CN111234348B - Special material for buried polyethylene structural wall pipeline and preparation method thereof - Google Patents
Special material for buried polyethylene structural wall pipeline and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a special material for buried polyethylene structural wall pipelines, which comprises the following preparation raw materials in parts by weight: 10-40 parts of pipe grade polyethylene, 10-30 parts of hollow grade polyethylene, 3-10 parts of injection grade polyethylene, 20-45 parts of film grade linear polyethylene, 4-6 parts of carbon black master batch, 1-3 parts of appearance improver and 4-10 parts of environmental stress cracking resistance regulator. The special material for the buried polyethylene structure wall pipeline is prepared from four kinds of polyethylene with different grades, namely pipe grade polyethylene, hollow grade polyethylene, injection grade polyethylene and film grade linear polyethylene, so that the regenerated buried polyethylene structure wall pipeline with excellent mechanical property and appearance property can be prepared. The invention also discloses a preparation method of the special material for the buried polyethylene structural wall pipeline, and the special material for the buried polyethylene structural wall pipeline with uniform performance can be prepared by adopting the method.
Description
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a special material for buried polyethylene structure wall pipelines and a preparation method thereof.
Background
Among the various pipe production technologies, the High Density Polyethylene (HDPE) buried drain pipe has been developed most rapidly, and there are two main processes according to the existing production technology classification: direct extrusion molding and winding-welding molding, with the most widely used being structural tubes made by the direct extrusion molding process. The structural pipe is a plastic pipe which takes HDPE as a main raw material, is formed by an inner extruder and an outer extruder in a co-extrusion one-step way respectively, has a flat inner wall and a trapezoidal corrugated outer wall, and has a wall-sandwiched hollow layer between the inner wall and the outer wall. The steel plate has the advantages of light weight, high pressure resistance, high ring stiffness, good toughness, low temperature resistance, corrosion resistance, fast construction, long service life and the like.
Buried polyethylene structural wall pipes as structural pipes have high requirements on strength, rigidity, service life and forming of materials, so that proper melt flow rate, high mechanical property, environmental stress cracking resistance and thermal-oxidative aging resistance are required. The national standard GB/T19472.1-2004 specifies buried polyethylene structural wall pipes in detail.
In order to prepare the special material for the buried polyethylene structure wall pipeline, which has the performance meeting the national standard, the special material is prepared by mixing and mixing the tubular polyethylene resin serving as a base material and a small amount of HDPE (high-density polyethylene) returned material, linear low-density polyethylene, reinforced master batch, carbon black, an antioxidant, a modifier and the like added into the base material, for example, the published patent CN 102494203A, all the used resins are novel polyethylene materials, while the reports and patents for producing the special material for the buried polyethylene structure wall pipeline by using waste polyethylene materials are few, and the patent with the publication number of CN 106832528A discloses a production method of a HDPE (high-density polyethylene) regenerated modified material, but the related waste plastics have no specific physical property requirements.
However, in the process of national technological progress and rapid economic development, waste polyethylene products are various in types and large in total amount. How to recycle these waste polyethylenes is not only one of the policy directions encouraged and advocated by the nation, but also one of the social responsibilities of plastics modification enterprises. According to long-term production experience, if all raw materials of the special material for the buried polyethylene structural wall pipeline are waste polyethylene materials, the extrusion defects such as pitted surfaces, bulges, bubbles and the like easily occur in the extrusion process, meanwhile, the quality of products is neglected by a plurality of manufacturers for producing plastic pipelines for reducing the cost by adding reclaimed materials, the knowledge on bottom materials, sources, physical properties and the like of the reclaimed materials is incomplete when the reclaimed materials are used for production, and the phenomena of insufficient ring stiffness, insufficient toughness, environmental stress cracking resistance and the like occur due to lack of experimental verification, so that the accidents such as engineering rework, error period and the like are caused. Therefore, a new technology for developing a special material for buried polyethylene structure wall pipelines, which takes waste polyethylene materials as raw materials, has the performance meeting national standards and has qualified extrusion appearance, is urgently needed.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a special material for buried polyethylene structural wall pipelines and a preparation method thereof.
