CN102501366A - Preparation method of hollow filtering member and product thereof - Google Patents
Preparation method of hollow filtering member and product thereof Download PDFInfo
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- CN102501366A CN102501366A CN2011103325891A CN201110332589A CN102501366A CN 102501366 A CN102501366 A CN 102501366A CN 2011103325891 A CN2011103325891 A CN 2011103325891A CN 201110332589 A CN201110332589 A CN 201110332589A CN 102501366 A CN102501366 A CN 102501366A
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Abstract
The invention relates to a preparation method of a hollow filtering member and a product thereof. The method comprises the following steps of: mixing the ultra-high molecular weight polyethylene powder serving as a base material with auxiliary materials to obtain the material of a filtering member, and filling the material into a designed mould; heating and pressurizing the mould; and demoulding to obtain the hollow filtering member. In the invention, the existing particle sintering method is technically improved, the processing time is shortened, and a membrane with stable performance and good filtering effect can be obtained according to the needs; and particularly, a mould is designed in the test process, and a hollow integrated filtering device can be formed, thereby being favorable for using and popularizing the technology.
Description
Technical field
The invention belongs to liquid, gas scavenging material manufacture field, be specifically related to a kind of hollow filter member preparation method and products thereof.
Background technology
The kind and the processing method of filtering material are varied, have advantages such as easy to process, excellent performance, long service life, good filtration effect and select for use ultra-high molecular weight polyethylene (UHMWPE) powder to prepare filter element.Aspects such as at present, the UHMWPE filtering material filters at " three dirts " filtration treatment, liquor, chemicals filters, oil filtration, battery isolating film more and more come into one's own.The UHMWPE raw material that offshore companies such as Ticona, Mitsui Chemicals, Brazilian petrochemical industry actively promote in recent years is in the application of filtration art, and formed the different trades mark according to different purposes.
The backbone of UHMWPE; Have good mechanical performance and excellent shock-resistant, wear-resistant, self-lubricating, resistance to chemical attack, quality such as low temperature resistant; And as dusty raw materials; Can form certain size grading, can under specific processing conditions, prepare the membrane material of different purposes, produce different filter effect.The present invention is based on the architectural feature of UHMWPE, on the basis of conventional particles sintering process, improve processing technology, and designing mould, carry out the processing and preparing of UHMWPE filter member.
When the prior art sintering prepared micro-filtration membrane, feed particles only had melt surface rather than fine melt, formed network-like through hole in the inner bonding each other of filter membrane.The size of network through hole and distribution with the size of UHMWPE powder and distribute relevantly, also have certain related with the technology of sintering compacting.And the filter that sintering preparation forms often forms certain pore-size distribution gradient at thickness direction, helps filtrate is carried out the filtration of multi-level different stage.
The filter type of filter member comprises following several kinds: 1) physics dams.This kind mode mainly is to utilize network-like through hole in the film to reach the purpose of the solid particle that dams.Network-like through hole is isotropic three-D space structure, and its micropore is staggered up and down, makes effective diameter reduce; On the other hand, all between particle, this a part of pore size has determined to filter the precision that can reach to the less part of through-hole aperture basically.2) suction type.Because the particle diameter of UHMWPE powder is less, and most of particle has kept original shape basically when sinter molding, so the UHMWPE particle in the filtration membrane also has bigger specific area, and the impurity that is filtered in the medium is had certain suction-operated.3) obstruction is dammed.Impurity in the filter medium or microorganism are when being adsorbed to the UHMWPE surface, and a part of particle has also played ponding to the network-like through hole in the film.This obstruction has just reduced the effective aperture of fenestra, rather than the hole is blocked fully.Neck portion is the key point of damming, and the obstruction of the neck portion of through hole is especially crucial.This obstruction can improve the filtering accuracy of micro-filtration membrane to a certain extent.The filtration to water or other medium of filter member of the present invention realizes through above several kinds of modes.
The present invention combines physics, the chemical feature of UHMWPE powder, and existing particle sintering method is carried out initiative technological improvement, and material formula and mould through design have voluntarily formed corresponding processing technology.Because the variation of material formula, the variation of mould and according to the accumulation of test experience the present invention proposes different process; Comprise corresponding temperature, pressure limit; Not only shortened the time of processing, and stable, the good filter member of filter effect of obtained performance as required, mould in process of the test, designed especially; Can form the filter element of hollow one, help this The Application of Technology and promote.
