OBTAINING AND PHYSICAL AND CHEMICAL PROPERTIES OF ANIONIC AQUEOUS EPOXY-DIAN OLIGOMER DISPERSIONS
Rubrics: 2. CHEMICAL TECHNOLOGY
Authors:
1.
State Scientific Institutuon "The institute of general and inorgenic chemistry of the National Academy of Sciences of Belarus"
(laboratoriya himiko-analiticheskih issledovaniy mineral'nogo syr'ya, Seniour resercher)
employee from 01.01.2016 to 01.01.2025
Minsk, Belarus
employee from 01.01.2016 to 01.01.2025
Minsk, Belarus
2.
Institut obschey i neorganicheskoy himii Nacional'noy akademii nauk Belarusi
Type:
Article
Pages:
from 73
to 80
Status:
Published
Received:
28.01.2026
Accepted:
28.01.2026
Published:
28.01.2026
Language:
Russian
Keywords:
DISPERSIONS, ANIONIC SURFACTANTS, EPOXY-DIANE OLIGOMER, SURFACE TENSION, GRANULOMETRIC COMPOSITION, DISPERSION, STABILITY, STRUCTURAL-RHEOLOGICAL AND ELECTROKINETIC PROPERTIES, OPTICAL MICROSCOPY
Abstract:
The physicochemical properties of thermodynamically metastable systems, aqueous dispersions of hydrophobic epoxy oligomer based on bisphenol A and epichlorohydrin, have been studied. Anionic surfactants such as oleic acid and triethanolamine oleate were used as emulsifiers and stabilizers in an alkaline medium at pH = 11.5; surface tension isotherms for them were constructed and the colloidal-chemical characteristics at the liquid / gas interphase boundary were determined. The process of obtaining concentrated dispersions (dispersed phase content - 60 %) combined different types of action on two-phase mixtures of the dispersed phase and dispersion medium: 1) adsorption spontaneous emulsification at 65-75 0C of an aqueous solution of a surfactant and a mixture of an oligomer plasticized with epoxidized rapeseed oil; 2) dispersion using a rotor-stator device until a liquid homogeneous system of a milky white color was obtained. A study of their structural-rheological, dispersion and electrokinetic properties was conducted, and the microstructure and storage stability were visually assessed. It has been established that in order to obtain protective coatings based on stable film-forming dispersions it is most effective to use a more homogeneous and finely dispersed colloidal system, which contains oleic acid as an emulsifier with a concentration in the solution of 1.2 wt.%, characterized by the smallest median particle diameter and maximum specific surface area, stronger structural bonds, which contributes to a longer preservation of the aggregate stability of the dispersion. The results obtained may be of interest to specialists developing new water-dispersible materials and coatings based on them for the paint and varnish, construction, textile and petrochemical industries.
The physicochemical properties of thermodynamically metastable systems, aqueous dispersions of hydrophobic epoxy oligomer based on bisphenol A and epichlorohydrin, have been studied. Anionic surfactants such as oleic acid and triethanolamine oleate were used as emulsifiers and stabilizers in an alkaline medium at pH = 11.5; surface tension isotherms for them were constructed and the colloidal-chemical characteristics at the liquid / gas interphase boundary were determined. The process of obtaining concentrated dispersions (dispersed phase content - 60 %) combined different types of action on two-phase mixtures of the dispersed phase and dispersion medium: 1) adsorption spontaneous emulsification at 65-75 0C of an aqueous solution of a surfactant and a mixture of an oligomer plasticized with epoxidized rapeseed oil; 2) dispersion using a rotor-stator device until a liquid homogeneous system of a milky white color was obtained. A study of their structural-rheological, dispersion and electrokinetic properties was conducted, and the microstructure and storage stability were visually assessed. It has been established that in order to obtain protective coatings based on stable film-forming dispersions it is most effective to use a more homogeneous and finely dispersed colloidal system, which contains oleic acid as an emulsifier with a concentration in the solution of 1.2 wt.%, characterized by the smallest median particle diameter and maximum specific surface area, stronger structural bonds, which contributes to a longer preservation of the aggregate stability of the dispersion. The results obtained may be of interest to specialists developing new water-dispersible materials and coatings based on them for the paint and varnish, construction, textile and petrochemical industries.
Keywords:
DISPERSIONS, ANIONIC SURFACTANTS, EPOXY-DIANE OLIGOMER, SURFACE TENSION, GRANULOMETRIC COMPOSITION, DISPERSION, STABILITY, STRUCTURAL-RHEOLOGICAL AND ELECTROKINETIC PROPERTIES, OPTICAL MICROSCOPY
DISPERSIONS, ANIONIC SURFACTANTS, EPOXY-DIANE OLIGOMER, SURFACE TENSION, GRANULOMETRIC COMPOSITION, DISPERSION, STABILITY, STRUCTURAL-RHEOLOGICAL AND ELECTROKINETIC PROPERTIES, OPTICAL MICROSCOPY
