat berukuran nano untuk aplikasi sealant

3 Istilah dan Definisi
For the purposes of this part of ISO 18473, istilah dan definisi berikut berlaku.

3.1 Nanoscale

Sizes range from approximately 1 nm to 100 nm

Catatan Masuk 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.

Catatan Masuk 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 (misalnya, calcite) or diamond-shaped biconical crystals (misalnya, aragonite)

Hanya bagian informasi standar yang bersifat publik. Untuk melihat konten selengkapnya, Anda perlu membeli standar melalui saluran resmi.