77results about "Biocidal agent addition" patented technology

The invention discloses a bacteriostatic and antiviral bamboo pulp paper-based sanitary isolation bag as well as a preparation method and application thereof, and belongs to the field of functional paper-based packaging materials. The isolation bag takes bamboo pulp fiber paper as a base material, and the surface of the isolation bag is coated with a water-based polyhydroxyalkanoate functional coating. According to the preparation method, a special polyphenol derivative-chitosan quaternary ammonium salt-nano zinc oxide organic-inorganic hybrid factor is introduced, and the problem of agglomeration of nano particles is effectively solved by utilizing the special bridging effect of polyphenol, so that high-density cation capture and oxidation inactivation sites are constructed on the surface of the coating. Compared with the prior art, the method has the advantages that the method does not need to depend on organic fluorine compounds, and the excellent waterproof and oil-proof barrier effect and the efficient inactivation of viruses can be achieved only through the extremely low coating amount. In addition, the isolation bag has unique environmental chemical responsiveness, can be efficiently dissociated under the alkaline condition to facilitate repulping recovery, can be completely biodegraded in the natural environment, and perfectly considers the requirements of biological safety protection and green environmental protection.

The invention discloses a packaging box special for medical treatment, and relates to the field of packaging boxes for medical treatment. The plant fiber composite material is prepared from the following raw materials in parts by weight: 80-95 parts of plant fiber slurry, 3-10 parts of chitosan, 5-15 parts of polylactic acid, 1-5 parts of nano silicon dioxide, 0.5-3 parts of an environment-friendly water repellent agent, 2-8 parts of reinforced fibers, 3-8 parts of a reversible moisture absorption phase change material and 0.1-0.5 part of a degradation indicating pigment. The plant fiber slurry is adopted as a bio-based framework, chitosan microfibers, polylactic acid, nano silicon dioxide, a reversible moisture absorption phase change material and other functional components are innovatively introduced, and an antibacterial trigger layer and degradation indication pigment on the inner surface are matched, so that the packaging box keeps good mechanical strength and structural stability, and meanwhile the packaging box has the advantages that the packaging box is not prone to deformation, and the service life is prolonged. And multiple functions of active on-demand antibiosis, dynamic humidity adjustment, visual degradation tracking and full bio-based degradability are achieved.

The application relates to the technical field of antibacterial and antiviral plates, and discloses a composite antibacterial and antiviral plate and a composite antibacterial and antiviral agent, which comprises two substrates, the two substrates are provided with balance layers at one end, adhesive agents are arranged between the two substrates and the two balance layers, and antibacterial and antiviral impregnated decorative papers are arranged between the two balance layers. The composite antibacterial and antiviral plate is formed by combining various antibacterial and antiviral technologies to form a novel composite antibacterial and antiviral agent. Compared with general antibacterial or antiviral plates, the antibacterial and antiviral plate has a synergistic effect, and the performance of single antibacterial or antiviral function is increased by 30%. Meanwhile, the antibacterial and antiviral components are more uniformly dispersed in the system through synergistic effect and porous nano structure, and the consumption of effective components is reduced through ion replacement effect, so that the effect of slow release of effective components is achieved, and the antibacterial and antiviral service life is prolonged.

A method for controlling papermaking, comprising: monitoring the liquid level of a fibrous suspension in a reservoir (302); identifying that the liquid level has dropped so as to meet at least one empty criterion (303), and then identifying that the liquid level has risen so as to meet at least one replenishment criterion; and starting to administer a biocide to the fibrous suspension flowing into the reservoir in response to identifying that the liquid level has risen so as to meet at least one replenishment criterion. A corresponding device and computer program are also disclosed.

This invention belongs to the field of papermaking technology, specifically relating to a coating for improving doctor blade marks on coated white cardboard and its preparation method. The coating for improving doctor blade marks on coated white cardboard includes the following raw materials: calcium carbonate grade 95 slurry, kaolin slurry, latex, CMC slurry, dispersant, lubricant, water-resistant agent, bactericide, defoamer, and alkaline solution. The preparation method of the CMC slurry is as follows: water and CMC are added to a reaction vessel, the temperature is raised, and the mixture is stirred, controlling the solid content of the CMC slurry at 10-12% and the viscosity at 2500-3000 cps. This invention controls the static water retention value of the coating to 120-130 g / m³ by controlling the solid content and viscosity of the CMC slurry during preparation. 2 This improved the problem of scraper marks caused by coating during the production of white cardboard; by controlling the order of raw material feeding, coating viscosity and water retention value, the dispersibility of the coating was improved, further improving the problem of scraper marks caused by coating during the production of white cardboard.

