CN102154906A - Paper pulp prepared from maize straw, preparation method thereof and paper product prepared from paper pulp - Google Patents
Paper pulp prepared from maize straw, preparation method thereof and paper product prepared from paper pulp Download PDFInfo
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- CN102154906A CN102154906A CN 201110099675 CN201110099675A CN102154906A CN 102154906 A CN102154906 A CN 102154906A CN 201110099675 CN201110099675 CN 201110099675 CN 201110099675 A CN201110099675 A CN 201110099675A CN 102154906 A CN102154906 A CN 102154906A
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- 240000008042 Zea mays Species 0.000 title claims abstract description 181
- 235000002017 Zea mays subsp mays Nutrition 0.000 title claims abstract description 181
- 235000016383 Zea mays subsp huehuetenangensis Nutrition 0.000 title claims abstract description 163
- 235000009973 maize Nutrition 0.000 title claims abstract description 163
- 229920001131 Pulp (paper) Polymers 0.000 title claims abstract description 121
- 238000002360 preparation method Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 claims abstract description 114
- 239000002994 raw material Substances 0.000 claims abstract description 87
- 238000010411 cooking Methods 0.000 claims abstract description 53
- 238000000605 extraction Methods 0.000 claims abstract description 36
- 230000035699 permeability Effects 0.000 claims abstract description 32
- 230000008569 process Effects 0.000 claims abstract description 25
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 210
- 239000002002 slurry Substances 0.000 claims description 208
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- 229910052760 oxygen Inorganic materials 0.000 claims description 151
- 239000000463 material Substances 0.000 claims description 92
- 238000006243 chemical reaction Methods 0.000 claims description 78
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 75
- 230000035484 reaction time Effects 0.000 claims description 64
- 238000009835 boiling Methods 0.000 claims description 62
- 238000005406 washing Methods 0.000 claims description 55
- PQUCIEFHOVEZAU-UHFFFAOYSA-N Diammonium sulfite Chemical compound [NH4+].[NH4+].[O-]S([O-])=O PQUCIEFHOVEZAU-UHFFFAOYSA-N 0.000 claims description 43
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 37
- 239000007788 liquid Substances 0.000 claims description 35
- PYKYMHQGRFAEBM-UHFFFAOYSA-N anthraquinone Natural products CCC(=O)c1c(O)c2C(=O)C3C(C=CC=C3O)C(=O)c2cc1CC(=O)OC PYKYMHQGRFAEBM-UHFFFAOYSA-N 0.000 claims description 34
- 150000004056 anthraquinones Chemical class 0.000 claims description 34
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 30
- 239000003513 alkali Substances 0.000 claims description 28
- 238000004061 bleaching Methods 0.000 claims description 28
- 239000003518 caustics Substances 0.000 claims description 24
- 229910021529 ammonia Inorganic materials 0.000 claims description 15
- 238000010792 warming Methods 0.000 claims description 14
- 229920005610 lignin Polymers 0.000 claims description 13
- 230000014759 maintenance of location Effects 0.000 claims description 13
- 238000005516 engineering process Methods 0.000 claims description 11
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 8
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims description 8
- 239000000460 chlorine Substances 0.000 claims description 8
- 229910052801 chlorine Inorganic materials 0.000 claims description 8
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 claims description 8
- 239000013522 chelant Substances 0.000 claims description 4
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims description 4
- 235000019341 magnesium sulphate Nutrition 0.000 claims description 4
- 230000008520 organization Effects 0.000 abstract 1
- 241000209140 Triticum Species 0.000 description 29
- 235000021307 Triticum Nutrition 0.000 description 29
- 241000209094 Oryza Species 0.000 description 21
- 235000007164 Oryza sativa Nutrition 0.000 description 21
- 230000029087 digestion Effects 0.000 description 21
- 235000009566 rice Nutrition 0.000 description 21
- 229920002488 Hemicellulose Polymers 0.000 description 18
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 18
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Abstract
The invention relates to maize straw paper pulp, which is prepared from maize straw serving as a raw material. The whiteness of the maize straw paper pulp is 38-60 percent ISO (International Standardization Organization), the bulk is 1.8-2.5 cm<3>/g, the tensile index is 35-65 N.m/g, the folding resistance is 10-40 times, the fracture length is 4.0-6.5 km, the air permeability is 70-200 ml/min, the ash content is 5-10 percent, the tear resistance is 180-260 mN, and the tear resistance index is 3.0-4.2 mN.m<2>/g. The paper pulp has good performance parameters, can replace the conventional wood pulp and can be used for preparing cultural paper and paper for daily use. A preparation method of the maize straw paper pulp comprises stock preparation, cooking and black liquor extraction, wherein the heat preserving time in the cooking process is 0-50 minutes.
Description
Technical field
What the present invention relates to is the preparation method of a kind of maize straw paper pulp, maize straw paper pulp and cultural paper product, the paper for daily use product that maize straw paper pulp is made.
Background technology
Because the shortage of present worldwide timber resources increases the weight of day by day, under the situation of not destroying forest and environment, produce the target that paper pulp and papermaking become each papermaking enterprise pursuit.As the scheme that addresses this problem, utilized 1 year or 2 years living plants as: discarded sugarcane stem, rice wheat straw etc. are received publicity by the technology that non-wood plant fibre is made paper pulp as main material always after farm waste, bamboo, the sugaring.
Though in the prior art to utilizing various 1 year or living plant slurrying in 2 years is studied, and obtain well behaved non-wood-fiber paper pulp, but it has been generally acknowledged that cellulosic content is too low in the maize straw, for example, cellulosic content about 40% in the wheat straw, and cellulosic content is about 30% in the maize straw, so the slurry yield of maize straw is low, and preparation flow is oversize; And in melting process, need to remove a large amount of leaf etc., and also being difficult to obtain high slurry yield, prior art even employing disleaf are handled except that the mode of marrow maize straw for this reason, and be specific as follows:
" application study of maize straw in pulp and paper industry " (East China paper industry, 2009 05 phases) disclose a kind of maize straw skin-stalk and separated after, the straw skin adopts caustic soda-anthraquinone method slurrying, the straw stalks of rice, wheat, etc. is copied paper through mixing with the straw latex after the chemical modification, improved the performance of slurry greatly, tensile index, burst index, tear index and folding strength have all obtained remarkable improvement.
" the maize straw discarded object is in the pulping and paper-making Application for Field " (Shandong Light Ind College, Pulp and Paper Engineering specialty Master's thesis, 2008-11-18) research of the corn stalk stalks of rice, wheat, etc. in field of papermaking is disclosed, cellulosic content is higher than wheat straw in the corn stalk skin, and lignin content is low than wheat straw, compare with wheat straw, the character of corn stalk skin can satisfy the requirement of pulp and paper industry to raw material.Under identical conditions of cooking, the corn stalk latex that adopts caustic soda-anthraquinone method to make is compared with Straw Pulp has higher pulp yield, a little higher than Straw Pulp of Kappa number.Behind the CEH tri-stage bleaching, straw latex whiteness can reach 74.5%ISO, and bleachability and strength character are slightly poorer than Straw Pulp.After the corn stalk stalks of rice, wheat, etc. that the process modification is handled joins in the straw latex, improve the strength character of straw latex greatly.Through the optimization of treatment conditions, after the corn stalk stalks of rice, wheat, etc. carried out modification and handle, whiteness can reach 80%ISO.Strength character the analysis showed that, when the straw stalks of rice, wheat, etc. mixes with the slurry of not pulling an oar, the improvement amplitude of strength character is bigger, to the making beating slurry the improvement effect also clearly, as the modification straw stalks of rice, wheat, etc. with join through the APMP slurry of making beating when copying, when straw stalks of rice, wheat, etc. content was 40%, tensile index had increased by 25.14%, tear index has increased by 2.39%, and burst index has increased by 18.96%.
" comprehensive utilization of maize straw " (Dalian Polytechnic College, Pulp and Paper Engineering specialty 2007-11-06) disclose and have a kind ofly carried out experimental study with the papermaking of maize straw crust, the comprehensive utilization technique of making the mold pressing amortizing packaging material with marrow.
" except that the shallow spy of marrow cornstalk Ammonium Sulfite Method boiling " (Dalian Polytechnic College, 2007,5 phases P30-32) disclosed except that the boiling of marrow cornstalk pulping with ammonium sulfite method, and the preferred process condition of the boiling of gained is as follows: 165 ℃ of maximum temperatures, temperature retention time 2.5 hours, liquor ratio 1: 6, imonium consumption 20%, anthraquinone consumption 0.05%, potassium sulfite consumption 2%, magnesia consumption 3%.The parameters of the paper pulp of optimizing is: unscreened yield 58.93%, whiteness 42.5%ISO, permanganate number 8.96.
Patent CN00819684.2 discloses the method that a kind of cornstalk prepares paper pulp, in this method, cornstalk removes marrow through disleaf and handles, in fact belong to corn stalk leather slurry, high-temperature holding time in the digestion process is 1.5-4 hour, the time of soak is longer, and cooking liquor is bigger to the degraded and the damage of the hemicellulose in the stalk, and pulp yield is low.
The resulting paper pulp of the disclosed technical scheme of above-mentioned document has obtained parameters preferably in the laboratory, but needs to remove marrow disleaf, the complexity of getting the raw materials ready in its melting process, be difficult to realize suitability for industrialized production, in addition, it is too low to remove behind the marrow utilization rate of stalk, and the cost of the paper pulp that makes is too high.
The technical problem that the whole slurrying of maize straw runs in the prior art mainly is that pulp yield is low, the color of paper pulp heavy, the physicochemical property parameter and the wood pulp of paper pulp have certain gap, can't be used for high-grade cultural paper and paper for daily use.
Usually cultural paper is meant printing, also is offset paper, or the abbreviation of light weight coated paper, generally restrains between 120 grams 60, and what be lower than 60 grams has been writing paper, and being higher than 120 grams has the two copper paper of crying of the glossiness of being coated with.Offset paper and two copper paper are high-grade paper products.Paper for daily use refers to for looking after the individual at home, and employed all kinds of health wipings paper such as go out comprises roll tissue, interfold toilet paper, box-packed facial tissue, pocket facial tissue, paper handkerchief, napkin paper, tissue, kitchen paper handkerchief.
