Overview
Sodium stearate, often referred to as 'soft soap' in Chinese (软丁), is a sodium salt derived from stearic acid. It is a versatile chemical compound widely utilized in various industries due to its emulsifying, thickening, and stabilizing properties. Sodium stearate is commonly found in cosmetics, pharmaceuticals, and industrial applications, where it acts as a key ingredient in formulations requiring smooth texture and stability. The compound is produced through the saponification of stearic acid with sodium hydroxide. Its white, powdery or flaky appearance makes it easy to handle and incorporate into different products. Sodium stearate's compatibility with both water and alcohol enhances its utility in diverse formulations.
Physical and Chemical Properties
Sodium stearate exhibits distinct physical and chemical properties that make it suitable for various applications. It has a molecular weight of 306.46 g/mol and a density of approximately 1.02 g/cm³. The compound melts at temperatures between 245-255°C and is soluble in hot water and alcohol, though it remains insoluble in cold water. Chemically, sodium stearate acts as an anionic surfactant, reducing surface tension between liquids or between a liquid and a solid. This property is particularly valuable in emulsification processes, where it helps mix oil and water-based components. Its stability under moderate temperatures and resistance to oxidation further enhance its industrial relevance.
Main Applications
Sodium stearate finds extensive use across multiple industries. In cosmetics, it serves as an emulsifier and thickener in creams, lotions, and soaps, ensuring a smooth and stable texture. The pharmaceutical industry employs it as a binder and lubricant in tablet formulations, improving drug delivery and consistency. Industrial applications include its use as a mold release agent in plastics manufacturing and as a stabilizer in lubricants. Sodium stearate also plays a role in the production of rubber and latex products, where it acts as an emulsifying agent during polymerization. Its versatility and effectiveness make it a staple in many chemical formulations.
Safety and Storage
While sodium stearate is generally considered safe for use, proper handling and storage are essential to prevent potential hazards. The compound should be stored in a cool, dry place, away from moisture and strong oxidizers, to maintain its stability and effectiveness. Exposure to high humidity can cause caking or degradation. Safety precautions include wearing protective gloves and goggles to avoid skin and eye contact. Inhalation of dust should be minimized by working in well-ventilated areas or using respiratory protection. In case of accidental ingestion or exposure, seek medical attention and refer to the material safety data sheet (MSDS) for specific guidance.
B2B Procurement Guide
When procuring sodium stearate for industrial or commercial use, several factors should be considered to ensure quality and cost-effectiveness. Buyers should verify the CAS number (822-16-2) and request certificates of analysis (CoA) to confirm purity levels, typically ranging from 90% to 99%. Suppliers should be evaluated based on their reliability, production capacity, and ability to provide consistent quality. Bulk purchases often attract discounts, making it economical for large-scale users. Additionally, consider logistical aspects such as packaging options (bags, drums) and lead times to align with production schedules. Establishing long-term partnerships with reputable suppliers can streamline procurement processes.
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