CN1648294A - Viscose fiber produced from reed pulp and its preparing method - Google Patents

Abstract

The technological process of producing viscose fiber with reed pulp includes the steps of: preparing material, cutting, washing, pre-treating, digesting, sieving, eliminating pith, extruding, re-selecting, chlorination, alkali extraction, bleaching, acid treatment, picking, soaking, squeezing, crushing, ageing, yellowing, dissolving, mixing, filtering, defoaming, filtering, spinning, cutting, refining, drying and packing. The viscose fiber thus produced is soft, smooth, high in hygroscopicity and easy dyeing. The present invention provides textile industry one new kind of material fiber.

Description

Viscose that makes by reed pulp and preparation method thereof

Technical field

The present invention relates to produce viscose and preparation method thereof by reed.

Technical background

At present, viscose is to be raw material with native celluloses such as timber, cotton linters, a kind of broad-spectrum regenerated celulose fibre that makes through a series of processing procedures such as boiling, acid treatment, bleaching.Along with the worsening shortages of traditional raw materials such as timber, cotton linter, production cost sharply rises, and therefore, it is imperative that new raw material is explored in exploitation; From dress, health equal angles, also more characteristic requirement is proposed textile raw material simultaneously.

Summary of the invention

The object of the present invention is to provide a kind of viscose that utilizes the reed plant material to produce.It is that employing reserves reed abundant, fast growing is that raw material is through special PROCESS FOR TREATMENT, the characteristic that not only has common viscose fiber, also have softness, smooth, absorb-discharge humid strong, be convenient to characteristics such as dyeing, for field of textiles provides a kind of novel material fiber.

Another purpose of invention is to provide a kind of preparation method of viscose, and this method comprises: big active alkali-hydrogen peroxide boiling.

Adopt big active alkali-hydrogen peroxide boiling in preparation process, its conditions of cooking is as follows: alkali charge: in NaOH to oven dry stock amount 30-50%; Hydrogen peroxide consumption: with H ₂O ₂Count the 0.2-1.0% of oven dry stock amount; Liquor ratio: 1: 2-4; Holding temperature: 125-160 ℃; Temperature retention time: 120-240 branch.Cooking quality: KMnO ₄Value 3-6; The degree of polymerization 〉=800DP; First fibre 〉=95.5%.Adopt big active alkaline cooking, and the adding hydrogen peroxide is one of essential condition of the present invention in digestion process.

Certainly,, raw material is got the raw materials ready, blank, washed material etc. no matter adopt which kind of digesting technoloy, removing impurity such as silt, chip, the conventional steps that all is absolutely necessary, and also this also is known to those skilled in the art.

After the boiling, because the marrow processing be screened, be removed to the characteristics of reed itself also must to steaming disposed slurry, the equipment of utilization is ZSL ₄Screen centrifuge, its process conditions are: sieve aperture φ 1-2mm, advance to starch concentration 0.8-2%, very starch concentration 0.6-1.5%, tailings concentration 1-2%.After steaming slurry being screened, remove marrow handles.

Through after roughly selecting, can push slurry, desanding, concentrate, removing foreign material such as silt, irony, and be concentrated into technological requirement by thickener.It is to be noted that these conditions can do suitable adjustment as the case may be, this is known to those skilled in the art.

In desanding, after concentrating is chlorination, and chlorination can be carried out in the chlorination tower; The alkali extracting is carried out in the tower in alkalization, and concrete technical conditions are: temperature 60-90 ℃, time 90-180 branch, alkali charge: in NaOH to oven dry stock amount 2-4%.Carry out the alkali extracting after the chlorination.These treatment steps and treatment conditions are conspicuous to those skilled in the art, and can suitably adjust as required and change.These adjustment and change are all within the scope of the invention.

In order to ensure pulp brightness, should bleach it.In the present invention, can use conventional method for bleaching, bleaching is carried out in bleaching machine; For making viscose, the acid treatment step that is absolutely necessary also is that those of ordinary skills are known.Acid treatment can be carried out in bleaching machine, and acid-treated condition can be made appropriate change as the case may be, the kind of the acid of being adopted for example, time and temperature or the like.And these changes are also included within the scope of the present invention.

