CN106589723B - A essence filtration equipment for filtering feed liquid of medium temperature water-soluble membrane - Google Patents
A essence filtration equipment for filtering feed liquid of medium temperature water-soluble membrane Download PDFInfo
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- CN106589723B CN106589723B CN201611068499.5A CN201611068499A CN106589723B CN 106589723 B CN106589723 B CN 106589723B CN 201611068499 A CN201611068499 A CN 201611068499A CN 106589723 B CN106589723 B CN 106589723B
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- 239000007788 liquid Substances 0.000 title claims abstract description 70
- 238000001914 filtration Methods 0.000 title claims abstract description 63
- 239000012528 membrane Substances 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000002245 particle Substances 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 13
- 239000002518 antifoaming agent Substances 0.000 claims description 12
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 11
- KBPLFHHGFOOTCA-UHFFFAOYSA-N 1-Octanol Chemical compound CCCCCCCCO KBPLFHHGFOOTCA-UHFFFAOYSA-N 0.000 claims description 10
- 238000002360 preparation method Methods 0.000 claims description 10
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 9
- 239000004094 surface-active agent Substances 0.000 claims description 9
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 8
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 8
- 238000005266 casting Methods 0.000 claims description 7
- 239000002904 solvent Substances 0.000 claims description 7
- 239000010963 304 stainless steel Substances 0.000 claims description 6
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 claims description 6
- 238000011001 backwashing Methods 0.000 claims description 6
- 239000003431 cross linking reagent Substances 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000004014 plasticizer Substances 0.000 claims description 6
- STCOOQWBFONSKY-UHFFFAOYSA-N tributyl phosphate Chemical compound CCCCOP(=O)(OCCCC)OCCCC STCOOQWBFONSKY-UHFFFAOYSA-N 0.000 claims description 6
- 239000000839 emulsion Substances 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 5
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- 239000002202 Polyethylene glycol Substances 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 4
- 229920001223 polyethylene glycol Polymers 0.000 claims description 4
- 238000005096 rolling process Methods 0.000 claims description 4
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- RBNPOMFGQQGHHO-UHFFFAOYSA-N glyceric acid Chemical compound OCC(O)C(O)=O RBNPOMFGQQGHHO-UHFFFAOYSA-N 0.000 claims description 3
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 3
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- 238000000034 method Methods 0.000 abstract description 15
- 230000008569 process Effects 0.000 abstract description 14
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 6
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 3
- 239000001569 carbon dioxide Substances 0.000 abstract description 3
- 231100000252 nontoxic Toxicity 0.000 abstract description 3
- 230000003000 nontoxic effect Effects 0.000 abstract description 3
- 239000005022 packaging material Substances 0.000 abstract description 3
- 239000004579 marble Substances 0.000 abstract description 2
- 239000002985 plastic film Substances 0.000 abstract description 2
- 229920006255 plastic film Polymers 0.000 abstract description 2
- 239000012535 impurity Substances 0.000 description 18
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
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Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L29/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal or ketal radical; Compositions of hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Compositions of derivatives of such polymers
- C08L29/02—Homopolymers or copolymers of unsaturated alcohols
- C08L29/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
- B01D29/05—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements supported
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
- B01D29/56—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection
- B01D29/58—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection arranged concentrically or coaxially
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/60—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor integrally combined with devices for controlling the filtration
- B01D29/601—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor integrally combined with devices for controlling the filtration by clearness or turbidity measuring
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
- B01D29/68—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2329/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
- C08J2329/02—Homopolymers or copolymers of unsaturated alcohols
- C08J2329/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2471/00—Characterised by the use of polyethers obtained by reactions forming an ether link in the main chain; Derivatives of such polymers
- C08J2471/02—Polyalkylene oxides
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/16—Applications used for films
Abstract
The invention provides fine filtration equipment for filtering feed liquid of a medium-temperature water-soluble membrane, and relates to the technical field of plastic films. Compared with the common water-soluble film, the product of the invention has the characteristics of high transparency, good uniformity and high softness, has simple production process, can be used in the processes of artificial limb production and marble production, is especially suitable for the humid environment in the process of long-distance marine transportation of articles, can be thoroughly degraded into nontoxic and harmless water and carbon dioxide in the later period, is an environment-friendly packaging material which is convenient to use, and has wide application prospect.
Description
Technical Field
The invention relates to the technical field of membrane preparation, in particular to fine filtration equipment for filtering feed liquid of a medium-temperature water-soluble membrane.
