7862 results about "Poly ethylene" patented technology

The present invention provides compositions comprising polytheylyene-dialkyloxypropyl conjugates (PEG-DAA), liposomes, SNALP, and SPLP comprising such compositions, and methods of using such compositions, liposomes, SNALP, and SPLP.

The invention discloses an alpha-nickel diimine compound olefin polymerization catalyst and a preparation method thereof, and a method for preparing branched polyethylene. Structural formulas of the alpha-nickel diimine compound olefin polymerization catalyst are shown as a formula (I) and a formula (II), and the preparation method of the alpha-nickel diimine compound olefin polymerization catalyst is simple and low in cost, and can catalyze ethylene polymerization with high activity at a temperature of more than or equal to 80 DEG C to obtain high molecular weight polyethylene. The polyethylene prepared by catalyzing of the alpha-nickel diimine compound olefin polymerization catalyst has high molecular weight, and can prepare molecular weight which reaches more than 10<2>*kg/mol in the temperature range of between 0 and 80 DEG C.

The invention discloses a high-resilience chemical crosslinked polyethylene foam material and a preparation method thereof. The material mainly comprises the following components by weight: 50-100 parts of polyethylene resin, 0.1-50 parts of elastomer, 5-50 parts of foaming agent, 0.1-5 parts of cross-linking agent, 0.1-10 parts of foaming assistant, and 0.1-5 parts of cross-linking assistant; the components are internally mixed, pelletized, mixed, extruded, and formed into non-cross-linking extruded master slices, and then the master slices are cross-linked and foamed by heating. According to the invention, the elastomer is mixed into PE (poly ethylene) resin to form the foam material, so the resilience of the product is high; meanwhile, the product further has high elongation at break and tensile strength, excellent toughness, and stable chemical and physical properties, so that the product can be widely used in the fields of packaging, sports and protection, transportation and the like.

The invention discloses an olefin polymeric catalyst and preparing method and reacting technology, which is characterized by the following: the expression formula of catalyst is [SiO2-Cat], wherein Cat represents semi-sandwich homogeneous phase catalyst of transient element metallic titanium (IV) or zirconium (IV); SiO2 represents dielectric molecular sieve SBA-15 decorated by methyl alundum alkyl, which can synthesize polyethylene; the catalyst possesses high ethylene polymeric activity, which displays ultrahigh molecule with different patterns.

The invention discloses a preparation method of a hydrophilic antimicrobial film of which the surface is coated with dopamine and polyethyleneimine cations. The preparation method comprises the following steps that a base film is prepared, the base film is immersed in a dopamine solution, a polydopamine layer is formed on the surface of the base film by dopamine auto-agglutination, and the polydopamine layer and a polyethyleneimine aqueous solution undergo a reaction so that the hydrophilic antimicrobial film is prepared by the cationization reaction. The preparation method is simple and easy and has mild reaction conditions. The prepared hydrophilic antimicrobial film has excellent hydrophilicity and antibacterial properties, reduces adherence of microbes such as organic matters and bacteria, has a bacterium killing capability and prolongs a film service life.

The invention belongs to the field of road engineering, and particularly relates to a hyperviscous and high-elastic asphalt modifier applicable to steel bridge deck pavement. The asphalt modifier comprises the following raw materials in parts by weight: 3-10 parts of junked tire rubber powder, 3-10 parts of polyethylene wastes, 3-8 parts of styrene-butadiene-styrene block copolymer, 1-5 parts of styrene-isoprene-styrene block copolymer, 1-5 parts of terpene resin, 5-10 parts of solvent naphtha, and 0.3-0.7 part of alcohol ether carboxylate adhesion agent. In addition, a modified asphalt and amodified asphalt mixture are prepared on the basis of the modifier, the 60 DEG C dynamic viscosity of the modified asphalt prepared by applying the modifier can reach more than 300000Pa.s, and the performance grading reaches PG 88-28; and the asphalt mixture has favorable water stability, higher dynamic modulus, higher track dynamic stability and low temperature failure strain, and can resist complicated mechanics and temperature environment of a steel bridge deck.

