CN108676243B - Hybrid material, graphene modified heat-resistant PE-RT pipe and preparation method thereof - Google Patents
Hybrid material, graphene modified heat-resistant PE-RT pipe and preparation method thereof Download PDFInfo
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Abstract
The invention provides a hybrid material, a graphene modified heat-resistant PE-RT pipe and a preparation method thereof, wherein the preparation method of the hybrid material comprises the following steps of uniformly mixing a graphene oxide dispersion liquid and a plant polyphenol solution, then adding layered silicate, fully stirring, heating to 50-90 ℃, and reacting for 6-15 h; the mass ratio of the graphene oxide to the plant polyphenol to the layered silicate is 1: (0.5-1): (0.1 to 1). The heat-resistant PE-RT pipe with excellent mechanical property, high-temperature creep resistance, heat aging resistance and extrusion processability is prepared from the components such as heat-resistant polyethylene and an antioxidant, the production process is simple, the heat-resistant PE-RT pipe is suitable for industrial production, and the heat-resistant PE-RT pipe can be widely used for preparing pipes and pipe fittings for hot water pipeline systems.
Description
Technical Field
The invention belongs to the technical field of PE-RT pipes, and particularly relates to a hybrid material, a graphene modified heat-resistant PE-RT pipe and a preparation method thereof.
Background
The heat-resistant polyethylene (PE-RT) pipe not only has the properties of common polyethylene pipes, such as weldability, recyclability, forming processing, convenient construction and the like, but also has long-term heat resistance close to that of a cross-linked polyethylene pipe, and simultaneously has unique flexibility, thereby being an energy-saving and environment-friendly plastic pipe. The improvement of heat resistance and aging performance is always the key and difficult point of the research of PE-RT pipes.
Graphene is a novel two-dimensional carbon material with the characteristics of super-strong mechanical strength, high thermal conductivity, high light transmittance, high specific surface area and the like, and due to the excellent characteristics, the graphene has a wide application prospect in the fields of high-performance electronic devices, composite materials, gas sensors, energy storage and the like, and particularly, the graphene is considered to be an excellent heat conduction material due to the super-high thermal conductivity. However, the surface of graphene is in an inert state, the interaction between graphene and a polymer is weak, and aggregation easily occurs between each two sheets due to strong van der waals force, which causes that graphene is difficult to disperse in the polymer and causes great difficulty in application of graphene in the polymer. Therefore, improving the interaction between graphene and a polymer and improving the dispersion of graphene in the polymer are the key points for preparing the high-performance graphene/polymer nanocomposite.
Disclosure of Invention
In view of the above, the invention aims to provide a hybrid material, a graphene modified heat-resistant PE-RT pipe and a preparation method thereof, so as to overcome the defects in the prior art and improve the processing, mechanical, heat-resistant and aging-resistant performances of the PE-RT pipe composite material. The invention realizes the ordered aggregation and assembly of the graphene and the phyllosilicate by using a simple method, and realizes the uniform dispersion of the graphene in a polymer matrix.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a graphene layered silicate hybrid material is prepared by the following steps of uniformly mixing a graphene oxide dispersion liquid and a plant polyphenol solution, then adding layered silicate, fully stirring, heating to 50-90 ℃, and reacting for 6-15 hours; the mass ratio of the graphene oxide to the plant polyphenol to the layered silicate is 1: (0.5-1): (0.1 to 1); preferably, the reaction is carried out for 8-10 h by heating to 60-80 ℃.
Preferably, the plant polyphenol comprises one or more of catechol, ferulic acid, catechin, gallic acid and hydrolyzed tannin; the phyllosilicate is one or more of montmorillonite, hydrotalcite, hectorite, kaolin, smectite, illite, attapulgite, sepiolite, vermiculite and hydromica.
Preferably, the concentration of the graphene oxide dispersion liquid is 0.5-1.5 mg/mL; the concentration of the plant polyphenol solution is 0.5-1.5 mg/mL; preferably, the concentration of the graphene oxide dispersion liquid is 1 mg/mL; the concentration of the plant polyphenol solution is 1 mg/mL.
It is another object of the present invention to provide the use of the graphene phyllosilicate hybrid material as described above in pipes.
