CN114575176A - Method for manufacturing low-cost pure meta-aramid insulating composite paper - Google Patents
Method for manufacturing low-cost pure meta-aramid insulating composite paper Download PDFInfo
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- CN114575176A CN114575176A CN202210360540.5A CN202210360540A CN114575176A CN 114575176 A CN114575176 A CN 114575176A CN 202210360540 A CN202210360540 A CN 202210360540A CN 114575176 A CN114575176 A CN 114575176A
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/34—Kneading or mixing; Pulpers
- D21B1/345—Pulpers
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/20—Methods of refining
- D21D1/30—Disc mills
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/02—Drying on cylinders
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F7/00—Other details of machines for making continuous webs of paper
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/10—Organic non-cellulose fibres
- D21H13/20—Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H13/26—Polyamides; Polyimides
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Abstract
The invention discloses a method for manufacturing low-cost pure meta-aramid insulating composite paper, which belongs to the technical field of aramid paper preparation and comprises the following steps: preparing raw materials, namely 5-40 parts by weight of aramid chopped fibers and 60-95 parts by weight of aramid fibrids; manufacturing two layers of inclined nets by papermaking; carrying out reticulate pattern roller coating water by using deionized water; hot rolling is carried out in a mode of flat rolling and back rolling in sequence. In the invention, the fibrid is filamentous fibrid, the specific surface area of the fibrid is smaller than that of lamellar fibrid, the water filtration is fast during papermaking, the papermaking speed is fast, and the papermaking speed can be greatly improved; the invention adopts ultra-low concentration slurry, which requires large dewatering amount of the forming net part, and adopts double-lap nets, and the dewatering amount can be ensured to be enough by using a 2-layer inclined net paper machine to manufacture the composite paper under the sizing concentration of 0.01-0.02 percent, thereby ensuring the quality of the composite paper; the wet rolling method is adopted for hot rolling, the blank paper is humidified by deionized water, and then the wet blank paper is hot rolled, so that the paper surface is high in strength and smooth.
Description
Technical Field
The invention relates to the technical field of aramid fiber paper preparation, in particular to a method for manufacturing low-cost pure meta-aramid fiber insulating composite paper.
Background
The meta-aramid paper is a paper-like high-temperature-resistant material which is prepared by taking meta-aramid chopped fibers and meta-aramid fibrids as raw materials and adopting wet papermaking and hot rolling forming, wherein the chopped fibers provide mechanical strength, the fibrids provide bonding, and dielectric properties are provided in insulation application.
The meta-aramid paper has the advantages of light weight, high strength, high temperature resistance, flame retardance, corrosion resistance and excellent dielectric property, and can be used as an insulating material and a honeycomb core material to be widely applied to the fields of aerospace, rail transit, electrical and electronic insulation and the like. The meta-aramid paper applied in the insulation field is divided into two categories: composite paper (A) and pure paper. The composite paper is generally used after being compounded with a polyester film (M), a polyimide film (H or K) or polyphenylene sulfide (P) to form an AM two-layer structure or an AMA three-layer structure composite material. The soft composite material is applied to slot insulation, turn-to-turn insulation, liner insulation, transformer coil wrapping insulation and the like of a motor, and currently, the complete soft composite material standard specification is JB/4061.1-1995. A typical product model number in the field is T464, from dupont, usa.
In the application of the soft composite material, the aramid composite paper mainly plays roles of high temperature resistance, tearing resistance, wear resistance, stiffness increase and the like, the requirement on the insulation effect of the aramid composite paper is relatively low, the T464/0.05mm dielectric strength 10Kv/mm-12Kv/mm basically meets the use requirement, and compared with the pure paper T410/0.05mm dielectric strength 17.3Kv/mm, the difference is large. Meanwhile, the application of the soft composite material is wide, the demand is high, and the product is positioned to have medium performance and low cost in order to stand in the intense market competition, so that the cost reduction and the efficiency improvement become the key point of research and development on the basis of keeping a certain performance.
In the process of manufacturing aramid fiber paper, chopped fibers and fibrids are generally mixed in an aqueous medium according to a certain proportion, then are deposited on a net, and are made into base paper; and then, carrying out high-temperature hot rolling on the base paper by utilizing the glass transition principle of the aramid fiber material to form finished paper. Therefore, the papermaking speed and the hot rolling speed are the key points for reducing the cost of the composite paper.
