CN104476711A - Method for producing uniform thick polypropylene micropore foaming plate - Google Patents
Method for producing uniform thick polypropylene micropore foaming plate Download PDFInfo
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- CN104476711A CN104476711A CN201410796692.5A CN201410796692A CN104476711A CN 104476711 A CN104476711 A CN 104476711A CN 201410796692 A CN201410796692 A CN 201410796692A CN 104476711 A CN104476711 A CN 104476711A
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- polypropylene
- foaming
- temperature
- dull
- mould
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- 238000005187 foaming Methods 0.000 title claims abstract description 126
- 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 105
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 28
- 239000000463 material Substances 0.000 claims abstract description 59
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 27
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 15
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 15
- 238000009792 diffusion process Methods 0.000 claims abstract description 15
- 239000007789 gas Substances 0.000 claims description 57
- 238000007664 blowing Methods 0.000 claims description 39
- 239000006260 foam Substances 0.000 claims description 28
- 238000001125 extrusion Methods 0.000 claims description 20
- 230000008569 process Effects 0.000 claims description 17
- 238000007493 shaping process Methods 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 12
- 238000004090 dissolution 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
- 238000011084 recovery Methods 0.000 claims description 11
- 238000013022 venting Methods 0.000 claims description 11
- 239000000654 additive Substances 0.000 claims description 9
- 230000000996 additive effect Effects 0.000 claims description 9
- 238000005520 cutting process Methods 0.000 claims description 9
- 239000003063 flame retardant Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000002360 preparation method Methods 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
- 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
- 239000000203 mixture Substances 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
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 238000004513 sizing Methods 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
- 150000001875 compounds Chemical class 0.000 claims description 2
- 239000010439 graphite Substances 0.000 claims description 2
- 229910002804 graphite Inorganic materials 0.000 claims description 2
- 238000010792 warming Methods 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 abstract description 10
- 230000006378 damage Effects 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract 1
- 230000002195 synergetic effect Effects 0.000 abstract 1
- 239000006261 foam material Substances 0.000 description 11
- 229920000642 polymer Polymers 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 4
- 206010000269 abscess Diseases 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000004806 packaging method and process 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
- 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 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 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
- 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
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 method for producing a uniform thick polypropylene micropore foaming plate. The method is mainly characterized in that foaming pressure, temperature and time need to meet a formula described in the specification, wherein t is the foaming time/minute, T is the foaming temperature/DEG C, P is the foaming pressure/MPa, namely the pressure of high-temperature and high-pressure gas, and the value of t is within 30-250min, preferably, t is within 40-230min. The method disclosed by the invention can be used for achieving the easiness for the diffusion of carbon dioxide under the condition of the foaming time, temperature and pressure through fixed synergetic relation, preventing the damage of carbon dioxide gas flow on polypropylene, overcoming the technical defect that the direct foaming of a thick plate can not be achieved all the time in the prior art, and achieving the purpose of obtaining a polypropylene micropore foaming material with a high foaming ratio, a small aperture size, high cell density, high thickness and uniformity in structure and obtaining a foaming material with foaming thickness being more than 10mm.
Description
Technical field
The present invention relates to high molecular foam material preparing technical field, the production method of a kind of homogeneous polypropylene microporous foaming structure slab of specific design.
Background technology
Polymer micro expanded material refers in particular to abscess to be less than size 100 μm, and hole density is greater than 1.0 × 10
6individual/cm
3polyalcohol stephanoporate expanded material.Due to its high-strength light had, save the features such as material, microcellular foam material is with a wide range of applications.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 is easy to recycling use.By using supercritical carbon dioxide or supercritical nitrogen to foam the polypropylene microporous expanded material obtained, cleanliness without any pollution.Especially, the polypropylene microporous foaming plate that products thickness is larger, as thickness is greater than the desirable core that 10mm is sandwich core filled composite material, can be applicable to the thermal insulation board of thermal car, refrigerator car, the ceiling, floor etc. of automobile, passenger vehicle and rail traffic vehicles, and be applied to the heat-insulation and heat-preservation of boats and ships, building etc.
