CN115536937A - High-temperature-resistant polypropylene extrusion foaming sheet and preparation method thereof - Google Patents

High-temperature-resistant polypropylene extrusion foaming sheet and preparation method thereof Download PDF

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CN115536937A
CN115536937A CN202211199164.2A CN202211199164A CN115536937A CN 115536937 A CN115536937 A CN 115536937A CN 202211199164 A CN202211199164 A CN 202211199164A CN 115536937 A CN115536937 A CN 115536937A
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temperature
melt
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resistant polypropylene
polypropylene
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王大威
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Wuhan Institute of Technology
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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
    • C08J9/12—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 by a physical blowing agent
    • C08J9/122—Hydrogen, oxygen, CO2, nitrogen or noble gases
    • 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
    • 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
    • C08J9/0066—Use of inorganic compounding ingredients
    • 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
    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/06—CO2, N2 or noble gases
    • 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
    • C08J2203/00—Foams characterized by the expanding agent
    • C08J2203/08—Supercritical fluid
    • 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
    • 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
    • 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
    • C08J2423/08—Copolymers of ethene
    • 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
    • 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
    • C08J2423/14—Copolymers of propene

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  • Polymers & Plastics (AREA)
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  • Inorganic Chemistry (AREA)
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Abstract

The invention discloses a high-temperature-resistant polypropylene extrusion foaming sheet and a preparation method thereof, and the high-temperature-resistant polypropylene extrusion foaming sheet comprises the following components in parts by mass: long chain branched high melt strength polypropylene: 40-80 parts; high crystalline polypropylene: 5-45 parts of a solvent; a beta-crystal form nucleating agent: 0.01 to 2 portions. The high-temperature-resistant polypropylene extrusion foaming sheet prepared by the invention has excellent high-temperature resistance, and is suitable for manufacturing packages or containers for heating food or products needing high-temperature disinfection; good chemical stability, and is suitable for the manufacture of most acidic or alkaline products or containers; the grease corrosion resistance is outstanding, and the grease corrosion resistance is suitable for manufacturing the package or the container of fried and baked food or grease-containing products; the packaging adaptability is excellent, the adopted foaming process does not influence the heat sealing performance of the packaging, and the packaging material is suitable for heat sealing packaging of various products or development of various composite materials on the basis of the heat sealing packaging material; the composite material has the advantages of appropriate mechanical properties, high tensile strength and high impact strength, and is suitable for manufacturing packages or containers with good impact resistance and vibration resistance.

Description

High-temperature-resistant polypropylene extrusion foaming sheet and preparation method thereof
Technical Field
The invention relates to a foaming material, in particular to a high-temperature-resistant polypropylene extrusion foaming sheet and a preparation method thereof, belonging to the field of functional materials.
Background
The polypropylene foaming material is a novel polyolefin foaming material with unique performance, and has the excellent mechanical properties of light raw material weight, high use temperature, good degradation performance, high chemical and physical stability, bending resistance, high strength and the like. At present, industrial mass production is initially realized abroad, and the method is mainly applied to the fields of automobiles, packaging, buildings, electronics and the like, and has huge application and development potentials. However, the development of domestic polypropylene foaming materials is still in the experimental development stage, most enterprises rely on imported foreign polypropylene pre-foamed particles to manufacture polypropylene foaming products through secondary foaming and molding, and the gap between the products is huge compared with the large industrialized production developed by foreign independent intellectual property rights, so that the large-scale, multi-level and functional practical requirements and development trends of domestic polypropylene foaming materials and product markets cannot be met.
In recent years, with the issuance of the directive of the national committee for improvement 21, items related to the "guide directory for adjustment of industrial structure" (2011) were partially adjusted, and disposable foamed plastic tableware (foamed tableware for short) was deleted from the category of eliminated products, which means that the disposable foamed plastic tableware is now allowed to enter the market again after being forbidden for 14 years. The polypropylene foaming material plays a great role in promoting the polypropylene foaming material to enter the fields of tableware, food packaging and the like to a certain extent, so that the development of the polypropylene foaming material and the product development become a new development direction in the field, and more attention is paid to people. The polypropylene foaming material can be used as a base material of packaging containers such as bottles, cups, cans, bowls, plates, boxes, bags and the like in the field of packaging, can develop various standard container products, and is very wide in application. The developed packaging container product has high temperature resistance (the heat distortion temperature can reach more than 110 ℃), and can be used as a packaging container for heating food or products needing high-temperature sterilization; the product is acid and alkali resistant, and has good stability for acidic or alkaline products; grease resistance, which is suitable for the package of fried and baked foods or grease-containing products; the heat sealing is easy, and the sealing can be carried out by adopting a heat sealing method in application; the strength is high, and the prepared packaging container has good impact and vibration resistance. Therefore, the development of polypropylene foam materials and preparation methods thereof, which can be applied to the fields of tableware, food packaging and the like, becomes the research focus and development direction in the field, and a high-temperature-resistant polypropylene extrusion foam sheet with the excellent performance, low price, degradability and the like, is urgently needed to provide packaging and other related industries for use.
Disclosure of Invention
Based on the above practical requirements, the technical problem to be solved by the invention is to provide a high-temperature-resistant polypropylene extrusion foaming sheet with excellent performance, low price, degradability and the like and a preparation method thereof.
In order to solve the technical problems, the invention provides the following technical scheme:
a high-temperature-resistant polypropylene extrusion foaming sheet comprises the following components in parts by mass:
long chain branched high melt strength polypropylene: 45-85 parts of a solvent;
high crystalline polypropylene: 5-45 parts of a solvent;
a beta-crystal form nucleating agent: 0.01-2 parts;
wherein, the long-chain branched chain type high melt strength polypropylene has the branched chain carbon number of 10-30, the melt strength of 20-70 cN and the melting temperature of 160-240 ℃;
the high-temperature-resistant polypropylene extrusion foaming sheet has a uniform foam cell structure, the thickness of the high-temperature-resistant polypropylene extrusion foaming sheet is 0.5-3 mm, and the apparent density of the high-temperature-resistant polypropylene extrusion foaming sheet is 50-500 kg/m 3 The expansion ratio is 2 to 20.
As a preferred aspect of the above technical solution, the high temperature resistant polypropylene extrusion foaming sheet provided by the present invention further comprises part or all of the following technical features:
as an improvement of the technical scheme, the high-crystalline polypropylene is one or a mixture of two of high-crystalline homo-polypropylene and impact-resistant co-polypropylene, the melt strength is 15-20 cN, and the melting temperature is 160-240 ℃.
As an improvement of the technical scheme, the beta-crystal form nucleating agent is one or a mixture of more of TMB nucleating agent, WBG nucleating agent, N' -dicyclohexyl-2,6-naphthalamide, gamma-quinacridone, triphendithiazine, anthracene, phenanthrene, vulcanized diphenylamine, pimelic acid, calcium stearate and derivatives.
As an improvement of the technical scheme, the paint also comprises the following components: polyethylene resin: 0.1-10 parts; physical foaming agent: 2-5 parts; filling agent: 0.1-10 parts; lubricant: 0.01-2 parts; antioxidant: 0.01 to 2 portions.
As an improvement of the technical scheme, the polyethylene resin is one or a mixture of a plurality of low-density polyethylene, linear low-density polyethylene, ethylene-vinyl alcohol copolymer, ethylene-acrylic acid copolymer and ethylene propylene rubber, the melt strength is 20-40 cN, the melting temperature is 155-195 ℃, and the polydispersity index is 7.0-8.5.
As an improvement of the technical scheme, the physical foaming agent is one or a mixture of more of carbon dioxide, nitrogen, helium, argon, pentane and butane in a supercritical fluid state.
