40 results about "Pulp bleaching" patented technology

The invention relates to the technical field of bamboo pulp bleaching, and particularly discloses a method for preparing all-chlorine-free bleached bamboo pulp and application. The method adopts a three-section enhanced bleaching process and comprises the following steps: firstly, decomposing lignin under an alkaline condition of 100-115 DEG C through oxygen delignification (Op section); removing transition metal ions by using sulfuric acid and a metal chelating agent with a specific structure by adopting acid pickling chelation (AQ section); and finally, deeply oxidizing the residual lignin in a high-pressure oxygen environment through oxygen enhanced bleaching (Po section). In each stage, hydrogen peroxide is used as a main bleaching agent, sodium hydroxide, sodium silicate and other assistants are matched, and ineffective decomposition of hydrogen peroxide is effectively inhibited through staged pH regulation and a metal chelation technology. The whiteness of the obtained bamboo pulp is larger than or equal to 83% ISO, the kappa number is smaller than or equal to 3.0, and the requirements of high-grade paper products are completely met.

The invention provides a preparation method of environment-friendly straw paper with hydrophobic and lip-sticking-free properties. The preparation method comprises the following steps: respectively pulping bleached softwood pulp and bleached hardwood pulp, and mixing to obtain a fiber mixture; adding a biological wax waterproof system sizing agent into the fiber mixture, or adding the biological wax waterproof system sizing agent and an antibacterial agent, and adding a wet strength agent and an alkyl ketene dimer, and carrying out net forming treatment; the preparation method comprises the following steps: carrying out squeezing dehydration and primary drying treatment on paper pulp subjected to net forming treatment, carrying out surface coating and sizing by adopting a sizing system containing a biological wax waterproof system sizing agent, carrying out secondary drying treatment, and finally sequentially carrying out calendering and coiling to obtain the environment-friendly straw paper. Experiments show that the straw paper disclosed by the invention has the advantages of excellent hydrophobicity, no lip sticking, high strength, high antibacterial property, complete degradability, no toxicity and environment friendliness.

The utility model discloses a paper pulp bleaching device which comprises a bleaching tank, a top cover is detachably mounted at the top of the bleaching tank, a transmission shaft is rotatably mounted at the center of the top cover, a first bevel gear is sleeved outside the transmission shaft, a speed reducing motor is mounted on the top cover through a support, and the output end of the speed reducing motor is in transmission connection with the transmission shaft. The bleaching agent is uniformly fed into the bleaching tank through the dosing mechanism, the mixing of paper pulp and the bleaching agent is accelerated by matching with the stirring of the stirrer, and the position of the semicircular cavity can be adjusted up and down under the matching of the connecting piece, so that the free switching of the conveying height of the bleaching agent is completed, and the problem that the conveying height of the bleaching agent cannot be changed in the transmission dosing process is avoided. The problem that the bleaching agent cannot be in full contact with paper pulp is solved, the two dosing mechanisms can be adjusted to be arranged at the same height or different heights according to needs, the bleaching agent can be smoothly put into the bleaching tank at different liquid levels, the bleaching precision is improved, and operation of technicians is facilitated.

The invention provides bamboo reed bleached fluff pulp as well as a preparation method and application thereof, and belongs to the field of papermaking. According to the characteristics of low bonding strength and small bursting strength of the arundo donax short fibers and parenchyma cells, the use of chemicals such as a debonding agent and the like is canceled, the preparation process is different from a traditional bamboo fluff pulp preparation process, the components of the arundo donax short fibers are reserved, the three-dimensional structure of the arundo donax bleached fluff pulp fibers is optimized, the water absorption and water retention capacity of the fluff pulp is improved, and meanwhile, the paper pulp yield is optimized. According to the raw material characteristics of the bamboo reed, the process conditions of prehydrolysis, cooking and bleaching are optimized, and an economical and efficient bleached fluff pulp product of the bamboo reed pulp is produced, so that the method has good practical application value.

