62 results about "Environmental stress cracking" patented technology

The invention provides a processing device for preventing stress cracking of a fluorinated ethylene propylene cable material, which is characterized in that a raw material mixing tank (1) is communicated with a closed condensation barrel (2) and a reaction chamber (5), a first stirrer (6) and a heating device (7) are arranged in the reaction chamber (5), a discharge port (11) is communicated with a distillation retort (10), the distillation retort (10) is communicated with a solvent tank (14), the distillation retort (10) is communicated with a second stirrer (17), and the second stirrer (17) is communicated with the solvent tank (14). A second stirrer (17) is communicated with a collecting tank (19) after passing through a rinsing bath (18), a perfluoroalkyl vinyl ether modified fluorinated ethylene propylene cable material emulsion is used as a base material, a homogeneous system is formed by utilizing the characteristic that hexafluoroisopropanol can be mixed and dissolved with water and can also be dissolved with organic compounds, heat treatment under pressure is carried out, hexafluoroisopropanol is recovered through distillation, and then the emulsion is condensed. According to the fluorinated ethylene propylene resin cable material prepared by the invention, the problem of internal stress defects is eliminated, and the environmental stress cracking resistance of cable products is improved.

This utility model relates to the field of composite cable technology and discloses a 0.6 / 1kV long-life heat-resistant composite cable, comprising: a main control insulation wire, an outer sheath layer for the main control insulation wire, a supporting skeleton for the outer sheath layer, and multiple pressure-resistant parts for providing support capacity fixedly connected to the outer surface of the supporting skeleton. A secondary wire layer is provided on the adjacent side of any two adjacent pressure-resistant parts, and a filler protective layer is provided on the outer surface of the multiple secondary wire layers. This utility model possesses excellent high and low temperature resistance, mechanical strength, and environmental stress cracking resistance, providing comprehensive protection for the internal structure of the cable. This allows the cable to maintain stable performance under various harsh climatic conditions, further enhancing its long-life characteristics. The two direct protective layers protecting the main control insulation wire and the secondary control insulation wire, with their excellent high-temperature resistance, protect the cable's performance and slow down the aging process.

Provided in this disclosure is an ethylene interpolymer composition. The ethylene interpolymer composition includes a first ethylene interpolymer, a second ethylene interpolymer, and a third ethylene interpolymer. Further, the ethylene interpolymer composition has a density of at least 0.945 g / cm3; an environmental stress crack resistance (ESCR), measured according to ASTM D1693, Condition B, 10% IGEPAL CO-360, of at least 90 hours; and an Izod impact strength of at least 80 J / m, as measured according to ASTM D256.

A solution-phase polymerization process using a metallocene catalyst in the first reactor and a Ziegler-Natta catalyst in the second reactor yielded 0.942 g / cm³. 3 A high-density polyethylene composition is obtained having a density and a melt index I2 exceeding 5.0 g / 10 min. When prepared into plaque, the high-density polyethylene resin has an environmental stress crack resistance (ESCR) exceeding 1000 hours (determined by ASTM D1693 in 100% IGEPAL CO-630 under condition B) and an IZOD impact strength of 10 feed-pounds / inch or more. The polyethylene composition containing the first and second ethylene copolymers is relatively easy to process and can be used in the manufacture of molded articles.

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.

The invention relates to the technical field of polyethylene high polymer materials, and particularly discloses a high-strength polyethylene material for water supply engineering and a preparation method of the high-strength polyethylene material. The high-strength polyethylene material for the water supply engineering comprises the following components in parts by weight: 100 parts of high-density polyethylene, 20-30 parts of a modified ethylene-alpha olefin copolymer, 2-5 parts of an ethylene-glycidyl methacrylate copolymer, 1-2 parts of an antioxidant and 2-3 parts of a lubricant, the modified ethylene-alpha olefin copolymer is prepared by the following steps: carrying out melt blending extrusion on an ethylene-alpha olefin copolymer and a pore-foaming agent, putting a molded blend into deionized water, continuously soaking for 12-16 hours, taking out and drying. Through the synergistic effect of physical modification and chemical compatibility, the prepared polyethylene material has excellent toughness, strength and environmental stress cracking resistance, and is especially suitable for water supply pipes.

