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CN-122013595-A - High-strength high-air permeability germinated seed paper and preparation method thereof

CN122013595ACN 122013595 ACN122013595 ACN 122013595ACN-122013595-A

Abstract

The invention discloses high-strength high-air permeability germinated seed paper and a preparation method thereof, and belongs to the technical field of seed paper preparation. Aims at solving the technical problem that the water absorption and air permeability of the traditional seed paper are reduced due to the addition of the chemical reinforcing agent, thereby influencing the germination rate of seeds. The technical scheme is that unbleached softwood pulp is used as a raw material, pulp is made by mixing the unbleached softwood pulp with cationic lignocellulose nanofibrils and seeds accounting for 4-8% of the mass of absolute dry pulp through PFI grinding, the pulp is formed through an automatic paper making system by a Kaiser method, the pulp is dried and formed at 40 ℃, and the cationic lignocellulose nanofibrils are prepared through unbleached softwood pulp grinding, alkali treatment, etherification reaction and ultrahigh pressure homogenization. The seed paper does not need chemical reinforcing agents, and has air permeability of 17.4-18.8 mu m/(Pa.S), tensile strength of 6.08-6.84 kN/m and relative absorptivity of 214-230%.

Inventors

  • ZHANG XIAOLONG
  • YAO ZHIWEI
  • Ju Hongyi
  • JIN LANG

Assignees

  • 浙江晶鑫特种纸业有限公司

Dates

Publication Date
20260512
Application Date
20260309

Claims (7)

  1. 1. The high-strength high-air permeability germinated seed paper is characterized by comprising a paper pulp substrate and seeds uniformly dispersed in the paper pulp substrate, wherein the paper pulp substrate is prepared by mixing unbleached softwood pulp and cationic lignocellulose nanofibrils, the cationic lignocellulose nanofibrils account for 4-8% of the mass of absolute dry pulp, and the quantification of the seed paper is 110g/m 2 .
  2. 2. The preparation method of the high-strength high-air-permeability germinated seed paper is characterized by comprising the following steps of: s1, pulping unbleached softwood pulp by adopting a PFI mill, controlling the pulping concentration to be 10% and the pulping degree to be 50-70 DEG SR; s2, slurry preparation, namely mixing the cationic lignocellulose nanofibrils with the paper pulp treated in the step S1, then scattering seeds, and stirring the mixture at 3000-5000 r of revolution by adopting a fluffer to uniformly mix the paper pulp, the cationic lignocellulose nanofibrils and the seeds; s3, papermaking molding, namely adopting a Kaiser method automatic papermaking system to perform papermaking on the slurry obtained in the step S2, and removing most of water through vacuumizing to mold the paper; S4, drying and preserving, namely placing the paper formed in the step 3 into a dehumidifying and heating room at 40 ℃ for drying and shaping, and collecting and preserving after drying; wherein, the cationic lignocellulose nanofibrils described in step S2 are prepared by the following method: a. Pulping, namely pulping unbleached softwood pulp by adopting PFI (pulse frequency reactor) grinding, wherein the pulping concentration is 10%, and the pulping degree is 90 DEG SR after pulping; b. Alkali treatment, namely taking 1g of absolute dry pulp, adding 100ml of NaOH solution with mass concentration of 5%, and stirring for 1-2 hours at room temperature at 300-500 rpm; c. The etherification reaction is carried out, namely 2, 3-epoxypropyl trimethyl ammonium chloride dissolved in isopropanol is added into the system in the step b, the mass ratio of the 2, 3-epoxypropyl trimethyl ammonium chloride to absolute dry pulp is 3-7 g/g, and the mixture is placed in a constant-temperature water bath kettle for stirring reaction for 2-4 hours at the temperature of 30-70 ℃; d. c, stopping and washing, namely adding 5-7 g of glacial acetic acid into the reaction system in the step c to stop the reaction, and repeatedly washing the slurry with deionized water until the pH value of the washing wastewater is=7; e. and d, ultra-high pressure homogenization, namely diluting the slurry washed in the step d with deionized water, adding the diluted slurry into an ultra-high pressure nano material preparation disperser, regulating the pressure to 25MPa, circularly homogenizing for 15 times, standing for 6-10 h, and collecting the lower fiber suspension for later use.
  3. 3. The method of producing a high strength and high air permeability germinated seed paper according to claim 2, wherein the mass ratio of 2, 3-epoxypropyltrimethylammonium chloride to absolute dry pulp in step c is 5g/g.
  4. 4. The method of producing a high strength, high air permeability, germinated seed paper according to claim 2, wherein the reaction temperature in step C is 40℃and the reaction time is 3 hours.
  5. 5. The method of producing a high strength, high air permeability, germinated seed paper according to claim 2, wherein the freeness in step S1 is 50 SR or 70 SR.
  6. 6. The method for preparing high-strength high-air-permeability germinated seed paper according to claim 2, wherein the stirring speed in the step b is 300-500 rpm, and the stirring time is 1-2 h.
  7. 7. The method of producing a high strength, high air permeability, germinated seed paper according to claim 2, wherein the glacial acetic acid is added in an amount of 7g in step d.

