CN102218806A - Method for preparing micropore polyethylene structure and its preparation device - Google Patents
Method for preparing micropore polyethylene structure and its preparation device Download PDFInfo
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- CN102218806A CN102218806A CN2011100773044A CN201110077304A CN102218806A CN 102218806 A CN102218806 A CN 102218806A CN 2011100773044 A CN2011100773044 A CN 2011100773044A CN 201110077304 A CN201110077304 A CN 201110077304A CN 102218806 A CN102218806 A CN 102218806A
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- screw extruder
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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
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
- B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
Abstract
The invention discloses a method for preparing a micropore polyethylene structure and its preparation device, which is characterized in that polyethylene and a porous mineral material are used for mixing in a double screw extruder, then placed into a formed die for forming, wherein the processing temperature range of the double screw extruder is from 160 DEG C to 230 DEG C, the rotating speed of a screw is from 150 RPM to 350 RPM, the length diameter ratio of the double screw extruder is 40: 1 - 52: 1, the melt flow index of the polyethylene is from 0.04dg/10minutes to 20dg/10 minutes, the porous mineral is one of diatomite, zeolite, meerschaum or pumice. The invention also discloses a device for preparing the micropore polyethylene structure. According to the method provided in the invention, no physical or chemical blowing agent is used in the method which has the merits of environmental protection, energy saving and consumption reduction and can substantially reduce manufacture cost; the device has the advantages of simple structure and convenient operation.
Description
Technical field
The present invention relates to prepare the method and the preparation facilities technical field thereof of microporous polyethylene structure.
Background technology
Cellular plastic is the foamed plastics with the fine abscess of high density.Cellular plastic is owing to have thinner and uniform abscess, and proportion is little, in light weight, has excellent energy absorption and mechanical strength, and other specific function of optical property and some especially.The density from 0.90 to 0.97 of general vinyon hollow container.Foaming can reduce the weight of material usage and product, reduces packing and cost of transportation, reduces the pollution to environment.Cellular plastic is generally made on the extruder of extruder screw that has special construction and die head with physical blowing agent and CBA.Microcellular structure also can increase the nontransparent degree of material, thereby reduces or obtain desirable covering power without the titanium dioxide of cost costliness.
Physical blowing is meant that the formation of abscess is the variation by a certain material physical aspect, such as the dissolving of the volatilization of the expansion of Compressed Gas, liquid or solid and form.Physical blowing agent commonly used has lower boiling alkane and fluorocarbons, such as pentane, n-hexane, normal butane, normal heptane, benzinum (naphtha), Arcton 11 (freon-11), dicholorodifluoromethane (Freon 12), dichlorotetra-fluoroethane (Chlorfluoranum), supercritical carbon dioxide and overcritical nitrogen etc.
CBA is meant that heating or the condition of shearing issue the reaction of separating estranged, emits gas, mainly is nitrogen or carbon dioxide, forms the compound of pore in polymeric matrix.CBA generally is divided into organic chemistry blowing agent and inorganic chemistry blowing agent two big classes.Organic chemistry blowing agent commonly used mainly contains azo-compound, sulfonyl hydrazines compound, nitroso compound etc.The inorganic chemistry blowing agent mainly contains carbonate, bicarbonate etc.
Existing these prepare the method for cellular plastic, wastage of material is big, no matter have environmental pollution, be physical blowing, still adopts CBA, in preparation process, this program of foaming must be arranged, thereby make that requirement is comparatively complicated aspect equipment, comparatively trouble operates, can not save energy and reduce the cost, manufacturing cost increases greatly.
Summary of the invention
The purpose of this invention is to provide a kind of method for preparing the microporous polyethylene structure, do not use physics or CBA, environmental protection, energy-saving and cost-reducing, reduce manufacturing cost greatly.
Further purpose is that its preparation facilities is simple in structure, and is easy to operate.
Purpose of the present invention is achieved through the following technical solutions.
