40 results about "Renewable Polyethylene" patented technology

The invention relates to the technical field of process control, and discloses a multiple cyclic utilization process control method of regenerated polyethylene for tailing seepage prevention, which comprises the following steps: synchronously acquiring melt pressure, screw driving motor current and a control input sequence, calculating a cross-correlation function of the current and the pressure, and identifying physical transmission lag time; monitoring an uncommanded residual component of the current in real time, deducing an impending pressure fluctuation amplitude based on a cross-correlation function, and generating an inertia feedforward compensation amount; according to the method, a dual-time scale model is utilized to update parameters online and construct a disturbance observer to generate a feedback compensation control quantity, feedforward and feedback compensation are superposed to a basic output quantity to generate a final driving instruction, a heterogeneous signal time sequence correlation mechanism is utilized, reverse adjustment is carried out before pressure fluctuation is transmitted to a machine head through a screw, and the pressure fluctuation is reduced. And a control blind area caused by physical transmission lag is avoided.

The present invention provides polyethylene and a polyethylene composition comprising same, the polyethylene having excellent surface impact strength with no change in processability, when combined with recycled polyethylene, and being capable of improving the drop impact strength of a final product.

The invention discloses a high-toughness regenerated plastic dropper material based on a waste mulching film and a preparation method of the high-toughness regenerated plastic dropper material, belongs to the technical field of material regeneration, and is used for solving the technical problem that the tensile property and the impact resistance of a regenerated plastic dropper material in the prior art need to be further improved. According to the invention, a silica ion reinforcing component, boric acid ester modified regenerated polyethylene and hydroxyl carbamate flexible polyurethane are synergistically compounded, and a multi-scale structure system in which an inorganic-organic hybrid constraint structure, a dynamic reversible connection unit and a flexible dissipation channel are combined is constructed in the material; the material forms a stable interface coupling and continuous stress transfer path in the melting processing and service stress process, so that the material gives consideration to structural bearing, morphology stability and energy distribution capability, and is suitable for plastic dropper products with comprehensive requirements on mechanical properties and heat resistance.

A method of making a polyolefin composition is provided, the method comprising: 1) extruding at least one recycled polyolefin in the presence of at least one free radical initiator (E) to make an extruded vis-broken recycled polyolefin; and 2) melt blending (A) from about 60 wt% to about 96 wt% of the extruded recycled polyolefin; (B) from about 2 wt% to about 20 wt% of at least one random alpha-olefin copolymer; and (C) optionally from about 2 wt% to about 20 wt% of at least one tackifier; (D) optionally at least one additional polymer; wherein the polyolefin composition has a weight ratio of random alpha-olefin copolymer to tackifier of between about 0.2 to about 5.0; and wherein the extruded vis-broken polyolefin composition has an increase in melt flow rate of from about 5% to about 1500% compared to the recycled polyolefin.

The utility model provides a heating system for corrosion-resistant treatment of regenerated polyethylene pipes, which relates to the technical field of regenerated polyethylene pipe processing and comprises a mixer, a double-helix mixer is arranged at the bottom of the mixer, a discharge port is arranged on one side of the double-helix mixer, a heating furnace body is arranged at the other end of the double-helix mixer, and the heating furnace body is connected with the double-helix mixer. A temperature control assembly is arranged in the heating furnace body, a material conveying pipe is arranged on one side of the heating furnace body, a valve is arranged at the position of the material conveying pipe, the other end of the material conveying pipe is connected with a single-screw film blowing machine extrusion system, a conveying pipe is arranged on one side of the single-screw film blowing machine extrusion system, a cooling system is arranged on one side of the conveying pipe, and the single-screw film blowing machine extrusion system is arranged on the other side of the conveying pipe. A winding roller is arranged on the side, away from the conveying pipe, of the cooling system. The device solves the problems of uneven dispersion, insufficient binding force and inaccurate performance evaluation in the conventional method for improving the performance of the regenerated polyethylene pipe by adding a corrosion-resistant method in the production of the regenerated polyethylene pipe.

