CN112048918B - Special heat-insulating cover cloth for durable electrolytic cell and preparation method - Google Patents
Special heat-insulating cover cloth for durable electrolytic cell and preparation method Download PDFInfo
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- CN112048918B CN112048918B CN202010957089.6A CN202010957089A CN112048918B CN 112048918 B CN112048918 B CN 112048918B CN 202010957089 A CN202010957089 A CN 202010957089A CN 112048918 B CN112048918 B CN 112048918B
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- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
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- D01F1/00—General methods for the manufacture of artificial filaments or the like
- D01F1/02—Addition of substances to the spinning solution or to the melt
- D01F1/07—Addition of substances to the spinning solution or to the melt for making fire- or flame-proof filaments
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- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/44—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds
- D01F6/46—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds of polyolefins
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- D06N3/0015—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the substrate using fibres of specified chemical or physical nature, e.g. natural silk
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- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
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Abstract
The invention belongs to the field of refining of industrial electrolytic cells, particularly relates to a technology of protective covering cloth for accessories of an electrolytic cell, and particularly relates to a special heat-insulating covering cloth for a durable electrolytic cell and a preparation method thereof. Firstly, preparing a polypropylene flat filament, twisting the flat filament and a glass fiber spun yarn into a composite wire, and weaving the composite wire serving as a warp and a weft according to the warp and the weft to obtain base cloth; the base cloth is treated by the dispersion prepared from the water glass, the hollow glass microspheres and the polytetrafluoroethylene emulsion, and because gaps exist between the flat filaments of the base cloth and the glass fiber spun yarns, the affinity and the bonding property of the water glass and the glass fiber are good, so that the hollow glass microspheres are bonded and remained in the gaps, the cover cloth has a good heat insulation effect, is not easy to fall off, has good durability, and effectively prevents acid mist erosion of an electrolytic cell.
Description
Technical Field
The invention belongs to the field of refining of industrial electrolytic cells, particularly relates to a technology of protective covering cloth for accessories of an electrolytic cell, and particularly relates to a special heat-insulating covering cloth for a durable electrolytic cell and a preparation method thereof.
Background
Along with the gradual refinement of the smelting technology, the energy conservation and optimization in each link are the key for reducing the cost and the loss of the smelting enterprises at present. In the production process of copper electrolysis, the electrolytic cell is used as a key link of refining, and a huge space exists in the aspects of ensuring quality, reducing cost and maintaining environment. If in the copper electrolysis process, steam is needed to be used for heating of electrolyte and washing and scalding of a cathode and an anode, the current efficiency can be improved and the cell voltage can be reduced when the copper electrolysis process is operated at higher temperature, but when the temperature is higher than 70 ℃, the evaporation amount of acid mist is increased, and the operation environment is deteriorated. In order to prevent heat dissipation of the surface of the electrolytic bath, prevent acid mist from diffusing and protect the operating environment, treatment measures for preventing heat dissipation and corrosion are needed. Such as a commonly used heat-insulating cover plate, a glass fiber reinforced plastic cover plate and the like. However, the heat-insulating cover plate and the glass fiber reinforced plastic cover plate are heavy and high in cost, and are difficult to observe when the cover is frequently opened, and particularly when multiple grooves are used in parallel, great difficulty is caused to operation. Currently, they are gradually replaced by low cost drapes. If the plastic woven cloth is used, the cost is low, and the cover is convenient to lift.
Chinese utility model patent publication No. CN204198881U discloses an electrolytic cell cover cloth, which is provided with a thin layer that is sealed and acid and alkali resistant on the upper and lower surfaces of a woven cloth that is woven by insulating and flame-retardant sheet plastic strips as warp and weft orthogonal, and it not only keeps warm, but also is acid mist resistant, and has obtained extensive use in the electrolytic cell cover cloth of electrolytic copper.
However, the durability of the existing plastic woven cover cloth in a long-time acid mist environment is not enough, and the heat preservation effect is not excellent in the performances of cover plates such as heat preservation plates and glass fiber reinforced plastics. If the existing plastic woven cover cloth is used for a long time on the surface of the electrolytic cell, the woven cloth is easy to damage, and the acid and alkali resistant layer is easy to drop into the electrolytic cell and is directly mixed in finished cathode copper.
