Stearyltrimethyl ammonium chloride

Product Details

CasNo： 112-03-8

MF： C21H46N.Cl

Appearance： white to slightly yellow granular

Delivery Time： 15 days

Packing： 25kg/bag

Purity： 99%

1. Basic Information​

• Chemical Name: Stearyltrimethylammonium Chloride​

• Synonyms: Octadecyltrimethylammonium Chloride, 1831​

• CAS Number: 112 - 03 - 8​

• Molecular Formula: C₂₁H₄₆ClN​

• Molecular Weight: 348.06 g/mol​

2. Physical and Chemical Properties​

• Appearance: Present as white or slightly yellowish solid particles.​

• Solubility: Soluble in hot water and ethanol. It shows good solubility in polar solvents, which is beneficial for its application in various liquid - based formulations. When shaken in a suitable solvent system, it can generate a certain amount of foam.​

• Melting Point: Typically around 249 °C (at 101325 Pa). This relatively high melting point indicates its stable solid - state properties under normal ambient conditions.​

• Density: Approximately 0.91 g/cm³ at 20 °C.​

• pH Value: In a 0.05% aqueous solution at 20 °C, the pH ranges from 5.5 - 8.5, showing a near - neutral characteristic in a dilute solution environment.​

• Water Solubility: At 25 °C, it has a solubility of about 1.759 mg/l in water. Although it is not highly soluble in cold water, its solubility can be enhanced under certain conditions such as heating or in the presence of co - solvents.​

3. Product Specifications​

• Content: Common content grades include 30%, 70%, 90%, and 99%. Different content levels are available to meet diverse application requirements. For example, a higher - content product (such as 99%) is often preferred in applications where high - purity and strong performance are crucial, while a lower - content product (e.g., 30%) may be suitable for some less - demanding industrial applications or when cost - effectiveness is a major consideration.​

• Packaging: Usually packed in 50 - kg plastic drums or 200 - kg drums. However, customized packaging options are also available to meet specific customer needs, whether it's for small - scale laboratory use or large - scale industrial procurement.​

4. Product Performance​

• Softening and Antistatic Properties: It has excellent softening effects, especially in the textile and paper industries. When used in fabric softeners, it can make fabrics feel smoother and more comfortable. Its antistatic property is due to the positively charged quaternary ammonium group, which can neutralize the negative charges on the surface of materials, effectively reducing static electricity generation. This is highly useful in synthetic fiber processing, where static problems are common.​

• Emulsifying and Dispersing Abilities: Stearyltrimethylammonium chloride is an effective emulsifier. It can reduce the surface tension between two immiscible liquids, such as oil and water, enabling the formation of stable emulsions. This property makes it widely used in the production of asphalt emulsions, silicone oil emulsions, and emulsion - type waterproof coatings. In addition, it can also help disperse insoluble solids in a liquid medium, ensuring uniform distribution and stability of the system.​

• Bactericidal and Disinfecting Capabilities: It exhibits certain bactericidal and disinfecting effects. The positively charged head group can interact with the negatively charged cell membranes of microorganisms, disrupting their normal physiological functions and ultimately leading to cell death. This property makes it applicable in some antibacterial and disinfectant product formulations, such as in the treatment of certain medical instruments or in the disinfection of some industrial water systems.​

5. Application Fields​

• Cosmetics and Personal Care:​

• Hair Care Products: It is a key ingredient in hair conditioners. By adsorbing onto the hair surface, it can repair damaged hair cuticles, reduce hair tangling, and make hair more manageable and shiny. It is also used in hair dyes and other hair - styling products to improve the performance and stability of the formulations.​

• Skin Care Products: In some skin - care formulations, it can act as a skin conditioner, providing a smooth and soft feel. Its antibacterial property can also contribute to preventing the growth of some harmful bacteria on the skin, which is beneficial for maintaining skin health.​

• Industrial Applications:​

• Textile Industry: As a fabric softener and antistatic agent, it improves the quality and comfort of textiles. It can be added during the textile finishing process to enhance the hand - feel of fabrics and reduce static - related problems during handling and use.​

• Construction Industry: In the production of asphalt emulsions and emulsion - type waterproof coatings, it serves as an emulsifier. The stable emulsions formed can be easily applied and have better adhesion and waterproof performance on building surfaces.​

• Petroleum and Mining: It can be used in the oil - field as a component of drilling fluids. Its emulsifying and wetting properties can help improve the performance of drilling fluids, such as reducing friction and improving the carrying capacity of cuttings. In the mining industry, it may be used in some flotation processes to modify the surface properties of minerals.​

• Other Fields:​

• Biomedical Field: In some cases, it can be used in the separation and purification of proteins. Its ability to interact with biological macromolecules through electrostatic forces can help in the precipitation or separation of specific proteins.​

• Agriculture: It may be used in certain agricultural formulations, such as in some pesticide emulsions to improve the dispersion and stability of pesticides, enhancing their efficacy.​

6. Production Process​

• Synthesis Route: Generally, stearyl alcohol reacts with hydrogen chloride gas under the catalysis of zinc chloride to produce stearyl chloride. Then, stearyl chloride reacts with trimethylamine to obtain stearyltrimethylammonium chloride.​

• Reaction Equation for the First Step:​

C18​H37​OH+HClZnCl2​​C18​H37​Cl+H2​O

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• Reaction Equation for the Second Step:​

C18​H37​Cl+(CH3​)3​N→C21​H46​ClN

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• Process Optimization: The production process is carefully optimized to ensure high - quality product output. This includes strict control of reaction conditions such as temperature, pressure, and reaction time. For example, the reaction temperature for the formation of stearyl chloride is usually maintained within a certain range (around 100 - 120 °C) to ensure a high reaction rate and selectivity. After the reaction, the product undergoes a series of purification steps, such as distillation, filtration, and washing, to remove impurities and by - products, thereby obtaining a high - purity stearyltrimethylammonium chloride product.​

7. Storage and Handling​

• Storage Conditions: Store in a cool, dry, and well - ventilated place. Avoid direct sunlight and high - temperature environments to prevent product degradation. Keep away from sources of ignition and oxidizing substances. The recommended storage temperature is generally below 30 °C.​

• Handling Precautions: When handling, wear appropriate personal protective equipment, including gloves, safety glasses, and protective clothing. Avoid inhalation of dust and contact with skin and eyes. In case of contact with skin, immediately wash with plenty of water and soap. If it gets into the eyes, rinse thoroughly with water for at least 15 minutes and seek medical attention. In case of accidental ingestion, do not induce vomiting and seek medical advice immediately.​