Disclosure of Invention
The invention aims to provide a method for manufacturing low-cost pure meta-aramid insulating composite paper, which aims to solve the technical problem that the cost of aramid composite paper in the prior art is high.
The invention provides a method for manufacturing low-cost pure meta-aramid insulating composite paper, which comprises the following steps:
sp 1: preparing raw materials, namely 5-40 parts by weight of aramid chopped fibers and 60-95 parts by weight of aramid fibrids;
sp 1-1: the aramid chopped fiber is meta-aramid fiber with the length of 6-10mm and the fineness of 1-3 denier;
sp 1-2: the preparation method of the aramid fibrid comprises the following steps:
sp 1-2-1: preparing a low-temperature meta-aramid polymer;
sp 1-2-2: preparing a solidification solution;
sp 1-2-3: feeding the meta-aramid polymer into a precipitation machine through a nozzle to be mixed with the solidification liquid, carrying out high-speed shearing stirring, and uniformly mixing to obtain a precipitation fiber product;
sp 1-2-4: solidifying the product, and then washing the pulp to obtain the aramid fibrid;
sp 2: manufacturing two layers of inclined nets;
sp 2-1: dispersing and defibering the aramid chopped fiber raw material in water to prepare aramid chopped fiber slurry with the mass concentration of 0.3-0.8%;
sp 2-2: dispersing and defibering the aramid fibrid raw material in water, and performing disc grinding until the beating degree is 50-650SR to prepare aramid fibrid slurry with the mass concentration of 1-2%;
sp 2-3: after aramid chopped fiber pulp and aramid fibrid pulp are uniformly mixed in a proportioning tank, the concentration of the aramid chopped fiber pulp and the aramid fibrid pulp is 0.01-0.02%, the pulp is transversely distributed and uniformly flows through a central pulp distributor by adjusting a pulp feeding head, pulp with consistent speed and dispersed fibers is fed onto a wire of an inclined net pulp flowing box, the pulp is uniformly distributed on two layers of forming nets, redundant pulp overflows to a white water tank, when the pulp runs along the forming nets, water is filtered from the pulp under the action of dehydration pressure difference to form wet paper sheets, and the wet paper sheets pass through a drying cylinder of a paper machine to obtain raw paper;
sp 3: reticulate pattern roller coating water;
sp 3-1: preparing deionized water;
sp 3-2: selecting an adaptive anilox roller, wherein one surface of the anilox roller is fully contacted with deionized water, so that the surface of the roller can adsorb the deionized water;
sp 3-3: pasting the rough paper on the other side of the anilox roller, and coating water during moving;
sp 4: hot rolling;
sp 4-1: carrying out hot rolling on the water-coated raw paper in a flat rolling mode:
sp 4-2: and carrying out back rolling on the flat-rolled rough paper.
Further, in the preparation of the aramid fibrid, the nozzles are arranged in a square shape, the number of the holes of the nozzles is two, and when the filamentous aramid fibrid is prepared, the surfaces of the nozzles are provided with thin round holes; and when preparing the sheet film aramid fibrid, forming slit holes on the surface of the nozzle. In the invention, round resin nozzles are changed into square by improving the hole pattern of the nozzles, and are refined on square nozzles again, fine round holes are used for making the filamentous fibrids, the number of the fine round holes is large, the papermaking speed is ensured, if the fine round holes are changed into slit holes, the flaky fibrids can be fixedly produced, and even if turbulence exists in the settling machine, the membranous characteristics of most fibrids can still be ensured.
Further, in the preparation of the aramid fibrid, the concentration of the low-temperature meta-aramid polymer is 4-8%, the relative viscosity is 0.8-1.3, and the temperature is controlled at 0-20 ℃.
Further, in the preparation of the aramid fibrid, a prepared solidification solution is a mixture of an amide solvent and water, wherein the amide solvent is dimethylacetamide, the content of the amide solvent in the solidification solution is 20-35%, the temperature of the solidification solution is 0-20 ℃, and the mass ratio of the low-temperature meta-aramid polymer to the solidification solution is 1: 10-30.