The invention relates to the technical field of submarine cables, and provides a large-diameter and large-thickness submarine cable and a cooling and conveying device, and the large-diameter and large-thickness submarine cable comprises a cable core, a cabling wrapping tape layer, a general wrapping inner protection layer, an armor layer and an outer protection layer. The cable core comprises an electric unit and an optical unit, the electric unit is provided with a conductor, the conductor is of a multi-layer structure, and semi-conductive water-blocking glue is arranged between every two adjacent layers of structures; and both the inner sheath and the outer sheath are prepared from medium-density insulating polyethylene through pressurization and extrusion. According to the submarine cable, the medium-density insulating polyethylene is adopted, so that the inner sheath and the outer sheath which are wrapped together keep relatively good structural strength and environmental stress cracking resistance for a long time, and the submarine cable is prevented from entering water or cracking; the inner protection layer and the outer protection layer are wrapped in a pressurized extrusion mode, so that the medium-density insulation polyethylene can fill gaps on the outer side of the cabling belting layer and the outer side of the armored belting layer, and the problem that the submarine cable in the prior art is poor in water resistance and cracking resistance is solved.

This invention discloses a high-weather-resistant ABS composite material and its preparation method, belonging to the field of polymer materials technology. Addressing the problems of existing ABS materials such as easy loss of light stabilizers, poor weather resistance, susceptibility to stress cracking, and low flame retardancy, this invention provides a composite material comprising ABS resin, maleic anhydride-grafted ABS, CeO2@ZIF-8 / HALS micro / nano-release light stabilizer, and amino-terminated oligomeric polycarbonate. A three-dimensional physicochemical barrier network is constructed through micro / nano-channel slow-release technology and end-group reaction in-situ crosslinking technology. This invention significantly improves the material's long-term weather resistance and anti-loss properties, greatly enhances its resistance to environmental stress cracking, and achieves UL-94 V-0 flame retardancy and excellent anti-dripping properties without the need for additional conventional flame retardants. It is suitable for automotive exteriors, 5G base stations, and photovoltaic modules.

The present disclosure relates to a polyethylene composition capable of producing a molded product having excellent environmental stress crack resistance, and improving total volatile organic compound (TVOC) properties that can be generated by a low molecular weight polymer, and a method for preparing the same.

A solution phase polymerization process employing a metallocene catalyst in a first reactor and a Ziegler-Natta catalyst in a second reactor provides a polyethylene composition having a density > = 0.940 g / cm3 and a melt index I2 of less than 3.0 g / 10 min. The polyethylene composition has a good combination of environmental stress cracking resistance, cantilever impact strength and stiffness when made into a plate. The polyethylene composition comprising the first ethylene copolymer and the second ethylene copolymer also has a good processing window when preparing a rotationally molded sample.

The invention relates to the technical field of high polymer materials, in particular to a composite composition for rotational plastic, polyvinyl rotational plastic and application. The composite composition for the rotational molding material comprises a component A and a component B, wherein the component A comprises polyethylene resin, modified polyethylene resin, polyethylene wax and alkylphenol polyoxyethylene ether; the component B comprises a modified fiber material, an antioxidant, a flame retardant, an inorganic filler and a light stabilizer; wherein the modified polyethylene resin is polyethylene resin modified by a polysiloxane compound; the modified fiber material is a fiber material modified by organic acid or inorganic acid. The rotational plastic prepared from the composite composition for the rotational plastic provided by the invention has the mechanical properties of environmental stress cracking resistance and high impact resistance.

The invention relates to the technical field of high polymer material modification, and discloses a modified regenerated PE plastic pipeline and a preparation method thereof, and the pipeline is prepared from regenerated PE, a vinyl alcohol copolymer, an in-situ reinforcing agent composed of boric acid and tetraethoxysilane, a temperature control latent catalyst and other raw materials. The preparation method is characterized by comprising the following steps: in a double-screw extruder with a plurality of temperature zones, firstly carrying out melt blending on regenerated PE and a vinyl alcohol copolymer in a low-temperature zone to complete molecular welding; then, in a high-temperature area, through heating activation of a temperature-controlled latent catalyst, a dynamic boron ester bond network and an in-situ silicon dioxide network are synchronously initiated and constructed; through programmed sequential reaction, the technical problem of mutual interference of multiple reactions in traditional modification is solved, and a microstructure with molecule welding repair and dual-network synergistic enhancement is constructed in a regenerated PE matrix. The prepared pipeline has excellent mechanical properties, environmental stress cracking resistance and long-term hydrostatic strength.

