CN114619641B - Production process and sealing connection method of double-wall corrugated pipe - Google Patents
Production process and sealing connection method of double-wall corrugated pipe Download PDFInfo
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- CN114619641B CN114619641B CN202210234818.4A CN202210234818A CN114619641B CN 114619641 B CN114619641 B CN 114619641B CN 202210234818 A CN202210234818 A CN 202210234818A CN 114619641 B CN114619641 B CN 114619641B
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- 238000007789 sealing Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- 229920005989 resin Polymers 0.000 claims abstract description 21
- 239000011347 resin Substances 0.000 claims abstract description 21
- 229920001567 vinyl ester resin Polymers 0.000 claims abstract description 16
- 238000004132 cross linking Methods 0.000 claims abstract description 12
- 239000011248 coating agent Substances 0.000 claims abstract description 10
- 238000000576 coating method Methods 0.000 claims abstract description 10
- XDLMVUHYZWKMMD-UHFFFAOYSA-N 3-trimethoxysilylpropyl 2-methylprop-2-enoate Chemical compound CO[Si](OC)(OC)CCCOC(=O)C(C)=C XDLMVUHYZWKMMD-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- JHTCDEYHVGIPAL-UHFFFAOYSA-N tridodecoxy(ethenyl)silane Chemical compound CCCCCCCCCCCCO[Si](OCCCCCCCCCCCC)(OCCCCCCCCCCCC)C=C JHTCDEYHVGIPAL-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000004594 Masterbatch (MB) Substances 0.000 claims description 24
- 239000002994 raw material Substances 0.000 claims description 16
- 239000004698 Polyethylene Substances 0.000 claims description 15
- 229920000573 polyethylene Polymers 0.000 claims description 15
- -1 polyethylene Polymers 0.000 claims description 14
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 claims description 12
- 229920001971 elastomer Polymers 0.000 claims description 12
- 238000001125 extrusion Methods 0.000 claims description 11
- 230000003197 catalytic effect Effects 0.000 claims description 10
- 238000005520 cutting process Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 10
- 229920001903 high density polyethylene Polymers 0.000 claims description 9
- 239000004700 high-density polyethylene Substances 0.000 claims description 9
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 8
- 239000000314 lubricant Substances 0.000 claims description 8
- 239000012948 isocyanate Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 239000004342 Benzoyl peroxide Substances 0.000 claims description 4
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 claims description 4
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 claims description 4
- 235000019400 benzoyl peroxide Nutrition 0.000 claims description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 4
- 239000012975 dibutyltin dilaurate Substances 0.000 claims description 4
- 230000035484 reaction time Effects 0.000 claims description 4
- 239000012170 montan wax Substances 0.000 claims description 3
- 239000004209 oxidized polyethylene wax Substances 0.000 claims description 3
- 235000013873 oxidized polyethylene wax Nutrition 0.000 claims description 3
- 238000004513 sizing Methods 0.000 claims description 3
- 238000013329 compounding Methods 0.000 claims description 2
- 238000009966 trimming Methods 0.000 claims description 2
- 238000005304 joining Methods 0.000 claims 1
- 229920002521 macromolecule Polymers 0.000 abstract description 6
- 150000002978 peroxides Chemical class 0.000 abstract description 5
- 229910002808 Si–O–Si Inorganic materials 0.000 abstract description 2
- 230000000977 initiatory effect Effects 0.000 abstract description 2
- 238000006068 polycondensation reaction Methods 0.000 abstract description 2
- 229920000642 polymer Polymers 0.000 abstract description 2
- 230000007062 hydrolysis Effects 0.000 abstract 1
- 238000006460 hydrolysis reaction Methods 0.000 abstract 1
- 239000000047 product Substances 0.000 description 12
- 230000002706 hydrostatic effect Effects 0.000 description 6
- 238000000465 moulding Methods 0.000 description 5
- 239000000498 cooling water Substances 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- 150000003254 radicals Chemical class 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 229920000049 Carbon (fiber) Polymers 0.000 description 3
- 239000004917 carbon fiber Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 238000000071 blow moulding Methods 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000005469 granulation Methods 0.000 description 2
- 230000003179 granulation Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 238000007666 vacuum forming Methods 0.000 description 2
- 244000043261 Hevea brasiliensis Species 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 229920001194 natural rubber Polymers 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
- B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L51/06—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
- B29L2023/18—Pleated or corrugated hoses
-
- C—CHEMISTRY; METALLURGY
- 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
-
- 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
Abstract
The invention discloses a production process of a double-wall corrugated pipe and a sealing connection method thereof, which belong to the technical field of double-wall corrugated pipes, vinyl tri (dodecyloxy) silane and 3-methacryloxypropyl trimethoxy silane are utilized to promote polymer crosslinking, and Si-O-Si bonds are formed through hydrolysis polycondensation reaction, so that macromolecules are crosslinked into a reticular structure, vinyl ester resin is used for coating and sealing, and the double-wall corrugated pipe can be crosslinked under the initiation of heating and peroxide.
