CN101402011B - Cellular plastic filter element and method of producing the same - Google Patents
Cellular plastic filter element and method of producing the same Download PDFInfo
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- CN101402011B CN101402011B CN200810120988XA CN200810120988A CN101402011B CN 101402011 B CN101402011 B CN 101402011B CN 200810120988X A CN200810120988X A CN 200810120988XA CN 200810120988 A CN200810120988 A CN 200810120988A CN 101402011 B CN101402011 B CN 101402011B
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Abstract
The invention relates to a filter element, which is formed by pressing polyethylene power or polypropylene power or a mixture of the polyethylene power and the polypropylene power. In the aspect of structure, the pore diameter of filtration pores undergoes gradient change along the filtration direction from less than 500 micrometers to more than 0.5 micrometer. The method for manufacturing the filter element comprises the following technological steps: i. water and water vapor are added into raw materials for stirring at high rotating speed; ii. the materials after stirring are added into a die for uniform heating, so as to reach the constant temperature, and the constant temperature of each die of products with the same specification is guaranteed to be consistent; iii. anisothermal heating compression molding forming is performed on the die respectively on the upstream and the downstream of the filter element; and iv. controlled cooling of different degrees is performed on the die respectively on the upstream and the downstream of the filter element. The method only uses the physical method to solve the technical problems which can not be solved by combination of the chemical method. Compared with the prior art, the mipor plastic filter element and the manufacturing method thereof provided by the invention provide the filter element which is difficult to block and convenient to regenerate; and the manufacturing process is simple and safe, and has no environment pollution.
Description
What technical field the present invention relates to is a kind of cellular plastic filter element and preparation method thereof, belongs to the technical field that plastic product is made, and also belongs to the technical field that Filters is made.
What the technical background cellular plastic filter element comprised sheet, tubulose or other shape is the filter element of base material with plastics.
Polyethylene (PE), polypropylene (PP) are a kind of application general engineering plastic very widely, have characteristics such as chemical resistance, hear resistance, nontoxic, tasteless, comprehensive mechanical property and excellent processability, cost be low.The cellular plastic filter element that adopts polypropylene, polythene material to make can be used as the filter element in the fields such as chemical industry purification, clean water treatment, air filtration, medicine equipment and lead-acid accumulator filter acid, the interrelationship between industries height, and market application foreground is big.
At present, the preparation method of cellular plastic filter element mainly contains phase separation method, gas supersaturation method, the anti-solvent precipitation of compressed fluid and monomer polymerization reactions method.
Phase separation method is that utilization is separated and solvent freezes the unidirectional cooling or the strict solution degassing in the process of analysing, and produces even foam in plastic products.Concrete technology is first dissolve polymer, then solution is put into mould, and the quenching mould freezes up to solution analyses.From the polymer solvent phasor, can select liquid liquid or liquid-solid phase to separate, it is isotropism that solvent freezes the living foam of division, abscess is less.
The technical process of gas supersaturation method is at first to use inert gas (as N
2, CO
2) at high pressure and the following saturated polymer of vitrification point; Utilize the thermodynamic phase that polymer temperature raises and pressure reduces to produce to generate abscess then, this instantaneous unstability induces countless abscess nucleation, and it is very even to distribute; Relief abscess rises to required size and can obtain the micron order foam.
The anti-solvent precipitation of compressed fluid is with supersaturation CO
2Supersaturated vapor above the liquid is anti-solvent, polymer solution is sprayed by capillary enter liquid CO
2Among, making its drying and vitrifying, diffusion produces system rapidly with strong atomizing and is separated the formation submicron at a high speed.
The monomer polymerization reactions method is to utilize the thermodynamic stability of microemulsion and orderly micro-structural, polymerization single polymerization monomer is dispersed in carries out polymerization in the microemulsion, obtains micron order foam solid material.
In above-mentioned four kinds of forming principles, use wider with second class.In more than ten years in the past, a large amount of research concentrates on the second class technology, and has successfully implemented several industrialized preparing process: batch process, improvement hot-forming method, continuous extrusion molding and injection moulding.
There are three big defectives in cellular plastic filter element with method for preparing: 1, complex process, long flow path, cost height.2, the porosity of micropore all is uniform everywhere in the resulting cellular plastic filter element, therefore just cause it in filter process, to result in blockage easily, and be not easy to be dredged cleaning, promptly the regenerability of filter element a little less than.3, various additives and the auxiliary agent that will introduce in the process of making microporous filter element, this makes carries secretly in the product or more residual chemical substance with toxic, thereby has reduced the applicability of product.Therefore, the cellular plastic filter element that need seek a kind of novel controlled architecture solves the problem that is run in the production use.
Summary of the invention is at the technological deficiency of above-mentioned existence, and the present invention will propose a kind of filter opening aperture along cellular plastic filter element of showing off graded on the filtering direction and preparation method thereof.
