CN106693517A - Preparation method of flame-resistant membrane-laminating filtering material capable of being cured at room temperature and repeatedly utilized - Google Patents
Preparation method of flame-resistant membrane-laminating filtering material capable of being cured at room temperature and repeatedly utilized Download PDFInfo
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- CN106693517A CN106693517A CN201610657745.4A CN201610657745A CN106693517A CN 106693517 A CN106693517 A CN 106693517A CN 201610657745 A CN201610657745 A CN 201610657745A CN 106693517 A CN106693517 A CN 106693517A
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- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/02—Types of fibres, filaments or particles, self-supporting or supported materials
- B01D2239/0208—Single-component fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/02—Types of fibres, filaments or particles, self-supporting or supported materials
- B01D2239/0216—Bicomponent or multicomponent fibres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
- B01D2239/065—More than one layer present in the filtering material
- B01D2239/0681—The layers being joined by gluing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/10—Filtering material manufacturing
Abstract
The invention discloses a preparation method of a flame-resistant membrane-laminating filtering material capable of being cured at room temperature and repeatedly utilized. The preparation method comprises the following steps: I, preparing an e-PTFE membrane: firstly preparing a PTFE base band, then performing longitudinal stretching and lateral stretching, and then performing lateral stretching on a longitudinal drawn membrane so as to obtain the e-PTFE membrane; and II, performing a membrane laminating technology: preparing an adhesive mixture, loading the PTFE membrane and a high-air-permeability flame-resistant base material into an unreeling device, enabling the PTFE membrane and the high-air-permeability flame-resistant base material to be bonded together through the atomizing spraying of the adhesive mixture and the surface press fitting of rollers so as to obtain the membrane-laminating filtering material, shifting the membrane-laminating filtering material into a warehouse, and performing curing at the room temperature so as to obtain finished products. According to the preparation method of the flame-resistant membrane-laminating filtering material capable of being cured at room temperature and repeatedly utilized, provided by the invention, the resistance added value produced in the preparation process is low, the flame-resistant properties of the prepared membrane-laminating filtering material are excellent, the membrane-laminating preparation process can be completed under the condition of room temperature, the preparation method is simple and easy to operate, equipment requirements are low, the production cost is low, and the preparation method has favorable economic benefits.
Description
Technical field
Repeated using the preparation method of fire-retardant coated filter material the present invention relates to a kind of cold curing, belong to coated filter material system
Standby technical field.
Background technology
Polytetrafluoroethylene (PTFE) (PTFE) has the superiority such as high chemical stability, resistant of high or low temperature, high flame retardant, low-surface-energy
Can, its powder by extrusion, calendering, the varicosity PTFE film for preparing of operation such as stretch there is good gas permeability and fire-retardant
Property, filter efficiency is high, is a kind of preferable surface filtering material.But PTFE film is thick very thin, generally require by and fid
Used after material is laminating, but due to PTFE poor mechanical properties in itself, cleaning process easily produces breakage, it is difficult to realize recycling.
