CN104476711B - A kind of production method of homogeneous polypropylene expanded slab - Google Patents
A kind of production method of homogeneous polypropylene expanded slab Download PDFInfo
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- CN104476711B CN104476711B CN201410796692.5A CN201410796692A CN104476711B CN 104476711 B CN104476711 B CN 104476711B CN 201410796692 A CN201410796692 A CN 201410796692A CN 104476711 B CN104476711 B CN 104476711B
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- polypropylene
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- 239000004743 Polypropylene Substances 0.000 title claims abstract description 111
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 111
- -1 polypropylene Polymers 0.000 title claims abstract description 107
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 33
- 238000005187 foaming Methods 0.000 claims abstract description 117
- 239000000463 material Substances 0.000 claims abstract description 63
- 238000007664 blowing Methods 0.000 claims abstract description 39
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 25
- 238000009792 diffusion process Methods 0.000 claims abstract description 16
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 11
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 11
- 239000007789 gas Substances 0.000 claims description 51
- 238000000034 method Methods 0.000 claims description 25
- 238000001125 extrusion Methods 0.000 claims description 20
- 238000001816 cooling Methods 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 17
- 238000004090 dissolution Methods 0.000 claims description 12
- 238000007493 shaping process Methods 0.000 claims description 12
- 239000007921 spray Substances 0.000 claims description 12
- 230000006837 decompression Effects 0.000 claims description 11
- 230000008676 import Effects 0.000 claims description 11
- 230000006698 induction Effects 0.000 claims description 11
- 238000013022 venting Methods 0.000 claims description 11
- 239000003063 flame retardant Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000000654 additive Substances 0.000 claims description 8
- 230000000996 additive effect Effects 0.000 claims description 8
- 239000012752 auxiliary agent Substances 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 239000011159 matrix material Substances 0.000 claims description 6
- 239000004595 color masterbatch Substances 0.000 claims description 5
- 239000011256 inorganic filler Substances 0.000 claims description 5
- 229910003475 inorganic filler Inorganic materials 0.000 claims description 5
- 238000004513 sizing Methods 0.000 claims description 5
- 239000008393 encapsulating agent Substances 0.000 claims description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 239000004411 aluminium Substances 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- DMFGNRRURHSENX-UHFFFAOYSA-N beryllium copper Chemical compound [Be].[Cu] DMFGNRRURHSENX-UHFFFAOYSA-N 0.000 claims description 2
- 239000010439 graphite Substances 0.000 claims description 2
- 229910002804 graphite Inorganic materials 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 238000010792 warming Methods 0.000 claims description 2
- 239000006260 foam Substances 0.000 abstract description 8
- 238000005516 engineering process Methods 0.000 abstract description 3
- GCNLQHANGFOQKY-UHFFFAOYSA-N [C+4].[O-2].[O-2].[Ti+4] Chemical compound [C+4].[O-2].[O-2].[Ti+4] GCNLQHANGFOQKY-UHFFFAOYSA-N 0.000 abstract description 2
- 230000004888 barrier function Effects 0.000 abstract description 2
- 230000006378 damage Effects 0.000 abstract description 2
- 229960004424 carbon dioxide Drugs 0.000 description 12
- 238000011084 recovery Methods 0.000 description 10
- 229910052799 carbon Inorganic materials 0.000 description 9
- 239000006261 foam material Substances 0.000 description 9
- 229920000642 polymer Polymers 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 4
- 229910002090 carbon oxide Inorganic materials 0.000 description 3
- 206010000269 abscess Diseases 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000004811 fluoropolymer Substances 0.000 description 1
- 229920002313 fluoropolymer Polymers 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
-
- 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
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
-
- 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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/34—Auxiliary operations
-
- 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
- B29C48/30—Extrusion nozzles or dies
- B29C48/305—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets
-
- 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
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/90—Thermal treatment of the stream of extruded material, e.g. cooling with calibration or sizing, i.e. combined with fixing or setting of the final dimensions of the extruded article
-
- 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
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/919—Thermal treatment of the stream of extruded material, e.g. cooling using a bath, e.g. extruding into an open bath to coagulate or cool the material
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
The invention discloses a kind of production method of homogeneous polypropylene microporous foaming structure slab, its most important feature is that blow pressure, temperature and time need to meet：
Description
Technical field
The present invention relates to high molecular foam material preparing technical field, a kind of homogeneous polypropylene microporous foaming of specific design
The production method of structure slab.
