CN105820456A - Polystyrene/polyether blended high-dimensional stability extruded sheet and preparation method thereof - Google Patents
Polystyrene/polyether blended high-dimensional stability extruded sheet and preparation method thereof Download PDFInfo
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
- C08L25/02—Homopolymers or copolymers of hydrocarbons
- C08L25/04—Homopolymers or copolymers of styrene
- C08L25/06—Polystyrene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0012—Combinations of extrusion moulding with other shaping operations combined with shaping by internal pressure generated in the material, e.g. foaming
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/14—Applications used for foams
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2310/00—Masterbatches
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
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Abstract
The invention discloses a polystyrene/polyether blended high-dimensional stability extruded sheet. The polystyrene/polyether blended high-dimensional stability extruded sheet is prepared from a novel polystyrene material, a polystyrene recovery dark brown material, a polystyrene recovery white material, polyether, styrene-sodium acrylate, hydrotalcite, decabromodiphenyl ether, zinc borate, color master batch, tert-butyl peroxybenzoate, benzoyl peroxide, polyethylene grafted zinc maleate and a foaming agent. The invention further provides a preparation method of the polystyrene/polyether blended high-dimensional stability extruded sheet to obtain the extruded sheet with the good performance. The recovery material is matched with the novel polystyrene material to prepare the extruded sheet with the high strength, the production cost is greatly lowered, and the extruded sheet has the better performance than ordinary wastes for solving the recovery material chain scission problem; a polyether auxiliary material and a proper number of a solubilizing agent and other additives are added, the product tenacity is improved, and the material dimensional stability is improved while the problem that an existing product is brittle in quality and likely to be broken is solved; the obtained sheet is high in strength, good in flame retardance and good in heat insulation effect.
Description
Technical field
The present invention relates to a kind of extruded sheet, be specifically related to blended high-dimensional stability extruded sheet of a kind of polystyrene/polyethers and preparation method thereof.
Background technology
On market, existing external-wall heat-insulation material mainly uses and changes benzene plate, extruded sheet and polyurethane, wherein benzene plate is generally the least expensive, heat insulation effect is general, can absorb water and deform, need after finishing heat-insulation layer to do that some other waterproof to wait measure extruded sheet to compare benzene plate the most a lot, thermal conductivity ratio benzene plate is low, the little higher polyurethane of price is the one that inside existing insulation material, performance is best, the insulation material in the fields such as refrigerator freezer is exactly polyurethane, heat conductivity is well below benzene plate and extruded sheet, the polyurethane insulation coating of substantially one half thickness just can reach benzene plate and the heat insulation effect of extruded sheet original thickness, but price exceeds much than benzene plate and extruded sheet；The heat-insulation and heat-preservation of extruded sheet is strong, crushing resistance strong, energy is moistureproof, and environmental protection；The intensity of extruded sheet itself is higher, thus causes sheet material more crisp, the most pliable, easily makes sheet material damage, ftractures；Poor air permeability and the shortcoming such as price is higher.Polystyrene plastics is a kind of general-purpose plastics having many uses, application is broadly divided into injection-molded item, extruded product and foamed product three major types, and polystyrene plastics goods are because of its low raw-material cost, excellent performance, of many uses and develop quickly, the most occupied foam article prostatitis.At present, more polystyrene plastics goods, i.e. it is rejected with rear, the quantity of refuse formed is bigger, cause more serious white pollution problems, and these white pollution sources can not be from degraded, if white pollution problems to be solved is accomplished by these waste or used plastics are carried out recycling.
The polystyrene waste plastic reclaimed, it is generally required to through hot melt, filter, decolour, recrystallization, the step such as pelletize, this step is easily caused molecule chain break, use the polystyrene after these chain ruptures to reclaim dark brown material and be directly used in wallboard production, its product strength obtained is relatively low, properties of product are more inferior, do not reach preferably recovering effect.
