CN111171458B - Oil-resistant heat-resistant material for oil tank built-in pipe and preparation method thereof - Google Patents

Oil-resistant heat-resistant material for oil tank built-in pipe and preparation method thereof Download PDF

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CN111171458B
CN111171458B CN202010032600.1A CN202010032600A CN111171458B CN 111171458 B CN111171458 B CN 111171458B CN 202010032600 A CN202010032600 A CN 202010032600A CN 111171458 B CN111171458 B CN 111171458B
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oil
resistant
heat
screw extruder
parts
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CN111171458A (en
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宋林
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Wanhua Chemical Group Co Ltd
Wanhua Chemical Ningbo Co Ltd
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Wanhua Chemical Ningbo Co Ltd
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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
    • C08L23/10—Homopolymers or copolymers of propene
    • C08L23/14—Copolymers of propene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a non-planar shape
    • B32B1/08—Tubular products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/04—Coatings characterised by the materials used
    • F16L58/10—Coatings characterised by the materials used by rubber or plastics
    • F16L58/1054—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe
    • F16L58/109—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe the coating being an extruded layer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00—Rigid pipes
    • F16L9/12—Rigid pipes of plastics with or without reinforcement
    • F16L9/121—Rigid pipes of plastics with or without reinforcement with three layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2597/00—Tubular articles, e.g. hoses, pipes
    • 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
    • C08K2201/00—Specific properties of additives
    • C08K2201/011—Nanostructured additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2201/00—Properties
    • C08L2201/08—Stabilised against heat, light or radiation or oxydation
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
    • C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Laminated Bodies (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

The application discloses an oil-resistant and heat-resistant composition, an oil-resistant and heat-resistant material comprising an inner layer, a bonding layer and a modified polypropylene outer layer and used for an oil tank internal pipe, and a method for preparing the oil-resistant and heat-resistant material. The oil-resistant and heat-resistant material has the performances of oil resistance, heat resistance and high impact resistance.

Description

Oil-resistant heat-resistant material for oil tank built-in pipe and preparation method thereof
Technical Field
The application belongs to the field of synthesis and processing of high polymer materials, and particularly relates to an oil-resistant heat-resistant material for an oil tank inner pipe and a preparation method thereof.
Background
With the development of the automobile industry, higher requirements are put forward on automobile materials, and the materials required by the development of automobiles are gradually developed towards light weight and high stability. Among many materials, stability of automotive functional parts is particularly important.
The built-in pipe of the automobile oil tank is used as a part of an internal part of the oil tank, the main function of the built-in pipe is to convey fuel oil, higher temperature needs to be borne in the using process, high oil resistance and heat resistance are needed for the material, and good mechanical performance needs to be kept.
At present, HDPE materials are mostly adopted as materials of built-in pipelines of the oil tank, the built-in pipelines are single-layer pipelines, the built-in pipelines are poor in toughness and become brittle and easy to break in a low-temperature environment, and meanwhile, the built-in pipelines are easy to adhere to the oil tank in the assembly process of the manufactured pipelines, so that certain problems exist in the machining process. Some researchers try to improve some synthetic rubber materials, but the mechanical properties of pure rubber materials are difficult to meet the requirements of parts, and small molecules contained in a rubber material system can migrate into fuel oil to influence oil products, so that potential safety hazards are caused.
In order to improve the oil resistance and heat resistance of an oil pipe, people modify the material of the oil pipe so as to improve the processing and performance of the existing material, CN 110281595A discloses a three-layer pipeline improvement scheme which uses modified polypropylene as an outer layer and HDPE as an inner layer, and can perform preliminary improvement, but the heat resistance temperature of the pipeline is lower, only 60 ℃, and the pipeline is deformed due to the high temperature, which is not beneficial to the long-term use of the pipeline. CN 108329579A discloses an oil-resistant polypropylene composite material, which is cleaned by engine oil, gasoline, n-heptane and ethanol, the performance of the material is kept well, but the soaking time is only 24h, and the material is treated at normal temperature, so that the use has certain limitation.
Disclosure of Invention
In view of the above problems in the art, the present application aims at providing an oil-resistant, heat-resistant and high-impact-resistant material for oil tank inner tubes, which can achieve a high resistance standard under a long-term soaking at high temperature. In order to achieve the purpose of the application, the following technical scheme is adopted.