Disclosure of Invention
Aiming at the problems of poor durability and insufficient heat preservation effect of the conventional plastic woven cloth used for cover cloth of the electrolytic cell, the invention provides a special heat preservation cover cloth for the durable electrolytic cell; further, a preparation method of the special insulation cover cloth for the electrolytic cell is specifically disclosed.
In order to achieve the technical effects, the invention firstly provides a preparation method of the special heat-insulating cover cloth for the durable electrolytic cell, which is characterized by comprising the following steps of:
(1) adding polypropylene, a flame retardant, an inorganic filler and a lubricant into a high-speed mixer, uniformly dispersing, then carrying out melt extrusion through a screw extruder, and extruding into a flat film through a T-shaped die head of the screw extruder; cutting the flat film into blank filaments by a blade; drawing the blank filament 6-8 times in a hot air channel at 110 ℃ to obtain a flat filament with 1000-1200 denier;
(2) twisting the flat filaments obtained in the step (1) and the glass fiber spun yarns together, and performing heat setting at 140-145 ℃ to obtain composite wires with gaps;
(3) weaving the composite wires obtained in the step (2) as warps and wefts according to the warps and the wefts to obtain base cloth;
(4) adding water glass and hollow glass microspheres into the polytetrafluoroethylene emulsion, uniformly stirring to form viscous dispersion, soaking the base cloth obtained in the step (3) in the dispersion for 5-10min, scraping off the redundant dispersion on the surface of the base cloth by a scraper, drying, locking edges, and coiling to obtain the durable special insulation cover cloth for the electrolytic cell.
Preferably, the polypropylene, the flame retardant, the inorganic filler and the lubricant in the step (1) are prepared by weight parts, and specifically, 80-100 parts of polypropylene, 1-2 parts of flame retardant, 3-8 parts of inorganic filler and 1-3 parts of lubricant are selected; wherein the polypropylene is suitable for wire drawing, and the specific preferred grades are PPT300 and PPF 401; the flame retardant is selected from plastic conventional flame retardants, such as decabromodiphenyl ether, tetrabromobisphenol A, octabromoether, octabromobis S ether and TBC, or mature flame retardant master batches are directly used for convenient use, and particularly, a flame retardant compounded by decabromodiphenyl ether and antimony trioxide in a mass ratio of 1:1 is preferred; the inorganic filler is at least one of talcum powder, wollastonite powder, barium sulfate powder and montmorillonite powder, and the particle size is required to be 1250 meshes; the lubricant is at least one of polypropylene wax, polyethylene wax, stearic acid and paraffin wax.
Preferably, the screw extruder in the step (1) is a co-rotating twin-screw extruder, the further preferred length-diameter ratio of the screw is 40-48:1, the co-rotating twin-screw extruder has good shear dispersibility, and the higher length-diameter ratio is matched to facilitate the uniform dispersion of materials, so that the uniform flat film can be extruded.
Preferably, the temperature setting of the screw extruder in the step (1) is controlled at 190-220 ℃.
Preferably, the width of the flat filament in the step (1) is 0.5-0.8 mm.
Preferably, the glass fiber spun yarn in the step (2) is a continuous glass fiber cabling yarn, the linear density is 66dtex, 2 strands are cabled, and the twist is 100-.
Preferably, in the step (2), the cabling is carried out such that the cabling twist is 150-.
Preferably, in the step (4), the water glass, the hollow glass microspheres and the polytetrafluoroethylene emulsion are dispersed in a mass ratio of 1:1-3: 10-15.
