CN114773712A - Formula and manufacturing method of low-temperature-resistant flame-retardant outer protective pipe - Google Patents
Formula and manufacturing method of low-temperature-resistant flame-retardant outer protective pipe Download PDFInfo
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- 239000003063 flame retardant Substances 0.000 title claims abstract description 62
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 230000001681 protective effect Effects 0.000 title claims abstract description 40
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- 239000004698 Polyethylene Substances 0.000 claims abstract description 37
- -1 polyethylene Polymers 0.000 claims abstract description 37
- 229920000573 polyethylene Polymers 0.000 claims abstract description 37
- 239000004594 Masterbatch (MB) Substances 0.000 claims abstract description 23
- 239000002994 raw material Substances 0.000 claims abstract description 21
- 229920000092 linear low density polyethylene Polymers 0.000 claims abstract description 14
- 239000004707 linear low-density polyethylene Substances 0.000 claims abstract description 14
- 229920001903 high density polyethylene Polymers 0.000 claims abstract description 10
- 239000004700 high-density polyethylene Substances 0.000 claims abstract description 10
- 229920001577 copolymer Polymers 0.000 claims abstract description 9
- 239000004712 Metallocene polyethylene (PE-MC) Substances 0.000 claims abstract description 6
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- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims abstract description 4
- ADCOVFLJGNWWNZ-UHFFFAOYSA-N antimony trioxide Chemical compound O=[Sb]O[Sb]=O ADCOVFLJGNWWNZ-UHFFFAOYSA-N 0.000 claims description 16
- 238000001816 cooling Methods 0.000 claims description 16
- 238000003851 corona treatment Methods 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 10
- 239000012530 fluid Substances 0.000 claims description 9
- 150000001875 compounds Chemical class 0.000 claims description 8
- 238000005520 cutting process Methods 0.000 claims description 8
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- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 7
- 230000002829 reductive effect Effects 0.000 claims description 7
- 238000004513 sizing Methods 0.000 claims description 7
- BIKXLKXABVUSMH-UHFFFAOYSA-N trizinc;diborate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]B([O-])[O-].[O-]B([O-])[O-] BIKXLKXABVUSMH-UHFFFAOYSA-N 0.000 claims description 7
- DEIGXXQKDWULML-UHFFFAOYSA-N 1,2,5,6,9,10-hexabromocyclododecane Chemical compound BrC1CCC(Br)C(Br)CCC(Br)C(Br)CCC1Br DEIGXXQKDWULML-UHFFFAOYSA-N 0.000 claims description 6
- 230000007797 corrosion Effects 0.000 claims description 6
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/38—Boron-containing compounds
- C08K2003/387—Borates
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
-
- 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 provides a formula of a low-temperature-resistant flame-retardant outer protective pipe, which comprises the following components in parts by mass: 50-80 parts of high-density polyethylene, 5-30 parts of linear low-density polyethylene, 0-10 parts of ethylene-acetic acid copolymer, 0-10 parts of ethylene-vinyl acetate copolymer modified polyethylene, 2-10 parts of black master batch, 5-20 parts of flame-retardant master batch, 5-20 parts of metallocene polyethylene and/or 5-15 parts of ethylene-octene copolymer. The invention also provides a manufacturing method of the low-temperature-resistant flame-retardant outer protection pipe adopting the formula. The polyethylene outer protective pipe prepared by the method is improved from the two aspects of raw material proportion and production process, not only maintains good tensile strength and elongation at break, but also improves the low temperature resistance and flame retardance of the outer protective pipe.
Description
Technical Field
The invention relates to a heat-insulating pipeline, in particular to a prefabricated direct-buried heat-insulating pipeline, and specifically relates to a formula and a manufacturing method of a low-temperature-resistant flame-retardant outer protecting pipe.
Background
The foam prefabricated direct-buried heat-insulating pipe usually comprises a three-layer structure, namely a steel pipe, a rigid polyurethane foam heat-insulating layer and a polyethylene outer sleeve protective layer from inside to outside in sequence. The polyethylene outer sleeve protective layer is also called an outer protective pipe, and is a black polyethylene pipe which is prefabricated by processing through an extruder and has a certain wall thickness, the outer protective pipe can effectively protect the polyurethane insulating layer, the polyurethane insulating layer is protected from being damaged by mechanical hard objects, and the outer protective pipe is anticorrosive and waterproof, so that the quality requirement of the polyethylene outer protective pipe has an important effect on the foam prefabricated direct-buried insulating pipe.