The cultural paper of prior art and paper for daily use exist many shortcomings, use primary wood pulp more, owing to need a large amount of timber of felling, have a strong impact on the ecological balance of environment and cause long-range negative consequence; Tensile strength, pliability, the water imbibition of the cultural paper of part non-protogenous wood pulp preparation do not reach required standard;
Therefore, at existing defective in the above-mentioned prior art, how to utilize maize straw to prepare satisfactory culture and paper for daily use, prior art does not have more detailed explanation, in view of this, and special proposition the present invention.
Summary of the invention
The object of the present invention is to provide a kind of paper pulp by the cornstalk preparation, this paper pulp has good performance parameter, can replace conventional wood pulp.
Another object of the present invention is to provide a kind of and prepare the method for quality pulp by maize straw, wherein the temperature retention time of boiling is short, pulp yield is high, is a kind of economy, environmental protection, to cellulose and the little preparation method of hemicellulose damage.
The 3rd purpose of the present invention is to provide a kind of cultural paper and paper for daily use by the maize straw pulp preparation.
To achieve these goals, the technical solution used in the present invention is:
A kind of maize straw paper pulp, described corn stalk paper pulp is raw material with maize straw integral body, and the whiteness of described maize straw paper pulp is 38-60%ISO, and bulk is 1.8-2.5cm
3/ g, tensile index are 35-65N.m/g, and folding strength is 10-40 time, and fracture length is 4.0-6.5km, and air permeability is 70-200ml/min, and ash content is 5-10%, and tearability is 180-260mN, and the tearability index is 3.0-4.2mN.m
2/ g.
Described maize straw paper pulp is preferably: whiteness is 40-58%ISO, and bulk is 1.9-2.3cm
3/ g, tensile index are 45-60N.m/g, and folding strength is 15-30 time, and fracture length is 4.5-6.0km, and air permeability is 80-150ml/min, and ash content is 6-7%, and tearability is 200-240mN, and the tearability index is 3.5-4.0mN.m
2/ g.
Described maize straw paper pulp is more preferably: whiteness is 48-53%ISO, and bulk is 1.9-2.15cm
3/ g, tensile index are 47-53N.m/g, and folding strength is 20-30 time, and fracture length is 4.95-6.00km, and air permeability is 85-130ml/min, and ash content is 6.6%, and tearability is 220-240mN, and the tearability index is 3.5-3.9mN.m
2/ g.
Described maize straw paper pulp most preferably is: whiteness is 52%ISO, and bulk is 1.901cm
3/ g, tensile index are 52.13N.m/g, and folding strength is 25 times, and fracture length is 5.32km, and air permeability is 92ml/min, and tearability is 240mN, and the tearability index is 3.862mN.m
2/ g.
The preparation method of described maize straw paper pulp comprise get the raw materials ready, the step of boiling, black liquid extraction, the temperature retention time of described boiling is 0-50 minute, is preferably 0～40 minute, most preferably is 10～40 minutes.In the digestion process, digestion time is heating-up time and temperature retention time sum, and among the present invention, the heating-up time is 50～60 minutes, and total digestion time is 60～100 minutes, and preferred digestion time is less than 90 minutes greater than 60 minutes.
Described getting the raw materials ready is dry raw material preparation, or dry and wet stock preparation, during dry and wet stock preparation, through dewatering, being squeezed to mass dryness fraction more than 40%.
Described boiling is preferably caustic soda-anthraquinone method, Ammonium Sulfite Method or sodium carbonate method:
Described caustic soda-anthraquinone method is: add cooking liquor in the maize straw raw material of handling well, by weight, wherein alkali charge is in the 12-20% of NaOH to the over dry material quantity, preferred 13-15% and 17-20%, the anthraquinone addition is 0.08% of an over dry material quantity, liquor ratio is 1: 2.8-10, preferred 1: 2.8-4 and 1: 6-10; Feed steam and heat, heat temperature raising is incubated 0-40 minute to 120-140 ℃, preferred 20-30 minute.
Described Ammonium Sulfite Method is: add cooking liquor in the maize straw raw material of handling well, by weight, wherein the ammonium sulfite consumption is over dry material quantity 14-22%, preferred 16-20%, ammonia volume is over dry material quantity 3-7%, preferred 4-6%, and the anthraquinone addition is 0.08% of an over dry material quantity, liquor ratio is 1: 2.8-10, preferred 1: 2.8-4 and 1: 6-10; Feed steam and heat, heat temperature raising is incubated 10-50 minute to 160-175 ℃, preferred 10-40 minute.
Described sodium carbonate method is: add cooking liquor in the maize straw raw material of handling well, by weight, wherein sodium carbonate amount is over dry material quantity 15-22%, preferred 17-22%, and liquor ratio is 1: 2.8-10, preferred 1: 2.8-4 and 1: 6-9; Feed steam and heat, be warming up to 140-155 ℃, be incubated 10-50 minute, preferred 10-40 minute.
The above-mentioned maize straw raw material of handling well is after boiling finishes, the hardness that soda processes and Ammonium Sulfite Method obtain slurry is permanganate number 16-28, preferred hardness is permanganate number 18-23, it is permanganate number 30-35 that sodium carbonate method obtains slurry hardness, preferred hardness is the slurry of permanganate number 31-35, and most preferably hardness is the slurry of permanganate number 32-35.
Boiling is carried out black liquid extraction to thick slurry after finishing, and obtaining concentration is the clean slurry of 8-12%.
Among the described preparation method, also comprise the step of oxygen delignification or bleaching.
Among the above-mentioned preparation method,, can select bleaching to handle again getting the raw materials ready, after the boiling, black liquid extraction, both can selecting oxygen delignification.
With concentration is that the clean slurry of 8-12% is steam heated to 90-100 ℃, deliver to the oxygen delignification reaction tower, and add NaOH and oxygen, tower top pressure is 0.3-0.5Mpa, adopt single hop oxygen delignification, two sections oxygen delignifications or three sections oxygen delignifications, the reaction time is 60-240min.
Described single hop oxygen delignification is: by weight, sodium hydroxide concentration is the 2-3% of oven dry stock amount, and flow of oxygen is the 20-35Kg/t slurry, H
20
2Consumption is the 0-25Kg/t slurry, and reaction temperature is 90-100 ℃, and the reaction time is 60-90min.
Described two sections oxygen delignifications are: by weight, one section oxygen delignification sodium hydroxide concentration is the 2-3% of oven dry stock amount, and flow of oxygen is the 20-35Kg/t slurry, and reaction temperature is 90-100 ℃, and the reaction time is 45-60min; Two sections oxygen delignification sodium hydroxide concentrations are the 2-3% of oven dry stock amount, and flow of oxygen is the 20-35Kg/t slurry, H
20
2Consumption is the 10-25Kg/t slurry, and reaction temperature is 110-130 ℃, and the reaction time is 60-90min, and every section centre is not provided with washing.
Described three sections oxygen delignifications are: by weight, one section oxygen delignification sodium hydroxide concentration is the 2-3% of oven dry stock amount, and flow of oxygen is the 20-35Kg/t slurry, and reaction temperature is 90-100 ℃, and the reaction time is 45-60min; Two sections oxygen delignification sodium hydroxide concentrations are the 2-3% of oven dry stock amount, flow of oxygen is the 20-35Kg/t slurry, reaction temperature is 100-110 ℃, reaction time is 60-90min, three sections oxygen delignification sodium hydroxide concentrations are the 2-3% of oven dry stock amount, and flow of oxygen is the 20-35Kg/t slurry, and reaction temperature is 100-110 ℃, reaction time is 60-90min, and every section centre is not provided with washing section.
Described method for bleaching comprises H
2O
2Technology and CEH tri-stage bleaching.
Described H
2O
2Technology is: by weight, and H
2O
2Consumption be the oven dry stock amount 2-5%, alkali charge in NaOH to the 1-1.5% of oven dry stock amount, 0.1-0.2%, magnesium sulfate consumption that amount of chelant is the oven dry stock amount be the oven dry stock amount 0.2%, temperature is that 90-95 ℃, reaction time are 90-120min.
In the described CEH tri-stage bleaching, by weight, chloridization process is: slurry concentration is 5-8%, and the pH value is smaller or equal to 2, and the effective chlorine consumption is the 4-7% of oven dry stock amount, reaction temperature 35-50 ℃, and 1 hour reaction time; Alkali pretreatment is: the alkali consumption is counted 2% of oven dry stock amount with NaOH, slurry concentration 10%, and the pH value is 10, and reaction temperature is 35-50 ℃, and the reaction time is 1 hour; Hypochlorite bleaching is: the pH value is 9, and the effective chlorine consumption is the 2.5-4% of oven dry stock amount, and reaction temperature is 35-50 ℃, and the reaction time is 1.5-2 hour.
H
2O
2Maize straw paper pulp after the technology bleaching does not contain fluorescent whitening agent, organohalogen compounds, safety and environmental protection, the preferred H of the present invention
2O
2The technology bleaching.
Described maize straw paper pulp can be used for cultural paper, paper for daily use.
Below be detailed description of the present invention:
Because cellulosic content is higher than wheat straw in the corn stalk skin, help improving the intensity of paper pulp pulp yield and paper, and lignin content is low than wheat straw, help boiling and bleaching, and cellulosic content is lower than wheat straw in the whole maize straw, so mostly the paper mill is that adopting the corn stalk skin is raw pulp papermaking, the one, in order to improve pulp yield, the 2nd, the pulp brightness for preparing after the adding corn stalk stalks of rice, wheat, etc. is low, and color is dark, is difficult for bleaching.When adopting corn stalk leather slurry the skin stalks of rice, wheat, etc. is separated, the melting process complexity has increased production cost, also is difficult to realize large-scale industrialization production.Laboratory research is found, after in the corn stalk skin, adding a certain amount of modification straw stalks of rice, wheat, etc., the tensile index of prepared paper pulp, folding strength and tearability index all increase, and still, this method also is after earlier maize straw skin-stalk being separated, the corn stalk stalks of rice, wheat, etc. is carried out modification to be handled, the straw skin and the straw stalks of rice, wheat, etc. mix back slurrying according to certain proportioning then, and this method is only as a kind of laboratory research, the pulping process complexity, the production cost height is not suitable for the large-scale production in paper mill yet.
Maize straw paper pulp provided by the invention is to be raw material with maize straw integral body, and not disleaf of maize straw does not remove the stalks of rice, wheat, etc., does not need that the corn stalk stalks of rice, wheat, etc. is carried out modification and handles, and the method for getting the raw materials ready is simple, the utilization rate height of maize straw.Though maize straw cellulose content is relatively low, but hemicellulose level is higher, the present invention is by improving and optimization preparation technology, reduced the temperature retention time of the high temperature in the digestion process, significantly alleviated half-and-half cellulosic degraded and damage of cooking liquor in the digestion process, improved the pulp yield of maize straw paper pulp, reduced energy consumption, and the maize straw paper pulp various aspects of performance parameter of preparation is good, meet the requirement of high-quality cultural paper and paper for daily use, can substitute wood pulp fully paper pulp parameters parameter.In view of the maize straw raw material has that the source is wide, cost is low, do not destroy advantage such as ecological environment, maize straw paper pulp has development prospect preferably.
