Preparation of Glyceryl Tristearate
S1: Take tristearin, stir while feeding, keep the temperature at 100°C, add catalyst A, antioxidant and water after the tristearin is completely melted, at a temperature of 135°C and a pressure of 0.7MPa Carry out hydrolysis reaction under the condition of condition, hydrolyzate stands still 45min, oil and water are separated, and oil phase pressure filtration reclaims catalyst and promptly obtains stearic acid;
Wherein, in terms of mass ratio, in catalyst A, zinc oxide: Al2O3-MgO is 1: 6, and its consumption is 4% of the quality of glyceryl tristearate, and Al2O3-MgO is prepared by precipitation method, and in molar ratio, Al2O3:MgO is 2.5:1;
In terms of mass ratio, in antioxidants, antioxidant 1076: antioxidant DLTDP: antioxidant T501 is 0.12: 0.38: 1, and its consumption is 0.5% of tristearin quality;
By mass ratio, glyceryl tristearate: water is 1: 0.45;
S2: Add the stearic acid in S1 into the zinc stearate reaction kettle, keep the temperature at 110°C, add zinc oxide with 9% mass of tristearin while stirring, after feeding, the temperature of the material rises to 120°C , add catalyst B with 3% glyceryl tristearate mass, and stir for 30 minutes;
Wherein, catalyst B is the mixture of hydrogen peroxide and zinc peroxide, by mass ratio, hydrogen peroxide: zinc peroxide is 4: 1;
S3: Add zinc oxide with 3.8% tristearin mass and catalyst B with 2% tristearin mass, react at a temperature of 130°C, stop stirring, and the foam of the material drops to the equilibrium point , add catalyst B with 0.5% tristearin mass, and react at a temperature of 150° C. for 20 minutes;
S4: Add sodium hydroxide of 0.25% by mass of glyceryl tristearate while stirring, and react at constant temperature for 30 minutes;
S5: Turn on the vacuum pump, adjust the vacuum degree to -0.08MPa, dehydrate, and react stably for 60 minutes under constant temperature and constant pressure conditions, the reaction is terminated, sampling and testing, spraying powder after passing the test, packaging and storage, to obtain zinc stearate, the yield is 94.87%.
Antistatic agent and its preparation
Formula: 30kg of glyceryl tristearate, 10kg of pentaerythritol monostearate.
Preparation method: put pentaerythritol stearate and glyceryl tristearate into the reaction kettle, fill with nitrogen to control the negative pressure at 0.01MPa, raise the temperature to 120°C, react with stirring for 30min, then cool down to 110°C to obtain anti- Static agent.