In cold winter, when the environmental temperature is below minus 5 to minus 20 ℃, the outer protective pipe of polyethylene or the whole polyethylene pipe is cracked in construction lines and stacking places. Most of the heat-preservation straight pipes are axially cracked on the outer protection pipe, the cracks are regular in shape, the heat-preservation bent pipes are mostly cracked in different ranges through circumferential welding seams of the outer protection pipe and the axial pipe body, and the cracks are irregular in shape. The protection effect of the polyethylene outer protective pipe is greatly reduced due to cracking, even the protection effect is completely lost, the heat insulation of the heat insulation layer is damaged, and the normal work of the innermost pipe fitting is influenced; the cracking of the circumferential welding seam leads to the disconnection of the pipeline and the loss of the heat preservation effect of the heat preservation layer, and the pipeline and the heat preservation layer have great potential safety hazards.
In addition, the existing prefabricated direct-buried heat-insulating pipe does not excessively consider the flame retardance of the outer protective pipe, the melting point of the outer protective pipe is lower, and when the heat-insulating pipe is welded and fixed, a hot welding core and soldering tin easily drop onto the outer protective pipe to scald the outer protective pipe, so that the outer protective pipe loses the protection effect, and unnecessary loss is caused.
For the above reasons, it is an urgent problem to improve the performance of the prefabricated direct-buried heat-insulating pipe at low temperature, prevent the outer polyethylene pipe from cracking and separating, and improve the flame retardancy of the outer polyethylene pipe.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a formula and a manufacturing method of a low-temperature-resistant flame-retardant outer protection pipe, which improve the performance of a prefabricated direct-buried heat-insulation pipe at low temperature and prevent the polyethylene outer protection pipe from cracking and separating by improving the raw material ratio and the production process.
In order to achieve the purpose, the invention adopts the following technical scheme:
the formula of the low-temperature-resistant flame-retardant outer protection pipe comprises the following components in percentage by mass: 50-80 parts of high-density polyethylene, 5-30 parts of linear low-density polyethylene, 0-10 parts of ethylene-acetic acid copolymer, 0-10 parts of ethylene-vinyl acetate copolymer modified polyethylene, 2-10 parts of black master batch, 5-20 parts of flame-retardant master batch, 5-20 parts of metallocene polyethylene and/or 5-15 parts of ethylene-octene copolymer.
The flame-retardant master batch is formed by premixing a flame retardant and a high molecular compound, wherein the flame retardant comprises at least one of the following components: organic matter with fire retardant property and inorganic matter with fire retardant property; the inorganic matter with flame retardant property comprises at least one of antimony trioxide, zinc borate and aluminum hydroxide.
The polymer compound includes: polyethylene, cellulose and starch.
The flame-retardant master batch is particles prepared by mixing 20WT% -40WT% of hexabromocyclododecane, 15WT% -30WT% of zinc borate, 15WT% -30WT% of antimony trioxide, 5WT% -15WT% of aluminum hydroxide, 10WT% -20WT% of linear low-density polyethylene and 5WT% -20WT% of high-density polyethylene.
The linear low-density polyethylene is not less than 8 parts.
The linear low-density polyethylene accounts for 10-12 parts.
The black master batch is carbon black particles.
The invention also provides a manufacturing method of the low-temperature-resistant flame-retardant outer protective pipe using the formula, which comprises the following steps;
step S1, drying the mixed materials, stirring and mixing the prepared raw materials uniformly, and drying the raw materials;
step S2, plasticizing and extruding, namely conveying the raw material processed in the step S1 to an extruder, melting and homogenizing the raw material by the extruder to change the raw material from solid particles into viscous fluid, and then continuously extruding; during extrusion, the temperature of a feed inlet of the extruder is 70-120 ℃, the heating temperature of a cylinder of the extruder is 160-240 ℃, the heating temperature of a machine head of the extruder is 190-220 ℃, and the heating temperature of a neck mold is 190-220 ℃;
step S3, mold forming, namely, feeding the viscous fluid obtained in the step S2 into a mold from an extruder, fusing and compacting the viscous fluid into a tube blank at a forming section of the mold after spiral separation, and extruding the tube blank from a die;
step S4, cooling and shaping, namely, under the negative pressure condition, the hot tube blank extruded from the neck mold is sleeved in a vacuum sizing box according to the sizing for preliminary shaping and cooling, and then the interior of the tube is cooled and fixed and shaped in a spray cooling box;
step S5, performing corona treatment, wherein corona treatment equipment comprises a corona treatment power supply, an inner electrode and an outer electrode, the outer electrode is a corrosion-resistant metal plate, the inner electrode is an annular corrosion-resistant conductor, and the inner electrode is positioned in a pipeline cavity of the formed pipe and is coaxial with the pipeline cavity; through corona treatment, the surface tension of the pipeline cavity of the polyethylene outer protection pipe is reduced, and the bonding capability of the polyethylene outer protection pipe and the heat insulation layer is improved;
and step S6, cutting, namely cutting the pipe at fixed length, wherein the cut pipe is the final finished product.
