A biological treatment method for improving paper strength

A biological treatment and paper strength technology, applied in fiber raw material treatment, textiles and papermaking, etc., can solve problems such as increasing production costs and affecting the effect of paper-making reinforcing agents

Inactive Publication Date: 2011-12-28
QILU UNIV OF TECH
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Problems solved by technology

However, a higher content of anionic garbage will affect the addition effect of traditional p

Method used

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  • A biological treatment method for improving paper strength
  • A biological treatment method for improving paper strength
  • A biological treatment method for improving paper strength

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

detailed description

[0024] The present invention will be further described below in conjunction with the embodiments, but the protection scope of the present invention is not limited thereto.

[0025] The laccase described in the examples was purchased from Novozymes (China) Investment Co., Ltd. with the product number NS51003. Syringaldehyde is analytically pure, and both alkali lignin and lignosulfonate are commercially available products with purity For industrial grade.

Example Embodiment

[0026] Example 1

[0027] A biological treatment method for improving the strength of paper, the steps are as follows:

[0028] (1) Pulping the OCC waste paper with a disintegration concentration of 10%, screening and washing, and beating to a beating degree of 45°SR to prepare a slurry with a material-to-liquid ratio of 5:100 (g / ml);

[0029] (2) Use 0.2M H 2 SO 4 Adjust the pH of the slurry prepared in step (1) to 4.5, add laccase at the addition amount of 10U / g absolute dry slurry, and then divide it into 6 groups, of which 5 groups are added with 0.1% and 0.2 of the weight of the absolute dry slurry. %, 0.3%, 0.4%, 0.5% syringaldehyde, the control pulp group did not add syringaldehyde, stirring for 1 hour at 45°C and the oxygen content of the slurry ≥5mg / L to obtain the biologically treated pulp;

[0030] (3) The biologically treated pulp prepared in step (2) is washed with water until it is colorless, and then the paper is made into paper, dried at 95°C, and then tested.

[0031] ...

Example Embodiment

[0041] Example 2

[0042] The biological treatment method for improving the strength of paper as described in Example 1, the difference is that while adding different amounts of syringaldehyde, 0.2% of industrial alkali lignin (relatively dry pulp) is added and reacted for 1 hour.

[0043] Blank: The preparation method is as above, except that laccase, syringaldehyde and alkali lignin are not added.

[0044] Control pulp: the preparation method is as above, the difference is that syringaldehyde and alkali lignin are not added.

[0045] The detection method is the same as in Example 1.

[0046] The results are shown in Table 2.

[0047] Table 2

[0048]

[0049]

[0050] Analysis: When 0.2% alkali lignin is added, adding different amounts of syringaldehyde can improve the strength performance of paper to varying degrees. According to Table 1, when the same amount of syringaldehyde is added, and the additional 0.2% of industrial lignin is added, higher paper strength, especially wet tensil...

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Abstract

The invention relates to a biological treatment method for improving paper strength, belonging to the technical field of pulping and papermaking. The steps are as follows: Pulping OCC waste paper or unbleached KP pulp, and then beating to prepare pulp; add laccase according to the amount of 8-12U/g dry pulp, and then add syringaldehyde and/or industrial lignin and stirring to obtain the biologically treated pulp; washing the obtained biologically treated pulp with water until the filtrate is colorless, then papermaking and drying. The invention utilizes the characteristic that the aldehyde group of syringaldehyde can be oxidized to carboxyl group, strengthens the hydrogen bond connection between fibers, and improves the dry strength of paper, and the two hydrophobic methyl groups of syringaldehyde are grafted on the fiber, It is beneficial to improve the wet strength of paper. The existence of a large number of phenolic hydroxyl groups in industrial lignin is conducive to the generation of phenolic oxygen radicals, and the crosslinking of free radicals strengthens the bonding strength between fibers and improves the strength of paper.

Description

technical field [0001] The invention relates to a biological treatment method for improving paper strength, in particular to a method for improving paper strength by using laccase combined with syringaldehyde and industrial lignin to treat paper pulp, and belongs to the technical field of pulp and papermaking. Background technique [0002] Environmental pollution and energy shortage are major challenges facing mankind. Adopting environment-friendly technology and making full use of renewable resources are major issues that must be given priority in the implementation of sustainable development strategy in our country. The utilization of old corrugated container board (OCC) pulp is increasing year by year in our country, but it has the disadvantages of poor fiber bonding force and low sheet bonding strength. Unbleached softwood kraft pulp (KP) is a typical chemical pulp in the pulp and paper industry. It has the characteristics of long fiber and simple cell structure. Mecha...

Claims

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Application Information

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IPC IPC(8): D21C5/00
Inventor 刘娜秦梦华徐清华傅英娟
Owner QILU UNIV OF TECH
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