402 results about "Ethylene Polymers" patented technology

The invention relates to a shielding material for a high-voltage cable, in particular to a semiconductor shielding material, a semiconductor shielding layer and a preparation method of the semiconductor shielding layer. According to the invention, a certain amount of modified carbon nanotubes are added on the basis of the raw materials of the existing polymer semiconductor shielding layer added with carbon black, and the modified carbon nanotubes are used for replacing part of carbon black, so that the polymer semiconductor shielding layer with good conductivity and high interface smoothness is prepared. The surface of the modified carbon nanotube is grafted with organic silicon and a polar ethylene polymer, so that the dispersity of the modified carbon nanotube in a polymer semiconductor shielding material system and the compatibility of the modified carbon nanotube with the resin surface are improved; the viscosity of a polymer semiconductor shielding material system under high shear strength is greatly reduced, so that the flowability of the system is greatly improved; the semi-conductive shielding material which is suitable for HV and EHV cables and has super smoothness and strong conductivity is obtained.

Polymer compositions are disclosed containing at least one high molecular weight polyethylene polymer for producing gel extruded articles. In one embodiment, porous membranes are produced that have an excellent balance of properties including high porosity and high strength characteristics. In one aspect, very thin membranes can be formed having high strength characteristics.

A rubber composition having a nitrile and ethylene terpolymer, in particular a polymer blend of an acrylonitrile-butadiene copolymer (NBR) and an ethylene polymer. The composition has an NBR in an amount of from 30 to 50% by weight of the total composition. In some embodiments, the ethylene polymer is an EPDM rubber, an ethylene acrylic elastomer, or a chlorinated polyethylene. The composition may include an organic peroxide or other accelerator. The rubber composition can be used for synchronous belts having medium temperature to high temperature resistance, good fuel resistance, flexibility as low as-40 DEG C, and high structural integrity. In addition, the rubber composition allows the amount of a reinforcing material such as carbon black to be reduced.

The invention discloses a catalyst, a preparation method and application of the catalyst in preparation of polyethylene and chlorinated polyethylene. The catalyst carrier is synthesized under a low-temperature mild condition, the catalyst has high polymerization activity, strong hydrogen regulation sensitivity and good copolymerization performance, and the ethylene polymer with narrow particle size distribution of polymerization powder, high bulk density and excellent fluidity is obtained.

The invention relates to the technical field of pearl wool composite materials, in particular to a pearl wool composite material based on an ethylene polymer and application of the pearl wool composite material in building heat preservation, the pearl wool composite material comprises the ethylene polymer, pearl wool particles and nano aerogel, the ethylene polymer is a mixture of linear low density polyethylene and metallocene polyethylene in a specific proportion, the pearl wool particles are treated by the silane coupling agent, the particle size is 0.5-2 mm, the porosity of the nano aerogel exceeds 90%, the average pore size is 2-20 nm, the components are proportioned according to specific parts by weight, the performance of the composite material is improved through the synergistic effect, and the composite material can be used in the field of building heat preservation. The composite material disclosed by the invention has the advantages of excellent thermal insulation performance, capability of effectively reducing building energy consumption, good mechanical property, high deformation resistance, long service life, good flame retardant property, capability of guaranteeing building safety, simple preparation process, low cost, wide application, capability of being used for multiple parts of a building, convenience in construction and high comprehensive benefit.

The invention discloses a method for producing multimodal polyethylene through series connection of multiple reactors, and belongs to the field of olefin polymerization. The low-molecular-weight or medium-molecular-weight ethylene polymer is produced through polymerization in the first reactor, the obtained product enters the intermediate treatment unit to remove hydrogen, and then part of the product is shunted to enter the second reactor to be mixed with the ultra-high-molecular-weight ethylene polymer produced through ethylene polymerization in the second reactor; all polymers of the second reactor are returned to the intermediate treatment unit, and the rest products after hydrogen removal enter a third reactor and are mixed with high-molecular-weight ethylene polymers generated by copolymerization of ethylene and comonomers in the third reactor to generate multimodal polyethylene. The multimodal polyethylene produced by the method is wide in molecular weight distribution, and the molecular weight of ultra-high molecular weight polyethylene is flexible to regulate and control. According to the invention, material circulation between the third reactor and the second reactor is adopted, molecular chain-level mixing among the components is achieved, the compatibility is good, and the mechanical property is more excellent.