The principle of the invention is as follows:
considering the fire resistance, the fire retardant is generally an inorganic substance or an organic substance with low molecular weight, and the addition of a large amount of fire retardant can cause adverse effects on the performance (such as elongation at break) of the outer protective pipe, and the outer protective pipe can not be normally used in severe cases; the content of Linear Low Density Polyethylene (LLDPE) is improved, the good properties of the outer protective pipe such as elongation at break and the like can be kept under the condition that a large amount of flame retardant is added, and the weight percentage content of the Linear Low Density Polyethylene (LLDPE) cannot be too high, and the outer protective pipe is too soft when the weight percentage content of the Linear Low Density Polyethylene (LLDPE) is too high;
secondly, the elongation at break of the polyethylene outer protection pipe is a main factor influencing the cracking of the outer protection pipe, so that the elongation at break of the polyethylene outer protection pipe is improved, and the cracking condition of the outer protection pipe can be reduced; in the invention, the breaking elongation of the polyethylene outer protective pipe is improved by adding a proper amount of ethylene-acetic acid copolymer with high elongation, ethylene-vinyl acetate copolymer modified polyethylene or Linear Low Density Polyethylene (LLDPE); in addition, the tensile strength and the elongation at break of the polyethylene outer protective pipe are improved by adding a small amount of Metallocene Polyethylene (MPE) and/or ethylene-octene copolymer (POE).
The invention has the beneficial effects that: according to the formula and the manufacturing method of the polyethylene outer protective pipe, provided by the invention, through a reasonable formula and process, on the premise of improving the flame retardance of the polyethylene outer protective pipe, the breaking elongation and the tensile strength of the polyethylene outer protective pipe are improved; the polyethylene outer protective pipe manufactured according to the formula and the processing parameters provided by the invention has better low-temperature resistance and flame retardance.
Drawings
FIG. 1 is a schematic view of the extruder in the example of the present invention.
Fig. 2 is a schematic view of an outer protective tube production line according to an embodiment of the present invention.
In the figure: 1. the device comprises a feeding hole, 2, a machine barrel, 3, a machine head, 4, a mouth mold, 5, a shaping device, 6, a spray cooling box, 7, a traction device, 8, corona treatment equipment, 9, a cutting device, 10 and an outer protective pipe.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the drawings and the embodiments of the specification, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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.
Example 1
The production line of the outer protective pipe is the prior art and comprises an extruder, a sizing device 5, a spray cooling box 6, a traction device 7, a corona treatment device 8 and a cutting device 9, wherein the raw materials of the low-temperature resistant flame-retardant outer protective pipe adopt the formula of the invention, and the components of the formula and the mass ratio of the components are as follows: 60 parts of high-density polyethylene, 10 parts of linear low-density polyethylene, 5 parts of ethylene-acetic acid copolymer, 5 parts of ethylene-vinyl acetate copolymer modified polyethylene, 4 parts of black master batch, 8 parts of flame-retardant master batch and 8 parts of metallocene polyethylene.
