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CN-118910922-B - Preparation method of aerogel papermaking auxiliary agent based on composite fiber material

CN118910922BCN 118910922 BCN118910922 BCN 118910922BCN-118910922-B

Abstract

The invention relates to the technical field of papermaking processing, in particular to a preparation method of an aerogel papermaking auxiliary agent based on a composite fiber material, which comprises the steps of S1, diluting an auxiliary agent intermediate by adding water, regulating the pH value to 9.0-9.5, stirring and mixing for 12-18min, controlling the temperature to be 32-36 ℃ to obtain an auxiliary agent intermediate solution, S2, adding glyoxal into the auxiliary agent intermediate solution under stirring to regulate the pH value to 9.0-9.3, reacting until the material viscosity reaches 20-50cps, stopping reacting when the pH value is regulated to 2.5-4.0, adding the aerogel composite fiber material after the reaction is finished, and fully stirring and dispersing to obtain the papermaking auxiliary agent. The papermaking auxiliary agent prepared by the method is introduced into a papermaking process, so that the tensile strength and ring crush strength of paper can be effectively improved, the paper has excellent strength and toughness, and the requirements of special industries can be better met.

Inventors

  • QIU ZHENQUAN

Assignees

  • 苏州赛维科环保技术服务有限公司

Dates

Publication Date
20260512
Application Date
20240828

Claims (6)

