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Totally chlorine-free bleaching method of bamboo pulp for producing Daqian writing and painting paper

A completely chlorine-free, painting and calligraphy paper technology, applied in pulp bleaching, cellulose pulp post-processing, papermaking, etc., can solve problems such as pollution, reduce pollution load, reduce processing difficulty, and achieve good product quality and stability.

Active Publication Date: 2013-01-02
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method adopts three-stage bleaching, which effectively solves the pollution problem of bleaching bamboo pulp used in the production of Daqian calligraphy and painting paper, and has a significant effect on realizing the sustainable development of Daqian calligraphy and painting paper and driving local economy

Method used

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  • Totally chlorine-free bleaching method of bamboo pulp for producing Daqian writing and painting paper
  • Totally chlorine-free bleaching method of bamboo pulp for producing Daqian writing and painting paper
  • Totally chlorine-free bleaching method of bamboo pulp for producing Daqian writing and painting paper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Raw materials: unbleached bamboo pulp made by kraft method, whiteness of unbleached bamboo pulp is 31.7%ISO, kappa number is 20.8, viscosity is 1056ml / g, beating degree is 11.70 Sr.

[0032] The bleaching process is as follows:

[0033] (1) Oxygen delignification bleaching: adjust the concentration of the unbleached bamboo pulp to 8%, introduce oxygen into the pulp, and the pressure of oxygen is 0.3MPa, then add sodium hydroxide, magnesium sulfate, and bleaching aids, React at 120°C for 30 minutes, wash the slurry after the reaction, and store the washed slurry for use in the next bleaching process. The weights of sodium hydroxide, magnesium sulfate and bleaching aids are respectively 5.0%, 0.8% and 0.1% of the absolute dry weight of the slurry. Among them, the bleaching aid is composed of the following components by weight percentage: 15% sodium dodecylbenzene sulfonate, 20% sodium lignosulfonate, 22% anthraquinone derivatives, 29% sodium sulfite, 14% sodium tripolyph...

Embodiment 2

[0044] Raw materials: exactly the same as Example 1.

[0045] The bleaching process is as follows:

[0046] (1) Oxygen delignification and bleaching: adjust the concentration of unbleached bamboo pulp to 10%, introduce oxygen into the pulp, the pressure of oxygen is 0.6MPa, then add sodium hydroxide and magnesium sulfate, at 100°C, React for 60 minutes, wash the slurry after the reaction, and store the washed slurry for use in the next bleaching process. Wherein, the weights of sodium hydroxide and magnesium sulfate are respectively 4.0% and 1.0% of the absolute dry weight of the slurry.

[0047] (2) Peroxyacid bleaching: Take the slurry prepared in step (1), add water to adjust the concentration to 5%, then add peroxysulfuric acid to it, adjust the pH value of the slurry to 4.5, then add DTPA to it, at 90°C Next, react for 120min. After the reaction, the slurry is washed, and the washed slurry is stored for the next bleaching process. Wherein, the weights of peroxysulfuric...

Embodiment 3

[0057] Raw material: Unbleached bamboo pulp prepared by Sichuan Yongfeng Pulp & Paper Co., Ltd. by kraft method. The whiteness of the unbleached pulp is 32.3% ISO, the kappa number is 19.4, the viscosity is 1097ml / g, and the beating degree is 13.1 0 Sr.

[0058] The bleaching process is as follows:

[0059] (1) Oxygen delignification bleaching: adjust the concentration of unbleached bamboo pulp to 10%, pass oxygen into the pulp, and the pressure of oxygen is 0.6MPa, then add sodium hydroxide, magnesium sulfate, and bleaching aids, at 120 ℃, react for 30min, wash the slurry after the reaction, and store the washed slurry for use in the next bleaching process. The weights of sodium hydroxide, magnesium sulfate and bleaching aids are respectively 3.0%, 0.5%, and 0.3% of the absolute dry weight of the slurry. Among them, the bleaching aid is composed of the following components by weight percentage: 5% sodium dodecylbenzene sulfonate, 17% sodium lignosulfonate, 15% anthraquinone...

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Abstract

The invention discloses a totally chlorine-free bleaching method of bamboo pulp for producing Daqian writing and painting paper and aims to solve problem that the bamboo pulp for producing Daqian writing and painting paper in the prior art is subjected to two-stage hypochlorite bleaching, centralized pulping allows for centralized treatment of wastewater which can meet the existing emission standard of China, and still the wastewater contains dioxin and furan compounds which are discharged into the environment with the wastewater so as to badly influence the environment. The totally chlorine-free bleaching method includes the steps of oxygen delignification bleaching, peracid bleaching, and sodium hydrosulfite bleaching. By bleaching the bamboo pulp for producing the Daqian writing and painting paper, yield and strength of fiber can be guaranteed, pollution load caused by bleaching effluent can be reduced greatly, subsequent treatment is facilitated, and energy conservation and emission reduction are achieved. The pulp produced by the totally chlorine-free bleaching method can fully meet the production requirements of Daqian writing and painting paper, and advantages for sustainable development of Daqian writing and painting paper are created.

Description

technical field [0001] The invention relates to the field of pulping and papermaking, in particular to a bleaching method, in particular to a completely chlorine-free bleaching method of bamboo pulp used in the production of Daqian calligraphy and painting paper. Background technique [0002] Daqian calligraphy and painting paper, also known as Jiajiang Xuan paper, has a history of thousands of years. It is the creation and invention of the working people in practice. It is the crystallization of the wisdom of the working people. It has a very rich cultural heritage and historical value. Included in the national intangible cultural heritage. In recent years, with the continuous strengthening of the country's environmental protection, the inheritance and development of Daqian calligraphy and painting paper have encountered great challenges. Because Daqian calligraphy and painting paper is mainly produced in workshops, it has the characteristics of multiple points and wide ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C9/16D21C9/147D21C9/10
Inventor 李文俊杨玲谢斌
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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