An implantable prosthetic bearing is constructed of a composite material having a first layer and second layer. The first layer has an articulating surface defined therein, whereas the second layer has a engaging surface defined therein for engaging either another prosthetic component or the bone itself. The first layer of the implantable prosthetic bearing is constructed of a polymer such as polyethylene or UHMWPE, whereas the second layer is constructed of a copolymer of ethylene and an acrylate. The ethylene portion of the copolymer provides for adhesion to the polymer of the first layer, whereas the acrylate portion of the copolymer provides for adhesion to commonly utilized bone cements. A method of making a prosthetic bearing is also disclosed.

The invention discloses a polybutene alloy material and a preparation method thereof, and belongs to the field of polyolefin material, specifically relates to a polybutene alloy material and a preparation method thereof. The polybutene alloy material provided by the present invention comprises, by mass, 50-99% of poly-1-butene, 1-40% of polypropylene and 0-10% of a butane-propylene copolymer. Thepreparation method is characterized by: adopting a TiCl4/MgCl2 supported titanium catalyst for synthesis of the polybutene alloy material through a two-phase polymerization method. The polybutene alloy material provided by the present invention has a core-shell structure, and has advantages of the combination of the excellent impact resistance of the poly-1-butene, the heat resistance and creep property of the poly-1-butene, the low shrinkage rate of the poly-1-butene, the high modulus of the polypropylene, the high surface hardness of the polypropylene, the rapid shaping of the polypropylene, and the like, such that the polybutene alloy material can replace the partial use of the poly-1-butene and the polypropylene. In addition, the polybutene alloy material can be applicable for preparation of the pipe and the pipe fitting, toughening modification of the polypropylene, or the polybutene alloy material can be used as the general polyolefin material.

The invention discloses an insulating and sheathing material of ultraviolet light crosslinking expanding type phosphorus nitrogen flaming resistance polyolefine cables and a preparation method thereof. The invention is characterized in that polyethylene/PEMA and/or ethylene vinyl acetate or maleic anhydride grafted ethylene vinyl acetate or acid amide grafted ethylene vinyl acetate copolymer are taken as base, added with expanding type phosphorus nitrogen halogen-free flame retardants, light trigger, polyfunctional group cross linker and chemical inhibitor and matched with flaming retardant synergistic agent, antismoke agent and processing aid, and then squeezed out and pelleted into photo-crosslinking flame retardant cable materials; and then the flame retardant cable materials are melted and extruded on a cable conductor wire core and clad into an insulating layer and a sheathing layer; hereupon the ultraviolet light irradiation crosslinking is carried on the insulating layer or the sheathing layer. Via detecting, the oxygen index of the insulating layer or the sheathing layer is larger than 30%, the vertical flaming experiment passes through UL-94 V0 level, the tensile strength is larger than 12Mpa, the elongation at break is larger than 350%, and the electric volume resistivity is larger than 8*10 omega.cm.

The invention discloses a loading metallocene catalyst composition which is obtained through adopting an alkyl aluminoxane/magnesium chloride/silica gel carrier as a carrier and loading a metallocene catalyst precursor, and a preparation method thereof. The catalyst system consisting of the catalyst composition catalyzes ethylene to polymerize or copolymerize and has high polymerization activity. Compared with a common loading metallocene catalyst with an alkyl aluminoxane/silica gel carrier, the activity can be doubled or more. The carrier is simple to prepare; the prepared loading catalyst granule has good shape and adjustable size; and the obtained polythene powdery material has high stacking density.

Multilayer laminated shrink films that have good interlayer adhesion comprise at least three layers, a first layer comprising a polymer selected from the group consisting of polyamides, ethylene vinyl alcohol copolymers and mixtures thereof, a second adhesive layer consisting essentially of a blend of a functionalized polymer component, an ethylene copolymer component and a tackifier and a third layer comprising a polymer selected from the group consisting of polyethylene homopolymers, ethylene copolymers, polypropylene homopolymers, propylene copolymers, polyesters, polyamides, polyvinyl chloride, polycarbonates, and mixtures thereof The adhesive layer is positioned between and contacts the first and third layers.

