34. Please briefly describe the method for determining the ammonia value of aminosilicone oil.
Answer: The various properties that amino silicone oil gives to fabrics, such as feel, smoothness, fullness, etc., are all brought by the amino groups in the polymer. The amino content in silicone oil is often expressed by the ammonia value, which refers to the number of millimoles of 0.1 mol/L hydrochloric acid required to neutralize 1g of amino silicone oil. Therefore, the ammonia value is directly proportional to the mole percentage of amino groups in the silicone oil. The specific operation steps are: accurately prepare 0.1 mol/L hydrochloric acid standard solution A, and calibrate it with dry sodium carbonate (120°C, 10h) (accurate to 0.0001). Accurately weigh the sample (about 19, accurate to 0.0001g) into a 250mL Erlenmeyer flask, dissolve it with 30mL toluene (analytical grade) and 15mL isopropyl alcohol (analytical grade), and add 3 to 4 drops of bromophenol blue for indication. agent. Titrate with standard hydrochloric acid solution A. When the color of the solution changes from blue to light yellow (obvious sudden jump) as the end point, record the volume of hydrochloric acid solution V1 at this time and do a blank test. 
Where: m is the mass of the sample, g1V1 is the volume of hydrochloric acid standard solution A consumed by the sample, mL; V0 is the volume of hydrochloric acid standard solution A consumed by the blank sample, mL; C is the substance concentration of standard hydrochloric acid solution A, mol/L. If the concentration of the standard titration solution used is different from the regulations, appropriate corrections should be made. The result should be rounded to two decimal places.
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