3034 results about "Polyvinyl chloride" patented technology

The invention relates to the technical field of regeneration of waste polyester, in particular to a polyester micro-plastic recycling and impurity removing method and equipment. According to the method, the irradiation technology is adopted for treating the polyester micro-plastic, the polyvinyl chloride is removed by combining electron beam irradiation with the specific gravity method, the radiation dosage and time are accurately controlled, the polyvinyl chloride in the polyester micro-plastic can be effectively removed, the color of the polyester micro-plastic is not affected, and the treated polyester micro-plastic can meet the spinning requirement. The equipment is used for realizing the impurity removal method and comprises irradiation treatment equipment, a separation tank, a cleaning tank, a dehydrator and a drying tower. The equipment is simple in structure and convenient to operate, the radiation dosage and time can be accurately controlled in the impurity removal process, the surface temperature of the polyester micro-plastic is effectively controlled, and production and popularization are easy.

The invention discloses a heat-aging-resistant automobile wire processing technology, belongs to the technical field of wire processing, and is used for solving the technical problem that the heat aging resistance and the mechanical property of an automobile wire need to be further improved in the prior art. According to the method, modified polyvinyl chloride is taken as a raw material, a modified elastomer and a modified inorganic filler are taken as reinforcing materials, an auxiliary additive is taken as an auxiliary agent, a modified sheath material is prepared through melt grafting, the sheath material is extruded on the surface layer of the symmetrical cable, and the automobile wire is obtained. The heat aging resistance and mechanical property of the automobile wire are improved, and the flame retardant property of the automobile wire is also improved.

The invention discloses an anti-aging flame-retardant polyvinyl chloride material and a preparation method thereof. The anti-aging flame-retardant polyvinyl chloride material comprises the following raw material components in parts by weight: 100 parts of PVC resin, 0.6-2.4 parts of a lubricant, 15-27 parts of a plasticizer and 14-25 parts of a composite flame-retardant anti-aging reinforcing filler, wherein the composite flame-retardant anti-aging reinforcing filler is obtained by sequentially carrying out antioxidant loading and polymer grafting modification on a compound of graphene oxide, basic magnesium sulfate whiskers and mesoporous alumina. The prepared polyvinyl chloride has excellent aging resistance, flame retardance and mechanical strength, is good in thermal stability and excellent in comprehensive performance, and has a wide market application prospect.

The invention relates to the field of cables, and discloses a modified polyvinyl chloride composite material for cables and a preparation method thereof.The composite material comprises low-density polyethylene, polyvinyl chloride, ethylene-vinyl acetate copolymer, nitrile rubber, modified graphene oxide, modified nano calcium carbonate and auxiliaries; the modified graphene oxide is prepared by reacting acylating chlorination of graphene oxide with an anti-aging derivative, the anti-aging derivative is prepared by reducing a benzoxazole-containing intermediate generated by a reaction of 2-amino-4-bromophenol and 4-cyanobenzaldehyde to obtain an aminated benzoxazole-containing intermediate, then the aminated benzoxazole-containing intermediate reacts with p-phenylenediamine, and then the product reacts with 3-(3, 4-dichlorophenyl)-1, 2, 3-triazole-3-one to obtain the anti-aging graphene oxide. 2, 5-di-tert-butyl-4-hydroxyphenyl) propionyl chloride is subjected to a reaction to prepare the product. And the modified nano calcium carbonate is prepared by reacting phosphonitrilic chloride trimer with an amino silane coupling agent and 2-amino benzoxazole-5-borate and then grafting on the surface of the nano calcium carbonate. The composite material prepared by the invention has excellent flame retardance, heat resistance and long-acting oxidation resistance.

