Production method
(1) The saponification reaction put 3 parts of 30% sodium hydroxide into the dosing tank, heated to 90℃ by direct steam, and diluted to 1074kg/m3(10° Be). Add 5 parts stearic acid and 100 parts hot water to the enamel stir, stir to dissolve the stearic acid, and heat to 90 ° C. Slowly add the prepared hot alkali to the stearic acid aqueous solution under stirring. Keep at 90℃ until the saponification reaction is complete to produce sodium stearate soap liquid. C17H35COOH+NaOH C17H35COONa+H2O
(2) Double decomposition reaction The temperature of the saponification solution was still maintained at 90℃, and an aqueous solution of 1074kg/m3(10° Be) was prepared with 3 parts of lead acetate while stirring, and the double decomposition reaction was carried out to produce lead stearate and lead acetate. The resulting lead stearate is precipitated. After the complex decomposition reaction is completed, the supernatant is absorbed by static settlement. 2C17H35COONa+Pb(CH3COO)
2 Pb(C17H35COO)2+2CH3COONa
(3) Conversion: Add 6 parts of 30% sodium hydroxide into the precipitation of lead stearate, the complex decomposition product of the separation and removal solution, stir and heat, maintain 80 ~ 90℃, and carry out the conversion reaction to produce dibasic lead stearate and sodium stearate. After the conversion is completed, the finished product is obtained by filtration, washing, drying and crushing below 100℃. 3Pb(C17H35COO)2+4NaOH 4C17H35COONa+ This product +2H2O
use
This product is used as a heat stabilizer for polyvinyl chloride, and has excellent lubrication effect. Excellent electrical insulation, light stability and water resistance. This product does not melt at the processing temperature, showing the characteristics of solid lubricants. When used with lead salt stabilizers such as lead sulfate tribasic and lead phosphate disalt, the processing fluidity can be improved without frost spraying. This product is used in PVC hard products and soft products, widely used in record manufacturing. General electrical insulation material dosage 0.5 ~ 1. The combination of this product with cadmium salt can improve its vulcanization pollution and initial flammability.
China
