53results about How to "Increase the degree of sizing" patented technology

The invention relates to a preparation method of paraffin wax / AKD complex type neutral paper-making sizing agent. The step is as follows: firstly, AKD and paraffin wax powder are melted in AKD solution; secondly, compound emulsifying agent after being heated is added in melted AKD solution and mixed with a quick shearing mixing machine; thirdly, a rotating speed of the quick shearing blending machine is improved and preheating water is added to lead the formed AKD solution to performing emulsification nearby a W/O to O/W inversion point; quick mixing is performed and the preheating water is added and the mixing is continuously performed; fourthly, the water solution of flocculating agent PAC is added, and the mixing is continuously performed; fifthly, the mixing is stopped and the cold water is used for quickly performing cooling and cool down, and then the finished product of the paraffin wax / AKD complex-typed neutral paper-making sizing agent emulsion is produced. The complex-typed neutral sizing agent produced by the invention has the advantages that the holding rate is high, the effect on the physical property of the paper is small, and the emulsion is stable.

The invention provides a cation surface sizing agent and preparation method thereof. Raw materials are as follows by weight percent: 8-17% of styrene, 5-15% of butyl acrylate, 0.5-5% of acrylamide, 0.5-5% of N-hydroxymethyl acrylamide, 1-5% of methyl acryloyl ethyl trimethylammonium chloride, 2-8% of starch, 0.001-0.003% of amylase, 0.2-0.7% of organic acid, 0.2-0.8% of emulsifier, 1-5% of 27% hydrogen peroxide, 0.01-0.05% of iron dichloride, the balance water. The cation surface sizing agent is prepared by starch pasting, monomer pre-emulsion and emulsion polymerization. The invention is usedfor surface sizing of paper and achieves the aim of improving physical performances of paper such as water-resistance, ring crush compression resistance, surface strength and the like.

The invention provides a nanocellulose film with adjustable hydrophilicity and hydrophobicity, and further provides a preparation method and an application of the nano cellulose film. The nanocellulose film is prepared from nanocellulose, a polymer, a sizing agent and a sizing accelerant. The nanocellulose film with adjustable hydrophilicity and hydrophobicity has the advantages of high hydrophobic contact angle, high water and oxygen blocking capacity, good stability and good printability. Infrared secondary heating and sizing agent addition are adopted, so the sizing degree of the nanocellulose film is improved. The preparation method of the film has the advantages of simplicity, easiness in implementation, convenience in operation, and short preparation period; and an industrially mature tape casting process is adopted, so the nanocellulose film with adjustable hydrophilicity and hydrophobicity can be produced on a large scale.

The invention discloses a crosslinked material capable of promoting curing of alkyl ketene dimer(AKD) and a preparation method thereof. The crosslinked material is characterized by comprising guar gum, synthetic water soluble polymer, cationic assistant, crosslinking agent and water. The preparation is implemented by the following steps: dissolving the guar gum in water, adding the crosslinking agent, stirring, regulating the pH value of the mixed reaction system by using NaOH, raising the temperature to perform a cross-linking reaction, adding the synthetic water soluble polymer and the cationic assistant, cooling to obtain the crosslinked material capable of promoting the curing of the alkyl ketene dimer. The crosslinked material of the invention can improve the degree of sizing of paper, reduces infiltration capacity of liquid, and helps to produce high water resistance. The crosslinked material of the invention reduces the sizing curing time of AKD to 2 hours from the original 2 weeks, improves the utilization rate of paper machine and reduces storage time.

The invention discloses an ML kraft paperboard and a preparation process thereof, and mainly relates to the technical field of papermaking. According to the ML kraft paperboard, basis weight is 170, 200g/m<2>, the banner quantitative difference is less than or equal to 3%, tightness is greater than or equal to 0.75 g/cm<3>, smoothness is greater than or equal to 5s, a lateral ring pressure index is greater than or equal to 7.3N.m/g, interlayer bonding strength is greater than or equal to 130J/m<2>, a bursting index is greater than or equal to 1.8kpa. M<2>/g, transverse folding strength is greater than or equal to 4 times and paper moisture is 8+/-2%. The preparation process of the ML kraft paperboard comprise the steps that preparation, pulping, mixing, paper forming and rewinding are carried out to obtain the paperboard, and then packaging is carried out; and pulp is ground during pulping, spray starch and fillers are added during paper making, and a dyeing agent is added for dyeing.The ML kraft paperboard has the advantages of low cost, high interlayer bonding, high water resistance, high smoothness and clean front appearance. The ML kraft paperboard is mainly used in a surfacelayer and an inner layer of an industrial paper tube, the ''angle-rising'' problem does not occur when the paper tube is cut in sections due to low basis weight; and the problems of surface blisteringand paper tube layering are solved due to the fact that the interlayer bonding strength of the ML kraft paperboard is higher than that of a general kraft paperboard and cardboard paper.

