Magnesium Stearate Cas:557-04-0
Magnesium stearate also known as magnesium octadecanoate. Chemical formula Mg(C18H35O2)2. Molecular weight 591.27. A fine white glossy powder or lump. Industrial products contain a small amount of oleic acid and 7% magnesium oxide, odorless, tasteless. Slightly soluble in water, soluble in hot ethanol solution. Strong acids decompose into stearic acid and corresponding magnesium salts. It is prepared by reacting molten stearic acid with magnesium oxide or sodium stearate solution with dilute magnesium sulfate solution. It is used as smoothing agent for paint, powder molding agent for tablets, stabilizer for plastic products, etc.
Magnesium stearate cas:557-04-0
The product is used as polyvinyl chloride heat stabilizer, as well as cosmetics annual flour, moisturizing ointment and pharmaceutical tablet raw materials (excipient, lubricating drug); It is used to make the lubrication of wood powder bright and transparent. Paint industry for transparent smooth agent. Metal soaps used as polyvinyl chloride stabilizers are mainly advanced fatty acid salts of cadmium, barium, calcium, zinc and magnesium. The base is stearic acid and lauric acid salts. The performance of metal soap stabilizers varies with the types of metals and different acid roots. The general rule is as follows: Heat resistance: cadmium and zinc soaps have good initial heat resistance; Barium, calcium, magnesium, strontium soap has good long-term heat resistance, and lead soap is in the middle. Weather resistance: cadmium, zinc, lead, barium, tin soap is better. Processability: the lubricity of lead and cadmium soap is good, but the acid root also has a great influence on the lubricity. In terms of the same metal, aliphatic is better than aromatic, and the longer the chain in aliphatic acid, the better the lubricity. Barium, calcium, magnesium and strontium soaps have poor lubricity but good gelation. Compaction property: barium, calcium, magnesium and strontium soaps are easy to produce compaction, while zinc, cadmium and lead soaps are not easy to produce compaction. The longer the molecular chain of fatty acid soaps, the more severe the pressure precipitation, and the more harmful the spray cream. Lead and cadmium soaps have high toxicity and sulfide pollution. Calcium and zinc soap are used in non-toxic formula. Barium and zinc soaps are widely used in the formula of pollution resistance to vulcanization. Magnesium stearate is considered non-toxic and is permitted in the United States, Germany and Japan for use in food contact products, but is not widely used as a heat stabilizer for PVC. This variety is included in our pharmacopoeia and in some other national pharmacopoeia, where the contents of magnesium, moisture, heavy metals, iron, sulphate and chloride are regulated.
