CN114865556B - Light high-strength MPP corrugated pipe - Google Patents
Light high-strength MPP corrugated pipe Download PDFInfo
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- CN114865556B CN114865556B CN202210609854.4A CN202210609854A CN114865556B CN 114865556 B CN114865556 B CN 114865556B CN 202210609854 A CN202210609854 A CN 202210609854A CN 114865556 B CN114865556 B CN 114865556B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/02—Details
- H02G3/06—Joints for connecting lengths of protective tubing or channels, to each other or to casings, e.g. to distribution boxes; Ensuring electrical continuity in the joint
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/02—Details
- H02G3/04—Protective tubing or conduits, e.g. cable ladders or cable troughs
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G9/00—Installations of electric cables or lines in or on the ground or water
- H02G9/06—Installations of electric cables or lines in or on the ground or water in underground tubes or conduits; Tubes or conduits therefor
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/322—Ammonium phosphate
- C08K2003/323—Ammonium polyphosphate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K2201/011—Nanostructured additives
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/18—Applications used for pipes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/062—HDPE
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
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Abstract
The invention belongs to the technical field of electric pipelines, and discloses a light high-strength MPP corrugated pipe, which comprises a corrugated pipe main body, wherein one end of the corrugated pipe main body is provided with an axially extending straight pipe section, the other end of the corrugated pipe main body is fixedly connected with a connector, the straight pipe section and the connector are matched to complete rapid assembly and fixation of the light high-strength MPP corrugated pipe, the corrugated pipe main body comprises an outer pipe body and an inner pipe body, the outer wall of the outer pipe body is provided with a corrugated annular bulge, the inner wall of the inner pipe body is a smooth circular arc surface, the outer pipe body and the inner pipe body are integrally formed through a corrugated pipe forming die after being extruded through a composite extrusion die head of an extruder, and the outer pipe body is made of a compression-resistant weather-resistant modified polypropylene material. According to the invention, through the improvement of the structure and the material of the MPP corrugated pipes, on one hand, the quick assembly and the fixation of the two MPP corrugated pipes are realized, the installation efficiency is improved, and on the other hand, the production cost of the MPP corrugated pipes is reduced, and the comprehensive performance of the MPP corrugated pipes is improved.
Description
Technical Field
The invention relates to the technical field of power pipelines, in particular to a light high-strength MPP corrugated pipe.
Background
There are two types of conventional power pipes on the market, namely an MPP power pipe and a CPVC power pipe. MPP power pipes are divided into excavation type and non-excavation type, the MPP power pipes adopt modified polypropylene as main raw materials, and the MPP power pipes are construction projects such as laying pipelines, cables and the like in special areas such as roads, railways, buildings, riverbeds and the like without large amounts of dredge, soil excavation and pavement damage. Compared with the traditional 'trenching pipe burying method', the trenchless power pipe engineering is more suitable for the current environmental protection requirement, and removes dust flying, traffic jam and other disturbing factors caused by the traditional construction. The MPP power tube has excellent electrical insulation, higher thermal deformation temperature and low-temperature impact performance, higher tensile and compressive properties than HDPE, light weight, smoothness, small friction main force and thermal fusion welding butt joint. The CPVC power tube uses PVC resin with excellent heat resistance and insulating property as a main material, and has the characteristics of high strength, good flexibility, high temperature resistance, corrosion resistance, flame retardance, good insulating property, no pollution, difficult aging, light weight, convenient construction and the like. The method is widely used for urban power grid construction and transformation; urban municipal engineering; civil aviation airport engineering construction; engineering park and district engineering construction; the urban street lamp cable is laid in traffic and road and bridge engineering construction, and plays a role in guiding and protecting.
Although the two power pipes have the advantages, the MPP power pipe is made of PP material, so that the MPP power pipe has high manufacturing cost, and the CPVC power pipe has high processing difficulty, great environmental pollution and poor shock resistance. Therefore, it is necessary to combine the advantages of the MPP power pipe and the CPVC power pipe to develop a power pipe with low cost and good comprehensive performance. Meanwhile, the existing MPP power tube is subjected to hot-melt welding, a heating tool is required to be used for heating and flaring the bell mouth of the MPP power tube in advance during installation, the operation is labor-consuming, and in most cases, the MPP power tube is installed in a narrow environment, so that the operation of hot-melt welding is inconvenient, the structure of the existing MPP power tube is required to be improved, and the MPP power tube which can be quickly installed and sealed without hot melting is required to be obtained.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide the light high-strength MPP corrugated pipe, two ends of the existing MPP corrugated pipe are changed, connectors are arranged, and the sealing strips arranged in a rotating annular array form to seal the locking of the straight pipe sections of the MPP corrugated pipe, so that the two MPP corrugated pipes are quickly assembled and fixed, meanwhile, the single-layer structure of the existing MPP corrugated pipe is changed, the outer corrugated pipe is changed into the inner corrugated pipe with the inner corrugated pipe, the materials of the inner pipe and the outer corrugated pipe are further improved, the outer corrugated pipe has higher compressive strength and weather resistance, the inner corrugated pipe has higher toughness and flame resistance, the consumption of polypropylene is reduced, the production cost of the MPP corrugated pipe is reduced, and the comprehensive performance of the MPP corrugated pipe is improved.
