WO2022052528A1 - 一种耐久性电解槽专用保温盖布及制备方法 - Google Patents

一种耐久性电解槽专用保温盖布及制备方法 Download PDF

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Publication number
WO2022052528A1
WO2022052528A1 PCT/CN2021/098404 CN2021098404W WO2022052528A1 WO 2022052528 A1 WO2022052528 A1 WO 2022052528A1 CN 2021098404 W CN2021098404 W CN 2021098404W WO 2022052528 A1 WO2022052528 A1 WO 2022052528A1
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thermal insulation
durable
insulation cover
glass fiber
special thermal
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PCT/CN2021/098404
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English (en)
French (fr)
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杨熠
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浙江省天台天峰滤料有限公司
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Publication of WO2022052528A1 publication Critical patent/WO2022052528A1/zh

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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/0002—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
    • D06N3/0006—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 woven fabrics
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • 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
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • 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
    • D01F1/10—Other agents for modifying properties
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
    • 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
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/0002—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
    • 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
    • D06N3/0022—Glass fibres
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/0002—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
    • 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
    • D06N3/0038—Polyolefin fibres
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/0086—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the application technique
    • D06N3/0088—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the application technique by directly applying the resin
    • D—TEXTILES; PAPER
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    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/04—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D06N3/047—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds with fluoropolymers
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N2205/00—Condition, form or state of the materials
    • D06N2205/10—Particulate form, e.g. powder, granule
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    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N2209/00—Properties of the materials
    • D06N2209/06—Properties of the materials having thermal properties
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    • D06N2209/00—Properties of the materials
    • D06N2209/06—Properties of the materials having thermal properties
    • D06N2209/067—Flame resistant, fire resistant
    • D—TEXTILES; PAPER
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    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N2209/00—Properties of the materials
    • D06N2209/14—Properties of the materials having chemical properties
    • D06N2209/143—Inert, i.e. inert to chemical degradation, corrosion resistant
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    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
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    • D06N2209/16—Properties of the materials having other properties
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    • D06N2209/00—Properties of the materials
    • D06N2209/16—Properties of the materials having other properties
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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
    • D06N3/0056—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the compounding ingredients of the macro-molecular coating
    • D06N3/0063—Inorganic compounding ingredients, e.g. metals, carbon fibres, Na2CO3, metal layers; Post-treatment with inorganic compounds

Definitions

  • the invention belongs to the field of industrial electrolytic cell refining, in particular to the technology of protective cover cloth for the accessories of the electrolytic tank, in particular to a special thermal insulation cover cloth for durable electrolytic tanks and a preparation method.
  • the electrolytic cell is the key link of refining, and there is a huge space in ensuring quality, reducing costs and maintaining the environment.
  • steam needs to be used to heat up the electrolyte and wash the cathode and anode.
  • the current efficiency can be improved and the cell voltage can be reduced, but when the temperature is higher than 70 °C, the acid mist will evaporate. The amount increases and the working environment deteriorates.
  • the electrolytic cell covering cloth is a woven cloth made of insulating and flame-retardant sheet plastic strips as the warp and weft lines orthogonally woven.
  • the upper and lower surfaces are respectively provided with a layer of sealing and resistant
  • the acid-base film layer which not only maintains heat, but also resists acid mist, has been widely used in the cover cloth of electrolytic copper electrolytic cells.
  • the durability of the existing plastic woven covers in a long-term acid mist environment is still insufficient, and the thermal insulation effect is not as good as that of thermal insulation boards, glass fiber reinforced plastics and other cover boards.
  • the existing plastic woven cover has been used on the surface of the electrolytic cell for a long time, the woven cloth is easily damaged, the acid and alkali resistant layer is easy to fall off, falls into the electrolytic cell, and is directly mixed with the finished cathode copper.
  • the present invention proposes a special thermal insulation cover for a durable electrolytic cell; further, a preparation method of the special thermal insulation cover for an electrolytic cell is specifically disclosed.
  • the present invention first provides a preparation method of a special thermal insulation cover for a durable electrolytic cell, characterized in that the specific preparation method is as follows:
  • step (2) twisting the flat yarn and glass fiber spun yarn obtained in step (1) in parallel, and heat-setting at 140-145° C. to obtain a composite yarn with gaps;
  • step (3) the composite thread obtained in step (2) is woven according to the warp and weft as the warp and the weft to obtain the base cloth;
  • the polypropylene, flame retardant, inorganic filler and lubricant described in step (1) are prepared in parts by weight, specifically 80-100 parts of polypropylene, 1-2 parts of flame retardant, 3-3 parts of inorganic filler 8 parts and 1-3 parts of lubricant;
  • the polypropylene is selected from polypropylene suitable for wire drawing, and the specific preferred grades are PPT300 and PPF401;
  • the flame retardant is selected from conventional plastic flame retardants, such as decabromodiphenyl ether , tetrabromobisphenol A, octabromobisphenol A, octabromobisphenol ether, octabromobisphenol ether, TBC, or directly use mature flame retardant masterbatch for the convenience of use, especially preferably decabromodiphenyl ether and antimony trioxide in a mass ratio of 1:1 Compound flame retardant;
  • the inorganic filler is selected from at least one of talc powder, wollastonite powder,
  • the screw extruder in step (1) is a co-rotating twin-screw extruder, and the further preferred screw length-diameter ratio is 40-48:1, and the co-rotating twin-screw extruder has good shear dispersion.
  • the higher aspect ratio is conducive to the uniform dispersion of the material, which is conducive to the extrusion of a uniform flat film.
  • the temperature setting of the screw extruder in step (1) is controlled at 190-220°C.