In order to realize the purpose, the invention adopts the technical scheme that: the special material for the buried polyethylene structure wall pipeline comprises the following preparation raw materials in parts by weight: 10-40 parts of pipe grade polyethylene, 10-30 parts of hollow grade polyethylene, 3-10 parts of injection grade polyethylene, 20-45 parts of film grade linear polyethylene, 4-6 parts of carbon black master batch, 1-3 parts of appearance improver and 4-10 parts of environmental stress cracking resistance regulator.
The special material for the buried polyethylene structure wall pipeline selects four polyethylenes with different grades, and the regenerated buried polyethylene structure wall pipeline with excellent mechanical property and appearance property can be prepared according to the mixture ratio.
Preferably, the pipe grade polyethylene, the hollow grade polyethylene, the injection-molding grade polyethylene and the film grade linear polyethylene are all recycled resins. The raw materials of the pipe-grade polyethylene, the hollow-grade polyethylene, the injection-grade polyethylene and the film-grade linear polyethylene can be new resin, can also be recycled resin, can also be a mixture of the new resin and the recycled resin, and preferably adopt the recycled resin, so that the cost can be greatly reduced.
The pipe-grade polyethylene recovered waste material mainly refers to a crushed material obtained by crushing a high-density polyethylene pipeline, such as a gas pipe, a high-density polyethylene corrugated pipe, a drip irrigation pipe, an anticorrosive coating of a buried steel pipeline, a polyethylene barrel with the volume of more than 100L and the like. The source of the material is pure, the performance is excellent, and the material has higher environmental stress cracking resistance.
The hollow-grade polyethylene recycled waste mainly refers to a crushed material obtained by crushing a high-density polyethylene hollow product, such as a polyethylene hollow barrel with the volume of less than 100L, a polyethylene feeding bottle, a Japanese-miscellaneous polyethylene bottle and the like. It has better mechanical property and contains very little PP miscellaneous material.
The injection molding grade polyethylene recycled waste is mainly formed by crushing a high-density polyethylene bottle cap or other injection molding parts (such as a beer frame, a turnover basket and the like), and has the advantages of less impurities, better particle glossiness and excellent performance.
The film grade linear polyethylene recovered waste material is mainly a kind of film type regenerated granulating material using LLDPE as main body. Since LLDPE has much higher tensile properties than LDPE, the bulk resin of such films can be judged by testing its tensile properties.
Preferably, the special material for the buried polyethylene structural wall pipeline comprises the following preparation raw materials in parts by weight: 15-30 parts of pipe grade polyethylene, 10-20 parts of hollow grade polyethylene, 5-8 parts of injection grade polyethylene, 20-40 parts of film grade linear polyethylene, 4-6 parts of carbon black master batch, 1-3 parts of appearance improver and 5-8 parts of environmental stress cracking resistance regulator.
Preferably, the melt flow rate of the pipe grade polyethylene is 0.1-0.5 g/10min, measured according to GB/T3682 using a weight of 5kg at 190 ℃.
Preferably, the melt flow rate of the hollow-grade polyethylene is 0.5-2.0 g/10min, measured according to GB/T3682 using a weight of 5kg and at 190 ℃.
Preferably, the injection grade polyethylene has a melt flow rate of 0.5 to 2.0g/10min, measured according to GB/T3682 using a weight of 2.16kg and at 190 ℃.
Preferably, the film grade linear polyethylene has a melt flow rate of 2.0 to 4.0g/10min, measured according to GB/T3682 using a weight of 2.16kg and at 190 ℃.
Preferably, the density of the pipe-grade polyethylene is 0.95-0.97 g/cm 3 According to GB/T1040.2, an extrusion molding 1BA type sample strip, the thickness of the sample strip is 2mm, and the tensile speed is 50mm/min is adopted for carrying out tensile property test: the tensile strength is more than 25MPa, and the elongation is more than 600 percent.