Common continuous extrusion foaming method is difficult to obtained polypropylene expanded slab.The restriction of the factors such as the rate of pressure reduction gone out by material resin, gas dispersion level in the melt, die head, the heat of foaming body core remove, continuous extrusion foaming is suitable only for that to produce thickness relatively little, and general thickness is less than the microporous foam sheet material of 5mm.
Solid-state foaming is the common method preparing polymer micro expanded material.Solid-state foaming process refers to the flowing temperature of blowing temperature lower than polymer, under polymer is still in solid-state condition, is that gases at high pressure dissolving diffuses into polymeric matrix, is then induced the foaming process of cell nucleation and growth by quick pressure releasing.In solid-state foaming process, gases at high pressure penetrate into polymeric matrix by molecular diffusion effect, and the saturation time reaching diffusive equilibrium depends on blowing temperature, gas pressure, fluoropolymer resin kind and thickness thereof.For common solid-state foaming process, the diffusion velocity of gas in most polymers is comparatively slow, and the saturation time reached needed for dissolution equilibrium is longer.Particularly along with the increase of products thickness, saturation time will extend greatly.Therefore, current solid-state foaming is often applied to prepares the less sheet material of thickness, and when preparing thickness larger microporous foam sheet material, abscess is uneven, and foam consuming time longer, efficiency is lower.
Chinese patent PCT/CN2012/084503 discloses a kind of production method of polypropylene microporous foaming thick plate, and the method adopts the polypropylene board with core to be motherboard, adopts dull and stereotyped foaming machine to foam.Due to the cored structure of motherboard, there is the cavity that core is left in the foaming plate inside that the method obtains, overall structure heterogeneity, and cored structure after expanding cavity becomes large, and configurations, affects the mechanical performance of sheet material entirety, heat-insulating property.Meanwhile, in the following process of sheet material, the cavity that core is left over can not use as sheet material, and produces a large amount of waste materials.
Summary of the invention
For the deficiency that above-mentioned prior art exists, the invention provides a kind of production method of homogeneous polypropylene microporous foaming structure slab, concrete process comprises the steps:
(1) provide the temperature control system of heat that dull and stereotyped foaming mould is warming up to blowing temperature;
(2) polypropylene motherboard homogeneous for structure is put into dull and stereotyped foaming mould, hydraulic system drives dull and stereotyped foaming mould matched moulds, hydraulic system is forced into 10-35MPa, gases at high pressure induction system imports high temperature and high pressure gas in dull and stereotyped foaming mould, the pressure of high temperature and high pressure gas is 5-30MPa, preferred 5-25MPa, blowing temperature and time need meet: t=0.227* (T-150)
2+ 0.004083* (P-17.5)
4+ 40, wherein t is 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, and wherein, t value is 30-250min, preferred 40-230min; The gas of HTHP enters polymeric matrix from the diffusion into the surface of polypropylene motherboard;
(3), after reaching dissolution equilibrium, the gas in the dull and stereotyped foaming mould of the quick venting of rapid decompression system is also reclaimed by gas recovery system, mould die sinking, and polypropylene motherboard ejects and foams in mould, obtains polypropylene microporous expanded material.
The thickness of described polypropylene mother matrix is 2-30mm.
Described blowing temperature lower than polyacrylic fusing point, preferably, blowing temperature 130-160 DEG C;
Described high temperature and high pressure gas is the mixture of carbon dioxide or nitrogen or the two arbitrary proportion;
Described dull and stereotyped foaming mould has encapsulant, and described encapsulant is any one or multiple compound of beryllium copper, aluminium, graphite or polytetrafluoroethylene (PTFE).
Described polypropylene motherboard, is prepared by extrusion molding production line, and complete extruding production line comprises batch mixer, screw extruder, flat-plate special extrusion die, cooling and shaping platform, spray water tank, hauling machine and cutting machine; Concrete preparation process is:
(1) pp material is sucked screw extruder hopper, 70-80 DEG C of oven dry;
(2) dried raw material is by the plasticizing of screw extruder, and mix, the setting parameter of screw extruder is: extruder temperature 160-250 DEG C, die head temperature 160-180 DEG C, melt pressure 5-15MPa, engine speed 10-50rpm;
(3) melt polypropylene plastified is shaping by flat-plate special extrusion die;
(4) the polypropylene extrusion board of molten state is by cooling and shaping platform under the pulling force of hauling machine, and tentatively cooled and shape, the pulling speed of hauling machine is: 10-50cm/min, and the temperature of cooling and shaping platform is 5-20 DEG C;
(5) enter spray water tank after preliminary sizing polypropylene extrusion board goes out cooling and shaping platform, cool further, spray water temperature 10-30 DEG C;
(6) the polypropylene extrusion board through spray presses certain length cutting by cutting machine, obtains polypropylene motherboard
Described pp material is general purpose grade polypropylene, specifically HOPP or atactic copolymerized polypropene.Melt index is 0.1-5.0g/10min, preferred 1.0-3.0g/10min.
