S1: get glyceryl tristearate, stir while feeding, the temperature is kept at 100 ℃, add catalyst A, antioxidant and water after all glyceryl tristearate is melted, at a temperature of 135 ℃, the pressure is 0.7MPa The hydrolysis reaction was carried out under the condition of 100 °C, the hydrolyzed product was allowed to stand for 45 min, the oil and water were separated, and the catalyst was recovered by oil-phase pressure filtration to obtain stearic acid;
Wherein, by mass ratio, in catalyst A, zinc oxide: Al2O3-MgO is 1:6, and its dosage is 4% of the mass of glyceryl tristearate, and Al2O3-MgO is prepared by precipitation method, in molar ratio, Al2O3:MgO is 2.5:1;
In terms of mass ratio, among the antioxidants, antioxidant 1076: antioxidant DLTDP: antioxidant T501 is 0.12:0.38:1, and the amount thereof is 0.5% of the mass of glyceryl tristearate;
By mass ratio, glyceryl tristearate: water is 1: 0.45;
S2: add the stearic acid in S1 to the zinc stearate reactor, the temperature is maintained at 110 ° C, add 9% zinc oxide of glyceryl tristearate quality while stirring, after the feeding is completed, the material temperature rises to 120 ° C , add the catalyst B of 3% by mass of glyceryl tristearate, and stir the reaction for 30min;
Wherein, catalyst B is a mixture of hydrogen peroxide and zinc peroxide, and in mass ratio, hydrogen peroxide: zinc peroxide is 4:1;
S3: add 3.8% of zinc oxide by mass of glyceryl tristearate and catalyst B of 2% by mass of glyceryl tristearate, react at a temperature of 130 ° C, stop stirring, and after the material foam is reduced to the equilibrium point , Catalyst B with 0.5% mass of glyceryl tristearate was added, and the reaction was carried out for 20 min at a temperature of 150 °C;
S4: add 0.25% sodium hydroxide of glyceryl tristearate mass while stirring, and react at constant temperature for 30min;
S5: turn on the vacuum pump, adjust the vacuum degree to -0.08MPa, dehydrate, stabilize the reaction for 60min under the condition of constant temperature and pressure, terminate the reaction, sample and test, spray powder after passing the test, pack and store, and obtain zinc stearate, and its yield is 94.87%.
A method for preparing massive Zinc Stearate Powder, a. 1400g of stearic acid is put into a reactor under normal pressure and heated to 130-160°C, then 70g of catalyst hydrogen peroxide and 220g of zinc oxide are added to react for 90 minutes to be in a molten state; b , adding antioxidant 5g and stirring for 5-20 minutes; c, adding the molten zinc stearate obtained in step b into the mold with polyethylene wire mesh skeleton; d, making the block of desired shape after cooling like Zinc Stearate Powder.
A method for producing zinc stearate, wherein the zinc stearate is prepared by reacting the following components in parts by weight: 800-1200 parts of stearic acid, 140-170 parts of zinc oxide, 5-15 parts of catalyst, 50-70 parts of deionized water;
The production method of Zinc Stearate Powder includes the following steps:
(1) Put 800-1200 parts of stearic acid and 140-170 parts of zinc oxide into the reaction kettle, heat up to 57-65 ℃, start stirring, after stirring for 8-15min, add 5-15 parts of catalyst and 50-70 parts of deionized water, cover the lid of the reaction kettle, and continue to heat up to react;
(2) Start the reaction when the temperature in the reactor rises to 75-80°C, stop heating when the temperature continues to rise to 93-98°C, keep the temperature stable, and react for 18-25min until the pressure in the reactor rises to 2-2.5kg·f/ cm2, open the exhaust valve of the reactor to exhaust;
(3) After the exhaust is completed, open the lid of the kettle. At this time, the reaction material changes from liquid to powdery solid, and the reaction is completed;
(4) The reacted material is discharged from the reactor, and the product is obtained through the crushing process.
The catalyst includes acetic acid, hydrogen peroxide, potassium hydroxide solution and ammonia water.
