206 results about "Melt mixing" patented technology

The invention discloses a high-toughness PPR pipe machining device which comprises an extrusion system, a pulsation mixing system, a melt online monitoring device, a sizing cooling system, a traction device and a winding device. The extrusion system is used for melting and conveying raw materials, and the pulsation mixing system is used for deeply mixing a melt by utilizing a periodic disturbance structure, so that a toughening agent and a copolymerization component are more uniformly dispersed in the melt. The melt on-line monitoring device can detect the temperature, pressure and dispersity of the melt in real time, so that the extrusion process is monitorable. The sizing cooling system adopts a subsection cooling mode of rapid cooling, constant-temperature slow release and low-temperature shaping, and stable shape control is achieved through vacuum sizing. The traction device and the winding device are used for keeping the production rhythm stable and achieving continuous winding of the formed pipe. According to the invention, the melt mixing quality can be improved, the cooling internal stress is reduced, and the toughness and dimensional stability of the PPR pipe are improved.

The invention relates to a corrosion-resistant polypropylene modified plastic and a preparation method thereof, and belongs to the technical field of polypropylene plastic modification. The modified plastic is prepared from isotactic polypropylene, exfoliated montmorillonite, polyvinylidene fluoride powder, anhydride grafted polypropylene, a beta-crystal nucleating agent, diethyl aluminum chloride, peroxide, hindered phenol, phosphite ester and N, N-distearoyl hydroxylamine. The preparation method comprises the steps of low-shear melting and blending, high-shear supercritical COviscosity reduction, vacuum exhaust, bidirectional orientation, infrared local crosslinking, co-extrusion cooling and the like. The obtained material is excellent in tensile strength, elongation at break, low-temperature impact strength, strong acid corrosion resistance and the like.

The invention discloses a preparation method of a mute tube core layer and a mute tube. The preparation method comprises the following steps: step 01, adding 15-55 parts by weight of polypropylene resin, 0.5-10 parts by weight of a coupling agent, 0.5-5 parts by weight of a lubricant, 0.05-1 part by weight of an antioxidant and 0.1-3 parts by weight of other additives into a twin-screw extruder from a main feeding port of the twin-screw extruder, and melting and mixing to form an intermediate melt; 02, 45-85 parts by weight of barium sulfate is added into a double-screw extruder through at least two side feeding ports of the double-screw extruder, the barium sulfate and the intermediate melt are subjected to melt blending, and a blended melt is formed; and step 03, extruding the blended melt by a twin-screw extruder, and sequentially passing through a melt pump and a pipeline core mold to form the pipe core of the mute pipe. According to the preparation method, the filling proportion of barium sulfate is increased to 70% or above, the material density is larger than 2.4 g / cm < 3 >, and the noise test of a drainage pipe system of the mute pipe prepared through the preparation method is smaller than 20 dB.

A process for preparing a fiber reinforced thermoplastic is disclosed. The process includes melting a first thermoplastic and a second thermoplastic in a melting zone of a twin-screw processor, feeding at least one continuous fiber downstream of the melting zone into a melted mixture of the first thermoplastic and the second thermoplastic, incorporating the at least one continuous fiber into the melted mixture in a mixing zone, the mixing zone including at least one wave element having a continuous outer surface in the form of a helical wave, and obtaining the fiber reinforced thermoplastic from the twin screw processor. Further, a fiber reinforced thermoplastic composition prepared by an extrusion process the composition having a density between 1.3 g / cc to 1.7 g / cc and a flexural modulus of at least 4000 MPa is disclosed.

A process for preparing a fiber reinforced thermoplastic is disclosed. The process includes melting a first thermoplastic and a second thermoplastic in a melting zone of a twin-screw processor, feeding at least one continuous fiber downstream of the melting zone into a melted mixture of the first thermoplastic and the second thermoplastic, incorporating the at least one continuous fiber into the melted mixture in a mixing zone, the mixing zone including at least one wave element having a continuous outer surface in the form of a helical wave, and obtaining the fiber reinforced thermoplastic from the twin screw processor. Further, a fiber reinforced thermoplastic composition prepared by an extrusion process the composition having a density between 1.3 g / cc to 1.7 g / cc and a flexural modulus of at least 4000 MPa is disclosed.

