22 results about "Polymer waste" patented technology

The invention relates to the technical field of polymer waste recycling, and discloses a device and method for preparing methyl methacrylate through continuous regeneration of waste acrylic, and the device comprises a two-stage reaction and feeding system, a molten salt online regeneration and energy management system, and a gas-phase product active purification and collection system. The method comprises the following steps: in the first-stage flash evaporation depolymerization cavity, the waste acrylic is in direct contact with high-temperature molten salt to realize rapid flash evaporation depolymerization; finishing the finishing reaction in a secondary molten salt cracking reactor and stripping the product through inert gas; the gas product is subjected to quenching separation and collection after being purified by high-temperature plasma; and the reacted molten salt is subjected to filtering purification, thermoelectric conversion energy recovery and reheating, and then is circulated back to the first-stage reaction cavity. According to the invention, the problems of low heat transfer efficiency, more side reactions, and difficulty in continuous and stable production due to easy inactivation of the medium in the traditional thermal cracking process are solved, the efficient and continuous production process is realized, and the yield and the product quality of methyl methacrylate are improved.

A process for recycling a stream of polyester waste material by depolymerising the polyester by alcoholysis, includes first and second consecutive stages of depolymerisation, in which the polymer waste material is subjected in a continuous manner, in the first stage, the polyester waste material is continuously fed to an extruder operated at a temperature above the polyester melting temperature, while a first amount of alcohol is co-fed to the extruder, to produce a fluid mixture including a melt of the at least partly depolymerised polyester, and in the second stage, the fluid mixture is continuously fed to a continuously stirred tank reactor (CSTR) operated at a temperature above the polyester melting temperature, while co-feeding a second amount of alcohol to the CSTR, a residence time in the CSTR being used to provide at the CSTR outlet a continuous stream of polyester depolymerised into an oligomeric ester.

The present disclosure relates to methods of separating flame retardants from styrene polymers in styrene polymer waste. The method comprises combining the styrene polymer waste with a solvent to obtain a soluble fraction and an insoluble fraction, separating the soluble and insoluble fractions, and the flame retardant is substantially in the soluble fraction and the styrene polymer is substantially in the insoluble fraction or vice versa.

The present disclosure relates to methods of recovering flame retardant from a styrenic polymer waste.

The present invention relates to a method suitable for recycling mixed polymer waste material, wherein the waste material comprises polyurethane (PUR) elements and dye-containing polyester elements mechanically bonded to these polyurethane elements, and the method comprises a series of steps including: dispersing the mixed polymer waste material in 2-(2-ethoxyethoxy)ethanol (DGME); leaving the polymer waste material dispersed in the DGME until at least a portion of the dye is extracted from the polyester into the DGME and at least 90% (w / w) of the PUR elements are dissolved in the DGME; separating the polyester elements from the DGME containing at least a portion of the dye and dissolved PUR elements; and reusing the polyester to manufacture a new product.

The present invention relates to a method for recovering and recycling disperse dyes from colored polymer wastes having an ester functional group and, more specifically, to a method for recovering and recycling disperse dyes from colored polymer wastes having an ester functional group, wherein the disperse dyes are extracted by color from the polymer wastes having an ester functional group by using a first compound, and the disperse dyes extracted by color are colored on polymer fabrics having an ester functional group.

A polymer modification method comprises: (a) contacting a polymer with at least one carboxylic acid selected from C2-C40 aliphatic, aromatic, or cyclic acids; (b) introducing free radicals via thermal, photochemical, or chemical decomposition; (c) adding at least one nitrogen compound; and (d) optionally incorporating a metallocene catalyst. The method enhances polymer properties (tensile strength, elongation, impact resistance) by 25-250%, reduces energy consumption 20-45% compared to virgin production, and enables processing of mixed polymer wastes. Applications include automotive components (20-40% recycled content), food-grade packaging (up to 35% recycled HOPE), construction materials, and waste valorization. The predictive radical chemistry enables controlled property enhancement through mathematical correlation between radical concentration, reaction kinetics, and polymer modification degree.

According to an example aspect of the present invention, there is provided a system (1) comprising a hollow chamber (2) comprising a first chamber (3) and a second chamber (4), wherein the second chamber (4) is rotatable or the first chamber (3) and the second chamber (4) are rotatable, a heating system (19) configured to heat the second chamber (4) or to individually heat the first chamber (3) and the second chamber (4), a lance (5) having at least one feed outlet (6), wherein the lance (5) extends within the hollow chamber (2) at least through the first chamber (3), and wherein the system (1) is configured to feed polymer waste (7) into the second chamber (4) via the at least one feed outlet (6), at least one injector (21) capable of injecting at least one sweep fluid into the first chamber (3) or into the first chamber (3) and into the second chamber (4) in order to form a fluid flow towards at least one gas outlet (20) for collecting a product (13) comprising the at least one sweep fluid and a gas (22) from at least partially pyrolyzed polymer waste.