The invention also provides a graphene modified heat-resistant PE-RT tube containing the graphene layered silicate hybrid material, which is characterized in that: the graphene-layered silicate nano hybrid material comprises, by weight, 100 parts of PE-RT, 0.02-1 part of an antioxidant and 0.1-3 parts of a graphene-layered silicate nano hybrid material.
Preferably, the antioxidant is a mixture of hindered phenol antioxidant, phosphite antioxidant and thioester antioxidant, and the weight ratio of the hindered phenol antioxidant to the thioester antioxidant is 0.05-0.5: 0.1-0.5: 0.05 to 0.5.
Preferably, the hindered phenolic antioxidant is selected from the group consisting of pentaerythrityl tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], (2,4, 6-trioxo-1, 3, 5-triazine-1, 3,5(2H,4H,6H) -triyl) trivinyltris [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) acrylate ], 1, 3-tris (2-methyl-4-hydroxy-5-tert-butylphenyl) butane, 1,3, 5-trimethyl-2, 4, 6-tris (3, 5-di-tert-butyl-4-hydroxybenzyl) benzene, 1,3, 5-tris (4-tert-butyl-3-hydroxy-2, one, two or more than two of 6-dimethylbenzyl) -1,3, 5-triazine-2, 4,6- (1H,3H,5H) -trione and 1,3, 5-tri (3, 5-di-tert-butyl-4-hydroxybenzyl) s-triazine-2, 4,6- (1H,3H,5H) trione; the phosphite antioxidant is selected from one of tris (2, 4-di-tert-butylphenyl) phosphite or pentaerythritol diphosphite bis (2, 4-di-tert-butylphenyl) ester; the thioester antioxidant is dioctadecyl thiodipropionate or dilauryl thiodipropionate.
The invention also provides a method for preparing the graphene modified heat-resistant PE-RT pipe, which comprises the following steps,
1) adding an antioxidant, a graphene/phyllosilicate hybrid material and PE-RT into a high-speed mixer, stirring at a high speed for 10-30 min, discharging the materials, and adding the materials into a double-screw extruder for extrusion granulation; the rotation speed of the main screw is 100-300 r/min, the temperature of a first zone of the charging barrel is 170-200 ℃, the temperature of a second zone is 175-205 ℃, the temperature of a third zone is 180-210 ℃, the temperature of a fourth zone is 185-215 ℃, the temperature of a fifth zone is 180-210 ℃, and the temperature of a machine head is 175-205 ℃, so that the graphene modified heat-resistant PE-RT master batch is obtained;
2) adding the PE-RT and graphene modified heat-resistant PE-RT master batch into a high-speed mixer, stirring at a high speed for 5-10 min, discharging the materials, and adding into a single-screw extruder, wherein the rotating speed of a main screw is 300-500 r/min, the temperature of a first zone of a charging barrel is 170-200 ℃, the temperature of a second zone is 175-205 ℃, the temperature of a third zone is 180-210 ℃, the temperature of a fourth zone is 185-215 ℃, the temperature of a fifth zone is 180-210 ℃, and the temperature of a machine head is 175-205 ℃.
Preferably, in the step 1), the temperature of the first area of the charging barrel is 185 ℃, the temperature of the second area is 190 ℃, the temperature of the third area is 195 ℃, the temperature of the fourth area is 200 ℃, the temperature of the fifth area is 195 ℃, and the temperature of the machine head is 190 ℃;
in the step 2), the temperature of the first zone of the charging barrel is 185 ℃, the temperature of the second zone is 190 ℃, the temperature of the third zone is 195 ℃, the temperature of the fourth zone is 200 ℃, the temperature of the fifth zone is 195 ℃ and the temperature of the machine head is 190 ℃.
Compared with the prior art, the hybrid material, the graphene modified heat-resistant PE-RT pipe and the preparation method thereof have the following advantages:
(1) according to the invention, the hybrid compounding of graphene and nano layered silicate is realized by using a layer-by-layer self-assembly method, and the co-stripping and the synergistic dispersion of graphene and nano layered silicate are realized. The graphene/phyllosilicate nano hybrid material prepared by the method has low production cost, simple required equipment and high yield, and is easy to realize industrial production; the graphene layered silicate nano hybrid material can be used for preparing cold and hot water pipelines in buildings, and comprises industrial or civil cold and hot water, drinking water and heating system pipelines.
