CN101280466A - Hemp dissolving pulp for chemical fabrics and production method thereof - Google Patents
Hemp dissolving pulp for chemical fabrics and production method thereof Download PDFInfo
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- CN101280466A CN101280466A CNA2008100158132A CN200810015813A CN101280466A CN 101280466 A CN101280466 A CN 101280466A CN A2008100158132 A CNA2008100158132 A CN A2008100158132A CN 200810015813 A CN200810015813 A CN 200810015813A CN 101280466 A CN101280466 A CN 101280466A
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- 244000025254 Cannabis sativa Species 0.000 title claims abstract description 31
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 title claims abstract description 31
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 title claims abstract description 31
- 235000009120 camo Nutrition 0.000 title claims abstract description 31
- 235000005607 chanvre indien Nutrition 0.000 title claims abstract description 31
- 239000011487 hemp Substances 0.000 title claims abstract description 31
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 229920000875 Dissolving pulp Polymers 0.000 title claims description 24
- 239000000126 substance Substances 0.000 title claims description 11
- 239000004744 fabric Substances 0.000 title claims description 10
- 239000000463 material Substances 0.000 claims abstract description 67
- 239000002994 raw material Substances 0.000 claims abstract description 41
- 238000004061 bleaching Methods 0.000 claims abstract description 31
- 239000000835 fiber Substances 0.000 claims abstract description 23
- 238000010009 beating Methods 0.000 claims abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 24
- 238000009835 boiling Methods 0.000 claims description 24
- 239000003513 alkali Substances 0.000 claims description 21
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 20
- 239000000460 chlorine Substances 0.000 claims description 20
- 229910052801 chlorine Inorganic materials 0.000 claims description 20
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- 238000010411 cooking Methods 0.000 claims description 17
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 14
- 230000000740 bleeding effect Effects 0.000 claims description 12
- 239000000428 dust Substances 0.000 claims description 12
- 229910052742 iron Inorganic materials 0.000 claims description 12
- 239000012141 concentrate Substances 0.000 claims description 7
- 238000009898 sodium hypochlorite bleaching Methods 0.000 claims description 7
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 6
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 239000002585 base Substances 0.000 claims description 6
- 230000014759 maintenance of location Effects 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 230000009257 reactivity Effects 0.000 claims description 6
- 239000002655 kraft paper Substances 0.000 claims description 4
- 239000000123 paper Substances 0.000 claims description 4
- 229920000297 Rayon Polymers 0.000 abstract description 15
- 238000000034 method Methods 0.000 abstract description 12
- 238000005406 washing Methods 0.000 abstract description 6
- 238000010306 acid treatment Methods 0.000 abstract description 4
- 238000004140 cleaning Methods 0.000 abstract 2
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 abstract 2
- 238000002360 preparation method Methods 0.000 abstract 1
- 239000002002 slurry Substances 0.000 description 16
- 238000006116 polymerization reaction Methods 0.000 description 8
- 241000196324 Embryophyta Species 0.000 description 7
- 239000012535 impurity Substances 0.000 description 6
- 229920000742 Cotton Polymers 0.000 description 4
- 239000004753 textile Substances 0.000 description 4
- 240000000491 Corchorus aestuans Species 0.000 description 3
- 235000011777 Corchorus aestuans Nutrition 0.000 description 3
- 235000010862 Corchorus capsularis Nutrition 0.000 description 3
- 239000002562 thickening agent Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 238000005660 chlorination reaction Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 240000008564 Boehmeria nivea Species 0.000 description 1
- 241000222122 Candida albicans Species 0.000 description 1
- 241001343274 Dichrostachys spicata Species 0.000 description 1
- 241000588724 Escherichia coli Species 0.000 description 1
- 241000218231 Moraceae Species 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 208000003251 Pruritus Diseases 0.000 description 1
- 241000589517 Pseudomonas aeruginosa Species 0.000 description 1
- 241000191967 Staphylococcus aureus Species 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000003905 agrochemical Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007844 bleaching agent Substances 0.000 description 1
- 229940095731 candida albicans Drugs 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000003843 chloralkali process Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007380 fibre production Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 230000007803 itching Effects 0.000 description 1
- 230000002147 killing effect Effects 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000002964 rayon Substances 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000009955 starching Methods 0.000 description 1
- 210000004243 sweat Anatomy 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Abstract
The invention discloses a hemp pulp produced with the use of hemp materials and the techniques of the production. In order to make use of the hemp materials that is the raw materials to produce the hemp pulp, the steps for the production of hemp pulp include feed preparation, stewing, feed washing, beating, the first cleaning de-sanding, concentrating, chlor-alkalization, hypochlorite bleaching, acid treatment, washing, the second cleaning de-sanding, concentrating, paper making process and so on. With the invention, the hemp material can be taken as the raw material to facilitate the production of high quality hemp pulp with excellent performance. Therefore, the current issue of the shortage of viscose fiber raw material can be resolved.
