CN1705554A - Pre-filter material - Google Patents

Pre-filter material Download PDF

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Publication number
CN1705554A
CN1705554A CNA2003801016666A CN200380101666A CN1705554A CN 1705554 A CN1705554 A CN 1705554A CN A2003801016666 A CNA2003801016666 A CN A2003801016666A CN 200380101666 A CN200380101666 A CN 200380101666A CN 1705554 A CN1705554 A CN 1705554A
Authority
CN
China
Prior art keywords
plastics
solid matter
moulded body
granular solid
plastics moulded
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CNA2003801016666A
Other languages
Chinese (zh)
Inventor
安东尼奥·詹格拉索
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pfleiderer Water Systems GmbH
Original Assignee
Pfleiderer Water Systems GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pfleiderer Water Systems GmbH filed Critical Pfleiderer Water Systems GmbH
Publication of CN1705554A publication Critical patent/CN1705554A/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/30—Processes for preparing, regenerating, or reactivating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/16—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/1638—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being particulate
    • B01D39/1653—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being particulate of synthetic origin
    • B01D39/1661—Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being particulate of synthetic origin sintered or bonded
    • 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/006—Pressing and sintering powders, granules or fibres
    • 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
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/02—Moulding by agglomerating
    • B29C67/04—Sintering
    • 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
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/20—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 for porous or cellular articles, e.g. of foam plastics, coarse-pored
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/25—Solid
    • B29K2105/251—Particles, powder or granules

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Analytical Chemistry (AREA)
  • Organic Chemistry (AREA)
  • Filtering Materials (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

The invention relates to a plastic moulded body which comprises irregularly sintered granulate plastic particles having a density of 0.6 1.2 g/cm<3> and a bulk density (DIN-ISO 60) of 150 -250 g/l. The inventive plastic moulded bodies are extremely well-suited for use as a pre-filter material in the form of a bed.