Cellular plastic filter element provided by the invention, be that the micropore that plastic mould pressing system forms has the section bar material, the material that is adopted is the mixture of polyethylene powder or polypropylene powder or polyethylene powder and polypropylene powder, structurally the filter opening aperture along on the filtering direction from more than 0.5 μ m, changing in gradient below the 500 μ m.
Cellular plastic filter element provided by the invention is compared with existing cellular plastic element, employing has the micropore size of graded, when filtering, be filtered fluid earlier by the gross porosity district,, the elimination thing be blocked at the diverse location of filter element again by the pore district, improved filter efficiency, be not easy filter element is blocked up in fact, also be easy to regenerate, prolonged service life with recoil technology.
The manufacture method of cellular plastic filter element provided by the invention, its technical process is:
I. mix agitating procedure, the plastics powder added mixer in mixing agitating procedure and add water and steam and stir with the rotating speed more than the 5000r/min, the temperature of mixing plastics powder in the agitating procedure is controlled at 40～60 ℃:
Ii. preheating procedure, to add subsequently through the plastics powder that stirs and evenly heat in the mould and reach mould and plastics powder constant temperature wherein, and guarantee every mould thermostat temperature unanimity of same specification product, heating-up temperature should be lower than the temperature that water evaporates in mould, thermostat temperature is controlled at 60 ℃～80 ℃ in the preheating procedure;
Iii. compression molding operation, filtering direction according to filter element after the moulding, in the upstream and downstream of filter element mould is carried out not isothermal heating respectively, upstream temperature is lower than downstream temperature, degree of heat is melted in the temperature range of whole thawings making plastics begin the part, and the heating-up temperature scope is 130～180 ℃ in the compression molding operation;
Iv. refrigerating work procedure, refrigerating work procedure carries out in mould, in the filter element upstream and downstream mould is carried out in various degree controlled cooling respectively according to the designing requirement of product.
The plastics powder that adds mould in the said preheating procedure has low boiling solution film package status after having kept stirring end, and preferably stirring is put into mould after finishing in a short time.For the filter element of same specification requirement, to guarantee that when preheating all moulds all obtain identical pre-thermal result in addition, so that guarantee final resulting product specification unanimity.
Said controlled cooling is meant that acting on two parts of mould under the condition that temperature and the flow velocity at cooling agent be controlled is controlled cooling velocity, two parts of control mould at one time in or be cooled to different temperatures or same temperature in the different time.
Above-mentioned mixing time, preheating constant temperature time, press time, cool time are all with what of quantity of material, the size of filter element, the filter element thickness is relevant, the grasp of time is as the criterion to reach the technology purpose, makes as stirring that the degree height, preheating constant temperature degree height of plastic grain outer wrapping low boiling solution, compacting heating-up temperature are goed deep into non-blind area, chilling temperature gos deep into non-blind area etc.
The forming principle of cellular plastic filter element provided by the invention: polyethylene, polypropylene or their mixture powder are mixed stirring in homogenizer, add entry, water vapour simultaneously, make the particle surface of plastics powder moistening, i.e. particle surface parcel layer of even low boiling solution film; Then, the plastics powder that stirs inserted heat compression moulding in the mould, in heating process, the low boiling solution film explosive evaporation of plastics powder particle surface parcel, generating bubble makes the moment that filter element melts bonding on the plastic grain surface produce micropore, by the particle diameter of regulating plastic grain, the consumption of low boiling solution, can effectively control the scope in cellular plastic element aperture.All will produce many and thin steam particle because evaporation at a high speed, then heating-up temperature is high more generates less filter opening with condensation temperature is low more, and heating-up temperature is low more and condensation temperature is high more just can produce bigger micropore size.Therefore can conduct heat to the not temperature of ipsilateral of mould by accurate adjusting, utilize micropore size that the difference of mould different metal thermal conductivity factor can make cellular plastic filter element along changing in gradient on the filtering direction.
Cellular plastic filter element provided by the invention and manufacture method thereof adopt nonhazardous, free of contamination raw material, adopt economical and efficient, exercisable technology, and prepare a kind of on filtering direction the filter opening aperture only just solved numerous unsolved technical problems of chemical method that combine by the cellular plastic filter element of graded with physical method.The key of its usefulness is exactly the filter element that a kind of difficult obstruction is provided and has been convenient to regenerate to society, and its manufacture process is simple, safe and sanitary, non-environmental-pollution.Its application comprises the filter element in chemical industry, agricultural, automobile emission, sewage disposal, air cleaner, moisture trap, oil water separator, silencer, medical sanitary apparatus, the various Filters.Preparation technology of the present invention adopts the direct heat conduction of metal, has improved the utilization ratio of heat energy greatly.