Preferably, the water glass in the step (4) has good adhesion, particularly good adhesion to inorganic matters, the flat filaments and the glass fiber spun yarns in the base cloth are twisted, the strong affinity adhesion between the glass fibers and the water glass enables the water glass and the base cloth to be firmly bonded, and the water glass is resistant to high temperature and acid corrosion in bonding; the particle size of the hollow glass microspheres is selected to be screened by a 500-mesh sieve, the hollow glass microspheres have good heat insulation effect and small particle size, are filled in gaps between the flat filaments of the base cloth and the glass fiber spun yarns and on the surface of the base cloth, are firmly attached under the bonding effect of sodium silicate and polytetrafluoroethylene emulsion, are not easy to fall off, and endow the base cloth with good heat insulation effect; the polytetrafluoroethylene emulsion is 60 wt% of high-concentration polytetrafluoroethylene aqueous phase dispersion (the commercial model is FR301B), viscous dispersion is obtained by adding water glass and hollow glass microspheres, and when the dispersion is soaked in the base cloth, the affinity of the water glass and the glass fibers enables the hollow microspheres to better reside in gaps bonded with the flat filaments and the glass fiber spun yarns and gaps and surfaces of the base cloth, so that the hollow glass microspheres are not easy to fall off and have good durability; simultaneously, the dispersion liquid is viscous, and a dispersion liquid coating with a certain thickness is formed on two surfaces of the base cloth by controlling the force of the scraper; the thickness of the coating on the two sides of the base cloth is preferably 0.1-0.2 mm.
Furthermore, the invention provides the durable special insulation covering cloth for the electrolytic cell, which is prepared by the method. In order to solve the problems of poor durability and insufficient heat preservation effect of the conventional woven cloth made of polypropylene plastic material for the cover cloth of the electrolytic cell, the invention firstly prepares a polypropylene flat filament, twists the flat filament and glass fiber spun yarn into a composite wire, and weaves the composite wire as warp and weft according to the warp and weft to obtain base cloth; the base cloth is treated by the dispersion prepared from the water glass, the hollow glass microspheres and the polytetrafluoroethylene emulsion, and because gaps exist between the flat filaments of the base cloth and the glass fiber spun yarns, the affinity and the bonding property of the water glass and the glass fiber are good, so that the hollow glass microspheres are bonded and remained in the gaps, the cover cloth has a good heat insulation effect, is not easy to fall off, has good durability, and effectively prevents acid mist erosion of an electrolytic cell.
Compared with the existing cover cloth of the electrolytic cell, the special heat-insulating cover cloth for the durable electrolytic cell and the preparation method thereof have the outstanding characteristics and remarkable progress that:
(1) the invention reasonably introduces the inorganic hollow glass ball into the cover cloth of the electrolytic cell, and solves the problems of poor heat preservation and poor durability of the cover cloth of the electrolytic cell at present.
(2) Aiming at the problem that the gap glass microsphere is not easy to combine with the plastic cover cloth, the invention twists the polypropylene flat filament and the glass fiber spun yarn, and the hollow glass microsphere is easy to be reserved in the gap through reserving more twisting gaps, thereby overcoming the problems that the plastic cover cloth coating of the prior electrolytic tank is easy to fall off and age.
(3) The invention effectively combines inorganic and organic, the obtained cover cloth of the electrolytic cell has the characteristics of durability and heat preservation, the coating formed by the inorganic adhesive effectively protects the base cloth from being corroded by acid, and the service life of the cover cloth is prolonged.
(4) The cover cloth of the electrolytic cell prepared by the invention is flexible and light, is particularly suitable for being used in the electrolytic copper process, not only plays the roles of heat preservation, energy conservation and environment purification, but also greatly saves the cost for the electrolytic copper enterprises.
Drawings
The technical scheme of the invention is further explained by combining the accompanying drawings as follows:
FIG. 1 is a schematic diagram of a composite wire with gaps formed by twisting flat yarns and glass fiber spun yarns in the process of preparing the special insulation cover cloth for the durable electrolytic cell; in the figure: 1-glass fiber spun yarn; 2-flat filament.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to 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. All other embodiments obtained by a person skilled in the art without any inventive step based on the technical idea of the present invention shall fall within the scope of protection of the present invention.
