RESEARCH OF THE PROPERTIES OF HIGHLY FILLED FILM MATERIALS BASED ON POLYOLEFINS
DOI:
https://doi.org/10.30857/2786-5371.2022.6.10Keywords:
polyolefins, mineral filler, highly filled film materials, mechanical properties, blown filmsAbstract
Purpose. Determination of the influence of the content of the filler concentrate, its moisture content and the nature of the polymer base on the properties of blown films based on various types of polyethylene.
Methodology. The mechanical properties of the test samples – tensile yield strength, strength and relative elongation at break – were determined using a P5 laboratory tearing machine according to ISO 527-2:2012. The density of film samples was determined by hydrostatic weighing using Radwag AS2 analytical weights.
Findings. The influence of filler content in the form of concentrates based on primary and secondary polyethylene on the physical and mechanical properties of blown films based on LDPE and LLDPE was studied. Introduction of up to mass 20% of the conditioned concentrate of the filler in virgin polyethylene leads to a decrease in tensile strength by 17% for LDPE and 13% for LLDPE, respectively, and when using a conditioned concentrate based on recycled polyethylene – by 11% and 5%, respectively. In case of introduction of 40% filler the tensile strength of the conditioned filler concentrate is reduced by 30% for LDPE, and by 20% for LLDPE. The introduction of the filler, carried out with the help of a concentrate on virgin and recycled raw materials, did not reveal a significant difference in the set of mechanical characteristics, which allows the use of recycled polyethylene as a basis for obtaining filler concentrates.
The influence of the equilibrium moisture content of the filler concentrate on the properties of film materials was investigated. With the introduction of 40% filler concentrate based on recycled polyethylene with an equilibrium moisture content of 0.12% in LDPE, the value of relative elongation decreases by 52%, and in the case of a dried concentrate with a moisture content of 0.05% – only by 22%.
Originality. The influence of the filler content based on recycled polyethylene on the properties of film materials was established.
Practical value. The possibility of application of recycled raw materials to create filler concentrates in the production of highly filled packaging films is shown.
