CN113402832B - Laying pipe and preparation process thereof - Google Patents
Laying pipe and preparation process thereof Download PDFInfo
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- CN113402832B CN113402832B CN202110807863.XA CN202110807863A CN113402832B CN 113402832 B CN113402832 B CN 113402832B CN 202110807863 A CN202110807863 A CN 202110807863A CN 113402832 B CN113402832 B CN 113402832B
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- modified polypropylene
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- laying pipe
- steel wires
- pipe
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- 238000002360 preparation method Methods 0.000 title abstract description 12
- -1 polypropylene Polymers 0.000 claims abstract description 60
- 239000000463 material Substances 0.000 claims abstract description 49
- 239000004743 Polypropylene Substances 0.000 claims abstract description 47
- 229920001155 polypropylene Polymers 0.000 claims abstract description 47
- 239000002245 particle Substances 0.000 claims abstract description 46
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 40
- 239000010959 steel Substances 0.000 claims abstract description 40
- 238000004513 sizing Methods 0.000 claims abstract description 31
- 239000002131 composite material Substances 0.000 claims abstract description 25
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000000178 monomer Substances 0.000 claims abstract description 18
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 14
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 14
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 14
- 239000002667 nucleating agent Substances 0.000 claims abstract description 14
- 229920005549 butyl rubber Polymers 0.000 claims abstract description 13
- 239000000843 powder Substances 0.000 claims abstract description 13
- OSDWBNJEKMUWAV-UHFFFAOYSA-N Allyl chloride Chemical compound ClCC=C OSDWBNJEKMUWAV-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000004698 Polyethylene Substances 0.000 claims abstract description 12
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims abstract description 12
- 229920000573 polyethylene Polymers 0.000 claims abstract description 12
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 12
- 238000005266 casting Methods 0.000 claims abstract description 9
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 claims abstract description 3
- NLKNQRATVPKPDG-UHFFFAOYSA-M potassium iodide Chemical compound [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 claims description 33
- 238000003756 stirring Methods 0.000 claims description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 22
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 20
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 claims description 19
- 238000005406 washing Methods 0.000 claims description 16
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 15
- 239000011347 resin Substances 0.000 claims description 14
- 229920005989 resin Polymers 0.000 claims description 14
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 12
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 12
- 239000008399 tap water Substances 0.000 claims description 11
- 235000020679 tap water Nutrition 0.000 claims description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 239000004014 plasticizer Substances 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 9
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 6
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 6
- 238000007605 air drying Methods 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 238000009966 trimming Methods 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 5
- 239000003513 alkali Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 239000012074 organic phase Substances 0.000 claims 1
- 229910052751 metal Inorganic materials 0.000 abstract description 15
- 239000002184 metal Substances 0.000 abstract description 15
- 239000004033 plastic Substances 0.000 abstract description 10
- 229920003023 plastic Polymers 0.000 abstract description 10
- 125000002467 phosphate group Chemical group [H]OP(=O)(O[H])O[*] 0.000 abstract description 8
- 229920000642 polymer Polymers 0.000 abstract description 7
- 229910019142 PO4 Inorganic materials 0.000 abstract description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 abstract description 3
- 239000010452 phosphate Substances 0.000 abstract description 3
- 230000000052 comparative effect Effects 0.000 description 21
- 239000012295 chemical reaction liquid Substances 0.000 description 12
- 239000002585 base Substances 0.000 description 11
- 239000000203 mixture Substances 0.000 description 8
- 239000007791 liquid phase Substances 0.000 description 7
- 238000011049 filling Methods 0.000 description 5
- 239000004568 cement Substances 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 4
- 238000002791 soaking Methods 0.000 description 4
- 239000002253 acid Substances 0.000 description 3
- 239000002518 antifoaming agent Substances 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 229920001971 elastomer Polymers 0.000 description 3
- 239000002352 surface water Substances 0.000 description 3
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical group C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000009920 chelation Effects 0.000 description 1
