238results about "Dispersing agents addition" patented technology

A composite can include cellulose fiber; and foam binding the cellulose fiber. A method for manufacturing a composite can comprise mixing a plurality of ingredients to form a pre-foam mixture; foaming the pre-foam mixture to produce a foam; mixing the foam with cellulose fiber to form a composite material; and curing the composite material.

A composite can include cellulose fiber and foam binding the cellulose fiber. A method for manufacturing a composite can comprise mixing a plurality of ingredients to form a pre-foam mixture, foaming the pre-foam mixture to produce a foam, mixing the foam with cellulose fiber to form a composite material, and curing the composite material.

The invention particularly relates to a preparation method of aramid fiber filter paper, which comprises the following steps: step (1), aramid pulp fibers are added into a dispersion liquid for multiple times for dispersion treatment to obtain gradient-size aramid mixed fibers, and the dispersion liquid comprises a dispersing agent, strong base and a solvent; (2) mixing the gradient-size aramid fiber mixed fiber with water, and mechanically stirring at a high speed to obtain gradient-size aramid fiber mixed fiber slurry; and (3) processing and forming the gradient-size aramid fiber mixed fiber slurry to obtain the aramid fiber filter paper. The invention further relates to aramid fiber filter paper and application thereof. The aramid fiber filter paper disclosed by the invention is high in filter precision and low in filter resistance, and can be used as a hierarchical composite material.

The invention relates to the technical crossing field of polyphenylene sulfide fiber paper, special papermaking and insulation paper, in particular to high-temperature-resistant polyphenylene sulfide fiber composite insulation paper and a preparation process thereof. The high-temperature-resistant polyphenylene sulfide fiber composite insulation paper with a dense structure similar to reinforcing steel bar-mortar is prepared by preferably selecting the polyphenylene sulfide fiber with higher cost performance as a raw material and taking the aramid fibrid as a filling agent and an adhesive and adopting a wet papermaking process. The prepared composite paper has excellent temperature resistance and chemical corrosion resistance, the production process flow is short, the production process is free of pollution, the industrial production cost of the composite paper can be reduced, the temperature resistance and chemical stability of medium-and-low-end application insulation paper are improved, the application field of the composite paper in a more severe environment is widened, and the composite paper has good application prospects. Good economic benefits and application values are realized.

The invention discloses a preparation method of carbon fiber base paper for a proton exchange membrane electrolytic cell, which comprises the following steps: taking carboxyl modified polyacrylonitrile fiber pulp, adding a dispersant, defibering, grinding to form carboxyl modified polyacrylonitrile pulp, taking one or two dispersants, adding a carbon nanotube, and stirring to obtain a carbon nanotube dispersion liquid; then taking two dispersants and carbon fibers, adding the two dispersants and the carbon fibers into water, stirring to form a carbon fiber dispersion liquid, adding the carboxyl modified polyacrylonitrile pulp into the carbon nanotube dispersion liquid, defibering to form a prefabricated liquid, mixing and stirring the carbon fiber dispersion liquid and the prefabricated liquid to prepare a compound system dispersion liquid, preparing a wet paper web by wet forming, curtain-coating a binder on the wet paper web, and drying to obtain the carbon fiber composite paper. Preparing carbon fiber raw paper; the carbon fiber base paper is prepared by mixing the treated carboxyl modified polyacrylonitrile pulp with the carbon nanotubes and then uniformly mixing the mixture with the carbon fibers, so that the bending strength and the conductivity of the base paper can be effectively improved, and the process difficulty is reduced.

The invention provides a bending-resistant water-based transfer coating and application thereof in a transfer card. The bending-resistant water-based transfer coating comprises the following components in parts by mass: 10-15 parts of modified polyurethane resin; 5-10 parts of modified water-based styrene-acrylic resin; 10 to 15 parts of ethanol; 55 to 60 parts of deionized water; 0.1 to 0.2 part of a dispersing aid; 0.07 to 0.12 part of a leveling agent; and 0.1 to 0.13 part of a defoaming agent. The water-based transfer coating disclosed by the invention has a high-brightness holographic effect and excellent strippability, can improve the folding resistance of a transfer card, and has wide market value and application prospect.

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 present invention provides formulations comprising a suspension of nanocellulose (NC) elements and a drying / dispersal additive selected from the group consisting of temperature-responsive polymers, small molecule additives in volatile systems, and blocking agents and methods of preparing such formulations, and further provides NC-containing materials, composite materials and useful articles of manufacture made therefrom.

