CN110343330A - A kind of crosslinked polypropylene foamed material and preparation method thereof - Google Patents
A kind of crosslinked polypropylene foamed material and preparation method thereof Download PDFInfo
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- 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
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- 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
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Abstract
The present invention provides a kind of crosslinked polypropylene foamed material and preparation method thereof, the foamed material includes following raw material, matrix resin, foaming agent, antioxidant, foaming stabilizer and sensitizer；Preparation method include extrusion molding, crosslinking with radiation, foaming agent dipping and etc., use free of contamination carbon dioxide as foaming agent in preparation process of the present invention；Compared with traditional crosslinked polypropylene foamed material, residual in product without azodicarbonamide and its decomposition product does not cause secondary pollution, meets environmentally protective requirement.
Description
Technical field
The invention belongs to foamed material technical fields, more particularly, to a kind of crosslinked polypropylene foamed material and its preparation side
Method.
Background technique
Foamed plastics is a kind of high molecular material formed in solid plastic by bulk gas micropore dispersion, has matter
Gently, the characteristics such as heat-insulated, sound-absorbing, damping, anti-corrosion, cheap, and dielectric properties be better than matrix resin, therefore it is daily packaging,
It is used widely in the fields such as agricultural, industry, aerospace, transportation, military project.
Crosslinked polypropylene foamed material (abbreviation IXPP) is a kind of polypropylene/gas recombination material, with its exclusive performance
Heat-barrier material is buffered as fastest-rising novel environment friendly resistance to compression in recent years.IXPP product has very excellent antidetonation energy absorption capacity
Energy, resilience, high temperature resistant, chemicals-resistant, oil resistivity and thermal insulation.
At present prepare crosslinked polypropylene foamed material main method be mixing mixing be granulated, squeeze out processing, crosslinking with radiation,
A kind of high temperature of foaming, which foams, is made polymeric foamed material, any surface finish, abscess be closed, it is fine and smooth and uniform, do not inhale
Water, environmental protection, there is good mechanical property simultaneously, superior heat-insulated and sound insulation value, the molding of easy secondary operation, can to assign its good
Good fire-retardant flex foam, is widely used in automobile interior decoration, Leisure Sport, tourism supplies, toy for children, health care
And the daily general merchandise industry such as packaging, freezing, building, decoration.However, the current electron radiation crosslinked polypropylene foamed material is matched
Side and preparation method can generate formamide and dimethyl methyl because using azo dimethylformamide (abbreviation AC) in decomposable process
Amide can remain in product when decomposing endless, and certain harm is generated to human body.
It is higher and higher for environmental protection, green, the pursuit of health as people's environmental consciousness is more and more stronger.Especially European Union
REACH138 item substance announcement, the range being related to is very extensive, in fact it will affect from mining industry to textile garment,
The product of nearly all industry such as light industry, electromechanics and manufacturing process.Wherein for the influence of foamed plastics industry, first is essentially consisted in
The announcement of amide and its derivative, especially for foam products application in toy, leisure, sport and articles for daily use are proposed more
High requirement.
Therefore it needs further research to improve the preparation formula and technique of IXPP, reduces and even eliminate formamide, diformazan
The residual of the harmful substances such as base formamide, azodicarbonamide.
Summary of the invention
In view of this, the present invention is directed to propose a kind of crosslinked polypropylene foamed material and preparation method thereof, existing to overcome
The deficiency of technology, during the preparation process, without using the chemical foaming agent such as azodicarbonamide, foaming agent used be carbon dioxide or
It is the physical blowing agents such as nitrogen, the residual without any harmful substance in product.
In order to achieve the above objectives, the technical scheme of the present invention is realized as follows:
A kind of crosslinked polypropylene foamed material, including following parts by weight raw material,
Matrix resin: homopolypropylene resin, atactic polypropylene copolymer, polyvinyl resin；Homopolypropylene 30~70
Parts by weight；Atactic polypropylene copolymer is that 20~80 parts by weight of binary atactic polypropylene copolymer or ternary random polypropylene are copolymerized
10~30 parts by weight of object；Polyethylene be 5~20 parts by weight of low density polyethylene (LDPE), 5~15 parts by weight of linear low density polyethylene (LLDPE) or
One of 5~20 parts by weight of high density polyethylene (HDPE)；
Gas nucleation agent: 0.1~0.5 parts by weight are added in the matrix resin of every 100 parts by weight；
Foaming agent: 0.5~20 parts by weight are added in the matrix resin of every 100 parts by weight；
Antioxidant: 0.5~2 parts by weight are added in the matrix resin of every 100 parts by weight.