Description
Technical Field
The invention belongs to the technical field of double-wall corrugated pipes, and particularly relates to a production process of a double-wall corrugated pipe and a sealing connection method of the double-wall corrugated pipe.
Background
HDPE double-wall corrugated pipe has good prospect in China, and the dosage of municipal pipelines is greatly increased along with the acceleration of urban steps in China and the implementation of large-scale key projects in China. Plastic pipelines have many advantages over traditional metal pipelines and concrete pipelines, and are widely recognized by the engineering community. The governments in the country and at various levels are actively promoting plastic pipelines, and users of municipal and utility use plastic pipelines. Technology for connecting PE double-wall corrugated pipes is very important to improve the connection technology of the double-wall corrugated pipes, and is usually connected in a socket-and-spigot mode by using sealing rings. For example, CN215763822U socket double-wall corrugated pipes and the like, and the connection of the double-wall corrugated pipes mainly comprises several connection modes of flaring socket connection, half connection, sleeve connection and the like. The double-wall corrugated pipe annular structure has rigidity and flexibility, compression resistance, impact resistance and proper flexibility, can directly lay the pipe in a slightly bent groove without a pipe fitting, can conform to uneven settlement of a foundation, and can not generate the phenomena such as disconnection, fracture and the like of a concrete pipe. However, when the vertical pressure is large, such as the pressure of a heavy-duty vehicle directly borne by the corrugated pipe, the buried soil drag force of the corrugated pipe is rapidly increased along with the increase of the depth, the site construction is not standard, and when the stress is uneven, the local stress is very concentrated, and the corrugated pipe is easily broken and damaged or even leaked. The strength of the corrugated pipe is improved, deformation or breakage of the corrugated pipe can be avoided, and the sealing performance of the corrugated pipe is improved. Those skilled in the art are required to develop a production process of a double-wall corrugated pipe and a sealing connection method thereof to meet the existing application market and performance requirements.
Disclosure of Invention
In view of the above, the present invention provides a process for producing a double-wall corrugated pipe and a sealing connection method thereof.
The production process of the double-wall corrugated pipe comprises the following steps of:
(1) The method comprises the steps of (1) putting an outer layer raw material into an outer layer extruder hopper, and putting an inner layer raw material into an inner layer extruder hopper; (2) Setting process parameters of an inner layer extruder and an outer layer extruder, extruding materials through an outer layer runner of a co-extrusion die to form an outer layer, extruding the materials through an inner layer runner of the co-extrusion die to form an inner layer, compounding the outer layer and the inner layer at a discharge port of a mouth die of the co-extrusion die, and forming waves on the outer layer through a ripple forming module to obtain the double-wall ripple pipe; (3) Steam crosslinking, cooling, sizing, cutting at a fixed length, wherein the steam crosslinking reaction temperature is controlled to be 115-120 ℃ and the reaction time is 3-4 hours; and (4) flattening by the trimming machine to obtain the finished product.
Further, the raw materials comprise an inner layer and an outer layer, and the outer layer comprises the following raw materials in parts by weight: 100 parts of polyethylene grafted master batch, 1.5-2.0 parts of lubricant, 10-15 parts of catalytic master batch and 33-35 parts of calcium carbonate; the inner layer comprises the following raw materials: 100 parts of PPR resin grafting master batch, 16-18 parts of vinyl tri (dodecyloxy) silane and 0.15-0.2 part of dicumyl peroxide, wherein the polyethylene grafting master batch comprises 100 parts of HDPE, 1.5-2 parts of 3-methacryloxypropyl trimethoxy silane and 0.15-0.2 part of dicumyl peroxide; the catalytic masterbatch: 100 parts of HDPE, 0.2-0.25 part of dicumyl peroxide and 2-2.5 parts of dibutyl tin dilaurate; the lubricant is one or a mixture of more of oxidized polyethylene wax and montan wax.