The invention relates to the technical field of plastic recycling, and discloses circulating nested plastic corner recycling injection molding equipment which comprises a machine base, a main machine barrel with a machine head at the left end is mounted at the upper end of the machine base through a mounting base, an exhaust screw is rotatably mounted on the inner wall of the main machine barrel, and a synchronous heating part is arranged on the outer wall of the exhaust screw. The circulating nested type plastic leftover material recycling injection molding equipment can effectively solve the problems that in the prior art, large-particle-size fragments which are not fully molten are prone to blocking a filter screen, a production line is forced to be frequently shut down to remove obstacles, the continuous production capacity is seriously restricted, particle size distribution dispersion of recycled leftover materials is high, and the production efficiency is high in the melting and mixing stage before injection molding. Due to heat conduction difference among particles, local plasticizing is insufficient or excessive degradation is caused, so that a final plastic product has apparent defects such as flow marks and mechanical property defects; and the recovered leftover material melt has high viscosity and is difficult to diffuse quickly after being directly put into a new plastic melt, so that the local concentration of the fused plastic melt is too high or too low.

This application relates to the field of cable materials, specifically disclosing a low-smoke, low-halogen polyvinyl chloride (PVC) cable material and its preparation method. The material includes the following raw materials: polyvinyl chloride resin, EVM500 rubber, heat stabilizer, antioxidant, plasticizer, lubricant, filler, flame retardant, flame retardant synergist, and acrylate processing aids. The flame retardant includes a mixture of aluminum hydroxide and magnesium hydroxide, and the flame retardant synergist includes a zinc borate and ammonium octamolate-sepiolite composite. The preparation method includes the following steps: mixing the raw materials according to a specified ratio, then melting and mixing them, followed by granulation and extrusion molding to obtain the low-smoke, low-halogen PVC cable material. This application alleviates the problem of traditional PVC cable materials producing large amounts of black smoke and toxic gases during combustion, reduces smoke density, and improves the material's environmental performance and flame retardant properties.

A method for determining manufacturing conditions of a polyarylene sulfide resin composition uses a dataset to execute a machine learning algorithm, thereby determining, in a case where a characteristic value of a characteristic improvement target item of the polyarylene sulfide resin composition is used as a target variable, an item in which a degree of importance of a change in the characteristic value for the characteristic improvement target item among a plurality of items contained in manufacturing condition data and physical property measurement data is high, the dataset including the manufacturing condition data and the physical property measurement data, the manufacturing condition data including at least a compounding component of the polyarylene sulfide resin composition, a mixing condition, and a temperature of a compound during melt mixing as manufacturing condition items, the physical property measurement data including at least an impact resistance of the polyarylene sulfide resin composition manufactured according to the manufacturing condition shown by the manufacturing condition data as a characteristic value item.

The utility model discloses a kind of melting mixing devices for plastic product processing, including mixing shaft, multiple blades are equipped with outside mixing shaft, moving device is arranged outside mixing shaft, protective device is connected with the top of mixing shaft, protective device includes control sleeve, displacement spring, clamping groove, connecting rod, displacement sleeve, connecting sleeve, displacement slot, clamping block, displacement block and card frame, displacement spring is connected with clamping block and displacement block, clamping groove is opened in the outside of connecting rod, displacement sleeve outer wall is connected with the inner wall of control sleeve by thread, displacement slot is opened in connecting sleeve, clamping block is arranged in one side of card frame, locking mechanism is installed in the outside of connecting sleeve, and locking mechanism includes rotary hole, rotating plate, sliding sleeve, movable spring, fixed block, movable block and support rod, rotary hole is opened on rotating plate, support rod is connected in one side of sliding sleeve, the utility model solves the technical defects of existing equipment in cleaning maintenance difficulty, power transmission system lacks effective protection and adjustable overload protection mechanism poor stability etc.

The application discloses a disinfection and sterilization functional resin master batch, a preparation method and application. The disinfection and sterilization functional resin master batch comprises a disinfection and sterilization functional material, is prepared by adopting resin slices and the disinfection and sterilization functional material to melt and mix and form, the resin slice material is selected from at least one of PET polyester, PP propylene, PS polystyrene and PA6 nylon, and the disinfection and sterilization functional material is a porous inorganic titanium zirconium phosphate functional material. The porous inorganic titanium zirconium phosphate functional material in the disinfection and sterilization functional resin master batch prepared by the method is uniformly distributed, and the porous inorganic titanium zirconium phosphate functional material on the surface of resin fibers or non-woven fabric fibers prepared by adopting the functional resin master batch is uniformly distributed. The disinfection and sterilization functional resin master batch can be used for producing disinfection and sterilization resin fibers, non-woven fabrics, air conditioner water tanks, air conditioner evaporation tanks, air conditioner shells, injection molding keys, remote controller shells and the like.