Further, in the preparation of the aramid fibrid, the high-speed stirring speed is 4000-7000 rpm.
Further, in the preparation of the aramid fibrid, the curing treatment is to perform disc mill treatment on the product. The fibrids treated by the disc mill can further stretch and solidify the product.
Furthermore, the speed of the anilox roller coating water is 80-100m/min, and the humidity range is 10-30%.
Further, in the hot rolling, under the flat rolling process step, the pressure of a hot rolling line is 1-5MPa, the surface temperature of a roller is 180-.
Further, in the hot rolling, under the back roll rolling step, the pressure between the rolls is 0-4MPa, the temperature of the roll surface is 170-220 ℃, and the rolling speed is 20-30 m/min. The hot rolling process adopts a double-temperature double-pressure process of flat rolling and back rolling, in the flat rolling process, fibrids are heated, melted and softened at high temperature, water in a pressure zone promotes the soft fibrids to be effectively spread and coated on the surface of chopped fibers, the distance between fiber molecules is shortened by thermal stress, and an amorphous zone is regularly arranged along a certain orientation and enters a crystallization zone, so that the crystallinity of the aramid paper is improved; the purpose of back rolling is to perform further regular repair on the aramid paper after flat rolling at a slightly lower temperature, so that the internal structure of the aramid paper is tighter, and the paper surface is smoother and smoother.
Compared with the prior art, the invention has the beneficial effects that:
firstly, under the condition of ensuring the basic performance of the aramid fiber composite paper to reach the standard in the prior art, because the market positioning is medium performance and low cost, cost reduction and efficiency increase become the key points of research and development, and papermaking speed and hot rolling speed are effective methods for reducing the cost of the composite paper, aiming at the problems, the invention designs a method for manufacturing low-cost pure meta-position aramid fiber insulating composite paper, which sequentially comprises the steps of preparing raw materials, papermaking by two layers of inclined nets, rolling anilox water and hot rolling to obtain a finished aramid fiber composite paper, when the raw materials are prepared, the fineness of chopped fibers is generally 2D, 1.5D and 1D, the length is generally 6mm, the specific surface area is small, the influence on the papermaking speed is small, and fibrid is selected from filiform fibrid, although the structure of the aramid fiber produced by the filiform fibrid is loose, the dielectric strength is also relatively low, and is generally 9-12Kv/mm, but the dielectric strength of the grade can basically meet the application requirement of the aramid fiber paper for compounding, the specific surface area of the aramid fiber paper is smaller than that of lamellar fibrid, the water filtration is fast during papermaking, the papermaking speed is fast, and the papermaking speed can be greatly improved; in order to ensure the uniformity of paper sheets, the ultra-low concentration pulp is adopted, so that the dewatering amount of a forming net part is required to be large, the traditional process is generally realized by adding a vacuum dewatering box or increasing the total length of a forming interval, a plurality of round nets, a plurality of inclined nets and a plurality of long nets are generally selected for papermaking, but after the number of the nets is increased, the difficulty is brought to operation control, and the cost is also increased, the dual-layer net is selected, and the inclined net has low-concentration large-flow dewatering forming capacity under the sizing concentration of 0.01-0.02 percent, the papermaking speed of the inclined net is greatly improved, and good process condition guarantee is created for the good uniformity and the transverse width quantification of the paper sheets by using a 2-layer inclined net paper machine; on the other hand, in the traditional hot rolling process, a dry rolling method is mostly adopted, because the thermal conductivity coefficient of the aramid fiber paper is low, the temperature of a hot rolling roller is set to be high, generally 275-295 ℃, although fibrid is melted well in a high-temperature range, the edge of a wide paper surface shrinks greatly, edge wrinkling is generated, meanwhile, whiteness is reduced, the appearance of a product is influenced, if the wrinkled paper edge is cut and removed, loss is increased, cost is increased, and in a relatively low-temperature range, although the whiteness of the product is increased, fibrid is not melted sufficiently, and the paper surface is easy to fluff, the invention adopts a wet rolling method for hot rolling, humidifies blank paper by deionized water, then hot rolls the wet blank paper, uses water as a plasticizer, can reduce the glass transition temperature Tg of the aramid fiber paper, when hot rolling, fibrid is melted sufficiently, and the paper surface strength is high, and is relatively smooth.
