It is understood that stearic acid is at room temperature Below is a white flake, bead or block solid. It is composed of saturated fatty acids mainly C16 and C18. It is insoluble in water, slightly soluble in benzene and carbon disulfide, easily soluble in hot ethanol, non-toxic and tasteless, and has the general chemical properties of organic carboxylic acids. Stearic acid is a fatty acid widely found in nature. Almost all oils contain stearic acid in varying amounts. The content is higher in animal fats. For example, the content in butter can reach 24%, and in vegetable oils it is less. , tea oil is 0.8%, palm oil is 6%, but the content of cocoa butter is as high as 34%. There are two main production methods for industrial stearic acid: fractionation method and pressing method. A decomposing agent is added to the hardened oil, and then it is hydrolyzed to obtain crude fatty acids, which are then washed, distilled, and decolorized to obtain the finished product, while glycerol is produced as a by-product.
The application and function of stearic acid in cultural and educational supplies are as follows:
Stearic acid is an important raw material for manufacturing crayons. Stearic acid can improve crayons. Stearic acid accounts for 30% of the gloss and opacity of crayons;
Stearic acid can also be used in pencil cores to increase the hardness and slipperiness of the pen cores and improve coloring power and adhesion. Stearic acid can also be used as an adhesive for solid glue;
Art pigments can use a small amount of stearic acid and glycerin.
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