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CN-121976424-A - Water-absorbing paper and preparation method and application thereof

CN121976424ACN 121976424 ACN121976424 ACN 121976424ACN-121976424-A

Abstract

The invention relates to a piece of absorbent paper, a preparation method and application thereof. The method comprises the steps of pulping plant fiber pulp, adding sodium bicarbonate for pretreatment, washing to obtain pretreated pulp, adding a dispersing agent, a wet strength agent and a composite antibacterial component into the pretreated pulp, uniformly mixing to obtain mixed pulp, preparing the composite antibacterial component by adopting chitosan, polylysine and modified copper oxide dispersion liquid, delivering the mixed pulp into a cylinder paper machine to produce upper-layer single-layer creping base paper, then compositing the upper-layer single-layer creping base paper with lower-layer single-layer semi-formed base paper sprayed with high-molecular water-absorbent resin particles, and drying to obtain the water-absorbent paper. The water-absorbing paper has the bacteriostasis rate of more than or equal to 99.5 percent for various pathogenic bacteria, still more than or equal to 97 percent after 20 times of water washing, high water absorption speed, stable physical property, safety, environmental protection, controllable cost, simple preparation process and suitability for industrial production, and can be widely applied to the fields of sanitary articles, medical dressings, food packages and the like.

Inventors

  • RONG YUFENG
  • ZHANG YANYAN
  • TIAN CHUNLAN
  • CUI XIANGKAI

Assignees

  • 诺宸股份有限公司

Dates

Publication Date
20260505
Application Date
20260305

Claims (10)

  1. 1. A method for preparing absorbent paper, the method comprising the steps of: (1) Pulping plant fiber pulp, adding sodium bicarbonate for pretreatment, and washing to obtain pretreated pulp; (2) Adding a dispersing agent, a wet strength agent and a composite antibacterial component into the pretreated paper pulp, and uniformly mixing to obtain mixed paper pulp, wherein the composite antibacterial component is prepared from chitosan, polylysine and modified copper oxide dispersion liquid; (3) And (3) sending the mixed paper pulp into a cylinder paper machine to form upper-layer single-layer wrinkling base paper, then compounding the upper-layer single-layer wrinkling base paper with lower-layer single-layer half-formed base paper sprayed with high-molecular water-absorbent resin particles, and drying to obtain the water-absorbent paper.
  2. 2. The method of manufacturing according to claim 1, characterized in that: the modified copper oxide dispersion liquid is polyethylene glycol coated modified copper oxide dispersion liquid; Preferably, the preparation of the polyethylene glycol coated modified copper oxide dispersion liquid comprises the steps of adding polyethylene glycol into a copper oxide aqueous dispersion liquid, stirring for 1-1.5 h at 60-70 ℃, and cooling to obtain the polyethylene glycol coated modified copper oxide dispersion liquid; Preferably, the particle size of particles in the polyethylene glycol coated modified copper oxide dispersion liquid is 20-50 nm; preferably, the molecular weight of the polyethylene glycol is 400-1000; preferably, the concentration of the copper oxide aqueous dispersion is 10-15wt%; preferably, before polyethylene glycol is added, the copper oxide aqueous dispersion is subjected to pretreatment by ultrasonic dispersion for 10-20 min or high-speed shearing for 3-5 min; preferably, the cooling is naturally cooling to 20-30 ℃; Preferably, the polyethylene glycol is used in an amount of 15 to 25% by mass of the copper oxide contained in the copper oxide aqueous dispersion.
  3. 3. The method of manufacturing according to claim 1, characterized in that: When the composite antibacterial component is prepared, the mass ratio of the chitosan to the polylysine is (3-5) 1, and/or the mass ratio of the sum of the mass dosages of the chitosan and the polylysine to the modified copper oxide contained in the modified copper oxide dispersion liquid is (5-6) 1.
  4. 4. The method of claim 1, wherein the compounding of the composite antimicrobial component comprises: preparing chitosan into a chitosan solution with the concentration of 3-5wt%; Adding polylysine into the chitosan solution, and stirring at 40-50 ℃ for 30-40 min to obtain an antibacterial auxiliary agent; mixing the antibacterial auxiliary agent and the modified copper oxide dispersion liquid, and stirring for 20-30 min to obtain a composite antibacterial component; Preferably, the deacetylation degree of the chitosan is more than or equal to 85%.
  5. 5. The method of manufacturing according to claim 1, characterized in that: The concentration of the plant fiber pulp is 5-7wt%; The plant fiber in the plant fiber pulp is formed by mixing softwood pulp and cotton linters according to the mass ratio of 3 (1.5-2.5); Pulping until the beating degree is 30-50 DEG SR; The dosage of the sodium bicarbonate is 1-1.5% of the mass of the plant fiber pulp; the pretreatment is stirring for 20-45 min at 80-90 ℃ and/or The washing is to wash with deionized water to neutrality.
  6. 6. The method of manufacturing according to claim 1, characterized in that: Before adding a dispersing agent, a wet strength agent and a composite antibacterial component into the pretreated paper pulp, adjusting the concentration of the pretreated paper pulp to 3-4wt%; The dispersant is organic dispersant, preferably one or more of polycarboxylic acid dispersant, polyethylene oxide dispersant, polyacrylamide dispersant and starch derivative dispersant, and/or The wet strength agent is a synthetic resin wet strength agent, and preferably, the synthetic resin wet strength agent is one or more of trichlorocyanamide formaldehyde resin, urea resin and polyamide epichlorohydrin resin.
  7. 7. The preparation method of claim 1, wherein the raw materials for preparing the absorbent paper comprise the following components in parts by mass: 60-80 parts of plant fiber, 0.06-0.4 part of dispersing agent, 0.3-1.6 parts of wet strength agent, 0.3-2 parts of active ingredient in the composite antibacterial ingredient and 6-30 parts of high-molecular water-absorbent resin particles.
  8. 8. The method of manufacturing according to claim 7, wherein: The composite antibacterial component comprises, by mass, 0.1-0.3 part of modified copper oxide, 0.5-0.8 part of chitosan and 0.1-0.3 part of polylysine, wherein the modified copper oxide is contained in a modified copper oxide dispersion liquid; preferably, the mass ratio of the chitosan to the polylysine is (3-5): 1.
  9. 9. Absorbent paper produced by the production method according to any one of claims 1 to 8.
  10. 10. Use of the absorbent paper produced by the production method according to any one of claims 1 to 8 as an absorbent article, characterized in that the absorbent article is one or more of a sanitary article, a medical dressing, a food packaging material.