The invention relates to the technical field of cables, and provides an anti-aging insulated power cable. A conductor layer and an anti-aging outer sheath layer are sequentially arranged from inside to outside. The anti-aging outer sheath layer is prepared from the following raw materials in parts by weight: 55 to 65 parts of PVC (Polyvinyl Chloride) resin, 20 to 30 parts of ethylene propylene diene monomer, 10 to 15 parts of ethylene-vinyl acetate copolymer, 10 to 12 parts of modified kaolin, 18 to 20 parts of diisononyl phthalate, 4 to 5 parts of calcium-zinc composite stabilizer, 1.5 to 2 parts of antioxidant, 0.5 to 1 part of polyethylene wax and 0.5 to 0.7 part of calcium stearate; the modified kaolin is obtained by coating the surface of kaolin with nano silicon dioxide to obtain SiO2-coated kaolin and grafting the SiO2-coated kaolin with an ultraviolet absorbent. According to the anti-aging insulated power cable prepared in the invention, the problem that the ultraviolet absorbent may be decomposed, volatilized or migrated to fail in long-term use is solved, and the anti-aging stability of the insulating material in long-term operation is improved.

The application provides a high-voltage cable preparation method and a high-voltage cable. The preparation method comprises the following steps: preparing modified polyvinyl chloride, wherein the modified polyvinyl chloride comprises polyvinyl chloride and a filler added into the polyvinyl chloride; taking 100 parts by weight of the polyvinyl chloride as a base material, and the filler comprises the following components in parts by weight: 1-2 parts of polyethylene, 2-3 parts of a filler, 2-3 parts of a lubricant and 2-5 parts of a toughening agent; extruding the modified polyvinyl chloride on the outer surface of a smooth metal sheath layer to form a modified polyvinyl chloride sheath, and the modified polyvinyl chloride sheath is bonded to the smooth metal sheath layer; and the smooth metal sheath layer is wrapped on the outer surface of a cable core. The high-voltage cable preparation method can greatly improve the flame-retardant performance of the high-voltage cable.

The invention relates to the technical field of polyvinyl chloride, and discloses a preparation process of a high-strength and high-thermal-stability PVC (polyvinyl chloride) material for a decorative film, which comprises the following steps: mixing polyvinyl chloride, acrylonitrile-butadiene-styrene copolymer, cyano polyesteramide, a stabilizer, a plasticizer, an antioxidant and the like, extruding in a twin-screw extruder, and granulating, the PVC material with high strength and high thermal stability is obtained. The cyano polyesteramide can improve the compatibility between ABS and PVC, so that the material has better mechanical properties, the polyesteramide has a hyperbranched molecular chain structure and plays a certain role in toughening, the compatibility between ABS and PVC is better, the vicat softening temperature of the material is increased, the thermal stability of the material is enhanced, and when the cyano polyesteramide is applied to materials such as decorative films, the material has better mechanical properties. Decorative films and the like can have good heat resistance and are not prone to aging and yellowing.

The invention relates to a photo-thermal aging resistant photovoltaic cable and a preparation method thereof, and belongs to the technical field of high polymer materials. The photo-thermal aging resistant photovoltaic cable is composed of a conductor wire core, and an insulating layer, a filling layer and an outer sheath which are sequentially coated on the outer side of the conductor wire core, the outer sheath is prepared from the following raw materials in parts by weight: 80-120 parts of polyvinyl chloride resin, 3-5 parts of a modified anti-aging agent, 2-8 parts of a modified flame retardant, 1-3 parts of dioctyl phthalate, 10-20 parts of nano silicon dioxide, 1-3 parts of butyl stearate and 3-5 parts of zinc stearate; the photo-thermal aging resistant photovoltaic cable prepared by the invention not only has good ultraviolet ray and thermal aging resistant effects, but also has an excellent flame retardant effect.

The invention discloses a corrosion-resistant insulating aerial cable which sequentially comprises a conductor layer, an insulating layer, a shielding layer, a corrosion-resistant layer and an outer sheath from inside to outside. The conductor layer is an aluminum alloy stranded wire of which the surface is coated with an anti-oxidation coating; the insulating layer is made of crosslinked polyethylene doped with 3-5% of nano silicon dioxide; the corrosion-resistant layer is a fluoroplastic or polyurethane coating; and the outer sheath is polyvinyl chloride added with an antioxidant and an ultraviolet light absorber. The fluoroplastic coating is formed through electrostatic spraying, and the surface of the copper wire shielding layer is subjected to phosphating pretreatment; the doped nano material enhances the mechanical strength and ultraviolet resistance of the insulating layer; the spiral groove design accelerates drainage and reduces accumulated water corrosion.