Appended drawings is the section photo of filter element one embodiment of the present invention, and it is little that the micropore size is contended gradual change to left down among the figure from the upper right corner.
The specific embodiment specifically describes the present invention below by embodiment; be necessary to be pointed out that at this following examples only are used for that the present invention is further described; can not be interpreted as limiting the scope of the invention; the improvement and the adjustment of some unsubstantialities that the person skilled in art makes according to foregoing invention content and prior art and to the present invention still belong to protection scope of the present invention.In addition, the umber of following examples each component is weight portion.
Embodiment 1
A kind of preparation method of microporous polyethylene plastics filter element: be in 100 parts of adding mixers of polyethylene of 50～300 μ m with particle diameter earlier, and add 2～10 parts of water and stir sealing in the mixer at a high speed, charge into water vapour during stirring, the mixer rotating speed is 9000～12000r/min, and the control temperature continues to stir 3min under 40 ℃ of conditions makes the plastic grain surface obtain low boiling solution film parcel.
The powder that mixing is stirred fills up mould then, and mould is put into firing equipment the upper and lower mould of mould is carried out the isothermal preheating, and preheat temperature is controlled at 80 ± 1 ℃, and be 5min preheating time.
Again that preheating is good mould is put into micro-processor controlled firing equipment, and the upper and lower surface of mould is carried out not isothermal heating, and the patrix temperature is 170～180 ℃, and the counterdie temperature is 130～140 ℃, continues 200s, applies certain pressure simultaneously and makes the moulding of plastics powder.
To add mould that hot pressing finishes at last and put into cooling device and cool off, the patrix temperature is cooled to 20～40 ℃ in 70s, and the counterdie temperature is cooled to 30～50 ℃ in 70s, and cooling continues simultaneously to keep-up pressure and makes the moulding of cellular plastic element.
Cellular plastic element distribution gradient on thickness direction of gained, the filter opening pore diameter range is at 50 μ m to 0.5 μ m.
Embodiment 2
A kind of preparation method of capillary polypropylene filter element: be in 100 parts of adding mixers of polyethylene of 200～450 μ m with particle diameter earlier, and add 2～5 parts of water and stir sealing in the mixer at a high speed, charge into water vapour during stirring, the mixer rotating speed is 6000～8000r/min, and the control temperature continues to stir 4min under 45 ℃ of conditions makes the plastic grain surface obtain low boiling solution film parcel.
The powder that mixing is stirred fills up mould then, and mould is put into firing equipment the upper and lower mould of mould is carried out the isothermal preheating, and preheat temperature is controlled at 70 ± 1 ℃, and be 5min preheating time.
Again that preheating is good mould is put into micro-processor controlled firing equipment, and the upper and lower surface of mould is carried out not isothermal heating, and the patrix temperature is 180 ℃, and the counterdie temperature is 150 ℃, continues 4min, applies certain pressure simultaneously and makes the moulding of plastics powder.
To add mould that hot pressing finishes at last and put into cooling device and cool off, the patrix temperature is cooled to 20～40 ℃ in 70s, and the counterdie temperature is cooled to 30～60 ℃ in 70s, and cooling continues simultaneously to keep-up pressure and makes the moulding of cellular plastic element.
Micropore high molecule plastic element micropore size distribution gradient on thickness direction of gained, the filter opening pore diameter range is at 100 μ m to 40 μ m.
Embodiment 3
The preparation method of a kind of capillary polypropylene and polyethylene mixture filter element: polypropylene, the 60 parts of particle diameters that are 200～400 μ m with 40 parts of particle diameters are the polyethylene of 50～300 μ m earlier, stirring at low speed is even in the adding mixer, adding 5～10 parts of water again stirs sealing in the mixer at a high speed, charge into water vapour during stirring, the mixer rotating speed is 5000r/min, and the control temperature continues to stir 8min under 50 ℃ of left and right sides conditions makes the plastic grain surface obtain low boiling solution film parcel.
The powder that mixing is stirred fills up mould then, and mould is put into firing equipment the upper and lower mould of mould is carried out the isothermal preheating, and preheat temperature is controlled at 75 ± 1 ℃, and be 7min preheating time.
Again that preheating is good mould is put into micro-processor controlled heater, and the upper and lower surface of mould is carried out not isothermal heating, and the patrix temperature is 140 ℃, and the counterdie temperature is 170 ℃, continues 7min, applies certain pressure simultaneously and makes the moulding of plastics powder.
To add mould that hot pressing finishes at last and put into cooling device and cool off, the patrix temperature is cooled to 30～60 ℃ in 70s, and the counterdie temperature is cooled to 20～40 ℃ in 70s, and cooling continues simultaneously to keep-up pressure and makes the moulding of cellular plastic element.
Micropore high molecule plastic element micropore size on thickness direction of gained changes in gradient, and the filter opening pore diameter range is at 200 μ m to 100 μ m.