The aim of the invention can be achieved by the following technical scheme:
a light high-strength MPP corrugated pipe comprises a corrugated pipe main body, wherein one end of the corrugated pipe main body is provided with an axially extending straight pipe section, the other end of the corrugated pipe main body is fixedly connected with a connector, and the straight pipe section and the connector are matched to complete rapid assembly and fixation of the light high-strength MPP corrugated pipe;
the corrugated pipe main body comprises an outer pipe body and an inner pipe body, the outer wall of the outer pipe body is provided with a corrugated annular bulge, the inner wall of the inner pipe body is a smooth circular arc surface, and the outer pipe body and the inner pipe body are integrally formed through a corrugated pipe forming die after being extruded through a composite extrusion die head of an extruder.
Preferably, the connector includes annular seat, annular seat one end and bellows main part fixed connection, be equipped with radial outside annular mounting groove that extends in the middle of the annular seat, be equipped with a plurality of sealing strips that are annular array setting along annular seat centre of a circle in the annular mounting groove, the sealing strip is cylindric, sealing strip is close to bellows main part one end and annular seat inner wall fixed connection, bellows main part one end and spacing ring fixed connection are kept away from to the sealing strip, spacing ring and annular seat rotate to be connected, spacing ring upper side limit is equipped with the worm wheel dish, spacing ring top level is provided with the worm, the worm cooperates with the worm wheel dish, worm both ends and drive box rotate to be connected, drive box fixed mounting is at annular seat outer wall, worm one end runs through the drive box, the interior hexagonal drive hole has been seted up to worm runs through drive box one end tip.
Preferably, the annular bulge is internally sheathed with a reinforcing rib, the reinforcing rib is a metal ring, the reinforcing rib is arranged in a corrugated pipe forming die in advance, and the reinforcing rib and the annular bulge are integrally formed during extrusion molding of the corrugated pipe.
Preferably, the outer pipe body is a compression-resistant weather-resistant modified polypropylene material, and the compression-resistant weather-resistant modified polypropylene material comprises the following components in parts by weight:
72-95 parts of polypropylene, and the balance of the polypropylene,
12-26 parts of POE,
α-Al 2 O 3 9-15 parts of g-PMMA,
4-8 parts of modified sericite,
0.1 to 1 part of sodium stearate,
1-5 parts of exocarpium citri rubrum master batch;
the preparation method of the compression-resistant weather-resistant modified polypropylene material comprises the following steps:
s1, alpha-Al 2 O 3 Adding g-PMMA, modified sericite and sodium stearate into a mixing device for mixing to obtain a primary mixture, adding the primary mixture, polypropylene, POE and exocarpium Citri rubrum master batch into a high-speed mixer for stirring at 250-400rpm for 10-15min, and uniformly mixing to obtain an integral mixture;
s2, adding the whole mixture into a double-screw extruder for blending extrusion, and granulating to obtain the granular compression-resistant weather-resistant modified polypropylene material.
Preferably, the twin-screw extruder has a screw speed of 200-300rpm, zone I temperature of 170-180deg.C, zone II temperature of 180-195 deg.C, zone III temperature of 195-210 deg.C, zone IV temperature of 195-210 deg.C, and extrusion die temperature of 200-210 deg.C.
Preferably, alpha-Al 2 O 3 -g-PMMA is surface grafted MMA polymerization modified nano alumina, and the preparation method comprises the following steps:
(1) The method comprises the steps of carrying out a first treatment on the surface of the alpha-Al 2 O 3 Adding the powder into absolute ethanol, adding silane coupling agent KH-550, performing ultrasonic dispersion for 10-20min, heating to 75-85deg.C, refluxing for 1-3 hr, centrifuging, washing, and vacuum drying to obtain pretreated surface modified alpha-Al 2 O 3 A powder;
(2) Surface-modified alpha-Al obtained in the step (1) 2 O 3 Adding methyl methacrylate into the powder, performing ultrasonic dispersion for 10-20min, adding azodiisobutyronitrile, performing water bath reaction at 60-70 ℃ for 12-18h, heating to 100 ℃ for reaction for 1-3h, cooling to room temperature, performing suction filtration, and drying to obtain the surface grafted MMA polymerization modified alpha-Al 2 O 3 。
Preferably, the modified sericite is antioxidant BHT intercalated modified sericite, and the preparation method comprises the following steps:
A. heating a high-temperature resistance furnace to 800-1000 ℃ at a speed of 8-15 ℃/min, then placing sericite, preserving heat for 1-2 hours, taking out, and naturally cooling to room temperature to obtain activated sericite;
B. adding activated sericite into 8-12mol/L nitric acid according to a solid-to-liquid ratio of 2-4%, heating to 80-90 ℃, acidizing for 2-4 hours, washing with deionized water, and suction filtering until filtrate is neutral to obtain acidified sericite;
C. adding acidified sericite into NaCl saturated solution according to solid-liquid ratio of 8-10%, heating to 90-95 ℃ for 1-3h, standing for 6-12h, and filtering to obtain nano-sized sericite;
D. dissolving an antioxidant BHT in an ethanol solution, adding the nano-modified sericite into the antioxidant BHT solution, heating to 90-95 ℃, performing ultrasonic treatment for 2-4 hours, washing, suction filtering and drying to obtain the BHT intercalation modified sericite.