Preferably, the density of the hollow-grade polyethylene is 0.95-0.97 g/cm 3 According to GB/T1040.2, an extrusion molding 1BA type sample strip, the thickness of the sample strip is 2mm, and the tensile speed is 50mm/min is adopted for carrying out tensile property test: the tensile strength is more than 22MPa, and the elongation is more than 350 percent.
Preferably, the density of the injection molding grade polyethylene is 0.95-0.97 g/cm 3 Tensile properties were measured according to GB/T1040.2 moulding of 1A type bars, thickness 4mm, tensile speed 50 mm/min: the tensile strength is more than 20MPa, and the elongation is more than 50 percent; the flexural modulus tested according to GB/T9341-.
Preferably, the density of the film-grade linear polyethylene is 0.915-0.955 g/cm 3 According to GB/T1040.2, an extrusion molding 1BA type sample strip, the thickness of the sample strip is 2mm, and the tensile speed is 50mm/min is adopted for carrying out tensile property test: the tensile strength is more than 22MPa, and the elongation is more than 500 percent.
The ash content of the pipe-grade polyethylene, the hollow-grade polyethylene, the injection-grade polyethylene and the film-grade linear polyethylene is less than 2%, and the ash content is burnt in a muffle furnace for 2 hours under the test condition of 650 +/-50 ℃.
Preferably, the carbon black master batch comprises the following components in parts by weight: 30-50 parts of film-grade linear polyethylene, 40-45 parts of carbon black, 15-20 parts of antioxidant, 1-3 parts of dispersant and 1-3 parts of weather-resistant agent; the antioxidant is hindered phenol antioxidant and/or phosphite antioxidant, the dispersing agent is PE wax, and the weather-resistant agent is a mixture of an ultraviolet light absorber and a hindered amine light stabilizer.
The film-grade linear polyethylene can be new resin or recycled resin, preferably recycled resin, the melt flow rate of the film-grade linear polyethylene is 2.0-4.0 g/10min, the film-grade linear polyethylene has a density of 0.915-0.955 g/cm measured at 190 ℃ by using 2.16kg weight according to GB/T3682 3 The tensile strength was tested according to GB/T1040.2 using extruded 1 BA-type bars, thickness 2mm, tensile speed 50 mm/min: the tensile strength is more than 22MPa, and the elongation is more than 500 percent. In the carbon black masterbatch, the film-grade linear polyethylene is preferably pelletized.
Preferably, the appearance improving agent is PE-based calcium oxide master batch.
Preferably, the environmental stress crack resistance improver is an ethylene-butene polymer and/or an ethylene-octene polymer.
Preferably, the antioxidant is a mixture of hindered phenol antioxidant and phosphite antioxidant, and the weight ratio of the hindered phenol antioxidant to the phosphite antioxidant is 3: 2; and/or the weather resisting agent is an ultraviolet absorbent and the hindered amine light stabilizer with the weight ratio of 1: 1.
The invention also aims to provide a preparation method of the special material for the buried polyethylene structural wall pipeline, which comprises the following steps:
(1) mixing and granulating pipe-grade polyethylene, hollow-grade polyethylene and injection-grade polyethylene to obtain a crushed material;
(2) granulating the film-grade linear polyethylene to obtain film granulating materials;
(3) uniformly mixing the crushed material, the film granulating material, the carbon black master batch, the appearance improver and the environmental stress cracking resistance regulator, then putting the mixture into an upper-stage single-screw extruder, and flowing the mixture into a lower-stage extruder after melt extrusion for melt extrusion, water cooling, granulating, sieving and drying to obtain the special material for the buried polyethylene structural wall pipeline.