Background technology
Polymer micro expanded material is to refer in particular to abscess to be less than 100 μm of size, and hole density is more than 1.0 × 106Individual/cm3It is poly-
The porous, expanded material of compound.The high-strength light that has due to it, save the features such as material, microcellular foam material, which has, widely should
Use prospect.In numerous polymer micro expanded materials, polypropylene (PP) microcellular foam material has good mechanical performance,
Higher heat distortion temperature, chemical-resistant, surface protection performance, and it is easily recycled recycling.By using overcritical two
Carbonoxide or supercritical nitrogen foam obtained polypropylene microporous expanded material, cleanliness without any pollution.Especially, products thickness is larger
Polypropylene microporous foaming plate, as thickness be more than 10mm be sandwich core filled composite material preferable core, can be applied to protect
The thermal insulation board of warm car, refrigerator car, automobile, the ceiling of car and rail traffic vehicles, floor etc., and applied to ship, building etc.
Heat-insulation and heat-preservation.
Common continuous extrusion foaming method is difficult that polypropylene expanded slab is made.By material resin, gas in the melt
The limitation of the factors such as the heat removal of rate of pressure reduction, foaming body core that dispersion level, die head go out, continuous extrusion foaming are only suitable for
Relatively small in production thickness, general thickness is less than 5mm microporous foam sheet material.
Solid-state foaming is the common method for preparing polymer micro expanded material.Solid-state foaming process refers to blowing temperature
Less than the flowing temperature of polymer, polymer is still within conditions of solid-state, is that gases at high pressure dissolving diffuses into polymer
Matrix, cell nucleation and the foaming process of growth are then induced by quick pressure releasing.In solid-state foaming process, gases at high pressure lead to
Cross molecule diffusion and penetrate into polymeric matrix, the saturation time for reaching diffusion balance depends on blowing temperature, gas pressure
Power, fluoropolymer resin species and its thickness.For common solid-state foaming process, diffusion speed of the gas in most polymers
Degree is slower, and the saturation time reached needed for dissolution equilibrium is longer.In particular with the increase of products thickness, saturation time will significantly
Extend.Therefore, current solid-state foaming is commonly applied to prepare the less sheet material of thickness, and prepares the larger microporous foam of thickness
Abscess is uneven during sheet material, and foaming is time-consuming longer, less efficient.
Chinese patent PCT/CN2012/084503 discloses a kind of production method of polypropylene microporous foaming thick plate, the party
Method uses the polypropylene board with core to be foamed for motherboard using flat board foaming machine.Due to the cored structure of motherboard,
The cavity that core is left made from this method inside foaming plate be present, overall structure heterogeneity, cored structure is empty after expanding
Hole becomes big, configurations, influences the overall mechanical performance of sheet material, heat-insulating property.Meanwhile in the following process of sheet material, core
The cavity left cannot function as sheet material use, and produce substantial amounts of waste material.
The content of the invention
For above-mentioned the shortcomings of the prior art, the present invention provides a kind of homogeneous polypropylene microporous foaming structure slab
Production method, specific process comprises the following steps：
(1) flat board foaming mould is warming up to blowing temperature by the temperature control system for providing heat；
(2) the homogeneous polypropylene motherboard of structure is put into flat board foaming mould, hydraulic system driving flat board foaming mould
Matched moulds, hydraulic system are forced into 10-35MPa, and gases at high pressure induction system imports high temperature and high pressure gas into flat board foaming mould,
The pressure of high temperature and high pressure gas is 5-30MPa, preferably 5-25MPa, and blowing temperature and time need to meet：T=0.227* (T-150
)2+0.004083*(P-17.5)4+ 40, wherein t are foamed time/min；T be blowing temperature/DEG C；P is blow pressure/MPa, i.e.,
The pressure of high temperature and high pressure gas, wherein, t values are 30-250min, preferably 40-230min；The gas of HTHP is from polypropylene
The diffusion into the surface of motherboard enters polymeric matrix；
(3) after reaching dissolution equilibrium, gas in the quick venting flat board foaming mould of rapid decompression system simultaneously passes through gas
Recovery system is reclaimed, and mould die sinking, polypropylene motherboard is ejected and foamed out of mould, obtains polypropylene microporous foaming material
Material.