Pp material described in step (1), adds auxiliary agent, after batch mixer premixed, then sucks screw extruder hopper, 70-80 DEG C of oven dry; Described auxiliary agent comprises color masterbatch, inorganic filler, fire retardant, antistatic additive, is 100 parts by weight with polypropylene, color masterbatch 0-2 weight portion, inorganic filler 0-10 weight portion, fire retardant 0-30 weight portion, antistatic additive 0-15 weight portion; Whether described auxiliary agent adds and kind determines according to specific product requirement, wherein fire retardant and antistatic additive realize fire resistance and antistatic property respectively, the application higher to fire protection requirement, General Requirements PP foam material has fire resistance, now adds fire retardant; And in electronic product packaging application, then General Requirements PP foam material has antistatic property, now adds antistatic additive.
Compared with prior art, the invention has the advantages that: the temperature and pressure condition adopting foaming of the present invention, by fixing conspiracy relation, be easy to titanium dioxide Carbon diffusion, also avoid carbon dioxide gas stream to polyacrylic destruction simultaneously, overcome the technology barrier that prior art cannot realize direct foaming thick plate always, achieve that to obtain expansion ratio large, aperture size is little, cell density is high, thickness is comparatively large, and the object of the polypropylene microporous expanded material that structure is homogeneous, can realize the expanded material that foam thickness is greater than 10mm.This foaming plate overall mechanical properties is good, heat-insulating property is superior; A foaming machine can assemble multi-layer planar mould simultaneously, and production efficiency is higher.
Accompanying drawing explanation
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 of the foaming thick plate having core bore in comparative example.
Detailed description of the invention
Characterizing method is as follows:
Obtain the apparent density of microcellular foam material according to ISO845 standard testing, the expansion ratio of final microcellular foam material can be calculated.Expansion ratio R
ex=ρ
polymer/ ρ
foam, wherein ρ
polymerfor the density of non-foamable polymer, ρ
foamfor the apparent density of microcellular foam material.
The hot strength of microcellular foam material is recorded respectively, compressive strength according to ISO1798, ISO844 and ISO8067.
Embodiment 1
A production method for the homogeneous slab of polypropylene microporous foaming structure, adopts dull and stereotyped foaming machine to foam to polypropylene motherboard, and motherboard is the homogeneous sheet material of structure, and concrete foaming process comprises the steps:
(1) dull and stereotyped foaming mould temperature is increased to blowing temperature, blowing temperature 148 DEG C;
(2) polypropylene motherboard (11mm) homogeneous for structure is put into dull and stereotyped foaming mould, hydraulic system drives dull and stereotyped foaming mould matched moulds, hydraulic system is forced into 30MPa, gases at high pressure induction system imports the carbon dioxide of 18MPa in dull and stereotyped foaming mould, blowing temperature T is 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, the gas in the dull and stereotyped foaming mould of the rapid venting of rapid decompression system is also reclaimed by gas recovery system, mould die sinking, and polypropylene motherboard ejects and foams in mould, obtains polypropylene microporous expanded material 25.2mm.
Embodiment 2
A production method for the homogeneous slab of polypropylene microporous foaming structure, adopts dull and stereotyped foaming machine to foam to polypropylene motherboard, and motherboard is the homogeneous sheet material of structure, and concrete foaming process comprises the steps;
(1) dull and stereotyped foaming mould temperature is increased to blowing temperature, blowing temperature 160 DEG C;
(2) polypropylene motherboard (17mm) homogeneous for structure is put into dull and stereotyped foaming mould, hydraulic system drives dull and stereotyped foaming mould matched moulds, hydraulic system is forced into 30MPa, gases at high pressure induction system imports the high temperature carbon dioxide gas of 25MPa in dull and stereotyped foaming mould, blowing temperature T is 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, the gas in the dull and stereotyped foaming mould of the rapid venting of rapid decompression system is also reclaimed by gas recovery system, mould die sinking, and polypropylene motherboard ejects and foams in mould, obtains polypropylene microporous expanded material 49.7mm.