One or more embodiments of the present application provide an oil and heat resistant composition comprising 45-60 parts of a polypropylene resin, 10-35 parts of an oil resistant component, 3-15 parts of a polyolefin compatibilizer, 5-12 parts of a heat resistant filler, 0.1-1 part of an antioxidant, 0.2-1 part of a lubricant, and 0.01-1 part of a nucleating agent. The parts are weight parts.
One or more embodiments of the present application provide an oil-resistant and heat-resistant material for an oil tank inner pipe, which includes an inner layer, a bonding layer and a modified polypropylene outer layer, wherein the inner layer is composed of HDPE, the bonding layer includes a polyolefin compatilizer or is composed of a polyolefin compatilizer, and the modified polypropylene outer layer includes 45-60 parts of polypropylene resin, 10-35 parts of an oil-resistant component, 3-15 parts of a polyolefin compatilizer, 5-12 parts of a heat-resistant filler, 0.1-1 part of an antioxidant, 0.2-1 part of a lubricant and 0.01-1 part of a nucleating agent. The parts are weight parts.
In one or more embodiments herein, the polypropylene resin is one or both of homo-polypropylene and co-polypropylene.
In one or more embodiments herein, the polypropylene resin has a melt index of 0.5 to 30g/10min, and the test conditions are 230 ℃ and 2.16kg.
In one or more embodiments of the present application, the polyolefin compatibilizer is prepared by melting one or more of an ethylene/propylene interpolymer (e.g., vistamaxx 6102), an ethylene/butene interpolymer (e.g., engage 7467), an ethylene/octene interpolymer (e.g., engage 8150), a polypropylene (e.g., T30S) with a peroxide (e.g., dicumyl peroxide (DCP)), and solid phase grafting with one or more polar monomers of Maleic Anhydride (MAH), glycidyl Methacrylate (GMA), acrylic Acid (AA).
In one or more embodiments herein, the heat resistant filler is surface activated nano silica having a size of 1-100nm, such as 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 20, 30, 40, 50, 60, 70, 80, 90nm.
In one or more embodiments of the present application, the surfactant for surface activation is one or more of KH570, KH560 and a soap active agent.
In one or more embodiments herein, the oil resistant component is a grease-impregnated SEBS or a fluoroelastomer.
In one or more embodiments herein, the flushing SEBS is flushed with one or more of paraffin oil, white oil, naphthenic oil.
In one or more embodiments herein, the fluororubber includes one or more of polyolefin group fluororubbers, tetrapropylene fluororubbers, and phosphazene fluororubbers.
In one or more embodiments herein, the lubricant is one or more of calcium stearate, zinc stearate, polyethylene wax, ethylene bisstearamide.
In one or more embodiments herein, the antioxidant is one or more of pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], tris- (2, 4-di-tert-butylphenyl) phosphite, dioctadecyl thiodipropionate.
In one or more embodiments herein, the nucleating agent is one or more of 2,2-methylene-bis- (4, 6-di-t-butylphenyl) phosphate sodium salt, aryldicarboxamide, bis [2,2-methylene-bis- (4, 6-di-t-butylphenyl) phosphate ] aluminum hydroxy salt.
In one or more embodiments herein, the inner layer, tie layer and modified polypropylene outer layer have a thickness of 0.1 to 5mm, 0.1 to 1mm and 0.5 to 5mm, respectively.
One or more embodiments of the present application provide a preparation method of the oil-resistant and heat-resistant material for an oil tank internal pipe, which includes co-extruding the inner layer, the bonding layer, and the modified polypropylene outer layer through a single screw extruder to obtain three layers, wherein the modified polypropylene outer layer is obtained by extruding through a double screw extruder.
In one or more embodiments herein, the single screw extruder length to diameter ratio is from 28 to 50; the temperature of the single-screw extruder is as follows: the feeding section is 120-190 ℃, the melting homogenization section is 170-250 ℃, and the head is 190-210 ℃; the screw rotating speed of the single-screw extruder is 80-300rpm/min; the traction speed of the single-screw extruder is 5-30m/min.
In one or more embodiments herein, the modified polypropylene outer layer is extruded using a twin screw extruder; the length-diameter ratio of the double-screw extruder is 28-50; the temperature of the twin-screw extruder is as follows: the feeding section is 130-170 ℃, the melting homogenization section is 190-230 ℃, and the head is 190-210 ℃; the screw rotating speed of the double-screw extruder is 100-600rpm/min.