The application relates to the technical field of pavement base materials, and relates to a modified rubber-plastic asphalt pavement surface layer composite material and a preparation method thereof.The modified rubber-plastic asphalt pavement surface layer composite material comprises the following components: 30-60 parts of base asphalt, 50-90 parts of waste tire rubber powder, 12-24 parts of regenerated polyethylene, 8-15 parts of regenerated polypropylene, 5-12 parts of modified polyethylene terephthalate, 6-9 parts of a compatilizer, 10-18 parts of mineral powder filler, and 5-16 parts of an additive.The modified polyethylene terephthalate is prepared by being soaked in a dopamine solution for modification.Waste rubber, PE, PP and PET are used as modifiers together or separately, are mixed into petroleum asphalt, and are combined with aggregates to form high-performance asphalt mixture.This kind of material combines the elasticity of rubber, the strength of plastic and the adhesion of asphalt, and has obvious advantages in the fields of high-grade highways, urban roads, airport pavements and the like.

The present invention provides polyethylene having improved processability and resistance to environmental stress cracking as well as retaining excellent mechanical properties when combined with recycled polyethylene, and a polyethylene composition comprising same.

A mixed virgin / recycled polyethylene composition having a melt flow rate, MFR2, in the range of from 0.01 to 2.5 g / 10min, determined according to ISO1133:2022, and a density of from 900.0 to 975.0 kg / m³, determined according to ISO 1183-1:2019; the composition comprising 35.0 wt.% or more of a recycled polyethylene fraction (rPE) relative to the total weight of the mixed / recycled polyethylene composition; wherein said recycled polyethylene fraction (rPE) has a total amount of ethylene units (C2 units) of at least 85.0 wt.% as determined by quantitative 13C{1H} NMR spectroscopy as described herein; a total amount of continuous propylene units (C3 units) in an amount of from 0.0 to 5.0 wt.% as determined by quantitative 13C{1H} NMR spectroscopy as described herein; at least one of: a content of iron (Fe) of 100 ppm or less, a content of titanium (Ti) of 700 ppm or less, a content of zinc (Zn) of 300 ppm or less, a content of chlorine (Cl) of 600 ppm or less, and / or a content of sulfur (S) of 120 ppm or less, determined by x-ray fluorescence (XRF) as described herein; wherein a total content of Fe, Ti, Zn, Cl and S amounts to at least 10 ppm; and wherein said mixed virgin / recycled polyethylene composition further comprises at least one virgin polyethylene component (B), and more than 0.2 wt.% of a pigment, preferably carbon black (CB), determined by TGA as described in measurement methods, based on the total amount of the mixed virgin / recycled polyethylene composition. A method for preparing said mixed virgin / recycled polyethylene composition, an article comprising the same and the use thereof for the production of wire and / or cable jacketing.

The application discloses a power tube based on regenerated plastics and a preparation method thereof, and relates to the field of regenerated plastic utilization.The power tube comprises the following raw materials in parts by weight: 55-65 parts of regenerated polyethylene, 8-10 parts of butyl rubber, 3-5 parts of maleic anhydride grafted polyethylene, 2-4 parts of modified montmorillonite, 5-8 parts of carbon black N550, 2-3 parts of a crosslinking agent, 0.5-1.0 parts of a lubricant, 0.1-0.3 parts of a light stabilizer, 0.2-0.4 parts of an antioxidant and 0.4-0.6 parts of dicumyl peroxide.The synergistic modification of the crosslinking agent and the modified montmorillonite effectively improves the mechanical property, damping property, heat resistance, waterproof property and salt mist resistance of the power tube based on regenerated plastics, and the power tube is endowed with excellent flame retardance.