Preferably, the inner pipe body is a high-toughness flame-retardant polyethylene-polypropylene composite material, and the high-toughness flame-retardant polyethylene-polypropylene composite material comprises the following raw materials in parts by weight:
40-55 parts of high-density polyethylene,
12-22 parts of ethylene propylene diene monomer rubber,
20-35 parts of polypropylene, and the total weight of the polypropylene,
3-5 parts of SEBS (styrene-ethylene-butylene-styrene),
nano CaCO 3 4-8 parts of a water-soluble polymer,
2-5 parts of composite intumescent flame retardant,
0.1 to 0.5 part of antioxidant,
0.2-2 parts of compatilizer,
1-5 parts of carbon black master batch;
the preparation method of the high-toughness flame-retardant polyethylene-polypropylene composite material comprises the following steps: SEBS and nano CaCO 3 Mixing the expansion flame retardant, the antioxidant and the compatilizer, adding the mixture into a double-screw extruder together with high-density polyethylene, ethylene propylene diene monomer, polypropylene and carbon black master batch particles for blending extrusion, and granulating to obtain the granular compression-resistant weather-resistant modified polypropylene material, wherein the rotation speed of a screw of the double-screw extruder is 250-350rpm, the temperature of a first zone is 160-180 ℃, the temperature of a second zone is 175-190 ℃, the temperature of a third zone is 190-205 ℃, the temperature of a fourth zone is 195-210 ℃, and the temperature of an extrusion die is 200-210 ℃.
Preferably, the composite intumescent flame retardant is prepared by mixing piperazine phosphate char forming agent and single-component intumescent flame retardant according to a mass ratio of 1:2-3, and the preparation method comprises the following steps:
a. adding amino trimethylene phosphoric acid and piperazine into deionized water according to a molar ratio of 1:1, stirring and reacting for 1-2h at 38-42 ℃, and washing and drying a product after reduced pressure distillation to obtain a piperazine phosphate carbonizing agent;
b. under the condition of magnetic stirring, dissolving sulfanilic acid in deionized water at 90-95 ℃, dripping aminoethylpiperazine into the sulfanilic acid solution at a constant titration rate, reacting for 2-4 hours under heat preservation, and obtaining piperazine sulfonate after reduced pressure distillation, suction filtration and drying;
c. adding ammonium polyphosphate into 70-80V/V% ethanol solution, stirring for 10-12h, adding piperazine sulfonate obtained in the step b into the solution, carrying out reflux reaction at 90-95 ℃ for 1-3h, and carrying out suction filtration, washing and drying to obtain a single-component intumescent flame retardant;
d. and d, mixing the piperazine phosphate char-forming agent obtained in the step a with the single-component intumescent flame retardant obtained in the step c in proportion to obtain the composite intumescent flame retardant.
Preferably, the antioxidant is one or a combination of more of hindered phenol stabilizers, phosphite stabilizers and thioester antioxidants;
the compatilizer is one or a combination of more of polypropylene grafted maleic anhydride, polypropylene grafted carboxylic acid, chlorinated polypropylene, polypropylene grafted glycidyl methacrylate, polyethylene grafted maleic anhydride and methacrylic acid-styrene-butadiene polymer.