The invention discloses antibacterial toilet paper and a processing method thereof, and particularly relates to the technical field of papermaking. The antibacterial toilet paper is composed of a natural antibacterial agent, a modified inorganic antibacterial agent, microcapsules and optimized paper pulp, the natural antibacterial agent comprises a wormwood extract and a honeysuckle extract, the modified inorganic antibacterial agent is nano zinc oxide with hydroxyl grafted on the surface, and the microcapsules are chitosan microcapsules. The processing method of the antibacterial toilet paper comprises the steps of pulp pretreatment and enzymolysis pulping, ultrasonic dispersion and coupling of a composite antibacterial agent, mixed pulp reaction, fourdrinier papermaking forming, low-temperature drying and micro-calendering, surface chitosan solution spraying treatment and silicone oil dipping treatment. Through the synergistic effect of a natural-inorganic composite antibacterial system, microcapsule coating slow release and fiber surface modification treatment, firm adhesion and uniform distribution of an antibacterial agent are achieved, the antibacterial durability, broad spectrum and use safety of the antibacterial toilet paper are remarkably improved, and meanwhile the good physical performance and soft touch feeling of the paper are kept.

The present invention concerns a process for the production of packaging for the preservation of food products, the packaging thus obtained consisting of a cellulosic support such as, for example, paper or cardboard, coated with a layer of preferably acrylic or styrene / acrylic polymer resin, in which anionic clays are dispersed, preferably hydrotalcite, intercalated with active molecules.

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.

The present invention provides certain paper enhancing compositions, typically aqueous compositions, for use in the manufacture and coating of paper, and paper products. The paper enhancing compositions provide certain paper processing advantages and distinct final paper product characteristics. The present invention further provides carbonate enhancing composition useful for preparing enhanced carbonate compositions used in the paper manufacturing processes.

The invention discloses a fluoride-free waterproof agent with an antibacterial function as well as a preparation method and application of the fluoride-free waterproof agent. The fluoride-free waterproof agent with the antibacterial function is prepared from the following components in parts by mass: 100 parts of a monomer, 1 to 3 parts of an initiator, 2 to 4 parts of a surfactant, 1 to 2 parts of a chain transfer agent, 50 to 100 parts of a cosolvent and 200 to 400 parts of water, wherein the monomers are prepared from the following components in parts by mass: 20 to 30 parts of organic silicon monomers, 6 to 10 parts of antibacterial functional monomers, 30 to 40 parts of acrylic acid long-chain aliphatic hydrocarbon monomers, 3 to 7 parts of self-crosslinking monomers and 13 to 41 parts of other acrylate monomers. The surfactant is a mixture of a cationic surfactant and a nonionic surfactant. The fluoride-free waterproof agent disclosed by the invention can be applied to surface modification of fiber materials such as textiles, paper and non-woven fabrics, can endow excellent waterproof performance and broad-spectrum antibacterial performance, and has a wide application prospect.

The invention relates to a method for manufacturing a fibrous web, such as web of paper, board, tissue or the like. The method comprises forming an aqueous fibre suspension comprising cellulosic fibres from one or more raw material flows, and applying at least one chemical and / or physical control measure to the aqueous fibre suspension or at least one of its raw material flows for control of microbial activity in the aqueous fibre suspension or the raw material flow before an inlet of an intermediate residence entity, such as storage tower or broke tower, which has a delay time of at least one hour, preferably at least two hours. In this manner a starting ORP value for the aqueous fibre suspension is obtained. The aqueous fibre suspension in the intermediate residence entity at least the minimum delay time, and a final ORP value is measured for the aqueous fibre suspension after an outlet of the said intermediate residence entity but before the formation of the fibrous web. An ORP difference value between the starting ORP and final ORP values is calculated, and if the ORP difference value exceeds a pre-determined threshold value, then adjusting the applied chemical and / or physical control measure(s) until the ORP difference value falls below the pre-determined threshold value. Finally, the aqueous fibre suspension is formed into a fibrous web and dried.