(2) The heat-resistant PE-RT pipe is modified by graphene to obtain the graphene modified PE-RT pipe, the PE-RT pipe has excellent long-term hydrostatic pressure resistance and high temperature resistance, and excellent impact resistance, flexibility and thermal conductivity, and the prepared PE-RT pipe can be used for preparing cold and hot water pipelines in buildings.
(3) The graphene layered silicate nano hybrid material and the PE-RT pipe have the advantages of fewer raw materials, simple preparation process and easily obtained raw materials, and are suitable for industrial production.
Detailed Description
Unless defined otherwise, technical terms used in the following examples have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention belongs. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods are conventional methods unless otherwise specified.
The present invention will be described in detail with reference to examples.
Example 1
(1) Graphene oxide was prepared by Hummers method. Specific references are: hummers Jr, w.s.; offeman, R.E.J Am Chem Soc 1958,80, 1339.
Graphene oxide was dispersed in water to prepare a 1mg/mL dispersion. Catechin was dissolved in water to prepare a 1mg/mL solution. And uniformly mixing the two solutions according to the volume ratio of 1:1, adding montmorillonite into the solution, wherein the adding amount is the same as the mass of graphene oxide in the solution, fully stirring, heating to 80 ℃, reacting for 8 hours, washing the obtained product to be neutral after the reaction is finished, and drying to obtain the graphene/montmorillonite nano hybrid material.
(2) Graphene modified heat-resistant PE-RT master batch: adding the graphene/montmorillonite nano hybrid material, 1, 3-tris (2-methyl-4-hydroxy-5-tert-butylphenyl) butane (hindered phenol antioxidant), 1,3, 5-trimethyl-2, 4, 6-tris (3, 5-di-tert-butyl-4-hydroxybenzyl) benzene (hindered phenol antioxidant), tris (2, 4-di-tert-butylphenyl) phosphite (phosphite antioxidant), bis (octadecyl thiodipropionate (thioester antioxidant) and PE-RT into a high-speed mixer according to the following weight ratio of 5:0.05:0.05:0.1:0.05:100, stirring at a high speed for 10min, discharging the material, adding the discharged material into a double-screw extruder for extrusion granulation, wherein the rotation speed of a main screw is 250r/min, the temperature of a first zone is 185 ℃, the temperature of the second zone is 190 ℃, the temperature of the third zone is 195 ℃, the temperature of the fourth zone is 200 ℃, the temperature of the fifth zone is 195 ℃ and the temperature of the machine head is 190 ℃.
Preparing a graphene modified heat-resistant PE-RT pipe: adding the graphene modified heat-resistant PE-RT master batch and the PE-RT into a high-speed mixer according to the following weight ratio of 1:10, stirring at a high speed for 15min at 45 ℃, discharging the materials, adding the materials into a single-screw extruder, wherein the rotating speed of a main screw is 450r/min, the temperature of a first area of a charging barrel is 185 ℃, the temperature of a second area is 190 ℃, the temperature of a third area is 195 ℃, the temperature of a fourth area is 200 ℃, the temperature of a fifth area is 195 ℃ and the temperature of a machine head is 190 ℃.
Example 2
(1) Graphene oxide was prepared by Hummers method. Specific references are: hummers Jr, w.s.; offeman, R.E.J Am Chem Soc 1958,80, 1339.
Graphene oxide was dispersed in water to prepare a 1mg/mL dispersion. Dissolving gallic acid in water to obtain 1mg/mL solution. Uniformly mixing the two solutions according to the volume ratio of 1:1, adding hectorite into the solution, wherein the adding amount is the same as the mass of graphene oxide in the solution, fully stirring, heating to 60 ℃, reacting for 10 hours, washing the obtained product to be neutral after the reaction is finished, and drying to obtain the graphene/hectorite nano hybrid material.