As an improvement of the technical scheme, the filler is one or a mixture of more of mica, diatomite, montmorillonite, calcium carbonate, talcum powder, barium sulfate, wollastonite, silicon dioxide and titanium dioxide.
As an improvement of the technical scheme, the lubricant is one or a mixture of more of ethylene bis stearamide, oleamide, calcium stearate, zinc stearate, high boiling paraffin, microcrystalline paraffin and fatty acid.
As an improvement of the technical scheme, the antioxidant is one or a mixture of more of antioxidant 1076, antioxidant 1010, antioxidant 300 and antioxidant 168.
The invention also provides a production method of the high-temperature-resistant polypropylene extrusion foaming sheet, which comprises the following process steps:
1) Fully mixing the components except the physical foaming agent by a high-speed mixer according to the mass ratio to obtain dry-mixed raw materials;
2) First-stage blending extrusion: the first-stage extruder adopts a single-screw extruder with a mixing module, the diameter of a screw is 60-150 mm, the length-diameter ratio is 28-36, the rotating speed of the screw is set to be 15-25 r/min, the melt pressure is 15-30 MPa, and the melt temperature is 180-220 ℃;
adding the obtained dry-mixed raw materials into a material feeding device, setting the temperature of a feeding section to be 150-180 ℃, setting the temperature of a melting section to be 170-200 ℃, setting the temperature of a mixing section to be 200-240 ℃, setting the temperature of a homogenizing section to be 200-240 ℃ and setting the temperature of a metering section to be 200-240 ℃; in a first-stage single-screw extruder, dry-mixed raw materials form a blended melt under the actions of melting, shearing and mixing, in the process, a foaming compatilizer is decomposed to release a small amount of gas after reaching the decomposition temperature, the blended melt with a plurality of micro compatibilization cores is formed, a supercritical fluid physical foaming agent is introduced into a melting section, the physical foaming agent is compatible with the compatibilization cores through mixing, the physical foaming agent is fully dispersed in the blended melt to form a state-stable blended melt, the melt is metered after further homogenization and stabilization, and the blended melt is continuously conveyed to a second-stage extruder;
3) Second-stage molding extrusion: the second-stage extruder adopts a single screw extruder with the tail end connected with a heat exchanger and a melt pump, the diameter of the screw is 90-200 mm, the length-diameter ratio is 26-34, the rotating speed of the screw is set to be 15-25 r/min, the melt pressure is 10-25 MPa, and the melt temperature is 160-200 ℃;
directly pushing the blended melt into a first-stage extruder, setting the temperature of three sections to be 160-200 ℃, the temperature of a heat exchanger and a melt pump to be 170-190 ℃, the temperature of a die head to be 160-180 ℃, the temperature of an outer lip of a neck ring die to be 110-130 ℃, the temperature of an inner lip of the neck ring die to be 105-125 ℃ and the pressure of the neck ring die to be 0.1-20 Mpa; gasifying a physical foaming agent in the blended melt through the decompression action of an annular die to form a uniform cell structure in the blended melt, forming a tubular fused blank, and continuously conveying the tubular fused blank to a cooling and shaping system;
4) Cooling and shaping system: the cooling shaping system adopts a composite cooling system consisting of an external air ring main cooling device and an internal circulating water auxiliary cooling device, and the air flow of the external air ring main cooling device is 0.1-5 m 3 Min, the flow of the circulating water of the internal circulating water auxiliary cooling device is 0.01-2 m 3 Min, shapingThe diameter of the device is 100-800 mm;
directly pushing the tubular molten blank into a second-stage extruder, setting the temperature of an air ring to be 10-25 ℃ and the temperature of circulating water to be 10-60 ℃; the tubular fused blank temperature is gradually reduced under the cooling action of the main cooling device of the annular outer air ring and the auxiliary cooling device of the internal circulating water, the resin is rapidly crystallized under the action of the nucleating agent, the internal cellular structure is rapidly shaped to form a tubular blank with uniform cells, and the tubular blank is continuously conveyed to a winding system;
5) A winding system: the winding system adopts an online cutting, flattening, static eliminating and tension controlling device, the traction speed of a main traction device is 5-500 m/min, the winding diameter is 0.5-2 m, and the winding width is 1-2 m;
directly pushing the tubular blank by a cooling and shaping system, setting the winding tension to be 100-700N, and performing online cutting, flattening and static elimination to obtain a finished product of the high-temperature-resistant polypropylene extrusion foaming sheet.
Compared with the prior art, the high-temperature-resistant polypropylene extrusion foaming sheet has excellent high-temperature resistance, the heat distortion temperature can reach more than 140 ℃, and the high-temperature-resistant polypropylene extrusion foaming sheet is suitable for manufacturing packages or containers for heating food or products needing high-temperature disinfection; good chemical stability, can be stably used for a long time under the condition of pH 2-12, and is suitable for manufacturing most acidic or alkaline products or containers; the oil and grease corrosion resistance is outstanding, the absorptivity to most of grease substances is less than 0.01 percent under the normal temperature condition (25 ℃), and the oil and grease corrosion resistance is suitable for the manufacture of the package or the container of fried and baked food or grease-containing products; the packaging adaptability is excellent, the adopted foaming process does not influence the heat sealing performance (the heat sealing temperature is 120-160 ℃), and the method is suitable for heat sealing packaging of various products or development of various composite materials on the basis of the heat sealing packaging; proper mechanical characteristics, tensile strength of more than 30MPa and impact strength of 3.0kJ/m 2 The method is suitable for manufacturing the packaging or the container with good impact resistance and vibration resistance.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the contents of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following detailed description is given in conjunction with the preferred embodiments.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below.
FIG. 1 is a diagram showing the heat distortion temperature when the foaming ratio of the high temperature resistant polypropylene extruded foamed sheet of the preferred embodiment of the present invention is 2, wherein (a) the filler is wollastonite; (b) the filling agent is barium sulfate; (c) the filler is wollastonite; the filling agent is calcium carbonate; (e) the filler is montmorillonite; (f) the filler is diatomite; (g) the filler is mica.
FIG. 2 is a graph of heat distortion temperature for a preferred embodiment of the present invention in which the high temperature resistant polypropylene extruded foam sheet filler is mica (a) having a mica loading of 0.1 parts (example 1); (b) mica loading 1 part (example 2); (c) mica loading 2 parts (example 3); (d) mica loading 5 parts (example 4); (e) 10 parts mica loading (example 5); (f) mica loading 20 parts (example 6).
FIG. 3 is a scanning electron microscope cross-sectional view of a high temperature resistant polypropylene extruded foam sheet according to preferred embodiment 1 of the present invention.
Detailed Description
Other aspects, features and advantages of the present invention will become apparent from the following detailed description, which, when considered in conjunction with the accompanying drawings, illustrate by way of example the principles of the invention.
