74 results about "Conventional polyethylene" patented technology

A transesterification process of methyl acetate is provided. The process comprises: (a) performing a first reactive distillation of a methyl acetate solution and a first alcohol to generate a first ester and a first mixture; (b) performing a first distillation of a first part of the first mixture to generate a second mixture; and (c) performing a second reactive distillation of a first part of the second mixture and a second alcohol to generate a second ester; wherein the respective one of the first and second alcohols is a limiting reagent. The transesterification process provided in the present invention could highly reduce the investing production cost of the transesterification of the by-product, methyl acetate, in the conventional polyvinyl alcohol plants.

Polymer blends are disclosed that comprise one or more polybutadiene homopolymers or copolymers having at least one functionality capable of entering into condensation reactions; one or more polyethylene terephthalate homopolymers or copolymers obtained using a catalyst system comprising aluminum atoms and one or more alkaline earth metal atoms, alkali metal atoms, or alkali compound residues, optionally obtained by a melt-phase polymerization process; and one or more transition metal atoms. The blends are useful for packaging, and exhibit improved oxygen-scavenging activity compared with blends made using many conventional polyethylene terephthalate polymers prepared with conventional catalyst systems.

Laminated films comprising at least one structural layer, at least one adhesive layer and optionally at least one barrier layer made by a high speed or fast quench film process, where the adhesive compositions are blends of acid-grafted substantially linear polyethylenes and conventional-linear polyethylene homopolymer or copolymer or low density polyethylene.

The invention discloses a boron nitride-polyethylene space radiation protection composite material and a preparation method of the boron nitride-polyethylene space radiation protection composite material.The invention relates to a polyethylene space radiation protection composite material and a preparation method of the polyethylene space radiation protection composite material. The invention is used for solving the technical problem that the conventional polyethylene for preparing the space radiation protection material has low thermal stability and low efficiency of filtering protons with pure aluminum in the same mass and thickness. The preparation method disclosed by the invention comprises the following steps of: adding ethanol and boron nitride into a container, then, adding a coupling agent, and reacting in constant temperature water, so as to obtain modified boron nitride, and finally, adding the polyethylene and the boron nitride into a high mixing machine, so as to obtain the boron nitride-polyethylene space radiation protection composite material. The boron nitride-polyethylene composite material prepared with the preparation method disclosed by the invention has a thermal degradation temperature of 430-520 DEG C and high thermal stability, compared with the pure aluminum, efficiency of filtering the protons can be increased for almost 0.4-1 times, an integrated performance is excellent, and the boron nitride-polyethylene space radiation protection composite material has a wide application prospect in radiation protection of spacecrafts.

The invention discloses a perforated corrugated plate attachment apparatus for culturing sea cucumbers. The invention is characterized in that: the conventional polyethylene corrugated plate is provided with dense through holes which are in circular, square or rhombic or combined forms; the through holes are positioned at grooves of corrugated plates, and are distributed regularly or irregularly at the intervals 3-8 centimeters; the hole diameters of the through holes are 1.0-5.0 millimeters; the sum of the areas of all through holes is not lower than 5 percent of the surface area of the corrugated plate and not higher than 10 percent of the surface area of the corrugated plate; and the through hole overlapping rate of every two corrugated plate does not surpass 10 percent.

The invention relates to a preparation method of a nanoporous high-efficiency heat-insulating polyethylene film, by which the nanoporous high-efficiency heat-insulating polyethylene film is prepared from nanometer aerogel powder as an inorganic filler and polyethylene powder as a main raw material. The preparation process comprises the following main steps: performing surface modification on the nanometer aerogel powder, preparing masterbatch, casting the film and the like. Through certain technical characterization, the fact that the nanometer aerogel powder is uniformly dispersed in a polyethylene matrix is proved. Compared with the conventional polyethylene film, the nanoporous high-efficiency heat-insulating polyethylene film provided by the invention has the advantages as follows: theheat conductivity of the nanoporous high-efficiency heat-insulating polyethylene film doped with 3% of the aerogel powder is decreased by 26.1%, and the tensile strength and the elongation at break are not changed too much. Decrease in the heat conductivity indicates increase in heat-preserving and heat-insulating properties of the film, so that the film prepared by the preparation method provided by the invention has a very good application prospect in the field of heat preservation and heat insulation.

