170 results about "ETFE" patented technology

The invention relates to the technical field of ETFE film testing, and discloses an ETFE film structure life prediction method and system based on machine learning, and the method comprises the steps: carrying out the standardization preprocessing of the cyclic load fatigue data of an ETFE film structure in a biaxial stress state, and obtaining a standard feature vector; performing membrane structure geometric weight distribution on the standard feature vector to obtain a weighted feature vector; performing multi-time scale damage feature extraction based on the weighted feature vector to obtain a fused damage feature; inputting the fused damage features into a fatigue damage evolution physical constraint embedder for constraint calculation to obtain physical constraint damage features; bayesian probability life prediction is carried out on the physical constraint damage features, and a fatigue life prediction value of the ETFE film structure is obtained.According to the method, key damage parameters of different deformation stages can be recognized in a self-adaptive mode, the characterization precision of the fatigue behavior of the film structure is remarkably improved, and the life prediction accuracy of the ETFE film structure is improved.

The invention relates to the technical field of metal wires, in particular to a low-voltage aluminum wire and a preparation method thereof, the sectional area of the wire is 35 square millimeters, the wire comprises an aluminum alloy conductor and an insulating layer, the aluminum alloy conductor comprises the following chemical components: 0.7-0.9% of magnesium, 0.4-0.6% of silicon, 0.15-0.25% of copper, 0.08-0.12% of zirconium, 0.05-0.09% of scandium, 0.03-0.07% of silver, 0.01-0.03% of erbium, 0.02-0.04% of vanadium and the balance of aluminum, and the microstructure of the aluminum alloy conductor is in gradient distribution. The center is ultra-fine grains, a transition region contains a nano precipitated phase, the surface layer is of a high-density dislocation and nano precipitated phase synergistic reinforcement structure, the insulating layer is of a double-layer composite structure, the inner layer is a crosslinked polyethylene modified layer, the outer layer is an ethylene-tetrafluoroethylene copolymer modified layer, the electric conductivity is improved to 58% IACS or above, and the tensile strength is improved to 280 MPa or above.

The invention relates to the technical field of cables, and provides a flexible corrosion-resistant robot cable, which sequentially comprises a cable core, a shielding layer, an inner sheath layer and an outer sheath layer from inside to outside, and is characterized in that the cable core sequentially comprises a conductor and an insulating layer from inside to outside; the outer sheath layer comprises the following raw material components in parts by weight: 60-70 parts of high-density polyethylene, 15-25 parts of an ethylene-tetrafluoroethylene copolymer, 0.5-1.5 parts of an antioxidant, 1-3 parts of a plasticizer, 8-12 parts of a flame retardant, 10-20 parts of polyethylene glycol diacrylate composite barium sulfate and 1-2 parts of a lubricant; the polyethylene glycol diacrylate composite barium sulfate is prepared from the following raw materials: polyethylene glycol diacrylate, barium chloride and sodium sulfate. According to the technical scheme, the problem of poor corrosion resistance of the robot cable in the prior art is solved.

The invention belongs to the technical field of ETFE film preparation, and particularly relates to a preparation method of a high-strength ETFE film. The preparation method of the ETFE film comprises the following steps: preparing a mixture of modified nano cellulose and calcium magnesium silicate whiskers; carrying out modification treatment on the poly (p-benzamide) fiber; and preparing the ETFE film. According to the preparation method of the high-strength ETFE film, the perfluoroalkoxy copolymer and the ETFE resin are selected and mixed for use, during melt extrusion, the perfluoroalkoxy copolymer can lubricate the ETFE and reduce the overall melt viscosity, the critical shear rate of the perfluoroalkoxy copolymer is higher than that of the ETFE, melt fracture can be inhibited, the film is evenly extruded, the flatness of the film surface is improved, and the high-strength ETFE film is prepared. And meanwhile, the elastic retraction of the ETFE is inhibited during high-temperature setting. And the modified nano cellulose and calcium magnesium silicate whisker mixture and the modified poly-p-benzamide fiber are added to enhance the mechanical strength of the prepared ETFE film.