The manufacturing method of the low-temperature-resistant flame-retardant outer protective pipe comprises the following steps:
step S1, mixing and drying, namely stirring and mixing the prepared raw materials uniformly and drying the raw materials;
step S2, plasticizing and extruding, namely conveying the raw materials processed in the step S1 to an extruder, melting and homogenizing the raw materials by the extruder to change the solid particles into viscous fluid, and then continuously extruding; during extrusion, the temperature of a feed inlet of the extruder is 80 ℃, the heating temperature of a machine barrel of the extruder is 170-220 ℃, the heating temperature of a machine head of the extruder is 200-210 ℃, and the heating temperature of a neck ring mold is 190 ℃; specifically, each heating part of the extruder is shown in FIG. 1;
step S3, mold forming, namely, feeding the viscous fluid obtained in the step S2 into a mold from an extruder, fusing and compacting the viscous fluid into a tube blank at a forming section of the mold after spiral separation, and extruding the tube blank from a die; specifically, during extrusion, the rotating speed of a main machine is 85r/min, the traction rotating speed is 465 mm/min, materials extruded from the extruder enter a die through linear motion changed from rotary motion to linear motion according to a filter plate, are fused and compacted into a tubular parison at a molding section of the die after being subjected to spiral separation, and are finally extruded out from a neck mold;
step S4, cooling and shaping, namely, under the negative pressure condition, the hot tube blank extruded from the neck mold is initially shaped and cooled in a vacuum sizing box of a shaping device according to sizing sleeve, and then the interior of the tube is cooled and fixed and shaped in a spray cooling box; specifically, in the extrusion molding process, the cooling and shaping of the high-temperature tube blank are matched with a proper cooling mode and proper cooling water temperature; when the cooling is not timely, the tube blank can deform under the action of self gravity or the clamping pressure of a tractor; the shaping and cooling are usually carried out simultaneously, and the cooling is too fast, so that stress is easily generated in the pipe, and the internal quality and the appearance quality are reduced; in the invention, the setting range of the cooling temperature is 15-40 ℃, and when the cooling water temperature is 20 ℃, the positions and the number of the cooling points are reasonably set according to the pipe diameter, the wall thickness and the extrusion speed;
s5, performing corona treatment, wherein the shaped pipe moves forward under the driving of a traction device, and the corona treatment is performed by a corona treatment device, the corona treatment device comprises a corona treatment power supply, an inner electrode and an outer electrode, the outer electrode is a corrosion-resistant metal plate, the inner electrode is an annular corrosion-resistant conductor, and the inner electrode is positioned in a pipeline cavity of the shaped pipe and is coaxial with the pipeline cavity; through corona treatment, the surface tension of a pipeline cavity of the polyethylene outer protection pipe is reduced, and the bonding capability of the polyethylene outer protection pipe and the heat insulation layer is improved; the corona technology is that high-voltage special electrodes are utilized to generate high-voltage partial discharge, namely corona discharge, between the electrodes, so that the surface of neutral polyethylene has certain polarity; in a high-voltage electric field, air is ionized into positive and negative charged particles and is accelerated to impact the surface of the pipe, so that the surface performance of polyethylene is changed; the pipe generates active free radicals under the impact of high-energy particles, and the active free radicals are combined with each other in a covalent bond mode, so that cross-linking between molecules is formed; the molecular structure of the pipe is changed into a three-dimensional network structure from a linear molecular structure, and the polyethylene can be oxidized along with gas discharge to promote the surface layer of the polyethylene to form polarity; along with the increase of corona voltage, the surface tension of the polyethylene outer protective pipe is continuously reduced, and the bonding capability with the heat-insulating layer is enhanced;
and step S6, cutting, namely cutting the pipe at fixed length, wherein the cut pipe is the final finished product.
In this embodiment, the flame-retardant masterbatch is a granule prepared by mixing 20WT% -40WT% of hexabromocyclododecane, 15WT% -30WT% of zinc borate, 15WT% -30WT% of antimony trioxide, 5WT% -15WT% of aluminum hydroxide, 10WT% -20WT% of linear low density polyethylene, and 5WT% -20WT% of high density polyethylene.
Specifically, the flame-retardant master batch comprises a high molecular compound and at least one of the following two: organic matter with fire retardant property and inorganic matter with fire retardant property. Commonly used flame retardants include inorganic and nonflammable organic materials such as antimony trioxide, hexabromocyclododecane, and the like. The inventor of the present invention finds that if the flame retardant is directly added into the raw material of the flame-retardant outer protective tube, the flame retardant has poor compatibility with other high molecular components, and when the low temperature resistant flame-retardant outer protective tube is manufactured, the flame retardant is easily separated from other high molecular components, so that defects are formed in the low temperature resistant flame-retardant outer protective tube, and physical properties (such as tensile yield strength, etc.) of the outer protective tube are affected. In order to solve the problem, the inventor of the present invention finds that the flame retardant and the high molecular compound are mixed in advance to form the flame retardant master batch, and then the flame retardant master batch is added into the raw material of the outer protective tube, so that the compatibility of the flame retardant master batch and other high molecular compounds is good, and the problem is well solved.
In the flame-retardant masterbatch used in this embodiment, hexabromocyclododecane, zinc borate, antimony trioxide, and aluminum hydroxide all play a role in flame retardation, and belong to the above organic matter having flame retardant property and inorganic matter having flame retardant property, that is, a flame retardant; the linear low-density polyethylene and the high-density polyethylene belong to the high molecular compounds in the flame-retardant master batch. The linear low-density polyethylene and the high-density polyethylene are mixed with hexabromocyclododecane, zinc borate, antimony trioxide and aluminum hydroxide to form the flame-retardant master batch, and the problem of compatibility between the flame retardant and other high-molecular components in the raw materials of the outer protective pipe is well solved due to the existence of the linear low-density polyethylene and the high-density polyethylene.