The present invention relates to a plastic packaging material for injection powder and a preparation process thereof, and belongs to the field of pharmaceutical packaging materials. The plastic packaging material has a three-layer structure comprising an inner layer, a middle layer and an outer layer. The inner layer and outer layer are made from the following components by weight: 5-15% of mVLDPE, 10-25% of mLLDPE, 25-45% of LLDPE and 40-60% of LDPE; and the middle layer is made from the following components by weight: 5-15% of mLLDPE, 20-40% of LLDPE and 45-75% of LDPE. The plastic packaging material provided by the present invention has good toughness, high transparency, low heat viscosity low heat sealing temperature and small odor, and performances superior to conventional polyethylene products; the plastic packaging material has excellent anti-impact resistance and resistance to environmental stress cracking at room temperature or even at a low temperature of -80 DEG C, excellent barrier properties and tearing strength. The invention provides a better securer choice with higher quality for aseptic pharmaceutical production and packaging.

Disclosed is a method of copolymerizing polyethylene glycol (PEG) into polyethylene terephthalate (PET) to achieve a polyethylene glycol-modified polyester composition that can be spun into filaments. The method includes the steps of copolymerizing polyethylene glycol into polyethylene terephthalate in the melt phase to form a copolyester composition, then polymerizing the copolyester composition in the solid phase until the copolyester is capable of achieving a melt viscosity that facilitates the spinning of filaments, and thereafter spinning filaments from the copolyester. A copolyester composition comprised of polyethylene glycol and polyethylene terephthalate is also disclosed. Fabrics made from fibers formed from the copolyester composition possess wetting, wicking, drying, flame-retardancy, static-dissipation, and soft hand properties that are superior to those of fabrics formed from conventional polyethylene terephthalate fibers of the same yarn and fabric construction.

Microfine low density polyethylene powders are provided. The powders are comprised of spherical or substantially spherical particles having an average particle size of 5 microns or less produced by a dispersion process. The powders, by virtue of their relatively high molecular weights compared to conventional polyethylene waxes, have a useful balance of physical properties.

The invention discloses a high-density polyethylene alloy pipe and a manufacturing method thereof. High-density polyethylene 100 (HDPE 100) is used as base resin, high-density polyethylene-g-maleic anhydride (HDPE-g-MAH) is used as a compatilizer, calcium carbonate (CaCO3) and low-density polyethylene (LDPE) are added into the base resin and the compatilizer, and the mixture is blended with modifier polyamide 6 (PA6) to form a modified polyethylene (PE) alloy product. The method comprises the main operation steps of: (I) preparing HDPE modified granules; and (II) adding the modifier PA6, performing high-speed mixing to form a modified PE mixture, and extruding the modified PE mixture into the product in an extruder. According to the technical scheme, the high-density polyethylene alloy pipe overcomes the defects the defects that the conventional polyethylene resin has low tensile strength, poor rigidity and poor abrasion resistance, chemical resistance, environmental stress cracking resistance and heat resistance, has insufficient blocking property on hydrocarbon solvents and fuel oil, is easily damaged by ultraviolet under the irradiation of sunlight, seriously affects the service life of the product and the like; and the high-density polyethylene alloy pipe is suitable to be used as various heat resistant, abrasion resistant and temperature resistant pipes, and is particularly suitable for pipeline transportation of special industries of drainage, fuel gas and fuel oil delivery, chemistry and chemical industry and the like.

The embodiment of the invention provides a halogen-free flame-retardant low-density polyethylene material, and a preparation method and an application thereof. According to the halogen-free flame-retardant low-density polyethylene material, the flame retardant grade reaches the UL94 V-2 grade; no corrosive gas is generated during combustion; the self-extinguishing property is good, the elongationat break reaches up to 175%, the impact strength reaches 411 J/m, a product is good in flexibility and has no pricking on hands due to touch, favorable resilience, recyclability, environment friendliness and no halogen, and the problem that a conventional polyethylene material cannot satisfy the simulation decoration industry and plug inner film application requirements in the prior art is solved.