Embodiment 3
A production method for the homogeneous slab of polypropylene microporous foaming structure, adopts dull and stereotyped foaming machine to foam to polypropylene motherboard, and motherboard is the homogeneous sheet material of structure, and concrete foaming process comprises the steps:
(1) dull and stereotyped foaming mould temperature is increased to blowing temperature, blowing temperature 130 DEG C;
(2) polypropylene motherboard (3m m) homogeneous for structure is put into dull and stereotyped foaming mould, hydraulic system drives dull and stereotyped foaming mould matched moulds, hydraulic system is forced into 10MPa, gases at high pressure induction system imports the high temperature carbon dioxide gas of 5MPa in dull and stereotyped foaming mould, blowing temperature T is 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, the gas in the dull and stereotyped foaming mould of the rapid venting of rapid decompression system is also reclaimed by gas recovery system, mould die sinking, and polypropylene motherboard ejects and foams in mould, obtains polypropylene microporous expanded material 7.7mm.
Embodiment 4
A production method for the homogeneous slab of polypropylene microporous foaming structure, adopts dull and stereotyped foaming machine to foam to polypropylene motherboard, and motherboard is the homogeneous sheet material of structure, and concrete foaming process comprises the steps:
(1) dull and stereotyped foaming mould temperature is increased to blowing temperature, blowing temperature 130 DEG C;
(2) polypropylene motherboard (18mm) homogeneous for structure is put into dull and stereotyped foaming mould, hydraulic system drives dull and stereotyped foaming mould matched moulds, hydraulic system is forced into 30MPa, gases at high pressure induction system imports the high temperature carbon dioxide gas of 25MPa in dull and stereotyped foaming mould, blowing temperature T is 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, the gas in the dull and stereotyped foaming mould of the rapid venting of rapid decompression system is also reclaimed by gas recovery system, mould die sinking, and polypropylene motherboard ejects and foams in mould, obtains polypropylene microporous expanded material 30.8mm.
Embodiment 5
A production method for the homogeneous slab of polypropylene microporous foaming structure, adopts dull and stereotyped foaming machine to foam to polypropylene motherboard, and motherboard is the homogeneous sheet material of structure, and concrete foaming process comprises the steps:
(1) dull and stereotyped foaming mould temperature is increased to blowing temperature, blowing temperature 130 DEG C;
(2) polypropylene motherboard (9mm) homogeneous for structure is put into dull and stereotyped foaming mould, hydraulic system drives dull and stereotyped foaming mould matched moulds, hydraulic system is forced into 30MPa, gases at high pressure induction system imports the high temperature carbon dioxide gas of 18MPa in dull and stereotyped foaming mould, blowing temperature T is 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, the gas in the dull and stereotyped foaming mould of the rapid venting of rapid decompression system is also reclaimed by gas recovery system, mould die sinking, and polypropylene motherboard ejects and foams in mould, obtains polypropylene microporous expanded material 18mm.
Embodiment 6
A production method for the homogeneous slab of polypropylene microporous foaming structure, adopts dull and stereotyped foaming machine to foam to polypropylene motherboard, and motherboard is the homogeneous sheet material of structure, and concrete foaming process comprises the steps:
(1) dull and stereotyped foaming mould temperature is increased to blowing temperature, blowing temperature 160 DEG C;
(2) polypropylene motherboard (5mm) homogeneous for structure is put into dull and stereotyped foaming mould, hydraulic system drives dull and stereotyped foaming mould matched moulds, hydraulic system is forced into 35MPa, gases at high pressure induction system imports the high temperature carbon dioxide gas of 30MPa in dull and stereotyped foaming mould, blowing temperature T is 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, the gas in the dull and stereotyped foaming mould of the rapid venting of rapid decompression system is also reclaimed by gas recovery system, mould die sinking, and polypropylene motherboard ejects and foams in mould, obtains polypropylene microporous expanded material 15.5mm.