Further, the process parameter of the outer layer extruder is the rotating speed of the host screw of 12-14 rpm, and the process parameter of the inner layer extruder is the rotating speed of the host screw of 8-10 rpm.
Further, the sealing connection method of the double-wall corrugated pipe produced by the production process of the double-wall corrugated pipe is characterized by comprising the following steps of: (1) Chamfering the connecting end by 15-20 degrees after cutting the double-wall corrugated pipe, wherein the thickness of the bevel end is 1/3-1/2 of that of the pipe wall, and cutting off the pipe to enable the cut to be flat and perpendicular to the pipe axis; (2) cleaning the scraps and marking out connected marked lines; (3) Wiping the working surface of the rubber ring and the socket end with rag; (4) Uniformly coating vinyl ester resin on the contact surface of the rubber ring and the sealing joint in the trough of the sealing corrugated pipe, wherein the vinyl ester resin is isocyanate modified vinyl ester resin containing 0.5-1wt% of benzoyl peroxide, and the coating amount is 220-230 g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the (5) Placing a clean rubber ring into the trough of the corrugated pipe to be sealed; (6) Aligning and sealing the connecting pipeline in a sealing connection mode, keeping the sealing connecting pipeline section straight, and pulling the pipe section to the marking line by using a pulling machine, wherein the sealing connection mode comprises one of socket connection, half connection or sleeve connection; and (7) baking the mixture for 20-30 min at 145-150 ℃ by a heating belt.
The technology process has the characteristics of simple equipment, low cost and simple process, utilizes vinyl tri (dodecyloxy) silane and 3-methacryloxypropyl trimethoxy silane to promote polymer crosslinking, a peroxide initiator is heated to decompose to generate active free radicals, the active free radicals of the peroxide attack polyethylene and polypropylene macromolecules to generate reactive free radicals, the reactive free radical macromolecules react with grafted 3-methacryloxypropyl trimethoxy silane and vinyl tri (dodecyloxy) silane to generate crosslinkable grafted macromolecules, silicon on the reactive grafted macromolecules is subjected to hydrolytic polycondensation reaction under the action of a catalyst and water to crosslink to form Si-O-Si bonds, so that the macromolecules are crosslinked into a network structure, and the network structure is formed rapidly by steam crosslinking. The vinyl ester resin is used for coating and sealing, and can be crosslinked under the initiation of heating and peroxide, and as the peroxide is also contained in the double-wall corrugated pipe, the sealing part of the double-wall corrugated pipe can disperse the direct load performance and impact energy and has good corrosion resistance, the vinyl ester resin can make up the condition of unevenness in actual construction, fill gaps and ensure the defect of water tightness, the carbon fiber heating belt has large baking operation space, and the isocyanate modified vinyl ester resin can adapt to the uneven sedimentation of soil and provide supplement for flexible sealing of the elastic sealing ring.
Compared with the prior art, the invention has the following advantages:
the production process method of the double-wall corrugated pipe and the sealing connection method thereof disclosed by the invention have the advantages that the grafting and crosslinking strength of the double-wall pipe wall is higher, the flexible connection of the natural rubber sealing ring and the vinyl resin coating are utilized, the installation is convenient, the connection is firm, the leakage is not easy, the external pressure resistance is strong, the outer wall is in an annular corrugated structure, the annular rigidity of the pipe is greatly enhanced, the resistance of the pipe to soil load is enhanced, the good impact resistance and chemical stability are realized, the good anti-corrosion sealing effect is realized at the sealing position, and the influence of uneven settlement on the ground to a certain extent is small.
