CN1784525A - Process for the production of paper - Google Patents
Process for the production of paper Download PDFInfo
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- CN1784525A CN1784525A CNA2004800125406A CN200480012540A CN1784525A CN 1784525 A CN1784525 A CN 1784525A CN A2004800125406 A CNA2004800125406 A CN A2004800125406A CN 200480012540 A CN200480012540 A CN 200480012540A CN 1784525 A CN1784525 A CN 1784525A
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- aqueous fluid
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/06—Paper forming aids
- D21H21/10—Retention agents or drainage improvers
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/24—Addition to the formed paper during paper manufacture
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Abstract
The invention relates to a process for the production of paper which comprises (i) providing a main aqueous flow containing cellulosic fibres; (i) introducing one or more retention components into the main aqueous flow to form a main aqueous flow containing one or more retention components; (iii) providing a diluting aqueous flow; (iv) introducing a low molecular weight cationic organic polymer into the diluting aqueous flow to form a diluting aqueous flow containing a low molecular weight cationic organic polymer, the low molecular weight cationic organic polymer having a weight average molecular weight up to 5,000,000; (v) introducing the diluting aqueous flow containing a low molecular weight cationic organic polymer into the main aqueous flow containing one or more retention components to form a resulting aqueous flow; and then (vi) ejecting the resulting aqueous flow onto a wire and dewatering the resulting aqueous flow to form a web of paper. The invention further relates to a process for the production of paper on a paper machine containing a dilution headbox which comprises (i) introducing one or more retention components into a main aqueous flow containing cellulosic fibres, and feeding the obtained main aqueous flow into the dilution headbox; (ii) introducing low molecular weight cationic organic polymer having a weight average molecular weight up to 5,000,000 into a diluting aqueous flow and feeding the obtained diluting aqueous flow into the dilution headbox; (iii) mixing the obtained main aqueous flow with the obtained diluting aqueous flow in the headbox to form a resulting aqueous flow; and (iv) ejecting the resulting aqueous flow onto a wire and dewatering the resulting aqueous flow to form a web of paper.
Description
Invention field
The present invention relates to a kind of papermaking process, wherein before the cellulose paper stock being sprayed onto online from head box and dewatering the formation gauze, additive for paper making is joined in the cellulose paper stock.
Background technology
In paper technology, will contain the water suspension of cellulose fibre, any filler and additive, promptly so-called paper stock adds in the head box, and head box is ejected into paper stock on the forming web.Water is discharged from paper stock, thereby forms the l Water Paper net on forming web, then with further dehydration and in the drying nest drying of paper machine of gauze.
Usually retention agent is added in the paper stock to increase fine grained such as fine fibre and the absorption of filler grain on cellulose fibre, they are just stayed on the forming web with fiber like this.Various retention agents are known in the art, for example comprise anion, nonionic, amphion and the cationic organic polymer of different molecular weight, inorganic material, and composition thereof.Owing to be incomplete reservation, the water that is obtained by paper stock and the dehydration of l Water Paper net is called plain boiled water, contains the fine particle that is not retained on the forming web, and plain boiled water circulates in different flow processs usually.
In having the paper machine of dilution headbox, in this head box, dilute paper stock with plain boiled water.So the low denseness fluid that high-consistency paper stock stream is formed by plain boiled water dilutes.Head box can have a series of mixed zone or spread all over the dilution circuit of head box width.Plain boiled water is injected into the mixed zone to control the dilution factor of paper stock on the spot, therefore forms a variable profile of denseness (profile) and leave the labial lamina opening with constant volume flow.The design of this dilution headbox can be controlled the performance of paper better; By the amount of regulating dilutions at a plurality of points of the dilution headbox of crossing paper machine, i.e. the ratio of high-consistency fluid and low denseness fluid can be controlled the basis weight of gauze and makes it evenly to distribute along paper machine cross basically in a kind of mode of improvement.Yet it should be noted that rule of thumb this papermaking process and made paper performance thereof still can not be entirely satisfactory when using high performance retention agent, this is owing to can not fully controlling the pitch deposition.