Embodiment 7
A production method for the homogeneous slab of polypropylene microporous foaming structure, adopts dull and stereotyped foaming machine to foam to polypropylene motherboard, and motherboard is the homogeneous sheet material of structure, and concrete foaming process comprises the steps:
(1) dull and stereotyped foaming mould temperature is increased to blowing temperature, blowing temperature 160 DEG C;
(2) polypropylene motherboard (10mm) homogeneous for structure is put into dull and stereotyped foaming mould, hydraulic system drives dull and stereotyped foaming mould matched moulds, hydraulic system is forced into 30MPa, gases at high pressure induction system imports the high temperature carbon dioxide gas of 18MPa in dull and stereotyped foaming mould, blowing temperature T is 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, the gas in the dull and stereotyped foaming mould of the rapid venting of rapid decompression system is also reclaimed by gas recovery system, mould die sinking, and polypropylene motherboard ejects and foams in mould, obtains polypropylene microporous expanded material 20.9mm.
Embodiment 8
A production method for the homogeneous slab of polypropylene microporous foaming structure, adopts dull and stereotyped foaming machine to foam to polypropylene motherboard, and motherboard is the homogeneous sheet material of structure, and concrete foaming process comprises the steps:
(1) dull and stereotyped foaming mould temperature is increased to blowing temperature, blowing temperature 148 DEG C;
(2) polypropylene motherboard (22mm) homogeneous for structure is put into dull and stereotyped foaming mould, hydraulic system drives dull and stereotyped foaming mould matched moulds, hydraulic system is forced into 30MPa, gases at high pressure induction system imports the high temperature carbon dioxide gas of 25MPa in dull and stereotyped foaming mould, blowing temperature T is 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, the gas in the dull and stereotyped foaming mould of the rapid venting of rapid decompression system is also reclaimed by gas recovery system, mould die sinking, and polypropylene motherboard ejects and foams in mould, obtains polypropylene microporous expanded material 64.3mm.
Embodiment 9
A production method for the homogeneous slab of polypropylene microporous foaming structure, adopts dull and stereotyped foaming machine to foam to polypropylene motherboard, and motherboard is the homogeneous sheet material of structure, and concrete foaming process comprises the steps:
(1) dull and stereotyped foaming mould temperature is increased to blowing temperature, blowing temperature 148 DEG C;
(2) polypropylene motherboard (7mm) homogeneous for structure is put into dull and stereotyped foaming mould, hydraulic system drives dull and stereotyped foaming mould matched moulds, hydraulic system is forced into 10MPa, gases at high pressure induction system imports the high temperature carbon dioxide gas of 5MPa in dull and stereotyped foaming mould, blowing temperature T is 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, the gas in the dull and stereotyped foaming mould of the rapid venting of rapid decompression system is also reclaimed by gas recovery system, mould die sinking, and polypropylene motherboard ejects and foams in mould, obtains polypropylene microporous expanded material 13.4mm.