Example 1
1) The components are mixed according to the mass ratio
Long chain branched high melt strength polypropylene: 80 parts of a mixture;
high crystalline homopolypropylene: 5 parts of a mixture;
TMB nucleating agent: 2 parts of (1);
low density polyethylene: 10 parts of (A);
mica: 0.1 part;
ethylene bis stearamide: 2 parts of (1);
antioxidant 1076:1 part;
fully mixing the raw materials by a high-speed mixer to obtain dry-mixed raw materials;
2) First-stage blending extrusion: the first-stage extruder adopts a single screw extruder with a mixing module, the diameter of the screw is 60mm, the length-diameter ratio is 28, the rotating speed of the screw is set to be 15r/min, the melt pressure is 15MPa, and the melt temperature is 180 ℃;
adding the obtained dry-mixed raw materials into a material feeding device, setting the temperature of a feeding section to be 150 ℃, the temperature of a melting section to be 170 ℃, the temperature of a mixing section to be 200 ℃, the temperature of a homogenizing section to be 200 ℃ and the temperature of a metering section to be 200 ℃; in a first-stage single-screw extruder, dry-mixed raw materials form a blended melt under the actions of melting, shearing and mixing, in the process, a foaming compatilizer is decomposed to release a small amount of gas after reaching the decomposition temperature, the blended melt with a plurality of micro compatibilization cores is formed, 2 parts of supercritical fluid carbon dioxide are introduced into a melting section, the blended melt is compatible with the compatibilization cores through mixing, a physical foaming agent is fully dispersed in the blended melt to form a state-stable blended melt, the melt is metered after further homogenization and stabilization, and the blended melt is continuously conveyed to a second-stage extruder;
3) Second-stage molding extrusion: the second-stage extruder adopts a single screw extruder with the tail end connected with a heat exchanger and a melt pump, the diameter of the screw is 90mm, the length-diameter ratio is 26, the rotating speed of the screw is set to be 15r/min, the melt pressure is 10MPa, and the melt temperature is 160 ℃;
directly pushing the blended melt by a first-stage extruder, setting the temperature of three sections to be 160 ℃, the temperature of a heat exchanger and a melt pump to be 170 ℃, the temperature of a die head to be 160 ℃, the temperature of an outer lip of a neck ring die to be 110 ℃, the temperature of an inner lip of the neck ring die to be 105 ℃ and the pressure of the neck ring die to be 0.1Mpa; gasifying a physical foaming agent in the blended melt through the decompression action of an annular die to form a uniform cell structure in the blended melt, forming a tubular fused blank, and continuously conveying the tubular fused blank to a cooling and shaping system;
4) Cooling and shaping system: the cooling shaping system adopts a composite cooling system consisting of an external air ring main cooling device and an internal circulating water auxiliary cooling device, and the air flow of the external air ring main cooling device is 0.1m 3 Min, internal circulating water auxiliary cooling deviceCirculating water flow of 0.01m 3 Min, the diameter of the shaping device is 100mm;
directly pushing the tubular molten blank into a second-stage extruder, and setting the temperature of a wind ring to be 10 ℃ and the temperature of circulating water to be 10 ℃; the tubular fused blank temperature is gradually reduced under the cooling action of the main cooling device of the annular outer air ring and the auxiliary cooling device of the internal circulating water, the resin is rapidly crystallized under the action of the nucleating agent, the internal cellular structure is rapidly shaped to form a tubular blank with uniform cells, and the tubular blank is continuously conveyed to a winding system;
5) A winding system: the winding system adopts an online cutting, flattening, static eliminating and tension control device, the traction speed of a main traction device is 5m/min, the winding diameter is 0.5m, and the winding width is 1m;
directly pushing the tubular blank by a cooling and shaping system, setting the winding tension to be 100N, and performing online cutting, flattening and static elimination to obtain a finished product of the high-temperature-resistant polypropylene extrusion foaming sheet.
Example 2
1) The components are mixed according to the mass ratio
Long chain branched high melt strength polypropylene: 75 parts of a mixture;
crystalline copolymerized polypropylene: 15 parts of (1);
WBG nucleating agent: 1.5 parts;
linear low density polyethylene: 5 parts of a mixture;
mica: 1 part;
stearamide: 1.5 parts;
antioxidant 1010:1 part;
fully mixing the raw materials by a high-speed mixer to obtain dry-mixed raw materials;
2) First-stage blending extrusion: the first-stage extruder adopts a single screw extruder with a mixing module, the diameter of the screw is 75mm, the length-diameter ratio is 28, the rotating speed of the screw is set to be 15r/min, the melt pressure is 15MPa, and the melt temperature is 180 ℃;
adding the obtained dry-mixed raw materials into a material feeding device, setting the temperature of a feeding section to be 150 ℃, the temperature of a melting section to be 170 ℃, the temperature of a mixing section to be 200 ℃, the temperature of a homogenizing section to be 200 ℃ and the temperature of a metering section to be 200 ℃; in a first-stage single-screw extruder, dry-mixed raw materials form a blended melt under the actions of melting, shearing and mixing, in the process, a foaming compatilizer is decomposed to release a small amount of gas after reaching the decomposition temperature, the blended melt with a plurality of micro compatibilization cores is formed, 2.5 parts of supercritical fluid type nitrogen is introduced into a melting section, the blended melt is compatible with the compatibilization cores through mixing, a physical foaming agent is fully dispersed in the blended melt to form a blended melt with a stable state, the blended melt is further homogenized and stabilized, then the melt is metered and is continuously conveyed to a second-stage extruder;
3) Second-stage molding extrusion: the second-stage extruder adopts a single screw extruder with the tail end connected with a heat exchanger and a melt pump, the diameter of the screw is 90mm, the length-diameter ratio is 26, the rotating speed of the screw is set to be 15r/min, the melt pressure is 10MPa, and the melt temperature is 160 ℃;
directly pushing the blended melt by a first-stage extruder, setting the temperature of three sections to be 160 ℃, the temperature of a heat exchanger and a melt pump to be 170 ℃, the temperature of a die head to be 160 ℃, the temperature of an outer lip of a neck ring die to be 110 ℃, the temperature of an inner lip of the neck ring die to be 105 ℃ and the pressure of the neck ring die to be 0.1Mpa; gasifying a physical foaming agent in the blended melt through the decompression action of an annular die to form a uniform cell structure in the blended melt, forming a tubular fused blank, and continuously conveying the tubular fused blank to a cooling and shaping system;
4) Cooling and shaping system: the cooling shaping system adopts a composite cooling system consisting of an external air ring main cooling device and an internal circulating water auxiliary cooling device, and the air flow of the external air ring main cooling device is 0.1m 3 Min, the flow of the circulating water of the internal circulating water auxiliary cooling device is 0.01m 3 Min, the diameter of the shaping device is 200mm;
directly pushing the tubular molten blank into a second-stage extruder, setting the temperature of an air ring to be 10-25 ℃ and the temperature of circulating water to be 10-60 ℃; the tubular fused blank temperature is gradually reduced under the cooling action of the main cooling device of the annular outer air ring and the auxiliary cooling device of the internal circulating water, the resin is rapidly crystallized under the action of the nucleating agent, the internal cellular structure is rapidly shaped to form a tubular blank with uniform cells, and the tubular blank is continuously conveyed to a winding system;
5) A winding system: the winding system adopts an online cutting, flattening, static eliminating and tension control device, the traction speed of a main traction device is 50m/min, the winding diameter is 0.5m, and the winding width is 1m;
and directly pushing the tubular blank by a cooling and shaping system, setting the winding tension to be 200N, and performing online cutting, flattening and static elimination to obtain a finished product of the high-temperature-resistant polypropylene extrusion foaming sheet.