Secondly, in the prior art, each manufacturer at home and abroad has a separate fibrid production method, but from the technical path, because the settling machines adopt large-caliber circular nozzles, the produced settling fibers are the mixture of filiform fibers and film-shaped settling under the shearing action and have uneven thickness, and the film-shaped settling fibers influence the papermaking speed.
Thirdly, in the invention, the hot rolling process adopts a double-temperature double-pressure process of flat rolling and back rolling, in the flat rolling process, the fibrids are heated, melted and softened at high temperature, water in the pressure zone promotes the soft fibrids to be effectively spread and coated on the surfaces of the chopped fibers, the distance between fiber molecules is shortened by thermal stress, and the amorphous zone is regularly arranged along a certain orientation and enters the crystallization zone, so that the crystallinity of the aramid paper is improved; the purpose of back rolling is to perform further regular repair on the aramid paper after flat rolling at a slightly lower temperature, so that the internal structure of the aramid paper is tighter, and the paper surface is smoother and smoother.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic flow diagram of the present invention;
FIG. 2 is a schematic view of a filamentous fibrid nozzle according to the present invention;
FIG. 3 is a schematic view of a hot rolling process in the present invention.
Reference numerals:
1. a thin circular hole; 2. a slit hole; 3. and (4) a shearing knife.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention.
The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.
All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1 to 3, an embodiment of the present invention provides a method for manufacturing a low-cost pure meta-aramid insulation composite paper, including the following steps:
sp 1: preparing raw materials, namely 5-40 parts by weight of aramid chopped fibers and 60-95 parts by weight of aramid fibrids;
sp 1-1: the aramid chopped fiber is meta-aramid fiber with the length of 6-10mm and the fineness of 1-3 denier;
sp 1-2: the preparation method of the aramid fibrid comprises the following steps:
sp 1-2-1: preparing a low-temperature meta-aramid polymer;
sp 1-2-2: preparing a solidification solution;
sp 1-2-3: feeding the meta-aramid polymer into a precipitation machine through a nozzle to be mixed with a solidification liquid, carrying out high-speed shearing stirring, and uniformly mixing to obtain a precipitation fiber product;
sp 1-2-4: solidifying the product, and then washing the pulp to obtain aramid fibrid;
sp 2: manufacturing two layers of inclined nets;
sp 2-1: dispersing and defibering the aramid chopped fiber raw material in water to prepare aramid chopped fiber slurry with the mass concentration of 0.3-0.8%;
sp 2-2: dispersing and defibering the aramid fibrid raw material in water, and performing disc grinding until the beating degree is 50-650SR to prepare aramid fibrid slurry with the mass concentration of 1-2%;
sp 2-3: after aramid chopped fiber pulp and aramid fibrid pulp are uniformly mixed in a proportioning tank, the concentration of the aramid chopped fiber pulp and the aramid fibrid pulp is 0.01-0.02%, the pulp is transversely distributed and uniformly flows through a central pulp distributor by adjusting a pulp feeding head, pulp with consistent speed and dispersed fibers is fed onto a wire of an inclined net pulp flowing box, the pulp is uniformly distributed on two layers of forming nets, redundant pulp overflows to a white water tank, when the pulp runs along the forming nets, water is filtered from the pulp under the action of dehydration pressure difference to form wet paper sheets, and the wet paper sheets pass through a drying cylinder of a paper machine to obtain raw paper;
sp 3: reticulate pattern roller coating water;
sp 3-1: preparing deionized water;
sp 3-2: selecting an adaptive anilox roller, wherein one surface of the anilox roller is fully contacted with deionized water, so that the surface of the roller can adsorb the deionized water;
sp 3-3: pasting the rough paper on the other side of the anilox roller, and coating water during moving;
sp 4: hot rolling;
sp 4-1: carrying out hot rolling on the water-coated raw paper in a flat rolling mode:
sp 4-2: and carrying out back rolling on the flat-rolled rough paper.