The present invention relates to the field of biotechnology, and specifically relates to β-1,4-endoxylanase XlyAE10, its encoding gene and applications thereof. The xylanase XlyAE10 provided by the present invention is a β-1,4-endoxylanase XlyAE10 with excellent properties, good pH stability and heat resistance. The optimal temperature of this enzyme is 60.0 °C, and the optimal pH value is 5.5. It still maintains 50% of its activity within the range of pH 4.0 - 9.0, and has 93.26% of its enzyme activity at 65.0 °C. It can be applied to high-temperature biotechnology fields such as food, feed, textile, pulp bleaching and energy development, and has broad application prospects.

The application discloses a pulp bleaching method based on electric field gradient coupling oxygen nucleus. The method comprises the following steps: adding pulp into a reaction kettle, adding alkali and a protective agent, stirring and mixing, and heating; when the temperature is heated to 90-100 DEG C, the temperature is kept, a direct current electric field is applied to the reaction kettle and oxygen is introduced under high-speed stirring, and reaction is carried out for 3-5 min; reaction is carried out for 30-120 min under low-speed stirring. The method solves the problems of low reaction efficiency and low oxygen utilization rate in the existing oxygen delignification process. By applying a direct current electric field to the outer wall of the reaction kettle, the oxygen molecules are separated by the electric field force, and the combination ability with the surface of the pulp fiber is improved. The method significantly improves the removal efficiency of lignin, and significantly improves the pulp brightness and Kappa number. The application is suitable for the field of pulping and papermaking, and has important significance for the bleaching process with high environmental protection requirements.

The invention provides a composite metal catalyst and application thereof in biological combined light treatment paper pulp bleaching. The method comprises the following steps: dividing and brooming cooked paper pulp fibers by adopting biological pretreatment, and then carrying out illumination bleaching under simulated sunlight irradiation by adopting a metal photocatalyst (ZnO, ZFO, ZAO, ZMO and the like). According to the mild treatment method, the whiteness of the paper pulp is improved, and meanwhile it is guaranteed that fibers are not damaged. Compared with traditional chemical bleaching, biological combined light treatment bleaching has the advantages that the content of pollutants in wastewater is greatly reduced, meanwhile, reacted metal oxides can be recycled, and the combined treatment method can be used as a novel paper pulp fiber bleaching mode.

The present invention discloses a preparation method and application of an asymmetric wettability composite cathode with a three-dimensional porous high-oxygen-transport carbon-based substrate loaded with a highly active and inexpensive catalyst. An asymmetric wettability composite electrode is made by coating a cheap commercial catalyst (such as carbon black, activated carbon, acetylene black, and graphite powder) onto the carbon-based substrate through a binder, and can be applied to an electrochemical reactor to electrocatalytically produce alkaline hydrogen peroxide through oxygen reduction, belonging to the field of application of electrocatalytic materials. The purpose of the present invention is to solve the problems of the cumbersome and complex preparation process, high cost, and low mass transfer efficiency of the cathodes for most electrocatalytic hydrogen peroxide production at present. The beneficial effects of the present invention are: the process is simple, the prepared electrode has a high hydrogen peroxide yield and low power consumption, the cost is low, and using this as the cathode of an electrochemical reaction, the hydrogen peroxide concentration for pulp bleaching can be continuously produced in the reactor, having good development prospects.

The application belongs to the technical field of bioengineering, and particularly relates to a high-temperature-resistant laccase mutant obtained by site-directed mutation through an overlapping PCR technique, and preparation and application thereof. The laccase mutant is obtained on the basis of a wild-type laccase shown in SEQ ID NO. 1, and at least one of D221Y, E231D, Y441H or Y441F mutations occurs, and the mutant enzyme activity and the thermal stability at 80 DEG C are both improved to different degrees relative to the wild type, which is beneficial to expand the application in the industrial fields of degrading lignocellulose, paper pulp bleaching and the like.