Description

Pre-filter material
The present invention relates to a kind of plastics moulded body and production method thereof and its with the bed form as pre-filter material.
Prefilter is generally used for filtering open grain particle such as dirt particles from solution, is further purified solution by the downstream fine filter then.The use of prefilter is essential, is stopped up by coarse granule to avoid fine filter, and prevents the weakening of the filter capacity that causes thus.
Sand, rubble, volcanic rock and earthenware are through being often used as prefilter material.The filtering characteristic of described material produces as bed by using them.But the use of sand, rubble and volcanic rock often is disadvantageous, and this is because these materials only demonstrate less filter efficiency with respect to own wt.And because it is relatively very little to form the particle of bed, cleaning is husky and rubble is very difficult.In addition, earthenware also has shortcoming, and that is exactly, and ceramic particle dissolves from pipe in filter process, and this causes the filtrate impurity do not expected.
In addition, the known velveteen of using is as pre-filter material, to filter thick impurity from solution.But the shortcoming of velveteen is relatively easily blocked, and the cleaning difficulty.
Therefore, the object of the present invention is to provide the low weight pre-filter material of easy cleaning, its pressure loss is less, even and also can show very high efficient with less bed height in filter process.
Realized this purpose by plastics moulded body, this plastics moulded body comprises that density is 0.6 to 1.2g/cm 3The granular plastic grain of irregular sintering, its bulk density is 150 to 250g/l.This class plastics moulded body can the bed form be used as favourable prefilter.
In order to prepare with the plastics moulded body of the present invention of bed form as pre-filter material, plastics are packed into brokenly with the coarse granule form in the sintering mould, and being heated to uniform temperature therein, the very high so that plastic grain of this temperature begins at surface melting but penetration fully.Therefore, plastic grain is sintered at contact surface, obtains stable sinter after the cooling, plastics moulded body promptly of the present invention.
The plastics that use with the coarse granule form can be that density is 0.6 to 1.2g/cm 3, preferred 0.8 to 1.0g/cm 3Any commercially available plastics, it can particle form obtain.Polyethylene and polypropylene preferably are used.Also can use the mixture of different plastics, but will consider following aspect: particle surface should have similar initial melting temperature.
About initial melting temperature, dimension card (Vicat) softening temperature of granular solid matter preferably between 60 to 100 ℃, is preferably 70 to 90 ℃ especially.Plastics with above-mentioned indication vicat softening temperature scope often have the initial melting temperature between 80 to 220 ℃, and this initial melting temperature is particularly suitable for the preparation of plastics moulded body of the present invention.
The plastics granular solid matter can have arbitrary shape, is preferably strip, cylindric, spherical or lens shape, preferred especially strip or lens shape.Preferably, the size ranges of granular solid matter is 2mm to 10mm, preferred especially 4mm to 7mm.For spherical or lenticular granular solid matter, " average-size " is meant diameter.The strip granular solid matter can be circle, avette, ellipsoidal or irregular." average-size " of strip granular solid matter is meant maximum gauge.The thickness of small pieces is preferably 0.05 to 2.5mm.Also feasible is to use the mixture of variable grain form to reach degree of irregularity high as far as possible in the gained plastics moulded body.Degree of irregularity is very important, especially when using plastics moulded body as pre-filter material because degree of irregularity at liquid through the out-of-date turning point that produced.Turning point is many more, and filtration is just big more.
As the plastics moulded body of the present invention of bed also have 150 to 250g/l, preferred 150 to 200g/l bulk density.Bulk density is measuring of the scrambling that is sintered of granular solid matter.Granular solid matter is irregular more in plastics moulded body, and the fusing contact surface of granular solid matter is more little, and bulk density is just more little.In addition, bulk density depends on the size of used granular solid matter, and just used granular solid matter is more little, and the bulk density of the molding that makes with this granular solid matter is just high more.
Plastics moulded body of the present invention can have arbitrary dimension and shape.Preferably, it has platelet morphology, and the surface of small pieces is round.The diameter range of small pieces is preferably 1 to 10cm, and preferred especially 2 to 6cm.The thickness range of small pieces is preferably 0.5 to 2cm.
The specific area scope of plastics moulded body of the present invention is preferably 15 to 80cm 2/ g, preferred especially 20 is to 40cm 2/ g.Surface size can be regulated by the size of used granular solid matter, and granular solid matter is more little, and the plastics moulded body surface that obtains is big more.And the surface is subjected to the influence of sintering degree, and the sintering contact surface between granular solid matter is more little, and the surface of the plastics moulded body of the present invention that obtains is just big more.
Plastics moulded body of the present invention self can be porous or non-porous, just between granular solid matter free space being arranged separately, also can not have.
Below the manufacture method of plastics moulded body of the present invention will be described more specifically.
This method comprises the steps:
(a) the two layers of plastic granular solid matter is encased in the mould at least,
(b) evenly this plastics granular solid matter of heating is to uniform temperature in sintering furnace, and the plastics granular solid matter only begins fusing on the surface under this temperature, but does not have complete penetration,
(c) be cooled to room temperature and
(d) make the plastics moulded body demoulding.
In step (a), the plastics granular solid matter is loaded in the mould, and the suggestion charge weight is two layers of polymers particle at least.If the granular solid matter in the sintering mould is irregular as far as possible and contact surface is as far as possible little, this is favourable.In order to reach this purpose, granular solid matter is packed into by slot nozzle in the mould, obtains irregular bed at random thus.Sintering mold has arbitrary dimension and shape, and the size and dimension of the plastics moulded body that can obtain according to hope is selected.
The heating of describing in the step (b) is carried out in sintering furnace, thus plastic grain is evenly heated from all sides.In order to make surface melting, the temperature of plastic grain heating depends on selected plastics.Polyethylene and polyacrylic temperature are usually between 80 to 220 ℃.When the plastic material of forming the plastics granular solid matter presents glass-like appearance, just reach initial melting temperature.Be preferably 5 to 60 minutes heat time heating time, be preferably 15 to 20 minutes especially.
In the step (c), the plastics granular solid matter of surface melting is cooled to room temperature.Preferably, cooling is carried out very soon, is promptly undertaken by quenching, for example utilizes the mode of cold air blowing.Then, in step (d), make the plastics moulded body demoulding of cooling.
Plastics moulded body of the present invention is especially suitable for use as pre-filter material.In order to reach this purpose, it uses with the form of expanded bed.Because the irregular structure of independent plastics moulded body of the present invention, when liquid by the time produce vortex, this vortex is also referred to as turning point.These turning points produce filtrations, and when liquid flow through bed, particle to be filtered in the liquid rested on the plastics moulded body.In order to reach fabulous filtration, because a plurality of turning points, the lower height of bed is just enough.The bed that can be used as the plastics moulded body of the present invention of pre-filter material has a following advantage: when liquid by the time show the less pressure loss, have less weight, chemically stable, and order is easy to clean.
Embodiment
5.5g high density polyethylene (HDPE) granular solid matter (Hostalen  GM 6255 is produced by Elenac) is loaded in the circular sintering mould that diameter is 55mm.Used poly density (23 ℃ ISO1183) are 0.951g/cm 3, Vicat softening point B/SO (ISO 306) is 84 ℃.
The mould that granular solid matter is housed heated in sintering furnace 20 minutes, reached 210 ℃ temperature.In this Temperature Treatment, granular solid matter begins at surface melting, thereby melts mutually at their contact surface.Then, mould is taken out from stove, come molding is quenched by being blown into cold air.The specific area of the plastics moulded body that obtains thus is 20 to 40cm 2/ g, the bulk density of bed form is 160 to 180g/l.
The mensuration of bulk density:
Measure bulk density according to DIN-ISO 60.
The mensuration of specific area:
The specific area of plastics moulded body of the present invention utilizes kind of calliper to measure.Therefore hypothesis can not show microporosity on its surface as the plastic grain of plastics moulded body, this also by the Krypton gas adsorption method through experiment confirm.
When measurement the specific area, form the granular solid matter of 10 plastic bodies of plastics moulded body with kind of calliper.Granular solid matter can not have contribution to the surface in mutual fusing of contact surface and contact surface, so the ratio of contact surface is deducted.Therefore, the surface of being measured is relevant with the 1g plastics moulded body, and weight is measured with weight method.