The application discloses a cross-linked ETFE composite film with gradient ultraviolet shielding function and a preparation method and application thereof, and belongs to the technical field of ETFE film preparation. The cross-linked ETFE composite film is composed of three layers of a surface layer, a middle layer and a bottom layer. The surface layer material comprises ETFE resin and fluorinated carbon quantum dots; the middle layer material comprises ETFE resin, allyl-containing comonomer A and phenyl-containing comonomer B; and the bottom layer material comprises ETFE resin and CeO2 nanowires. The fluorinated carbon quantum dots have a particle size of 3-5 nm and contain a -C4F9 structure. The comonomer A is an allyl-containing fluorine olefin monomer, and the comonomer B is a phenyl-containing organic fluorinated compound. Through the synergistic effect of the surface layer self-migration fluorinated carbon quantum dots, the middle layer copolymerization modification and the bottom layer CeO2 nanowires, high light transmittance, full-waveband ultraviolet shielding and long-term weather resistance are achieved.

The invention relates to the field of cables, and discloses a fire-resistant light cable for a safety harbor-returning system for a ship and a processing method thereof.The cable comprises a guide core, a fire-resistant layer, an insulating layer, a cabling layer, an inner sheath layer, an armor layer and an outer sheath layer which are sequentially arranged from inside to outside, and the inner sheath layer and the outer sheath layer are prepared by extruding sheath layer materials; the sheath layer is made of low-density polyethylene, nitrile rubber, ethylene-tetrafluoroethylene copolymer, functional additives, composite filler and auxiliaries; the functional additive is prepared by the following steps: reacting 3, 5-di-tert-butyl-4-hydroxybenzoyl chloride with 2-chloro-4, 6-diamino-1, 3, 5-triazine to obtain a modified hindered phenol component, and then reacting 1, 4-p-xylylene dichloride with 10-(2, 5-dihydroxyphenyl)-10H-9-oxa-10-phosphaphenanthrene-10-oxide to obtain a product, and continuously reacting the product with the modified hindered phenol component; the composite filler is prepared by modifying vermiculite with titanium dioxide and zinc oxide pillared. The cable prepared by the invention has excellent mechanical properties, flame retardance and aging resistance.

The invention relates to the technical field of electric wires and cables, and discloses a fluoroplastic insulating high-temperature-resistant fireproof cable and a preparation method thereof.The cable comprises a conductor layer, the conductor layer is formed by twisting multiple strands of copper wires, the periphery of the conductor layer is coated with a fluoroplastic insulating layer, the periphery of the fluoroplastic insulating layer is coated with a shielding layer, and the shielding layer is arranged on the periphery of the conductor layer. The shielding layer is of a copper strip braided structure, the periphery of the shielding layer is coated with an armor layer, the armor layer is braided by stainless steel wires, the periphery of the armor layer is coated with a sheath layer, and the sheath layer comprises the following components in parts by mass: 50-70 parts of functionalized ethylene-tetrafluoroethylene copolymer. According to the invention, an interpenetrating polymer network formed by in-situ crosslinking of the functionalized fluoropolymer and the organosilicon elastomer is constructed in the sheath layer, and an energy field gradient response vulcanization process is adopted, so that the prepared cable sheath maintains the inherent high temperature resistance of fluoroplastic, and the flexibility and mechanical strength of the material are improved at the same time.

The invention relates to a photoelectric composite cable suitable for an unmanned aerial vehicle platform, which comprises a wrapping layer formed by wrapping a covering film, an accommodating space is formed in the wrapping layer, a two-core electric unit and a one-core single-mode optical fiber are respectively placed in the accommodating space, and a plurality of aramid fibers are distributed in the accommodating space and are filled to form a cable; an insulating layer is distributed on the electric unit, an outer wrapping layer is distributed on the single-mode optical fiber, and the insulating layer, the outer wrapping layer and the covering film are all made of high-temperature-resistant fluoroplastic formed by ethylene-tetrafluoroethylene copolymer; the thickness of the covering film is 0.05 mm, and the total thickness after wrapping is 0.10 mm + / -0.02 mm; the outer diameter of the photoelectric composite cable is 2.2 mm + / -0.1 mm, and the total weight per meter is smaller than or equal to 12 g. Therefore, the whole photoelectric composite cable has better high temperature resistance, can meet high tensile strength under the condition of light weight, can realize low-loss signal transmission, and has better heat dissipation effect.

