643 results about "Melt flow index" patented technology

The invention discloses a technology for manufacturing a thin film by recycling and calendering a polytetrafluoroethylene material, and belongs to the technical field of high polymer material recycling and processing, the technology for manufacturing the thin film by recycling and calendering the polytetrafluoroethylene material comprises the following steps: crushing waste products, and carrying out three-stage screening impurity removal and melt index detection; after being cleaned by supercritical carbon dioxide, the qualified material is mixed with industrial by-product filler, waste tire rubber powder and the like, low-temperature mixing is conducted through a double-screw extruder, and mixing parameters are automatically regulated and controlled through a tension sensor; performing calendaring forming by a five-roller calendaring unit, preheating the first two rollers, performing differential stretching by the middle three rollers, engraving a micro groove by the third roller, and controlling the thickness precision to be + / -3% by an online thickness gauge; the film is slit after being compounded according to requirements, and scrap edges are crushed and recycled. The method realizes efficient recovery of waste polytetrafluoroethylene, and has the advantages of thorough impurity removal, stable performance, environmental protection and energy saving.

The invention provides a bio-based 1, 4-butanediol composition and a preparation method thereof, and polyester prepared from the bio-based 1, 4-butanediol composition, the bio-based 1, 4-butanediol composition comprises bio-based 1, 4-butanediol, an acidic compound, a nitrogen-containing compound and acetal; the content of acetal in the bio-based 1, 4-butanediol composition is less than or equal to 195ppm. According to the invention, polyester prepared by taking the bio-based 1, 4-butanediol composition as a raw material has a low color value and a low melt index.

The invention discloses a continuous fiber reinforced thermoplastic composite material and a preparation method thereof. The continuous fiber reinforced thermoplastic composite material comprises 35-40% of a polypropylene matrix with a melt index of 10-30 g / 10 min; 55% of continuous fibers are selected from glass fibers, carbon fibers or basalt fibers which are arranged in one direction, and the monofilament diameter is 9-15 microns; the intumescent flame retardant and the ammonium polyphosphate are compounded according to the mass ratio of 2: 1; 1-2% of an interface modifier, wherein a silane coupling agent KH-570 or PP-g-MAH is selected and used; the roughness Ra of the aluminum foil layer is 1.5-2.5 microns; under the condition of basically ensuring that the overall performance of the material is not greatly influenced, the application capability of the material is expanded, and the fireproof and flame-retardant capability of the material is improved, so that a thermoplastic composite material scheme can also be adopted under various harsh use conditions.

The invention belongs to the technical field of composite materials, and particularly discloses a polypropylene composite material, a preparation method thereof and automobile interior and exterior ornaments.The polypropylene composite material is prepared from, by weight, 40-60 parts of first polypropylene resin, 15-25 parts of second polypropylene resin, 6-25 parts of flexibilizer, 18-23 parts of talcum powder, 0.1-1.5 parts of weather-proof agent and 1.5-3 parts of antioxidant; wherein the melt index of the first polypropylene resin is smaller than that of the second polypropylene resin; the mesh number of the talcum powder is 2250 to 5000. The polypropylene composite material has relatively high low-temperature impact resistance and relatively high rigidity, and can improve the safety performance of an automobile when being applied to interior and exterior ornaments of the automobile.

The invention discloses a method for testing a melt index. The method comprises the following steps: preheating a melt charging barrel to a preset temperature, and carrying out heat preservation for a first preset time; feeding to be measured is loaded into a containing cavity of a melting charging barrel, a piston rod is inserted into the melting charging barrel, a mass piece with the first weight is added to the piston rod, the feeding to be measured is melted into molten feeding under the pressure of the piston rod and is compacted, and therefore falling materials with the preset length are exposed out of a discharging opening of the melting charging barrel; switching the weight of the mass piece on the piston rod from the first weight to the second weight, so that the to-be-detected feed flows out of the discharge port under the pressure of the piston rod and is cut to obtain a plurality of sections of first to-be-detected samples, and calculating the melt index of the to-be-detected feed; the range of the first weight is 2.16 kg to 10 kg, and the range of the preset length is 1 cm to 30 cm. Therefore, the air in the melt charging barrel can be exhausted, the components of the to-be-tested feed are more uniform, the uniformity of the first to-be-tested sample is improved, the fluctuation of the tested melt index is reduced, and the accuracy of the test result is improved.

