CAS 55965-84-9: TCBIO AF15 Kathon – Efficient Preservation for Coatings, Adhesives, and Circulating Water Systems

In the coatings, adhesives, and industrial circulating water sectors, microbial contamination is a persistent challenge that restricts industry development, directly impacting product quality and equipment operation. During storage and application, coatings and adhesives are vulnerable to mold and bacterial attack, leading to spoilage, unpleasant odors, and abnormal viscosity changes that hinder proper use. In industrial circulating water systems, the rapid proliferation of algae, bacteria, and fungi can form biofouling and slime, clogging pipelines, reducing heat transfer efficiency, and accelerating equipment deterioration.

To tackle these preservation issues, conventional solutions often rely on single active ingredients or simple blends, such as formaldehyde releasers, benzisothiazolinone (BIT), and organomercury preservatives. However, formaldehyde releazers offer limited efficacy and release harmful substances that affect human health and the environment. BIT has a narrow antimicrobial spectrum, failing to suppress a broad range of microorganisms, and suffers from poor compatibility with coating and adhesive components. Organomercury compounds, being highly toxic and environmentally hazardous, have been gradually phased out. The common drawbacks of these traditional approaches include unstable preservation performance, narrow antimicrobial coverage, and significant environmental and health concerns—making it difficult to balance efficacy with sustainability. Moreover, frequent re-dosing increases operational costs.

TCBIO AF15 (along with AF20, AF25, and AF35) is a Kathon-based preservative with CAS No. 55965-84-9 and molecular formula C₈H₉ClN₂O₂S₂. Its core structure consists of a blend of 2-methyl-4-isothiazolin-3-one and 5-chloro-2-methyl-4-isothiazolin-3-one. TCBIO AF15 is a proprietary Kathon grade developed by Guangdong Tianchen Biology, with AF20, AF25, and AF35 being other variants in the same product family. This Kathon series serves as a high-performance, broad-spectrum industrial preservative designed to overcome the above challenges. It works by disrupting microbial cell membranes and enzyme systems, thereby inhibiting microbial reproduction and delivering robust preservation.

When added to coatings and adhesives, TCBIO AF15 effectively prevents microbial growth, avoiding spoilage, odor, and viscosity changes, ensuring product stability during storage and use without complex formulation. In industrial circulating water systems, it efficiently controls algae, bacteria, and fungi, preventing biofouling and slime formation, thereby maintaining pipe integrity and heat exchange efficiency. The product offers stable performance, good compatibility with various systems, ease of use, and low dosage requirements.

Compared with other preservatives, TCBIO AF15 offers clear advantages. Unlike formaldehyde releasers, it releases no harmful substances and is more environmentally friendly. Compared with BIT, it has a broader antimicrobial spectrum, effectively inhibiting a wide range of microorganisms, and exhibits excellent compatibility without reacting with other formulation components. Unlike organomercury preservatives, it has low toxicity and minimal environmental impact, complying with current environmental regulations. Additionally, its well-designed blended system ensures strong stability and long-lasting preservation, reducing the need for frequent re-dosing and lowering overall costs.

In the Southeast Asian market, Kathon is mainly used in coatings, adhesives, and industrial circulating water, while gradually expanding into textile printing and dyeing, leather, papermaking, and other industries, precisely meeting local industrial needs. In China, as environmental regulations become increasingly stringent, the demand for efficient and eco-friendly preservatives continues to grow. The TCBIO AF15 series from Guangdong Tianchen Biology is gaining wider adoption, and manufacturers are continuously optimizing product performance to suit more industrial scenarios. Looking ahead, its application scope is expected to further expand, with stable and positive market development trends.

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