Example 1
(1) 100kg of polypropylene (provided by Shanghai stone melting) with the mark of PPT300, 1kg of decabromodiphenyl ether, 1kg of antimony trioxide, 5kg of talcum powder with the particle size of 1250 meshes and 2kg of lubricant polypropylene wax are added into a high-speed mixer, the temperature of the high-speed mixer is set to be 100 ℃, the mixture is dispersed for 35min at the stirring speed of 400rpm, and then the mixture is melted and extruded by a co-rotating double-screw extruder with the length-diameter ratio of a screw being 44:1, and the mixture is extruded into a flat film by a T-shaped die of the screw extruder; five sections of heating are arranged on the co-rotating double-screw extruder, and the first section is 190 ℃; a second section of 205 ℃; a third stage of 210 ℃; a fourth stage of 215 ℃; the fifth section is 200 ℃; the extrusion temperature of the T-shaped die is 200 ℃; cooling the flat film, and cutting the flat film into blank filaments by using a blade; drawing the blank filaments 6 times in a hot air duct at 110 ℃ to obtain flat filaments with 1200 denier and 0.8mm width;
(2) twisting the 1 strand of flat yarn obtained in the step (1) and the 1 strand of glass fiber spun yarn in parallel, wherein the twist degree is 150 twists per meter, and performing heat setting at 140 ℃ to obtain a gapped composite wire; as shown in the attached drawings, 1 in the figure is glass fiber spun yarn; 2 is a flat filament; the selected glass fiber spun yarn is continuous glass fiber doubling and twisting yarn, the linear density is 66dtex, 2 strands are doubled and twisted, and the twist is 120 twists/m. (3) Weaving the composite wires obtained in the step (2) as warps and wefts according to the warps and the wefts to obtain base cloth;
(4) dispersing and stirring water glass, hollow glass microspheres and polytetrafluoroethylene emulsion uniformly in a mass ratio of 1:1:10 to form viscous dispersion, soaking the base cloth obtained in the step (3) in the dispersion for 5min, scraping the redundant dispersion on the surface of the base cloth by a scraper, drying, locking edges and rolling to obtain the durable special heat-insulating cover cloth for the electrolytic cell. The particle size of the hollow glass microspheres is 500 meshes, and the hollow glass microspheres have good heat insulation effect; the polytetrafluoroethylene emulsion is 60 wt% of high-concentration polytetrafluoroethylene aqueous phase dispersion (the commercial model is FR 301B); the two surfaces of the base cloth are respectively formed with coating layers with the thickness of 0.2mm by controlling the force of the scraper.
Example 2
(1) 100kg of polypropylene (provided by Shanghai stone melting) with the mark of PPT300, 1kg of decabromodiphenyl ether, 1kg of antimony trioxide, 5kg of talcum powder with the particle size of 1250 meshes and 2kg of lubricant polypropylene wax are added into a high-speed mixer, the temperature of the high-speed mixer is set to be 100 ℃, the mixture is dispersed for 35min at the stirring speed of 400rpm, and then the mixture is melted and extruded by a co-rotating double-screw extruder with the length-diameter ratio of a screw being 44:1, and the mixture is extruded into a flat film by a T-shaped die of the screw extruder; five sections of heating are arranged on the co-rotating double-screw extruder, and the first section is 190 ℃; a second section of 205 ℃; a third stage of 210 ℃; a fourth stage of 215 ℃; the fifth section is 200 ℃; the extrusion temperature of the T-shaped die is 200 ℃; cooling the flat film, and cutting the flat film into blank filaments by using a blade; drawing the blank filaments 6 times in a hot air duct at 110 ℃ to obtain flat filaments with 1200 denier and 0.8mm width;
(2) doubling and twisting the 1 strand of flat yarn obtained in the step (1) and the 1 strand of glass fiber spun yarn, wherein the twist degree is 200 twists per meter, and performing heat setting at 140 ℃ to obtain a gapped composite wire; the selected glass fiber spun yarn is continuous glass fiber doubling and twisting yarn, the linear density is 66dtex, 2 strands are doubled and twisted, and the twist number is 120 twists/m;
(3) weaving the composite wires obtained in the step (2) as warps and wefts according to the warps and the wefts to obtain base cloth;
(4) dispersing and stirring water glass, hollow glass microspheres and polytetrafluoroethylene emulsion uniformly in a mass ratio of 1:1:10 to form viscous dispersion, soaking the base cloth obtained in the step (3) in the dispersion for 5min, scraping the redundant dispersion on the surface of the base cloth by a scraper, drying and locking edges to obtain the durable special heat-insulating cover cloth for the electrolytic cell. The particle size of the hollow glass microspheres is selected to be screened by a 500-mesh sieve, and the hollow glass microspheres have good heat insulation effect; the polytetrafluoroethylene emulsion is 60 wt% of high-concentration polytetrafluoroethylene aqueous phase dispersion (the commercial model is FR 301B); the two surfaces of the base cloth are coated with a coating layer with the thickness of 0.2mm by controlling the force of the scraper.