The thickness of the polypropylene mother matrix is 2-30mm.
Described blowing temperature is less than polyacrylic fusing point, it is preferred that 130-160 DEG C of blowing temperature；
Described high temperature and high pressure gas are carbon dioxide or the mixture of nitrogen or the two arbitrary proportion；
Described flat board foaming mould has encapsulant, and the encapsulant is beryllium copper, aluminium, graphite or polytetrafluoroethylene (PTFE)
The compound of any one or more.
The polypropylene motherboard, is prepared by extrusion molding production line, and complete extruding production line includes batch mixer, screw rod
Extruder, flat-plate special extrusion die, cooling and shaping platform, spray water tank, hauling machine and cutting machine；Specifically preparation process is：
(1) pp material is sucked into screw extruder hopper, in 70-80 DEG C of drying；
(2) dried raw material is by the plasticizing of screw extruder, mixing, the parameter setting of screw extruder：Screw rod
160-250 DEG C of temperature, 160-180 DEG C of die head temperature, melt pressure 5-15MPa, engine speed 10-50rpm；
(3) melt polypropylene plastified is molded by flat-plate special extrusion die；
(4) the polypropylene extrusion board of molten state under the pulling force of hauling machine by cooling and shaping platform, obtain preliminary cooling and
Sizing, the pulling speed of hauling machine are：10-50cm/min, the temperature of cooling and shaping platform is 5-20 DEG C；
(5) tentatively sizing polypropylene extrusion board enters spray water tank after going out cooling and shaping platform, further cooling, sprays water temperature
10-30℃；
(6) the polypropylene extrusion board through spray is cut by cutting machine by certain length, obtains polypropylene motherboard
Described pp material is general grade polypropylene, specifically HOPP or atactic copolymerized polypropene.Melting
Index is 0.1-5.0g/10min, preferably 1.0-3.0g/10min.
Pp material described in step (1), auxiliary agent is added, after being pre-mixed by batch mixer, then sucks screw extruder
Hopper, in 70-80 DEG C of drying；Described auxiliary agent include color masterbatch, inorganic filler, fire retardant, antistatic additive, using polypropylene as
100 parts by weight meters, color masterbatch 0-2 parts by weight, inorganic filler 0-10 parts by weight, fire retardant 0-30 parts by weight, antistatic additive 0-15
Parts by weight；Whether the auxiliary agent adds and species determines according to specific product requirement, wherein fire retardant and antistatic additive difference
Fire resistance and antistatic property are realized, the application field higher to fire protection requirement, typically requires that PP foam material has
Fire resistance, now add fire retardant；And pack application field in electronic product, then typically require that PP foam material has
Antistatic property, now add antistatic additive.
Compared with prior art, the advantage of the invention is that：Using the temperature and pressure condition of foaming of the present invention,
By fixed conspiracy relation, it is easy to titanium dioxide Carbon diffusion, while also avoid carbon dioxide gas stream to polyacrylic destruction,
The technology barrier of direct foaming thick plate can not be realized always by overcoming prior art, and it is big to realize to obtain expansion ratio, aperture chi
Very little small, cell density is high, and thickness is larger, the purpose of the homogeneous polypropylene microporous expanded material of structure, and it is big that foam thickness can be achieved
In 10mm expanded material.The foaming plate overall mechanical properties are good, heat-insulating property is superior；A foaming machine can assemble simultaneously
Multi-layer planar mould, production efficiency are higher.
Brief description of the drawings
Fig. 1 is the structural representation of the foaming thick plate without core bore prepared by the present invention；
Fig. 2 is the structural representation for the foaming thick plate for having core bore in comparative example.
Embodiment
Characterizing method is as follows：
The apparent density of microcellular foam material is obtained according to ISO845 standard testings, final microporous foam can be calculated
The expansion ratio of material.Expansion ratio Rex=ρpolymer/ρfoam, wherein ρpolymerFor the density of unexpanded polymer, ρfoamTo be micro-
The apparent density of hole expanded material.