The invention has the beneficial effects that:
1. the light high-strength MPP corrugated pipe comprises a corrugated pipe main body, wherein one end of the corrugated pipe main body is provided with an axially extending straight pipe section, and the other end of the corrugated pipe main body is fixedly connected with a connector;
2. the light high-strength MPP corrugated pipe outer pipe body adopts compression-resistant weather-resistant modified polypropylene material and is prepared from elastomer POE and alpha-Al 2 O 3 The g-PMMA, the modified sericite and the polypropylene are blended and modified, so that the ageing resistance, the compression resistance and the impact resistance of the outer pipe body are obviously improved; wherein the reverse is adoptedMethod for compatibilization and method for preparing alpha-Al 2 O 3 Method for grafting modification of surface, aiming at improving polypropylene and alpha-Al 2 O 3 When alpha-Al 2 O 3 When uniformly added into a polypropylene matrix, the inorganic filler not only can reduce the application cost of the high polymer, but also has obvious effect on improving the tensile property and the impact resistance of polypropylene, simultaneously can induce the polypropylene to crystallize, has heterogeneous nucleation effect on beta-crystal, can reduce the transformation rate of beta-crystal orientation alpha-crystal, promotes the formation and the maintenance of beta-crystal, and the elastomer POE and alpha-Al 2 O 3 The aim of synergistically toughening and reinforcing polypropylene is fulfilled; in addition, the sericite can be subjected to heat activation, acidification and sodium treatment, so that the sericite sheet activity can be improved, the intercalation effect of the antioxidant BAT is improved, and the tensile and bending properties of the polypropylene in the thermal oxidation and ultraviolet ageing processes can be improved by adding the antioxidant BAT intercalation modified sericite into the polymer, so that the weather resistance of the material is improved.
3. The inner pipe body of the light high-strength MPP corrugated pipe adopts a high-toughness flame-retardant polyethylene-polypropylene composite material, and is compounded with polypropylene by high-density polyethylene, and ethylene propylene diene monomer rubber, SEBS and nano CaCO are added 3 And the composite intumescent flame retardant is blended and modified, so that the bending performance and flame retardant performance of the inner pipe body are obviously improved; the SEBS is added as a modifier to promote the dispersion of the nano calcium carbonate in the polymer matrix, so that the interaction between the polymer and the nano calcium carbonate is increased, and the composite material with better impact toughness is obtained; in the composite intumescent flame retardant, MAPP and ATPIP show a synergistic intumescent flame retardant mechanism, on the one hand, diluting the concentration of combustible gas by generating non-combustible gas and phosphorus oxygen free radicals and terminating the free radical chain combustion reaction; on the other hand, by forming an expanded and compact carbon layer containing P-C-N and P-O-C structures, the heat and oxygen exchange between the matrix and the outside is isolated, and the matrix is prevented from further burning, so that the flame retardant property of the material is improved.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic view of the overall structure of a lightweight high-strength MPP bellows of the present invention;
FIG. 2 is a cross-sectional view of a lightweight high-strength MPP bellows of the present invention;
FIG. 3 is a schematic cross-sectional view of a lightweight high-strength MPP bellows joint of the present invention;
FIG. 4 is a cross-sectional view of a lightweight high-strength MPP bellows in another embodiment of the present invention;
fig. 5 is a schematic view of the lightweight high-strength MPP bellows installation of the present invention.
In the figure:
the corrugated pipe comprises a corrugated pipe body 1, an outer pipe body 101, an annular protrusion 1011, a reinforcing rib 1012, an inner pipe body 102, a straight pipe section 2, a connector 3, an annular seat 301, an annular mounting groove 302, a sealing strip 303, a limiting ring 304, a worm wheel disc 305, a worm 306 and a driving box 307.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the embodiments of the present invention and the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the terms "open," "upper," "lower," "thickness," "top," "middle," "length," "inner," "peripheral," and the like indicate orientation or positional relationships, merely for convenience in describing the present invention and to simplify the description, and do not indicate or imply that the components or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
As shown in fig. 1-2, a light high-strength MPP corrugated pipe comprises a corrugated pipe main body 1, wherein one end of the corrugated pipe main body 1 is provided with an axially extending straight pipe section 2, the other end of the corrugated pipe main body 1 is fixedly connected with a connector 3, and the straight pipe section 2 and the connector 3 are matched to complete rapid assembly and fixation of the light high-strength MPP corrugated pipe;
the corrugated pipe body 1 comprises an outer pipe body 101 and an inner pipe body 102, wherein corrugated annular protrusions 1011 are arranged on the outer wall of the outer pipe body 101, the inner wall of the inner pipe body 102 is a smooth circular arc surface, and the outer pipe body 101 and the inner pipe body 102 are integrally formed through a corrugated pipe forming die after being extruded through a composite extrusion die head of an extruder.
As shown in fig. 3, the connector 3 includes an annular seat 301, one end of the annular seat 301 is fixedly connected with the bellows main body 1, an annular mounting groove 302 extending radially outwards is provided in the middle of the annular seat 301, a plurality of sealing strips 303 arranged in an annular array along the center of the annular seat 301 are provided in the annular mounting groove 302, the sealing strips 303 are cylindrical, one end of the sealing strips 303 close to the bellows main body 1 is fixedly connected with the inner wall of the annular seat 301, one end of the sealing strips 303 far away from the bellows main body 1 is fixedly connected with a limiting ring 304, the limiting ring 304 is rotationally connected with the annular seat 301, a worm wheel disc 305 is provided on the upper side edge of the limiting ring 304, a worm 306 is horizontally arranged above the limiting ring 304 and is matched with the worm wheel disc 305, two ends of the worm 306 are rotationally connected with a driving box 307, one end of the worm 306 penetrates through the driving box 307, and an inner hexagonal driving hole is provided at one end of the worm 306 penetrates through the driving box 307.
