500results about "Paper/cardboard" patented technology

The application provides a preparation method of high-conductivity carbon fiber paper and belongs to the technical field of fuel cells. The method comprises the following steps: step 1, dissolving a water-soluble polymer in water to prepare a dispersion liquid with a certain concentration; step 2, dispersing short-cut carbon fibers with a certain thickness of metal plating layer in the dispersion liquid to prepare a fiber slurry; step 3, performing wet papermaking on the slurry, and performing pressing and drying to prepare a raw paper; and step 4, performing high-temperature hot pressing treatment on the raw paper under a reducing atmosphere and a certain pressure to prepare a primary carbon paper. The prepared carbon paper has an electrical resistivity less than 3 mΩ·cm, a porosity greater than 80%, and a gas permeability greater than 2200 ml·mm / [cm 2 ·h·mm·Aq]. The application improves the electrical conductivity of the carbon paper and the gas permeability of the carbon paper, and the process is simple, and the performance of the fuel cell can be obviously improved.

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.

The application discloses a kind of paper efficient surface sizing agent and its preparation method and application.The surface sizing agent includes the following weight percentage components: cationic polymer emulsion 25-55%, AKD emulsion 30-60% and magnesium nitrate 1-10%, wherein the cationic polymer emulsion is prepared by pre-polymerization, polymerization two stages are formed, the cationic polymer emulsion is mixed with AKD emulsion according to certain weight ratio, to obtain composite surface sizing agent.The surface sizing agent provided in the application can be combined with fibers and left on the surface of paper due to its high cationicity, efficiently improving the water resistance of paper, and the ability to resist moisture is improved;At the same time, high retention rate can also give paper better strength performance.

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.

The application discloses a preparation method of nanofibrillated cellulose-based filter material, and steps are as follows: taking bleached coniferous wood pulp as raw material, carrying out pretreatment through biological enzymolysis and mechanical refining, and preparing nanofibrillated cellulose suspension by using a microjet high-pressure homogenizer; mixing the nanofibrillated cellulose suspension with plant fiber pulp according to an absolute dry mass ratio of 1:9-5:5, and forming a gradient pore structure base paper through a double-layer or multi-layer inclined screen paper machine; preparing modified styrene-acrylic emulsion by using a pre-emulsified semi-continuous emulsion polymerization method with acrylic acid, butyl acrylate and styrene as basic monomers and with functional monomers; impregnating and sizing the base paper, controlling the sizing amount to be 5-20 g / m 2 , and obtaining the filter material after drying and solidification. The application has stable and controllable process, and the obtained product has high strength, high filtration precision, good air permeability and water resistance, and can be completely biodegraded, so that the product is environment-friendly and efficient.

The present application relates to a kind of glass fiber filter paper and its preparation method and application.The glass fiber filter paper includes at least three layers of glass fiber layers, and the glass fiber layers between layer and layer are gradient arrangement;Three layers of the outer layer of the glass fiber layer is combined with non-woven fabric layer.The method includes: according to the proportion, at least three kinds of glass fiber, dispersing agent and water are uniformly mixed, and at least three kinds of glass fiber slurry are obtained;At least three kinds of glass fiber slurry are formed on the non-woven fabric laid on the paper forming net, and the glass fiber paper film is formed, is pressed and is initially dried, and at least three layers of dry paper film are obtained;At least three layers of paper film are released at the same speed, at the same time, the non-woven fabric on at least one middle layer paper film is removed, then at least three layers of paper film are glued and combined, and adhesive curing is carried out.The technical problem to be solved is how to make the thickness of glass fiber filter paper less than 0.5mm, the filter material quality less than 110g / m 2 , the breaking strength is higher than 210kPa, while the pollution capacity is higher than 160g / m 2 , and the filtering precision is better than β (10 μm) greater than 300.

Brief Introduction: This invention discloses a 50-160g one-piece, single-piece flame-retardant offset paper and its preparation method. It is compatible with both white and natural colors, and is produced using a single papermaking machine. In-pulp flame retardancy and on-machine online flame-retardant sizing are completed simultaneously, eliminating the need for secondary processing. The product combines excellent printing and writing performance with B1-level flame retardancy, making it suitable for office, printing, writing, and archival paper applications. It features stable processing, comprehensive protection, and high market value.