Description
Technical field
The present invention relates to the chemical fibre production technical field, especially relate to a kind of hemp dissolving pulp for chemical fabrics and production method thereof of utilizing numb material to produce.
Background technology
Viscose is as a kind of textile raw material; owing to have characteristics such as quality is slim and graceful, smooth, soft, comfortable; be well received by consumers; its traditional production method is to adopt cotton linter, needlebush, leaf wood etc. to produce for raw material; but current minimizing along with sown areas of cotton; reach country the forest conservation policy implementation is got more and more strictness, viscose glue raw material cotton linter, timber problem of shortage highlight just year by year.
The fiber crops material is commonly called as " fire fiber crops ", is the annual herb plant of Moraceae, male and female plant division.The original producton location is at the middle part, Asia.The fiber crops assortment is planted easy, and growth is rapid, and adaptability is strong, the general high 2-3 rice of stem, and 1 year one receipts, it does not use any agricultural chemicals in plantation and growth course, be a kind of green product.Filamentary fineness is 1/3rd of a ramie in the fiber crops material plant, approaches cotton fiber, and fiber ends is blunt round, and therefore the textiles that adopts numb material fibrous woven to form is soft fit, need not special the processing and just can avoid its prodding and itching feeling and coarse hard sense.And numb material fiber not only especially jewelry, expensive clothing and other valuables but also fibrillar center bigger cavity is arranged, link to each other with small holes with many cracks that fiber surface is vertically distributing, so its excellent capillarity makes numb material fiber absorbing sweat hydrofuge performance bins outer good.And the cross section of numb material fiber is the sealene triangle of hollow, polygon, oval type etc., its molecular structure is many ribs shape, and is looser, and spiral is arranged, therefore numb material fibre has good dissipation role to sound wave, light wave, and the ultraviolet ray in its maskable external world is to the injury of human body.The hygroscopicity of fiber crops material fiber is also good especially, and regain can reach about 12%, and its goods can be avoided electrostatic accumulation easily, has avoided the discharge and the pilling effect that cause because of clothing swing friction.And numb material fiber has good heat resistance, so the relatively suitable Work Clothes of makeing sun-proof clothes, parasol and various special requirements of numb material textile product and interior decoration cloth etc.And numb material fiber also has the anti-mildew bacteria resistance function, and numb material textiles all has tangible killing action to staphylococcus aureus, Pseudomonas aeruginosa, Escherichia coli, Candida albicans etc.Therefore adopting numb material plant is that people solve viscose glue a kind of valid approach that there is lack of raw materials for the raw material production viscose, but current people are with the numb material plant method and few that is the raw material production viscose, and adopt current existence some to utilize on the performances such as whiteness, intensity and elongate fiber of the viscose that numb material plant produces for the process of raw material production viscose all be not unusual ideal; And its technology is also comparatively complicated, and the supplies consumption in the production is bigger, and this has influenced the utilization of people to numb material plant, has also influenced the production and the quality of viscose to a certain extent.
Technical problem to be solved by this invention has provided a kind of hemp dissolving pulp and technology thereof of utilizing numb material to produce, by the method among the present invention can be that raw material is produced the high-quality hemp dissolving pulp with premium properties easily with numb material, has solved the current viscose problem that there is lack of raw materials.