Example 3
(1) 100kg of polypropylene (provided by Shanghai stone melting) with the trademark of PPT300, 1kg of decabromodiphenyl ether, 1kg of antimony trioxide, 8kg of wollastonite powder with the particle size of 1250 meshes and 1kg of lubricant polyethylene wax are added into a high-speed mixer, the temperature of the high-speed mixer is set to be 100 ℃, the mixture is dispersed for 35min at the stirring speed of 400rpm, and then the mixture is melted and extruded by a co-rotating double-screw extruder with the length-diameter ratio of a screw being 44:1, and the mixture is extruded into a flat film through a T-shaped die head of the screw extruder; five sections of heating are arranged on the co-rotating double-screw extruder, and the heating is respectively 200 ℃ at the first section; a second section of 205 ℃; a third stage of 215 ℃; the fourth stage is 220 ℃; the fifth section is 200 ℃; the extrusion temperature of the T-shaped die is 200 ℃; cooling the flat film, and cutting the flat film into blank filaments by using a blade; drawing the blank filaments 8 times in a hot air duct at 110 ℃ to obtain flat filaments with 1000 denier and 0.5mm width;
(2) twisting the 1 strand of flat yarn obtained in the step (1) and the 1 strand of glass fiber spun yarn in parallel, wherein the twist degree is 1500 twists per meter, and performing heat setting at 140 ℃ to obtain a gapped composite wire; the selected glass fiber spun yarn is continuous glass fiber doubling and twisting yarn, the linear density is 66dtex, 2 strands are doubled and twisted, and the twist is 100 twists/m;
(3) weaving the composite wires obtained in the step (2) as warps and wefts according to the warps and the wefts to obtain base cloth;
(4) dispersing and stirring water glass, hollow glass microspheres and polytetrafluoroethylene emulsion uniformly in a mass ratio of 1:3:15 to form viscous dispersion liquid, soaking the base cloth obtained in the step (3) in the dispersion liquid for 10min, scraping off the redundant dispersion liquid on the surface of the base cloth by a scraper, drying and locking the edges to obtain the durable special insulation cover cloth for the electrolytic cell. The particle size of the hollow glass microspheres is selected to be screened by a 500-mesh sieve, and the hollow glass microspheres have good heat insulation effect; the polytetrafluoroethylene emulsion is 60 wt% of high-concentration polytetrafluoroethylene aqueous phase dispersion (the commercial model is FR 301B); the two surfaces of the base cloth are coated with a coating layer with the thickness of 0.1mm by controlling the force of the scraper.