Summary of the invention
The sintering process that the objective of the invention is to pass through and the mould of design form efficient, practical ultra-high molecular weight polyethylene filter member.
The present invention proposes a kind of preparation method of hollow filter member, may further comprise the steps:
Step 1: the ultra-high molecular weight polyethylene powder as matrix material, is mixed to obtain the filter member material with auxiliary material, insert in the mould of design;
Step 2: the mould to inserting the said design behind the filter member material heats, pressurizes;
Step 3: the demoulding forms said hollow filter member.
Wherein, the viscosity average molecular weigh of said ultra-high molecular weight polyethylene powder is 1,000,000 ~ 1,000 ten thousand, and average grain diameter is 20 ~ 300um.
Wherein, said auxiliary material can be in the following material one or more: powdery high density polyethylene (HDPE), addition are 5% ~ 15%; Powdery low density polyethylene (LDPE), addition are 3% ~ 5%; Other functional additive comprises hydrophilizing agent, pore-foaming agent, activator, antioxidant, and addition is 0.5% ~ 10%; Activated carbon, addition are 5% ~ 10%; Carbon black, addition are 1% ~ 5%; Calcium carbonate, addition are 1% ~ 10%; Polyethylene glycol oxide, addition are 5% ~ 10%; Sodium chloride, addition are 0.5% ~ 3%; Wherein, said addition is auxiliary material shared ratio in said filter member material.
Wherein, the mould of said design comprises patrix, middle mould, counterdie and dividing plate; Described upper die and lower die structure is identical; Said upper die and lower die are two flat boards, and said middle mould has certain space between said upper die and lower die; Mould is the cuboid that uncovered does not have the end in said, and the middle part, edge of said middle mould is provided with the strip perforate; Be inserted with said dividing plate in the said perforate; Said dividing plate is dull and stereotyped, its smooth surface or have waveform or decorative pattern shape, and thickness is 0.5 ~ 60mm, length and width is 8 ~ 900mm.
Wherein, in the said step 2 heating, the pressurization process do, mould is warmed up to 70 ~ 120 ℃ under 0.5 ~ 5MPa pressure, the time of staying is 5 ~ 120min; Pressure is adjusted to 0.1 ~ 1MPa, be warmed up to 140 ~ 210 ℃, the time of staying is 3 ~ 60min; With below the mold cools down to 70 ℃ and keep 5 ~ 30min.
Wherein, the process of heating in the said step 2, pressurization realizes through press, compression molding machine equipment.
Wherein, said mould is carried out surface treatment.Said surface-treated method can be conveniently stripped, for example through applying Teflon material etc. at die surface.
The invention allows for a kind of hollow filter member prepared according to the methods of the invention, it comprises: the ultra-high molecular weight polyethylene powder accounts for 85% of said filter member material at least as matrix material; Auxiliary material accounts for 15% of said filter member material at the most.
Wherein, said hollow filter member is a cuboid, and the middle part has engraved structure.
Wherein, the thickness of said hollow filter member is 1.5 ~ 100mm, and length and width is 10 ~ 1000mm, and wherein the thickness of openwork part is 0.5 ~ 60mm, and length and width is 8 ~ 900mm.
The present invention has adopted different process according to the variation of the material formula of filter member material, the variation of mould.Constantly shortened the time of processing, and can stable, the good filter member of filter effect of obtained performance.
Description of drawings
Fig. 1 is hollow filter member preparation method's of the present invention schematic flow sheet.
Fig. 2 is the hollow filter member sketch map of the present invention's preparation.Wherein, the front view that Fig. 2 A is, Fig. 2 B are vertical view.
Fig. 3 is one sketch map in the upper and lower mould of preparation method's mould therefor of the present invention.Wherein, Fig. 3 A is the front view of patrix or counterdie, and Fig. 3 B is the vertical view of patrix or counterdie.
Fig. 4 is the middle mould sketch map of preparation method's mould therefor of the present invention.Wherein, Fig. 4 A is a front view, and Fig. 4 B is a vertical view.
Fig. 5 is the sketch map of the used dividing plate of preparation method of the present invention.
Fig. 6 is for being inserted with the middle mould sketch map of dividing plate among the preparation method of the present invention.
The specific embodiment
In conjunction with following specific embodiment and accompanying drawing, the present invention is done further detailed description, protection content of the present invention is not limited to following examples.Under spirit that does not deviate from inventive concept and scope, variation and advantage that those skilled in the art can expect all are included among the present invention, and are protection domain with the appending claims.
