CN102337688A - Mixed pulp used for producing viscose fiber and its production process - Google Patents
Mixed pulp used for producing viscose fiber and its production process Download PDFInfo
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- CN102337688A CN102337688A CN2011100715373A CN201110071537A CN102337688A CN 102337688 A CN102337688 A CN 102337688A CN 2011100715373 A CN2011100715373 A CN 2011100715373A CN 201110071537 A CN201110071537 A CN 201110071537A CN 102337688 A CN102337688 A CN 102337688A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 29
- 239000000835 fiber Substances 0.000 title claims abstract description 17
- 229920000297 Rayon Polymers 0.000 title claims abstract description 9
- 238000009835 boiling Methods 0.000 claims abstract description 44
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract description 39
- 229920000742 Cotton Polymers 0.000 claims abstract description 38
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000004061 bleaching Methods 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000010306 acid treatment Methods 0.000 claims abstract description 13
- 229910052742 iron Inorganic materials 0.000 claims abstract description 13
- 239000000428 dust Substances 0.000 claims abstract description 12
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 10
- 239000003513 alkali Substances 0.000 claims description 31
- 229920002472 Starch Polymers 0.000 claims description 28
- 239000008107 starch Substances 0.000 claims description 28
- 235000019698 starch Nutrition 0.000 claims description 28
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 25
- 238000005516 engineering process Methods 0.000 claims description 24
- 238000002156 mixing Methods 0.000 claims description 24
- 238000009874 alkali refining Methods 0.000 claims description 15
- 230000009257 reactivity Effects 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 8
- 230000000740 bleeding effect Effects 0.000 claims description 6
- 230000014759 maintenance of location Effects 0.000 claims description 6
- 238000004321 preservation Methods 0.000 claims description 6
- 238000009898 sodium hypochlorite bleaching Methods 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 4
- 235000007164 Oryza sativa Nutrition 0.000 claims description 4
- 235000009566 rice Nutrition 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 240000007594 Oryza sativa Species 0.000 claims 1
- 239000000126 substance Substances 0.000 abstract description 3
- 238000007380 fibre production Methods 0.000 abstract description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- 241000209094 Oryza Species 0.000 description 3
- 238000002386 leaching Methods 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 239000001913 cellulose Substances 0.000 description 2
- 230000029087 digestion Effects 0.000 description 2
- 229920005610 lignin Polymers 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000004753 textile Substances 0.000 description 2
- 208000019901 Anxiety disease Diseases 0.000 description 1
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 229920002488 Hemicellulose Polymers 0.000 description 1
- 244000082204 Phyllostachys viridis Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000036506 anxiety Effects 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 239000007844 bleaching agent Substances 0.000 description 1
- 210000000170 cell membrane Anatomy 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 150000002972 pentoses Chemical class 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
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Abstract
The invention discloses mixed pulp used for producing viscose fiber and its production process, which is characterized in that the mixed pulp is composed of bleached wood pulp and bleached cotton pulp according to weight ratio of 70: 90: 10-30, the process comprises the following steps: preparing materials, boiling, bleaching, performing acid-treatment, papermaking to obtain the mixed pulp. The polymerization degree of the mixed pulp is 500 DP-600 DP, alpha cellulose is greater than or equal to 94.5%, the ash content is less than or equal to 0.1%, iron is less than or equal to 18ppm, the reaction performance is less than or equal to 100s, the whiteness is 80%-85%, small dust is less than or equal to 140mg/cm<2>. The process of the invention is simple, the production has no pollution, so that practical problem of raw material shortage can be solved, the chemical fiber production cost is substantially reduced, and the product quality is enhanced.
Description
Technical field
The present invention relates to a kind of textile industry raw material pulp, specifically a kind of mixing pulp and production technology that is used to produce viscose, particularly relate to a kind of utilize that bleached wood pulp and bleached cotton starch produce mix pulp and production technology.