Claims (8)

1. the plastics moulded body that comprises the plastics granular solid matter of irregular sintering, the density of this granular solid matter are 0.6 to 1.2g/cm 3, the bulk density of this molding (DIN-ISO 60) is 150 to 250g/l.
2. plastics moulded body as claimed in claim 1, wherein the scope of bulk density is 150 to 200g/l.
3. plastics moulded body as claimed in claim 1 or 2, wherein the plastics granular solid matter is polyethylene or polypropylene.
4. as one in the claim 1 to 3 or multinomial described plastics moulded body, wherein the plastics granular solid matter is a lenticular.
5. or the method for multinomial described plastics moulded body in manufacturing such as the claim 1 to 4, this method comprises the steps:
(a) the two layers of plastic granular solid matter is encased in the mould at least,
(b) heat this plastics granular solid matter to uniform temperature, the plastics granular solid matter only begins fusing on the surface under this temperature, but does not have complete penetration,
(c) be cooled to room temperature and
(d) make the plastics moulded body demoulding of sintering.
6. method as claimed in claim 4, wherein the cooling in step (d) is to quench.
7. as one in the claim 1 to 4 or the purposes of multinomial described plastics moulded body, it is used as pre-filter material with the bed form.
8. as the bed of in the claim 1 to 4 or multinomial described plastics moulded body.
CNA2003801016666A 2002-10-16 2003-10-14 Pre-filter material Pending CN1705554A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10248201A DE10248201B4 (en) 2002-10-16 2002-10-16 prefilter
DE10248201.2 2002-10-16
DE20215896.9 2002-10-16

Publications (1)

Publication Number Publication Date
CN1705554A true CN1705554A (en) 2005-12-07

Family

ID=32086931

Family Applications (1)

Application Number Title Priority Date Filing Date
CNA2003801016666A Pending CN1705554A (en) 2002-10-16 2003-10-14 Pre-filter material

Country Status (2)

Country Link
CN (1) CN1705554A (en)
DE (1) DE10248201B4 (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1529852B2 (en) * 1963-08-23 1970-11-12 Deutsche Edelstahlwerke Ag, 4150 Krefeld Manufacture of sintered plastic workpieces from polytetrafluoroethylene
EP0645419B1 (en) * 1992-05-18 2000-08-30 Obshchestvo S Ogranichennoy Otvetstvennostyu Polimerplast Porous material and method for its preparation
DE19700760C2 (en) * 1997-01-11 2000-11-09 Microdyn Modulbau Gmbh & Co Kg Process for producing porous molded articles from thermoplastic polymers, porous molded articles and use of the molded articles

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Publication number Publication date
DE10248201A1 (en) 2004-05-06
DE10248201B4 (en) 2006-09-07

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PB01 Publication
C02 Deemed withdrawal of patent application after publication (patent law 2001)
WD01 Invention patent application deemed withdrawn after publication