The application discloses a straw fiber base bacteriostatic mulch with temperature and humidity response performance and a preparation method thereof, and belongs to the technical field of agricultural mulch. The straw fiber base bacteriostatic mulch with temperature and humidity response performance comprises, from bottom to top, a bottom film layer, a slow-release layer and a barrier layer. The slow-release layer is obtained by coating a mixed solution of acetic acid, a bactericide, gelatin and a plasticizer onto the bottom film layer. The barrier layer is obtained by coating palm wax emulsion on the surface of the slow-release layer. That is, the straw fiber base bacteriostatic mulch with temperature and humidity response performance is constructed by combining palm wax, a bactericide (carbendazim), gelatin and a wheat straw fiber base mulch. The straw fiber base bacteriostatic mulch can respond to changes in environmental temperature and humidity, realize accurate release of pesticides, and thus accurately control diseases.

The application belongs to the technical field of packaging materials, and particularly relates to a high-barrier coating for a paper blister, a preparation method of the high-barrier coating and a paper blister material. The high-barrier coating for the paper blister is prepared by performing corona treatment on a paper base, then depositing polylysine and bentonite in layers on the surface of the paper base, finally forming a polylysine / bentonite composite layer with a labyrinth effect, densifying the paper, and then coating a film composed of polylactic acid, tea tree oil, acetyl tri-butyl citrate, hydroxypropyl methyl cellulose and Span 80 on the surface of the polylysine / bentonite composite layer, so that the gas barrier property, hydrophobicity and antibacterial and antioxidant property of the paper blister are further improved. Finally, the paper blister material prepared in the application has excellent moisture resistance, high gas barrier property such as oxygen and water vapor, and suitable breaking resistance.

The invention discloses an environment-friendly antibacterial corrugated board and a surface treatment process thereof, the environment-friendly antibacterial corrugated board sequentially comprises an antibacterial composite coating, a pretreated surface paper layer, a first bonding layer, a corrugated core layer, a second bonding layer and a bottom paper layer from outside to inside; the antibacterial composite coating is prepared from the following components in parts by weight: 60-70 parts of bio-based polyurethane emulsion, 5-8 parts of nano zinc oxide, 2-3 parts of sodium alginate, 2-4 parts of polyethylene glycol 400, 0.5-1 part of sodium dodecyl benzene sulfonate and 18-25 parts of deionized water, and the pretreated surface paper layer and the bottom paper layer are raw paper containing a pretreating agent. The pretreatment agent is prepared from the following components in parts by weight: 5-10 parts of wormwood extract, 3-5 parts of chitosan, 1-2 parts of glycerol, 85-92 parts of deionized water and 0.3-0.5 part of citric acid. The invention relates to the technical field of corrugated boards. The paperboard adopts natural environment-friendly raw materials, and is lasting in antibacterial effect, high in physical strength and free of harmful substance residues.

The application discloses a kind of nano copper oxide antibacterial paper, its preparation method and application, the antibacterial paper includes paper base, and the paper base is attached with nano copper oxide and the antibacterial active ingredient extracted from pomegranate peel.The preparation method of the nano copper oxide antibacterial paper includes the following steps: S1 paper is soaked in copper sulfate aqueous solution, and copper sulfate impregnated paper is obtained;S2 copper sulfate impregnated paper is put into pomegranate peel extract, heated, and stirred at impregnation temperature, to obtain nano copper oxide antibacterial paper.The nano copper oxide antibacterial paper prepared by the preparation method described above is used to make wound plaster.The pomegranate peel in the application is reacted with copper ions to generate nano copper oxide with antibacterial effect on paper base, and other antibacterial active ingredients contained in the pomegranate peel attached to the paper base can enhance the antibacterial effect, and play the role of 1+1>2 combined synergistic bacteriostasis.