The present invention relates to a mixed virgin polyethylene / recycled polyethylene composition having a melt flow rate MFR2 (ISO 1133:2022, 2.16 kg, 190 °C) in the range of from 0.10 to less than 1.00 g / 10 min and a density (ISO 1183-1:2019) in the range of from 946 to 980 kg / m3, the composition comprising A) a recycled polyethylene fraction (rPE), wherein the recycled polyethylene fraction is present in an amount of 40 wt.-% or more, based on the total weight of the mixed virgin polyethylene / recycled polyethylene composition, and wherein the recycled polyethylene fraction (rPE) has a content of titanium (Ti) of from 500 to 5,000 ppm, determined by X-ray fluorescence (XRF) spectroscopy as described herein and based on the total weight of the recycled polyethylene fraction (rPE), B) a virgin polyethylene fraction comprising at least a first virgin polyethylene component (vPE1), C) at least 0.3 wt.-% of one or more pigment(s), preferably carbon black (CB), and D) one or more metal deactivator(s), wherein the mixed virgin polyethylene / recycled polyethylene composition has, as determined by quantitative 13C{1H} NMR spectroscopy as described herein: a) a total amount of ethylene units (C2 units) of at least 90.0 wt.-%, and b) a total amount of continuous propylene units (C3 units) in the range of from 0.1 to 5.0 wt.-%. The present invention further relates to a method of preparing the mixed virgin polyethylene / recycled polyethylene composition, an article comprising the same and the use of the mixed virgin polyethylene / recycled polyethylene composition for wire and / or cable jacketing applications.

This invention relates to the field of process control technology and discloses a process control method for the multiple recycling of recycled polyethylene for tailings seepage prevention. The method includes: synchronously acquiring melt pressure, screw drive motor current, and control input sequence; calculating the cross-correlation function between current and pressure and identifying physical transmission lag time; real-time monitoring of the non-command residual component of the current; extrapolating the amplitude of impending pressure fluctuations based on the cross-correlation function and generating an inertial feedforward compensation quantity; using a dual-timescale model to update parameters online and constructing a disturbance observer to generate a feedback compensation control quantity; and superimposing the feedforward and feedback compensation onto the basic output quantity to generate the final drive command. This invention utilizes a heterogeneous signal timing correlation mechanism to implement reverse adjustment before pressure fluctuations are transmitted to the die head via the screw, avoiding control blind spots caused by physical transmission lag.

A polyethylene composition for preparing strapping tape, comprising: A) 60% to 98% by weight of an ethylene polymer component having a density DA of 950 to 965 kg / m³. 3 The MIF value is 15 to 50 g / 10 min, and the stress cracking resistance, as determined by the full-notch creep test (FNCT) according to ISO 16770:2004 at 50 °C, 6.0 MPa, and 2% by weight of Arkopal N100 aqueous solution, is equal to or greater than 3 hours; B) 2% to 40% by weight of ethylene polymer component, the density of which is D B 949 to 965 kg / m 3 The MIE value is 0.1 to 3 g / 10 min, and the polydispersity index (PDI) is 6 to 25; where PDI is the ratio of weight-average molecular weight Mw to number-average molecular weight Mn, Mw / Mn, and the amounts of A) and B) refer to the total weight of A) + B).

The invention discloses an environment-friendly PE (polyethylene) composite fresh-keeping bag with natural antibacterial activity grains, which belongs to the field of fresh-keeping bags and is formed by processing raw materials including an environment-friendly PE base material, natural antibacterial activity grain powder, opening master batch, toughening master batch and antifogging master batch. The environment-friendly PE base material is a blend of degradable polyethylene (PBAT / PLA blending type) and regenerated polyethylene, and the mass ratio of the degradable polyethylene to the regenerated polyethylene is (5: 1)-(3: 2). According to the environment-friendly PE composite fresh-keeping bag with the natural antibacterial active cereals, the ratio of the environment-friendly PE base material to the natural antibacterial cereal powder is optimized, and the auxiliary functional master batch is combined, so that the prepared composite fresh-keeping bag has the three advantages that the composite fresh-keeping bag is natural, antibacterial and safe, and has no chemical agent migration risk; the material is environment-friendly and degradable, and white pollution is reduced; the low-temperature mechanical property is excellent, and the refrigerator environment is adapted; the fresh-keeping bag can obviously prolong the fresh-keeping period of food materials in the refrigerator, is suitable for families, supermarkets and other scenes, and has high practical value and market prospects.

