In general, the surface tension of the fiber surface is relatively low and is not easily wetted by water. Wetting theory states that in order for a fiber having low energy surface properties to be completely wetted by water, the surface tension of the water is required to be equal to or less than the critical surface tension of the fiber.

The polysaccharide is synthesized by a transglycosylation method to synthesize an alkyl glycoside. Alkyd polyglycoside (APG) has the characteristics of anionic and nonionic surfactants, low surface tension, high activity, strong decontamination ability, rich and delicate foam, stable, non-toxic, non-irritating, It has good compatibility and easy degradation, and can be widely used in various fields of chemical production. It is called “green” surfactant.

Certain nonionic emulsifiers are the primary surfactants used in the cosmetic industry. As an emulsifier for formulating skin care lotions, alkyl glycosides must have good compatibility and compatibility. In order to meet the requirements of safety, viscosity, drainage, etc., the polyether-modified silicone-containing silicone surfactant is an emulsifier alkyl phosphate ester, amino acid surfactant, commonly used in the preparation of silicone oil emulsion. A fatty acid ester derivative of a glucoside and a sucrose ester alkyl glycoside polyglycerol fatty acid are also commonly used emulsifiers.

In the pickling, a large amount of acid mist will be generated, which will affect the health of the workers and pollute the environment. At the same time, it will corrode the plant and equipment. In order to improve the descaling effect of pickling and prevent acid corrosion, in the sulfuric acid or nitric acid in pickling. The addition of a surfactant can suppress the acid mist, accelerate the pickling speed and prevent the occurrence of over-corrosion. Formulation: 1~10% hydrochloric acid 1~8% nitric acid 0.1~20% of phenolic acid polyoxyethylene.

The surfactant can change (usually reduce) the interfacial tension of the two phases. It is a kind of amphiphilic compound composed of a hydrophilic group and a lipophilic group. The lipophilic (hydrophobic) group is composed of a hydrocarbon chain, and the hydrophilic group is composed of a hydrophilic group. An oxygen-containing group, such as a hydroxyl group, a carboxyl group, an ether group or the like. Therefore, the nature of the surfactant depends not only on the size and shape of the hydrophobic group, but also on the type of hydrophilic group.

A new generation of green alkyl glycosides is a nonionic surfactant that reacts with glucose and fatty alcohols or fatty acids in natural raw starch to form alkyl polyglycosides (APG) and glucose amide (APA), which are less irritating to humans. It has the characteristics of fast biodegradation, excellent performance and synergy with other surfactants.

China's coating alkyl glycoside industry is developing rapidly, and the raw materials related to coatings have become the just-needed products of many enterprises, although many foreign giants such as Evonik, Dow and BYK are stepping up their pace in the Chinese market, but domestically. Local companies will not be willing to hand over this big "cake", the competition is fierce. However, in the face of multinational giants, how local companies should take advantage of their advantages and seize market opportunities in the future market is not an easy task, but I think this is not something that cannot be achieved.

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.