This invention relates to the field of composite fiber preparation technology, and discloses an antibacterial composite fiber and its preparation method, comprising: melting and mixing an antibacterial functional component containing matrix affinity segments and surface migration segments with a matrix polymer component; maintaining their miscibility using high shear transport; triggering phase separation of the antibacterial functional component and its migration to the surface of the fiber nascent body during extrusion to release shear force; and subsequently applying a rapid curing treatment to lock the antibacterial functional component in the surface layer. This invention utilizes the physicochemical properties between components and the control of process timing to achieve active self-assembly of functional components in fiber forming. This method can prepare composite fibers on conventional spinning equipment, achieving targeted enrichment and firm anchoring of functional components to the surface while maintaining the core mechanical properties of the matrix.

The utility model discloses a melt mixing and distributing device of a plastic pipe extrusion die, and belongs to the technical field of plastic pipe extrusion. Comprising a spiral body used for conveying a molten material extruded by an extruder to a mold cavity of a mold; the spiral body is provided with a flow dividing section, a spiral section, a mixing section and a distribution section which are sequentially communicated from the feeding end face to the discharging end face, the spiral body is provided with a melt autorotation mixing area which is arranged in a concave mode in the mixing section, and melt materials output by the spiral section continuously rotate under the inertia effect and flow forwards to enter the melt autorotation mixing area. Melt materials flowing out front and back are stacked in the melt autorotation mixing area and rotate and extrude each other to be mixed, the mixed melt enters a mold cavity through the distribution section, the melt material mixing effect is guaranteed, meanwhile, the axial length of the spiral section is shortened, and the production efficiency is improved. The short spiral section means that the shearing and friction time of the melt material in the spiral section is shortened, and heat accumulation caused by long-time flowing in the spiral section is reduced.

The present invention provides a method for preparing a phase change thermosetting resin for a heat dissipation composite, and a phase change thermosetting resin for a heat dissipation composite, which is prepared using same, the method comprising the steps of: mixing and melting an epoxy resin and a phase change compound so as to prepare a melted mixture; and adding a curing agent to the melted mixture and reacting same so as to induce an esterification bond between the thermosetting epoxy resin and the phase change compound. The phase change thermosetting resin is used as a matrix of various heat dissipation composites, and thus can improve excellent mechanical properties and heat dissipation properties of the composites.

The present invention relates to a polyolefin composition comprising a high melt strength polypropylene and a polyethylene wherein the high melt strength polypropylene is obtained or obtainable by a process comprising melt mixing a base polypropylene, a peroxide and a linear alpha-olefin composition comprising a linear C20 + alpha-olefin.

The present invention addresses the problem of providing a novel method for producing a recycled polystyrene-based resin composition, with which it is possible to provide a recycled polystyrene-based resin composition wherein physical properties deteriorated by processing are sufficiently recovered. This method for producing a recycled polystyrene-based resin composition comprises a mixing step for melt-mixing polystyrene-based resin waste and a high molecular weight polystyrene-based resin so as to obtain a resin composition, wherein the weight average molecular weight of the high molecular weight polystyrene-based resin is 500,000 to 5,000,000 inclusive.

The invention belongs to the field of material packaging, and discloses a bamboo fiber biodegradable film material and a preparation method thereof.The preparation method comprises the following steps that bamboo leaves are dried and smashed and then added into an ethanol-toluene azeotropic mixture, heating extraction and filtering are performed to obtain filter residues, then the filter residues are added into a complexing agent-hydrogen peroxide-containing aqueous solution with the pH being 3.5-4, and stirring is performed to obtain a mixed solution; continuously heating and stirring, filtering, washing to be neutral, and drying to obtain a fiber raw material; the preparation method comprises the following steps: adding a fiber raw material and an acid catalyst into an excessive anhydride solution, heating and stirring, adding deionized water to adjust the conductivity of the solution to reach a preset value, filtering, washing and drying to obtain composite modified powder; adding the composite modified powder and a plasticizer into a reaction kettle, melting, mixing and blow-molding to obtain the bamboo fiber biodegradable film material. According to the preparation method, chlorophyll and ash in the process of extracting bamboo fibers from bamboo leaves are removed, and the toughness and barrier property of the bamboo fiber biodegradable film material are improved.