The utility model discloses a kind of moisture-proof composite corrugated paperboard, it is related to corrugated paperboard field, specifically a kind of moisture-proof composite corrugated paperboard, including bottom layer moisture-proof layer, inner layer corrugated core layer, intermediate barrier layer, outer layer corrugated core layer and surface layer moisture-proof layer from inside to outside are sequentially arranged;The bottom layer moisture-proof layer is PET film kraft paper, the surface layer moisture-proof layer is PE film kraft paper, the intermediate barrier layer is aluminum foil composite paper, the inner layer corrugated core layer is melamine resin modified corrugated paper, the utility model solves the current corrugated paperboard surface using coating single waterproof coating or using single layer plastic film film coating, the moisture-proof effect of this single coating processing mode is limited, and easily failure due to abrasion;Although single layer film can block part liquid water, it is difficult to solve water vapor penetration problem, and interlayer is mostly starch adhesive, swelling peeling after meeting water, cannot satisfy the long-term use demand of high humidity environment problem.

The application provides a high thickness card paper and a preparation method thereof. The preparation method comprises the following steps: papermaking a core layer, wherein the core layer is internally sized; papermaking a surface layer and a bottom layer; performing surface sizing on the outer surfaces of the surface layer and the bottom layer respectively; and the surface sizing agent comprises water, starch and a sizing agent. The preparation method adopts a composite double-layer sizing mode, that is, the core layer is internally sized and the surface layer is surface sized. The starch sizing liquid is uniquely improved in the surface sizing link. When the starch sizing liquid used for surface sizing is prepared, a small amount of specially prepared sizing agent is added. The core layer retains the internal sizing process, can effectively prevent the overall edge penetration of water molecules, maintains the original performance of the non-coated food card paper, avoids problems such as deformation, strength reduction and edge penetration abnormality caused by dampness, and does not need to add traditional rosin internal sizing agent in the surface layer pulp and the bottom layer pulp, which not only simplifies the papermaking production process and reduces the complexity of the sizing process.

The present invention relates to a method for manufacturing a laminate (8) comprising a paper substrate and a microfibrillated cellulose (MFC) layer. An MFC suspension containing 50 to 100% by weight of MFC is provided. A wet MFC layer (1) is formed by casting the suspension onto a metal belt support (2), and the dry content of the formed wet MFC layer (1) is 1 to 40% by weight. A paper substrate having a Gurley-Hill air permeability of less than 10,000 s / 100 ml is provided and joined to the wet MFC layer (1) positioned on the metal belt support (2) to form a laminate structure (6). The laminate structure (6) positioned on the metal belt support (2) is dewatered to form the laminate (8). The dewatering includes at least one drying step including drying by at least one non-contact drying device (7), and the metal belt support (2) is heated during at least one drying step. The present invention also relates to the laminate (8) and a packaging material comprising the laminate (8).

A method of making an absorbent structure including mixing ultra-high molecular weight (“UHMW”) glyoxalated polyvinylamide adducts (“GPVM”) and / or high molecular weight (“HMW”), glyoxalated polyacrylamide and / or high cationic charge glyoxalated polyacrylamide (“GPAM”) copolymers and high molecular weight (“HMW”) anionic polyacrylamide (“APAM”) with the furnish during stock preparation of a wet laid papermaking process.

The present application belongs to the technical field of artificial board, and particularly relates to a high-strength fire-retardant waterproof plywood and a preparation method thereof. The plywood comprises a three-layer structure, and the three layers from top to bottom are a surface layer, an intermediate layer and a bottom layer. The surface layer is a composite structure layer formed by hot pressing and adhering a first bamboo veneer and a decorative paper. The intermediate layer is a wood veneer layer formed by hot pressing and adhering a wood veneer on the side of the first bamboo veneer away from the decorative paper. The fiber direction of the wood veneer and the first bamboo veneer is perpendicular to each other. The bottom layer is a second bamboo veneer layer formed by hot pressing and adhering a second bamboo veneer on the other side of the wood veneer. The fiber direction of the second bamboo veneer and the wood veneer is perpendicular to each other. The plywood with a bamboo-wood-bamboo composite structure has high strength and combines the performance of bamboo and wood. The layers of the plywood have good fire-retardant performance and waterproof performance after being impregnated with fire-retardant and waterproof impregnating agents.