  • the width of the flat wire in step (1) is 0.5-0.8 mm.
  • the glass fiber spun yarn in step (2) is a continuous glass fiber twisted yarn with a linear density of 66 dtex, two parallel twists, and a twist of 100-120 twists/meter.
  • the parallel twist in step (2) is 1 strand of flat yarn and 1 strand of glass fiber spun yarn with a twist of 150-200 twists/m, and the flat yarn and glass fiber spun yarn are twisted into a composite with gaps through the parallel twist. If the twist is too high, the intermittence of the composite yarn is small and small, and it is difficult to immerse in the dispersion liquid. If the twist is too low, the composite effect of the flat yarn and the glass fiber spun yarn will be affected.
  • step (4) the water glass, hollow glass microspheres, and polytetrafluoroethylene emulsion are dispersed in a mass ratio of 1:1-3:10-15.
  • the water glass in step (4) has good adhesion, especially good adhesion with inorganic substances
  • the flat yarn in the base fabric is twisted with glass fiber spun yarn, and the glass fiber and water glass have a strong affinity
  • the adhesiveness makes the water glass and the base cloth firmly bonded, and the water glass bonding is resistant to high temperature and acid corrosion.
  • the particle size is small.
  • the polytetrafluoroethylene emulsion is a 60wt% high-concentration polytetrafluoroethylene aqueous phase dispersion (commercially available model is FR301B), and a viscous dispersion is obtained by adding water glass and hollow glass microspheres, and the dispersion is in When soaking the base cloth, the affinity of water glass and glass fiber makes the hollow microspheres better reside in the gaps between the flat yarn and the glass fiber spun yarn, as well as the gaps and surfaces of the base cloth, so that the hollow glass microspheres are not easy to be used.
  • the dispersion is viscous, and by controlling the force of the scraper, a dispersion coating of a certain thickness is formed on the two surfaces of the base cloth; the preferred coating thickness on both sides of the base cloth is 0.1-0.2mm.
  • the present invention provides a special thermal insulation cover for a durable electrolytic cell prepared by the above method.
  • the present invention first prepares polypropylene flat yarn, twists the flat yarn and glass fiber spun yarn into a composite wire, and uses the The composite thread is woven according to the warp and weft as the warp and weft to obtain the base fabric; the base fabric is treated with the dispersion liquid configured by water glass, hollow glass microspheres and polytetrafluoroethylene emulsion.
  • the water glass and glass fiber have good affinity and adhesion, so that the hollow glass microspheres adhere to the gaps, not only the cover cloth has a good thermal insulation effect, but also is not easy to fall off, has good durability, and effectively prevents the corrosion of acid mist in the electrolytic cell. .
  • the present invention reasonably introduces the inorganic hollow glass spheres into the cover cloth of the electrolytic cell, and solves the problems of poor heat preservation and poor durability of the current cover cloth of the electrolytic cell.
  • the present invention twists the polypropylene flat yarn and the glass fiber spun yarn, so that the hollow glass microspheres are easily retained in the gap by retaining more twisting gaps, overcoming It solves the problems that the current electrolytic cell plastic cover coating is easy to fall off and easy to age.
  • the present invention combines inorganic-organic effectively, and the obtained electrolytic cell cover cloth has the characteristics of durability and heat preservation, and the coating formed by the inorganic adhesive effectively protects the base cloth from being corroded by acid, and prolongs the service life of the cover cloth.
  • the electrolytic cell cover cloth prepared by the present invention is flexible and lightweight, and is especially suitable for use in the electrolytic copper process.
  • Fig. 1 is a schematic diagram of a composite thread with gaps obtained by twisting the flat yarn and the glass fiber spun yarn in the process of preparing a special thermal insulation cover for a durable electrolytic cell of the present invention; in the figure: 1-glass fiber spun yarn; 2-flat yarn.
  • the extrusion is flat film; the co-rotating twin-screw extruder is set with five heating stages, the first stage is 190°C; the second stage is 205°C; the third stage is 210°C; the fourth stage is 215°C; the fifth stage is 200°C;
  • the extrusion temperature of the T-die head is 200°C; the flat film is cooled and cut with a blade into billets; the billets are stretched 6 times in a hot air duct at 110°C to obtain 1200 denier flat yarns with a width of 0.8mm;
  • step (2) 1 strand of flat yarn obtained in step (1) and 1 strand of glass fiber spun yarn are twisted in parallel, and the twist is 150 twists/meter, and heat-setting at 140 DEG C to obtain a composite thread with gaps; as shown in the accompanying drawings, 1 in the figure 2 is a glass fiber spun yarn; 2 is a flat yarn; the selected glass fiber spun yarn is a continuous glass fiber twisted yarn with a linear density of 66dtex, which is twisted by 2 strands, and the twist is 120 twists/meter. (3) the composite thread obtained in step (2) is woven according to the warp and weft as the warp and the weft to obtain the base cloth;
  • the particle size of the hollow glass microspheres passes through a 500-mesh sieve, and the hollow glass microspheres have a good thermal insulation effect;
  • the polytetrafluoroethylene emulsion is a high-concentration polytetrafluoroethylene aqueous phase dispersion of 60wt% (commercially available model is FR301B);
  • FR301B polytetrafluoroethylene aqueous phase dispersion of 60wt%
  • the extrusion is flat film; the co-rotating twin-screw extruder is set with five heating stages, the first stage is 190°C; the second stage is 205°C; the third stage is 210°C; the fourth stage is 215°C; the fifth stage is 200°C;
  • the extrusion temperature of the T-die head is 200°C; the flat film is cooled and cut with a blade into billets; the billets are stretched 6 times in a hot air duct at 110°C to obtain 1200 denier flat yarns with a width of 0.8mm;
  • step (2) 1 strand of flat yarn obtained in step (1) and 1 strand of glass fiber spun yarn are twisted together, and the twist is 200 twists/meter, and heat-setting at 140 DEG C is performed to obtain a composite thread with gaps;
  • the selected glass fiber spun yarn is continuous Glass fiber twisted yarn, the linear density is 66dtex, it is twisted by 2 strands, and the twist is 120 twists/m;
  • step (3) the composite thread obtained in step (2) is woven according to the warp and weft as the warp and the weft to obtain the base cloth;
  • the particle size of the hollow glass microspheres is selected to pass a 500-mesh sieve, and the hollow glass microspheres have a good heat insulation effect;
  • the polytetrafluoroethylene emulsion is a high-concentration polytetrafluoroethylene aqueous phase dispersion of 60wt% (commercially available model is FR301B) ;
  • the two surfaces of the base cloth are formed with a coating with a thickness of 0.2mm.