The tensile strength of microcellular foam material, compressive strength are measured according to ISO1798, ISO844 and ISO8067 respectively.
Embodiment 1
A kind of production method of the homogeneous slab of polypropylene microporous foaming structure, using flat board foaming machine to polypropylene motherboard
Foamed, motherboard is the homogeneous sheet material of structure, and specific foaming process comprises the following steps：
(1) flat board foaming mould temperature is increased to blowing temperature, 148 DEG C of blowing temperature；
(2) the homogeneous polypropylene motherboard (11mm) of structure is put into flat board foaming mould, hydraulic system driving flat board hair
Mould matched moulds is steeped, hydraulic system is forced into 30MPa, and gases at high pressure induction system imports the two of 18MPa into flat board foaming mould
Carbon oxide gas, blowing temperature T are 148 DEG C, and foamed time t (minute) meets lower formula：
T=0.227* (T-150)2+0.004083*(P-17.5)4+ 40, (wherein t is 41min；T is 148 DEG C, and P is
18MPa)；
(3) after reaching diffusion dissolution balance, gas in the rapid venting flat board foaming mould of rapid decompression system simultaneously passes through
Gas recovery system is reclaimed, and mould die sinking, polypropylene motherboard is ejected and foamed out of mould, obtains polypropylene microporous expanded material
25.2mm。
Embodiment 2
A kind of production method of the homogeneous slab of polypropylene microporous foaming structure, using flat board foaming machine to polypropylene motherboard
Foamed, motherboard is the homogeneous sheet material of structure, and specific foaming process comprises the following steps；
(1) flat board foaming mould temperature is increased to blowing temperature, 160 DEG C of blowing temperature；
(2) the homogeneous polypropylene motherboard (17mm) of structure is put into flat board foaming mould, hydraulic system driving flat board hair
Mould matched moulds is steeped, hydraulic system is forced into 30MPa, and gases at high pressure induction system imports 25MPa height into flat board foaming mould
Warm carbon dioxide, blowing temperature T are 160 DEG C, and foamed time t (minute) meets lower formula：
T=0.227* (T-150)2+0.004083*(P-17.5)4+ 40, (wherein t is 76min；T is 160 DEG C, and P is
25MPa)；
(3) after reaching diffusion dissolution balance, gas in the rapid venting flat board foaming mould of rapid decompression system simultaneously passes through
Gas recovery system is reclaimed, and mould die sinking, polypropylene motherboard is ejected and foamed out of mould, obtains polypropylene microporous expanded material
49.7mm。
Embodiment 3
A kind of production method of the homogeneous slab of polypropylene microporous foaming structure, using flat board foaming machine to polypropylene motherboard
Foamed, motherboard is the homogeneous sheet material of structure, and specific foaming process comprises the following steps：
(1) flat board foaming mould temperature is increased to blowing temperature, 130 DEG C of blowing temperature；
(2) the homogeneous polypropylene motherboard (3m m) of structure is put into flat board foaming mould, hydraulic system driving flat board hair
Mould matched moulds is steeped, hydraulic system is forced into 10MPa, and gases at high pressure induction system imports 5MPa high temperature into flat board foaming mould
Carbon dioxide, blowing temperature T are 130 DEG C, and foamed time t (minute) meets lower formula：
T=0.227* (T-150)2+0.004083*(P-17.5)4+ 40, (wherein t is 231min；T is 130 DEG C, and P is
5MPa)；
(3) after reaching diffusion dissolution balance, gas in the rapid venting flat board foaming mould of rapid decompression system simultaneously passes through
Gas recovery system is reclaimed, and mould die sinking, polypropylene motherboard is ejected and foamed out of mould, obtains polypropylene microporous expanded material
7.7mm。
Embodiment 4
A kind of production method of the homogeneous slab of polypropylene microporous foaming structure, using flat board foaming machine to polypropylene motherboard
Foamed, motherboard is the homogeneous sheet material of structure, and specific foaming process comprises the following steps：
(1) flat board foaming mould temperature is increased to blowing temperature, 130 DEG C of blowing temperature；
(2) the homogeneous polypropylene motherboard (18mm) of structure is put into flat board foaming mould, hydraulic system driving flat board hair
Mould matched moulds is steeped, hydraulic system is forced into 30MPa, and gases at high pressure induction system imports 25MPa height into flat board foaming mould