The invention discloses a cross-linked ETFE composite film with a gradient ultraviolet shielding function and a preparation method and application thereof, and belongs to the technical field of ETFE film preparation, the cross-linked ETFE composite film is composed of a surface layer, a middle layer and a bottom layer; the surface layer material comprises ETFE resin and carbon fluoride quantum dots; the material of the middle layer comprises ETFE resin, an allyl-containing comonomer A and a phenyl-containing comonomer B; the bottom layer material comprises ETFE resin and a CeO2 nanowire; the particle size of the carbon fluoride quantum dot is 3-5nm, and the carbon fluoride quantum dot comprises a-C4F9 structure; the comonomer A is a fluoroolefin monomer containing allyl; the comonomer B is organic fluoride containing phenyl. Through the synergistic effect of the self-migration carbon fluoride quantum dots on the surface layer, copolymerization modification on the middle layer and the CeO2 nanowires on the bottom layer, high light transmittance, full-band ultraviolet shielding and long-term weather resistance are achieved.

The invention belongs to an insulating material, relates to a polypropylene-based insulating material, and in particular relates to a high-temperature-resistant intrinsic self-recovery polypropylene insulating material as well as a preparation method and application thereof. The material is formed by blending a polypropylene grafting material and an ethylene-tetrafluoroethylene copolymer grafting material according to a mass ratio of 6.0: 4.0-9.5: 0.5, wherein the PP graft material comprises a PP graft polymer and an antioxidant, and the PP graft polymer is a graft polymer formed by grafting 4-propenyloxy-2-hydroxybenzophenone to polypropylene; the ETFE graft material comprises an ETFE graft polymer and an antioxidant, and the ETFE graft polymer is a graft polymer of glycerol grafted ethylene-tetrafluoroethylene copolymer. On the basis of keeping the original excellent performance of polypropylene, the polypropylene has higher heat resistance and self-recovery capability through a grafting modification technical means.

The invention discloses a release film for semiconductor packaging based on PET and ETFE compounding and a preparation method of the release film, and belongs to the technical field of film materials, the release film structurally comprises a PET base material layer, an adhesive layer and an ETFE layer which are sequentially arranged, and the adhesive layer is prepared from the following raw materials in parts by mass: 40-60 parts of fluorine-containing acrylate compound; 20 to 30 parts of epoxy modified organic silicon resin; 5 to 10 parts of nano silicon dioxide; 1 to 2 parts of a photoinitiator; wherein the surface of the contact side of the PET base material layer and the adhesive layer is subjected to plasma treatment or corona treatment, and the dyne value is larger than or equal to 50 mN / m; the surface of the side, making contact with the adhesive layer, of the ETFE layer is subjected to fluoridation treatment, and the surface roughness Ra is smaller than or equal to 1 micrometer. The release film has the advantages of controllable release force in a range of 0.1-5N / 25mm, good stability, temperature resistance of 175 DEG C, good organic solvent resistance, and wide application prospect in the field of semiconductor packaging.

The invention relates to the technical field of coating preparation, and provides a super-hydrophobic oleophobic epoxy anticorrosive wear-resistant powder coating and a preparation method thereof. According to the coating, phenolic epoxy resin and bisphenol A epoxy resin are used as matrix resin, phenolic hydroxyl resin is used as a curing agent, super-hydrophobic / oleophobic carbon nanotubes are used as a modifier, ethylene-tetrafluoroethylene copolymer and polyamide resin are used as flexibilizers, super-hydrophobic / oleophobic nano silicon dioxide powder and super-hydrophobic hollow glass beads are used as fillers, and the super-hydrophobic / oleophobic nano silicon dioxide powder and the super-hydrophobic hollow glass beads are used as fillers. The super-hydrophobic and oleophobic epoxy anti-corrosion wear-resistant powder coating is prepared by taking an inorganic pigment as a coloring agent through the steps of material preparation, premixing, melt extrusion, tabletting, cooling, crushing and sieving under the cooperation of various functional assistants. The powder coating is subjected to electrostatic spraying (40-70 KV), the coating film thickness is about 350 microns, and the powder coating is cured into a film after being subjected to hydrophobic / oleophobic min at 180 DEG C / 5 min or 230 DEG C / 1.5 under the baking condition of 180 DEG C / 5 min. The contact angles of oil drops and water drops can reach 160 degrees and 161 degrees respectively, and the rolling angles are 2 degrees and 1 degree respectively.