Background
At present, with the development of market economy and the improvement of the living standard of people, various plastic products are seen everywhere in our life and production and play a vital role. In recent years, the use of degradable films has been vigorously advocated in society in response to the demand for environmental protection, and the appearance of degradable films has greatly solved the problem of environmental pollution, and plastic films used in production and life have been gradually replaced by degradable films.
At present, the market space of the water-soluble film is wider, the water-soluble film can be dissolved in water, the existing water-soluble film has the defects of low transparency and poor uniformity, the manufacturing process of the product is complex, the water-soluble film does not have the characteristic of dissolution corresponding to different temperatures, meanwhile, the water-soluble film cannot be completely degraded in the degradation process, and partial impurities polluting the environment are left, so the water-soluble film is not widely applied in various fields.
SUMMERY OF THE UTILITY MODEL
The invention aims to solve the technical problem of the prior art and provides fine filtration equipment for filtering feed liquid of a medium-temperature water-soluble membrane, which is characterized by comprising a tank body with a feed inlet and a discharge outlet, a screen, a back washing pipeline, a detection device and a return pipe, wherein the return pipe is connected with the upper end and the lower end of the tank body and is positioned on the side part of the tank body, the tank body is of a cone-shaped structure with the upper part and the lower part and a cylindrical hollow structure with the middle part, the feed inlet is arranged at the center of the lower end of the tank body, the front end of the feed inlet is provided with a pressurizing device, the discharge outlet is arranged at the center of the upper end of.
The medium temperature is a temperature of 65 ℃.
Preferably, the surfactant is one or more of sodium dodecyl sulfate, sodium dodecyl benzene sulfonate and glycerol ether.
Preferably, the defoaming agent is one or more of tween, octanol, an organic silicon emulsion and tributyl phosphate.
The preparation method of the medium-temperature water-soluble film specifically comprises the following steps:
step S100: according to the formula ratio, 10-18% of polyvinyl alcohol PVA1799 by mass percent; 3-6% of glycerol, 4-8% of glycol and 3-6% of polyethylene glycol by mass percentage are taken as plasticizers; 1-2% by mass of a surfactant; 67-75% by mass of solvent water; 0.1-0.5% of defoaming agent and 0.3-1% of cross-linking agent by mass percent are put into a mixing tank and stirred uniformly;
step S200: stirring until the feed liquid is fine and smooth and has no large particles observed by eyes, heating until the temperature of the feed liquid reaches a set temperature, preserving heat, stirring at high speed for no less than one hour, and fully dissolving and dispersing the material;
step S300: primary filtering to adjust the grain diameter to 60-100 meshes;
step S400: adjusting the viscosity, and adjusting the viscosity value to 70-100 seconds under a certain temperature condition.
Step S500: fine filtering, namely using fine filtering equipment to adjust the particle size to be more than 150 meshes;
step S600: defoaming the feed liquid to obtain slurry for later use;
step S700: casting the feed liquid on a roller or steel belt casting equipment for drying and molding, and rolling the film with the thickness of 20-60 mu m to finish the film preparation.
Preferably, the primary filtering in the step S300 is performed by using primary filtering equipment, the primary filtering equipment comprises a second tank body provided with a second feeding port and a second discharging port, a second sieve plate and a second filter screen, the second sieve plate and the second filter screen are arranged in the second tank body, and after the feed liquid enters the second tank body, the particle size is adjusted to 70-90 meshes through the second sieve plate and the second filter screen.
Preferably, the viscosity is adjusted in step S400 at a temperature of 75-85 ℃ so that the viscosity is adjusted to 75-95 seconds.
Preferably, in the fine filtration in step S500, the particle size is adjusted to 200 mesh or more after the fine filtration is performed by using a fine filtration device.
Preferably, the screen comprises a screen and more than two screen plates which are positioned at the upper side and the lower side of the screen and are fastened with the screen into a whole.
Preferably, the aperture of the filter screen is more than 200 meshes, the aperture of the sieve plate is 8-10mm, and the filter screen and the sieve plate are both made of 304 stainless steel.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: compared with a common water-soluble film, the water-soluble film has the characteristics of high transparency, good uniformity and high softness, is simple in manufacturing process, can be used for packaging pesticides, embroidery, cement additives and the like, greatly improves the use convenience of the product, can be thoroughly degraded into non-toxic and harmless water and carbon dioxide in the later period, is an environment-friendly packaging material, and has wide application prospect.