Background technology
At present, the raw material pulp as textile industry generally has the cotton pulp dregs of rice, bamboo pulp, wood pulps etc., and its key technical indexes exists one to be first fibre low (88 ﹪～92 ﹪); The 2nd, ash high (>=0.2 ﹪); The 3rd, the iron content weight (>=30ppm); The 4th, reactivity worth instability and time long (more than the 200s), and also difficult control on cost.This four big difficult point of pulp has brought a series of technology obstacles such as dyeing difficulty, production time elongation for chemical fibre manufacturer.
Summary of the invention
The purpose of this invention is to provide a kind of mixing pulp and production technology that is used to produce viscose, this mixing pulp utilizes bleached wood pulp and bleached cotton starch production, and its leading indicator of mixing pulp is that the degree of polymerization is 500DP-600DP; First fibre>=94.5 ﹪; Ash≤0.1 ﹪, iron≤18ppm, reactivity worth≤100s; Whiteness 80 ﹪-85 ﹪, little dust≤140 ㎎/㎝
2
The present invention adopts following technical scheme to realize its goal of the invention, a kind of mixing pulp that is used to produce viscose, by weight; It is bleached wood pulp: bleached cotton starch=70～90:10～30 are prepared from through boiling, bleaching, acid treatment, after manufacturing paper with pulp, and the degree of polymerization of said mixing pulp is 500DP～600DP, first fibre>=94.5 ﹪; Ash≤0.1 ﹪, iron≤18ppm, reactivity worth≤100s; Whiteness 80 ﹪～85 ﹪, little dust≤140 ㎎/㎝
2
The present invention by weight, the ratio of greater inequality of bleached wood pulp and bleached cotton starch is 90:10.
A kind of production method of above-mentioned mixing pulp, it comprises the following steps:
⑴ get the raw materials ready: by proportioning that bleached wood pulp is even through the shredding of paging pulverizer, through cyclone separator with spray alkali lye and mix and fall into conveying worm and send into rotary spherical digester; By proportioning that bleached cotton starch is even through the opener shredding, through cyclone separator with spray alkali lye and mix and fall into conveying worm and send into rotary spherical digester;
⑵ boiling: bleached wood pulp adopts the two step boilings of prehydrolysis soda processes, and boiling for the first time is a boiled process, and by weight, the liquor ratio of bleached wood pulp and water is 1:3.5 to 1:4.0; Heated up 40 minutes for the first time, pressure is from 0.00Mpa～0.50Mpa, 30 ℃～140 ℃ of temperature, and pressure carries out little steam bleeding during to 0.50Mpa; Deflation time 20 minutes, steam bleeding pressure carries out heating up 30 minutes time to 0.20Mpa second time; Intensification pressure is from 0.20Mpa～0.60Mpa, and 140 ℃～160 ℃ of temperature are incubated 120 minutes; Pressure during insulation is 0.60Mpa, and holding temperature is 160 ℃, carries out soda boiling technology behind the poach; Bleached cotton starch adopts soda processes soda boiling technology;
⑶ bleaching: to bleached wood pulp, carry out alkali refining earlier, alkali refining alkalinity 0.7g/l～0.8g/l, 90 ℃ of alkali refining temperature, 90 minutes alkali refining time, the residual alkali of washing adopts sodium hypochlorite bleaching technology then behind the alkali refining to 0.05g/l; Bleached cotton starch is adopted sodium hypochlorite bleaching technology;
⑷ acid treatment: adopt hydrochloric acid to carry out acid treatment to bleached wood pulp, bleached cotton starch;
⑸ manufacture paper with pulp: the wood pulps after the acid treatment, the cotton pulp dregs of rice are mixed in the pond of manufacturing paper with pulp by proportioning, after propeller stirs 15 minutes-20 minutes, send into the pulp machine finished product of manufacturing paper with pulp out.