A kind of method that adopts numb material to prepare hemp dissolving pulp of the present invention, for adopting numb material is that raw material is made hemp dissolving pulp, comprise get the raw materials ready, boiling, wash material, making beating, preceding selected desanding, concentrate, steps such as chlor-alkaliization, bleaching, acid treatment, washing, the selected desanding in back, the operation that concentrates, manufactures paper with pulp; When getting the raw materials ready, with the numb material raw material process preliminary treatment after the screening, remove numb material exocuticle, and numb material is cut into the long segment of 3～5cm, clean removal of impurities then, make its sulfuric acid insoluble matter≤9.5%, ash content≤3.00%, iron branch≤300mg/kg, kraft cooking is adopted in boiling, and alkali using rate is counted 10～30% of oven dry stock amount with NaOH, cooking liquor sulphidity 10～40%, the green oxygen of digesting assistant is 0.01～1% of oven dry stock amount, and the digesting assistant dodecyl sodium sulfate is 0.01～3% of an oven dry stock amount, prepares burden under 1: 2～1: 4.5 the situation of liquor ratio and carry out boiling in rotary spherical digester; When boiling, adopt temperature-gradient method, the rotary spherical digester cold commentaries on classics earlier that is placed with numb material raw material and prepares cooking liquor after 10～20 minutes, is fed steam and carries out boiling in rotary spherical digester, 20 ± 5 minutes heating-up time, pressure 0.30 ± 0.03Mpa, 10 ± 2 minutes once little steam bleeding time, overbottom pressure is a normal pressure in the rotary spherical digester; 30 ± 5 minutes secondary temperature elevation time, pressure 0.50 ± 0.03Mpa, 15 ± 2 minutes little steam bleeding time of secondary, overbottom pressure 0.30 ± 0.03Mpa in the rotary spherical digester, three 25 ± 5 minutes heating-up times, pressure 0.55～0.78Mpa, 161 ± 20 ℃ of temperature, temperature retention time 80～300 minutes.Afterwards, jute pulp after the boiling is washed material, remove in the slurry Zheng Zhu ?liquid, and the processing of pulling an oar, make the fiber in the slurry reduce length, vertically division simultaneously, and effectively abolish cortex in the slurry etc., impurity and the slurry group of containing in the slurry removed in selected desanding before carrying out then, concentrate meeting technological requirement by thickener, thickener outlet slurry is dense 3～4%, certainly, those skilled in the art can carry out suitable adjustment to it according to the needs of producing, and are beneficial to the carrying out that produces.Afterwards, whiteness in order to ensure hemp dissolving pulp, should bleach it, use chlor-alkaliization to add the method for bleaching of clorox, effectively remove residual lignin and foreign pigment in the slurry, jute pulp after concentrating is carried out chlor-alkali processing and bleaching processing, can be at the chlorination tower, carry out in alkalization tower and the bleaching machine, can adopt in the chlorination tower during chlor-alkali and pass to chlorine, making chlorine dosage is 0.1%～2.3% of oven dry stock amount, the residual chlorine 0.02～0.9g/L in alkalization back, the residual alkali 10～100mg/L in alkalization back can be according to the needs of producing in carrying out the chlor-alkali process, the time of control chlor-alkaliization, and the pH value when adjusting reaction, to guarantee normally carrying out of chlor-alkaliization, these all are general knowledge as well known to those skilled in the art; Sodium hypochlorite bleaching is then adopted in bleaching, and bleaching contains alkali 10～150mg/L, residual chlorine dose 0.1～0.5g/L, and it is 45～65 ℃ according to the needs control temperature of producing, bleaching time 20～100 minutes, the consumption of adjustment clorox, these also are general knowledge as well known to those skilled in the art.Bleaching finishes, the mode of production according to current conventional pulp adopts hydrochloric acid or sulfuric acid or sulfurous acid to carry out acid treatment, also washing, the selected desanding in back, and the jute pulp after will washing is 3.0～6.0% through the thickener processing to starching dense, send pulp machine to manufacture paper with pulp then, obtain being used to produce the hemp dissolving pulp of viscose, the hemp dissolving pulp quality height that obtains, function admirable, the hemp dissolving pulp performance indications are: alpha cellulose 〉=92%; Ash content≤0.10%; Iron branch≤25mg/kg; Viscosity 10.5 ± 1.0mpas; Whiteness 〉=81%; Inhale base number 〉=500%; Reactivity worth≤250s; Moisture 10.5 ± 1.0%; Little dust≤240mm
2/ kg; Big dust≤1.0/kg; Quantitative 700 ± 100g/m
2And number of times and exhaust situation that boiling in the present invention can be adjusted temperature-gradient method according to the needs of producing can adopt chlorine to carry out when bleaching.
Among the present invention, used chemical industry material is used material in the current viscose production in each operation, all can obtain from market; And the equipment of using in each operation all adopts used conventional equipment in the current viscose production, there is no special feature.
