GB/T 25260.2-2018 in English
VALIDSynthetic rubber latex--Part 2: Carboxyl acrylonitrile--butadiene rubber latex(XNBRL)
- Issued on:2018-12-28
- Implemented on:2019-11-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$78.00
《GB/T 25260.2-2018合成胶乳 第2部分：羧基丁腈胶乳（XNBRL）》由TC35（全国橡胶与橡胶制品标准化技术委员会）归口，TC35SC6（全国橡胶与橡胶制品标准化技术委员会合成橡胶分会）执行，主管部门为中国石油和化学工业联合会。
Introduction
National Standard of the People's Republic of China GB/T 25260.2—2018
Synthetic Latex Part 2: Carboxylated Nitrile Butadiene Latex (XNBRL)
Standard Formulation Background and Technology Evolution Analysis
GB/T 25260 "Synthetic Latex" series of standards are important specifications for China's synthetic rubber industry, divided into three parts: carboxylated styrene butadiene latex, carboxylated nitrile butadiene latex and chloroprene latex. This part (Part 2) focuses on carboxylated nitrile butadiene latex (XNBRL), and specifies its technical requirements, test methods, inspection rules and storage conditions.
Comparison of standard frameworks
| Projects | Comparison of technical indicators | |||||
|---|---|---|---|---|---|---|
| Superior products | Qualified products | Medium combined acrylonitrile | Medium-high combined acrylonitrile | High combined acrylonitrile | ||
| Content of combined acrylonitrile (mass fraction)/% | >25.0～<30.0 | ≤0.01 | ≥42.0 | |||
| Total solid content (mass fraction)/% | <100 | |||||
Technical Requirements Interpretation
The technical indicators of carboxylated nitrile latex (XNBRL) include appearance, total solid content, viscosity, pH value, residual volatile organic matter content, etc. Among them, the content of acrylonitrile is one of the key performance indicators, which directly affects the performance and application field of latex.
Test method description
- Appearance: Determined by visual method, it is required to be a white emulsion without foreign matter and visible agglomerates.
- pH value: Determined in accordance with SH/T 1150-2011, ranging from 7.5 to 9.0.
- Residual volatile organic compound content: Determined according to SH/T 1760-2007, required to be ≤0.003% (superior product).
Implementation suggestions
To ensure that the quality of carboxylated nitrile latex meets the standard requirements, manufacturers should:
- Establish a strict quality control system to ensure the stability of raw materials and production processes.
- Perform regular inspections according to the test methods specified in the standards, and keep complete inspection records.
- Strengthen the management of packaging, transportation and storage to prevent product performance from being affected by the external environment.
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