Conventional surfactants have a low molecular weight and generally do not completely cover the surface area of the particles, and are also easily transferred from the surface, resulting in problems such as flocculation generation and increased particle adhesion during storage. In general, the dispersibility of a surfactant depends on two factors, the molecular weight and the type of lipophilic group. In order to improve the long-term stability of the formulation, it can be seen that the action of the water-based dosage form surfactant as an emulsifier and a dispersing agent is increasing.

For example, in deinking by washing, chemicals such as sodium hydroxide, water glass, hydrogen peroxide and nonionic surfactants have a pH of 9 to 11 during deinking; in flotation deinking, various fatty acids are trapped. The concentration agent is carried out under the condition that calcium ions are involved, and the pH value in this process can be as high as 11-12. With the development of printing technology, the quality of recycled paper and the requirements of environmental protection, the disadvantages of alkaline deinking are becoming more and more obvious. For example, the COD of wastewater is high, and the ground wood pulp is easily alkaline and black. A very promising and promising method of deinking - neutral deinking.

Alkyl glycosides have extremely high surface activity, good detergency and biodegradability, and are extremely irritating to the skin and mucous membranes, low toxicity, good compatibility with other surfactants and strong broad-spectrum antibacterial It has a lot of uses in the fields of detergent, cosmetics, food, and biochemistry.

The direct glycosidation method is also called a one-step method, and is a method for directly synthesizing an alkyl glycoside under the action of an acidic catalyst using glucose and a high-carbon fatty alcohol as raw materials. In the direct synthesis process, alcohol and sugar directly acetalize to synthesize glycosides, without the introduction of lower alcohols. The raw material cost is reduced, the process flow is more concise, and the reaction speed is faster. Compared with the transglycosylation method, the direct glycosidation process has the advantages of high glycosidic yield,

The direct glycosidation method is also called a one-step method, and is a method for directly synthesizing an alkyl glycoside under the action of an acidic catalyst using glucose and a high-carbon fatty alcohol as raw materials. In the direct synthesis process, alcohol and sugar directly acetalize to synthesize glycosides, without the introduction of lower alcohols. The raw material cost is reduced, the process flow is more concise, and the reaction speed is faster. Compared with the transglycosylation method, the direct glycosidation process has the advantages of high glycosidic yield, short reaction time, short synthetic route, low energy consumption, easy operation and low cost. However, due to the insolubility of glucose and higher alcohols, the research hotspot of this synthesis method is still in the improvement of the choice of catalyst. Commonly used catalysts are p-toluenesulfonic acid, dodecylbenzenesulfonic acid, composite catalysts and the like.

The preparation methods of alkyl glycosides include Fischer method, Koenigs-Knorr method, tin tetrachloride method, starch degradation method, enzyme catalytic method, direct glycosidic method and transglycosylation method. At present, the domestic industrial production method is mainly the transglycosylation method.

Although China's chemical alkyl glycoside industry ended its rapid development for ten years in 2013, it started to develop at low and medium speeds, but the overall growth rate is still higher than the national economic growth rate in the same period. According to statistics, China has become the world's largest chemical producer. The output of important bulk products such as methanol, fertilizer, pesticides, chlor-alkali, tires and inorganic raw materials ranks first in the world.

A product obtained from the hemiacetal hydroxyl group and the fatty alcohol hydroxyl group of glucose, which lose one molecule of water under the catalysis of a strong acid. The synthesized alkyl polyglycoside contains a large amount of free fatty alcohol and cannot be sold as a product. It needs to be refined. The APG produced by using C8-C10 alcohol and C12-14 alcohol is water-soluble...

Amino acid surfactant alkyl glycoside is a surfactant obtained by reacting amino acids with various fatty acids. It is mild in nature, strong in cleansing power, fine in foam, high in biodegradability, and compatible with various surfactants. It is a personal care product. An ideal substitute for traditional surfactants such as AES and K12.

The transalkylglycosylation process is also called a two-step process. First, a reaction between glucose and a lower alcohol produces a low-carbon chain glycoside, and an alcohol exchange reaction between a lower-carbon chain glycoside and a higher-carbon alcohol produces a high-carbon chain glycoside. The method better solves the problem of compatibility of glucose and higher alcohol among raw materials, makes synthesis easier to implement, and overcomes the disadvantages of caramel production during direct glycosidation, but the process is complicated, and low carbon glycosides and high The conversion of carbon glycosides is generally not very complete.

Among the series of alkyl glycosides, alkyl glycosides are particularly effective as a nonionic surfactant for the removal of oily soils. The use of alkyl glycosides in laundry detergents has the following advantages:

Alkyl polyglycoside surfactant, synthesized from renewable resources natural fatty alcohol and glucose, is a new comprehensive nonionic surfactant with both nonionic and anionic surfactants and high surface activity. Good ecological safety and compatibility are internationally recognized as the preferred "green" functional surfactants.

In the world of the cosmetics industry, surfactants with a wide variety of properties and different properties are playing an increasingly important role. The 21st century cosmetics industry will fully integrate the high-tech achievements of various contemporary disciplines, and the variety, performance and safety of products will be further improved.