As shown in fig. 4, as another embodiment of the present invention, the annular protrusion 1011 is internally covered with the reinforcing rib 1012, the reinforcing rib 1012 is a metal ring, the reinforcing rib 102 is previously placed in the bellows molding die, and is integrally molded with the annular protrusion 1011 at the time of extrusion molding of the bellows.
As shown in fig. 5, when the light high-strength MPP bellows of the present invention is installed, the straight pipe section 2 of one light high-strength MPP bellows is inserted into the connector 3 of the other light high-strength MPP bellows, then the worm 306 is driven to rotate by the hexagonal wrench in the inner hexagonal driving hole at the end of the worm 306, and the limit ring 304 is driven to rotate by the cooperation of the worm 306 and the worm wheel disc 305, and since one end of the sealing strip 303 is fixed to the inner wall of the annular seat 301 and the other end is fixed to the limit ring 304, when the limit ring 304 rotates, the sealing strip 303 arranged in the annular array is driven to be screwed up towards the inner straight pipe section 2 to form the effect similar to twist, so that the sealing strip 303 is tightly wound on the outer wall of the straight pipe section 2, on one hand, and on the other hand, the two light high-strength MPP bellows are combined together, and are not easy to fall off, so that the quick assembly and fixation of the light high-strength MPP bellows are completed by the cooperation of the straight pipe section 2 and the connector 3.
As a further improvement of the invention, the outer pipe body is made of a compression-resistant weather-resistant modified polypropylene material, and the compression-resistant weather-resistant modified polypropylene material comprises the following components in parts by weight:
72-95 parts of polypropylene, and the balance of the polypropylene,
12-26 parts of POE,
α-Al 2 O 3 9-15 parts of g-PMMA,
4-8 parts of modified sericite,
0.1 to 1 part of sodium stearate,
1-5 parts of exocarpium citri rubrum master batch;
the preparation method of the compression-resistant weather-resistant modified polypropylene material comprises the following steps:
s1, alpha-Al 2 O 3 Adding g-PMMA, modified sericite and sodium stearate into a mixing device for mixing to obtain a primary mixture, adding the primary mixture, polypropylene, POE and exocarpium Citri rubrum master batch into a high-speed mixer for stirring at 250-400rpm for 10-15min, and uniformly mixing to obtain an integral mixture;
s2, adding the whole mixture into a double-screw extruder for blending extrusion, and granulating to obtain the granular compression-resistant weather-resistant modified polypropylene material.
Further, the twin-screw extruder has a screw speed of 200-300rpm, a temperature of 170-180 ℃ in zone I, 180-195 ℃ in zone II, 195-210 ℃ in zone III, 195-210 ℃ in zone IV, and 200-210 ℃ in extrusion die.
Further, alpha-Al 2 O 3 -g-PMMA is surface grafted MMA polymerization modified nano alumina, and the preparation method comprises the following steps:
(1) The method comprises the steps of carrying out a first treatment on the surface of the alpha-Al 2 O 3 Adding the powder into absolute ethanol, adding silane coupling agent KH-550, ultrasonic dispersing for 10-20min, heating to 75-85deg.C, refluxing for 1-3 hr,centrifuging, washing and vacuum drying to obtain pretreated surface modified alpha-Al 2 O 3 A powder;
(2) Surface-modified alpha-Al obtained in the step (1) 2 O 3 Adding methyl methacrylate into the powder, performing ultrasonic dispersion for 10-20min, adding azodiisobutyronitrile, performing water bath reaction at 60-70 ℃ for 12-18h, heating to 100 ℃ for reaction for 1-3h, cooling to room temperature, performing suction filtration, and drying to obtain the surface grafted MMA polymerization modified alpha-Al 2 O 3 。
Further, the modified sericite is an antioxidant BHT intercalated modified sericite, and the preparation method comprises the following steps:
A. heating a high-temperature resistance furnace to 800-1000 ℃ at a speed of 8-15 ℃/min, then placing sericite, preserving heat for 1-2 hours, taking out, and naturally cooling to room temperature to obtain activated sericite;
B. adding activated sericite into 8-12mol/L nitric acid according to a solid-to-liquid ratio of 2-4%, heating to 80-90 ℃, acidizing for 2-4 hours, washing with deionized water, and suction filtering until filtrate is neutral to obtain acidified sericite;
C. adding acidified sericite into NaCl saturated solution according to solid-liquid ratio of 8-10%, heating to 90-95 ℃ for 1-3h, standing for 6-12h, and filtering to obtain nano-sized sericite;
D. dissolving an antioxidant BHT in an ethanol solution, adding the nano-modified sericite into the antioxidant BHT solution, heating to 90-95 ℃, performing ultrasonic treatment for 2-4 hours, washing, suction filtering and drying to obtain the BHT intercalation modified sericite.