Drawings
FIG. 1 is a cross-sectional view of a primary filter apparatus according to an embodiment of the present invention.
Fig. 2 is a schematic mechanism diagram of the fine filtering apparatus according to the embodiment of the present invention.
Fig. 3 is a schematic diagram of the structure of the screen of fig. 2.
In the figure: 1. a tank body; 11. a feed inlet; 12. a discharge port; 13. a pressurizing device; 2. screening a screen; 21. filtering with a screen; 22. a sieve plate; 3. back flushing the pipeline; 4. a detection device; 5. a return pipe; 6. a second tank body; 71. a second sieve plate; 72. and a second filter screen.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments.
A fine filtration equipment for filtering feed liquid of a medium-temperature water-soluble membrane: the device comprises a tank body 1 with a feeding hole 11 and a discharging hole 12, a screen 2, a backwashing pipeline 3, a detection device 4 and a return pipe 5 which is connected with the upper end and the lower end of the tank body 1 and is positioned on the side part of the tank body 1, wherein the tank body 1 is a cone-shaped hollow structure with the upper part and the lower part and the middle part in a cylindrical shape, the feeding hole 11 is arranged at the center of the lower end of the tank body 1, the front end of the feeding hole is provided with a pressurizing device 13, the discharging hole 12 is arranged at the center of the upper end of the tank body 1, the two ends of the return pipe. The tank body 1 adopts a hollow form of cones at two ends of a middle cylinder, and the structural form can avoid the feed liquid from forming too many bubbles in the process of entering and exiting, so that the apparent quality of a later-stage degradable membrane is influenced, and too many small bubbles are prevented from being formed in the membrane. The setting of back flow pipe 5 can make the feed liquid detect through detection device 4 to the particle diameter and the impurity content of feed liquid after filtering through screen cloth 2, if can not reach corresponding quality standard, then carry 11 departments to the feed inlet again through back flow pipe 5, send into jar body 1 in after the pressurization through pressure device 13, and then realize the secondary filtration of feed liquid to be used for the preparation of later stage degradation membrane product after reaching due quality standard. The back washing pipeline 3 is a reverse impurity removing device after the high-viscosity liquid filter is used for a period of time, after the high-viscosity liquid filter is operated for a period of time, large-particle-size impurities are accumulated on the lower surface of the screen 2, so that the operation speed of the feed liquid in the tank body 1 is influenced, the pressure value of the pressurizing device 13 is required to be further increased, in order to avoid energy waste and improve the working efficiency, the screen 2 in the tank body 1 needs to be subjected to back washing impurity removal, and a medium adopted in the impurity removing process is hot steam. The hot steam passes through the screen mesh 2 in the opposite direction relative to the liquid flow direction under the pressure action, impurities in the screen mesh 2 are removed, the impurities fall to the bottom of the tank body 1 in a liquid mixture mode and are discharged until the removed hot steam is pure hot steam, and the cleaning process is finished.
The preparation method of the medium-temperature water-soluble film specifically comprises the following steps:
step S100: according to the formula ratio, 10-18% of polyvinyl alcohol PVA1799 by mass percent; 3-6% of glycerol, 4-8% of glycol and 3-6% of polyethylene glycol by mass percentage are taken as plasticizers; 1-2% by mass of a surfactant; 67-75% by mass of solvent water; 0.1-0.5% of defoaming agent and 0.3-1% of cross-linking agent by mass percent are put into a mixing tank and stirred uniformly;
stirring solvent water at the speed of 50-70 r/min at room temperature, slowly adding polyvinyl alcohol PVA1799, stirring thoroughly after adding the materials, agglomerating and dispersing completely, heating to 50-60 deg.C, soaking at low speed for about 60 min, and dissolving the raw materials completely. Then adding a cross-linking agent, a plasticizer, a surfactant and a defoaming agent, wherein the defoaming agent such as Tween, octanol, an organic silicon emulsion, tributyl phosphate and the like can be added to avoid generating foam in the dissolving process. The storage of the aqueous solution was carried out using 304 stainless steel vessels. High polymer materials such as starch and the like are added to the special functional film shell to change the performance of the special functional film shell.
Step S200: stirring until the feed liquid is fine and smooth and has no large particles observed by eyes, heating to the temperature of the feed liquid of 95 ℃, and keeping the temperature and stirring for not less than one hour at the speed of 50-70 r/min, so that the materials are fully dissolved and dispersed, and large-particle-size impurities cannot be formed in the feed liquid due to uneven stirring of the materials.
