CN111974087B - Novel rubber-coated filter cloth and production process thereof - Google Patents
Novel rubber-coated filter cloth and production process thereof Download PDFInfo
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- CN111974087B CN111974087B CN202010257196.8A CN202010257196A CN111974087B CN 111974087 B CN111974087 B CN 111974087B CN 202010257196 A CN202010257196 A CN 202010257196A CN 111974087 B CN111974087 B CN 111974087B
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- filter cloth
- rubber
- sealing
- mucilage
- vulcanization
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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
- B01D39/08—Filter cloth, i.e. woven, knitted or interlaced material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
- B01D25/12—Filter presses, i.e. of the plate or plate and frame type
- B01D25/21—Plate and frame presses
-
- 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
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/04—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam
- B29C35/049—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould using liquids, gas or steam using steam or damp
Abstract
The invention discloses a novel rubber-coated filter cloth which is characterized in that a flexible mucilage is coated at a press-fit part between the existing filter cloth and a plate frame or a filter plate, and then the flexible mucilage is crosslinked and vulcanized to form a sealing layer, so that the novel filter cloth bonded with a flexible sealing ring is obtained, and the problem of poor sealing of the filter cloth is solved; the production process comprises a mucilage manufacturing flow and a filter cloth treatment process, wherein the filter cloth treatment process comprises the steps of cleaning filter cloth, identifying a working surface, coating mucilage, vulcanizing at constant temperature and the like. Aiming at the defects of the sealing treatment process of the existing filter cloth, the rubber cement is hung on the pressing surface of the filter cloth, and a smoother and softer sealing ring layer is formed at the pressing part at the periphery of the filter cloth through a certain improved vulcanization process, and the sealing ring layer is uniform in vulcanization, high in smoothness, better in ageing resistance and higher in repeated use rate, so that the sealing degree of the pressing part of the filter cloth is greatly increased, and the problem of leakage of the filter cloth is thoroughly, effectively and permanently solved.
Description
Technical Field
The invention relates to the technical field of sealing treatment of filter cloth, in particular to a novel rubber-coated filter cloth and a production process thereof.
Background
In the use process of the filter cloth for the existing filter press, as the filter cloth is provided with a load, the filter cloth fiber net is easily stretched and deformed by the gravity of materials, so that the compression surface between the plate frame or the filter plate and the filter cloth is loosened, and a certain amount of seepage phenomenon can be caused due to the capillary phenomenon of fiber gaps, so that not only is the material loss caused, but also relatively fine material particles can reach the filtrate along with the seepage liquid, and the filtering failure is caused.
Aiming at the problem of the sealing property of the filter cloth, a sealing ring is arranged on a filter cloth pressing surface in a cushioning mode, and the method is high in cost and difficult to install; therefore, in some workshops, a certain effect is achieved by adopting a mode of curing after rubber liquid is used for dipping filter cloth (or bonding), but because the rubber liquid is selected by using a bonding agent or a vulcanization method used by a common sealing ring, the rubber is unevenly distributed on a filter cloth pressing surface, the pressing degrees of the pressing surfaces after fastening are inconsistent, the problem of leakage of the filter cloth is not completely solved, and further improvement is still needed.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a novel rubber-coated filter cloth and a production process thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a novel rubber coating filter cloth is characterized in that a flexible mortar is coated at a press-fit position between the existing filter cloth and a plate frame or a filter plate, and then cross-linked and vulcanized to form a sealing layer, so that the novel filter cloth bonded with a flexible sealing ring is obtained, and the problem of poor sealing of the filter cloth is solved.
In order to prepare the novel filter cloth, the invention also discloses a production process of the novel rubber-coated filter cloth, which comprises the following steps:
firstly, a mucilage manufacturing process:
mixing and stirring rubber and an auxiliary agent uniformly through a rubber mixing mill to prepare a rubber cement master batch, 2, mixing an organic solvent and the rubber cement master batch according to the weight ratio of 2-5: 1, mixing the components in a glass container, sealing and storing the components, standing the components for a certain time for later use, and periodically stirring the components in the period;
secondly, a filter cloth treatment process:
1) pretreating the filter cloth to ensure that the filter cloth is dry and clean;
2) marking the surface of the working ring;
3) uniformly spreading the mucilage obtained in the step one on the identification area;
4) and (3) putting the filter cloth in a constant temperature environment, and vulcanizing at constant temperature for 24 hours to obtain the novel rubber-coated filter cloth finished product.