One or more embodiments of the present application provide a fuel tank inner tube formed of an oil and heat resistant material as described herein.
The technical scheme of the application has one or more of the following beneficial effects at least:
three layers of pipelines are obtained by co-extruding three layers of modified polypropylene and HDPE, so that the processing and performance of the built-in pipeline of the oil tank are combined;
the main components are polyolefin materials, so that the density and the cost are reduced, and the method has great practical significance for realizing light weight of automobiles;
the mesoporous nano silicon dioxide is filled in the modified polypropylene, so that good compatibility is realized, a great effect is achieved on improving the heat resistance of the pipeline, and the heat resistance of the polymer is improved;
the three-layer pipeline is obtained through a three-layer co-extrusion process, the oil resistance, heat resistance and low temperature resistance of the pipeline are improved, the outer layer of the pipeline is prepared by selecting a modified polypropylene material, and the bonding performance of the inner layer and the outer layer is better by using a bonding agent;
the synergistic effect generated by the oil flushing SEBS and the fluororubber resin plays a remarkable role in improving the oil resistance of the polyolefin material, and can maintain good performance for different oil products such as kerosene, diesel oil and gasoline after being continuously soaked for 500 hours at 120 ℃;
the performance requirements of the automobile functional parts in different environments can be met;
the pipeline material has good stability, can prevent the infiltration and corrosion of fuel to the pipeline, and is beneficial to the popularization of the light-weight automobile material.
Drawings
Fig. 1 is a schematic view of a twin-screw extruder of the present application, wherein 1 is a twin-screw extruder drive motor, 2 is a twin-screw extruder feed hopper, 3 is a twin-screw extruder body, 4 is a twin-screw extruder pelletizer, and 5 is a twin-screw extruder pelletizer roll.
Fig. 2 is a schematic diagram of a single screw extruder of the present application, where 6 is a single screw extruder drive motor, 7 is a single screw extruder hopper, 8 is a single screw extruder body, 9 is a single screw extruder cold water tank, and 10 is a three-layer pipeline.
Detailed Description
The preparation process of the present application is further illustrated in detail by the following examples, but the present application is not limited thereto. The examples are intended to further describe and demonstrate embodiments within the scope of the present application.
The raw materials and equipment sources described in the examples:
copolymer polypropylene, homo-polypropylene: china petrochemical group Co., ltd;
perfluoropropene: the middle morning light chemical research institute;
SEBS: taikuo industries, inc.;
engage7467: DOW group;
nano silicon dioxide: hangzhou Wanjing New materials Co., ltd;
white oil: zhonghainan union energy limited;
antioxidant 1010, 168, DSTDP: basf corporation;
KH560, KH570: guangzhou Yi\29682to Sheng chemical Co., ltd;
single-screw and double-screw extruders: south Beijing Beikelong machines, inc.;
a mixer: shanghai Hujia powder machinery equipment Co.
All formulations and tests herein were performed in an environment of about 23 ℃ unless otherwise indicated.
Unless otherwise indicated, "parts" in the following examples represent parts by weight.
The twin-screw extruder in the following examples is constructed as shown in FIG. 1, and the single-screw extruder is constructed as shown in FIG. 2.
Example 1
97 parts of ethylene/butylene copolymer (Engage 7467), 1.5 parts of dicumyl peroxide (DCP), 1.2 parts of Glycidyl Methacrylate (GMA) and 0.3 part of antioxidant are added into a double-screw extruder to be granulated to obtain a compatilizer A, the raw materials are weighed according to the components and the mixture ratio (parts by weight) in the table 1 and mixed in a high-speed mixer for 5min, the raw materials are uniformly mixed, the mixed blend is extruded and granulated by the double-screw extruder to obtain a modified polypropylene outer layer, the length-diameter ratio of an extrusion screw is 35, the extrusion rotating speed is 350rpm/min, and the test performance is shown in the table 2.
The outer layer of the modified polypropylene, the bonding layer and the HDPE are co-extruded by a single-screw extruder respectively to obtain a three-layer pipeline, the length-diameter ratio of the outer layer extrusion screw is 34, the length-diameter ratio of the inner layer extrusion screw is 28, the length-diameter ratio of the bonding layer extrusion screw is 28, the prepared three-layer pipeline is tested, and the test results are shown in table 3.