Warm carbon dioxide, blowing temperature T are 130 DEG C, and foamed time t (minute) meets lower formula：
T=0.227* (T-150)2+0.004083*(P-17.5)4+ 40, (wherein t is 144min；T is 130 DEG C, and P is
25MPa)；
(3) after reaching diffusion dissolution balance, gas in the rapid venting flat board foaming mould of rapid decompression system simultaneously passes through
Gas recovery system is reclaimed, and mould die sinking, polypropylene motherboard is ejected and foamed out of mould, obtains polypropylene microporous expanded material
30.8mm。
Embodiment 5
A kind of production method of the homogeneous slab of polypropylene microporous foaming structure, using flat board foaming machine to polypropylene motherboard
Foamed, motherboard is the homogeneous sheet material of structure, and specific foaming process comprises the following steps：
(1) flat board foaming mould temperature is increased to blowing temperature, 130 DEG C of blowing temperature；
(2) the homogeneous polypropylene motherboard (9mm) of structure is put into flat board foaming mould, hydraulic system driving flat board foaming
Mould matched moulds, hydraulic system are forced into 30MPa, and gases at high pressure induction system imports 18MPa high temperature into flat board foaming mould
Carbon dioxide, blowing temperature T are 130 DEG C, and foamed time t (minute) meets lower formula：
T=0.227* (T-150)2+0.004083*(P-17.5)4+ 40, (wherein t is 131min；T is 130 DEG C, and P is
18MPa)；
(3) after reaching diffusion dissolution balance, gas in the rapid venting flat board foaming mould of rapid decompression system simultaneously passes through
Gas recovery system is reclaimed, and mould die sinking, polypropylene motherboard is ejected and foamed out of mould, obtains polypropylene microporous expanded material
18mm。
Embodiment 6
A kind of production method of the homogeneous slab of polypropylene microporous foaming structure, using flat board foaming machine to polypropylene motherboard
Foamed, motherboard is the homogeneous sheet material of structure, and specific foaming process comprises the following steps：
(1) flat board foaming mould temperature is increased to blowing temperature, 160 DEG C of blowing temperature；
(2) the homogeneous polypropylene motherboard (5mm) of structure is put into flat board foaming mould, hydraulic system driving flat board foaming
Mould matched moulds, hydraulic system are forced into 35MPa, and gases at high pressure induction system imports 30MPa high temperature into flat board foaming mould
Carbon dioxide, blowing temperature T are 160 DEG C, and foamed time t (minute) meets lower formula：
T=0.227* (T-150)2+0.004083*(P-17.5)4+ 40, (wherein t is 163min；T is 160 DEG C, and P is
30MPa)；
(3) after reaching diffusion dissolution balance, gas in the rapid venting flat board foaming mould of rapid decompression system simultaneously passes through
Gas recovery system is reclaimed, and mould die sinking, polypropylene motherboard is ejected and foamed out of mould, obtains polypropylene microporous expanded material
15.5mm。
Embodiment 7
A kind of production method of the homogeneous slab of polypropylene microporous foaming structure, using flat board foaming machine to polypropylene motherboard
Foamed, motherboard is the homogeneous sheet material of structure, and specific foaming process comprises the following steps：
(1) flat board foaming mould temperature is increased to blowing temperature, 160 DEG C of blowing temperature；
(2) the homogeneous polypropylene motherboard (10mm) of structure is put into flat board foaming mould, hydraulic system driving flat board hair
Mould matched moulds is steeped, hydraulic system is forced into 30MPa, and gases at high pressure induction system imports 18MPa height into flat board foaming mould
Warm carbon dioxide, blowing temperature T are 160 DEG C, and foamed time t (minute) meets lower formula：
T=0.227* (T-150)2+0.004083*(P-17.5)4+ 40, (wherein t is 63min；T is 160 DEG C, and P is
18MPa)；
(3) after reaching diffusion dissolution balance, gas in the rapid venting flat board foaming mould of rapid decompression system simultaneously passes through
Gas recovery system is reclaimed, and mould die sinking, polypropylene motherboard is ejected and foamed out of mould, obtains polypropylene microporous expanded material
20.9mm。
Embodiment 8
A kind of production method of the homogeneous slab of polypropylene microporous foaming structure, using flat board foaming machine to polypropylene motherboard
Foamed, motherboard is the homogeneous sheet material of structure, and specific foaming process comprises the following steps：