  • the head is extruded as a flat film; the co-rotating twin-screw extruder is set with five stages of heating, the first stage is 200°C; the second stage is 205°C; the third stage is 215°C; the fourth stage is 220°C; the fifth stage is 200°C ;
  • the extrusion temperature of the T-die head is 200°C; the flat film is cooled and cut with a blade into blanks; the blanks are stretched 8 times in a hot air duct at 110°C to obtain 1000 denier, 0.5mm wide flat yarns;
  • step (1) 1 strand of flat yarn obtained in step (1) and 1 strand of glass fiber spun yarn are twisted in parallel, and the twist is 1500 twists/meter, and heat-setting at 140 ° C is performed to obtain a composite thread with gaps;
  • the selected glass fiber spun yarn is continuous Glass fiber twisted yarn, the linear density is 66dtex, it is twisted by 2 strands, and the twist is 100 twists/m;
  • step (3) the composite thread obtained in step (2) is woven according to the warp and weft as the warp and the weft to obtain the base cloth;
  • the particle size of the hollow glass microspheres is selected to pass a 500-mesh sieve, and the hollow glass microspheres have a good heat insulation effect;
  • the polytetrafluoroethylene emulsion is a high-concentration polytetrafluoroethylene aqueous phase dispersion of 60wt% (commercially available model is FR301B) ;
  • the two surfaces of the base cloth are formed with a coating thickness of 0.1mm.
  • the extrusion is flat film; the co-rotating twin-screw extruder is set with five heating stages, the first stage is 190°C; the second stage is 205°C; the third stage is 210°C; the fourth stage is 215°C; the fifth stage is 200°C;
  • the extrusion temperature of the T-die head is 200°C; the flat film is cooled and cut with a blade into billets; the billets are stretched 6 times in a hot air duct at 110°C to obtain 1200 denier flat yarns with a width of 0.8mm;
  • step (1) 1 strand of flat yarn obtained in step (1) and 1 strand of glass fiber spun yarn are twisted in parallel, and the twist is 350 twists/meter, and heat-setting at 140 ° C is performed to obtain a composite thread with gaps;
  • the selected glass fiber spun yarn is continuous Glass fiber twisted yarn, the linear density is 66dtex, it is twisted by 2 strands, and the twist is 120 twists/m;
  • step (3) the composite thread obtained in step (2) is woven according to the warp and weft as the warp and the weft to obtain the base cloth;
  • the particle size of the hollow glass microspheres passes through a 500-mesh sieve, and the hollow glass microspheres have a good thermal insulation effect;
  • the polytetrafluoroethylene emulsion is a high-concentration polytetrafluoroethylene aqueous phase dispersion of 60wt% (commercially available model is FR301B);
  • FR301B polytetrafluoroethylene aqueous phase dispersion of 60wt%
  • the extrusion is flat film; the co-rotating twin-screw extruder is set with five heating stages, the first stage is 190°C; the second stage is 205°C; the third stage is 210°C; the fourth stage is 215°C; the fifth stage is 200°C;
  • the extrusion temperature of the T-die head is 200°C; the flat film is cooled and cut with a blade into billets; the billets are stretched 6 times in a hot air duct at 110°C to obtain 1200 denier flat yarns with a width of 0.8mm;
  • step (2) the two flat yarns obtained in step (1) are twisted in parallel, with a twist of 150 twists/meter, and heat-setting at 140° C. to obtain a composite wire with a gap;
  • step (3) the composite thread obtained in step (2) is woven according to the warp and weft as the warp and the weft to obtain the base cloth;
  • the particle size of the hollow glass microspheres passes through a 500-mesh sieve, and the hollow glass microspheres have a good thermal insulation effect;
  • the polytetrafluoroethylene emulsion is a high-concentration polytetrafluoroethylene aqueous phase dispersion of 60wt% (commercially available model is FR301B);
  • FR301B polytetrafluoroethylene aqueous phase dispersion of 60wt%
  • the extrusion is flat film; the co-rotating twin-screw extruder is set with five heating stages, the first stage is 190°C; the second stage is 205°C; the third stage is 210°C; the fourth stage is 215°C; the fifth stage is 200°C;
  • the extrusion temperature of the T-die head is 200°C; the flat film is cooled and cut with a blade into billets; the billets are stretched 6 times in a hot air duct at 110°C to obtain 1200 denier flat yarns with a width of 0.8mm;
  • step (2) 1 strand of flat yarn obtained in step (1) and 1 strand of glass fiber spun yarn are twisted in parallel, and the twist is 150 twists/meter, and heat-setting at 140 ° C is performed to obtain a composite thread with gaps;
  • the selected glass fiber spun yarn is continuous Glass fiber twisted yarn, the linear density is 66dtex, it is twisted by 2 strands, and the twist is 120 twists/m;
  • step (3) the composite thread obtained in step (2) is woven according to the warp and weft as the warp and the weft to obtain the base cloth;
  • the particle size of the hollow glass microspheres passes through a 500-mesh sieve, and the hollow glass microspheres have a good thermal insulation effect;
  • the polytetrafluoroethylene emulsion is a high-concentration polytetrafluoroethylene aqueous phase dispersion of 60wt% (commercially available model is FR301B);
  • FR301B polytetrafluoroethylene aqueous phase dispersion of 60wt%
  • the electrolytic cell covers prepared in batches 1-3 and 1-3 were used for the tank car covers of electrolytic copper.