A method for forming a high density UHMWPE film from a paste processed ultra-high molecular weight polyethylene (UHMWPE) polymer and a highly crystalline ultra-high molecular weight polyethylene polymer is provided. The UHMWPE film described herein can be produced by 1) compressing a dry porous UHMWPE tape and then stretching it above the melting temperature of the UHMWPE polymer, 2) expanding the dry porous UHMWPE tape above the melting point of the UHMWPE polymer without compression, or 3) expanding the dry porous UHMWPE tape below the melting point of the UHMWPE polymer to form a porous film, and then compressing the porous film above the melting point of the UHMWPE polymer to form a high density film. The high density film can be further biaxially stretched to enhance the properties of the high density film.

The invention discloses a rapid mass spectrum determination kit for strychnine and strychnine, and relates to the technical field of biological detection. The rapid mass spectrum determination kit comprises an MCX mixed type cationic adsorbent and a pyrrolidone-styrene polymer adsorbent. The rapid mass spectrum determination kit effectively improves the accuracy and sensitivity of detection, and through a porous plate extraction-liquid chromatography-tandem mass spectrum method, the detection sensitivity is greatly improved on a silica gel matrix C18 reversed-phase chromatographic column under the conditions of specific mobile phase composition and flow velocity. Separation of strychnine and strychnine from interference impurities in blood on a silica gel matrix C18 reversed-phase chromatographic column and multi-reaction monitoring (MRM) mass spectrometry detection under an electrospray ionization source positive ion mode are realized, and finally rapid, accurate and high-sensitivity detection of strychnine and strychnine in blood is realized.

The invention provides a bio-based spraying-free material and a preparation method thereof. The bio-based spraying-free material is prepared from the following raw materials in parts by weight: 30 to 65 parts of bio-based isosorbide polycarbonate, 15 to 25 parts of ASA (Acrylonitrile Styrene Acrylate) high rubber powder, 15 to 40 parts of acrylonitrile-styrene polymer, 0 to 10 parts of compatilizer, 0.1 to 0.5 part of antioxidant, 0.1 to 0.5 part of lubricant and 0.2 to 0.5 part of weather-resistant agent. The adopted bio-based isosorbide polycarbonate is non-toxic and has a rigid ester ring structure, the ASA high rubber powder and the acrylonitrile-styrene polymer provide flexibility and impact resistance, and through a rigid-flexible molecular chain structure, the impact resistance is good while the strength and hardness are maintained; besides, through the synergistic effect of all the components, while the bio-based source and environmental friendliness are maintained, the composition also has excellent heat resistance, aging resistance and weather resistance, and can meet the requirements of automobile exterior decorations.

Polymer compositions containing an ethylene polymer, 50-1500 ppm by weight of a glycerol stearate, and 250-7500 ppm by weight of an antioxidant selected from a phenolic antioxidant, a phosphite antioxidant, a thioester antioxidant, or any combination thereof, are described. These polymer compositions have improved initial color, improved color after long-term aging, or improved color after multi-pass extrusion processing.

The present invention relates to a polypropylene composition comprising (A) from 80.0 to 99.0 wt.-% of a copolymer of propylene and comonomer units selected from ethylene and alpha-olefins having from 4 to 12 carbon atoms having a total amount of comonomer units of from 10.0 to 16.0 wt %, based on the total amount of monomer units of the copolymer of propylene (A); a melt flow rate MFR2 of from 0.5 to 2.5 g / 10 min; a xylene cold soluble (XCS) fraction in a total amount of from 25.0 to 50.0 wt %, based on the total weight amount of the copolymer of propylene (A); and (B) from 1.0 to 20.0 wt.-% of an ethylene polymer having a density of from 915 to 960 kg / m3; and a melt flow rate MFR5 (190° C., 5 kg) of from 0.05 to 5.0 g / 10 min, an article comprising said polypropylene composition, preferably a cable comprising an insulation layer comprising said polypropylene composition, and the use of said polypropylene composition as cable insulation for medium and high voltage cables.