The application relates to a degradable corrugated paper auxiliary and a preparation method thereof, and belongs to the technical field of packaging materials. The auxiliary comprises, in terms of weight parts, 50 parts of oxidized starch, 6-8 parts of a modified reinforcing agent, 0.5-0.7 parts of a thickening agent, 0.15-0.2 parts of a dispersing agent, 0.1-0.13 parts of an antifoaming agent, 0.02-0.03 parts of a mildew-proof agent and 90-100 parts of water; in the process of sizing and curing, the ethoxysilane of the side chain of the modified reinforcing agent is coupled and condensed with the hydroxyl of the paper fiber, the main chain of the ethoxysilane is clamped in the macromolecular chain of the starch, rivet action is generated, the binding strength between the paper fibers is increased, the paper fibers are not prone to cracking in the bending process, in addition, in the process of coupling and condensation, a fluorine-containing organic silicon water-resistant layer is uniformly introduced to the surface of the paperboard substrate, and the water-resistant stability of the paperboard is effectively improved.

The present disclosure relates to a sterilization paper for wrapping medical devices, barrier to microorganism, a method for manufacturing a sterilization paper and the use of a sterilization paper for wrapping medical devices as a sterile barrier system.

The invention provides biomass composite decorative paper based on nanocellulose enhancement and a preparation method of the biomass composite decorative paper, and belongs to the technical field of decorative paper. The multifunctional synergistic biomass composite material is constructed through chemical modification and in-situ self-assembly strategies: the modified nanocellulose with negative electricity on the surface is used as a skeleton, the cationized chitosan with positive electricity is used as an electrostatic bridge, and the carbon quantum dots and the filler with optical functions are efficiently fixed, so that the dispersity and the retention rate are improved; an introduced tannic acid-zinc metal organic network precursor is cross-linked and cured under hot pressing to form a chemical network, so that the material is endowed with excellent wet strength and antibacterial function; a physical and chemical interpenetrating network is formed in the system, and structural collaboration is achieved; all the functional components also protect and complement each other in the modes of ultraviolet shielding, synergistic antibiosis and the like, so that the material is endowed with excellent and lasting comprehensive performance.

The invention discloses an environment-friendly paper fiber cushion packaging material and a preparation method thereof, and belongs to the technical field of biomass conversion materials. According to the material, plant fiber paper pulp, reinforced fibers and an environment-friendly adhesive serve as main raw materials, a papermaking wet-end process and a physical foaming shaping process are deeply fused, pressurized dissolved gas serves as a pore-forming template, blowing is conducted in a fiber network, locking is conducted through synchronous gel of the adhesive, and a three-dimensional porous cavity structure which is communicated with one another is formed. The preparation method takes water as a medium, and the process is green. The obtained material is light in weight, excellent in buffering performance and capable of being completely biodegraded and recycled, perfectly replaces traditional polystyrene foam, can flexibly achieve the functions of hydrophobicity, flame retardance and the like by adding auxiliaries, and is widely applied to the fields of packaging of electronic products and fragile products, cold-chain logistics and the like.

(a) Antibacterial Compounds According to Formula I [Formula 1] TIFF2025501108000010.tif52170 and (b) an antimicrobial system comprising a stabilized chlorine compound, said compounds being separate compounds or constituting a single composition, In the formula, R1, R2, and R3 independently represent a hydrogen atom; a halogen atom; a hydroxy group; an amino group; an alkylamino group, an alkyl group, a hydroxyalkyl group, an acyl group, a haloalkyl group, or an alkoxy group having 1 to 4 carbon atoms; or an acylamide group having 1 to 10 carbon atoms, A represents 2-thiazolamine; 2-propenenitrile; 2-propenoic acid; an alkyl or hydroxyalkyl ester of 2-propenoic acid having 1 to 4 carbon atoms; or a -CHCHCONR5R6 group, where R5 and R6 independently represent a hydrogen atom, an alkyl or hydroxyalkyl having 1 to 4 carbon atoms; The system, wherein the stabilized chlorine compound comprises a reaction product of a reaction between active chlorine and a nitrogen-based reactant selected from ammonium, urea, carbamate, and dimethylhydantoin.

