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Preparation method for paper pulp containing multiple functional groups

A multi-functional, pulp technology, applied in pulp bleaching, washing/replacing pulp treatment liquid, papermaking, etc., can solve the problems of low content, fiber swelling and limited increase in paper dry and wet strength

Active Publication Date: 2014-10-15
GOLD EAST PAPER JIANGSU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some carboxyl groups are produced on the fibers during the cooking and bleaching process, their content is low (<0.1mmol / g), and the increase in the swelling of the fibers and the dry and wet strength of the paper is limited

Method used

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preparation example Construction

[0008] A preparation method for pulp containing multifunctional groups, comprising the steps of:

[0009] (1) Provide plant fiber raw materials. The plant fiber is wood fiber or gramineous plant fiber.

[0010] (2) Cooking the plant fiber raw material to obtain pulp, and adding an oxidation system to the pulp after the cooking step for oxidation. The oxidation system may be a TEMPO catalytic oxidation system, periodate, nitrite, sodium chlorite, or sodium hypochlorite, preferably a TEMPO catalytic oxidation system. The oxidation system selectively oxidizes the hydroxyl group (-OH) at the C6 position of the glucose chain of the fiber raw material into a carboxyl group (-COOH), and a small amount is oxidized into an aldehyde group (-CHO). For wood fiber pulps, residual lignin in the pulp can also be partially removed during the oxidation process. The final pulp can be sent to the papermaking workshop for papermaking or for the preparation of cellulose ethers and esters deriva...

Embodiment 1

[0024] The softwood chips are cooked by the KP method (the amount of alkali used for cooking is 20% of the dry pulp, the degree of vulcanization is 24%, the liquid ratio is 1:4, the maximum cooking temperature is 170°C, and the cooking holding time is 180 minutes). The cooked slurry is subjected to TEMPO oxidation (oxidation pH is 10-10.5, the amount of TEMPO is 0.5% of the absolute dry slurry, the amount of NaBr is 5% of the absolute dry slurry, and the amount of NaClO is 1mmol / g absolute dry fiber, the reaction temperature at 30°C). The oxidized slurry was subjected to OD 0 (EO)D 1 D. 2 Bleaching, the bleaching condition is stage O (10% pulp concentration, 3% NaOH of dry pulp, 0.6MPa oxygen pressure, 90°C temperature, 60 minutes); D 0 stage (slurry concentration 10%, treatment time 45 minutes, temperature 50°C, initial pH 2.5, ClO 2 The dosage is 1.3% of the absolute dry slurry); EO section (the slurry concentration is 10%, the NaOH dosage is 3.0% of the absolute dry slu...

Embodiment 2

[0027] The hardwood chips are cooked by the KP method (the amount of alkali used is 16% of the dry pulp, the degree of sulfidation is 20%, the liquid ratio is 1:4, the maximum cooking temperature is 170°C, the heating time is 90 minutes, and the cooking holding time is 150 minutes). The cooked pulp is subjected to TEMPO oxidation (oxidation pH is 10-10.5, the amount of TEMPO is 0.5% of the absolute dry pulp, the amount of NaBr is 5% of the absolute dry pulp, the amount of NaClO is 6mmol / g absolute dry fiber, the reaction temperature at 30°C). The oxidized slurry was subjected to OD 0 (EO)D 1 Bleaching, the bleaching condition is stage O (the pulp concentration is 10%, the NaOH dosage is 3% of the dry pulp, the oxygen pressure is 0.4MPa, the temperature is 90°C, the initial pH is 10-11, and the time is 60 minutes); D 0 stage (slurry concentration 10%, treatment time 30 minutes, temperature 50°C, initial pH 2.5, ClO 2 The dosage is 1.0% of the dry slurry); EO section (slurry ...

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Abstract

A preparation method for paper pulp containing multiple functional groups comprises the following steps: providing vegetable fiber raw material; boiling the vegetable fiber raw material to prepare paper pulp; and after boiling is finished, adding an oxidation system into the paper pulp to perform oxidation modification on the fiber raw material. The oxidation system employs one of TEMPO catalytic oxidation system, a periodate, a nitrite, sodium chlorite and sodium hypochlorite. By adding the oxidation system for oxidizing fiber after the boiling step, paper pulp rich in aldehyde group and carboxyl functional group is obtained, aldehyde group is beneficial for improving the wet strength of paper, and carboxyl is beneficial for reducing energy consumption of beating and increasing the strength of paper. Additionally, the paper pulp rich in multiple functional groups is relatively easy for preparation of cellulose ether and ester derivatives.

Description

technical field [0001] The invention relates to a preparation method of pulp containing multifunctional groups. Background technique [0002] Cellulose is a linear polymer formed by β-D glucopyranose via 1,4 glycosidic bonds, in which there are primary hydroxyl groups on C6 and secondary hydroxyl groups on C2 and C4. These active hydroxyl groups impart strength to paper through intermolecular hydrogen bonding, and are also reaction points for preparing cellulose derivatives through cellulose modification technology. After the hydroxyl group is oxidized, it can generate aldehyde and carboxyl functional groups. In the paper industry, the aldehyde group can give paper better wet strength by forming a hemiacetal structure; the carboxyl group will promote the swelling of the fiber, which is beneficial to the beating of pulp and paper Physical strength; fibers rich in aldehyde and carboxyl groups can also prepare derivatives such as cellulose ethers and esters to improve the func...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B15/02C08B15/04
CPCD21C5/00D21C9/10D21C3/026D21C9/02
Inventor 马朴刘翔飞秦昀昌王仁荣
Owner GOLD EAST PAPER JIANGSU
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