- 238000012669 compression test Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L43/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing boron, silicon, phosphorus, selenium, tellurium or a metal; Compositions of derivatives of such polymers
- C08L43/02—Homopolymers or copolymers of monomers containing phosphorus
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D23/00—Producing tubular articles
- B29D23/001—Pipes; Pipe joints
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F130/00—Homopolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing phosphorus, selenium, tellurium or a metal
- C08F130/02—Homopolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing phosphorus, selenium, tellurium or a metal containing phosphorus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/12—Rigid pipes of plastics with or without reinforcement
-
- 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
Abstract
The invention relates to a laying pipe and a preparation process thereof, belonging to the technical field of special pipe production, wherein the pipe is prepared by casting a mesh cage and a composite sizing material, and the composite sizing material comprises the following raw materials in parts by weight: 65-80 parts of modified polypropylene particles, 45-60 parts of polyethylene particles, 12-20 parts of butyl rubber powder, 1.8-2.1 parts of antioxidant, 0.4-0.6 part of nucleating agent and 3.5-5 parts of flatting agent; the modified polypropylene particles firstly generate a polymerization monomer containing double bonds and phosphate groups by allyl chloride and phosphoric acid, then are catalyzed and polymerized to form a polymer, the phosphate groups on the side chains of the polymer react with metal to form a phosphate complex, the polymer is firmly connected to a metal base material in a covalent bond form, the bonding force between a sizing material layer and the metal base material is greatly improved, the problem that the steel-plastic composite pipe is easy to peel off is solved, and meanwhile, steel wires are used as the framework of the pipe in a mesh cage form to endow the pipe with excellent pressure resistance.
Description
Technical Field
The invention belongs to the technical field of special pipe production, and particularly relates to a laying pipe and a preparation process thereof.
Background
In industrial and civil engineering, various fluids or gases are mostly conveyed by adopting pipelines, so that various pipes exist in the prior art, plastic pipes are favored because of good impermeability, corrosion resistance and easy forming, are commonly used for conveying acid, alkali, steam and the like, cement pipes are high in pressure-bearing capacity, long in service life and low in price, and are commonly used for water supply and drainage engineering construction.
In the prior art, a steel-plastic composite pipe is also provided, the pipe is made of a steel plate into a base pipe, and a plastic sizing material is sprayed on the surface of the base pipe, but the bonding strength of the plastic sizing material and the steel plate is not high, the plastic layer and the steel plate layer are easy to peel off under the repeated compression working condition, and the service life is not long.
Disclosure of Invention
In order to overcome the technical problems mentioned in the technical background, the invention aims to provide a laying pipe and a preparation process thereof.
The purpose of the invention can be realized by the following technical scheme:
the laying pipe is prepared by casting a cylinder mould and a composite sizing material, wherein the composite sizing material comprises the following raw materials in parts by weight:
65-80 parts of modified polypropylene particles, 45-60 parts of polyethylene particles, 12-20 parts of butyl rubber powder, 1.8-2.1 parts of antioxidant, 0.4-0.6 part of nucleating agent and 3.5-5 parts of flatting agent;
the modified polypropylene particles are prepared by the following steps:
step A1: mixing allyl chloride and phosphoric acid, adding the mixture into a reactor, adding absolute ethyl alcohol and potassium iodide into the reactor, discharging air in the reactor by using nitrogen, heating the mixture in a water bath at 32-37 ℃, controlling the stirring speed to be 180-one (r/min), reacting for 3-5h, introducing ammonia into the reaction liquid until the pH of the reaction liquid is 6-7, standing for liquid separation, taking a lower-layer liquid phase, stirring for 5-8h at room temperature, and volatilizing the absolute ethyl alcohol in the reaction liquid to obtain a polymeric monomer;
the specific reaction process is as follows:
step A2: adding a polymerization monomer and acetone into a reactor, adding azodiisobutyronitrile, sealing the reactor, controlling the stirring speed to be 200-250r/min at room temperature, reacting for 2-3h, then reducing the stirring speed to be 40-60r/min under the condition of ventilation of the reactor, and continuously stirring for 8-10h to obtain the modified polypropylene resin;
the specific reaction process is as follows:
step A3: adding the modified polypropylene resin and the plasticizer DOP into open plasticating equipment, controlling the plasticating temperature at 160-180 ℃, plasticating for 2-3h, and then extruding and granulating to prepare modified polypropylene particles.
Further, in step a1, allyl chloride, phosphoric acid, absolute ethanol, and potassium iodide are used in a ratio of 1 mol: 1.1-1.3 mol: 8-12 mL: 1.3-1.7 g.