Comparative example 1
(1) 100kg of polypropylene (provided by Shanghai stone melting) with the mark of PPT300, 1kg of decabromodiphenyl ether, 1kg of antimony trioxide, 5kg of talcum powder with the particle size of 1250 meshes and 2kg of lubricant polypropylene wax are added into a high-speed mixer, the temperature of the high-speed mixer is set to be 100 ℃, the mixture is dispersed for 35min at the stirring speed of 400rpm, and then the mixture is melted and extruded by a co-rotating double-screw extruder with the length-diameter ratio of a screw being 44:1, and the mixture is extruded into a flat film by a T-shaped die of the screw extruder; five sections of heating are arranged on the co-rotating double-screw extruder, and the first section is 190 ℃; a second section of 205 ℃; a third stage of 210 ℃; a fourth stage of 215 ℃; the fifth section is 200 ℃; the extrusion temperature of the T-shaped die is 200 ℃; cooling the flat film, and cutting the flat film into blank filaments by using a blade; drawing the blank filaments 6 times in a hot air duct at 110 ℃ to obtain flat filaments with 1200 denier and 0.8mm width;
(2) twisting the 1 strand of flat yarn obtained in the step (1) and the 1 strand of glass fiber spun yarn in parallel, wherein the twist degree is 350 twist/m, and performing heat setting at 140 ℃ to obtain a gapped composite wire; the selected glass fiber spun yarn is continuous glass fiber doubling and twisting yarn, the linear density is 66dtex, 2 strands are doubled and twisted, and the twist number is 120 twists/m;
(3) weaving the composite wires obtained in the step (2) as warps and wefts according to the warps and the wefts to obtain base cloth;
(4) dispersing and stirring water glass, hollow glass microspheres and polytetrafluoroethylene emulsion uniformly in a mass ratio of 1:1:10 to form viscous dispersion, soaking the base cloth obtained in the step (3) in the dispersion for 5min, scraping the redundant dispersion on the surface of the base cloth by a scraper, drying, locking edges and rolling to obtain the durable special heat-insulating cover cloth for the electrolytic cell. The particle size of the hollow glass microspheres is 500 meshes, and the hollow glass microspheres have good heat insulation effect; the polytetrafluoroethylene emulsion is 60 wt% of high-concentration polytetrafluoroethylene aqueous phase dispersion (the commercial model is FR 301B); the two surfaces of the base cloth are respectively formed with coating layers with the thickness of 0.2mm by controlling the force of the scraper.
Comparative example 2
(1) 100kg of polypropylene (provided by Shanghai stone melting) with the mark of PPT300, 1kg of decabromodiphenyl ether, 1kg of antimony trioxide, 5kg of talcum powder with the particle size of 1250 meshes and 2kg of lubricant polypropylene wax are added into a high-speed mixer, the temperature of the high-speed mixer is set to be 100 ℃, the mixture is dispersed for 35min at the stirring speed of 400rpm, and then the mixture is melted and extruded by a co-rotating double-screw extruder with the length-diameter ratio of a screw being 44:1, and the mixture is extruded into a flat film by a T-shaped die of the screw extruder; five sections of heating are arranged on the co-rotating double-screw extruder, and the first section is 190 ℃; a second section of 205 ℃; a third stage of 210 ℃; a fourth stage of 215 ℃; the fifth section is 200 ℃; the extrusion temperature of the T-shaped die is 200 ℃; cooling the flat film, and cutting the flat film into blank filaments by using a blade; drawing the blank filaments 6 times in a hot air duct at 110 ℃ to obtain flat filaments with 1200 denier and 0.8mm width;
(2) twisting the two strands of flat yarns obtained in the step (1) together, wherein the twist is 150 twists/m, and performing heat setting at 140 ℃ to obtain a composite yarn with gaps;
(3) weaving the composite wires obtained in the step (2) as warps and wefts according to the warps and the wefts to obtain base cloth;
(4) dispersing and stirring water glass, hollow glass microspheres and polytetrafluoroethylene emulsion uniformly in a mass ratio of 1:1:10 to form viscous dispersion, soaking the base cloth obtained in the step (3) in the dispersion for 5min, scraping the redundant dispersion on the surface of the base cloth by a scraper, drying, locking edges and rolling to obtain the durable special heat-insulating cover cloth for the electrolytic cell. The particle size of the hollow glass microspheres is 500 meshes, and the hollow glass microspheres have good heat insulation effect; the polytetrafluoroethylene emulsion is 60 wt% of high-concentration polytetrafluoroethylene aqueous phase dispersion (the commercial model is FR 301B); the two surfaces of the base cloth are respectively formed with coating layers with the thickness of 0.2mm by controlling the force of the scraper.