  • the working conditions of the customer's electrolytic cell for electrolytic copper copper ion concentration 40-45g/L; circulating sulfuric acid Concentration 170g/L; solution temperature 60-65°C.
  • the average steam consumption per ton of cathode copper under normal use is shown in Table 1.
  • the use of the drape is described in Table 1.
  • the present invention twists polypropylene flat yarn and glass fiber spun yarn, and keeps the hollow glass microspheres easily in the gap by retaining more twisting gaps, which overcomes the current electrolytic cell plastic cover coating that is easy to fall off and easy to age.
  • the cover cloth of the electrolytic cell has the characteristics of durability and heat preservation. It can be covered on the specific use of the electrolytic cell, which can keep the heat and reduce the steam consumption of the cell.
  • Comparative Example 1 1 strand of flat yarn and 1 strand of glass fiber spun yarn were used for twisting, and the twist was 350 twists/m. Due to the high twist, the gap of the formed composite thread was less, and the performance of resident hollow microspheres was poor. The long-term use and folding of the cover cloth of the electrolytic cell will easily cause the hollow microspheres to fall off.
  • Comparative Example 3 no water glass was added to the viscous dispersion, and the hollow glass microspheres were adhered to the base cloth and formed a protective layer only by the adhesiveness of the polytetrafluoroethylene emulsion.
  • the polytetrafluoroethylene coating has good Acid resistance, but poor bonding with the base fabric, the coating is easy to peel off from the base fabric under the action of continuous lifting and folding.

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Abstract

提供一种耐久性电解槽专用保温盖布及制备方法，首先制备聚丙烯扁丝，将扁丝与玻璃纤维细纱捻制为复合线，以该复合线作为经线和纬线按照经纬编制，得到基布；并用水玻璃、空心玻璃微球、聚四氟乙烯乳液配置的分散液处理基布，由于基布的扁丝与玻璃纤维细纱存在空隙，水玻璃与玻璃纤维亲和性、粘接性良好，从而使空心玻璃微球粘接驻留在空隙，不但是盖布保温效果良好，而且不易脱落，耐久性好，有效防止电解槽的酸雾侵蚀。

Description

一种耐久性电解槽专用保温盖布及制备方法 技术领域
本发明属于工业电解槽精炼领域，具体涉及电解槽附件防护盖布技术，特别涉及一种耐久性电解槽专用保温盖布及制备方法。
背景技术