The invention relates to the field of preparation of non-woven materials, and discloses a preparation method of a two-component spunbonded non-woven material, which comprises the following steps: (1) performing sheath-core two-component spinning on molten metallocene polyethylene and molten polyester, the melt index of the metallocene polyethylene being 5-10g / 10min at 240 DEG C under the load of 2.16 kg; (2) the bi-component trickles obtained in the step (1) are subjected to double-side air blowing cooling forming, and filaments are obtained; (3) carrying out wide slit type airflow drafting on the filaments in the step (2), and then carrying out filament separation and net laying; and (4) the fiber web laid in the step (3) is sequentially subjected to hot air setting and hot rolling bonding reinforcement, and the hot air temperature of hot air setting ranges from 110 DEG C to 140 DEG C. By adopting the method, the high-wrinkle skin-core double-component spunbond non-woven material with higher strength and better flexibility can be obtained.

The invention discloses a biodegradable polyester material as well as a preparation method and application thereof, and belongs to the technical field of high polymer materials. The biodegradable polyester material provided by the invention is prepared from the following components in parts by mass: 78 to 97 parts of biodegradable polyester composition, 3 to 22 parts of surface modified calcium carbonate, 0.05 to 0.55 part of chain extender and 0 to 1 part of processing aid, the biodegradable polyester composition comprises PBAT (poly (butylene adipate-co-terephthalate)), PLA (polylactic acid) and PPC (polypropylene carbonate), wherein the mass ratio of the PBAT to the PLA to the PPC is (80-90): (1-10): (1-10); the melt index of the PBAT at 190 DEG C / 2.16 kg is less than or equal to 10 g / 10 min; the molar content of D-lactic acid in the PLA is greater than or equal to 2%; the D50 particle size of the surface modified calcium carbonate is less than or equal to 2.2 microns. The biodegradable polyester material provided by the invention has excellent delayed edge sealing performance and puncture strength.

The invention provides a shoe material master batch based on coffee grounds and a preparation method thereof. The shoe material master batch comprises the following raw materials in parts by mass: 100 parts of coffee grounds, 30-70 parts of a thermoplastic material, 5-10 parts of an isocyanate-terminated polyurethane prepolymer, 3-10 parts of a compatibilizer, 1-5 parts of a filler and 0.1-1 part of an antioxidant. The content of the coffee grounds in the shoe material master batch is 50% or above, the isocyanate-terminated polyurethane prepolymer is applied to the highly-doped coffee grounds system, the interface bonding force between the coffee grounds and a thermoplastic material matrix and the melt supporting capacity can be remarkably improved through the cooperation of the isocyanate-terminated polyurethane prepolymer and the filler, the shoe material master batch has the good melt index and melt strength, and the service life of the shoe material master batch is prolonged. The foaming material has good processability and foaming performance, so that the foaming material can be better applied to foaming shoe materials.

Processes for producing activated chromium catalysts such as titanated chromium / silica catalysts are disclosed, and these processes utilize a multistep process involving exposure to inert and oxidizing atmospheres at specific temperature conditions. The resulting activated chromium catalysts have unexpectedly high melt index potential and can produce ethylene-based polymers with lower gel counts in addition to higher melt indices.

