CN102501366B - 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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- CN102501366B CN102501366B CN201110332589.1A CN201110332589A CN102501366B CN 102501366 B CN102501366 B CN 102501366B CN 201110332589 A CN201110332589 A CN 201110332589A CN 102501366 B CN102501366 B CN 102501366B
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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 filtering member preparation method and products thereof.
Background technology
Kind and the processing method of filtering material are varied, and select ultra-high molecular weight polyethylene (UHMWPE) preparation filter element to have the advantages such as easy to process, excellent performance, long service life, good filtration effect.The aspects such as at present, UHMWPE filtering material filters at " three dirts " filtration treatment, white wine, chemicals filters, oil filtration, battery isolating film more and more come into one's own.The UHMWPE raw material that the offshore companies such as Ticona, Mitsui Chemicals, Brazilian petrochemical industry actively promote is in recent years in the application of filtration art, and formed the different trades mark according to different purposes.
The backbone of UHMWPE, there is good mechanical property and excellent shock-resistant, wear-resistant, self-lubricating, resistance to chemical attack, the 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, processing technology, and designing mould, carry out the processing preparation of UHMWPE filtration members.
When prior art sintering is prepared microfiltration membranes, feed particles only has melt surface rather than fine melt, in the inner bonding mutually of filter membrane, forms network-like through hole.The size of network through hole and distribution, with the particle size of UHMWPE powder and distribute relevantly, also have certain associated with the technique of sintering compacting.And the filter that sintering preparation forms often forms certain pore-size distribution gradient at thickness direction, be conducive to filtrate to be carried out the filtration of multi-level different stage.
The filter type of filtration members comprises following several: 1) physics dams.This kind of mode is mainly to utilize network-like through hole in film to reach the object of the solid particle that dams.Network-like through hole is isotropic three-D space structure, and its micropore is staggered up and down, and effective diameter is reduced; On the other hand, the less part of through-hole aperture is all between particle, and this part of pore size has determined to filter the precision that can reach substantially.2) suction type.Because the particle diameter of UHMWPE powder is less, and most of particle has kept original shape substantially when sinter molding, so the UHMWPE particle in filtration membrane also has larger specific area, and the impurity being filtered in medium is had to certain suction-operated.3) stop up and dam.Impurity in filter medium or microorganism are when being adsorbed to UHMWPE surface, and a part of particle has also played ponding to the network-like through hole in film.This obstruction has just reduced the effective aperture of fenestra, rather than hole is blocked completely.Bottleneck portion is the key point of damming, and the obstruction of the bottleneck portion of through hole is especially crucial.This obstruction can improve the filtering accuracy of microfiltration membranes to a certain extent.The filtration members of the present invention filtration of water or other medium is realized by above several modes.
The present invention, in conjunction with physics, the chemical feature of UHMWPE powder, carries out initiative technological improvement to existing particle sintering method, and material formula and mould by designed, designed, formed corresponding processing technology.Variation due to material formula, the variation of mould and according to test experience accumulation, the present invention proposes different process, comprise corresponding temperature, pressure limit, not only shorten the time of processing, and can obtain as required stable performance, the good filtration members of filter effect, in process of the test, designed especially mould, can form the filter element of hollow one, be conducive to the application of this technology.
Summary of the invention
The sintering process that the object of the invention is to pass through and the mould of design form efficient, practical ultra-high molecular weight polyethylene filtration members.
The present invention proposes a kind of preparation method of hollow filtering member, described hollow filtering member is cuboid, and middle part has engraved structure; The gross thickness of described hollow filtering member is 6mm, and long is 300-360mm, and wide is 200-220mm, and wherein the thickness of openwork part is 2mm, and long is 300-360mm, and wide is 180-200mm; Described preparation method comprises the following steps:
Step 1: using ultra-high molecular weight polyethylene powder as matrix material, be mixed to get filtration members material with auxiliary material, insert in the mould of design;
Step 2: heat, pressurize inserting the mould of the described design after filtration members material, its process for to be warmed up to 70 ~ 120 ℃ by mould under 0.5 ~ 5MPa pressure, and 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; Mold cools down to 70 ℃ is following and keep 5 ~ 30min;
Step 3: the demoulding forms described hollow filtering member.
Wherein, before described step 1, to described mould, adopt Teflon to carry out surface treatment.
