CN112280184A - Electron irradiation crosslinking foaming polypropylene heat preservation belt and preparation method thereof - Google Patents
Electron irradiation crosslinking foaming polypropylene heat preservation belt and preparation method thereof Download PDFInfo
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- CN112280184A CN112280184A CN202011244914.4A CN202011244914A CN112280184A CN 112280184 A CN112280184 A CN 112280184A CN 202011244914 A CN202011244914 A CN 202011244914A CN 112280184 A CN112280184 A CN 112280184A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/28—Treatment by wave energy or particle radiation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/06—Polyethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/06—Polyethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/10—Homopolymers or copolymers of propene
- C08J2423/12—Polypropene
Abstract
The invention provides an electron irradiation crosslinking foaming polypropylene thermal insulation belt which comprises the following raw materials in parts by weight: 40-60 parts of polypropylene, 40-60 parts of polyethylene, 3-5 parts of an electronic foaming agent and 5-8 parts of a functional auxiliary agent; the invention provides an electron irradiation crosslinking foaming polypropylene thermal insulation belt which can improve the heat conductivity coefficient and the seabed compression strength; the prepared heat preservation belt is effectively improved in the aspects of heat conduction, compression strength and the like by utilizing the mutual matching of the extruder, the electron irradiation system, the high-temperature normal-pressure horizontal foaming system and the slitting system.
Description
Technical Field
The invention relates to a heat preservation belt, in particular to an electronic irradiation crosslinking foaming polypropylene heat preservation belt and a preparation method thereof.
Background
At present, the application of hoses in ocean engineering is increasing day by day, and in the process of pipeline transportation, when the oil temperature is reduced to a certain value without special measures, wax components with high molecular weight and low molecular weight can be separated out successively for some crude oil with higher consistency (such as crude oil with wax, gel and other high condensation point), so that the viscosity of the crude oil is increased and the fluidity is poor. Or under the condition of conveying natural gas at high pressure and long distance, the natural gas hydrate is separated out in a solid state shape like loose ice, and pipeline blockage and the like are caused when the natural gas hydrate is serious, so that production accidents are caused. Therefore, the submarine pipeline needs to be effectively insulated to ensure the normal operation of the pipeline.
The technical level of the development of the domestic submarine pipeline heat-insulating material is low, the conditions of generally low heat conductivity coefficient and compression strength exist, the ocean heat-insulating material depends on import from abroad, the equipment and the manufacturing cost are high, and the transportation period is long. Therefore, a new heat-insulating material for deep-water seabed oil and gas pipelines needs to be developed to meet the requirement of domestic deep-water oil and gas development.
Disclosure of Invention
The invention aims to provide an electron irradiation crosslinking foaming polypropylene thermal insulation belt and a preparation method thereof, which aim to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
an electron irradiation crosslinking foaming polypropylene thermal insulation belt comprises the following raw materials in parts by weight:
40-60 parts of polypropylene, 40-60 parts of polyethylene, 3-5 parts of an electronic foaming agent and 5-8 parts of a functional auxiliary agent.
A preparation method of an electron irradiation crosslinking foaming polypropylene thermal insulation belt comprises the following steps:
s1, modifying raw materials;
performing molecular modification on polyethylene and polypropylene by a high-energy electron beam by adopting an electron irradiation method, wherein the irradiation dose is 1.5MGV, and the rate is 10.2;
s2, proportioning raw materials;
according to the raw material formula, the modified polypropylene, the modified polyethylene, the electronic foaming agent and the functional auxiliary agent are proportioned, injected into a high-speed mixer through an injection system, physically mixed for more than 30min, and taken out and placed into a first container for later use;
s3, extruding the master slice;
injecting the mixture in the first container into an extruder through an injection system, shaping the mixture in the extruder through a forming die system after the mixture in the extruder is in a molten state, and carrying out uniform traction through double traction rollers to form a master slice with uniform thickness; then, after the mother film is wound by a winding mother film system, waiting for electron irradiation;
wherein, the joint of the extruder and the molding die system is subjected to secondary heating in a nested mode, and the heating temperature is 170-190 ℃;
s4, electron irradiation;
after the master slice is extruded, processing the master slice by electron irradiation;
s5, horizontal foaming;
after the mother sheet subjected to electron irradiation is placed for 24 hours, low-temperature and high-foaming are carried out through a high-temperature normal-pressure horizontal foaming system;
s6, slitting;
after foaming, the master slice enters a slitting system and is slit into strip-shaped structures;
s7, winding a finished product;
and a multi-station winding machine is adopted to wind the heat preservation belt.