The invention discloses carbon paper for a fuel cell gas diffusion layer and a preparation method thereof, and belongs to the technical field of fuel cells. The method comprises the following steps: oxidizing a carbon nanotube under strong acid to obtain a carboxylated carbon nanotube; mixing the ferroferric oxide with a soluble ferric salt solution, and adding a sodium hydroxide solution to prepare a ferroferric oxide / carbon nanotube compound; mixing the Pickring emulsion with an adhesive, a resin diluent and distilled water to obtain a Pickring emulsion adhesive; the method comprises the following steps: dispersing carbon fibers in an aqueous solution containing a dispersant and a surfactant, pulping to prepare carbon fiber slurry, and papermaking to obtain carbon fiber raw paper; the preparation method comprises the following steps: soaking carbon fiber raw paper in a Pickring emulsion adhesive, and carrying out in-situ demulsification to obtain carbon fiber bonded raw paper; and sequentially carrying out three procedures of water removal of the carbon fiber bonding body paper, magnetic field control of orientation of the magnetic conductive particles and hot press molding to obtain the carbon paper. The method disclosed by the invention is simple, low in consumption, cost-saving, environment-friendly and capable of avoiding the problem that the carbon paper cracks due to multiple times of resin impregnation.

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 invention relates to the technical field of fuel cells, in particular to a carbon fiber base material for a fuel cell, a preparation method of the carbon fiber base material, raw carbon paper and a preparation method of the raw carbon paper. The preparation method of the carbon fiber base material comprises the following steps: S1, adopting MFC or a mixture of MFC and pre-oxidized fiber pulp as reinforcing fibers, mixing the reinforcing fibers with water, and pulping to obtain premixed slurry; s2, uniformly mixing carbon fibers, the premixed slurry and a dispersing agent to obtain mixed slurry, molding the mixed slurry by adopting a wet molding process, and drying to obtain the carbon fiber base material. The MFC or the mixture of the MFC and the pre-oxidized fiber pulp is used as the reinforcing fiber, and the reinforcing fiber is pulped and then mixed with the carbon fiber and the dispersing agent to prepare the carbon fiber base material, so that the dispersity of the carbon fiber and the mechanical strength and conductivity of the carbon fiber base material in the wet forming process can be improved; and the negative influence on the subsequent preparation of the raw carbon paper is avoided.

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 present invention provides formulations comprising a suspension of nanocellulose (NC) elements and a drying / dispersal additive selected from the group consisting of temperature-responsive polymers, small molecule additives in volatile systems, and blocking agents and methods of preparing such formulations, and further provides NC-containing materials, composite materials and useful articles of manufacture made therefrom.

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 a preparation method and application of composite nano-silver paper with a low thermal expansion coefficient, and the preparation method comprises the following steps: S1, diluting a dispersion solution obtained after surface modification of a nanoscale ceramic material to obtain a diluent; s2, uniformly mixing a diluent and the silver nanowire mother liquor to obtain a mixed liquor, wherein the solid content ratio of the nanoscale ceramic material in the diluent to the silver nanowire in the silver nanowire mother liquor is (0.3-5): 100; and S3, carrying out solid-liquid separation, drying and pre-pressing on the mixed solution to obtain the composite nano-silver paper. By adding the nanoscale ceramic material, the thermal expansion coefficient of the silver layer after hot pressing sintering can be effectively reduced, and therefore the cold and hot impact performance is improved.

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 discloses a heat-conducting aramid insulation paper-based material as well as a preparation method and application thereof. The preparation method of the heat-conducting aramid insulation paper-based material comprises the following steps: (1) introducing amino groups on the surfaces of boron nitride nanosheets to obtain aminated boron nitride nanosheets; (2) dissolving m-phenylenediamine in N, N-dimethylacetamide, then adding m-phthaloyl dichloride, then adding the amino boron nitride nanosheets, and carrying out a reaction to obtain a heat-conducting aramid polymer solution; (3) performing wet spinning on the heat-conducting aramid polymer solution to obtain heat-conducting aramid fibers; and (4) mixing the heat-conducting aramid fiber and the fibrid, and manufacturing the heat-conducting aramid insulation paper-based material. The amino boron nitride nanosheets are connected with amide groups among aramid macromolecules, so that the interfacial compatibility of the filler and the base material in the paper material is improved, and the strength and the heat-conducting property of the paper material are improved.