The invention relates to the technical field of pearl wool composite materials, in particular to a polyethylene polymer environment-friendly pearl wool composite material and a preparation method thereof.The polyethylene polymer environment-friendly pearl wool composite material comprises, by weight, 40-70 parts of polyethylene polymer, and HDPE, MDPE and LLDPE are mixed according to a specific proportion; carrying out plasma treatment on 20-50 parts of pearl wool particles to introduce polar groups; the environment-friendly plasticizer is formed by compounding TBC and ATBC; 5-15 parts of degummed natural plant fibers for enhancing the binding force; 1-5 parts of nano titanium dioxide can be used for photocatalytically degrading pollutants; the 0.5-3 parts of antistatic agent is compounded by GMS and EAA, so that static accumulation is reduced; all the components have a synergistic effect, so that the material has various excellent properties. The composite material disclosed by the invention is good in environmental protection property, and air can be purified by using the environment-friendly plasticizer, the natural fibers and the nano titanium dioxide; the performance is excellent, and the buffering performance, the antistatic performance, the heat preservation performance and the flame-retardant performance are good. The preparation process is stable and efficient, can meet the requirements of multiple fields such as packaging, building and automotive trim, and has a wide prospect.

A process for preparing a solid catalyst component containing Mg, Ti, and an internal electron donor formed in-situ is provided. The solid catalyst component is suitable for producing polyethylene and its copolymers, and said process shows a combination of high productivity and high bulk density of ethylene polymers, lower soluble fraction, uniform particle morphology, and adjustable control of molecular weight distribution to allow controlled improvement in product properties as per specific requirements.

The invention provides a polyolefin composite material as well as a preparation method and application thereof, and the polyolefin composite material comprises the following components in parts by weight: 20-50 parts of an ethylene polymer, 40-52 parts of an inorganic filler, 0.1-5 parts of a blocking agent, 0.2-1.8 parts of epoxy resin and 0.2-2 parts of an antioxidant. According to the invention, the polyolefin composite material resists precipitation of an auxiliary agent and has good thermo-oxidative aging performance; therefore, the cable comprising the polyolefin composite material can be used in severe environments and weather.

The invention relates to a thienylethene polymer, the thienylethene polymer has a chemical structure as follows: R1 and R2 are respectively and independently selected from hydrogen, substituted or unsubstituted C6 to C20 straight chain or branched chain alkyl, alkoxy or alkylthio, and R1 and R2 are respectively and independently selected from hydrogen, substituted or unsubstituted C6 to C20 straight chain or branched chain alkyl, alkoxy or alkylthio; x1, X2 and X3 are independently selected from a chlorine atom or a fluorine atom; and n represents the degree of polymerization and is a natural number between 2 and 1000. Compared with the existing thienylethene polymer with the same main chain, the improved thienylethene polymer disclosed by the invention can effectively improve the photoelectric conversion efficiency and open-circuit voltage of a photovoltaic device.

Expandable styrene polymers comprising polymeric brominated flame-retardant, wherein the polymeric brominated flame-retardant comprises at least one brominated polybutadiene block having a bromination degree between 33 and 75%, based on the double bonds in the polybutadiene block before bromination, a process for producing such expandable styrene polymers by suspension polymerization and particulate foam moldings made therefrom.

The objective is to provide polyethylene resin that minimizes the leaching of contaminants such as elutes and degraded materials when used as a container for semiconductor cleaning chemicals. [Solution] Density of 0.960~0.970 g / cm³ 3 A low molecular weight ethylene-based polymer with a density of 0.920-0.940 g / cm³ 3 A polyethylene resin comprising two components of a high molecular weight ethylene polymer, wherein the weight ratio of the two components is 40:60 to 60:40, and having specific properties.

