141results about "Dispersing agents addition" patented technology

The invention discloses a mineral-based easily-recyclable compostable water-based barrier coating and a preparation method thereof, and belongs to the technical field of paper-based packaging materials. The coating takes water as a carrier, and is composed of a biodegradable film forming system and a designed graded lamellar mineral system composed of three minerals with different sizes and morphologies. The mineral system comprises flaky kaolin with specific morphology and size, non-asbestos grade flaky talc and fully stripped sodium montmorillonite. A mineral sheet layer forms a compact parallel spreading barrier path in a coating through a specific coating and drying curing process, and excellent water vapor and oxygen barrier, water resistance and oil resistance are realized under the low dry weight of 8-15g / m by combining with a pH value response type reversible cross-linking system. The coating system does not contain polyvinylidene chloride and perfluoroalkyl and polyfluoroalkyl substances. The paper-based material coated with the coating is easy to defibrillate and recover under the standard alkaline warm water condition, the fiber recovery rate is high, and meanwhile, the whole material meets the industrial composting requirement.

The invention relates to the technical field of functional paper production, in particular to a pressing and flat pasting composite process of skin-touch surface polymer coated paper, which comprises the following steps: pretreating a base material through low-temperature plasma to form a nano groove; the preparation method comprises the following steps: preparing a bottom coating solution containing sulfydryl modified polyurethane and other components, a middle coating layer containing a carbon nanotube forest and a surface coating solution containing a fluorosilicone block copolymer, and sequentially coating, drying and curing; the coated paper and the base material treated by the silicon dioxide transition layer are compounded after being subjected to vacuum hot pressing and steam treatment, and then are subjected to ultraviolet ozone treatment, so that the comprehensive performance is improved. According to the process, by innovating a coating formula and a compounding technology, the wear resistance, pollution resistance and touch performance of the coated paper are remarkably improved, and the functions of antibiosis, temperature sensing adjustment and the like are achieved; the gloss is adjustable, the adhesive force is high, the VOCs emission is low, the environmental protection property is good, and the multi-element requirements of the high-end market are met.

The application discloses a mineral-based easily-recyclable compostable water-barrier coating and a preparation method thereof, and belongs to the technical field of paper-based packaging materials. The coating is formed by a biodegradable film-forming system and a hierarchical lamellar mineral system containing three different scales and morphologies. The mineral system contains specific morphology and size of lamellar kaolin, non-asbestos grade lamellar talc and fully exfoliated sodium montmorillonite. The mineral lamella forms a dense parallel spread barrier path in the coating through a specific coating and drying solidification process, and combines a pH value responsive reversible cross-linking system to achieve excellent water vapor and oxygen barrier properties, water resistance and oil resistance at a low dry weight of 8-15 g / m2. The coating system does not contain polyvinylidene chloride and perfluoro and polyfluoro alkyl substances. The paper-based material coated with the coating is easily defibered and recycled under standard alkaline warm water conditions, and the fiber recovery rate is high, and meanwhile, the whole material meets the industrial composting requirements.

The invention provides high-humidity base paper and a quantifiable preparation process thereof, and relates to the field of paper production and processing. Comprising the following raw materials in percentage by mass: 15%-25% of softwood pulp, 40%-55% of hardwood pulp, 10%-25% of soft fibers, 10%-20% of nanocellulose, 0.5%-1.5% of vegetable fat polymer composite microspheres and 1%-3% of functional aids, wherein the solid content of aqueous suspension of the softwood pulp and the hardwood pulp is 3%-8%; the nano cellulose is subjected to surface modification treatment. According to the paper, coniferous wood pulp long fibers, hardwood pulp short fibers and soft fibers are utilized to form a three-dimensional framework, nano-crystalline cellulose enhances wet load transmission through a nanoscale bridging network, vegetable fat microspheres construct a hydrophobic layer to inhibit moisture permeation, the three components have a synergistic effect, so that the wet tensile strength is improved, and meanwhile, high air permeability is kept; and the balance of water resistance and ventilation is realized.