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 the field of paper plastics, and in particular to a paper plastic slurry, a paper plastic product and a paper plastic manufacturing process. The paper plastic slurry comprises fiber slurry and a plurality of additives. The paper plastic slurry is used to prepare the paper plastic product through pulping, slurry mixing, molding, shaping and the like. The paper plastic manufacturing process provided by the invention is simple, and the final paper plastic product has excellent strength and hardness, and excellent waterproof and moisture-proof performance. Each additive is added separately, and other additives are added after mixing for a certain period of time. Due to the different viscosities and surface charges of various additives and the different functions played by them, each additive is added according to the adding sequence of the invention, so that each additive can play a better effect. Through the coordination of a plurality of additives, the characteristics and functions of each additive are fully utilized, and the superposition of effects is achieved, so that the paper plastic product obtained by the paper plastic manufacturing process has excellent strength, hardness, waterproof and moisture-proof performance.

The present invention provides formulations comprising a suspension of nanocellulose (NC) elements and a drying / dispersal additive selected from the group consisting of temperature-responsive polymers, small molecule additives in volatile systems, and blocking agents and methods of preparing such formulations, and further provides NC-containing materials, composite materials and useful articles of manufacture made therefrom.

The invention provides carbon paper for a fuel cell and a preparation method of the carbon paper, and relates to the technical field of fuel cells, long carbon fibers of 6 mm and short carbon fibers of 3 mm are selected, mixed and added into a PVA-PVP composite water-soluble polymer solution, dried after being soaked and coated, and continuously mixed with elastic fibers and reinforced fibers to prepare slurry, and the slurry is formed, coiled and cut to prepare the carbon paper. During the period, the carbon fibers are subjected to surface treatment, and the technical means of polymer coating and multi-fiber mixing are utilized, so that the finally prepared carbon paper has higher strength, air permeability and uniformity.

The invention discloses a manufacturing method of solvent-free silicone oil type antibacterial release paper, and belongs to the technical field of papermaking, and the method comprises the following steps: S1, cutting needlebush and broadleaf wood into wood chips, cooking, dipping the cooked wood chips in a sulfite solution, taking out, and extruding to remove excessive moisture, so as to obtain a semi-finished product of the solvent-free silicone oil type antibacterial release paper; grinding the wood chips through a disc to obtain sulfite paper pulp; s2, adding filler powder, a wet strength agent, fiber dispersion and water into the sulfite paper pulp to obtain papermaking primary pulp, pulping the papermaking primary pulp, and performing papermaking operation to obtain coarse base paper; s3, coating two surfaces of the coarse base paper with isolation slurry and antibacterial slurry respectively, drying, and carrying out calendering treatment to obtain glassine paper; s4, coating the surface of the antibacterial coating of the glassine paper with a solvent-free silicone oil release agent, and drying to obtain antibacterial release paper; the antibacterial release paper has a good antibacterial effect, and the antibacterial coating and the release layer are firmly attached to each other.

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 invention provides a rosin supplement / cationic rosin sizing agent, which is composed of rosin, a rosin supplement, a cationic polymer emulsifier and a dispersant, the use amount of the rosin supplement is 5-20wt% of the total use amount of the rosin and the rosin supplement, and the rosin supplement is formed by graft copolymerization of polyethylene wax, maleic anhydride and styrene. According to the rosin supplement / cationic rosin sizing agent, maleic anhydride and styrene are added into polyethylene wax to serve as grafting monomers, grafting modification is initiated by organic peroxide to obtain grafted modified polyethylene wax, then the grafted modified polyethylene wax and rosin are mixed and melted according to a certain proportion, a cationic polymer emulsifier and a dispersing agent are added, and water-in-oil emulsion is obtained; and finally adding hot water for phase inversion. The modified polyethylene wax is used as a rosin supplement to partially replace rosin to prepare the cationic rosin sizing agent, so that the stability and the sizing effect of the product can be greatly improved, the dosage of the rosin can be greatly reduced, and the production cost is reduced.

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 the technical field of tipping paper, and particularly provides water-based tipping paper. The problems that traditional water-based tipping paper is uneven in appearance and unstable in suction resistance due to moisture absorption expansion are solved. Comprising an activated carbon layer, a moisture absorption layer and a water-based outer layer, the moisture absorption layer and the water-based outer layer are sequentially arranged on the surface of the activated carbon layer, the water-based outer layer is prepared from, by weight, 45-55 parts of waterborne polyurethane, 15-25 parts of hydrophobic nano SiO2, 25-30 parts of deionized water, 1-2 parts of wetting dispersant and 0.1-1 part of defoaming agent, and the average particle size of the hydrophobic nano SiO2 is 20-50 nm. The hydrophobic nano SiO2 is nano SiO2 modified by octadecylsilane, and the solid content of the waterborne polyurethane is 30%. The expansion rate of the tipping paper in a high-humidity environment is remarkably reduced, the air permeability is stable, the appearance is flat, and the smoking experience is consistent. And compared with a traditional product, the environment-friendly property and the practicability are both achieved, and the good application prospect is achieved.

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.