CN101229682A - Method of semi-vitreous extrusion molding manufacturing for portiforium type millipore plastics extrusions - Google Patents
Method of semi-vitreous extrusion molding manufacturing for portiforium type millipore plastics extrusions Download PDFInfo
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- CN101229682A CN101229682A CNA2008100453966A CN200810045396A CN101229682A CN 101229682 A CN101229682 A CN 101229682A CN A2008100453966 A CNA2008100453966 A CN A2008100453966A CN 200810045396 A CN200810045396 A CN 200810045396A CN 101229682 A CN101229682 A CN 101229682A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
- B29C2948/92895—Barrel or housing
Abstract
The invention relates to a method for preparing opening micropore plastic material though slack-melting, extruding and molding. The method includes the processes: after reaching from a feeding device arranged on a double piston extruder to a heating material cylinder, preheating plastic powder with particle size of 40-1500 meshes is extruded by the piston driven by a hydraulic driver and compacted, transported and heated constantly; when the surface temperature of the plastic powder reaches the melt temperature of Tf plus or minus 20 DGE C, the power is extruded from a machine head and a die. Then, extruding matters are cooled and set by a cooling-traction device and the products are finished. By regulating the particle size of the powder, addictive and forming process conditions and so on, the invention can control opening rate, size and distribution of the aperture; the invention has simple process, short production cycle, low forming temperature and pressure as well as short forming time; besides, the invention can greatly reduce the production cost can not be degraded easily when the plastic is processed and can be widely applicable to molding of the opening micropore products of thermoplastic powders, thermosetting power and so on.
Description
Technical field
The invention belongs to open cell type micropore plastic product preparing technical field, be specifically related to a kind of method with semi-vitreous extrusion molding manufacturing for portiforium type millipore plastics extrusions.
Background technology
The open cell type micropore plastic product is meant to have the micropore that numerous aperture is 0.01～50um, and the plastic products that are interconnected between the Kong Yukong.Type millipore plastics extrusions comprises filtration tubing and plate, heat-insulating sound-insulating profile shapes (comprising sheet material, sheet material, the special-shaped plate of hollow, bar, tubing, band), composite shock-absorbing sheet plate and profile shapes, light composite wallboard etc., is widely used in fields such as water treatment, gas filtration, Separation of Solid and Liquid, biomedical engineering, building, communications and transportation.
At present, the method for preparing type millipore plastics extrusions mainly contains: the molten plastic extrusion molding---continuous extrusion molding of physical blowing and chemical blowing extrusion moulding, physics or machine drilling method and solid phase plastics extrusion molding---compression-sintering-extrusion moulding.
The continuous extrusion molding of physical blowing be with gas or supercritical fluid as blowing agent, force to be dissolved in the polymer melt, and utilize thermodynamic phase, make the blowing agent volatilization form micropore.(PolymerEngineering and Science such as C.B.Park for example, 1998,38 (11): 1812-1823) this method of human has been produced the high impact polystyrene microperforated sheet, and its technical process is: when high impact polystyrene after the fusion of extruder melt zone, inject N
2Or CO
2Gas make it to form two-phase mixture with molten polystyrene, and the abscess nucleation takes place in (higher-pressure region) in nozzle, and after melt left nozzle, abscess took place to increase and moulding simultaneously at last.
The chemical blowing extrusion moulding is to utilize CBA to produce gas in plastic melt, forms micropore, and typing simultaneously becomes the method for micropore continuity shape product.In chemical blowing extrusion molding process, plastics have been completed into melt, and abscess nucleation and abscess increase and all carry out in melt.
But the percent opening that the continuous extrusion molding of molten plastic forms the open cell type micropore plastic product is lower, and microcellular structure size and distribute wayward.
Physics or machine drilling method are to utilize laser or diamond dust drum-type punching machine in type film or thin slice reprocessing micropore.This class methods gained micro-pore diameter, height and pore size distribution are to determine that by pricking hole equipment and technology micro-pore diameter, height and percent opening adjustable extent are limited, and the production cost height fully.