The invention discloses a preparation method and system of a toughening impact-resistant injection molding material based on recycled GPPS, and belongs to the technical field of high polymer material modification.The method specifically comprises the following steps that recycled GPPS particles are subjected to surface polarity activation treatment, the surfaces of the particles are subjected to infiltration treatment through a hydroxyl-containing polymer water solution under the heating condition, and the particles are subjected to surface polarity activation treatment; the surface polarity is increased; the interface compatibility with subsequent additives is improved; the recycled GPPS particles subjected to surface activation and a compound toughening agent are subjected to melt mixing, the compound toughening agent comprises a core-shell structure elastomer and long-chain fatty acid ester, stress dispersion and energy absorption are achieved through the core-shell structure, and molecular chain plasticizing and interface lubrication are achieved through the long-chain fatty acid ester; and adding the compatilizer and the lubricant into the mixed system. By introducing a novel composite modification system and optimizing the technological process, the mechanical property of the recycled GPPS material is improved, the preparation technology is simplified, and the production cost is reduced.

The invention relates to iridium dioxide nano-powder as well as a preparation method and application thereof, the preparation method comprises the following steps: mixing an iridium source solution with alkali liquor to carry out coprecipitation reaction to obtain iridium hydroxide precipitate; mixing a molten medium, the iridium hydroxide precipitate and a solvent to obtain a precursor material, and performing heat treatment to obtain a molten mixture; and dispersing the molten mixture, and performing dialysis and vacuum freeze drying to obtain the iridium dioxide nano-powder. An iridium source is adopted as a raw material, an intermediate product iridium hydroxide precipitate is obtained through a co-precipitation reaction and then mixed with a molten medium for heat treatment to regulate the particle size of the powder and avoid agglomeration, then dialysis impurity removal and vacuum freeze drying are conducted, and the obtained iridium dioxide nano-powder is uniform in particle size, high in specific surface area and high in dispersing performance; as a catalyst, the catalyst has good catalytic performance and is suitable for multiple fields of chlor-alkali industry, electrochemical oxidation, hydrogen energy PEM, fuel cells and the like.

The raw materials for preparing this low-moisture-resistance transparent TPEE film include the following components: 85-95 parts of thermoplastic polyester elastomer, 1-10 parts of inorganic opening agent, 0.1-2 parts of organic slip agent, 0.1-2 parts of nucleating agent, and 0.1-1 parts of antioxidant. The preparation method involves first mixing the above components evenly using a mixer; then transferring the mixture into a barrel and baking the barrel with hot air at 85-125 degrees Celsius for 3-12 hours; next, feeding the baked mixture into a single-screw melt extruder of a blown film machine or casting machine using a feeder; finally, extending and shaping the molten mixture into a TPEE film using the cooling and shaping system of the blown film machine or casting machine, and then traction, stretching, and winding the TPEE film using a slitting system to obtain the low-moisture-resistance transparent TPEE film. This low-moisture-resistance transparent TPEE film exhibits excellent moisture permeability, water pressure resistance, and can be laminated with polyester fabrics, allowing for secondary recycling.

The invention relates to a preparation method of TLCP fiber, which comprises the following steps: mixing dried self-made TLCP resin, a flow modifier, an anti-dripping agent, an anti-ultraviolet agent and an antioxidant through a high-speed mixer, and adding from a main feeding port of a twin-screw extruder after mixing; and adding the modified TLCP resin particles into a single screw extruder with five temperature zones. According to the invention, the flow modifier is added, so that the melt viscosity of the TLCP resin can be effectively reduced, and the TLCP resin and the auxiliary agent can be fully melted and mixed in combination with multi-temperature-zone precise temperature control of the twin-screw extruder, so that extrusion blockage or particle quality fluctuation caused by non-uniform mixing is avoided, the raw material stability of a subsequent spinning process is improved, and the production cost is reduced. In addition, the tensile strength of the fiber is improved.

