T/GDTL 005-2018 Polyester resin limit of tin element and testing methods

Scope

Scope: This standard specifies the definition of Wuxi polyester resins, the requirements for the allowable limit of tin elements in Wuxi polyester resins, test methods, inspection rules, and other content. This standard applies to Wuxi polyester resins; Main technical content: 4. Limitation requirements: The limit of tin elements in Wuxi polyester resins shall be ≤10mg/kg. Note 1: It should be noted that organic tin compounds pose a significant risk to public health and the environment. Whether standards are set to limit their use or not, manufacturers of coatings and their raw materials should take measures to minimize the use of organic tin compounds. Note 2: Due to the high uncertainty of test results for organic tin compounds dissolved in polyester resins and other organic materials, this standard adopts the method of limiting the total tin content in Wuxi polyester resins to control their organic tin compound content. Note 3: If the tin element content in polyester resins exceeds the standard limit, it cannot be confirmed that it definitely does not meet the requirements of relevant regulations. Further testing is needed to analyze the form of tin elements. 5. Test methods and principles: Refer to GB/T 30903 and use inductively coupled plasma mass spectrometry to test the tin element content in polyester resins. After treatment, the solution of the sample is introduced into the atomization system by carrier gas (argon) for atomization, and then enters the plasma center zone as an aerosol in a high-temperature and inert atmosphere. It is desolventized, vaporized, and ionized to form positively charged ions, which are introduced into the mass spectrometer by the ion collection system. The mass spectrometer separates them according to their mass-to-charge ratio, and the ion signal is received by the electron multiplier and detected after amplification. Based on the intensity of the tin element mass spectrometry peak, its quantitative analysis is carr

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