The invention discloses a bleaching method of low-concentration paper pulp, which comprises the following steps: 1) adjusting the pH value of the low-concentration paper pulp to 2.0-4.0, adding a viscosity protective agent, transferring into a low-pressure ozone adding device, and introducing normal-pressure ozone to obtain ozone-containing low-concentration paper pulp; and 2) transferring the ozone-containing low-concentration paper pulp into a turbulent flow type high-shear mixer for fully mixing the paper pulp and ozone, then transferring into an up-flow ozone reaction tower for bleaching reaction, and then transferring into a steam-water separator for steam-water separation to obtain bleached paper pulp and residual ozone. The bleaching method of the low-concentration paper pulp has the advantages of simplicity and convenience in operation, simple equipment, good bleaching effect, high ozone utilization efficiency, small influence on the viscosity of the paper pulp and the like, is suitable for bleaching paper pulp formed by cooking wood and grass raw materials and paper pulp subjected to oxygen delignification treatment, and is suitable for large-scale industrial application.

The utility model relates to the technical field of paper pulp bleaching, and discloses a hydrogen peroxide supply device for a wood pulp bleaching process, which comprises an oxygen generator, a water purifier, a liquid caustic soda pressure stabilizing and filtering system, a hydrogen peroxide electrolysis production system, an energy storage system and the like. And an alkaline hydrogen peroxide storage tank is arranged on the outer side of the hydrogen peroxide electrolysis production system. According to the hydrogen peroxide supply device for the wood pulp bleaching process, in order to better control the flow of alkaline hydrogen peroxide, high-purity oxygen is stably supplied through the oxygen generator, and the liquid caustic soda pressure is stabilized and impurities are filtered through the liquid caustic soda pressure stabilizing and filtering device, so that the stable quality of the generated alkaline hydrogen peroxide is ensured; the alkaline hydrogen peroxide outlet flow meter and the alkaline hydrogen peroxide discharging pump work cooperatively, the flow of the alkaline hydrogen peroxide can be accurately controlled according to actual requirements, accurate supply is achieved, and the problem that the bleaching effect is unstable due to fluctuation of the dosage of the hydrogen peroxide is solved.

The utility model provides a device for bleaching slurry by ozone, which comprises a tank body, a stirring device is arranged from the top to the bottom of the tank body in a penetrating manner, the top of the tank body is provided with a feeding device and a tail gas discharge port, and the bottom of the tank body is provided with a discharge port; the tank body is divided into at least one reaction chamber by a reaction chamber bottom plate in the axial direction of the stirring device, the reaction chamber bottom plate with the hollow interior is arranged at the bottom of the reaction chamber, and a gas exhaust port is formed in the reaction chamber bottom plate; an ozone inlet is formed in the outer side wall of the reaction chamber and is communicated with the hollow position of the bottom plate of the reaction chamber. By using the device for bleaching the slurry with the ozone, the slurry can be bleached by fully utilizing the ozone, and the problems of low ozone utilization rate and the like caused by poor uniformity and large heat productivity of the slurry bleached with the ozone can be solved.

The invention relates to the field of pulping and papermaking, in particular to a mediator-free laccase delignification bamboo pulp bleaching method which comprises the following steps: S1, mixing laccase and absolute dry pulp, adjusting pulp concentration, introducing oxygen at a certain temperature for reaction, washing with deionized water, spin-drying and scattering; the absolutely dry pulp is obtained by defibering, screening and drying unbleached chemical bamboo pulp. And S2, carrying out acid pickling chelation on the absolutely dry slurry treated in the step S1. And S3, bleaching the absolutely dry slurry treated in the step S2. According to the method, the lignin in the bamboo pulp is efficiently removed, the kappa number is reduced by more than 40%, the biological enzyme is directly used for replacing about 30% of total chemicals under the condition of not changing the section of an oxygen removal tower in the original process, and the consumption of chemicals and the discharge of bleaching wastewater in industrial production are reduced; and meanwhile, no expensive mediator is added, so that the problem of corrosion of the mediator to equipment is avoided, and the maintenance cost is greatly reduced.