As a further improvement of the invention, the inner pipe body is made of a high-toughness flame-retardant polyethylene-polypropylene composite material, and the high-toughness flame-retardant polyethylene-polypropylene composite material comprises the following raw materials in parts by weight:
40-55 parts of high-density polyethylene,
12-22 parts of ethylene propylene diene monomer rubber,
20-35 parts of polypropylene, and the total weight of the polypropylene,
3-5 parts of SEBS (styrene-ethylene-butylene-styrene),
nano CaCO 3 4-8 parts of a water-soluble polymer,
2-5 parts of composite intumescent flame retardant,
0.1 to 0.5 part of antioxidant,
0.2-2 parts of compatilizer,
1-5 parts of carbon black master batch;
the preparation method of the high-toughness flame-retardant polyethylene-polypropylene composite material comprises the following steps: SEBS and nano CaCO 3 Mixing the expansion flame retardant, the antioxidant and the compatilizer, adding the mixture into a double-screw extruder together with high-density polyethylene, ethylene propylene diene monomer, polypropylene and carbon black master batch particles for blending extrusion, and granulating to obtain the granular compression-resistant weather-resistant modified polypropylene material, wherein the rotation speed of a screw of the double-screw extruder is 250-350rpm, the temperature of a first zone is 160-180 ℃, the temperature of a second zone is 175-190 ℃, the temperature of a third zone is 190-205 ℃, the temperature of a fourth zone is 195-210 ℃, and the temperature of an extrusion die is 200-210 ℃.
Further, the composite intumescent flame retardant is prepared by mixing piperazine phosphate char forming agent and single-component intumescent flame retardant according to a mass ratio of 1:2-3, and the preparation method comprises the following steps:
a. adding amino trimethylene phosphoric acid and piperazine into deionized water according to a molar ratio of 1:1, stirring and reacting for 1-2h at 38-42 ℃, and washing and drying a product after reduced pressure distillation to obtain a piperazine phosphate carbonizing agent;
b. under the condition of magnetic stirring, dissolving sulfanilic acid in deionized water at 90-95 ℃, dripping aminoethylpiperazine into the sulfanilic acid solution at a constant titration rate, reacting for 2-4 hours under heat preservation, and obtaining piperazine sulfonate after reduced pressure distillation, suction filtration and drying;
c. adding ammonium polyphosphate into 70-80V/V% ethanol solution, stirring for 10-12h, adding piperazine sulfonate obtained in the step b into the solution, carrying out reflux reaction at 90-95 ℃ for 1-3h, and carrying out suction filtration, washing and drying to obtain a single-component intumescent flame retardant;
d. and d, mixing the piperazine phosphate char-forming agent obtained in the step a with the single-component intumescent flame retardant obtained in the step c in proportion to obtain the composite intumescent flame retardant.
Further, the antioxidant is one or a combination of more of hindered phenol stabilizers, phosphite stabilizers and thioester antioxidants;
the compatilizer is one or a combination of more of polypropylene grafted maleic anhydride, polypropylene grafted carboxylic acid, chlorinated polypropylene, polypropylene grafted glycidyl methacrylate, polyethylene grafted maleic anhydride and methacrylic acid-styrene-butadiene polymer.
Material preparation
The outer tube body and the inner tube body of the invention are respectively prepared by adopting the formulas in table 1 and table 2 and the preparation method, then the materials are added into a double-roller mixer for mixing for 20min at 180 ℃, the mixture is put into a flat vulcanizing machine for maintaining the pressure for 5min under the pressure of 10MPa, and the standard sheet with the thickness of 140mm multiplied by 100mm multiplied by 5mm is prepared after natural cooling:
performance detection
The test shapes of the composite conditions prepared by using the outer tube materials prepared in groups 1 to 4 and the inner tube sheets prepared in groups 5 to 8 and the standard PP as the test pieces of the control group were prepared for tensile strength test (according to GB/T1040-1992), notched impact strength test (according to GB/T1843-1996), bending property test (according to GB/T9341-2000) and combustion property test (GB 8624-2012) by using a universal sample machine, and the data are shown in Table 3 below.
