Azo dyes (Azo dyes, a class of organic compounds with aryl groups attached to the aryl group) are the most widely used synthetic dyes in textiles and garments for dyeing and printing a variety of natural and synthetic fibers. Also used for coloring paints, plastics, rubber, etc. Azo is a substance that forms the base color in the dye. If the azo structure is discarded, most of the dye base color will not be formed. Dye varieties with a small number of azo structures may produce the following twenty-four carcinogenic aromatic amine substances in chemical reaction decomposition, which are prohibited. These banned azo dyes account for about 5% of the total azo dye base.
Azo is one of the necessary inspection items for international environmental protection. There are three kinds of inspection methods: thin layer chromatography (TLC), gas chromatography and mass spectrometry (GC-MSD) and high performance liquid chromatography (HPLC). The standard stipulates that the product to be inspected must not contain 23 kinds of azo dye intermediates. If one of them is found to be unqualified, the limit is 30ppm.
According to the latest national standard: GB/T 17592-2011 "Determination of textile banned azo dyes", Tang Xiaoping, Beijing Entry-Exit Inspection and Quarantine Bureau, conducted a lecture on "Detection of banned azo dyes for textiles", with special emphasis on azo traces. Concentration considerations for substance testing.
Azo concentration Precautions | IKA Weapon | IKA concentration program RV10 auto control rotary evaporator |
Control vacuum and temperature | 1) Built-in vacuum controller, precise vacuum control, accuracy + 1 mbar , meeting the requirements of precise vacuum control. 2) HB10 heating pot temperature control accuracy + 1 ° C , can meet the requirements of precise temperature control. |
|
Concentrated to near dryness, not completely evaporated | With quantitative distillation function, it can avoid evaporation and dryness 100% , eliminate repeated tests and low recovery rate. | |
Low vacuum | The N920 is a three-stage diaphragm vacuum pump with no oil dry operation and an ultimate vacuum of up to 2 mbar to meet the requirements of low vacuum. |
Attached: Tang Xiaoping expert network video viewing link: http://?videoId=101646
About IKA ( )
IKA Group is the market leader in pre-laboratory, calorimetric analysis, mixed dispersion industrial technology. Magnetic stirrers, overhead stirrers, dispersion homogenizers, mixers, constant temperature shakers, grinders, rotary evaporators, Heating plates, constant temperature circulators, calorimeters, laboratory reactors and other related products constitute the product line of IKA laboratory analysis, while industrial technology mainly includes mixing equipment for scale production, dispersion emulsification equipment, kneading equipment, and Try to expand the production of the complete solution. The group is headquartered in Staufen, southern Germany, with subsidiaries in the United States, China, India, Malaysia, Japan, South Korea, Brazil and other countries.
Founded in 1910, IKA is now proud to review the history of the past 100 years.
Puyang Linshi Medical Supplies Co., Ltd. , https://www.linshimedical.com