To provide a resin molded article having superior durability in low-friction properties in a surface treatment layer containing fluorine atoms.SOLUTION: A resin molded article according to one embodiment of the present disclosure includes a base body composed of a crosslinked body of a resin composition. At least a part of a surface of the base body is a surface treatment layer. A main component in the resin composition is an ethylene-tetrafluoroethylene copolymer, polyvinylidene fluoride, polyethylene, or polypropylene. The ratio of the number of fluorine atoms to the number of carbon atoms in the surface treatment layer is greater than the ratio of the number of fluorine atoms to the number of carbon atoms in a region of the base body that excludes the surface treatment layer. The average thickness of the surface treatment layer is 500 nm or more and 2000 nm or less.SELECTED DRAWING: Figure 1

The invention relates to the technical field of cables, and provides a corrosion-resistant aerial insulated cable and a manufacturing method thereof. A corrosion-resistant overhead insulated cable sequentially comprises a conductor, a shielding layer and an insulating layer from inside to outside, and the insulating layer is prepared from the following raw materials in parts by weight: 65-75 parts of high-density polyethylene, 5-7 parts of modified kaolin, 13-17 parts of ethylene-tetrafluoroethylene copolymer, 0.5-2 parts of antioxidant, 1-3 parts of plasticizer, 8-10 parts of flame retardant and 0.5-1.5 parts of lubricant; wherein the modified kaolin is prepared by the following steps: firstly, modifying kaolin by vinyltriethoxysilane for the first time to obtain silanized kaolin, and then modifying the silanized kaolin by lauryl amine dipropylidene diamine and gamma-glycidyl ether oxyethyl trimethoxysilane for the second time. According to the technical scheme, the problem of poor corrosion resistance of the overhead insulated cable in the prior art is solved.

This application relates to the field of insulating materials, specifically disclosing a flexural insulating material, its preparation method, and a robot cable, comprising the following raw materials in parts by weight: 50-80 parts of low-density polyethylene, 30-40 parts of medium-density polyethylene, 30-40 parts of ethylene-tetrafluoroethylene-perfluoropropyl vinyl ether terpolymer, 1-20 parts of filler, 3-8 parts of compatibilizer, 0.1-5 parts of crosslinking agent, and 0.1-5 parts of co-crosslinking agent. This invention addresses the performance shortcomings of existing insulating materials, achieving a balance of flexural resistance, abrasion resistance, insulation stability, and excellent flexibility, thus meeting the stringent requirements of high-frequency cables used in robots / manipulators.

The invention discloses an antistatic teflon sleeve and a preparation method thereof. The antistatic teflon sleeve is prepared from the following components in parts by weight: 80-95 parts of teflon resin, 5-20 parts of a core-shell structure conductive filler, 1-3 parts of a compatilizer, 0.5-2 parts of a flexibilizer and 0.1-0.5 part of an antioxidant. The outer protective layer is prepared from the following components in parts by weight: 70 to 85 parts of ethylene-tetrafluoroethylene copolymer, 5 to 15 parts of modified nano silicon dioxide, 5 to 10 parts of fluororubber, 1 to 3 parts of antistatic aid and 0.1 to 0.5 part of ultraviolet absorbent. Through the design of the core-shell structure conductive filler, the core layer nano copper powder provides high conductivity, the shell layer PVDF has good compatibility with the Teflon base material, the surface modification layer further enhances the interface bonding force, the volume resistivity of the inner layer base material is reduced, and the antistatic requirement is met; the conductive filler is uniformly dispersed in the base material instead of a surface coating, so that the antistatic performance failure caused by friction or bending is avoided, and the antistatic performance is lasting and stable.

The application relates to the technical field of electric wire and cable, and discloses a fluoroplastic insulation high-temperature-resistant fireproof cable and a preparation method, the cable comprises a conductor layer, the conductor layer is twisted by multiple copper wires, the conductor layer is coated with a fluoroplastic insulation layer, the fluoroplastic insulation layer is coated with a shielding layer, the shielding layer is a copper-belt woven structure, the shielding layer is coated with an armor layer, the armor layer is woven by stainless steel wires, the armor layer is coated with a sheath layer, and the sheath layer comprises the following components in mass fractions: functionalized ethylene-tetrafluoroethylene copolymer, 50-70 parts by mass. The application constructs an interpenetrating polymer network formed by in-situ crosslinking of a functionalized fluoropolymer and an organic silicon elastomer in the sheath layer, and adopts an energy field gradient response vulcanization process, so that the prepared cable sheath keeps the inherent high-temperature resistance of fluoroplastic, and the flexibility and mechanical strength of the material are improved.