Because the density, the particle size and the size of the pipe-grade polyethylene, the hollow-grade polyethylene and the injection-grade polyethylene in the step (1) are greatly different from those of the film-grade linear polyethylene in the step (2), if the conventional one-pot mixing process is adopted, broken pieces and particles are layered, the uniformity is affected, and the performance of a finished product is fluctuated and even unqualified. Therefore, the uniformity of the performance of the finished product can be realized by respectively granulating the pipe-grade polyethylene, the hollow-grade polyethylene and the injection-grade polyethylene in the step (1) and the film-grade linear polyethylene in the step (2), mixing, and performing melt extrusion.
The special material for the buried polyethylene structure wall pipeline is produced by adopting a double-stage extruder set, an upper-stage single-screw extruder can effectively plasticize, remove impurities and naturally exhaust waste polyethylene crushed materials, a lower-stage extruder can improve the dispersibility and compatibility of all components by designing screw combination, and a vacuum system is arranged to further devolatilize, so that the special material for the buried polyethylene structure wall pipeline with high glossiness and no air holes in a tangent plane is prepared.
Preferably, the preparation method of the carbon black master batch comprises the following steps: uniformly mixing film-grade polyethylene, carbon black, an antioxidant, a dispersant and a weather-resistant agent in a high-speed mixer at a low rotation speed, and then putting the mixture into an internal mixer, wherein the internal mixing temperature is 160-175 ℃, and the internal mixing time is 10-15 minutes; and feeding the internally mixed material mass into a single-screw extruder through a conical twin-screw to carry out surface grinding and air cooling granulation, wherein the temperature of the single-screw extruder is 170-190 ℃.
Preferably, in the step (1), the extruder for granulation is a single-screw melt extrusion granulator, the temperature of each temperature zone is 160-200 ℃, the temperature of a screen changer and a machine head of the single screw is 200-210 ℃, and the mesh number of the screen changer is 60+80 meshes.
Preferably, in step (3), the mixing is carried out using an apparatus having a volume of more than 5m 3 The vertical mixer or the horizontal mixer is used for improving the mixing uniformity.
Preferably, in the step (3), the single-screw extruder at the upper stage has at least one vent, and the conveying section of the single screw adopts a deep screw groove design to improve the feeding amount; the melting compression section adopts a separation type screw design to realize solid-liquid separation and improve plasticizing capacity, and then a chute barrier section (with the length of 1-2D) is arranged at a position close to the exhaust section to increase melting and mixing effects; the exhaust section adopts a deep spiral groove design in order to improve the devolatilization efficiency; deeper flights and shorter leads are provided in the metering section to increase the annular mixing effect of the melt.
Preferably, the temperatures of the sections of the single-screw extruder are: the solid conveying section is 180 ℃, the melt compression section is 220-240 ℃, the exhaust section is 225 ℃, the homogenization section is 215-225 ℃, the filter plate is 220 ℃ and the discharge pipe is 220 ℃;
in the step (3), the lower-stage extruder is a single-screw extruder or a double-screw extruder, and if the lower-stage extruder is a single screw, the screw structure of the lower-stage extruder is preferably a structure with a deeper screw and a shorter lead so as to improve the annular mixing effect of the melt; if the double screw is adopted, the screw combination improves the dispersion and compatibility of each component by designing a multi-section 45-degree meshing area. And vacuum pumping equipment is additionally arranged at the exhaust port, the vacuum degree is-0.08 MPa, the temperature of each temperature zone is 190-200 ℃, and the temperature of the die head is 210 ℃.
The invention has the beneficial effects that: the invention provides a special material for buried polyethylene structural wall pipelines and a preparation method thereof. The special material for the buried polyethylene structure wall pipeline is selected from four different grades of polyethylene, namely pipe grade polyethylene, hollow grade polyethylene, injection grade polyethylene and film grade linear polyethylene, so that the regenerated buried polyethylene structure wall pipeline with excellent mechanical property and appearance property can be prepared.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples.
Examples and comparative examples the raw material formulations for the preparation of the special material for buried polyethylene structural wall pipelines are shown in tables 2 and 3.