Preferably, the rubber is one or more of natural rubber, nitrile rubber, butadiene rubber, styrene butadiene rubber and the like, and the main rubber material used in the invention is preferably high molecular rubber with large molecular weight, long main chain and short side chain, so as to promote the rubber molecules to be effectively hung on the mesh fibers of the filter cloth after being swelled in a solvent and stirred into slurry, and improve the caking property.
Preferably, the auxiliary agent is one or more of a sulfur accelerator, an anti-aging agent, a tackifier, a filler and the like, the formula of the rubber cement adopted by the invention is slightly different from that of the existing rubber sealing ring, various additives can be optionally added according to the sealing requirement of the filter cloth, so that the rubber cement forms a softer sealing layer after vulcanization, and the hardness of the existing rubber sealing ring has the industrial standard and shape limitation.
Preferably, the organic solvent is one or more of an alcohol solvent, a ketone solvent and an ester solvent, the solvent used in the invention is used for swelling the rubber aggregate and stirring the rubber aggregate into slurry, and the ratio of the organic solvent to the rubber slurry master batch is 2-5: the slurry with certain viscosity and fluidity can be obtained according to the proportion of 1, so that the slurry can be smoothly hung on the filter cloth, certain leveling property can be realized, a smoother sealing layer is convenient to form, the pressure of all the surrounding parts of the filter cloth is basically consistent when the filter cloth is compressed, and the leakage problem of the filter cloth is thoroughly solved.
Preferably, the constant-temperature vulcanization can adopt the existing vulcanization process, and the invention particularly adopts the vulcanization process at a lower temperature (lower than the water boiling point of 100 ℃) to ensure that the rubber cement is not only hung on the filter cloth, but also form a softer sealing ring layer, which is obviously different from the sealing of a harder sealing ring or a ring sheet in the prior art; the specific operation method comprises the following steps: coating the sizing area of the filter cloth with a vulcanizing agent aqueous solution, and then carrying out hot vulcanization at 20-100 ℃.
Furthermore, the range of the vulcanization temperature is further limited to 40-70 ℃, proper temperature rise is beneficial to improving proper vulcanization crosslinking, and the formation of a rubber ring with higher hardness due to over vulcanization is avoided, which is different from the mode of forming the rubber ring by hanging rubber emulsion and then curing in the prior art.
In addition, the invention also provides a novel vulcanization process, which avoids directly applying the vulcanization process of the existing rubber sealing ring to the mounting field of the sealing rubber layer of the filter cloth, and the specific operation method is as follows:
1) sealing and fumigating the mucilage-spread filter cloth by adopting a hydrogen sulfide generator connecting pipe, controlling the gas temperature in a fumigation chamber to be 50-70 ℃, and fumigating for 2-3 min;
2) taking out the fumigated filter cloth, spraying 20-30% hydrogen peroxide water solution, and reacting at normal temperature for 3-5 min;
3) heating and vulcanizing the reacted filter cloth in a sealed container by using water vapor, raising the temperature to 120-140 ℃, and vulcanizing for 1-2 h;
4) washing the vulcanized filter cloth for 2-3 times by using a 5-10% sodium hydroxide aqueous solution, then washing for 2-3 times by using pure water, and finally drying in vacuum at 60-70 ℃ and under the pressure of about 100-1000Pa to obtain the finished novel filter cloth bonded with the flexible sealing ring.
After the novel vulcanization process, the sulfur is generated by utilizing the field reaction of the hydrogen sulfide and the hydrogen peroxide, the field vulcanization is carried out on the rubber cement surface, so that the vulcanization degree of the slurry of each part is basically consistent, a compact soft rubber layer is formed on the surface, the rubber cement layer is difficult to fall off on the filter cloth, the waterproofness is high, and the moisture is difficult to permeate into the soft rubber layer, so that the stable soft elasticity is provided during sealing and pressing.
Compared with the prior art, the invention has the beneficial effects that:
aiming at the defects of the sealing treatment process of the existing filter cloth, the rubber cement is hung on the pressing surface of the filter cloth, and a smoother and softer sealing ring layer is formed at the pressing part at the periphery of the filter cloth through a certain improved vulcanization process, and the sealing ring layer is uniform in vulcanization, high in smoothness, better in ageing resistance and higher in repeated utilization rate, so that the sealing degree of the pressing part of the filter cloth is greatly increased, the leakage problem of the filter cloth is thoroughly, effectively and permanently solved, the obtained novel rubber-coated filter cloth can be used as a novel product, the tightness of the existing filter press part is improved, and the rubber cement is favorably applied to a high-tightness filter press system.
