CN112096973A - Steel wire mesh framework reinforced polypropylene composite pipe and preparation method and application thereof - Google Patents
Steel wire mesh framework reinforced polypropylene composite pipe and preparation method and application thereof Download PDFInfo
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- CN112096973A CN112096973A CN202010972840.XA CN202010972840A CN112096973A CN 112096973 A CN112096973 A CN 112096973A CN 202010972840 A CN202010972840 A CN 202010972840A CN 112096973 A CN112096973 A CN 112096973A
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- 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
- F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
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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
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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
- B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
- B29C48/151—Coating hollow articles
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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
- B29C48/16—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
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- 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
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
- F16L57/02—Protection of pipes or objects of similar shape against external or internal damage or wear against cracking or buckling
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- 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
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
- F16L57/04—Protection of pipes or objects of similar shape against external or internal damage or wear against fire or other external sources of extreme heat
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- 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
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/10—Coatings characterised by the materials used by rubber or plastics
- F16L58/1054—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe
- F16L58/109—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe the coating being an extruded layer
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Abstract
The invention relates to a steel wire mesh framework reinforced polypropylene composite pipe and a preparation method and application thereof. The steel wire reinforced plastic pipe sequentially comprises a polypropylene core pipe, a steel wire reinforced layer, a first bonding resin layer, a second bonding resin layer and a polyethylene outer layer from inside to outside. The first bonding resin layer is composed of maleic anhydride grafted polypropylene, a toughening agent, a bonding force regulator and an anti-aging auxiliary agent. The second bonding resin is composed of an elastomer, polypropylene, polyethylene and an anti-aging auxiliary agent. The problems that polypropylene is used as a base tubular product independently, the low-temperature brittleness is high, polyethylene is used as a base independently, the heat resistance is poor are solved, the use temperature of a conveying medium is increased, and the technical risk of lantern damage caused by bulging and wire drawing easily occurring when the medium is conveyed at the temperature of more than 40 ℃ in the existing polypropylene steel wire mesh framework composite tube is reduced.
Description
Technical Field
The invention belongs to the technical field of steel wire mesh framework reinforced composite pipes, and particularly relates to a steel wire mesh framework reinforced polypropylene composite pipe and a preparation method and application thereof.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
The steel wire wound reinforced plastic composite pipe is a high and new technical product with independent intellectual property rights in China. The novel pipeline is obtained by using a high-strength plastic steel wire mesh framework and thermoplastic plastic polyethylene or polypropylene as raw materials, and fixing steel wires by using maleic anhydride graft modified bonding resin after the steel wires are wound in a left-handed mode and a right-handed mode on a plastic core pipe. Because the high-strength steel wire reinforcement is wrapped in the continuous thermoplastic plastic, the composite pipe overcomes the respective disadvantages of the steel pipe and the plastic pipe, and keeps the respective advantages of the steel pipe and the plastic pipe, so that the composite pipe has higher pressure resistance. Meanwhile, the composite pipe has excellent flexibility and is suitable for long-distance buried water and gas supply pipeline systems.
According to the different types of plastic substrates, the steel wire-wound reinforced plastic composite pipe is usually a polyethylene steel wire-wound reinforced composite pipe or a polypropylene steel wire-wound reinforced composite pipe. The inventors have found that at present polyethylene steel wire-wound reinforced composite pipes are most used. After the temperature rises, the polyethylene softens and the strength of the bonding resin is obviously reduced, creep deformation is easy to occur, and meanwhile, the intermolecular interaction force between the maleic anhydride group of the bonding resin and the surface of the steel wire is greatly weakened at high temperature, so that the highest temperature of the polyethylene steel wire wound reinforced composite pipe conveying medium cannot exceed 40 ℃. The melting point of polypropylene is up to 167 ℃, which is 36 ℃ higher than that of polyethylene, so that the temperature of the medium can reach 70 ℃ for long-term conveying. However, polypropylene steel wire wound reinforced composite pipes are limited in practical application due to the large brittleness of polypropylene base at the temperature lower than 0 ℃.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a steel wire mesh framework reinforced polypropylene composite pipe, and a preparation method and application thereof. The two problems of poor heat resistance of a polyethylene matrix and high brittleness of a polypropylene matrix at low temperature of the steel wire pipe in the prior art are solved.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a steel wire mesh framework reinforced polypropylene composite pipe sequentially comprises a polypropylene core pipe, a steel wire reinforcing layer, a first bonding resin layer, a second bonding resin layer and a polyethylene outer layer from inside to outside, wherein the steel wire reinforcing layer is formed by spirally winding a plurality of steel wires.