In the examples and comparative examples, the pipe-grade polyethylene crushed material, the hollow-grade polyethylene crushed material and the injection-grade polyethylene crushed material are all recycled resin, and are obtained by sorting, crushing, cleaning and dehydrating, and the film-grade linear polyethylene granulation material is obtained by sorting, crushing, cleaning and dehydrating recycled linear polyethylene films.
The pipe grade polyethylene crushed material is selected from polyethylene materials with the following characteristics: a melt flow rate of 0.1 to 0.5g/10min (measured at 190 ℃ using a weight of 5kg according to GB/T3682), and a density of 0.95 to 0.97g/cm 3 According to GB/T1040.2, an extrusion molding 1BA type sample strip, the thickness of the sample strip is 2mm, and the tensile speed is 50mm/min is adopted for carrying out tensile property test: the tensile strength is more than 25MPa, and the elongation is more than 600 percent.
The hollow-grade polyethylene is selected from polyethylene materials with the following characteristics: a melt flow rate of 0.5 to 2.0g/10min (measured at 190 ℃ using a weight of 5kg according to GB/T3682), and a density of 0.95 to 0.97g/cm 3 According to GB/T1040.2, an extrusion molding 1BA type sample strip, the thickness of the sample strip is 2mm, and the tensile speed is 50mm/min is adopted for carrying out tensile property test: the tensile strength is more than 22MPa, and the elongation is more than 350 percent.
The injection molding grade polyethylenes are all selected from polyethylene materials having the following characteristics: a melt flow rate of 0.5 to 2.0g/10min (measured at 190 ℃ using a weight of 2.16kg according to GB/T3682) and a density of 0.95 to 0.97g/cm 3 Tensile properties were measured according to GB/T1040.2 moulding of 1A-type bars at a tensile speed of 50 mm/min: the tensile strength is more than 20MPa, and the elongation is more than 50 percent; the flexural modulus tested according to GB/T9341-.
The film grade linear polyethylenes are all selected from polyethylene materials having the following characteristics: a melt flow rate of 2.0 to 4.0g/10min (measured at 190 ℃ using a weight of 2.16kg according to GB/T3682), and a density of 0.915 to 0.955g/cm 3 According to GB/T1040.2, an extrusion molding 1BA type sample strip, the thickness of the sample strip is 2mm, and the tensile speed is 50mm/min is adopted for carrying out tensile property test: the tensile strength is more than 22MPa, and the elongation is more than 500 percent.
The carbon black master batch comprises the following components in parts by weight: 40 parts of film-grade linear polyethylene, 43 parts of carbon black, 18 parts of antioxidant, 2 parts of dispersant and 2 parts of weather-resistant agent; the film-grade linear polyethylenes are each selected from the group consisting of poly(s) having the following characteristicsEthylene material: a melt flow rate of 2.0 to 4.0g/10min (measured at 190 ℃ using a weight of 2.16kg according to GB/T3682) and a density of 0.915 to 0.955g/cm 3 According to GB/T1040.2, a 1BA type sample strip is extruded, the thickness is 2mm, and the tensile speed is 50mm/min to carry out tensile property test: the tensile strength is more than 22MPa, and the elongation is more than 500 percent.
The preparation method of the carbon black master batch comprises the following steps: uniformly mixing film-grade polyethylene, carbon black, an antioxidant, a dispersant and a weather-resistant agent in a high-speed mixer at a low rotation speed, and then putting the mixture into an internal mixer, wherein the internal mixing temperature is 160-175 ℃, and the internal mixing time is 10-15 minutes; and feeding the internally mixed material groups into a single-screw extruder through a conical double-screw extruder for surface grinding and air cooling granulation, wherein the temperature of the single-screw extruder is 170-190 ℃. The antioxidant is a mixture of hindered phenol antioxidant and phosphite antioxidant, the weight ratio of the hindered phenol antioxidant to the phosphite antioxidant is 3:2, the dispersing agent is PE wax, the weather-resistant agent is a mixture of ultraviolet light absorber and hindered amine light stabilizer, and the weight ratio of the ultraviolet light absorber to the hindered amine light stabilizer is 1: 1. Wherein the hindered phenol antioxidant is purchased from New Tianjin Lianlong Material Co., Ltd, and has a model of RIANOX 1010; the phosphite antioxidant is purchased from New Tianjin Lianlong Material Co., Ltd, and is available in the type of RIAOX 168; the PE wax is purchased from Guangzhou Hengshi import and export trade company, and has the model of CS-12N; the ultraviolet light absorber is purchased from Cyanote engineering materials (Shanghai) Co., Ltd, and has the model of UV-531; hindered amine light stabilizers were purchased from Aidic investment Inc. and are model LA-402 AF.
