1.1 本试验方法包括巯基苯并噻唑（MBT）亚磺酰胺含量测定。它基于用硫化氢气体（H）还原亚磺酰胺时释放的碱性胺的滴定 2. S） 2. ， 3. 或2-巯基苯并噻唑。 1.2 任何游离胺（HNR 2. )或相应胺的弱酸盐（HX·HNR 2. )在还原前进行滴定。该滴定度用于计算样品中碱性杂质（以游离胺计）的百分比。 1.3 通过所示的修改，该测试方法适用于所有MBT亚磺酰胺，即， N -环己基-2-苯并噻唑磺酰胺（CBS）， N、 N -二异丙基-2-苯并噻嗪亚磺酰胺（DIBS）、2（吗啉硫基）苯并噻唑（MBS）， N、 N -二环己基-2-苯并噻嗪亚磺酰胺（DCBS）， N-叔- 丁基苯并噻唑亚磺酰胺（TBBS）和4-吗啉基-2-苯并噻嗪二硫化物（MBSS）。 1.4 以国际单位制表示的数值应视为标准。 括号中给出的值仅供参考。 1.5 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 有关具体危险说明，请参阅第节 9 。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ===意义和用途====== 5.1 本试验方法旨在评估2-巯基苯并噻唑亚磺酰胺促进剂的纯度。这些产品与硫一起用于橡胶的硫化。 5.2 该测试方法适用于评估产品规格，因为它测量的性能与产品性能有关。由于它是比较不同生产设施的产品质量的主要特性，因此需要良好的实验室间精度和精密度。 5.3 根据过去的经验，该测试方法中的两个主要误差来源是:( 1. )不完全还原和( 2. )滴定终点评估。这些领域的问题可以通过严格遵循程序来避免。

1.1 This test method covers the determination of assay on mercaptobenzothiazole (MBT) sulfenamides. It is based on a titration of the basic amines liberated upon reduction of the sulfenamides with hydrogen sulfide gas (H 2 S) 2 , 3 or 2-mercaptobenzothiazole. 1.2 Any free amine (HNR 2 ) or weak acid salts of the corresponding amine (HX·HNR 2 ) are titrated prior to reduction. This titer is used to calculate percent basic impurity (as free amine) in the sample. 1.3 With the indicated modifications, this test method is applicable to all MBT sulfenamides, that is, N -cyclohexyl-2-benzothiazolesulfenamide (CBS), N,N -diisopropyl-2-benzothiazyl sulfenamide (DIBS), 2 (morpholinothio) benzothiazole (MBS), N,N -dicylohexyl-2-benzothiazyl sulfenamide (DCBS), N-tert- butyl-benzothiazole-sulfenamide (TBBS), and 4-morpholinyl-2-benzothiazyl disulfide (MBSS). 1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements, see Section 9 . 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 This test method is designed to assess the purity of 2-mercaptobenzothiazole sulfenamide accelerators. These products are used in combination with sulfur for the vulcanization of rubber. 5.2 The test method is suitable for assessing product specifications in that the property it measures is related to product performance. Since it is the primary property for comparison of product quality at different production facilities, good interlaboratory accuracy and precision is required. 5.3 Based on past experience, two significant sources of error in this test method are: ( 1 ) incomplete reduction and ( 2 ) titration end point assessment. Problems in these areas can be avoided by closely following the procedure.