Comparative example 3
(1) 100kg of polypropylene (provided by Shanghai stone melting) with the mark of PPT300, 1kg of decabromodiphenyl ether, 1kg of antimony trioxide, 5kg of talcum powder with the particle size of 1250 meshes and 2kg of lubricant polypropylene wax are added into a high-speed mixer, the temperature of the high-speed mixer is set to be 100 ℃, the mixture is dispersed for 35min at the stirring speed of 400rpm, and then the mixture is melted and extruded by a co-rotating double-screw extruder with the length-diameter ratio of a screw being 44:1, and the mixture is extruded into a flat film by a T-shaped die of the screw extruder; five sections of heating are arranged on the co-rotating double-screw extruder, and the first section is 190 ℃; a second section of 205 ℃; a third stage of 210 ℃; a fourth stage of 215 ℃; the fifth section is 200 ℃; the extrusion temperature of the T-shaped die is 200 ℃; cooling the flat film, and cutting the flat film into blank filaments by using a blade; drawing the blank filaments 6 times in a hot air duct at 110 ℃ to obtain flat filaments with 1200 denier and 0.8mm width;
(2) twisting the 1 strand of flat yarn obtained in the step (1) and the 1 strand of glass fiber spun yarn in parallel, wherein the twist degree is 150 twists per meter, and performing heat setting at 140 ℃ to obtain a gapped composite wire; the selected glass fiber spun yarn is continuous glass fiber doubling and twisting yarn, the linear density is 66dtex, 2 strands are doubled and twisted, and the twist number is 120 twists/m;
(3) weaving the composite wires obtained in the step (2) as warps and wefts according to the warps and the wefts to obtain base cloth;
(4) dispersing and stirring the hollow glass microspheres and the polytetrafluoroethylene emulsion uniformly in a mass ratio of 1:1:10 to form viscous dispersion liquid, soaking the base cloth obtained in the step (3) in the dispersion liquid for 5min, scraping off the redundant dispersion liquid on the surface of the base cloth by a scraper, drying, locking edges, and coiling to obtain the durable special insulation cover cloth for the electrolytic cell. The particle size of the hollow glass microspheres is 500 meshes, and the hollow glass microspheres have good heat insulation effect; the polytetrafluoroethylene emulsion is 60 wt% of high-concentration polytetrafluoroethylene aqueous phase dispersion (the commercial model is FR 301B); the two surfaces of the base cloth are respectively formed with coating layers with the thickness of 0.2mm by controlling the force of the scraper.
Referring to the GB/T3139-.
The electrolytic tank covering cloth prepared in batches of the implementation 1-3 and the comparative examples 1-3 is used for the tank car covering cloth for electrolytic copper, and the working condition of the electrolytic copper of the electrolytic tank of a customer is as follows: the concentration of copper ions is 40-45 g/L; the concentration of the circulating sulfuric acid is 170 g/L; the temperature of the solution is 60-65 ℃. The average amount of steam consumed per ton of cathode copper for normal use is shown in table 1. The drape was used as described in table 1.
Table 1:
through tests, the invention twists the polypropylene flat filaments and the glass fiber spun yarns, and the hollow glass microspheres are easy to remain in the gaps through the more remaining twisting gaps, thereby overcoming the problems that the plastic cover cloth coating of the current electrolytic cell is easy to fall off and age, and the cover cloth of the electrolytic cell has the characteristics of durability and heat preservation, is particularly used for covering the electrolytic cell, can preserve heat and reduce the steam consumption of the cell.
Comparative example 1 adopts 1 strand of flat filament and 1 strand of glass fiber spun yarn to be twisted together, the twist is 350 twist/m, the gap of the formed composite wire is less due to higher twist, the performance in the aspect of retaining the hollow microspheres is poorer, and the obtained electrolytic bath cover cloth is used for a long time and is easy to cause the falling off of the hollow microspheres after being folded.
Comparative example 2 does not twist the flat yarn and the glass fiber spun yarn, and thus the composite wire obtained has hollow glass microspheres residing with gaps, but the hollow glass microspheres are easily detached because the glass fiber spun yarn is lacking, the adhesion between the sodium silicate inorganic binder and the flat yarn is poor, and it is difficult to effectively adhere the hollow glass microspheres to the flat yarn.
Comparative example 3 no water glass was added to the viscous dispersion, the hollow glass microspheres were adhered to the base cloth and formed a protective layer only by virtue of the adhesiveness of the polytetrafluoroethylene emulsion, the polytetrafluoroethylene coating had poor bondability to the base cloth despite its good acid resistance, and the coating was easily peeled off from the base cloth under the action of continuous lifting, folding, and the like.