The invention discloses a paper-based diaphragm for alkaline water electrolysis and a preparation method of the paper-based diaphragm. A PPS / aramid fiber porous base material is prepared by adopting a wet non-woven process, a PVA-polymer quaternary ammonium salt blending layer is constructed on one side of the base material, OH <-> conduction is promoted by utilizing a quaternary ammonium group of polymer quaternary ammonium salt, and a three-dimensional network is formed through glutaraldehyde crosslinking. According to the paper-based diaphragm prepared through the method, when the porosity is 60.4%, the strength still reaches 8.98 MPa, the surface resistance of the diaphragm is greatly reduced to 68 m omega.cm < 2 >, the ionic conductivity synchronously jumps to 515 mS.cm <-1 >, the electrolytic current density is promoted to reach 1474 mA under the polarization voltage of 2.0 V, the vertical swelling rate of the diaphragm is stabilized at 12% through the cross-linked functional layer, and the paper-based diaphragm has the advantages that the paper-based diaphragm can be applied to the field of lithium ion batteries. The diaphragm achieves an optimal balance in key indexes such as aperture, strength, ionic conductivity and alkali liquor stability.

The invention discloses carbon fiber paper, a preparation method thereof and a proton exchange membrane fuel cell, and relates to the technical field of fuel cells. The preparation method comprises the following steps: filtering carbon fiber slurry containing chopped polyacrylonitrile-based carbon fibers, and carrying out wet molding to obtain a wet carbon fiber layer; adding a modified reinforcing agent solution into the wet carbon fiber layer, and then heating, drying and pressing to obtain carbon fiber base paper; and immersing the carbon fiber base paper into the resin solution, drying, and carrying out hot-pressing curing, carbonization and graphitization treatment to prepare the carbon fiber paper for the fuel cell. According to the invention, the modified reinforcing agent and the functional filler can be more easily adhered to the cross connection part of the carbon fibers, so that on one hand, an electrified network is enhanced, the electric conduction and heat conduction properties of the product are improved, and on the other hand, pore filling caused by addition of the conventional functional filler in a resin impregnation stage can be avoided; and negative effects are generated on pores and air permeability of the product.

The invention provides a moisture-proof corrugated board and a production process thereof. The moisture-proof corrugated board comprises inner paper, core paper and surface paper which are sequentially arranged, and the surfaces of the inner paper and the core paper are coated with moisture-proof coatings; the invention relates to a preparation method of an anti-aging agent. The moisture-proof coating is prepared from the following raw materials: 35 to 45 parts of waterborne acrylic resin, 10 to 16 parts of fluorine modified shape memory polyurethane, 8 to 12 parts of waterborne polyurethane dispersion, 4 to 8 parts of bamboo charcoal loaded nano silver-zinc oxide composite particles, 3 to 6 parts of hydrophobic nano silicon dioxide, 5 to 9 parts of chitosan modified nano cellulose, 1.5 to 2.5 parts of silane coupling agent, 0.8 to 1.2 parts of dispersing agent, 0.2 to 0.4 part of defoaming agent and 0.5 to 0.9 part of wetting leveling agent. The corrugated board provided by the invention has excellent moisture resistance, mildew resistance and structural stability.

The invention relates to the technical field of insulation paper, and discloses high-performance anti-deformation high-temperature-resistant composite insulation paper which is prepared from the following components: inorganic fibers, core-shell structure modified organic silicon resin emulsion, nano intercalation surface treatment mica powder, aramid fibers and an auxiliary additive, according to the high-performance anti-deformation high-temperature-resistant composite insulation paper provided by the invention, the comprehensive performance of the composite paper is remarkably improved through reasonable proportioning of all the components and special treatment of specific components. According to the composite insulation paper prepared by the invention, the inorganic fiber is used as a main framework material of the composite paper, and the basalt fiber or the ceramic fiber has high strength, high modulus and good high temperature resistance, so that a basic mechanical support is provided for the composite paper. The aramid fibers and the inorganic fibers have a synergistic effect, so that the mechanical strength and the flexibility of the composite paper are further enhanced. And the dispersing agent polyoxyethylene can effectively improve the dispersity of each component in the slurry, so that the fibers and the filler are uniformly distributed.

