Application of Emulsifier OS-15

Emulsifier OS-15 is a non-ionic emulsifier with a chemical composition of fatty alcohol polyoxyethylene ether and an HLB value of 14-16. Its appearance is a milky white paste to solid substance, with a cloud point of 80-88 ℃ (5% NaCl solution) and a pH value of 5.0-7.0 (1% aqueous solution).

In this paper, 2- (thiocyanomethyl thio) benzothiazole (TCMTB) was emulsified by emulsifier OS-15 combined with cationic surfactant 1227, 1631 and dioctyl dimethyl ammonium bromide (D822) respectively to prepare stable mildew inhibitor lotion.

Compound of TCMTB and Surfactant

Mix the quantitative emulsifier OS-15 with three types of cationic surfactants to form an emulsifier system. Dissolve it completely at 30-40 ℃, add TCMTB, and slowly add a certain amount of distilled water and cosolvent while stirring on a glass rod. Stir at 600-800 r/min for 30 minutes to obtain a yellow brown viscous liquid compound product with self emulsifying function.

Dispersion stability of composite emulsified TCMTB with OS-15 and cationic surfactant

Since TCMTB is insoluble in water, it needs to be made into lotion before use for convenience. In this experiment, cationic surfactants 1227, 1631, and D822 were used in combination with nonionic emulsifier OS-15 to emulsify TCMTB.

With the increase of TCMTB addition, the color of lotion deepened until it was close to the color of TCMTB stock solution. When OS-15 is emulsified with three cationic surfactants respectively, and the total mass of the emulsification system is greater than the mass of TCMTB, a stable lotion can be prepared, and the particle size of the lotion is very small and fine; When the total mass of the emulsifier system is 80% of the mass of TCMTB, the system formed by the combination of OS-15 and 1227 to emulsify TCMTB is unstable, while the other two systems are stable. This may be due to the presence of benzene rings in the molecular structure of 1227, which results in insufficient strength of the double layer formed during emulsification and poor emulsification effect; However, when the total mass of the three emulsifier systems is less than 80% of the mass of TCMTB, stable lotion cannot be prepared. However, too much emulsifier can form a stable lotion, but it relatively reduces the effective content of the main anti mold component TC-MTB, which will adversely affect the bactericidal performance of the anti mold agent. Therefore, in the OS-15 and 1227 emulsifier systems, the total amount of emulsifier is 100% of TCMTB; Similarly, in the OS-15 and 1631/D822 composite emulsion system, the emulsification effect is better when the total amount of emulsifier is 80%.

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