Abstract

Introduction. Processing agricultural waste into plant biodegradable plastics is a promising way for its recycling. This work featured the main physical-and-mechanical properties of plant plastics without adhesive substances obtained from millet husk and wheat husk and wood plastic obtained from sawdust, as well as their biodegradation potential.
Study objects and methods. Objects of the study were plastics without adhesives based on wood sawdust, millet husk, and wheat husk.
Results and discussion. We analyzed of the physical-and-mechanical parameters of the plant plastic based on millet husk, wheat husk, as well as wood plastic based on sawdust. The analysis showed that, in general, the strength characteristics of the wood plastics were higher than those of the plastics based on millet husk, especially flexural strength. Thus, the average value of the density of the wood plastic exceeded that of the plant plastic from millet husk by 10%, hardness by 40%, compression elasticity modulus by 50%, and flexural modulus by 3.9 times. It was found that wood and plant plastics obtained from sawdust, millet husk, and wheat husk without adhesives had a high biodegradation potential.
Conclusion. The plastics obtained can be used as an insulating, building, and decorative material in the steppe regions experiencing a shortage of wood and wood powder.

Keywords

Plastic, agricultural waste, grain, husk, biodegradation

REFERENCES

1. Moreira AA, Mali S, Yamashita F, Bilck AP, de Paula MT, Merci A, et al. Biodegradable plastic designed to improve the soil quality and microbiological activity. Polymer Degradation and Stability. 2018;158:52–63. DOI: https://doi.org/10.1016/j.polymdegradstab.2018.10.023.
2. Briassoulis D, Mistriotis A, Mortier N, Tosin M. A horizontal test method for biodegradation in soil of bio-based and conventional plastics and lubricants. Journal of Cleaner Production. 2020;242. DOI: https://doi.org/10.1016/j.jclepro.2019.118392.
3. De Lucia C, Pazienza P. Market-based tools for a plastic waste reduction policy in agriculture: A case study in the south of Italy. Journal of Environmental Management. 2019;250. DOI: https://doi.org/10.1016/j.jenvman.2019.109468.
4. Zemnukhova LA, Budaeva VV, Fedorishcheva GA, Kaydalova TI, Kurilenko LN, Shkorina ED, et al. Inorganic components of straw and hull of an oats. Chemistry of plant raw material. 2009;(1):147–152. (In Russ.).
5. Budaeva VV, Zolotukhin VN, Mitrofanov RYu. Creation of database on agricultural waste. Materialy 5 Mezhdunarodnoy konferentsii “Sotrudnichestvo dlya resheniya problemy otkhodov” [Materials of the 5th International Conference “Waste management: Cooperation”]; 2008; Kharkiv. Kharkiv: Kharkiv Polytechnic Institute; 2008.
6. Kocheva LS, Brovarova OV, Sekushin NA, Karmanov AP, Kuzmin DV. Structural-and-chemical characteristic of non-wood pulp types. Bulletin of Higher Educational Institutions. Lesnoy zhurnal (Forestry Journal). 2005;(5):86–93. (In Russ.).
7. Vurasko AV, Driker BN, Galimova AR. Savings-resourse process of waste of agricultural cultures. Lesnoy Vestnik. Forestry Bulletin. 2007;(8):140–143. (In Russ.).
8. Zhang X, You S, Tian Y, Li J. Comparison of plastic film, biodegradable paper and bio-based film mulching for summer tomato production: Soil properties, plant growth, fruit yield and fruit quality. Scientia Horticulturae. 2019;249:38–48. DOI: https://doi.org/10.1016/j.scienta.2019.01.037.
9. Pathak S, Saxena P, Ray AK, Grobmann H, Kleinert R. Irradiation based clean and energy efficient thermochemical conversion of biowaste into paper. Journal of Cleaner Production. 2019;233:893–902. DOI: https://doi.org/10.1016/j.jclepro.2019.06.042.
10. Faruk O, Bledzki AK, Fink H-P, Sain M. Biocomposites reinforced with natural fibers: 2000–2010. Progress in Polymer Science. 2012l37(11):1552–1596. DOI: https://doi.org/10.1016/j.progpolymsci.2012.04.003.
11. Shen L, Haufe J, Patel MK. Product overview and market projection of emerging bio-based plastics. Netherlands: University Utrecht; 2009. 243 p.
12. Galyavetdinov NR, Safin RR. Upakovochnye materialy na osnove polilaktida i drevesnogo napolnitelya [Packaging materials based on polylactide and wood filler]. Kazan: Kazan National Research Technological University; 2017. 124 p. (In Russ.).
13. Satyanarayana KG, Arizaga GGC, Wypych F. Biodegradable composites based on lignocellulosic fibers – An overview. Progress in Polymer Science 2009;34(9):982–1021. DOI: https://doi.org/10.1016/j.progpolymsci.2008.12.002.
14. de Oliveira TA, Mota ID, Mousinho FEP, Barbosa R, de Carvalho LH, Alves TS. Biodegradation of mulch films from poly(butylene adipate co-terephthalate), carnauba wax, and sugarcane residue. Journal of Applied Polymer Science. 2019;136(47). DOI: https://doi.org/10.1002/app.48240.
15. Pekhtasheva EL, Neverov AN, Zaikov GE. Biotsidy i biorazlozhenie organicheskikh i neorganicheskikh materialov. Biopovrezhdeniya i zashchita [Biocides and biodegradation of organic and inorganic materials. Biodeterioration and protection]. Saarbrucken: LAP LAMBERT; 2012. 120 p. (In Russ.).
16. Zaikov GE, Pekhtasheva EL, Neverov AN. Biodestruktsiya i stabilizatsiya prirodnykh polimernykh materialov [Biodegradation and stabilization of natural polymeric materials]. Saarbrucken: LAP LAMBERT; 2012. 256 p. (In Russ.).
17. Picuno C, Alassali A, Sundermann M, Godosi Z, Picuno P, Kuchta K. Decontamination and recycling of agrochemical plastic packaging waste. Journal of Hazardous Materials. 2020;381. DOI: https://doi.org/10.1016/j.jhazmat.2019.120965.
18. Serrano-Ruíz H, Martín-Closas L, Pelacho AM. Application of an in vitro plant ecotoxicity test to unused biodegradable mulches. Polymer Degradation and Stability. 2018;158:102–110. DOI: https://doi.org/10.1016/j.polymdegradstab.2018.10.016.