Activating method of cellulose pulp

A technology of cellulose pulp and activation method, which is applied in the field of preparation of cellulose fiber by solvent method, can solve the problems of physical hazards for operators, high investment, large energy consumption, etc., achieve improved reaction performance, save production costs, and improve utilization rate effect

Active Publication Date: 2017-01-04
CHINESE TEXTILE ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires high equipment investment and high energy consumption, and at the same time causes physical harm to operators.

Method used

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  • Activating method of cellulose pulp
  • Activating method of cellulose pulp

Examples

Experimental program
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Effect test

Embodiment 1

[0041] A kind of activation method of cellulose pulp, select the wood pulp of degree of polymerization 550 as selection material, pretreatment steps are as follows:

[0042] 1. Add 1 / 2 volume of activation water to the medium-concentration hydraulic pulper, the water temperature is 55-60°C, and add formic acid according to the ratio of formic acid: activation water = 1:100;

[0043] 2. According to the weight ratio of activation water:pulp=100:5, put the pulp into the pulper for activation, and activate the pulp for 60 minutes, keep stirring, and the stirring frequency is 40Hz;

[0044] 3. After the pressing step and the crushing step, the cellulose content of the pretreated pulp is 45%, and the cellulose crushing degree is 260g / L;

[0045] 4, dissolving step, the pulp obtained through pretreatment and NMMO+H 2 O (the concentration of NMMO in the system is about 85%) mixed, the excess water is removed by heating or vacuuming, the vacuum degree is -5kpa, the temperature is 110...

Embodiment 2

[0047] A kind of activation method of cellulose pulp, select the wood pulp of degree of polymerization 1000 as selection material, pretreatment steps are as follows:

[0048] 1. Add 1 / 2 volume of activation water to the medium-consistency hydraulic pulper, the water temperature is 25-30°C, and add sodium hydroxide according to the proportion of sodium hydroxide: activation water = 1:200;

[0049] 2. According to the weight ratio of activation water: pulp = 100:5, add the pulp into the pulper for activation, and activate the pulp for 15 minutes;

[0050] 3. After the pressing step and the crushing step, the cellulose content of the pretreated pulp is 50%, and the cellulose crushing degree is 260g / L;

[0051] 4, dissolving step, the pulp obtained through pretreatment and NMMO+H 2 O (the concentration of NMMO in the system is about 82%) mixed, the excess water is removed by heating or vacuuming, the vacuum degree is -6kpa, the temperature is 110°C, the cellulose first swells and...

Embodiment 3

[0053] A kind of activation method of cellulose pulp, select the wood pulp of degree of polymerization 500 as selection material, pretreatment steps are as follows:

[0054] 1. Add 1 / 2 volume of activation water to the medium-consistency hydraulic pulper, and the water temperature is 45-50°C;

[0055] 2. According to the weight ratio of activation water: pulp = 100:5, add the pulp into the pulper for activation, and activate the pulp for 30 minutes;

[0056] 3. After the pressing step and the crushing step, the cellulose content of the pretreated pulp is 45%, and the cellulose crushing degree is 260g / L;

[0057] 4, dissolving step, the pulp obtained through pretreatment and NMMO+H 2 O (the concentration of NMMO in the system is about 85%) mixed, the excess water is removed by heating or vacuuming, the vacuum degree is -5kpa, the temperature is 110°C, the cellulose first swells and then dissolves, and finally an amber uniform and transparent spinning solution.

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Abstract

The invention relates to a preparation method of solvent-spun cellulose fiber (Lyocell), and more specifically relates to an activating method of cellulose pulp. The activating method comprises following three cellulose pretreatment methods: a, acid activation; b, alkaline activation; and c, water activation. The activating method comprises following steps: firstly, an activating reagent is delivered into a pulper for acid activation, alkaline activation, and water activation of cellulose, wherein the activating reagent is selected from water, water containing an acid, or water containing an alkaline, and the temperature of the activating reagent is controlled to be 25 to 60 DEG C; an obtained pulp is delivered into the pulper for 15 to 60min of pulping activating, and then is subjected to pressing and smashing so as to obtain a pretreated pulp, wherein the cellulose content of the pretreated pulp ranges from 45 to 80%. According to the activating method, a trace acid is used for activating cellulose, only physical swelling of cellulose crystalline regions is caused, and no chemical reaction is carried out, so that raw material utilization ratio is increased, and production cost is reduced.

Description

technical field [0001] The invention relates to a method for preparing cellulose fiber by a solvent method, in particular to a method for activating cellulose pulp. Background technique [0002] The new solvent cellulose fiber is a new type of green fiber, which is made of wood pulp as the main raw material and NMMO / H 2 O is a solvent, a new type of environmentally friendly fiber (Lyocell) prepared by dry-wet spinning, this fiber can be decomposed naturally, and has excellent spinnability and wearability. Compared with traditional viscose fiber production, its production process will not produce toxic gases (such as: CS 2 、H 2 S) Pollution of the environment. As the invention patent of ZL03128496.5, the patent No. adopts the traditional viscose method to produce bamboo fiber. This production process not only pollutes seriously, but also the whole production process is long and the production cost is high. [0003] At present, the use of cellulose in the production proces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F2/06D01C1/02
Inventor 张东徐纪刚李克元李海鹏杨聪吴振兴迟克栋高魏庞雨
Owner CHINESE TEXTILE ACAD
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