Step S300: primary filtering to adjust the grain diameter to 60-100 meshes;
step S400: adjusting the viscosity, and adjusting the viscosity value to 70-100 seconds under a certain temperature condition.
Step S500: fine filtering, namely using fine filtering equipment to adjust the particle size to be more than 150 meshes;
step S600: and (4) defoaming the feed liquid to obtain slurry for later use. As more micro-bubbles can be continuously generated in the feed liquid after the processes of primary filtration, viscosity adjustment and fine filtration, if the part of bubbles is not treated, the performance and the apparent quality of a product at the later stage are seriously influenced, so that the feed liquid is subjected to defoaming treatment again through the step, the bubbles contained in the feed liquid are removed to the maximum extent before molding, and the preparation is made for subsequent tape casting molding.
Step S700: casting the feed liquid on a roller or steel belt casting equipment for drying molding or post-treatment, and controlling the thickness of the film to be 20-60 mu m for rolling to finish the film preparation. In the film forming process of the feed liquid, the forming parameters of the equipment are adjusted according to the requirements of customers so as to obtain a water-soluble film with proper thickness.
The sum of the mass percentages of the polyvinyl alcohol PVA1799, the plasticizer, the surfactant, the solvent and the defoaming agent is 100%.
Preferably, the surfactant is one or a mixture of any of sodium dodecyl sulfate, sodium dodecyl benzene sulfonate and glycerol ether.
Preferably, the defoaming agent is one or more of tween, octanol, an organic silicon emulsion and tributyl phosphate.
Preferably, the primary filtration in the step S300 is performed by using a primary filtration device, the primary filtration device comprises a second tank body 6 provided with a second feed inlet 61 and a second discharge outlet 62, a second sieve plate 71 and a second filter screen 72, and after the feed liquid enters the second tank body 6, the particle size is adjusted to 70-90 meshes after the feed liquid is filtered by the second sieve plate 71 and the second filter screen 72. And (3) filtering the feed liquid by using primary filtering equipment under a natural state by using a second sieve plate 71 and a second filter screen 72 so as to obtain the feed liquid with the particle size of 70-90 meshes, primarily filtering impurities in the feed liquid and improving the purity of the feed liquid.
Preferably, the viscosity is adjusted in step S400 at a temperature of 75-85 ℃ so that the viscosity is adjusted to 75-95 seconds. The viscosity adjustment is carried out by adding a proper amount of hot water at the temperature of 75-85 ℃ to adjust the required viscosity to be 70-95 seconds.
Preferably, in the fine filtration in step S500, the particle size is adjusted to 70-90 mesh after the fine filtration is performed by using a fine filtration device. Adopt the essence equipment of straining, utilize sieve 22 and filter screen 21 cooperation pressure device 13 to use, above-mentioned equipment filters the feed liquid under the pressurized state, can adjust the particle size of feed liquid to more than 200 meshes under the effect of sieve 22 and filter screen 21, and the cooperation of pressure device 13 is used and has further improved the filter effect of feed liquid, and what be convenient for the feed liquid better carries out deep filtration under the pressurized state, provides fine guarantee for the quality of later stage product.
Preferably, the screen 2 includes a screen 21 and two or more screen plates 22 located at upper and lower sides of the screen 21 and fastened to the screen 21. The screen 2 includes the sieve 22 that has certain rigidity and the filter screen 21 that has the filter effect, and sieve 22 sets up to two-layer altogether, is located the upper end and the lower extreme of whole screen 2 respectively, avoids feed liquid to filter and back flush in-process feed liquid or edulcoration medium to form too big pressure to screen 2 and cause sieve 2 to warp, and the filter screen that sets up between two blocks of upper and lower sieve 22 then can effectively get rid of the impurity in the feed liquid.
Furthermore, the aperture of the filter screen 21 is more than 200 meshes, the aperture of the sieve plate 22 is 8-10mm, and the filter screen 21 and the sieve plate 22 are both made of 304 stainless steel. To filter screen 21 and sieve 22, should generally adopt corrosion resistant material, avoid sieve 2 to produce other impurity in long-term filtering process, cause the influence to the feed liquid quality, the two all adopts 304 stainless steel, this material chooseing for use has guaranteed that the feed liquid can not contact more impurity, avoids influencing product quality, the filter screen adopts the aperture more than 200 meshes, can the effectual filter fineness who guarantees the feed liquid, avoid impurity to get rid of the defect of the not thorough degradation membrane product apparent quality who causes. The sieve plate 22 has certain rigidity and is respectively positioned at the upper end and the lower end of the whole sieve plate 2, so that the sieve plate 2 is prevented from deforming due to the fact that the material liquid or impurity removing media form overlarge pressure on the sieve plate 2 in the material liquid filtering and backwashing processes, and the sieve plate 2 has rigidity and smaller aperture in the whole sieve plate 2 by the combined use mode of the filter screen 21 and the sieve plate 22, and can effectively remove impurities in the material liquid.