随着冶炼技术的逐步精细化，在各个环节进行节能和优化是目前冶炼企业降成本、降损耗的关键。在铜电解的生产过程中，电解槽作为精炼的关键环节，在保证品质、降低成本、维护环境方面存在巨大的空间。如在铜电解过程中，需要将蒸汽用于电解液的升温和阴极、阳极的洗烫，在较高温度作业时可提高电流效率和降低槽电压，但温度高于70℃时，酸雾蒸发量增大，作业环境恶化。为了防止电解槽面的热散失和防止酸雾扩散，保护操作环境，需要进行防热散失和耐腐蚀的处理措施。如常用的保温盖板、玻璃钢盖板等。但保温盖板、玻璃钢盖板由于厚重，成本高，频繁掀开盖观察困难，特别是在多槽并列使用时，给操作造成较大的困难。目前逐步由低成本的盖布取代。如利用塑料编织布，不但成本低，而且掀盖方便。
中国实用新型专利公开号CN204198881U公开了电解槽覆盖布，该电解槽盖布是以绝缘且阻燃的片状塑料条作为经纬线正交编织成的编织布的上下表面分别设置有一层密封且耐酸碱的薄膜层，其不但保温，而且耐酸雾，在电解铜的电解槽盖布中得到了广泛的使用。
然而，现有塑料编织盖布在长时间酸雾环境下的耐久性还存在不足，保温效果没有保温板、玻璃钢等盖板性能优异。如现有塑料编织盖布在电解槽槽面使用时间久了，编织布易破损，耐酸碱层易脱落，掉入电解槽内，直接混杂于成品阴极铜中。
发明内容
针对目前塑料编织布用于电解槽盖布耐久性差，保温效果不足的问题，本 发明提出一种耐久性电解槽专用保温盖布；进一步，具体公开了该电解槽专用保温盖布的制备方法。
为实现上述技术效果，本发明首先提供一种耐久性电解槽专用保温盖布的制备方法，其特征在于，具体制备方法如下：
(1)将聚丙烯、阻燃剂、无机填料、润滑剂加入高速混合机分散均匀，然后经螺杆挤出机熔融挤出，通过螺杆挤出机的T型模头挤出为平膜；将平膜用刀片切割为坯丝；坯丝进110℃的热风道拉伸6-8倍，得到1000-1200旦的扁丝；
(2)将步骤(1)得到的扁丝与玻璃纤维细纱并捻，经140-145℃热定型，得到有间隙的复合线；
(3)将步骤(2)得到的复合线作为经线和纬线按照经纬编制，得到基布；
(4)将水玻璃、空心玻璃微球加入聚四氟乙烯乳液搅拌均匀形成粘稠分散液，将步骤(3)得到的基布浸泡在分散液5-10min，然后经刮板刮除基布表面多余分散液，干燥，锁边，卷取，得到一种耐久性电解槽专用保温盖布。
优选的，步骤(1)中所述聚丙烯、阻燃剂、无机填料、润滑剂以重量份进行配制，具体的选用聚丙烯80-100份、阻燃剂1-2份、无机填料3-8份、润滑剂1-3份；其中，所述聚丙烯选用适合拉丝的聚丙烯，具体的优选牌号有PPT300、PPF401；所述阻燃剂选用塑料常规阻燃剂，如十溴二苯醚、四溴双酚A、八溴醚、八溴双S醚、TBC，或者为了使用方便直接使用成熟的阻燃母料，特别优选十溴二苯醚与三氧化二锑以质量比1∶1复配的阻燃剂；所述无机填料选用滑石粉、硅灰石粉、硫酸钡粉、蒙脱石粉中的至少一种，要求粒径为1250目；所述润滑剂为聚丙烯蜡、聚乙烯蜡、硬脂酸、石蜡中的至少一种。
优选的，步骤(1)中所述螺杆挤出机为同向双螺杆挤出机，进一步优选的螺杆长径比为40-48∶1，同向双螺杆挤出机具有良好的剪切分散性，配合较高的长径比有利于物料的均匀分散，从而利于挤出均匀的平膜。
优选的，步骤(1)中所述螺杆挤出机的温度设置控制在190-220℃。
优选的，步骤(1)中所述扁丝的宽度为0.5-0.8mm。
优选的，步骤(2)中所述玻璃纤维细纱为连续玻璃纤维并捻纱，线密度为66dtex，2股并捻，捻度为100-120捻/米。
优选的，步骤(2)中所述并捻为1股扁丝与1股玻璃纤维细纱并捻捻度为150-200捻/米，通过并捻使扁丝与玻璃纤维细纱捻为存在间隙的复合线，捻度过高复合线间歇小而少，难以浸入分散液，捻度过低会影响扁丝与玻璃纤维细纱的复合效果。
优选的，步骤(4)中所述水玻璃、空心玻璃微球、聚四氟乙烯乳液以质量比1∶1-3∶10-15分散。
优选的，步骤(4)中所述水玻璃具有良好的粘接性，尤其是与无机物粘接性良好，基布中扁丝与玻璃纤维细纱捻制，玻璃纤维与水玻璃强力的亲和粘接性使得水玻璃与基布粘接牢固，而且水玻璃粘接耐高温，耐酸蚀；所述空心玻璃微球的粒径选用过500目筛，空心玻璃微球具有良好的隔热作用，粒径较小，通过填充在基布扁丝与玻璃纤维细纱的空隙间和基布表面，在硅酸钠和聚四氟乙烯乳液粘接作用下牢固附着，不易脱落，赋予基布良好的保温效果；所述聚四氟乙烯乳液为60wt％的高浓度聚四氟乙烯水相分散液(市售型号为FR301B)，通过加入水玻璃和空心玻璃微球得到粘稠的分散液，分散液在浸泡基布时，水玻璃与玻璃纤维的亲和性使空心微球较好的驻留在粘接在扁丝与玻璃纤维细纱的空隙以及基布的空隙和表面，从而使得空心玻璃微球不易脱落，耐久性好；同时分散液粘稠，通过控制刮刀力度是基布的两个表面形成一定厚度的分散液涂层；较佳的基布两面的涂层厚度为0.1-0.2mm。
再者，本发明提供由上述方法制备得到的一种耐久性电解槽专用保温盖布。为了解决目前以聚丙烯塑料材质编织布用于电解槽盖布耐久性差，保温效果不足的问题，本发明首先制备了聚丙烯扁丝，将扁丝与玻璃纤维细纱捻制为复合线，以该复合线作为经线和纬线按照经纬编制，得到基布；并将水玻璃、空心玻璃微球、聚四氟乙烯乳液配置的分散液处理基布，由于基布的扁丝与玻璃纤维细纱存在空隙，水玻璃与玻璃纤维亲和性粘接性良好，从而使空心玻璃微 球粘接驻留在空隙，不但是盖布保温效果良好，而且不易脱落，耐久性好，有效防止电解槽的酸雾侵蚀。