Further, in step a2, the ratio of the amount of the polymerization monomers, acetone and azobisisobutyronitrile used is 15 mL: 20mL of: 0.4-0.6 g.
Further, in the step A3, the modified polypropylene particles and the plasticizer DOP are used in a mass ratio of 100:1.2-1.5, and the modified polypropylene resin is filtered by a 50-mesh screen before use.
Further, the antioxidant is bisphenol A.
Further, the nucleating agent is a nucleating agent DX-Z3C.
Further, the leveling agent is a leveling agent BYK-358N.
A preparation process of a laying pipe comprises the following steps:
preparing a mesh cage: adopting steel wires to form a net cage, setting the density of the steel wires of the inner ring to be 1.8-2.2 cm/piece, the density of the steel wires of the outer ring to be 3.5-4 cm/piece, welding and connecting the steel wires of the inner ring and the outer ring through the steel wires, and setting the density of the steel wires to be 10-12 cm/piece;
and (3) cylinder mould treatment: placing the net cage in sodium carbonate solution, cleaning at 40-50 deg.C for 10-15min, washing the net cage with tap water for 1-2 times, soaking the net cage in dilute sulfuric acid for 8-10min, washing with tap water for 1-2 times, and air drying;
preparing a composite sizing material: according to the weight part modification, adding polypropylene particles, polyethylene particles, butyl rubber powder and an antioxidant into an internal mixer, controlling the temperature at 190-;
and (3) casting molding: preheating the mould to 80-100 ℃, placing the mesh cage into the mould for positioning, extruding the composite sizing material into the mould, cooling for forming, and trimming to obtain the laying pipe.
The invention has the beneficial effects that:
the invention prepares a modified polypropylene particle in the process of preparing a laying pipe, which takes allyl chloride and phosphoric acid as raw materials, generates substitution reaction under the catalysis of potassium iodide to generate a polymeric monomer containing double bonds and phosphate groups, generates polyaddition reaction under the catalysis of azodiisobutyronitrile by the polymeric monomer to generate polypropylene resin with side chains containing phosphate groups, and finally plastifies and granulates the resin, the phosphorus hydroxyl on the phosphate groups on the side chains of the modified polypropylene particle has stronger chelation with the metal surface, can react with polyvalent metals to form phosphate complexes, further forms a layer of compact phosphating film, firstly firmly connects the polymer to the metal base material in a covalent bond form to form a bridge between the polymer and the metal base material, thereby improving the bonding force of sizing materials and metals, solving the problem of peeling of sizing material layers, and secondly, the compact phosphating film can passivate the surface of the metal base material to prevent the surface from rusting, greatly prolonging the service life of the pipe.
The laying pipe provided by the invention is prepared by casting the mesh cage and the composite sizing material, the steel wire mesh cage is used as a framework, the supporting and restoring effects are realized when the steel wire mesh cage is stressed, the good compression resistance and tensile resistance are realized, the mesh cage is subjected to alkali washing and acid washing treatment, surface impurities are removed, phosphate groups can better react with a metal base material to obtain chemical bonds, on the other hand, the surface of the steel wire is roughened, the bonding sites of the sizing material and the steel wire are increased, the bonding force is further improved, and the impermeability of the sizing material is further improved by filling butyl rubber powder added in the raw material of the composite sizing material in the sizing material.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the examples:
the antioxidant adopts bisphenol A.
The nucleating agent adopts a nucleating agent DX-Z3C.
And the leveling agent is a leveling agent BYK-358N.
The mass fraction of the sodium carbonate solution is 5%.
The mass fraction of the dilute sulfuric acid is 8 percent.