A process for preparing an ethylene polymer in a suspension polymerization including the steps of separating the formed suspension of ethylene polymer particles in a solid-liquid separator into ethylene polymer particles and mother liquor, transferring a first part of the mother liquor into a work-up section including an evaporation unit for producing a wax-depleted portion of the mother liquor, wherein a protic agent is added to the part of the mother liquor which is transferred into the work-up section, and recycling a first part of the wax-depleted portion of the mother liquor to the polymerization reactor or the series of polymerization reactors.

A process for preparing an ethylene polymer in a suspension polymerization including the steps of separating the formed suspension of ethylene polymer particles in a solid-liquid separator into wet ethylene polymer particles and mother liquor, transferring a part of the mother liquor into a work-up section including an evaporator for producing a wax-depleted portion of the mother liquor, a diluent distillation unit for producing isolated diluent from the wax-depleted portion of the mother liquor, and a wax removal unit operated by direct steam distillation for producing a gaseous hydrocarbon / steam mixture which is condensed and then separated into an aqueous phase and a hydrocarbon phase, wherein a first part of the hydrocarbon phase is transferred to the diluent distillation unit without passing the evaporator for producing the wax-depleted portion of the mother liquor.

An ion exchange-functionalized poly(chlorotrifluoroethylene) (PCTFE) polymer molecule includes a PCTFE main chain and a side group that includes an ion exchange group and a linker that links the ion exchange group to the PCTFE main chain.

The present invention relates to a catalyst composition comprising: catalyst component A comprising the meso form of a bridged metallocene compound with two indenyl groups, each indenyl being substituted with one or more substituents, wherein at least one of the substituents is an aryl or heteroaryl; wherein the meso / rac ratio of the meso form of the bridged metallocene compound of catalyst component A is 95:5 or greater; catalyst component B comprising a bridged metallocene compound with a substituted or unsubstituted cyclopentadienyl group and a substituted or unsubstituted fluorenyl group; and an optional activator; an optional support; and an optional co-catalyst. The present invention also relates to a polymerization process using said composition. The invention further relates to olefin polymers at least partially catalyzed by said catalyst composition and articles comprising said olefin polymers. The present invention also relates to a metallocene-catalyzed ethylene polymer having: a melt index MI2 ranging from 0.1 g / 10 min to 12.0 g / 10 min wherein MI2 is determined according to ISO 1133:2005 Method B, condition D, at a temperature 190° C. and a 2.16 kg load using a die of 2.096 mm; a molecular weight distribution Mw / Mn, ranging from 4.0 to 12.0, with Mw being the weight-average molecular weight and Mn being the number-average molecular weight; a rheology long chain branching index grheo of at least 0.90, preferably at least 0.93, preferably at least 0.95; and preferably at least 0.30% by weight of ethyl branching with regard to the total weight of the ethylene polymer measured by 13C NMR, with the proviso that said ethyl branching is not generated from 1-butene incorporation as comonomer.

The invention relates to a curable composition comprising (a) at least one ethylene polymer, (b) less than 2 parts by weight of at least one monoperoxycarbonate per 100 parts by weight of component (a), (c) 0.4 to less than 4 parts by weight of at least one tertiary alkyl hydroperoxide per 100 parts by weight of component (b). The invention further relates to a method for preventing scorching of a curable composition comprising an ethylene polymer by adding a specific amount of a tertiary alkyl hydroperoxide to the curable composition and a method for preparing a scorch resistant material.

Nonwoven fabrics are provided that include a plurality of crimped bicomponent fibers having a first component comprising a first polymeric material comprising a first polymer or a first polymeric blend and a second component comprising a second polymeric material, in which the second polymeric material comprises a second polymeric blend of (i) at least one polypropylene polymer, (ii) at least one polyethylene polymer, and (iii) at least one compatibilizer comprising or consisting of at least one polypropylene-polyethylene copolymer.