The invention provides a polyvinyl chloride sheet defect detection method and system based on image recognition, and relates to the technical field of quality detection.The method comprises the steps that a plurality of detection area coordinates are preset in an image acquisition system, and through position mapping and real-time image calibration of the plurality of detection area coordinates, the detection area coordinates are obtained; and aligning the actually shot image with the detection areas of the polyvinyl chloride sheet, and generating a final defect result according to a detection result obtained by identifying each detection area. According to the method and the device, the technical problem that the reliability of an overall quality evaluation result is affected due to the fact that the traditional image detection method is limited in sheet feature extraction capability, the defect recognition accuracy is not high and local anomaly is difficult to position is solved, and the reliability of the overall quality evaluation result is improved by constructing a multi-detection-area mapping mechanism based on a standard geometric template. And in combination with image registration, feature recognition and defect judgment algorithms, the detection precision of sheet defects is improved, so that the recognition accuracy of the quality state of the polyvinyl chloride sheet and the efficiency of the detection process are improved.

The invention discloses an industrial high-temperature-resistant cable, and belongs to the technical field of cables. The cable comprises a cable core and a sheath layer wrapping the cable core. The sheath layer comprises the following components in parts by weight: 32-38 parts of alkenyl polyvinyl chloride, 38-42 parts of methyl vinyl silicone rubber, 15-20 parts of modified basalt fibers, 1-2 parts of a vulcanizing agent, 6-10 parts of a plasticizer, 1-2 parts of a lubricant, 1-2 parts of a stabilizer and 0.3-0.8 part of an antioxidant. Functional modification is performed on the surface of the basalt fiber, so that the basalt fiber and a polymer matrix of the cable sheath can form a multi-layer and firm chemical structure, and the comprehensive performance of the sheath material is effectively improved.

The invention relates to the technical field of biological detection, and particularly discloses a test strip and a kit for detecting Alzheimer-related neurofilament protein AD7c-NTP. The detection test strip for the Alzheimer-related neurofilament protein AD7c-NTP provided by the invention comprises a PVC (Polyvinyl Chloride) bottom plate, a sample pad, a combination pad, a nitrocellulose membrane and a water absorption pad are arranged on the PVC bottom plate; a mouse anti-AD7c-NTP monoclonal antibody I marked by latex is contained on the combination pad; a detection line T and a quality control line C are arranged on the nitrocellulose membrane; the detection line T is coated with a mouse anti-AD7c-NTP monoclonal antibody II, and the quality control line C is coated with a goat anti-mouse IgG polyclonal antibody. The detection test strip for Alzheimer-related neurofilament protein AD7c-NTP provided by the invention has the advantages of high sensitivity, strong specificity, good stability and the like, can realize auxiliary diagnosis of Alzheimer's disease, and has a wide application prospect.

The invention relates to the technical field of plastic films, and provides a degradable plastic film and a preparation method thereof.The mode that microorganisms are placed between an inner layer film and an outer layer film in advance is adopted, auxiliary degradation of the degradable plastic film after use is achieved, the meeting and matching links of the degradable plastic film and the microorganisms in the external environment are reduced, and the degradation efficiency of the degradable plastic film is improved. The degradable plastic film is good in degradation environment matching performance and shorter in degradation period and comprises an inner-layer film and an outer-layer film, the inner-layer film and the outer-layer film are formed in a heating and rolling mode, a plurality of film-closing-free areas are arranged between the inner-layer film and the outer-layer film, microbial carriers are arranged in the multiple film-closing-free areas, and the microbial carriers are arranged between the inner-layer film and the outer-layer film. The inner layer film and the outer layer film are both formed by casting matrix plastic, and the matrix plastic is prepared from the following raw materials in parts by weight: 55 to 68 parts of polyvinyl chloride, 40 to 50 parts of polylactic acid, 22 to 28 parts of polyvinyl acetate, 15 to 20 parts of plant straw, 7 to 10 parts of ionic compound, 11 to 14 parts of flexibilizer, 14 to 20 parts of coupling agent and 13 to 16 parts of strength additive.

The invention provides a calcium-zinc stabilizer which comprises calcium salt, zinc salt and nanoparticles, and the content of the nanoparticles is 10-40wt%. The calcium-zinc stabilizer provided by the invention is applied to a composite material containing a PVC (Polyvinyl Chloride) base material, especially to other polymer base materials with poorer compatibility with the PVC base material; by adding the calcium-zinc stabilizer into the PVC base material, the mechanical strength performance of the prepared composite material, such as a PVC / PLA composite material, can be remarkably improved.