Example 3
1) The components are mixed according to the mass ratio
Long chain branched high melt strength polypropylene: 70 parts of (B);
high crystalline homopolypropylene: 15 parts of a mixture;
high crystalline copolymerized polypropylene: 10 parts of (A);
n, N' -dicyclohexyl-2,6-naphthalamide: 0.01 part;
medium density polyethylene: 0.1 part;
mica: 2 parts of (1);
oleic acid amide: 2 parts of (1);
300, antioxidant: 1 part;
fully mixing the raw materials by a high-speed mixer to obtain dry-mixed raw materials;
2) First-stage blending extrusion: the first-stage extruder adopts a single-screw extruder with a mixing module, the diameter of a screw is 90mm, the length-diameter ratio is 28-36, the rotating speed of the screw is set to be 20r/min, the melt pressure is 25MPa, and the melt temperature is 200 ℃;
adding the obtained dry-mixed raw materials into a material device, setting the temperature of a feeding section to be 170 ℃, the temperature of a melting section to be 180 ℃, the temperature of a mixing section to be 220 ℃, the temperature of a homogenizing section to be 220 ℃ and the temperature of a metering section to be 220 ℃; in a first-stage single-screw extruder, dry-mixed raw materials form a blended melt under the actions of melting, shearing and mixing, in the process, a foaming compatilizer is decomposed to release a small amount of gas after reaching the decomposition temperature, the blended melt with a plurality of micro compatibilization cores is formed, 3 parts of helium in a supercritical fluid form is introduced into a melting section, the blended melt is compatible with the compatibilization cores through mixing, a physical foaming agent is fully dispersed in the blended melt to form a state-stable blended melt, the melt is metered after further homogenization and stabilization, and the blended melt is continuously conveyed to a second-stage extruder;
3) Second-stage molding extrusion: the second-stage extruder adopts a single screw extruder with the tail end connected with a heat exchanger and a melt pump, the diameter of a screw is 150mm, the length-diameter ratio is 32, the rotating speed of the screw is set to be 20r/min, the melt pressure is 20MPa, and the melt temperature is 180 ℃;
directly pushing the blended melt by a first-stage extruder, setting the temperature of three sections to be 190 ℃, the temperature of a heat exchanger and a melt pump to be 180 ℃, the temperature of a die head to be 170 ℃, the temperature of an outer lip of a port die to be 120 ℃, the temperature of an inner lip of the port die to be 115 ℃ and the pressure of the port die to be 10Mpa; gasifying a physical foaming agent in the blended melt through the decompression action of an annular die to form a uniform cell structure in the blended melt, forming a tubular fused blank, and continuously conveying the tubular fused blank to a cooling and shaping system;
4) Cooling and shaping system: the cooling shaping system adopts a composite cooling system consisting of an external air ring main cooling device and an internal circulating water auxiliary cooling device, and the air flow of the external air ring main cooling device is 3m 3 Min, the flow of the circulating water of the internal circulating water auxiliary cooling device is 1m 3 Min, the diameter of the shaping device is 300mm;
directly pushing the tubular molten blank into a second-stage extruder, and setting the temperature of a wind ring to be 15 ℃ and the temperature of circulating water to be 40 ℃; the tubular fused blank temperature is gradually reduced under the cooling action of the main cooling device of the annular outer air ring and the auxiliary cooling device of the internal circulating water, the resin is rapidly crystallized under the action of the nucleating agent, the internal cellular structure is rapidly shaped to form a tubular blank with uniform cells, and the tubular blank is continuously conveyed to a winding system;
5) A winding system: the winding system adopts an online cutting, flattening, static eliminating and tension control device, the traction speed of a main traction device is 150m/min, the winding diameter is 1m, and the winding width is 1.5m;
and directly pushing the tubular blank by a cooling and shaping system, setting the winding tension to be 300N, and performing online cutting, flattening and static elimination to obtain a finished product of the high-temperature-resistant polypropylene extrusion foaming sheet.
Example 4
1) The components are mixed according to the mass ratio
Long chain branched high melt strength polypropylene: 60 parts;
high crystalline homopolypropylene: 25 parts of a binder;
gamma-quinacridone: 1 part;
high density polyethylene: 5 parts of a mixture;
mica: 5 parts of a mixture;
calcium stearate: 2 parts of (1);
antioxidant 168:2 parts of a mixture;
fully mixing the raw materials by a high-speed mixer to obtain dry-mixed raw materials;
2) First-stage blending extrusion: the first-stage extruder adopts a single-screw extruder with a mixing module, the diameter of a screw is 120mm, the length-diameter ratio is 32, the rotating speed of the screw is set to be 20r/min, the melt pressure is 25MPa, and the melt temperature is 200 ℃;
adding the obtained dry-mixed raw materials into a material device, setting the temperature of a feeding section to be 170 ℃, the temperature of a melting section to be 180 ℃, the temperature of a mixing section to be 220 ℃, the temperature of a homogenizing section to be 220 ℃ and the temperature of a metering section to be 220 ℃; in a first-stage single-screw extruder, dry-mixed raw materials form a blended melt under the actions of melting, shearing and mixing, in the process, a foaming compatilizer is decomposed to release a small amount of gas after reaching the decomposition temperature, the blended melt with a plurality of micro compatibilization cores is formed, 4 parts of argon in a supercritical fluid form is introduced into a melting section, the compatibility with the compatibilization cores is realized through mixing, a physical foaming agent is fully dispersed in the blended melt to form a state-stable blended melt, the melt is metered after further homogenization and stabilization, and the blended melt is continuously conveyed to a second-stage extruder;
3) Second-stage molding extrusion: the second-stage extruder adopts a single screw extruder with the tail end connected with a heat exchanger and a melt pump, the diameter of a screw is 150mm, the length-diameter ratio is 32, the rotating speed of the screw is set to be 20r/min, the melt pressure is 15MPa, and the melt temperature is 180 ℃;
directly pushing the blended melt by a first-stage extruder, setting the temperature of three sections to be 190 ℃, the temperature of a heat exchanger and a melt pump to be 180 ℃, the temperature of a die head to be 170 ℃, the temperature of an outer lip of a port die to be 120 ℃, the temperature of an inner lip of the port die to be 115 ℃ and the pressure of the port die to be 10Mpa; gasifying a physical foaming agent in the blended melt through the decompression action of an annular die to form a uniform cell structure in the blended melt, forming a tubular fused blank, and continuously conveying the tubular fused blank to a cooling and shaping system;
4) Cooling and shaping system: the cooling shaping system adopts a composite cooling system consisting of an external air ring main cooling device and an internal circulating water auxiliary cooling device, and the air flow of the external air ring main cooling device is 3m 3 Min, the flow of the circulating water of the internal circulating water auxiliary cooling device is 1m 3 Min, the diameter of the shaping device is 400mm;
directly pushing the tubular molten blank into a second-stage extruder, and setting the temperature of an air ring to be 15 ℃ and the temperature of circulating water to be 40 ℃; the tubular fused blank temperature is gradually reduced under the cooling action of the main cooling device of the annular outer air ring and the auxiliary cooling device of the internal circulating water, the resin is rapidly crystallized under the action of the nucleating agent, the internal cellular structure is rapidly shaped to form a tubular blank with uniform cells, and the tubular blank is continuously conveyed to a winding system;
5) A winding system: the winding system adopts an online cutting, flattening, static eliminating and tension control device, the traction speed of a main traction device is 150m/min, the winding diameter is 1m, and the winding width is 1m;
and directly pushing the tubular blank by a cooling and shaping system, setting the winding tension to be 400N, and performing online cutting, flattening and static elimination to obtain a finished product of the high-temperature-resistant polypropylene extrusion foaming sheet.
