TBEC initiator, chemically known as Tert-butyl (2-ethylhexyl) monoperoxy carbonate, is a commonly used organic peroxide and is widely used as an initiator in polymerization processes such as ethylene, styrene, acrylic acid, and methacrylic acid. It is used as a crosslinking agent in thermosetting resins such as EVA film for solar cells. Compared with tert butyl benzoate peroxide, TBEC initiators are more environmentally friendly and hygienic due to the fact that the decomposition products do not contain benzene rings.
Below is a brief introduction to the production process of TBEC initiator:
Step 1: Sodium salt synthesis
1) Mix hydrogen peroxide and tert butanol, and add 76% dilute sulfuric acid dropwise at a temperature of ≤ 30 ℃. After dripping, keep it warm for 4 hours, layer by layer, and use coarse tert as backup on the upper layer;
2) Prepare 10% diluted alkali with ionic membrane alkali and clean water;
3) Under stirring and freezing conditions, add crude tert dropwise, control the temperature inside the kettle to be less than 30 ℃, continue stirring for half an hour, then stop stirring, let it stand for 1 hour, and separate out sodium salt for backup; The upper layer of sodium tert can be sold as a finished product after alkaline washing.
Step 2: Synthesis of crude TBEC initiator
1) Add sodium salt directly to the reactor, stir and freeze;
2) When the temperature of the reaction kettle is ≤ 20 ℃, start adding chloroformic acid 2-ethylhexyl ester dropwise;
3) Control the droplet acceleration according to the temperature of the reaction kettle, and control the temperature inside the kettle to ≤ 30 ℃;
4) After dripping 2-ethylhexyl chloroformate, continue stirring for 2 hours, stop stirring, and let it stand for 1 hour before separating the lower mother liquor for wastewater treatment; The upper layer is the crude product of TBEC initiator.
Step 3: Washing and drying
1) Start stirring and freezing, control the temperature of the entire washing and drying process to ≤ 30 ℃ throughout the entire process;
2) Similarly, prepare a 10% dilute alkali solution, wash it in a 1:1 ratio to the crude TBEC initiator for 1 hour, let it stand for 30 minutes, and layer by layer. Separate the lower layer of washing alkali for three waste treatment;
3) Continue to leave the crude TBEC initiator in the reactor, wash it with a 5% baking soda solution of approximately 1/2 ratio for 1 hour, let it stand for 30 minutes, layer by layer, and separate the upper washing solution for three waste treatment;
4) The crude product of TBEC initiator is dried with about 20 kilograms of anhydrous magnesium sulfate, and then filtered to obtain the finished product of TBEC initiator.