The present application relates to a kind of preparation method of antibacterial functional complex with stable structure, impregnation liquid, impregnated paper and veneer, belong to antibacterial functional material and artificial veneer technical field.The core of the present application is to prepare a kind of high-temperature-resistant antibacterial functional complex, its method is as follows: tea polyphenol, liquorice extract and citric acid are compounded, then mixed with gelatin solution, then compounded with chitosan under pH 5.0~6.0 by electrostatic interaction, finally crosslinked by glutamine transaminase catalysis, form "electrostatic-covalent" dual stable network structure.The structure effectively encapsulates natural antibacterial active ingredient, so that it can withstand the high-temperature process of impregnation drying and hot pressing, effectively avoid decomposition.The complex is added as additive in impregnated resin, antibacterial impregnated paper and veneer can be prepared.The product has efficient, long-acting, safe antibacterial function, and the preparation process is compatible with existing impregnated paper production line, easy to realize industrial production.

Embodiments of the present disclosure are directed towards a method and a system of removing deposits derived from a hydrolyzed alkenyl succinic anhydride (ASA) sizing agent from paper production equipment.

A strength agent composition for a product, wherein the product is a paper, board, molded fiber, nonwoven and / or textile product comprising cellulose or other carbohydrate-based fibers is disclosed. The strength agent composition may comprise an amphoteric polyacrylamide and a cationic starch. The cationic starch may have a degree of substitution (DS) of at least 0.12.

This oil repellent composition contains at least one of the following copolymer A and copolymer B.　Copolymer A: A copolymer which includes a unit based on a monomer represented by formula 1 and a unit based on a nonionic monomer that has a solubility of 1 g / 100 mL or more with respect to water at 20°C.　Copolymer B: A copolymer which includes a unit based on a monomer represented by formula 1 and units based on ionic monomers each having an ion-donating group, and in which the units based on ionic monomers include a unit based on a monomer having a cation-donating group and a unit based on a monomer having an anion-donating group.　In formula 1, X1 represents a monovalent polymerizable reactive group, A1 represents a divalent organic group, and B1 represents a monovalent organic group having at least one trialkylsilyl group.　Formula 1: X1-A1-B1

The present application relates to the technical field of papermaking, in particular to an inorganic fiber-metal powder paper and a preparation method and application thereof. The preparation raw material of the inorganic fiber-metal powder paper provided by the present application includes active iron powder 70-85 parts by mass, potassium perchlorate 12-20 parts by mass and inorganic fiber 2-20 parts by mass. The present application uses inorganic fiber, potassium perchlorate and active iron powder as raw materials to make inorganic fiber-metal powder paper, which improves the performance of the iron powder paper and meets the requirement of high-temperature gas production. The inorganic fiber-metal powder paper provided by the present application has the characteristics of uniform energy density, high strength, free cutting, no cracks after pressing and extremely low gas production, and can be used in missiles as a heating iron powder paper.

The application discloses a kind of low basis weight high-density fiber material preparation methods, the fiber material includes fiber layer and hot melt powder layer;The fiber layer is filled with superfine powder;Including the following steps: (1) polyvinyl alcohol ultra-short fiber, polyester superfine ultra-short fiber, fine denier ultra-short cellulose fiber are made into mixed slurry, then wet-laid web is made;(2) the wet-laid web is consolidated into intermediate material, then the intermediate material hot water bath is made, and polyvinyl alcohol ultra-short fiber is dissolved;(3) superfine powder is made into suspension, and filled into intermediate material;(4) hot melt powder is made into suspension slurry and coated and fixed.Reduce the unit area mass of material, increase the density of material under low basis weight, utilize the thermal closing pore effect of superfine powder, ensure the safety of battery separator product.Realize the technical requirement of low basis weight, high density and high porosity, solve the problem that existing fiber material cannot meet the use requirement of battery separator.

The present application relates to the technical field of starch coating, in particular to a preparation method of structured starch coating liquid with oil-proof and moisture-absorbing dual functions. The method comprises the following steps: firstly, performing mild acidolysis or selective oxidation pretreatment on cassava starch; then, preparing starch milk by using the pretreated starch, and performing synergistic enzymolysis on the starch milk under mild conditions by using a composite enzyme composed of alpha-amylase and glucoamylase in a specific ratio; after the enzymolysis, performing enzyme inactivation treatment, and then adding a bio-based crosslinking agent for compounding. The prepared coating has a specific bimodal distribution structure of starch derivative molecular weight, which is a key to realize function balance. After the coating liquid is coated on a substrate such as paper and dried and solidified, the formed coating not only has excellent oil-proof performance, but also exhibits good water vapor absorption capacity. The raw materials of the present application are green and the process is environmentally friendly, and the prepared multifunctional coating can be effectively applied to the fields of food packaging, medical protection and other fields which need to resist oil and regulate humidity at the same time.