Among Fig. 1-3,1-engraved structure, 2-handle, 3-perforate, 4-patrix, mould among the 5-, 6-counterdie, 7-hollow filter member, 8-dividing plate 8.
As shown in Figure 1, the preparation method of a kind of hollow filter member of the present invention comprises:
Step 1: the ultra-high molecular weight polyethylene powder as matrix material, is mixed to obtain the filter member material with auxiliary material, insert in the mould of design;
Step 2: the mould to inserting the said design behind the filter member material heats, pressurizes;
Step 3: the demoulding forms said hollow filter member.
The preparation method of the novel hollow filter member of the present invention adopts the ultra-high molecular weight polyethylene powder as matrix material, and it is inserted in the mould of design, and the process through heating, pressurization forms hollow filter member 7.Wherein, the viscosity average molecular weigh of matrix material ultra-high molecular weight polyethylene is 1,000,000～1,000 ten thousand, and average grain diameter is 20 ~ 300um.
The matrix material ultra-high molecular weight polyethylene that the inventive method is used accounts for 85% of filter member material at least.Auxiliary material can be in the following material one or more: powdery high density polyethylene (HDPE), addition are 5% ~ 15%; Powdery low density polyethylene (LDPE), addition are 3% ~ 5%; Other functional additive comprises hydrophilizing agent, pore-foaming agent, activator, antioxidant etc., and addition is 0.5% ~ 10%.Like activated carbon, addition is 5% ~ 10%; Carbon black, addition are 1% ~ 5%; Calcium carbonate, addition are 1% ~ 10%; Polyethylene glycol oxide, addition are 5% ~ 10%; Sodium chloride, addition are 0.5% ~ 3%.
For the mould of realizing the inventive method design comprises patrix 4, middle mould 5, counterdie 6, shown in Fig. 3-4, patrix 4, counterdie 6 structures are identical, only show a patrix or counterdie among Fig. 3.Patrix 4 or counterdie 6 are made up of flat board, and both sides respectively are provided with handle 2, handled easily in processing.Fig. 4 is shown as middle mould 5; Middle mould 5 middle parts are provided with perforate 3, are inserted with dividing plate 8 in the perforate 3, and the effect of dividing plate 8 is hollow structures of realizing filter member; Dividing plate 8 is ganoid flat board or surperficial plate with waveform or decorative pattern shape; It is corresponding that the size of dividing plate 8 and the size of mould are carried out, and it optimizes size: thickness 0.5 ~ 60mm, length and width are 8 ~ 900mm.
The step of filling filter member material of the present invention is: at first at the inner surface of patrix 4, middle mould 5, counterdie 6, be coated with one deck Teflon material on the surface of dividing plate 8, with counterdie 6 be placed on the bottom, in mould 5 be arranged on the counterdie 6, be positioned at the middle part of counterdie 6.In again the filter member material that mixes being packed in the formingspace of mould 5; When the filter member material is filled to perforate 3 places of middle mould 5; Mould 5 during dividing plate 8 inserted through perforate 3, and stretch out fixedly continued filling filter member material by the perforate 3 of the other end, until middle mould 5 is filled up.The filling of filter member material is accomplished in the top of mould 5 at last patrix 4 being fastened on.
Fill the processing method of in the filter member material step die surface being used and can make the surface of mould and dividing plate 8 produce NA effect, can realize the disengaging of finished product and mould, conveniently stripped.Die surface can adopt Teflon to handle, and also can adopt material that other and Teflon have same effect as coating material.The Teflon material also can only be coated in the surface that contacts with finished product.
The heating of the inventive method, pressurization detailed process are: the mould that at first will install raw material is warmed up to 70 ~ 120 ℃ under 50 ~ 100MPa pressure, the time of staying is 5 ~ 120min; Pressure to the 10 ~ 50MPa of back adjustment mould continues to be warmed up to 140 ~ 210 ℃, and the time of staying is 3 ~ 60min; After be cooled to below 70 ℃ and keep 5 ~ 30min, the demoulding obtains the hollow filter assemblies.Heating, pressuring method can heat through press, vulcanizing press or other simultaneously, pressurised equipment realizes.
As shown in Figure 2; The hollow filter member that the inventive method preparation forms is a cuboid; The size of hollow filter member 7 can design as required, and it optimizes size: gross thickness is 1.5 ~ 100mm, and length and width is 10 ~ 1000mm; Wherein the thickness of openwork part is 0.5 ~ 60mm, and length and width is 8 ~ 900mm.