A kind of method for preparing the microporous polyethylene structure, it is characterized in that with polyethylene and porous mineral upright be connected in the double screw extruder mixing, enter the molding die moulding then and form, the processing temperature of double screw extruder is at 160 ℃～230 ℃, screw speed 150RPM～350RPM, the draw ratio of double screw extruder 40: 1～52: 1, poly melt flow index is 0.04dg/10min～20dg/10min, and porous mineral matter is diatomite, or zeolite, or sepiolite, or float stone.
Described polyethylene is a high density polyethylene, or LLDPE LLDPE, or low density polyethylene.
Described its particle diameter of porous mineral matter is below 20 microns.
Described zeolite comprises natural zeolite or artificial synthetic zeolite.
Described microporous polyethylene structure is single layer structure or plural layer structure, and its sandwich layer is the microporous polyethylene structure sheaf during for the plural layer structure, and skin is polypropylene layer or polyethylene layer.
Described poly melt flow index is 0.20dg/10min～2dg/10min, and the draw ratio of double screw extruder is 44: 1～48: 1, and the processing temperature of double screw extruder is 180 ℃～200 ℃, and screw speed is 250RPM～280RPM.
Also be added with auxiliary agent antioxidant or auxiliary agent uvioresistant photo etching in the described double screw extruder.
The mass fraction proportioning of described polyethylene, porous mineral matter and auxiliary agent is 35～90: 10～65: 0.05～1.0.
Mass fraction proportioning the best of described polyethylene, porous mineral matter and auxiliary agent is 50～65: 35～50: 0.1～0.3.
A kind of device for preparing the microporous polyethylene structure, it is characterized in that: the device of described preparation microporous polyethylene structure comprises porous mineral matter feeder, the polyvinyl resin feeder, auxiliary agent feeder and double screw extruder, porous mineral matter feeder, the polyvinyl resin feeder, the auxiliary agent feeder all is connected with double screw extruder, double screw extruder passes through conveyance conduit, one transition head is connected with molding die, be provided with exhaust outlet on the conveyance conduit at double screw extruder between the logical and transition head, described molding die is a tubing, the molding die of section bar or hollow container.
The present invention compared with prior art has the following advantages:
The method for preparing the microporous polyethylene structure by the present invention as can be known, only by in polyethylene, adding porous matter mineral filler such as diatomite, zeolite and float stone etc., directly entering molding die after mixing through double screw extruder again, just can to prepare the hollow structure with micropore be the microporous polyethylene structure, can be tubing, section bar and hollow container.Wherein:
Diatomite is the deposition salt that ancient times diatom remains fossil is formed, and its main chemical is a silica, also has a small amount of Al in addition
2O
3, CaO, MgO etc.It is light yellow or light grey that diatomite is usually, the soft porous of matter and light.Diatomaceous porosity is up to 90～92%, so absorbability is strong.Chemical property is stable, wear-resisting, heat-resisting.Industrially be commonly used to do insulation material, filtering material, filler, grinding-material, waterglass raw material, decolorizer etc.Proportion general 0.4～0.9.
Zeolite is the general name of zeolite family mineral, is a kind of moisture alkali metal or the manosil AS mineral of alkaline-earth metal.The zeolite that nature is found has kind more than 30, synthesizes into multiple structure but also can manually design now.Zeolite group mineral is divided into four kinds of frame shape, sheet, fibrous and powdery type by feature.Be divided into one dimension, two dimension, three-dimensional system by pore canal system.More common natural zeolite has analcime, chabasie, scolecite, heulandite, sodalite, modenite, foresite etc., all contains sodium based on calcic.Pure various zeolites are colourless or white, but can be light color, glassy lustre because of sneaking into various impurity.Mohs' hardness is medium, proportion is between 2.0～2.3, baric then can reach 2.5 or 2.8.The crystal structure of zeolite is the screen work of the three-dimensional that is linked to be by sial oxygen tetrahedron, and the hole and the passage that differ in size are arranged in the screen work, has very big opening.Can draw or filter the molecule of other materials that vary in size.Industrial often with it as molecular sieve, to purify or to separate the material that mixes composition.Purify, handle industrial pollution or the like as gas separation, oil, also can be used in metal particles such as reclaiming copper, lead, cadmium, nickel, molybdenum in the industrial wastes.