The present disclosure relates to polyethylene polymers and films made therefrom. In some embodiments, the polyethylene copolymer comprises 90 wt% or more ethylene units and the balance of C3-C20 comonomer units. The polyethylene copolymer has a bimodal composition distribution, a density of from about 0.914 g / cm3 to about 0.925 g / cm3, a melt index of from about 0.1 g / 10 min to about 1 g / min, a high load melt index (HLMI) of from about 1 or 12 g / 10 min to about 30 g / 10 min, a melt index ratio (MIR) of from about 30 or 35 to about 60 or 65, and a molecular weight distribution (MWD) of from about 3 or 4.5 to about 7 or 7.5. The copolymers may also exhibit a bimodal compositional distribution such as a combination of a wide orthogonal compositional distribution (BOCD) and a long chain branching (LCB).

A process for preparing an ethylene polymer in a suspension polymerization including the steps of separating the formed suspension of ethylene polymer particles in a solid-liquid separator into wet ethylene polymer particles and mother liquor, drying the wet ethylene polymer particles by a gas stream and forming a gas stream carrying a hydrocarbon load, and thereafter separating the hydrocarbon load from the gas stream and thereby forming a liquid hydrocarbon recover stream, transferring a part of the mother liquor into a work-up section including an evaporator for producing a wax-depleted portion of the mother liquor and a diluent distillation unit for producing isolated diluent from the wax-depleted portion of the mother liquor, wherein a first part of the hydrocarbon recover stream is transferred to the diluent distillation unit without passing the evaporator for producing the wax-depleted portion of the mother liquor.

The application discloses a light reflection and enhancement film and an enhanced photovoltaic module with the same, the light reflection and enhancement film comprises a buffer layer and a substrate layer, the preparation raw materials of the buffer layer comprise an ethylene polymer, a mesoporous composite material, a filler and an additive, and the preparation raw materials of the substrate layer comprise a propylene polymer alloy, the mesoporous composite material, the filler and the additive. The light reflection and enhancement film and the enhanced photovoltaic module with the same have the advantages that the mesoporous material is compounded with the nanometer material to form the mesoporous composite material, and then the mesoporous composite material is used for preparing the buffer layer and the substrate layer, so that the reflectivity of the ultraviolet region of 330-380 nm, the adhesion between the buffer layer and the battery and the adhesion between the substrate layer and the adhesive film are improved, the light reflection and enhancement film is applied to the gap position between the battery pieces on the photovoltaic battery, the battery hidden crack and the fragments can be avoided, and the module power can be greatly improved compared with the application on the glass.

The present disclosure relates to catalysts, polyethylene polymers, polymerization processes for making such polyethylene polymers, and films made therefrom. In some embodiments, the catalyst system includes a first catalyst compound. The first catalyst compound is represented by formula (I). At least one pair of R4 and R5, R5 and R6 or R6 and R7 of formula (I) is linked to form a first substituted or unsubstituted fully saturated ring fused to the indenyl ring, and at least one pair of R11 and R12, R12 and R13 or R13 and R14 is linked to form a second substituted or unsubstituted fully saturated ring fused to the indenyl ring. The catalyst system further includes a second catalyst represented by formula (III). At least one pair of R7 and R8, R8 and R9, or R9 and R10 of formula (III) is linked to form a substituted or unsubstituted fully saturated ring fused to the indenyl ring.

Poly (catechol-styrene) (PCS) is a novel material having a variety of industrial and biomedical uses. For example, PCS acts as a binder that acts in a humid or underwater environment, and thus can be used in biomedical applications. The present disclosure provides a method of forming a poly (catechol-styrene) polymer. The method includes the step of polymerizing 3, 4-diacetoxystyrene and styrene in an emulsion polymerization to form a poly (3, 4-diacetoxystyrene-co-styrene) polymer. The polymer has acetate groups deprotected from an alcohol, thereby forming a poly (catechol-styrene) polymer. The poly (catechol-styrene) polymer has improved strength at a higher molecular weight.