(1) flat board foaming mould temperature is increased to blowing temperature, 148 DEG C of blowing temperature；
(2) the homogeneous polypropylene motherboard (22mm) of structure is put into flat board foaming mould, hydraulic system driving flat board hair
Mould matched moulds is steeped, hydraulic system is forced into 30MPa, and gases at high pressure induction system imports 25MPa height into flat board foaming mould
Warm carbon dioxide, blowing temperature T are 148 DEG C, and foamed time t (minute) meets lower formula：
T=0.227* (T-150)2+0.004083*(P-17.5)4+ 40, (wherein t is 54min；T is 148 DEG C, and P is
25MPa)；
(4) after reaching diffusion dissolution balance, gas in the rapid venting flat board foaming mould of rapid decompression system simultaneously passes through
Gas recovery system is reclaimed, and mould die sinking, polypropylene motherboard is ejected and foamed out of mould, obtains polypropylene microporous expanded material
64.3mm。
Embodiment 9
A kind of production method of the homogeneous slab of polypropylene microporous foaming structure, using flat board foaming machine to polypropylene motherboard
Foamed, motherboard is the homogeneous sheet material of structure, and specific foaming process comprises the following steps：
(1) flat board foaming mould temperature is increased to blowing temperature, 148 DEG C of blowing temperature；
(2) the homogeneous polypropylene motherboard (7mm) of structure is put into flat board foaming mould, hydraulic system driving flat board foaming
Mould matched moulds, hydraulic system are forced into 10MPa, and gases at high pressure induction system imports 5MPa high temperature two into flat board foaming mould
Carbon oxide gas, blowing temperature T are 148 DEG C, and foamed time t (minute) meets lower formula：
T=0.227* (T-150)2+0.004083*(P-17.5)4+ 40, (wherein t is 141min；T is 148 DEG C, and P is
5MPa)；
(4) after reaching diffusion dissolution balance, gas in the rapid venting flat board foaming mould of rapid decompression system simultaneously passes through
Gas recovery system is reclaimed, and mould die sinking, polypropylene motherboard is ejected and foamed out of mould, obtains polypropylene microporous expanded material
13.4mm。
Expanded material prepared by embodiment 1-9 is contrasted with comparative example, wherein comparative example be according to
The expanded material with core bore prepared by CN201210443118 embodiments 4, embodiment 1 prepare the foaming structure of expanded material with
As depicted in figs. 1 and 2, performance indications contrast is as shown in table 1 for the contrast of comparative example：
The performance comparison of 1 expanded material of the present invention of table and the expanded material with core
It can be clearly apparent by Fig. 1 and Fig. 2 contrast, inside the expanded material prepared by CN201210443118 embodiments 4
The cavity that core is left be present, due to the empty presence, first in the following process of sheet material, the cavity left cannot function as
Sheet material uses, and produces substantial amounts of waste material, and the foamed material structure prepared by method described herein is homogeneous is asked in the absence of this
Topic；Secondly, cavity becomes big to cored structure after expanding, configurations, makes expanded material overall structure heterogeneity, it is whole to influence sheet material
Mechanical performance, the heat-insulating property of body, this harmful effect is more obvious in the case where expansion ratio is bigger, and herein described
Method no matter expansion ratio size, can realize that structure is homogeneous, function admirable, equally be for example 28 times of expansion ratio
Under, low more of its intensity of the polypropylene foamed plate with core non-core polypropylene foamed plate more homogeneous than structure, specifically
As shown in table 2, contrasted by table 2 visible, its tensile strength and compressive strength present significant difference, wherein non-core knot
The tensile strength of the foaming thick plate of structure about improves 50.4%, and compressive strength then improves 25.6%.The expansion ratio of table 2 is 28 times
When with cored structure and without cored structure foaming material performance contrast
| With core | Non-core | |
| Tensile strength (MPa) | 0.717949 | 1.079487 |
| Compressive strength (MPa) | 0.273333 | 0.343189 |
Embodiment 10
A kind of preparation method of polypropylene motherboard used in embodiment 1-9, is prepared, completely by extrusion molding production line