The application discloses a kind of super-high flexible robot cables, belong to robot cable technical field.Symmetrical layered structure is used, from inside to outside in turn: cable core, insulating layer, shielding layer and sheath layer.Cable core uses layered structure of stranding, significantly improve the fatigue resistance of cable, prolongs service life;Insulating layer uses ethylene-tetrafluoroethylene copolymer, with good flexibility, and can adapt to complex working environment;Shielding layer uses aluminum foil-tin coated copper wire, provides good electromagnetic shielding effect, reduces signal interference, improves the operation accuracy and reliability of robot system;Sheath layer uses thermoplastic polyurethane elastomer as matrix, and introduces the modifier of independent research and development, substantially improves the flame retardance and flexibility of cable;Therefore, the cable prepared by the application has high flexibility and flame retardance, and can be widely used in industrial robots, medical manipulators, service robots and other high-demand scenarios.

The invention relates to the technical field of medical devices, and specifically discloses a high-adhesion and high-moisturizing lubricating coating, a preparation method thereof, and a coating adhesion testing method. The coating comprises a bottom coating and a surface coating, wherein the bottom coating is a base layer, and is highly adhered to a substrate through chemical bonds or intermolecular forces, and the surface coating is a functional layer, and has a hydrophilic lubricating effect, and has high lubricity, strong moisture retention, and strong wear resistance; the bottom coating comprises a photocurable resin, an active diluent, a photoinitiator, a perfluorosilane coupling agent, an auxiliary agent, and a solvent, and the surface coating comprises a photocurable resin, an active diluent, a photoinitiator, a lubricant, a moisturizing agent, a perfluorosilane coupling agent, and a solvent; the high-adhesion and high-moisturizing lubricating coating prepared by the invention has good biological safety, and is suitable for the application of a perfluoroethylene-propylene copolymer tube body and an ethylene-tetrafluoroethylene copolymer tube body.

The invention provides a preparation method of a high-tensile double-sided mirror surface ETFE film, and relates to the technical field of high polymer materials, and the preparation method specifically comprises the following steps: preparing an ETFE resin material by taking ethylene, tetrafluoroethylene and hexafluoropropylene as monomers through polymerization; extruding the ETFE resin material to obtain a melt material; the melt material is firstly subjected to longitudinal stretching, then subjected to transverse stretching and finally subjected to heat setting, partition temperature control is adopted during longitudinal stretching and transverse stretching, and a stretched film is obtained; and heating the stretched film to 120-140 DEG C at the rate of 2-5 DEG C / min, and annealing to obtain the high-stretching ETFE film. According to the ETFE film and the preparation method thereof disclosed by the invention, by effectively selecting the types of the monomers during preparation of the ETFE, optimizing the ratio of the monomers and optimizing the processing technology, the obtained ETFE film has excellent tensile property while keeping high light transmittance and chemical resistance.

The utility model discloses a flexible photovoltaic assembly suitable for a marine environment. The battery comprises a battery layer, an upper CPC material layer is bonded to the upper portion of the battery layer through a second packaging adhesive film layer, a polypropylene resin glass fiber composite material layer is bonded to the lower portion of the battery layer through a third packaging adhesive film layer, an ethylene-tetrafluoroethylene copolymer material layer is bonded to the upper portion of the upper CPC material layer through a first packaging adhesive film layer, and a polypropylene resin glass fiber composite material layer is bonded to the lower portion of the battery layer through a second packaging adhesive film layer. A lower CPC material layer is adhered to the lower portion of the polypropylene resin glass fiber composite material layer through a fourth packaging adhesive film layer, the upper portion of the ethylene-tetrafluoroethylene copolymer material layer is coated with an upper organic silicon anti-corrosion elastic coating, and the lower portion of the lower CPC material layer is coated with a lower organic silicon anti-corrosion elastic coating. The advantages are that a multi-layer packaging design (four layers of packaging materials and four layers of packaging adhesive films) forms a high-strength composite structure, and the overall impact resistance, corrosion resistance and sealing performance of the assembly are further improved, so that the assembly is more suitable for a complex marine environment.