The inventive method prepares hemp dissolving pulp, adopts kraft cooking, and conditions of cooking mode, conditions of bleaching are improved, and the hemp dissolving pulp quality index that obtains by the method is more excellent than the quality index of conventional short rayon fiber Wesy pulp, the slurry yield height.Realized that people utilize numb material to produce the purpose of hemp dissolving pulp, have alleviated the problem of viscose shortage of raw materials.
The specific embodiment
Embodiment one
To adopt numb material be raw material through getting the raw materials ready, boiling, wash material, making beating, preceding selected desanding, concentrate, steps such as chlor-alkaliization, sodium hypochlorite bleaching, acid treatment, washing, the selected desanding in back, the operation operation that concentrates, manufactures paper with pulp produce hemp dissolving pulp, wherein:
Get the raw materials ready: numb material raw material is carried out preliminary treatment, remove numb material exocuticle, and numb material is cut into the long segment of 4～5cm, wash to wait and handle also removal of impurities, the quality index of numb material raw material is a sulfuric acid insoluble matter 9.5%, and ash content 3.00%, iron divide 300mg/kg;
The boiling materials: alkali using rate is counted 10% of oven dry stock amount with NaOH, cooking liquor sulphidity 10%, and the green oxygen of digesting assistant is 0.01% of oven dry stock amount, digesting assistant dodecyl sodium sulfate consumption is 0.8% of an oven dry stock amount, liquor ratio 1: 2.0.
Boiling: will be placed with numb material raw material and the rotary spherical digester for preparing cooking liquor cold commentaries on classics earlier 10 minutes, and lead to steam to rotary spherical digester and heat up 25 minutes heating-up time, pressure 0.30 ± 0.03Mpa, 9 minutes once little steam bleeding time, overbottom pressure is a normal pressure in the rotary spherical digester, 25 minutes secondary temperature elevation time, pressure 0.50 ± 0.03Mpa, the 15 minutes little steam bleeding time of secondary, overbottom pressure is 0.30 ± 0.03Mpa in the rotary spherical digester, three 30 minutes heating-up times, pressure 0.75～0.78Mpa, 180 ℃ of temperature, temperature retention time 280 minutes.Boiling slurry quality: the degree of polymerization 570, first fibre 95.2%.
Chlor-alkaliization: chlorine dosage is 0.1% of an oven dry stock, the residual chlorine 0.09g/L in alkalization back, the residual alkali 80mg/L in alkalization back.
Bleaching: adopt sodium hypochlorite bleaching, bleaching contains alkali 60mg/L, residual chlorine dose 0.3mg/L, and the control bleaching temperature is 50 ℃, bleaching time 50 minutes.
Finished product slurry quality: alpha cellulose 94.5%; Whiteness 82%; The fine degree of polymerization 503 of first; Ash content 0.08%; Iron divides 23mg/kg; Viscosity 10.5 ± 0.5mpas; Inhale base number 520%; Reactivity worth 225s; Moisture 10.5 ± 0.5%; Little dust 232mm
2/ kg; Big 0.8/kg of dust; Quantitative 700 ± 20g/m
2
Embodiment two
Production stage is with embodiment one, wherein
Get the raw materials ready: numb material raw material is carried out preliminary treatment, remove numb material exocuticle, and numb material is cut into the long segment of 3～4cm, wash to wait and handle also removal of impurities, the quality index of numb material raw material is sulfuric acid insoluble matter≤8.5%, ash content≤2.80%, iron branch≤280mg/kg;
The boiling materials: alkali using rate is 15% of oven dry stock amount in NaOH, cooking liquor sulphidity 20%, and the green oxygen of digesting assistant is 0.05% of oven dry stock amount, digesting assistant dodecyl sodium sulfate consumption is 1.0% of an oven dry stock amount, liquor ratio 1: 3.
Boiling: will be placed with numb material raw material and the rotary spherical digester for preparing cooking liquor cold commentaries on classics earlier 15 minutes, leading to steam to rotary spherical digester heats up, 20 minutes heating-up time, pressure 0.30 ± 0.03Mpa, 10 minutes once little steam bleeding time, overbottom pressure is a normal pressure in the rotary spherical digester, 30 minutes secondary temperature elevation time, pressure 0.50 ± 0.03Mpa, the 17 minutes little steam bleeding time of secondary, overbottom pressure is 0.30 ± 0.03Mpa in the rotary spherical digester, three 25 minutes heating-up times, pressure 0.65～0.70Mpa, 145 ℃ of temperature, temperature retention time 180 minutes, boiling slurry quality: the degree of polymerization 550, first fibre 95.5%.