Expanded material prepared by embodiment 1-9 and comparative example are contrasted, wherein comparative example is the expanded material according to the band core bore prepared by CN201210443118 embodiment 4, embodiment 1 prepares the contrast of the foaming structure of expanded material and comparative example as depicted in figs. 1 and 2, and performance indications contrast is as shown in table 1:
Table 1 expanded material of the present invention and the performance comparison with the expanded material of core
Can clearly be seen by the contrast of Fig. 1 and Fig. 2, there is the cavity that core is left in the expanded material inside prepared by CN201210443118 embodiment 4, due to the existence in this cavity, first in the following process of sheet material, the cavity left over can not use as sheet material, produce a large amount of waste materials, and the foamed material structure prepared by method described in the application is homogeneous there is not this problem, secondly, cored structure after expanding cavity becomes large, configurations, make expanded material overall structure heterogeneity, affect the mechanical performance of sheet material entirety, heat-insulating property, this harmful effect, when expansion ratio is larger, more obvious, and method described in the application no matter expansion ratio size, it is equal that to realize structure homogeneous, function admirable, for example under being equally all expansion ratios of 28 times, with homogeneous low many without core polypropylene foamed plate of its strength ratio structure of polypropylene foamed plate of core, specifically as shown in table 2, contrasted visible by table 2, its hot strength and compressive strength all present significant difference, hot strength wherein without the foaming thick plate of cored structure about improves 50.4%, compressive strength then improves 25.6%.Contrast with cored structure with without the foaming material performance of cored structure when table 2 expansion ratio is 28 times
| With core | Without core | |
| Hot strength (MPa) | 0.717949 | 1.079487 |
| Compressive strength (MPa) | 0.273333 | 0.343189 |
Embodiment 10
A preparation method for the polypropylene motherboard that embodiment 1-9 is used, is prepared by extrusion molding production line, and complete extruding production line comprises batch mixer, screw extruder, flat-plate special extrusion die, cooling and shaping platform, spray water tank, hauling machine and cutting machine; Concrete preparation process is:
(1) pp material is sucked screw extruder hopper, 70-80 DEG C of oven dry, pp material used is general purpose grade polypropylene, specifically HOPP or atactic copolymerized polypropene.Melt index is 0.1-5.0g/10min, preferred 1.0-3.0g/10min;
(2) dried raw material is by the plasticizing of screw extruder, and mix, the setting parameter of screw extruder is: extruder temperature 160-250 DEG C, die head temperature 160-180 DEG C, melt pressure 5-15MPa, engine speed 10-50rpm;
(3) melt polypropylene plastified is shaping by flat-plate special extrusion die;
(4) the polypropylene extrusion board of molten state is by cooling and shaping platform under the pulling force of hauling machine, and tentatively cooled and shape, the pulling speed of hauling machine is: 10-50cm/min, and the temperature of cooling and shaping platform is 5-20 DEG C;
(5) enter spray water tank after preliminary sizing polypropylene extrusion board goes out cooling and shaping platform, cool further, spray water temperature 10-30 DEG C;
(6) the polypropylene extrusion board through spray presses certain length cutting by cutting machine, obtains polypropylene motherboard.
In addition, according to the requirement of specific product, the interpolation of auxiliary agent also can be carried out to the pp material in step (1), concrete interpolation proportioning and mixed method are: pp material 100 weight portion, color masterbatch 0-2 weight portion, inorganic filler 0-10 weight portion, fire retardant 0-30 weight portion, antistatic additive 0-15 weight portion, after batch mixer premixed, then suck screw extruder hopper, 70-80 DEG C of oven dry; Whether above-mentioned auxiliary agent adds and kind determines according to specific product requirement, wherein fire retardant and antistatic additive realize fire resistance and antistatic property respectively, the application higher to fire protection requirement, General Requirements PP foam material has fire resistance, now adds fire retardant; And in electronic product packaging application, then General Requirements PP foam material has antistatic property, now adds antistatic additive.
Claims (10)
1. a production method for homogeneous polypropylene microporous foaming structure slab, it is characterized in that, concrete process comprises the steps:
(1) provide the temperature control system of heat that dull and stereotyped foaming mould is warming up to blowing temperature;
(2) polypropylene motherboard homogeneous for structure is put into dull and stereotyped foaming mould, hydraulic system drives dull and stereotyped foaming mould matched moulds, hydraulic system is forced into 10-35MPa, gases at high pressure induction system imports high temperature and high pressure gas in dull and stereotyped foaming mould, the pressure of high temperature and high pressure gas is 5-30MPa, preferred 5-25MPa, blowing temperature and time need meet: t=0.227* (T-150)
2+ 0.004083* (P-17.5)
4+ 40, wherein t is 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, and the gas of HTHP enters polymeric matrix from the diffusion into the surface of polypropylene motherboard;
(3), after reaching dissolution equilibrium, the gas in the dull and stereotyped foaming mould of the quick venting of rapid decompression system is also reclaimed by gas recovery system, mould die sinking, and polypropylene motherboard ejects and foams in mould, obtains polypropylene microporous expanded material.
2. the production method of homogeneous polypropylene microporous foaming structure slab according to claim 1, it is characterized in that, t value is 30-250min, preferred 40-230min.
3. the production method of homogeneous polypropylene microporous foaming structure slab according to claim 1, is characterized in that, the thickness of described polypropylene mother matrix is 2-30mm.