Solid phase plastics extrusion molding comprises three phases: promptly cold pressing, sintering and extruding.It is 15mm ultra-high molecular mass polyethylene micropore cylinder that people such as K.L.Alderson (J.Materials Science, 30 (1995) 4087-4094) have prepared diameter with this method.Concrete operations are earlier the ultra-high molecular weight polyethylene powder to be filled in the mold cavity, be heated to 110 ℃, constant temperature 10 minutes is then with tamponade about 0.04GPa that exerts pressure, make the compression of ultra-high molecular weight polyethylene powder, and pressurize 20 minutes, take out strongly, slowly cool to room temperature, the more closely knit rod of cold moudling being put into constant is 160 ℃ cartridge heater, sintering 20 minutes is extruded sintered bar after the taking-up immediately under 160 ℃, to improve fento quantity and excellent intensity in the micropore ultra-high molecular weight polyethylene.
Mainly there is two large problems in the method that more than prepares the open cell type micropore plastic product: 1, complex process, and long flow path, the cost height is as compression-sintering-extrusion moulding and physics or machine drilling method; 2, micro-pore diameter and percent opening are difficult to be controlled according to product purpose, as the continuous extrusion molding of physical blowing, the chemical blowing method of forming.Therefore, the method for seeking a kind of new moulding type millipore plastics extrusions is to apply the problem that needs to be resolved hurrily in the type millipore plastics extrusions.
Summary of the invention
The objective of the invention is problem at the prior art existence, provide a kind of and can control type millipore plastics extrusions pore size and distribution, and percent opening, the moulding technological process can be simplified again, be convenient to controlling of production process, the new semi-molten extrusion molding processing method that reduces production costs.
The method of semi-vitreous extrusion molding manufacturing for portiforium type millipore plastics extrusions provided by the invention, this method is to be 40～1500 purpose preheating plastic powders after being positioned at feeding device on the double plunger formula extruder and entering heating cylinder with particle diameter, under the plunger extruding that fluid pressure drive device promotes, carried by continuous compacting and heating when making the surface temperature of plastic powders reach its melt temperature Tf ± 20 ℃, at once extrude from a head and a mouthful mould, subsequently, extrudate gets final product through cooling and shaping, draw-gear cooling and shaping.
The used plastic powders of the present invention comprises in thermoplastic resin low density polyethylene (LDPE), high density polyethylene (HDPE), full density polythene, metallocene PE, ultra-high molecular weight polyethylene, polyvinyl chloride, polypropylene, polytetrafluoroethylene (PTFE), Kynoar, polystyrene, polyamide, ABS, polyphenylene sulfide, polyether-ether-ketone, polyether ethersulfone, the polyarylsulfone (PAS) any.When its particle diameter during, can adopt some existing conventional technical methods such as mechanical lapping, supercritical fluid solution spraying granulation, liquid medium swelling, the pressing technology of in container, heating to handle and regulate particle diameter greater than 40 orders.
The feeding device that the present invention adopts can be blowing-type, vacuum intake formula and mandatory feeder; The cooling and shaping device can be selected any calibrator in multi-plate typing, the typing of typing cover, the typing of vacuum tank, floating core rod typing, the typing of sliding, roll extrusion typing and the natural wind cooling typing for use according to the section bar cross section geometric; Draw-gear can be crawler type, rubber traction formula, the roller type hauling machine that adapts with the section bar geometry; Above feeding device, cooling and shaping device and draw-gear all are present technique field equipment commonly used.
Can in the scope of broad, regulate the pore size and the distribution of gained section bar in order to make the inventive method, and percent opening, can also in the plastic powders of 100 parts of preheatings, sneak at least a in plasticizer, tackifier, blowing agent, the dispersant as required, when if used plastic powders is polyvinyl chloride, also must add heat stabilizer, wherein added plasticizer is 0～15 part, tackifier are 0～10 part, blowing agent is 0～6 part, dispersant is 0～5 part, heat stabilizer is 3～8 parts, and institute adds umber and is weight portion.
Processing step that the inventive method is concrete and condition are:
(1) plastic powders is heated up be preheated to 40～140 ℃ or, and intensification is preheated to 40～140 ℃ at least a the mixing in plastic powders and plasticizer, tackifier, blowing agent and the dispersant;
(2) plastic powders or the mixture of preheating are put into the constant temperature and humidity container, 40～140 ℃ of temperature, relative humidity 0.6～60% time stores 1～30 hour;
(3) plastic powders after will storing or mixture add in the heating cylinder of double plunger formula extruder and carry out extrusion molding, and wherein barrel temperature is 100～380 ℃, and head, die temperature are 130～380 ℃, and moulding pressure is 10～200MPa, and draw ratio is 1～3.