This invention discloses a method and system for preparing toughened and impact-resistant injection molding materials based on recycled GPPS, belonging to the field of polymer material modification technology. The method specifically includes the following steps: surface polarity activation treatment of recycled GPPS particles by impregnating the particle surface with a hydroxyl-containing polymer aqueous solution under heating conditions to increase surface polarity and improve interfacial compatibility with subsequent additives; melt mixing the surface-activated recycled GPPS particles with a compound toughening agent, wherein the compound toughening agent comprises a core-shell elastomer and a long-chain fatty acid ester, achieving stress dispersion and energy absorption through the core-shell structure and molecular chain plasticization and interfacial lubrication through the long-chain fatty acid ester; and adding a compatibilizer and a lubricant to the mixture. This invention improves the mechanical properties of recycled GPPS materials, simplifies the preparation process, and reduces production costs by introducing a novel composite modification system and optimizing the process flow.

The present invention provides a method for producing a molded article capable of achieving excellent extensibility by recovering a recycled plastic from a multilayer body that has a plastic film layer and a functional layer. This method for producing a molded article includes: an immersion step in which a multilayer body that has a plastic base material layer and a functional layer is immersed in an alkali-containing desorption liquid; a shaking step in which the multilayer body after immersion is shaken in the presence of water using a specific continuous shaking device that is provided with a dispersion medium in a container so as to obtain a recycled plastic; an extrusion step in which the recycled plastic or a composition that contains the recycled plastic is melted and kneaded at a specific temperature, and extruded; a take-up step in which the extruded melt-kneaded material is taken as a strand; and a molding step in which molding is performed using the strand.

This utility model discloses a heat exchange device for a long-running extruder hot oil system, comprising a demineralized water tank, a demineralized water circulating pump, a melt-mixing section cold oil cooler, a melt pump high-temperature oil cooler, and a demineralized water cooler. The demineralized water tank is connected to a demineralized water outlet pipeline, which is connected to the cold medium inlet of the melt-mixing section cold oil cooler via a first pipeline. The demineralized water outlet pipeline is also connected to the cold medium inlet of the melt pump high-temperature oil cooler via a second pipeline. The cold medium outlets of the melt-mixing section cold oil cooler and the melt pump high-temperature oil cooler are connected to the hot medium inlet of the demineralized water cooler. The hot medium outlet of the demineralized water cooler is connected to the circulating demineralized water inlet of the demineralized water tank. This device solves the core problems of severe scaling and short operating cycles in existing technologies, and can improve production continuity, reduce annual maintenance costs, and save labor and improve efficiency.

The invention belongs to the technical field of polyolefin cable materials, and particularly relates to a reversible cross-linked polyethylene composition, a reversible cross-linked polyethylene cable material, regenerated reversible cross-linked polyethylene granules, a regenerated reversible cross-linked polyethylene cable material and a preparation method and application thereof. Amino-containing dihydric alcohol is used as a modifying agent and firstly reacts with maleic anhydride grafted polyethylene, PE-g-MAH-OH containing excessive amino-containing dihydric alcohol is obtained through ring opening-ring closing reaction, and PE-g-MAH-OH serving as a key component is matched with polyethylene, fumed silica and an aliphatic amine structure control agent to obtain the reversible crosslinked polyethylene composition. The reversible cross-linked polyolefin cable material prepared by melting, mixing, molding and curing has better mechanical properties, high-pressure oil resistance and reprocessability.

This invention relates to the field of internal mixer technology and provides a melt mixing device for processing foamed plastic products. The device includes a docking and material-receiving frame, a hook frame, hook bodies, and a material-receiving and running mechanism. The docking and material-receiving frame is slidably disposed on the side of the mixing chamber and can slide into the opening of the mixing chamber for docking. Multiple L-shaped hook bodies are disposed on the side of the hook frame near the meshing rotor, allowing the meshing rotor and blades to contact the hook bodies. The material-receiving and running mechanism is vertically slidably disposed within the docking and material-receiving frame, and the hook frame is slidably connected to it. The material-receiving and running mechanism can drive the hook frame to perform a reciprocating motion in a U-shape. The hook frame can drive the hook bodies to slide along the surface of the meshing rotor and hook onto the molten material adhering to the meshing rotor, thereby achieving rapid completion of the material removal process in the mixing chamber and reducing the possibility of burns to workers.

