Hivatkozási szám

MSZ EN ISO 1628-2:2020

Dokumentumazonosító

175944

Cím

Műanyagok. Hígított polimeroldatok viszkozitásának meghatározása kapilláris viszkoziméterrel. 2. rész: Poli(vinil-klorid) gyanták (ISO 1628-2:2020)

Angol cím

Plastics. Determination of the viscosity of polymers in dilute solution using capillary viscometers. Part 2: Poly(vinyl chloride) resins (ISO 1628-2:2020)

Alkalmazási terület

1.1 This document specifies conditions for the determination of the reduced viscosity (also known as viscosity number) and K-value of PVC resins. It is applicable to resins in powder form which consist of homopolymers of the monomer vinyl chloride and copolymers, terpolymers, etc., of vinyl chloride with one or more other monomers, but where vinyl chloride is the main constituent. The resins may contain small amounts of unpolymerized substances (e.g. emulsifying or suspending agents, catalyst residues, etc.) and other substances added during the course of the polymerization. This document is not applicable, however, to resins having a volatile-matter content in excess of 0,5 % ± 0,1 %, when determined in accordance with ISO 1269. In addition to this, it is not applicable to resins which are not entirely soluble in cyclohexanone. 1.2 The reduced viscosity and K-value of a particular resin are related to its molecular mass, but the relationship varies depending on the concentration and type(s) of other monomer(s) present. Hence, homopolymers and copolymers having the same reduced viscosity or K-value might not have the same molecular mass. 1.3 The values determined for reduced viscosity and K-value, for a particular sample of PVC resin, are influenced differently by the concentration of the solution chosen for the determination. Hence the use of the procedures described in this document only gives values for reduced viscosity and K-value that are comparable when the concentrations of the solutions used are identical. 1.4 Limiting viscosity number is not used for PVC resins. 1.5 The experimental procedures described in this document can also be used to characterize the polymeric fraction obtained during the chemical analysis of a PVC composition. However, the values calculated for the reduced viscosity and K-value in these circumstances might not indicate the actual values for the resin used to produce the composition because of the impure nature of the recovered polymer fraction.

ICS

83.080.20 Hőre lágyuló anyagok

Műszaki Bizottság

A szabvány nyelve

angol

Az érvényesség kezdete

2020-11-01

Forrás

idt ISO 1628-2:2020; idt EN ISO 1628-2:2020

Előd

MSZ EN ISO 1628-2:1999

Utód

Módosítás

SZK-közlemények

Kapcsolódó európai jogszabály

A szabvány

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