Had realized that before in the process of production all kinds paper that the pitch and the interior bitumen ball cognition that forms of finished paper that concentrate on the paper machine caused problem.Pitch typically refers to emulsified hydrophobic organic compound.Pitch can be defined as in the process of making pulp, the viscosity that discharges from timber, resinae material.Pitch also comprises by the fragmentation and component on the recycled fiber such as the adhesive that apply, the stickum of generation, and it often is known as sicker (stickies) and adhesion (tackies).In the process water in paper mill, pitch exists as unsettled hydrophobic particles colloidal dispersion.Therefore, typical paper technology condition, as the sudden change of hydrokinetic and mechanical shear stress and temperature and chemical environment and chemical balance, all may cause colloidal state pitch particle coacervation in cellulose suspension or be deposited on the surface of forming web or other equipment.The mass defect that so just may cause finished product as forming spot or hole and paper inferior, shortens service life of equipment, operational failure, and paper machine is stopped work, and finally causes factory's benefit impaired.The problems referred to above are in process water height sealing, and are very outstanding in the factory of circulating on a large scale as plain boiled water.
Summary of the invention
The present invention relates generally to a kind of papermaking process, and it comprises:
(i) provide the main aqueous fluid that comprises cellulose fibre;
(ii) one or more retained fractions are joined the main aqueous fluid that comprises one or more retained fractions in the described main aqueous fluid with formation;
The dilution aqueous fluid (iii) is provided;
(iv) the low molecular weight cationic organic polymer is joined the dilution aqueous fluid that comprises the low molecular weight cationic organic polymer in the described dilution aqueous fluid with formation, the weight average molecular weight of above-mentioned low molecular weight cationic organic polymer is up to 5,000, and 000;
(v) the above-mentioned dilution aqueous fluid that comprises the low molecular weight cationic organic polymer is joined in the main aqueous fluid that comprises one or more retained fractions to form the aqueous fluid of gained; Then
(vi) the aqueous fluid with above-mentioned gained is sprayed onto on the forming web, and the aqueous fluid of gained is dewatered to form gauze.
The invention further relates to a kind ofly in the method that comprises papermaking on the paper machine of dilution headbox, the method comprises:
(i) one or more retained fractions are joined in the main aqueous fluid that contains cellulose fibre, and resulting main aqueous fluid is injected in the dilution headbox;
(ii) with weight average molecular weight up to 5,000,000 low molecular weight cationic organic polymer joins in the dilution aqueous fluid, and resulting dilution aqueous fluid is injected in the dilution headbox;
(iii) in head box, mix resulting main aqueous fluid and resulting dilution aqueous fluid to form the aqueous fluid of gained; With
(iv) above-mentioned gained aqueous fluid is sprayed onto on the forming web, and the gained aqueous fluid is dewatered to form gauze.
The invention still further relates to a kind of method by the aqueous suspension papermaking that contains any filler of cellulose fiber peacekeeping, the method comprises one or more retained fractions is joined in the suspension, then in suspension, add weight average molecular weight up to 5,000,000 low molecular weight cationic organic polymer, moulding on the net and discharge suspension then.
The specific embodiment
According to the present invention, found before on forming web, dewatering and form gauze, in a particular manner additive to be joined in the paper stock at paper stock, can reduce the pitch problem.This discovery is specially adapted at the paper technology that has papermaking on the paper machine of dilution headbox.Also find to control better the pitch deposition of paper manufacturing systems according to the present invention.Further discovery papermaking process of the present invention can be produced the paper with improved performance.
Dilution headbox can refer to such equipment usually, comprise that at least one is used for the charging aperture of first's volume fluid, at least one is used for the charging aperture of second portion volume fluid, at least one is used to mix each several part volume fluid to form the zone of mixed volume fluid, reaches at least one and is used to spray the discharging opening of mixed volume fluid.Preferred dilution headbox comprises a plurality of such charging aperture, zone and the discharging opening across working width.The example of suitable dilution headbox comprises those in U.S. Patent No. 4,909, and is disclosed in 904,5,196,091,5,316,383,5,545,293 and 5,549,793.