The application discloses a kind of damp-proof flame-retardant corrugated paperboard and preparation process thereof, belong to paperboard technical field, to solve the technical problems that damp-proof performance, flame-retardant performance and flat pressure strength of corrugated paperboard in prior art need to be further improved, specifically including first plant fiber and waste carton are mixed, and after infiltration, deinking agent is crushed, then with functional inorganic filler, phosphoric acid modified piperazine and preservative are mixed and stirred, are sent into paper machine and are beaten, are formed, are dehydrated, are dried, and are pressed into B type wave-shaped corrugated, after cooling roll shaping, adhesive is evenly coated on the peak tip of corrugated core by roll coater, face paper is pasted on both sides of corrugated core, drying is obtained, and corrugated paperboard is obtained.The application is by the synergistic effect between modified calcium carbonate, modified silicon dioxide, modified aluminum oxide, phosphoric acid modified piperazine and polyurethane emulsion, further improve the damp-proof performance, flame-retardant performance and flat pressure strength of corrugated paperboard.

The invention relates to a method for reducing bacterial endospores in an aqueous fibre suspension comprising recycled cellulosic fibres, wherein the fibre suspension has an original endospore amount, preferably of ≥10 000 CFU / ml. The method comprises adjusting the pH of the fibre suspension to a pH value of ≤6.5, adjusting the oxidation-reduction potential (ORP) of the fibre suspension to an ORP value of ≥200 mV with a first oxidizing agent, and introducing an amount of performic acid as a second oxidizing agent to the fibre suspension for reducing the bacterial endospores to an endospore amount of ≤1000 CFU / ml.

The invention discloses a paper pulp raw material treatment process based on an antibacterial agent, which comprises the following steps: mixing dry plant fiber with an activating agent for pretreatment, curing the pulp at specific pH and temperature to activate the fiber surface, continuously injecting an adaptive liquid antibacterial agent in the pulp conveying process, and continuously stirring to obtain the paper pulp raw material. And the antibacterial slurry is controlled to flow through a pipeline provided with a static mixer at a Reynolds number of 2000-5000. According to the invention, the fiber is pre-modified by using the activating agent, the surface electropositivity and reaction sites of the fiber are increased, and the subsequent antibacterial agent can be efficiently and directionally fixed on the fiber, so that the breeding of microorganisms in the accumulated material of the pipeline is inhibited, the self-cleaning of the production system is realized, and the frequent chemical cleaning step is reduced.

The present invention relates to a method for reducing the load of microbial contaminants in a pulp stock comprising a recycled fiber fraction, said method comprising the following steps performed in sequence: a) providing a pulp stock comprising a recycled fiber fraction at a consistency in the range of 2-10 wt % in water; b) adding a basic oxide selected from the group consisting of calcium oxide (CaO) and sodium oxide (Na2O) to the pulp stock and allowing the basic oxide to react with water to form the corresponding hydroxide, wherein the amount of the basic oxide added is sufficient to raise the pH value of the pulp stock to above 12.5 and to maintain the pH value of the pulp stock above 12.5 for at least 60 minutes; c) allowing the pulp stock to remain at a pH value above 12.5 for at least 60 minutes; and d) adding an organic oxidative acid to the pulp stock, wherein the amount of the organic oxidative acid added is sufficient to reduce the pH value of the pulp stock to below 10.

The invention provides repellent insect-proof packaging paper, which is prepared from the following raw materials in percentage by weight: 50 to 70 percent of paper pulp fiber, 10 to 20 percent of insect-proof compound, 1 to 3 percent of nano-silver composite microsphere, 0.5 to 2 percent of synergistic ether, 5 to 15 percent of light calcium carbonate, 3 to 8 percent of starch glue and 1 to 3 percent of waterproof agent. The insect prevention compound is a deltamethrin / nano-zinc oxide compound coated by microcapsules, and the nano-silver composite microspheres are cellulose microspheres loaded with nano-silver. The preparation method comprises the following steps: uniformly mixing the raw material components, forming by a paper machine, squeezing, drying and calendering. Long-acting slow release of insect-repelling components is achieved through the microcapsule technology, the material is endowed with excellent antibacterial and insect-preventing performance through the nano-silver composite microspheres, meanwhile, the advantages of good mechanical strength, moisture resistance and production cost are considered, and the environment-friendly insect-preventing packaging material is suitable for environment-friendly insect-preventing packaging in the fields of grains, food, medicinal materials and the like.