As can be seen from the above Table 3, the light high-strength MPP corrugated pipe outer pipe body of the invention adopts the compression-resistant weather-resistant modified polypropylene material and is made of elastomer POE and alpha-Al 2 O 3 The g-PMMA, the modified sericite and the polypropylene are blended and modified, so that the ageing resistance, the compression resistance and the impact resistance of the outer pipe body are obviously improved; the invention has light weight and high strengthThe MPP corrugated pipe inner pipe body adopts a high-toughness flame-retardant polyethylene-polypropylene composite material, and is compounded with polypropylene by high-density polyethylene, and ethylene propylene diene monomer, SEBS and nano CaCO are added 3 And the composite intumescent flame retardant is blended and modified, so that the bending property and flame retardant property of the inner pipe body are obviously improved.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims.
Claims (8)
1. The light high-strength MPP corrugated pipe is characterized by comprising a corrugated pipe main body (1), wherein one end of the corrugated pipe main body (1) is provided with an axially extending straight pipe section (2), the other end of the corrugated pipe main body (1) is fixedly connected with a connector (3), and the straight pipe section (2) and the connector (3) are matched to complete rapid assembly and fixation of the light high-strength MPP corrugated pipe;
the corrugated pipe comprises a corrugated pipe body (1) and an inner pipe body (102), wherein the outer wall of the outer pipe body (101) is provided with corrugated annular protrusions (1011), the inner wall of the inner pipe body (102) is a smooth circular arc surface, and the outer pipe body (101) and the inner pipe body (102) are integrally formed through a corrugated pipe forming die after being extruded through a composite extrusion die head of an extruder;
the connector (3) comprises an annular seat (301), one end of the annular seat (301) is fixedly connected with a corrugated pipe main body (1), an annular mounting groove (302) extending radially outwards is formed in the middle of the annular seat (301), a plurality of sealing strips (303) which are arranged in an annular array along the circle center of the annular seat (301) are arranged in the annular mounting groove (302), the sealing strips (303) are cylindrical, one end of each sealing strip (303) close to the corrugated pipe main body (1) is fixedly connected with the inner wall of the annular seat (301), one end of each sealing strip (303) far away from the corrugated pipe main body (1) is fixedly connected with a limiting ring (304), the limiting ring (304) is connected with the annular seat (301) in a rotating mode, a worm wheel disc (305) is arranged on the upper side edge of the limiting ring (304), a worm (306) is horizontally arranged above the limiting ring (304), two ends of the worm (306) are matched with a driving box (307) in a rotating mode, the driving box (307) is fixedly arranged on the outer wall of the annular seat (301), one end of each driving box (307) penetrates through a driving corner (307), and one end of each driving corner (307) penetrates through the driving corner box (307);
the annular bulge (1011) is internally sheathed with a reinforcing rib (1012), the reinforcing rib (1012) is a metal ring, the reinforcing rib (102) is arranged in a corrugated pipe forming die in advance, and is integrally formed with the annular bulge (1011) during extrusion forming of the corrugated pipe.
2. The lightweight high-strength MPP bellows of claim 1, wherein the outer tube (101) is a compression-resistant weather-resistant modified polypropylene material comprising the following components in parts by weight:
72-95 parts of polypropylene, and the balance of the polypropylene,
12-26 parts of POE,
α-Al 2 O 3 9-15 parts of g-PMMA,
4-8 parts of modified sericite,
0.1 to 1 part of sodium stearate,
1-5 parts of exocarpium citri rubrum master batch;
the preparation method of the compression-resistant weather-resistant modified polypropylene material comprises the following steps:
s1, alpha-Al 2 O 3 Adding g-PMMA, modified sericite and sodium stearate into a mixing device for mixing to obtain a primary mixture, adding the primary mixture, polypropylene, POE and exocarpium Citri rubrum master batch into a high-speed mixer for stirring at 250-400rpm for 10-15min, and uniformly mixing to obtain an integral mixture;
s2, adding the whole mixture into a double-screw extruder for blending extrusion, and granulating to obtain the granular compression-resistant weather-resistant modified polypropylene material.
3. The lightweight high-strength MPP bellows according to claim 2, wherein the twin-screw extruder has a screw speed of 200-300rpm, a temperature in zone i of 170-180 ℃, a temperature in zone ii of 180-195 ℃, a temperature in zone iii of 195-210 ℃, a temperature in zone iv of 195-210 ℃, and a temperature in the extrusion die of 200-210 ℃.