The present invention addresses the problem of providing packaging paper having satisfactory printability and a satisfactory "stiffness feeling".　The problem is solved by packaging paper comprising a paper substrate containing pulp and at least one coating layer on at least one surface of the paper substrate, wherein: the at least one coating layer contains a white inorganic pigment and a binder; the total content of pulp selected from the group consisting of unbleached softwood kraft pulp, bleached softwood kraft pulp, unbleached hardwood kraft pulp, and bleached hardwood kraft pulp in the paper substrate is 70 mass% or more relative to the total mass of pulp contained in the paper substrate; the thickness of the packaging paper is 70-170 μm; and the relationship between the elastic modulus A (MPa) in the cross direction (CD) of the packaging paper and the thickness B (μm) of the packaging paper satisfies A / B = 18 to 55.

The invention provides a cotton linter pulp bleaching agent, a preparation method and a bleaching method. The cotton linter pulp bleaching agent comprises a hydrogen bond acceptor and a hydrogen bond donor, the hydrogen bond acceptor is squaramide, and the hydrogen bond donor is a carboxyl-containing organic matter. The cotton linter pulp bleaching agent provided by the invention is good in stability and good in bleaching effect, and does not excessively consume water resources.

The invention discloses a laccase mutant and application thereof, the mutant is obtained by mutating wild laccase BstCotA from bacillus subtilis, the amino acid sequence of the mutant is as shown in SEQ ID NO.1, and the mutant is mutated into at least one of E186A, N65G, D185G and N311G. The invention further discloses a preparation method of the laccase mutant. Compared with a wild type, the mutant has the advantages that the catalytic activity is obviously improved, and the relative enzyme activity is higher under the conditions that the temperature is 37 DEG C and the pH value is 5.0; the pH stability and the thermal stability are enhanced, and the activity in the range of 40-90 DEG C exceeds 75%; the dye decolorization efficiency is higher, the decolorization rate of amino black 10B reaches 28%-35%, the decolorization rate of crystal violet reaches 35%-45%, and complex printing and dyeing wastewater can be efficiently treated; the lignin degradation capacity is better, the degradation rates within 1 hour and 2 hours are higher than those of the wild type, and pulping bleaching and biomass resource utilization are facilitated.

The invention relates to the field of papermaking, and particularly provides a light-weight paper-based material reinforcing method which comprises the following steps: S100, pulping bleached chemical pulp, adding a reinforcing agent, and carrying out papermaking on a net to obtain finished paper; s200, the surface of finished paper is coated with the polyvinyl alcohol / nanocellulose coating, and after drying treatment, a paper-based material is obtained; s300, carrying out calendering treatment on the paper-based material to obtain a light-weight paper-based material; wherein the reinforcing agent comprises a dry strength agent and a wet strength agent. According to the invention, multi-dimensional synergistic enhancement is adopted, so that the light weight of the paper is ensured, and meanwhile, the dry and wet strength, the surface performance and the overall structure compactness of the paper are remarkably improved.

The utility model relates to the technical field of bleaching equipment, and discloses paper pulp bleaching equipment which is characterized in that a stirring rod is arranged in a tank body, and a main rod of the stirring rod is designed to be a rectangular rod; a telescopic assembly is arranged at the top of the tank body and comprises a rod body, the bottom end of the rod body penetrates through the top of the tank body and is rotationally connected with the tank body, and a stirring rod penetrates through the rod body; the first bevel gear is fixedly arranged on the outer side wall of the rod body in a sleeving mode. The motor I is arranged at the top of the tank body; the bevel gear II is arranged on an output shaft of the motor I and is meshed with the bevel gear I; the top plate is arranged at the top of the stirring rod; according to the bleaching equipment, the telescopic assembly drives a first bevel gear and a second bevel gear to be engaged through a first motor to drive a stirring rod to rotate, meanwhile, a second motor drives an extrusion block to move the stirring rod up and down, and the mixing effect of the stirring rod is improved. According to the bleaching equipment, the protection assembly can shield and protect the exposed part of the assembly through the guardrail, and mistaken touch of workers is avoided.