The application discloses an antibacterial wear-resistant packaging paper and a production process thereof, and belongs to the technical field of packaging paper. The production process comprises the following steps: S1, polyvinyl alcohol is added into deionized water, and the polyvinyl alcohol is dissolved under stirring at 95 DEG C to obtain a PVA solution; after the PVA solution is cooled to room temperature through mechanical stirring, a siloxane grafted quaternary ammonium cellulose suspension, a wear-resistant component and a crosslinking agent are added; after stirring at room temperature for 1 h, an antibacterial coating solution is obtained; and S2, the antibacterial coating solution is uniformly coated on the surface of a packaging base paper, the coating thickness is 60-100 microns, and the packaging paper is dried at 90-100 DEG C for 30-60 min; after being cooled to room temperature, the antibacterial wear-resistant packaging paper is obtained. In the antibacterial coating solution, the siloxane grafted quaternary ammonium cellulose and the wear-resistant component are introduced, and various combination relationships exist between the two, so that the coating density is increased, the packaging paper is endowed with good antibacterial property, and the water resistance and wear resistance of the packaging paper are improved.

A method of improving strength properties of paper, where to strengthen paper an aqueous solution of chitosan and citric acid is used with the percentage concentration of chitosan in the solution of at least 0,1% and the percentage concentration of citric acid in the solution of at least 0,5%, where the solution is used in the paper strengthening process by adding it to the pulp in the ratio of at least ½ litre of the solution per 1 kg of dry paper according to patent PL237344, characteristic in that sodium benzoate is added to the concentrate in the amount of 0.001% to 30% as a preservative. The solution used in the strengthening process, obtained by diluting the concentrate, contains citric acid - with the concentration of at least 0,5%, chitosan with the concentration of at least 0,1% and sodium benzoate with the concentration of at least 0,001%.

This utility model provides a high-toughness double-corrugated paper core for the preservation of cultural relics, belonging to the field of corrugated paper technology; it includes: a first corrugated core, a core board disposed below the first corrugated core, a second corrugated core disposed at the bottom of the core board, reinforcing ribs fixedly disposed in the inner cavity of the first corrugated core facing the opening of the core board, a buffer layer glued to the top of the first corrugated core, and a support plate disposed in the inner cavity of the first corrugated core facing the opening of the buffer layer; this utility model achieves multi-directional compression resistance and energy absorption by setting the reinforcing ribs in a grid pattern and filling the reinforcing ribs with EPE pearl cotton buffer material, and effectively disperses external impact with the buffer layer, making it suitable for long-distance transportation of fragile cultural relics and reducing transportation damage; an insulation layer glued to the top of the buffer layer, and a fireproof layer glued to the top of the insulation layer, the fireproof layer using inorganic fire-resistant materials to improve fire resistance, and the insulation layer using polyurethane foam to prevent temperature and humidity changes from damaging the cultural relics and extend the preservation period of the cultural relics.

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 present application relates to the technical field of sleeve, and specifically discloses a sleeve for supporting the inner circle of a steel coil, which comprises a sleeve body, wherein the sleeve body is in a cylindrical structure, and an opening is arranged along the length direction of the sleeve body; and the preparation method of the sleeve body comprises the following steps: configuring an impregnation solution: firstly, dissolving copolymerization crosslinking agent and polyethylene glycol 400 in deionized water; then, adding nano microencapsulated sodium hypophosphite catalyst and free sodium hypophosphite, and stirring uniformly; finally, slowly adding paraffin microemulsion, continuing to stir until uniform and stable, and obtaining the impregnation solution after adjusting pH; sleeve impregnation, drying and solidification, and post-treatment, so that deep esterification crosslinking is realized, the physical hydrophobic layer of paraffin emulsion is matched, the ring stiffness retention rate is high after being immersed in water, the equilibrium moisture absorption rate is effectively reduced, and the risk of softening, delamination and even fragmentation of the paper sleeve due to moisture absorption is avoided.