After manufacturing paper with pulp is impregnation steps, and it can carry out in treating tank, and the squeezing step of following is carried out in squeezer; Experiencedly in experienced drum, carry out.

Yellow is carried out in xanthating machine, and concrete technical conditions are: the carbon disulfide addition is to the 20-35% of the fine content of first, time 40-90 branch.Certainly, what those of ordinary skills should know is: above-mentioned condition can be carried out suitable adjustment, for example suitable raising temperature and reduce the time accordingly, and these changes are also included within the scope of the present invention.

The concrete technical conditions of spinning in spinning machine are as follows: sulfuric acid 110-130g/l, sodium sulphate 350-450g/l, zinc sulfate 8-16g/l; Temperature: 40-60 ℃.Certainly, those of ordinary skills should be appreciated that above-mentioned condition can carry out suitable adjustment, for example suitable raising temperature and corresponding minimizing time, and kind of the acid of being adopted etc. for example, and these changes are also included within the scope of the invention.

Be drawing-off, post processing (concise) and drying after this, these treatment steps technical conditions all be that those skilled in the art know.The performance of viscose of the present invention is as follows: do fracture strength: 〉=1.90CN/dtex; Wet breaking strength: 〉=0.90CN/dtex; Dried elongation at break: 〉=15.0%; Line density deviation ratio: ± 11.00%; Length variation rate: ± 9.0%; Overcut fibre :≤2.0%; Over-length fibre :≤20.0mg/100g; Residual sulfur content :≤28.0mg/100g; Fault≤25mg/100g.

Embodiment

Below in conjunction with specific embodiments the present invention is made a more detailed description, should be noted that, at these all embodiment that list only is illustrative, and does not mean that the scope of the invention is limited, and the present invention is limited by the scope of appended claims and equivalent thereof.

Embodiment 1

(1) boiling: alkali charge: in NaOH to oven dry stock amount 30%; Hydrogen peroxide consumption: with H ₂O ₂Count 1.0% of oven dry stock amount; Liquor ratio: 1: 2; Holding temperature: 160 ℃; Temperature retention time: 240 minutes.

(2) screening removes marrow: sieve aperture φ 1mm, advance to starch concentration 0.8%, and very starch concentration 0.6%, tailings concentration 1%.

(3) alkali extracting: the NaOH consumption is to oven dry stock amount 2%, 60 ℃ of extraction temperatures, 180 minutes time.

(4) yellow: the carbon disulfide consumption is 20% of an alkali cellulose weight, 90 minutes time.

(5) spinning: sulfuric acid: 110g/l, sodium sulphate: 450g/l, zinc sulfate: 16g/l, temperature: 60 ℃

(6) end product quality:

Do fracture strength: 1.95CN/dtex;

Wet breaking strength: 0.9CN/dtex;

Dried elongation at break: 15.1%;

Line density deviation ratio :+6%

Length variation rate :+8%

Overcut fibre: 1.8%;

Over-length fibre: 7.3mg/100g;

Residual sulfur content: 18.1mg/100g;

Fault: 25mg/100g

Do the strong coefficient of variation: 12.5%;

Whiteness: 70%;

Regain: 11.9%;

Embodiment 2

(1) boiling: alkali charge: in NaOH to oven dry stock amount 40%; Hydrogen peroxide consumption: with H ₂O ₂Count 0.6% of oven dry stock amount; Liquor ratio: 1: 3; Holding temperature: 140 ℃; Temperature retention time: 180 minutes.

(2) screening removes marrow: sieve aperture φ 2mm, advance to starch concentration 2%, and very starch concentration 1.5%, tailings concentration 2%.

(3) alkali extracting: the NaOH consumption is made with extra care 90 ℃ of temperature, 90 minutes time to oven dry stock amount 4%.

(4) yellow: the carbon disulfide consumption is 25% of an alkali cellulose weight, 70 minutes time.