Term used herein " main aqueous fluid " is meant the main paper stock fluid that comprises any filler of cellulose fiber peacekeeping that enters head box, and this fluid has high-consistency (calling HC in the following text), i.e. therefore high solids content, HC paper stock represent high-consistency fluid (calling the HC fluid in the following text).The denseness of HC fluid can be in the scope of 0.1wt%～3.5wt%, and desired value is 0.3wt%～2.2wt%, is preferably 0.4wt%～1.9wt%.Term used herein " dilution aqueous fluid " is meant the aqueous fluid that is used to dilute the HC fluid, compares with the HC fluid, and it has low denseness (LC), i.e. low-solid content, LC paper stock be the low denseness fluid (calling the LC fluid in the following text) of representative therefore.The denseness of LC fluid can be in 0wt%～1.5wt% scope, and desired value is 0.002wt%～0.9wt%, is preferably 0.005wt%～0.8wt%, and additional conditions are low than HC fluid of the denseness of LC fluid.Preferably, in head box, for example just before turbulent flow generator, diluted to form the gained fluid thereby the HC fluid mixes with the LC fluid, this gained fluid is discharged on the forming web and dewaters.The volume ratio of HC fluid and LC fluid can be at 99: 1～50: 50, and desired value is 97: 3～60: 40, are preferably 95: 5～75: 25, and representative value is about 85: 15.As conventional in the dilution headbox design, the HC fluid is preferably different so that regulate amount of dilution on a plurality of points across the head box width with the volume ratio of LC fluid, thereby controls the basis weight of formed gauze profile better.Preferred partial volume fluid, promptly the HC fluid mixes in head box with formation gained HC/LC mixed volume fluid with the LC fluid, and this fluid sprays from head box and along the paper machine cross substantial constant.
The moisture LC fluid that is used for diluting can be selected from the other types aqueous fluid of fresh water, plain boiled water and production process reuse.Dilution LC fluid can comprise fine fibre and filler, and can handle with any means of purification before injecting head box.The example that can be used for the appropriate steps of purifying or clarification the above-mentioned type fluid comprises filtration, flotation, deposition, anaerobism and aerobic processing.Preferred LC fluid is to comprise cellulose fine fibre for example, extract and other materials of discharging from timber in the pulp manufacture process and enter into the HC fluid but be not retained in filler on the forming web and the plain boiled water of other additives.Employed plain boiled water is preferably dewatered on forming web by paper stock and/or l Water Paper net and obtains, and can carry out clarifying treatment as mentioned above before injecting dilution headbox.The composition of LC fluid is different with the HC fluid usually.When using filler in technology, the content of filler in the LC fluid is different with in the HC fluid usually; Percentage with dry in the fluid represents that the filer content in the LC fluid is usually than the filer content height in the HC fluid.
Except HC fluid and LC fluid as previously mentioned enter the head box, can also have at least an other fluid to enter into head box according to the present invention.Other fluid preferably only comprises the fluid of water.Other fluid can also be paper stock stream or pulp stream, and the denseness of this fluid and/or composition are different with the HC fluid.
The retained fraction that joins the HC fluid among the present invention can be independent retention agent or reservation system, any in the kind that for example limits later.Independent component can be any component of serving as retention agent, preferred cationic polymer, any as in the kind that limits later.In this embodiment, the addition of this component in main aqueous fluid should be sufficient so that do not give better reservation with the situation phase specific energy of not adding this component.
In a preferred embodiment of the invention, used a kind of reservation system.Term used herein " reservation system " is meant two or more components or reagent, when they are joined in the paper stock, compares with the situation of not adding above-mentioned two or more components or reagent, can give better reservation.The component of preferred reservation system is selected from two or more organic polymers and one or more organic polymers that mixes with aluminium compound and/or inorganic particles.
In a preferred embodiment of the invention, used a kind of particulate to keep system.Term used herein " particulate reservation system " is meant and comprises a kind of microparticle material, or particulate, the reservation system of anionic inorganic particles, CATION inorganic particulate and the organic fine particles that limits as this paper.Microparticle material and at least a other components, the organic polymer that common at least a this paper also is known as host polymer mixes use, preferred cationic, both sexes or anionic polymer.Anionic microparticles preferably mixes use with at least a both sexes and/or cationic polymer, and cationic microparticles preferably mixes use with at least a both sexes and/or anionic polymer.Preferred particulate is an anionic inorganic particles.The further preferred particulate of its particle diameter in the colloidal state scope.The reservation system can comprise two or more components as the system that contains particulate, for example can be that three components or four components keep system.For example, other suitable components comprise aluminium compound and low molecular weight cationic organic polymer.Usually, the reservation system comprises that particulate keeps system, compares with the situation of not adding these components, can give better dehydration, and this system also usually is known as reservation and dewatering system.
In another preferred embodiment of the present invention, use the reservation system that comprises one or more cationic organic polymers and one or more anionic organic polymer.Suitable this reservation system comprises the cationic organic polymer with one or more aromatic groups that limits as this paper and/or has the anionic organic polymer of one or more aromatic groups.