Example 1
In this example, a modified polypropylene particle is prepared by the following specific steps:
step A1: mixing allyl chloride and phosphoric acid, adding the mixture into a reactor, adding absolute ethyl alcohol and potassium iodide into the reactor, filling nitrogen into the reactor to discharge air in the reactor, heating the mixture in a water bath at 32 ℃, controlling the stirring speed to be 180r/min, reacting for 3 hours, then introducing ammonia gas into the reaction liquid until the pH of the reaction liquid is 6, standing and separating the liquid, taking the lower layer liquid phase, stirring the lower layer liquid phase for 5 hours at room temperature, volatilizing the absolute ethyl alcohol in the reaction liquid to prepare a polymeric monomer, wherein the dosage ratio of the allyl chloride, the phosphoric acid, the absolute ethyl alcohol and the potassium iodide is 1 mol: 1.1 mol: 8mL of: 1.3 g;
step A2: adding a polymerization monomer and acetone into a reactor, adding azobisisobutyronitrile, sealing the reactor, controlling the stirring speed at 200r/min at room temperature, reacting for 2 hours, then reducing the stirring speed at 40r/min under the condition of introducing air into the reactor, and continuously stirring for 8 hours to obtain the modified polypropylene resin, wherein the dosage ratio of the polymerization monomer to the acetone to the azobisisobutyronitrile is 15 mL: 20mL of: 0.4 g;
step A3: adding the modified polypropylene resin and the plasticizer DOP into open plastic equipment, controlling the plastication temperature at 160 ℃, plasticating for 2h, then extruding and granulating to prepare modified polypropylene particles, wherein the mass ratio of the modified polypropylene particles to the plasticizer DOP is 100:1.2, and the modified polypropylene particles are filtered by a 50-mesh screen before use.
Example 2
In this example, a modified polypropylene particle is prepared by the following specific steps:
step A1: mixing allyl chloride and phosphoric acid, adding the mixture into a reactor, adding absolute ethyl alcohol and potassium iodide into the reactor, filling nitrogen into the reactor to discharge air in the reactor, heating the mixture in a water bath at 35 ℃, controlling the stirring speed to be 200r/min, reacting for 4 hours, then introducing ammonia gas into the reaction liquid until the pH value of the reaction liquid is 7, standing and separating the liquid, taking the lower layer liquid phase, stirring the lower layer liquid phase for 7 hours at room temperature, volatilizing the absolute ethyl alcohol in the reaction liquid to prepare a polymeric monomer, wherein the dosage ratio of the allyl chloride, the phosphoric acid, the absolute ethyl alcohol and the potassium iodide is 1 mol: 1.2 mol: 10mL of: 1.5 g;
step A2: adding a polymerization monomer and acetone into a reactor, adding azobisisobutyronitrile, sealing the reactor, controlling the stirring speed at 200r/min at room temperature, reacting for 2 hours, then reducing the stirring speed at 50r/min under the condition of introducing air into the reactor, and continuously stirring for 9 hours to obtain the modified polypropylene resin, wherein the dosage ratio of the polymerization monomer to the acetone to the azobisisobutyronitrile is 15 mL: 20mL of: 0.5 g;
step A3: adding the modified polypropylene resin and the plasticizer DOP into open plastic equipment, controlling the plastication temperature at 170 ℃, plasticating for 2h, then extruding and granulating to prepare modified polypropylene particles, wherein the mass ratio of the modified polypropylene particles to the plasticizer DOP is 100:1.4, and the modified polypropylene particles are filtered by a 50-mesh screen before use.
Example 3
In this example, a modified polypropylene particle is prepared by the following specific steps:
step A1: mixing allyl chloride and phosphoric acid, adding the mixture into a reactor, adding absolute ethyl alcohol and potassium iodide into the reactor, filling nitrogen into the reactor to discharge air in the reactor, heating the mixture in a water bath at 37 ℃, controlling the stirring speed to be 240r/min, reacting for 5 hours, introducing ammonia gas into the reaction liquid until the pH of the reaction liquid is 7, standing and separating the liquid, taking the lower layer liquid phase, stirring the lower layer liquid phase for 8 hours at room temperature, volatilizing the absolute ethyl alcohol in the reaction liquid to prepare a polymeric monomer, wherein the dosage ratio of the allyl chloride, the phosphoric acid, the absolute ethyl alcohol and the potassium iodide is 1 mol: 1.3 mol: 12mL of: 1.7 g;
step A2: adding a polymerization monomer and acetone into a reactor, adding azobisisobutyronitrile, sealing the reactor, controlling the stirring speed to be 250r/min at room temperature, reacting for 3 hours, then reducing the stirring speed to be 60r/min under the condition of introducing air into the reactor, and continuously stirring for 10 hours to obtain the modified polypropylene resin, wherein the dosage ratio of the polymerization monomer to the acetone to the azobisisobutyronitrile is 15 mL: 20mL of: 0.6 g;
step A3: adding the modified polypropylene resin and the plasticizer DOP into open plastic equipment, controlling the plastication temperature at 180 ℃, plasticating for 3h, then extruding and granulating to prepare modified polypropylene particles, wherein the mass ratio of the modified polypropylene particles to the plasticizer DOP is 100:1.5, and the modified polypropylene particles are filtered by a 50-mesh screen before use.
