Study on the Preparation Process and Properties of Dioctadecyldimethylammonium Chloride_Industrial Additives

Background and overview^[1]

Currently, the most commonly used cationic emulsifier in personal care products is dioctadecyldimethylammonium chloride (TA-100). Dioctadecyldimethylammonium chloride is a white to slightly yellow paste or solid. Dioctadecyldimethylammonium chloride is slightly soluble in water, soluble in organic solvents such as acetone and ethanol, and easily absorbs moisture in the air. Dioctadecyldimethylammonium chloride has excellent antistatic, sterilizing, antibacterial, antiseptic, corrosion inhibition, solubilizing, emulsifying, and dispersing properties. Dioctadecyldimethylammonium chloride is resistant to light, acid and hard water.

Dioctadecyldimethylammonium chloride can be used as a disinfectant, bactericide, preservative, antistatic agent, emulsifier, dispersant, flocculant, and deodorant.

Manufacturing methods and processes^[1]

Octadecyl chloride and octadecyldimethylamine are obtained by the reaction.

Apply^[2-3]

Report 1,

CN201811117200.X reports a clothing disinfectant. The clothing disinfectant of the present invention is characterized by: including alcohol, sodium hypochlorite, octadecyldimethylammonium chloride, Houttuynia cordata extract, Forsythia suspensa extract, coptis extract, Bupleurum extract, and Rehmannia glutinosa extract. material, Cnidoma monnieri extract; the parts by weight of each component are: 100 parts of alcohol, 15-25 parts of sodium hypochlorite, 5-12 parts of dioctadecyldimethylammonium chloride, and 3-11 parts of Houttuynia cordata extract. 2-9 parts of Forsythia suspensa extract, 1-6 parts of Coptis chinensis extract, 3-8 parts of Bupleurum extract, 5-11 parts of Rehmannia glutinosa extract, and 2-9 parts of Cnidium monnieri extract. The invention can be directly used for clothing disinfection, has good disinfection effect and has no side effects on the human body.

Report 2,

CN201410520034.3 discloses raw cotton fiber dyeing and finishing auxiliaries for color spinning processing and their applications. The pretreatment auxiliary consists of octadecylmethylbenzyl ammonium chloride 0.1%~5%, octadecylmethylbenzyl ammonium chloride, Alkyl dimethyl ammonium chloride 0.05% ~ 2%, dodecyl dimethyl benzyl ammonium chloride 5% ~ 20%, fatty alcohol polyoxyethylene ether 10% ~ 20%, sodium alkyl sulfonate 5 %~20%, sodium alkyl sulfate 5%~20%, water 13%~74.85%; finishing aids include cationic softener 5%~20%, silicone softener 5%~20%, Dioctadecylmethylbenzyl ammonium chloride 0.1%~5%, disoctadecyldimethylbenzyl ammonium chloride 0.05%~2%, dodecyldimethylbenzyl ammonium chloride 5%~ 20%, 33%~84.85% water. The invention also relates to a method for dyeing and finishing raw cotton using auxiliaries, which solves the problem of poor spinnability of fibers after processing raw cotton using traditional methods.

Property research^[4]

Guo Yiguang and others used dynamic light scattering, transmission electron microscopy, polarizing light microscopy and other methods to study the size and morphology of the internal aggregates of the cationic surfactant dioctadecyldimethylammonium chloride (TA-100) aqueous solution. The rheological properties of the solution, as well as the microstructure of the lyotropic liquid crystal phase formed by TA-100 surfactant, the results show that for surfactant solutions within the studied mass fraction range, when the surfactant mass fraction is relatively low , the solution is mainly composed of spherical aggregates with smaller particle sizes (20~30nm). As the mass fraction of surfactant continues to increase, irregular surfaces with larger sizes (~500nm) appear in the solution. Active agent aggregates, and their proportion in the solution changes with the change of surfactant mass fraction. The differences in the morphology and interaction of aggregates in solutions with different mass fractions of surfactants lead to different rheological properties of the solutions. When the mass fraction of surfactants in the solution is low, the mixed solution is a Newtonian fluid; as the surface activity increases As the mass fraction of the agent increases, the mixed solution changes from a Newtonian fluid to a plastic fluid. The thixotropic properties of the system also undergo regular changes, transitioning from Newtonian fluid to negative thixotropic fluid and then to composite thixotropic fluid. Polarized light microscopy observation results show that the two relatively long hydrophobic chains of TA-100 itself lead to strong hydrophobicity of the aggregates formed, which is conducive to further orderly arrangement, resulting in a cross-shaped texture layer at a lower mass fraction. Generation of liquid crystals.

References

[1] Surfactant Encyclopedia

[2][Invented in China] CN201811117200.X Clothing Disinfectant

[3][China invention, China invention authorization] CN201410520034.3�Raw cotton fiber dyeing and finishing auxiliaries and applications for color spinning processing

[4]Guo Yiguang, Zhao Na, Shang Yazhuo, Liu Honglai. Properties of octadecyldimethylammonium chloride aqueous solution [J]. Journal of East China University of Science and Technology (Natural Science Edition), 2011, 37(02) ):186-192.