According to the present invention can with anionic inorganic particles comprise anionic silica-based particles and smectites clay.The preferred anionic silica-based particles of using is promptly based on SiO
2Or the particle of silicic acid, comprise colloidal silica and various types of poly-silicic acid and polysilicate.Anionic silica-based particles generally all is the form supply with aqueous colloidal dispersion, promptly so-called colloidal sol.The silica-based sols suitable according to the present invention can also comprise other element, for example nitrogen, aluminium and boron.These elements can be owing to using the modification of the organic compound, aluminum contained compound and the boron-containing compound that contain organic nitrogen to exist respectively.These compounds can exist in liquid colloidal sol and/or silica-based particles.The reservation and the dewatering system that comprise suitable anionic silica-based particles are disclosed in U.S. Patent No. 4,388, and 150,4,927,498,4,954,220,4,961,825,4,980,025,5,127,994,5,176,891,5,368,833,5,447,604,5,470,435,5,543,014,5,571,494,5,584,966,5, in 603,805 and 6,379,500, be incorporated herein its full content as a reference.
The average grain diameter of anionic silica-based particles is suitable to about 50nm, preferably less than about 20nm 1～10nm more preferably from about also.As traditional in the silica chemistry, particle diameter refers to the average-size of elementary particle, and it may be to assemble or non-state of aggregation.The specific area of silica-based particles is suitable to 5m
2/ g also is preferably greater than 100m
2/ g.Usually, specific area is up to about 1700m
2/ g and preferred the highest 1000m
2/ g.suitably remove or regulate any be present in the sample and might disturb the element or compound of the similar aluminium of titration and boron after, record specific area by known method through the NaOH titration, such as analytical chemistry (Analytical Chemistry) 28 (1956): 12 referring to Sears, 1981-1983 and U.S. Patent No. 5,176,891.The average specific surface area of the cartographic represenation of area particle of gained thus.
In a preferred embodiment of the invention, anionic inorganic particles is that specific area is 50～1000m
2/ g, preferred 100～950m
2The silica-based particles of/g.The preferred anionic inorganic particulate is in the silica-based sols of S value 8～45%, in preferred 10～35% scopes, and it contains specific area is 300～1000m
2/ g, be suitably 500～950m
2The silica-based particles of/g, its particle can be non-aluminium modification or aluminium modification, the suitable aluminium surface modification of using.The S value can be by Iler ﹠amp; Dalton is in J.Phys.Chem.60 (1956), and the method described in the 955-957 is measured and calculated.Degree that the S value representation is assembled or microgel forms and S value are low to show that aggregation extent is higher.
In another one embodiment preferred of the present invention, anionic inorganic particles is selected from the poly-silicic acid that reacts with aluminium arbitrarily and have high-specific surface area, and specific area suits greater than about 1000m
2/ g.The specific area scope can be 1000～1700m
2/ g and preferred 1050～1600m
2/ g.In the prior art, poly-silicic acid also is called as polymeric silicicacid, poly-silicic acid microgel, polysilicate and polysilicate microgels, and all these are included among used here poly-silicic acid one speech.Contain the poly-silicic acid of aluminium and be commonly referred to as poly-aluminosilicate and poly-aluminosilicate microgel, the both is included among used here poly-silicic acid one speech.
Smectites clay available in the technology of the present invention is well known in the prior art, comprises natural existence, synthetic and through chemically treated material.The suitable example of smectites clay comprises imvite/bentonite, hectorite, beidellite, nontronite and talcum powder, and the preferred bentonite and its surface area of back that particularly expands are preferably 400～800m
2The bentonite of/g.Suitable clay is disclosed in United States Patent (USP) N0.4, in 753,710,5,071,512 and 5,607,552, is hereby incorporated by.Than the patent disclosure of back the mixture of anionic silica-based particles and the preferred natural montmorillonite of smectites clay.Operable CATION inorganic particulate comprises cationic silicon dioxide basal granule, cationic oxidation aluminium and cationic oxidation zirconium.
The suitable organic polymer that is used as the part of retention agent or reservation system according to the present invention can be anion, nonionic, amphion or CATION in nature, they can derive from natural or synthesis material, and they can be linear, branching or crosslinked is for example with the form of particulate.To preferably have organic polymer be water miscible or water is dispersible.
