RU2580742C2 - Composite material - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to polyethyleneterephthalate-based composite materials, intended for manufacturing monolayered containers in form of bottles. Composite material is obtained by modification of polyethyleneterephthalate with modifying composite.

EFFECT: invention possesses improved gas-barrier properties.

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Description

The invention relates to composite materials based on polyethylene terephthalate, intended for the manufacture of single-layer containers in the form of bottles with improved gas barrier properties.

Plastic polyethylene terephthalate (PET) packaging is an indispensable attribute of our life, which has become so familiar that we even stopped noticing it. Polyethylene terephthalate packaging surrounds us everywhere in everyday life: whether we cook, take a bath, clean the house — liquids are always present in PET containers. The popularity of PET packaging indicates the many advantages of the polymer, the scope of which includes the food, chemical, perfumery and pharmaceutical industries. Despite the many advantages, PET packaging has a significant drawback - relatively low gas barrier properties. It passes oxygen and carbon dioxide, which degrades the quality and shortens the shelf life of the product.

Known polyethylene terephthalate material and a method for its preparation, intended for the manufacture of beverage packaging (RF Patent No. 224996, IPC В29С 49/02, C08J 3/20). The specified material contains granulate PET (98.8-99.15 wt.%) And additionally a dye with the addition of a UV absorber (1.2-0.85 wt.%), While the granulate PET has a higher intrinsic viscosity of 0 80-0.84 dl / g, preferably 0.82 dl / g.

The material according to the patent for the invention was investigated by the degree to which the material transmits UV radiation depending on the wavelength, and graphical materials are presented that demonstrate the preservation of the taste of the packaged product over time. However, studies show that the degree of transmission of UV radiation by the material is quite large.

The closest in technical essence and the achieved effect to the proposed one is polyethylene terephthalate material and a method for producing it, intended for the manufacture of beverage packaging according to Japanese Patent Application No. 2003171539, authored by Fujimaki Takashi. This patent application provides a composition and method for producing a polyolefin-polyester-block copolymer composition for producing molded products. Composite material has in its composition a mixture containing (a) 100 mass. including saturated polyesters, (b) 5-100 mass. including polyolefin containing at least one carboxyl group in the molecule, (C) 1-15 mass. including uterine concentrate, consisting of 0-100 wt. % of compounds having two epoxy groups in the molecule and 100-0 wt. % of compounds having an average of at least 2.1 epoxy groups in the molecule as a binder, and 0.25-10 wt. % organic acid, as well as a metal salt used in the mother liquor as a catalyst. A significant drawback of this composition is the creation of such a complex system of uterine concentrate that is economically inexpedient.

The objective of the invention is the creation of polymeric composite materials based on polyethylene terephthalate, intended for the manufacture of single-layer containers, with improved gas barrier properties.

To solve the above problem, the present invention provides a composite material comprising polyethylene terephthalate (PET) and a modifying composite, in the following ratio, mass. %:

PAT 80-95 modifying composite 5-20

In turn, the modifying composite incorporates polypropylene and organoclay, in the following ratio, mass. %:

polypropylene 80 organoclay twenty

In the specified composite material, it is preferable to use polyethylene terephthalate (PET) granulate SPET 8200 grade L.

Montmorillonite of the Herpegezh deposit of the Kabardino-Balkarian Republic with a cation exchange capacity of 95 mEq / 100 g of clay, previously purified from ballast substances in hydrocyclone and modified with KATAPAV at a ratio of 1: 1, in the amount of 10% by weight of mantmorillonite, is used as organoclay. Moreover, the used KATAPAV has the general chemical formula:

As a polypropylene (PP) material in the masterbatch, PPG 1035-08 brand material is used.

The modifying composite is obtained by extrusion mixing polypropylene and organoclay at a temperature of 220 ° C.

The invention is illustrated by the following examples.

An example of obtaining a composite material.

Polyester and a modifying composite are sequentially loaded into a mixer heated to 40 ° C. The resulting powder mixture is poured into an extruder and processed in zones I-VI at temperatures of 235 ° C, 240 ° C, 250 ° C, 260 ° C, 270 ° C, 275 ° C, respectively.

In the process of obtaining composite material, standard laboratory equipment was used: a mixer, an extruder, and well-known methods of testing the obtained materials and the equipment corresponding for these purposes:

- permeability index of O ₂ cm ³ / m ² for 24 hours at 23 ° C;

- permeability indicator for CO ₂ cm ³ / m ² for 24 hours at 23 ° C;

- vapor permeability g / m ² for 24 hours at 90% relative humidity and a temperature of 38 ° C, measured in accordance with DIN 53380 T.2-ASTMD 1434-M.

The composition and properties of the composite material are shown in table 1 and 2.

EFFECT: obtaining a composite material based on polyethylene terephthalate having improved barrier properties — oxygen permeability of 22.3 cm ³ / m ² in 24 hours, CO ₂ permeability _of 10.4 cm ³ / m ² in 24 hours, vapor permeability of 13.5 cm ³ / m ² in 24 hours.

Claims (1)

A polymer composition based on polyethylene terephthalate for the manufacture of single-layer containers in the form of bottles, characterized in that it further comprises a modifying composite in the following ratio, mass. %:
PAT 80-95 modifying composite 5-20
used as a modifier modifying composite incorporates polypropylene and organoclay in the following ratio, mass. %:
polypropylene 80 organoclay twenty
moreover, the used organoclay is montmorillonite with a cation exchange capacity of 95 mEq / 100 g of clay, modified by KATAPAV at a ratio of 1: 1, in an amount of 10% by weight of montmorillonite.