The invention belongs to the technical field of preservative paper preparation, and particularly relates to composite antibacterial preservative packaging paper as well as a preparation method and application thereof. The preparation method of the composite antibacterial fresh-keeping packaging paper comprises the following steps: firstly, mixing and pulping bleached bamboo pulp and broadleaf wood chemithermomechanical pulp, adding aluminum sulfate, rosin size, a wet strength agent PAE and sodium hexametaphosphate, and performing papermaking and forming; then, essential oil is added into starch gelatinization liquid composed of oxidized corn starch and an epsilon-polylysine hydrochloride solution, a fresh-keeping coating emulsion is obtained through emulsification, and finally, the composite antibacterial fresh-keeping packaging paper is obtained through coating and drying. According to the composite antibacterial fresh-keeping packaging paper disclosed by the invention, fresh-keeping coated paper is prepared by adopting the natural antibacterial agent, the bamboo pulp fiber and other raw materials and matching with the oxidized corn starch through a specific process, and the composite antibacterial fresh-keeping packaging paper has the characteristics of bacteriostasis, environmental friendliness and stability and safety in use, can be used as fresh-keeping packaging paper or fresh-keeping packing paper, effectively delays the decay of various fruits, and is suitable for being used in multiple scenes; the invention also provides a preparation method thereof.

The invention belongs to the field of clean production of paper pulp bleaching in pulping and papermaking industries, and discloses an AOX reduction agent for a chlorine dioxide paper pulp bleaching section and application of the AOX reduction agent. The agent for AOX reduction in the chlorine dioxide paper pulp bleaching section comprises an agent A and an agent B. The agent A comprises at least one of micromolecular organic acid A1 and aminocarboxylic acid A2. And the agent B is peroxy acid salt. An agent A and an agent B are added at the same time in acidic and heated chlorine dioxide bleaching sections, carbon center free radicals with dehalogenation activity are generated in situ, the free radicals selectively break C-Cl bonds of organic halides through a single electron transfer mechanism, chlorine atoms are converted into chloride ions, and therefore in-situ removal of AOX is achieved. According to the AOX decrement agent and the application method thereof provided by the invention, the generation amount of AOX can be obviously reduced by 55-80%, and the whiteness and viscosity of paper are not sacrificed.

The invention belongs to the technical field of pulping and papermaking, and discloses a paper pulp hydrogen peroxide bleaching accelerant with a nitrilotriacetic acid metal complex as an active component and an application method of the paper pulp hydrogen peroxide bleaching accelerant. The bleaching promoting agent is a mixture of a nitrilotriacetic acid metal complex and free nitrilotriacetic acid salt; according to the amount of substance, the ratio of the nitrilotriacetic acid metal complex to the free nitrilotriacetic acid salt is 1: (R1), and R is 7.8-1000. The obtained complex not only can catalyze hydrogen peroxide to continuously generate. OH and singlet oxygen (O2), but also can continuously output active oxygen and improve oxidation selectivity due to the fact that the consumption rate of the complex to. OH is low, so that the paper pulp bleaching efficiency is remarkably improved, the use amount of hydrogen peroxide can be effectively reduced, and degradation of pulp fibers is reduced.