At first, be coated with one deck Teflon material on the surface of dividing plate 8 at the inner surface of patrix 4, middle mould 5, counterdie 6.Counterdie 6 is placed on the bottom, middle mould 5 is arranged on the counterdie 6, agree with mutually with counterdie 6.Viscosity average molecular weigh with certain mass is 6,000,000 again; Average grain diameter is in the formingspace of mould 5 during the ultra-high molecular weight polyethylene of 150um is packed into; When ultra-high molecular weight polyethylene is filled to perforate 3 places of middle mould 5; Mould 5 during dividing plate 8 inserted through perforate 3, and stretch out fixedly continued filling by the perforate 3 of the other end, until middle mould 5 is filled up.The top of mould 5 is accomplished and is filled at last patrix 4 being fastened on.
Then entire die is warmed up to 100 ℃ under 3MPa pressure, the time of staying is 15min; The pressure of back adjustment mould continues to be warmed up to 150 ℃ to 0.5MPa, and the time of staying is 15min; After be cooled to 40 ℃ and keep 20min, the demoulding obtains the hollow filter member.The gross thickness of hollow filter member 7 is 6mm, and length is 360mm, and width is 220mm, and wherein the thickness of openwork part is 2mm, and length is that 360mm, width are 200mm.
At first, be coated with one deck Teflon material on the outer surface of dividing plate 8 at the inner surface of patrix 4, middle mould 5, counterdie 6.Counterdie 6 is placed on the bottom, middle mould 5 is arranged on the counterdie 6, agree with mutually with counterdie 6.Viscosity average molecular weigh with certain mass is 3,500,000 again; Average grain diameter is in the formingspace of mould 5 in the packing into of ultra-high molecular weight polyethylene of 250um; When ultra-high molecular weight polyethylene is filled to perforate 3 places of middle mould 5; Mould 5 during dividing plate 8 inserted through perforate 3, and stretch out fixedly continued filling by the perforate 3 of the other end, until middle mould 5 is filled up.The top of mould 5 is accomplished and is filled at last patrix 4 being fastened on.
Then entire die is warmed up to 110 ℃ under 2MPa pressure, the time of staying is 20min; The pressure of back adjustment mould continues to be warmed up to 150 ℃ to 0.5MPa, and the time of staying is 20min; After be cooled to 40 ℃ and keep 20min, the demoulding obtains the hollow filter member.The gross thickness of hollow filter member 7 is 6mm, and length is 340mm, and width is 220mm, and wherein the thickness of openwork part is 2mm, and length is that 340mm, width are 200mm.
At first, be coated with one deck Teflon material on the outer surface of dividing plate 8 at the inner surface of patrix 4, middle mould 5, counterdie 6.Counterdie 6 is placed on the bottom, middle mould 5 is arranged on the counterdie 6, agree with mutually with counterdie 6.Viscosity average molecular weigh with certain mass is 3,500,000 again; Average grain diameter is in the formingspace of mould 5 in the packing into of ultra-high molecular weight polyethylene of 30um; When ultra-high molecular weight polyethylene is filled to perforate 3 places of middle mould 5; Mould 5 during dividing plate 8 inserted through perforate 3, and stretch out fixedly continued filling by the perforate 3 of the other end, until middle mould 5 is filled up.The top of mould 5 is accomplished and is filled at last patrix 4 being fastened on.
Then entire die is warmed up to 80 ℃ under 2MPa pressure, the time of staying is 10min; The pressure of back adjustment mould continues to be warmed up to 140 ℃ to 0.3MPa, and the time of staying is 10min; After be cooled to 40 ℃ and keep 20min, the demoulding obtains the hollow filter assemblies.The gross thickness of hollow filter member 7 is 6mm, and length is 300mm, and width is 200mm, and wherein the thickness of openwork part is 2mm, and length is that 300mm, width are 180mm.
At first, be coated with one deck Teflon material on the outer surface of dividing plate 8 at the inner surface of patrix 4, middle mould 5, counterdie 6.Counterdie 6 is placed on the bottom, middle mould 5 is arranged on the counterdie 6, agree with mutually with counterdie 6.Viscosity average molecular weigh with certain mass is 2,500,000 again; Average grain diameter is that ultra-high molecular weight polyethylene (90%), the activated carbon (10%) of 105um stirs; Pack in the formingspace of mould 5, in the filter member material is filled to during perforate 3 places of mould 5, with dividing plate 8 through mould 5 in perforate 3 insertions; And stretch out fixedly continued by the perforate 3 of the other end and fill, until middle mould 5 is filled up.The top of mould 5 is accomplished and is filled at last patrix 4 being fastened on.
