21results about "Retention agents addition" patented technology

The present invention generally relates to methods and compositions for manufacture of tissue, paper, or board and for enhancing retention and drainage thereof. In particular, the disclosure provides methods for enhancing retention and drainage by addition of a retention and drainage aid comprising quick inversion cationic emulsion polyacrylamides (QIC-EPAMS) and polyvinylamine (PVAm) polymers Preparation of paper sheets under these conditions provides improved retention, gravimetric drainage rates, and DDA drainage time, without over-flocculation and allowed for significant decrease in PVAm dosage.

This invention relates to a method for manufacturing paper or paperboard from a fiber suspension, the method comprising the following steps: a) injecting a P3 polymer into a cellulose fiber suspension; b) forming paper or paperboard; c) drying the paper or paperboard. Prior to step a), a P3 polymer is prepared from a water-soluble P1 polymer of at least one nonionic monomer selected from acrylamide, methacrylamide, N,N-dimethylacrylamide, and acrylonitrile. The P1 polymer is subjected to a Re1 reaction to obtain a P2 polymer, which is then subjected to a Re2 reaction to obtain the P3 polymer. The P3 polymer is then subjected to a Re2 reaction. The e1 reaction is injected into the fiber suspension within 24 hours of the start of the reaction; the -Re1 reaction comprises the preparation of a P2 polymer containing an isocyanate functional group by reacting (i) an alkali metal hydroxide and / or an alkaline earth metal hydroxide, (ii) an alkali metal hypohalide and / or an alkaline earth metal hypohalide and (iii) a P1 polymer for 10 seconds to 60 minutes; the -Re2 reaction comprises the preparation of a P3 polymer by reacting (iv) a compound containing at least one aldehyde functional group or a compound capable of generating at least one aldehyde functional group with (v) a P2 polymer containing an isocyanate functional group.

To provide a papermaking method for a papermaking raw material using a yield improving system in a papermaking process, wherein the papermaking method can achieve improved yield of the papermaking raw material without causing decrease in freeness and water squeezing property while elevating the addition rate.SOLUTION: By applying a papermaking method where a cationic or an amphoteric water-soluble polymer having a specific composition is added to a papermaking raw material before paper-making, followed by adding an anionic water-soluble polymer having a specific composition and an intrinsic viscosity of 7dl / g or under as measured in a 1 normal saline solution at 25°C, improvement of its yield can be achieved without decreasing freeness. Preferably, the intrinsic viscosity of the cationic or amphoteric water-soluble polymer, measured in the 1 normal saline solution at 25°C, is 15-30 dl / g.SELECTED DRAWING: None

The application discloses a hollow paper tube and a preparation method and application of the hollow paper tube as a hollow cooling section of a heating cigarette filter, and belongs to the technical field of novel cigarettes. Inorganic fibers and plant fibers are mixed and beaten to obtain mixed fiber pulp, the mixed fiber pulp is treated by soaking in a sodium hydroxide solution, calcium carbonate, an inorganic adhesive and a retention aid are added and stirred uniformly, and then, screen forming, drying and slitting are sequentially performed to obtain raw paper, and the raw paper is spirally formed and rolled into a hollow paper tube. The hollow paper tube can guarantee the flexibility of paper, has good stiffness and resilience, effectively solves the problem that the paper tube is easily deformed irreversibly when being pressed during compounding with a cellulose acetate filter section, and greatly reduces the loss rate of the hollow paper tube during the compounding process.

The application discloses a kind of photothermal dark degradable paper mulch and preparation method thereof, belong to mulch production field.The preparation method of the paper mulch includes: S1.lignite powder, alkaline substance is mixed with appropriate amount of water, heated stirring, solid-liquid separation, obtain solid-state lignite residue and lignite extraction liquid;S2.solid-state lignite residue is mixed with appropriate amount of wood pulp, water, retention and drainage aid, fully stir, obtain lignite residue filled dark wood pulp fiber;S3.with dark wood pulp fiber preparation dark base paper;S4.with lignite extraction liquid and polycondensation active compound preparation impregnation water-based resin;S5.dark base paper impregnation absorbs water-based resin, through drying, the crosslinking solidification of resin is completed in the process that paper is dried, obtain photothermal dark degradable paper mulch.Compared with prior art, the photothermal dark degradable paper mulch of the application has excellent photothermal heating performance, mechanical strength, weed control effect, soil improvement potential and full biodegradable characteristics.