The example of suitable cationic polymers comprises cationic polysaccharide, as starch, guar gum, cellulose, chitin, chitosan, glycan, galactan, glucan, xanthans, pectin, mannosan, dextrin, preferred starch and guar gum, suitable starch comprises potato, corn, wheat, tapioca, rice, waxy maize, barley etc.; CATION synthetic organic polymer such as CATION chain growth polymerization thing, as cationic ethylene based addition polymer such as acrylate-, acrylamide-, vinylamine-, vinylamide-and allylamine based polyalcohol, with CATION step-growth polymerization thing, as cationic polyamido amine, polyethylene imine based, polyamine and polyurethane.Cationic starch and cation acrylamide based polyalcohol are particularly preferred cationic polymers, and the both can be separately as retained fraction, and in the reservation system that contains or do not contain anionic inorganic particles.The suitable example of cationic organic polymer that has one or more aromatic groups comprises those disclosed among the WO02/12626.The weight average molecular weight of cationic organic polymer can change in wide region, and this especially depends on the kind of used polymer, and generally is to surpass 2,000,000, more generally surpasses 3,000,000, surpasses 5,000,000 suitably.The upper limit is unimportant; It can be about 600,000,000, common 150,000,000 and suitable 100,000,000.
The example that can be added to the further suitable cationic polymers in the HC fluid according to the present invention comprises having low-molecular-weight cationic organic polymer.This cationoid organic polymer comprises those that are generally known as anion refuse agent for capturing (calling ATC in the following text).The weight average molecular weight of ATC cationic organic polymer is at least 2,000 usually, is at least 10,000 suitably, and preferably is at least 50,000, and it is usually up to 2,000,000, and generally up to 1,500,000.Proper A TC comprises linearity, branching or crosslinked polymer, and is normally highly charged, and they can derive from natural and synthesis material.The example of proper A TC comprises the low molecular weight degradation of polysaccharide, as based on those of starch, guar gum, cellulose, chitin, chitosan, glycan, galactan, glucan, xanthans, pectin, mannosan, dextrin, the polysaccharide of preferred starch and guar gum, suitable starch comprises potato, corn, wheat, tapioca, rice, waxy maize, barley etc.; CATION synthetic organic polymer such as CATION chain growth polymerization thing, as cationic ethylene based addition polymer such as acrylate-, acrylamide-, vinylamine-, vinylamide-and allylamine based polyalcohol, for example based on the homopolymers and the copolymer of poly (dially dialkyl) ammonium chloride, as diallyldimethylammonium chloride, reach homopolymers and copolymer based on (methyl) acrylamide and (methyl) acrylate; With CATION step-growth polymerization thing such as cationic polyamido amine, polyethylene imine based, polyamine for example dimethyl amine-epichlorohydrin copolymer and polyurethane.
Suitable example according to anionic organic polymer of the present invention can be selected from step-growth polymerization thing, chain growth polymerization thing, polysaccharide, naturally occurring aromatic polymer and modifier thereof.The example of suitable anion step-growth polymerization thing comprises anion phenyl and naphthyl condensation polymer, preferred naphthalene sulfonic acids base and naphthalene sulfonic acids alkali condensation polymer; And addition polymer, promptly by progressively increasing the polymer that addition polymerization obtains, as anion polyurethane.The example of suitable anion chain growth polymerization thing comprises the anionic vinyl addition polymer, as comprising the acrylate-based and acrylamide-based polymers of anion or potential anionic monomer, described monomer is as (methyl) acrylic acid with to vinylphenol (hydroxy styrenes).According to naturally occurring aromatic anionic polymers of the present invention and modifier thereof, it is the suitable example of the naturally occurring aromatic anionic polymers of modification, comprise the lignin-base polymer, preferred lignosulfonate is as lignosulfonates, brown paper lignin, sulfonation brown paper lignin and tannin extract.Other suitable examples of anionic organic polymer that have one or more aryl comprise those disclosed among the WO02/12626.The weight average molecular weight of anionic polymer can change in grace period, and this especially depends on the kind of used polymer, and usually at least about 500, surpasses about 2,000 and preferred above about 5,000 suitably.The upper limit is unimportant; It can be about 600,000,000, and is common 150,000,000, suitably 100,000,000 and preferred 10,000,000.
Term used herein " step-growth polymerization thing " is meant the polymer that obtains by the step-growth polymerization reaction, also is called step-reaction polymer and step-reaction polymerization respectively.Term used herein " chain growth polymerization thing " is meant the polymer that obtains by the chain growth polymerization reaction, also is called chain reaction polymer and chain reaction polymerization respectively.
The present invention can with aluminium compound comprise polymeric aluminum compound, the polymeric aluminum silicate-sulphate of alum, aluminate, aluminium chloride, aluminum nitrate and polymeric aluminum compound such as aluminium polychloride, polyaluminium sulfate, chloride and sulfate ion, and composition thereof.The polymeric aluminum compound also can contain other anion, such as the anion from phosphoric acid, sulfuric acid, organic acid such as citric acid and oxalic acid.