Description

Water-absorbing paper and preparation method and application thereof Technical Field The invention belongs to the technical field of functional paper, and particularly relates to water-absorbing paper, and a preparation method and application thereof. Background The absorbent paper is widely applied in the fields of daily life (such as paper diapers and wet tissues), medical care (such as wound dressings and medical wiping paper), food preservation (such as fresh absorbent pads) and the like, and the core requirement of the absorbent paper is to quickly absorb and lock moisture. However, the traditional water-absorbing paper is extremely easy to grow harmful bacteria such as escherichia coli, staphylococcus aureus and the like in a humid environment formed after water absorption, so that the paper is peculiar smell and spoilage, and even the safety problems such as skin infection, food pollution and the like are caused. The conventional antibacterial absorbent paper has the defects that a single nano silver antibacterial agent is high in cost and easy to agglomerate, and possibly has heavy metal residue risks, a quaternary ammonium salt organic antibacterial agent (such as cetyl trimethyl ammonium bromide) is easy to run off along with water, the antibacterial durability is poor, the antibacterial rate after water washing is obviously reduced, the common copper oxide antibacterial agent is poor in dispersibility in aqueous dispersion liquid and easy to agglomerate, the antibacterial efficiency is low, the compatibility with paper pulp fibers is poor, and the tensile strength of paper is easily reduced obviously. Therefore, there is a need to provide a water-absorbing paper which is based on a novel antibacterial system, has lasting antibacterial effect, excellent water-absorbing performance, is safe and environment-friendly, and is suitable for industrial production, and a preparation method and application thereof. Disclosure of Invention In order to solve one or more technical problems in the prior art, the invention provides water-absorbing paper, and a preparation method and application thereof. The present invention provides in a first aspect a method of making absorbent paper, the method comprising the steps of: (1) Pulping plant fiber pulp, adding sodium bicarbonate for pretreatment, and washing to obtain pretreated pulp; (2) Adding a dispersing agent, a wet strength agent and a composite antibacterial component into the pretreated paper pulp, and uniformly mixing to obtain mixed paper pulp, wherein the composite antibacterial component is prepared from chitosan, polylysine and modified copper oxide dispersion liquid; (3) And (3) sending the mixed paper pulp into a cylinder paper machine to form upper-layer single-layer wrinkling base paper, then compounding the upper-layer single-layer wrinkling base paper with lower-layer single-layer half-formed base paper sprayed with high-molecular water-absorbent resin particles, and drying to obtain the water-absorbent paper. The modified copper oxide dispersion liquid is preferably polyethylene glycol coated modified copper oxide dispersion liquid, the preparation of the polyethylene glycol coated modified copper oxide dispersion liquid comprises the steps of adding polyethylene glycol into a copper oxide aqueous dispersion liquid, stirring for 1-1.5 h at 60-70 ℃, and cooling to obtain the polyethylene glycol coated modified copper oxide dispersion liquid, wherein the particle size of the polyethylene glycol coated modified copper oxide dispersion liquid is preferably 20-50 nm, the molecular weight of the polyethylene glycol is preferably 400-1000, the concentration of the copper oxide aqueous dispersion liquid is preferably 10-15 wt%, the copper oxide aqueous dispersion liquid is preferably subjected to pretreatment of ultrasonic dispersion for 10-20min or high-speed shearing for 3-5 min before polyethylene glycol is added, the cooling is preferably naturally cooled to 20-30 ℃, and the dosage of the polyethylene glycol aqueous dispersion liquid is preferably 15-25% of the mass of the copper oxide contained in the copper oxide aqueous dispersion liquid. Preferably, when the composite antibacterial component is formulated, the mass ratio of the chitosan to the polylysine is (3 to 5): 1, and/or the mass ratio of the sum of the mass amounts of the chitosan and the polylysine to the modified copper oxide contained in the modified copper oxide dispersion is (5 to 6): 1. The preparation method of the composite antibacterial component comprises the steps of preparing chitosan into a chitosan solution with the concentration of 3-5wt%, adding polylysine into the chitosan solution, stirring at 40-50 ℃ for 30-40 min to obtain an antibacterial auxiliary agent, mixing the antibacterial auxiliary agent with the modified copper oxide dispersion liquid, and stirring for 20-30 min to obtain the composite antibacterial component, wherein the deacetylation degree of the chitosa