As a further scheme of the invention: the thickness of the master slice is 2.60-2.7mm, and the width is 500-600 mm.
As a further scheme of the invention: the rotating speed of the extruder is 16-20Hz/min, the voltage is 290-340V, the current is 160-240A, the internal pressure of the extruder material is 1.2-4MPa, and the pressure of the front section die orifice net is 2.0-4.5 MPa.
As a further scheme of the invention: the temperature of the six extrusion areas of the extruder is 160-180 ℃, and the temperature of the six extrusion areas of the single-opening die is 155-175 ℃.
As a further scheme of the invention: the width of the heat-preservation belt is 30-90mm, the length is 200-600m, and the thickness is 2-10 mm.
As a further scheme of the invention: the inner diameter of the winding drum is 200-450mm, the thickness is 20-30mm, and the weight is 2-3.5 kg.
As a further scheme of the invention: the heat-insulating belt has a heat conductivity of 0.060-0.090W/m.k, a compressive strength of more than 2MPa, an elongation at break of more than 10% and a density of 0.30-0.50g/cm 3.
As a further scheme of the invention: the application range of the heat preservation belt is 300-3000m under water.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides an electron irradiation crosslinking foaming polypropylene thermal insulation belt which can improve the heat conductivity coefficient and the seabed compression strength; the prepared heat preservation belt is effectively improved in the aspects of heat conduction, compression strength and the like by utilizing the mutual matching of the extruder, the electron irradiation system, the high-temperature normal-pressure horizontal foaming system and the slitting system.
The polypropylene material and the polyethylene material have different melting point temperatures, and the raw materials are modified respectively by an electronic modification method to change the internal structures between the molecules of the polyethylene and the polypropylene so as to improve the physical properties such as tensile strength, elongation at break and the like, and the modified materials are fully blended so as to meet the physical requirements such as heat conductivity coefficient, compression strength and the like.
The invention carries out electronic modification on the raw materials, enhances the physical properties of the raw materials and better ensures that the products obtain ideal technical parameters in the production process. The electronic irradiation crosslinked foaming polypropylene heat preservation belt is adopted in the marine hose, other materials are not foamed, the heat can be effectively preserved in the pipeline, and the weight of the hose can be reduced.
In addition, because the melting point of the electronic foaming agent is slightly lower, the extruder has strong friction capacity, when the extruder is mixed with polypropylene, foaming phenomenon is easy to occur, micropores can be formed inside the master slice, the irradiation process is influenced, the product quality is finally influenced, holes are formed inside the electronic irradiation crosslinking foaming polypropylene heat preservation zone, and the heat conductivity coefficient is reduced. In order to solve the problem, a secondary heating mode is adopted, the secondary heating is carried out at the position of the joint of the extruder and the die, a nesting mode is adopted for heating, and when the polyethylene and the polypropylene are fully mixed in the extruder, the full mixing of the electronic foaming agent and the polypropylene is ensured.
Meanwhile, the electron irradiation crosslinking foaming polypropylene heat preservation belt is melted by an extruder, directly shaped in a special mould, irradiated, foamed, cut and calculated, and the product size requirement can meet the use requirement after the electron irradiation crosslinking foaming polypropylene heat preservation belt is cooled. In the installation winding process, convenient construction is injectd the meter number, reel diameter size, height, and the independent design station rolling ware guarantees that every roll of product size is unanimous, and the transportation is convenient, construction convenience. The invention reduces the production cost, realizes the localization, has short transportation period, improves the project progress, and is simple and convenient in construction.
Drawings
FIG. 1 is a schematic view of a preparation system of an electron irradiation crosslinking foaming polypropylene thermal insulation belt and a preparation method thereof.