(2) Graphene modified heat-resistant PE-RT master batch: adding the graphene/hectorite nano hybrid material, 1,3, 5-tris (4-tert-butyl-3-hydroxy-2, 6-dimethylbenzyl) -1,3, 5-triazine-2, 4,6- (1H,3H,5H) -trione (hindered phenol antioxidant), pentaerythritol bis (2, 4-ditert-butylphenyl) phosphite (phosphite antioxidant), bis (octadecyl) thiodipropionate (thioester antioxidant) and PE-RT into a high-speed mixer according to the following weight ratio of 5:0.2:0.05:0.05:100, stirring at a high speed for 30min, discharging the material, and adding into a double-screw extruder for extrusion granulation; the rotation speed of the main screw is 200r/min, the temperature of a first zone of the charging barrel is 185 ℃, the temperature of a second zone is 190 ℃, the temperature of a third zone is 195 ℃, the temperature of a fourth zone is 200 ℃, the temperature of a fifth zone is 195 ℃, and the temperature of a machine head is 190 ℃.
Preparing a graphene modified heat-resistant PE-RT pipe: adding the graphene modified heat-resistant PE-RT master batch and the PE-RT into a high-speed mixer according to the weight ratio of 1:10, stirring at a high speed for 5min, discharging the materials, and adding into a single-screw extruder at the main screw rotation speed of 500r/min, wherein the temperature of a first area of a charging barrel is 185 ℃, the temperature of a second area is 190 ℃, the temperature of a third area is 195 ℃, the temperature of a fourth area is 200 ℃, the temperature of a fifth area is 195 ℃ and the temperature of a machine head is 190 ℃.
Example 3
(1) Graphene oxide was prepared by Hummers method. Specific references are: hummers Jr, w.s.; offeman, R.E.J Am Chem Soc 1958,80, 1339.
Graphene oxide was dispersed in water to prepare a 1mg/mL dispersion. The hydrolyzed tannin was dissolved in water to prepare a 1mg/mL solution. And (2) uniformly mixing the two solutions according to a volume ratio of 2:1, adding hydrotalcite into the solution, wherein the adding amount is the same as the mass of graphene oxide in the solution, fully stirring, heating to 80 ℃, reacting for 8 hours, washing the obtained product to be neutral after the reaction is finished, and drying to obtain the graphene/hydrotalcite nano hybrid material.
(2) Graphene modified heat-resistant PE-RT master batch: adding the graphene/hydrotalcite nano hybrid material, 1,3, 5-tris (3, 5-di-tert-butyl-4-hydroxybenzyl) s-triazine-2, 4,6- (1H,3H,5H) trione (hindered phenol antioxidant), pentaerythritol bis (2, 4-di-tert-butylphenyl) phosphite (phosphite antioxidant), dilauryl thiodipropionate (thioester antioxidant) and PE-RT into a high-speed mixer according to the following weight ratio of 5:0.05:0.15:0.05:100, stirring at high speed for 5min, discharging the material, and adding the material into a double-screw extruder for extrusion granulation; the rotation speed of the main screw is 200r/min, the temperature of a first zone of the charging barrel is 185 ℃, the temperature of a second zone is 190 ℃, the temperature of a third zone is 195 ℃, the temperature of a fourth zone is 200 ℃, the temperature of a fifth zone is 195 ℃, and the temperature of a machine head is 190 ℃.
Preparing a graphene modified heat-resistant PE-RT pipe: adding the graphene modified heat-resistant PE-RT master batch and the PE-RT into a high-speed mixer according to the weight ratio of 1:10, stirring at a high speed for 30min at the temperature of 30 ℃, discharging the materials, adding the materials into a single-screw extruder, wherein the rotating speed of a main screw is 400r/min, the temperature of a first area of a charging barrel is 185 ℃, the temperature of a second area is 190 ℃, the temperature of a third area is 195 ℃, the temperature of a fourth area is 200 ℃, the temperature of a fifth area is 195 ℃ and the temperature of a machine head is 190 ℃.
Example 4
(1) Graphene oxide was prepared by Hummers method. Specific references are: hummers Jr, w.s.; offeman, R.E.J Am Chem Soc 1958,80, 1339.
Graphene oxide was dispersed in water to prepare a 1mg/mL dispersion. Catechin was dissolved in water to prepare a 1mg/mL solution. And (2) uniformly mixing the two solutions according to the volume ratio of 2:1, adding 0.1g of montmorillonite into the solution, wherein the adding amount is the same as the mass of graphene oxide in the solution, fully stirring, heating to 60 ℃, reacting for 10 hours, washing the obtained product to be neutral after the reaction is finished, and drying to obtain the graphene/montmorillonite nano hybrid material.