Sepiolite is a kind of fibrous hydrous magnesium silicate, is white, light gray, color such as pale yellow usually, and is opaque also lackluster.Its morphosis is to be got together by countless filaments to line up sheet.Sepiolite belongs to orthorhombic system or monocline prismatic crystal system.Mohs' hardness is between 2～2.5; Physique is light, and density is 1～2.2 gram/cubic centimetre.Sepiolite has extremely strong absorption, decolouring and dispersive property, also has high heat endurance.
Float stone claims pumice or foam again, is the acid volcano of the nature of glass effusive rock of a kind of porous, lightweight.Its gas orifice collection accounts for more than 50% of rock volume.The voidage of natural pumice is 71.8～81%, and water absorption rate is 50～60%.Its feature is light weight, intensity height, acid and alkali-resistance, corrosion-resistant and pollution-free.In prescription, also add function additive such as antioxidant and uvioresistant photo etching etc. according to processing and application demand, guaranteeing that polyvinyl resin do not degrade or partial cross-linking because of heat, light and shearing produce in processing and use, thereby influence the relevant performance of mechanical strength of this structure with other.
From the above, in polyethylene, add porous matter mineral filler and after double screw extruder is mixing, directly enter molding die together and just can prepare the microporous polyethylene structure, thus without any need for physics or CBA, so environmental protection, energy-saving and cost-reducing, greatly reduce manufacturing cost.Adopt method of the present invention, the attribute that itself has and the polyethylene that have made full use of porous matter mineral are directly mixing to reach the molten condition of synthetic novel substance at double screw extruder, prepare the material of microporous polyethylene structure then by molding die, so method of the present invention is a kind of environmental protection, energy-saving and cost-reducing preparation method.
By constituting as can be known of the device for preparing the microporous polyethylene structure, it is simple in structure, and corresponding operation is also simple, makes the product cost for preparing reduce greatly.
Description of drawings
Fig. 1 is the device schematic diagram that the present invention prepares the microporous polyethylene structure.
The specific embodiment
The present invention prepares the method for microporous polyethylene structure: with polyethylene and porous mineral upright be connected in the double screw extruder mixing, entering the molding die moulding then forms, the processing temperature of double screw extruder is at 160 ℃～230 ℃, screw speed 150RPM～350RPM, the draw ratio of double screw extruder 40: 1～52: 1, poly melt flow index is 0.04dg/10min～20dg/10min, porous mineral matter is diatomite, or zeolite, or sepiolite, or float stone.Wherein mixing be exactly with plastic resin and additive, filling mineral in twin-screw or single-screw machine at a certain temperature in the continuously extruded technology that mixes down between the screw element or between screw element and the barrel wall.Polyethylene is a high density polyethylene, or LLDPE LLDPE, or low density polyethylene.Its particle diameter of porous mineral matter requires below 20 microns.Zeolite can be natural zeolite or artificial synthetic zeolite.Melt flow index the best wherein is 0.20dg/10min～2dg/10min, and draw ratio the best of double screw extruder is 44: 1～48: 1, and processing temperature the best of double screw extruder is 180 ℃～200 ℃, and screw speed the best is 250RPM～280RPM.Also be added with auxiliary agent antioxidant or uvioresistant photo etching in the double screw extruder, wherein the mass fraction proportioning of polyethylene, porous mineral matter and auxiliary agent is 35～90: 10～65: 0.05～1.0, and the mass fraction proportioning of best polyethylene, porous mineral matter and auxiliary agent is 50～65: 35～50: 0.1～0.3.The microporous polyethylene structure of being prepared by the present invention is single layer structure or plural layer structure, if its sandwich layer is the microporous polyethylene structure sheaf during plural layer structure, skin is polypropylene layer or polyethylene layer.
Following mask body is described as follows the concrete mass fraction proportioning of polyethylene, porous mineral matter and auxiliary agent:
Embodiment 1: 100 parts of HDPE resins, 30 parts in diatomite and antioxidant AT2250.1 part are mixed in the adding double screw extruder, and screw speed is 260RPM, and the processing extrusion temperature is 190C, extrudes pipe by die head.Record 56 microns of abscess average diameters.Wherein HDPE 5502, density 0.955g/cm3, and melt flow index 0.35g/10min is Maoming branch company of China Petrochemical Industry product; Diatomite, Celite Infilm 300,12 microns of average grain diameters are dispatched from the factory in the white Celite of length Co., Ltd; Antioxidant AT225, the Jin Haiyabao chemical industry has existing company; Double screw extruder OP-75, Guangzhou Hua Xinke machinery Co., Ltd.