FIG. 2 is a flow chart of an electron irradiation crosslinking foaming polypropylene thermal insulation belt and a preparation method thereof.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
Referring to fig. 1-2, an electron irradiation crosslinked foamed polypropylene thermal insulation belt comprises the following raw materials in parts by weight:
40-60 parts of polypropylene, 40-60 parts of polyethylene, 3-5 parts of an electronic foaming agent and 5-8 parts of a functional auxiliary agent.
A preparation method of an electron irradiation crosslinking foaming polypropylene thermal insulation belt comprises the following steps:
s1, modifying raw materials;
performing molecular modification on polyethylene and polypropylene by a high-energy electron beam by adopting an electron irradiation method, wherein the irradiation dose is 1.5MGV, and the rate is 10.2;
s2, proportioning raw materials;
according to the raw material formula, the modified polypropylene, the modified polyethylene, the electronic foaming agent and the functional auxiliary agent are proportioned, injected into a high-speed mixer through an injection system, physically mixed for more than 30min, and taken out and placed into a first container for later use;
s3, extruding the master slice;
injecting the mixture in the first container into an extruder through an injection system, shaping the mixture in the extruder through a forming die system after the mixture in the extruder is in a molten state, and carrying out uniform traction through double traction rollers to form a master slice with uniform thickness; after the mother plate is rolled by the mother plate rolling system, waiting for electron irradiation, wherein the thickness of the mother plate is 2.60-2.7mm, and the width is 500-600 mm;
wherein, the joint of the extruder and the molding die system is subjected to secondary heating in a nested mode, and the heating temperature is 170-190 ℃;
in addition, the rotating speed of the extruder is 16-20Hz/min, the voltage is 290-340v, the current is 160-240A, the internal pressure of the extruder material is 1.2-4MPa, and the pressure of the front section die orifice net is 2.0-4.5 MPa;
meanwhile, the temperature of the six extrusion areas of the extruder is 160-180 ℃, and the temperature of the six single-opening mold areas is 155-175 ℃;
s4, electron irradiation;
after the master slice is extruded, processing the master slice by electron irradiation;
wherein, the electron irradiation means that the energy of electron ray generated by an electron accelerator (0.2-10.0MeV) or gamma ray generated by a radioactive isotope (Cs-137 or Co-60) is transferred to the irradiated substance, and under the action of ionizing radiation, the irradiated substance is ionized and excited to release free radicals and other active particles, so that the irradiated substance generates physicochemical change to achieve the required result of people, and the technical parameters are as follows:
| parameter(s) | Numerical value |
| High pressure | 2.0 |
| Total flow (ma) | 19.9 |
| Positive pressure (KV) | 8.4 |
| Yang flow (A)A) | 6.5 |
| Vacuum display (pa) | 3.4-5 |
| Traction speed (HZ) | 6.5 |
S5, horizontal foaming;
after the master slice after the electron irradiation is placed for 24 hours, low-temperature and high-foaming are carried out through a high-temperature normal-pressure horizontal foaming system, and the setting parameters of a foaming furnace are as follows:
| parameter(s) | Numerical value |
| Preheating temperature (. degree.C.) | 160-175 |
| Foaming temperature (. degree.C.) | 224-228 |
| Traction speed | 2.0-3.0 |
| Speed of mesh belt | 1.6-2.0 |
S6, slitting;
after foaming, the master slice enters a slitting system and is slit into strip-shaped structures; the width of the heat-preservation belt is 30-90mm, the length is 200-600m, and the thickness is 2-10 mm;
s7, winding a finished product;
rolling the heat preservation belt by adopting a multi-station rolling machine; wherein the inner diameter of the winding drum is 200-450mm, the thickness is 20-30mm, and the weight of a single winding drum is 2-3.5 kg; the test values of the finished product were as follows;
| serial number | Physical Properties | Unit of | Test value |
| 1 | Apparent density | g/cm3 | 0.30-0.50 |
| 2 | Tensile strength | MPa | ≥2 |
| 3 | Elongation at break | ％ | ≥10 |
| 4 | Coefficient of thermal conductivity | W/(m·k) | 0.060-0.090 |
In this example, the raw materials used illustrate:
polypropylene material, density: 0.90-0.93g/cm3, melt index: 1.0-10g/10 min;
polyethylene material, density: 0.92-0.93g/cm3, melt index: 2.0-8g/10 min;
electronic foaming agent, gas forming amount ml/g200-220, decomposition temperature: 170-220, purity > 97;
functional assistant, powder material, density 0.90-1.30g/cm3, melting point 138-.