We provide a rust-preventive film that offers excellent rust prevention while using recycled resin. [Solution] A rust-preventive film comprising at least a first layer containing virgin polyethylene and a volatile rust inhibitor, and a second layer containing recycled polyethylene and an antioxidant, wherein the first layer and the second layer are co-extruded.

The present disclosure relates to a polyethylene composition particularly suited for blow molding, comprising: A) from 99.5% to 94% by weight of a recyclate polyethylene component; and B) from 0.5% to 6% by weight of a polypropylene composition comprising from 8% to 30% by weight of a propylene polymer fraction (a) and from 70% to 92% by weight of a polymer fraction (b) comprising one or more copolymer(s) of ethylene containing an amount of units deriving from ethylene equal to or lower than 40% by weight, wherein the polymer fraction (b) comprises a fraction soluble in xylene at 25°C equal to or greater than 60% by weight.

The invention belongs to the technical field of plastic recovery, and provides a regeneration method of a post-consumption polyethylene film, which can effectively remove pollutants on the surface of the post-consumption polyethylene film, destroy crystal points generated by cross-linking aging and improve the physical properties of regenerated polyethylene through the processes of abrasive washing, dehydration, grinding and the like. The obtained regenerated polyethylene has good physical properties.

The present invention provides polyethylene having improved resistance to environmental stress cracking as well as retaining excellent mechanical properties when combined with recycled polyethylene, and a polyethylene composition comprising same.

The invention provides electric self-curing steel slag-based ultra-high performance concrete and a preparation method thereof, and belongs to the technical field of building materials. The main components comprise cement, silica fume, mineral powder, steel slag, water, a water reducing agent, regenerated polyethylene particles and regenerated carbon fibers; the concrete is prepared from the following components in parts by weight: 900 to 1000 parts of cement, 50 to 100 parts of silica fume, 100 to 150 parts of mineral powder, 900 to 1200 parts of steel slag, 100 to 200 parts of water, 15 to 20 parts of a water reducing agent, 100 to 120 parts of regenerated polyethylene particles and 10 to 20 parts of regenerated carbon fibers. The mixing amount of the fibers is 1%-3% of the total volume of the fiber concrete. Through practical application of fibers, the invention provides a solution that high tensile strength, high compressive strength and high ductility of concrete in the prior art are difficult to coexist in alpine regions or emergency rescue.

The present invention relates to a polyethylene composition comprising a polyethylene, preferably ≥95.0 wt % of polyethylene, and further (a) ≥100 and ≤500 ppm of a phenolic antioxidant; (b) ≥500 and ≤2500 ppm of an organic phosphite stabiliser; and (c) ≥500 and ≤2500 ppm of a metal stearate with regard to the total weight of the polyethylene composition. Such polyethylene composition, when used in a moulding process with PCR polyethylene, results in a reduction of the quantity of degradation products formed, which may be observed as a reduction of die deposits.

The present invention provides a polyethylene resin which, when combined with recycled polyethylene, retains excellent mechanical properties, has improved resistance to environmental stress cracking, and also prevents discoloration, and a polyethylene resin composition comprising same.

The present invention provides polyethylene having improved resistance to environmental stress cracking as well as retaining excellent processability and mechanical properties when combined with recycled polyethylene, and a polyethylene composition comprising same.