Description of the embodiments
Example 1
Suzhou Jin Dali molding SBG-600, extrusion speed 1.4 m/min, shanghai platinum injection machine 100KG-10T horizontal mixer, preparation before start-up: oriplas Machinery SZYBW-600 double-wall corrugated pipe production line, inspecting electric elements of the whole production line, and starting a power supply. The method comprises the steps of setting production temperature, pressure and speed on a cabinet panel, selecting production flaring, starting heating, adopting outer wall vacuum forming, inner wall charging compressed air blow molding and sizing, namely external suction internal blowing, wherein the vacuum degree is controlled at-0.07 MPa, the compressed air pressure is 0.06MPa, and the extrusion speed is 1.2m/s, wherein the process parameters of the outer layer extruder, namely the No. 1 extruder, are that the screw temperature is 1 zone 185 ℃,2 zone 185 ℃,3 zone 190 ℃,4 zone 190 ℃, confluence core 170 ℃, die 1-3 zone 185 ℃,4-5 zone, 6-7 zone, die 215 ℃, host screw speed is 12 revolutions per minute, and tractor speed is 0.5 m/min; the inner layer extruder is 2# extruder, the screw temperature is 1 zone 180 ℃,2 zone 180 ℃,3 zone to 4 zone 190 ℃, confluence core 185 ℃, die 195 ℃ and the host screw rotating speed is 10 revolutions per minute.
Integrally mounting Jin Dali a molded SBG-600 head, centering the head and molding machine: after the machine head and the mould are replaced, the forming machine is opened to a production position, the upper and lower moulds are opened, gaps are adjusted by using a feeler gauge and a vernier caliper, wherein after each area of the machine head is heated for 2 hours, the No. 1 and No. 2 extruders are started to heat, and meanwhile, after cooling water of a feeding section is opened, production is carried out: step one, feeding: the method comprises the steps of adding materials into a hopper by a vacuum feeding machine, starting a dryer to dry the materials for 2 hours at the drying temperature of 60 ℃, starting a driving motor of an extruder to enable a screw to rotate at a low speed and then reach a preset rotating speed, opening a hopper plugboard, discharging by a standby head, extruding pipes, clicking a forward button of a forming machine to enable the forming machine to reach a preset position, starting a vacuum pump after the forming machine is adjusted in place, and opening a first section of vacuum. The molding machine is started to operate the module. Starting normal inflation, fast inflation, starting a No. 1 extruder, stopping fast inflation after a period of time, starting a No. 2 extruder after an outer layer wall is formed and primary vacuum is formed to form pressure, starting cooling after normal production of a pipe, starting a water pump motor, uniformly spraying cooling water on the pipe through a spray cooling groove to cool the pipe to room temperature, and forming waves on the outer layer through a wave forming module to obtain the double-wall corrugated pipe; after the cutting machine is started to cut, the reaction temperature of steam crosslinking and steam crosslinking is controlled to be 120 ℃, and the reaction time is 4 hours. Cooling to room temperature, and cutting and stacking by a stacking machine, wherein the raw materials comprise an inner layer and an outer layer, and the outer layer comprises the following raw materials in parts by weight: 100 parts of polyethylene grafted master batch, 2.0 parts of lubricant, 10-15 parts of catalytic master batch and 35 parts of Anhui Lida LD-800 calcium carbonate; the inner layer comprises the following raw materials: 100 parts of PPB-EN00-S Yangzi petrochemical PPR resin grafting master batch, 18 parts of vinyl tri (dodecyloxy) silane and 0.2 part of dicumyl peroxide, and polyethylene grafting master batch: 100 parts of HDPE, 2 parts of 3-methacryloxypropyl trimethoxy silane with the brand name of KH-570 and 0.2 part of dicumyl peroxide; the catalytic masterbatch: HDPE Yangzi petrochemical YEM-4903T100 parts, dicumyl peroxide 0.25 parts and dibutyl tin dilaurate 2.5 parts; the lubricant is oxidized polyethylene wax CRAYVALLAC P60P.
The production of the polyethylene grafting master batch and the catalytic master batch comprises the steps of fully and uniformly mixing the preparation materials by a horizontal mixer, and then adding the mixture into a co-rotating double-screw extruder for extrusion granulation. The temperature of the production process of the homodromous double-screw extruder with the rotating speed of 40r/min is controlled as follows: the first section of the machine barrel is at 160 ℃; the second section is 180 ℃; the three sections are 190 ℃; the four sections are 200 ℃, the temperature of the granulating mould is 190 ℃, and the extruder is SJ-90.