Chlor-alkaliization: chlorine dosage is 0.6% of an oven dry stock, the residual chlorine 0.6g/L in alkalization back, the residual alkali 50mg/L in alkalization back.
Bleaching: adopt sodium hypochlorite bleaching, bleaching contains alkali 50mg/L, residual chlorine dose 0.2mg/L, and the control bleaching temperature is 52 ℃, bleaching time 60 minutes;
Finished product slurry quality: alpha cellulose 93.5%; Whiteness 83%; The fine degree of polymerization 497 of first; Ash content 0.10%; Iron divides 25mg/kg; Viscosity 11.5mpas; Inhale base number 500%; Reactivity worth 250s; Moisture 9.5%; Little dust 240mm
2/ kg; Big 1.0/kg of dust; Quantitative 800g/m
2
Embodiment three
Production stage is with embodiment one, wherein
Get the raw materials ready: numb material raw material is carried out preliminary treatment, remove numb material exocuticle, and numb material is cut into the long segment of 5cm, wash to wait and handle also removal of impurities, the quality index of numb material raw material is a sulfuric acid insoluble matter 8.7%, and ash content 2.85%, iron divide 285mg/kg;
The boiling materials: alkali using rate is 20% of oven dry stock amount in NaOH, cooking liquor sulphidity 30%, and the green oxygen of digesting assistant is 0.5% of oven dry stock amount, digesting assistant dodecyl sodium sulfate consumption is 1.5% of an oven dry stock amount, liquor ratio 1: 3.5.
Boiling: will be placed with numb material raw material and the rotary spherical digester for preparing cooking liquor cold commentaries on classics earlier 20 minutes, and lead to steam to rotary spherical digester and heat up 15 minutes heating-up time, pressure 0.30 ± 0.03Mpa, 12 minutes once little steam bleeding time, overbottom pressure is a normal pressure in the rotary spherical digester, 25 minutes secondary temperature elevation time, pressure 0.50 ± 0.03Mpa, the 17 minutes little steam bleeding time of secondary, overbottom pressure is 0.30 ± 0.03Mpa in the rotary spherical digester, three 20 minutes heating-up times, pressure 0.55～0.60Mpa, 160 ℃ of temperature, temperature retention time 80 minutes.Boiling slurry quality: the degree of polymerization 539, first fibre 94.3%.
Chlor-alkaliization: chlorine dosage is 2.1% of an oven dry stock, the residual chlorine 0.9g/L in alkalization back, the residual alkali 95mg/L in alkalization back.
Bleaching: adopt sodium hypochlorite bleaching, bleaching contains alkali 95mg/L, residual chlorine dose 0.5mg/L, and the control bleaching temperature is that bleaching temperature is 50 ℃, bleaching time 50 minutes;
Finished product slurry quality: alpha cellulose 92.5%; Whiteness 82%; The fine degree of polymerization 495 of first; Ash content 0.09%; Iron divides 24mg/kg; Viscosity 9.5mpas; Inhale base number 515%; Reactivity worth 240s; Moisture 10%; Little dust 235mm
2/ kg; Big 0.95/kg of dust; Quantitative 600g/m
2
Embodiment four
Production stage is with embodiment one, wherein
Get the raw materials ready: numb material raw material is carried out preliminary treatment, remove numb material exocuticle, and numb material is cut into the long segment of 4cm, wash to wait and handle also removal of impurities, the quality index of numb material raw material is a sulfuric acid insoluble matter 9.3%, and ash content 2.90%, iron divide 290mg/kg;
The boiling materials: alkali using rate is 30% of oven dry stock amount in NaOH, cooking liquor sulphidity 40%, and the green oxygen of digesting assistant is 1% of oven dry stock amount, digesting assistant dodecyl sodium sulfate consumption is 2.5% of an oven dry stock amount, liquor ratio 1: 4.5.