The invention relates to a modified aramid nanofiber aqueous dispersion, cellophane and a preparation method of the modified aramid nanofiber aqueous dispersion. The preparation method comprises the following steps: dispersing para-aramid fiber in a DMSO / KOH system to obtain DMSO dispersion liquid of aramid fiber; adding acid anhydride for esterification modification, putting the modified dispersion liquid into a dialysis bag, dialyzing in deionized water, taking out, and carrying out mechanical treatment, so as to obtain the modified aramid nanofiber aqueous dispersion liquid. Carboxylate ions are introduced to the surface of the aramid fiber by adopting an esterification modification method for the first time, so that the aramid fiber is stably dispersed in water for a long time under the action of electrostatic repulsion, the preparation method is simple, the cost is low, and the diameter of the aramid nanofiber can be controlled by regulating and controlling the charge ratio of anhydride. The modified aramid nanofiber cellophane prepared from the aqueous dispersion through vacuum filtration and hot pressing has high strength and high transparency, the tensile strength can reach 257 MPa, the maximum visible light transmittance can reach 83%, and the modified aramid nanofiber cellophane has good application prospects in the field of high-performance transparent materials.

The invention relates to absorbent paper as well as a preparation method and application thereof. The method comprises the following steps: pulping plant fiber pulp, adding sodium bicarbonate for pretreatment, and washing to obtain pretreated paper pulp; adding a dispersing agent, a wet strength agent and a composite antibacterial component into the pretreated paper pulp, and uniformly mixing to obtain mixed paper pulp; the composite antibacterial component is prepared from chitosan, polylysine and a modified copper oxide dispersion liquid; feeding the mixed paper pulp into a rotary screen paper machine to produce upper-layer single-layer wrinkling base paper, then compounding the upper-layer single-layer wrinkling base paper with lower-layer single-layer semi-forming base paper on which the macromolecular water-absorbent resin particles are scattered, and then drying to obtain the water-absorbent paper. The antibacterial rate of the absorbent paper on various pathogenic bacteria is larger than or equal to 99.5%, the antibacterial rate is still larger than or equal to 97% after 20 times of water washing, and the absorbent paper is high in water absorption speed, stable in physical performance, safe, environmentally friendly, controllable in cost, capable of being widely applied to the fields of hygienic products, medical dressings, food packaging and the like, simple in preparation process and suitable for industrial production.

The present invention discloses a production process for carbon paper base for a gas diffusion layer, comprising the following steps: S1: preparing a suspended slurry; S2: papermaking, pressing, heating to T1, and drying to obtain a first base paper; S3: applying an aqueous resin dispersion containing conductive particles to the first base paper, heating to T2 for pre-drying, and obtaining a second base paper; S4: continuously spraying water onto the second base paper in a mist-like manner, non-contact heating the second base paper to T3, dissolving the first water-soluble fiber in the second base paper, and pressing and drying to obtain a third base paper; S5: hot pressing and carbonizing the third base paper to obtain a carbon paper base for a gas diffusion layer; T1 and T2 are lower than the water-soluble temperature of the first water-soluble fiber, and T3 is higher than the water-soluble temperature of the first water-soluble fiber and lower than the water-soluble temperature of the second water-soluble fiber. This production process for carbon paper base for a gas diffusion layer is advantageous in reducing the resistivity of the flocs and improving the porosity and air permeability of the carbon paper base paper. The present invention also discloses a carbon paper.

This invention relates to the field of vacuum cleaner technology, specifically to a simple dust collector, comprising a vacuum cleaner body and a suction tube. The vacuum cleaner body includes a collection shell and a main body shell connected in sequence. One end of the suction tube has a brush suction tube communicating with it, and the other end of the suction tube communicates with the collection shell. The collection shell and the main body shell are interconnected. The main body shell houses a cyclone mechanism, a battery pack, and a PCB control board. The cyclone mechanism is located inside the main body shell at the end where the main body shell connects to the collection shell. The PCB control board is located on one side of the battery pack, and both the cyclone mechanism and the PCB control board are electrically connected to the battery pack. The collection shell houses a filter mechanism. This simple dust collector is a small dust collector suitable for both home and vehicle use, meeting people's needs for vacuuming narrow crevices in vehicles, desktops, keyboards, etc. Its compact design makes it easy to carry and store; users can hold it directly on the outside of the main body without needing a separate handle.

