Aldehyde starch is a modified form of starch that has found its way into a variety of industrial and consumer products. It is a type of chemically modified starch, which means that its structure has been altered through a chemical reaction. In this article, we will explore what aldehyde starch is, its properties, production, and applications.
What is Aldehyde Starch?
Aldehyde starch is created by using periodic acid/periodate ions to turn certain hydroxyl groups into aldehyde groups. These aldehyde groups can react with other chemical groups to form new chemical bonds. Dialdehyde starch is the most common form of aldehyde starch and is created by treating starch with a solution of periodic acid/periodate ions. The reaction results in the conversion of some of the hydroxyl groups on the starch molecules into aldehyde groups.
Properties of Aldehyde Starch
Aldehyde starch has some unique properties that make it useful in a variety of applications. One of the most important properties of aldehyde starch is its ability to form strong crosslinks with other molecules. These crosslinks make it a popular choice for use in wet strength agents, which are added to paper products to make them stronger and more durable when wet.
In addition to its ability to form strong crosslinks, aldehyde starch also has good water solubility and film-forming properties. It can be used as a binder in a variety of applications, including adhesives, coatings, and papermaking.
Production of Aldehyde Starch
The production of aldehyde starch begins with the selection of a suitable source of starch. Corn, potato, and tapioca are all common sources of starch used to produce aldehyde starch. The starch is then treated with periodic acid/periodate ions, which converts some of the hydroxyl groups on the starch molecules into aldehyde groups. The resulting dialdehyde starch is then purified and dried.
Applications of Aldehyde Starch
Aldehyde starch has a wide range of applications in a variety of industries. One of the most common uses of aldehyde starch is as a wet strength agent in the paper industry. It is added to paper products to improve their strength and durability when wet, which is particularly important for tissue and sanitary products.
Aldehyde starch can also be used as a binder in coatings and adhesives. Its film-forming properties and ability to form strong crosslinks make it a popular choice for use in these applications.
In the textile industry, aldehyde starch is used to impart crease-resistance and shrinkage control to fabrics. It is also used as a sizing agent to improve the texture and appearance of textiles.
In the food industry, aldehyde starch is used as a thickener and stabilizer in a variety of products. It is particularly useful in acidic products, where other thickeners may break down.
Conclusion
In summary, aldehyde starch is a modified form of starch that has found its way into a variety of industrial and consumer products. Its unique properties, including its ability to form strong crosslinks and its water solubility, make it a popular choice for use in a variety of applications. From wet strength agents in the paper industry to thickening agents in the food industry, aldehyde starch has a wide range of applications and is an important ingredient in many products.