Foaming stabilizer: 0.1~3 parts by weight are added in the matrix resin of every 100 parts by weight；
Sensitizer: 0.1~2 parts by weight are added in the matrix resin of every 100 parts by weight；
Preferably, 30~60 parts by weight of homopolypropylene, atactic polypropylene copolymer, polyethylene；Random polypropylene copolymerization
Object is 10~25 parts by weight of 20~60 parts by weight of binary atactic polypropylene copolymer or ternary atactic polypropylene copolymer；Polyethylene
For 5~15 parts by weight of low density polyethylene (LDPE), 5~10 weight of 10~15 parts by weight of linear low density polyethylene (LLDPE) or high density polyethylene (HDPE)
One of part；
Preferably, 35~55 parts by weight of homopolypropylene, atactic polypropylene copolymer, polyethylene；Random polypropylene copolymerization
Object is 15~25 parts by weight of 20~55 parts by weight of binary atactic polypropylene copolymer or ternary atactic polypropylene copolymer；Polyethylene
For 5~10 parts by weight of low density polyethylene (LDPE), 5~10 weight of 10~15 parts by weight of linear low density polyethylene (LLDPE) or high density polyethylene (HDPE)
One of part.
Preferably, the homopolypropylene resin melting index is 1~10g/10min, binary atactic copolymerized polypropene tree
Rouge melt index is 0.5~8g/10min；Ternary atactic copolymerized polypropene resin melting index is 1~12g/10min；Low-density
Polyvinyl resin melt index is 1~8g/10min；High-density polyethylene resin melt index is 1~12g/10min；It is preferred that
, the melt index of low density polyethylene (LDPE) is 0.5~6g/10min, and the melt index of linear low density polyethylene (LLDPE) is 1~5g/
10min, the melt index of high density polyethylene (HDPE) are 2~7g/10min.
Preferably, the Gas nucleation agent be from one or both of calcium carbonate, talcum powder, silica, mica with
On；The partial size of the Gas nucleation agent is 5~19 μm.
Preferably, the foaming agent is one or both of supercritical carbon dioxide, supercritical nitrogen, overcritical butane
More than.
Preferably, the antioxidant is four [β-(3,5- di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol esters, β-
(3,5- di-tert-butyl-hydroxy phenyl) propionic acid n-octadecyl alcohol ester, three [2.4- di-tert-butyl-phenyl] phosphite esters, it is bis- (2,
One or more of 4- di-tert-butyl-phenyl) propionic acid] pentaerythritol diphosphites；The foaming stabilizer is selected from single
One or more of sweet ester, stearic acid；The sensitizer is trimethylolpropane trimethacrylate.
A method of crosslinked polypropylene foamed material as described above is prepared, is included the following steps,
(1) foaming extrusion is added in homopolypropylene, atactic polypropylene copolymer, low density polyethylene (LDPE) and gas nucleating agent
Machine is stirred with the revolving speed of 20~40r/min at 200~230 DEG C of Yu Wendu, until material reaches molten condition, material mixing is equal
It is squeezed out after even through die head, with a thickness of 1~3mm, the master slice that width is 300~800mm；
(2) after the master slice in step (1) places 40~60h, master slice is irradiated with irradiation apparatus, is put again after irradiation
Set 40~60h；Preferably, it uses60Co electron accelerator is irradiated；
(3) master slice in step (2) is placed into autoclave, starts temperature program while being filled with foaming agent, heated up
Rate is 3~10 DEG C/min, and pressure, which reaches setting value, after temperature reaches setting value, in adjusting autoclave reaches carbon dioxide
Postcritical state reaches saturation time (after reaching set temperature pressure, time that material is placed in autoclave) and starts afterwards
Start cooling process, rate temperature change is 2~8 DEG C/min, when reaching 60~100 DEG C of temperature, starts pressure release program, Zhi Houqu
Master slice is stand-by out；
(4) sample is put into horizontal stove or vertical furnace foaming production line and is foamed, be collected simultaneously device and carry out product
It collects.