This utility model discloses a static sulfuric acid dilution system for pulping and bleaching, including a static diluter and a medium-consistency riser. One side of the static diluter is equipped with a process water injection nozzle and a sulfuric acid injection nozzle, while the other side has a discharge port. The process water injection nozzle is connected to a process water inlet pipe, which is equipped with a process water flow meter and a process water regulating valve. The sulfuric acid injection nozzle is connected to a sulfuric acid feed pipe, which is equipped with a concentrated sulfuric acid on / off valve, a concentrated sulfuric acid flow meter, and a concentrated sulfuric acid regulating valve. A dilute sulfuric acid injection nozzle is located above the medium-consistency riser and is connected to the discharge port of the static diluter via a dilute sulfuric acid pipe. The bottom of the medium-consistency riser is connected to a pulp conveying pipe. This utility model effectively monitors the sulfuric acid dilution process, ensuring stable system operation and data accuracy, achieving automated operation, improving dilution efficiency, reducing operational risks, and can be designed with a modular structure for easy installation, maintenance, and expansion.

The utility model belongs to the technical field of equipment, and particularly relates to a stirring device for paper pulp bleaching, which comprises a stirrer, a motor is fixedly mounted at the top end of the stirrer, the output end of the motor is fixedly connected with a rotating rod, a plurality of stirring rods are fixedly mounted outside the rotating rod, and stirring plates are fixedly mounted at the upper ends of the stirring rods. The stirring device with a better mixing effect is arranged, the scraping rod is installed at the bottom end in the device, the through groove is formed in the scraping rod, paper pulp at the bottom end can be scraped, the paper pulp is prevented from being accumulated at the bottom, the check blocks are installed on the inner side wall of the device, the paper pulp can be fully dispersed during stirring, and the stirring efficiency is improved. A motor drives an internal rotating rod to rotate, stirring rods are fixedly mounted on the periphery of the rotating rod, and a stirring plate is mounted at the upper end of each stirring rod, so that internal paper pulp is driven to rotate sufficiently during rotation, the bleaching agent is dispersed and fused with the paper pulp, stirring operation can be quickly performed, and the working efficiency is improved.

The invention relates to the technical field of biology, in particular to beta-1, 4-endo-xylanase XlyAE10, a coding gene and application of the beta-1, 4-endo-xylanase XlyAE10, the beta-1, 4-endo-xylanase XlyAE10 is excellent in property and good in pH stability and heat resistance, the optimum temperature of the xylanase XlyAE10 is 60.0 DEG C, the optimum pH value of the xylanase XlyAE10 is 5.5, 50% of activity is still kept in the pH range of 4.0-9.0, the enzyme activity of the xylanase XlyAE10 at the temperature of 65.0 DEG C is 93.26%, and the xylanase XlyAE10 has the advantages that the xylanase XlyAE10 can be used for preparing the xylanase The method can be applied to high-temperature biotechnology fields such as food, feed, textile, paper pulp bleaching and energy development, and has a wide application prospect.

The invention relates to the technical field of pulping and papermaking, and discloses a hydrotalcite-based hydrogen peroxide bleaching stabilizer and application thereof. The hydrotalcite material serving as the hydrogen peroxide bleaching stabilizer is applied to the paper pulp bleaching process, the concentration of heavy metal ions in paper pulp can be reduced, and therefore the bleaching efficiency is improved; water body pollution is not caused in the bleaching process, and complicated post-treatment is not needed; when MgAl-SiO3 is used as a hydrogen peroxide bleaching stabilizer, an alkaline environment can be provided for H2O2, the generation of silicon scale is reduced, and the continuity of paper pulp bleaching is ensured.