The invention discloses a preparation method of coated gift packaging paper. The preparation method comprises the following operation steps: S1, pulping: respectively pulping bleached sulfate softwood chemical pulp, bleached sulfate broadleaf wood chemical pulp and alkaline hydrogen peroxide bleached poplar chemimechanical pulp, and mixing to form mixed pulp; s2, auxiliary material adding, wet paper sheet forming and pre-drying; s3, coating and sizing are conducted, specifically, the front face and the back face of the paper sheet are coated with a coating respectively, and the coating comprises coating-grade light calcium carbonate, coating-grade talcum powder, a dispersing agent, sodium hydroxide, modified acrylic copolymer emulsion, polyvinyl acetate latex, coating starch, sodium carboxyl cellulose, a lubricating agent and a defoaming agent; s4, carrying out post-drying and carrying out super-soft calendering treatment by adopting eight rollers and seven pressing areas; the invention also provides the coated gift packaging paper prepared by adopting the preparation method, the smoothness of the coated gift packaging paper is greater than 1200s, the roughness of the coated gift packaging paper is less than 1.2 microns, and the coated gift packaging paper completely meets the requirements of the coated gift packaging paper for absorbing and drying gravure or flexographic printing water-based ink.

The invention discloses a double-sided heterogenous non-woven fabric and a preparation method thereof, the double-sided heterogenous non-woven fabric is prepared by a wet papermaking technology, and the double-sided heterogenous non-woven fabric is sequentially provided with a hydrophobic layer, a transition layer and a hydrophilic layer; the hydrophobic layer is composed of hydrophobic fibers; the hydrophilic layer is composed of hydrophilic fibers; the transition layer is an area formed by mixing hydrophobic fibers and hydrophilic fibers, the content of the hydrophobic fibers in the transition layer is gradually reduced from the side close to the hydrophobic layer to the side close to the hydrophilic layer, and the content of the hydrophilic fibers is gradually increased from the side close to the hydrophobic layer to the side close to the hydrophilic layer; in the hydrophilic fiber and the hydrophobic fiber, the density of one fiber is higher than that of water, and the density of the other fiber is lower than that of water; the hydrophilicity is derived from modification of the fiber body instead of a surface coating, the hydrophobic layer, the transition layer and the hydrophilic layer are integrally formed, no hot melt adhesive or chemical adhesive bonding interface exists, and the interlayer stripping layering risk and the influence of chemical reagents are avoided.

The invention belongs to the technical field of filter materials, and particularly relates to a preparation method of an aramid fiber filter material with controllable filter precision, which comprises the following steps: S1, dividing an aramid fiber precursor into three parts, and respectively processing the three parts into superfine nanofiber, medium-precision fiber and crude fiber; s2, mixing the following components to prepare a dispersion liquid system: deionized water, a nonionic surfactant, a cationic surfactant, a dispersing aid, a pH regulator and an organic cosolvent; s3, adding superfine nanofibers, medium-precision fibers and crude fibers in different mass ratios into the dispersion liquid system, and stirring until the materials are fully and uniformly mixed to obtain aramid fiber dispersion liquid with different filtering precisions; s4, performing vacuum filtration on the aramid fiber dispersion liquid to form a wet film; and after drying treatment, carrying out hot press molding by adopting a hot press process to finally obtain the aramid fiber filter material with controllable filter precision. According to the method, the filtering precision of the filter material can be accurately regulated and controlled, fiber agglomeration is effectively prevented, and the dispersion uniformity of fibers in a solution is improved.

