GB/T 46228-2025Brominated isobutene-isoprene rubber (BIIR) (English PDF)

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.

1 Scope

This document specifies the product grades, requirements, inspection rules, marking and accompanying documents, packaging, transportation and storage, and the corresponding test methods for BIIR technical indicators are described.

This document applies to isobutylene-isoprene copolymers prepared by low-temperature copolymerization using isobutylene and isoprene as the main raw materials and methyl chloride as the solvent. The butyl rubber is then brominated to obtain bromobutyl rubber.

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document.

For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to this document.

GB/T 1232.1 Unvulcanized rubber - Determination by disc shear viscometer - Part 1: Determination of Mooney viscosity

GB/T 4498.1-2025 Determination of rubber ash content Part 1: Muffle furnace method

GB/T 5577 Specification for synthetic rubber grades

GB/T 9869.3 Rubber vulcanizer for the determination of vulcanization characteristics Part 3: Rotorless vulcanizer

GB/T 15340 Sampling and sample preparation methods for natural and synthetic raw rubber

GB/T 19187 Sampling and Inspection Procedure for Synthetic Raw Rubber

GB/T 19188 Storage Guide for Natural and Synthetic Rubber

GB/T 24131.1-2018 Raw rubber - Determination of volatile matter content - Part 1: Hot roller method and oven method

GB/T 24131.2 Determination of volatile matter content of raw rubber Part 2: Heating loss of an automatic analyzer with an infrared drying unit

GB/T 32676 Evaluation method for halogenated isobutylene-isoprene rubber (BIIR and CIIR)

SH/T 1839 Determination of bromine content in brominated isobutylene-isoprene rubber (BIIR) - X-ray fluorescence spectrometry

3 Terms and Definitions

There are no terms or definitions that require definition in this document.

4 Product brand

According to the product brands specified in GB/T 5577, the BIIR product brands listed in this document are BIIR1932, BIIR1946, BIIR2032, BIIR2046, BIIR2132. The brand name contains two character groups, character group 1 is BIIR, which stands for brominated isobutylene-isoprene rubber;

Character group 2 represents the characteristic properties of rubber, see Figure 1 for an example.