The invention discloses a PVC (polyvinyl chloride) board with heat insulation, sound insulation and heat preservation functions. The PVC board is prepared from the following raw materials in parts by weight: 100 parts of PVC resin powder, 10-23 parts of plasticizer, 2.5-6 parts of stabilizer, 1-3 parts of barite powder, 4-15 parts of maleic anhydride grafted polypropylene and 3.5-10 parts of composite filler. The PVC board provided by the invention not only has excellent heat insulation and sound insulation properties, but also has good anti-aging and antistatic properties, and is high in mechanical strength and good in flame retardant property. The composite filler provided by the invention can significantly improve the heat insulation performance, sound insulation performance, flame retardant performance and aging resistance of PVC, also can ensure the mechanical strength of PVC, and can endow the PVC with good antistatic performance; the PVC board is endowed with excellent ultraviolet aging resistance and thermo-oxidative aging resistance through the composite filler, so that the PVC board can be better applied to an outdoor environment; the antistatic performance is endowed, so that the application scene can be widened.

The invention relates to the technical field of cable preparation, in particular to a low-temperature-resistant flame-retardant anti-ultraviolet PVC cable sheath composition, a preparation method thereof and a cable. According to the composition, polyvinyl chloride is used as a matrix, chlorinated polyethylene elastomer, an environment-friendly plasticizer and a calcium-zinc stabilizer are used as auxiliary materials, nanoscale magnesium hydroxide, zinc stannate, passivated zinc borate, sodium tungstate and modified montmorillonite are introduced to form a multi-component synergistic flame-retardant system, and the flame retardance, the low smoke property and the thermal stability of the material are remarkably improved. Meanwhile, through the cooperation of the ultraviolet light absorber and the antioxidant, the weather resistance of the material is enhanced, and the service life of the material is prolonged. The prepared cable sheath material has excellent low-temperature flexibility, flame retardance and smoke suppression performance and ultraviolet aging resistance, and is suitable for high-performance cables in severe environments.

The invention relates to the technical field of power cables, and provides a corrosion-resistant insulated power cable which sequentially comprises a conductor, an insulating layer and a sheath layer from inside to outside, and the sheath layer comprises the following raw materials in parts by weight: 70-80 parts of polyethylene, 20-25 parts of polyvinyl chloride, 10-15 parts of filler, 6-8 parts of a compatilizer, 1-3 parts of a plasticizer, 0.5-1.5 parts of an antioxidant, 1-2 parts of a lubricant and 1-2 parts of a cross-linking agent. The filler comprises the following raw materials in parts by weight: 60-70 parts of talcum powder, 30-40 parts of kaolin and 8-10 parts of a nitrogen-containing fluorinated aromatic compound. According to the technical scheme, the problem of poor corrosion resistance of the insulated power cable in the prior art is solved.

The invention discloses an HPVC power cable protection pipe and a preparation method thereof, and relates to the technical field of cable protection pipes. The HPVC power cable protection tube is at least prepared from the following raw materials in parts by weight: 100 parts of high-strength polyvinyl chloride, 35 to 45 parts of epoxy acrylate rubber, 5 to 8 parts of vinyl chloride-g-acrylate copolymer, 8 to 12 parts of epoxidized soybean oil, 3 to 5 parts of calcium-zinc composite stabilizer, 5 to 15 parts of modified hydrotalcite, 0.1 to 0.5 part of beta-diketone, 0.8 to 1.5 parts of calcium stearate and 10 to 20 parts of flame retardant. 12 to 15 parts of modified nano calcium carbonate, 5 to 8 parts of talcum powder, 0.6 to 1.2 parts of antioxidant, 1 to 2 parts of anti-aging agent 4010 and 0.5 to 1.5 parts of ultraviolet light absorber UV531; the modified hydrotalcite is obtained by adding a mixed solution of calcium nitrate and lanthanum nitrate, a sodium hydroxide solution and a sodium bicarbonate solution into a lauryl sodium sulfate solution, mixing and aging, and then carrying out a post-treatment process. The HPVC power cable protection tube prepared by the invention has relatively high strength, good mechanical properties, weather resistance and cold resistance, and long service life.

