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Bactericides, Fungicides, antifouling

Benzisothiazolinone used for synthetic emulsion and coating anticorrosion

Benzisothiazolinone used for synthetic emulsion and coating anticorrosion

Microbes are ubiquitous in nature. While they bring many benefits to human life, they also cause many disasters. Because the items with bacteria and mold not only destroy their performance, but also endanger other items as a source of pollution. This article will introduce the use of bactericidal preservatives to prevent synthetic emulsions and coatings from spoiling and mildew, and will focus on several representative bactericidal preservatives.

Reasons for corruption:

Synthetic emulsions are usually aqueous polymer emulsions polymerized by monomers such as acrylate, butadiene, hexenyl acetate, and phenylhexene. Adding pigments, dispersants, surfactants, defoamers, thickeners, etc., can be made into various latex and water-based paints. Since many of these substances are nutrients for the growth of microorganisms and contain water, as long as the environmental temperature is appropriate, the microorganisms will multiply in large numbers.

The main microorganisms that cause spoilage are gram-negative bacteria, especially the genus Aerobacter coli and Pseudomonas, instead of molds as commonly thought. Molds and yeasts are not the main bacteria that cause the spoilage of synthetic emulsions and paints, they only work in a few cases. The main genus of bacteria from synthetic emulsions and paint corruption. The main microorganisms that breed on the coated film are molds, such as convex black, penicillium, and Rhizopus. These bacterial genera are related to the environment in which the coating film is located.

It can be seen that to prevent the spoilage and deterioration of Taiwan-based emulsions and paints, it is important to control Gram-negative bacteria, especially Oxygen coli and Pseudomonas. If it is required that the coating film after painting does not grow mold, you can add some fungicides that are particularly effective for molds while adding the above-mentioned fungicides. Of course, some fungicides are effective for both, such as 1,2-benzisothiazolin-3-one (abbreviated as BIT, foreign trade name Proxel series).

Application of antiseptic and antiseptic

Theoretically, the principle of killing and inhibiting microorganisms by antiseptic and antiseptic mainly promotes the changes of some characteristics of microorganisms. For example, it affects the growth, reproduction, spore formation, germination, expansion, cell mitosis, permeability and respiration of Weishengjun, as well as many other physiological, biochemical reactions and metabolic activities.

Typical antiseptic

As a new generation of antiseptic, 1,2-benzisothiazolin-3-one (BIT series), it is called Proxel CRL and Proxel GX abroad. L and other series.

The bactericide is a solid powder with a melting point of 158°C, a solubility in water of 0.14% at 25°C, and a solubility of 1.5% at 90°C, but the sodium salt of this product is easily soluble in water. This product has high thermal stability. BIT begins to lose weight slightly at 180°C, and loses significant weight at 250°C (heating rate 4°C/min). It is relatively stable to acid and alkali. Can be used in a wide pH range.

BIT has come out in a variety of preparations, forming a series of products to adapt to different anti-corrosion objects. Among these preparations, except that BIT is a solid powder and is insoluble in water, the rest can be dissolved in various water systems at any ratio. At the same time, it is also soluble in many organic solvents. It has a wide range of compatibility with materials that need to be preserved. BIT and its preparations have no corrosive effect on metals.

The original powder of BIT is low-toxic, and the oral LD50 of various preparations is also low-toxic. BIT is considered to be one of the safe antiseptic preservatives. It can be used as a preservative for paper, cardboard and adhesives in contact with dry foods and fatty foods. However, the concentrated solution of BIT preparation is slightly irritating to the skin. When using, it should be prevented from getting into the eyes. Rinse with water when splashed on the skin.

BIT can not only prevent the deterioration of emulsions and coatings. It can also make the coating film have the function of resisting mold attack. Due to the unique properties of BIT (when producing coatings. Because BIT preparations can be dissolved in water at any ratio, it is very convenient to use. After the coating is painted, the active ingredients of BIT are insoluble in water, and they are not afraid of rain.), it is very popular among users.

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