Comprise according to preferred reservation system of the present invention
(i) anionic silica-based particles and cationic starch, cation guar gum or the combination of cation acrylamide based polyalcohol are randomly with anion organic filler and/or ATC and/or aluminium compound combination;
(ii) anionic silica-based particles and anion chain growth polymerization thing, the combination of preferred anionic acrylamide-based polymers is with cationic organic polymer and/or ATC combination;
(iii) bentonite and cation acrylamide based polyalcohol combination is randomly with ATC and/or aluminium compound combination;
(iv) cationic polysaccharide, preferred cationic starch, with anion step-growth polymerization thing, the combination of preferred anionic naphthyl condensation polymer is randomly with ATC and/or aluminium compound combination;
(v) cationic polysaccharide is chosen cationic starch and naturally occurring aromatic anionic polymers and modifier thereof wantonly, and preferred lignosulfonate combination is randomly with ATC and/or aluminium compound combination;
(with anion step-growth polymerization thing, the combination of preferred anionic naphthyl condensation polymer is randomly with ATC and/or aluminium compound combination for vi) CATION chain growth polymerization thing, preferred cationic acrylamide-based polymers; And
(with naturally occurring aromatic anionic polymers and modifier thereof, preferred lignosulfonate combination is randomly with ATC and/or aluminium compound combination for vii) CATION chain growth polymerization thing, preferred cationic acrylamide-based polymers;
(viii) CATION chain growth polymerization thing, the preferred cationic acrylamide-based polymers makes up with ATC; And
(ix) CATION chain growth polymerization thing, the preferred cationic acrylamide-based polymers makes up with the anion organic filler.
In the technology of the present invention, preferably in head box retained fraction is joined in the HC fluid that mixes with the LC fluid, retained fraction enters into the gained aqueous fluid in dilution thus.When employing contained the reservation system of more than one components, each component can join in the paper stock fluid in a usual manner, preferably added at different points, and addition sequence can be any.When employing contains the reservation system of anionic inorganic particles and cationic polymer, preferably before microparticle material adds, cationic polymer is joined in the HC paper stock fluid, even can use opposite addition sequence.When employing contains the reservation system of CATION and anionic organic polymer, preferably before anionic polymer adds, cationic polymer is joined in the HC paper stock fluid, even can use opposite addition sequence.Further preferably before the shear stage that is selected from suction, mixing, cleaning etc., add first kind of component such as cationic polymer and after this shear stage, add second kind of component such as anionic inorganic microparticles or organic polymer.When adopting a kind of low molecular weight cationic organic polymer, preferably before other retained fractions or with other retained fractions, join simultaneously in the HC paper stock fluid as ATC.When adopting aluminium compound, preferably before other retained fractions or with other retained fractions, join simultaneously in the HC paper stock fluid.
Add to keep system component in paper stock to be drained off, its consumption can change in very wide scope, this especially get piece in the content of the type of the kind of the kind of component and quantity, paper stock, filler, filler, add point etc.The addition of component generally will guarantee, compares with the situation of not adding these components, can give better reservation.When adopting the anionic inorganic particulate as microparticle material, based on the dry of paper stock, its total addition is at least 0.001wt.% usually, generally is at least 0.005wt.%.The upper limit is generally 1.0wt.% and is suitably 0.6wt.%.When adopting anionic silica-based particles, total addition is suitably 0.005～0.5wt.%, and preferred 0.01～0.2wt.% is with SiO
2Calculate and based on the paper stock material of doing.The total addition level of organic polymer such as CATION and anionic polymer is at least 0.001% usually, generally is at least 0.005wt.%, based on the paper stock material of doing.The upper limit is generally 3.0% and be suitably 1.5wt.%.When adopting the low molecular weight cationic organic polymer as ATC, its amount of adding in the HC paper stock fluid is at least 0.01%, and the scope of suitable consumption is 0.05～0.5%, based on the paper stock material of doing.When having adopted aluminium compound in the technology, the total amount that joins in the paper stock to be drained off depends on the type of used aluminium compound and wishes other effect that it can play.Such as the known precipitating agent that utilizes aluminium compound as the abietyl cementing agent in the prior art.Total addition generally is at least 0.05%, with Al2O3 calculating and based on the paper stock material of doing.Suitable amount ranges is 0.08～2.8%, preferred 0.1～2.0%.