Description

High-strength high-air permeability germinated seed paper and preparation method thereof Technical Field The invention relates to the technical field of seed paper preparation, in particular to high-strength high-air permeability germinated seed paper and a preparation method thereof. Background The seed paper is a germinated paper product prepared by doping seeds into paper pulp through a paper making technology, and the core is applied to a plant seed seedling raising process, so that a stable growth environment can be provided for the seeds, and the germination, growth and survival of the seeds are promoted, so that the seed paper is a key auxiliary material in modern agricultural production. In addition, the seed paper can be combined with paper products such as tickets, labels, tags and the like, so that the functions of the product are expanded, and the utilization value of the product is improved. The germination of seeds needs to meet specific conditions of humidity and air permeability, and if the seed paper has poor water absorption and air permeability, the germination rate of the seeds can be directly reduced. In the prior art, in order to enhance the physical strength of seed paper, a chemical reinforcing agent is usually added into paper pulp, but the chemical reinforcing agent can obviously reduce the water absorption and air permeability of paper, so as to form the contradiction of strength improvement and germination condition guarantee. Therefore, the development of the germinated seed paper which does not need to add papermaking chemicals and has high strength, high water absorbability and high air permeability has important significance for promoting the technical upgrading of the seed paper and agricultural application. Disclosure of Invention The invention aims at providing the high-strength high-air permeability germinated seed paper, solving the problems of poor water absorption and air permeability and low seed germination rate caused by adding a chemical reinforcing agent into the traditional seed paper, and the other aim of the invention is to provide the preparation method of the seed paper, so that the environment-friendly and efficient large-scale production is realized. The technical scheme includes that the high-strength high-air permeability germinated seed paper comprises a paper pulp substrate and seeds uniformly dispersed in the paper pulp substrate, wherein the paper pulp substrate is prepared by mixing unbleached softwood pulp and cationic lignocellulose nanofibrils, the cationic lignocellulose nanofibrils account for 4-8% of the absolute dry pulp, and the quantification of the seed paper is 110g/m 2. A method of preparing the high strength, high air permeability, germinated seed paper, comprising the steps of: s1, pulping unbleached softwood pulp by adopting a PFI mill, controlling the pulping concentration to be 10% and the pulping degree to be 50-70 DEG SR; s2, slurry preparation, namely mixing the cationic lignocellulose nanofibrils with the paper pulp treated in the step S1, then scattering seeds, and stirring the mixture at 3000-5000 r of revolution by adopting a fluffer to uniformly mix the paper pulp, the cationic lignocellulose nanofibrils and the seeds; s3, papermaking molding, namely adopting a Kaiser method automatic papermaking system to perform papermaking on the slurry obtained in the step S2, and removing most of water through vacuumizing to mold the paper; S4, drying and preserving, namely placing the paper formed in the step 3 into a dehumidifying and heating room at 40 ℃ for drying and shaping, and collecting and preserving after drying; wherein, the cationic lignocellulose nanofibrils described in step S2 are prepared by the following method: a. Pulping, namely pulping unbleached softwood pulp by adopting PFI (pulse frequency reactor) grinding, wherein the pulping concentration is 10%, and the pulping degree is 90 DEG SR after pulping; b. Alkali treatment, namely taking 1g of absolute dry pulp, adding 100ml of NaOH solution with mass concentration of 5%, and stirring for 1-2 hours at room temperature at 300-500 rpm; c. The etherification reaction is carried out, namely 2, 3-epoxypropyl trimethyl ammonium chloride dissolved in isopropanol is added into the system in the step b, the mass ratio of the 2, 3-epoxypropyl trimethyl ammonium chloride to absolute dry pulp is 3-7 g/g, and the mixture is placed in a constant-temperature water bath kettle for stirring reaction for 2-4 hours at the temperature of 30-70 ℃; d. c, stopping and washing, namely adding 5-7 g of glacial acetic acid into the reaction system in the step c to stop the reaction, and repeatedly washing the slurry with deionized water until the pH value of the washing wastewater is=7; e. and d, ultra-high pressure homogenization, namely diluting the slurry washed in the step d with deionized water, adding the diluted slurry into an ultra-high pressure nano material preparation disperser, regu