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Method for treating paper pulp by using 1-allyl-3-methylimidazole chloride

The technology of methyl imidazole and allyl group is applied in the field of pulp processing, which can solve the problems of high energy consumption for beating, and achieve the effects of improving physical indicators, reducing damage and improving physical properties.

Inactive Publication Date: 2010-08-18
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the shortage of large energy consumption for beating, the present invention provides a method for treating pulp with 1-allyl-3-methylimidazolium chloride that can reduce energy consumption for beating and improve beating performance

Method used

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  • Method for treating paper pulp by using 1-allyl-3-methylimidazole chloride

Examples

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Effect test

Embodiment 1

[0014] Pine radiata chemical pulp is routinely beaten to a beating degree of 50.0°SR, the beating energy consumption is 520kW·h / t pulp, the fiber length is 2.28mm, and the fine component content is 8.5%. Use this slurry to make quantitative 70g / m 2 Cultural paper, the bulk thickness of the finished paper is 1.87cm 3 g -1 , burst index 2.64KPa m 2 g -1 , Tensile index 47.8N m / g, folding number 572 times, tear index 6.12mN m / g 2 g -1 , the napping speed (representing the surface strength of the paper) is 1.12m / s, and the K&N value (representing the printing ink absorption, the lower the K&N value, the higher the printing gloss, the lower the ink consumption, and the better the printing performance) is 21.4.

[0015] The method of the invention is used to treat the radiata pine chemical pulp. Steps: Before beating, the pulp is concentrated, dried and dehydrated to a moisture content of 1.5%, and then the pulp is treated with 1-allyl-3-methylimidazolium chloride, and the tre...

Embodiment 2

[0018] Wheat straw chemical pulp is routinely beaten to a beating degree of 36.5°SR, the beating energy consumption is 365kW·h / t pulp, the fiber length is 1.15mm, and the fine component content is 15.3%. Use this slurry to make quantitative 70g / m 2 Cultural paper, the bulk thickness of the finished paper is 1.82cm 3 g -1 , burst index 1.54KPa m 2 g -1 , Tensile index 41.6N·m / g, folding number 378 times, tear index 4.65mN·m 2 g -1 , the pulling speed is 1.01m / s, and the K&N value is 21.8.

[0019] The method of the invention is used to treat the wheat straw chemical pulp. Steps: Before beating, the pulp is concentrated, dried and dehydrated to a moisture content of 1.8%, and then the pulp is treated with 1-allyl-3-methylimidazolium chloride, and the treatment condition is 1-allyl-3-methylimidazolium chloride Chemical dosage 12L / kg pulp, steam indirect heating, temperature 70°C, time 120min, wash pulp after treatment to remove 1-allyl-3-methylimidazolium chloride, recover...

Embodiment 3

[0022] The poplar high-yield pulp is beaten to a beating degree of 52.0°SR, the energy consumption of beating (fine refining) is 1050kW·h / t pulp, the fiber length is 0.92mm, and the fine component content is 22.8%. Using this slurry to make paper with a basis weight of 75g / m 2 , the bulk thickness of the paper is 3.15cm 3 g -1 , burst resistance index 2.25KPa·m 2 g -1 , tensile index 32.5N m / g, tear index 3.27mN m / g 2 g -1 , the pulling speed is 0.85m / s, and the K&N value is 25.6.

[0023] The method of the invention is used to treat the poplar high-yield pulp. Steps: after a period of rough refining, the poplar high-yield pulp is treated, the pulp is first concentrated, dried and dehydrated to a moisture content of 2.0%, and then the pulp is treated with 1-allyl-3-methylimidazolium chloride. The conditions are 1-allyl-3-methylimidazolium chloride dosage 8L / kg pulp, steam indirect heating, temperature 120°C, time 20min, pulp is washed after treatment, and 1-allyl-3-meth...

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Abstract

The invention discloses a method for treating paper pulp by using 1-allyl-3-methylimidazole chloride, comprising the steps of: carrying out concentration drying dehydration on the paper pulp, and then filling the 1-allyl-3-methylimidazole chloride to treat the paper pulp; after treatment, washing the paper pulp by water for removing the 1-allyl-3-methylimidazole chloride; and then, entering the pulping work section for pulping. The 1-allyl-3-methylimidazole chloride removed by water washing can be recycled by simple dehydration. The method has simple operation, reduces the damage for fiber due to pulping and improves the physical performance of paper. The paper pulp treated by the method reduces the pulping energy consumption, improves the fiber quality of the paper pulp, and enhances the physical indexes such as strength, surface performance, printing performance and the like of paper. In addition, the used 1-allyl-3-methylimidazole chloride can be recycled, thus being environment-friendly.

Description

technical field [0001] The invention relates to a pulp treatment method, in particular to a method for treating pulp with 1-allyl-3-methylimidazolium chloride. Background technique [0002] Beating is a part of the papermaking process. During the beating process, in addition to the shearing, kneading and carding of the machine parts, the fiber cell wall also undergoes displacement, deformation and rupture to absorb water and swell, resulting in fibrillation. It makes the pulp soft and plastic, and also makes the hydroxyl group in the cellulose molecular chain increase the chance of combining with the hydrogen chain, and improves the binding force between fibers. The beating performance affects the quality of the paper. The existing beating process has the problem of high beating energy consumption, and according to different beating methods, the paper will also show some defects. For example, the paper is easy to fluff, the ink absorption effect is poor, etc. Contents of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/18
Inventor 陈嘉川庞志强杨桂花董翠华刘玉
Owner QILU UNIV OF TECH
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