Can be for the plastic powders that hygroscopicity is stronger earlier 60～140 ℃ of temperature, under vacuum 0.02～0.08MPa, in convection oven, vacuum drying oven, fluidizing fluid-bed, dry warmer after dry 4～72 hours again with the preheatings that heat up such as plasticizer, tackifier, blowing agent and dispersant.
Used plasticizer is any in phthalic acid ester, aliphatic dicarboxylic acid ester, trimellitate, phosphate, epoxy-ester, alkyl sulfonic acid and ester thereof, the chlorinated paraffin wax in this method.
Used tackifier are any in the binder of polysulfones-chlorohydrocarbon solution, nylon-formic acid solution, ABS-tetrahydrofuran solution, phenolic aldehyde-benzene sulfonic acid solution, neoprene binder, polyacrylate binder, polyurethane adhesives, epoxy-poly-sulphur binder, butyronitrile-phenolic aldehyde and chloroethylene copolymer resin in this method.
Used blowing agent is any in azo-compound, nitroso compound, sulfonyl ester, the carbonate in this method.Wherein azo-compound is selected from Celogen Az, azodiisobutyronitrile, two azoaminobenzenes, diisopropyl azodiformate; Nitroso compound is selected from N ' N-dimethyl-N, N '-dinitrosoterephthalamine, N, N '-dinitroso five methine tetramines, N-nitrourea; Sulfonyl ester is selected from benzene sulfonyl hydrazide, unifor, three diazanyl s-triazine, biphenyl-4 ' 4-disulfonyl nitrine, right-(N-methoxy methyl acylamino-) benzene sulfonyl hydrazide; Carbonate is selected from ammonium carbonate, sodium acid carbonate and carbonic hydroammonium.
Used dispersant is at least a in alkane, aliphatic acid and ester thereof, fatty acid amide, the fatty acid metal soap of silicone oil, molecular weight＜20000 in this method.Wherein silicone oil is selected from dimethicone, ethyl silicon oil, methyl phenyl silicone oil; The alkane of molecular weight＜20000 is selected from white oil, naphthenic oil, microcrystalline wax, Tissuemat E, polypropylene wax, OPE, polytetrafluoroethylene (PTFE) wax; Aliphatic acid and ester thereof are selected from stearic acid, brown coal ester type waxes, glycerin monostearate; Fatty acid amide is selected from stearic amide, oleamide, erucamid erucyl amide, N, N '-methylene bis stearic amide and N, N '-ethylene bis stearic acid amide; The fatty acid metal soap is selected from calcium stearate, zinc stearate, aluminum stearate.
The heat stabilizer of used polyvinyl chloride is organotin such as di-n-butyltin dilaurate, Bis(lauroyloxy)dioctyltin, maleic acid dioctyltin, the different monooctyl ester dibutyl tin of two maleic acid, S in this method, S ' two (the different monooctyl ester of sulfo-Glycolic acid) dioctyltin, S, S '-two (the different monooctyl ester of sulfo-Glycolic acid) stannous methide, at least a in metallic soap composite liquid stabilizing agent such as liquid Ba complex stabilizer, the liquid calcium zinc complex stabilizer.
The present invention has the following advantages:
1; because the present invention is that 40～1500 purpose plastic powders are as raw material with average grain diameter; with extruding on the double plunger formula extruder; change that raw material will experience Solid Conveying and Melting in the existing extrusion; three of solid fusion and melt Conveying are extruded function phases; and raw material only experiences Solid Conveying and Melting in extrusion of the present invention; two of solid semi-molten are extruded function phases; thereby not only can simplify the moulding technological process; be convenient to controlling of production process; and can make processed trickle plastic powders be in the solid-liquid coexisting state; it is the semi-molten state; the raw material particle is only in crystal grain or the fusing of particulate interface; when crystal grain or particulate sandwich layer are then keeping the state of unfused solid phase particles; plastic powders can be bonded to as a whole goods mutually after extruding continuously; can also make in the goods to form countless open cell type micropores, solve to be difficult to prepare and expected the technical barrier of micropore plastic product of open-celled structure with conventional extrusion molding.
2, because the present invention not only can be by regulating the powder diameter size, also can be aided with and select suitable plasticizer, tackifier, dispersant and blowing agent to be mixed, with regulation and control corresponding heating-up temperature, pressure and heat time heating time, thereby can control percent opening, pore size and the distribution of goods easily.
