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Stacking-assembled reinforced paper base as well as preparation method and application thereof

A paper-based, pulp fiber technology, applied in the field of papermaking, to achieve the effect of expanding the scope of application

Active Publication Date: 2017-12-29
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, through the application of layer-by-layer deposition technology, the use of oppositely charged nano-chitin crystals / nano-cellulose to alternately deposit on the surface of pulp fibers to build an orderly multi-layer structure to improve the physical properties of paper has not been reported so far.

Method used

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  • Stacking-assembled reinforced paper base as well as preparation method and application thereof
  • Stacking-assembled reinforced paper base as well as preparation method and application thereof
  • Stacking-assembled reinforced paper base as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] A laminated and assembled reinforced paper base, the preparation method of which is as follows:

[0067] (1) The addition amounts of NaBr, TEMPO (2,2,6,6-tetramethylpiperidine-nitrogen-oxide) and NaClO per gram of dry wheat straw were 0.15g, 0.015g and 0.6g, respectively. The concentration is 2wt% (slurry concentration during the TEMPO oxidation reaction of wheat straw), the reaction time is 1.5h, the pH=10.0-10.3, and the stirring speed is 500r / min. Then use a high-pressure homogenizer to process 5 times under a pressure of 20000 psi to obtain nanocellulose, and prepare a suspension with a mass fraction of 0.1%, that is, nanocellulose suspension.

[0068] (2) Chitin is placed in hydrochloric acid with a mass fraction of 12% (the amount of hydrochloric acid with a mass fraction of 12% is 30ml per gram of chitin), heated to 105°C, hydrolyzed at 300r / min for 1h, and then Centrifuge several times under the condition of 10000r / min until the suspension is separated and plac...

Embodiment 2

[0072] (1) The addition amounts of NaBr, TEMPO (2,2,6,6-tetramethylpiperidine-nitrogen-oxide) and NaClO per gram of dry wheat straw were 0.15g, 0.015g and 0.6g, respectively. The concentration is 2wt%, the reaction time is 1.5h, the pH=10.0-10.3, and the stirring speed is 500r / min. Then use a high-pressure homogenizer to process 5 times under the pressure of 20000 psi to obtain nanocellulose, and then prepare a suspension with a mass fraction of 0.1%, that is, nanocellulose suspension.

[0073] (2) Chitin is placed in hydrochloric acid with a mass fraction of 12% (the amount of hydrochloric acid is 30ml relative to each gram of chitin), heated to 105°C, hydrolyzed at 300r / min for 1h, and then heated at 10000r / min Conditional centrifugation several times until the suspension is separated and placed in a dialysis bag (molecular weight cut-off of 14,000) to wash to neutrality, and the chitin whiskers are concentrated to a mass fraction of 0.1% using a rotary evaporator to obtain ...

Embodiment 3

[0077] (1) The addition amounts of NaBr, TEMPO (2,2,6,6-tetramethylpiperidine-nitrogen-oxide) and NaClO per gram of dry wheat straw were 0.15g, 0.015g and 0.6g, respectively. The concentration is 2wt%, the reaction time is 1.5h, the pH=10.0-10.3, and the rotation speed is 500r / min. Then use a high-pressure homogenizer to process 5 times under a pressure of 20000 psi to obtain nanocellulose, and prepare a suspension with a mass fraction of 0.1%, that is, nanocellulose suspension.

[0078] (2) Chitin is placed in hydrochloric acid with a mass fraction of 12% (the amount of hydrochloric acid is 30ml relative to each gram of chitin), heated to 105°C, hydrolyzed at 300r / min for 1h, and then heated at 10000r / min Conditional centrifugation several times until the suspension is separated and placed in a dialysis bag (molecular weight cut-off of 14,000) to wash to neutrality, and the chitin whiskers are concentrated to a mass fraction of 0.1% using a rotary evaporator to obtain nano-ch...

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Abstract

The invention discloses a stacking-assembled reinforced paper base as well as a preparation method and an application thereof. The preparation method of the paper base comprises the following steps: (1) mixing nanocellulose with water to obtain a nanocellulose suspension; (2) hydrolyzing chitin with an acid to obtain a nano-chitin whisker suspension; (3) adding a Na2SO4 solution and the nano-chitin whisker suspension obtained in the step (2) to coniferous wood paper pulp, regulating pH, and performing stirring and deposition to obtain composite fibers I; (4) adding the Na2SO4 solution and the nanocellulose suspension obtained in the step (1) to the composite fibers I obtained in the step (3), regulating pH, stirring the mixed solution, and depositing a second layer on the composite fibers I to obtain composite fibers II; (5) repeating the step (3) and the step (4), and making paper from the stacking-assembled composite fibers to obtain the stacking-assembled reinforced paper base. The obtained stacking-assembled reinforced paper base can be applied to the field of special paper, food packaging or antibacterial materials.

Description

technical field [0001] The invention belongs to the technical field of papermaking, and in particular relates to a laminated and assembled reinforced paper base and a preparation method and application thereof. Background technique [0002] Due to the increasing demand for high-strength paper and cardboard at home and abroad, how to improve the strength of paper and cardboard on the basis of the current situation of using a large amount of waste paper as pulp and paper raw materials in my country has become an urgent problem to be solved. Due to the recycling of a large amount of waste paper, The bond strength between fibers is greatly affected. The main factors affecting the strength of paper are: the strength of the fiber itself, the bonding strength between fibers and the distribution of paper fibers. Among the above factors, it is relatively easy to improve the bonding strength between fibers, and the hydrogen bonding force is the main way to affect the bonding between f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H13/30D21H11/20
CPCD21H11/20D21H13/30
Inventor 田晓俊李金鹏王斌陈克复
Owner SOUTH CHINA UNIV OF TECH
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