Drawings
Fig. 1 is a schematic diagram of a sizing process of a production process of a novel rubber-coated filter cloth provided by the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example 1:
firstly, a mucilage manufacturing process:
1kg of nitrile rubber, 2kg of butadiene rubber, 32g of sulfur accelerator, 51g of tackifier, 65g of filler rubber and auxiliary agent are mixed and stirred uniformly by a rubber mixing mill to prepare a rubber cement master batch; dissolving the above mucilage master batch into 8L mixed solvent of cyclohexanone and n-butanol (the volume ratio of cyclohexanone to n-butanol is 1: 1) in a glass container, sealing, storing for 3 days, periodically stirring once every 2 hours during the period, and controlling the stirring speed at about 50 r/min;
secondly, a filter cloth treatment process:
1) pretreating the filter cloth to ensure that the filter cloth is dry and clean;
2) marking the surface of the working ring;
3) uniformly spreading the mucilage obtained in the step one on the identification area;
4) and (3) putting the filter cloth in a constant temperature environment, uniformly coating or rolling and brushing a vulcanizing agent aqueous solution with the mass concentration of 18% on a sizing area of the filter cloth, and carrying out constant temperature hot vulcanization for 24 hours at the temperature of 60 ℃ to obtain the novel rubber-coated filter cloth finished product provided by the invention.
Example 2: the formula of the rubber cement which is completely the same as that of the embodiment 1 is adopted, the step of sizing the filter cloth is also completely the same as that of the embodiment 1, the only difference is that the novel vulcanization process provided by the invention is adopted, and the specific vulcanization process operation is as follows:
1) sealing and fumigating the mucilage-spread filter cloth by adopting a hydrogen sulfide generator connecting pipe, controlling the gas temperature in a fumigation chamber to be 63 ℃, and fumigating for 3 min;
2) taking out the fumigated filter cloth, spraying 25% hydrogen peroxide water solution, and reacting for 5min at normal temperature;
3) heating and vulcanizing the reacted filter cloth in a sealed container by using water vapor, raising the temperature to 130 ℃, and vulcanizing for 2 hours;
4) and (3) washing the vulcanized filter cloth for 2-3 times by using a 5-10% sodium hydroxide aqueous solution, then washing for 2-3 times by using pure water, and finally drying in vacuum at 65 ℃ and about 1000Pa under 100-fold pressure to obtain the finished novel filter cloth bonded with the flexible sealing ring.
And (3) sealing test: the gummed filter cloths obtained in example 1 and example 2 were each used in a plate-and-frame filter press of type XA (M) ZG200/1250-U, with a filter area of 80m at a working pressure of 20MPa2Total volume of 1.26m3The filter frame is used for carrying out filter pressing on various commonly used colloidal solutions and suspensions, particularly sludge of a sewage treatment plant, wherein the filter pressing frequency is about 20 times.
The results show that the gummed filter cloth obtained in the example 1 and the example 2 has no leakage phenomenon, but the surface of the sealing ring is pressed flat along with a plate frame after the gummed filter cloth of the example 1 is used for 20 times, but the flatness of each place is not easy and has larger deformation, and the filter pressing is continued for 20 times, certain leakage exists in each place, but the leakage rate does not exceed 5%; the gummed filter cloth in the embodiment 2 basically ensures a planar state, and still has no obvious deformation after being continuously filter-pressed for 20-50 times, and the novel surface vulcanization process really improves the uniformity of rubber cement vulcanization and ensures that the sealing ring is leveled and uniform.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (7)
1. The production process of the rubberized filter cloth is characterized by comprising the following steps of:
firstly, a mucilage manufacturing process:
1) mixing and stirring rubber and an auxiliary agent uniformly through a rubber mixing machine to prepare a rubber cement master batch;
2) adopting an organic solvent and a mucilage master batch according to the weight ratio of 2-5: 1, mixing the components in a glass container, sealing and storing the components, standing the components for a certain time for later use, and periodically stirring the components in the period;
secondly, a filter cloth treatment process:
1) pretreating the filter cloth to ensure that the filter cloth is dry and clean;
2) marking the surface of the working ring;
3) uniformly spreading the mucilage obtained in the step one on the identification area;
4) putting the filter cloth in a constant temperature environment, and vulcanizing at constant temperature for 24h to obtain a finished product of the rubber-coated filter cloth;
the specific operation method of the constant temperature vulcanization in the second step is as follows:
1) sealing and fumigating the mucilage-spread filter cloth by adopting a hydrogen sulfide generator connecting pipe, controlling the gas temperature in a fumigation chamber to be 50-70 ℃, and fumigating for 2-3 min;
2) taking out the fumigated filter cloth, spraying 20-30% hydrogen peroxide water solution, and reacting at normal temperature for 3-5 min;
3) heating and vulcanizing the reacted filter cloth in a sealed container by using water vapor, raising the temperature to 120-140 ℃, and vulcanizing for 1-2 h;
4) washing the vulcanized filter cloth for 2-3 times by using a 5-10% sodium hydroxide aqueous solution, cleaning for 2-3 times by using pure water, and finally drying in vacuum at 60-70 ℃ and under the pressure of about 1000Pa under the pressure of 100-.