(2) Graphene modified heat-resistant PE-RT master batch: adding the graphene/phyllosilicate nano hybrid material, tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester (hindered phenol antioxidant), 1, 3-tri (2-methyl-4-hydroxy-5-tert-butylphenyl) butane (hindered phenol antioxidant), pentaerythritol bis (2, 4-di-tert-butylphenyl) phosphite (phosphite antioxidant), dilauryl thiodipropionate (thioester antioxidant) and PE-RT into a high-speed mixer according to the following weight ratio of 5:0.1:0.1:0.1:0.05:100, stirring at a high speed for 20min, discharging the material, and adding into a double-screw extruder for extrusion granulation; the rotation speed of the main screw is 200r/min, the temperature of a first zone of the charging barrel is 185 ℃, the temperature of a second zone is 190 ℃, the temperature of a third zone is 195 ℃, the temperature of a fourth zone is 200 ℃, the temperature of a fifth zone is 195 ℃, and the temperature of a machine head is 190 ℃.
Preparing a graphene modified heat-resistant PE-RT pipe: adding the graphene modified heat-resistant PE-RT master batch and the PE-RT into a high-speed mixer according to the weight ratio of 1:5, stirring at a high speed for 5min at 50 ℃, discharging the materials, adding into a single-screw extruder, wherein the rotation speed of a main screw is 400r/min, the temperature of a first area of a charging barrel is 185 ℃, the temperature of a second area is 190 ℃, the temperature of a third area is 195 ℃, the temperature of a fourth area is 200 ℃, the temperature of a fifth area is 195 ℃ and the temperature of a machine head is 190 ℃.
Example 5
(1) Graphene oxide was prepared by Hummers method. Specific references are: hummers Jr, w.s.; offeman, R.E.J Am Chem Soc 1958,80, 1339.
Graphene oxide was dispersed in water to prepare a 1mg/mL dispersion. Dissolving gallic acid in water to obtain 1mg/mL solution. And uniformly mixing the two solutions according to the volume ratio of 1:1, adding montmorillonite into the solution, wherein the adding amount is the same as the mass of graphene oxide in the solution, fully stirring, heating to 80 ℃, reacting for 8 hours, washing the obtained product to be neutral after the reaction is finished, and drying to obtain the graphene/montmorillonite nano hybrid material.
(2) Graphene modified heat-resistant PE-RT master batch: adding 40 parts of the graphene/montmorillonite nano hybrid material, 0.05 part of 1,3, 5-trimethyl-2, 4, 6-tri (3, 5-di-tert-butyl-4-hydroxybenzyl) benzene (hindered phenol antioxidant), 0.2 part of pentaerythritol bis (2, 4-di-tert-butylphenyl) phosphite (phosphite antioxidant), 0.05 part of dilauryl thiodipropionate (thioester antioxidant) and 100 parts of PE-RT into a high-speed mixer, stirring at a high speed for 5min, discharging the materials, and adding the materials into a double-screw extruder for extrusion granulation; the rotation speed of the main screw is 200r/min, the temperature of a first zone of the charging barrel is 185 ℃, the temperature of a second zone is 190 ℃, the temperature of a third zone is 195 ℃, the temperature of a fourth zone is 200 ℃, the temperature of a fifth zone is 195 ℃, and the temperature of a machine head is 190 ℃.
Preparing a graphene modified heat-resistant PE-RT pipe: adding the graphene modified heat-resistant PE-RT master batch and the PE-RT into a high-speed mixer according to the weight ratio of 3:10, stirring at a high speed for 10min, discharging the materials, and adding into a single-screw extruder at the main screw rotation speed of 400r/min, wherein the temperature of a first area of a charging barrel is 185 ℃, the temperature of a second area is 190 ℃, the temperature of a third area is 195 ℃, the temperature of a fourth area is 200 ℃, the temperature of a fifth area is 195 ℃ and the temperature of a machine head is 190 ℃.
And (3) carrying out performance measurement on the graphene modified heat-resistant PE-RT pipe according to GB/T28799.1-2012, wherein the test results are shown in Table 1.