本发明一种耐久性电解槽专用保温盖布及制备方法，与现有电解槽盖布相比，其突出的特点和显著的进步在于：
(1)本发明将无机空心玻璃球合理的引入了电解槽盖布，解决了目前电解槽盖布保温性差、耐久性差的问题。
(2)针对空隙玻璃微球不易于塑料盖布结合的问题，本发明将聚丙烯扁丝与玻璃纤维细纱捻制，通过留存较多的捻制间隙使空心玻璃微球易于在间隙留存，克服了目前电解槽塑料盖布涂层易脱落、易老化的问题。
(3)本发明将无机-有机有效结合，得到的电解槽盖布具备耐久、保温特性，无机粘接剂形成的涂层有效保护基布不被酸腐蚀，延长了盖布的使用寿命。
(4)本发明制备的电解槽盖布柔韧、轻便，特别适合在电解铜过程中使用，不但起到了保温节能，净化环境的作用，也为电解铜企业大幅节约成本。
附图说明
以下结合附图对本发明的技术方案进一步说明：
图1是本发明一种耐久性电解槽专用保温盖布制备过程中，扁丝与玻璃纤维细纱并捻，得到有间隙的复合线示意图；图中：1-玻璃纤维细纱；2-扁丝。
具体实施方式
为了使本技术领域的人员更好地理解本发明方案，下面将结合本发明实施例，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分的实施例，而不是全部的实施例。基于本发明的技术思路，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都应当属于本发明保护的范围。
实施例1
(1)将牌号为PPT300的聚丙烯(由上海石化提供)100kg、十溴二苯醚1kg、三氧化二锑1kg、粒径为1250目的滑石粉5kg、润滑剂聚丙烯蜡2kg加入高速 混合机，设置高速混合机温度为100℃，在400rpm搅拌转速下分散35min，然后经螺杆长径比为44∶1的同向双螺杆挤出机熔融挤出，通过螺杆挤出机的T型模头挤出为平膜；同向双螺杆挤出机设置五段加热，分别为第一段190℃；第二段205℃；第三段210℃；第四段215℃；第五段200℃；T型模头挤出温度为200℃；将平膜冷却后用刀片切割为坯丝；坯丝进110℃的热风道拉伸6倍，得到1200旦、宽度为0.8mm的扁丝；
(2)将步骤(1)得到的1股扁丝与1股玻璃纤维细纱并捻，捻度为150捻/米，经140℃热定型，得到有间隙的复合线；如附图，图中1为玻璃纤维细纱；2为扁丝；选用的玻璃纤维细纱为连续玻璃纤维并捻纱，线密度为66dtex，由2股并捻，捻度为120捻/米。(3)将步骤(2)得到的复合线作为经线和纬线按照经纬编制，得到基布；
(4)将水玻璃、空心玻璃微球、聚四氟乙烯乳液以质量比1∶1∶10分散搅拌均匀形成粘稠分散液，将步骤(3)得到的基布浸泡在分散液5min，然后经刮板刮除基布表面多余分散液，干燥，锁边，卷取，得到一种耐久性电解槽专用保温盖布。空心玻璃微球的粒径过500目筛，空心玻璃微球具有良好的隔热作用；聚四氟乙烯乳液为60wt％的高浓度聚四氟乙烯水相分散液(市售型号为FR301B)；通过控制刮刀力度使基布的两个表面分别形成厚度0.2mm的涂层。
实施例2
(1)将牌号为PPT300的聚丙烯(由上海石化提供)100kg、十溴二苯醚1kg、三氧化二锑1kg、粒径为1250目的滑石粉5kg、润滑剂聚丙烯蜡2kg加入高速混合机，设置高速混合机温度为100℃，在400rpm搅拌转速下分散35min，然后经螺杆长径比为44∶1的同向双螺杆挤出机熔融挤出，通过螺杆挤出机的T型模头挤出为平膜；同向双螺杆挤出机设置五段加热，分别为第一段190℃；第二段205℃；第三段210℃；第四段215℃；第五段200℃；T型模头挤出温度为200℃；将平膜冷却后用刀片切割为坯丝；坯丝进110℃的热风道拉伸6倍，得到1200旦、宽度为0.8mm的扁丝；
(2)将步骤(1)得到的1股扁丝与1股玻璃纤维细纱并捻，捻度为200捻/米，经140℃热定型，得到有间隙的复合线；选用的玻璃纤维细纱为连续玻璃纤维并捻纱，线密度为66dtex，由2股并捻，捻度为120捻/米；
(3)将步骤(2)得到的复合线作为经线和纬线按照经纬编制，得到基布；
(4)将水玻璃、空心玻璃微球、聚四氟乙烯乳液以质量比1∶1∶10分散搅拌均匀形成粘稠分散液，将步骤(3)得到的基布浸泡在分散液5min，然后经刮板刮除基布表面多余分散液，干燥，锁边，取得到一种耐久性电解槽专用保温盖布。空心玻璃微球的粒径选用过500目筛，空心玻璃微球具有良好的隔热作用；聚四氟乙烯乳液为60wt％的高浓度聚四氟乙烯水相分散液(市售型号为FR301B)；通过控制刮刀力度使基布的两个表面均形成厚度0.2mm的涂层。
实施例3
(1)将牌号为PPT300的聚丙烯(由上海石化提供)100kg、十溴二苯醚1kg、三氧化二锑1kg、粒径为1250目的硅灰石粉8kg、润滑剂聚乙烯蜡1kg加入高速混合机，设置高速混合机温度为100℃，在400rpm搅拌转速下分散35min，然后经螺杆长径比为44∶1的同向双螺杆挤出机熔融挤出，通过螺杆挤出机的T型模头挤出为平膜；同向双螺杆挤出机设置五段加热，分别为第一段200℃；第二段205℃；第三段215℃；第四段220℃；第五段200℃；T型模头挤出温度为200℃；将平膜冷却后用刀片切割为坯丝；坯丝进110℃的热风道拉伸8倍，得到1000旦、宽度为0.5mm的扁丝；