(5) spinning: sulfuric acid: 120g/l, sodium sulphate: 380g/l, zinc sulfate: 10g/l, temperature: 54 ℃

(6) end product quality:

Do fracture strength: 2.0CN/dtex;

Wet breaking strength: 1.04CN/dtex;

Dried elongation at break: 16.3%;

Line density deviation ratio :-3.6%

Length variation rate :+6%

Overcut fibre: 1.8%;

Over-length fibre: 8.0mg/100g;

Residual sulfur content: 21mg/100g;

Fault: 25mg/100g

Do the strong coefficient of variation: 11.6%;

Whiteness: 71%

Regain: 12.3%;

Embodiment 3

(1) boiling: alkali charge: count oven dry stock amount 50% with NaOH; Hydrogen peroxide consumption: with H ₂O ₂Count 0.2% of oven dry stock amount; Liquor ratio: 1: 4; Holding temperature: 125 ℃; Temperature retention time: 120 minutes.

(2) screening removes marrow: sieve aperture φ 1.5mm, advance to starch concentration 1.5%, and very starch concentration 1.0%, tailings concentration 1.5%.

(3) alkali extracting: the NaOH consumption is to oven dry stock amount 3%, 75 ℃ of extraction temperatures, 130 minutes time.

(4) yellow: the carbon disulfide consumption is 35% of an alkali cellulose weight, 40 minutes time.

(5) spinning: sulfuric acid: 130g/l, sodium sulphate: 350g/l, zinc sulfate: 8g/l, temperature: 40 ℃

(6) end product quality:

Do fracture strength: 2.03CN/dtex;

Wet breaking strength: 0.97CN/dtex;

Dried elongation at break: 15.6%;

Line density deviation ratio :+2%

Length variation rate :+6.8%

Overcut fibre: 1.9%;

Over-length fibre: 11mg/100g;

Residual sulfur content: 20.2mg/100g;

Fault: 22.3mg/100g

Do the strong coefficient of variation: 14.1%;

Whiteness: 74%;

Regain: 11.3%;

Claims (6)

1, a kind of reed viscose is characterized in that: do fracture strength: 〉=1.90CN/dtex; Wet breaking strength: 〉=0.90CN/dtex; Dried elongation at break: 〉=15.0%; Line density deviation ratio: ± 11.00%; Length variation rate: ± 9.0%; Overcut fibre :≤2.0%; Over-length fibre :≤20.0mg/100g; Residual sulfur content :≤28.0mg/100g; Fault≤25mg/100g.

2, viscose according to claim 1 adopts big active alkali-hydrogen peroxide boiling in the preparation process, its conditions of cooking is as follows:

Alkali charge: in NaOH to oven dry stock amount 30-50%; Hydrogen peroxide consumption: with H ₂O ₂Count the 0.2-1.0% of oven dry stock amount; Liquor ratio: 1: 2-4; Holding temperature: 125-160 ℃; Temperature retention time: 120-240 minute.

3, viscose according to claim 1 and 2 is characterized in that utilizing ZSL after the boiling ₄Screen centrifuge removes marrow and handles, and its process conditions are: sieve aperture φ 1-2mm, advance to starch concentration 0.8-2%, and very starch concentration 0.6-1.5%, tailings concentration 1-2%.

4, according to each viscose of claim 1-3, it is characterized in that: carry out the thermokalite extracting before floating, process conditions are: temperature 60-90 ℃, and time 90-180 branch, alkali charge: the 2-4% that counts the oven dry stock amount with NaOH.

5, according to each viscose of claim 1-4, it is characterized in that: the yellow condition is: the carbon disulfide addition is the 20-35% of the fine content of first, and the yellow time is 40-90 minute.

6, a kind of method for preparing each described viscose of claim 1-5, comprise get the raw materials ready, step such as boiling, chlorination, alkali extracting, bleaching, acid treatment, yellow, spinning, it is characterized in that: adopt big active alkali-hydrogen peroxide cooking process when boiling, its conditions of cooking is as follows:

Alkali charge: in NaOH to oven dry stock amount 30-50%; Hydrogen peroxide consumption: with H ₂O ₂Count the 0.2-1.0% of oven dry stock amount; Liquor ratio: 1: 2-4; Holding temperature: 125-160 ℃; Temperature retention time: 120-240 minute.