At present, anti-flammability coated filter material field is the resistance of the highly-breathables such as glass fibre, aramid fiber from most fire-retardant backing materials
Combustible material, it can usually be related to including high temperature processes with the laminating technique of PTFE film.(patent No. CN202136878) inventor will
Fiberglass substrate impregnates PTFE emulsion, and laminating, PTFE emulsion infiltration part PTFE film hole, by burning then is carried out with PTFE film
PTFE film is adhered to fiberglass substrate surface by knot treatment.(application number CN201010544773.8) inventor is by glass
Fibrous substrate surface sprays the tetrafluoroethene emulsion containing initiator and is pressed with PTFE film, penetrates into tetrafluoroethene emulsion
Part PTFE film hole, triggers tetrafluoroethylene polymerization to realize that PTFE film is laminating with PTFE Nomex base materials using hot pressing mode, triggers
Temperature is 150-300 DEG C.(application number CN201010601270.X) inventor realizes PTFE film and fid using phase inversion
The bonding of material, liquid containing polymeric casting film is coated by backing material, PTFE film then is compounded in into backing material surface and is obtained
Primary membrane, is immersed in split-phase solidification and 40-80 DEG C of water soaking and washing in the coagulation bath containing organic solvent successively, is related to heating
Link and various organic solvents, formula and complex process.(application number CN97198428.X) inventor selects core-skin silk fiber
PTFE film and fire-retardant ventilative backing material are bonded by the thermosol of structure, and heat bonding process needs high temperature, and technique will
Ask high, resistance value added higher is easily produced, while strict to raw material and equipment requirement.Above-mentioned overlay film preparation technology is all referred to
To high temperature or heating process, complex process, operation requires high, and preparation process resistance value added is difficult to control, often higher, this
Outward, PTFE film mechanical property is not strengthened, and substantially reduces the possibility of coated filter material recycling, is unfavorable for that industrialization is pushed away
Extensively.
The content of the invention
The technical problems to be solved by the invention are the defects for overcoming prior art, there is provided a kind of repeatable profit of cold curing
With the preparation method of fire-retardant coated filter material, overlay film preparation process is completed at ambient temperature, simple to operation, equipment requirement and life
Low cost is produced, the resistance value added that preparation process is produced is low, the coated filter material excellent fireproof performance of preparation；Further, there is provided
A kind of cold curing is repeated using the preparation method of fire-retardant coated filter material, and the coated filter material of preparation can be cleaned repeatedly, repeats profit
With.
In order to solve the above technical problems, the present invention provides a kind of cold curing repeating using the preparation of fire-retardant coated filter material
Method, comprises the following steps：
First, the preparation of varicosity PTFE film
S1, prepares PTFE base band：By mass percent for the auxiliary agent oil of 20-30% is well mixed with PTFE resin powder,
Be placed on 45-55 DEG C of baking oven cure 20 hours or more it is rear it is pre- be pressed into column material embryo, obtain rod embryo by extrusion, put it into pressure
Prolong machine and obtain the PTFE base band that thickness is 100-300 μm, it is standby after dry abjection auxiliary agent oil；
S2, longitudinal stretching：Above-mentioned dried PTFE base band is carried out into multiple longitudinal stretching and obtains vertical membrane；
S3, cross directional stretch：Above-mentioned vertical membrane is carried out into cross directional stretch, sizing is sintered in horizontal drawing equipment end, obtained
Varicosity PTFE film；
2nd, coating technique
S4, gluing agent composition is prepared：Organophosphorus ester based flame retardant is mixed with monocomponent room-temperature cured type adhesive
Uniformly, and be transferred to glue cover machine storage glue tank；
S5, laminating technique：PTFE film and highly-breathable ignition resistant substrate are loaded into unwinding device, by gluing agent composition mist
Change spraying, roller surface pressing and PTFE film and highly-breathable ignition resistant substrate bonding integrally, are obtained into coated filter material；
S6, cold curing：The coated filter material prepared in step S5 is transferred to warehouse, cold curing 24-48h.
Longitudinal drawing temperature described in step S2 is 250-350 DEG C, and the total multiplying power of longitudinal stretching is 4-8 times, and at least one times
Longitudinal stretching more than 327 DEG C.
Transverse drawing temperature described in step S3 is 300-360 DEG C, and cross directional stretch multiplying power is 8-15 times, and sintering temperature exists
360-400℃。
Organophosphorus ester based flame retardant described in step S4 is 5 with the mass ratio of monocomponent room-temperature cured type adhesive:
100-30:100。
The adhesive include adhesive for polyurethane, silicone adhesive in one or two.
The setting quantity for spray of atomizing spraying described in step S5 is 6-15g/m2, the laminating speed of disk roller is 8-18m/min, is covered
Resultant pressure is 0.05-0.3MPa.