Embodiment 2: 100 parts of HDPE resins, 30 parts in zeolite and antioxidant AT2250.1 part are mixed in the adding double screw extruder, and screw speed is 260RPM, and the processing extrusion temperature is 190C, extrudes pipe by die head.Record 17 microns of abscess average diameters.Wherein HDPE 5502, density 0.955g/cm3, Maoming branch company of melt flow index 0.35g/10min China Petrochemical Industry; The 4A zeolite, 2 microns of average grain diameters, Shanxi long day Li Gaoke Co., Ltd; Antioxidant AT225, the Jin Haiyabao chemical industry has existing company; Double screw extruder OP-75, Guangzhou Hua Xinke machinery Co., Ltd.
Embodiment 3: 100 parts of HDPE resins, 40 parts in diatomite and antioxidant AT2250.1 part are mixed in the adding double screw extruder, and the processing extrusion temperature is 190C, extrudes pipe by die head.Record 39 microns of abscess average diameters.Wherein HDPE 5502, density 0.955g/cm3, Maoming branch company of melt flow index 0.35g/10min China Petrochemical Industry; Diatomite, Celite Infilm300,12 microns of average grain diameters, the white Celite of length Co., Ltd; Antioxidant AT225, the Jin Haiyabao chemical industry has existing company; Double screw extruder 0P-75, Guangzhou Hua Xinke machinery Co., Ltd.
Embodiment 4: 100 parts of HDPE resins, 10 parts in diatomite and antioxidant AT225 are mixed in the adding double screw extruder for 0.1 part, and the processing extrusion temperature is 190C, extrudes the pipe base by die head.Record 82 microns of abscess average diameters.Wherein HDPE 5502, density 0.955g/cm3, Maoming branch company of melt flow index 0.35g/10min China Petrochemical Industry; Diatomite, Celite Infilm300,12 microns of average grain diameters, the white Celite of length Co., Ltd; Antioxidant AT225, the Jin Haiyabao chemical industry has existing company; Double screw extruder OP-75, Guangzhou Hua Xinke machinery Co., Ltd.
Embodiment 5: 100 parts of HDPE resins, 30 parts in diatomite and antioxidant AT225 are mixed in the adding double screw extruder for 0.1 part, screw speed is respectively 100RPM, 130RPM, 260RPM and 500RPM, the processing extrusion temperature is 190C, extrudes the pipe base by die head.Record the abscess average diameter and be respectively 93 microns, 82 microns, 56 microns and 118 microns.Wherein HDPE 5502, density 0.955g/cm3, Maoming branch company of melt flow index 0.35g/10min China Petrochemical Industry; Diatomite, Celite Infilm 300,12 microns of average grain diameters, the white Celite of length Co., Ltd; Antioxidant AT225, the Jin Haiyabao chemical industry has existing company; Double screw extruder OP-75, Guangzhou Hua Xinke machinery Co., Ltd.
Embodiment 6: 100 parts of HDPE 8916 resins, 30 parts in diatomite and antioxidant AT2250.1 part are mixed in the adding double screw extruder, and screw speed is 260RPM, and the processing extrusion temperature is 190C, extrudes pipe by die head.Record 223 microns of abscess average diameters.As HDPE 8916, density 0.951g/cm3, Maoming branch company of melt flow index 16g/10min China Petrochemical Industry; Diatomite, Celite Infilm 300,12 microns of average grain diameters, the white Celite of length Co., Ltd; Antioxidant AT225, the Jin Haiyabao chemical industry has existing company; Double screw extruder OP-75, Guangzhou Hua Xinke machinery Co., Ltd.