Example 5
1) The components are mixed according to the mass ratio
Long chain branched high melt strength polypropylene: 50 parts of a binder;
high crystalline copolymerized polypropylene: 35 parts of (B);
triphendithiazine: 2 parts of (1);
ethylene-vinyl alcohol copolymer: 5 parts of a mixture;
mica: 7 parts;
zinc stearate: 1 part;
antioxidant 1076:0.01 part;
antioxidant 1010: 0.01-2 parts;
fully mixing the raw materials by a high-speed mixer to obtain dry-mixed raw materials;
2) First-stage blending extrusion: the first-stage extruder adopts a single screw extruder with a mixing module, the diameter of the screw is 150mm, the length-diameter ratio is 36, the rotating speed of the screw is set to be 25r/min, the melt pressure is 30MPa, and the melt temperature is 220 ℃;
adding the obtained dry-mixed raw materials into a material feeding device, setting the temperature of a feeding section to be 180 ℃, the temperature of a melting section to be 200 ℃, the temperature of a mixing section to be 240 ℃, the temperature of a homogenizing section to be 240 ℃ and the temperature of a metering section to be 240 ℃; in a first-stage single-screw extruder, dry-mixed raw materials form a blended melt under the actions of melting, shearing and mixing, in the process, a foaming compatilizer is decomposed to release a small amount of gas after reaching the decomposition temperature, so that the blended melt with a plurality of tiny capacity-increasing cores is formed, 2 parts of pentane and 3 parts of butane in the form of supercritical fluid are introduced into the melting section, the blended melt is compatible with the capacity-increasing cores through mixing, so that a physical foaming agent is fully dispersed in the blended melt, the blended melt in a stable state is formed, the melt is metered after further homogenization and stabilization, and the blended melt is continuously conveyed to a second-stage extruder;
3) Second-stage molding extrusion: the second-stage extruder adopts a single screw extruder with the tail end connected with a heat exchanger and a melt pump, the diameter of a screw is 200mm, the length-diameter ratio is 34, the rotating speed of the screw is set to be 25r/min, the melt pressure is 25MPa, and the melt temperature is 200 ℃;
directly pushing the blended melt into a first-stage extruder, setting the temperatures of three sections to be 200 ℃, the temperatures of a heat exchanger and a melt pump to be 190 ℃, the temperature of a die head to be 180 ℃, the temperature of an outer lip of a neck ring die to be 130 ℃, the temperature of an inner lip of the neck ring die to be 125 ℃ and the pressure of the neck ring die to be 20Mpa; gasifying a physical foaming agent in the blended melt through the decompression action of an annular neck mold to form a uniform cellular structure inside the blended melt, forming a tubular molten blank, and continuously conveying the tubular molten blank to a cooling and shaping system;
4) Cooling and shaping system: the cooling shaping system adopts a composite cooling system consisting of an external air ring main cooling device and an internal circulating water auxiliary cooling device, and the air flow of the external air ring main cooling device is 5m 3 Min, internal circulating water auxiliary cooling device circulating water flow 2m 3 Min, the diameter of the shaping device is 500mm;
directly pushing the tubular molten blank into a second-stage extruder, and setting the temperature of a wind ring to be 25 ℃ and the temperature of circulating water to be 60 ℃; the tubular fused blank temperature is gradually reduced under the cooling action of the main cooling device of the annular outer air ring and the auxiliary cooling device of the internal circulating water, the resin is rapidly crystallized under the action of the nucleating agent, the internal cellular structure is rapidly shaped to form a tubular blank with uniform cells, and the tubular blank is continuously conveyed to a winding system;
5) A winding system: the winding system adopts an online cutting, flattening, static eliminating and tension control device, the traction speed of a main traction device is 300m/min, the winding diameter is 2m, and the winding width is 1m;
directly pushing the tubular blank by a cooling and shaping system, setting the winding tension to be 500N, and performing online cutting, flattening and static elimination to obtain a finished product of the high-temperature-resistant polypropylene extrusion foaming sheet.
Example 6
1) The components are mixed according to the mass ratio
Long chain branched high melt strength polypropylene: 40 parts of a mixture;
high crystalline homo-polypropylene: 45 parts of (1);
anthracene: 2 parts of (1);
ethylene-acrylic acid copolymer: 0.1 part;
mica: 10 parts of (A);
high-boiling-point paraffin: 2 parts of (1);
antioxidant 1076:1 part;
fully mixing the raw materials by a high-speed mixer to obtain dry-mixed raw materials;
2) First-stage blending extrusion: the first-stage extruder adopts a single screw extruder with a mixing module, the diameter of the screw is 60mm, the length-diameter ratio is 36, the rotating speed of the screw is set to be 25r/min, the melt pressure is 30MPa, and the melt temperature is 220 ℃;
adding the obtained dry-mixed raw materials into a material feeding device, setting the temperature of a feeding section to be 180 ℃, the temperature of a melting section to be 200 ℃, the temperature of a mixing section to be 240 ℃, the temperature of a homogenizing section to be 240 ℃ and the temperature of a metering section to be 240 ℃; in a first-stage single-screw extruder, dry-mixed raw materials form a blended melt under the actions of melting, shearing and mixing, in the process, a foaming compatilizer is decomposed to release a small amount of gas after reaching the decomposition temperature, the blended melt with a plurality of micro compatibilization cores is formed, 2 parts of supercritical fluid carbon dioxide are introduced into a melting section, the blended melt is compatible with the compatibilization cores through mixing, a physical foaming agent is fully dispersed in the blended melt to form a state-stable blended melt, the melt is metered after further homogenization and stabilization, and the blended melt is continuously conveyed to a second-stage extruder;
3) Second-stage molding extrusion: the second-stage extruder adopts a single screw extruder with the tail end connected with a heat exchanger and a melt pump, the diameter of a screw is 90mm, the length-diameter ratio is 34, the rotating speed of the screw is set to be 25r/min, the melt pressure is 25MPa, and the melt temperature is 200 ℃;
directly pushing the blended melt by a first-stage extruder, setting the temperature of three sections to be 200 ℃, the temperature of a heat exchanger and a melt pump to be 190 ℃, the temperature of a die head to be 180 ℃, the temperature of an outer lip of a port die to be 130 ℃, the temperature of an inner lip of the port die to be 125 ℃ and the pressure of the port die to be 20Mpa; gasifying a physical foaming agent in the blended melt through the decompression action of an annular die to form a uniform cell structure in the blended melt, forming a tubular fused blank, and continuously conveying the tubular fused blank to a cooling and shaping system;
4) Cooling and shaping system: the cooling shaping system adopts a composite cooling system consisting of an external air ring main cooling device and an internal circulating water auxiliary cooling device, and the air flow of the external air ring main cooling device is 5m 3 Min, internal circulating water auxiliary cooling device circulating water flow 2m 3 Min, the diameter of the shaping device is 600mm;
directly pushing the tubular molten blank into a second-stage extruder, and setting the temperature of a wind ring to be 25 ℃ and the temperature of circulating water to be 60 ℃; the temperature of the tubular molten blank is gradually reduced under the cooling action of the annular external air ring main cooling device and the internal circulating water auxiliary cooling device, the resin is quickly crystallized under the action of the nucleating agent, the internal cellular structure is quickly shaped to form a tubular blank with uniform cells, and the tubular blank is continuously conveyed to a winding system;
5) A winding system: the winding system adopts an online cutting, flattening, static eliminating and tension control device, the traction speed of a main traction device is 500m/min, the winding diameter is 2m, and the winding width is 2m;
and directly pushing the tubular blank by a cooling and shaping system, setting the winding tension to be 600N, and performing online cutting, flattening and static elimination to obtain a finished product of the high-temperature-resistant polypropylene extrusion foaming sheet.
