The nonionic surfactant can degrade human body temperature quickly and has excellent biodegradation performance

2021-04-21 16:51:38

In order to adapt to the international development trend, the surfactant industry in China started late and the foundation was weak. In order to adapt to the international development trend, it should focus on the development of glycoside surfactants; systematically research and develop soybean phospholipid surfactants, which have both surface activity and biological activity, and are special surfactants; develop sucrose fatty acid ester series products, sucrose fatty acid ester has non-toxic, odorless and non irritant properties It can be used as food additive (emulsifier) and study the application of surfactant in industrial catalysis to reduce the industrial production cost. It is worth noting that the two kinds of non-ionic surfactants, APG and APA, which are produced by the reaction of glucose and fatty alcohol or fatty acid, have the characteristics of mild, fast biodegradation, excellent performance and synergistic effect with other surfactants; the alcohol ether carboxylate (AEC) is resistant Ca2 + and Mg2 + are more and more powerful, which are favored by people.

Consider the characteristics of surfactants. The critical micelle concentration (CMC), that is, the low concentration of micelles formed by surfactant in solution, is related to the appropriate amount of surfactant can be used.

The cloud point phenomenon exists in polyoxyethylene type nonionic surfactants, that is, when the temperature is low, the oxygen atom of polyoxyethylene ether of the nonionic surfactant is connected with the water molecule by hydrogen bond, so it is easy to dissolve in water to become a clear solution. After the temperature rises to a certain extent, the molecular thermal movement will be increased, and the hydrogen bond will be destroyed. The surfactant will be separated and layered in the water, and the original transparent one will be transparent The solution becomes a white, turbid emulsion. The temperature at this time is called cloud point. The cloud point value is related to the high temperature allowed for use of nonionic surfactants.

The hydrophilic oil affinity equilibrium value HLB of surfactant. Surfactant is composed of oil-related groups and water soluble hydrophilic groups which are easy to dissolve in oil substances. According to the different uses of surfactants, the hydrophilic and hydrophobic parts of the molecule are required to be kept in proper proportion. The HLB value of surfactant is between 1 and 40, and the hydrophilicity is enhanced from small to large. The different deinking systems are generally o/w dispersion systems, so the surfactants with HLB value of 8-18 or greater than 18 are selected to be surfactants suitable for O / W dispersion systems.