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CN-119265975-B - Paper product, paper pulp and preparation method thereof

CN119265975BCN 119265975 BCN119265975 BCN 119265975BCN-119265975-B

Abstract

The application provides paper products, paper pulp and a preparation method thereof, wherein the preparation method of the paper pulp comprises the steps of spraying a cationic dry strength agent on the surface of semi-dry pulp of alkaline hydrogen peroxide mechanical pulp, adding polyaluminium chloride into dispersing water, mixing the alkaline hydrogen peroxide mechanical pulp semi-dry pulp with the surface sprayed with the cationic dry strength agent and the dispersing water added with the polyaluminium chloride to carry out dispersing, grinding the pulp after dispersing, and adding an amphoteric dry strength agent into the pulp after grinding. According to the preparation method of the paper pulp, provided by the embodiment of the application, in the process of dispersing the APMP (alkaline hydrogen peroxide mechanical pulp) semi-dry pulp into the pulp, the comprehensive strength of the APMP is improved through a series of pretreatment including fiber charge modification, coating enhancement and other treatment means, so that the proportion of the APMP pulp in paper is improved or the ash content of the paper is improved, and the purposes of reducing the consumption of chemical pulp fibers and saving the cost are achieved.

Inventors

  • ZHU YEFENG
  • YU WANGSHENG
  • LU HAI
  • LIU ZHIJUN
  • DING NING

Assignees

  • 金东纸业（江苏）股份有限公司

Dates

Publication Date
20260508
Application Date
20240822

Claims (7)

  1. 1. A method of making pulp, the method comprising: Spraying a cationic dry strength agent on the surface of the semi-dry pulp of alkaline hydrogen peroxide mechanical pulp with the dryness of 30%, wherein the cationic dry strength agent is a positive polyacrylamide polymer, and the molecular weight of the positive polyacrylamide polymer is 600-1200 ten thousand; adding polyaluminium chloride into the slurry; Mixing semi-dry slurry of alkaline hydrogen peroxide mechanical slurry sprayed with a cationic dry strength agent on the surface with slurry dispersing water added with polyaluminium chloride to carry out slurry dispersing; pulping the pulp after the pulp dispersion; adding an amphoteric dry strength agent into the pulp after pulping, wherein the amphoteric dry strength agent is amphoteric polyacrylamide, and the molecular weight of the amphoteric polyacrylamide is 600-1200 ten thousand; The addition amount of the cationic dry strength agent is 3-20 kg/ton pulp.
  2. 2. The method of claim 1, wherein the cationic dry strength agent is present at a concentration of 0.1-1.0%.
  3. 3. The method according to claim 1, wherein in the step of adding polyaluminum chloride to the bulk slurry, the amount of polyaluminum chloride is 1000 to 20000ppm relative to the absolute dry amount of the alkaline hydrogen peroxide mechanical pulp.
  4. 4. A method of preparation according to claim 3, characterised in that the aluminium polychloride is used in an amount of 2000-3000ppm relative to the absolute dry amount of the alkaline hydrogen peroxide mechanical pulp.
  5. 5. The method according to claim 1, wherein the amphoteric polyacrylamide is used in an amount of 10 to 60 kg/ton of slurry.
  6. 6. Pulp, characterized in that it is obtained by the preparation method according to any one of claims 1-5.
  7. 7. A paper product, characterized in that it is obtained by the pulp preparation according to claim 6.

Description

Paper product, paper pulp and preparation method thereof Technical Field The application relates to the technical field of papermaking, in particular to paper products, paper pulp and a preparation method thereof. Background With the increasing severity of global climate change and environmental problems, governments are strengthening environmental regulations and carbon emissions control. In such a context, achieving carbon peaks and carbon neutralization is a global consensus and goal. The carbon reaching peak means that the emission amount of carbon dioxide in a country or region does not increase after reaching the peak value within a certain period of time, and the carbon neutralization is realized by counteracting the emitted carbon dioxide through various measures, so that the net emission is zero. Under such large circumstances, the use of high-yield pulp as a raw material for the production of paper and other cellulose-based products in the papermaking industry is becoming increasingly a major trend in the industry. The high-yield pulp is a process for extracting cellulose fibers from wood by purely mechanical or chemimechanical methods, and has higher fiber extraction rate, lower energy consumption and less use of chemical additives than conventional chemical or mechanical pulp, thereby reducing carbon emissions and environmental pollution during production. The use of high yield pulp has several advantages in terms of environmental protection and carbon peaks 1. High fiber extraction rate high yield pulp has a higher fiber extraction rate than conventional processes, which means that more paper or other cellulosic products can be produced from the same amount of wood, reducing the need for raw materials. 2. And the energy consumption in the production process of the high-yield slurry is lower than that in the traditional chemical slurry, so that the energy consumption and carbon emission in the whole production process can be reduced. 3. The chemical additives are reduced, the chemical additives used in the production process of the high-yield pulp are fewer, the chemical pollution to the environment is reduced, and the cost and difficulty for treating the wastewater are reduced. 4. Recycling economy, namely, byproducts such as lignin generated in the production process of the high-yield pulp can be recycled and used for producing biofuel, chemical raw materials and the like, thereby promoting the development of recycling economy. 5. The policy supports that the country brings out a series of policies and motivation measures for promoting environmental protection and realizing the peak goal of carbon, and supports the research and the development and the application of environmental protection production processes such as high-yield pulp and the like. 6. Market demand as consumer awareness of environmental protection and sustainable development increases, market demand for environmental paper and cellulosic products continues to grow, and this market demand can be met with high yield pulp. The cost is reduced, and the ton pulp using cost of the high-yield pulp is far lower than that of the chemical pulp, so that under the strong market competition environment, a papermaking enterprise can balance the production cost through the use of the high-yield pulp, and the strong market competition is dealt with, and the profitability of the enterprise is maintained. Although the use of mechanical pulp has many benefits for environmental protection and control of enterprise costs, the low physical strength and low whiteness of mechanical pulp such as APMP is a problem that limits its application to paper. Disclosure of Invention According to a first aspect of the embodiment of the application, there is provided a method for preparing pulp, the method comprising: spraying a cationic dry strength agent on the surface of the semi-dry slurry of the alkaline hydrogen peroxide mechanical slurry; adding polyaluminium chloride into the slurry; Mixing alkaline hydrogen peroxide mechanical pulp semi-dry pulp with a cationic dry strength agent sprayed on the surface with dispersing pulp water added with polyaluminium chloride to carry out dispersing pulp; pulping the pulp after the pulp dispersion; an amphoteric dry strength agent is added to the pulp after refining. In some embodiments, the cationic dry strength agent is a positive polyacrylamide polymer having a molecular weight of 600-1200 ten thousand. In some embodiments, the cationic dry strength agent is at a concentration of 0.1-1.0%. In some embodiments, the cationic dry strength agent is added in an amount of 3-20kg per ton of pulp. In some embodiments, in the step of adding polyaluminum chloride to the dispersion water, the polyaluminum chloride is used in an amount of 1000 to 20000ppm relative to the absolute dry amount of the alkaline hydrogen peroxide mechanical pulp. In some embodiments, the polyaluminum chloride is used in an amount of 2000 to 3000ppm