Example 2
97 parts of ethylene/octene copolymer (Engage 8150), 1.5 parts of dicumyl peroxide (DCP), 1.2 parts of Maleic Anhydride (MAH) and 0.3 part of antioxidant are added into a double-screw extruder to obtain a compatilizer B, the raw materials are weighed according to the components and the proportion (parts by weight) in the table 1, mixed for 5min in a high-speed mixer, the raw materials are uniformly mixed, the mixed blend is extruded and granulated by the double-screw extruder to obtain a modified polypropylene outer layer, the length-diameter ratio of an extrusion screw is 50, the extrusion rotating speed is 600rpm/min, and the test performance is shown in the table 2.
The modified polypropylene outer layer, the bonding layer and the HDPE are co-extruded through the single-screw extruder respectively to obtain three layers of pipelines, the length-diameter ratio of the outer layer extrusion screw is 34, the length-diameter ratio of the inner layer extrusion screw is 28, the length-diameter ratio of the bonding layer extrusion screw is 28, the prepared three layers of pipelines are tested, and test results are shown in table 3.
Example 3
97 parts of ethylene/propylene copolymer (Vistamaxx 6102), 1.5 parts of dicumyl peroxide (DCP), 1.2 parts of Acrylic Acid (AA) and 0.3 part of antioxidant are added into a double-screw extruder to obtain a compatilizer C, the raw materials are weighed according to the components and the mixture ratio (parts by weight) in the table 1, the raw materials are mixed for 5min in a high-speed mixer, the raw materials are uniformly mixed, the mixed blend is extruded and granulated by the double-screw extruder to obtain a modified polypropylene outer layer, the length-diameter ratio of an extrusion screw is 50, the extrusion rotating speed is 600rpm/min, and the test performance is shown in the table 2.
The modified polypropylene outer layer, the bonding layer and the HDPE are co-extruded through the single-screw extruder respectively to obtain three layers of pipelines, the length-diameter ratio of the outer layer extrusion screw is 34, the length-diameter ratio of the inner layer extrusion screw is 28, the length-diameter ratio of the bonding layer extrusion screw is 28, the prepared three layers of pipelines are tested, and test results are shown in table 3.
Example 4
97.2 parts of ethylene/butylene copolymer (Engage 7467), 1.0 part of dicumyl peroxide (DCP), 1.5 parts of Glycidyl Methacrylate (GMA) and 0.3 part of antioxidant are added into a double-screw extruder to obtain a compatilizer D, the raw materials are weighed according to the components and the mixture ratio (parts by weight) in the table 1 and mixed in a high-speed mixer for 5min, the raw materials are uniformly mixed, the mixed blend is extruded and granulated by the double-screw extruder to obtain a modified polypropylene outer layer, the length-diameter ratio of an extrusion screw is 50, the extrusion rotating speed is 600rpm/min, and the test performance is shown in the table 2.
And then co-extruding the modified polypropylene outer layer, the bonding layer and the HDPE respectively through a single-screw extruder to obtain a three-layer pipeline, wherein the length-diameter ratio of the outer-layer extrusion screw is 34, the length-diameter ratio of the inner-layer extrusion screw is 28, and the length-diameter ratio of the bonding layer extrusion screw is 28, and the prepared three-layer pipeline is tested, and the test results are shown in table 3.
Example 5
97 parts of ethylene/butylene copolymer (Vistamaxx 6102), 1.5 parts of dicumyl peroxide (DCP), 1.2 parts of Glycidyl Methacrylate (GMA) and 0.3 part of antioxidant are added into a double-screw extruder to obtain a compatilizer E, the raw materials are weighed according to the components and the mixture ratio (parts by weight) in the table 1 and mixed in a high-speed mixer for 5min, the raw materials are uniformly mixed, the mixed blend is extruded and granulated by the double-screw extruder to obtain a modified polypropylene outer layer, the length-diameter ratio of an extrusion screw is 50, the extrusion rotating speed is 600rpm/min, and the test performance is shown in the table 2.
And then co-extruding the modified polypropylene outer layer, the bonding layer and the HDPE respectively through a single-screw extruder to obtain a three-layer pipeline, wherein the length-diameter ratio of the extrusion screw of the outer layer is 34, the length-diameter ratio of the extrusion screw of the inner layer is 28, the length-diameter ratio of the extrusion screw of the bonding layer is 28, the prepared three-layer pipeline is tested, and the test results are shown in table 3.