The invention relates to the technical field of cable preparation, and provides a high-temperature-resistant flame-retardant cable, which comprises a cable core, and an insulating layer and a sheath layer which sequentially coat the cable core from inside to outside, the sheath layer is prepared from the following components in parts by weight: 8 to 10 parts of ethylene-vinyl acetate copolymer, 15 to 18 parts of ethylene-acrylate copolymer, 15 to 18 parts of polyvinyl chloride resin, 15 to 20 parts of filler, 10 to 12 parts of modified glass fiber, 3 to 4 parts of maleic anhydride grafted polyethylene, 0.5 to 1 part of ultraviolet absorbent, 1 to 2 parts of antioxidant and 1 to 2 parts of coupling agent. The cable has the beneficial effects that through introduction of the modified glass fiber and the functional monomer, the mechanical property and the flame retardant grade of the cable are improved, and the stability of the cable in a high-temperature environment is also remarkably enhanced.

To provide a synthetic resin canvas (and a method for producing the same) having cotton canvas appearance, stable in balance of warp and weft dimensions, and hardly causing dimensional change.SOLUTION: A synthetic-resin canvas having a mass of 360 to 800g / m2, the synthetic-resin canvas being obtained by providing a soft vinyl chloride-resin-impregnated coating layer on an entire surface of a fabric, wherein the fabric is a plain weave fabric, a twill weave fabric, or a satin weave fabric, and a 10% tensile stress in a widthwise direction of the synthetic-resin canvas is 90 to 110% of a 10% tensile stress in a processing direction. Especially, the fabric is composed of a short fiber spun yarn, a combination of a short fiber spun yarn and a long fiber multifilament bulky yarn, or a long fiber multifilament bulky yarn, and the difference between the total fineness per inch (dtex / inch) of the weft yarn group and the total fineness per inch (dtex / inch) of the warp yarn group is within ± 10%.SELECTED DRAWING: None

The invention belongs to the technical field of PVC film recycling, and discloses a PVC film waste recycling and reprocessing device which comprises a treatment bin and further comprises a crushing assembly arranged in the treatment bin and a waste recycling assembly arranged in the treatment bin. The conveying equipment is mounted at the bottom of the treatment bin; and the circulating assembly is mounted at the side part of the treatment bin. PVC film waste is injected into the treatment bin, a driving motor drives a rotating roller to rotate, a PVC film is crushed through crushing teeth, the PVC film is wound outside the rotating roller and the crushing teeth in the crushing process, and when the crushing teeth rotate to the lower end, a transmission rod is guided through a guide piece at the moment, so that a connecting piece and a cleaning piece move upwards along a transverse groove, and the PVC film is cleaned. And the cleaning piece is in contact with the side parts of the crushing teeth, so that the PVC thin film wound on the side parts of the crushing teeth is cut through the cleaning piece, the PVC thin film is prevented from being wound outside the rotating roller and the crushing teeth, and the crushing efficiency of the PVC thin film is improved.

The invention belongs to the technical field of waste plastic cracking, and particularly relates to a PVC cracking dechlorination method and a catalyst used in the method. The used catalyst is X / ZSM-5; and the mass of the active component X is 8-16 wt% of the ZSM-5 molecular sieve. And adding a ZSM-5 molecular sieve into the precursor X salt solution, heating in a water bath, stirring, carrying out rotary evaporation, drying and roasting to obtain the catalyst. In the PVC cracking dechlorination method, PVC is pretreated and then crushed into solid particles, the solid particles are put into a high-pressure feeding pipe, and a catalyst X / ZSM-5 is put into a fluidized bed; and after fluidizing the catalyst, blowing PVC into the reactor, and reacting in an inert gas atmosphere to obtain an oil product and olefin. According to the catalyst disclosed by the invention, the active components are in the pore channels and the outer surfaces of the molecular sieves, so that the preparation method is simple, HCl in high-temperature cracked oil gas can be fixed, the chlorine content in a gas-phase product and a liquid oil product can be reduced, the reaction time is short, the cost is low, the dechlorination process is strong, and the added value of the product is high.