The invention relates to the technical field of composite paper antibacterial film preparation, and mainly relates to a composite paper antibacterial film preparation method, which comprises: S1, raw material preparation: preparing kraft paper, an antibacterial agent and a dispersant; s2, preparing an antibacterial layer; s3, compounding is carried out; s4, trimming is conducted, specifically, the composite film roll is conveyed to pass through trimming equipment, the composite film roll is cut into the specified size through the trimming equipment, and edge flaws are removed; in the preparation process of the composite paper antibacterial film, the adjusting part in the trimming equipment drives the two cutting parts to swing, so that the two cutting parts can conduct trimming treatment on paper in turn, meanwhile, the cleaning part is used for cleaning the lifted cutting parts, continuous trimming is avoided when glue is attached, the production efficiency is improved, and the production cost is reduced. Therefore, burrs and other flaws are generated during trimming, and the trimming quality is improved.

The invention discloses a preparation method of high-performance cellulose insulation paper modified by nano-alumina. The preparation method comprises the following steps: preparing a nano-alumina dispersion liquid, preparing a nano-cellulose dispersion liquid, adding paper pulp fibers, the nano-alumina dispersion liquid and the nano-cellulose dispersion liquid into deionized water, and carrying out papermaking, the mass fraction of the nano cellulose in the modified cellulose edge paper is 1-12%. According to the preparation method provided by the invention, nano aluminum oxide and nano cellulose particles are adopted as modified materials, a large number of heat conduction channels are formed in a fiber structure of the insulation paper, the heat conduction performance of the insulation paper is improved, and the insulation paper can still keep stable performance and is not prone to thermal aging and deformation in a high-temperature environment; a large number of traps can be formed in the paper, migration of charged particles is hindered, conductive current is reduced, and the volume resistivity of the insulation paper is improved; the method is simple in steps and low in cost, and industrial production and practical application of the insulation paper are facilitated.

The invention discloses preparation and application of in-situ growth NH2-MIL-53 / polyethyleneimine synergistically modified composite functional paper, and belongs to the technical field of composite materials. The method comprises the following steps: by taking wood pulp fibers as a base material, pretreating the wood pulp fibers with sodium hydroxide, introducing amino groups through polyethyleneimine modification, growing NH2-MIL-53 in situ, and carrying out suction filtration forming and drying to obtain the composite functional paper. The molar ratio of the aluminum source to the 2-aminoterephthalic acid is 1-2, the drying temperature is 60 DEG C, and the drying time is 12 hours. The composite paper has excellent performance in CO2 adsorption and CO2 / N2 selective adsorption, the CO2 adsorption capacities under 273.15 K and 298.15 K respectively reach 1.69 mmol.g <-1 > and 1.56 mmol.g <-1 >, the CO2 / N2 selectivity is 20.64, the performance is stable after 10 times of circulation, and the composite paper is suitable for the field of efficient carbon capture.

The application provides a modified bamboo pulp, a preparation method and application of the modified bamboo pulp in a bamboo pulp roll for a paper pulp molding direct-press process. The mass ratio of short fibers and long fibers in the bamboo pulp is 45-75:55-25 by utilizing the more compact cross-linking characteristics between the short bamboo fibers, and the bamboo pulp is modified by adding a pulp modifier with a mass fraction of 0.1%-0.5% of the bamboo pulp, wherein the pulp modifier is a mixture of a vinyl alkyl polymer, an imidazoline quaternary ammonium salt, an ester quaternary ammonium salt and sodium hydroxide, so that the tightness of the modified bamboo pulp is 0.65-0.70 g / cm 3 , the stiffness is 25-55 mN.m, the swelling of the fibers in the modified bamboo pulp is uniform, and the binding force is better, and the compactness between the fibers is further improved by the fine components in the bamboo pulp and the addition of auxiliary reagents; the three-dimensional structure of the fibers in the bamboo pulp roll produced by using the modified bamboo pulp is more uniform and the compactness is higher, so that the uniformity of the thickness is ensured, and the dimensional stability and mechanical performance indexes of the bamboo pulp roll for the paper pulp molding direct-press process are met.