Comparative example 1
The inner modified polypropylene of the three-layer oil-resistant high-impact-resistant material comprises the following raw materials in parts by weight:
80 parts of copolymerized polypropylene resin
Polypropylene modified component, 12 portions of THV material modified polypropylene
6 parts of compatilizer GMA
0.7 part of antioxidant beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) n-octadecyl propionate
0.3 part of lubricant polyethylene wax
Nucleating agent aryldicarboxamide 1.0 part
The raw materials are uniformly mixed, the mixed blend is extruded and granulated by a double-screw extruder to obtain a modified polypropylene outer layer, the length-diameter ratio of an extrusion screw is 50, the extrusion rotating speed is 600rpm/min, and the test performance is shown in table 2.
Preparing three layers of pipeline materials: and then co-extruding the modified polypropylene, the bonding layer and the HDPE respectively through a single-screw extruder to obtain a three-layer pipeline, wherein the length-diameter ratio of the outer-layer extrusion screw is 34, the length-diameter ratio of the inner-layer extrusion screw is 28, and the length-diameter ratio of the bonding layer extrusion screw is 28, and the prepared three-layer pipeline is tested, and the test results are shown in table 3.
Table 1 examples modified Polypropylene outer layer Components
Name of raw materials Example 1 Example 2 Example 3 Example 4 Example 5
Polypropylene copolymer 58.5 58.0 45.5 49.9 51.6
Homo-polypropylene / / 12 / 15
SEBS 15 15 15 / /
Perfluoropropenes / / 11 25 13
Compatibilizer A 10 / / / /
Compatibilizer B / 15 / / /
Compatibilizer C / / 3 / /
Compatibilizing agents D / / / 13 /
Compatibilizing agent E / / / / 11
Nano silicon dioxide 5 5 5 10 8
White oil 10 10 7 / /
Antioxidant 168 0.2 0.2 0.2 0.2 0.2
Antioxidant 1010 0.3 0.3 0.3 0.3 0.3
Antioxidant DSTDP 0.1 0.1 / 0.2 /
KH570 / 0.5 / 0.5 /
Nucleating agent 0.4 0.4 0.4 0.4 0.4
Polyethylene wax 0.2 0.2 0.2 0.2 0.2
Calcium stearate 0.3 0.3 0.3 / /
Zinc stearate / / / 0.3 0.3
TABLE 2 modified Polypropylene skin Performance test
Figure BDA0002364876880000061
As can be seen from the above table, the modified polypropylene outer layers in examples 1 to 5 have high impact strength and elongation at break, and also have good low temperature impact resistance, so that the working condition requirements of the oil tank pipeline can be greatly met, and a series of mechanical and oil resistance tests are performed on the three-layer pipeline in order to further confirm the use condition of the material in the oil tank, as shown in table 3.
TABLE 3 three-layer Co-extrusion pipeline Performance test
Figure BDA0002364876880000071
As can be seen from the performance tests in tables 2 and 3, the three-layer pipeline has good low-temperature impact resistance, maintains higher impact strength and elongation at break, not only meets the performance requirements, but also reduces the technological requirements on the extruded pipeline. The interlayer adhesion force test shows that the three-layer pipeline has good adhesion, the mechanical property of the pipeline and the interlayer adhesion force have high oil resistance retention rate after the high-temperature oil resistance test, the use requirement of a workpiece can be completely met when the pipeline is soaked at 120 ℃ for 500 hours, and the pipeline can be well utilized in an oil tank pipeline system.
The embodiments described above are intended to facilitate a person skilled in the art to understand and use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art. Therefore, the present invention is not limited to the embodiments described herein, and those skilled in the art should understand that they can make improvements and modifications without departing from the scope of the present invention.

Claims (21)

1. An oil and heat resistant composition comprising, in parts by weight:
45-60 parts of polypropylene resin, 10-35 parts of oil-resistant component, 3-15 parts of polyolefin compatilizer, 5-12 parts of heat-resistant filler, 0.1-1 part of antioxidant, 0.2-1 part of lubricant and 0.01-1 part of nucleating agent; the oil-resistant component is fluororubber; the fluorine rubber is perfluoropropylene;
the polyolefin compatibilizer is prepared by melting one or more of ethylene/propylene copolymer, ethylene/butene copolymer, ethylene/octene copolymer, polypropylene with a peroxide and solid phase grafting with one or more polar monomers of maleic anhydride, glycidyl methacrylate, acrylic acid.