The invention discloses laccase and application thereof, and belongs to the field of bioengineering. The high-activity laccase Lac-11 is obtained through database mining, and compared with existing high-activity laccase BstCotA, the high-activity laccase Lac-11 has the following beneficial effects that 1, the enzyme activity is remarkably improved, the enzyme activity is improved by nearly 50% under the conditions that the temperature is 37 DEG C and the pH is 5.0, and the industrial enzyme cost is reduced; 2, the pH stability is higher, the enzyme activity retention rate is higher in the pH range of 5.0-8.0, and the method is suitable for wider acid-base environments. And 3, the thermal stability is better, the stability at the medium-high temperature interval of 50-80 DEG C is obviously higher than that of a control enzyme, and the method is suitable for an industrial high-temperature process. 4, the dye decolorization efficiency is higher, the decolorization rates of amino black 10B and crystal violet respectively reach 31% and 37%, and printing and dyeing wastewater can be efficiently treated. And 5, the lignin degradation capacity is outstanding, the degradation rates within 1 hour, 2 hours and 24 hours are 22%, 25% and 58% respectively, and pulping bleaching and biomass recycling are facilitated.

The invention provides a production method of an environment-friendly paper-based material, which comprises the following steps: step 1, mixing and pulping bleached softwood pulp and bleached hardwood pulp, carrying out pulp mixing, carrying out on-net papermaking molding, drying molded paper sheets, and carrying out soft calendering treatment to obtain a base paper material of which one surface is a rough surface and the other surface is a smooth surface and the smooth surface roughness is less than or equal to 3.0 mu m; step 2, the smooth surface of the base paper material is coated with a first coating without distinguishing the sequence, and the first coating is one of an ultra-high-gloss coating, a high-gloss coating, a matte coating and a matte high-impermeability coating; the rough surface of the base paper material is coated with a second coating, and the second coating is one of oxidized starch, sodium carboxymethyl cellulose (CMC), polyvinyl alcohol (PVA17-99) and an acrylate copolymer; and step 3, drying the paper material coated with the coating to obtain the environment-friendly paper-based material. The forming performance and the folding performance of the paper-based material in practical application can be improved.

The invention provides a preparation method for producing thermal sublimation paper by using a composite three-roller two-pressure combined paper conveying belt, which comprises the following steps of: mixing and pulping bleached sulfate hardwood pulp and softwood pulp, adding cationic starch, a dry strength agent, a wet strength agent, alkenyl succinic anhydride, positive polymer polyacrylamide and colloidal silicon dioxide into the pulp, and uniformly stirring; after the fourdrinier net and the top net are formed, squeezing is carried out in a combined three-roller two-pressing mode, three rollers comprise a suction-moving squeezing vacuum roller, a center roller and a shoe pressing roller, two-pressing comprises first-time squeezing dehydration and second-time squeezing dehydration, the whole wet paper web is in complete contact with a belt, and the wet paper web and the belt synchronous with the center roller are subjected to drying, closed paper injection, surface sizing, drying, soft press polishing and curling together; obtaining a finished product. The coating of the heat sublimation paper produced by the method can be reduced to 3 gsm, the smoothness can reach 200 s or above, the transfer printing rate is improved, the color on the cloth is good, and the paper prepared by the method can further reduce the coating weight and the production cost.

The invention discloses a paper pulp bleaching method based on electric field gradient coupling oxygen nucleus. The method comprises the following steps: adding paper pulp into a reaction kettle, adding alkali and a protective agent, uniformly stirring and mixing, and heating; when heating to 90-100 DEG C, keeping the temperature, stirring at a high speed, applying a direct-current electric field into the reaction kettle, introducing oxygen, and reacting for 3-5 minutes; and reacting for 30-120 minutes under low-speed stirring. The method solves the problems of low reaction efficiency and low oxygen utilization rate in the existing oxygen delignification process. A direct-current electric field is applied to the outer wall of the reaction kettle, oxygen molecule charges are separated by means of electric field force, and the combining capacity with the paper pulp fiber surface is improved. According to the method, the removal efficiency of lignin is remarkably improved, and the whiteness and kappa number of the paper pulp are remarkably improved. The method is suitable for the field of pulping and papermaking, and particularly has important significance on a bleaching process with relatively high environmental protection requirements.