Example 4
The preparation method of the laying pipe comprises the following raw materials in parts by weight:
65 parts of modified polypropylene particles, 45 parts of polyethylene particles prepared in example 1, 12 parts of butyl rubber powder, 1.8 parts of antioxidant, 0.4 part of nucleating agent and 3.5 parts of leveling agent;
the preparation process comprises the following steps:
preparing a mesh cage: adopting steel wires to form a net cage, setting the density of the steel wires of the inner ring to be 1.8 cm/piece, setting the density of the steel wires of the outer ring to be 3.5 cm/piece, welding and connecting the steel wires of the inner ring and the outer ring through the steel wires, and setting the density of the steel wires to be 10 cm/piece;
and (3) cylinder mould treatment: placing the net cage in sodium carbonate solution, cleaning at 40 deg.C for 10min, washing the net cage with tap water for 1 time, soaking the net cage in dilute sulfuric acid for 8min, washing with tap water for 1 time, and air drying;
preparing a composite sizing material: adding the modified polypropylene particles, the polyethylene particles, the butyl rubber powder and the antioxidant in parts by weight into an internal mixer, controlling the temperature at 190 ℃ and carrying out internal mixing treatment at the stirring speed of 200r/min for 30min, then adding the nucleating agent, the defoaming agent and the leveling agent into the internal mixer, stirring for 10min, extruding the mixed material by a screw extruder, and setting the discharging temperature at 140 ℃ to prepare a composite rubber material;
and (3) casting molding: preheating the mould to 80 ℃, placing the mesh cage into the mould for positioning, extruding the composite sizing material into the mould, cooling for forming, and trimming to obtain the laying pipe.
Example 5
The preparation method of the laying pipe comprises the following raw materials in parts by weight:
70 parts of modified polypropylene particles, 50 parts of polyethylene particles prepared in example 2, 15 parts of butyl rubber powder, 2 parts of antioxidant, 0.5 part of nucleating agent and 4 parts of leveling agent;
the preparation process comprises the following steps:
preparing a mesh cage: adopting steel wires to form a net cage, setting the density of the steel wires of the inner ring to be 2 cm/piece, setting the density of the steel wires of the outer ring to be 3.8 cm/piece, welding and connecting the steel wires of the inner ring and the outer ring through the steel wires, and setting the density of the steel wires to be 11 cm/piece;
and (3) cylinder mould treatment: placing the net cage in sodium carbonate solution, cleaning at 45 deg.C for 12min, washing with tap water for 2 times, soaking in dilute sulfuric acid for 9min, washing with tap water for 2 times, and air drying;
preparing a composite sizing material: adding the modified polypropylene particles, the polyethylene particles, the butyl rubber powder and the antioxidant in parts by weight into an internal mixer, controlling the temperature to be 200 ℃, carrying out internal mixing treatment at the stirring speed of 200r/min for 25min, then adding the nucleating agent, the defoaming agent and the leveling agent into the internal mixer, stirring for 8min, extruding the mixed material by a screw extruder, and setting the discharging temperature to be 145 ℃ to prepare a composite rubber material;
and (3) casting molding: preheating the mould to 90 ℃, placing the mesh cage into the mould for positioning, extruding the composite sizing material into the mould, cooling for forming, and trimming to obtain the laying pipe.