The application belongs to the technical field of paper product manufacturing, and discloses a food-grade antibacterial and mildew-proof paper pulp, a paper product and a preparation method of the paper product. The paper product is prepared by papermaking and drying of the paper pulp. The food-grade antibacterial and mildew-proof paper pulp comprises the following components in parts by weight: 100 parts of pulp for household paper, 0.1-0.3 parts of sodium alginate, 0.5-1 parts of a retention aid, 4-10 parts of a slow-release antibacterial and mildew-proof agent, and 0.8-1.5 parts of a wet strength agent. The slow-release antibacterial and mildew-proof agent is prepared by coating MOF-ELA-THY with chitosan. The MOF in the MOF-ELA-THY is prepared from zinc ions and two ligands of citric acid and malic acid. The chitosan is first subjected to antibacterial and degradation treatment, and then gradually exposes the MOF-ELA-THY. The MOF is hydrolyzed to release zinc ions and ELA and THY, thereby endowing the paper towel with long-acting antibacterial performance. In addition, the THY emits a fragrance, thereby judging the persistence of the antibacterial performance of the paper towel.

This invention provides a method for preparing barrier-type flesh-coated base paper, comprising: mixing softwood pulp and hardwood pulp at an oven-dry weight ratio of (30-40):(60-70), beating the pulp to a freeness of 36-42°SR, and sequentially adding a wet strength agent and a retention aid; after forming the pulp, when the wet paper sheet dryness is 23-30%, using 90-120... The paper is pressed under a linear pressure of kN / m, then dried and creased at 15-22% to obtain the base paper for wrapping meat. Through the synergy of the above processes, the resulting base paper has a density ≥0.60g / cm³, an air permeability of 1.0-5.0μm / (Pa·s), a 60-second Cobb value ≤35g / m² for refined lard (35℃), and a wet tensile strength significantly higher than that of ordinary kitchen paper. This invention effectively solves the problems of easy tearing and oil leakage when conventional kitchen paper is used to wrap fresh meat at a cost close to that of household paper, while also having good air permeability.

This invention relates to a method for manufacturing dried commercial pulp sheets, which includes adding a polymer composition.

The present invention relates to the use of a non-anionic functionalized polymer in pulp and paper industry as retention aids.

The invention relates to a novel water-soluble dialdehyde-functionalized polymer, a method for its preparation and its use, in particular in the field of paper or paperboard manufacturing.

The application relates to the technical field of water filtering agents, and provides a papermaking pulp water filtering agent and a preparation method and application thereof, raw materials of the papermaking pulp water filtering agent are prepared in weight parts, and the raw materials include 30-45 parts of acrylamide, 8-14 parts of active hydroxyl crosslinking monomers, 6-10 parts of methacryloyloxyethyl trimethyl ammonium chloride, 4-8 parts of N-vinyl pyrrolidone, 0.2-0.5 parts of ammonium persulfate, 0.1-0.4 parts of sodium bisulfite, 4-6 parts of glyoxal aqueous solution, 0.5-1.5 parts of a buffer stabilizer, 0.5-1.1 parts of sodium hypophosphite, 1.5-4.5 parts of core-shell structure polydopamine coated silica microspheres, 2-5 parts of benzene boronic acid functionalized oxidized glucomannan and 50-70 parts of deionized water. The components in the application have a synergistic effect, so that the prepared papermaking pulp water filtering agent can improve the pulp water filtering efficiency and guarantee the stability of the physical strength of paper.

The application provides a degradable paper pulp molded product and a preparation method thereof, and comprises the following raw materials in mass fractions: waste paper pulp suspension 50-55 parts, cellulose 25-30 parts, liquor of enzyme hydrolysis of distiller's grains 10-15 parts, modified filler 6-10 parts, waterproof agent 5-7 parts, retention aid 0.03-0.07 parts, and bleaching agent 1-2 parts. The specific waste paper pulp suspension, cellulose, liquor of enzyme hydrolysis of distiller's grains and modified filler are used as raw materials, and the raw materials interact with each other and synergistically, so that the comprehensive performance of the degradable paper pulp molded product is improved.

This invention discloses a papermaking strengthening agent, its preparation method, and its application. The papermaking strengthening agent comprises a nanocellulose suspension and a cationic starch gelatinized liquid, mixed at an oven-dry mass ratio of 1:0.5 to 1:5. The ring crush strength of the paper is increased by 24.3%, and by 18.8% compared to CNF alone; the tensile strength is increased by 14.8% compared to the blank, and by 6.2% compared to CNF alone, demonstrating a significant synergistic effect. This invention is particularly suitable for corrugated base paper, linerboard, and other packaging papers made from waste paper pulp, effectively improving ring crush strength and reducing chemical costs, thus possessing industrial application value.