The present invention is in step ⑵, and the soda boiling technology of said bleached wood pulp is for by weight, and alkali charge is 4 ﹪～6 ﹪ of bleached wood pulp; Digesting assistant 0.3 ﹪, the soda boiling liquor ratio is 1:3.2 to 1:4.0, dense 15.1 g/l of goal alkali～16.1g/l; 80 ℃～90 ℃ of alkali temperature; Heat preservation pressure 0.60 Mpa～0.65Mpa, temperature retention time 115 minutes～125 minutes, viscosity 9.5mpa.s～10.5mpa.s after the boiling.
The present invention is in step ⑵, and the soda boiling technology of said bleached cotton starch is for by weight, and alkali charge is 16.5 ﹪～18.5 ﹪ of cotton linter; Digesting assistant 0.3 ﹪, soda boiling liquor ratio 1:3.2 to 1:4.2, dense 50 g/l of goal alkali～52g/l; 90 ℃～100 ℃ of alkali temperature; Heat preservation pressure 0.65 Mpa～0.74Mpa, temperature retention time 130 minutes～140 minutes, viscosity 8.8mpa.s～9.5mpa.s after the boiling.
The present invention is in step ⑵, and the bottom steam admission mode is adopted in the admission of rotary spherical digester during boiling.
Because adopt technique scheme, the present invention has realized goal of the invention preferably, its technology is simple, produces pollution-freely, has solved the practical difficulty of raw material anxieties, greatly reduce the chemical fibre production cost, has improved the quality of product.
The specific embodiment
Below in conjunction with embodiment the present invention is described further.
Embodiment 1:
A kind of mixing pulp that is used to produce viscose, by weight, it is bleached wood pulp: bleached cotton starch=70～90:10～30 (present embodiment is 70:30) is prepared from through boiling, bleaching, acid treatment, after manufacturing paper with pulp; The degree of polymerization of said mixing pulp is 500DP～600DP, first fibre>=94.5 ﹪, ash≤0.1 ﹪; Iron≤18ppm; Reactivity worth≤100s, whiteness 80 ﹪～85 ﹪, little dust≤140 ㎎/㎝
2
Said bleached wood pulp is a bleaching needle-point leaf pulp, and its degree of polymerization is 950DP～1050DP, first fibre>=87.5 ﹪, ash≤0.1 ﹪, iron≤20ppm, viscosity 25 mpa.s～30 mpa.s, whiteness 88 ﹪～90 ﹪, little dust≤100 ㎎/㎝
2Present embodiment is that the degree of polymerization is 950DP, first fibre=88.5 ﹪, ash=0.1 ﹪, iron=20ppm, viscosity 25 mpa.s, whiteness 88 ﹪, little dust=100 ㎎/㎝
2
Said bleached cotton starch is the bleached cotton starch by the cotton linter preparation, its cotton linter short flannel maturity>=30%, sulfuric acid insoluble matter≤14%, ash≤2.2%, moisture≤10%.Bleached cotton starch first fibre>=95.0 ﹪ of preparation, ash≤0.1 ﹪, iron≤20ppm, viscosity 9.5 mpa.s～10.5 mpa.s, whiteness 81 ﹪, little dust≤140 ㎎/㎝
2
A kind of production method of mixing pulp as stated, it comprises the following steps:
⑴ get the raw materials ready: by proportioning that bleached wood pulp is even through the shredding of paging pulverizer, through cyclone separator with spray alkali lye and mix and fall into conveying worm and send into rotary spherical digester; By proportioning that bleached cotton starch is even through the opener shredding, through cyclone separator with spray alkali lye and mix and fall into conveying worm and send into rotary spherical digester;
⑵ boiling:, improve the purity of pulp for removing or reducing the non-cellulosic impurity content (like hemicellulose, lignin, pentosan etc.) in the bleached wood pulp; Weaken simultaneously connection between alkali resistant pentosan and cellulose, the structure of loose cell membrane is destroyed fibrocellular primary wall, and the secondary wall of rich cellulose is come out, for the reactivity worth that improves pulp creates conditions.Bleached wood pulp adopts the two step boilings of prehydrolysis soda processes, and boiling for the first time is a boiled process, by weight; The liquor ratio of bleached wood pulp and water is 1:3.5 to 1:4.0 (present embodiment is 1:3.8), heats up 40 minutes for the first time, and pressure is from 0.00Mpa～0.50Mpa (present embodiment is 0.50Mpa); 30 ℃～140 ℃ of temperature (present embodiment is 140 ℃), pressure are carried out little steam bleeding, deflation time 20 minutes during to 0.50Mpa; Steam bleeding pressure carries out heating up the second time to 0.20Mpa, and 30 minutes time, intensification pressure is from 0.20Mpa～0.60Mpa (present embodiment is 0.60Mpa); 140 ℃～160 ℃ of temperature (present embodiment is 160 ℃); Be incubated 120 minutes, the pressure during insulation is 0.60Mpa, and holding temperature is 160 ℃.