2. A process for producing a rubberized filter cloth according to claim 1, wherein said rubber is in particular one or more of natural rubber, nitrile rubber, butadiene rubber, styrene butadiene rubber.
3. A process for producing a rubberized filter cloth according to claim 1, wherein said auxiliary agent is in particular one or more of a sulfur accelerator, an anti-aging agent, a tackifier, a filler.
4. A process for producing a rubberized filter cloth according to claim 1, wherein said organic solvent is in particular one or more of an alcohol solvent, a ketone solvent, an ester solvent.
5. The production process of a rubberized filter cloth according to claim 1, wherein the specific operation method of constant temperature vulcanization in the second step is: coating the sizing area of the filter cloth with aqueous solution of vulcanizing agent, and then carrying out hot vulcanization at 20-100 ℃.
6. The production process of a rubberized filter cloth according to claim 5, wherein the specific operation method of constant temperature vulcanization in the second step is: coating the sizing area of the filter cloth with aqueous solution of vulcanizing agent, and then carrying out hot vulcanization at 40-70 ℃.
7. A rubber-coated filter cloth prepared according to claim 1, wherein a flexible rubber cement is coated on a press-fit part between the existing filter cloth and a plate frame or a filter plate, and then cross-linked and vulcanized to form a sealing layer, so that the filter cloth bonded with a flexible sealing ring is obtained, and the problem of poor sealing of the filter cloth is solved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010257196.8A CN111974087B (en) | 2020-04-03 | 2020-04-03 | Novel rubber-coated filter cloth and production process thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010257196.8A CN111974087B (en) | 2020-04-03 | 2020-04-03 | Novel rubber-coated filter cloth and production process thereof |
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| CN111974087A CN111974087A (en) | 2020-11-24 |
| CN111974087B true CN111974087B (en) | 2022-04-26 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB827362A (en) * | 1955-05-13 | 1960-02-03 | J B Broadley Ltd | A filter press cloth |
| CN2541026Y (en) * | 2002-04-19 | 2003-03-26 | 江苏苏东化工机械有限公司 | Press filter filtration fabric able to eliminate capillarity of filtration fabric |
| CN101745257A (en) * | 2008-12-08 | 2010-06-23 | 中国石油天然气股份有限公司 | Method for treating filter cloth of plate-and frame-filter press |
| CN104290342A (en) * | 2014-09-19 | 2015-01-21 | 明光瑞泰工业有限公司 | Process for producing a tire |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8366931B2 (en) * | 2010-06-17 | 2013-02-05 | New Century Membrane Technology Co., Ltd. | Filtering unit |
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2020
- 2020-04-03 CN CN202010257196.8A patent/CN111974087B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB827362A (en) * | 1955-05-13 | 1960-02-03 | J B Broadley Ltd | A filter press cloth |
| CN2541026Y (en) * | 2002-04-19 | 2003-03-26 | 江苏苏东化工机械有限公司 | Press filter filtration fabric able to eliminate capillarity of filtration fabric |
| CN101745257A (en) * | 2008-12-08 | 2010-06-23 | 中国石油天然气股份有限公司 | Method for treating filter cloth of plate-and frame-filter press |
| CN104290342A (en) * | 2014-09-19 | 2015-01-21 | 明光瑞泰工业有限公司 | Process for producing a tire |
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| CN111974087A (en) | 2020-11-24 |
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