The application discloses a kind of space stable organic radiation refrigeration coatings and preparation method and application thereof, including optical layer and protective layer coated on the optical layer;The optical layer includes the following components by mass fraction:25~35% first polymer matrix, 35~45% first organic scattering particles, 20~40% first organic solvent;The protective layer includes the following components by mass fraction:60~75% second polymer matrix, 5~10% second organic scattering particles, 15~35% second organic solvent;Wherein, the first organic scattering particles and second organic scattering particles are independently selected from one or several of polytetrafluoroethylene, perfluoroolefin ether alkane, ethylene-tetrafluoroethylene copolymer respectively.In the meantime that space stability is guaranteed, coating weight is significantly reduced, and a new idea of considering performance and cost is provided for spacecraft thermal control.

The utility model discloses a double-sided frosted ETFE film for packaging a semiconductor memory chip, which comprises a film main body, a cementing layer fixedly connected to the upper surface of the film main body, a transition layer fixedly connected to the upper surface of the cementing layer, a transverse tensile layer fixedly connected to the upper surface of the transition layer, and a transverse tensile layer fixedly connected to the lower surface of the transverse tensile layer. The upper surface of the transverse tensile layer is fixedly connected with a longitudinal tensile layer, the upper surface of the longitudinal tensile layer is fixedly connected with a fixed layer, the upper surface of the fixed layer is fixedly connected with an elastic column, and the upper end of the elastic column is fixedly connected with an elastic layer. The situation that the ETFE film body is damaged in the pulling process is avoided; the film main body is connected with other functional layers through the cementing layer, and the functional layers above the transition layer can be torn down, so that the antistatic layer and the anti-friction layer can be replaced when damaged, and the whole film does not need to be replaced.

The invention relates to the technical field of cables, and discloses a light weather-proof insulated cable for an unmanned aerial vehicle. The insulated cable sequentially consists of a conductor, a carbon-based coating insulating layer and a modified aramid sheath layer, the carbon-based coating insulating layer is composed of an inner skin layer ETFE ethylene-tetrafluoroethylene copolymer, a middle layer foaming ETFE ethylene-tetrafluoroethylene copolymer and an outer skin layer carbon-based coating. And weaving and wrapping the modified aramid fiber on the surface of the carbon-based coating insulating layer of the conductor through a high-speed weaving machine to form a modified aramid sheath layer. Organic silicon aromatic polyamide contains a large number of aromatic polyamide structural units, the compatibility with aramid fibers is remarkably improved, the organic silicon aromatic polyamide can be uniformly dispersed in the aramid fibers, and the organic silicon aromatic polyamide contains a flexible siloxane structural monomer and a rigid aromatic polyamide structural unit, so that the fibers have excellent elongation at break and flexibility while keeping high breaking strength, and the mechanical property of the fibers is improved. And as a sheath layer of the cable, the cable is convenient to wind.

The invention discloses application of a novel material in the field of archives and packaging, and relates to the technical field of nano materials. The invention discloses application of a novel material based on hydroxyapatite super-long nanowires in the fields of file boxes, packaging boxes, voucher covers, data covers and voucher paper. The novel material is prepared from the hydroxyapatite super-long nanowires, polycarbonate, fluorinated ethylene propylene and ethylene-tetrafluoroethylene copolymer as raw materials. The hydroxyapatite super-long nanowires are applied to file boxes, packaging boxes, voucher covers, data covers and voucher paper, so that the file boxes, the packaging boxes, the voucher covers, the data covers and the voucher paper have good fire resistance, electrostatic spinning is performed through the ethylene-tetrafluoroethylene copolymer, meanwhile, polycarbonate and fluorinated ethylene propylene are added, the mechanical property of the material is enhanced, the material is more wear-resistant, impact-resistant and tear-resistant, and the service life of the material is prolonged. And loss caused by transportation or use links is effectively reduced, the service life is prolonged, and environmental protection is facilitated.

This invention relates to the field of polymer synthesis technology. This invention provides a controlled polymerization method for a high-alternation-degree ETFE copolymer, comprising the following steps: (1) adding a solvent to a high-pressure reactor, replacing the air, and then filling it with an initial monomer mixture to a total pressure of 1.5-2.5 MPa, wherein the monomer mixture is a mixture of tetrafluoroethylene and ethylene; (2) heating to 60-85°C, adding an initiator to initiate the polymerization reaction; (3) simultaneously adding the monomer mixture continuously or semi-continuously during the polymerization reaction; (4) adding a chain transfer agent, and discharging the product after the reaction, i.e., the high-alternation-degree ETFE copolymer. This invention also provides a controlled polymerization method for a high-alternation-degree ETFE copolymer. This invention also provides an application of the high-alternation-degree ETFE copolymer in new energy, aerospace, high-end equipment manufacturing, and photovoltaic fields. The high-alternation-degree ETFE copolymer of this invention has high alternation degree (>92%), high thermal stability, and excellent mechanical properties.

