Alkyl glucoside has good foaming power and foam stability.

2021-12-10 16:47:16

The surface activity of alkyl glycosides is better than other common surfactants. With the increase of alkane chain, the critical micelle concentration decreases and the activity increases significantly. Alkyl glucosides have good foaming power and foam stability. Due to the special hydrophilic group structure and unique oligomer distribution, alkyl glycosides have very good compounding properties. They can be compounded with non-ionic, anionic, cationic and other surfactants and improve their activity. Alkyl glycosides have low toxicity and can be prepared from renewable resources such as starch and glucose. They have good biodegradability, fast and complete degradation, so they have good environmental compatibility.

At present, direct glycosidation and two-step synthesis are commonly used in industry. The direct glycosidation method has mild reaction conditions, easy control of average polymerization degree and good product quality. Although two-step synthesis has some disadvantages, its reaction process is easy to control, so it is also used more at present.

In the processing of pesticide dosage forms, the use of surfactant with excellent performance and easy degradation instead of traditional additives can not only improve the preparation performance and improve the efficacy, but also reduce the amount of organic solvents and reduce the environmental pollution of pesticides and organic solvents. Therefore, it has become one of the effective ways to improve the environmental safety of pesticides.

Alkyl polyglycoside (APG) is a new type of non-ionic surfactant, which can be prepared from renewable resources - starch and its derivatives such as glucose and natural fatty alcohol. It has many advantages of non-ionic and anionic surfactants. It not only has good surface activity, strong foaming ability and good compatibility, but also can be used in high concentration acids, bases Salt solution still has high solubility, no cloud point and gel phenomenon, and is non-toxic, non irritating, biodegradable quickly and thoroughly, and has no pollution to the environment. It is known as "surfactants" and "new generation of green surfactants". APG is widely used in detergents, industrial emulsifiers, food additives, pesticide preparations and so on. This paper briefly introduces the properties, preparation and application of this kind of surfactant, with emphasis on its application in pesticide processing.

The commonly used catalysts in the synthesis of alkyl glycosides are protonic acid and Lewis acid, which are not very effective and inconvenient to use. Later, people developed solid heteropoly acids and some composite catalysts, such as PW12 / SiO2 solid heteropoly acids prepared from sodium silicate and tungstophosphoric acid. Some other composite catalysts have also been prepared, which may also be some solid acids.