The invention belongs to the field of chemistry and nanometer material science, and specifically discloses a preparation method of a fluorescent ASA Pickering emulsion and application thereof. The fluorescent ASA Pickering emulsion is mainly prepared by using water, carbon quantum dots, organic modified montmorillonite and ASA as raw materials. The mass ratio of the carbon quantum dots to the organic modified montmorillonite is 1: (2-4); and the mass ratio of the organic modified montmorillonite to the ASA is (2-4): 100. By using the carbon quantum dot/organic modified montmorillonite stabilization system for preparation of ASA Pickering, the adverse effects of a surfactant on water and soil can be avoided, and eco-environmental stress can be reduced. The ASA Pickering emulsion prepared bythe emulsion stabilization system has fluorescence property. By the use of the emulsion for internal sizing of paper sheet, the degree of paper sizing can be remarkably enhanced, and the internal sizing effect of the ASA Pickering emulsion is better.

The invention discloses an AKD neutral sizing agent prepared by a cationic emulsifier and a preparation method and application of the AKD neutral sizing agent and relates to the field of papermaking chemicals. The method includes: mixing the solid cationic emulsifier with AKD according a certain proportion under room temperature, and melting at 80-85 DEG C; slowly adding hot water into the melt AKD/emulsifier mixture, performing shearing stirring at the speed of 1000-2000r/minute for 2-5 minutes; increasing the shearing stirring speed to 10000r/minute, and stirring at high speed for 25-30 minutes, stopping stirring, using cold water for fast cooling to obtain the sizing agent emulsion. The AKD sizing agent prepared by the method is good in water resistance, free of a curing period, good in emulsion stability, antibacterial, and the like.

The invention relates to a paraffin sizing agent and a preparation method thereof. The paraffin sizing agent is prepared from the following components in parts by weight: 15-18 parts of paraffin, 4-7 parts of methyl glucose dioleate, 5-6 parts of diethylene glycol monolaurate, 3-4 parts of sodium alga acid, 2-4 parts of polyvinyl alcohol, 4-5 parts of oxidized starch and 130-134 parts of deionized water. The components of the paraffin sizing agent disclosed by the invention are dissolved, agitated and sheared to prepare the paraffin sizing agent. The prepared paraffin sizing agent has a high sizing degree, and the surface strength of paper can be improved.

The invention discloses myopia prevention paper. The myopia prevention paper is prepared from pulp and pigment, wherein the pulp is prepared from the following raw materials in percentage by weight: 75 to 85 percent of waste book paper deinked pulp and 15 to 25 percent of white shavings pulp; the pigment is selected from one or more of chrysophenine G, auramine O and malachite green. The myopia prevention paper is faint yellow or faint green, and is soft in luster, so that the myopia prevention paper has low irritation to human eyes, can relieve visual fatigue, plays a certain role in protecting eyes, and plays a role in preventing myopia. Meanwhile, waste book paper and white shavings are taken as main raw materials of the myopia prevention paper, so that secondary fiber is utility fully,other additives except pigment do not need to be added, the production cost can be lowered remarkably, and the influence on the environment is lowered. Moreover, the myopia prevention paper has the advantages of high tensile index, tearing strength index, smoothness and sizing value, low surface absorption amount, and high mechanical performance, surface performance and water resistance, and is smooth for a user to write.

The invention relates to a preparation method for a negative ion organosilicon modified polyacrylate paper reinforcing agent. A transparent negative ion organosilicon modified polyacrylate emulsion is obtained by solution polymerization, by using methylacrylic acid, functional vinyl monomers, lipophilic monomers and gamma-methacryloxy propyl trimethoxyl silane as comonomers and isopropanol as a solvent and a chain transfer agent to carry out free radical polymerization of acrylic monomers, and through the steps of cooling, triethylamine neutralization and water dispersion. The obtained negative ion organosilicon modified polyacrylate paper reinforcing agent can not only effectively increase paper surface strength and folding endurance but also increase waterproof property of the paper surface. Besides, due to the addition of gamma-methacryloxy propyl trimethoxyl silane, adhesion properties between fibers and inorganic fillers are increased; and defects of ash and fiber falling during a printing process of the paper. Meanwhile, the product is simple in preparation process, low in raw material cost and simple in glue-applying process and can be easily applied and popularized in real industries.