The invention discloses a domino catalyzing system of a primary metallocene catalyst, which takes ethane as a sole monomer to prepare branched polyethylene, and the application thereof, which relates to vinyl copolymer. the catalyzing system is a compound catalyzing system consisting of the single primary metallocene catalyst and two different catalyst promoters, wherein, the primary catalyst is a metallocene catalyst with a structural formula of Cp<1>MR<1>R<2>R<3>, Cp<1>Cp<2>MR<1>R<2> or Cp<1>-D-Cp<2>MR<1>R<2>; alkyl aluminium acts as an oligomerization catalyst promoter; methylaluminoxane or triisobutyl aluminium or triethyl aluminum that is not used together with the oligomerization catalyst promoter acts as a copolymerization catalyst promoter; the mole ratio between the oligomerization catalyst promoter and the primary catalyst is 10-1000 to 1, and the mole ratio between the copolymerization catalyst promoter and the primary catalyst is 20-1000 to 1. The catalytic activity of the metallocene domino catalyzing system for preparing the branched polyethylene is 5 multiplied by 10<5> to 5 multiplied by 10<7>gPE/(molM per hour), the degree of branching is 10-200/1000C, the molecular weight of the branched polyethylene prepared under the effect of the catalyzing system ranges from 1 multiplied by 10<5> to 4 multiplied by 10<5> and the melting point is below 120 DEG C or even no melting point exists.

The invention discloses a preparation method of a nanofluid for improving oil recovery. The preparation method comprises the following steps: taking 2.0-4.0g of nanopowder, adding 60-80mL of deionized water to the nanopowder and carrying out ultrasonic dispersion at a room temperature for 30-60 minutes; dissolving 2.0g of a silane coupling agent in absolute ethyl alcohol; mixing the nano-base solution with the ethanol solution of the silane coupling agent in a three-neck boiling flask, heating while stirring to the range of 70 to 75 DEG C, reacting for 4-6 hours, filtering, washing by using an anhydrous solvent a plurality of times, and drying in a vacuum drying box at 60-70 DEG C for 12 hours to obtain modified nanoparticles; putting 0.1-0.5g of nanoparticles in the three-neck boiling flask, adding 200-300mL of water, heating to the range of 60-75 DEG C by use of a water bath, mixing a surfactant with PEG (Poly Ethylene Glycol), adding 100mL of mixed solution of the surfactant and the PEG, mechanically stirring for 6-8 hours, washing the stirred dispersion 2-3 times, adjusting the pH value to the range of 8-9, and adding deionized water to 1L, thereby obtaining the water-based nanofluid.

A liquid laundry detergent for improved grease and oil cleaning having a lipase enzyme, a modified polyethyleneimine polymer and a liquid carrier.

The invention discloses a cold-resistant rubber cable sheath material and a preparation method. The material comprises chlorinated polyethylene, ethylene-propylene-diene monomer (EPDM) rubber, lead oxide, calcium carbonate, N-isopropyl benzene-N'-phenyl p-phenylenediamine serving as an anti-aging agent, antimonous oxide, magnesium oxide, paraffin hydrocarbon oil, chlorinated paraffin, paraffin, carbon black, settled white carbon black, talc powder, gamma-aminopropyl triethoxysilane serving as a surfactant, dicumyl peroxide serving as a vulcanizing agent and triallyl isocyanurate serving as a co-vulcanizing agent. The low temperature performance of the material is improved by blending the chlorinated polyethylene and the EPDM rubber, and meanwhile, the flame-retardant performance of the rubber sheath material is improved by synergy of the antimonous oxide serving as a flame retardant and the chlorinated paraffin; experiments show that the rubber sheath material can pass low-temperature embrittlement test of 40 DEG C below zero, has excellent low-temperature resistance, has the oxygen index of more than 32 and has good flame-retardant performance; and the preparation method is simple and strong in operability.

A high molecular weight polyethylene prepared by preliminary polymerization is added at the time of main polymerization of an olefin, for example, propylene, to prepare an olefin (co)polymer composition comprising the above high molecular weight polyethylene finely dispersed as fine particles in the polyolefin, such as polypropylene, and a cross-linked structure is formed in the olefin (co)polymer composition. This process can provide a modified olefin (co)polymer composition improved in the strength in a molten state in terms of melt tension or the like and in crystallization temperature and excellent in moldability such as high-speed producibility, and a molded modified olefin (co)polymer composition excellent in properties such as heat resistance and rigidity.