The highly-breathable ignition resistant substrate includes that glass fibre, polyimide fiber, aramid fiber, carbon fiber, metal are fine
One or more in dimension, silica fibre, flame-retardant modified polyester fiber.
The form of the highly-breathable ignition resistant substrate include Nomex, woven fabric, melt-spun cloth, spun lacing material in one kind or
It is various.
The beneficial effect that the present invention is reached：
Coating technique of the invention is pressed PTFE using room temperature curing type gluing agent composition atomizing spraying, roller surface
Film and highly-breathable ignition resistant substrate bonding are integral, obtain coated filter material, realize completion under overlay film preparation process room temperature condition,
It is simple to operation, equipment requirement and low production cost, obtained coated filter material excellent fireproof performance, it is impossible to lighted with naked light, from
Fiery self-extinguishment at once；
Gluing agent composition uses atomizing spraying, and applying glue is uniform, and control is accurate, only needs a small amount of glue to obtain coated filter material
It is mainly distributed in the hole of highly-breathable ignition resistant substrate enough to cohesive force, and gluing agent composition, and stays in PTFE film
Seldom, the resistance value added that preparation technology is produced is no more than the 5% of materials at two layers resistance summation to amount in hole；
Further, the longitudinal stretching ring of fusing point (327 DEG C) temperatures above is increased in the preparation technology of varicosity PTFE film
Sintering temperature is saved and improves, the PTFE film fiber and node crystal structure of acquisition are more perfect, and excellent in mechanical performance is not fragile
Damage, easy cleaning, by compressed air blowback or washing, the filtering material resistance value added after cleaning is no more than last using just
The 2% of beginning Resistance Value, efficiency value is not reduced.
Therefore, a kind of cold curing provided by the present invention is repeated using the preparation method of fire-retardant coated filter material, is prepared
The resistance value added that process is produced is low, and the coated filter material excellent fireproof performance of preparation, overlay film preparation process is complete at ambient temperature
Into simple to operation, equipment requirement and low production cost, with good economic benefit and social benefit.
Brief description of the drawings
Fig. 1 is coated filter material structural representation；
Fig. 2 is the DSC curve of the vertical membranes of PTFE；
Fig. 3 is the DSC curve of varicosity PTFE film.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following examples are only used for clearly illustrating the present invention
Technical scheme, and can not be limited the scope of the invention with this.
Embodiment 1
A kind of cold curing of the present embodiment is repeated using the preparation method of fire-retardant coated filter material, is comprised the following steps：
1) prepared by varicosity PTFE film：The auxiliary agent oil that mass percent is 25% is well mixed with PTFE resin powder, is put
Put and cured 20 hours in 45 DEG C of baking ovens, the PTFE base band that thickness is 200 μm is obtained by precompressed, extrusion, calendering, dry abjection and help
Longitudinal stretching twice is carried out after agent oil, draft temperature is respectively 250 DEG C and 340 DEG C, and single stretching ratio is 2 times, so as to obtain
Crystal structure more perfect membrane fiber and node are obtained, vertical membrane mechanical property is substantially increased, there is 380 on its DSC curve
DEG C melting peak (as shown in Figure 2)；
Vertical membrane is then carried out into cross directional stretch, draft temperature is 330 DEG C, and stretching ratio is 10 times, finally at 380 DEG C
It is sintered sizing and obtains varicosity PTFE film, membrane fiber and node crystal structure is perfect, there are 380 DEG C or so melting peak (such as Fig. 3
It is shown), film dynamic performance is excellent, not cracky, as surface filtering material, repeats and utilizes.Test performance parameter is listed in attached
Table 1.