Wherein, the viscosity average molecular weigh of described ultra-high molecular weight polyethylene powder is 6,000,000 ~ 1,000 ten thousand, and average grain diameter is 20 ~ 300um.
Wherein, described auxiliary material can be one or more in following material: powdery high density polyethylene (HDPE), and addition is 5% ~ 15%; Powdery low density polyethylene (LDPE), addition is 3% ~ 5%; Other functional additive, comprises hydrophilizing agent, pore-foaming agent, activator, antioxidant, and addition is 0.5% ~ 10%; Activated carbon, addition is 5% ~ 10%; Carbon black, addition is 1% ~ 5%; Calcium carbonate, addition is 1% ~ 10%; Polyethylene glycol oxide, addition is 5% ~ 10%; Sodium chloride, addition is 0.5% ~ 3%; Wherein, described addition is auxiliary material shared ratio in described filtration members material.
Wherein, described ultra-high molecular weight polyethylene powder at least accounts for 85% of described filtration members material as matrix material; Auxiliary material accounts for 15% of described filtration members material at the most.
Wherein, the mould of described design comprises patrix, middle mould, counterdie and dividing plate; Described upper die and lower die structure is identical; Described upper die and lower die are two flat boards, and described middle mould has certain space between described upper die and lower die; Described middle mould is the bottomless cuboid of uncovered, and the middle part, edge of described middle mould is provided with strip perforate; Described perforate interpolation has described dividing plate; Described dividing plate is dull and stereotyped, its smooth surface or there is waveform or decorative pattern shape, and thickness is 0.5 ~ 60mm, length and width is respectively 8 ~ 900mm.
Wherein, in described step 2 heating, pressurization process be, 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; Mold cools down to 70 ℃ is following and keep 5 ~ 30min.
Wherein, the process of heating in described step 2, pressurization realizes by press or compression molding machine equipment.
Wherein, described mould is carried out to surface treatment.Described surface-treated method can be conveniently stripped, such as passing through, at die surface, applies Teflon material etc.
The invention allows for a kind of hollow filtering member prepared according to the methods of the invention, it comprises: ultra-high molecular weight polyethylene powder at least accounts for 85% of described filtration members material as matrix material; Auxiliary material accounts for 15% of described filtration members material at the most.
Wherein, described hollow filtering member is cuboid, and middle part has engraved structure.
Wherein, the thickness of described hollow filtering 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, according to the variation of the variation of the material formula of filtration members material, mould, has adopted different process.Constantly shorten the time of processing, and can obtain stable performance, the good filtration members of filter effect.
Accompanying drawing explanation
Fig. 1 is hollow filtering member preparation method's of the present invention schematic flow sheet.
Fig. 2 is hollow filtering member schematic diagram prepared by the present invention.Wherein, the front view that Fig. 2 A is, Fig. 2 B is top view.
Fig. 3 is the schematic diagram of 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 top view of patrix or counterdie.
Fig. 4 is the middle mould schematic diagram of preparation method's mould therefor of the present invention.Wherein, Fig. 4 A is front view, and Fig. 4 B is top view.
Fig. 5 is the schematic diagram of preparation method of the present invention dividing plate used.
Fig. 6 is the middle mould schematic diagram that is inserted with dividing plate in preparation method of the present invention.
The specific embodiment
In conjunction with following specific embodiments and the drawings, the present invention is described in further detail, and protection content of the present invention is not limited to following examples.Do not deviating under the spirit and scope of inventive concept, variation and advantage that those skilled in the art can expect are all included in the present invention, and take appending claims as protection domain.
In Fig. 1-3,1-engraved structure, 2-handle, 3-perforate, 4-patrix, mould in 5-, 6-counterdie, 7-hollow filtering member, 8-dividing plate 8.
As shown in Figure 1, the preparation method of a kind of hollow filtering member of the present invention comprises:
Step 1: using ultra-high molecular weight polyethylene powder as matrix material, be mixed to get filtration members material with auxiliary material, insert in the mould of design;
Step 2: heat, pressurize inserting the mould of the described design after filtration members material;
Step 3: the demoulding forms described hollow filtering member.