Although the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present patent within the knowledge of those skilled in the art.
Claims (9)
1. An electron irradiation crosslinking foaming polypropylene thermal insulation belt is characterized by comprising the following raw materials in parts by weight:
40-60 parts of polypropylene, 40-60 parts of polyethylene, 3-5 parts of an electronic foaming agent and 5-8 parts of a functional auxiliary agent.
2. A preparation method of an electron irradiation crosslinking foaming polypropylene thermal insulation belt is characterized by comprising the following steps:
s1, modifying raw materials;
performing molecular modification on polyethylene and polypropylene by a high-energy electron beam by adopting an electron irradiation method, wherein the irradiation dose is 1.5MGV, and the rate is 10.2;
s2, proportioning raw materials;
according to the raw material formula, the modified polypropylene, the modified polyethylene, the electronic foaming agent and the functional auxiliary agent are proportioned, injected into a high-speed mixer through an injection system, physically mixed for more than 30min, and taken out and placed into a first container for later use;
s3, extruding the master slice;
injecting the mixture in the first container into an extruder through an injection system, shaping the mixture in the extruder through a forming die system after the mixture in the extruder is in a molten state, and carrying out uniform traction through double traction rollers to form a master slice with uniform thickness; then, after the mother film is wound by a winding mother film system, waiting for electron irradiation;
wherein, the joint of the extruder and the molding die system is subjected to secondary heating in a nested mode, and the heating temperature is 170-190 ℃;
s4, electron irradiation;
after the master slice is extruded, processing the master slice by electron irradiation;
s5, horizontal foaming;
after the mother sheet subjected to electron irradiation is placed for 24 hours, low-temperature and high-foaming are carried out through a high-temperature normal-pressure horizontal foaming system;
s6, slitting;
after foaming, the master slice enters a slitting system and is slit into strip-shaped structures;
s7, winding a finished product;
and a multi-station winding machine is adopted to wind the heat preservation belt.
3. The method as claimed in claim 2, wherein the thickness of the master is 2.60-2.7mm, and the width is 500-600 mm.
4. The method for preparing an electron irradiation crosslinked foamed polypropylene thermal insulation belt as claimed in claim 2, wherein the rotational speed of the extruder is 16-20Hz/min, the voltage is 290-340v, the current is 160-240A, the internal pressure of the extruder material is 1.2-4MPa, and the pressure of the front section mold opening net is 2.0-4.5 MPa.
5. The method for preparing an electron irradiation crosslinked expanded polypropylene thermal insulation belt as claimed in claim 2, wherein the temperature of the six extrusion zones of the extruder is 160-180 ℃, and the temperature of the six single-port mold zones is 155-175 ℃.
6. The method for preparing an electron irradiation crosslinked foamed polypropylene thermal insulation tape as claimed in claim 2, wherein the thermal insulation tape has a width of 30-90mm, a length of 200-600m and a thickness of 2-10 mm.
7. The method for preparing an electron irradiation crosslinked foamed polypropylene thermal insulation belt as claimed in claim 2, wherein the inner diameter of the winding drum is 200-450mm, the thickness is 20-30mm, and the weight is 2-3.5 kg.
8. The method of claim 2 wherein the insulation belt has a thermal conductivity of 0.060-0.090W/m-k, a compressive strength of greater than 2MPa, an elongation at break of greater than 10%, and a density of 0.30-0.50g/cm 3.
9. The method for preparing an electron irradiation crosslinked foamed polypropylene thermal insulation belt according to claim 2, wherein the thermal insulation belt is applied in the range of 300-3000m under water.
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Application publication date: 20210129 |