(2)将步骤(1)得到的1股扁丝与1股玻璃纤维细纱并捻，捻度为1500捻/米，经140℃热定型，得到有间隙的复合线；选用的玻璃纤维细纱为连续玻璃纤维并捻纱，线密度为66dtex，由2股并捻，捻度为100捻/米；
(3)将步骤(2)得到的复合线作为经线和纬线按照经纬编制，得到基布；
(4)将水玻璃、空心玻璃微球、聚四氟乙烯乳液以质量比1∶3∶15分散搅拌均匀形成粘稠分散液，将步骤(3)得到的基布浸泡在分散液10min，然后经刮板刮除基布表面多余分散液，干燥，锁边，取得到一种耐久性电解槽专用保 温盖布。空心玻璃微球的粒径选用过500目筛，空心玻璃微球具有良好的隔热作用；聚四氟乙烯乳液为60wt％的高浓度聚四氟乙烯水相分散液(市售型号为FR301B)；通过控制刮刀力度使基布的两个表面均形成厚度0.1mm的涂层。
对比例1
(1)将牌号为PPT300的聚丙烯(由上海石化提供)100kg、十溴二苯醚1kg、三氧化二锑1kg、粒径为1250目的滑石粉5kg、润滑剂聚丙烯蜡2kg加入高速混合机，设置高速混合机温度为100℃，在400rpm搅拌转速下分散35min，然后经螺杆长径比为44∶1的同向双螺杆挤出机熔融挤出，通过螺杆挤出机的T型模头挤出为平膜；同向双螺杆挤出机设置五段加热，分别为第一段190℃；第二段205℃；第三段210℃；第四段215℃；第五段200℃；T型模头挤出温度为200℃；将平膜冷却后用刀片切割为坯丝；坯丝进110℃的热风道拉伸6倍，得到1200旦、宽度为0.8mm的扁丝；
(2)将步骤(1)得到的1股扁丝与1股玻璃纤维细纱并捻，捻度为350捻/米，经140℃热定型，得到有间隙的复合线；选用的玻璃纤维细纱为连续玻璃纤维并捻纱，线密度为66dtex，由2股并捻，捻度为120捻/米；
(3)将步骤(2)得到的复合线作为经线和纬线按照经纬编制，得到基布；
(4)将水玻璃、空心玻璃微球、聚四氟乙烯乳液以质量比1∶1∶10分散搅拌均匀形成粘稠分散液，将步骤(3)得到的基布浸泡在分散液5min，然后经刮板刮除基布表面多余分散液，干燥，锁边，卷取，得到一种耐久性电解槽专用保温盖布。空心玻璃微球的粒径过500目筛，空心玻璃微球具有良好的隔热作用；聚四氟乙烯乳液为60wt％的高浓度聚四氟乙烯水相分散液(市售型号为FR301B)；通过控制刮刀力度使基布的两个表面分别形成厚度0.2mm的涂层。
对比例2
(1)将牌号为PPT300的聚丙烯(由上海石化提供)100kg、十溴二苯醚1kg、三氧化二锑1kg、粒径为1250目的滑石粉5kg、润滑剂聚丙烯蜡2kg加入高速混合机，设置高速混合机温度为100℃，在400rpm搅拌转速下分散35min，然 后经螺杆长径比为44∶1的同向双螺杆挤出机熔融挤出，通过螺杆挤出机的T型模头挤出为平膜；同向双螺杆挤出机设置五段加热，分别为第一段190℃；第二段205℃；第三段210℃；第四段215℃；第五段200℃；T型模头挤出温度为200℃；将平膜冷却后用刀片切割为坯丝；坯丝进110℃的热风道拉伸6倍，得到1200旦、宽度为0.8mm的扁丝；
(2)将步骤(1)得到的两股扁丝并捻，捻度为150捻/米，经140℃热定型，得到有间隙的复合线；
(3)将步骤(2)得到的复合线作为经线和纬线按照经纬编制，得到基布；
(4)将水玻璃、空心玻璃微球、聚四氟乙烯乳液以质量比1∶1∶10分散搅拌均匀形成粘稠分散液，将步骤(3)得到的基布浸泡在分散液5min，然后经刮板刮除基布表面多余分散液，干燥，锁边，卷取，得到一种耐久性电解槽专用保温盖布。空心玻璃微球的粒径过500目筛，空心玻璃微球具有良好的隔热作用；聚四氟乙烯乳液为60wt％的高浓度聚四氟乙烯水相分散液(市售型号为FR301B)；通过控制刮刀力度使基布的两个表面分别形成厚度0.2mm的涂层。
对比例3
(1)将牌号为PPT300的聚丙烯(由上海石化提供)100kg、十溴二苯醚1kg、三氧化二锑1kg、粒径为1250目的滑石粉5kg、润滑剂聚丙烯蜡2kg加入高速混合机，设置高速混合机温度为100℃，在400rpm搅拌转速下分散35min，然后经螺杆长径比为44∶1的同向双螺杆挤出机熔融挤出，通过螺杆挤出机的T型模头挤出为平膜；同向双螺杆挤出机设置五段加热，分别为第一段190℃；第二段205℃；第三段210℃；第四段215℃；第五段200℃；T型模头挤出温度为200℃；将平膜冷却后用刀片切割为坯丝；坯丝进110℃的热风道拉伸6倍，得到1200旦、宽度为0.8mm的扁丝；
(2)将步骤(1)得到的1股扁丝与1股玻璃纤维细纱并捻，捻度为150捻/米，经140℃热定型，得到有间隙的复合线；选用的玻璃纤维细纱为连续玻璃纤维并捻纱，线密度为66dtex，由2股并捻，捻度为120捻/米；
(3)将步骤(2)得到的复合线作为经线和纬线按照经纬编制，得到基布；
(4)将空心玻璃微球、聚四氟乙烯乳液以质量比1∶1∶10分散搅拌均匀形成粘稠分散液，将步骤(3)得到的基布浸泡在分散液5min，然后经刮板刮除基布表面多余分散液，干燥，锁边，卷取，得到一种耐久性电解槽专用保温盖布。空心玻璃微球的粒径过500目筛，空心玻璃微球具有良好的隔热作用；聚四氟乙烯乳液为60wt％的高浓度聚四氟乙烯水相分散液(市售型号为FR301B)；通过控制刮刀力度使基布的两个表面分别形成厚度0.2mm的涂层。