Example (b):
the medium-temperature water-soluble film comprises the following components in percentage by mass: polyvinyl alcohol PVA 1799: 15%, glycerin: 4%, ethylene glycol: 6%, polyethylene glycol: 5%, sodium dodecylbenzenesulfonate: 1.5 percent, 0.3 percent of tributyl phosphate and 0.2 percent of cross-linking agent; the solvent water is 68%.
The preparation method comprises the following steps: stirring solvent water at the speed of 50-70 r/min at room temperature, slowly adding polyvinyl alcohol PVA1799, stirring thoroughly after adding the materials, agglomerating and dispersing completely, heating to 50-60 deg.C, soaking at low speed for about 60 min, and dissolving the raw materials completely. Then adding a cross-linking agent, a plasticizer, a surfactant and a defoaming agent, wherein the defoaming agent such as Tween, octanol, an organic silicon emulsion, tributyl phosphate and the like can be added to avoid generating foam in the dissolving process. The storage of the aqueous solution was carried out using 304 stainless steel vessels. High polymer materials such as starch and the like are added to the special functional film shell to change the performance of the special functional film shell. Stirring until the feed liquid is fine and smooth and has no large particles observed by eyes, heating to the temperature of the feed liquid of 95 ℃, and keeping the temperature and stirring for not less than one hour at the speed of 50-70 r/min, so that the materials are fully dissolved and dispersed, and large-particle-size impurities cannot be formed in the feed liquid due to uneven stirring of the materials. The liquid is preliminarily bubbled under the action of a defoaming agent, the liquid enters a preliminary filtering process, the liquid is preliminarily filtered under a natural state by utilizing a sieve plate II 71 and a filter screen II 72 to remove impurities to obtain the liquid with the grain diameter of about 80 meshes, then a proper amount of hot water is added at the temperature of 80 ℃ to adjust the liquid to obtain the liquid with the viscosity of 85 seconds, then fine filtering is carried out, the liquid is filtered under a pressurized state, the grain diameter of the liquid can be adjusted to be between 200 meshes and 220 meshes under the action of the sieve plate 22 and the filter screen 21, then the liquid after the defoaming treatment is cast on a roller or steel belt casting equipment to be dried and formed into a water-soluble film with the thickness of 60 mu m, and then rolling is carried out to complete film making.
When the water temperature of the medium-temperature water-soluble film is 65 ℃, the time for completely dissolving the water-soluble film with the thickness of 60 mu m is 130-150 seconds.
Compared with the common water-soluble film, the product of the invention has the characteristics of high transparency, good uniformity and high softness, has simple production process, can be used in the processes of artificial limb production and marble production, is especially suitable for the humid environment in the process of long-distance marine transportation of articles, can be thoroughly degraded into nontoxic and harmless water and carbon dioxide in the later period, is an environment-friendly packaging material which is convenient to use, and has wide application prospect.