Researches show that the problem of high brittleness of the polypropylene steel wire pipe at low temperature is successfully solved by replacing the outer layer of the existing polypropylene steel wire pipe with heat-resistant polyethylene; however, since polypropylene and polyethylene are two different polyolefin materials and have poor compatibility, only the outer layer is replaced by polyethylene, and the outer layer polyethylene cannot be bonded with the maleic anhydride modified polypropylene bonding resin of the steel wire fixing layer.
The problems that polypropylene is used as a base tubular product independently, the low-temperature brittleness is high, polyethylene is used as a base independently, the heat resistance is poor are solved, the use temperature of a conveying medium is increased, and the technical risk of lantern damage caused by bulging and wire drawing easily occurring when the medium is conveyed at the temperature of more than 40 ℃ in the existing polypropylene steel wire mesh framework composite tube is reduced.
In some embodiments of the invention, the polypropylene core tube is a blend of one or both of pipe grade random copolymer polypropylene, block copolymer polypropylene.
In some embodiments of the present invention, the steel wire reinforcement layer is composed of an even number of steel wire winding layers, adjacent steel wire winding layers are a left-handed winding layer and a right-handed winding layer, respectively, and the innermost layer is a left-handed winding layer.
Preferably, the number of the steel wire winding layers is 2-20; more preferably, the number of the steel wire reinforced layers is 2-10; more preferably 2 to 6 layers.
Preferably, the winding angle of the steel wire is 30-70 degrees; preferably 53-56 °; further preferably 54.5 °.
Preferably, the steel wire is one of galvanized steel wire, copper-plated steel wire and non-plated steel wire.
In some embodiments of the present invention, the first adhesive resin partially fills the gaps of the meshes formed by winding the steel wires, and partially is located outside the steel wire reinforcing layer.
In some embodiments of the present invention, the first adhesive resin layer is composed of maleic anhydride grafted polypropylene, a toughening agent, an adhesion regulator, and an anti-aging aid.
In some embodiments of the present invention, the first adhesive resin layer comprises the following components in parts by weight: 10-40 parts of maleic anhydride grafted polypropylene, 40-80 parts of polypropylene, 5-30 parts of toughening agent, 5-20 parts of bonding strength regulator and 0.1-1 part of anti-aging auxiliary agent.
Preferably, the first adhesive resin layer comprises the following components in parts by weight: 25-40 parts of maleic anhydride grafted polypropylene, 44.5-59.7 parts of polypropylene, 5-10 parts of toughening agent, 5-10 parts of adhesion regulator and 0.3-0.5 part of anti-aging auxiliary agent.
The first bonding resin layer is used for coating the steel wire reinforcing layer and fixing the steel wire reinforcing layer, and each component in the first bonding resin layer has a good bonding effect on the polypropylene core pipe and the steel wire reinforcing layer, so that the problem that the interaction between the maleic anhydride group of the existing bonding resin and the molecules on the surface of the steel wire is weak at high temperature is solved. The content of each component is in the range, which is beneficial to improving the binding force and has better binding effect.
Preferably, the toughening agent is at least one of ethylene-propylene copolymer, ethylene-butylene copolymer, ethylene-octene copolymer and ethylene-vinyl acetate copolymer.
Preferably, the adhesion regulator is at least one of ethylene-acrylic acid copolymer, ethylene-methyl acrylate-maleic anhydride terpolymer, ethylene-ethyl acrylate-maleic anhydride terpolymer and ethylene-butyl acrylate-maleic anhydride terpolymer.
In some embodiments of the present invention, the thickness of the first adhesive resin layer is 1 to 10mm thicker than the steel wire reinforcing layer.
In some embodiments of the present invention, the second bonding resin is composed of an elastomer, polypropylene, polyethylene, and an anti-aging aid.
In some embodiments of the present invention, the second adhesive resin comprises the following components in parts by weight: 30-80 parts of elastomer, 10-40 parts of polypropylene, 10-40 parts of polyethylene and 0.1-1 part of anti-aging auxiliary agent.