The invention discloses a cross-linking type biodegradable POF heat shrink film and a preparation method thereof, and belongs to the technical field of heat shrink films, and the cross-linking type biodegradable POF heat shrink film is characterized by comprising three layers of films which are sequentially attached, each of the first-layer film and the third-layer film comprises the following raw materials in percentage by weight: 89.5-94% of PP, 2-6% of degradable master batch, 0.5-3% of an anti-blocking agent and 1-4% of a slipping agent; the second-layer film is prepared from the following raw materials in percentage by weight: 30 to 35 percent of LLDPE-A, 9 to 14.5 percent of toughening agent, 0.5 to 1 percent of degradable master batch, 40 to 45 percent of LLDPE-B and 10 to 15 percent of metallocene LLDPE; the melt index of the LLDPE-A is 2.5 g / 10min, the melt index of the LLDPE-B is 2.1 g / 10min, the melt index of the metallocene LLDPE is 1.0 g / 10min, and through the synergistic effect between the LLDPE with different melt indexes and the flexibilizer, the low-temperature tear resistance of the heat shrink film is effectively improved.

The invention relates to the field of polymer composite board processing, and particularly discloses a light fiber reinforced thermoplastic resin composite board and a preparation method thereof.The light fiber reinforced thermoplastic resin composite board comprises a PP upper adhesive film layer, a fibrofelt, a PP lower adhesive film layer and PET non-woven fabric; each of the PP upper adhesive film layer and the PP lower adhesive film layer consists of a low-melt-index PP adhesive base film and a high-melt-index PP adhesive film; the low-melt-index PP adhesive base film is in contact with the fiber felt; the melt index of the low-melt-index PP rubber base film is 2-10 g / 10 min, and the melt index of the high-melt-index PP rubber base film is 100-150 g / 10 min; the preparation method comprises the following steps: preparing the PP upper adhesive film layer and the PP lower adhesive film layer; the fiber felt is located between the PP upper adhesive film layer and the PP lower adhesive film layer, the PET non-woven fabric is attached to the other side of the PP lower adhesive film layer, rolling forming is conducted at the temperature of 280-320 DEG C, and a composite board is obtained; the adhesive has the advantages of stripping resistance and good adhesion stability of each layer.

The invention belongs to the technical field of high polymer materials, and particularly relates to a polyolefin composite material as well as a preparation method and application thereof. The polyolefin composite material is prepared from the following raw materials: polyethylene, a polyolefin toughening agent, a compound flame retardant and a filler, the melt index of the polyethylene at 190 DEG C / 2.16 kg is greater than or equal to 18 g / 10 min, and the bending modulus is less than or equal to 160 MPa; the polyolefin toughening agent is selected from at least one of an ethylene-propylene copolymer, an ethylene-butylene copolymer and an ethylene-vinyl acetate copolymer, and the melt index at 230 DEG C / 2.16 kg is greater than or equal to 9 g / 10 min; the compound flame retardant comprises tetrabromobisphenol S bis (2, 3-dibromopropyl) ether, antimony trioxide and hydroquinone bis (diphenyl phosphate), and the filler is at least one of talcum powder, barium sulfate and wollastonite. Through specific types of polyethylene, the polyolefin flexibilizer, the compound flame retardant and the filler, excellent flame retardance and toughness can be obtained.

The invention belongs to the technical field of high-voltage cross-linked polyethylene compositions, and particularly relates to a water-tree-resistant cross-linked polyethylene insulating composition for a high-voltage direct-current submarine cable and a preparation method and application of the water-tree-resistant cross-linked polyethylene insulating composition. The insulating composition comprises the following components in parts by weight: 80-120 parts of low-density polyethylene resin with a melt index of 1.9-2.1 g / 10min; 0.2 to 0.3 part of a composite antioxidant; 1.25 to 1.85 parts of a composite cross-linking agent; 0.2 to 0.3 part of a scorch inhibitor; 8-12 parts of a water-inhibiting master batch; wherein the water-inhibiting master batch is prepared from 80 to 120 parts of composite polyolefin resin, 6 to 9 parts of composite water-inhibiting agent, 3.6 to 5.4 parts of maleic anhydride graft and 0.15 to 0.25 part of antioxidant; the composite water inhibitor comprises polyethylene glycol and oleamide in a mass ratio of (8-12): 1. The insulation composition can inhibit insulation scorching and resist insulation water tree growth, and is high in gel content, high in extrusion cabling speed and stable in production process.

