Hydrophobization and strengthening of cellulose materials from secondary resources

The influence of the sizing agent and filler on the physical-mechanical and surface properties of paper from the cellulose mass of the inner layer of the bark of mulberry tree branches has been studied. According to standard methods, the mechanical strength and absorbency were studied. Surface absorbency for one-side wetting was determined by the method of Cobb(30), by determining the mass of water absorbed by the paper surface when wetting one side of the test sample. It was found that it is advisable to add a sizing agent in the range from 1 to 1.5 g per 100 g of dry cellulose raw materials, since an increase in the additive to 2 g helps to reduce the interfiber bonding forces by 21 %. The addition of 6 g of kaolin affects the distance between the fibers, which reduces the mechanical adhesive forces by 12.5 %. During the analysis of the surface properties of paper samples, the sizing efficiency was found to be from 22.5 to 30 % with an increase in the addition of sizing glue, which can be explained by densification of the structure, which prevents the penetration of aqueous solutions. The addition of 2 to 6 g of kaolin also increases water resistance from 17.5 to 25 %. With the help of a mathematical model, rational values of absorbency were revealed with a composition of 92 %, with a sizing agent of 1.5 g and an amount of filler of 4 g. The resulting mathematical model can be used as the basis for controlling the surface characteristics of paper during its production.

1. Petrusheva N. А., Аlashkevich Yu. D., Chistova N. G., Zaripov Z. Z. Expansion of the raw material base when using recycled pulp in the production of fibreboard. Problems of ecology and urban development. Krasnoyarsk, 2001, pp. 227–232 (in Russian).

2. Кuleshov А. V., Smolin А. С. Paper-forming properties of recycled plant fibers. Khimiya rastitel’nogo syr’ya = Chemistry of plant raw materials, 2008, no. 2, pp. 109–112 (in Russian).

3. Vurasko A.V., Galimova (Minakova) A. R., Driker B. N. Resource-saving technology for the production of cellulose in the processing of crop waste. Tsellyuloza. Bumaga. Karton [Cellulose. Paper. Cardboard], 2007, no. 1, pp. 16–19 (in Russian).

4. Babakhanova Kh. A., Galimova Z. K., Abdunazarov M. M. Use of pharmaceutical waste in paper industry of the Republic of Uzbekistan. Khimiya rastitel’nogo syr’ya = Chemistry of plant raw materials, 2020, no. 3, pp. 285–290 (in Russian). https://doi. org/10.14258/Jcprm.2020037298

5. Petrusheva N. А., Аlashkevich Yu. D., Chistova N. G. Mathematical model of the processing of recycled fiber in the production of fibreboard. Khimiya rastitel’nogo syr’ya = Chemistry of plant raw materials, 2002, no. 4, pp. 49–53 (in Russian).

6. Babakhanova Kh. A., Ismailov I. I., Sadriddinov А. А., Babakhanova M. A., Saidova D. Sh. Surface and Optical Properties of Calcium Carbonate Paper. Vestsi Natsyyanal’nai akademii navuk Belarusi. Seryya khimichnykh navuk = Proceedings of the National Academy of Sciences of Belarus, Chemical series, 2021, vol. 57, no. 4, pp. 473–480 (in Russian). https://doi.org/10.29235/1561-8331-2021-57-4-473-480

7. On additional measures to develop the fodder base of the silkworm in the sericulture industry. Decision of the President of the Republic of Uzbekistan № 4567 from 17.01.2020. Available at: https://lex.uz/docs/4456802 (in Russian).

8. Babakhanova Kh. A., Galimova Z. K., Abdunazarov M. M., Ismailov I. I. Properties of paper containing pulp from mulberry branches. Vysshaya shkola: nauchnye issledovaniya : Materialy Mezhvuzovskogo nauchnogo kongressa, Moskva, 30 aprelya 2020 goda [Graduate School: Scientific Research. Materials of the Interuniversity Scientific Congress, Moscow, April 30, 2020]. Moscow, Infiniti Publ., pp. 118–122 (in Russian).

9. Babakhanova Kh. A., Galimova Z. K., Abdunazarov M. M., Ismailov I. I. Texture of paper with the addition of cellulose pulp from the bark of mulberry tree branches. Khimiya rastitel’nogo syr’ya = Chemistry of plant raw materials, 2020, no. 4, pp. 261–266 (in Russian). https://doi.org/10.14258/jcrm.2020047761.

10. Babakhanova H. A., Galimova Z. K., Abdunazarov M. M., Ismailov I. I. Pulp mass from the bark of mulberry branches for the paper industry. Izvestiya vysshikh uchebnykh zavedeniy. Lesnoy zhurnal = Lesnoy Zhurnal (Russian Forestry Journal), 2020, no. 5, pp. 193–200 (in Russian). https://doi.org/10.37482/0536-1036-2020-5-193-200

11. Babakhanova Kh. A., Galimova Z. K., Sadriddinov А. А., Ismailov I. I. Study of the microgeometry of the surface of paper from the bark of mulberry branches. Lesnoy vestnik = Forestry bulletin, 2022, no. 1, pp. 84–90 (in Russian). https:// doi.org/10.18698/2542-1468-2022-1-84-90

12. Babakhanova Kh. A., Galimova Z. K., Abdunazarov M. M., Ismailov I. I. Study of ink perception of paper with the addition of pulp from the bark of mulberry branches. Lesnoy vestnik = Forestry bulletin, 2021, vol. 25, no. 5, pp. 97–105 (in Russian). https://doi.org/10.18698/2542-1468-2021-5-97-105

13. Mullina E. R., Мishurina О. А., Chuprova L. V., Ershova О. V. Influence of sizing compounds chemistry on hydrophilic and hydrophobic properties of cellulosic materials. Sovremennye problemy nauki i obrazovaniya = Modern problems of science and education, 2014, no. 6, pp. 250 (in Russian).

14. Оstapenko А. А., Moroz V. N., Barbash V. А., Коzhevnikov S. Yu., Dubovy V. К., Коverninskiy I. N. Improving the quality of paper from waste paper with chemical functional substances. Khimiya rastitel’nogo syr’ya = Chemistry of plant raw materials, 2012, no. 1, pp. 187–190 (in Russian).