Paper pulp preparation method

A technology of pulp and fiber pulp, which is applied in the field of industrial papermaking, can solve the problems of poor pulp quality, achieve good results, increase the tensile index, and improve the internal bonding strength

Active Publication Date: 2018-04-10
GUANGDONG IND TECHN COLLEGE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Based on this, it is necessary to provide a pulp prepar

Method used

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Examples

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Embodiment 1

[0022] The present embodiment provides a kind of preparation method of pulp, comprises the steps:

[0023] Step 1: Obtain cellulose, prepare fiber pulp, and adjust the water content of the obtained fiber pulp to 50-70 wt%.

[0024] The cellulose content of this step fiber pulp is 20g; The fiber pulp of this step has also carried out pretreatment: namely earlier it is diluted to mass concentration and be 1.5% fiber suspension (fiber suspension quality is 1333g), in the paper pulp disintegrating machine 10,000 revolutions for deflammation to completely separate the fibers.

[0025] In this step, after the pretreatment, the above-mentioned fiber suspension is concentrated to a cellulose concentration of 40wt% (that is, the quality of the concentrated pulp is 50g), wherein the cellulose content is 20g, and the water content is 30g (60wt%).

[0026] Step 2, adding acetic anhydride to the fiber pulp obtained in step 1, adjusting the temperature, starting hydrolysis reaction and est...

Embodiment 2

[0035] This example is a modification of Example 1. Compared with Example 1, the only change is that the mass ratio of cellulose, acetic anhydride, and acetic acid in step 1 is 1:3:8.

Embodiment 3

[0037] This example is a variation example of Example 1. Compared with Example 1, the only difference is that the temperature of the esterification reaction in Step 2 is 98°C.

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Abstract

The invention discloses a paper pulp preparation method which comprises the following steps: Step one, obtaining cellulose, preparing fiber pulp, adjusting the water content of the obtained fiber pulpto 50-70 wt%; and Step two, adding excess acetic anhydride into the fiber pulp according to the water content for hydrolysis reaction under the conditions of the temperature not higher than 70 DE C;adjusting the mass ratio of cellulose, acetic anhydride and acetic acid in the hydrolysis system to 1: (2-3): (8-12) for esterification reaction under the conditions of the temperature higher than 80DEG C. The water-containing fiber pulp can be directly taken as an object of treatment, the cellulose is modified with the acetic anhydride in a water phase without adding of other chemical aids, andan acetyl group is moderately introduced to reduce chemical pulp crystallinity, increase water retention value, increase layer-to-layer bond strength and improve long resistance index, and the effectis still good after many times of use.

Description

technical field [0001] The invention relates to the technical field of industrial papermaking, in particular to a pulp preparation method. Background technique [0002] Waste paper is the main raw material for the production of newsprint, packaging paper and cardboard core. Waste paper pulping makes full use of natural resources and reduces environmental pollution. However, during the recycling process, waste paper undergoes beating, pressing, and drying processes. As the number of reuses increases, the physical strength of waste paper decreases significantly, and the quality of pulp decreases. Studies have shown that the reduction of pulp quality is caused by the keratinization of pulp fibers, that is, during the recycling process of chemical pulp, drying makes the pores in the fiber cell walls irreversibly closed, resulting in a decrease in the swelling ability of the pulp and a decrease in the flexibility of the fibers. The bonding is not tight and the strength of the pa...

Claims

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Application Information

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IPC IPC(8): C08B15/02C08B3/06D21H17/14
CPCC08B3/06C08B15/02D21H17/14
Inventor 王宝玉李荣
Owner GUANGDONG IND TECHN COLLEGE
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