Preferably, in step (3), master slice is impregnated using supercritical carbon dioxide, pressure is 40~90MPa, temperature 80
~150 DEG C.
The present invention prepares electron irradiation crosslinked polypropylene foamed material as foaming agent using supercritical carbon dioxide, used
Foaming agent is environmentally friendly foaming agent.In preparation, matrix resin, Gas nucleation agent, antioxidant are added by a certain percentage double
In screw extruder, master slice collection is carried out using subsidiary engine by sheet die after material melts are sufficiently mixed, places 40~60h
Master slice is irradiated using irradiation apparatus afterwards, high-velocity electrons are generated using electron accelerator, high-velocity electrons penetrate poly- third sheet material,
Its internal various free radical of generation, to form new connecting key by be combineding with each other for free radical, become the polypropylene foil of crosslinking
Material.After master slice after irradiation is placed 40~60h, it is put into reaction kettle and is impregnated with supercritical carbon dioxide, will be impregnated later
Master slice foam through vertical furnace or horizontal stove, utilize subsidiary engine carry out product collection.
Compared with the existing technology, crosslinked polypropylene foamed material of the present invention and preparation method thereof has following excellent
Gesture:
(1) crosslinked polypropylene foamed material of the present invention, foamed product density are 0.60~10.0g/cm3, abscess
Diameter is 9 μm~2mm, 0.5~5mm of foamed product thickness；
(2) PP foam material of the present invention belongs to crosslinked, and free of contamination dioxy is used in preparation process
Change carbon as foaming agent；Compared with traditional crosslinked polypropylene foamed material, produced in product without azodicarbonamide and its decomposition
The residual of object, does not cause secondary pollution, meets environmentally protective requirement；The PP foam material of the method preparation can answer extensively
For fields such as insulating tableware, automotive upholstery, packagings.
Detailed description of the invention
Fig. 1 is a kind of abscess-size detection figure of polypropylene foamed sheet described in the embodiment of the present invention 1；
Fig. 2 is a kind of abscess-size detection figure of polypropylene foamed sheet described in the embodiment of the present invention 2；
Fig. 3 is a kind of abscess-size detection figure of polypropylene foamed sheet described in the embodiment of the present invention 3；
Fig. 4 is a kind of abscess-size detection figure of polypropylene foamed sheet described in the embodiment of the present invention 4.
Specific embodiment
In addition to being defined, technical term used in following embodiment has universal with those skilled in the art of the invention
The identical meanings of understanding.Test reagent used in following embodiment is unless otherwise specified conventional biochemical reagent；It is described
Experimental method is unless otherwise specified conventional method.
Below with reference to embodiment, the present invention will be described in detail.
Embodiment 1
A kind of PP foam material, each component including following parts by weight:
Matrix resin: 45 parts by weight of polypropylene homopolymer, 45 parts by weight of polypropylene binary random copolymer, low density polyethylene
10 parts by weight of alkene；
Gas nucleation agent is talcum powder: 0.5 parts by weight of talcum powder are added in the matrix resin of every 100 parts by weight；
Antioxidant is four [β-(3,5- di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol esters: the base of every 100 parts by weight
1.5 parts by weight are added in body resin；
Physical blowing agent is supercritical carbon dioxide；The adding amount of carbon dioxide is determined by impregnation pressure below.
Foaming stabilizer is monoglyceride, and 0.5 parts by weight of talcum powder are added in the matrix resin of every 100 parts by weight；
Sensitizer trimethylolpropane trimethacrylate adds 0.5 parts by weight in the matrix resin of every 100 parts by weight；
In the present embodiment PP foam material the preparation method comprises the following steps:
(1) by certain polypropylene homopolymer with ratio, polypropylene random copolymer, low density polyethylene (LDPE), nucleating agent, anti-
Oxygen agent, sensitizer are put into double screw extruder after mixing, with the revolving speed of 20~40r/min at 200~230 DEG C of Yu Wendu
Stirring, until material reaches molten condition；
(2) after the material in step (1) melts completely, master slice collection is carried out by sheet die and subsidiary engine；
(3) master slice in step (2) is placed into 48h, is then irradiated with electron beam；
(4) master slice after irradiation in step (3) is placed into 48h, is impregnated in a kettle with supercritical carbon dioxide, impregnated
Pressure is 50 ± 5MPa, and temperature is 100 ± 10 DEG C, and soaking time is 5 hours, then by master slice by vertical furnace or horizontal stove into
Row foaming carries out material collection using subsidiary engine.