In the prior art, under the condition of ensuring that the basic performance of aramid fiber composite paper reaches the standard, the market positioning is medium performance and low cost, so cost reduction and efficiency increase become the key points of research and development, and the papermaking speed and the hot rolling speed are effective methods for reducing the cost of the composite paper, aiming at the problems, the invention designs a manufacturing method of low-cost pure meta-aramid fiber insulating composite paper, which sequentially comprises the steps of preparing raw materials, papermaking by two layers of inclined nets, roller coating water by reticulate lines and hot rolling to obtain the finished aramid fiber composite paper, wherein when the raw materials are prepared, chopped fibers are generally 2D, 1.5D and 1D, the length is generally 6mm, the specific surface area is small, the influence on the papermaking speed is small, and fibrid is selected from filiform fibrid, although the structure of the aramid fiber paper produced by the filiform fibrid is loose, the dielectric strength is also relatively low, and is generally 9-12Kv/mm, but the dielectric strength of the grade can basically meet the application requirement of the aramid fiber paper for compounding, the specific surface area of the aramid fiber paper is smaller than that of lamellar fibrid, the water filtration is fast during papermaking, the papermaking speed is fast, and the papermaking speed can be greatly improved; in order to ensure the evenness of the paper sheet, the ultra-low concentration slurry is adopted, so that the dewatering amount of a forming net part is required to be large, in the traditional process, the method is generally realized by additionally arranging a vacuum dewatering box or increasing the total length of a forming interval, a plurality of circular nets, a plurality of inclined nets and a plurality of long nets are generally selected for papermaking, but the difficulty is brought to operation control after the number of the nets is increased, and the cost is also increased, the method selects double-layer nets, and can ensure that the dewatering amount is enough and the quality of the composite paper when the 2-layer inclined net paper machine is used for papermaking the composite paper under the sizing concentration of 0.01-0.02 percent, so that the inclined net has the low-concentration large-flow dewatering forming capacity through the design of the two-layer forming net, the inclined net papermaking speed is greatly improved, and good process condition guarantee is created for the good evenness and the transverse width ration of the paper sheet; on the other hand, in the traditional hot rolling process, a dry rolling method is mostly adopted, because the thermal conductivity coefficient of the aramid fiber paper is low, the temperature of a hot rolling roller is set to be high, generally 275-295 ℃, although fibrid is melted well in a high-temperature range, the edge of a wide paper surface shrinks greatly, edge wrinkling is generated, meanwhile, whiteness is reduced, the appearance of a product is influenced, if the wrinkled paper edge is cut and removed, loss is increased, cost is increased, and in a relatively low-temperature range, although the whiteness of the product is increased, fibrid is not melted sufficiently, and the paper surface is easy to fluff, the invention adopts a wet rolling method for hot rolling, humidifies blank paper by deionized water, then hot rolls the wet blank paper, uses water as a plasticizer, can reduce the glass transition temperature Tg of the aramid fiber paper, when hot rolling, fibrid is melted sufficiently, and the paper surface strength is high, and is relatively smooth.
Specifically, in the preparation of the aramid fibrid, the nozzles are arranged in a square shape, the hole patterns of the nozzles are arranged in two types, and when the filamentous aramid fibrid is prepared, the surfaces of the nozzles are provided with thin round holes 1; when preparing the sheet film aramid fibrid, a slit hole 2 is arranged on the surface of the nozzle. In the prior art, manufacturers at home and abroad have respective fibrid production methods, but from the technical path, because the fibrids produced by the fibrids are all mixtures of filiform fibers and lamellar fibrids which are precipitated under the shearing action and have uneven thickness, and the lamellar fibrids influence the papermaking speed, the circular resin nozzle is changed into the square shape by improving the hole pattern of the nozzle, and the circular resin nozzle is refined on the square nozzle again, so that the fine circular holes 1 are used for producing the filiform fibrids, the papermaking speed is ensured, if the fine circular holes 1 are changed into the slit holes 2, the lamellar fibrids can be fixedly produced, and the membranous characteristics of most fibrids can be still ensured even if turbulence exists in the fibrids.
Specifically, in the preparation of the aramid fibrid, the concentration of the low-temperature meta-aramid polymer is 4-8%, the relative viscosity is 0.8-1.3, and the temperature is controlled at 0-20 ℃.