Preferably, the second adhesive resin comprises the following components in parts by weight: 59.5-69.5 parts of elastomer, 10-20 parts of polypropylene, 20 parts of polyethylene and 0.5 part of anti-aging auxiliary agent.
The second adhesive resin layer has good bonding force with the first adhesive resin layer, and simultaneously has good bonding force with the polyethylene layer, and the second adhesive resin layer within the range has better bonding force.
Preferably, the elastomer is at least one of ethylene-propylene copolymer, ethylene-propylene-diene monomer, ethylene-butene copolymer, and ethylene-octene copolymer.
In some embodiments of the present invention, the anti-aging aid is at least one of an antioxidant, an ultraviolet light stabilizer, and a copper inhibitor.
In some embodiments of the present invention, the thickness of the second adhesive resin layer is 0.5 to 5 mm.
The inventor has invented a second adhesive resin layer for improving the adhesion between the outer polyethylene layer and the maleic anhydride modified polypropylene adhesive resin of the steel wire fixing layer, namely, the maleic anhydride modified polypropylene layer and the outer polyethylene layer of the first adhesive resin layer are effectively adhered together by the second adhesive resin. This helps to develop the properties of polypropylene and polyethylene. The polypropylene has heat resistance, and the polyethylene has low temperature resistance, so that the polypropylene respectively plays an advantage under the condition of high temperature or low temperature, and the polyethylene does not crack, so that after the polypropylene is formed into a whole, the performance can be normally played under the condition of low temperature or high temperature, and the polyethylene does not crack.
In some embodiments of the invention, the outer polyethylene layer is at least one of a pipe grade type I heat resistant polyethylene, a type ii heat resistant polyethylene.
The polypropylene with good heat resistance is used as a core pipe, the heat-resistant PERT is used as an outer layer, the steel wires wound in a left-handed winding mode and a right-handed winding mode are used as reinforcing layers, the modified maleic anhydride grafted polypropylene bonding resin is used as a steel wire fixing layer, and the modified second bonding resin is a polypropylene/polyethylene composite bonding layer, so that the heat resistance of the polypropylene and the low-temperature resistance of the polyethylene are effectively combined, and the defect that the existing polypropylene steel wire pipe is large in low-temperature brittleness is overcome.
In a second aspect, the preparation method of the steel wire mesh framework reinforced polypropylene composite pipe comprises the following specific steps:
forming a steel wire reinforcing layer on the polypropylene core pipe;
extruding a first adhesive resin layer on the steel wire reinforced layer;
extruding a second adhesive resin layer on the outer surface of the first adhesive resin layer;
and extruding a polyethylene outer layer on the outer surface of the second bonding resin layer.
In some embodiments of the invention, the polypropylene core tube is made by extrusion. Preferably, the extrusion temperature is 170-210 ℃; preferably 180-.
In some embodiments of the present invention, the steel wire reinforcement layer is prepared by first left-hand winding a polypropylene core tube to form a left-hand winding layer, then right-hand winding to form a right-hand winding layer, and repeating the steps. Preferably, the winding angle of the steel wire is 30 to 70 °.
In some embodiments of the present invention, the extrusion temperature of the first and second adhesive resin layers is 200-300 ℃; preferably 200-.
In some embodiments of the invention, the extrusion temperature of the polyethylene layer is 170-230 ℃; preferably 190-.
In a third aspect, the steel wire mesh framework reinforced polypropylene composite pipe is applied to the fields of electric power engineering, chemical industry, oil field and gas field, water supply and drainage, mines and the like.
One or more technical schemes of the invention have the following beneficial effects:
the low-temperature impact resistance of the polypropylene steel wire pipe is improved. The polypropylene with good heat resistance is used as a core pipe, the heat-resistant PERT is used as an outer layer, the steel wires wound in a left-handed winding mode and a right-handed winding mode are used as reinforcing layers, the modified maleic anhydride grafted polypropylene bonding resin is used as a steel wire fixing layer, and the modified second bonding resin is a polypropylene/polyethylene composite bonding layer, so that the heat resistance of the polypropylene and the low-temperature resistance of the polyethylene are effectively combined, and the defect that the existing polypropylene steel wire pipe is large in low-temperature brittleness is overcome. When the polypropylene steel wire pipe in the prior art is subjected to a 0 ℃ drop hammer impact test, the core pipe or the outer layer can crack, and when the polypropylene steel wire pipe in the invention is subjected to a-20 ℃ drop hammer impact test, the inner layer and the outer layer of the pipe can not crack.