3, because moulding heat time heating time of the inventive method is short, thereby plastic powders both had been not easy degraded in process, also can energy savings.
4, not only technology is simple for method provided by the invention, and is with short production cycle, and forming temperature is lower, and the time is also shorter, thereby can reduce production costs greatly.
5, method provided by the invention not only can be used for the moulding of the thermoplastic powder of easy fusion moulding, and can also be used to be difficult to the microporous article moulding of the plastic powders of melt molding, and is applied widely, is easy to apply.
Description of drawings
Fig. 1 is the SEM photo with the pure plastic powders board product of the inventive method acquisition;
Fig. 2 is with the plastic powders of the inventive method acquisition and the SEM photo of additive blends board product.
The specific embodiment
Provide embodiment below so that the present invention will be described in more detail; it is important to point out that following examples can not be interpreted as limiting the scope of the invention, the person skilled in the art in this field must belong to protection scope of the present invention according to the invention described above content to some nonessential improvement and the adjustment that the present invention did.
In addition, also what deserves to be explained is, below the used umber of each embodiment be weight portion.
Embodiment 1
With 40 order ABS (strange U.S. 757) powder, drying is 6 hours in the baking oven of 90 ℃ of temperature, vacuum 0.03MPa, take by weighing 100 parts then, and with the ABS-tetrahydrofuran solution of 2 part of 10% concentration, 3 parts of dibutyl sebacates and 3 parts of Celogen Azs (ADC), pour into together in the electrical heating high-speed mixer and mixed 5 minutes, heat up when being preheated to 80 ℃ discharging simultaneously; The mixture of preheating is put into dry warmer, 60 ℃ of temperature, relative humidity 15% time, 1 hour storage time; It is 175 ℃ vacuum intake formula feeding device that mixture after storing is put into temperature constant, with hydraulic drive type double plunger extruder, making raw material is the sheet material of 4mm by sheet material head, mouthful mould, the typing of vacuum tank, caterpillar tractor, cutting knife type cutter sweep extrusion molding thickness.Condition of molding: barrel temperature is 180～210 ℃, 210～235 ℃ of head, die temperatures, moulding pressure 20～40MPa, vacuum 0.07MPa, 70～90 ℃ of Vacuum shaping section temperature, draw ratio 1.5.The aperture of gained open cell type micropore sheet material is 1～50um, and voidage is 40 ± 5%.
Embodiment 2
With 100 part of 120 purpose polyvinyl chloride resin powder and 3 parts of di-n-butyltin dilaurates, 2 parts of epoxidized soybean oils, 3 parts of 20%PVC-dioctyl phthalate/oxolanes (=1: 6) solution, 4 parts of methyl phenyl silicone oils and 6 parts of benzene sulfonyl hydrazides (BSH), pour into together in the electrical heating high-speed mixer and mixed 8 minutes, heat up when being preheated to 60 ℃ discharging simultaneously; The mixture of preheating is put into dry warmer, 45 ℃ of temperature, relative humidity 50% time, 5 hours storage times; It is 120 ℃ blowing-type feeding device that mixture after storing is put into temperature constant, with Driven by Hydraulic Cylinder formula double plunger extruder, be that rectangle frame section bar mouth mould, multi-plate typing, caterpillar tractor, circular saw formula cutter sweep extrusion molding wall thickness are that 1.5mm, cross section are the section bar of rectangle frame by cross section.Condition of molding: barrel temperature is 145～155 ℃, 160～180 ℃ of head, die temperatures, moulding pressure 40～60MPa, 50～70 ℃ of typing section temperature, draw ratio 2.0.The aperture of the section bar of gained open cell type micropore rectangle frame is 0.1～10um, and voidage is 30 ± 5%.