Comparative example 1
Preparing a modified heat-resistant PE-RT pipe: adding PE-RT, tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester (hindered phenol antioxidant), tri (2, 4-di-tert-butylphenyl) phosphite (phosphite antioxidant) and bis (octadecyl) thiodipropionate (thioester antioxidant) into a single-screw extruder according to the weight ratio of 100:0.1:0.1:0.1, wherein the rotation speed of a main screw is 300r/min, the temperature of a first material cylinder region is 185 ℃, the temperature of a second region is 190 ℃, the temperature of a third region is 195 ℃, the temperature of a fourth region is 200 ℃, the temperature of a fifth region is 195 ℃ and the temperature of a machine head is 190 ℃.
Comparative example 2
(1) Graphene oxide was prepared by Hummers method. Specific references are: hummers Jr, w.s.; offeman, R.E.J Am Chem Soc 1958,80, 1339.
Graphene oxide was dispersed in water to prepare a 1mg/mL dispersion. Catechol was dissolved in water to prepare a 1mg/mL solution. And uniformly mixing the two solutions according to the volume ratio of 1:1, fully stirring, heating to 80 ℃, reacting for 8 hours, washing the obtained product to be neutral after the reaction is finished, and drying to obtain the graphene.
(2) Graphene modified heat-resistant PE-RT master batch: adding (2,4, 6-trioxo-1, 3, 5-triazine-1, 3,5(2H,4H,6H) -triyl) trivinyl tri [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) acrylate ] (hindered phenol antioxidant), tri (2, 4-di-tert-butylphenyl) phosphite (phosphite antioxidant), bis (octadecyl thiodipropionate (thioester antioxidant), graphene and PE-RT into a high-speed mixer according to the weight ratio of 0.1:0.1:0.1:5:100, stirring at a high speed for 20min, discharging the materials, adding into a double-screw extruder, and carrying out extrusion granulation; the rotation speed of the main screw is 200r/min, the temperature of a first zone of the charging barrel is 185 ℃, the temperature of a second zone is 190 ℃, the temperature of a third zone is 195 ℃, the temperature of a fourth zone is 200 ℃, the temperature of a fifth zone is 195 ℃, and the temperature of a machine head is 190 ℃.
Preparing a graphene modified heat-resistant PE-RT pipe: adding the graphene modified heat-resistant PE-RT master batch and the PE-RT into a high-speed mixer according to the weight ratio of 1:10, stirring at a high speed for 10min, discharging the materials, and adding into a single-screw extruder at the main screw rotation speed of 400r/min, wherein the temperature of a first area of a charging barrel is 185 ℃, the temperature of a second area is 190 ℃, the temperature of a third area is 195 ℃, the temperature of a fourth area is 200 ℃, the temperature of a fifth area is 195 ℃ and the temperature of a machine head is 190 ℃.
The performance of the graphene modified heat-resistant PE-RT tube is measured, and the test results are shown in Table 1.
TABLE 1 Performance of graphene modified Heat resistant PE-RT tubes
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, so that any modifications, equivalents, improvements and the like, which are within the spirit and principle of the present invention, should be included in the scope of the present invention.
Claims (9)
1. A graphene modified heat-resistant PE-RT pipe is characterized in that: the graphene/phyllosilicate nano hybrid material comprises, by weight, 100 parts of PE-RT, 0.02-1 part of an antioxidant and 0.1-3 parts of a graphene/phyllosilicate nano hybrid material; the preparation method of the graphene/phyllosilicate hybrid material comprises the following steps of uniformly mixing a graphene oxide dispersion liquid and a plant polyphenol solution, then adding phyllosilicate, fully stirring, heating to 50-90 ℃, and reacting for 6-15 hours; the mass ratio of the graphene oxide to the plant polyphenol to the layered silicate is 1: (0.5-1): (0.1 to 1).
2. The graphene-modified heat-resistant PE-RT tube according to claim 1, characterized in that: the plant polyphenol comprises one or more of catechol, catechin, gallic acid and hydrolyzed tannin; the phyllosilicate is one or more of montmorillonite, hydrotalcite, hectorite, kaolin, smectite, illite, attapulgite, sepiolite, vermiculite and hydromica.