Extruding production line include batch mixer, screw extruder, flat-plate special extrusion die, cooling and shaping platform, spray water tank, hauling machine and
Cutting machine；Specifically preparation process is：
(1) pp material is sucked into screw extruder hopper, in 70-80 DEG C of drying, pp material used is logical
With grade polypropylene, specifically HOPP or atactic copolymerized polypropene.Melt index is 0.1-5.0g/10min, preferably 1.0-
3.0g/10min；
(2) dried raw material is by the plasticizing of screw extruder, mixing, the parameter setting of screw extruder：Screw rod
160-250 DEG C of temperature, 160-180 DEG C of die head temperature, melt pressure 5-15MPa, engine speed 10-50rpm；
(3) melt polypropylene plastified is molded by flat-plate special extrusion die；
(4) the polypropylene extrusion board of molten state under the pulling force of hauling machine by cooling and shaping platform, obtain preliminary cooling and
Sizing, the pulling speed of hauling machine are：10-50cm/min, the temperature of cooling and shaping platform is 5-20 DEG C；
(5) tentatively sizing polypropylene extrusion board enters spray water tank after going out cooling and shaping platform, further cooling, sprays water temperature
10-30℃；
(6) the polypropylene extrusion board through spray is cut by cutting machine by certain length, obtains polypropylene motherboard.
In addition, according to the requirement of specific product, the addition of auxiliary agent, tool can be also carried out to the pp material in step (1)
Body addition proportioning and mixed method are：The parts by weight of pp material 100, color masterbatch 0-2 parts by weight, inorganic filler 0-10 weight
Part, fire retardant 0-30 parts by weight, antistatic additive 0-15 parts by weight, after being pre-mixed by batch mixer, then suck screw extruder material
Bucket, in 70-80 DEG C of drying；Whether above-mentioned auxiliary agent adds and species determines according to specific product requirement, wherein fire retardant and anti-
Electrostatic agent realizes fire resistance and antistatic property respectively, the application field higher to fire protection requirement, typically requires that polypropylene is sent out
Foam material has fire resistance, now adds fire retardant；And pack application field in electronic product, then typically require that polypropylene is sent out
Foam material has antistatic property, now adds antistatic additive.
Claims (10)
1. a kind of production method of homogeneous polypropylene microporous foaming structure slab, it is characterised in that specific process is included such as
Lower step：
(1) flat board foaming mould is warming up to blowing temperature by the temperature control system for providing heat；
(2) the homogeneous polypropylene motherboard of structure is put into flat board foaming mould, hydraulic system driving flat board foaming mould matched moulds,
Hydraulic system is forced into 10-35MPa, and gases at high pressure induction system imports high temperature and high pressure gas, high temperature into flat board foaming mould
The pressure of gases at high pressure is 5-30MPa, and blowing temperature and time need to meet：T=0.227* (T-150)2+0.004083*(P-
17.5)4+ 40, wherein t are foamed time/min；T be blowing temperature/DEG C；P is blow pressure/MPa, i.e. high temperature and high pressure gas
Pressure, the gas of HTHP enter polymeric matrix from the diffusion into the surface of polypropylene motherboard；
(3) after reaching dissolution equilibrium, gas in the quick venting flat board foaming mould of rapid decompression system is simultaneously reclaimed by gas
System is reclaimed, and mould die sinking, polypropylene motherboard is ejected and foamed out of mould, obtains polypropylene microporous expanded material.
2. the production method of homogeneous polypropylene microporous foaming structure slab according to claim 1, it is characterised in that t
Value is 30-250min.
3. the production method of homogeneous polypropylene microporous foaming structure slab according to claim 1, it is characterised in that institute
The thickness for stating polypropylene mother matrix is 2-30mm.
4. the production method of homogeneous polypropylene microporous foaming structure slab according to claim 1, it is characterised in that institute
The blowing temperature stated is less than polyacrylic fusing point.
5. the production method of homogeneous polypropylene microporous foaming structure slab according to claim 1, it is characterised in that institute
The high temperature and high pressure gas stated are carbon dioxide or the mixture of nitrogen or the two arbitrary proportion.