Embodiment 3
With 100 part of 60 purpose ultra-high molecular weight polyethylene powder and 3 parts of naphthenic oils and 2 parts of ethyl silicon oils, pour into together in the electrical heating high-speed mixer and mixed 8 minutes, heat up when being preheated to 65 ℃ discharging simultaneously; The mixture of preheating is put into dry warmer, 65 ℃ of temperature, relative humidity 55% time, 10 hours storage times; It is 120 ℃ mandatory feeder apparatus that mixture after storing is put into temperature constant, with Driven by Hydraulic Cylinder formula double plunger extruder, be that circular ring type tubing mouth mould, the typing of typing cover, caterpillar tractor, circular saw formula cutter sweep extrusion molding wall thickness are that 2.0mm, internal diameter are the tubing of 10mm by cross section.Condition of molding: barrel temperature is 130～145 ℃, 145～180 ℃ of head, die temperatures, moulding pressure 100～150MPa, 70～90 ℃ of typing section temperature, draw ratio 1.5.The aperture of gained open cell type micropore tubing is 5～50um, and voidage is 20 ± 5%.
Embodiment 4
With 1500 order nylon, 6 powder, drying is 24 hours in the baking oven of 110 ℃ of temperature, vacuum 0.06MPa, takes by weighing 100 parts then, and with the nylon 6-formic acid solution of 8 part of 15% concentration, pour into together in the electrical heating high-speed mixer and mixed 15 minutes, heat up when being preheated to 95 ℃ discharging simultaneously; The mixture of preheating is put into dry warmer, 95 ℃ of temperature, relative humidity 0.6% time, 6 hours storage times; It is 180 ℃ of quantitative wind spraying aid type feeding devices that mixture after storing is put into temperature constant, with Driven by Hydraulic Cylinder formula double plunger extruder, be that slit-type sheet die, the typing of vacuum tank, caterpillar tractor, cutting knife type cutter sweep extrusion molding wall thickness are the 0.8mm sheet material by cross section.Condition of molding: barrel temperature is 200～210 ℃, 220～240 ℃ of head, die temperatures, moulding pressure 150～200MPa, vacuum 0.06MPa, 130～150 ℃ of typing section temperature, draw ratio 3.0.The aperture of gained open cell type microperforated sheet is 0.01～10um, and voidage is 30 ± 5%.
Embodiment 5
With 100 part of 200 purpose polypropylene powder and 2 parts of polypropylene waxes, 1 part of brown coal ester type waxes and 2 parts of carbonic hydroammonium, pour into together in the electrical heating high-speed mixer and mixed 2 minutes, heat up when being preheated to 50 ℃ discharging simultaneously; The mixture of preheating is put into dry warmer, 50 ℃ of temperature, relative humidity 60% time, 9 hours storage times; It is 120 ℃ quantitative wind spraying aid type feeding device that mixture after storing is put into temperature constant, with Driven by Hydraulic Cylinder formula double plunger extruder, be that circular ring type tubing mouth mould, the typing of vacuum tank, caterpillar tractor, circular saw formula cutter sweep extrusion molding wall thickness are that 5.0mm, internal diameter are the tubing of 30mm by cross section.Condition of molding: barrel temperature is 140～160 ℃, 165～185 ℃ of head, die temperatures, moulding pressure 100～150MPa, vacuum 0.07MPa, 70～90 ℃ of Vacuum shaping section temperature, draw ratio 1.5.The aperture of gained open cell type micropore tubing is 0.1～50um, and voidage is 30 ± 5%.
Embodiment 6
With 800 purpose pps powders, drying is 36 hours in the baking oven of 140 ℃ of temperature, vacuum 0.08MPa, take by weighing 100 parts then, and with 7 parts of epoxies-poly-sulphur adhesive and 2 part of three diazanyl s-triazine, pour into together in the electrical heating high-speed mixer and mixed 5 minutes, heat up when being preheated to 130 ℃ discharging simultaneously; The mixture of preheating is put into dry warmer, 130 ℃ of temperature, relative humidity 3% time, 25 hours storage times; It is 260 ℃ vacuum intake formula feeding device that mixture after storing is put into temperature constant, with Driven by Hydraulic Cylinder formula double plunger extruder, be that slit-type sheet die, roll extrusion typing, caterpillar tractor, circle sword grinding wheel type cutter sweep extrusion molding wall thickness are 2.0mm sheet material by cross section.Condition of molding: barrel temperature is 275～290 ℃, 290～330 ℃ of head, die temperatures, moulding pressure 150～200MPa, 100～250 ℃ of typing section temperature, draw ratio 1.0.The aperture of gained open cell type microperforated sheet is 0.01～10um, and voidage is 30 ± 5%.