  1. 1. The preparation method of the aerogel papermaking auxiliary agent based on the composite fiber material is characterized by comprising the following steps of: S1, diluting the auxiliary agent intermediate with water, regulating the pH value to 9.0-9.5, stirring and mixing for 12-18min, and controlling the temperature at 32-36 ℃ to obtain an auxiliary agent intermediate solution; S2, adding glyoxal into the auxiliary agent intermediate solution by means of a circulating pump under stirring, controlling the absolute dry mass ratio of the auxiliary agent intermediate to glyoxal to be (3.2-7.6), 1, adjusting the pH value to 9.0-9.3, reacting until the viscosity of the material reaches 20-50cps, stopping reacting when the pH value is adjusted to 2.5-4.0, adding the aerogel composite fiber material after the reaction is finished, and fully stirring and dispersing to obtain the papermaking auxiliary agent; The preparation method of the aerogel composite fiber material comprises the following steps: 1) Dispersing the composite fiber material in deionized water to obtain a dispersion liquid, adding the composite aerogel into the dispersion liquid, vacuumizing to 50-100Pa, maintaining for 30-50min under the ultrasonic action of 200-300r/min and 200-300W, and centrifuging the product after the treatment is finished to obtain a pretreated composite fiber material; 2) Dissolving antimony potassium tartrate in deionized water, magnetically stirring for 15-30min, adding polyvinylpyrrolidone, continuously stirring for 15-30min, adding thioacetamide into the formed mixed solution, and fully and uniformly stirring to obtain a reaction solution; 3) Respectively ultrasonically cleaning the pretreated composite fiber material by using acetone, distilled water and ethanol for 10-20min, drying, adding the pretreated composite fiber material into a reaction solution, ultrasonically treating for 10-20min, transferring the pretreated composite fiber material into a reaction kettle, sealing, placing the pretreated composite fiber material into a baking oven, heating the pretreated composite fiber material at a constant temperature of 180-186 ℃ for 24-26h, cooling the pretreated composite fiber material to room temperature after the reaction is finished, centrifuging the product, repeatedly cleaning the product by using deionized water, and drying the product; The preparation method of the auxiliary agent intermediate comprises the following steps: Adding 30-42 parts of acrylamide monomer, 4-7 parts of anionic monomer, 28-42 parts of cationic monomer, 1-3 parts of chain transfer agent and 0.02-0.05 part of complexing agent into a reaction kettle, adding soft water to prepare an aqueous solution with the mass percent concentration of 20-28%, introducing nitrogen for 25-50min, adding 2-6 parts of pH regulator to regulate the pH value to 4.0-5.5, uniformly dropwise adding 3-5 parts of catalyst and 1-3 parts of initiator at 68-72 ℃, stirring for reacting for 120-170min, keeping the temperature for 50-100min, stopping reacting, cooling to room temperature, and adding 0.1-0.5 part of antibacterial agent to obtain an auxiliary agent intermediate; the preparation method of the composite aerogel comprises the following steps: 1) Mixing sodium alginate, kappa-type carrageenan and chitosan with the mass ratio of (3-4) 1 (2-3) to obtain a precursor, preparing a precursor aqueous solution, taking ethanol as a coagulating bath, separating out by wet spinning, coagulating and forming separated gel in a copper nitrate solution with the mass fraction of 5-8%, drying, placing in a muffle furnace, carbonizing for 2-3h at 800-830 ℃, soaking the obtained product in acetic acid, and repeatedly cleaning and drying with deionized water to obtain carbon aerogel; 2) Dissolving L-aspartic acid in a sodium hydroxide solution with the concentration of 6.0-6.8mol/L, adding carbon aerogel, carrying out ultrasonic treatment for 30-50min, dispersing uniformly, adding a copper nitrate solution with the concentration of 0.5-0.8mol/L, stirring for reaction for 3-5h, centrifugally separating the obtained product, repeatedly washing with deionized water, acetic acid solution and ethanol solution in sequence, and drying to obtain composite aerogel; the preparation method of the composite fiber material comprises the following steps: 1) Putting 0.2-0.5g of nano magnesium oxide into 100-160mL of methanol solution, performing ultrasonic dispersion for 30-50min, then adding 1.2-1.8g of zinc nitrate, stirring for 1-2h to obtain solution A, uniformly dispersing 1.4-2.0g of 2-methylimidazole into 300-500mL of methanol solution to obtain solution B, mixing the solution A and the solution B, performing stirring reaction for 24-30h at normal temperature, centrifuging the obtained product, repeatedly washing with methanol, and drying to obtain a framework template material; 2) Putting pre-crushed asphalt, potassium bicarbonate and framework template materials into a mortar for uniform mixing, then putting into a tube furnace, heating to 300-320 ℃, performing constant temperature treatment for 30-50min, then heating to 900-950 ℃ at the same speed, performing constant temperature treatment for 1-2h, naturally cooling to room temperature, stirring and soaking the obtained product in hydrochloric acid solution for 24-30h, and performing suction filtration, washing, drying and grinding to obtain porous carbon nano sheets; 3) Adding copper nitrate, potassium permanganate and manganese sulfate into deionized water, magnetically stirring for 30-50min to form a uniform solution, adding porous carbon nano sheets, uniformly dispersing, sealing in a reactor, reacting at a constant temperature of 160-165 ℃ for 12-15h under the action of ultrasound, naturally cooling to room temperature after the reaction is finished, repeatedly washing the product obtained after centrifugation with water and ethanol, and drying to obtain a composite nano material; 4) Adding the carbon fiber and the composite nano material into a container, adding deionized water, mechanically stirring for 1-2h, performing ultrasonic treatment for 1-2h, performing suction filtration on the product after the treatment is finished, and drying to obtain the composite fiber material.
  2. 2. The preparation method of the aerogel papermaking auxiliary agent based on the composite fiber material, as claimed in claim 1, is characterized in that in the preparation method of the auxiliary agent intermediate, the cationic monomer consists of dimethyl diallyl ammonium chloride monomer and acryloyloxyethyl trimethyl ammonium chloride monomer with equal mass; the anionic monomer is selected from one or more of itaconic acid, 2-acrylamide-2-methylpropanesulfonic acid and salts thereof; The initiator is one or more selected from ammonium persulfate, sodium persulfate, potassium persulfate, azo diisobutylamidine hydrochloride and azo diisopropyl imidazoline hydrochloride; the pH value regulator comprises alkali and acid, wherein the alkali is selected from one or more of sodium hydroxide and ammonia water, and the acid is selected from one or more of hydrochloric acid, phosphoric acid, formic acid and citric acid; The chain transfer agent is sodium formate, the catalyst is phosphoric acid, the complexing agent is disodium ethylenediamine tetraacetate, and the antibacterial agent is isothiazolinone.
  3. 3. The method for preparing aerogel papermaking auxiliary agent based on composite fiber material according to claim 1, wherein in the preparation method of composite aerogel, the mass fraction of the precursor aqueous solution is 3-5%; The ratio of the L-aspartic acid to the sodium hydroxide solution to the carbon aerogel to the copper nitrate solution is (0.04-0.07) mol (10-20) mL (0.3-0.5) g (100-130) mL.
  4. 4. The method for preparing aerogel papermaking auxiliary agent based on composite fiber material according to claim 1, wherein in the preparation method of composite fiber material, the rotation speed of stirring reaction is 500-600r/min; The mass ratio of the asphalt to the potassium bicarbonate to the framework template material is (1.0-1.8) (3.0-5.4) (1.0-1.8); the temperature rising rate is 5-8 ℃ per minute; The concentration of the hydrochloric acid solution is 0.1-0.3mol/L.
  5. 5. The preparation method of the aerogel papermaking auxiliary agent based on the composite fiber material, according to claim 1, wherein in the preparation method of the composite fiber material, the proportion of the copper nitrate, the potassium permanganate, the manganese sulfate, the deionized water and the porous carbon nano sheet is (0.025-0.030) mol, (0.14-0.18) mol, (0.045-0.052) mol, (70-100) mL, (5-8) g; The power of the ultrasonic action is 100-150W; The ratio of the carbon fiber to the composite nano material to the deionized water is (10-20) g (3-7) g (200-300) mL; the rotating speed of the mechanical stirring is 800-1200r/min; The power of the ultrasonic treatment is 500-600W.
  6. 6. The method for preparing an aerogel-type papermaking auxiliary agent based on a composite fiber material according to claim 1, wherein in the preparation method of the aerogel-type composite fiber material, the solid content of the dispersion liquid is 5-8wt%; the solid-liquid ratio of the composite aerogel and the dispersion liquid is 1 (150-260) g/mL; the proportion of the potassium antimony tartrate, the deionized water, the polyvinylpyrrolidone and the thioacetamide is (0.6-1.4) mol, (60-130) mL, (0.3-0.6) g, (1.3-2.1) mol; the ratio of the pretreated composite fiber material to the reaction solution is (5-12) g (160-280) mL.