4. The lightweight high-strength MPP bellows of claim 2, wherein said α -Al 2 O 3 -g-PMMA is surface grafted MMA polymerization modified nano alumina, and the preparation method comprises the following steps:
(1) The method comprises the steps of carrying out a first treatment on the surface of the alpha-Al 2 O 3 Adding the powder into absolute ethanol, adding silane coupling agent KH-550, performing ultrasonic dispersion for 10-20min, heating to 75-85deg.C, refluxing for 1-3 hr, centrifuging, washing, and vacuum drying to obtain pretreated surface modified alpha-Al 2 O 3 A powder;
(2) Surface-modified alpha-Al obtained in the step (1) 2 O 3 Adding methyl methacrylate into the powder, performing ultrasonic dispersion for 10-20min, adding azodiisobutyronitrile, performing water bath reaction at 60-70 ℃ for 12-18h, heating to 100 ℃ for reaction for 1-3h, cooling to room temperature, performing suction filtration, and drying to obtain the surface grafted MMA polymerization modified alpha-Al 2 O 3 。
5. The lightweight high-strength MPP bellows of claim 2, wherein the modified sericite is an antioxidant BHT intercalated modified sericite, and the preparation method comprises the following steps:
A. heating a high-temperature resistance furnace to 800-1000 ℃ at a speed of 8-15 ℃/min, then placing sericite, preserving heat for 1-2 hours, taking out, and naturally cooling to room temperature to obtain activated sericite;
B. adding activated sericite into 8-12mol/L nitric acid according to a solid-to-liquid ratio of 2-4%, heating to 80-90 ℃, acidizing for 2-4 hours, washing with deionized water, and suction filtering until filtrate is neutral to obtain acidified sericite;
C. adding acidified sericite into NaCl saturated solution according to solid-liquid ratio of 8-10%, heating to 90-95 ℃ for 1-3h, standing for 6-12h, and filtering to obtain nano-sized sericite;
D. dissolving an antioxidant BHT in an ethanol solution, adding nano-chemical sericite into the antioxidant BHT solution, heating to 90-95 ℃, performing ultrasonic treatment for 2-4 hours, washing, suction filtering and drying to obtain the BHT intercalation modified sericite.
6. The lightweight high-strength MPP bellows of claim 1, wherein the inner tube (102) is a high-toughness flame-retardant polyethylene-polypropylene composite material comprising the following raw materials in parts by weight:
40-55 parts of high-density polyethylene,
12-22 parts of ethylene propylene diene monomer rubber,
20-35 parts of polypropylene, and the total weight of the polypropylene,
3-5 parts of SEBS (styrene-ethylene-butylene-styrene),
nano CaCO 3 4-8 parts of a water-soluble polymer,
2-5 parts of composite intumescent flame retardant,
0.1 to 0.5 part of antioxidant,
0.2-2 parts of compatilizer,
1-5 parts of carbon black master batch;
preparation of the high-toughness flame-retardant polyethylene-polypropylene composite materialThe preparation method comprises the following steps: SEBS and nano CaCO 3 Mixing the expansion flame retardant, the antioxidant and the compatilizer, adding the mixture into a double-screw extruder together with high-density polyethylene, ethylene propylene diene monomer, polypropylene and carbon black master batch particles for blending extrusion, and granulating to obtain the granular compression-resistant weather-resistant modified polypropylene material, wherein the rotation speed of a screw of the double-screw extruder is 250-350rpm, the temperature of a first zone is 160-180 ℃, the temperature of a second zone is 175-190 ℃, the temperature of a third zone is 190-205 ℃, the temperature of a fourth zone is 195-210 ℃, and the temperature of an extrusion die is 200-210 ℃.
7. The lightweight high-strength MPP bellows of claim 6, wherein the composite intumescent flame retardant is mixed by piperazine phosphate char former and single component intumescent flame retardant in a mass ratio of 1:2-3, the preparation method comprising the steps of:
a. adding amino trimethylene phosphoric acid and piperazine into deionized water according to a molar ratio of 1:1, stirring and reacting for 1-2h at 38-42 ℃, and washing and drying a product after reduced pressure distillation to obtain the piperazine phosphate carbonizing agent;
b. under the condition of magnetic stirring, dissolving sulfanilic acid in deionized water at 90-95 ℃, dripping aminoethylpiperazine into the sulfanilic acid solution at a constant titration rate, reacting for 2-4 hours under heat preservation, and obtaining piperazine sulfonate after reduced pressure distillation, suction filtration and drying;
c. adding ammonium polyphosphate into 70-80V/V% ethanol solution, stirring for 10-12h, adding piperazine sulfonate obtained in the step b into the solution, carrying out reflux reaction at 90-95 ℃ for 1-3h, and carrying out suction filtration, washing and drying to obtain the single-component intumescent flame retardant;
d. and d, mixing the piperazine phosphate char-forming agent obtained in the step a with the single-component intumescent flame retardant obtained in the step c in proportion to obtain the composite intumescent flame retardant.
8. The lightweight high-strength MPP bellows of claim 6, wherein said antioxidant is one or a combination of more of hindered phenolic stabilizers, phosphite stabilizers, thio-ester antioxidants;
the compatilizer is one or a combination of more of polypropylene grafted maleic anhydride, polypropylene grafted carboxylic acid, chlorinated polypropylene, polypropylene grafted glycidyl methacrylate, polyethylene grafted maleic anhydride and methacrylic acid-styrene-butadiene polymer.
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