混合溶剂可测羟基含量吗

shizhenghe2008@ · 发表于 2013-9-27 15:40:14

市面的溶剂确实是乱作一糟，偶老板找来一溶剂，较便宜，含水0.2%，但怕oH含量高，兑稀合成树脂，不敢用，想测又找不到正确的方法，没有说明书，实验室兑稀制漆完全没问题，蒸留脱水很难，请教合成树脂高手指点。如何测这类溶剂的OH.

engineerhxl · 发表于 2013-9-27 16:29:00

打色谱，把成分分析出来不就什么都解决了？

sonow · 发表于 2013-9-27 16:45:14

有标准方法的. 参考一下PU里的方法吧. 另外GC-MS 联用分辨每一个组分也是可行的方法

Standard Test Methods for Hydroxyl Groups Using Acetic Anhydride Acetylation (ASTM E222) - These test methods cover the determination of hydroxyl groups attached to primary and secondary carbon atoms in aliphatic and alicyclic compounds and phenols. There is no equivalent ISO standard.

Standard Test Method for Hydroxyl Groups Using Reaction with p-Toluenesulfonyl Isocyanate (TSI) and Potentiometric Titration with Tetrabutylammonium Hydroxide (ASTM E1899) - This test method covers the determination of hydroxyl groups attached to primary and secondary carbon atoms in aliphatic and cyclic compounds and phenols. It is not suitable for determination of hydroxyl groups attached to tertiary carbon atoms. This test method is applicable to polyacetals, temperature sensitive materials, high solids polymer polyols, and rigid polyols. There is no equivalent ISO standard.

Standard Test Methods for Polyurethane Raw Materials Determination of Primary Hydroxyl Content of Polyether Polyols (ASTM D4273) - Test Method A: Fluorine-19 Nuclear Magnetic Resonance Spectroscopy (fluorine-19 NMR), measures the primary hydroxyl content in ethylene oxide-propylene oxide polyethers used in flexible urethane foams. It is suitable for polyethers with hydroxyl numbers of 24 to 300 and primary hydroxyl percentages of 2 to 98. Test Method B: Carbon-13 Nuclear Magnetic Resonance Spectroscopy (carbon-13 NMR), measures the primary hydroxyl content of ethylene-oxide-propylene oxide polyethers used in preparing flexible foams. It is suitable for polyethers with hydroxyl numbers of 24 to 109 and primary hydroxyl contents of 10 to 90%. There is no equivalent ISO standard.

Standard Test Methods for Testing Polyurethane Raw Materials Determination of Hydroxyl Numbers of Polyols (ASTM D4274) - These test methods measure the hydroxyl groups in polyester and polyether polyols. They also apply to many other hydroxyl-containing substances. The equivalent ISO standard is ISO 14900.

Standard Practice for Polyurethane Raw Materials: Determining Hydroxyl Number of Polyols by Near Infrared (NIR) Spectroscopy (ASTM D6342) - This standard covers a practice for the determination of hydroxyl numbers of polyols using NIR spectroscopy. Definitions, terms, and calibration techniques are described. Procedures for selecting samples, and collecting and treating data for developing NIR calibrations are outlined. Criteria for building, evaluating, and validating the NIR calibration model are also described. Finally, the procedure for sample handling, data gathering and evaluation are described. The implementation of this standard requires that the NIR spectrometer has been installed in compliance with the manufacturer's specifications. There is no equivalent ISO standard.

Polyols for Use in the Production of Polyurethane—Determination of Hydroxyl Number (ISO 14900)

Polyols for Use in the Production of Polyurethanes—Determination of Hydroxyl Number by NIR Spectroscopy (ISO 15063) - Establishes guidelines for the determination of hydroxyl numbers of polyols using NIR (near infrared) spectroscopy. Definitions and calibration techniques are given. Procedures for selecting calibration materials and for collecting and treating data to develop NIR calibrations are outlined. Criteria for building, evaluating and validating the NIR calibration model are also described. Procedures for sample handling, data gathering and evaluation are included.