In light of the foregoing description of the preferred embodiment of the present invention, it is to be understood that various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (9)
1. A preparation method of a special heat-preservation cover cloth for a durable electrolytic cell is characterized by comprising the following steps:
(1) adding polypropylene, a flame retardant, an inorganic filler and a lubricant into a high-speed mixer, uniformly dispersing, then carrying out melt extrusion through a screw extruder, and extruding into a flat film through a T-shaped die head of the screw extruder; cutting the flat film into blank filaments by a blade; drawing the blank filament 6-8 times in a hot air channel at 110 ℃ to obtain a flat filament with 1000-1200 denier;
(2) twisting the flat filaments obtained in the step (1) and the glass fiber spun yarns together, and performing heat setting at 140-145 ℃ to obtain composite wires with gaps; the doubling twist is that the doubling twist degree of 1 strand of flat yarn and 1 strand of glass fiber spun yarn is 150 and 200 twisting/m;
(3) weaving the composite wires obtained in the step (2) as warps and wefts according to the warps and the wefts to obtain base cloth;
(4) adding water glass and hollow glass microspheres into the polytetrafluoroethylene emulsion, uniformly stirring to form viscous dispersion, soaking the base cloth obtained in the step (3) in the dispersion for 5-10min, scraping off the redundant dispersion on the surface of the base cloth by a scraper, drying, locking edges, and coiling to obtain the durable special insulation cover cloth for the electrolytic cell.
2. The method for preparing the durable cover cloth special for the electrolytic bath according to claim 1, wherein the method comprises the following steps: the polypropylene, the flame retardant, the inorganic filler and the lubricant in the step (1) are prepared by weight parts, wherein 80-100 parts of polypropylene, 1-2 parts of flame retardant, 3-8 parts of inorganic filler and 1-3 parts of lubricant.
3. The method for preparing the durable cover cloth special for the electrolytic bath according to claim 1, wherein the method comprises the following steps: in the step (1), the polypropylene is selected to have the brands of PPT300 and PPF 401; the flame retardant is one of decabromodiphenyl ether, tetrabromobisphenol A, octabromoether, octabromobis S ether and TBC; the inorganic filler is at least one of talcum powder, wollastonite powder, barium sulfate powder and montmorillonite powder, and the particle size is required to be 1250 meshes; the lubricant is at least one of polypropylene wax, polyethylene wax, stearic acid and paraffin wax.
4. The method for preparing the durable cover cloth special for the electrolytic bath according to claim 1, wherein the method comprises the following steps: the screw extruder in the step (1) is a co-rotating double-screw extruder, and the length-diameter ratio of the screws is 40-48: 1.
5. The method for preparing the durable cover cloth special for the electrolytic bath according to claim 1, wherein the method comprises the following steps: the width of the flat wire in the step (1) is 0.5-0.8 mm.
6. The method for preparing the durable cover cloth special for the electrolytic bath according to claim 1, wherein the method comprises the following steps: in the step (2), the glass fiber spun yarn is continuous glass fiber doubling and twisting yarn, the linear density is 66dtex, 2 strands are doubled and twisted, and the twist is 100-120 twist/meter.
7. The method for preparing the durable cover cloth special for the electrolytic bath according to claim 1, wherein the method comprises the following steps: dispersing the water glass, the hollow glass microspheres and the polytetrafluoroethylene emulsion in the step (4) according to the mass ratio of 1:1-3: 10-15; the particle size of the hollow glass microspheres is selected to be 500-mesh sieved; the polytetrafluoroethylene emulsion is 60 wt% of high-concentration polytetrafluoroethylene aqueous phase dispersion liquid.
8. The method for preparing the durable cover cloth special for the electrolytic bath according to claim 1, wherein the method comprises the following steps: in the step (4), the thickness of the coating on the two sides of the base cloth is 0.1-0.2mm by the scraper.
9. A durable cell-specific drape made by the method of any one of claims 1-8.
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| PCT/CN2021/098404 WO2022052528A1 (en) | 2020-09-12 | 2021-06-04 | Durable thermal-insulation covering fabric specialized for electrolytic tank and preparation method therefor |
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