Embodiment 7
With 100 part of 60 purpose polyvinyl chloride resin powder last and 5 parts of liquid calcium zinc complex stabilizers, 1.5 parts of two different monooctyl ester dibutyl tins of maleic acid, 6 parts of dioctyl phthalates and 6 parts of ammonium carbonates, pour into together in the electrical heating high-speed mixer and mixed 5 minutes, heat up when being preheated to 50 ℃ discharging simultaneously; The mixture of preheating is put into dry warmer, 40 ℃ of temperature, relative humidity 45% time, 8 hours storage times; It is 100 ℃ mandatory feeder apparatus that mixture after storing is put into temperature constant, with Driven by Hydraulic Cylinder formula double plunger extruder, be that circular ring type tubing mouth mould, slip typing, caterpillar tractor, circular saw formula cutter sweep extrusion molding wall thickness are that 6.0mm, internal diameter are the tubing of 60mm by cross section.Condition of molding: barrel temperature is 140～155 ℃, 160～180 ℃ of head, die temperatures, moulding pressure 100～150MPa, 50～70 ℃ of typing section temperature, draw ratio 1.5.The aperture of gained open cell type micropore tubing is 1～50um, and voidage is 20 ± 5%.
Embodiment 8
With 100 part of 120 purpose high-density polyethylene powder and 4 parts of Tissuemat Es, pour into together in the electrical heating high-speed mixer and mixed 8 minutes, heat up simultaneously when being preheated to 105 ℃, mixed 1 minute discharging again; The mixture of preheating is put into dry warmer, 65 ℃ of temperature, relative humidity 55% time, 10 hours storage times; It is 100 ℃ mandatory feeder apparatus that mixture after storing is put into temperature constant, with Driven by Hydraulic Cylinder formula double plunger extruder, be that circular ring type tubing mouth mould, the typing of typing cover, rubber traction formula hauling machine, cutting knife type cutter sweep extrusion molding wall thickness are that 0.5mm, internal diameter are the tubing of 2mm by cross section.Condition of molding: barrel temperature is 120～130 ℃, 130～170 ℃ of head, die temperatures, moulding pressure 60～100MPa, 50～70 ℃ of typing section temperature, draw ratio 2.5.The aperture of gained open cell type micropore tubing is 1～50um, and voidage is 15 ± 5%.
Embodiment 9
With 100 part of 1300 purpose polypropylene powder and 5 parts of polypropylene waxes, pour into together in the electrical heating high-speed mixer and mixed 8 minutes, heat up simultaneously when being preheated to 110 ℃, mixed 1 minute discharging again; The mixture of preheating is put into dry warmer, 65 ℃ of temperature, relative humidity 55% time, 10 hours storage times; It is 120 ℃ blowing-type feeder apparatus that mixture after storing is put into temperature constant, with Driven by Hydraulic Cylinder formula double plunger extruder, be that slit-type sheet die, Vacuum shaping, caterpillar tractor, circle sword grinding wheel type cutter sweep extrusion molding wall thickness are 10.0mm sheet material by cross section.Condition of molding: barrel temperature is 150～165 ℃, 165～185 ℃ of head, die temperatures, moulding pressure 150～200MPa, 60～100 ℃ of typing section temperature, draw ratio 1.0.The aperture of gained open cell type microperforated sheet is 0.01～10um, and voidage is 40 ± 5%.
Embodiment 10
With 80 height of eye density polyethylene powder, put into temperature constant and be 100 ℃ air blast feeder, with Driven by Hydraulic Cylinder formula double plunger extruder, be that slit-type sheet die, the typing of typing cover, rubber traction formula hauling machine, circular saw formula cutter sweep extrusion molding thickness are the sheet material of 0.5mm by cross section.Condition of molding: barrel temperature is 120～130 ℃, 140～180 ℃ of head, die temperatures, moulding pressure 50～80MPa, 50～70 ℃ of typing section temperature, draw ratio 2.5.The aperture of gained open cell type micropore tubing is 1～50um, and voidage is 20 ± 5%.
Claims (9)
1. the method for a semi-vitreous extrusion molding manufacturing for portiforium type millipore plastics extrusions, this method is to be 40～1500 purpose preheating plastic powders after being positioned at feeding device on the double plunger formula extruder and entering heating cylinder with particle diameter, under the plunger extruding that fluid pressure drive device promotes, carried by continuous compacting and heating when making the surface temperature of plastic powders reach its melt temperature Tf ± 20 ℃, at once extrude from a head and a mouthful mould, subsequently, extrudate gets final product through cooling and shaping, draw-gear cooling and shaping.