2) prepared by coated filter material：Organophosphorus ester based flame retardant and single-component moisture curing polyurethane adhesive are pressed 5:100
Mass ratio it is well mixed after be transferred to glue and cover machine storage glue tank.The PTFE film of above-mentioned preparation and fiberglass substrate are loaded and is unreeled
Device, setting quantity for spray is 6g/m2, laminating speed be 15m/min, laminating pressure be 0.1MPa, by gluing agent composition mist
Change spraying, press PTFE film and fiberglass substrate bonding integrally, obtain coated filter material and be transferred to warehouse, cold curing
24h, is obtained cold curing and repeats using fire-retardant coated filter material as shown in figure 1, test performance parameter is listed in subordinate list 1.
Embodiment 2
A kind of cold curing of the present embodiment is repeated using the preparation method of fire-retardant coated filter material, is comprised the following steps：
1) prepared by varicosity PTFE film：The auxiliary agent oil that mass percent is 20% is well mixed with PTFE resin powder, is put
Put and cured 24 hours in 50 DEG C of baking ovens, the PTFE base band that thickness is 300 μm is obtained by precompressed, extrusion, calendering, dry abjection and help
Longitudinal stretching twice is carried out after agent oil, draft temperature is respectively 280 DEG C and 350 DEG C, and single stretching ratio is 2 times.Then will
Vertical membrane carries out cross directional stretch, and draft temperature is 320 DEG C, and stretching ratio is 8 times, is finally sintered sizing at 360 DEG C and obtains
Varicosity PTFE film is obtained, test performance parameter is listed in subordinate list 1.
It is prepared by coated filter material：Organophosphorus ester based flame retardant and single-component moisture curing polyurethane adhesive are pressed 10:100
Glue is transferred to after mass ratio is well mixed and covers machine storage glue tank.Then the PTFE film of above-mentioned preparation and aramid fiber base material are loaded and is put
Winding apparatus, setting quantity for spray is 12g/m2, laminating speed be 18m/min, laminating pressure be 0.05MPa, by adhesive mix
Thing atomizing spraying, pressing are integral by PTFE film and aramid fiber substrate bonding, obtain coated filter material and are transferred to warehouse, room temperature
Solidification 36h, is obtained cold curing and repeats using fire-retardant coated filter material as shown in figure 1, test performance parameter is listed in subordinate list 1.
Embodiment 3
A kind of cold curing of the present embodiment is repeated using the preparation method of fire-retardant coated filter material, is comprised the following steps：
1) prepared by varicosity PTFE film：The auxiliary agent oil that mass percent is 28% is well mixed with PTFE resin powder, is put
Put and cured 24 hours in 55 DEG C of baking ovens, the PTFE base band that thickness is 150 μm is obtained by precompressed, extrusion, calendering, dry abjection and help
Longitudinal stretching twice is carried out after agent oil, draft temperature is respectively 320 DEG C and 350 DEG C, and single stretching ratio is respectively 2 times and 3 times.
Vertical membrane is then carried out into cross directional stretch, draft temperature is 360 DEG C, and stretching ratio is 15 times, is finally sintered at 400 DEG C
Sizing obtains varicosity PTFE film, and test performance parameter is listed in subordinate list 1.
2) prepared by coated filter material：Organophosphorus ester based flame retardant and monocomponent moisture cure silicone adhesive are pressed 30:100
Mass ratio it is well mixed after be transferred to glue and cover machine storage glue tank.Then by the PTFE film of above-mentioned preparation and polyimide fiber base material
Load unwinding device, setting quantity for spray is 10g/m2, laminating speed be 15m/min, laminating pressure be 0.3MPa, by adhesive
Mixture atomizing spraying, pressing are integral by PTFE film and polyimide fiber substrate bonding, obtain coated filter material and are transferred to
Warehouse, cold curing 48h is obtained cold curing and repeats using fire-retardant coated filter material as shown in figure 1, test performance parameter is listed in
Subordinate list 1.