The invention relates to the technical field of building materials, and particularly discloses anti-crack bare concrete. The anti-cracking bare concrete is prepared from the following raw materials in parts by weight: 320 to 340 parts of cement, 48 to 52 parts of stone powder, 9 to 11 parts of silicon powder, 43 to 47 parts of an anti-cracking agent, 720 to 740 parts of natural sand, 730 to 750 parts of granite macadam with the particle size of 10 to 20 mm, 290 to 310 parts of granite macadam with the particle size of 5 to 10 mm, 150 to 160 parts of water and 9 to 11 parts of a polycarboxylate superplasticizer. Wherein the anti-cracking agent is prepared from the following raw materials: carbon nanofibers, phase change microcapsules, an ethylene-tetrafluoroethylene copolymer, hyperbranched polyester, a silane coupling agent and a nano silicon dioxide dispersion liquid. The anti-crack fair-faced concrete can be used for engineering scenes with requirements for apparent quality and durability, and has the advantages of long-acting crack resistance, high anti-permeability grade and excellent volume stability.

The present disclosure relates to an optical fiber cable (400, 500) comprising one or more optical fibers (202), a coating (104) disposed on an outermost surface (108) of the one or more optical fibers (202), and a sheath (406) surrounding the one or more optical fibers (102). In particular, the coating (104) has a thickness less than 10 micrometres (μm). Further, the coating (104) is made up of a fluoropolymer based hydrophobic resin material such as, perfluoroalkoxy (PFA), fluorinated ethylene propylene (FEP), ethylene tetrafluoroethylene (ETFE), and terapolymer (EFEP).

The invention relates to the technical field of cable protection layers, in particular to a corrosion-resistant underground cable protection layer and a preparation method thereof. The corrosion-resistant underground cable protection layer comprises 75-82 parts of high-density polyethylene, 10-15 parts of an ethylene-tetrafluoroethylene copolymer, 4-6 parts of a compatibilizer, 10-15 parts of glass fibers, 1-3 parts of calcium stearate, 5-10 parts of a dopamine modified filler, 5-10 parts of aminated boron nitride, 1-4 parts of a waterproof agent, 6-10 parts of a flame retardant and 2.5-3 parts of an antioxidant. The dopamine modified filler comprises dopamine modified polyaspartic acid and dopamine modified zinc oxide. According to the invention, the high-density polyethylene and the ethylene-tetrafluoroethylene copolymer are taken as a matrix and are matched with the dopamine modified filler, so that the underground cable protection layer is endowed with excellent acid and alkali corrosion resistance. And by adding aminated boron nitride and glass fiber, the mechanical strength is further improved, and the service life of the cable protection layer is remarkably prolonged.

The invention relates to the technical field of film compounding, and discloses an OCA optical cement-based ETFE film and water oxygen barrier film compounding process, which comprises the following steps: S1, ETFE film pretreatment; s2, pretreating a water-oxygen barrier film; s3, preparation of OCA optical cement; s4, coating is conducted; s5, compounding; s6, staged curing is conducted; and S7, carrying out online detection. According to the ETFE film and water-oxygen barrier film compounding process based on the OCA optical cement, the composite surface of the ETFE film is treated through argon-oxygen mixed gas plasma, the chemical inertness of the surface of the ETFE film is broken, and the affinity of the ETFE film and the OCA optical cement is improved; meanwhile, the composite surface of the AlO-SiO composite barrier film is coated with the KH560 layer, the KH560 layer can serve as a connecting bridge between the AlO-SiO composite barrier film made of an inorganic material and the OCA optical cement made of an organic material, the interfacial compatibility of the AlO-SiO composite barrier film made of the inorganic material and the OCA optical cement made of the organic material is improved, and therefore the peel strength between film layers after compounding is improved, the decrease amplitude of the peel strength after ultraviolet aging can be reduced, and the service life of the AlO-SiO composite barrier film is prolonged. The long-term use reliability of the composite membrane is ensured.