The high temperature resistance of the polypropylene and the low temperature impact resistance of the polyethylene are combined together, so that the service life of the polypropylene steel wire pipe is prolonged. On one hand, the second bonding resin layer and the PERT outer layer jointly replace a polypropylene outer layer, so that the low-temperature brittleness resistance of the steel wire pipe is greatly improved, and the pipe is not easy to crack in the practical application process; on the other hand, the polyethylene outer layer replaces the polypropylene outer layer, the aging resistance of the pipe is greatly improved, as is known, the light aging resistance of polypropylene is extremely poor, the pipe is easy to pulverize due to exposure to the sun, the polyethylene has better aging resistance compared with the polypropylene, and the aging resistance of the outer layer is greatly improved due to the addition of carbon black for improving the aging resistance and a light aging auxiliary agent, so that the service life of the steel wire pipe is prolonged.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the invention and not to limit the invention.
FIG. 1 is a structural diagram of a steel wire mesh skeleton reinforced polypropylene composite pipe;
the steel wire reinforced plastic composite material comprises a polypropylene core pipe 1, a steel wire reinforced layer 2, a steel wire reinforced layer 3, a first adhesive resin layer 4, a second adhesive resin layer 5, a PERT outer layer 6 and a repeated structural unit.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise. The invention will be further illustrated by the following examples
Example 1
First adhesive resin formulation: 25 parts of maleic anhydride grafted polypropylene;
polypropylene: 59.7 parts of a mixture;
a toughening agent: 10 parts of (A);
adhesive strength adjuster: 5 parts of a mixture;
anti-aging auxiliary agent: 0.3 part;
second adhesive resin formulation: ethylene octene copolymer: 59.5 parts of;
polypropylene: 20 parts of (1);
polyethylene: 20 parts of (1);
anti-aging auxiliary agent: 0.5 part;
s1 polypropylene core tube extrusion: extruding a polypropylene core pipe by pipe processing equipment, wherein the extrusion temperature of the pipe is 180 ℃;
s2 steel wire winding: firstly, winding a layer of steel wire in a left-handed mode on a core pipe, then winding a layer of steel wire in a right-handed mode, wherein the winding angle of the steel wire is 54.5 degrees;
s3 first adhesive resin layer extrusion: extruding first bonding resin on the winding steel wire layer, wherein the thickness of the first bonding resin layer is preferably used for coating the steel wire layer, and the temperature of an extruder for bonding the resin is 240 ℃;
s4 second adhesive resin layer extrusion: extruding a second adhesive resin layer outside the first adhesive resin layer, wherein the temperature of an extruder for adhesive resin is 225 ℃, and the thickness of the second adhesive resin layer is 0.3 mm;
extrusion of the outer polyethylene layer of S5: an outer layer of polyethylene was extruded outside the second bonding resin, and the extruder temperature of the polyethylene was 210 ℃.
Cooling, shaping and cutting the S6 pipe: and cooling and shaping the multilayer composite pipe through a pipe, and cutting the pipe into required length to obtain the multilayer composite high-temperature-resistant polypropylene steel wire mesh framework composite pipe.
Testing the peel strength of the pipe according to CJ/T189; testing the pipe according to CJ/T189, wherein the hydrostatic pressure is tested at 20 ℃, 2PN and 1h for a short period; after the pipe is placed at a constant temperature of-20 ℃ for 24 hours, a 3kg weight is adopted to perform a drop hammer impact test on the pipe from a height of 2m, and the cracking conditions of the core pipe and the outer layer of the pipe are shown in table 1.
Comparative example 1 (outer layer of polypropylene):
the formulation of the first adhesive resin was the same as in example 1.
S1 polypropylene core tube extrusion: extruding a polypropylene core pipe through pipe processing equipment, wherein the extrusion temperature of the pipe is 180-190 ℃;
s2 steel wire winding: firstly, winding a layer of steel wire in a left-handed mode on a core pipe, then winding a layer of steel wire in a right-handed mode, wherein the winding angle of the steel wire is 54.5 degrees;
s3 first adhesive resin layer extrusion: extruding first bonding resin on the winding steel wire layer, wherein the thickness of the first bonding resin layer is preferably used for coating the steel wire layer, and the temperature of an extruder for bonding the resin is 240 ℃;
extrusion of the outer layer of S5 Polypropylene: extruding an outer layer of polypropylene outside the first bonding resin, wherein the temperature of an extruder for the polyethylene is 18-190 ℃.