The black masterbatch used in this example was carbon black pellets.
The invention firstly solves the problem of compatibility of the flame retardant and the high molecular component, and then the low temperature resistance of the outer protective pipe can be better improved on the premise of keeping good physical properties according to the raw material components and the proportion provided by the invention.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
The present invention is not described in detail in the prior art.
Claims (8)
1. The formula of the low-temperature-resistant flame-retardant outer protective pipe is characterized in that: the formula comprises the following components in percentage by mass: 50-80 parts of high-density polyethylene, 5-30 parts of linear low-density polyethylene, 0-10 parts of ethylene-acetic acid copolymer, 0-10 parts of ethylene-vinyl acetate copolymer modified polyethylene, 2-10 parts of black master batch, 5-20 parts of flame-retardant master batch, 5-20 parts of metallocene polyethylene and/or 5-15 parts of ethylene-octene copolymer.
2. The formulation of the low temperature resistant flame retardant outer sheath according to claim 1, wherein: the flame-retardant master batch is formed by premixing a flame retardant and a high molecular compound, wherein the flame retardant comprises at least one of the following two: organic matter with fire retardant property and inorganic matter with fire retardant property; the inorganic matter with flame retardant property comprises at least one of antimony trioxide, zinc borate and aluminum hydroxide.
3. The formulation of a low temperature resistant flame retardant outer sheath according to claim 2, wherein:
the polymer compound includes: polyethylene, cellulose and starch.
4. The formulation of a low temperature resistant flame retardant outer sheath according to claim 1, wherein: the flame-retardant master batch is particles prepared by mixing 20WT% -40WT% of hexabromocyclododecane, 15WT% -30WT% of zinc borate, 15WT% -30WT% of antimony trioxide, 5WT% -15WT% of aluminum hydroxide, 10WT% -20WT% of linear low-density polyethylene and 5WT% -20WT% of high-density polyethylene.
5. The formulation of a low temperature resistant flame retardant outer sheath according to claim 1, wherein: the linear low-density polyethylene is not less than 8 parts.
6. The formulation of a low temperature resistant flame retardant outer sheath according to claim 1, wherein: the linear low-density polyethylene accounts for 10-12 parts.
7. The formulation of the low temperature resistant flame retardant outer sheath according to claim 1, wherein: the black master batch is carbon black granules.
8. A method for manufacturing a low temperature resistant flame retardant outer sheath using the formulation of claims 1-7, characterized in that: comprises the following steps;
step S1, mixing and drying, namely stirring and mixing the prepared raw materials uniformly and drying the raw materials;
step S2, plasticizing and extruding, namely conveying the raw material processed in the step S1 to an extruder, melting and homogenizing the raw material by the extruder to change the raw material from solid particles into viscous fluid, and then continuously extruding; during extrusion, the temperature of a feed inlet of the extruder is 70-120 ℃, the heating temperature of a cylinder of the extruder is 160-240 ℃, the heating temperature of a machine head of the extruder is 190-220 ℃, and the heating temperature of a neck mold is 190-220 ℃;
step S3, mold forming, namely, feeding the viscous fluid obtained in the step S2 into a mold from an extruder, fusing and compacting the viscous fluid into a tube blank at a forming section of the mold after spiral separation, and extruding the tube blank from a die;
step S4, cooling and shaping, namely, under the negative pressure condition, the hot tube blank extruded from the neck mold is initially shaped and cooled in a vacuum sizing box according to the sizing sleeve, and then the interior of the tube is cooled and fixed and shaped in a spray cooling box;
step S5, performing corona treatment, wherein corona treatment equipment comprises a corona treatment power supply, an inner electrode and an outer electrode, the outer electrode is a corrosion-resistant metal plate, the inner electrode is an annular corrosion-resistant conductor, and the inner electrode is positioned in a pipeline cavity of the formed pipe and is coaxial with the pipeline cavity; through corona treatment, the surface tension of the pipeline cavity of the polyethylene outer protection pipe is reduced, and the bonding capability of the polyethylene outer protection pipe and the heat insulation layer is improved;
and step S6, cutting, namely cutting the pipe in a fixed length, wherein the cut pipe is the final finished product.
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