Description

Preparation method of aerogel papermaking auxiliary agent based on composite fiber material Technical Field The invention relates to the technical field of papermaking processing, in particular to a preparation method of an aerogel papermaking auxiliary agent based on a composite fiber material. Background The dry strength of paper is one of the structural properties of paper. The dry strength of paper is mainly obtained as the network of fibers is formed and bonds between the fibers after drying. In fact, the strength of paper is primarily dependent on the strength of the individual fibers and the degree of bonding between the fibers, the number, the distribution of fiber bonding, and the like. The strength of the fiber network can be increased by mechanical beating and refining because after increasing the freeness, the number of micro fibers is increased, thereby increasing the formation of bonds between fibers. In the bonding forces between fibers, hydrogen bonds are critical in spite of covalent bonds, ionic bonds and van der Waals forces. Unlike other bonds, hydrogen bonds can only form within a very short distance and must interact when the molecules are in close proximity. For example, chinese patent CN103866629A discloses a papermaking processing aid and a preparation method thereof, wherein the papermaking processing aid comprises, by weight, 13-15 parts of toluene diisocyanate, 2-4 parts of C9 petroleum resin, 9-12 parts of potassium octadecyl benzene sulfonate, 1-2 parts of potassium oxalate, 4-5 parts of propylene glycol, 4-6 parts of ethyl acetate and 120-124 parts of deionized water, and the papermaking processing aid realizes the improvement of paper strength by increasing the bonding effect among paper fibers, but the formation of bonds among the paper fibers is influenced by various factors such as reaction dimension, pH and the like, the bonding rate is lower, and the formed chemical bonds are interacted only when molecules are in close contact, so that the improvement degree of the paper strength is poor, the paper strength can only meet daily use, and cannot meet the requirements for special industries with higher paper strength requirements. Disclosure of Invention Aiming at the problems in the prior art, the invention aims to provide a preparation method of an aerogel papermaking auxiliary agent based on a composite fiber material. In order to achieve the above purpose, the present invention provides the following technical solutions: the preparation method of the aerogel papermaking auxiliary agent based on the composite fiber material comprises the following steps: S1, diluting the auxiliary agent intermediate with water, regulating the pH value to 9.0-9.5, stirring and mixing for 12-18min, and controlling the temperature at 32-36 ℃ to obtain an auxiliary agent intermediate solution; s2, adding glyoxal into the auxiliary agent intermediate solution by means of a circulating pump under stirring, controlling the absolute dry mass ratio of the auxiliary agent intermediate to glyoxal to be (3.2-7.6) 1, regulating the pH value to 9.0-9.3, stopping the reaction until the material viscosity reaches 20-50cps, regulating the pH value to 2.5-4.0, adding the aerogel composite fiber material after the reaction is finished, and fully stirring and dispersing to obtain the papermaking auxiliary agent; the preparation method of the aerogel composite fiber material comprises the following steps: 1) Preparing a precursor by using a sodium alginate/carrageenan/chitosan mixture as a precursor through a wet spinning technology, and preparing a composite aerogel by using aspartic acid as an organic ligand and copper as a metal center through a coprecipitation mode; 2) Synthesizing a porous nano sheet by a hydrothermal method, taking the porous nano sheet as a base material, depositing and forming a nanowire on the surface of the base material to obtain a nano material, and combining the nano material with carbon fibers in a physical combination mode to obtain a composite fiber material; 3) And (3) fully mixing the composite fiber material and the composite aerogel through vacuum treatment under ultrasonic and mechanical stirring, and then placing the mixture into a reaction liquid formed by a sulfur source and an antimony source for hydrothermal reaction to obtain the aerogel composite fiber material. As a further preferable scheme of the invention, the preparation method of the auxiliary agent intermediate comprises the following steps: According to parts by weight, adding 30-42 parts of acrylamide monomer, 4-7 parts of anionic monomer, 28-42 parts of cationic monomer, 1-3 parts of chain transfer agent and 0.02-0.05 part of complexing agent into a reaction kettle, adding soft water to prepare an aqueous solution with the mass percent concentration of 20-28%, introducing nitrogen for 25-50min, adding 2-6 parts of pH regulator to regulate the pH value to 4.0-5.5, uniformly dropwise adding 3-5 parts of cat