The application relates to the technical field of high polymer material processing, and discloses a one-step granulation method for a polyethylene sheath material of an optical cable, which comprises the following steps: pre-mixing recycled high-pressure / linear low-density polyethylene film material, recycled low-pressure high-density polyethylene sheet material and an enhanced synergistic additive master batch; performing low-temperature pretreatment at 90-110 DEG C, so that low-melting-point components in the master batch are melted, and the two recycled materials with different physical forms are bonded into uniform agglomerates; feeding the agglomerates into an extruder, and performing melt extrusion granulation at 180-220 DEG C, during which interface reactivity compatibilizers in the master batch play a role. The application solves the problems of uneven feeding and poor compatibility caused by the fact that the traditional one-step method is difficult to process recycled materials with great form difference, can stably obtain a sheath material with excellent mechanical properties and environmental stress cracking resistance, and the whole process is continuous, efficient and low in cost.

The application relates to a polyethylene resin for rotational molding and a preparation method and application thereof, and belongs to the technical field of polyethylene resins. The polyethylene resin is a copolymer of ethylene and alpha-olefin; the content of a fraction greater than 120 DEG C obtained by continuously performing self-nucleation annealing thermal fractionation test on the polyethylene resin is 45-55 wt%, the content of a fraction of 116-120 DEG C is 15-20 wt%, the content of a fraction of 111-115 DEG C is 10-15 wt%, the content of a fraction of 100-110 DEG C is 11-15 wt%, and the content of a fraction less than 98.5 DEG C is 8-10 wt%. The polyethylene resin has excellent impact resistance, environmental stress cracking resistance and slow crack growth resistance, and is suitable for military packaging boxes.

The invention discloses a preparation method of an anti-corrosion water-blocking overhead insulated wire, and relates to the technical field of cables. Polyethylene, modified silicon dioxide, organic peroxide and organic tin are mixed and extruded to prepare modified polyethylene; cerium oxide, an ethylene-octylene copolymer and an ethylene-octylene segmented copolymer are used as master batch raw materials; and finally melting, extruding and coating the master batch, the modified polyethylene, the silicone rubber and the additive on the surface of the copper conductor, and curing to obtain the insulated conductor. The modified silicon dioxide participates in polyethylene cross-linking modification to form a compact network structure, so that the release of silver ions is effectively controlled, and the water blocking performance is improved; meanwhile, the ethylene-octylene copolymer and the block copolymer are compounded, so that the aging resistance and the environmental stress cracking resistance of the matrix are synergistically enhanced. The obtained conductor has excellent corrosion resistance, water resistance and aging resistance, and the service life of the overhead conductor is remarkably prolonged.

The utility model discloses a high-strength modified polyethylene anti-corrosion thermal insulation pipe, which relates to the technical field of thermal insulation pipes and comprises a working steel pipe and an outer protective pipe, the outer protective pipe is movably sleeved outside the working steel pipe, the outer wall of the working steel pipe is coated with a polyethylene anti-corrosion layer, and the outer protective pipe is sleeved outside the polyethylene anti-corrosion layer. The outer protection pipe comprises a protection sleeve layer, a high-density polyethylene protection layer and a heat preservation layer. The beneficial effects of the utility model are that: through setting the connection relation of the outer protective pipe, the protective sleeve layer, the high density polyethylene protective layer, the thermal insulation layer, the polyethylene anticorrosive layer and the working steel pipe, dust, grease, dirt and other attachments on the surface of the working steel pipe are removed through the derusting equipment, and then the derusted working steel pipe is coated; the low-temperature modified polyethylene material is creatively used, high-density polyethylene and low-density polyethylene are combined to be processed into the protective layer, and the protective layer has the strength of the high-density polyethylene and the toughness of the low-density polyethylene and has relatively high environmental stress cracking resistance time.

