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Method for bleaching bamboo pulp

A technology of bamboo pulp and bleaching agent, applied in pulp bleaching, chemical/chemical mechanical pulp, textiles and papermaking, etc., can solve the problems of relatively high requirements for experimental conditions, stimulation of respiratory mucosa, and increased economic costs, and achieve good selectivity, The effect of avoiding damage and reducing energy consumption

Inactive Publication Date: 2020-03-20
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process flow of this method is roughly similar to the bleaching process currently used in factories. The chemicals used, such as acids, alkalis, and hydrogen peroxide, need to be further recycled for utilization. This method will further increase the economic cost, and the chemicals used Great damage to wood, and harmful to the human body, long-term exposure is likely to cause the problem of irritating the respiratory mucosa
[0009] The existing pulp bleaching process uses a variety of chemical substances to bleach pulp, and some processes also use physical methods such as X-rays and ultrasonic waves. The process is more complicated, the experimental conditions are relatively high, and it is easy to cause secondary pollution

Method used

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  • Method for bleaching bamboo pulp

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The total weight of the experiment is 200g, and the ratio of raw material weight of unbleached bamboo pulp to the total weight is 1:10.

[0033] (1) bleaching reaction: take by weighing the unbleached bamboo pulp raw material that 20g obtains through kraft cooking, 50g p-toluenesulfonic acid and 130g distilled water, wherein p-toluenesulfonic acid accounts for 25% of gross weight, heats in water bath to 70°C, stir for 60 minutes, add 200g of distilled water to the reaction vessel to complete the reaction, and obtain a bamboo pulp suspension for later use;

[0034] Adding distilled water can reduce the temperature rapidly, so that the temperature required for the reaction cannot be reached. This practice can ensure the accuracy of the reaction time.

[0035] (2) Filtration: adopt the bamboo pulp suspension of vacuum filtration step (1) gained, separate and obtain bamboo pulp solid product, standby; Dilute the filtrate that obtains with distilled water, separate by settli...

Embodiment 2

[0041] The total weight of the experiment is 200g, and the ratio of raw material weight of unbleached bamboo pulp to the total weight is 1:10.

[0042] (1) bleaching reaction: take by weighing the unbleached bamboo pulp raw material that 20g obtains through kraft cooking, 60g p-toluenesulfonic acid and 120g distilled water, wherein p-toluenesulfonic acid accounts for 30% of gross weight, heats in water bath to 75°C, stir for 45 minutes, add 200g of distilled water to the reaction vessel to complete the reaction, and obtain a bamboo pulp suspension for later use;

[0043] (2) filter: method is with embodiment 1;

[0044] (3) Washing: the method is the same as in Example 1.

[0045] After washing, the yield of the obtained bleached bamboo pulp is 87.78%.

Embodiment 3

[0047] The total weight of the experiment is 200g, and the ratio of raw material weight of unbleached bamboo pulp to the total weight is 1:10.

[0048] (1) bleaching reaction: take by weighing the unbleached bamboo pulp raw material that 20g obtains through kraft method cooking, 100g p-toluenesulfonic acid and 80g distilled water, wherein p-toluenesulfonic acid accounts for 50% of gross weight, heats in water bath to 70°C, stir for 30 minutes, add 200 g of distilled water to the reaction vessel to complete the reaction, and prepare a bamboo pulp suspension for later use;

[0049] (2) filter: method is with embodiment 1;

[0050] (3) Washing: the method is the same as in Example 1.

[0051] After washing, the yield of the bleached bamboo pulp obtained is 87.60%.

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Abstract

The invention provides a method for bleaching bamboo pulp. The method comprises the step of treating sulfate-process unbleached bamboo pulp used as a raw material by using an acidic solubilizing bleaching agent so as to obtain bleached bamboo pulp. As the treated bamboo pulp is subjected to a papermaking process, it is found that when the acidic solubilizing bleaching agent has a medium or low concentration, paper with good performance can be obtained. The method is free of chlorine addition, does not need a high-pressure environment, is good in bleaching selectivity and little in fiber damage; the acidic solubilizing bleaching agent adopted in experiments can be efficiently recycled and repeatedly used through a crystallization technology, so production cost is further reduced; and the method has good application prospects in the field of bamboo pulp bleaching.

Description

technical field [0001] The invention belongs to the technical field of pulping and papermaking technology, and in particular relates to a method for bleaching bamboo pulp. Background technique [0002] my country is quite rich in bamboo plant resources, and the bamboo forest covers an area of ​​7.2 million hm 2 , accounting for 30% of the total bamboo forest in the world, and the types of bamboo plants, the area covered, the accumulation of bamboo resources and the total output of bamboo pulp are all ranked first in the world. It is a non-wood fiber with a wide range of applications. raw material. Bamboo has the characteristics of fast growth, good toughness, and high strength. Bamboo fibers are medium-long fibers in length. Usually, the length of bamboo pulp fibers is between coniferous wood pulp fibers and hardwood pulp fibers. In addition, its higher The aspect ratio makes it have good pulping and papermaking performance, which can be well applied to solve the current sh...

Claims

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Application Information

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IPC IPC(8): D21H11/04D21C9/10D21D5/02
CPCD21C9/10D21D5/02D21H11/04
Inventor 程金兰尹崇鑫任浩翟华敏孙悦雷春发王倩
Owner NANJING FORESTRY UNIV
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