First, formula
Vinyl acetate 710 kg
Water 636 kg
Vinyl alcohol & tracelog = pd_info_promo "target = _blank > of polyvinyl alcohol (PVA) 62.5 kilogram
Ammonium persulfate (used after dilution with 10 times water) 1.43 kg
Octyl phenol polyoxyethylene ether 8 kg
Sodium bicarbonate (after dilution with 10 times water) 2.2 kg
Dibutyl phthalate 80 kg
   Second, the production process
   Polyvinyl alcohol and water were added to the dissolution vessel, stirred for 10 minutes, and the temperature was raised to 90 °C. The solution was dissolved for 4 hours and dissolved into a 10% solution. The filtered PVA aqueous solution was filtered, put into a polymerization tank, added 100 kg of octyl phenol polyoxyethylene ether and a backgrounding monomer (approximately 1/7 of the total monomer amount), and a concentration of 10% persulfuric acid. 5.5 kg ammonium solution, close the feed hole, open the cooling water. Start warming, rise to about 65 °C in 30 minutes, when the sight glass drops, close the steam valve (about 30-40 minutes), the temperature rises to 75-78 °C , at this time back to normal, that began to add orders Body (added in 8-9 hours). While adding 50 g of ammonium persulfate per hour (10-fold dilution with water) the reaction temperature high or low, the flow rate can be appropriately controlled monomer addition and amount of the initiator, but not exceeding the total formulation. The addition of monomer reflux and reaction temperatures were recorded every 30 minutes, and the addition of monomer flow and initiator was recorded every hour.
   After adding monomer, observe the temperature of the reaction solution. If it is too high (above 85 °C), add 440 g of ammonium persulfate properly. When it is added, it should be added in several batches (the reaction is added too quickly once) and the liquid temperature rises to 90- At 95 °C , hold for 30 minutes, cool to below 50 °C and add sodium bicarbonate solution. After the appearance of the emulsion was observed to be acceptable, dibutyl phthalate was added and the mixture was stirred for 1 hour and discharged.