Boiling: will be placed with numb material raw material and the rotary spherical digester for preparing cooking liquor cold commentaries on classics earlier 20 minutes, and lead to steam to rotary spherical digester and heat up 15 minutes heating-up time, pressure 0.30 ± 0.03Mpa, 12 minutes once little steam bleeding time, overbottom pressure is a normal pressure in the rotary spherical digester, 35 minutes secondary temperature elevation time, pressure 0.50 ± 0.03Mpa, the 13 minutes little steam bleeding time of secondary, overbottom pressure is 0.30 ± 0.03Mpa in the rotary spherical digester, three 20 minutes heating-up times, pressure 0.55～0.60Mpa, 160 ℃ of temperature, temperature retention time 80 minutes.Boiling slurry quality: the degree of polymerization 548, first fibre 94.3%.
Chlor-alkaliization: chlorine dosage is 2.1% of an oven dry stock, the residual chlorine 0.9g/L in alkalization back, the residual alkali 95mg/L in alkalization back.
Bleaching: adopt sodium hypochlorite bleaching, bleaching contains alkali 40mg/L, residual chlorine dose 0.1mg/L, and the control bleaching temperature is 52 ℃, bleaching time 50 minutes;
Finished product slurry quality: alpha cellulose 92.3%; Whiteness 82%; The fine degree of polymerization 488 of first; Ash content 0.08%; Iron divides 23mg/kg; Viscosity 10mpas; Inhale base number 520% reactivity worth 225s; Moisture 10.5%; Little dust 232mm
2/ kg; Big 0.92/kg of dust; Quantitative 710g/m
2
Claims (6)
1, a kind of hemp dissolving pulp for chemical fabrics, adopting numb material is feedstock production, it is characterized in that: this hemp dissolving pulp alpha cellulose 〉=92%; Ash content≤0.10%; Iron branch≤25mg/kg; Viscosity 10.5 ± 1.0mpas; Whiteness 〉=81%; Inhale base number 〉=500%; Reactivity worth≤250s; Moisture 10.5 ± 1.0%; Little dust≤240mm
2/ kg; Big dust≤1.0/kg; Quantitative 700 ± 100g/m
2
2, hemp dissolving pulp for chemical fabrics according to claim 1, it is characterized in that: described numb material raw material is through preliminary treatment, remove numb material exocuticle, and numb material is cut into the long segment of 3～5cm, the quality index of fiber crops material raw material is sulfuric acid insoluble matter≤9.5%, ash content≤3.00%, iron branch≤300mg/kg.
3, a kind of production method of hemp dissolving pulp for chemical fabrics, adopting numb material is the raw material production hemp dissolving pulp, comprise and getting the raw materials ready, boiling, wash material, making beating, preceding selected desanding, concentrate, chlor-alkaliization, bleaching, the selected desanding in back, concentrate, the step of manufacturing paper with pulp makes hemp dissolving pulp, it is characterized in that: described boiling is a kraft cooking, alkali using rate is counted 10～30% of oven dry stock amount with NaOH, cooking liquor sulphidity 10～40%, the green oxygen of digesting assistant is 0.01～1% of oven dry stock amount, the digesting assistant dodecyl sodium sulfate is 0.01～3% of an oven dry stock amount, liquor ratio 1: 2～1: 4.5, boiling in rotary spherical digester.
4, the production method of hemp dissolving pulp for chemical fabrics according to claim 3, it is characterized in that: described kraft cooking is the rotary spherical digester cold commentaries on classics earlier that will be placed with numb material raw material and prepare cooking liquor after 10～20 minutes, in rotary spherical digester, feed steam and carry out boiling, 20 ± 5 minutes heating-up time, pressure 0.30 ± 0.03Mpa, 10 ± 2 minutes once little steam bleeding time, overbottom pressure is a normal pressure in the rotary spherical digester; 30 ± 5 minutes secondary temperature elevation time, pressure 0.50 ± 0.03Mpa, 15 ± 2 minutes little steam bleeding time of secondary, overbottom pressure 0.30 ± 0.03Mpa in the rotary spherical digester, three 25 ± 5 minutes heating-up times, pressure 0.55～0.78Mpa, 161 ± 20 ℃ of temperature, temperature retention time 80～300 minutes.
5, the production method of hemp dissolving pulp for chemical fabrics according to claim 3 is characterized in that: described chlor-alkali technical conditions are that chlorine dosage is 0.1%～2.3% of an oven dry stock amount, the residual chlorine 0.02～0.9g/L in alkalization back, the residual alkali 10～100mg/L in alkalization back.
