What is stearic acid
Cata Chemical Technology
What substance is stearic acid? Stearic acid is widely used in making cosmetics, plastics cold resistant plasticizer, release agent, stabilizer, surfactant, rubber vulcanization accelerator, waterproof agent, polishing agent, metal soap, metal mineral flotation agent, softener, pharmaceuticals and other organic chemicals. It can also be used as solvent of oil soluble pigment, wax pencil smoothing agent, wax paper polish agent, emulsifier of stearic acid glyceride, etc.
The product is used in the food industry as a lubricant, defoamer and raw material for food additives such as glyceride stearate, sorbitol stearate and sucrose ester. It is used as raw material of auxiliary agent and daily chemical products.
Stearic acid is widely used in the manufacture of PVC plastic pipes, plates, profiles and films. It is a PVC heat stabilizer with good lubricity and good light and heat stability. In plastic PVC pipes, stearic acid helps to prevent "coking" during processing. Adding stearic acid in PVC film processing is a good heat stabilizer and can prevent discoloration of finished film caused by exposure to sulfide.
Most people don't know what oil crayons, hard candy and soap have in common. In fact, there is a link between them: they all contain a key component called stearic acid. Although you may not have noticed it before, once you start to look for it, you will find that many products used every day contain stearic acid, including candles, shaving cream, cosmetics and medicines. However, stearic acid is the leading role in cleaning products.
Stearic acid is one of many fatty acids, which naturally exists in various plant and animal derivatives. Stearic acid is found in animal fats, cocoa butter and vegetable oils. When it is used in cosmetics, stearic acid acts as a thickener and curing agent. Stearic acid can also help soap shape - as well as candles, oil crayons, and hard candy.
Shaping is not why stearic acid is added to soaps and bath products. As a surfactant, stearic acid has a strong cleaning ability. Surfactants are compounds that can help reduce the surface tension of water and enable it to mix with oil and dirt on the skin surface. Because of stearic acid, soap particles can attach to dirt and grease on the skin, making them loose and easily washed away by water.
Stearic acid manufacturers mainly use the oil hydrolysis method for industrial production.
Oil hydrolysis can be divided into three types according to pressure:
1. The hydrolysis period is long and takes tens of hours with the addition of catalyst under normal pressure. The conversion rate of fatty acids is low and the later separation effect is poor.
2. Medium pressure hydrolysis: no catalyst is needed, the hydrolysis cycle is about ten hours, and the conversion rate is basically 90%, which belongs to intermittent reaction and is gradually eliminated in China.
3. High pressure hydrolysis: no catalyst is needed, the hydrolysis cycle is about 5 hours, the conversion rate is basically 98-99%, and continuous production. The stearic acid produced has good color, high content and few impurities.
At present, domestic projects are basically produced by this method. Some technologies are self-developed in China, and some technologies and equipment from abroad are introduced.
The source of domestic stearic acid is basically made from imported palm oil through catalytic hydrogenation, high-pressure hydrolysis, fatty acid dehydrogenation, and vacuum distillation.
Stearic acid exists in animal fats, oils and some vegetable oils in the form of glycerides. These oils are hydrolyzed to obtain stearic acid.
Stearic acid is a kind of fatty acid that widely exists in nature. Almost all oils contain stearic acid in varying amounts. It has a high content in animal fat, such as 24% in butter, less in vegetable oil, 0.8% in tea oil, 6% in palm oil, but 34% in cocoa butter.
The production methods of industrial stearic acid mainly include fractionation method and pressing method. A decomposing agent is added into the hardening oil, and then the crude fatty acid is obtained by hydrolysis, and then the finished product is obtained through water washing, distillation and decolorization. At the same time, the by-product is glycerin.
Stearic acid can also be used as an emulsifier, which means that it can be combined with other substances (such as oil and water), which are usually separated and incompatible. Without stearic acid, your facial cleanser will not remain smooth and creamy, but will be separated like oil and vinegar in salad dressing. What substance is stearic acid? If you have any questions about this, you can directly contact Keita customer service.