The present invention relates to a dry wipe, a biodegradable packaging containing the dry wipe, an arrangement comprising the dry wipe and a dispenser container, and a process for providing a wet wipe. The dry wipe comprises a wipe substrate impregnated with at least one additive to be activated by addition of water, wherein the at least one additive is selected from the group consisting of a biocide, a surfactant and a care product, wherein the wipe substrate is configured for allowing a distribution of liquid, even when the dry wipe is stacked in a dispenser container.

The invention relates to a method for manufacturing a fibrous web, such as web of paper, board, tissue or the like. The method comprises forming an aqueous fibre suspension comprising cellulosic fibres from one or more raw material flows, and applying at least one chemical and / or physical control measure to the aqueous fibre suspension or at least one of its raw material flows for control of microbial activity in the aqueous fibre suspension or the raw material flow before an inlet of an intermediate residence entity, such as storage tower or broke tower, which has a delay time of at least one hour, preferably at least two hours. In this manner a starting ORP value for the aqueous fibre suspension is obtained. The aqueous fibre suspension in the intermediate residence entity at least the minimum delay time, and a final ORP value is measured for the aqueous fibre suspension after an outlet of the said intermediate residence entity but before the formation of the fibrous web. An ORP difference value between the starting ORP and final ORP values is calculated, and if the ORP difference value exceeds a pre-determined threshold value, then adjusting the applied chemical and / or physical control measure(s) until the ORP difference value falls below the pre-determined threshold value. Finally, the aqueous fibre suspension is formed into a fibrous web and dried.

The invention discloses a system for transferring a beverage paper cup into a seedling culture container, a preparation method and a conversion method of the system, a fluoride-free biodegradable barrier coating and barrier coating paper, and belongs to the technical field of green packaging and gardening seedling culture supplies. According to the system, a special polyhydroxyalkanoate barrier coating is applied to the inner wall of a paper cup, and a unique opening structure is matched, so that the function switching from a beverage container to a seedling culture container is realized. Compared with a commercially available polyethylene coated paper cup, according to the scheme, through the synergistic effect of the modified starch and the polysorbate, the more excellent barrier effect and processing toughness are achieved while the addition amount of the coalescing agent is reduced. In addition, the packaging material strictly follows the requirements of environmental protection compliance, all components do not contain fluorine-containing substances, and the environmental accumulation risk of the packaging material in the composting process is solved. Through the secondary utilization thought, the scheme not only reduces the resource investment in the seedling raising link, but also conforms to the industry development trend of green packaging and resource recycling in the future, and has remarkable social and economic benefits.

The application discloses a preparation process of a calendered paper with improved calendering firmness, and belongs to the papermaking technical field.The technical scheme is as follows: including pulp plate, chain plate conveying, pulper, unloading pool, defibrator, grinding machine, pulp forming pool, pulp forming pool pump, pre-coating pool, pre-coating pool pump, off-machine white water tank, flushing pulp pump, pressure screen, headbox, net part, pressing part, Yankee dryer, film transfer sizing machine, 1800 dryer, calender, winding part, rewinding, packaging and warehousing;100% bleached kraft pulp is used, the beating degree of the pulp forming is controlled to be 30-35SR, the adding amount of chemical reagents, such as talcum powder, sizing agent AKD, cationic corn starch and retention aid, a new surface sizing agent is added, and the moisture of the paper is controlled, so that the synergistic effect between various factors and conditions is achieved, the paper sheet and the PE film are more closely combined, and the problem of poor calendering in the production process of the calendered paper is solved.

The present application relates to the technical field of strengthening retention aid, and discloses a preparation method of high-efficiency strengthening retention aid containing nanocellulose and application thereof in papermaking, which comprises the following steps: step one: nanocellulose raw materials are added into water for pretreatment, then a modification reagent is added for first modification treatment, so that a modified nanocellulose solution is obtained; step two: starch raw materials and a starch degradation reagent are added into the modified nanocellulose solution for second modification treatment, so that a modified nanocellulose starch solution is obtained; step three: a cationic reagent and a catalyst are added into the modified nanocellulose starch solution for third modification treatment, so that a cationic modification solution is obtained; and step four: a neutralizing reagent, a strengthening agent and a bactericide are added into the cationic modification solution, so that the strengthening retention aid is obtained. Through cationization of nanocellulose and starch, the present application effectively improves the reaction efficiency of cations, and obtains a more stable liquid product, so that the application effect is improved.