In the art, also have and think that oxygen delignification also is the part of association with pulp bleaching, for fear of ambiguity, in the present invention, the bleaching of maize straw paper pulp is carried out as giving a definition: the bleaching of the maize straw paper pulp described in the present invention is meant, if maize straw paper pulp of the present invention need bleaching, only be meant that the mode of other bleachings is bleached beyond the oxygen delignification mode.
The maize straw raw material requires homogeneity as much as possible when getting the raw materials ready, preferably adopt dry and wet stock preparation, with maize straw prescind, grating rubbing makes it to disperse, and screens to go out dust and impurity again, maize straw is made fines as far as possible.If moisture content changes greatly in the dry raw material preparation supplied materials, then must control the moisture content in the raw material, carry out dry and wet stock preparation, on the basis of dry raw material preparation, adopt the mode of pre-preg to be adjusted, the process of pre-preg comprises washing and the rubbing that the waterpower Straw-crumbling machine carries out maize straw, both helped further reducing the ash content in the maize straw, can guarantee that also the maize straw dipping is all even fully, after dipping is finished, through dehydration, be squeezed to mass dryness fraction more than 40%, help cooking liquor like this and evenly flood, liquor ratio could be relatively stable.
Maize straw is different from raw materials such as wheat straw, reed or timber, maize straw is a skin stalks of rice, wheat, etc. structure, the content of different chemical composition there are differences in the skin and the stalks of rice, wheat, etc., the main component of corn stalk skin is cellulose and lignin, hemicellulose level is abundant relatively in the straw stalks of rice, wheat, etc., lignin content is lower, institutional framework is loose, and generally speaking lignin content content relatively low, hemicellulose is higher relatively for stalk.Contain a certain amount of hemicellulose in the paper pulp and benefit, not only can improve the yield of slurry, the performance of the others of paper pulp is also had optimum influence.In digestion process, because the hemicellulose ratio is easier to degraded, consider that hemicellulose level is higher in the corn stalk stalks of rice, wheat, etc., and institutional framework is loose, therefore, be raw pulp with the maize straw, the maximum temperature and the digestion time of the boiling method in its digestion process, cooking liquor consumption, boiling, the temperature retention time of high temperature in the digestion process particularly, all has remarkable influence to the pulp yield and the pulp quality of paper pulp at half-and-half cellulosic degraded and damage.No matter be in the corn stalk leather slurry or the prior art of maize straw slurrying, there is the problem that the cooking liquor consumption is big, boiling temperature is high, digestion time is long, half-and-half cellulosic degraded and damage are particularly remarkable under High Temperature High Pressure for the overlong time of soak particularly, soup.And in the method for the invention, consider the difference of chemical composition content in the skin stalks of rice, wheat, etc. structure of maize straw and the skin stalks of rice, wheat, etc., studied the cooking liquor consumption, liquor ratio, the maximum temperature of boiling, the influence to lignin and half fiber degradation situation of process conditions such as intensification and insulation, by adjusting the soup consumption, liquor ratio, the process conditions of boilings such as the maximum temperature of boiling, significantly reduced the time of insulation, the time that makes maize straw be in High Temperature High Pressure shortens, under the process conditions that reduce the damage hemicellulose as far as possible, carry out boiling, improve the pulp yield of maize straw paper pulp, reduced energy consumption and production cost.In addition, because the hemicellulose in the maize straw and the hydroxyl of hydroxyl on the starch and cellulose surface have formed hydrogen bond, increased the hydrogen bond quantity on the fiber combining face, thereby increased interfibrous internal bond strength, because the temperature retention time of high temperature is short in the digestion process, the destruction of the hydrogen bond that cooking liquor forms the hydroxyl of hydroxyl on hemicellulose and the starch and cellulose surface and damage little, interfibrous internal bond strength height, thus improved the physical strength performance of slurry.
In view of the content of lignin in the maize straw is lower than wheat straw, the content of hemicellulose, carbohydrate, crude fat, crude protein is higher relatively, pigment content is higher, maize straw pulp brightness after the boiling is low, and alkaline process-anthraquinone stronger with the ability sodium carbonate method delignification, little to the hemicellulose damage, the pulp yield height, thick pulp color after the boiling is shallow, helps improving the whiteness of paper pulp; Pulping with ammonium sulfite method paper pulp yield height, become to produce cost low, thick pulp color after the boiling is shallow, help improving the whiteness of paper pulp, paper pulp gas permeability and drainability are good, and nitrogen content is relative with content of organics higher in the black liquor that obtains, the compoiste fertilizer fertilizer efficiency that this black liquor is made is outstanding, effect of increasing production is very remarkable, the damage of double fiber of sodium carbonate method is little, and so the paper pulp yield height is the present invention preferred alkaline process of boiling method-anthraquinone, Ammonium Sulfite Method or sodium carbonate method when slurrying.
In the caustic soda-anthraquinone method of the present invention, alkali charge is in the 12-20% of NaOH to the over dry material quantity, the anthraquinone addition is 0.08% of an over dry material quantity, and liquor ratio is 1: 2.8-10, at this moment, heat temperature raising is incubated boiling to 120-140 ℃, temperature retention time can be reduced to 0-40 minute greatly, and the slurry hardness that obtains after the caustic soda-anthraquinone method boiling is permanganate number 16-28, and the slurry after the boiling is carried out black liquid extraction, obtaining concentration is the clean slurry of 8-12%, and pulp yield is 48-55%; In the Ammonium Sulfite Method, the ammonium sulfite consumption is over dry material quantity 14-22%, and ammonia volume is over dry material quantity 3-7%, and the anthraquinone addition is 0.08% of an over dry material quantity, and liquor ratio is 1: 2.8-10; Feeding steam heats, heat temperature raising is to 160-175 ℃, temperature retention time can be reduced to 10-50 minute greatly, the slurry hardness that obtains after the Ammonium Sulfite Method boiling is permanganate number 16-28, slurry after the boiling is carried out black liquid extraction, obtaining concentration is the clean slurry of 8-12%, and pulp yield is 48-55%; In the sodium carbonate method, sodium carbonate amount is over dry material quantity 15-22%, liquor ratio is 1: 2.8-10, be warming up to 140-155 ℃ after the insulation, temperature retention time can be reduced to 10-50 minute, this moment, stalk still kept original shape, fiber does not separate, and is permanganate number 30-35 through discongesting disposed slurry hardness, then slurry is carried out black liquid extraction, obtaining concentration is the clean slurry of 8-12%, pulp yield 65-70%.During boiling after soak 0-50 minute, most lignin is degraded in the raw material, the degree of injury of hemicellulose is lighter, if continue to prolong temperature retention time, the degraded of hemicellulose and degree of injury will aggravate, particularly chemical bond has taken place with lignin and has been connected in the part hemicellulose in the maize straw, formed compound, under the situation that boiling constantly continues, along with lignin is constantly degraded and stripping, must also to lose this part hemicellulose, preparation method's of the present invention main improvement is greatly to have shortened the temperature retention time of high temperature in the digestion process, after finishing, boiling obtained the paper pulp of high rigidity, the pulp yield height of paper pulp.
All added anthraquinone in caustic soda-anthraquinone method among the present invention and the Ammonium Sulfite Method, the anthraquinone addition is 0.08% of an over dry material quantity, anthraquinone both can carbohydrate oxidation using reducing end group, make it to avoid peeling reaction, improve the yield of paper pulp, again can with lignin reaction, promote the degraded of lignin and remove, reduce alkali consumption and imonium consumption, shorten digestion time.
Ammonium Sulfite Method is bigger to the corrosion of digesting apparatus, by shortening digestion time, has alleviated the corrosion consumption of cooking liquor to digesting apparatus greatly among the present invention.
The digesting apparatus that adopts during boiling is a kind of in ball-type boiling vessel, vertical digester, transverse tube type continuous steamer and the vertical continuous steamer:
(1) in the ball-type boiling vessel during boiling:
Described caustic soda-anthraquinone method is: add cooking liquor in the maize straw raw material of handling well, alkali charge is in the 12-16% of NaOH to the over dry material quantity, the anthraquinone addition is 0.08% of an over dry material quantity, liquor ratio is 1: 2.8-4, feeding steam afterwards heats, heat temperature raising is incubated 0-30min to 120-140 ℃;
Described Ammonium Sulfite Method is: add cooking liquor in the maize straw raw material of handling well, wherein the ammonium sulfite consumption is over dry material quantity 14-20%, ammonia volume is over dry material quantity 3-6%, and the anthraquinone addition is 0.08% of an over dry material quantity, and liquor ratio is 1: 2.8-4; Feed steam and heat, heat temperature raising is incubated 10-40 minute to 160-175 ℃.
Described sodium carbonate method is: add cooking liquor in the maize straw raw material of handling well, wherein sodium carbonate amount is over dry material quantity 15-22%, and liquor ratio is 1: 2.8-10; Feed steam and heat, be warming up to 140-155 ℃ after insulation 10-50 minute, preferred 10-40 minute.
(2) in vertical digester during boiling:
Described caustic soda-anthraquinone method is: add cooking liquor in the maize straw raw material of handling well, alkali charge is in the 15-20% of NaOH to the over dry material quantity, the anthraquinone addition is 0.08% of an over dry material quantity, liquor ratio is 1: 6-10, feeding steam afterwards heats, heat temperature raising is incubated 0-40min to 120-140 ℃;
Described Ammonium Sulfite Method is: add cooking liquor in the maize straw raw material of handling well, wherein the ammonium sulfite consumption is over dry material quantity 14-22%, ammonia volume is over dry material quantity 4-7%, and the anthraquinone addition is 0.08% of an over dry material quantity, and liquor ratio is 1: 6-10; Feed steam and heat, heat temperature raising is incubated minute 10-50min to 160-175 ℃, preferred 10-40 minute.
Described sodium carbonate method is: add cooking liquor in the maize straw raw material of handling well, wherein sodium carbonate amount is over dry material quantity 15-22%, and liquor ratio is 1: 6-9; Feed steam and heat, be warming up to 140-155 ℃ after insulation 10-50 minute, preferred 10-40 minute.