2. the method for semi-vitreous extrusion molding manufacturing for portiforium type millipore plastics extrusions according to claim 1, this method also is mixed with at least a in plasticizer, tackifier, blowing agent, the dispersant in the plastic powders of 100 parts of preheatings, wherein plasticizer is 0～15 part, tackifier are 0～10 part, blowing agent is 0～6 part, dispersant is 0～5 part, and institute adds umber and is weight portion.
3. the method for semi-vitreous extrusion molding manufacturing for portiforium type millipore plastics extrusions according to claim 1 and 2, the processing step of this method and condition are:
(1) plastic powders is heated up be preheated to 40～140 ℃ or, and intensification is preheated to 40～140 ℃ at least a the mixing in plastic powders and plasticizer, tackifier, blowing agent and the dispersant;
(2) plastic powders or the mixture of preheating are put into the constant temperature and humidity container, 40～140 ℃ of temperature, relative humidity 0.6～60% time stores 1～30 hour;
(3) plastic powders after will storing or its mixture add in the heating cylinder of double plunger formula extruder and carry out extrusion molding, wherein barrel temperature is 100～380 ℃, head, die temperature are 130～380 ℃, and moulding pressure is 10～200MPa, and draw ratio is 1～3.
4. the method for semi-vitreous extrusion molding manufacturing for portiforium type millipore plastics extrusions according to claim 3, used plasticizer is any in phthalic acid ester, aliphatic dicarboxylic acid ester, trimellitate, phosphate, epoxy-ester, alkyl sulfonic acid and ester thereof, the chlorinated paraffin wax in this method.
5. the method for semi-vitreous extrusion molding manufacturing for portiforium type millipore plastics extrusions according to claim 3, used tackifier are any in the binder of polysulfones-chlorohydrocarbon solution, nylon-formic acid solution, ABS-tetrahydrofuran solution, phenolic aldehyde-benzene sulfonic acid solution, neoprene binder, polyacrylate binder, polyurethane adhesives, epoxy-poly-sulphur binder, butyronitrile-phenolic aldehyde and chloroethylene copolymer resin in this method.
6. the method for semi-vitreous extrusion molding manufacturing for portiforium type millipore plastics extrusions according to claim 3, used blowing agent is any in azo-compound, nitroso compound, sulfonyl ester, the carbonate in this method.
7. the method for semi-vitreous extrusion molding manufacturing for portiforium type millipore plastics extrusions according to claim 6, used azo-compound is selected from Celogen Az, azodiisobutyronitrile, two azoaminobenzenes, diisopropyl azodiformate in this method; Nitroso compound is selected from N ' N-dimethyl-N, N '-dinitrosoterephthalamine, N, N '-dinitroso five methine tetramines, N-nitrourea; Sulfonyl ester is selected from benzene sulfonyl hydrazide, unifor, three diazanyl s-triazine, biphenyl-4 ' 4-disulfonyl nitrine, right-(N-methoxy methyl acylamino-) benzene sulfonyl hydrazide; Carbonate is selected from ammonium carbonate, sodium acid carbonate and carbonic hydroammonium.
8. the method for semi-vitreous extrusion molding manufacturing for portiforium type millipore plastics extrusions according to claim 3, used dispersant is at least a in alkane, aliphatic acid and ester thereof, fatty acid amide, the fatty acid metal soap of silicone oil, molecular weight＜20000 in this method.
9. the method for semi-vitreous extrusion molding manufacturing for portiforium type millipore plastics extrusions according to claim 8, used silicone oil is selected from dimethicone, ethyl silicon oil, methyl phenyl silicone oil in this method; The alkane of molecular weight＜20000 is selected from white oil, naphthenic oil, microcrystalline wax, Tissuemat E, polypropylene wax, OPE, polytetrafluoroethylene (PTFE) wax; Aliphatic acid and ester thereof are selected from stearic acid, brown coal ester type waxes, glycerin monostearate; Fatty acid amide is selected from stearic amide, oleamide, erucamid erucyl amide, N, N '-methylene bis stearic amide and N, N '-ethylene bis stearic acid amide; The fatty acid metal soap is selected from calcium stearate, zinc stearate, aluminum stearate.
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