The invention relates to the technical field of material performance detection, in particular to a rapid testing method for thermal aging failure of an oil and gas pipeline anticorrosive coating material, which comprises the following steps: testing oxidation induction time t of a sample; respectively carrying out thermal aging with different time lengths at 150 DEG C, measuring and calculating A (tri) / A (on) and a melt index change rate, establishing a linear equation of the A (tri) / A (on), and calculating A '(tri) / A' (on) corresponding to 35% of the melt index change rate; carrying out thermo-oxidative aging on the sample at different time lengths, measuring and calculating A (tri) / A (on), and obtaining aging time t'according to A '(tri) / A' (on); carrying out oxidation induction time test on the thermally aged material to obtain a rate coefficient k; and calculating the aging time corresponding to the material failure critical point. The test method provided by the invention can rapidly characterize the thermal aging failure critical point of the anticorrosive coating material, and provides a scientific basis for development of the material.

The invention discloses a continuous foaming composite process for a pearl wool coiled material and a waste gas recovery system thereof, and belongs to the technical field of pearl wool processing. Aiming at the problems of low efficiency and waste gas pollution of a traditional intermittent process, the process realizes continuous production through raw material selection (the melt index of LDPE is 1.0-2.5 g / 10min), drying and mixing pretreatment, melting and plasticizing through a twin-screw extruder, injection of foaming agents such as butane under the pressure of 8-12MPa, extrusion foaming at a die head of 140-160 DEG C and combination of air-cooling and water-cooling shaping. The compounding link comprises multiple processes such as hot pressing and co-extrusion to adapt to different base materials, after-treatment is conducted through trimming, taper tension coiling and standing stress release, the product density fluctuation is + / -3%, and the peel strength is larger than or equal to 3 N / cm. According to the waste gas recovery system, negative pressure collection is conducted through a closed gas collecting hood, indirect cooling and alkali liquor spraying pretreatment are conducted, activated carbon adsorption concentration and catalytic combustion purification are conducted, the VOCs removal rate is larger than or equal to 98%, the emission concentration is smaller than or equal to 50 mg / m < 3 >, and efficient production and environmental protection benefits are achieved.

The invention provides a modified engineering plastic melt index real-time monitoring method which comprises the following steps: determining a melt index difference value of adjacent monitoring points by acquiring a melt index value of each section of an extrusion production line; obtaining the number of shearing cycles of the extrusion production line, identifying the fiber shearing damage degree of each section according to the melt index difference and the number of shearing cycles to obtain fiber damage distribution, and determining the fiber fracture position according to the fiber damage distribution; the melt index difference value corresponding to the fiber fracture position is analyzed by obtaining the melt index of the fiber fracture position, and the monitoring point interval is dynamically adjusted through the melt index difference value; and obtaining the melt index value and the fiber shortening amplitude after the interval adjustment of the monitoring points, and comparing the melt index change and the fiber length loss of each monitoring point to obtain the corresponding distribution of the fiber shortening amplitude and the melt index value.

The invention discloses an intrinsic anti-ultraviolet aging bio-based polyester elastomer and a preparation method thereof, and the preparation method comprises the following steps: under the protection of inert gas, mixing raw materials, a catalyst, lignin and an auxiliary agent according to a ratio, carrying out an esterification reaction to generate an oligomer, then carrying out a pre-polycondensation reaction under a vacuum condition, and then carrying out a final polycondensation reaction to obtain the intrinsic anti-ultraviolet aging bio-based polyester elastomer. The intrinsic anti-ultraviolet aging bio-based polyester elastomer is obtained. The bio-based polyester with high molecular weight and low melt index is prepared by utilizing a polyhydroxy structure of lignin, and the phenolic hydroxyl structure rich in lignin is utilized to provide ultraviolet aging resistance and other properties of the material, so that the problems of precipitation, poor compatibility and non-uniform dispersion of an ultraviolet aging resistant auxiliary agent after long-time use are avoided, and the 2, 4-dihydroxy-2, 4-dihydroxy-2, 4-dihydroxy-2, 4-dihydroxy-2, 4-dihydroxy-2, 4-dihydroxy-2, 4-dihydroxy-2, 4- The anti-ultraviolet aging and low melt index bio-based polyester elastomer which meets different strength and elasticity requirements and is directly prepared from 2, 5-furandicarboxylic acid, aliphatic diol, polyether glycol and lignin by a one-pot method can better adapt to market requirements, and the application field of the anti-ultraviolet aging and low melt index bio-based polyester elastomer is expanded.