4. the production method of homogeneous polypropylene microporous foaming structure slab according to claim 1, is characterized in that, described blowing temperature lower than polyacrylic fusing point, preferably, blowing temperature 130-160 DEG C.
5. the production method of homogeneous polypropylene microporous foaming structure slab according to claim 1, it is characterized in that, described high temperature and high pressure gas is the mixture of carbon dioxide or nitrogen or the two arbitrary proportion.
6. the production method of homogeneous polypropylene microporous foaming structure slab according to claim 1, it is characterized in that, described dull and stereotyped foaming mould has encapsulant, and described encapsulant is any one or multiple compound of beryllium copper, aluminium, graphite or polytetrafluoroethylene (PTFE).
7. the preparation method of the polypropylene motherboard that an any one of claim 1-6 is used, it is characterized in that, prepared by extrusion molding production line, complete extruding production line comprises batch mixer, screw extruder, flat-plate special extrusion die, cooling and shaping platform, spray water tank, hauling machine and cutting machine; Concrete preparation process is:
(1) pp material is sucked screw extruder hopper, 70-80 DEG C of oven dry;
(2) dried raw material is by the plasticizing of screw extruder, and mix, the setting parameter of screw extruder is: extruder temperature 160-250 DEG C, die head temperature 160-180 DEG C, melt pressure 5-15MPa, engine speed 10-50rpm;
(3) melt polypropylene plastified is shaping by flat-plate special extrusion die;
(4) the polypropylene extrusion board of molten state is by cooling and shaping platform under the pulling force of hauling machine, and tentatively cooled and shape, the pulling speed of hauling machine is: 10-50cm/min, and the temperature of cooling and shaping platform is 5-20 DEG C;
(5) enter spray water tank after preliminary sizing polypropylene extrusion board goes out cooling and shaping platform, cool further, spray water temperature 10-30 DEG C;
(6) the polypropylene extrusion board through spray presses certain length cutting by cutting machine, obtains polypropylene motherboard.
8. the preparation method of polypropylene motherboard according to claim 7, it is characterized in that, described pp material is general purpose grade polypropylene, specifically HOPP or atactic copolymerized polypropene, melt index is 0.1-5.0g/10min, preferred 1.0-3.0g/10min.
9. the preparation method of polypropylene motherboard according to claim 7, is characterized in that, the pp material described in step (1), adds auxiliary agent, after batch mixer premixed, then sucks screw extruder hopper, 70-80 DEG C of oven dry.
10. the preparation method of polypropylene motherboard according to claim 9, it is characterized in that, described auxiliary agent comprises color masterbatch, inorganic filler, fire retardant, antistatic additive, be 100 parts by weight with polypropylene, color masterbatch 0-2 weight portion, inorganic filler 0-10 weight portion, fire retardant 0-30 weight portion, antistatic additive 0-15 weight portion.
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| PCT/CN2015/070718 WO2016095305A1 (en) | 2014-12-18 | 2015-01-15 | Method for producing uniform thick polypropylene foaming plate |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107775862A (en) * | 2016-08-27 | 2018-03-09 | 华东理工大学 | A kind of polyester foamed sheet material 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 |
| CN116120621A (en) * | 2022-12-20 | 2023-05-16 | 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 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103042647A (en) * | 2012-11-08 | 2013-04-17 | 江苏微赛新材料科技有限公司 | Method for producing polypropylene micro-porous foamed thick board |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102167840B (en) * | 2011-04-12 | 2012-09-05 | 姜修磊 | Method for preparing polymer microporous foaming material by supercritical mould foaming |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103042647A (en) * | 2012-11-08 | 2013-04-17 | 江苏微赛新材料科技有限公司 | Method for producing polypropylene micro-porous foamed thick board |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107775862A (en) * | 2016-08-27 | 2018-03-09 | 华东理工大学 | A kind of polyester foamed sheet material preparation method of efficient green |
| 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 |
| CN116120621A (en) * | 2022-12-20 | 2023-05-16 | 四川大学 | Triboelectric regenerated product based on waste polypropylene and preparation method thereof |
| 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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| CN104476711B (en) | 2017-11-28 |
| WO2016095305A1 (en) | 2016-06-23 |
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