Then entire die is warmed up to 90 ℃ under 3MPa pressure, the time of staying is 15min; The pressure of back adjustment mould continues to be warmed up to 140 ℃ to 0.3MPa, and the time of staying is 10min; After be cooled to 40 ℃ and keep 20min, the demoulding obtains the hollow filter assemblies.The gross thickness of hollow filter member 7 is 6mm, and length is 360mm, and width is 220mm, and wherein the thickness of openwork part is 2mm, and length is that 360mm, width are 200mm.
At first, be coated with one deck Teflon material on the outer surface of dividing plate 8 at the inner surface of patrix 4, middle mould 5, counterdie 6.Counterdie 6 is placed on the bottom, middle mould 5 is arranged on the counterdie 6, agree with mutually with counterdie 6.Viscosity average molecular weigh with certain mass is 2,500,000 again; Average grain diameter is that ultra-high molecular weight polyethylene (90%), activated carbon (5%), the calcium carbonate (5%) of 105um stirs; Pack in the formingspace of mould 5, in the filter member material is filled to during perforate 3 places of mould 5, with dividing plate 8 through mould 5 in perforate 3 insertions; And stretch out fixedly continued by the perforate 3 of the other end and fill, until middle mould 5 is filled up.The top of mould 5 is accomplished and is filled at last patrix 4 being fastened on.
Then entire die is warmed up to 95 ℃ under 2MPa pressure, the time of staying is 20min; The pressure of back adjustment mould continues to be warmed up to 145 ℃ to 0.3MPa, and the time of staying is 15min; After be cooled to 40 ℃ and keep 20min, the demoulding obtains the hollow filter assemblies.The gross thickness of hollow filter member 7 is 6mm, and length is 360mm, and width is 220mm, and wherein the thickness of openwork part is 2mm, and length is that 360mm, width are 200mm.
At first, be coated with one deck Teflon material on the outer surface of dividing plate 8 at the inner surface of patrix 4, middle mould 5, counterdie 6.Counterdie 6 is placed on the bottom, middle mould 5 is arranged on the counterdie 6, agree with mutually with counterdie 6.Viscosity average molecular weigh with certain mass is 2,500,000 again; Average grain diameter is that ultra-high molecular weight polyethylene (93%), carbon black (2%), the polyethylene glycol oxide (5%) of 105um stirs; Pack in the formingspace of mould 5, in the filter member material is filled to during perforate 3 places of mould 5, with dividing plate 8 through mould 5 in perforate 3 insertions; And stretch out fixedly continued by the perforate 3 of the other end and fill, until middle mould 5 is filled up.The top of mould 5 is accomplished and is filled at last patrix 4 being fastened on.
Then entire die is warmed up to 80 ℃ under 2MPa pressure, the time of staying is 20min; The pressure of back adjustment mould continues to be warmed up to 150 ℃ to 0.3MPa, and the time of staying is 10min; After be cooled to 40 ℃ and keep 20min, the demoulding obtains the hollow filter assemblies.The gross thickness of hollow filter member 7 is 6mm, and length is 300mm, and width is 200mm, and wherein the thickness of openwork part is 2mm, and length is that 300mm, width are 180mm.
Claims (10)
1. the preparation method of a hollow filter member may further comprise the steps:
Step 1: the ultra-high molecular weight polyethylene powder as matrix material, is mixed to obtain the filter member material with auxiliary material, insert in the mould of design;
Step 2: the mould to inserting the said design behind the filter member material heats, pressurizes;
Step 3: the demoulding forms said hollow filter member (7).
2. the preparation method of hollow filter member as claimed in claim 1 is characterized in that, the viscosity average molecular weigh of said ultra-high molecular weight polyethylene powder is 1,000,000 ~ 1,000 ten thousand, and average grain diameter is 20 ~ 300um.
3. the preparation method of hollow filter member as claimed in claim 1 is characterized in that, said auxiliary material can be in the following material one or more: powdery high density polyethylene (HDPE), addition are 5% ~ 15%; Powdery low density polyethylene (LDPE), addition are 3% ~ 5%; Other functional additive comprises hydrophilizing agent, pore-foaming agent, activator, antioxidant, and addition is 0.5% ~ 10%; Activated carbon, addition are 5% ~ 10%; Carbon black, addition are 1% ~ 5%; Calcium carbonate, addition are 1% ~ 10%; Polyethylene glycol oxide, addition are 5% ~ 10%; Sodium chloride, addition are 0.5% ~ 3%; Wherein, said addition is auxiliary material shared ratio in said filter member material.