The present invention provides composite fiber paper and a method for preparing the same. The method comprises: feeding polypropylene fibers into a fiber deflaker and adding water to deflake them to obtain polypropylene fiber slurry; feeding para-aramid fibers into the fiber deflaker containing the polypropylene fiber slurry and continuing to add water to deflake them to obtain composite fiber slurry; feeding a dispersant, a surfactant, an inorganic filler, and the composite fiber slurry into a pulping tank, adding water to mix them, and preparing a pulp; and sequentially wet-sheeting the pulp, dehydrating it by pressing, drying it, and hot-pressing it to obtain composite fiber paper. The para-aramid fibers used in the present invention are plasma-pretreated para-aramid fibers. The present invention can produce durable composite fiber paper with excellent antibacterial properties.

The invention discloses a pulp mixing method for improving fiber interlacing force, which comprises the following steps: increasing fiber brooming rate (greater than or equal to 35%) through stepped pulping, optimizing parameters of a mixer and a headbox to enhance pulp uniformity, moving a cationic polyacrylamide retention aid forwards to an inlet of the mixer, prolonging reaction time to 12s, and compounding with polyvinyl alcohol and quaternary ammonium salt auxiliaries. And meanwhile, a linkage control relation (the pressure is + 0.01 MPa when the network speed is increased by 50m / min) between the network speed and the pulp outlet pressure is established, and three-level monitoring of safety, early warning and abnormity is realized in combination with more than one hundred thousand parameter databases. According to the scheme, fiber agglomeration and forming instability are effectively reduced, the paper breaking rate is remarkably reduced, and the raw paper strength and the production stability are improved.

The application relates to the technical field of paper for fuel cells, and particularly discloses carbon fiber raw paper for fuel cells and a preparation method thereof, which comprises the following components: 100 parts (70-95 parts of short-cut carbon fibers and 5-30 parts of water-soluble fibers) of fibers, 40-50 parts of dispersant A, 50-100 parts of dispersant B and 0.5-1 part of defoaming agent; after the short-cut carbon fibers and the water-soluble fibers are defibrated, the dispersant A is added for mixing and high-speed stirring to complete foam dispersion, water is added for dilution to first-concentration carbon fiber slurry; the defoaming agent is added for first-time stirring to obtain carbon fiber dispersion slurry; the remaining dispersant A and the dispersant B are added for second-time stirring, water is added for dilution to second-concentration carbon fiber slurry; the second-concentration carbon fiber slurry is used for papermaking to obtain the carbon fiber raw paper for fuel cells. The carbon fibers are prone to occur in the dispersion process, the phenomenon of silk and flocculation is solved, the paper uniformity is good, the tensile strength is high, the carbon fiber raw paper for fuel cells is used for fuel cells, and the important index requirements of porosity and resistance and the like are met.

The invention relates to the technical field of pulping and papermaking, in particular to traditional Lanpavilion cocoon paper and a preparation method thereof. The preparation method of the traditional Lanting cocoon paper comprises the following steps: pretreating and selecting raw materials; carrying out two-stage chemical cooking; washing and fiber decomposition; pulping and preparing pulp; and performing papermaking and drying to obtain the traditional Lanpavilion cocoon paper. The traditional Lanting cocoon paper (mulberry paper) prepared by adopting the technical scheme is excellent in fiber purity, ageing resistance, mechanical strength and the like, the whiteness is greater than or equal to 60%, the ageing-resistant whiteness is reduced by less than or equal to 0.5%, the tearability is greater than or equal to 1560 mN, and the dust degree is less than or equal to 50 pieces / m < 2 >; the style and appearance of traditional famous paper are restored, and a feasible process path is provided for modern production of high-quality handmade paper.

This invention relates to the interdisciplinary fields of carbon fiber and specialty papermaking, and particularly to a resin-crosslinked conductive carbon fiber base paper for hydrogen fuel cells and its preparation process. The preparation method first involves soaking aramid pulp A in deionized water; then, pitch-based carbon fiber B and aramid pulp are wet-formed to obtain carbon fiber paper; next, the pitch-based carbon fiber paper is impregnated with phenolic resin, dried, and finished to obtain pitch-based carbon fiber base paper; finally, the pitch-based carbon fiber base paper is placed in a tube furnace for heating and heat preservation to obtain carbon fiber conductive paper. This method solves the problem of simultaneously achieving high conductivity and high air permeability. It is a new method for preparing carbon fiber conductive paper using pitch-based carbon fiber as the skeleton, aramid pulp as the auxiliary forming fiber, and low-concentration phenolic resin impregnation and high-temperature carbonization for reinforcement.

