SU506604A1 - Polymer composition - Google Patents

Description

one

The invention relates to the technology of production and processing of polymeric materials used in the field of agricultural production (hoses, pipes, coatings for greenhouses, etc.). In various sectors of industry and agriculture, pipelines made from polyethylene of various densities have been widely distributed. But polyethylene pipelines have a low service life due to increased atmospheric and soil humidity and temperature differences.

Polymer compositions of polyethylene-based polyethylene are known, containing aromatic amines as a stabilizing additive, for example, diphenyl-β-phenylenediamine (diafen HH). The high toxicity of stabilizing additives worsens the sanitary and hygienic working conditions and limits their scope of use (contact with drinking water and food is prohibited). In addition, pipelines of stabilized polyethylene used for process water have high moisture permeability and vapor permeability, which degrades their physicomechanical properties when exposed to temperature changes and microbiological corrosion.

In order to develop such a composition of stabilized polyethylene, which, being used, for example, for the manufacture of pipelines, provides an increase in the resistance of products to microbiological destruction, a decrease in moisture vapor permeability and stability of physical and mechanical properties, a polymer composition containing polyethylene is proposed, and as a stabilizing additive, diamine dioleate is used the following ratio of components, weight. %: Polyethylene 99,00-99,95

Stabilizer0.05-1.00

To obtain a stabilizing additive, n-ethylene polyamine is used in a mixture with an acid in the following ratio, wt. %: Polyethylenepolyamine 0.6-0.8

Oleioic acid1,4-1,2

The stabilizing additive is non-toxic, its use meets sanitary and hygienic requirements and manufacturability. Polyethylene products made according to the proposed composition have increased hydrophobicity, low moisture-vapor permeability, stability of physical and mechanical properties when exposed to temperature changes, resistance to microbiological

corrosion. The softening temperature of the product is I-5 ° C below standard materials. The permeability of films in relation to polar gases decreases. Polyethylene sleeves are made by extrusion through a flat and

ring head. The temperature of the extrusion regime in stabilized polyethylene decreases slightly (by 2-3 ° C), the relative elongation at break "lowered by 10%.

The proposed composition reduces the water vapor permeability compared with the prototype by 10-30%, which can be seen from the table. one.

Table 1

(Experimental conditions: 100% relative air humidity, 25 ° С)

The physicochemical stability of polymers is closely related to water permeability. The permeability of materials was radiated by the penetration of water. In the experiments, the cup method was used.

The test results on the rolls confirmed the positive effect of the antioxidant stabilizer on the prolongation of the retention of the physicomechanical properties of polyethylene. Low pressure polyethylene was used in the experiments. Polyethylene samples (in 5-fold repetition) were placed on the day in cuvettes with soil (with 80% soil moisture), pH - 4.7) at 20 ° С, then the cuvettes were transferred to a “cold chamber (-10 ° С ).

Samples of stabilized polyethylene survived the number of cycles of alternate freezing and thawing without destruction by 70–90% more than those that were not stabilized. The change in the physical and mechanical properties of polyethylene during soil and atmospheric aging near Vilnius is given in Table. 2

table 2