(3) in the transverse tube type continuous steamer during boiling:
Described caustic soda-anthraquinone method is: add cooking liquor in the maize straw raw material of handling well, alkali charge is in the 12-16% of NaOH to the over dry material quantity, the anthraquinone addition is 0.08% of an over dry material quantity, liquor ratio is 1: 2.8-4, feeding steam afterwards heats, heat temperature raising is to 120-140 ℃, digestion time 20-40min;
Described Ammonium Sulfite Method is: add cooking liquor in the maize straw raw material of handling well, wherein the ammonium sulfite consumption is over dry material quantity 14-20%, ammonia volume is over dry material quantity 3-6%, and the anthraquinone addition is 0.08% of an over dry material quantity, and liquor ratio is 1: 2.8-4; Feed steam and heat, heat temperature raising is to 160-175 ℃, digestion time 30-40min.
Described sodium carbonate method is: add cooking liquor in the maize straw raw material of handling well, wherein sodium carbonate amount is over dry material quantity 15-22%, and liquor ratio is 1: 2.8-4; Feed steam and heat, be warming up to 140-155 ℃ after insulation 10-50 minute, preferred 10-40 minute.
(4) in vertical continuous steamer during boiling:
Described caustic soda-anthraquinone method is: add cooking liquor in the maize straw raw material of handling well, alkali charge is in the 15-20% of NaOH to the over dry material quantity, the anthraquinone addition is 0.08% of an over dry material quantity, liquor ratio is 1: 6-10, feeding steam afterwards heats, heat temperature raising is incubated 0-40min to 120-140 ℃;
Described Ammonium Sulfite Method is: add cooking liquor in the maize straw raw material of handling well, wherein the ammonium sulfite consumption is over dry material quantity 14-22%, ammonia volume is over dry material quantity 4-7%, and the anthraquinone addition is 0.08% of an over dry material quantity, and liquor ratio is 1: 6-10; Feed steam and heat, heat temperature raising is incubated 10-50 minute to 160-175 ℃, preferred 10-40 minute.
Described sodium carbonate method is: add cooking liquor in the maize straw raw material of handling well, wherein sodium carbonate amount is over dry material quantity 15-22%, and liquor ratio is 1: 6-9; Feed steam and heat, be warming up to 140-155 ℃ after insulation 10-50 minute, preferred 10-40 minute.
Adopt the transverse tube type continuous steamer to also have following advantage: yield, the saving fibrous raw material that can improve slurry, the intensity of finished product slurry is good, size performance is stable and all fair, drainability is good, favourable to pulp washing, can improve exerting oneself of wash engine, the consumption of alkaline boiling soup is low, steam consumption is low, steam does not have peak load, and promptly load is average, can alleviate the high cutting edge of a knife or a sword load of boiler.In the present invention, preferably adopt the transverse tube type continuous steamer to carry out boiling.
Thick slurry after caustic soda-anthraquinone method and the Ammonium Sulfite Method boiling, the religion of fiber dispersion ground is thin, does not need to discongest, and can directly enter black liquid extraction workshop section, discongests to make that fiber dispersion ground is thinner, increases the beating degree of slurry, increases the difficulty of wash engine; The thick slurry that obtains after the sodium carbonate method boiling enters black liquid extraction workshop section after discongesting.Thick slurry after the boiling obtains the clean slurry that concentration is 8-12% through black liquid extraction with after washing, enter the oxygen delignification reaction tower, oxygen delignification is the most key continuously to the quality of paper pulp and technology, when thick slurry after black liquid extraction and washing, the efficient of oxygen delignification has just improved.
Oxygen delignification mainly is in order further to reduce the hardness of paper pulp, oxygen delignification can adopt single hop oxygen delignification, two sections oxygen delignifications or three sections oxygen delignifications among the present invention, be fit to after caustic soda-anthraquinone method and the Ammonium Sulfite Method boiling adopt single hop oxygen delignification or two sections oxygen delignifications, be fit to adopt three sections oxygen delignifications after the sodium carbonate method boiling.
The concentration of sending into the slurry of oxygen delignification reaction tower is 8-12%, slurry in carry out oxygen delignification under the dense condition, in the major advantage of dense oxygen delignification be: invest less; Since in the success of dense mixing and pumping technology, the processing of slurry is dense more much easier than high; Slurry concentration is lower, and the corrosion of equipment is few, also the danger of not burning in oxygen.
Compared with prior art, beneficial effect of the present invention is:
The present invention is raw material with the maize straw, by optimizing and the improvement boiling method, greatly shortened digestion time, the shortening of digestion time has reduced the degraded and the loss of needed hemicellulose in the paper pulp on to greatest extent, improved the yield of paper pulp, obtained high-hardness pulp, and prepared maize straw pulp strength parameter can compare favourably with hardwood pulp, be a kind of high-grade paper pulp, can be made into high-grade cultural paper and paper for daily use, but maize straw has that the source is wide, cost is low, do not destroy advantage such as ecological environment.In addition, utilize whole maize straw slurrying, maize straw utilization rate height, the shortening of digestion time has not only reduced energy consumption and production cost to a great extent, has improved production efficiency, simultaneously also alleviated the consumption of cooking liquor, improved the output of digesting apparatus digesting apparatus.
Maize straw paper pulp provided by the invention; its whiteness is 38-60%ISO; the color of cultural paper is off-white color, rice white, paddy white more; color and luster is soft; eyesight there is the certain protection effect; the wood-free paper made from this paper pulp have a better balanced more physicochemical property, as: pliability is better, opacity is high, drainability is poorer, but cost balance height, texture and bulk are good, original copy is Well-recovered after folding, printing adaptability and the printing.
The specific embodiment
The present invention will be further described for following embodiment, but the present invention is not limited to this.
Embodiment 1
The maize straw raw material is packed into after getting the raw materials ready in the vertical digester, adopt caustic soda-anthraquinone method.In vertical digester, add cooking liquor, alkali charge is to 20% of over dry material quantity in NaOH, the anthraquinone addition is 0.08% of an over dry material quantity, and liquor ratio is 1: 6, feeds steam afterwards and heats, heat temperature raising to 140 ℃, be incubated 0 minute, obtaining hardness is the thick slurry of permanganate number 26, and thick slurry is carried out black liquid extraction, pulp washing, obtain concentration and be 12% clean slurry, pulp yield is 55%.
The whiteness of the maize straw paper pulp that obtains is 38%ISO, and bulk is 1.8cm
3/ g, tensile index are 47N.m/g, and folding strength is 10 times, and fracture length is 4.0km, and air permeability is 85ml/min, and ash content is 10%, and tearability is 180mN, and the tearability index is 3.1mN.m
2/ g.
Embodiment 2
The maize straw raw material is packed into after getting the raw materials ready in the vertical digester, adopt Ammonium Sulfite Method.Add cooking liquor in vertical digester, the ammonium sulfite consumption is an over dry material quantity 22%, and ammonia volume is an over dry material quantity 7%, and the anthraquinone addition is 0.08% of an over dry material quantity, and liquor ratio is 1: 6; Feed steam and heat, heat temperature raising to 175 ℃ is incubated 50 minutes, and obtaining hardness is the thick slurry of permanganate number 16.Thick slurry is carried out black liquid extraction, pulp washing, obtain concentration and be 8% clean slurry, pulp yield is 48%.
The whiteness of prepared maize straw paper pulp is 40%ISO, and bulk is 1.8cm
3/ g, tensile index are 45N.m/g, and folding strength is 15 times, and fracture length is 4.5km, and air permeability is 70ml/min, and ash content is 7%, and tearability is 200mN, and the tearability index is 3.0mN.m
2/ g.
Embodiment 3
The maize straw raw material is packed into after getting the raw materials ready in the transverse tube type continuous steamer, adopt caustic soda-anthraquinone method.In the transverse tube type continuous steamer, add cooking liquor, alkali charge is to 16% of over dry material quantity in NaOH, the anthraquinone addition is 0.08% of an over dry material quantity, and liquor ratio is 1: 2.8, feeds steam afterwards and heats, heat temperature raising to 140 ℃, be incubated 40 minutes, obtaining hardness is the thick slurry of permanganate number 17, and thick slurry is carried out black liquid extraction, pulp washing, obtain concentration and be 12% clean slurry, pulp yield is 49%.
The whiteness of prepared maize straw paper pulp is 48%ISO, and bulk is 1.9cm
3/ g, tensile index are 35N.m/g, and folding strength is 10 times, and fracture length is 4.0km, and air permeability is 80ml/min, and ash content is 7%, and tearability is 188mN, and the tearability index is 3.2mN.m
2/ g.
Embodiment 4
The maize straw raw material is packed into after getting the raw materials ready in the ball-type boiling vessel, adopt Ammonium Sulfite Method.Add cooking liquor in the ball-type boiling vessel, the ammonium sulfite consumption is an over dry material quantity 20%, and ammonia volume is an over dry material quantity 6%, and the anthraquinone addition is 0.08% of an over dry material quantity, and liquor ratio is 1: 2.8; Feed steam and heat, heat temperature raising to 175 ℃ is incubated 10 minutes, and obtaining hardness is the thick slurry of permanganate number 23.Thick slurry is carried out black liquid extraction, pulp washing, obtain concentration and be 10% clean slurry, pulp yield is 53%.
The whiteness of prepared maize straw paper pulp is 41%ISO, and bulk is 1.85cm
3/ g, tensile index are 37N.m/g, and folding strength is 14 times, and fracture length is 4.5km, and air permeability is 85ml/min, and ash content is 7%, and tearability is 190mN, and the tearability index is 3.2mN.m
2/ g.
Embodiment 5
The maize straw raw material is packed into after getting the raw materials ready in the ball-type boiling vessel, adopt caustic soda-anthraquinone method.In the ball-type boiling vessel, add cooking liquor, alkali charge is to 12% of over dry material quantity in NaOH, the anthraquinone addition is 0.08% of an over dry material quantity, liquor ratio is 1: 2.8, feeding steam afterwards heats, heat temperature raising to 120 ℃ is incubated 30 minutes, and can obtain hardness is the thick slurry of permanganate number 18.Thick slurry is carried out black liquid extraction, pulp washing, obtain concentration and be 8% clean slurry, pulp yield is 53%.To clean slurry afterwards and carry out the CEH tri-stage bleaching, wherein, chloridization process is: slurry concentration is 5%, and the pH value is 2, and the effective chlorine consumption is 4% of an oven dry stock amount, 50 ℃ of reaction temperatures, 1 hour reaction time; Alkali pretreatment is: the alkali consumption is counted 2% of oven dry stock amount with NaOH, slurry concentration 10%, and the pH value is 10, and reaction temperature is 35 ℃, and the reaction time is 1 hour; Hypochlorite bleaching is: the pH value is 9, and the effective chlorine consumption is 4% of an oven dry stock amount, and reaction temperature is 35 ℃, and the reaction time is 1.5 hours.