The obtained product: the tensile yield strength is 27.3MPa, GB/T1040.2-2006, 100mm/min of an injection molding type 1A sample is adopted for stretching, the nominal strain is 315%, the internal pressure resistance (80 ℃ C., the ring stress is 4.0MPa,165 h) is free from damage, the GB/T6111-2018 is free from leakage when the internal pressure resistance (80 ℃ C., the ring stress is 2.8MPa,1000 h) of an A type sealing joint is adopted.
The product meets DN500SN8 specification, and various performance detection results of the product with reference to GB/T19472.1-2019 are shown in table 1.
TABLE 1 results of various Performance tests of the product obtained in example 1 with reference to GB/T19472.1-2004
The connection is sealed by the following steps: the sealing connection mode is socket connection with a expansion port, (1) after the double-wall corrugated pipe is cut, chamfering 20 degrees is carried out on the connection end, the thickness of the bevel end is 1/3 of the pipe wall, and the pipe is cut off to enable the incision to be flat and perpendicular to the pipe axis; (2) cleaning the scraps and marking out connected marked lines; (3) Wiping the working surface of the rubber ring and the socket end with rag; (4) Uniformly coating vinyl ester resin on the contact surface of the rubber ring in the trough of the sealing corrugated pipe and the sealing joint, wherein the vinyl ester resin is isocyanate modified vinyl ester resin DSM580 containing 0.5wt% of benzoyl peroxide, and the coating amount is 220g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the (5) Placing a clean rubber ring into the trough of the corrugated pipe to be sealed; (6) And (7) aligning the connecting pipelines in a sealing connection mode, sealing and connecting the connecting pipelines, keeping the sealing connecting pipeline sections straight, mechanically pulling the pipe sections to marked lines by using pulling force, and baking the pipe sections for 30min at 150 ℃ by using a carbon fiber heating belt.
The obtained product has system adaptability, and the condition B is as follows: the internal hydrostatic pressure (15 min) is 0.005MPa, the internal hydrostatic pressure (15 min) is 0.05MPa, and the internal negative air pressure (15 min) -0.03MPa is not more than-0.027 MPa; the angle deviation of the condition C is 1.5 DEG, the internal hydrostatic pressure (15 min) at 23 ℃ is not leaked at 0.005MPa, the negative internal air pressure (15 min) is not leaked at 0.05MPa, and the temperature is not more than 0.03MPa and less than or equal to-0.027 MPa; the pull-resistant force of the connection joint is 6.7kN, and the elastic sealing ring accords with GBT21783 regulation.
Example 2
Preparation before starting up: oriplas Machinery SZYBW-600 double-wall corrugated pipe production line, inspecting electric appliances and electric appliance elements of the whole production line, and starting a power supply. The method comprises the steps of setting production temperature, pressure and speed on a cabinet panel, selecting production flaring, starting heating, adopting outer wall vacuum forming, inner wall charging compressed air blow molding, namely external suction internal blowing, controlling vacuum degree to be-0.08 MPa, controlling compressed air pressure to be 0.03Pa, and extrusion speed to be 1.2m/s, wherein the process parameters of the outer layer extruder, namely a No. 1 extruder, are that the screw temperature is 1 zone 180 ℃,2 zone 185 ℃,3 zone 190 ℃,4 zone 185 ℃, confluence core 1870 ℃, die 1-3 zone 185 ℃,4-5 zone, 6-7 zone, die 195-235 ℃, host screw speed is 12 revolutions per minute, and tractor speed is 0.5 m/minute; the inner layer extruder is 2# extruder, the screw temperature is 1 zone 180 ℃,2 zone 180 ℃,3 zone-4 zone 185 ℃, confluence core 190 ℃, die 215 ℃ and the host screw rotating speed is 10 revolutions per minute.