The porosity of 1 product of example is 80%.
Such as Fig. 1, for the abscess-size of 1 product detect figure, as can be seen from Figure, average pore size is 200 μm, and abscess is thin
It is close uniform.
Embodiment 2
A kind of PP foam material, each component including following parts by weight:
Matrix resin: 30 parts by weight of polypropylene homopolymer, 65 parts by weight of binary atactic polypropylene copolymer, linear, low density
5 parts by weight of polyethylene；
The mixture that Gas nucleation agent is silica and talcum powder weight ratio is 1:4: the matrix resin of every 100 parts by weight
0.8 parts by weight of middle addition；
Physical blowing agent is supercritical carbon dioxide；
Antioxidant is β-(3,5- di-tert-butyl-hydroxy phenyl) propionic acid n-octadecyl alcohol ester: the matrix of every 100 parts by weight
1.5 parts by weight are added in resin；
Foaming stabilizer is monoglyceride, and 0.5 parts by weight of talcum powder are added in the matrix resin of every 100 parts by weight；
Sensitizer is trimethylolpropane trimethacrylate, adds 0.5 parts by weight in the matrix resin of every 100 parts by weight；
In the present embodiment PP foam material the preparation method comprises the following steps:
(1) certain polypropylene homopolymer, polypropylene random copolymer, nucleating agent, antioxidant with ratio is uniformly mixed
It puts into double screw extruder, is stirred at 200~230 DEG C of Yu Wendu with the revolving speed of 20~40r/min afterwards, until material reaches molten
Melt state；
(2) after the material in step (1) melts completely, master slice collection is carried out by sheet die and subsidiary engine；
(3) master slice in step (2) is placed into 48h, is then irradiated with electron beam；
(4) master slice after irradiation in step (3) is placed into 48h, is impregnated in a kettle with supercritical carbon dioxide, impregnated
Pressure is 70 ± 5MPa, and temperature is 100 ± 10 DEG C, and soaking time is 5 hours, then by master slice by vertical furnace or horizontal stove into
Row foaming carries out material collection using subsidiary engine.
The porosity of 2 product of example is 83%.
Such as Fig. 2, for the abscess-sizes of 2 products detect figure, as can be seen from Figure, average pore size is 260 μm, and abscess is thin
It is close uniform.
Embodiment 3
A kind of PP foam material, each component including following parts by weight:
Matrix resin: 40 parts by weight of polypropylene homopolymer, 52 parts by weight of binary polypropylene random copolymer, high-density polyethylene
8 parts by weight of alkene；
Gas nucleation agent is talcum powder: 0.5 parts by weight of talcum powder are added in the matrix resin of every 100 parts by weight；
Antioxidant is four [β-(3,5- di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol esters: the base of every 100 parts by weight
1.5 parts by weight are added in body resin；
Physical blowing agent is supercritical nitrogen.
Foaming stabilizer is monoglyceride, and 0.5 parts by weight of talcum powder are added in the matrix resin of every 100 parts by weight；
Sensitizer trimethylolpropane trimethacrylate adds 0.5 parts by weight in the matrix resin of every 100 parts by weight；
In the present embodiment PP foam material the preparation method comprises the following steps:
(1) certain polypropylene homopolymer, polypropylene random copolymer, polyethylene, nucleating agent, antioxidant with ratio is mixed
It after closing uniformly in investment double screw extruder, is stirred at 200~230 DEG C of Yu Wendu with the revolving speed of 20~40r/min, until material
Reach molten condition；
(2) after the material in step (1) melts completely, master slice collection is carried out by sheet die and subsidiary engine；
(3) master slice in step (2) is placed into 48h, is then irradiated with electron beam；
(4) master slice after irradiation in step (3) is placed into 48h, is impregnated in a kettle with supercritical nitrogen, impregnated
Pressure is 80 ± 5MPa, and temperature is 100 ± 10 DEG C, and soaking time is 5 hours, then by master slice by vertical furnace or horizontal stove into
Row foaming carries out material collection using subsidiary engine.