The maize straw paper pulp that obtains, its whiteness are 60%ISO, and bulk is 2.5cm
3/ g, tensile index are 53N.m/g, and folding strength is 20 times, and fracture length is 4.95km, and air permeability is 100ml/min, and ash content is 5%, and tearability is 200mN, and the tearability index is 3.5mN.m
2/ g.
Embodiment 6
The maize straw raw material is packed into after getting the raw materials ready in the vertical digester, adopt caustic soda-anthraquinone method.In vertical digester, add cooking liquor, alkali charge is to 15% of over dry material quantity in NaOH, the anthraquinone addition is 0.08% of an over dry material quantity, liquor ratio is 1: 10, feeding steam afterwards heats, behind the heat temperature raising to 120 ℃, be incubated 40 minutes, obtaining hardness is the thick slurry of permanganate number 18.Thick slurry is carried out black liquid extraction, pulp washing, obtain concentration and be 12% clean slurry, pulp yield is 52%.To clean slurry and be heated to 100 ℃, and deliver to the oxygen delignification reaction tower, and carry out the single hop oxygen delignification, wherein sodium hydroxide concentration is 3% of an oven dry stock amount, and flow of oxygen is the 35Kg/t slurry, H
20
2Consumption is the 0Kg/t slurry, and reaction temperature is 100 ℃, and the reaction time is 90min, and tower top pressure is 0.3Mpa.After finishing dealing with this slurry is spurted stock tank and dilution, after washing, screen, purifying, obtain maize straw paper pulp.
The whiteness of the maize straw paper pulp of preparation is 53%ISO, and bulk is 2.15cm
3/ g, tensile index are 47N.m/g, and folding strength is 25 times, and fracture length is 6.00km, and air permeability is 130ml/min, and ash content is 6%, and tearability is 240mN, and the tearability index is 3.9mN.m
2/ g.
Embodiment 7
The maize straw raw material is packed into after getting the raw materials ready in the transverse tube type continuous steamer, adopt caustic soda-anthraquinone method.In the transverse tube type continuous steamer, add cooking liquor, alkali charge is to 12% of over dry material quantity in NaOH, the anthraquinone addition is 0.08% of an over dry material quantity, liquor ratio is 1: 4, feeding steam afterwards heats, heat temperature raising to 120 ℃ is incubated 20 minutes, and obtaining hardness is the thick slurry of permanganate number 23.Thick slurry is carried out black liquid extraction, pulp washing, obtain concentration and be 8% clean slurry, pulp yield is 54%.To clean slurry and be heated to 100 ℃, and deliver to the oxygen delignification reaction tower, and carry out the single hop oxygen delignification, wherein sodium hydroxide concentration is 2% of an oven dry stock amount, and flow of oxygen is the 30Kg/t slurry, H
20
2Consumption is the 15Kg/t slurry, and reaction temperature is 95 ℃, and the reaction time is 80min, and tower top pressure is 0.5Mpa.
The whiteness of the maize straw paper pulp of preparation is 52%ISO, and bulk is 1.901cm
3/ g, tensile index are 52.13N.m/g, and folding strength is 23 times, and fracture length is 5.32km, and air permeability is 100ml/min, and ash content is 6.6%, and tearability is 240mN, and the tearability index is 3.862mN.m
2/ g.
Embodiment 8
The maize straw raw material is packed into after getting the raw materials ready in the vertical continuous steamer, adopt caustic soda-anthraquinone method.In vertical continuous steamer, add cooking liquor, alkali charge is to 20% of over dry material quantity in NaOH, the anthraquinone addition is 0.08% of an over dry material quantity, liquor ratio is 1: 10, feeding steam afterwards heats, heat temperature raising to 140 ℃ is incubated 0 minute, and can obtain hardness is the thick slurry of permanganate number 28.Thick slurry is carried out black liquid extraction, pulp washing, obtain concentration and be 8% clean slurry, pulp yield is 55%.To clean slurry and be heated to 90 ℃, deliver to the oxygen delignification reaction tower, carry out two sections oxygen delignifications, tower top pressure is 0.5Mpa, and wherein one section oxygen delignification sodium hydroxide concentration is 2% of an oven dry stock amount, and flow of oxygen is the 20Kg/t slurry, reaction temperature is 90 ℃, and the reaction time is 45min; Two sections oxygen delignification sodium hydroxide concentrations are 3% of oven dry stock amount, and flow of oxygen is the 20Kg/t slurry, H
20
2Consumption is the 10Kg/t slurry, and reaction temperature is 110 ℃, and the reaction time is 90min, and two sections centres are not provided with washing.After finishing dealing with this slurry is spurted stock tank and dilution, after washing, screen, purifying, obtain maize straw paper pulp.
The whiteness of the maize straw paper pulp of preparation is 60%ISO, and bulk is 2.3cm
3/ g, tensile index are 65N.m/g, and folding strength is 40 times, and fracture length is 4.0km, and air permeability is 150ml/min, and ash content is 7%, and tearability is 220mN, and the tearability index is 3.5mN.m
2/ g.
Embodiment 9
The maize straw raw material is packed into after getting the raw materials ready in the ball-type boiling vessel, adopt Ammonium Sulfite Method.Add cooking liquor in the ball-type boiling vessel, the ammonium sulfite consumption is an over dry material quantity 14%, and ammonia volume is an over dry material quantity 3%, and the anthraquinone addition is 0.08% of an over dry material quantity, and liquor ratio is 1: 4; Feed steam and heat, heat temperature raising to 160 ℃ is incubated 40 minutes, and obtaining hardness is the thick slurry of permanganate number 18.Thick slurry is carried out black liquid extraction, pulp washing, obtain concentration and be 8% clean slurry, pulp yield is 50%.To clean slurry and be heated to 90 ℃, and deliver to the oxygen delignification reaction tower, and carry out the single hop oxygen delignification, wherein sodium hydroxide concentration is 2% of an oven dry stock amount, and flow of oxygen is the 20Kg/t slurry, H
20
2Consumption is the 25Kg/t slurry, and reaction temperature is 90 ℃, and the reaction time is 60min, and tower top pressure is 0.4Mpa.After finishing dealing with this slurry is spurted stock tank and dilution, after washing, screen, purifying, obtain maize straw paper pulp.
The whiteness of the maize straw paper pulp that obtains is 58%ISO, and bulk is 2.15cm
3/ g, tensile index are 60N.m/g, and folding strength is 30 times, and fracture length is 6.00km, and air permeability is 110ml/min, and ash content is 6.6%, and tearability is 240mN, and the tearability index is 3.9mN.m
2/ g.
Embodiment 10
The maize straw raw material is packed into after getting the raw materials ready in the vertical digester, adopt Ammonium Sulfite Method.Add cooking liquor in vertical digester, the ammonium sulfite consumption is an over dry material quantity 14%, and ammonia volume is an over dry material quantity 4%, and the anthraquinone addition is 0.08% of an over dry material quantity, and liquor ratio is 1: 10; Feed steam and heat, heat temperature raising to 160 ℃ is incubated 10 minutes, and obtaining hardness is the thick slurry of permanganate number 28.Thick slurry is carried out black liquid extraction, pulp washing, obtain concentration and be 8% clean slurry, pulp yield is 54%.To clean slurry and be heated to 100 ℃, and deliver to the oxygen delignification reaction tower, tower top pressure is 0.5Mpa, adopt two sections oxygen delignifications: one section oxygen delignification sodium hydroxide concentration is 3% of an oven dry stock amount, flow of oxygen is the 35Kg/t slurry, and reaction temperature is 100 ℃, and the reaction time is 60min; Two sections oxygen delignification sodium hydroxide concentrations are 2% of oven dry stock amount, and flow of oxygen is the 35Kg/t slurry, H
20
2Consumption is the 25Kg/t slurry, and reaction temperature is 130 ℃, and the reaction time is 60min, and every section centre is not provided with washing.After finishing dealing with this slurry is spurted stock tank and dilution, after washing, screen, purifying, obtain maize straw paper pulp.
The whiteness of the maize straw paper pulp of preparation is 60%ISO, and bulk is 2.15cm
3/ g, tensile index are 60N.m/g, and folding strength is 27 times, and fracture length is 6.5km, and air permeability is 130ml/min, and ash content is 7%, and tearability is 240mN, and the tearability index is 4.2mN.m
2/ g.
Embodiment 11
The maize straw raw material is packed into after getting the raw materials ready in the transverse tube type continuous steamer, adopt Ammonium Sulfite Method.Add cooking liquor in the transverse tube type continuous steamer, the ammonium sulfite consumption is an over dry material quantity 20%, and ammonia volume is an over dry material quantity 6%, and the anthraquinone addition is 0.08% of an over dry material quantity, and liquor ratio is 1: 4; Feed steam and heat, heat temperature raising to 160 ℃ is incubated 30 minutes, and obtaining hardness is the thick slurry of permanganate number 18.Thick slurry is carried out black liquid extraction, pulp washing, obtain concentration and be 12% clean slurry, pulp yield is 50%.Carry out H afterwards
2O
2Bleaching process: H
2O
2Consumption be the oven dry stock amount 2%, alkali charge in NaOH to the oven dry stock amount 1%, amount of chelant be the oven dry stock amount 0.2%, the magnesium sulfate consumption be the oven dry stock amount 0.2%, temperature is that 90 ℃, reaction time are 90min.
The whiteness of prepared maize straw paper pulp is 58%ISO, and bulk is 2.0cm
3/ g, tensile index are 45N.m/g, and folding strength is 30 times, and fracture length is 4.5km, and air permeability is 130ml/min, and ash content is 6.6%, and tearability is 200mN, and the tearability index is 4.0mN.m
2/ g.