Summary of the invention
Goal of the invention: present invention aim at for the deficiencies in the prior art, it is provided that a kind of intensity is high, good heat insulating and have high-dimensional stability extruded sheet that the polystyrene/polyethers of anti-flammability is blended and preparation method thereof.
Technical scheme: the high-dimensional stability extruded sheet that polystyrene/polyethers of the present invention is blended, including following component:
Preferably, the high-dimensional stability extruded sheet that described polystyrene/polyethers is blended, including following component:
Preferably, the carrier of described Masterbatch is perfluoroethylene-propylene.
The present invention also provides for the high-dimensional stability extruded sheet that above-mentioned polystyrene/polyethers is blended, and comprises the steps:
(1) polystyrene through desolventing technology is reclaimed dark brown material, polystyrene reclaims DABAI material and adds in batch mixer, 150～200 DEG C it are heated under logical condition of nitrogen gas, and stop stirring after adding benzoyl peroxide butyl ester and benzoyl peroxide, mix homogeneously insulated and stirred 2～5h and be cooled to 50～80 DEG C；
(2) add polystyrene virgin material in the system in step (1), polystyrene reclaims DABAI material, polytrimethylene ether, Masterbatch and polycthylene grafted MALEIC ACID, ZINC SALT, 200～250 DEG C it are again heated under logical condition of nitrogen gas, by mix homogeneously insulated and stirred 1～2.5h, add deca-BDE, Firebrake ZB, Styrene And Chloroalkyl Acrylates sodium and magnesium aluminum-hydrotalcite and continue stirring 0.5～1.5h；After being lowered the temperature by system temperature, pelletize processes；
(3) pellet step (2) obtained is sent in the feeding chamber of extruding machine, and injects foaming agent, carries out extrusion moulding；
(4) being transmitted through several jockey pulleys by the extruded sheet exported by extruding machine, and lower the temperature in transmitting procedure, cooling rate remains 2～5 DEG C/S, is dried and trimming processes.
Preferably, described extruding machine is divided into a double screw extruder and No. two double screw extruders；A described double screw extruder is divided into 12 working regions, and by charging aperture, the temperature of each working region is set as 190～195 DEG C, 195～205 DEG C, 195～205 DEG C, 200～210 DEG C, 235～245 DEG C, 205～215 DEG C, 215～225 DEG C, 215～225 DEG C, 235～245 DEG C, 225～235 DEG C, 205～215 DEG C and 205～215 DEG C successively；Described No. two double screw extruders are divided into 9 each working regions, and by feed end, the first seven is set as 195～205 DEG C with the temperature of the 9th working region, and the temperature of the 8th working region is set as 205～215 DEG C.
Preferably, 150～220rpm, the screw speed of No. two single screw extrusion machines is 8～20rpm, and the material mouth pressure of No. two single screw extrusion machines is 8～20MPa.
Preferably, in step (3), foaming agent injects in the 6th working region of a described double screw extruder.
Preferably, described in step (3), during extrusion moulding, top board temperature controls is 60～100 DEG C, and it is 60～100 DEG C that lower platen temperature controls.
Beneficial effect: (1) present invention uses reclaimed materials collocation polystyrene virgin material to prepare the extruded sheet of high intensity, greatly reduce production cost, reclaimed materials processing procedure can occur the problem that chain is disconnected, by adding peroxidized t-butyl perbenzoate and benzoyl peroxide dual-component catalyst first to reclaimed materials process in the present invention, the chain disconnected is promoted again to increase, making it have ratio general reclaimed materials preferably quality, production cost is low improves product strength simultaneously reducing；(2) extruded sheet is with the polystyrene containing phenyl ring as major ingredient, the extruded sheet obtained generally there are that matter is crisp, the problem of frangibility, the present invention is by with polystyrene as major ingredient, with polytrimethylene ether as adjuvant, add suitable solubilizing agent and other additives, improve the toughness of product, solve that matter is crisp, the problem of frangibility, improve the dimensional stability of material simultaneously；(3) preparation method that the present invention provides selects suitable mixture temperature and screw speed, reduce the shear heat between screw speed and raw material, thus increase the density of sheet material；Under the conditions of low screw speed, inject foaming agent simultaneously, contribute to generating Guan Bi abscess, reduce cell density, improve sheet material hardness, improve heat insulation effect simultaneously.
