Method for obtaining a recycled material from multilayer pet containers and recycled material obtained using same
A method for obtaining mechanically recoverable recycled material from multilayer PET (polyethylene terephthalate) containers of post-consumer and/or post-industrial origin involves cleaning the containers, crushing them into pieces, mixing the pieces with a compatibilizing mixture and melting the mixed product to obtain a continuous filament. The compatibilising mixture is formed by at least: 10-45% thermoplastic polyolefin matrix; a reagent of plant origin in a percentage of less than 7.5% of the total mixture; and a rosin-based tackifier in a percentage of less than 7.5% of the total mixture.
1 . A method for obtaining a recycled material from multilayer PET containers of post-consumer and/or post-industrial origin, comprising the steps of:
cleaning the multilayer PET containers using a soapy solution,
separating film and/or labels from the multilayer PET containers, obtaining a clean multilayer PET material,
crushing the clean multilayer PET material into pieces having a size of at least 1 mm,
mixing the clean crushed multilayer PET material in a percentage of 50% to 85% of a total mixture, with a compatibilising mixture formed by at least a thermoplastic polyolefin matrix in a percentage of between 10% and 45% of the total mixture, a reagent of plant origin in a percentage of less than 7.5% of the total mixture, and a rosin-based tackifier in a percentage of less than 7.5% of the total mixture, and
melting the mixture obtained in the preceding step by means of extrusion at a temperature of between 270° C. and 300° C. to obtain a continuous filament.
2 . The method for obtaining a recycled material from multilayer PET containers according to claim 1 , wherein the cleaning step is performed by means of mechanical stirring, at a temperature of at least 60° C. and wherein the soapy solution is formed by an aqueous solution with 2% soap, the soap being formed by 15% anionic surfactants and 5% non-ionic surfactants.
3 . The method for obtaining a recycled material from multilayer PET containers according to claim 1 , wherein in the crushing step the clean crushed multilayer PET material is obtained in the form of flakes with a size smaller than 5 mm by 5 mm.
4 . The method for obtaining a recycled material from multilayer PET containers according to claim 1 , further comprising the step of cutting by means of a pellet press to section the continuous filament obtained in the melting step, resulting in thermoplastic chippings.
5 . The method for obtaining a recycled material from multilayer PET containers according to claim 1 , further comprising a moulding step involving modelling of the continuous filament obtained in the melting step by means of a nozzle having a configuration such that it allows obtaining thermoplastic sheets and/or profiles.
6 . A recycled material obtained from the method according to claim 1 , wherein the recycled material is formed by clean crushed multilayer PET material in a percentage of 50% to 85% of the total mixture and a compatibilising mixture formed by at least a thermoplastic polyolefin matrix in a percentage of between 10% and 45% of the total mixture, a reagent of plant origin in a percentage of less than 7.5% of the total mixture, and a rosin-based tackifier in a percentage of less than 7.5% of the total mixture.
7 . The recycled material according to claim 6 , wherein the thermoplastic polyolefin matrix is made up of polyethylene and/or polypropylene.
8 . The recycled material according to claim 6 , wherein the thermoplastic polyolefin matrix is made up of copolymers of ionomers, ethylene-vinyl acetate, or random copolymers of polypropylene.
9 . The recycled material according to claim 6 , wherein the reagent of plant origin is an epoxidised soybean oil, an epoxidised linseed oil, and/or a maleinised linseed oil.
10 . The recycled material according to claim 6 , wherein the recycled material is in a format of thermoplastic chippings.
11 . The recycled material according to claim 6 , wherein the recycled material is in a format of thermoplastic sheets or profiles.