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Pulp using rice grass and wheatgrass as raw material and preparation method thereof

A pulp and wheat straw technology, which is applied in the fields of cellulose raw material pulping, textile and paper making, and fiber raw material processing, etc., can solve the problems of lack of involvement.

Active Publication Date: 2007-12-19
SHANDONG FUYIN PAPER & ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Although the slurry prepared by the above method has obtained good results on the brightness and the strength of the pulp, they have not been involved in the most grass raw materials in my country: rice straw and wheat straw. This application is also intended to obtain wheat straw and rice straw. Bleached chemical pulp with good strength made as raw material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] After the dry preparation, the rice straw is mixed and impregnated with the ammonium sulfite solution of 9% absolute dry rice straw in the dipping screw machine through the dipping screw machine, and then sent to the steaming ball. 0.6%, the liquid ratio is 1:3, the steaming ball is idling for 20 minutes after the straw is filled; after that, the steam is heated once to raise the temperature to 100°C, and the temperature is kept at this temperature for 30 minutes, and then the steam is released for 20-30 minutes. Start steaming for the second heating, raise the temperature for 30 minutes to 165°C, and keep warm for 80 minutes; add black liquor to the steaming ball to adjust the concentration, adjust the concentration to 10%, and keep the pressure at 0.75MPa for spraying, at this time The hardness of the pulp is potassium permanganate value 20, which is equivalent to a kappa value of 32, the pH value at the end of cooking is 11, the residual alkali concentration in the bl...

Embodiment 2

[0046] The wheat straw after preparing materials by the method is sent into the steaming ball, and the caustic soda solution of 10% to the absolute dry raw material is added in the steaming ball, the addition of anthraquinone is 0.7% of the absolute dry raw material, the liquid ratio is 1:4, and the wheat straw is filled Afterwards, the steaming ball is idling for 20 minutes; after that, heat up to 110°C with steam, keep warm at this temperature for 20 minutes, and let off steam for 20-30 minutes, start steaming for the second heating, and raise the temperature for 30 minutes to reach the temperature at 168°C, keep warm for 90 minutes; add black liquor into the steaming ball to dilute, and at the same time keep the pressure at 0.75MPa for spraying. The pH value is 12 and the residual alkali concentration in the black liquor is 12 g / l. The yield of the prepared high hardness pulp was 62%. The wheat straw is cooked by the ammonium method, and the hardness of the wheat straw pul...

Embodiment 3

[0048] After the dry preparation, the straw is mixed and impregnated with a mixture of 12% sodium hydroxide solution and black liquor in the dipping auger. The waste liquid extracted from the straw is then sent to the steaming ball, the amount of anthraquinone added is 0.8% of the absolute dry raw material, the liquid ratio is 1:2.5, and the steaming ball is idling for 20 minutes after the straw is filled; after that, the steam is heated once , heat up to 120°C, keep warm at this temperature for 40 minutes, then let off steam for 20-30 minutes, start to pass steam for the second heating, raise the temperature for 30 minutes to 173°C, keep warm for 90 minutes; keep the pressure at 0.75MPa for spraying . Now the hardness of pulp is potassium permanganate value 17 which is equivalent to kappa number 25, meanwhile, the pH value is 12 when cooking end point, and the residual alkali concentration in the black liquor is 14g / l. The yield of the high hardness pulp is 64%. Then add bl...

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Abstract

The present invention relates to a paper pulp prepared by using rice straw and wheat straw as raw material. The breaking length of said paper pulp is 4500-8100 km. and its tearing strength is 180-280 mN. Besides, said invention also provides its preparation method and concrete steps.

Description

technical field [0001] The present invention relates to a pulp made of rice straw and wheat straw and a preparation method of the pulp. Background technique [0002] Plant fiber raw materials for papermaking can be roughly divided into three categories: wood fiber, grass fiber and cotton fiber. [0003] Wood fibers are divided into coniferous wood and hardwood, and the morphology of the two fibers is very different. Coniferous wood fiber: Due to the long length of the fiber, the fiber is relatively soft, and the content of fine components is very small, it is easy to produce high-strength paper, and it is an excellent raw material for papermaking. Hardwood fiber: Due to the short fiber and high content of vessels and parenchyma cells, the strength of paper is not as good as that of softwood pulp. Due to the poor interweaving of vessels and fiber network, it is easy to produce powder and hair loss, but the short fiber has a great impact on the paper. Stiffness and smoothnes...

Claims

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Application Information

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IPC IPC(8): D21H11/12D21H11/02D21C3/00
Inventor 杨吉慧宋明信陈松涛李洪法宋建军
Owner SHANDONG FUYIN PAPER & ENVIRONMENTAL PROTECTION TECH
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