Integrally mounting Jin Dali a molded SBG-600 head, centering the head and molding machine: after the machine head and the mould are replaced, the forming machine is opened to a production position, the upper and lower moulds are opened, gaps are adjusted by using a feeler gauge and a vernier caliper, wherein after each area of the machine head is heated for 2 hours, the No. 1 and No. 2 extruders are started to heat, and meanwhile, after cooling water of a feeding section is opened, production is carried out: step one, feeding: the method comprises the steps of adding materials into a hopper by a vacuum feeding machine, starting a dryer to dry the materials for 1h at the drying temperature of 50 ℃, starting a driving motor of an extruder to enable a screw to rotate at a low speed and then reach a preset rotating speed, opening a hopper plugboard, discharging by a standby head, extruding pipes, clicking a forward button of a forming machine to enable the forming machine to reach a preset position, starting a vacuum pump after the forming machine is adjusted in place, and opening a first section of vacuum. The molding machine is started to operate the module. Starting normal inflation, fast inflation, starting a No. 1 extruder, stopping fast inflation after a period of time, starting a No. 2 extruder after an outer layer wall is formed and primary vacuum is formed to form pressure, starting cooling after normal production of a pipe, starting a water pump motor, uniformly spraying cooling water on the pipe through a spray cooling groove to cool the pipe to room temperature, and forming waves on the outer layer through a wave forming module to obtain the double-wall corrugated pipe; starting the cutting machine to cut, steam crosslinking, cooling, cutting and stacking by the stacking machine to obtain the product,
the steam crosslinking reaction temperature is controlled to be 115 ℃ and the reaction time is 3 hours.
The raw materials comprise an inner layer and an outer layer, wherein the outer layer comprises the following raw materials in parts by weight: 100 parts of polyethylene grafted master batch, 1.5 parts of lubricant, 10 parts of catalytic master batch and 33 parts of GY-516 calcium carbonate; the inner layer comprises the following raw materials: 100 parts of PPB-EN00-S Yangzi petrochemical PPR resin grafting master batch, 16 parts of vinyl tri (dodecyloxy) silane and 0.15 part of dicumyl peroxide, and polyethylene grafting master batch: 100 parts of HDPE, 1.5 parts of 3-methacryloxypropyl trimethoxysilane with the name of KH-570 and 0.15 part of dicumyl peroxide; the catalytic masterbatch: HDPE Yangzi petrochemical YEM-4903T100 parts, dicumyl peroxide 0.25 parts and dibutyl tin dilaurate 2 parts; the lubricant is montan wax Licowax E/OP/WE40.
The production of the polyethylene grafting master batch and the catalytic master batch comprises the steps of fully and uniformly mixing the preparation materials by a horizontal mixer, adding the mixture into a homodromous double-screw extruder for extrusion granulation, and controlling the production process temperature when the screw speed is 30-40r/min by the homodromous double-screw extruder: the first section of the machine barrel is at 160 ℃; the second section is 180 ℃; the three sections are 195 ℃; the four sections are 200 ℃ and the temperature of the granulating mould is 190 ℃.
Wherein, the tensile yield strength of the product is 26.9MPa, GB/T1040.2-2006, 100mm/min of an injection molding 1A type sample is adopted for stretching, the nominal strain is 305%, the internal pressure resistance (80 ℃ C., ring stress is 4.0MPa,165 h) is not damaged, GB/T6111-2018, and the internal pressure resistance (80 ℃ C., ring stress is 2.8MPa,1000 h) of an A type sealing joint is adopted, so that no leakage exists.
The product accords with DN300SN8, and the detection results of various performances of the product with reference to GB/T19472.1-2004 are shown in table 2
TABLE 2 results of performance tests for the products obtained in example 2 with reference to GB/T19472.1-2019
The connection is sealed by the following steps: the sealing connection mode is sleeve connection, (1) after the double-wall corrugated pipe is cut, chamfering 15 degrees is carried out on the connection end, the thickness of the groove end is 1/2 of the pipe wall, and the pipe is cut off to enable the cut to be flat and perpendicular to the pipe axis; (2) cleaning the scraps and marking out connected marked lines; (3) Wiping the working surface of the rubber ring and the socket end with rag; (4) Uniformly coating vinyl ester resin on the contact surface of the rubber ring in the trough of the sealing corrugated pipe and the sealing joint, wherein the vinyl ester resin is isocyanate modified vinyl ester resin DSM580 containing 1wt% of benzoyl peroxide, and the coating amount is 230g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the (5) Placing a clean rubber ring into the trough of the corrugated pipe to be sealed; (6) Aligning and sealing the connecting pipeline in a sealing connection mode, keeping the sealing connecting pipeline section straight, and pulling the pipe section to the marking line by using a pulling machine; and (7) baking the carbon fiber heating belt for 30min at 150 ℃.