Detailed description of the invention
Below by embodiment, technical solution of the present invention is described in detail, but protection scope of the present invention is not limited to described embodiment.
Embodiment 1: the high-dimensional stability extruded sheet that a kind of polystyrene/polyethers is blended, including following component:
The carrier of described Masterbatch is perfluoroethylene-propylene.
The high-dimensional stability extruded sheet that above-mentioned polystyrene/polyethers is blended, comprises the steps:
(1) polystyrene through desolventing technology is reclaimed dark brown material, polystyrene reclaims DABAI material and adds in batch mixer, 195 DEG C it are heated under logical condition of nitrogen gas, and stop stirring after adding peroxidized t-butyl perbenzoate and benzoyl peroxide, mix homogeneously insulated and stirred 2.5h and be cooled to 60 DEG C；
(2) system in step (1) adds polystyrene virgin material, polytrimethylene ether, Masterbatch and polycthylene grafted MALEIC ACID, ZINC SALT, 225 DEG C it are again heated under logical condition of nitrogen gas, by mix homogeneously insulated and stirred 1.5h, add deca-BDE, Firebrake ZB, Styrene And Chloroalkyl Acrylates sodium and magnesium aluminum-hydrotalcite and continue stirring 1h；After being lowered the temperature by system temperature, pelletize processes；
(3) pellet step (2) obtained is sent in the feeding chamber of extruding machine, and injects foaming agent, carries out extrusion moulding；Described extruding machine is divided into a double screw extruder and No. two double screw extruders；A described double screw extruder is divided into 12 working regions, and by charging aperture, the temperature of each working region is set as 190 DEG C, 190 DEG C, 200 DEG C, 205 DEG C, 230 DEG C, 210 DEG C, 220 DEG C, 220 DEG C, 240 DEG C, 230 DEG C, 210 DEG C and 210 DEG C successively；Described No. two double screw extruders are divided into 9 each working regions, and by feed end, the first seven is set as 200 DEG C with the temperature of the 9th working region, and the temperature of the 8th working region is set as 210 DEG C；The screw speed of a described double screw extruder is 180rpm, and the screw speed of No. two double screw extruders is 10rpm；The material mouth pressure of No. two single screw extrusion machines is 15MPa；During described extrusion moulding, top board temperature controls is 90 DEG C, and it is 90 DEG C that lower platen temperature controls；Foaming agent injects in the 6th working region of a described double screw extruder；
(4) being transmitted through several jockey pulleys by the extruded sheet exported by extruding machine, and lower the temperature in transmitting procedure, cooling rate remains 2.5 DEG C/S, is dried and trimming processes.
Embodiment 2: the high-dimensional stability extruded sheet that a kind of polystyrene/polyethers is blended, including following component:
The carrier of described Masterbatch is perfluoroethylene-propylene.