Example 7
1) The components are mixed according to the mass ratio
Long chain branched high melt strength polypropylene: 50 parts of a mixture;
high crystalline copolymerized polypropylene: 45 parts of (1);
phenanthrene: 2 parts of (1);
low density polyethylene: 0.1 part;
diatomite: 1 part;
microcrystalline paraffin: 1 part;
antioxidant 1010:1 part;
fully mixing the raw materials by a high-speed mixer to obtain dry-mixed raw materials;
2) First-stage blending extrusion: the first-stage extruder adopts a single screw extruder with a mixing module, the diameter of the screw is 75mm, the length-diameter ratio is 28, the rotating speed of the screw is set to be 15r/min, the melt pressure is 15MPa, and the melt temperature is 180 ℃;
adding the obtained dry-mixed raw materials into a material feeding device, setting the temperature of a feeding section to be 150 ℃, the temperature of a melting section to be 170 ℃, the temperature of a mixing section to be 200 ℃, the temperature of a homogenizing section to be 200 ℃ and the temperature of a metering section to be 200 ℃; in a first-stage single-screw extruder, dry-mixed raw materials form a blended melt under the actions of melting, shearing and mixing, in the process, a foaming compatilizer is decomposed to release a small amount of gas after reaching the decomposition temperature, so that the blended melt with a plurality of tiny compatibilization cores is formed, 2.5 parts of supercritical fluid carbon dioxide is introduced into the melting section, the blended melt is compatible with the compatibilization cores through mixing, so that a physical foaming agent is fully dispersed in the blended melt to form a stable blended melt, the blended melt is further homogenized and stabilized, then the melt is metered, and is continuously conveyed to a second-stage extruder;
3) Second-stage molding extrusion: the second-stage extruder adopts a single screw extruder with the tail end connected with a heat exchanger and a melt pump, the diameter of the screw is 90mm, the length-diameter ratio is 26, the rotating speed of the screw is set to be 15r/min, the melt pressure is 10MPa, and the melt temperature is 160 ℃;
directly pushing the blended melt by a first-stage extruder, setting the temperature of three sections to be 160 ℃, the temperature of a heat exchanger and a melt pump to be 170 ℃, the temperature of a die head to be 160 ℃, the temperature of an outer lip of a neck ring die to be 110 ℃, the temperature of an inner lip of the neck ring die to be 105 ℃ and the pressure of the neck ring die to be 0.1Mpa; gasifying a physical foaming agent in the blended melt through the decompression action of an annular die to form a uniform cell structure in the blended melt, forming a tubular fused blank, and continuously conveying the tubular fused blank to a cooling and shaping system;
4) Cooling and shaping system: the cooling shaping system adopts a composite cooling system consisting of an external air ring main cooling device and an internal circulating water auxiliary cooling device, and the air flow of the external air ring main cooling device is 0.1m 3 Permin, the flow of the circulating water of the internal circulating water auxiliary cooling device is 0.01m 3 Min, the diameter of the shaping device is 800mm;
directly pushing the tubular molten blank into a second-stage extruder, and setting the temperature of a wind ring to be 10 ℃ and the temperature of circulating water to be 10 ℃; the tubular fused blank temperature is gradually reduced under the cooling action of the main cooling device of the annular outer air ring and the auxiliary cooling device of the internal circulating water, the resin is rapidly crystallized under the action of the nucleating agent, the internal cellular structure is rapidly shaped to form a tubular blank with uniform cells, and the tubular blank is continuously conveyed to a winding system;
5) A winding system: the winding system adopts an online cutting, flattening, static eliminating and tension control device, the traction speed of a main traction device is 300m/min, the winding diameter is 1m, and the winding width is 1.5m;
and directly pushing the tubular blank by a cooling and shaping system, setting the winding tension to be 700N, and performing online cutting, flattening and static elimination to obtain a finished product of the high-temperature-resistant polypropylene extrusion foaming sheet.
Example 8
1) The components are mixed according to the mass ratio
Long chain branched high melt strength polypropylene: 60 parts;
high crystalline homopolypropylene: 15 parts of (1);
high crystalline copolymerized polypropylene: 10 parts of a binder;
and (2) diphenylamine vulcanization: 1 part;
linear low density polyethylene: 10 parts of (A);
montmorillonite: 1 part;
calcium carbonate: 1 part;
fatty acid: 1 part;
300, antioxidant: 1 part;
fully mixing the raw materials by a high-speed mixer to obtain dry-mixed raw materials;
2) First-stage blending extrusion: the first-stage extruder adopts a single-screw extruder with a mixing module, the diameter of a screw is 90mm, the length-diameter ratio is 28, the rotating speed of the screw is set to be 15r/min, the melt pressure is 15MPa, and the melt temperature is 180 ℃;
adding the obtained dry-mixed raw materials into a material feeding device, setting the temperature of a feeding section to be 150 ℃, setting the temperature of a melting section to be 170 ℃, setting the temperature of a mixing section to be 200 ℃, setting the temperature of a homogenizing section to be 200 ℃, and setting the temperature of a metering section to be 200 ℃; in a first-stage single-screw extruder, dry-mixed raw materials form a blended melt under the actions of melting, shearing and mixing, in the process, a foaming compatilizer is decomposed to release a small amount of gas after reaching the decomposition temperature, so that the blended melt with a plurality of micro compatibilization cores is formed, 2 parts of nitrogen and 1 part of helium in the form of supercritical fluid are introduced into a melting section, the blended melt is compatible with the compatibilization cores through mixing, so that a physical foaming agent is fully dispersed in the blended melt to form a state-stable blended melt, the melt is metered after further homogenization and stabilization, and the blended melt is continuously conveyed to a second-stage extruder;
3) Second-stage molding extrusion: the second-stage extruder adopts a single screw extruder with the tail end connected with a heat exchanger and a melt pump, the diameter of the screw is 90mm, the length-diameter ratio is 26, the rotating speed of the screw is set to be 15r/min, the melt pressure is 10MPa, and the melt temperature is 160 ℃;
directly pushing the blended melt by a first-stage extruder, setting the temperature of three sections to be 160 ℃, the temperature of a heat exchanger and a melt pump to be 170 ℃, the temperature of a die head to be 160 ℃, the temperature of an outer lip of a neck ring die to be 110 ℃, the temperature of an inner lip of the neck ring die to be 105 ℃ and the pressure of the neck ring die to be 5Mpa; gasifying a physical foaming agent in the blended melt through the decompression action of an annular die to form a uniform cell structure in the blended melt, forming a tubular fused blank, and continuously conveying the tubular fused blank to a cooling and shaping system;
4) Cooling and shaping system: the cooling shaping system adopts a composite cooling system consisting of an external air ring main cooling device and an internal circulating water auxiliary cooling device, and the air flow of the external air ring main cooling device is 1m 3 Min, the flow of the circulating water of the internal circulating water auxiliary cooling device is 1m 3 Min, the diameter of the shaping device is 500mm;
directly pushing the tubular molten blank into a second-stage extruder, and setting the temperature of a wind ring to be 10 ℃ and the temperature of circulating water to be 10 ℃; the tubular fused blank temperature is gradually reduced under the cooling action of the main cooling device of the annular outer air ring and the auxiliary cooling device of the internal circulating water, the resin is rapidly crystallized under the action of the nucleating agent, the internal cellular structure is rapidly shaped to form a tubular blank with uniform cells, and the tubular blank is continuously conveyed to a winding system;
5) A winding system: the winding system adopts an online cutting, flattening, static eliminating and tension control device, the traction speed of a main traction device is 300m/min, the winding diameter is 1m, and the winding width is 2m;
and directly pushing the tubular blank by a cooling and shaping system, setting the winding tension to be 500N, and performing online cutting, flattening and static elimination to obtain a finished product of the high-temperature-resistant polypropylene extrusion foaming sheet.