The invention relates to the technical field of rubber-plastic composite flame-retardant materials, and provides a graphite rubber-plastic composite flame-retardant material and a preparation method thereof.The preparation method comprises the following processes that nitrile rubber, polyvinyl chloride, dioctyl phthalate, modified expandable graphite, a stabilizer, sulfur and an anti-aging agent are added into a high-speed mixer and mixed to be uniform, and a premix is obtained; and feeding the premix into a double-screw extruder, and carrying out melt blending, extrusion and vulcanization to obtain the composite flame-retardant material. The preparation method has the beneficial effects that the modifier is combined with the expansible graphite and compounded with the nitrile rubber, the polyvinyl chloride and other base materials, so that the flame retardant property and the mechanical property of the prepared composite material are remarkably improved.

The invention relates to the technical field of fireproof cables, and provides an aluminum alloy core fireproof cable and a preparation process thereof. An aluminum alloy core fireproof cable comprises a conductor, an insulating layer, a filling layer, a bundling heat insulation layer, an isolation layer, a fireproof layer and a sheath layer which are sequentially arranged from inside to outside, and the sheath layer comprises the following raw materials in parts by weight: 100 parts of polyvinyl chloride, 10-15 parts of a plasticizer, 10-15 parts of an ethylene-vinyl acetate copolymer, 25-30 parts of a flame retardant, 0.5-1.5 parts of an antioxidant, 10-20 parts of a filler and 0.5-1 part of a lubricant. The preparation method of the flame retardant comprises the following steps: mixing calcium oxide, magnesium oxide and zinc oxide, carrying out solid solution annealing to obtain a solid solution, and mixing the solid solution with aluminum hydroxide, ammonium polyphosphate and a metal acetylacetonate complex to obtain the flame retardant. According to the technical scheme, the problem of insufficient flame retardant property of the fireproof cable in the prior art is solved.

The invention discloses a low-temperature curing PVC plastisol composition for a vehicle and a preparation method of the low-temperature curing PVC plastisol composition. The invention relates to a low-temperature curing PVC plastisol composition for vehicles, which is prepared from the following raw materials in parts by weight. Comprising 5 to 15 parts of polyvinyl chloride-vinyl acetate copolymer resin, 5 to 15 parts of homopolymerized PVC paste resin, 1 to 10 parts of blended PVC paste resin, 30 to 40 parts of a compound plasticizer, 1 to 10 parts of a hydrocarbon solvent, 0.5 to 1.5 parts of terminated polyurethane, 0.5 to 2 parts of polyamide, 0.5 to 1 part of a thixotropic agent, 30 to 45 parts of an inorganic filler, 1 to 5 parts of a stabilizer and 1 to 5 parts of a moisture absorbent. The compound plasticizer is prepared from diethylene glycol dibenzoate, isodecyl benzoate and diisononyl phthalate. The PVC plastisol composition disclosed by the invention is a low-temperature and short-time curing material, and can be cured under the conditions that the baking temperature is 125 DEG C and the baking time is 20 minutes.

The invention discloses a comprehensive control method and system for the extrusion molding process of a PVC skinning and foaming sectional material, and relates to the technical field of plastic sectional material machining. The control method comprises the steps that real-time operation data of all links of the whole process of the PVC skinning and foaming sectional material are collected; a fusion type prediction model is built by using historical production operation data, and the fusion type prediction model combines two data processing modes. According to the comprehensive control method and system for the extrusion molding process of the PVC skinning and foaming profile, the parameter deviation trend is captured in advance by fusing the prediction model and the cooperative control technology, that is, when the environment temperature changes abnormally, the model can pre-judge the fluctuation direction of the decomposition rate of the foaming agent, and the decomposition rate of the foaming agent is determined. A regulation and control instruction is sent to the extruder and the ultrasonic vibration device in advance, the temperature and vibration parameters of the foaming area are synchronously and finely adjusted, and foam hole form abnormity is avoided; for different scene requirements, the dynamic quality evaluation system can flexibly allocate index weights, and it is ensured that each batch of profiles can be accurately matched with the requirements.

