PL155825B1 - Method for manufacturing shapes of sorted used thermoplastic waste containing up to 60 % of impurities not being thermoplastic polymers - Google Patents

Description

REPUBLIC POLAND PATENT DESCRIPTION 155 825 Additional patent to patent no. Reported: 88 06 27 (P. 273337) Priority Int. Cl. ⁵ B29B 17/00 C08J 11/00 READHIfl OFFICE PATENT RP Entry announced: 89 04 03 Patent specification published. ' 1993 06 30 ABOUT SÓLH

Creators of the invention: Włodzimierz Ciesielczyk, Jerzy Kapko, Stanisław Madej, Mieczysław Mrowieć, Elżbieta Nowakowska, Krzysztof Renc, Maacin Urban

The holder of the patent: Polieechnika Krakowska im. Tadeusz Kościuszko,

Cracow, Poland)

THE METHOD OF PRODUCING SHAPES FROM SORTED POSTPARTIC THERMOPLASTIC PLASTIC WASTE, CONTAINING UP TO 60% OF POLLUTION

NOT THERMOPLASTIC MATERIALS

The subject of the invention is a method of producing fittings from sorted post-consumer thermoplastic waste, containing up to 60% of non-thermoplastic impurities, which cannot be processed by conventional methods.

Due to the constantly increasing pollution of the human environment and the raw material and energy crisis, the re-use of all kinds of waste, in particular plastic waste, is becoming more and more important. From among the post-consumer plastic waste collected in landfills, only 70% of thermoplastic waste is processed using generally available methods after shredding, washing, drying and granulation. The remaining 30% of sorted waste containing thermoplastics and significant amounts of contaminants that are not thermoplastics is deposited on landfills, causing particularly troublesome environmental pollution, not only large urban agglomeeations and industrial districts, but even agricultural and tourist and recreational areas.

The methods of thermal pretreatment of thermoplastic industrial wastes and waste ^ y ^ (dc ^ t ^ y'tyih from municipal waste, known from the patent description PRL 117 139), allow them to be preplasticized in the crushing gap of a suitable device, in which the polymers are melted as a result of the pressures applied. and additional heating, and thus they are prepared for pressing. However, the application of this method requires the removal of contaminants such as thermosets, rubber waste, ^ in ^ rr ^^ th, meIz ^^ and wood, etc. from the processed waste. sorted from the landfill, still containing large amounts of pollutants, this method becomes less profitable due to the costs of this sorting.

155 825

155 825

The aim of the invention is to use sorted post-consumer thermoplastic waste without scrupulous removal of mechanical impurities from it, and to produce ready-made moldings in compression molds similar to those used in the processing of thermosets.

The method according to the invention consists in the fact that after removing from the contaminated waste only large-sized and difficult to grind foreign materials, such as metal, mineral, fibrous parts, etc., the waste is pre-shredded and then mixed and heated, preferably by means of a feeder. ), with a heated shell, to a temperature higher than the glass transition temperature of the thermoplastic polymer mixture, but lower than their melting point, and put into a compression mold, where they are subjected to a pressure of not less than 80 kg / cm. lower than the glass transition temperature of the thermoplastics contained in the mixture. Shaping in the method according to the invention is possible due to the joining of the polymer particles present in the mixture, which reach a semi-plastic state during the process.

The method according to the invention allows the use of hitherto unprocessed, burdensome waste for the production of useful products, and also contributes to the protection of the environment by reducing the surface of landfills.

Example. Targeted waste containing: 3.3% PA, æ, 3% PS, 8.2% PECio ^ a), 9.2% PP (foil), 14.7% PE (fittings), 19.4% PP (solids ), 19.6% PVC, 0.2% rubber, 2.9% other plastics, 1.1% other combustible materials, 13.4% other non-combustible materials, 1.7% methyl, ground to a particle size of 5 x 5 pp (in the case of films up to 15 x 15 pp) and then mixed with simultaneous movement in a screw conveyor heated to 150 ° C. The thus heated mixture was dosed directly from the screw conveyor to the compression mold placed on the table of the thermosetting plastic press and pressed at a pressure of 110 kg / cm for a period of 0.5 in. A shaped piece with a wall thickness of 7 mm was obtained. The mold and punch temperature was 75 * C.

Claims (2)

Pateno claims The method of producing fittings from sorted thermoplastic waste, containing up to 60% of non-thermoplastic impurities, by grinding, mixing, heating and pressing, characterized in that the pre-crushed, mixed and heated plastic waste is introduced into the mold pressure at a temperature higher than the glass transition temperature of the thermoplastic polymers present in the mixture of thermoplastic polymers but lower than their melting point, and then pressed under a pressure of not ϋ ^] 5 ^^ ρ than 80 SG / cp, with the mold and punch temperature being lower than glass transition temperature of thermoplastics. 2. The method according to p. The process of claim 1, characterized in that the mixing and heating of the waste is carried out in a screw conveyor with a heated jacket. Department of Publishing of the UP RP. Circulation of 90 copies