Example 9
1) The components are mixed according to the mass ratio
Long chain branched high melt strength polypropylene: 70 parts of (B);
high crystalline homopolypropylene: 15 parts of (1);
pimelic acid: 1 part;
high density polyethylene: 5 parts of a mixture;
talc powder: 3 parts of a mixture;
barium sulfate: 2 parts of (1);
wollastonite: 2 parts of (1);
calcium stearate: 0.5 part;
zinc stearate: 0.5 part;
antioxidant 168:1 part;
fully mixing the raw materials by a high-speed mixer to obtain dry-mixed raw materials;
2) First-stage blending extrusion: the first-stage extruder adopts a single screw extruder with a mixing module, the diameter of the screw is 120mm, the length-diameter ratio is 36, the rotating speed of the screw is set to be 25r/min, the melt pressure is 30MPa, and the melt temperature is 220 ℃;
adding the obtained dry-mixed raw materials into a material feeding device, setting the temperature of a feeding section to be 180 ℃, the temperature of a melting section to be 200 ℃, the temperature of a mixing section to be 240 ℃, the temperature of a homogenizing section to be 240 ℃ and the temperature of a metering section to be 240 ℃; in a first-stage single-screw extruder, dry-mixed raw materials form a blended melt under the actions of melting, shearing and mixing, in the process, a foaming compatilizer is decomposed to release a small amount of gas after reaching the decomposition temperature, the blended melt with a plurality of micro compatibilization cores is formed, 4 parts of pentane in a supercritical fluid form is introduced into a melting section, the pentane is compatible with the compatibilization cores through mixing, a physical foaming agent is fully dispersed in the blended melt to form a state-stable blended melt, the melt is metered after further homogenization and stabilization, and the blended melt is continuously conveyed to a second-stage extruder;
3) Second-stage molding extrusion: the second-stage extruder adopts a single screw extruder with the tail end connected with a heat exchanger and a melt pump, the diameter of a screw is 200mm, the length-diameter ratio is 34, the rotating speed of the screw is set to be 25r/min, the melt pressure is 25MPa, and the melt temperature is 200 ℃;
directly pushing the blended melt by a first-stage extruder, setting the temperature of three sections to be 200 ℃, the temperature of a heat exchanger and a melt pump to be 190 ℃, the temperature of a die head to be 180 ℃, the temperature of an outer lip of a port die to be 130 ℃, the temperature of an inner lip of the port die to be 125 ℃ and the pressure of the port die to be 15Mpa; gasifying a physical foaming agent in the blended melt through the decompression action of an annular die to form a uniform cell structure in the blended melt, forming a tubular fused blank, and continuously conveying the tubular fused blank to a cooling and shaping system;
4) Cooling and shaping system: the cooling shaping system adopts a composite cooling system consisting of an external air ring main cooling device and an internal circulating water auxiliary cooling device, and the air flow of the external air ring main cooling device is 3m 3 Min, the flow of the circulating water of the internal circulating water auxiliary cooling device is 1m 3 Min, the diameter of the shaping device is 200mm;
directly pushing the tubular molten blank into a second-stage extruder, setting the temperature of an air ring to be 25 ℃ and the temperature of circulating water to be 40 ℃; the tubular fused blank temperature is gradually reduced under the cooling action of the main cooling device of the annular outer air ring and the auxiliary cooling device of the internal circulating water, the resin is rapidly crystallized under the action of the nucleating agent, the internal cellular structure is rapidly shaped to form a tubular blank with uniform cells, and the tubular blank is continuously conveyed to a winding system;
5) A winding system: the winding system adopts an online cutting, flattening, static eliminating and tension control device, the traction speed of a main traction device is 200m/min, the winding diameter is 2m, and the winding width is 1m;
and directly pushing the tubular blank by a cooling and shaping system, setting the winding tension to be 500N, and performing online cutting, flattening and static elimination to obtain a finished product of the high-temperature-resistant polypropylene extrusion foaming sheet.
Example 10
1) The components are mixed according to the mass ratio
Long chain branched high melt strength polypropylene: 70 parts of (B);
high crystalline copolymerized polypropylene: 5 parts of a mixture;
calcium stearate: 2 parts of (1);
low density polyethylene: 5 parts of a mixture;
linear low density polyethylene: 5 parts of a mixture;
silicon dioxide: 5 parts of a mixture;
titanium dioxide: 5 parts of a mixture;
ethylene bis stearamide: 1 part;
stearamide: 1 part;
300, antioxidant: 0.5 part;
antioxidant 168:0.5 part;
fully mixing the raw materials by a high-speed mixer to obtain dry-mixed raw materials;
2) First-stage blending extrusion: the first-stage extruder adopts a single screw extruder with a mixing module, the diameter of the screw is 150mm, the length-diameter ratio is 36, the rotating speed of the screw is set to be 25r/min, the melt pressure is 30MPa, and the melt temperature is 220 ℃;
adding the obtained dry-mixed raw materials into a material feeding device, setting the temperature of a feeding section to be 180 ℃, the temperature of a melting section to be 200 ℃, the temperature of a mixing section to be 240 ℃, the temperature of a homogenizing section to be 240 ℃ and the temperature of a metering section to be 240 ℃; in a first-stage single-screw extruder, dry-mixed raw materials form a blended melt under the actions of melting, shearing and mixing, in the process, a foaming compatilizer is decomposed to release a small amount of gas after reaching the decomposition temperature, the blended melt with a plurality of micro compatibilization cores is formed, 5 parts of butane in a supercritical fluid form is introduced into a melting section, the compatibility with the compatibilization cores is realized through mixing, a physical foaming agent is fully dispersed in the blended melt to form a state-stable blended melt, the melt is metered after further homogenization and stabilization, and the melt is continuously conveyed to a second-stage extruder;
3) Second-stage molding extrusion: the second-stage extruder adopts a single screw extruder with the tail end connected with a heat exchanger and a melt pump, the diameter of a screw is 200mm, the length-diameter ratio is 34, the rotating speed of the screw is set to be 25r/min, the melt pressure is 25MPa, and the melt temperature is 200 ℃;
directly pushing the blended melt into a first-stage extruder, setting the temperature of three sections to be 200 ℃, the temperature of a heat exchanger and a melt pump to be 190 ℃, the temperature of a die head to be 180 ℃, the temperature of an outer lip of a port die to be 110-130 ℃, the temperature of an inner lip of the port die to be 125 ℃ and the pressure of the port die to be 20Mpa; gasifying a physical foaming agent in the blended melt through the decompression action of an annular die to form a uniform cell structure in the blended melt, forming a tubular fused blank, and continuously conveying the tubular fused blank to a cooling and shaping system;
4) Cooling and shaping system: the cooling shaping system adopts a composite cooling system consisting of an external air ring main cooling device and an internal circulating water auxiliary cooling device, and the air flow of the external air ring main cooling device is 5m 3 Permin, the flow of circulating water of the internal circulating water auxiliary cooling device is 2m 3 Min, the diameter of the shaping device is 100mm;
directly pushing the tubular molten blank into a second-stage extruder, and setting the temperature of a wind ring to be 25 ℃ and the temperature of circulating water to be 60 ℃; the tubular fused blank temperature is gradually reduced under the cooling action of the main cooling device of the annular outer air ring and the auxiliary cooling device of the internal circulating water, the resin is rapidly crystallized under the action of the nucleating agent, the internal cellular structure is rapidly shaped to form a tubular blank with uniform cells, and the tubular blank is continuously conveyed to a winding system;
5) A winding system: the winding system adopts an online cutting, flattening, static eliminating and tension control device, the traction speed of a main traction device is 300m/min, the winding diameter is 2m, and the winding width is 1m;
and directly pushing the tubular blank by a cooling and shaping system, setting the winding tension to be 700N, and performing online cutting, flattening and static elimination to obtain a finished product of the high-temperature-resistant polypropylene extrusion foaming sheet.
While the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.

Claims (10)

1. A high-temperature-resistant polypropylene extrusion foaming sheet comprises the following components in parts by mass:
long chain branched high melt strength polypropylene: 40-80 parts;
high crystalline polypropylene: 5-45 parts;
beta-crystal form nucleating agent: 0.01-2 parts;
wherein, the long-chain branched chain type high melt strength polypropylene has the branched chain carbon number of 10-30, the melt strength of 20-70 cN and the melting temperature of 160-240 ℃;
the high-temperature-resistant polypropylene extrusion foaming sheet has a uniform foam cell structure, the thickness of the high-temperature-resistant polypropylene extrusion foaming sheet is 0.5-3 mm, and the apparent density of the high-temperature-resistant polypropylene extrusion foaming sheet is 50-500 kg/m 3 The expansion ratio is 2 to 20.