Embodiment 12
The maize straw raw material is packed into after getting the raw materials ready in the vertical continuous steamer, adopt Ammonium Sulfite Method.Add cooking liquor in vertical continuous steamer, the ammonium sulfite consumption is an over dry material quantity 14%, and ammonia volume is an over dry material quantity 7%, and the anthraquinone addition is 0.08% of an over dry material quantity, and liquor ratio is 1: 6; Feed steam and heat, heat temperature raising to 175 ℃ is incubated 50 minutes, and obtaining hardness is the thick slurry of permanganate number 20.Thick slurry is carried out black liquid extraction, pulp washing, obtain concentration and be 8% clean slurry, pulp yield is 52%.To clean slurry and be heated to 95 ℃, and deliver to the oxygen delignification reaction tower, and carry out two sections oxygen delignifications: tower top pressure is 0.5Mpa, one section oxygen delignification sodium hydroxide concentration is 2.5% of an oven dry stock amount, flow of oxygen is the 25Kg/t slurry, and reaction temperature is 95 ℃, and the reaction time is 50min; Two sections oxygen delignification sodium hydroxide concentrations are 2% of oven dry stock amount, and flow of oxygen is the 30Kg/t slurry, H
20
2Consumption is the 15Kg/t slurry, and reaction temperature is 120 ℃, and the reaction time is 70min, and every section centre is not provided with washing.After finishing dealing with this slurry is spurted stock tank and dilution, after washing, screen, purifying, obtain maize straw paper pulp.
The whiteness of the maize straw paper pulp of preparation is 59%ISO, and bulk is 1.901cm
3/ g, tensile index are 50N.m/g, and folding strength is 24 times, and fracture length is 5.32km, and air permeability is 92ml/min, and ash content is 6.6%, and tearability is 260mN, and the tearability index is 3.94mN.m
2/ g.
Embodiment 13
The maize straw raw material is packed into after getting the raw materials ready in the transverse tube type continuous steamer, adopt Ammonium Sulfite Method.Add cooking liquor in the transverse tube type continuous steamer, the ammonium sulfite consumption is an over dry material quantity 14%, and ammonia volume is an over dry material quantity 3%, and the anthraquinone addition is 0.08% of an over dry material quantity, and liquor ratio is 1: 2.8; Feed steam and heat, heat temperature raising to 175 ℃ is incubated 40 minutes, and obtaining hardness is the thick slurry of permanganate number 18.Thick slurry is carried out black liquid extraction, pulp washing, obtain concentration and be 12% clean slurry, pulp yield is 50%.To clean slurry afterwards and carry out the CEH tri-stage bleaching, wherein, chloridization process is: slurry concentration is 8%, and the pH value is 1.5, and the effective chlorine consumption is 7% of an oven dry stock amount, 35 ℃ of reaction temperatures, 1 hour reaction time; Alkali pretreatment is: the alkali consumption is counted 2% of oven dry stock amount with NaOH, slurry concentration 10%, and the pH value is 10, and reaction temperature is 50 ℃, and the reaction time is 1 hour; Hypochlorite bleaching is: the pH value is 9, and the effective chlorine consumption is 2.5% of an oven dry stock amount, and reaction temperature is 50 ℃, and the reaction time is 2 hours.
The whiteness of prepared maize straw paper pulp is 60%ISO, and bulk is 1.85cm
3/ g, tensile index are 53N.m/g, and folding strength is 24 times, and fracture length is 5.4km, and air permeability is 95ml/min, and ash content is 6%, and tearability is 241mN, and the tearability index is 3.86mN.m
2/ g.
Embodiment 14
The maize straw raw material is packed into after getting the raw materials ready in the ball-type boiling vessel, adopt sodium carbonate method.Add cooking liquor in the ball-type boiling vessel, wherein sodium carbonate amount is an over dry material quantity 15%, and liquor ratio is 1: 2.8; Feed steam and heat, be warming up to 155 ℃, be incubated 50 minutes, obtaining hardness is the thick slurry of permanganate number 31.Thick slurry is carried out black liquid extraction, pulp washing, obtain concentration and be 12% clean slurry, pulp yield is 68%.To clean slurry and be heated to 100 ℃, and deliver to the oxygen delignification reaction tower, and carry out three sections oxygen delignifications: tower top pressure is 0.5Mpa, one section oxygen delignification sodium hydroxide concentration is 3% of an oven dry stock amount, flow of oxygen is the 35Kg/t slurry, and reaction temperature is 100 ℃, and the reaction time is 60min; Two sections oxygen delignification sodium hydroxide concentrations are 2% of oven dry stock amount, and flow of oxygen is the 20Kg/t slurry, and reaction temperature is 100 ℃, and the reaction time is 60min; Three sections oxygen delignification sodium hydroxide concentrations are 2% of oven dry stock amount, and flow of oxygen is the 20Kg/t slurry, and reaction temperature is 100 ℃, and the reaction time is 60min, and every section centre is not provided with washing section.
The whiteness of prepared maize straw paper pulp is 60%ISO, and bulk is 1.9cm
3/ g, tensile index are 52.13N.m/g, and folding strength is 24 times, and fracture length is 5.32km, and air permeability is 92ml/min, and ash content is 6%, and tearability is 241mN, and the tearability index is 3.87mN.m
2/ g.
Embodiment 15
The maize straw raw material is packed into after getting the raw materials ready in the vertical digester, adopt sodium carbonate method.Add cooking liquor in vertical digester, wherein sodium carbonate amount is an over dry material quantity 22%, and liquor ratio is 1: 9; Feed steam and heat, be warming up to 140 ℃, be incubated 10 minutes, obtaining hardness is the thick slurry of permanganate number 35.Thick slurry is carried out black liquid extraction, pulp washing, obtain concentration and be 8% clean slurry, pulp yield is 70%.To clean slurry and be heated to 90 ℃, and deliver to the oxygen delignification reaction tower, and carry out three sections oxygen delignifications: tower top pressure is 0.3Mpa, one section oxygen delignification sodium hydroxide concentration is 2% of an oven dry stock amount, flow of oxygen is the 20Kg/t slurry, and reaction temperature is 90 ℃, and the reaction time is 45min; Two sections oxygen delignification sodium hydroxide concentrations are 3% of oven dry stock amount, and flow of oxygen is the 35Kg/t slurry, and reaction temperature is 110 ℃, and the reaction time is 90min; Three sections oxygen delignification sodium hydroxide concentrations are 3% of oven dry stock amount, and flow of oxygen is the 35Kg/t slurry, and reaction temperature is 110 ℃, and the reaction time is 90min, and every section centre is not provided with washing section.
The whiteness of prepared maize straw paper pulp is 58%ISO, and bulk is 1.901cm
3/ g, tensile index are 52.13N.m/g, and folding strength is 23 times, and fracture length is 5.32km, and air permeability is 92ml/min, and ash content is 6.6%, and tearability is 240mN, and the tearability index is 3.86mN.m
2/ g.
Embodiment 16
The maize straw raw material is packed into after getting the raw materials ready in the vertical digester, adopt sodium carbonate method.Add cooking liquor in vertical digester, wherein sodium carbonate amount is an over dry material quantity 15%, and liquor ratio is 1: 6; Feed steam and heat, be warming up to 155 ℃, be incubated 50 minutes, obtaining hardness is the thick slurry of permanganate number 30.Thick slurry is carried out black liquid extraction, pulp washing, obtain concentration and be 8% clean slurry, pulp yield is 65%.To clean slurry and be heated to 90 ℃, and deliver to the oxygen delignification reaction tower, and carry out three sections oxygen delignifications: tower top pressure is 0.5Mpa, one section oxygen delignification sodium hydroxide concentration is 2% of an oven dry stock amount, flow of oxygen is the 20Kg/t slurry, and reaction temperature is 90 ℃, and the reaction time is 45min; Two sections oxygen delignification sodium hydroxide concentrations are 3% of oven dry stock amount, and flow of oxygen is the 35Kg/t slurry, and reaction temperature is 110 ℃, and the reaction time is 90min; Three sections oxygen delignification sodium hydroxide concentrations are 3% of oven dry stock amount, and flow of oxygen is the 35Kg/t slurry, and reaction temperature is 110 ℃, and the reaction time is 90min, and every section centre is not provided with washing section.After finishing dealing with this slurry is spurted stock tank and dilution, after washing, screen, purifying, obtain maize straw paper pulp.
The whiteness of prepared maize straw paper pulp is 56%ISO, and bulk is 1.901cm
3/ g, tensile index are 52.13N.m/g, and folding strength is 23 times, and fracture length is 5.32km, and air permeability is 92ml/min, and ash content is 6.6%, and tearability is 240mN, and the tearability index is 3.86mN.m
2/ g.
Embodiment 17
The maize straw raw material is packed into after getting the raw materials ready in the transverse tube type continuous steamer, adopt sodium carbonate method.Add cooking liquor in the transverse tube type continuous steamer, wherein sodium carbonate amount is an over dry material quantity 22%, and liquor ratio is 1: 4; Feed steam and heat, be warming up to 140 ℃, be incubated 50 minutes, obtaining hardness is the thick slurry of permanganate number 30.Thick slurry is carried out black liquid extraction, pulp washing, obtain concentration and be 12% clean slurry, pulp yield is 65%.To clean slurry and be heated to 100 ℃, and deliver to the oxygen delignification reaction tower, and carry out three sections oxygen delignifications: tower top pressure is 0.5Mpa, one section oxygen delignification sodium hydroxide concentration is 2% of an oven dry stock amount, flow of oxygen is the 20Kg/t slurry, and reaction temperature is 100 ℃, and the reaction time is 45min; Two sections oxygen delignification sodium hydroxide concentrations are 2% of oven dry stock amount, and flow of oxygen is the 20Kg/t slurry, and reaction temperature is 110 ℃, and the reaction time is 90min; Three sections oxygen delignification sodium hydroxide concentrations are 2% of oven dry stock amount, and flow of oxygen is the 35Kg/t slurry, and reaction temperature is 110 ℃, and the reaction time is 60min, and every section centre is not provided with washing section.After finishing dealing with this slurry is spurted stock tank and dilution, after washing, screen, purifying, obtain maize straw paper pulp.
The whiteness of prepared maize straw paper pulp is 60%ISO, and bulk is 1.901cm
3/ g, tensile index are 53N.m/g, and folding strength is 26 times, and fracture length is 6.21km, and air permeability is 110ml/min, and ash content is 6%, and tearability is 241mN, and the tearability index is 3.862mN.m
2/ g.