The invention relates to the technical field of polymer compositions, and discloses a fiber microcrack self-healing composition with a shape memory characteristic, which comprises modified polyester containing thermally reversible dynamic covalent bonds and an asymmetric polyether-polyester block copolymer interface regulator, the melt index ratio of the interface regulating agent to the modified polyester is 1.8-3.2, and the interface regulating agent is distributed on the periphery of the modified polyester to form a core-shell microdomain. By utilizing the rheological gradient among the components, the interface regulating agent forms a low-viscosity flowing layer when the matrix shrinks; and the modified polyester is restrained to directionally migrate towards the tip of the fiber microcrack, so that active closing and densification filling of the crack area are realized, micro holes in the repaired area are eliminated, and the mechanical continuity of the composition in a dynamic environment is kept.

This invention proposes a catalyst component, catalyst, and their applications for olefin polymerization, belonging to the field of olefin polymerization technology. The catalyst component contains products obtained from the reaction of a magnesium source, a titanium source, and an internal electron donor, wherein the internal electron donor comprises furan compounds and diether compounds. The catalyst of this invention exhibits high hydrogen sensitivity and stereoregulation, with a good balance between the two. The molecular weight distribution of the prepared low melt index polymer is broader than that of the high melt index polymer, and the catalyst component of this invention does not contain phthalate compounds (plasticizers).

The invention discloses a low-temperature-impact-resistant wide-distribution injection molding grade polyethylene resin, and relates to the field of polyethylene. The polyethylene resin is composed of a high-molecular-weight polyethylene component and a low-molecular-weight polyethylene component, the melt index (MI2.16) of the polyethylene is 0.5-65 g / 10 min, the weight-average molecular weight range is 2 * 10 < 4 >-9 * 10 < 5 > g / mol, the molecular weight distribution is 2.5-50, the comonomer insertion rate is 0-10%, the impact strength at room temperature is 2-75 kJ / m < 2 >, and under the low-temperature condition of-60-0 DEG C, the melt index (MI2.16) of the polyethylene is 0.5-65 g / 10 min. The impact strength retention rate ranges from 70% to 99%. By controlling the blending distribution uniformity of the high-molecular-weight polyethylene component and the low-molecular-weight polyethylene component, the processing performance and the impact performance of the resin are balanced, and under the action of a flow field of an injection molding processing technology, the high-molecular-weight polyethylene component forms a longer-scale extended chain precursor; the low-molecular-weight component is filled in gaps of the high-molecular-weight polyethylene component to form a shish-kebab structure which is larger in size and more regular in structure, so that the aims of improving the impact strength and improving the impact strength retention rate at low temperature are fulfilled.

The invention discloses a parameter control method, device and equipment for an injection molding machine and a storage medium, and relates to the technical field of injection molding machine parameter control. The method comprises the following steps: firstly, acquiring surrounding environment temperature, material melt index and viscosity of the injection molding machine, determining three types of environment temperature adjustment amounts in combination with corresponding reference thresholds, and performing weighted correction to obtain a target environment temperature and performing control; meanwhile, pressure and flow velocity adjustment amount is determined according to the melt index and viscosity, the initial pressure and flow velocity are subjected to weighted correction to obtain second pressure and flow velocity, the injection molding pressure is controlled by combining the equipment health degree index, and compensation adjustment amount is calculated when the health degree is insufficient to obtain third pressure through weighted correction. In combination with product image detection, the flow velocity is corrected according to a notch or burr type first defect value to obtain a third flow velocity, and the pressure maintaining duration is corrected according to a surface depression type second defect value to obtain a second pressure maintaining duration; the defective rate is counted through preset duration, when the defective rate reaches the standard, the parameter optimization coefficient is adjusted according to the decreasing amplitude and the threshold value, and each weight is dynamically optimized. The method improves the product quality.