Example 6
The preparation method of the laying pipe comprises the following raw materials in parts by weight:
80 parts of modified polypropylene particles, 60 parts of polyethylene particles prepared in example 3, 20 parts of butyl rubber powder, 2.1 parts of antioxidant, 0.6 part of nucleating agent and 5 parts of leveling agent;
the preparation process comprises the following steps:
preparing a mesh cage: adopting steel wires to form a net cage, setting the density of the steel wires of the inner ring to be 2.2 cm/piece, setting the density of the steel wires of the outer ring to be 4 cm/piece, welding and connecting the steel wires of the inner ring and the outer ring through the steel wires, and setting the density of the steel wires to be 12 cm/piece;
and (3) cylinder mould treatment: placing the net cage in sodium carbonate solution, cleaning at 50 deg.C for 15min, washing the net cage with tap water for 2 times, soaking the net cage in dilute sulfuric acid for 10min, washing with tap water for 2 times, and air drying;
preparing a composite sizing material: adding the modified polypropylene particles, the polyethylene particles, the butyl rubber powder and the antioxidant in parts by weight into an internal mixer, controlling the temperature at 210 ℃, carrying out internal mixing treatment at the stirring speed of 300r/min for 20min, then adding the nucleating agent, the defoaming agent and the leveling agent into the internal mixer, stirring for 5min, extruding the mixed material by a screw extruder, and setting the discharge temperature at 150 ℃ to prepare a composite rubber material;
and (3) casting molding: preheating a mould to 100 ℃, placing the mesh cage into the mould for positioning, extruding the composite sizing material into the mould, cooling for forming, and trimming to obtain the laying pipe.
Comparative example 1
This comparative example is a commercial PVC pipe.
Comparative example 2
The comparative example is a commercial cement pipe.
Comparative example 3
This comparative example is a commercially available steel-plastic composite pipe.
The samples prepared in examples 4-6 and comparative examples 1-3 were tested for their properties, as follows:
examples 4 to 6, comparative example 1 and comparative example 3 were subjected to an internal pressure resistance test in accordance with GB/T6111-:
TABLE 1
As can be seen from Table 1, the pipes prepared in examples 4-6 have excellent internal pressure resistance, wherein example 5 reaches 15.5MPa, and can be used for high-pressure medium transportation.
Taking examples 4-6 and comparative example 2, filling tap water of 3MPa into the interior after end capping, observing the surface water seepage condition, recording the surface water seepage days, and the specific data are shown in Table 2:
TABLE 2
| 20d | 30d | 40d | 50d | |
| Example 4 | Without water seepage | Without water seepage | Without water seepage | Without water seepage |
| Example 5 | Without water seepage | Without water seepage | Without water seepage | Without water seepage |
| Example 6 | Without water seepage | Without water seepage | Without water seepage | Without water seepage |
| Comparative example 2 | Without water seepage | Without water seepage | Without water seepage | Surface water seepage |
As can be seen from Table 2, the pipes obtained in examples 4 to 6 have good barrier properties and show no leakage at a water pressure of 3MPa for 50 days.
The radial compression test is carried out on the samples 4 to 6 and the comparative samples 1 to 3 under a hydraulic press, and the change rate is measured, and the specific data are shown in the following table 3:
TABLE 3
| 30MPa | 60MPa | 90MPa | 100MPa | |
| Example 4 | 0.35％ | 0.87％ | 25.35％ | 57.85％ |
| Example 5 | 0.27％ | 0.67％ | 21.65％ | 49.78％ |
| Example 6 | 0.43％ | 1.12％ | 33.98％ | 61.45％ |
| Comparative example 1 | 9.45％ | Completely flattened | / | / |
| Comparative example 2 | Without deformation | Without deformation | Collapse | / |
| Comparative example 3 | 2.78％ | 8.52％ | 43.75 | Completely flattened |
As shown in Table 3, in example 5, the radial deformation rate is 21.65% under the pressure of 90MPa, the pipe in comparative example 1 is completely flattened, the cement pipe in comparative example 2 is collapsed, the radial deformation rate in comparative example 3 is 43.75%, and the pipe prepared by the method has good compression resistance.
Examples 4-6 and comparative example 3 were placed on a hydraulic press and pressed down radially at 30MPa repeatedly to record the number of visible flaking off of the cement layer from the substrate, as specified in table 4:
TABLE 4
| Example 4 | Example 5 | Example 6 | Comparative example 3 | |
| Number of times | 277 | 293 | 245 | 122 |
As can be seen from table 4, the number of times of pressing in examples 4-6 is much greater than that in comparative example 3, wherein example 5 is as high as 293, the binding ability of the sizing material and the base material is strong, and the sizing material and the base material are not easy to peel off, because the phosphorus hydroxyl group on the phosphate group on the side chain of the added modified polypropylene particle has a strong chelating effect with the metal surface, and can react with the polyvalent metal to form a phosphate complex, thereby forming a layer of compact phosphate film, the polymer is firmly connected to the metal base material in the form of covalent bond to form a bridge between the polymer and the metal base material, and the mesh cage is subjected to alkali washing and acid washing treatment to remove surface impurities, so that the phosphate group better reacts with the metal base material to obtain chemical bond, and on the other hand, the surface of the steel wire is roughened, the binding sites of the sizing material and the steel wire are increased, the binding force is further improved, and the sizing material has excellent anti-peeling performance.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to 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 invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. 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 is illustrative and explanatory only, and it will be appreciated by those skilled in the art that various modifications, additions and substitutions can be made to the embodiments described without departing from the scope of the invention as defined in the appended claims.