According to the present invention, preferably in dilution headbox, the low molecular weight cationic organic polymer is joined in the LC fluid that mixes with the HC fluid.Suitable low molecular weight (calling LMW in the following text) cationic organic polymer comprises linearity, branching or crosslinked polymer, and is normally highly charged, and they can derive from natural or synthesis material.The example of suitable LMW cationic organic polymer comprises the LMW degradation of polysaccharide, as based on those of starch, guar gum, cellulose, chitin, chitosan, glycan, galactan, glucan, xanthans, pectin, mannosan, dextrin, preferred starch and guar gum, suitable starch comprises potato, corn, wheat, tapioca, rice, waxy maize, barley etc.; LMW CATION synthetic organic polymer such as CATION chain growth polymerization thing, as cationic ethylene based addition polymer such as acrylate-, acrylamide-, vinylamine-, vinylamide-and allylamine based polyalcohol, as homopolymerization and copolymer, reach homopolymerization and copolymer based on (methyl) acrylamide and (methyl) acrylate based on poly (dially dialkyl) base ammonium halide such as diallyldimethylammonium chloride; With LMW CATION step-growth polymerization thing such as cationic polyamido amine, polyethylene imine based, polyamine for example dimethyl amine-epichlorohydrin copolymer and polyurethane.The weight average molecular weight of LMW cationic organic polymer is generally at least 100,000, is at least 500,000 suitably, and preferably is at least 1,000,000, and usually up to 5,000,000, suitably up to 3,000,000, and preferably up to 2,000,000.Usually, under situation about cationic organic polymer being joined as retention agent or the part that keeps system in the HC fluid, the weight average molecular weight that joins the IMW cationic organic polymer in the LC fluid will be lower than the weight average molecular weight that joins the cationic organic polymer in the HC fluid.
The amount that the LMW cationic organic polymer joins in the LC fluid usually is at least 0.01%, based on paper stock dry to be drained off.Suitable amount ranges is 0.05～1.0%, preferred 0.1～0.5%.
In a preferred embodiment of the invention, the LC fluid that contains the LMW cationic organic polymer added be blended in the HC fluid that contains one or more retained fractions, in the gained aqueous fluid, no longer add other retained fractions to form after the gained aqueous fluid.The gained aqueous fluid preferably forms in dilution headbox, but also can form outside head box.
Technology of the present invention is applicable to all paper technologies and cellulosic suspension, is specially adapted to make paper with the paper stock of high conductivity.In this case, the conductance of the paper stock that dewaters on forming web is at least about 1.5mS/cm, suits to be at least 3.5mS/cm, preferably is at least 5.0mS/cm.Conductance can be measured by the WTW LF539 type device that standard device such as Christan Berner make.The conductance that is ejected into the gained aqueous fluid that dewaters on the forming web by mensuration obtains the above-mentioned numerical value of mentioning.The high conductivity level shows salt (electrolyte) content height, and it is derived from usually in order to the material that forms paper stock, the various additives of introducing in paper stock, the fresh water etc. that is supplied to technology.In addition, its salt content is all higher usually in the technology that plain boiled water extensively circulates, and this can cause salt accumulation in a large number in the recirculated water of technology.
The present invention comprises further that plain boiled water fully circulates or the paper technology of recirculation, be plain boiled water height sealing, use 0～30 ton of fresh water such as made dried paper per ton wherein, paper per ton generally is less than 20 tons, suitable be less than 15 tons, preferably be less than 10 tons and be less than 5 tons of fresh waters especially.Fresh water can be introduced in the technology in any stage; Can mix with cellulose fibre forming suspended substance such as fresh water, fresh water can also mix with the concentrate suspension that contains cellulose fibre so that it is diluted to form as high viscous fluid and joins thin suspended substance in the head box.
Technology of the present invention is used for papermaking." paper " of term used herein not only comprises paper and goods thereof certainly, also comprises other mesh products such as plate and cardboard and goods thereof.This technology can be used for making paper with the dissimilar suspended substances that contain the pricker cellulose fiber, and suspended substance should contain 25wt.% and preferred this fibrid of 50wt.% at least at least aptly, based on the material of doing.Suspended substance can be based on the fiber of the ground wood pulp that forms from chemical pulp such as sulfate and sulfite pulp, thermodynamics paper pulp, chemical thermodynamics paper pulp, organosol paper pulp, ground wood pulp or by hardwood and cork, or derive from the fiber of annual plant such as napier grass, sugarcane, flax, straw etc., and can be used for suspended substance based on recycled fiber.The present invention preferably is applicable to the technology that contains wooden suspended substance papermaking.Inorganic filler such as kaolin, potter's clay, titanium dioxide, gypsum, talcum and natural and synthetic calcium carbonate such as chalk, marble powder, powdered whiting and the precipitation method calcium carbonate that also can contain common type in the suspended substance.The additive for paper making that can also comprise common type in the paper stock certainly, such as wet strength agent, as paper stock setting agent (stocksizes) based on rosin, ketene dimer, ketenes polymer and alkene butanedioic acid acid anhydrides etc., or the like.