The appearance improver is PE-based calcium oxide master batch which is purchased from Guangzhou Luxin environmental protection science and technology limited company and has the product model of NDM-1008.
The environmental stress cracking resistance improver is ethylene-butylene polymer and/or ethylene-octene polymer, which is available from Nippon wave energy optical new materials science and technology Co., Ltd, and has a product model of MC 218.
The preparation method of the special material for the buried polyethylene structure wall pipeline comprises the following steps:
(1) cleaning and dehydrating a pipe-grade polyethylene crushed material, a hollow-grade polyethylene crushed material and an injection-grade polyethylene crushed material, bagging for later use, sorting, crushing, cleaning and dehydrating a low-density polyethylene film, and then performing melt extrusion granulation for later use by a single-screw extruder, wherein the temperature of each temperature zone of the single-screw melt extrusion granulation is 160-200 ℃, the temperature of a screen changer and a machine head of the single screw is 200-210 ℃, and the mesh number of a screen of the screen changer is 60+80 meshes;
(2) weighing the processed pipe-grade polyethylene crushed material, the hollow-grade polyethylene crushed material and the injection-grade polyethylene crushed material according to the proportion of the formula, wherein the input volume is 5m 3 After being mixed for 30min, the materials are put into a bin of a vibration blanking metering scale; weighing film-grade polyethylene granulating material, special functional carbon black master batch, appearance improver and environmental stress cracking resistance improver according to a formula proportion, wherein the input volume is 2m 3 The horizontal mixing tank is mixed for 20min and then put into a storage bin of another weighing scale (which can be a vibration blanking weighing scale or a screw blanking weighing scale). The blanking proportion or the weight of the two metering scales is set according to the formula proportion, and the materials can be accurately blanked into a blanking port of the upper-stage single-screw extruder according to the proportion;
(3) the material enters an upper-stage single-screw extruder and undergoes four processes of solid conveying, melting plasticization, melting mixing and melt impurity removal and filtration, wherein the extrusion temperature is 180-230 ℃, and the number of filter screens on a filter plate is 80+100 meshes; and (3) enabling the melt after impurity removal to flow into a feed opening of a lower-stage single-screw or double-screw extruder, granulating at the temperature of 170-200 ℃, carrying out hot cutting on a water bracing strip or an underwater ground surface in a grain cutting mode, and then sieving, drying on line and packaging to obtain the special material for the buried polyethylene structure wall pipeline.
The performance test methods of the examples and comparative examples are shown in table 1:
TABLE 1
The test results are shown in tables 2 and 3.