Claims (5)
1. The fine filtration equipment for filtering the feed liquid of the medium-temperature water-soluble membrane is characterized by comprising a tank body (1) with a feed inlet (11) and a discharge outlet (12), a screen (2), a back washing pipeline (3), a detection device (4) and a return pipe (5) which is connected with the upper end and the lower end of the tank body (1) and is positioned on the side part of the tank body (1), wherein the tank body (1) is of a cone-shaped structure from top to bottom and has a cylindrical hollow structure from the middle, the feed inlet (11) is arranged at the center of the lower end of the tank body (1), the front end of the feed inlet is provided with a pressurizing device (13), the discharge outlet (12) is arranged at the center of the upper end of the tank body (1), the two ends of the return pipe (5) are respectively connected with the tail end of the detection device (4;
the screen (2) comprises a screen (21) and more than two screen plates (22) which are positioned at the upper side and the lower side of the screen (21) and are fastened with the screen (21) into a whole;
the aperture of the filter screen (21) is more than 200 meshes, the aperture of the sieve plate (22) is 8-10mm, and the filter screen (21) and the sieve plate (22) are both made of 304 stainless steel;
the preparation method of the medium-temperature water-soluble film specifically comprises the following steps:
step S100: according to the formula ratio, 10-18% of polyvinyl alcohol PVA1799 by mass percent; 3-6% of glycerol, 4-8% of glycol and 3-6% of polyethylene glycol by mass percentage are taken as plasticizers; 1-2% by mass of a surfactant; 67-75% by mass of solvent water; 0.1-0.5% of defoaming agent and 0.3-1% of cross-linking agent by mass percent are put into a mixing tank and stirred uniformly;
step S200: stirring until the feed liquid is fine and smooth and has no large particles observed by eyes, heating until the temperature of the feed liquid reaches a set temperature, preserving heat, stirring at high speed for no less than one hour, and fully dissolving and dispersing the material;
step S300: primary filtering to adjust the grain diameter to 60-100 meshes;
step S400: adjusting the viscosity, and adjusting the viscosity value to 70-100 seconds under a certain temperature condition;
step S500: fine filtration, wherein the fine filtration equipment is used, the screen (2) is matched with a pressurizing device (13), and the feed liquid is filtered by the screen (2) under the pressurized state, so that the particle size is adjusted to be more than 150 meshes;
step S600: defoaming the feed liquid to obtain slurry for later use;
step S700: casting the feed liquid on a roller or steel belt casting equipment for drying and molding, controlling the thickness of the film to be 20-60 mu m for rolling, and finishing the film preparation
The preliminary filtration in step S300 adopts the preliminary filtration equipment, the preliminary filtration equipment is including the jar body two (6) that is equipped with feed inlet two (61) and discharge gate two (62), set up in inside sieve two (71) and the filter screen two (72) of jar body two (6), and after the feed liquid got into jar body two (6), made the particle size adjustment to between 70-90 meshes after the filtration of sieve two (71) and filter screen two (72).
2. The fine filtration equipment for filtering feed liquid of the medium-temperature water-soluble membrane according to claim 1, wherein the surfactant is one or more of sodium dodecyl sulfate, sodium dodecyl benzene sulfonate and glycerol ether.
3. The fine filtration equipment for filtering feed liquid of the medium-temperature water-soluble membrane as claimed in claim 1, wherein the defoaming agent is one or more of tween, octanol, silicone emulsion and tributyl phosphate.
4. The fine filtration apparatus for filtering a feed liquid of a medium-temperature water-soluble membrane according to claim 2, wherein the viscosity is adjusted in step S400 at a temperature of 75-85 ℃ so that the viscosity is adjusted to 75-95 seconds.
5. The fine filtration device of claim 2, wherein in the fine filtration in step S500, the particle size is adjusted to 200 mesh or more after the fine filtration device is used for filtration.
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| CN201611068499.5A CN106589723B (en) | 2016-11-29 | 2016-11-29 | A essence filtration equipment for filtering feed liquid of medium temperature water-soluble membrane |
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| CN201611068499.5A CN106589723B (en) | 2016-11-29 | 2016-11-29 | A essence filtration equipment for filtering feed liquid of medium temperature water-soluble membrane |
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| CN109796796A (en) * | 2019-01-25 | 2019-05-24 | 中国工程物理研究院材料研究所 | A kind of low-temperature water-soluble close membrane and its preparation and application |
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| WO2002059213A1 (en) * | 2001-01-23 | 2002-08-01 | Du Pont-Toray Co., Ltd. | Composition for chemical admixture and method for production thereof, and method for recycling waste from heat-resistant high functional polymer product or poly(vinyl alcohol) product and use thereof |
| FR2859123B1 (en) * | 2003-08-28 | 2006-12-01 | Frank Et Pignard Ets | TREE EQUIPPED WITH AN OPTICAL RING AND METHOD FOR MANUFACTURING THE TREE |
| WO2011043932A1 (en) * | 2009-10-07 | 2011-04-14 | Arkema Inc. | Melt processable composition from recycled multi-layer articles containing a fluoropolymer layer |
| CN205055568U (en) * | 2015-10-15 | 2016-03-02 | 新乡正源净化科技有限公司 | Polyvinyl alcohol filter |
| CN105504616A (en) * | 2015-12-25 | 2016-04-20 | 佛山市博维环保材料有限公司 | Water-soluble thin film with good compatibility and preparation method thereof |
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