Claims (8)
1. A laying pipe is prepared by casting a mesh cage and a composite sizing material, and is characterized in that the composite sizing material comprises the following raw materials:
modified polypropylene particles, polyethylene particles, butyl rubber powder, an antioxidant, a nucleating agent and a leveling agent;
the modified polypropylene particles are prepared by the following steps:
step A1: mixing allyl chloride and phosphoric acid, adding into a reactor, adding absolute ethyl alcohol and potassium iodide, heating in water bath to 32-37 ℃ under the protection of nitrogen, stirring for reaction for 3-5h, introducing ammonia gas to adjust the pH value of the reaction solution to 6-7, separating liquid, taking an organic phase, removing the absolute ethyl alcohol, and preparing a polymerization monomer;
step A2: adding a polymerization monomer and acetone into a reactor, adding azodiisobutyronitrile, stirring and reacting for 2-3h at room temperature under sealing, and then stirring in a ventilating way to obtain modified polypropylene resin;
step A3: the modified polypropylene resin and the plasticizer DOP are mixed and plasticated, and then extruded and granulated to prepare modified polypropylene particles.
2. The laying pipe according to claim 1 wherein in step A1, the ratio of the amount of allyl chloride, phosphoric acid, absolute ethyl alcohol and potassium iodide is 1 mol: 1.1-1.3 mol: 8-12 mL: 1.3-1.7 g.
3. The laying pipe according to claim 1, wherein in step A2, the ratio of the amount of the polymerization monomer, the acetone and the azobisisobutyronitrile is 15 mL: 20mL of: 0.4-0.6 g.
4. The laying pipe according to claim 1, wherein the modified polypropylene particles and the plasticizer DOP are used in a mass ratio of 100:1.2-1.5 in the step A3.
5. The laying pipe according to claim 1, wherein in the step A3, the modified polypropylene resin is filtered by a 50-mesh screen before use.
6. The laying pipe according to claim 1, wherein the mixing and plastication temperature in step A3 is 160-180 ℃, and the plastication time is 2-3 h.
7. Process for the production of a laying pipe according to claim 1, characterized by the following steps:
preparing a mesh cage: adopting steel wires to form a net cage, setting the density of the steel wires of the inner ring to be 1.8-2.2 cm/piece, the density of the steel wires of the outer ring to be 3.5-4 cm/piece, welding and connecting the steel wires of the inner ring and the outer ring through the steel wires, and setting the density of the steel wires to be 10-12 cm/piece;
and (3) cylinder mould treatment: alkali washing the net cage with sodium carbonate solution at 40-50 deg.c, washing with dilute sulfuric acid after washing with tap water, washing with tap water again, and air drying;
preparing a composite sizing material: banburying modified polypropylene particles, polyethylene particles, butyl rubber powder and an antioxidant at the temperature of 190-;
and (3) casting molding: preheating the mould to 80-100 ℃, placing the mesh cage into the mould for positioning, extruding the composite sizing material into the mould, cooling for forming, and trimming to obtain the laying pipe.
8. The laying pipe according to claim 1, wherein the raw materials of the composite sizing comprise, by weight: 65-80 parts of modified polypropylene particles, 45-60 parts of polyethylene particles, 12-20 parts of butyl rubber powder, 1.8-2.1 parts of antioxidant, 0.4-0.6 part of nucleating agent and 3.5-5 parts of leveling agent.
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| GB1484209A (en) * | 1974-02-04 | 1977-09-01 | Toyo Seikan Kaisha Ltd | Olefin resin-metal bonded structure |
| JPH08224831A (en) * | 1995-02-23 | 1996-09-03 | Sekisui Chem Co Ltd | Composite tube |
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