Embodiment 18
The maize straw raw material is packed into after getting the raw materials ready in the transverse tube type continuous steamer, adopt sodium carbonate method.Add cooking liquor in the transverse tube type continuous steamer, wherein sodium carbonate amount is an over dry material quantity 15%, and liquor ratio is 1: 2.8; Feed steam and heat, be warming up to 155 ℃, be incubated 10 minutes, obtaining hardness is the thick slurry of permanganate number 34.Thick slurry is carried out black liquid extraction, pulp washing, obtain concentration and be 12% clean slurry, pulp yield is 70%.To clean slurry and be heated to 100 ℃, and deliver to the oxygen delignification reaction tower, and carry out three sections oxygen delignifications: tower top pressure is 0.5Mpa, one section oxygen delignification sodium hydroxide concentration is 2.5% of an oven dry stock amount, flow of oxygen is the 30Kg/t slurry, and reaction temperature is 100 ℃, and the reaction time is 50min; Two sections oxygen delignification sodium hydroxide concentrations are 2% of oven dry stock amount, and flow of oxygen is the 20Kg/t slurry, and reaction temperature is 110 ℃, and the reaction time is 90min; Three sections oxygen delignification sodium hydroxide concentrations are 2% of oven dry stock amount, and flow of oxygen is the 35Kg/t slurry, and reaction temperature is 110 ℃, and the reaction time is 60min, and every section centre is not provided with washing section.After finishing dealing with this slurry is spurted stock tank and dilution, after washing, screen, purifying, obtain maize straw paper pulp.
The whiteness of prepared maize straw paper pulp is 60%ISO, and bulk is 1.901cm
3/ g, tensile index are 53N.m/g, and folding strength is 26 times, and fracture length is 6.21km, and air permeability is 110ml/min, and ash content is 6%, and tearability is 241mN, and the tearability index is 3.862mN.m
2/ g.
Embodiment 19
The maize straw raw material is packed into after getting the raw materials ready in the vertical continuous steamer, adopt sodium carbonate method.Add cooking liquor in vertical continuous steamer, wherein sodium carbonate amount is an over dry material quantity 22%, and liquor ratio is 1: 6; Feed steam and heat, be warming up to 155 ℃, be incubated 10 minutes, obtaining hardness is the thick slurry of permanganate number 35.Thick slurry is carried out black liquid extraction, pulp washing, obtain concentration and be 12% clean slurry, pulp yield is 70%.To clean slurry and be heated to 100 ℃, and deliver to the oxygen delignification reaction tower, and carry out three sections oxygen delignifications: tower top pressure is 0.5Mpa, one section oxygen delignification sodium hydroxide concentration is 2% of an oven dry stock amount, flow of oxygen is the 20Kg/t slurry, and reaction temperature is 100 ℃, and the reaction time is 45min; Two sections oxygen delignification sodium hydroxide concentrations are 2% of oven dry stock amount, and flow of oxygen is the 20Kg/t slurry, and reaction temperature is 110 ℃, and the reaction time is 60min; Three sections oxygen delignification sodium hydroxide concentrations are 2% of oven dry stock amount, and flow of oxygen is the 35Kg/t slurry, and reaction temperature is 110 ℃, and the reaction time is 60min, and every section centre is not provided with washing section.After finishing dealing with this slurry is spurted stock tank and dilution, after washing, screen, purifying, obtain maize straw paper pulp.
The whiteness of prepared maize straw paper pulp is 53%ISO, and bulk is 2.01cm
3/ g, tensile index are 53N.m/g, and folding strength is 25 times, and fracture length is 6.00km, and air permeability is 90ml/min, and ash content is 6.6%, and tearability is 240mN, and the tearability index is 3.5mN.m
2/ g.
Embodiment 20
The maize straw raw material is packed into after getting the raw materials ready in the ball-type boiling vessel, adopt sodium carbonate method.Add cooking liquor in the ball-type boiling vessel, wherein sodium carbonate amount is an over dry material quantity 22%, and liquor ratio is 1: 10; Feed steam and heat, be warming up to 140 ℃, be incubated 10 minutes, obtaining hardness is the thick slurry of permanganate number 34.Thick slurry is carried out black liquid extraction, pulp washing, obtain concentration and be 12% clean slurry, pulp yield is 69%.To clean slurry and be heated to 100 ℃, and deliver to the oxygen delignification reaction tower, and carry out three sections oxygen delignifications: tower top pressure is 0.3Mpa, one section oxygen delignification sodium hydroxide concentration is 3% of an oven dry stock amount, flow of oxygen is the 35Kg/t slurry, and reaction temperature is 100 ℃, and the reaction time is 60min; Two sections oxygen delignification sodium hydroxide concentrations are 2% of oven dry stock amount, and flow of oxygen is the 20Kg/t slurry, and reaction temperature is 100 ℃, and the reaction time is 90min; Three sections oxygen delignification sodium hydroxide concentrations are 2% of oven dry stock amount, and flow of oxygen is the 35Kg/t slurry, and reaction temperature is 100 ℃, and the reaction time is 60min, and every section centre is not provided with washing section.After finishing dealing with this slurry is spurted stock tank and dilution, after washing, screen, purifying, obtain maize straw paper pulp.
The whiteness of prepared maize straw paper pulp is 58%ISO, and bulk is 1.901cm
3/ g, tensile index are 52.13N.m/g, and folding strength is 28 times, and fracture length is 4.95km, and air permeability is 100ml/min, and ash content is 6.6%, and tearability is 241mN, and the tearability index is 3.9mN.m
2/ g.
Embodiment 21
The maize straw raw material is packed into after getting the raw materials ready in the vertical continuous steamer, adopt caustic soda-anthraquinone method.In vertical continuous steamer, add cooking liquor, alkali charge is to 15% of over dry material quantity in NaOH, the anthraquinone addition is 0.08% of an over dry material quantity, liquor ratio is 1: 9, feed steam afterwards and heat, heat temperature raising to 140 ℃ is incubated 50 minutes, can obtain hardness is the thick slurry of permanganate number 16, and pulp yield is 49%.Thick slurry is carried out black liquid extraction, pulp washing, obtain concentration and be 8% clean slurry.Carry out H afterwards
2O
2Bleaching process: H
2O
2Consumption be the oven dry stock amount 2%, alkali charge in NaOH to the oven dry stock amount 1%, amount of chelant be the oven dry stock amount 0.2%, the magnesium sulfate consumption be the oven dry stock amount 0.2%, temperature is that 90 ℃, reaction time are 90min.
The whiteness of resulting paper pulp is 60%ISO, and bulk is 1.8cm
3/ g, tensile index are 53N.m/g, and folding strength is 40 times, and fracture length is 4.0km, and air permeability is 150ml/min, and ash content is 6.6%, and tearability is 245mN, and the tearability index is 3.9mN.m
2/ g.
Embodiment 22
The maize straw raw material is packed into after getting the raw materials ready in the vertical continuous steamer, adopt Ammonium Sulfite Method.Add cooking liquor in vertical continuous steamer, the ammonium sulfite consumption is an over dry material quantity 22%, and ammonia volume is an over dry material quantity 4%, and the anthraquinone addition is 0.08% of an over dry material quantity, and liquor ratio is 1: 10; Feed steam and heat, heat temperature raising to 160 ℃ is incubated 10 minutes, and obtaining hardness is the thick slurry of permanganate number 23.Thick slurry is carried out black liquid extraction, pulp washing, obtain concentration and be 8% clean slurry, pulp yield is 52%.To clean slurry and be heated to 95 ℃, and deliver to the oxygen delignification reaction tower, and carry out two sections oxygen delignifications: tower top pressure is 0.3Mpa, one section oxygen delignification sodium hydroxide concentration is 3% of an oven dry stock amount, flow of oxygen is the 20Kg/t slurry, and reaction temperature is 95 ℃, and the reaction time is 50min; Two sections oxygen delignification sodium hydroxide concentrations are 2% of oven dry stock amount, and flow of oxygen is the 30Kg/t slurry, and the H202 consumption is the 20Kg/t slurry, and reaction temperature is 120 ℃, and the reaction time is 70min, and every section centre is not provided with washing.After finishing dealing with this slurry is spurted stock tank and dilution, after washing, screen, purifying, obtain maize straw paper pulp.
The whiteness of resulting paper pulp is 60%ISO, and bulk is 1.9cm
3/ g, tensile index are 45N.m/g, and folding strength is 25 times, and fracture length is 6.22km, and air permeability is 115ml/min, and ash content is 8%, and tearability is 260mN, and the tearability index is 4.2mN.m
2/ g.
Embodiment 23
The maize straw raw material is packed into after getting the raw materials ready in the ball-type boiling vessel, adopt caustic soda-anthraquinone method.In the ball-type boiling vessel, add cooking liquor, alkali charge is to 16% of over dry material quantity in NaOH, the anthraquinone addition is 0.08% of an over dry material quantity, liquor ratio is 1: 4, feeding steam afterwards heats, heat temperature raising to 140 ℃ is incubated 0 minute, and can obtain hardness is the thick slurry of permanganate number 28.Thick slurry is carried out black liquid extraction, pulp washing, obtain concentration and be 8% clean slurry, pulp yield is 55%.To clean slurry and be heated to 95 ℃, and deliver to the oxygen delignification reaction tower, and carry out two sections oxygen delignifications: tower top pressure is 0.3Mpa, one section oxygen delignification sodium hydroxide concentration is 2% of an oven dry stock amount, flow of oxygen is the 35Kg/t slurry, and reaction temperature is 95 ℃, and the reaction time is 50min; Two sections oxygen delignification sodium hydroxide concentrations are 2% of oven dry stock amount, and flow of oxygen is the 30Kg/t slurry, and the H202 consumption is the 15Kg/t slurry, and reaction temperature is 120 ℃, and the reaction time is 70min, and every section centre is not provided with washing.After finishing dealing with this slurry is spurted stock tank and dilution, after washing, screen, purifying, obtain maize straw paper pulp.
The maize straw paper pulp that obtains, its whiteness are 58%ISO, and bulk is 2.5cm
3/ g, tensile index are 53N.m/g, and folding strength is 15 times, and fracture length is 4.95km, and air permeability is 200ml/min, and ash content is 5%, and tearability is 200mN, and the tearability index is 3.5mN.m
2/ g.
Embodiment 24
Manufacture paper with pulp after the bleaching commercial wood pulp of the maize straw paper pulp of embodiment 7 preparation of weight portion 75% and 25% mixed, obtain natural color offset plate printing paper.Described natural color offset plate printing paper quantitatively is 56g/m
2, opacity 83.7%, fracture length (in length and breadth to average) is 3.11km, and whiteness is 62.6%ISO, and laterally folding strength is 6 times, lateral extensometer shrinkage≤2.8%.