The invention relates to a polyvinyl alcohol film which is prepared by a raw material containing modified polyvinyl alcohol. The modified polyvinyl alcohol has a polymerization degree of 1000-3000 andan alcoholysis degree of 80-99.9 (mol) percent; a modified polyvinyl alcohol molecule contains -COONa group, and the content of the -COONa group is 0.01-3.0 (mol)/kg.PVA. The polyvinyl alcohol film prepared by the invention is good in acid and alkali resistance, good in stretchability and capable of resisting a chloride ion environment, has obvious advantages in the application fields such as packaging of weakly-alkaline liquid detergents, packaging of weakly-acidic or weakly alkaline drugs and packaging of pesticides with chloride ions compared with a conventional polyvinyl alcohol film. Thepolyvinyl alcohol film provided by the invention in simple in preparation method and suitable for industrial production.

Methods and apparatus for decontaminating disposable protective products prepared from polyvinyl alcohol (PVA), used in a nuclear power plant, to less than minimum detectable activity (MDA) are disclosed. In the disclosed methods and apparatus, solid protective products made of PVA, generated from a nuclear power plant, are dissolved into a liquid, and then are decontaminated to less than MDA. The PVA solution decontaminated in this way is concentrated to an appropriate concentration or dried, and finally is subjected to self-disposal. This can fundamentally block the generation amount of combustible waste amounting to 50% or more of low and intermediate level waste of nuclear power plants, thereby considerably contributing to a reduction of the operating expenses of the nuclear power plants. The present invention further relates to methods and apparatus for self-disposing disposable protective products manufactured by conventional polyvinyl alcohol (PVA) through pyrolysis/catalytic oxidation of a PVA solution generated by concentration, and treating the decontaminated PVA solution within a plant. The PVA protective products are dissolved/concentrated/oxidized in water to remove firstly organic matter, and then PVA materials in the PVA solution are completely oxidized into CO₂ and H₂O by using a small-sized pyrolysis/catalytic oxidation reactor.

The present invention relates to a high-density ethylene-based polymer and a pipe using the same, the high-density ethylene-based polymer including: an ethylene homopolymer; or a copolymer of ethylene and at least one comonomer selected from the group consisting of an α-olefin, a cyclic olefin and linear, branched and cyclic dienes.

The pipe using the high-density ethylene-based polymer of the present invention has more superior strain hardening than a conventional polyethylene resin pipe, and thus has excellent long-term pressure resistance characteristics and processability.

The invention provides a preparation method for high-strength cosmetic bottles. According to the method provided by the invention, an inorganic additive is added into conventional polyethylene, so that the high-strength performance of the material is effectively improved, and the preparation process is relatively simple; the preferred inorganic additive is added into a PE plastic, so that a volumeof the plastic product can be increased, the costs can be reduced, the hardness and rigidity can be improved, the shrinkage of the plastic product is reduced, and the dimensional stability is improved; aluminum oxide, silicon tetrafluoride and graphene are added, so that the processing properties of the plastic is improved, and the high strength performance is improved; and the method has obviouseffects in expansion of an application range of the polyethylene.

A low gloss capstock compound is disclosed. The combination of gloss inhibiting agents, metal-based ionomer thermoplastic resins, and acid scavenger added to conventional polyethylene polymer resin achieves a gloss angle at 85° of below 10 GU. Optionally, the compound can also include weathering agents to improve outdoor durability. The compound can be fully formulated or a masterbatch for let-down into polymer to form the fully formulated compound.

The invention discloses a high-toughness polyethylene plastic pipe and a preparation method thereof. Through dodecylbenzene sulfonic acid, dissolution of 8-hydroxyquinoline can be better promoted, 8-hydroxyquinoline and generated 8-hydroxyquinoline copper can be better dispersed, the agglomeration phenomenon of the 8-hydroxyquinoline copper is reduced, the chemical activity and mildew resistance of the 8-hydroxyquinoline copper are improved, and the toughness of the prepared polyethylene plastic pipe is improved; polyethylene naphthalate has low water vapor transmission rate, and can endow polyethylene with excellent low water vapor transmission performance. According to GB/T 19810-2005, the tensile strength of prepared modified polyethylene particles is 45-50 MPa; and according to GB/T1037-1988, it is determined that a water vapor transmission rate is 0.2-0.5 g/m<2>.24 h.mm, so the technical problems that a conventional polyethylene plastic pipe is not high in both toughness and watervapor transmission rate are solved.