To provide a method for producing a polyethylene-based resin foam sheet which has stable foamability and excellent productivity, even when producing a foam sheet using a recycled raw material.SOLUTION: A method for producing a polyethylene-based resin foam sheet kneads, extrudes and foams a polyethylene-based resin and a foaming agent, and obtains a foam sheet, wherein virgin low density polyethylene (A) and a recycled polyethylene material (B) are used as the polyethylene-based resin, the recycled polyethylene material (B) contains 0.01 mass% or more of an ash content, in a DSC curve obtained by heat flux differential scanning calorimetry of the polyethylene-based resin, a ratio (Y / X) of heat of fusion (Y) on a higher temperature side than a top temperature of a maximum endothermic peak to heat of fusion (X) on a lower temperature side than the top temperature of the maximum endothermic peak is 0.2 or more and 0.5 or less.SELECTED DRAWING: None

In some embodiments, a flat-bottom pouch (SUP) is prepared using a polyethylene structure with a first and a second band. The bands are laminated together to form the polyethylene structure used to prepare the SUP. One band contains a layer of recycled polyethylene (r.PE). In some cases, the use of r.PE has been observed to reduce the effectiveness of the sealing layer of the overall structure. In some embodiments, the SUP described herein has a two-layer sealing system to mitigate this problem.

The invention belongs to the technical field of high polymer materials and food packaging safety, and particularly relates to a method for identifying regenerated polyethylene. The invention provides a method for identifying regenerated polyethylene, which is simple, convenient, accurate and efficient, and the regenerated polyethylene is identified by detecting a sample to be detected by utilizing an ultraviolet spectrum method, collecting and screening obtained spectral data and identifying the data by utilizing an identification model of a chemometrics method. The invention also provides application of the method in identification of polyethylene recycled plastics. According to the method, an ultraviolet spectrum method and a chemometrics method are combined, a data processing method is used for preprocessing, a chemometrics model is combined for screening characteristic data, then the discrimination model is established based on the characteristic data for discrimination, the discrimination accuracy rate reaches up to 100%, the discrimination result is more visual and stable, and the method is easy to operate, environmentally friendly and suitable for popularization and application. The primary polyethylene and the regenerated polyethylene can be quickly and accurately identified, and a powerful guarantee is provided for identification work of the regenerated polyethylene.

The present invention provides polyethylene having improved processability and resistance to environmental stress cracking as well as retaining excellent mechanical properties when combined with recycled polyethylene, and a polyethylene composition comprising same.

Electron beam irradiation (at a total dose of up to 50 kGy) is used to degrade and partially cross-link a blend of recycled polyethylene (PE) (for example, LDPE) obtained at least in part from used articles and recycled polypropylene (PP) obtained at least in part from used articles (and optionally also recycled polyethylene terephthalate (rPET)) to create a new complex partially cross-linked “Super PE” material. The Super PE material is less than 30% PP. Importantly, the Super PE material is flowable and has a complex viscosity CV of less than or equal to 6000 Pa·s@230° C. at 1 Hz, while also exhibiting a modulus of elasticity E of a least 300 MPa, an ultimate stress at failure 6 of at least 15 MPa, and an ultimate strain at failure E of at least 600%. The material is pelletized, and then sold for use in making new articles.

The present invention relates to a tubular film intended to form a stretch hood. The tubular film has a core layer and at least one skin layer. The core layer comprises, by weight of the core layer: 30-80% of recycled polyethylene; 10-35% of a polymer booster selected from a thermoplastic elastomer and a polyolefin plastomer; and 0-40% of virgin ethylene polymer and / or virgin ethylene based copolymer.

The application discloses a kind of high flame-retardant high toughness XPE foamed materials and preparation process thereof, the foamed material is made of the following weight parts of components: polyethylene resin, elastomer, synergistic intumescent halogen-free flame retardant, crosslinking agent, foaming agent, foaming aid, stabilizer, lubricant and auxiliary agent;Each component is premixed at high speed, then extruded into unfoamed continuous sheet;Then the sheet is sent into the foaming furnace for two-stage heating, the first stage activates the crosslinking agent to partially crosslink the polyethylene to form a network structure, and the second stage activates the foaming agent to decompose and expand to form a closed-cell structure and complete deep crosslinking;Finally, cooling winding is carried out, the beneficial effect is that the problem of high brittleness of traditional flame-retardant XPE material is solved, the mechanical toughness and flame-retardant performance of the material are significantly improved, and at the same time, the use of recycled polyethylene realizes environmental protection and sustainability.