Embodiment 4
A kind of preparation method of capillary polypropylene filter element: be in 100 parts of adding mixers of polypropylene of 60～400 μ m with particle diameter earlier, and add 4～7 parts of water and stir sealing in the mixer at a high speed, charge into water vapour during stirring, the mixer rotating speed is 6000～10000r/min, and the control temperature continue to stir 10min at 60 ℃ under with interior condition makes the plastic grain surface obtain low boiling solution film parcel.
The powder that mixing is stirred fills up mould then, and mould is put into firing equipment the upper and lower mould of mould is carried out the isothermal preheating, and preheat temperature is controlled at 65 ± 1 ℃, and be 10min preheating time.
Again that preheating is good mould is put into micro-processor controlled heater, and the upper and lower surface of mould is carried out not isothermal heating, and the patrix temperature is 170 ℃, and the counterdie temperature is 130 ℃, continues 10min, applies certain pressure simultaneously and makes the moulding of plastics powder.
To add mould that hot pressing finishes at last and put into cooling device and cool off, the patrix temperature is cooled to 20～40 ℃ in 100s, and the counterdie temperature is cooled to 30～60 ℃ in 100s, and cooling continues simultaneously to keep-up pressure and makes the moulding of cellular plastic element.
Micropore high molecule plastic element micropore size on thickness direction of gained changes in gradient, and the filter opening pore diameter range is at 450 μ m to 60 μ m.
Claims (4)
1. cellular plastic filter element, be that the micropore that plastic mould pressing system forms has the section bar material, it is characterized in that the material that is adopted is the mixture of polyethylene powder or polypropylene powder or polyethylene powder and polypropylene powder, structurally the filter opening aperture along on the filtering direction from more than 0.5 μ m, changing in gradient below the 500 μ m.
2. cellular plastic filter element as claimed in claim 1, on its filtering direction initial surface to the filter opening average pore size difference of terminal surface more than 45 μ m.
3. the manufacture method of cellular plastic filter element as claimed in claim 1 is characterized in that its technical process is:
I. mix agitating procedure, the plastics powder is added mixer and adds water and steam stir with the rotating speed more than the 5000r/min, the temperature of mixing plastics powder in the agitating procedure is controlled at 40～60 ℃;
Ii. preheating procedure, to add subsequently through the plastics powder that stirs and evenly heat in the mould and reach mould and plastics powder constant temperature wherein, and guarantee every mould thermostat temperature unanimity of same specification product, heating-up temperature should be lower than the temperature that water evaporates in mould, thermostat temperature is controlled at 60 ℃～80 ℃ in the preheating procedure;
Iii. compression molding operation, filtering direction according to filter element after the moulding, in the upstream and downstream of filter element mould is carried out not isothermal heating respectively, upstream temperature is lower than downstream temperature, degree of heat is melted in the scope of whole thawings making plastics begin the part, and the heating-up temperature scope is 130～180 ℃ in the compression molding operation;
Iv. refrigerating work procedure, refrigerating work procedure carries out in mould, in the filter element upstream and downstream mould is carried out in various degree controlled cooling respectively.
4. the manufacture method of cellular plastic filter element as claimed in claim 3 is characterized in that the water weight that is added is to stir to finish 2～10% of thing weight in mixing agitating procedure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200810120988XA CN101402011B (en) | 2008-09-10 | 2008-09-10 | Cellular plastic filter element and method of producing the same |
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| CN200810120988XA CN101402011B (en) | 2008-09-10 | 2008-09-10 | Cellular plastic filter element and method of producing the same |
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| CN101402011A CN101402011A (en) | 2009-04-08 |
| CN101402011B true CN101402011B (en) | 2011-07-20 |
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| JP2011152490A (en) * | 2010-01-26 | 2011-08-11 | Panasonic Electric Works Co Ltd | Filter medium, water treatment apparatus using the filter medium, and method for manufacturing the filter medium |
| CN101880416B (en) * | 2010-06-03 | 2012-02-01 | 潘少白 | Manufacturing method of flame retardant filter acid film on battery safety valve |
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Owner name: SUZHOU KAHO MACROMOLECULE TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: ZHOUSHAN HONGYUAN POLYMER SCIENCE AND TECHNOLOGY CO., LTD. Effective date: 20130829 |
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Effective date of registration: 20130829 Address after: 215211 Jiangsu city of Suzhou province Wujiang city FENHU Economic Development Zone Huxin Road on the north side of Lin Sheng Patentee after: SUZHOU KAHO POLYMER TECHNOLOGY Co.,Ltd. Address before: Salt storage area, Dinghai Industrial Park, Zhejiang, Zhoushan Patentee before: ZHOUSHAN HONGYUAN POLYMER SCIENCE AND TECHNOLOGY Co.,Ltd. |
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