Cooling, shaping and cutting the S6 pipe: and cooling and shaping the multilayer composite pipe through a pipe, and cutting the pipe into required length to obtain the multilayer composite high-temperature-resistant polypropylene steel wire mesh framework composite pipe.
Testing the peel strength of the pipe according to CJ/T189; testing the pipe according to CJ/T189, wherein the hydrostatic pressure is tested at 20 ℃, 2PN and 1h for a short period; after the pipe is placed at a constant temperature of-20 ℃ for 24 hours, a 3kg weight is adopted, a drop hammer impact test is carried out on the pipe from the height of 2m, and the cracking conditions of the core pipe and the outer layer of the pipe are shown in the table 1.
Comparative example 2 (without second adhesive resin layer):
the formulation of the first adhesive resin was the same as in example 1.
S1 polypropylene core tube extrusion: extruding a polypropylene core pipe through pipe processing equipment, wherein the extrusion temperature of the pipe is 180-190 ℃;
s2 steel wire winding: firstly, winding a layer of steel wire in a left-handed mode on a core pipe, then winding a layer of steel wire in a right-handed mode, wherein the winding angle of the steel wire is 54.5 degrees;
s3 first adhesive resin layer extrusion: extruding first bonding resin on the winding steel wire layer, wherein the thickness of the first bonding resin layer is preferably used for coating the steel wire layer, and the temperature of an extruder for bonding the resin is 240 ℃;
extrusion of the outer polyethylene layer of S5: and extruding a polyethylene outer layer outside the first bonding resin, wherein the temperature of an extruder for extruding the polyethylene is 200 ℃ and 210 ℃.
Cooling, shaping and cutting the S6 pipe: and cooling and shaping the multilayer composite pipe through a pipe, and cutting the pipe into required length to obtain the multilayer composite high-temperature-resistant polypropylene steel wire mesh framework composite pipe.
Testing the peel strength of the pipe according to CJ/T189; testing the pipe according to CJ/T189, wherein the hydrostatic pressure is tested at 20 ℃, 2PN and 1h for a short period; after the pipe is placed at a constant temperature of-20 ℃ for 24 hours, a 3kg weight is adopted, a drop hammer impact test is carried out on the pipe from the height of 2m, and the cracking conditions of the core pipe and the outer layer of the pipe are shown in the table 1.
Example 2
First adhesive resin formulation:
maleic anhydride grafted polypropylene: 40 parts of a mixture;
polypropylene: 44.5 parts;
a toughening agent: 5 parts of a mixture;
adhesive strength adjuster: 10 parts of (A);
anti-aging auxiliary agent: 0.5 part;
second adhesive resin formulation:
ethylene octene copolymer: 69.5 parts of a mixture;
polypropylene: 10 parts of (A);
polyethylene: 20 parts of (1);
anti-aging auxiliary agent: 0.5 part;
s1 polypropylene core tube extrusion: extruding a polypropylene core pipe by pipe processing equipment, wherein the extrusion temperature of the pipe is 195 ℃;
s2, winding the front two steel wires and extruding the first adhesive resin layer: firstly, winding a layer of steel wire in a left-handed mode on a core pipe, then winding a layer of steel wire in a right-handed mode, wherein the winding angle of the steel wire is 54.5 degrees; extruding first bonding resin on the winding steel wire layer, wherein the thickness of the first bonding resin layer is preferably used for coating the steel wire layer, and the temperature of an extruder for bonding the resin is 225 ℃;
s3, winding the rear two steel wires and extruding the first adhesive resin layer: winding a layer of steel wires on the adhesive resin of S2 in a left-handed mode, and then winding a layer of steel wires in a right-handed mode, wherein the winding angle of the steel wires is 54.5 degrees; extruding first bonding resin on the winding steel wire layer, wherein the thickness of the first bonding resin layer is preferably used for coating the steel wire layer, and the temperature of an extruder for bonding the resin is 225 ℃;
s4 extrusion of second adhesive resin layer: extruding a second adhesive resin layer outside the first adhesive resin layer, wherein the temperature of an extruder for adhesive resin is 200 ℃, and the thickness of the second adhesive resin layer is 0.5 mm;
extrusion of the outer polyethylene layer of S5: an outer layer of polyethylene was extruded outside the second bonding resin, and the extruder temperature of the polyethylene was 190 ℃.