A polyethylene copolymer may comprise about 90 wt % to about 99.99 wt % ethylene and about 0.01 wt % to about 10 wt % an alpha-olefin that is not ethylene, wherein the polyethylene has: a density of about 0.930 g / cm3 to about 0.955 g / cm3, a melt flow index (2.16 kg at 190°° C.) of about 10 g / 10 min to about 50 g / 10 min, a melt flow index ratio (MIR) of about 15 to about 25, a weight average molecular weight to number average molecular weight ratio (Mw / Mn) of about 2 to about 4, a wt % of TREF elution at 90° C. and less of about 10 wt % to about 80 wt %, and a wt % of TREF elution at 95° C. and greater of about 3 wt % or more. Said polyethylene may be especially well-suited for making bicomponent fibers, which may be useful producing in nonwoven fabrics.

The invention belongs to the technical field of cable materials and preparation thereof, and discloses a high-melt-index fire-resistant cable body and a preparation method thereof.The cable body takes modified polyolefin as a matrix, and through in-situ grafting of phosphorus-containing and nitrogen-containing functional monomers, the melt fluidity of a polymer is remarkably improved; and the surface-functionalized nano-micron synergistic composite flame-retardant filler is introduced, so that efficient dispersion and synergistic interaction are realized. During preparation, the modified matrix and the composite filler are integrally extruded and molded in a twin-screw extruder to obtain a cable body with excellent fire-resistant retentivity and mechanical and electrical properties; compared with the prior art, the processing performance and the fire resistance of the material are both considered, the preparation process is simple and convenient, the energy consumption can be greatly reduced, and the fire resistance requirements in building and industrial scenes are met.

The invention relates to the technical field of preparation of carbon black master batches, and particularly discloses a high-concentration black master batch applicable to multiple substrates and a preparation method of the high-concentration black master batch. The high-concentration black master batch applicable to multiple substrates comprises the following raw material components in parts by weight: 45-60 parts of carbon black; 12 to 20 parts of polyethylene wax; 3-5 parts of calcium stearate; 10 to 15 parts of polyether amine; and 1-3 parts of an antioxidant. The black master batch is a carrier-free master batch and can be suitable for various base materials; in addition, the high-concentration black master batch suitable for multiple substrates is prepared from polyether amine synthesized by a brand new method, and has higher carbon black dispersity and higher master batch melt index. Therefore, in the specific application process, by adopting the high-concentration black master batch suitable for the multiple substrates, the problems of flow marks, color difference and the like caused by the compatibility difference between the master batch and the substrates can be thoroughly solved, and the injection molding period can be shortened.

The invention discloses an accurate temperature control method and system for regeneration and recovery of injection molding products, and relates to the field of temperature control. The method comprises the following steps: analyzing regenerated plastic components in real time through a near-infrared spectrometer, and obtaining a melt index, a thermal stability parameter and a glass transition temperature; establishing a melt apparent viscosity-temperature-shear rate three-dimensional response curved surface model in combination with a rheology theory; the method comprises the following steps: acquiring temperature gradient and pressure data by utilizing a multi-sensor network deployed in each module of a double-screw extruder, calculating an actual shear rate and melt apparent viscosity, and comparing the actual shear rate and melt apparent viscosity with theoretical values to trigger a PID (Proportion Integration Differentiation) neural network to predict temperature fluctuation so as to carry out differential temperature compensation on a feeding section and a melting section; and after each batch of production, model parameters are optimized by adopting a least square method, so that closed-loop intelligent regulation and control in the processing process of the regenerated plastic are realized. The method has the advantages that through the three-dimensional model, the PID neural network differential temperature control is combined, the temperature control problem of the regenerated plastic is solved, the quality stability of products is improved, and the waste rate is reduced.