A recycling composition comprising a polymer waste stream having an amount of low molecular weight polyolefin ranging from about 10 weight percent (wt.%) to about100 wt.% based on the total amount of polymer in the polymer waste stream, wherein the low molecular weight polyolefin has a number average molecular weight (Mn) of less than 10,000 g / mol. A method comprising contacting a polymer waste stream having an amount of low molecular weight polyolefin ranging from about 10 weight percent (wt.%) to about100 wt.% based on the total amount of polymer in the polymer waste stream with a chain scission agent to form a reacted mixture; and conducting advanced recycling with the reacted mixture wherein the low molecular weight polyolefin has number average molecular weight (Mn) of less than 10,000 g / mol.

The following generally relates to recycling polymer waste materials, and more particularly to selecting a solvent, or solvent mixture, to be used to separate polymers from a polymer waste material as pail of a recycling process. For example, if a polymer waste material including multiple individual polymers is not first separated into individual polymers, the recycling process may not produce a useful product. In some embodiments, one or more processors determine a solvent composition and temperature to use the solvent composition at to separate individual polymers out of the polymer waste material.

Disclosed herein are laminate compositions comprising a plurality of fibres, triboelectric generators comprising generators comprising said laminate compositions, substrates and articles comprising said laminate compositions or triboelectric generators. Also disclosed herein are methods of manufacturing the laminate compositions, and uses thereof for electricity generation.

The present invention relates to a process suitable for recovering mixed polymer waste comprising a polyurethane (PUR) article, and a dye-containing polyester article mechanically attached to said polyurethane article, the process comprising the following consecutive steps: dispersing the mixed polymer waste in 2-(2-ethoxyethoxy) ethanol (DGME), the method comprises the steps of providing a DGME containing a dye and a PUR article, then allowing the polymer waste to remain dispersed in the DGME until at least a portion of the dye is extracted from the polyester into the DGME and at least 90% (w / w) of the PUR article is dissolved in the DGME, separating the polyester article from the DGME containing the at least a portion of the dye and the dissolved PUR article, and finally reusing the polyester to produce a new product.

A method for producing hydrocarbons from polymer waste includes: A) heating pre-crushed polymer waste in the presence of a mixture of liquid hydrocarbons to a temperature sufficient to convert at least one target polymer from the polymer waste to solution, but a lower transition temperature to solution for the remaining components of the polymer waste, to produce a polymer-containing mixture including a solution of at least one target polymer in the liquid hydrocarbon mixture, and B) catalytic cracking of the polymer-containing mixture in the presence of an ultrafine catalyst at a temperature from at least 360° C. to produce a mixture of liquid and gaseous hydrocarbons.

A self-contained recycling and additive manufacturing apparatus that transforms discarded polymeric waste into new three-dimensional (3D) printed objects. The apparatus includes a housing containing a waste intake and sorting assembly with a receptacle bin, shredder, and separator for preprocessing recyclable materials. A grinding and melting subsystem mechanically reduces and thermally melts the sorted waste, and an extruder converts the molten polymer into continuous filament for 3D printing. A digital control interface featuring a display panel, selectable 3D model options, and status indicator lights enables intuitive operation and real-time monitoring. A printing chamber enclosed by a transparent pivotable lid houses a movable build platform and print head assembly for layer-by-layer fabrication. The system is powered by a rechargeable battery, enabling portable and off-grid operation.

Disclosed are a method for recycling polymer waste, a polymer polyol prepared by the method, and a polyurethane prepared from the polymer polyol and a polyisocyanate.

Disclosed is a multi-stage continuous pyrolysis reactor using molten salt, and more specifically to a multi-stage continuous pyrolysis reactor that thermally decomposes polymer waste, such as waste plastics, under anaerobic or oxygen-deficient conditions. The multi-stage continuous pyrolysis reactor using molten salt according to the present invention comprises: a reactor body (100), a multi-stage pyrolysis furnace (200), a drive sprocket (330), a driven sprocket (340), a chain (350), a plurality of transport members (360), and a molten salt circulation unit (400).