TABLE 2
TABLE 3
As can be seen from tables 2 and 3, the special material for the buried polyethylene structure wall pipeline in the embodiments 1 to 7 has the special material index meeting GB/T19472.1-2004.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (3)
1. The special material for the buried polyethylene structure wall pipeline is characterized by comprising the following preparation raw materials in parts by weight: 10-40 parts of pipe grade polyethylene, 10-30 parts of hollow grade polyethylene, 3-10 parts of injection grade polyethylene, 20-45 parts of film grade linear polyethylene, 4-6 parts of carbon black master batch, 1-3 parts of appearance improver and 4-10 parts of environmental stress cracking resistance regulator;
the melt flow rate of the pipe grade polyethylene is 0.1-0.5 g/10min, the melt flow rate of the pipe grade polyethylene is measured at 190 ℃ according to GB/T3682 with the weight of 5kg, and the density of the pipe grade polyethylene is 0.95-0.97 g/cm 3 According to GB/T1040.2, an extrusion molding 1BA type sample strip, the thickness of the sample strip is 2mm, and the tensile speed is 50mm/min is adopted for carrying out tensile property test: the tensile strength is more than 25MPa, and the elongation is more than 600 percent;
the melt flow rate of the hollow-grade polyethylene is 0.5-2.0 g/10min, and the hollow-grade polyethyleneThe melt flow rate of the ethylene is measured according to GB/T3682 using a weight of 5kg and at 190 ℃, and the density of the hollow-grade polyethylene is 0.95-0.97 g/cm 3 According to GB/T1040.2, an extrusion molding 1BA type sample strip, the thickness of the sample strip is 2mm, and the tensile speed is 50mm/min is adopted for carrying out tensile property test: the tensile strength is more than 22MPa, and the elongation is more than 350 percent;
the melt flow rate of the injection-grade polyethylene is 0.5-2.0 g/10min, the melt flow rate of the injection-grade polyethylene is measured at 190 ℃ by using 2.16kg of weight according to GB/T3682, and the density of the injection-grade polyethylene is 0.95-0.97 g/cm 3 Tensile properties were measured according to GB/T1040.2 moulding of 1A type bars, thickness 4mm, tensile speed 50 mm/min: the tensile strength is more than 20MPa, and the elongation is more than 50 percent; the flexural modulus tested according to GB/T9341-2008 is more than 750 MPa;
the melt flow rate of the film-grade linear polyethylene is 2.0-4.0 g/10min, the film-grade linear polyethylene is measured at 190 ℃ according to GB/T3682 with a weight of 2.16kg, and the density of the film-grade linear polyethylene is 0.915-0.955 g/cm 3 According to GB/T1040.2, an extrusion molding 1BA type sample strip, the thickness of the sample strip is 2mm, and the tensile speed is 50mm/min is adopted for carrying out tensile property test: the tensile strength is more than 22MPa, and the elongation is more than 500 percent;
the carbon black master batch comprises the following components in parts by weight: 30-50 parts of film-grade linear polyethylene, 40-45 parts of carbon black, 15-20 parts of antioxidant, 1-3 parts of dispersant and 1-3 parts of weather resistant agent; the antioxidant is hindered phenol antioxidant and/or phosphite antioxidant, the dispersing agent is PE wax, and the weather-resistant agent is a mixture of an ultraviolet light absorber and a hindered amine light stabilizer;
the appearance improver is PE-based calcium oxide master batch;
the environmental stress cracking resistance improver is an ethylene-butene high polymer and/or an ethylene-octene high polymer.
2. The special material for the buried polyethylene structure wall pipeline as claimed in claim 1, wherein the antioxidant is a mixture of hindered phenol antioxidant and phosphite antioxidant, and the weight ratio of the hindered phenol antioxidant to the phosphite antioxidant is 3: 2; and/or the weather resisting agent is an ultraviolet absorbent and the hindered amine light stabilizer with the weight ratio of 1: 1.
3. The method for preparing the special material for the buried polyethylene structure wall pipeline as claimed in claim 1 or 2, is characterized by comprising the following steps:
(1) mixing and granulating the pipe-grade polyethylene, the hollow-grade polyethylene and the injection-grade polyethylene to obtain a crushed material;
(2) granulating the film-grade linear polyethylene to obtain film granulating materials;
(3) uniformly mixing the crushed material, the film granulating material, the carbon black master batch, the appearance improver and the environmental stress cracking resistance regulator, then putting the mixture into an upper-stage single-screw extruder, and flowing the mixture into a lower-stage extruder after melt extrusion for melt extrusion, water cooling, granulating, sieving and drying to obtain the special material for the buried polyethylene structural wall pipeline.
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