6, the production method of hemp dissolving pulp for chemical fabrics according to claim 3 is characterized in that: sodium hypochlorite bleaching is adopted in described bleaching, and bleaching contains alkali 10～150mg/L, residual chlorine dose 0.1～0.5g/L.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101906675A (en) * | 2010-08-26 | 2010-12-08 | 河北吉藁化纤有限责任公司 | Preparation method of jute viscose |
| CN101580970B (en) * | 2009-06-09 | 2011-04-20 | 山东海龙股份有限公司 | Preparation method for hemp pulp and prepared hemp pulp |
| CN102181956A (en) * | 2011-03-21 | 2011-09-14 | 山东海龙股份有限公司 | Hemp viscose staple fiber and preparation method thereof |
| CN102220719A (en) * | 2011-03-23 | 2011-10-19 | 山东海龙股份有限公司 | Corncob husk pulp for chemical fibers and preparation method thereof |
| CN103114339A (en) * | 2013-03-18 | 2013-05-22 | 河南舒莱卫生用品有限公司 | Preparation method of hemp stalk viscose fiber and application thereof |
| CN103757958A (en) * | 2014-02-14 | 2014-04-30 | 湖南瑞亚高科集团有限公司 | Hemp pulp and preparation method |
| CN104790243A (en) * | 2015-04-30 | 2015-07-22 | 陈朝民 | Papermaking cooking assistant |
| CN105442060A (en) * | 2015-11-11 | 2016-03-30 | 六安市华龙麻纺工艺制品有限公司 | Hemp fiber preparation method |
| CN108004820A (en) * | 2017-11-14 | 2018-05-08 | 潍坊友容实业有限公司 | The method that the false indigo transplanted using salt-soda soil prepares pulp |
| CN109295519A (en) * | 2018-09-26 | 2019-02-01 | 武汉汉麻生物科技有限公司 | A kind of Chinese jute viscose and preparation method thereof |
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2008
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Cited By (15)
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| CN101580970B (en) * | 2009-06-09 | 2011-04-20 | 山东海龙股份有限公司 | Preparation method for hemp pulp and prepared hemp pulp |
| CN101906675A (en) * | 2010-08-26 | 2010-12-08 | 河北吉藁化纤有限责任公司 | Preparation method of jute viscose |
| CN101906675B (en) * | 2010-08-26 | 2012-09-05 | 河北吉藁化纤有限责任公司 | Preparation method of jute viscose |
| CN102181956B (en) * | 2011-03-21 | 2012-11-21 | 山东海龙股份有限公司 | Hemp viscose staple fiber and preparation method thereof |
| CN102181956A (en) * | 2011-03-21 | 2011-09-14 | 山东海龙股份有限公司 | Hemp viscose staple fiber and preparation method thereof |
| CN102220719B (en) * | 2011-03-23 | 2013-04-17 | 山东海龙股份有限公司 | Corncob husk pulp for chemical fibers and preparation method thereof |
| CN102220719A (en) * | 2011-03-23 | 2011-10-19 | 山东海龙股份有限公司 | Corncob husk pulp for chemical fibers and preparation method thereof |
| CN103114339A (en) * | 2013-03-18 | 2013-05-22 | 河南舒莱卫生用品有限公司 | Preparation method of hemp stalk viscose fiber and application thereof |
| CN103757958A (en) * | 2014-02-14 | 2014-04-30 | 湖南瑞亚高科集团有限公司 | Hemp pulp and preparation method |
| CN104790243A (en) * | 2015-04-30 | 2015-07-22 | 陈朝民 | Papermaking cooking assistant |
| CN105442060A (en) * | 2015-11-11 | 2016-03-30 | 六安市华龙麻纺工艺制品有限公司 | Hemp fiber preparation method |
| CN108004820A (en) * | 2017-11-14 | 2018-05-08 | 潍坊友容实业有限公司 | The method that the false indigo transplanted using salt-soda soil prepares pulp |
| CN109295519A (en) * | 2018-09-26 | 2019-02-01 | 武汉汉麻生物科技有限公司 | A kind of Chinese jute viscose and preparation method thereof |
| CN113062138A (en) * | 2021-04-22 | 2021-07-02 | 山东银鹰股份有限公司 | Preparation method of pulp for preparing viscose fiber from seed hemp |
| CN113062138B (en) * | 2021-04-22 | 2023-01-20 | 山东银鹰股份有限公司 | Preparation method of pulp for preparing viscose fiber from seed hemp |
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