The present application belongs to the field of papermaking, and particularly relates to a manufacturing method of hand notebook paper, comprising the following steps: wood pulp is prepared for papermaking, then concentrated pulp screening, material adjusting, pulp beating, sand and gas removing, sizing, paper machine screening, net section dehydration molding, pressing, pre-drying, surface sizing, post-drying, calendering, and obtaining the hand notebook paper. The present application optimizes the conditions of key papermaking processes such as papermaking preparation, pulp beating and surface sizing, and obtains high-quality hand notebook paper. The hand notebook paper manufactured by the method has super-high opacity, uniform thickness, good evenness, high smoothness and long-term storage resistance.

This invention provides a thin, lightweight para-aramid paper, its preparation method, and its applications. The para-aramid paper prepared by this method has a basis weight of 5-30 g / m³. 2 The thickness is 0.01~0.04 mm. This method first prepares pulp A and pulp B, which are then processed to obtain the finished para-aramid paper. Pulp A directly uses oil-free para-aramid short fibers, avoiding the washing process of oily short fibers and reducing secondary pollution and wastewater disposal caused by washing oily short fibers. Pulp B uses specific types of nanofibers, and a binary retention aid composed of CPAM and ACPAM is added to these nanofibers. This facilitates the formation of micro-floc structures by the nanofibers, thereby improving the retention rate and filtration speed of the nanofibers, enabling continuous production of para-aramid paper. The addition of the aid enhances the hydrogen bonding between the nanofibers and chopped fibers, improving paper uniformity and thus increasing paper strength.

The application discloses a kind of preparation methods of high-thermal-conductivity cellulose insulating paper, belong to insulating paper technical field.The method includes: to unbleached needle leaf pulp is pretreated and controls beating degree, it is mixed with the boron nitride high-thermal-conductivity filler that TEMPO cellulose nanofiber dispersion processing is handled, and uniform composite slurry is formed;Subsequently, it is formed by sheet forming, in the forming process, add binary retention system by specific component composition, again, dehydration, drying and polishing treatment, and the high-thermal-conductivity cellulose insulating paper is prepared.The method effectively improves the dispersibility and retention rate of filler in paper sheet, significantly enhances the thermal conductivity of paper, while maintaining good electrical insulation strength, can satisfy the comprehensive requirements of ultra-high voltage transformer to insulating material thermal conductivity and insulation performance.

The present invention relates to a multi-ply liner for use as a packaging material for food or beverages, the multi-ply liner comprising a first ply and a second ply, wherein the first ply comprises at least 70 wt% unbleached kraft pulp and less than 30 wt% neutral sulfite semi-chemical (NSSC) pulp based on dry weight, and the second ply comprises at least 50 wt% NSSC pulp and less than 50 wt% unbleached kraft pulp based on dry weight, and the NSSC pulp in the second ply is a washed NSSC pulp having an ash content of less than 1.8 wt% determined in accordance with ISO standard 1762:2019. The present invention further relates to a method for manufacturing the multi-ply liner.

The present invention relates to the use of a non-anionic functionalized polymer in water or wastewater treatment as a coagulant.

The present invention relates to a multi-ply liner for use in food or beverage packaging materials, said multi-ply liner comprising: a first ply, and a second ply, wherein said first ply comprises at least 70 wt% unbleached kraft pulp and less than 30 wt% neutral sulfite semi chemical (NSSC) pulp based on dry weight, wherein said second ply comprises at least 50 wt% NSSC pulp and less than 50 wt% unbleached kraft pulp based on dry weight, and wherein said NSSC pulp in the second ply is a washed NSSC pulp which has an ash content of less than 1.8 wt%, as determined according to standard ISO 1762:2019. The present invention further relates to a method for manufacturing said multi-ply liner.

The present application relates to the technical field of papermaking, in particular to a method for improving the retention rate of white cardboard and white cardboard. The following steps are combined: a high-concentration grinding step: the mechanical pulp used for white cardboard production is treated by high-concentration grinding to reduce the generation of fine fibers and enhance the fiber bonding capacity; a charge adjusting step: a charge adjusting agent such as aluminum sulfate is added to the pulp to neutralize anionic impurities and ensure the efficiency of chemicals; a micro-particle flocculation step: a multi-component micro-particle retention system composed of cationic starch, high molecular weight polymer flocculants and silica sol is added to the charge-adjusted pulp to efficiently flocculate and retain fine components. Through the synergistic effect of source physical control, process chemical environment optimization and terminal efficient capture, the present application can improve the comprehensive retention rate of white cardboard to more than 88%, the core layer retention rate to more than 90%, significantly reduce the production cost, improve the paper quality and the running stability of the paper machine.