4. the preparation method of hollow filter member as claimed in claim 1 is characterized in that, the mould of said design comprises patrix (4), middle mould (5), counterdie (6), dividing plate (8); Described patrix (4), counterdie (6) structure are identical; Said patrix (4), counterdie (6) are two flat boards, and said middle mould (5) has certain space between said patrix (4), counterdie between (6); Mould (5) does not have the cuboid at the end for uncovered in said, said in the middle part, edge of mould (5) be provided with strip perforate (3); Be inserted with said dividing plate (8) in the said perforate (3); Said dividing plate (8) is dull and stereotyped, said dividing plate (8) smooth surface or have waveform or decorative pattern shape, and thickness is 0.5 ~ 60mm, length and width is 8 ~ 900mm.
5. the preparation method of hollow filter member as claimed in claim 1 is characterized in that, in the said step 2 heating, the pressurization process do, mould is warmed up to 70 ~ 120 ℃ under 0.5 ~ 5MPa pressure, the time of staying is 5 ~ 120min; Pressure is adjusted to 0.1 ~ 1MPa, be warmed up to 140 ~ 210 ℃, the time of staying is 3 ~ 60min; With below the mold cools down to 70 ℃ and keep 5 ~ 30min.
6. the preparation method of hollow filter member as claimed in claim 1 is characterized in that, the process of heating in the said step 2, pressurization realizes through equipment such as press, vulcanizing presses.
7. the preparation method of hollow filter member as claimed in claim 1 is characterized in that, wherein, said mould is carried out surface treatment.
8. the hollow filter member according to the said method preparation of claim 1 is characterized in that comprise: the ultra-high molecular weight polyethylene powder accounts for 85% of said filter member material at least as matrix material; Auxiliary material accounts for 15% of said filter member material at the most.
9. hollow filter member as claimed in claim 7 is characterized in that, said hollow filter member (7) is a cuboid, and the middle part has engraved structure (1).
10. hollow filter member as claimed in claim 8 is characterized in that, the thickness of said hollow filter member (7) is 1.5 ~ 100mm, and length and width is 10 ~ 1000mm, and wherein the thickness of openwork part is 0.5 ~ 60mm, and length and width is 8 ~ 900mm.
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| CN104492280A (en) * | 2014-12-22 | 2015-04-08 | 萍乡市普天高科实业有限公司 | Composite membrane filtration pipe and preparation method thereof |
| CN105820416A (en) * | 2016-04-29 | 2016-08-03 | 秦诗发 | 3D sintering anti-static flame retardant air-liquid filter plate |
| CN105817081A (en) * | 2016-04-29 | 2016-08-03 | 秦诗发 | 3D sintering anti-static flame retardant air-liquid filter plate |
| CN105860212A (en) * | 2016-04-29 | 2016-08-17 | 秦诗发 | 3D plastic-sintered antistatic flame-retardant gas-liquid filter cartridge |
| CN106984096A (en) * | 2017-04-28 | 2017-07-28 | 秦诗发 | High temperature corrosion resistant gas-liquid filteration plate |
| CN106994270A (en) * | 2017-04-28 | 2017-08-01 | 秦诗发 | High temperature corrosion resistant air dust remover |
| CN108912458A (en) * | 2018-07-19 | 2018-11-30 | 朱玮 | A kind of preparation method of environment-friendly type ultra-high molecular weight polyethylene filtering material |
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| CN104492280A (en) * | 2014-12-22 | 2015-04-08 | 萍乡市普天高科实业有限公司 | Composite membrane filtration pipe and preparation method thereof |
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| CN106984096A (en) * | 2017-04-28 | 2017-07-28 | 秦诗发 | High temperature corrosion resistant gas-liquid filteration plate |
| CN106994270A (en) * | 2017-04-28 | 2017-08-01 | 秦诗发 | High temperature corrosion resistant air dust remover |
| CN108912458A (en) * | 2018-07-19 | 2018-11-30 | 朱玮 | A kind of preparation method of environment-friendly type ultra-high molecular weight polyethylene filtering material |
| CN110870996A (en) * | 2018-09-02 | 2020-03-10 | 佛山市山圣生物科技有限公司 | Method for manufacturing selenium-rich filter disc |
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