6. the production method of homogeneous polypropylene microporous foaming structure slab according to claim 1, it is characterised in that institute
The flat board foaming mould stated has encapsulant, and the encapsulant is any one of beryllium copper, aluminium, graphite or polytetrafluoroethylene (PTFE)
Or a variety of compound.
7. the production method of homogeneous polypropylene microporous foaming structure slab according to claim 1, it is characterised in that institute
The polypropylene motherboard stated, is prepared by extrusion molding production line, complete extruding production line include batch mixer, screw extruder,
Flat-plate special extrusion die, cooling and shaping platform, spray water tank, hauling machine and cutting machine；Specifically preparation process is：
(1) pp material is sucked into screw extruder hopper, in 70-80 DEG C of drying；
(2) dried raw material is by the plasticizing of screw extruder, mixing, the parameter setting of screw extruder：Extruder temperature
160-250 DEG C, 160-180 DEG C of die head temperature, melt pressure 5-15MPa, engine speed 10-50rpm；
(3) melt polypropylene plastified is molded by flat-plate special extrusion die；
(4) the polypropylene extrusion board of molten state is tentatively cooled down and shaped by cooling and shaping platform under the pulling force of hauling machine,
The pulling speed of hauling machine is：10-50cm/min, the temperature of cooling and shaping platform is 5-20 DEG C；
(5) tentatively sizing polypropylene extrusion board enters spray water tank after going out cooling and shaping platform, further cooling, spray water temperature 10-
30℃；
(6) the polypropylene extrusion board through spray is cut by cutting machine by certain length, obtains polypropylene motherboard.
8. the production method of homogeneous polypropylene microporous foaming structure slab according to claim 7, it is characterised in that institute
The pp material stated is general grade polypropylene, specifically HOPP or atactic copolymerized polypropene, melt index 0.1-
5.0g/10min。
9. the production method of homogeneous polypropylene microporous foaming structure slab according to claim 7, it is characterised in that step
Suddenly the pp material described in (1), auxiliary agent is added, after being pre-mixed by batch mixer, then screw extruder hopper is sucked, in 70-
80 DEG C of drying.
10. the production method of homogeneous polypropylene microporous foaming structure slab according to claim 9, it is characterised in that
Described auxiliary agent includes color masterbatch, inorganic filler, fire retardant, antistatic additive, is counted by 100 parts by weight of polypropylene, color masterbatch 0-2
Parts by weight, inorganic filler 0-10 parts by weight, fire retardant 0-30 parts by weight, antistatic additive 0-15 parts by weight.
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|---|---|---|---|
| CN201410796692.5A CN104476711B (en) | 2014-12-18 | 2014-12-18 | A kind of production method of homogeneous polypropylene expanded slab |
| PCT/CN2015/070718 WO2016095305A1 (en) | 2014-12-18 | 2015-01-15 | Method for producing uniform thick polypropylene foaming plate |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410796692.5A CN104476711B (en) | 2014-12-18 | 2014-12-18 | A kind of production method of homogeneous polypropylene expanded slab |
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| CN107775862B (en) * | 2016-08-27 | 2019-09-27 | 华东理工大学 | A kind of polyester foamed plate preparation method of efficient green |
| CN107866980A (en) * | 2016-09-27 | 2018-04-03 | 东莞市杰伟机械制造有限公司 | PP co-extrusion foaming slab extruding production lines |
| CN109940779A (en) * | 2018-12-29 | 2019-06-28 | 浙江华正新材料股份有限公司 | A kind of preparation method and system of the polypropylene expanded plate of sound-insulating lightweight |
| CN116120621B (en) * | 2022-12-20 | 2023-10-13 | 四川大学 | Triboelectric regenerated product based on waste polypropylene and preparation method thereof |
| CN116589787A (en) * | 2023-03-24 | 2023-08-15 | 重庆长安汽车股份有限公司 | Foamed polypropylene board and preparation method thereof, wheel cover lining plate and preparation method thereof, and vehicle |
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| CN102167840B (en) * | 2011-04-12 | 2012-09-05 | 姜修磊 | Method for preparing polymer microporous foaming material by supercritical mould foaming |
| CN103042647B (en) * | 2012-11-08 | 2015-05-20 | 江苏微赛新材料科技有限公司 | Method for producing polypropylene micro-porous foamed thick board |
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