The invention discloses a preparation method of a rapidly-cured water-resistant AKD sizing agent, and belongs to the technical field of sizing agent preparation. The method includes the steps that firstly, guar gum is modified with cationic monomers; then, the modified guar gum and vegetable oil are blended, modification is carried out under the action of microorganisms, and a self-made synergist is obtained; finally, the synergist and other materials are compounded, and the rapidly-cured water-resistant AKD sizing agent is obtained. According to the preparation method, the characteristic that guar gum and cellulose have similar structures is utilized, the guar gum contains rich hydroxyl groups and has high affinity with fibers, and meanwhile the hydroxyl groups and fiber surface groups can form chemical bonding; besides, after modification with vegetable oil, the number of hydrophobic ester groups is increased, hydrolysis caused by contact with water can be avoided, reaction between the sizing agent and fibers is accelerated, the AKD sizing effect is improved, the problems that a common AKD sizing agent is long in curing time and delayed in sizing effect, and AKD is poor in stability in water and likely to be hydrolyzed and fail are effectively solved, and the AKD sizing agent has an excellent sizing effect.

The invention discloses a radiation-modified cellulose emulsifier which is obtained by reacting epoxy chloropropane, triethylamine, radiation-modified cellulose, methanol and water, with the radiation-modified cellulose being formed by inducing grafting of styrene to the surface of cellulose by adopting a radiation method and then performing acetylation and amination. The invention also disclosesan AKD emulsion, which comprises AKD wax and an effective amount of the radiation-modified cellulose emulsifier. The radiation-modified cellulose emulsifier is successfully prepared through a series of cellulose modification, then the novel AKD emulsion with excellent performance is obtained, and the AKD emulsion has the advantages of being high in curing rate and high in sizing degree and has wide application value in the field of papermaking.

The invention discloses a cationic rosin emulsion neutral-alkaline sizing agent. The cationic rosin emulsion neutral-alkaline sizing agent is prepared from an emulsifier, polymerized rosin and an auxiliary material, the emulsifier is prepared from methacrylic acid, diluted sulfuric acid, ammonium acrylate, styrene, isopropanol, dodecanethiol, acrylic acid and ammonium persulfate, the polymerized rosin is prepared from rosin, a naphtha solvent, 98% sulfuric acid, anhydrous zinc sulfate and 50 DEG C deionized water, and the auxiliary materials includes lignin, sodium hydroxide and glycerin. Thecationic rosin emulsion neutral-alkaline sizing agent can improve the gloss of paper, and allows a sized surface to have a good strength and remarkably improved dry-wet strength, paper produced by using the cationic rosin emulsion neutral-alkaline sizing agent can be easily recovered and treated, and aluminum sulfate is not added in the preparation process to obtain the alkaline sizing agent handle.

The invention relates to a preparation method of a corn starch surface sizing agent. The method includes the steps of adopting corn starch as a raw material, adopting sodium hypochlorite (NaClO) as anoxidant, and adopting nanometer microcrystalline cellulose as an auxiliary oxidant for preparing oxidized corn starch, wherein the available chlorine dosage of NaClO relative to absolutely dried cornstarch is 8.0-9.0 wt%, and the dosage of the nanometer microcrystalline cellulose relative to the absolutely dried corn starch is 0.5-0.8 wt%; combining the prepared oxidized corn starch with polyvinyl alcohol and glycerol to prepare the corn starch surface sizing agent. Sodium hypochlorite oxidized starch prepared by catalysis of nanometer cellulose in specific length can be used for preparing asurface sizing agent which is low in viscosity, high in glue stability, high in transparency and great in film-forming property.

The invention discloses a production process of efficient kinking folding type candy packaging base paper. The production process comprises the following procedures that bleached sulphate softwood pulp is pulped by a pulping process; then the pulp is formed by the fourdrinier multi-cylinder paper machine; and the pulp is squeezed, dried, calendered, cut, packaged and warehoused, wherein the pulping process adopts a plurality of Type 3 and Type 4 double-disc mills for mixing and pulping, and the adopted pulping mode is a high-concentration sticky pulping mode, so that the content of long fibersof the pulp can be kept to the maximum extent, and the tensile strength and the tearing strength of paper are favorably improved; and chemical auxiliary agents are added into the the pulp in the pulping process, so that compared with the traditional process, the addition of the chemical auxiliary agents saves the using amount of the auxiliary agents, has strong economic applicability, and simultaneously improves dry strength indexes such as breaking length, bursting strength, folding strength and the like and the sizing degree of paper.

The invention discloses a method for preparing carboxyl-type amphoteric starch in one step by a semi-dry process, which is characterized in that: firstly adding a cationic reagent 3-chloro-2-hydroxypropyl-trimethylammonium chloride to carry out etherification reaction on the original starch, After the etherification reaction, directly add the anionizing reagent monochloroacetic acid to carry out the carboxymethylation reaction. Both anionization and cationization reactions are carried out in one kettle to prepare carboxy-type amphoteric starch in one step, and the production process is uninterrupted. The invention can effectively solve the shortcomings of wet process and dry process. Cationic and anionic groups are connected in the same starch chain, so that the product has the characteristics of cationic starch and anionic starch, and various performances are improved; the reaction time can be shortened from 8 hours to 6 hours; due to the shortened process, energy saving and consumption reduction, so that The product cost can be saved by about 12%.