1-2-3-benzotriazole (BTA) is an organic compound. It is white to light pink needle crystal. 1-2-3-benzotriazole is soluble in alcohol, benzene, toluene, chloroform, dimethylformamide, and most organic solvents. However, it is slightly soluble in water, soluble in hot water, and easily soluble in alkaline aqueous solutions.
1-2-3-benzotriazole is used for surface purification of silver, copper, and zinc in electroplating, and has an anti-tarnishing effect. In addition, benzotriazole is a good ultraviolet light absorber and can be used as a development antifogging for black and white film and photographic paper.
The high content of active components and the small number of impurities are prerequisites for the solubility of BTA. The solvent includes ethanol, benzene, toluene, chloroform, and N N-dimethylformamide.
The solubility of water and oil determines that benzotriazole must have a high content of impurities and less water to achieve both water and oil. 1 2 3 benzotriazole is not only water-soluble but also oil soluble. The emulsifier is not required for the addition process. This can greatly reduce the side effects of the addition of benzotriazole.
BTA is obtained by reacting o-benzenetriamine with sodium nitrite. The o-benzenetriamine was dissolved in 50°C water, and then glacial acetic acid was added to cool to 5°C. The reaction was then stirred by the addition of sodium nitrite. The reactants gradually turned dark green. The temperature rose to 70-80°C and the solution turned orange. Leave at room temperature for 2 h. The crystals were cooled, filtered, washed with ice water and dried to dryness. The crude product was distilled under reduced pressure. The fraction of 201-204°C (2.0 kPa) was collected and recrystallized from benzene to obtain a product having a melting point of 96°C-97°C, and the yield was about 80%.
Benzotriazole (BTA) is used in combination with ammonium hydroxide and ethylenediaminetetraacetic acid. Silver, copper, and zinc can be selectively measured.
1 2 3 benzotriazole has an anti-corrosion effect on metal materials such as copper, aluminum, cast iron, nickel, and zinc. It can be combined with a variety of corrosion inhibitors to improve corrosion inhibition. The addition of epoxy resin adhesives prevents corrosion of copper and its alloys. It is also widely used in metal rust inhibitors such as copper, silver, zinc, aluminum, cast iron, water purifying agents, etc.
1 2 3 benzotriazole BTA is mainly used for water treatment, oil oxidation, metal oxidation and so on. Benzotriazole has a good corrosion inhibition effect on the copper and has the same anti-corrosion effect on other metal materials.
In addition, benzotriazole BTA is also preferred UV absorber. Adding benzotriazole to products such as plastics, rubber, and fuel can solve the degradation problem well. And can improve the light resistance of synthetic materials.
However, benzotriazole can cause burning and toxic gases in the event of an open flame, causing a variety of adverse symptoms. Therefore, in actual production, it is necessary to use its scope and use two necessary restrictions.