Overview
ISO 2028:2015 is an international standard developed by the International Organization for Standardization (ISO) that specifies methods for isolating dry polymers from synthetic rubber latices containing anionic surfactants. The standard is essential for laboratories and manufacturers involved in rubber production and quality control. It focuses on isolating the polymer for subsequent testing, such as determining Mooney viscosity, bound styrene or acrylonitrile content in the polymer chain, and mill shrinkage.
This standard addresses the challenges posed by different latex formulations, especially those using various surfactants and stabilizers. It presents four isolation methods suitable for a broad range of synthetic rubber latices but advises verification of method applicability for specific latex types.
Key Topics
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Isolation Methods: ISO 2028:2015 outlines four distinct methods catering to different types of synthetic rubber latices including Styrene-Butadiene Rubber (SBR), Carboxylated SBR/X-NBR, Nitrile Butadiene Rubber (NBR), and concentrated latices with over 55% solids.
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Use of Antioxidants: Methods incorporate the addition of antioxidants like trinonyl phenyl phosphite (TNPP) to preserve polymer integrity during isolation.
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Coagulating Agents: The standard specifies various coagulants such as polyamine polyelectrolyte solutions, aluminium sulfate in dilute sulfuric acid, and ethanol for efficient coagulation of latex.
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Preparation and Drying: Following coagulation, the rubber crumb is washed and dried in a ventilated oven at 70 °C ± 5 °C to constant mass, ensuring sample consistency for subsequent testing.
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Applicability Considerations: The document emphasizes confirming method suitability, especially for latices with non-ionic stabilizers or high-tack polymers, which may resist coagulation.
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Safety and Compliance: Users are advised to follow standard laboratory safety practices and comply with relevant national regulations during sample preparation.
Applications
ISO 2028:2015 is indispensable for:
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Rubber Industry Laboratories: For standardized isolation of dry polymer from synthetic rubber latices, enabling reliable testing of polymer properties.
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Quality Control: Allowing manufacturers to perform consistent and comparative analyses such as viscosity testing and compositional assessments.
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Research and Development: Facilitating the evaluation of novel synthetic latices and stabilizers and their effects on polymer isolation and properties.
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Material Certification: Providing traceable and internationally recognized methods to certify synthetic rubber materials in compliance with industrial standards.
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Process Optimization: Assisting production engineers to refine latex coagulation and drying processes based on feedback from standardized testing procedures.
Related Standards
For comprehensive latex and rubber analysis, ISO 2028:2015 references and aligns with:
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ISO 123: Rubber latex - Sampling: Defines sampling procedures essential for preparing representative latex test samples.
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ISO 124: Latex, rubber - Determination of total solids content: Provides guidelines to determine the solids content, which influences the isolation procedure.
These related standards are critical for ensuring proper sampling and characterization prior to applying ISO 2028 methods.
Keywords: ISO 2028:2015, synthetic rubber latex, dry polymer preparation, latex coagulation, Mooney viscosity, anionic surfactants, polymer isolation, rubber testing standards, SBR latex, NBR latex, carboxylated latex, rubber quality control, synthetic latex processing.