The obtained product has system adaptability, and the condition B is as follows: the internal hydrostatic pressure (15 min) is 0.005MPa, the internal hydrostatic pressure (15 min) is 0.05MPa, and the internal negative air pressure (15 min) -0.03MPa is not more than-0.027 MPa; the angle deviation of the condition C is 1.5 DEG, the internal hydrostatic pressure (15 min) at 23 ℃ is not leaked at 0.005MPa, the negative internal air pressure (15 min) is not leaked at 0.05MPa, and the temperature is not more than 0.03MPa and less than or equal to-0.027 MPa; the pulling resistance of the connection joint is 6.1kN, and the elastic sealing ring accords with GBT21783 regulation.
And (3) injection: refer to GB/T19472.1-2019 section 1 of a Polyethylene (PE) structural wall tubing system: polyethylene double-wall corrugated pipe.
Claims (3)
1. The production process of the double-wall corrugated pipe is characterized by comprising the following steps of:
(1) The raw materials comprise an inner layer and an outer layer, wherein the outer layer comprises the following raw materials in parts by weight: 100 parts of polyethylene grafted master batch, 1.5-2.0 parts of lubricant, 10-15 parts of catalytic master batch and 33-35 parts of calcium carbonate; the inner layer comprises the following raw materials: 100 parts of PPR resin grafting master batch, 16-18 parts of vinyl tri (dodecyloxy) silane and 0.15-0.2 part of dicumyl peroxide, wherein the polyethylene grafting master batch comprises 100 parts of HDPE, 1.5-2 parts of 3-methacryloxypropyl trimethoxy silane and 0.15-0.2 part of dicumyl peroxide; the catalytic master batch comprises 100 parts of HDPE, 0.2-0.25 part of dicumyl peroxide and 2-2.5 parts of dibutyltin dilaurate; the lubricant is one of oxidized polyethylene wax and montan wax, an outer layer raw material is put into an outer layer extruder hopper, and an inner layer raw material is put into an inner layer extruder hopper; (2) Setting process parameters of an inner layer extruder and an outer layer extruder, extruding materials through an outer layer runner of a co-extrusion die to form an outer layer, extruding the materials through an inner layer runner of the co-extrusion die to form an inner layer, compounding the outer layer and the inner layer at a discharge port of a mouth die of the co-extrusion die, and forming waves on the outer layer through a ripple forming module to obtain the double-wall ripple pipe; (3) Steam crosslinking, cooling, sizing, cutting at a fixed length, wherein the steam crosslinking reaction temperature is controlled to be 115-120 ℃ and the reaction time is 3-4 hours; and (4) flattening by the trimming machine to obtain the finished product.
2. The process for producing the double-wall corrugated pipe according to claim 1, wherein the process parameter of the outer-layer extruder is the rotation speed of a host screw of 12-14 rpm, and the process parameter of the inner-layer extruder is the rotation speed of the host screw of 8-10 rpm.
3. A method of sealing and joining a double-wall corrugated pipe produced by a process for producing a double-wall corrugated pipe as claimed in claim 1, comprising the steps of: (1) Chamfering the connecting end by 15-20 degrees after cutting the double-wall corrugated pipe, wherein the thickness of the bevel end is 1/3-1/2 of that of the pipe wall, and cutting off the pipe to enable the cut to be flat and perpendicular to the pipe axis; (2) cleaning the scraps and marking out connected marked lines; (3) Wiping the working surface of the rubber ring and the socket end with rag; (4) Uniformly coating vinyl ester resin on the contact surface of the rubber ring in the trough of the sealing corrugated pipe and the sealing joint, wherein the vinyl ester resin is isocyanate modified vinyl ester resin containing 0.5-1wt% of benzoyl peroxide; (5) Placing a clean rubber ring into the trough of the corrugated pipe to be sealed; (6) Aligning and sealing the connecting pipeline in a sealing connection mode, keeping the sealing connecting pipeline section straight, and pulling the pipe section to the marking line by using a pulling machine, wherein the sealing connection mode comprises one of socket connection, half connection or sleeve connection; and (7) baking the mixture for 20-30 min at 145-150 ℃ by a heating belt.
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Denomination of invention: The production process and sealing connection method of a double wall corrugated pipe Granted publication date: 20230728 Pledgee: Huishang Bank Co.,Ltd. Bengbu Wuhe sub branch Pledgor: ANHUI HAIDONG ENVIRONMENTAL PROTECTION TECHNOLOGY Co.,Ltd. Registration number: Y2024980007193 |