The porosity of 3 product of example is 75%.
Such as Fig. 3, for the abscess-sizes of 3 products detect figure, as can be seen from Figure, average pore size is 100 μm, and abscess is thin
It is close uniform.
Embodiment 4
A kind of PP foam material, each component including following parts by weight:
Matrix resin: 40 parts by weight of polypropylene homopolymer, 55 parts by weight of binary polypropylene random copolymer, low density polyethylene
5 parts by weight of alkene；
Gas nucleation agent is talcum powder: 0.5 parts by weight of talcum powder are added in the matrix resin of every 100 parts by weight；
Antioxidant is four [β-(3,5- di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol esters: the base of every 100 parts by weight
1.5 parts by weight are added in body resin；
Physical blowing agent is the mixture of nitrogen and carbon dioxide volume ratio 1:6.
Foaming stabilizer is monoglyceride, and 0.5 parts by weight of talcum powder are added in the matrix resin of every 100 parts by weight
Sensitizer trimethylolpropane trimethacrylate adds 0.5 parts by weight in the matrix resin of every 100 parts by weight；
In the present embodiment PP foam material the preparation method comprises the following steps:
(1) by certain polypropylene homopolymer with ratio, polypropylene random copolymer, low density polyethylene (LDPE), nucleating agent, anti-
Oxygen agent is put into double screw extruder after mixing, is stirred at 200~230 DEG C of Yu Wendu with the revolving speed of 20~40r/min, directly
Reach molten condition to material；
(2) after the material in step (1) melts completely, master slice collection is carried out by sheet die and subsidiary engine；
(3) master slice in step (2) is placed into 48h, is then irradiated with electron beam；
(4) master slice after irradiation in step (3) is placed into 48h, is impregnated in a kettle with supercritical carbon dioxide, impregnated
Pressure is 60 ± 5MPa, and temperature is 90 ± 5 DEG C, and soaking time is 6 hours, then carries out master slice by vertical furnace or horizontal stove
Foaming carries out material collection using subsidiary engine.
The porosity of 4 product of example is 80%.
Such as Fig. 4, for the abscess-sizes of 4 products detect figure, as can be seen from Figure, average pore size is 80 μm, and abscess is thin
It is close uniform.
The crosslinked polypropylene of comparative example Ying Fu new high-tech material Co., Ltd buying.
PP foam material in for embodiment 1 and comparison is subjected to correlated performance verifying.
Performance detection:
Performance detection is carried out to the chemical blowing material in embodiment 1 and comparative example, performance test results see the table below.
The 1 performance table of comparisons of table
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of crosslinked polypropylene foamed material, which is characterized in that including following parts by weight raw material,
Matrix resin: homopolypropylene resin, atactic polypropylene copolymer, polyvinyl resin；30~70 weight of homopolypropylene
Part；Atactic polypropylene copolymer is 20~80 parts by weight of binary atactic polypropylene copolymer or ternary atactic polypropylene copolymer 10
~30 parts by weight；Polyethylene is 5~20 parts by weight of low density polyethylene (LDPE), linear low density polyethylene (LLDPE) 5~15 parts by weight or highly dense
Spend one of 5~20 parts by weight of polyethylene；
Gas nucleation agent: 0.1~0.5 parts by weight are added in the matrix resin of every 100 parts by weight；
Foaming agent: 0.5~20 parts by weight are added in the matrix resin of every 100 parts by weight；
Antioxidant: 0.5~2 parts by weight are added in the matrix resin of every 100 parts by weight.
Foaming stabilizer: 0.1~3 parts by weight are added in the matrix resin of every 100 parts by weight；
Sensitizer: 0.1~2 parts by weight are added in the matrix resin of every 100 parts by weight.
2. crosslinked polypropylene foamed material according to claim 1, it is characterised in that: 30~60 weight of homopolypropylene
Part, atactic polypropylene copolymer, polyethylene；Atactic polypropylene copolymer is 20~60 parts by weight of binary atactic polypropylene copolymer
Or 10~25 parts by weight of ternary atactic polypropylene copolymer；Polyethylene is 5~15 parts by weight of low density polyethylene (LDPE), linear, low density
One of 5~10 parts by weight of 10~15 parts by weight of polyethylene or high density polyethylene (HDPE).