Embodiment 4
A kind of cold curing of the present embodiment is repeated using the preparation method of fire-retardant coated filter material, is comprised the following steps：
1) prepared by varicosity PTFE film：The auxiliary agent oil that mass percent is 30% is well mixed with PTFE resin powder, is put
Put and cured 30 hours in 50 DEG C of baking ovens, the PTFE base band that thickness is 100 μm is obtained by precompressed, extrusion, calendering, dry abjection and help
Longitudinal stretching twice is carried out after agent oil, draft temperature is respectively 250 DEG C and 335 DEG C, and single stretching ratio is respectively 4 times and 2 times.
Vertical membrane is then carried out into cross directional stretch, draft temperature is 300 DEG C, and stretching ratio is 12 times, is finally sintered at 370 DEG C
Sizing obtains varicosity PTFE film, and test performance parameter is listed in subordinate list 1.
2) prepared by coated filter material：Organophosphorus ester based flame retardant and the glutinous agent of single-component moisture curing polyurethane are pressed 15:100
Mass ratio mixes, and glue is transferred to after standing 2 hours and covers machine storage glue tank.Then the PTFE film of above-mentioned preparation and carbon fiber base material are filled
Enter unwinding device, setting quantity for spray is 15g/m2, laminating speed be 8m/min, laminating pressure is 0.15MPa, mixed by adhesive
Compound atomizing spraying, pressing are integral by PTFE film and carbon fiber base material bonding, obtain coated filter material and are transferred to warehouse, room temperature
Solidification 30h, is obtained cold curing and repeats using fire-retardant coated filter material as shown in figure 1, test performance parameter is listed in subordinate list 1.
Varicosity PTFE film, coated filter material and ignition resistant substrate prepared by embodiment 1-4 carries out performance test, as a result such as table
Shown in 1：
The varicosity PTFE film of table 1, coated filter material and ignition resistant substrate performance comparison
As can be seen here, the coated filter material excellent fireproof performance that prepared by the present invention, repeats and utilizes, and meets national energy-saving low-carbon (LC)
Policy, helps to reduce the enterprise's production capacity in the fields such as metallurgy, thermal power generation, waste incineration, and application prospect is extensive；Prepare
Completed under process room temperature condition, simple to operation, equipment requirement and low production cost have greatly promoted industrialized production, pass through
Ji and social benefit are notable.
The method of testing that the present invention is used：
Thickness measuring：
CH-1-S type THICKNESS GAUGE FOR THE MEASUREMENT OF THIN FOILSs, determine PTFE film thickness.
Opening size test：
PTFE film aperture is determined by HY/T 039-1995 miillpore filter pore performances measuring method.
Drag efficiency is tested：
Drag efficiency tester, determines the resistance and efficiency of PTFE film and coated filter material under 5.3cm/s air velocitys, its
In, efficiency is the 0.2-0.3 μm of rejection of particle.
Anti-flammability is tested：
Coated filter material is put into be burned in flame and continues more than 10 seconds, is moved out flame, observes filtrate combustion case, sentences
Disconnected flame retardant effect.
DSC is tested：
Appropriate PTFE vertical membrane and horizontal membrane sample (5-10mg) are weighed, is carried out in differential scanning calorimeter (TA Q100)
Test, programming rate is 10 DEG C/min.
Coated filter material reuses experimental test:
Coated filter material is put into dust test platform, wind speed setting is 21.2cm/s, is tested using standard dust, when covering
When film filtering material resistance rises to 2 times of initial value, stop test.Using compressed air blowback or water-washing method to coated filter material surface
Cleaned, cleaning carries out drag efficiency test after finishing, and then repeats above-mentioned test.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, on the premise of the technology of the present invention principle is not departed from, some improvement and deformation can also be made, these improve and deform
Also should be regarded as protection scope of the present invention.