3. The graphene-modified heat-resistant PE-RT tube according to claim 1, characterized in that: the concentration of the graphene oxide dispersion liquid is 0.5-1.5 mg/mL; the concentration of the plant polyphenol solution is 0.5-1.5 mg/mL.
4. The graphene-modified heat-resistant PE-RT tube according to claim 3, wherein: the concentration of the graphene oxide dispersion liquid is 1 mg/mL; the concentration of the plant polyphenol solution is 1 mg/mL.
5. The graphene-modified heat-resistant PE-RT tube according to claim 1, characterized in that: in the preparation of the graphene/phyllosilicate hybrid material, the graphene/phyllosilicate hybrid material is heated to 60-80 ℃ and reacts for 8-10 hours.
6. The graphene-modified heat-resistant PE-RT tube according to claim 1, characterized in that: the antioxidant is a mixture of hindered phenol antioxidant, phosphite antioxidant and thioester antioxidant, and the weight ratio of the hindered phenol antioxidant to the phosphite antioxidant is 0.05-0.5: 0.1-0.5: 0.05 to 0.5.
7. The graphene-modified heat-resistant PE-RT tube according to claim 6, wherein: the hindered phenol antioxidant is selected from pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], (2,4, 6-trioxo-1, 3, 5-triazine-1, 3,5(2H,4H,6H) -triyl) trivinyltris [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) acrylate ], 1, 3-tris (2-methyl-4-hydroxy-5-tert-butylphenyl) butane, 1,3, 5-trimethyl-2, 4, 6-tris (3, 5-di-tert-butyl-4-hydroxybenzyl) benzene, 1,3, 5-tris (4-tert-butyl-3-hydroxy-2, 6-dimethylbenzyl) -1, one or more than two of 3, 5-triazine-2, 4,6- (1H,3H,5H) -trione and 1,3, 5-tris (3, 5-di-tert-butyl-4-hydroxybenzyl) s-triazine-2, 4,6- (1H,3H,5H) trione; the phosphite antioxidant is selected from one of tris (2, 4-di-tert-butylphenyl) phosphite or pentaerythritol diphosphite bis (2, 4-di-tert-butylphenyl) ester; the thioester antioxidant is dioctadecyl thiodipropionate or dilauryl thiodipropionate.
8. A method for preparing the graphene modified heat-resistant PE-RT tube as claimed in any one of claims 1 to 7, wherein: comprises the following steps of (a) carrying out,
1) adding an antioxidant, a graphene/phyllosilicate hybrid material and PE-RT into a high-speed mixer, stirring at a high speed for 10-30 min, discharging the materials, and adding the materials into a double-screw extruder for extrusion granulation; the rotation speed of the main screw is 100-300 r/min, the temperature of a first zone of the charging barrel is 170-200 ℃, the temperature of a second zone is 175-205 ℃, the temperature of a third zone is 180-210 ℃, the temperature of a fourth zone is 185-215 ℃, the temperature of a fifth zone is 180-210 ℃, and the temperature of a machine head is 175-205 ℃, so that the graphene modified heat-resistant PE-RT master batch is obtained;
2) adding the PE-RT and graphene modified heat-resistant PE-RT master batch into a high-speed mixer, stirring at a high speed for 5-10 min, discharging the materials, and adding into a single-screw extruder, wherein the rotating speed of a main screw is 300-500 r/min, the temperature of a first zone of a charging barrel is 170-200 ℃, the temperature of a second zone is 175-205 ℃, the temperature of a third zone is 180-210 ℃, the temperature of a fourth zone is 185-215 ℃, the temperature of a fifth zone is 180-210 ℃, and the temperature of a machine head is 175-205 ℃.
9. The method of modifying a heat resistant PE-RT tube with graphene according to claim 8, wherein: in the step 1), the temperature of a first area of the charging barrel is 185 ℃, the temperature of a second area is 190 ℃, the temperature of a third area is 195 ℃, the temperature of a fourth area is 200 ℃, the temperature of a fifth area is 195 ℃ and the temperature of a machine head is 190 ℃;
in the step 2), the temperature of the first zone of the charging barrel is 185 ℃, the temperature of the second zone is 190 ℃, the temperature of the third zone is 195 ℃, the temperature of the fourth zone is 200 ℃, the temperature of the fifth zone is 195 ℃ and the temperature of the machine head is 190 ℃.
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