The preparation method of Novel hollow filtration members of the present invention, adopts ultra-high molecular weight polyethylene powder as matrix material, is inserted in the mould of design, and the process by heating, pressurization, forms hollow filtering 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, at least accounts for 85% of filtration members material.Auxiliary material can be one or more in following material: powdery high density polyethylene (HDPE), and addition is 5% ~ 15%; Powdery low density polyethylene (LDPE), addition is 3% ~ 5%; Other functional additive, comprises hydrophilizing agent, pore-foaming agent, activator, antioxidant etc., and addition is 0.5% ~ 10%.As activated carbon, addition is 5% ~ 10%; Carbon black, addition is 1% ~ 5%; Calcium carbonate, addition is 1% ~ 10%; Polyethylene glycol oxide, addition is 5% ~ 10%; Sodium chloride, addition is 0.5% ~ 3%.
For realizing the mould of the inventive method design, comprise patrix 4, middle mould 5, counterdie 6, as shown in Figure 3-4, patrix 4, counterdie 6 structures are identical, only show a patrix or counterdie in Fig. 3.Patrix 4 or counterdie 6 consist of flat board, and both sides are respectively 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, in perforate 3, be inserted with dividing plate 8, the effect of dividing plate 8 is hollow structures of realizing filtration members, dividing plate 8 is ganoid flat board or the 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, its optimized dimensions: thickness 0.5 ~ 60mm, length and width is 8 ~ 900mm.
The step of filling filtration members material of the present invention is: first at the inner surface of patrix 4, middle mould 5, counterdie 6, on the surface of dividing plate 8, be coated with one deck Teflon material, by counterdie 6 be placed on bottom, in mould 5 be arranged on counterdie 6, be positioned at the middle part of counterdie 6.Again the filtration members material mixing is packed in the formingspace of middle mould 5, when filtration members material is filled to perforate 3 place of middle mould 5, mould 5 during dividing plate 8 is inserted by perforate 3, and by the perforate 3 of the other end, stretch out fixing rear continuation and fill filtration members material, until middle mould 5 is filled up.Finally patrix 4 is fastened on to the top of middle mould 5, completes the filling of filtration members material.
Fill the processing method of in filtration members 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 process, and also can adopt material that other and Teflon have same effect as coating material.Teflon material also can only be coated in the surface contacting with finished product.
The heating of the inventive method, pressurization detailed process are: first the mould that installs 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 rear adjustment mould, continues to be warmed up to 140 ~ 210 ℃, and the time of staying is 3 ~ 60min; After be cooled to 70 ℃ following and keep 5 ~ 30min, the demoulding obtains hollow filter assemblies.Heating, pressuring method can be realized by press, vulcanizing press or other equipment that can heat, pressurize simultaneously.
As shown in Figure 2, the hollow filtering member that the inventive method preparation forms is cuboid, the size of hollow filtering member 7 can design as required, its optimized dimensions: gross thickness is 1.5 ~ 100mm, length and width is 10 ~ 1000mm, wherein the thickness of openwork part is 0.5 ~ 60mm, and length and width is 8 ~ 900mm.
embodiment 1
First at the inner surface of patrix 4, middle mould 5, counterdie 6, on the surface of dividing plate 8, be coated with one deck Teflon material.Counterdie 6 is placed on to bottom, middle mould 5 is arranged on counterdie 6, agree with mutually with counterdie 6.By the viscosity average molecular weigh of certain mass, be 6,000,000 again, average grain diameter is that the ultra-high molecular weight polyethylene of 150um packs in the formingspace of middle mould 5, when ultra-high molecular weight polyethylene is filled to perforate 3 place of middle mould 5, mould 5 during dividing plate 8 is inserted by perforate 3, and by the perforate 3 of the other end, stretch out fixing rear continuation and fill, until middle mould 5 is filled up.Finally patrix 4 is fastened on to the top of middle mould 5, completes filling.
Then whole mould is warmed up to 100 ℃ under 3MPa pressure, the time of staying is 15min; The pressure of rear adjustment mould, to 0.5MPa, continues to be warmed up to 150 ℃, and the time of staying is 15min; After be cooled to 40 ℃ and keep 20min, the demoulding obtains hollow filtering member.The gross thickness of hollow filtering 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.
embodiment 2
First at the inner surface of patrix 4, middle mould 5, counterdie 6, on the outer surface of dividing plate 8, be coated with one deck Teflon material.Counterdie 6 is placed on to bottom, middle mould 5 is arranged on counterdie 6, agree with mutually with counterdie 6.By the viscosity average molecular weigh of certain mass, be 3,500,000 again, average grain diameter is in the formingspace that packs middle mould 5 into of ultra-high molecular weight polyethylene of 250um, when ultra-high molecular weight polyethylene is filled to perforate 3 place of middle mould 5, mould 5 during dividing plate 8 is inserted by perforate 3, and by the perforate 3 of the other end, stretch out fixing rear continuation and fill, until middle mould 5 is filled up.Finally patrix 4 is fastened on to the top of middle mould 5, completes filling.