As shown in Figure 1, the device of the microporous polyethylene structure of preparing comprises porous mineral matter feeder 1, polyvinyl resin feeder 2, auxiliary agent feeder 3 and double screw extruder 4, pedestal 9, porous mineral matter feeder 1, polyvinyl resin feeder 2, auxiliary agent feeder 3 all are connected with double screw extruder 4, double screw extruder 4 is connected with molding die 6 by a transition head 5, conveyance conduit 8, be provided with exhaust outlet 7 between double screw extruder 4 and transition head 5, wherein molding die 6 is the molding die of tubing, section bar or hollow container.Molding die 6 sides still have some peripheral equipments.
Claims (10)
1. method for preparing the microporous polyethylene structure, it is characterized in that with polyethylene and porous mineral upright be connected in the double screw extruder mixing, enter the molding die moulding then and form, the processing temperature of double screw extruder is at 160 ℃～230 ℃, screw speed 150RPM～350RPM, the draw ratio of double screw extruder 40: 1～52: 1, poly melt flow index is 0.04dg/10min～20dg/10min, and porous mineral matter is diatomite, or zeolite, or sepiolite, or float stone.
2. the method for preparing the microporous polyethylene structure according to claim 1 is characterized in that: described polyethylene is a high density polyethylene, or LLDPE LLDPE, or low density polyethylene.
3. the method for preparing the microporous polyethylene structure according to claim 2 is characterized in that: described its particle diameter of porous mineral matter is below 20 microns.
4. the method for preparing the microporous polyethylene structure according to claim 2 is characterized in that: described zeolite comprises natural zeolite or artificial synthetic zeolite.
5. the method for preparing the microporous polyethylene structure according to claim 2, it is characterized in that: described microporous polyethylene structure is single layer structure or plural layer structure, its sandwich layer is the microporous polyethylene structure sheaf during for the plural layer structure, and skin is polypropylene layer or polyethylene layer.
6. the method for preparing the microporous polyethylene structure according to claim 2, it is characterized in that: described melt flow index is 0.20dg/10min～2dg/10min, the draw ratio of double screw extruder is 44: 1～48: 1, the processing temperature of double screw extruder is 180 ℃～200 ℃, and screw speed is 250RPM～280RPM.
7. the method for preparing the microporous polyethylene structure according to claim 2 is characterized in that: also be added with auxiliary agent antioxidant or auxiliary agent uvioresistant photo etching in the described double screw extruder.
8. the method for preparing the microporous polyethylene structure according to claim 7 is characterized in that: the mass fraction proportioning of described polyethylene, porous mineral matter and auxiliary agent is 35～90: 10～65: 0.05～1.0.
9. the method for preparing the microporous polyethylene structure according to claim 7 is characterized in that: the mass fraction proportioning of described polyethylene, porous mineral matter and auxiliary agent is 50～65: 35～50: 0.1～0.3.
10. device for preparing the microporous polyethylene structure, it is characterized in that: the device of described preparation microporous polyethylene structure comprises porous mineral matter feeder, the polyvinyl resin feeder, auxiliary agent feeder and double screw extruder, porous mineral matter feeder, the polyvinyl resin feeder, the auxiliary agent feeder all is connected with double screw extruder, double screw extruder passes through conveyance conduit, one transition head is connected with molding die, be provided with exhaust outlet on the conveyance conduit at double screw extruder between the logical and transition head, described molding die is a tubing, the molding die of section bar or hollow container.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103448228A (en) * | 2013-08-16 | 2013-12-18 | 苏州凯虹高分子科技有限公司 | Technology for preparing micropore pipe through semi-molten continuous extrusion of high molecular powder |
| US10661524B2 (en) | 2016-03-11 | 2020-05-26 | Halcor S.A. | Crosslinked tubular foam |
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| CN103448228A (en) * | 2013-08-16 | 2013-12-18 | 苏州凯虹高分子科技有限公司 | Technology for preparing micropore pipe through semi-molten continuous extrusion of high molecular powder |
| CN103448228B (en) * | 2013-08-16 | 2015-09-30 | 苏州凯虹高分子科技有限公司 | The technique of the continuously extruded preparation microporous pipe of a kind of polymeric powder semi-molten |
| US10661524B2 (en) | 2016-03-11 | 2020-05-26 | Halcor S.A. | Crosslinked tubular foam |
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