Cooling, shaping and cutting the S6 pipe: and cooling and shaping the multilayer composite pipe through a pipe, and cutting the pipe into required length to obtain the multilayer composite high-temperature-resistant polypropylene steel wire mesh framework composite pipe.
The structure of the steel wire mesh framework reinforced polypropylene composite pipe obtained in embodiment 2 is shown in fig. 1, the steel wire mesh framework reinforced polypropylene composite pipe sequentially comprises a polypropylene core pipe 1, a steel wire reinforcing layer 2, a first adhesive resin layer 3, a second adhesive resin layer 4 and a polyethylene layer 5 from inside to outside, wherein the steel wire winding layer and the first adhesive resin have a repeating structural unit 6, namely four steel wire winding layers, but the outer layer of the polypropylene core pipe is still the steel wire winding layer, the first adhesive resin part fills in grid gaps formed by winding steel wires, and the part is located on the outer side of the steel wire reinforcing layer. The first bonding resin fills the grid gaps formed by winding the steel wires, and ensures the excellent fixing effect of the first bonding resin on the steel wire reinforcing layer.
Testing the peel strength of the pipe according to CJ/T189; testing the pipe according to CJ/T189, wherein the hydrostatic pressure is tested at 20 ℃, 2PN and 1h for a short period; after the pipe is placed at a constant temperature of-20 ℃ for 24 hours, a 3kg weight is adopted to perform a drop hammer impact test on the pipe, and relevant data of the cracking conditions of the core pipe and the outer layer of the pipe are shown in table 1.
TABLE 1 pipe Peel Strength test and 20 deg.C, 2 times PN hydrostatic pressure, Low temperature impact test data
As can be seen from the comparison between example 1 and comparative example 1, the example 1 using the second adhesive resin and the outer layer of the heat-resistant polyethylene can ensure that the peel strength meets the requirement that the standard CJ/T189 is more than 10N/mm, and the inner and outer layers of the pipe are not cracked when the pipe is impacted by a falling weight at-20 ℃;
as can be seen from the comparison of example 1 and comparative example 2, with the outer layer of heat-resistant polyethylene without the second adhesive resin layer, the peel strength of comparative example 2 fails to meet the requirement that the standard CJ/T189 is greater than 10N/mm, and the core tube of the pipe is cracked when the drop impact is applied at-20 ℃;
from the performance data shown in the above tables for examples 1-2 and comparative examples 1, 2, it can be seen that: only by introducing the second adhesive resin layer and the PERT outer layer, the peeling strength and the hydrostatic pressure test of 2 times PN and 1h at 20 ℃ of the polypropylene steel wire pipe can reach the requirements of CJ/T189, and the pipe cannot crack when being subjected to drop hammer impact at-20 ℃.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a compound pipe of steel mesh skeleton reinforcing polypropylene which characterized in that: the steel wire reinforced plastic pipe comprises a polypropylene core pipe, a steel wire reinforced layer, a first bonding resin layer, a second bonding resin layer and a polyethylene outer layer from inside to outside in sequence, wherein the steel wire reinforced layer is formed by spirally winding a plurality of steel wires.
2. The steel wire mesh skeleton-reinforced polypropylene composite pipe as claimed in claim 1, wherein: the polypropylene core pipe is one or two blends of pipe-grade random copolymer polypropylene and block copolymer polypropylene.
3. The steel wire mesh skeleton-reinforced polypropylene composite pipe as claimed in claim 1, wherein: the steel wire reinforcing layer consists of even steel wire winding layers, the adjacent steel wire winding layers are respectively a left-handed winding layer and a right-handed winding layer, and the innermost layer is a left-handed winding layer;
preferably, the number of the steel wire winding layers is 2-20; more preferably, the number of the steel wire reinforced layers is 2-10; further preferably 2 to 6 layers;
preferably, the winding angle of the steel wire is 30-70 degrees; preferably 53-56 °; further preferably 54.5 °;
preferably, the steel wire is one of galvanized steel wire, copper-plated steel wire and non-plated steel wire.
4. The steel wire mesh skeleton-reinforced polypropylene composite pipe as claimed in claim 1, wherein: the first adhesive resin partially fills the gaps between the meshes formed by winding the steel wires, and partially is located outside the steel wire reinforcement layer.