The high-dimensional stability extruded sheet that above-mentioned polystyrene/polyethers is blended, comprises the steps:
(1) polystyrene through desolventing technology is reclaimed dark brown material, polystyrene reclaims DABAI material and adds in batch mixer, 150 DEG C it are heated under logical condition of nitrogen gas, and stop stirring after adding peroxidized t-butyl perbenzoate and benzoyl peroxide, mix homogeneously insulated and stirred 2h and be cooled to 50 DEG C；
(2) system in step (1) adds polystyrene virgin material, polytrimethylene ether, Masterbatch and polycthylene grafted MALEIC ACID, ZINC SALT, 200 DEG C it are again heated under logical condition of nitrogen gas, by mix homogeneously insulated and stirred 1h, add deca-BDE, Firebrake ZB, Styrene And Chloroalkyl Acrylates sodium and magnesium aluminum-hydrotalcite and continue stirring 0.5h；After being lowered the temperature by system temperature, pelletize processes；
(3) pellet step (2) obtained is sent in the feeding chamber of extruding machine, and injects foaming agent, carries out extrusion moulding；Described extruding machine is divided into a double screw extruder and No. two double screw extruders；A described double screw extruder is divided into 12 working regions, and by charging aperture, the temperature of each working region is set as 190 DEG C, 195 DEG C, 195 DEG C, 200 DEG C, 235 DEG C, 205 DEG C, 215 DEG C, 215 DEG C, 235 DEG C, 225 DEG C, 205 DEG C and 205 DEG C successively；Described No. two double screw extruders are divided into 9 each working regions, and by feed end, the first seven is set as 195 DEG C with the temperature of the 9th working region, and the temperature of the 8th working region is set as 205 DEG C；The screw speed of a described double screw extruder is 150rpm, and the screw speed of No. two double screw extruders is 8rpm；The material mouth pressure of No. two single screw extrusion machines is 8MPa；During described extrusion moulding, top board temperature controls is 60 DEG C, and it is 60 DEG C that lower platen temperature controls；Foaming agent injects in the 6th working region of a described double screw extruder；
(4) being transmitted through several jockey pulleys by the extruded sheet exported by extruding machine, and lower the temperature in transmitting procedure, cooling rate remains 2 DEG C/S, is dried and trimming processes.
Embodiment 3: the high-dimensional stability extruded sheet that a kind of polystyrene/polyethers is blended, including following component:
The carrier of described Masterbatch is perfluoroethylene-propylene.
The high-dimensional stability extruded sheet that above-mentioned polystyrene/polyethers is blended, comprises the steps:
(1) polystyrene through desolventing technology is reclaimed dark brown material, polystyrene reclaims DABAI material and adds in batch mixer, 200 DEG C it are heated under logical condition of nitrogen gas, and stop stirring after adding peroxidized t-butyl perbenzoate and benzoyl peroxide, mix homogeneously insulated and stirred 5h and be cooled to 80 DEG C；
(2) system in step (1) adds polystyrene virgin material, polytrimethylene ether, Masterbatch and polycthylene grafted MALEIC ACID, ZINC SALT, 250 DEG C it are again heated under logical condition of nitrogen gas, by mix homogeneously insulated and stirred 2.5h, add deca-BDE, Firebrake ZB, Styrene And Chloroalkyl Acrylates sodium and magnesium aluminum-hydrotalcite and continue stirring 1.5h；After being lowered the temperature by system temperature, pelletize processes；
(3) pellet step (2) obtained is sent in the feeding chamber of extruding machine, and injects foaming agent, carries out extrusion moulding；Described extruding machine is divided into a double screw extruder and No. two double screw extruders；A described double screw extruder is divided into 12 working regions, and by charging aperture, the temperature of each working region is set as 195 DEG C, 205 DEG C, 205 DEG C, 210 DEG C, 245 DEG C, 215 DEG C, 225 DEG C, 225 DEG C, 245 DEG C, 235 DEG C, 215 DEG C and 215 DEG C successively；Described No. two double screw extruders are divided into 9 each working regions, and by feed end, the first seven is set as 205 DEG C with the temperature of the 9th working region, and the temperature of the 8th working region is set as 215 DEG C.The screw speed of a described double screw extruder is 220rpm, and the screw speed of No. two double screw extruders is 20rpm；The material mouth pressure of No. two single screw extrusion machines is 20MPa；During described extrusion moulding, top board temperature controls is 100 DEG C, and it is 100 DEG C that lower platen temperature controls；Foaming agent injects in the 6th working region of a described double screw extruder；
(4) being transmitted through several jockey pulleys by the extruded sheet exported by extruding machine, and lower the temperature in transmitting procedure, cooling rate remains 5 DEG C/S, is dried and trimming processes.