The invention provides an ultra-high molecular weight polyethylene fiber woven reinforced polyethylene / polyvinyl chloride composite pipe and a preparation method thereof. The composite pipe is of a five-layer composite structure and comprises a high-density polyethylene core pipe on the inner layer, an ultra-high molecular weight polyethylene fiber woven reinforcement layer on the middle layer, a polyvinyl chloride coated pipe on the outer layer, a first adhesive layer and moisture curing reaction type polyurethane hot melt adhesive on the second adhesive layer. The preparation method of the composite pipe comprises the steps of inner layer core pipe preparation, polyurethane hot melt adhesive coating, fiber woven reinforcement layer forming, secondary polyurethane hot melt adhesive coating, outer layer wrapping and the like. The fiber performance is protected by adopting a low-temperature process, and efficient bonding is realized; the ultra-high molecular weight polyethylene fibers are alternately woven and wound to form the grid reinforcing layer, so that the pipe is endowed with high strength and impact resistance. The problems that a traditional composite pipe is prone to layering between layers, insufficient in pressure bearing capacity, complex in construction connection and the like are solved, and the composite pipe has the advantages of being high in strength, resistant to corrosion, easy to connect and the like.

The invention provides a mirror PVC (polyvinyl chloride) composite film and a preparation method thereof, the PVC film is provided with a forming surface and a non-forming surface which are deviated from each other, and the PET film is arranged on the forming surface of the PVC film in a tearable manner. The mirror surface PVC film has the beneficial effects that the synergistic effect of the tearable PET film and the online optical-grade PET laminating process is innovatively adopted, so that the breakthrough improvement of the performance of the mirror surface PVC film is realized; the smooth and matt surface of the PVC film is isolated by the PET film, so that molecular migration extinction caused by contact of the smooth and matt surface is effectively inhibited, the problem of gloss attenuation after storage and transportation of a traditional product is solved, and the mirror surface effect is ensured for a long time in a conventional storage environment; meanwhile, the optical-grade PET film is arranged on the forming surface of the PVC film in an online laminating mode, so that the secondary calendering and brightening coating procedures of a mirror surface roller are omitted, calendering-laminating-rolling integrated production is realized, the mirror surface effect of a product is formed at one time, the production process is simplified, the production line speed is increased, the production efficiency is greatly improved, and the comprehensive production cost is reduced.

The utility model discloses a waterproof moisture-proof underground power transmission cable, which relates to the technical field of power transmission cables and comprises a polyvinyl chloride outer sheath, a polyvinyl chloride (PVC) inner sheath and a cable core, a cross-linked polyethylene insulating sleeve is arranged on the outer side of the cable core, and woven filler is arranged between the cable core and the PVC inner sheath. A waterproof sleeve, an outer semiconductor shielding sleeve and a water swelling strip are sequentially arranged on the outer side of the PVC inner sheath from inside to outside in a contact mode, annular grooves are formed in the outer side of the water swelling strip in the axis direction of the water swelling strip at intervals, V-shaped dredging grooves are symmetrically formed in the two sides of each annular groove, and the interiors of the annular grooves and the interiors of the V-shaped dredging grooves are communicated. According to the scheme, the water swelling strip is arranged between the polyvinyl chloride outer sheath and the outer semiconductor shielding sleeve, after water seepage occurs in the cable, the water swelling strip can continuously absorb water to swell, then irregular gaps in splicing seams can be formed, and the water stopping and waterproof effects are achieved.

The invention discloses a PVC film coating uniformity detection method based on spectral analysis, and relates to the technical field of optical detection, and the method comprises the following steps: S001, adopting a controllable incident illumination system with a multi-angle rotation function to carry out continuous angle scanning on the surface of a PVC film, collecting reflection spectrum intensity data in a corresponding wave band range according to different incident angles, and generating a spectrum data matrix containing interference characteristics; and S002, carrying out continuous wavelet transform processing on the spectral data matrix, carrying out multi-scale local decomposition on a spectral response signal, extracting and separating a periodic interference characteristic signal, and obtaining a purified spectral matrix after interference reduction. According to the method, through multi-angle spectrum collection and interference feature stripping, accurate identification of a coating thickness abnormal area and combination of strength indexes, spraying parameters are regulated and controlled, a detection-compensation-reinspection closed-loop mechanism is constructed, interference misjudgment is effectively avoided, and the accuracy and regulation and control efficiency of uniformity detection of the PVC film coating are improved.