The present invention relates to oriented, multilayer polyethylene films. In one aspect, a biaxially oriented, multilayer polyethylene film comprises: at least one inner layer comprising: (1) a polyethylene-based composition that comprises: (a) at least 97% by weight, based on the total weight of the polyethylene-based composition, of one or more polyethylenes having a density between 0.926 g / cm3 to 0.970 g / cm3 and a melt index (I2) between 0.1 to 10 g / 10 min; (b) 20 to 5000 ppm, based on the total weight of the polyethylene-based composition of a sorbitol acetal derivative comprising the structure of formula (I): wherein R1-R5 comprise the same or different moieties chosen from hydrogen and a C1-C3 alkyl.

A polyolefin bonding adhesive film includes a support base layer and a bonding adhesive layer formed on a side surface of the support base layer by co-extrusion. The support base layer is a polypropylene film. The bonding adhesive layer is formed of a first polyolefin copolymer modified by maleic anhydride. The first polyolefin copolymer is formed by copolymerization of at least two kinds of C2 to C4 olefin molecules, a first graft ratio of the maleic anhydride grafted onto the first polyolefin copolymer is between 0.5% and 5%, and a first melt index of the first polyolefin copolymer is between 3 g / 10 min and 5 g / 10 min.

The present invention relates to a polyolefin polymer, and a system and method for polymerizing same, the polymer having a density of 0.868 to 0.897 g / cm3, a melt flow index (MIE, 190°C with a load of 2.16 kg) of 0.1 g / 10 min to 20.0 g / 10 min, a PDI of 1 to 5, a number average molecular weight (Mn) of 20,000 to 70,000 g / mol, a weight average molecular weight (Mw) of 50,000 to 150,000 g / mol, and two or more melting temperatures (Tm).

This disclosure relates to ethylene interpolymer products comprising a Melt Flow-Intrinsic Viscosity Index value, MFIVI, of from ≥0.05 to ≤0.80; a first derivative of a melt flow distribution function, formula (I) at a loading of 4000 g, of from ≥−1.85 to ≤−1.51; a sum of unsaturation, SUMU, from ≥0.047 to ≤0.100 unsaturations per 100 carbon atoms; and a residual QC catalytic metal of from ≥0.03 to ≤5 ppm of hafnium. Ethylene interpolymer products comprise at least two ethylene interpolymers. Ethylene interpolymer products are characterized by a melt index (I2) from 0.3 to 500 dg / minute, a density from 0.855 to 0.975 g / cc and from 0 to 25 mole percent of one or more a-olefins. Ethylene interpolymer products have polydispersity, Mw / Mn, from 1.7 to 25; and CDBI50 values from 1% to 98%. These ethylene interpolymer products have utility in flexible as well as rigid applications.

The invention relates to the technical field of high polymer materials, in particular to a polyethylene flame-retardant master batch and a production process thereof. The polyethylene flame-retardant master batch is prepared from the following raw materials in parts by weight: 50 to 60 parts of polyethylene, 10 to 20 parts of hydroxymethyl phosphinic acid, 15 to 20 parts of HDPE-g-MAH, 0.8 to 1.5 parts of an initiator, 1 to 2 parts of an antioxidant and 3 to 6 parts of functional particles. The polyethylene is selected from high-density polyethylene, and the melt index of the polyethylene is 7-20g / 10min under the conditions of 190 DEG C and 2.16 kg; the polyethylene flame-retardant master batch produced by the invention not only can effectively enhance the flame retardant property of a polyethylene product, but also can effectively improve the anti-aging property of the polyethylene product; and the service life of the polyethylene product is prolonged to a certain extent while the quality of the polyethylene product is ensured.