Carry out soda processes soda boiling technology behind the poach: its soda boiling technology is for by weight; Alkali charge is 4 ﹪～6 ﹪ (present embodiment is 5 ﹪) of bleached wood pulp; Digesting assistant 0.3 ﹪, the soda boiling liquor ratio is 1:3.2 to 1:4.0 (present embodiment is 1:3.5), dense 15.1 g/l of goal alkali～16.1g/l (present embodiment is 15.5g/l); 80 ℃～90 ℃ of alkali temperature (present embodiment is 90 ℃); Heat preservation pressure 0.60 Mpa～0.65Mpa (present embodiment is 0.64Mpa), temperature retention time 115 minutes～125 minutes (present embodiment is 120 minutes), viscosity 9.5mpa.s～10.5mpa.s after the boiling (present embodiment is 9.8mpa.s).
Bleached cotton starch also adopts soda processes soda boiling technology: its soda boiling technology is for by weight; Alkali charge is 16.5 ﹪～18.5 ﹪ (present embodiment is 17.5 ﹪) of cotton linter; Digesting assistant 0.3 ﹪, soda boiling liquor ratio 1:3.2 to 1:4.2 (present embodiment is 1:3.4), dense 50 g/l of goal alkali～52g/l (present embodiment is 51g/l); 90 ℃～100 ℃ of alkali temperature (present embodiment is 100 ℃); Heat preservation pressure 0.65 Mpa～0.74Mpa (present embodiment is 0.72Mpa), temperature retention time 130 minutes～140 minutes (present embodiment is 130 minutes), viscosity 8.8mpa.s～9.5mpa.s after the boiling (present embodiment is 9.3mpa.s).
Described digesting assistant is the patent No. 200810233199.7, December 3 2008 applying date, disclosed a kind of cotton pulp steam boiling additive.
During boiling; Existing steam admission mode is " one " word pipe middle part of rotary spherical digester (promptly) admission; This admission drawback is: when boiling behind certain hour, raw material in the rotary spherical digester shrink, the rotary spherical digester internal upper part divides promptly 1/3 to be empty; At this moment raw material can not evenly receive vapour and all receive vapour, cause the first fibre not high long with digestion time.
The present invention is in step ⑵, and the bottom steam admission mode is all adopted in the admission of rotary spherical digester during boiling, and its steam is come in the bottom of rotary spherical digester all the time, is penetrated into from the bottom to top in the raw material, and admission is even, can effectively keep the fine content of first and the shortening of digestion time.
⑶ bleaching: for further removing lignin and the pentose in the boiling disposed slurry, improve the purity and the respond of pulp, bleached wood pulp is carried out alkali refining earlier; Alkali refining alkalinity 0.7g/l; 90 ℃ of alkali refining temperature, 90 minutes alkali refining time, the residual alkali of washing is to 0.05g/l behind the alkali refining; Adopt conventional sodium hypochlorite bleaching technology then, bleaching temperature: 45 ℃, bleach chloride 0.30g/l, bleaching contains alkali: 0.09g/l, and bleaching time 60 minutes is below the chloride 0.05g/l of bleaching terminal point.