Then whole mould is warmed up to 110 ℃ under 2MPa pressure, the time of staying is 20min; The pressure of rear adjustment mould, to 0.5MPa, continues to be warmed up to 150 ℃, and the time of staying is 20min; After be cooled to 40 ℃ and keep 20min, the demoulding obtains hollow filtering member.The gross thickness of hollow filtering 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.
embodiment 3
First at the inner surface of patrix 4, middle mould 5, counterdie 6, on the outer surface of dividing plate 8, be coated with one deck Teflon material.Counterdie 6 is placed on to bottom, middle mould 5 is arranged on counterdie 6, agree with mutually with counterdie 6.By the viscosity average molecular weigh of certain mass, be 3,500,000 again, average grain diameter is in the formingspace that packs middle mould 5 into of ultra-high molecular weight polyethylene of 30um, when ultra-high molecular weight polyethylene is filled to perforate 3 place of middle mould 5, mould 5 during dividing plate 8 is inserted by perforate 3, and by the perforate 3 of the other end, stretch out fixing rear continuation and fill, until middle mould 5 is filled up.Finally patrix 4 is fastened on to the top of middle mould 5, completes filling.
Then whole mould is warmed up to 80 ℃ under 2MPa pressure, the time of staying is 10min; The pressure of rear adjustment mould, to 0.3MPa, continues to be warmed up to 140 ℃, and the time of staying is 10min; After be cooled to 40 ℃ and keep 20min, the demoulding obtains hollow filter assemblies.The gross thickness of hollow filtering 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.
embodiment 4
First at the inner surface of patrix 4, middle mould 5, counterdie 6, on the outer surface of dividing plate 8, be coated with one deck Teflon material.Counterdie 6 is placed on to bottom, middle mould 5 is arranged on counterdie 6, agree with mutually with counterdie 6.By the viscosity average molecular weigh of certain mass, be 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, when filtration members material is filled to perforate 3 place of middle mould 5, mould 5 during dividing plate 8 is inserted by perforate 3, and by the perforate 3 of the other end, stretch out fixing rear continuation and fill, until middle mould 5 is filled up.Finally patrix 4 is fastened on to the top of middle mould 5, completes filling.
Then whole mould is warmed up to 90 ℃ under 3MPa pressure, the time of staying is 15min; The pressure of rear adjustment mould, to 0.3MPa, continues to be warmed up to 140 ℃, and the time of staying is 10min; After be cooled to 40 ℃ and keep 20min, the demoulding obtains hollow filter assemblies.The gross thickness of hollow filtering 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.
embodiment 5
First at the inner surface of patrix 4, middle mould 5, counterdie 6, on the outer surface of dividing plate 8, be coated with one deck Teflon material.Counterdie 6 is placed on to bottom, middle mould 5 is arranged on counterdie 6, agree with mutually with counterdie 6.By the viscosity average molecular weigh of certain mass, be 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, when filtration members material is filled to perforate 3 place of middle mould 5, mould 5 during dividing plate 8 is inserted by perforate 3, and by the perforate 3 of the other end, stretch out fixing rear continuation and fill, until middle mould 5 is filled up.Finally patrix 4 is fastened on to the top of middle mould 5, completes filling.
Then whole mould is warmed up to 95 ℃ under 2MPa pressure, the time of staying is 20min; The pressure of rear adjustment mould, to 0.3MPa, continues to be warmed up to 145 ℃, and the time of staying is 15min; After be cooled to 40 ℃ and keep 20min, the demoulding obtains hollow filter assemblies.The gross thickness of hollow filtering 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.
embodiment 6
First at the inner surface of patrix 4, middle mould 5, counterdie 6, on the outer surface of dividing plate 8, be coated with one deck Teflon material.Counterdie 6 is placed on to bottom, middle mould 5 is arranged on counterdie 6, agree with mutually with counterdie 6.By the viscosity average molecular weigh of certain mass, be 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, when filtration members material is filled to perforate 3 place of middle mould 5, mould 5 during dividing plate 8 is inserted by perforate 3, and by the perforate 3 of the other end, stretch out fixing rear continuation and fill, until middle mould 5 is filled up.Finally patrix 4 is fastened on to the top of middle mould 5, completes filling.