The invention discloses a polymer composite modifier as well as a preparation method and application thereof, and relates to the field of asphalt preparation. Comprising the following components: polyethylene waste, polyurethane waste, waste SEBS, polystyrene waste, polyester waste, butyl rubber waste, butadiene styrene rubber waste, polyphthalamide and waste polystyrene. The preparation method comprises the following steps: uniformly stirring the components according to the ratio to obtain a preliminarily mixed material; the mixed material is crushed after being circularly ground for multiple times; and freezing the crushed material, and grinding to obtain the compound modifier. The polymer composite modifier is applied to preparation of asphalt for roads. According to the invention, the multi-source polymer waste with complex components is converted into a modifier product with uniform performance, high efficiency and high added value, and the modifier is applied to the preparation of the asphalt for the road, so that multiple targets of high performance, low cost, energy conservation, environmental protection and simplicity and convenience in operation are achieved.

The invention discloses an epoxy resin-based composite material based on a waste polyurethane foam degradation product and a preparation method of the epoxy resin-based composite material. The method comprises the following steps: (1) mixing waste polyurethane foam with ethanolamine under the protection of nitrogen, controlling the reaction temperature and time until the waste polyurethane foam is completely degraded, and performing reduced pressure distillation and purification to obtain a degradation product; and (2) carrying out ring-opening reaction on the degradation product and epoxy chloropropane under the action of a catalyst, then carrying out step-by-step alkali treatment to realize ring-closing epoxidation, and finally purifying to obtain the renewable epoxy resin, and (3) carrying out hot press molding on the bamboo fiber felt, waste polyurethane-based epoxy resin and a curing agent to obtain the bamboo fiber reinforced polyurethane-based resin composite material. According to the invention, high-valued utilization of waste polyurethane foam is realized, the obtained epoxy resin has the characteristic of environmental friendliness, the product has excellent comprehensive performance, and has equivalent mechanical properties with a commercial bisphenol A epoxy resin composite material, and a new thought is provided for recycling of polymer wastes.

In one embodiment, a method for processing polymeric waste materials into one or more products included: pyrolyzing a solid polymeric waste material, wherein the pyrolyzing includes: heating the solid polymeric waste material in the absence of oxygen to a temperature of 725 °F to 850 °F for a duration of 15 to 90 minutes; and thermochemically converting, in response to the heating step, at least some of the solid polymeric waste material into a first liquid product; separating the first liquid product from residual solids; separating a vapor stream from the vessel; and condensing at least a portion of the vapor stream into a second liquid product.

The invention discloses an environment-friendly adhesive based on degradable thermoplastic polyurethane and a preparation method of plywood of the environment-friendly adhesive. The method comprises the following specific steps: (1) degradation reaction: mixing waste thermoplastic polyurethane with ethylene glycol by using sodium hydroxide as a catalyst, and degrading to obtain a degradation product; (2) preparation of adhesive matrix resin: mixing the degradation product with methacrylic anhydride, and adding a polymerization inhibitor and a catalyst for reaction to prepare the adhesive matrix resin; and (3) preparing the plywood, namely uniformly mixing the adhesive matrix resin and the tert-butyl peroxybenzoate initiator, coating the upper surface and the lower surface of the dried plywood core veneer with the mixture, and carrying out manual paving and compression molding to obtain the plywood. According to the invention, high-value utilization of waste thermoplastic polyurethane is realized, the raw materials of the obtained adhesive are environment-friendly, rigid chain segments and active groups in the molecular structure endow the product with excellent mechanical properties and bonding strength, and a new technical scheme is provided for recycling of polymer wastes.

Disclosed are methods, compositions, and systems for recycling Automotive Shredder Residue (ASR) and post-consumer mixed polymer waste into specification-controlled thermoplastics and molded articles. In certain embodiments, a metal-reduced feed is density-separated to recover a light plastic fraction that is shredded, air-handled, and friction-cleaned to remove moisture, fines, paper, elastomers, and adhered residues. The cleaned fraction is extruded through a screen- changed melt-filtration zone and vacuum-devolatilized, with condensed vapors collected for environmental treatment. During extrusion, one or more coupling agents selected from organic titanates, zirconates, and aluminates are dosed to reactively compatibilize dissimilar polymers and promote adhesion to fillers. Also disclosed is a compatibilized thermoplastic composition comprising PE / PP blends whose interfacial regions include reaction products of the coupling agents and fillers bearing monomolecular coupling-agent layers, and a system integrating flotation, size-reduction, air handling, friction separation, melt filtration, devolatilization with environmental controls, a vented compounding extruder with feeders, and a downstream subsystem with heated accumulator(s) and selectable outlets to a molding press or pelletizer.