2. The oil and heat resistant composition of claim 1 wherein the heat resistant filler is surface activated nano silica having a size of 1-100nm.
3. The oil-resistant heat-resistant material for the oil tank built-in pipe comprises an inner layer, a bonding layer and a modified polypropylene outer layer, wherein the inner layer is composed of HDPE, the bonding layer comprises a polyolefin compatilizer or consists of a polyolefin compatilizer, and the modified polypropylene outer layer comprises, by weight, 45-60 parts of polypropylene resin, 10-35 parts of an oil-resistant component, 3-15 parts of a polyolefin compatilizer, 5-12 parts of a heat-resistant filler, 0.1-1 part of an antioxidant, 0.2-1 part of a lubricant and 0.01-1 part of a nucleating agent; the oil-resistant component is fluororubber; the fluororubber is perfluoropropylene;
the polyolefin compatibilizer is prepared by melting one or more of ethylene/propylene copolymer, ethylene/butene copolymer, ethylene/octene copolymer, polypropylene with a peroxide and solid phase grafting with one or more polar monomers of maleic anhydride, glycidyl methacrylate, acrylic acid.
4. The oil and heat resistant material of claim 3 wherein the polypropylene resin is one or both of homo polypropylene and co polypropylene.
5. The oil and heat resistant material of claim 4 wherein the polypropylene resin has a melt index of 0.5 to 30g/10min, as measured at 230 ℃ and 2.16kg.
6. The oil and heat resistant material of claim 3 wherein the heat resistant filler is surface activated nano silica having a size of 1-100nm.
7. The oil and heat resistant material of claim 6 wherein the nanosilica has a size of from 2 to 50nm.
8. The oil and heat resistant material of claim 6, wherein the surface activating surfactant is one or more of KH570, KH560 and soap activator.
9. The oil and heat resistant material of claim 3 wherein the lubricant is one or more of calcium stearate, zinc stearate, polyethylene wax, ethylene bis stearamide.
10. The oil and heat resistant material of claim 9 wherein the antioxidant is one or more of pentaerythritol tetrakis [ β - (3, 5-di-t-butyl-4-hydroxyphenyl) propionate ], tris- (2, 4-di-t-butylphenyl) phosphite, and dioctadecyl thiodipropionate.
11. The oil and heat resistant material as claimed in claim 9, wherein the nucleating agent is one or more of sodium 2, 2-methylene-bis- (4, 6-di-t-butylphenyl) phosphate, aryldicarboxamide, bis [2, 2-methylene-bis- (4, 6-di-t-butylphenyl) phosphate ] aluminum hydroxy salt.
12. The oil and heat resistant material of any one of claims 3 to 11, wherein the inner layer, the tie layer and the modified polypropylene outer layer have a thickness of 0.1 to 5mm, 0.1 to 1mm and 0.5 to 5mm, respectively.
13. The method for preparing the oil-resistant and heat-resistant material for the oil tank internal pipe as claimed in any one of claims 3 to 12, which comprises extruding the modified polypropylene outer layer material by a double-screw extruder, and then co-extruding the inner layer material, the bonding layer material and the modified polypropylene outer layer material by a single-screw extruder to obtain the oil-resistant and heat-resistant material.
14. The method according to claim 13, wherein the single-screw extruder has a length to diameter ratio of 28 to 50.
15. The method of claim 13, wherein the single screw extruder temperature is: the feeding section is 120-190 ℃, the melting and homogenizing section is 170-250 ℃, and the head is 190-210 ℃.
16. The method of claim 13, wherein the single screw extruder has a screw rotation speed of 80 to 300rpm/min.
17. The method of claim 13, wherein the single screw extruder has a haul-off speed of 5 to 30m/min.
18. The method of claim 13, wherein the twin-screw extruder has an aspect ratio of 28 to 50.
19. The method of claim 13, wherein the twin-screw extruder has a temperature of: the feeding section is 130-170 ℃, the melting homogenization section is 190-230 ℃, and the head is 190-210 ℃.
20. The method of claim 13, wherein the twin-screw extruder has a screw rotation speed of 100 to 600rpm/min.
21. An oil-and heat-resistant tank inner pipe formed of the oil-and heat-resistant material according to any one of claims 3 to 12.
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