PL224438B1 - Use of coffee as a stabilizing compound the properties of polymeric materials - Google Patents

Description

The subject of the invention is a new use of coffee, in the form of a powder from an extract of roasted coffee beans, as a compound stabilizing the properties of polymer materials by introducing this additive into the matrix of the polymer material.

There are known from patents EP2358209, EP2412247, US6296889 methods of obtaining antioxidants from coffee intended for use in food products. However, in the processing of polymers, coffee or its derivatives were not used as an antioxidant. Polymers, depending on their chemical structure, method of preparation, modifying additives and external factors, differ significantly in resistance to aging processes, especially oxidation. Therefore, most of them require the use of stabilizing substances to extend their service life. Stabilizing compounds commonly used are phenolic compounds (e.g. Irganox 1330 or Alvinox 100), amines (e.g. Cyanosorb UV-3853-S), phosphorus compounds (e.g. Irgafos TNPP) and sulfur compounds (e.g. Cyanox STDP or Irganox PS802). Antioxidants should (i) be non-volatile so as not to migrate to the surface during use of the polymer product, (ii) be miscible with the polymer, (iii) have good thermal stability, (iv) be non-toxic, especially as additives used in food packaging , and (v) be relatively cheap. Coffee meets all these requirements, especially in the form of a powdered extract of roasted coffee beans.

The essence of the invention is the use of coffee, in the form of a powder from an extract of roasted coffee beans, as an antioxidant of polymers by introducing this additive into the matrix of the polymeric material. The roasted coffee bean extract in powder form is mechanically mixed in an amount of up to 3% by weight. with a granulate of the polymeric material, and then this mixture is extruded, cast or injected into a mold. The roasted grain extract in powder form can also be mechanically blended in an amount of up to 3% by weight. with a hardenable polymer resin. Preferably, the coffee extract in powder form is mixed in an amount of 0.1 to 0.5 wt.%. with granules of polymeric material and then extruded, cast or injected into the mold. It is also advantageous to use a thermoplastic with a processing temperature below 220 ° C.

Example: Mixtures of acrylonitrile-butadiene-styrene (ABS) copolymer of Terluran GP-35 Natural type (Styrolution GmbH, Germany) with a powdered extract of roasted coffee beans (100% natural Nescafe coffee, Poland) were prepared in an amount of 0, 1; 0.3 and 0.5 wt.% These ingredients were dried at the temperature of 90 ° C for 24 hours and then mechanically mixed. The mixtures prepared in this way were extruded using a single-screw extruder with a cylinder diameter of 25 mm and a screw length to diameter ratio (L / D) equal to 25, while maintaining the following temperature values in individual heating zones of the extruder: cylinder zone I 170 ° C, zone II cylinder 180 ° C, cylinder zone III 190 ° C, extruder head 190 ° C. The extruded coffee-containing granules were dried at 90 ° C for 5 hours, and then bars and paddles were made by injection method for further testing. The samples were subjected to the accelerated aging procedure, consisting of UV-Vis irradiation in a SunSet CPS + chamber (Atlas, Germany) for 8 hours, then they were heated at 150 ° C for 8 hours, and in the last step they were soaked in an aqueous salt solution of 50 ° C for 8 hours. These three stages constituted one cycle of accelerated aging. The samples were subjected to 6, 12 and 24 such cycles. Moreover, the samples were thermo-oxidized in an oxygen atmosphere at the temperature of 150 ° C and the time of induction of oxidation of the tested samples was determined. The dependence of the oxidation induction time (OIT) of samples with different content of coffee extract, and the relative change in absorbance of samples with different content of coffee extract are shown

Claims (5)

Patent claims 1. The use of coffee, in the form of a powder from an extract of roasted coffee beans, as a compound stabilizing the properties of polymers by introducing this additive into the matrix of the polymeric material. 2. The use according to claim 1 A method as claimed in claim 1, characterized in that the roasted coffee bean extract in powder form is mechanically mixed in an amount of up to 3% by weight with the granules of the polymeric material, and the mixture is then extruded, poured or injected into a mold. PL 224 438 B1 3. Use according to claim 1 A method as claimed in claim 1 or 2, characterized in that the roasted coffee bean extract in powder form is mechanically mixed in an amount of up to 3% by weight with a curable polymer resin. 4. Use according to claim 1 according to any one of claims 1 to 3, characterized in that the coffee extract in powder form is mixed in an amount of 0.1 to 0.5% by weight. 5. Use according to claim 1 3. The process as claimed in any one of the preceding claims, characterized in that the polymer granulate is a thermoplastic material with a processing temperature below 220 ° C. Drawings Cross out. The dependence of the oxidation induction time (OiT) of ABS samples with different content of coffee extract i (o «e iykh try» » Graph 2. Relative change in absorbance of ABS samples with different content of coffee extract