Claims (8)
1. a kind of cold curing is repeated using the preparation method of fire-retardant coated filter material, it is characterised in that comprised the following steps：
First, the preparation of varicosity PTFE film
S1, prepares PTFE base band：By mass percent for the auxiliary agent oil of 20-30% is well mixed with PTFE resin powder, it is placed on
45-55 DEG C of baking oven cure 20 hours or more it is rear it is pre- be pressed into column material embryo, obtain rod embryo by extrusion, put it into calender and obtain
It is standby after dry abjection auxiliary agent oil to the PTFE base band that thickness is 100-300 μm；
S2, longitudinal stretching：Above-mentioned dried PTFE base band is carried out into multiple longitudinal stretching and obtains vertical membrane；
S3, cross directional stretch：Above-mentioned vertical membrane is carried out into cross directional stretch, sizing is sintered in horizontal drawing equipment end, obtain varicosity
PTFE film；
2nd, coating technique
S4, gluing agent composition is prepared：Organophosphorus ester based flame retardant is well mixed with monocomponent room-temperature cured type adhesive,
And be transferred to glue cover machine storage glue tank；
S5, laminating technique：PTFE film and highly-breathable ignition resistant substrate are loaded into unwinding device, is atomized by gluing agent composition and sprayed
Apply, PTFE film and highly-breathable ignition resistant substrate bonding integrally, are obtained coated filter material by roller surface pressing；
S6, cold curing：The coated filter material prepared in step S5 is transferred to warehouse, cold curing 24-48h.
2. cold curing according to claim 1 is repeated using the preparation method of fire-retardant coated filter material, it is characterised in that
Longitudinal drawing temperature described in step S2 be 250-350 DEG C, the total multiplying power of longitudinal stretching be 4-8 times, and at least one times 327 DEG C with
On longitudinal stretching.
3. cold curing according to claim 1 is repeated using the preparation method of fire-retardant coated filter material, it is characterised in that
Transverse drawing temperature described in step S3 is 300-360 DEG C, and cross directional stretch multiplying power is 8-15 times, and sintering temperature is at 360-400 DEG C.
4. cold curing according to claim 1 is repeated using the preparation method of fire-retardant coated filter material, it is characterised in that
Organophosphorus ester based flame retardant described in step S4 is 5 with the mass ratio of monocomponent room-temperature cured type adhesive:100-30:100.
5. cold curing according to claim 1 is repeated using the preparation method of fire-retardant coated filter material, it is characterised in that
The adhesive include adhesive for polyurethane, silicone adhesive in one or two.
6. cold curing according to claim 1 is repeated using the preparation method of fire-retardant coated filter material, it is characterised in that
The setting quantity for spray of atomizing spraying described in step S5 is 6-15g/m2, the laminating speed of disk roller is 8-18m/min, and laminating pressure is
0.05-0.3MPa。
7. cold curing according to claim 1 is repeated using the preparation method of fire-retardant coated filter material, it is characterised in that
The highly-breathable ignition resistant substrate includes that glass fibre, polyimide fiber, aramid fiber, carbon fiber, metallic fiber, silica are fine
One or more in dimension, flame-retardant modified polyester fiber.
8. cold curing according to claim 1 is repeated using the preparation method of fire-retardant coated filter material, it is characterised in that
The form of the highly-breathable ignition resistant substrate includes one or more in Nomex, woven fabric, melt-spun cloth, spun lacing material.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610657745.4A CN106693517A (en) | 2016-08-12 | 2016-08-12 | Preparation method of flame-resistant membrane-laminating filtering material capable of being cured at room temperature and repeatedly utilized |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610657745.4A CN106693517A (en) | 2016-08-12 | 2016-08-12 | Preparation method of flame-resistant membrane-laminating filtering material capable of being cured at room temperature and repeatedly utilized |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109647054A (en) * | 2019-01-07 | 2019-04-19 | 浙江净膜环保有限责任公司 | Laminating base fabric filtrate |
| CN115253426A (en) * | 2022-08-17 | 2022-11-01 | 山东新华制药股份有限公司 | Waste water treatment device |
| CN115337694A (en) * | 2022-08-17 | 2022-11-15 | 山东新华制药股份有限公司 | Medicine stock solution filter equipment who contains fine particle |
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Application publication date: 20170524 |