STUDY OF THE HYDROPHOBIZING ACTION OF THE DEVELOPED ROSIN EMULSIONS ON PAPER AND CARDBOARD

UDC 676.085.2

  • Chernaya Natalʼya Viktorovna – DSc (Engineering), Professor, Professor, the Department of Chemical Processing of Wood. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: chornaya@belstu.by

  • Herman Natalia Aleksandrovna – PhD (Engineering), Senior Lecturer, the Department of Сhemical Processing of Wood. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: natalka_wow@mail.ru

  • Chernysheva Tamara Vladimirovna – Senior Researcher, the Department of Сhemical Processing of Wood. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: chernysheva@belstu.by

  • Misyurov Oleg Aleksandrovich – PhD student, the Department of Сhemical Processing of Wood. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: omisurov@mail.ru

  • Dashkevich Svetlana Arkadʼyevna – Trainee Junior Researcher, the Department of Сhemical Processing of Wood. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: dashkevich@belstu.by

DOI: https://doi.org/10.52065/2520-2669-2023-265-1-7

Keywords: rosin emulsion, resin acids, modification, neutralization, stabilization, dispersion system, water-repellent properties.

For citation: Chernaya N. V., Herman N. A., Chernysheva Т. V., Misyurov O. A., Dashkevich S. A. Study of the hydrophobizing action of the developed rosin emulsions on paper and cardboard. Proceedings of BSTU, issue 2, Chemical Engineering, Biotechnologies, Geoecology, 2023, no. 1 (265), pp. 62–70. DOI: https://doi.org/10.52065/2520-2669-2023-265-1-7 (In Russian).

Abstract

The article is devoted to the study of ways to increase the hydrophobicity of paper and cardboard by improving the hydrophobic properties of new rosin emulsions (CE), obtained on the basis of modified rosin products. New high-resin and neutral rosin emulsions differ in the structure of particles of the dispersed phase due to the use of stabilizing substances of various nature in CE: modified starch MK-1, surfactant, latex dispersion, ammonium caseinate. The studies were carried out in comparison with known analogues that do not contain a stabilizing agent.

The chemical nature and concentration of the stabilizing agent have a significant impact on the aggregative stability and stability of rosin emulsions. The effectiveness of the studied stabilizers corresponds to the ordered sequence: ammonium caseinate > surfactant > latex dispersion > modified starch.

Rosin emulsions have high aggregative stability when the following compounds are used as stabilizing agents: surfactants – samples 13a (C = 1.0 wt. %), 13 (C = 2.0 wt. %) and 4 (C = 3.0 wt %); latex dispersion − samples 11 (C = 1.0 wt. %) and 15 (C = 1.5 wt. %); ammonium caseinate − samples 14 (C = 16.0 wt. %) and 10 (C = 19.0 wt. %). It has been established that the effectiveness of the hydrophobic action of new rosin emulsions depends not only on the structure of the particles of the dispersed phase, but also on its content in sized fibrous suspensions, the optimal concentration of which is R = 2% absolutely dry matter.

A comparative analysis of the results of the study indicates an increase in water-repellent properties in comparison with known analogues by 4.0–25.4%, depending on the nature and concentration of the stabilizing substance.

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15.11.2022