プロピレングリコールのどのような特性をテストする必要があるか? そしてその検出方法
プロピレングリコールは、別名プロピレングリコールとも呼ばれる化学物質です。 1, 2-プロピレングリコールとか 1, 2-プロピレングリコール. 無色です, odorless, sweet organic compound with the formula C3H8O2. It is an important industrial raw material for the preparation of polyethers, polyurethanes, acrylics and acrylates, as well as for the preparation of coatings, 溶剤, fragrances, medicines and food.
The following are the main properties of propylene glycol to be tested and the corresponding detection indicators:
プロピレングリコールのどのような特性をテストする必要があるか? そしてその検出方法
| 財産 | Detection index |
|---|---|
| 外観 | The appearance is colorless transparent liquid |
| 純度 | Purity ≥99.5% |
| hydration | Moisture content ≤0.2% |
| acidity | Acidity (measured by HAc) ≤0.001% |
| Specific gravity | Specific gravity (20℃) 1.118-1.124 |
| 屈折率 | 屈折率 (20℃) 1.431-1.435 |
| Heavy metal | Lead ≤0.1ppm; Copper ≤0.1ppm; Zinc ≤0.1ppm; Cadmium ≤0.1ppm; Mercury ≤0.1ppm |
| Non-volatile residues | Non-volatile residue ≤0.001% |
| 酸化物 | Propylene glycol oxide content ≤0.05% |
検出方法
The following is a test method for the main properties of propylene glycol:
Appearance: Directly observe whether the appearance of the sample is a colorless transparent liquid.
純度: can be detected by gas chromatography, liquid chromatography, ultraviolet spectrophotometry and other methods.
水分: can be detected by Karl Fischer method, 比重法, drying method and other methods.
Acidity: It can be detected by acid-base titration, potentiometric titration, ultraviolet spectrophotometry and other methods.
Specific gravity: It can be measured using a hydrometer or hydrometer method.
プロピレングリコールのどのような特性をテストする必要があるか? そしてその検出方法
屈折率: Can be measured using a refractometer.
Heavy metals: 原子吸光分析, inductively coupled plasma mass spectrometry and other methods can be used for detection.
Non-volatile residues: can be detected by drying method, ash method and other methods.
酸化物: It can be detected by titration, spectrophotometry and other methods.
要するに, different detection methods are required for different performance indicators of propylene glycol, and the detection methods should ensure accuracy and reliability. In the actual production and use process, the quality of propylene glycol should be tested in accordance with the corresponding standards to ensure that it meets the relevant requirements.