Specifically, in the preparation of the aramid fibrid, the prepared solidification solution is a mixture of an amide solvent and water, wherein the amide solvent is dimethylacetamide, the content of the amide solvent in the solidification solution is 20-35%, the temperature of the solidification solution is 0-20 ℃, and the mass ratio of the low-temperature meta-aramid polymer to the solidification solution is 1: 10-30.
Specifically, in the preparation of the aramid fibrid, the high-speed stirring speed is 4000-7000 rpm.
Specifically, in the preparation of the aramid fibrid, the curing treatment is to perform disc mill treatment on the product. The fibrids treated by the disc mill can further stretch and solidify the product.
Specifically, the speed of the anilox roller coating water is 80-100m/min, and the humidity range is 10-30%.
Specifically, in the hot rolling, under the flat rolling process step, the pressure of a hot rolling line is 1-5MPa, the surface temperature of a roller is 180-230 ℃, and the rolling speed is 15-20 m/min.
Specifically, in the hot rolling, under the back roll rolling step, the pressure between rolls is 0-4MPa, the roll surface temperature is 170-220 ℃, and the rolling speed is 20-30 m/min. The hot rolling process adopts a double-temperature double-pressure process of flat rolling and back rolling, in the flat rolling process, fibrids are heated, melted and softened at high temperature, water in a pressure zone promotes the soft fibrids to be effectively spread and coated on the surface of chopped fibers, the distance between fiber molecules is shortened by thermal stress, and an amorphous zone is regularly arranged along a certain orientation and enters a crystallization zone, so that the crystallinity of the aramid paper is improved; the purpose of back rolling is to perform further regular repair on the aramid paper after flat rolling at a slightly lower temperature, so that the internal structure of the aramid paper is tighter, and the paper surface is smoother and smoother.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A manufacturing method of low-cost pure meta-aramid insulating composite paper is characterized by comprising the following steps: the method comprises the following steps:
sp 1: preparing raw materials, namely 5-40 parts by weight of aramid chopped fibers and 60-95 parts by weight of aramid fibrids;
sp 1-1: the aramid chopped fiber is meta-aramid fiber with the length of 6-10mm and the fineness of 1-3 denier;
sp 1-2: the preparation method of the aramid fibrid comprises the following steps:
sp 1-2-1: preparing a low-temperature meta-aramid polymer;
sp 1-2-2: preparing a solidification solution;
sp 1-2-3: feeding the meta-aramid polymer into a precipitation machine through a nozzle to be mixed with the solidification liquid, carrying out high-speed shearing stirring, and uniformly mixing to obtain a precipitation fiber product;
sp 1-2-4: solidifying the product, and then washing the pulp to obtain the aramid fibrid;
sp 2: manufacturing two layers of inclined nets;
sp 2-1: dispersing and defibering the aramid chopped fiber raw material in water to prepare aramid chopped fiber slurry with the mass concentration of 0.3-0.8%;
sp 2-2: dispersing and defibering the aramid fibrid raw material in water, and performing disc grinding until the beating degree is 50-650SR to prepare aramid fibrid slurry with the mass concentration of 1-2%;
sp 2-3: after aramid chopped fiber pulp and aramid fibrid pulp are uniformly mixed in a proportioning tank, the concentration of the aramid chopped fiber pulp and the aramid fibrid pulp is 0.01-0.02%, the pulp is transversely distributed and uniformly flows through a central pulp distributor by adjusting a pulp feeding head, pulp with consistent speed and dispersed fibers is fed onto a wire of an inclined net pulp flowing box, the pulp is uniformly distributed on two layers of forming nets, redundant pulp overflows to a white water tank, when the pulp runs along the forming nets, water is filtered from the pulp under the action of dehydration pressure difference to form wet paper sheets, and the wet paper sheets pass through a drying cylinder of a paper machine to obtain raw paper;
sp 3: reticulate pattern roller coating water;
sp 3-1: preparing deionized water;
sp 3-2: selecting an adaptive anilox roller, wherein one surface of the anilox roller is fully contacted with deionized water, so that the surface of the roller can adsorb the deionized water;
sp 3-3: pasting the rough paper on the other side of the anilox roller, and coating water during movement;
sp 4: hot rolling;
sp 4-1: carrying out hot rolling on the water-coated raw paper in a flat rolling mode:
sp 4-2: and carrying out back rolling on the flat-rolled rough paper.