3. crosslinked polypropylene foamed material according to claim 1, it is characterised in that: 35~55 weight of homopolypropylene
Part, atactic polypropylene copolymer, polyethylene；Atactic polypropylene copolymer is 20~55 parts by weight of binary atactic polypropylene copolymer
Or 15~25 parts by weight of ternary atactic polypropylene copolymer；Polyethylene is 5~10 parts by weight of low density polyethylene (LDPE), linear, low density
One of 5~10 parts by weight of 10~15 parts by weight of polyethylene or high density polyethylene (HDPE).
4. described in any item crosslinked polypropylene foamed materials according to claim 1~3, it is characterised in that: the homopolymerization poly- third
Olefine resin melt index is 1~10g/10min, and binary atactic copolymerized polypropene resin melting index is 0.5~8g/10min；Three
First atactic copolymerized polypropene resin melting index is 1~12g/10min；Ldpe resin melt index is 1~8g/
10min；High-density polyethylene resin melt index is 1~12g/10min；Preferably, the melt index of low density polyethylene (LDPE) is
0.5~6g/10min, the melt index of linear low density polyethylene (LLDPE) are 1~5g/10min, the melt index of high density polyethylene (HDPE)
For 2~7g/10min.
5. described in any item crosslinked polypropylene foamed materials according to claim 1~3, it is characterised in that: the Gas nucleation
Agent is from one or more of calcium carbonate, talcum powder, silica, mica；The partial size of the Gas nucleation agent be 5~
19μm。
6. described in any item crosslinked polypropylene foamed materials according to claim 1~3, it is characterised in that: the foaming agent is
One or more of supercritical carbon dioxide, supercritical nitrogen, overcritical butane.
7. described in any item crosslinked polypropylene foamed materials according to claim 1~3, it is characterised in that: the antioxidant is
Four [β-(3,5- di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol esters, β-(3,5- di-tert-butyl-hydroxy phenyl) propionic acid
Positive octadecanol ester, three [2.4- di-tert-butyl-phenyl] phosphite esters, bis- (2,4- di-tert-butyl-phenyl) propionic acid] pentaerythrite two
One or more of phosphite ester；The foaming stabilizer is selected from one or more of monoglyceride, stearic acid；
The sensitizer is trimethylolpropane trimethacrylate.
8. a kind of method for preparing crosslinked polypropylene foamed material as described in any one of claims 1 to 7, it is characterised in that:
Include the following steps,
(1) foam extrusion machine is added in homopolypropylene, atactic polypropylene copolymer, low density polyethylene (LDPE) and gas nucleating agent,
It is stirred at 200~230 DEG C of temperature with the revolving speed of 20~40r/min, until material reaches molten condition, material is after mixing
It is squeezed out through die head, with a thickness of 1~3mm, the master slice that width is 300~800mm；
(2) after the master slice in step (1) places 40~60h, master slice is irradiated with irradiation apparatus, places 40 after irradiation again
~60h；Preferably, it uses60Co electron accelerator is irradiated；
(3) master slice in step (2) is placed into autoclave, starts temperature program, heating rate while being filled with foaming agent
For 3~10 DEG C/min, after temperature reaches setting value, adjusts pressure in autoclave and reach setting value carbon dioxide is made to reach super and face
The state on boundary, saturation time are 4~8h, reach and start to start cooling process after saturation time, rate temperature change is 2~8 DEG C/
Min, when reaching 60~100 DEG C of temperature, starts pressure release program, and it is stand-by to take out master slice later；
(4) sample is put into horizontal stove or vertical furnace foaming production line and is foamed, be collected simultaneously device and carry out product collection.
9. preparation method according to claim 8, it is characterised in that: in step (3), impregnated using supercritical carbon dioxide
Master slice, pressure are 40~90MPa, and temperature is 80~150 DEG C.
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| CN115477812A (en) * | 2022-10-11 | 2022-12-16 | 安徽泓诺新材料有限公司 | High-elasticity crosslinked polypropylene foam material and preparation method thereof |
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