1.1 Reagents and solutions
a. Anhydrous Ethanol: Analytically pure
b. Calcium Carbonate: Analytically pure
c. Fluorescent Yellow Ethanol solution: 1g/L
d. Silver Nitrate standard solution: c(AgNO3) = 0.1mol/L
1.2 Analysis Steps
Weigh 0.35g (accurate to 0.0002g) sample into 50mL Ethanol, add 25mL pure water, 0.1g Calcium Carbonate and 8 drops Fluorescent Yellow Ethanol solution. Titrate by 0.1mol/L AgNO3 standard solution. The solution turn to pink red, as the titration end point.
1.3 Result calculation
Calculate the Assay X of Hexadecyltrimethylammonium Chloride in sample according to following formula:
X％＝
V * c * 320
m * 10
In formula:
V: The consumed volume of Silver Nitrate standard solution in titration, mL;
c: Molar concentration of Silver Nitrate standard solution, mol/L;
m: Mass of measured sample, g;
320 - molar mass of Hexadecyltrimethyl ammonium Chloride
1.4 Allowable difference
The difference between the two parallel determination results should not exceed 0.5%, taking the arithmetic mean as the determination result.
Cetyl trimethyl ammonium chloride (CTAC), also known as Cetrimonium chloride, is a quaternary ammonium compound with a wide range of applications in various industries, including:
• Surfactant: Cetyl trimethyl ammonium chloride is primarily used as a cationic surfactant due to its ability to lower the surface tension of liquids. It is commonly found in personal care products such as shampoos, conditioners, and hair styling products, where it acts as a hair conditioner and antistatic agent.
• Biocidal agent: Cetyl trimethyl ammonium chloride has antimicrobial properties and is used as a disinfectant and preservative in various products, including household cleaners, industrial sanitizers, and agricultural formulations.
• Fabric softeners: Hexadecyltrimethylammonium chloride is used in fabric softeners to impart a soft, smooth feel to textiles. It helps reduce static electricity and enhances the softness and manageability of fabrics.
• Emulsifier: Cetrimonium chloride can function as an emulsifying agent, helping to mix and stabilize oil and water-based ingredients in formulations such as creams, lotions, and ointments.
• Industrial applications: CTAC is used in various industrial processes, including pulp and paper manufacturing, textile processing, and as a component of asphalt emulsions.
• Research and laboratory use: Cetyl trimethyl ammonium chloride is also utilized in scientific research and laboratory settings as a reagent for DNA extraction, cell lysis, and protein purification.
At present, silicone products are gradually becoming a very important industrial raw material, such as silicone oil, silicone rubber, silicone oil lotion and so on. Our quaternary ammonium salt is widely used in the production of silicone, especially in the production of silicone oil lotion. However, the variety of applications is relatively concentrated, with the most commonly used being Dodecyl dimethyl benzyl ammonium chloride and Dodecyl dimethyl benzyl ammonium bromide.
According to literature reports, the use of Cetyl trimethyl ammonium chloride, Cetyl trimethyl ammonium bromide, Octadecyl trimethyl ammonium chloride, and Octadecyl trimethyl ammonium bromide is also very widespread in many countries. Especially in the production of fabric finishing agents, cationic surfactants are used as emulsifiers to achieve the softness, anti-static properties, improve the texture, elasticity, smoothness, and waterproofing of fabrics, Sometimes Tetramethyl ammonium hydroxide is also used as a catalyst for the reaction. However, usually if cationic emulsifiers are used alone, the effect is not very good, resulting in oil bleaching and demulsification, and it is difficult to use them in the same bath with multiple raw materials. In order to make the lotion more stable and maintain the above characteristics, it is generally necessary to add some non-ionic surfactants (such as alkyl phenol polyoxyethylene ether) for compounding, so that the lotion obtained has the characteristics of cationic dairy industry and can ensure the stability of lotion.