Bleached cotton starch is adopted conventional sodium hypochlorite bleaching, advance to starch chloride: 0.10 g/l, advance slurry and contain alkali 0.05 g/l, 45 ℃ of bleaching temperatures are bleached chloride 0.35 g/l, and bleaching contains alkali 0.10g/l, and bleaching time 80 minutes is below the chloride 0.10g/l of bleaching terminal point.
⑷ acid treatment: the acid treatment process of bleached cotton starch and bleached wood pulp is identical, is specially: vexed sour acid content 1.0g/l, vexed 40 minutes time of acid, 45 ℃ of vexed sour temperature.
⑸ manufacture paper with pulp: the wood pulps after the acid treatment, the cotton pulp dregs of rice are mixed in the pond of manufacturing paper with pulp by proportioning, stir through propeller and sent into the pulp machine finished product of manufacturing paper with pulp out in 15 minutes-20 minutes after (present embodiment is 20 minutes).Its degree of polymerization of mixing pulp is 550DP, first fibre=95.5 ﹪, ash=0.1 ﹪, iron=15ppm, reactivity worth=95s, whiteness 81 ﹪, little dust=130 ㎎/㎝
2
Embodiment 2:
In step ⑴, bleached wood pulp: bleached cotton starch=90:10, the degree of polymerization of the mixing pulp of preparation is 520DP, first fibre=94.5 ﹪, ash=0.1 ﹪, iron=15ppm, reactivity worth=80s, whiteness 82 ﹪, little dust=120 ㎎/㎝
2Surplus with embodiment 1.
Embodiment 3:
Bleached wood pulp: bleached cotton starch=80:20, the degree of polymerization of the mixing pulp of preparation is 560DP, first fibre=94.5 ﹪, ash=0.10 ﹪, iron=18ppm, reactivity worth=95 s, whiteness 81 ﹪, little dust=140 ㎎/㎝
2Surplus with embodiment 1.
Embodiment 4:
Bleached wood pulp: bleached cotton starch=95:5, the degree of polymerization of the mixing pulp of preparation is 500DP, first fibre=93.0 ﹪, ash=0.10 ﹪, iron=20ppm, reactivity worth＞100 s, whiteness 81 ﹪, little dust=140 ㎎/㎝
2Surplus with embodiment 1.
We can find out through above 4 embodiment; Mix pulp along with the increase of wood pulp proportioning and the variation of process conditions, quality index is also changing, and the wood pulp proportioning surpasses 90%; The mixing pulp reactivity worth of producing can not through and the first fibre on the low side; And proportioning all can reach quality standards but production cost can rise 80% o'clock each item index, so best proportioning is 9:1, the mixing pulp of producing can reach quality requirement makes production cost be controlled at zone of reasonableness again.
Claims (6)
1. a mixing pulp that is used to produce viscose is characterized in that by weight, and it is bleached wood pulp: bleached cotton starch=70～90:10～30 are prepared from through boiling, bleaching, acid treatment, after manufacturing paper with pulp; The degree of polymerization of said mixing pulp is 500DP～600DP, first fibre>=94.5 ﹪, ash≤0.1 ﹪; Iron≤18ppm; Reactivity worth≤100s, whiteness 80 ﹪～85 ﹪, little dust≤140 ㎎/㎝
2
2. according to the said mixing pulp that is used to produce viscose of claim 1, it is characterized in that by weight that bleached wood pulp is 90:10 with the ratio of bleached cotton starch.