Then whole mould is warmed up to 80 ℃ under 2MPa pressure, the time of staying is 20min; The pressure of rear adjustment mould, to 0.3MPa, continues to be warmed up to 150 ℃, and the time of staying is 10min; After be cooled to 40 ℃ and keep 20min, the demoulding obtains hollow filter assemblies.The gross thickness of hollow filtering 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 (2)
1. a preparation method for hollow filtering member, described hollow filtering member (7) is cuboid, middle part has engraved structure (1); The gross thickness of described hollow filtering member (7) is 6mm, and long is 300-360mm, and wide is 200-220mm, and wherein the thickness of openwork part is 2mm, and long is 300-360mm, and wide is 180-200mm; Described preparation method comprises the following steps:
Step 1: using ultra-high molecular weight polyethylene powder as matrix material, be mixed to get filtration members material with auxiliary material, insert in the mould of design;
Step 2: heat, pressurize inserting the mould of the described design after filtration members material, its process for to be warmed up to 70 ~ 120 ℃ by mould under 0.5 ~ 5MPa pressure, and 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; Mold cools down to 70 ℃ is following and keep 5 ~ 30min;
Step 3: the demoulding forms described hollow filtering member (7);
Wherein, before described step 1, to described mould, adopt Teflon to carry out surface treatment;
Wherein, described mould comprises patrix (4), middle mould (5), counterdie (6), dividing plate (8); Described patrix (4), counterdie (6) structure are identical; Described patrix (4), counterdie (6) are two flat boards, and described middle mould (5) has certain space between described patrix (4), counterdie between (6); Described middle mould (5) is the bottomless cuboid of uncovered, and the middle part, edge of described middle mould (5) is provided with strip perforate (3); Described perforate (3) interpolation has described dividing plate (8); Described dividing plate (8) is dull and stereotyped, described dividing plate (8) smooth surface, and thickness is 0.5 ~ 60mm, length and width is respectively 8 ~ 900mm;
Wherein, the viscosity average molecular weigh of described ultra-high molecular weight polyethylene powder is 6,000,000 ~ 1,000 ten thousand, and average grain diameter is 20 ~ 300um;
Wherein, described auxiliary material is one or more in following material: powdery high density polyethylene (HDPE), and addition is 5% ~ 15%; Powdery low density polyethylene (LDPE), addition is 3% ~ 5%; Functional additive, comprises hydrophilizing agent, pore-foaming agent, activator, antioxidant, and addition is 0.5% ~ 10%; Activated carbon, addition is 5% ~ 10%; Carbon black, addition is 1% ~ 5%; Calcium carbonate, addition is 1% ~ 10%; Polyethylene glycol oxide, addition is 5% ~ 10%; Sodium chloride, addition is 0.5% ~ 3%; Wherein, described addition is auxiliary material shared ratio in described filtration members material;
Wherein, described ultra-high molecular weight polyethylene powder at least accounts for 85% of described filtration members material as matrix material; Auxiliary material accounts for 15% of described filtration members material at the most.
2. the preparation method of hollow filtering member as claimed in claim 1, is characterized in that, the process of heating in described step 2, pressurization realizes by press or compression molding machine equipment.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110332589.1A CN102501366B (en) | 2011-10-28 | 2011-10-28 | Preparation method of hollow filtering member and product thereof |
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| CN201110332589.1A CN102501366B (en) | 2011-10-28 | 2011-10-28 | Preparation method of hollow filtering member and product thereof |
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| CN102501366A CN102501366A (en) | 2012-06-20 |
| CN102501366B true CN102501366B (en) | 2014-10-22 |
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| CN104492280B (en) * | 2014-12-22 | 2016-08-24 | 萍乡市普天高科实业有限公司 | A kind of composite membrane filter tube and preparation method thereof |
| 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 |
| CN105820416A (en) * | 2016-04-29 | 2016-08-03 | 秦诗发 | 3D sintering anti-static flame retardant air-liquid filter plate |
| 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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| CN1070363A (en) * | 1991-09-07 | 1993-03-31 | 王岐风 | The production method of plastic sense optical cement cylindrical filter cartridge |
| EP1803493B1 (en) * | 2005-12-22 | 2009-10-14 | Infiltec GmbH | Method for manufacturing filters |
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| CN102501366A (en) | 2012-06-20 |
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