The present invention includes surface-interactive utensils comprising a foamed material that includes a simple nanocellulose element (NCE)-based matrix comprising redispersed or redispersible NCEs or a composite NCE-containing matrix comprising redispersed or redispersible NCEs. The invention also includes methods of manufacturing such utensils.

The application belongs to the technical field of papermaking, and particularly relates to a domestic fiber anti-fake coated cigarette card paper and a production process thereof. The domestic fiber anti-fake coated cigarette card paper comprises a base paper layer, a coating layer and a back adhesive layer. The base paper comprises a surface layer, a core layer and a bottom layer. The anti-fake domestic fiber accounts for 4-6% of the surface layer, 1-3% of the core layer and 6-9% of the bottom layer. The coating layer is coated on the surface layer and is divided into three layers, i.e., a pre-coating layer, a middle coating layer and a surface coating layer. The back adhesive layer is coated on the bottom layer. The application adds the anti-fake domestic fiber with different proportions in three layers to form a unique texture on the paper plane. The three-dimensional fiber texture with different levels and different brightness can be observed through light. The anti-fake fiber on the surface layer of the paper surface is greater than or equal to 50 per 55*22 mm, and the anti-fake fiber on the bottom layer is greater than or equal to 140 per 55*22 mm. The prepared coated cigarette card paper can be effectively distinguished from ordinary white card paper and has the anti-fake function.

This invention relates to the fields of specialty paper, carbon fiber composite paper, and electrothermal material preparation technology, specifically to a layered structure pitch-based carbon fiber skeleton electrothermal base paper and its preparation process. The preparation method includes surface paper preparation, intermediate layer preparation, layered structure paper preparation, and layered structure paper reinforcement. This invention utilizes a clever combination of carbon fibers of different lengths, aramid pulp, aramid precipitation, and carbon black to form a "sandwich" layered structure. The introduction of carbon black in the surface layer reduces the resistance of the insulating fibers, stabilizes the heating power, prevents electrothermal loss, and improves the uniformity of heating. The long carbon fibers used in the intermediate layer can provide a current conduction path and improve the overall utilization rate of carbon fibers.

According to the preparation method of the hydrophobic deep filtering paperboard, natural fibers are subjected to hydrophobic modification, so that the deep filtering paperboard is endowed with uniform hydrophobic performance, the interaction between the surface of the paperboard and a filter cake layer can be reduced, and a filter cake is convenient to peel off. The hydrophobic natural fiber can be uniformly dispersed in water without additional treatment on the hydrophobic fiber, so that the hydrophobic fiber does not need to be subjected to pre-hydrophilic treatment in the paperboard preparation process, the process is simple, and the cost is low. The low-melting-point fibers are used as a binder, surface fibers of the deep filtering paperboard can be reinforced, when the deep filtering paperboard scrapes a filter cake, the surface fibers cannot fall off, the deep filtering paperboard has great wet strength and bending strength, and compared with a traditional deep filtering paperboard, the deep filtering paperboard has the advantages that the surface fibers are not prone to falling off; and when a filter cake is scraped, the filter cake can be prevented from being damaged due to bending and twisting in a wet state. The filter press disclosed by the invention is low in cost and convenient to use, and has a relatively high practical value.

The present invention discloses aramid composite insulating paper, a preparation method, and applications, relating to the technical field of aramid paper. The present invention provides a method for preparing aramid composite insulating paper. The aramid composite insulating paper prepared by the present invention is prepared by combining two fiber materials, combining the advantages of aramid chopped fibers and modified cellulose, and producing a synergistic and positive effect. The present invention combines cellulose with aramid fibers for composite papermaking to produce aramid composite insulating paper, significantly reducing production costs and having broad application prospects.