Embodiment 1～3 product that this formula and method obtain is used to be shown in Table 1 with the data of existing product performance comparison
Table 1 embodiment 1～3 product and the data of existing product performance comparison
Although as it has been described above, represented and described the present invention with reference to specific preferred embodiment, but it shall not be construed as the restriction to the present invention self.Under the spirit and scope of the present invention premise defined without departing from claims, can various changes can be made in the form and details to it.
Claims (8)
1. the high-dimensional stability extruded sheet that polystyrene/polyethers is blended, it is characterised in that include following component:
The high-dimensional stability extruded sheet that polystyrene/polyethers the most according to claim 1 is blended, it is characterised in that
Including following component:
3. the high-dimensional stability extruded sheet being blended according to the polystyrene/polyethers described in any one of claim 1～2, its
It is characterised by: the carrier of described Masterbatch is perfluoroethylene-propylene.
4. the high-dimensional stability extruded sheet that the polystyrene/polyethers as described in any one of claim 1～2 is blended,
It is characterized in that comprising the steps:
(1) polystyrene through desolventing technology is reclaimed dark brown material, polystyrene reclaims DABAI material and adds in batch mixer,
Being heated to 150～200 DEG C under logical condition of nitrogen gas, and add benzoyl peroxide butyl ester and benzoyl peroxide, mixing is all
Stop stirring after even and insulated and stirred 2～5h and be cooled to 50～80 DEG C；
(2) system in step (1) adds polystyrene virgin material, polytrimethylene ether, Masterbatch and polycthylene grafted horse
Carry out sour zinc, under logical condition of nitrogen gas, be again heated to 200～250 DEG C, by mix homogeneously insulated and stirred 1～2.5h, add
Deca-BDE, Firebrake ZB, Styrene And Chloroalkyl Acrylates sodium and magnesium aluminum-hydrotalcite continue stirring 0.5～1.5h；By system temperature
After cooling, pelletize processes；
(3) pellet step (2) obtained is sent in the feeding chamber of extruding machine, and injects foaming agent, is extruded into
Type；
(4) extruded sheet exported by extruding machine is transmitted through several jockey pulleys, and lower the temperature in transmitting procedure, cooling
Speed remains 2～5 DEG C/S, is dried and trimming processes.
Preparation method the most according to claim 4, it is characterised in that: described extruding machine is divided into a twin screw to squeeze
Go out machine and No. two double screw extruders；A described double screw extruder is divided into 12 working regions, by charging aperture
The temperature of each working region be set as successively 190～195 DEG C, 195～205 DEG C, 195～205 DEG C, 200～210 DEG C,
235～245 DEG C, 205～215 DEG C, 215～225 DEG C, 215～225 DEG C, 235～245 DEG C, 225～235 DEG C, 205～215 DEG C
With 205～215 DEG C；Described No. two double screw extruders are divided into 9 each working regions, and by feed end, the first seven is with the 9th
The temperature of individual working region is set as 195～205 DEG C, and the temperature of the 8th working region is set as 205～215 DEG C.
Preparation method the most according to claim 5, it is characterised in that: the screw rod of a described double screw extruder
Rotating speed is 150～220rpm, and the screw speed of No. two single screw extrusion machines is 8～20rpm, No. two single screw extrusion machines
Material mouth pressure is 8～20MPa.
Preparation method the most according to claim 5, it is characterised in that: in step (3), foaming agent is in described No. one
6th working region of double screw extruder is injected.
Preparation method the most according to claim 4, it is characterised in that: extrusion moulding process described in step (3)
It is 60～100 DEG C that middle top board temperature controls, and it is 60～100 DEG C that lower platen temperature controls.
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