The application discloses a high-strength and high-toughness chemical fertilizer packaging bag and a preparation process thereof, and relates to the technical field of high polymer materials. The packaging bag prepared by the application is a five-layer co-extrusion blow molding film structure, and comprises, from outside to inside, a surface layer, a secondary surface layer, a core layer, a secondary inner layer and an inner layer in sequence, and an interface layer with rigidity and flexibility, a multi-dimensional physical cross-linking network and a dynamic reversible bond self-repairing structure are constructed, so that the problems of easy agglomeration of inorganic fillers, insufficient chemical corrosion resistance and weak interlayer adhesion are effectively improved. The packaging bag has high tensile strength, high puncture toughness and excellent environmental stress cracking resistance, and is suitable for high-strength packaging of various chemical fertilizers.

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 discloses PCR (Polymerase Chain Reaction) enhanced high-density polyethylene and a preparation method thereof. Belongs to the technical field of polymer materials. The polyethylene disclosed by the invention comprises PCR-HDPE (Polymerase Chain Reaction-High-Density Polyethylene), linear low-density polyethylene, a hydrogenated styrene-isoprene-styrene block copolymer, a maleic anhydride grafted compatilizer, a polyfunctional epoxy chain extender, nano calcium carbonate, an antioxidant and a lubricant. The material is prepared by a specific preparation method. According to the PCR enhanced high-density polyethylene disclosed by the invention, through the synergistic effect of'rigidity-toughness synergistic toughening ', 'multiphase interface synergistic coupling' and'two-stage devolatilization purification ', the impact toughness, environmental stress cracking resistance and processing stability of the material are unexpectedly and greatly improved on the premise of ensuring high PCR content; the technical problem that in a traditional PCR-HDPE reinforcement technology, the mechanical property and the processability are difficult to consider at the same time is solved.

The present invention relates to a thermoplastic polyurethane (TPU) composition having adequate biostability and excellent environmental stress cracking resistance. The TPU composition comprises the reaction product of: a) a polyisocyanate comprising at least 50 wt% of (i) an aliphatic diisocyanate having 6 to 10 carbon atoms, based on the total weight of the polyisocyanate component; b) a polyol comprising at least a hydroxyl-terminated poly(butadiene); and c) a chain extender comprising at least one diol chain extender; wherein the thermoplastic polyurethane composition has 22 wt% to 65 wt% hard segments, based on the total weight of the composition. The TPU composition is suitable for use in the manufacture of medical devices.

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.

This invention discloses a multilayer composite pipe and its preparation method, belonging to the field of polymer materials technology. The multilayer composite pipe includes an inner layer, a middle layer, and an outer layer arranged sequentially from the inside out. The inner layer is random copolymer polypropylene, the middle layer is 2-amino-2-methyl-1,3-propanediol, and the outer layer is modified polyvinyl chloride. The thickness ratio of the inner, middle, and outer layers is 1:(0.6-1.3):(0.6-0.8). This multilayer composite pipe utilizes the phase change of 2-amino-2-methyl-1,3-propanediol for energy storage, providing the function of storing energy at high temperatures and releasing energy at low temperatures, thus achieving heat preservation and energy saving. The use of modified polyvinyl chloride in the outer layer increases the pipe's weather resistance and resistance to environmental stress cracking, while also further improving the pipe's thermal insulation performance.

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.

The invention discloses a modified PVC valve suitable for a strong acid environment and a preparation method of the modified PVC valve. The preparation method comprises the following steps: firstly, carrying out free radical copolymerization on butyl methacrylate, glycidyl methacrylate, 2, 2, 2-trifluoroethyl methacrylate and gamma-methacryloxypropyltrimethoxysilane to synthesize a polymeric auxiliary agent; then melting and mixing the auxiliary agent with chlorinated polyvinyl chloride resin, montmorillonite filler, a stabilizer, a flexibilizer and a processing auxiliary agent to prepare functional master batch; and finally, blending the master batch and resin, and carrying out injection molding. Through the synergistic effect of hydrophobicity of the fluorine-containing monomer and interface bonding of the silane coupling agent, a stable in-situ protection layer is constructed in the material, and the acid permeability resistance, the environmental stress cracking resistance and the long-term dynamic sealing performance of the valve are remarkably improved. The obtained valve has excellent corrosion-resistant durability and structural integrity in a strong acid environment, and is suitable for harsh working conditions such as chemical engineering and electroplating.

