Alkylketene dimer
[CAS# 144245-85-2]

Identification

• Classification: Catalysts and additives >> Polyethylene glycol derivative
• Name: Alkylketene dimer
• Synonyms: AKD
• CAS Registry Number: 144245-85-2

Discovory and Applicatios

Alkylketene dimer (AKD) is a chemical compound widely used in the paper and textile industries. It is an organic compound derived from fatty acids, and its chemical structure consists of a dimeric form of an alkylketene. The compound is produced through a condensation reaction between fatty acid chlorides and ketenes, typically using a base catalyst. The resultant product has a long hydrocarbon tail, which imparts hydrophobic properties to the materials it is applied to. This dimer is known for its excellent ability to improve the water resistance and strength of paper products.

The discovery of alkylketene dimers can be traced back to the early developments in the paper industry, where it was identified as a suitable chemical for enhancing the properties of paper and cardboard. Its use began in the mid-20th century, and it quickly gained popularity for its ability to impart water repellency and improve the durability of paper products. Today, AKD is considered one of the most widely used sizing agents in the paper industry.

One of the primary applications of alkylketene dimer is in the paper and pulp industry, where it is used as a sizing agent. It works by forming a hydrophobic coating on the fibers of paper, which enhances the paper’s resistance to water and oil. This treatment is crucial for producing high-quality writing paper, packaging materials, and other paper products that require resistance to moisture. The use of AKD in paper manufacturing helps improve printability and surface smoothness, contributing to better performance of printed materials. The application of AKD also prevents excessive ink absorption, which can lead to smudging or poor quality prints.

In addition to its role in paper manufacturing, alkylketene dimer is used in the textile industry. It is applied to fabrics to improve water repellency and stain resistance, especially in the production of water-resistant fabrics and outdoor gear. The compound is incorporated into textile treatments to enhance the surface properties of materials, preventing moisture from penetrating the fibers and ensuring that the textile remains dry and comfortable for the wearer. The hydrophobic nature of AKD makes it an ideal choice for producing fabrics that are resistant to stains and dirt, making it valuable for both functional and aesthetic purposes.

The chemical properties of AKD also make it useful as a chemical intermediate in the production of various other chemicals and materials. Its versatility in chemical reactions allows it to be used in creating modified polymers, resins, and coatings. As a result, it has applications beyond paper and textiles, contributing to the development of new materials in industries such as adhesives, paints, and coatings.

From an environmental perspective, alkylketene dimer is generally regarded as safe for use in the applications mentioned, although, like many chemical substances, it is important to handle it with care. The compound does not bioaccumulate significantly, and its biodegradability under typical environmental conditions has been studied. However, regulatory agencies have established guidelines for its safe use, ensuring that it does not pose significant risks to human health or the environment when used appropriately.

In summary, alkylketene dimer is a highly effective sizing agent in the paper industry and serves important roles in textiles and various chemical applications. Its ability to impart water resistance, improve printability, and enhance the durability of paper products has made it indispensable in the production of high-quality paper. Its versatility extends to textiles and other industries, where it provides water repellency and stain resistance. The compound’s proven efficacy and widespread industrial applications ensure its continued relevance in the manufacturing sector.