5. The steel wire mesh skeleton-reinforced polypropylene composite pipe as claimed in claim 1, wherein: the first bonding resin layer is composed of maleic anhydride grafted polypropylene, a toughening agent, a bonding force regulator and an anti-aging auxiliary agent;
preferably, the first adhesive resin layer comprises the following components in parts by weight: 10-40 parts of maleic anhydride grafted polypropylene, 40-80 parts of polypropylene, 5-30 parts of toughening agent, 5-20 parts of bonding force regulator and 0.1-1 part of anti-aging auxiliary agent;
further preferably, the first adhesive resin layer comprises the following components in parts by weight: 25-40 parts of maleic anhydride grafted polypropylene, 44.5-59.7 parts of polypropylene, 5-10 parts of toughening agent, 5-10 parts of adhesion regulator and 0.3-0.5 part of anti-aging auxiliary agent;
preferably, the toughening agent is at least one of ethylene-propylene copolymer, ethylene-butylene copolymer, ethylene-octene copolymer and ethylene-vinyl acetate copolymer;
preferably, the adhesion regulator is at least one of ethylene-acrylic acid copolymer, ethylene-methyl acrylate-maleic anhydride terpolymer, ethylene-ethyl acrylate-maleic anhydride terpolymer and ethylene-butyl acrylate-maleic anhydride terpolymer;
or the thickness of the first bonding resin layer is 1-10mm thicker than the reinforcing layer of the steel wire.
6. The steel wire mesh skeleton-reinforced polypropylene composite pipe as claimed in claim 1, wherein: the second bonding resin consists of an elastomer, polypropylene, polyethylene and an anti-aging auxiliary agent;
preferably, the second adhesive resin comprises the following components in parts by weight: 30-80 parts of elastomer, 10-40 parts of polypropylene, 10-40 parts of polyethylene and 0.1-1 part of anti-aging auxiliary agent;
further preferably, the second adhesive resin comprises the following components in parts by weight: 59.5-69.5 parts of elastomer, 10-20 parts of polypropylene, 20 parts of polyethylene and 0.5 part of anti-aging auxiliary agent;
preferably, the elastomer is at least one of ethylene-propylene copolymer, ethylene-propylene-diene monomer, ethylene-butene copolymer and ethylene-octene copolymer;
preferably, the anti-aging auxiliary agent is at least one of an antioxidant, an ultraviolet light stabilizer and a copper inhibitor;
or the thickness of the second bonding resin layer is 0.5-5 mm;
or the polyethylene outer layer is at least one of pipeline-grade I-type heat-resistant polyethylene and II-type heat-resistant polyethylene.
7. The method for preparing the steel wire mesh framework reinforced polypropylene composite pipe as claimed in any one of claims 1 to 6, which is characterized in that: the method comprises the following specific steps:
forming a steel wire reinforcing layer on the polypropylene core pipe;
extruding a first adhesive resin layer on the steel wire reinforced layer;
extruding a second adhesive resin layer on the outer surface of the first adhesive resin layer;
extruding a polyethylene outer layer on the outer surface of the second bonding resin layer;
preferably, the preparation method of the polypropylene core tube is an extrusion molding method; further preferably, the extrusion temperature is 170-210 ℃; preferably 180-195 ℃;
preferably, the preparation method of the steel wire reinforcement layer comprises the steps of firstly carrying out left-hand winding on the polypropylene core pipe to form a left-hand winding layer, then carrying out right-hand winding to form a right-hand winding layer, and repeating; preferably, the winding angle of the steel wire is 30 to 70 °.
8. The preparation method of the steel wire mesh framework reinforced polypropylene composite pipe as claimed in claim 7, wherein the preparation method comprises the following steps: the extrusion temperature of the first bonding resin layer and the second bonding resin layer is 200-300 ℃; preferably 200-.
9. The preparation method of the steel wire mesh framework reinforced polypropylene composite pipe as claimed in claim 7, wherein the preparation method comprises the following steps: the extrusion temperature of the polyethylene layer is 170-230 ℃; preferably 190-.
10. The use of the steel wire mesh skeleton-reinforced polypropylene composite pipe as defined in any one of claims 1 to 6 in the fields of electrical engineering, chemical industry, oil field and gas field, water supply and drainage, and mining.
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