Method for repairing secondary fiber or recycled fiber keratinization

A technology for recycling fibers and secondary fibers, which is applied in the field of pulping and papermaking to achieve the effect of mild conditions and simple repairing process

Active Publication Date: 2018-11-06
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many technical solutions for repairing fiber "keratinization", improving fiber swelling ability, and increasing water retention value, such as mechanical beating or refining, adding chemicals, physical classification of coarse and fine fibers, and mixing virgin fibers. To a certain extent, the fiber swelling ability can be improved, and the degree of fiber keratinization can be improved; however, these methods only compensate and repair fiber keratinization by increasing the active sites of fibers, and do not start from the mechanism that causes fiber keratinization. Starting from the mechanism of keratinization, we can repair keratinization more thoroughly. Here we propose a new repair process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: The method for repairing secondary fiber or recycled fiber keratinization, the specific method is:

[0020] (1) Use a shredder to crush commercially available unbleached eucalyptus kraft dry pulp into 0.3´1cm 2 fragments of

[0021] (2) Add the dry pulp board fragments to the NaOH-urea solution that has been precooled to -13°C, and stir rapidly for 2 minutes. The mass ratio of the dry pulp board fragments to the NaOH-urea solution is 1:10, and the NaOH-urea solution In the solution, the mass concentration of NaOH in the solution is 3%, and the mass concentration of urea in the solution is 5%;

[0022] (3) At room temperature, add regeneration solution to the mixed solution in step (2), add sulfuric acid-sodium sulfate solution, regenerate for 5 minutes under magnetic stirring conditions, and carry out hydrogen bond network reconstruction, wherein the volume of sulfuric acid-sodium sulfate solution and alkaline urine solution The ratio is 1:1, the total m...

Embodiment 2

[0025] Embodiment 2: The method for repairing secondary fiber or recycled fiber keratinization, the specific method is:

[0026] (1) The handwritten sheet made in the laboratory with unbleached eucalyptus kraft dry pulp board as raw material, that is, the handwritten sheet made for the 0th time, and shredded into 0.3´1cm by shredder 2 fragments of

[0027] (2) Add the fragments in step (1) to the NaOH-urea solution that has been pre-cooled to -5°C, and stir rapidly for 2 minutes. The mass ratio of the fragments to the NaOH-urea solution is 1:50, and the NaOH-urea solution The mass concentration of NaOH in the solution is 5%, and the mass concentration of urea in the solution is 10%;

[0028] (3) At 15°C, add regeneration solution to the mixed solution in step (2), add sulfuric acid-sodium sulfate solution, regenerate for 10 minutes under magnetic stirring conditions, and carry out hydrogen bond network reconstruction, in which sulfuric acid-sodium sulfate solution and alkalin...

Embodiment 3

[0031] Embodiment 3: The method for repairing secondary fiber or recycled fiber keratinization, the specific method is:

[0032] (1) Take the 0th handwritten sheet of Example 2 as the raw material and copy it back in the laboratory, that is, the 1st recycled handwritten sheet, and use a shredder to crush the 1st recycled handwritten sheet into 1´1cm 2 fragments of

[0033] (2) Add the fragments in step (1) to the NaOH-urea solution that has been precooled to -10°C, and stir rapidly for 4 minutes. The mass ratio of the fragments to the NaOH-urea solution is 1:100. In the NaOH-urea solution The mass concentration of NaOH in the solution is 8%, and the mass concentration of urea in the solution is 15%;

[0034] (3) At 40°C, add regeneration solution to the mixed solution in step (2), add sulfuric acid-sodium sulfate solution, regenerate for 15 minutes under magnetic stirring conditions, and carry out hydrogen bond network reconstruction, in which sulfuric acid-sodium sulfate sol...

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PUM

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Abstract

The invention discloses a method for repairing secondary fiber or recycled fiber keratinization.The secondary fiber or the recycled fiber is added into an alkali urine solution which has been pre-cooled to a low temperature, then a regeneration liquid is added to reconstitute the fiber hydrogen bond network and repair keratinization, filtered, repeatedly washed to be neutral, so that a fiber pulpis obtained.The repairing method breaks through atraditional partial repairing method, such as pulping, chemical additives, physical grading and mixing, and the like, and has advantages of simplein repair process, mild in condition and thorough in repair. Water retention value after secondary/recycled fiber repair with different reuse times can reach 131.01%-145.57%,which is equivalent to or slightly higher than that of primary fiber, corresponding to having carrying outreversal repair of the keratinization of the secondary fiber or the recycled fiber, so that the process can prolong life cycle of the secondary fiber or the recycled fiber, providing a brand-new technique for pulpand papermaking technology to improve the water retention value of the secondary fiber or the recycled fiber.

Description

technical field [0001] The invention belongs to the technical field of pulping and papermaking, and particularly relates to a repair technology for hornyization of secondary fibers or recycled fibers, which improves the water retention value of secondary fibers or recycled fibers, improves the mechanical properties of paper, and prolongs the production of secondary fibers or recycled fibers. Circular life cycle of fibers. Background technique [0002] Waste paper, also known as secondary fiber or recycled fiber, is a huge amount of recyclable resources. Making full use of it can not only save a lot of plant fiber raw materials, reduce production costs, but also reduce municipal solid waste emissions ,reduce environmental pollution. According to Environmental Protection Agency (EPA) statistics, using secondary / recycled fiber to produce paper can save 50% of water consumption and reduce air pollution by 74% compared with virgin fiber production. In my country, secondary / recy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21B1/30
CPCD21B1/30
Inventor 贾庆明缪应菊陕绍云支云飞苏红莹
Owner KUNMING UNIV OF SCI & TECH
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