2. The manufacturing method of the low-cost pure meta-aramid insulation composite paper as claimed in claim 1, characterized in that: in the preparation of the aramid fibrid, the nozzles are square, the hole patterns of the nozzles are two, and when the filamentous aramid fibrid is prepared, the surfaces of the nozzles are provided with thin round holes (1); when preparing the sheet membrane aramid fibrid, slit holes (2) are arranged on the surface of the nozzle.
3. The manufacturing method of the low-cost pure meta-aramid insulation composite paper as claimed in claim 1, characterized in that: in the preparation of the aramid fibrid, the concentration of the low-temperature meta-aramid polymer is 4-8%, the relative viscosity is 0.8-1.3, and the temperature is controlled at 0-20 ℃.
4. The manufacturing method of the low-cost pure meta-aramid insulation composite paper as claimed in claim 1, characterized in that: in the preparation of the aramid fibrid, the prepared solidification solution is a mixture of an amide solvent and water, wherein the amide solvent is dimethylacetamide, the content of the amide solvent in the solidification solution is 20-35%, the temperature of the solidification solution is 0-20 ℃, and the mass ratio of the low-temperature meta-aramid polymer to the solidification solution is 1: 10-30.
5. The manufacturing method of the low-cost pure meta-aramid insulation composite paper as claimed in claim 1, characterized in that: in the preparation of the aramid fibrid, the high-speed stirring speed is 4000-7000 rpm.
6. The manufacturing method of the low-cost pure meta-aramid insulation composite paper as claimed in claim 1, characterized in that: in the preparation of the aramid fibrid, the curing treatment is to carry out disc mill treatment on the product.
7. The manufacturing method of the low-cost pure meta-aramid insulation composite paper as claimed in claim 1, characterized in that: the speed of the reticulate pattern roller coating water is 80-100m/min, and the humidity range is 10-30%.
8. The manufacturing method of the low-cost pure meta-aramid insulation composite paper as claimed in claim 1, characterized in that: in the hot rolling, under the flat rolling process step, the pressure of a hot rolling line is 1-5MPa, the surface temperature of a roller is 180-230 ℃, and the rolling speed is 15-20 m/min.
9. The manufacturing method of the low-cost pure meta-aramid insulation composite paper as claimed in claim 1, characterized in that: in the hot rolling, under the back roll rolling step, the pressure between the rolls is 0-4MPa, the temperature of the roll surface is 170-220 ℃, and the rolling speed is 20-30 m/min.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115075045A (en) * | 2022-06-16 | 2022-09-20 | 赣州龙邦材料科技有限公司 | Preparation method of uniform and flat aramid fiber honeycomb paper |
| CN115125765A (en) * | 2022-06-14 | 2022-09-30 | 株洲时代华先材料科技有限公司 | Preparation method of low-air permeability and low-quantitative meta-aramid honeycomb paper |
| CN115198567A (en) * | 2022-06-28 | 2022-10-18 | 陈克复 | High-performance aramid laminated board and preparation method and application thereof |
| CN115897292A (en) * | 2022-10-28 | 2023-04-04 | 株洲时代华先材料科技有限公司 | Aramid crepe paper and preparation method thereof |
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- 2022-04-07 CN CN202210360540.5A patent/CN114575176A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115125765A (en) * | 2022-06-14 | 2022-09-30 | 株洲时代华先材料科技有限公司 | Preparation method of low-air permeability and low-quantitative meta-aramid honeycomb paper |
| CN115075045A (en) * | 2022-06-16 | 2022-09-20 | 赣州龙邦材料科技有限公司 | Preparation method of uniform and flat aramid fiber honeycomb paper |
| CN115198567A (en) * | 2022-06-28 | 2022-10-18 | 陈克复 | High-performance aramid laminated board and preparation method and application thereof |
| CN115198567B (en) * | 2022-06-28 | 2023-10-13 | 陈克复 | High-performance aramid laminate and preparation method and application thereof |
| CN115897292A (en) * | 2022-10-28 | 2023-04-04 | 株洲时代华先材料科技有限公司 | Aramid crepe paper and preparation method thereof |
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