Claims (15)
1. a maize straw paper pulp is characterized in that, described maize straw paper pulp is raw material with the maize straw, and the whiteness of described maize straw paper pulp is 38-60%ISO, and bulk is 1.8-2.5cm
3/ g, tensile index are 35-65N.m/g, and folding strength is 10-40 time, and fracture length is 4.0-6.5km, and air permeability is 70-200ml/min, and ash content is 5-10%, and tearability is 180-260mN, and the tearability index is 3.0-4.2mN.m
2/ g;
Described maize straw paper pulp is preferably: whiteness is 40-58%ISO, and bulk is 1.9-2.3cm
3/ g, tensile index are 45-60N.m/g, and folding strength is 15-30 time, and fracture length is 4.5-6.0km, and air permeability is 80-150ml/min, and ash content is 6-7%, and tearability is 200-240mN, and the tearability index is 3.5-4.0mN.m
2/ g;
Described maize straw paper pulp is more preferably: whiteness is 48-53%ISO, and bulk is 1.9-2.15cm
3/ g, tensile index are 47-53N.m/g, and folding strength is 20-30 time, and fracture length is 4.95-6.00km, and air permeability is 85-130ml/min, and ash content is 6.6%, and tearability is 220-240mN, and the tearability index is 3.5-3.9mN.m
2/ g.
2. the preparation method of a maize straw paper pulp as claimed in claim 1, described preparation method comprise get the raw materials ready, the step of boiling, black liquid extraction, it is characterized in that the temperature retention time of described boiling is 0～50 minute, be preferably 0～40 minute, most preferably be 10～40 minutes.
3. the preparation method of maize straw paper pulp as claimed in claim 2 is characterized in that, the method for described boiling comprises caustic soda-anthraquinone method, Ammonium Sulfite Method and sodium carbonate method; Described caustic soda-anthraquinone method and Ammonium Sulfite Method boiling obtain the slurry that hardness is permanganate number 16-28, and preferred hardness is the slurry of permanganate number 18-23; Described sodium carbonate method boiling obtains the slurry that hardness is permanganate number 30-35, and preferred hardness is the slurry of permanganate number 31-35.
4. the preparation method of maize straw paper pulp as claimed in claim 3, it is characterized in that, described Ammonium Sulfite Method is: add cooking liquor in the maize straw raw material of handling well, by weight, wherein the ammonium sulfite consumption is over dry material quantity 14-22%, preferred 16-20%, ammonia volume is over dry material quantity 3-7%, preferred 4-6%, and the anthraquinone addition is 0.08% of an over dry material quantity, liquor ratio is 1: 2.8-10, preferred 1: 2.8-4 and 1: 6-10; Feed steam and heat, heat temperature raising is incubated 10-50 minute to 160-175 ℃, preferred 10-40 minute.
5. the preparation method of maize straw paper pulp as claimed in claim 3, it is characterized in that, described sodium carbonate method is: add cooking liquor in the maize straw raw material of handling well, by weight, wherein sodium carbonate amount is over dry material quantity 15-22%, liquor ratio is 1: 2.8-10, preferred 1: 2.8-4 and 1: 6-9; Feed steam and heat, be warming up to 140-155 ℃, be incubated 10-50 minute, preferred 10-40 minute.
6. the preparation method of maize straw paper pulp as claimed in claim 3, it is characterized in that, described caustic soda-anthraquinone method is: add cooking liquor in the maize straw raw material of handling well, by weight, wherein alkali charge is in the 12-20% of NaOH to the over dry material quantity, preferred 13-15% and 17-20%, and the anthraquinone addition is 0.08% of an over dry material quantity, liquor ratio is 1: 2.8-10, preferred 1: 2.8-4 and 1: 6-10; Feed steam and heat, heat temperature raising is incubated 0-40 minute to 120-140 ℃, preferred 20-30 minute.
7. the preparation method of maize straw paper pulp as claimed in claim 2 is characterized in that, obtaining concentration after the black liquid extraction is the clean slurry of 8-12%.
8. the preparation method of maize straw paper pulp as claimed in claim 2 is characterized in that, among the described preparation method, also comprises the step of oxygen delignification or bleaching.
9. the preparation method of maize straw paper pulp as claimed in claim 8 is characterized in that, described oxygen delignification adopts single hop oxygen delignification, two sections oxygen delignifications or three sections deoxidation lignins, and the reaction time is 60-240min.
10. the preparation method of maize straw paper pulp as claimed in claim 9 is characterized in that, described single hop oxygen delignification is: by weight, sodium hydroxide concentration is the 2-3% of oven dry stock amount, and flow of oxygen is the 20-35Kg/t slurry, H
20
2Consumption is the 0-25Kg/t slurry, and reaction temperature is 90-100 ℃, and the reaction time is 60-90min.
11. the preparation method of maize straw paper pulp as claimed in claim 9, it is characterized in that, described two sections oxygen delignifications are: by weight, one section oxygen delignification sodium hydroxide concentration is the 2-3% of oven dry stock amount, flow of oxygen is the 20-35Kg/t slurry, reaction temperature is 90-100 ℃, and the reaction time is 45-60min; Two sections oxygen delignification sodium hydroxide concentrations are the 2-3% of oven dry stock amount, and flow of oxygen is the 20-35Kg/t slurry, H
20
2Consumption is the 10-25Kg/t slurry, and reaction temperature is 110-130 ℃, and the reaction time is 60-90min, and every section centre is not provided with washing.
12. the preparation method of maize straw paper pulp as claimed in claim 9, it is characterized in that, described three sections oxygen delignifications are: by weight, one section oxygen delignification sodium hydroxide concentration is the 2-3% of oven dry stock amount, flow of oxygen is the 20-35Kg/t slurry, reaction temperature is 90-100 ℃, and the reaction time is 45-60min; Two sections oxygen delignification sodium hydroxide concentrations are the 2-3% of oven dry stock amount, and flow of oxygen is the 20-35Kg/t slurry, and reaction temperature is 100-110 ℃, and the reaction time is 60-90min; Three sections oxygen delignification sodium hydroxide concentrations are the 2-3% of oven dry stock amount, and flow of oxygen is the 20-35Kg/t slurry, and reaction temperature is 100-110 ℃, and the reaction time is 60-90min, and every section centre is not provided with washing section.
13. the preparation method of maize straw paper pulp as claimed in claim 8 is characterized in that, the method for described bleaching is H
2O
2Technology, described H
2O
2Technology is: by weight, and H
2O
2Consumption be the oven dry stock amount 2-5%, alkali charge in NaOH to the 1-1.5% of oven dry stock amount, 0.1-0.2%, magnesium sulfate consumption that amount of chelant is the oven dry stock amount be the oven dry stock amount 0.2%, temperature is that 90-95 ℃, reaction time are 90-120min.
14. the preparation method of maize straw paper pulp as claimed in claim 8, it is characterized in that, the method of described bleaching is the CEH tri-stage bleaching, in the described CEH tri-stage bleaching, by weight, chloridization process is: slurry concentration is 5-8%, the pH value is smaller or equal to 2, the effective chlorine consumption is the 4-7% of oven dry stock amount, reaction temperature 35-50 ℃, and 1 hour reaction time; Alkali pretreatment is: the alkali consumption is counted 2% of oven dry stock amount with NaOH, slurry concentration 10%, and the pH value is 10, and reaction temperature is 35-50 ℃, and the reaction time is 1 hour; Hypochlorite bleaching is: the pH value is 9, and the effective chlorine consumption is the 2.5-4% of oven dry stock amount, and reaction temperature is 35-50 ℃, and the reaction time is 1.5-2 hour.
15. the application of maize straw paper pulp as claimed in claim 1 in preparation cultural paper, paper for daily use.
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| CN102561094A (en) * | 2012-01-06 | 2012-07-11 | 黑龙江浩源生物科技有限公司 | Method for making pulp and paper by using cornstalk xylose residue |
| CN102965992A (en) * | 2012-11-27 | 2013-03-13 | 山东泉林纸业有限责任公司 | Fiber raw material |
| CN102978981A (en) * | 2012-11-27 | 2013-03-20 | 山东泉林纸业有限责任公司 | Fiber raw material for papermaking |
| CN102978982A (en) * | 2012-11-27 | 2013-03-20 | 山东泉林纸业有限责任公司 | Corn stalk material for making paper |
| CN102978983A (en) * | 2012-11-27 | 2013-03-20 | 山东泉林纸业有限责任公司 | Industrial maize straw raw material |
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| CN103572639A (en) * | 2012-08-06 | 2014-02-12 | 山东泉林纸业有限责任公司 | Paper pulp prepared from corn stalks and preparation method of paper pulp |
| CN104389215A (en) * | 2014-10-23 | 2015-03-04 | 广东比伦生活用纸有限公司 | Production method for environment-friendly and energy-saving living paper wood pulp |
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| CN112726249A (en) * | 2020-12-29 | 2021-04-30 | 陕西科技大学 | Dissolving pulp prepared from corn straw skins and method |
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| CN102978982A (en) * | 2012-11-27 | 2013-03-20 | 山东泉林纸业有限责任公司 | Corn stalk material for making paper |
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| CN102978981B (en) * | 2012-11-27 | 2015-03-25 | 山东泉林纸业有限责任公司 | Fiber raw material for papermaking |
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| CN102978982B (en) * | 2012-11-27 | 2015-09-02 | 山东泉林纸业有限责任公司 | A kind of paper grade (stock) corn stalk raw material |
| CN104389215A (en) * | 2014-10-23 | 2015-03-04 | 广东比伦生活用纸有限公司 | Production method for environment-friendly and energy-saving living paper wood pulp |
| CN104890085A (en) * | 2015-05-19 | 2015-09-09 | 浙江农林大学 | Method for preparing process bamboo paper and process bamboo books |
| CN104928958A (en) * | 2015-05-25 | 2015-09-23 | 张家港市欣发包装有限责任公司 | Method of producing corrugated paper with straw |
| CN108286201A (en) * | 2017-01-08 | 2018-07-17 | 深圳市龙城生物科技股份有限公司 | A kind of technique of wheat straw fiber and its biological enzyme separation fiber |
| CN109680554A (en) * | 2018-11-26 | 2019-04-26 | 海盐昆植生物技术有限公司 | Plant petals/blade standard colorimetric paper |
| WO2022062762A1 (en) * | 2020-09-28 | 2022-03-31 | 刘玉芳 | Production process for cotton stalk-molded meal box pulp having byproduct fulvic acid |
| CN112726249A (en) * | 2020-12-29 | 2021-04-30 | 陕西科技大学 | Dissolving pulp prepared from corn straw skins and method |
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