3. a production method of mixing pulp according to claim 1 or claim 2 is characterized in that it comprises the following steps:
⑴ get the raw materials ready: by proportioning that bleached wood pulp is even through the shredding of paging pulverizer, through cyclone separator with spray alkali lye and mix and fall into conveying worm and send into rotary spherical digester; By proportioning that bleached cotton starch is even through the opener shredding, through cyclone separator with spray alkali lye and mix and fall into conveying worm and send into rotary spherical digester;
⑵ boiling: bleached wood pulp adopts the two step boilings of prehydrolysis soda processes, and boiling for the first time is a boiled process, and by weight, the liquor ratio of bleached wood pulp and water is 1:3.5 to 1:4.0; Heated up 40 minutes for the first time, pressure is from 0.00Mpa～0.50Mpa, 30 ℃～140 ℃ of temperature, and pressure carries out little steam bleeding during to 0.50Mpa; Deflation time 20 minutes, steam bleeding pressure carries out heating up 30 minutes time to 0.20Mpa second time; Intensification pressure is from 0.20Mpa～0.60Mpa, and 140 ℃～160 ℃ of temperature are incubated 120 minutes; Pressure during insulation is 0.60Mpa, and holding temperature is 160 ℃, carries out soda boiling technology behind the poach; Bleached cotton starch adopts soda processes soda boiling technology;
⑶ bleaching: to bleached wood pulp, carry out alkali refining earlier, alkali refining alkalinity 0.7g/l～0.8g/l, 90 ℃ of alkali refining temperature, 90 minutes alkali refining time, the residual alkali of washing adopts sodium hypochlorite bleaching technology then behind the alkali refining to 0.05g/l; Bleached cotton starch is adopted sodium hypochlorite bleaching technology;
⑷ acid treatment: adopt hydrochloric acid to carry out acid treatment to bleached wood pulp, bleached cotton starch;
⑸ manufacture paper with pulp: the wood pulps after the acid treatment, the cotton pulp dregs of rice are mixed in the pond of manufacturing paper with pulp by proportioning, after propeller stirs 15 minutes-20 minutes, send into the pulp machine finished product of manufacturing paper with pulp out.
4. according to the production method of the said mixing pulp of claim 3, it is characterized in that in step ⑵ that the soda boiling technology of said bleached wood pulp is for by weight; Alkali charge is 4 ﹪～6 ﹪ of bleached wood pulp, digesting assistant 0.3 ﹪, and the soda boiling liquor ratio is 1:3.2 to 1:4.0; Dense 15.1 g/l of goal alkali～16.1g/l, 80 ℃～90 ℃ of alkali temperature, heat preservation pressure 0.60 Mpa～0.65Mpa; Temperature retention time 115 minutes～125 minutes, viscosity 9.5mpa.s～10.5mpa.s after the boiling.
5. according to the production method of the said mixing pulp of claim 3, it is characterized in that in step ⑵ that the soda boiling technology of said bleached cotton starch is for by weight; Alkali charge is 16.5 ﹪～18.5 ﹪ of cotton linter, digesting assistant 0.3 ﹪, soda boiling liquor ratio 1:3.2 to 1:4.2; Dense 50 g/l of goal alkali～52g/l, 90 ℃～100 ℃ of alkali temperature, heat preservation pressure 0.65 Mpa～0.74Mpa; Temperature retention time 130 minutes～140 minutes, viscosity 8.8mpa.s～9.5mpa.s after the boiling.
6. according to the production method of the said mixing pulp of claim 3, it is characterized in that in step ⑵ that the bottom steam admission mode is adopted in the admission of rotary spherical digester during boiling.
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| CN116289284A (en) * | 2023-04-11 | 2023-06-23 | 安徽雪龙纤维科技股份有限公司 | Preparation method of biodegradable nanocellulose cotton pulp |
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| CN109778580A (en) * | 2019-01-31 | 2019-05-21 | 山东银鹰股份有限公司 | A kind of preparation method of high intensity filter paper Cotton Pulp |
| CN109778580B (en) * | 2019-01-31 | 2022-01-21 | 山东银鹰股份有限公司 | Preparation method of cotton pulp for high-strength filter paper |
| CN116289284A (en) * | 2023-04-11 | 2023-06-23 | 安徽雪龙纤维科技股份有限公司 | Preparation method of biodegradable nanocellulose cotton pulp |
| CN116289284B (en) * | 2023-04-11 | 2024-04-30 | 安徽雪龙新材料(集团)有限公司 | Preparation method of biodegradable nanocellulose cotton pulp |
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