The present disclosure relates to a polyethylene composition including a virgin polyethylene and a post-consumer waste polyethylene (PCW PE), and having improved environmental stress cracking resistance together with excellent mechanical properties.

The present application relates to a kind of multilayer polymer film and its manufacturing method, and the use and method of the multilayer polymer film for manufacturing shaped body and the shaped body obtained by manufacturing.The multilayer polymer film includes hard core layer and soft skin layer, wherein the hard core layer includes one or more polymer layers, the material of each polymer layer of the hard core layer includes at least one transparent polyamide, the glass transition temperature Tg of each transparent polyamide is between 100 DEG C-200 DEG C;Each soft skin layer includes one or more polymer layers, and each polymer layer of each soft skin layer includes at least one thermoplastic polyurethane or polyamide elastomer with Shore hardness of 50D-85D.The multilayer polymer film provided by the present application has excellent transparency, environmental stress cracking resistance, and can keep high stress under warm and moist conditions, and is particularly suitable for making dental film.

The utility model provides a novel welding formula polyethylene cable y type seamless crosslinking structure, including connecting sleeve, through shielding layer, even conductor surface electric field, avoid partial discharge, through insulating layer, high temperature (90°C~130°C) resistance, high dielectric strength, environmental stress cracking resistance, through insulating shielding layer, with insulating layer close adhesion, even electric field distribution, reduce the risk of partial discharge at insulating interface, through metal shielding layer, short -circuit current conduction passage, electromagnetic shield, reduce the outside interference, mechanical protection, through outer sheath, waterproof, prevent chemical corrosion, prevent ultraviolet, mechanical protection, resist wear and tear in the laying or operation, through filling layer, fill multicore cable gap, keep structure round, prevent longitudinal water seepage, add peroxide crosslinking agent when extruding polyethylene insulating layer, make polyethylene molecular chain crosslinking into three -dimensional net structure through high temperature (such as three layer co -extrusion process), insulating layer is continuously formed in the production line, no subsection joint.

The application discloses a kind of flame-retardant ant-proof outdoor optical cable and preparation method thereof, belong to optical fiber cable manufacturing technical field.The application solves the problems of existing optical cable ant-proof agent easy migration, mechanical property deterioration caused by high filling of flame retardant, poor environmental stress cracking resistance and poor hot and humid aging resistance, and irreversible mechanical damage.The technical scheme: outer sheath is composed of specific weight parts of LLDPE, EVA, PE-g-MAH, modified multi-effect synergistic ant-proof flame-retardant hybrid composite (chitosan / capsaicin / tannic acid supramolecular coating), modified ammonium polyphosphate (surface grafting phenylboronic acid), antioxidant and lubricant;During melt mixing, catechol groups and phenylboronic acid groups are in situ dehydrated and condensed to construct dynamic borate ester covalent crosslinking network.The optical cable has the advantages of long-term ant-proof, halogen-free flame-retardant V-0 level, no dripping, ultra-high environmental stress cracking resistance (>1500h), performance retention rate >95% after hot and humid aging, and macroscopic self-repair efficiency >92%.

Ethylene-based polymers having a melt index of 0.15 to 0.5 g / 10 min, a high load melt index of 15 to 50 g / 10 min, a density of 0.94 to 0.96 g / cm3, and higher and lower molecular weight components are disclosed. The higher molecular weight component has an HMW HL275 of from 3 to 8 g / 10 min and an HMW density of from 0.92 to 0.94 g / cm3. These polymers can have one or more of the following: an environmental stress crack resistance (ESCR) of at least 1,000 hours, a yield strength of 3,000 to 5,000 psi, a viscosity at 100 sec-1 of 1,000 to 1,800 Pa-sec, and / or a notched constant toughness stress (NCLS) of 80 to 1,000 hours.

An anti-environmental stress cracking additive particle, wherein the particle may include an anti-environmental stress cracking active phase, a support phase, and a compatibilizing phase, and wherein the particles have an average size of up to 200 μm. Processes for preparing the anti-environmental stress cracking additive may include a solvent / non-solvent process, a free non-solvent process, and solid state methods. A polymer composition may include a matrix polymer and the anti-environmental stress cracking additive. An article may comprise the polymer composition comprising the anti-environmental stress cracking additive particle.