2. The high temperature resistant polypropylene extruded foamed sheet according to claim 1, wherein: the high-crystalline polypropylene is one or a mixture of more of high-crystalline homo-polypropylene and high-crystalline co-polypropylene, the crystallinity is 65-75%, and the melting temperature is 160-240 ℃.
3. The high temperature resistant polypropylene extruded foamed sheet according to claim 1, wherein: the beta-crystal nucleating agent is one or a mixture of more of TMB nucleating agent, WBG nucleating agent, N' -dicyclohexyl-2,6-naphthalimide, gamma-quinacridone, triphendithiazine, anthracene, phenanthrene, vulcanized diphenylamine, pimelic acid, calcium stearate and derivatives.
4. The high temperature resistant polypropylene extruded foamed sheet according to claim 1, wherein: the high-temperature-resistant polypropylene extrusion foaming sheet further comprises the following components: polyethylene resin: 0.1-10 parts; physical foaming agent: 2-5 parts; filling agent: 0.1-10 parts; lubricant: 0.01-2 parts; antioxidant: 0.01 to 2 portions.
5. The high temperature resistant polypropylene extruded foamed sheet according to claim 4, wherein: the polyethylene resin is one or a mixture of a plurality of low-density polyethylene, linear low-density polyethylene, medium-density polyethylene, high-density polyethylene, ethylene-vinyl alcohol copolymer and ethylene-acrylic acid copolymer, the melt strength is 20-40 cN, the melting temperature is 155-195 ℃, and the polydispersity index is 7.0-8.5.
6. The high temperature resistant polypropylene extruded foamed sheet according to claim 4, wherein: the physical foaming agent is one or a mixture of more of carbon dioxide, nitrogen, helium, argon, pentane and butane in a supercritical fluid state.
7. The high temperature resistant polypropylene extruded foamed sheet according to claim 4, wherein: the filler is one or a mixture of mica, diatomite, montmorillonite, calcium carbonate, talcum powder, barium sulfate, wollastonite, silicon dioxide and titanium dioxide.
8. The high temperature resistant polypropylene extruded foamed sheet according to claim 4, wherein: the lubricant is one or a mixture of more of ethylene bis stearamide, oleamide, calcium stearate, zinc stearate, high boiling paraffin, microcrystalline paraffin and fatty acid.
9. The high temperature resistant polypropylene extruded foamed sheet according to claim 4, wherein: the antioxidant is one or a mixture of more of antioxidant 1076, antioxidant 1010, antioxidant 300 and antioxidant 168.
10. The production method of the high temperature resistant polypropylene extrusion foaming sheet according to the claims 1 to 9, comprises the following process steps:
1) Fully mixing the components except the physical foaming agent according to the mass ratio by a high-speed mixer to obtain dry-mixed raw materials;
2) First-stage blending extrusion: the first-stage extruder adopts a single screw extruder with a mixing module, the diameter of the screw is 60-150 mm, the length-diameter ratio is 28-36, the rotating speed of the screw is set to be 15-25 r/min, the melt pressure is 15-30 MPa, and the melt temperature is 180-220 ℃;
adding the obtained dry-mixed raw materials into a material feeding device, setting the temperature of a feeding section to be 150-180 ℃, setting the temperature of a melting section to be 170-200 ℃, setting the temperature of a mixing section to be 200-240 ℃, setting the temperature of a homogenizing section to be 200-240 ℃ and setting the temperature of a metering section to be 200-240 ℃; in a first-stage single-screw extruder, dry-mixed raw materials form a blended melt under the actions of melting, shearing and mixing, in the process, a foaming compatilizer is decomposed to release a small amount of gas after reaching the decomposition temperature, the blended melt with a plurality of micro compatibilization cores is formed, a supercritical fluid physical foaming agent is introduced into a melting section, the physical foaming agent is compatible with the compatibilization cores through mixing, the physical foaming agent is fully dispersed in the blended melt to form a state-stable blended melt, the melt is metered after further homogenization and stabilization, and the blended melt is continuously conveyed to a second-stage extruder;
3) Second-stage molding extrusion: the second-stage extruder adopts a single screw extruder with the tail end connected with a heat exchanger and a melt pump, the diameter of the screw is 90-200 mm, the length-diameter ratio is 26-34, the rotating speed of the screw is set to be 15-25 r/min, the melt pressure is 10-25 MPa, and the melt temperature is 160-200 ℃;
directly pushing the blended melt into a first-stage extruder, setting the temperature of three sections to be 160-200 ℃, the temperature of a heat exchanger and a melt pump to be 170-190 ℃, the temperature of a die head to be 160-180 ℃, the temperature of an outer lip of a neck ring die to be 110-130 ℃, the temperature of an inner lip of the neck ring die to be 105-125 ℃ and the pressure of the neck ring die to be 0.1-20 Mpa; gasifying a physical foaming agent in the blended melt through the decompression action of an annular die to form a uniform cell structure in the blended melt, forming a tubular fused blank, and continuously conveying the tubular fused blank to a cooling and shaping system;
4) Cooling and shaping system: the cooling shaping system adopts a composite cooling system consisting of an external air ring main cooling device and an internal circulating water auxiliary cooling device, and the air flow of the external air ring main cooling device is 0.1-5 m 3 Min, the flow of the circulating water of the internal circulating water auxiliary cooling device is 0.01-2 m 3 Min, the diameter of the shaping device is 100-800 mm;
directly pushing the tubular molten blank into a second-stage extruder, setting the temperature of an air ring to be 10-25 ℃ and the temperature of circulating water to be 10-60 ℃; the tubular fused blank temperature is gradually reduced under the cooling action of the main cooling device of the annular outer air ring and the auxiliary cooling device of the internal circulating water, the resin is rapidly crystallized under the action of the nucleating agent, the internal cellular structure is rapidly shaped to form a tubular blank with uniform cells, and the tubular blank is continuously conveyed to a winding system;
5) A winding system: the winding system adopts an online cutting, flattening, static eliminating and tension controlling device, the traction speed of a main traction device is 5-500 m/min, the winding diameter is 0.5-2 m, and the winding width is 1-2 m;
directly pushing the tubular blank by a cooling and shaping system, setting the winding tension to be 100-700N, and performing online cutting, flattening and static elimination to obtain a finished product of the high-temperature-resistant polypropylene extrusion foaming sheet.
CN202211199164.2A 2022-09-29 2022-09-29 High-temperature-resistant polypropylene extrusion foaming sheet and preparation method thereof Pending CN115536937A (en)

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Publication number Priority date Publication date Assignee Title
CN103360682A (en) * 2013-07-09 2013-10-23 顾建生 Heat-insulated degradable polypropylene foaming material and production method thereof
CN103890079A (en) * 2011-08-31 2014-06-25 比瑞塑料公司 Polymeric material for an insulated container
CN107286475A (en) * 2017-08-03 2017-10-24 天津市大林新材料科技股份有限公司 A kind of PP foam material and preparation method thereof

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Publication number Priority date Publication date Assignee Title
CN103890079A (en) * 2011-08-31 2014-06-25 比瑞塑料公司 Polymeric material for an insulated container
CN103360682A (en) * 2013-07-09 2013-10-23 顾建生 Heat-insulated degradable polypropylene foaming material and production method thereof
CN107286475A (en) * 2017-08-03 2017-10-24 天津市大林新材料科技股份有限公司 A kind of PP foam material and preparation method thereof

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