GB 8829-1988 in English
SUPERSEDEDVulcanization accelerator NOBS (N-oxydiethylene-2-benzothiazyl sulfenamide)
- Issued on:1988-02-23
- Implemented on:1988-10-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$59.00
《GB 8829-1988硫化促进剂 NOBS （N-氧二乙撑-2-苯骈噻唑次磺酰胺）》由TC35（全国橡胶与橡胶制品标准化技术委员会）归口，TC35SC12（全国橡胶与橡胶制品标准化技术委员会化学助剂分会）执行，主管部门为中国石油和化学工业联合会。
Introduction
Standard Framework and Technology Evolution
NOBS is a representative product of sulfonamide delayed-acting accelerators. The formulation of its standard reflects the development level of rubber vulcanization technology in the 1980s. Compared with the early accelerator MBT, this standard introduces the photoelectric multifunctional melting point instrument as a key testing equipment for the first time, which improves the melting point control accuracy to ±0.5℃.
Core indicator specifications
| Indicator name | Superior product | Qualified product |
|---|---|---|
| Initial melting point(℃) | ≥80 | ≥78 |
| Heating loss(%) | ≤0.30 | ≤0.50 |
| Ash content(%) | ≤0.30 | ≤0.35 |
Testing instruments and experimental methods
The melting point is determined by the standardized process of Electrothermal Precision Melting Point Instrument, and the test consistency is ensured by the 10kPa pre-loaded sample pressure. The ash content test needs to be burned in a high temperature muffle furnace at 750±2℃ for 2h, and the deviation of parallel samples should be controlled within 0.04%.
Project Implementation Suggestions
Optimization Case of a Tire Factory in South China
After the factory implemented the standard GB8829-88, the NOBS batch qualification rate was increased from 85% to 96.5%. By standardizing the constant temperature drying oven at 50±2℃ for 3h, the scorching time of the rubber material can be extended to 26 minutes (original: 18 minutes)
Storage management specifications
| Condition parameters | Control requirements |
|---|---|
| Relative humidity | ≤65%RH |
| Turnover cycle | ＜180 days |
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