The invention discloses a high-strength flame-retardant polypropylene material for a vehicle and a preparation method of the high-strength flame-retardant polypropylene material. The method comprises the following steps: adding polypropylene resin, ammonium polyphosphate, zinc borate containing crystal water, a compatilizer and an antioxidant into a main feeding port of a double-screw extruder, melting and mixing; chopped glass fibers are added into a middle-section side feeding opening; organic silicon resin powder and a lubricating agent are added into a rear-section auxiliary feeding opening; and plasticizing, extruding, cooling and pelletizing to obtain the flame-retardant reinforced polypropylene material. Through reasonable component proportion and feeding sequence design, P-B-Si multi-element synergistic construction of a compact carbon layer is realized in the combustion process, melt dripping is effectively inhibited, the flame retardant efficiency and the carbon layer stability are improved, and meanwhile, relatively high tensile strength, bending property and impact toughness are kept; the comprehensive requirements of the automobile industry on light weight, high strength and flame-retardant safety of the material are met.

The invention relates to a device for improving the anti-falling performance of vessel glass and a composite strengthening method, which are characterized by comprising the following steps: (1) flexibly bundling non-key stress parts of the vessel glass through stainless steel wires, suspending the vessel glass on a chemical tempering frame, and immersing the vessel glass in a molten mixed salt bath for ion exchange; (2) ultrasonically cleaning with deionized water, drying, cooling, putting into a physical tempering clamp, and feeding into a physical tempering furnace for heating and quenching treatment; (3) binding the physically tempered vessel glass on the chemical tempering frame again through the stainless steel wire, and immersing the vessel glass in the molten salt bath for secondary ion exchange; (4) then taking out and placing in a drying oven for gradient slow cooling to room temperature; after the strapping steel wires are removed, deionized water is used for ultrasonic cleaning, drying is conducted, and the vessel glass product with the reinforced anti-falling performance is obtained. The method has the advantages that the advantages of physical strengthening and chemical strengthening are combined, the falling height of unstrengthened container glass can be increased from 30 cm to 1 m, and the container glass is not damaged after falling by 90% or above.

The invention belongs to the technical field of high polymer materials, and particularly relates to a method for enhancing modified polystyrene recycled materials. Aiming at the problems in the prior art, the invention provides the method for enhancing the modified polystyrene recycled material, and the method comprises the following steps: crushing and drying the polystyrene recycled material to obtain a dried polystyrene recycled material with the water content of less than 500ppm; the preparation method comprises the following steps: adding 82-92 parts by mass of dried recycled polystyrene, 6-12 parts by mass of reinforced resin, 1-5 parts by mass of a compatibilizer, 0.3-1 part by mass of a composite lubricant, 0.2-0.5 part by mass of a composite antioxidant, 0.05-0.2 part by mass of an odor eliminating agent and 0.5-3 parts by mass of a modified nano reinforcing agent into a high-speed stirrer, and mixing for 2-5 minutes to obtain a mixed raw material; and adding the mixed raw material prepared in the step 2 into a vacuum twin-screw granulator, and carrying out melt mixing, extrusion, cooling and grain-sized dicing to obtain the polystyrene recycled material reinforced modified material. The invention provides a technical scheme for reinforcing and modifying a recycled material system, so that the finally prepared modified material has better strength.

The present invention relates to a polyethylene composition with improved rheological properties, while maintaining thermal properties and mechanical properties, the polyethylene composition having a MFR5 (5.0 kg, 190 °C, ISO 1133) of 0.1 to 4.0 g / 10min, and a viscosity at a constant shear stress of 747 Pa, eta747, of equal to or more than 130 kPa•s, said polyethylene composition being obtainable or obtained by a process comprising the steps of a) providing a polyethylene base resin (A) having a MFR5 (5.0 kg, 190 °C, ISO 1133) of 0.1 to 3.0 g / 10min and optionally comprising a content of one or more C3 to C12 alpha-olefin co-monomer(s) of from 1 to 10 wt.-%, based on the total weight of the polyethylene base resin (A), preferably further melting the polyethylene base resin (A) in an extruder, b) mixing said polyethylene base resin (A) in an amount of from 73.5 to 99.99 wt.-% with a radical initiator (B), selected from the group consisting of the peroxy compounds according to formulae (I) to (III), in an amount of from 0.01 to 1.5 wt.-%, based on the total weight of a resulting mixture, and any mixtures thereof, preferably melt mixing said polyethylene base resin (A) with the radical initiator (B) in a melt mixing device, such as an extruder; and c) reacting said polyethylene base resin (A) and the radical initiator (B) at a temperature within the range of from 150 to 300 °C, thereby obtaining the polyethylene composition. The present invention further relates to a process for producing the polyethylene composition, to articles comprising the polyethylene composition, and to the use of the polyethylene composition for making an article, preferably a pipe or a supplementary pipe article.