参考GB/T 3139-2005纤维增强塑料导热系数试验方法，测试实施例1-3、对比例1-3盖布的导热系数，测试高温面的温度模拟电解铜槽车温度为70℃，测得盖布的导热系数如表1所示。
将实施1-3、对比例1-3批次制备的电解槽盖布用于电解铜的槽车盖布，客户电解槽电解铜的工作工况：铜离子浓度40-45g/L；循环硫酸浓度170g/L；溶液温度60-65℃。正常使用情况每吨阴极铜消耗平均蒸汽量如表1所示。盖布的使用情况如表1所述。
表1：
Figure PCTCN2021098404-appb-000001
Figure PCTCN2021098404-appb-000002
通过测试，本发明将聚丙烯扁丝与玻璃纤维细纱捻制，通过留存较多的捻制间隙使空心玻璃微球易于在间隙留存，克服了目前电解槽塑料盖布涂层易脱落、易老化的问题，而且电解槽盖布具备耐久、保温特性，在具体用于电解槽上面覆盖，可保温减少槽减少蒸汽消耗。
对比例1采用1股扁丝与1股玻璃纤维细纱并捻，捻度为350捻/米，由于捻度较高，形成的复合线间隙较少，在驻留空心微球方面性能较差，得到的电解槽盖布长时间使用、折叠容易造成空心微球的脱落。
对比例2没有使扁丝与玻璃纤维细纱并捻，因此得到的复合线尽管有间隙驻留空心玻璃微球，但由于缺少玻璃纤维细纱，硅酸钠无机粘接剂与扁丝的粘合性较差，难以有效地将空心玻璃微球粘附在扁丝，因此空心玻璃微球容易脱落。
对比例3在粘稠分散液中没有加入水玻璃，仅仅依靠聚四氟乙烯乳液的粘接性将空心玻璃微球粘附在基布并形成防护层，聚四氟乙烯涂层尽管具有良好的耐酸性能，但与基布结合性较差，在不断掀布、折叠等作用下，涂层容易与基布剥离脱落。
以上依据本发明的理想实施例为启示，通过上述的说明内容，相关人员完全可以在不偏离本项发明技术思想的范围内，进行多样的变更以及修改。本项发明的技术性范围并不局限于说明书上的内容，必须要根据权利要求范围来确定技术性范围。

Claims (10)

  1. 一种耐久性电解槽专用保温盖布的制备方法，其特征在于，具体制备方法如下：
    (1)将聚丙烯、阻燃剂、无机填料、润滑剂加入高速混合机分散均匀，然后经螺杆挤出机熔融挤出，通过螺杆挤出机的T型模头挤出为平膜；将平膜用刀片切割为坯丝；坯丝进110℃的热风道拉伸6-8倍，得到1000-1200旦的扁丝；
    (2)将步骤(1)得到的扁丝与玻璃纤维细纱并捻，经140-145℃热定型，得到有间隙的复合线；
    (3)将步骤(2)得到的复合线作为经线和纬线按照经纬编制，得到基布；
    (4)将水玻璃、空心玻璃微球加入聚四氟乙烯乳液搅拌均匀形成粘稠分散液，将步骤(3)得到的基布浸泡在分散液5-10min，然后经刮板刮除基布表面多余分散液，干燥，锁边，卷取，得到一种耐久性电解槽专用保温盖布。
  2. 根据权利要求1所述一种耐久性电解槽专用保温盖布的制备方法，其特征在于：步骤(1)中所述聚丙烯、阻燃剂、无机填料、润滑剂以重量份进行配制，聚丙烯80-100份、阻燃剂1-2份、无机填料3-8份、润滑剂1-3份。
  3. 根据权利要求1所述一种耐久性电解槽专用保温盖布的制备方法，其特征在于：步骤(1)中所述聚丙烯选用牌号有PPT300、PPF401；所述阻燃剂选用十溴二苯醚、四溴双酚A、八溴醚、八溴双S醚、TBC中的一种；所述无机填料选用滑石粉、硅灰石粉、硫酸钡粉、蒙脱石粉中的至少一种，要求粒径为1250目；所述润滑剂为聚丙烯蜡、聚乙烯蜡、硬脂酸、石蜡中的至少一种。
  4. 根据权利要求1所述一种耐久性电解槽专用保温盖布的制备方法，其特征在于：步骤(1)中所述螺杆挤出机为同向双螺杆挤出机，螺杆长径比为40-48∶1。
  5. 根据权利要求1所述一种耐久性电解槽专用保温盖布的制备方法，其特征在于：步骤(1)中所述扁丝的宽度为0.5-0.8mm。
  6. 根据权利要求1所述一种耐久性电解槽专用保温盖布的制备方法，其特征在于：步骤(2)中所述玻璃纤维细纱为连续玻璃纤维并捻纱，线密度为66dtex， 2股并捻，捻度为100-120捻/米。
  7. 根据权利要求1所述一种耐久性电解槽专用保温盖布的制备方法，其特征在于：步骤(2)中所述并捻为1股扁丝与1股玻璃纤维细纱并捻捻度为150-200捻/米。
  8. 根据权利要求1所述一种耐久性电解槽专用保温盖布的制备方法，其特征在于：步骤(4)中所述水玻璃、空心玻璃微球、聚四氟乙烯乳液以质量比1∶1-3∶10-15分散；所述空心玻璃微球的粒径选用过500目筛；所述聚四氟乙烯乳液为60wt％的高浓度聚四氟乙烯水相分散液。
  9. 根据权利要求1所述一种耐久性电解槽专用保温盖布的制备方法，其特征在于：步骤(4)中所述刮板使基布两面的涂层厚度为0.1-0.2mm。
  10. 一种由权利要求1-9任一项所述方法制备得到的耐久性电解槽专用保温盖布。
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