ISO 23508-2021 pdf free download – Solution-polymerized SBR — Evaluation methods of viscoelastic properties.
This document specifies the standard test formulation，mixing procedure and test methods forevaluation of viscoelastic properties in a compound based on solution-polymerized styrene-butadienerubber (S-SBR), including functionalized s-SBR[7].
2Normative references
The following documents are referred to in the text in such a way that some or all of their contentconstitutes requirements of this document. For dated references, only the edition cited applies. Forundated references, the latest edition of the referenced document(including any amendments) applies.ISO 289-1,Rubber,unvulcanized – Determinations using a shearing-disc viscometer – Part 1:Determination of Mooney viscosity
ISo 2393,Rubber test mixes —Preparation, mixing and vulcanization — Equipment and procedures
ISO4664-1, Rubber, vulcanized or thermoplastic —Determination of dynamic properties— Part 1: Generalguidance
ISO 6502-2,Rubber—Measurement of vulcanization characteristics using curemeters— Part 2:Oscillatingdisc curemeter
ISO 6502-3,Rubber — Measurement of vulcanization characteristics using curemeters —Part 3:Rotorlesscuremeter
ISO 23529,Rubber – General procedures for preparing and conditioning test pieces for physical testmethods
3Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4664-1 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:—ISO online browsing platform: available at https://www.org/obp
一IEC Electropedia: available at https://www.electropedia.org/
4 Test formulation
The standard test formulation given in Table 1 shall be used for the evaluation of any type of S-SBR.Formulation A is an oil-extended S-SBR formulation.Formulation B is a non oil-extended S-SBRformulation.
5 Procedure for sample preparation
5.1? General
Equipment and procedure for preparation, mixing and vulcanization shall be in accordance with ISO 2393. The following procedure is an example which has been found suitable for 600 cm 3 laboratory internal mixer.
At the beginning of each series of test mixes, a machine conditioning batch shall be mixed using the same formulation as the mixes under test.
5.2? First? stage
— Filling factor: 0,70.
— Rotational speed: 50 r/min.
— Starting temperature: 90 °C ± 3 °C.
— Friction: 1:1,14.
— Ram pressure: 0,5 MPa.
The first stage procedure is given in 5.2 a) to 5.2 f).
The temperature of the batch discharged on completion of mixing shall be between 155 °C and 165 °C.
If necessary, adjust starting temperature, rotation speed and/or filling factor to reach discharge temperature.
After discharging the batch，immediately check the temperature of the batch with a suitabletemperature measuring device. If the temperature as measured falls outside the range of 155 C to165°C, discard the batch.Pass the batch three times through a mill with a mill opening of 2,5 mm and aroll temperature of 50 C± 5°C.
Determine the mass of the batch. If the mass differs from the theoretical value by more than +0)5 % or-1,5 %, discard the batch and remix.
Leave the batch for at least 3 h and up to 24 h at room temperature, if possible, at standard temperatureand humidity as defined in ISO 23529.
5.3Second stage
—Filling factor: 0,69.
—Rotational speed: 50 r/min.
– Starting temperature: 90 °C(adjust so that the discharge temperature is 155 °C to 165°C).一Friction: 1:1,14.
— Ram pressure: 0,5 MPa.
The second stage procedure is given in 5.3 a) to 5.3 c).ISO 23508 pdf download.