The present invention be applicable to produce contain wooden paper and based on as the paper machine of the paper of the recycled fiber of SC, LWC and various types of books and newsprint and the paper machine of no block printing of production and writing paper, term does not have wood and is meant that containing xylon is less than about 15%.The present invention also is applicable on the individual layer paper machine and produces sheet material, can produce sheet material on the machine that produce paper or sheet material in the multilayer head box with on the paper machine with a plurality of head boxs again, and wherein one or more layers is made up of recycled fiber basically.In the paper machine that adopts multilayer head box or a plurality of head boxs, wherein one or more layers all by the head box production of dilution type, the present invention is applicable to one or more these layers.The suitable running speed of paper machine of the present invention is preferably 1000～2000m/min in the scope of 300～2500m/min.
The present invention is further described in following embodiment, but it is not construed as limiting.Except as otherwise noted, umber and % represent parts by weight and wt.% respectively.
Embodiment
Method of the present invention is tested as LC paper stock additive by adopting different LMW cationic organic polymers.
Produce paper and make the SC level having on the paper machine of dilution headbox with cellulosic suspension.Retention agent is added in the HC paper stock; At first add 0.8kg/ton and be about dimethyl amine-epichlorohydrin copolymer of 100 ten thousand, and then to add 0.36kg/ton be 4.6 hundred ten thousand cationic polyacrylamide based on the weight average molecular weight of siccative based on the weight average molecular weight of siccative.The LC paper stock is obtained by the paper stock draining.
Dynamically adding 500ml LC paper stock in row's filter tank (Dynamic Drainage Jar), and mixing 15 seconds, the LMW cationic organic polymer is being joined in the paper stock mixed 30 seconds afterwards with the speed of 1000rpm.For blank test, dynamically adding the LC paper stock and, do not adding the LMW cationic organic polymer in row's filter tank with 1000rpm speed mixing 45 seconds.Resulting LC paper stock is then arranged filter, and filter liquor is collected and the filter by 1 micron.The Ocean Optics S2000 UV spectrophotometric determination that employing has a quick sweep speed represents to leach the UV absorption value of fraction medium pitch content.
Several LMW cationic organic polymers are tested with identical dried dosage (4kg/ton based on LC paper stock dry, corresponding to about 2kg/ton based on total dried reel material tonnage), and the result is as follows.
LMW-1 is that weight average molecular weight is about dimethyl amine-epichlorohydrin copolymer of 120,000;
LMW-2 is that weight average molecular weight is about 1,000, dimethyl amine-epichlorohydrin copolymer of 000;
LMW-3 is that weight average molecular weight is about 680,000 diallyl dimethyl ammoniumchloride;
LMW-4 is that weight average molecular weight is about 1,800,000 diallyl dimethyl ammoniumchloride;
Compare with blank test, show that according to all technologies of the present invention the UV absorption value reduces.The most effective technology of the present invention is to use weight average molecular weight to be about 1,800,000 diallyl dimethyl ammoniumchloride.
Test result is summarised in the table 1, shown according to technology of the present invention with corresponding to the UV absorption value of blank test under different wave length of prior art.
Table 1: the UV absorption value of different wave length
| The UV absorption value | |||||
| Wavelength nm | Blank | LMW-1 | LMW-2 | LMW-3 | LMW-4 |
| 241.21 | 2.68 | 2.656 | 2.683 | 2.636 | 2.647 |
| 244.96 | 2.707 | 2.744 | 2.707 | 2.671 | 2.657 |
| 248.7 | 2.705 | 2.61 | 2.603 | 2.499 | 2.454 |
| 252.44 | 2.586 | 2.427 | 2.403 | 2.296 | 2.243 |
| 256.18 | 2.555 | 2.345 | 2.352 | 2.228 | 2.156 |
| 259.91 | 2.575 | 2.376 | 2.37 | 2.255 | 2.181 |
| 263.64 | 2.607 | 2.454 | 2.441 | 2.328 | 2.293 |
| 267.37 | 2.692 | 2.545 | 2.567 | 2.488 | 2.438 |
| 271.1 | 2.728 | 2.666 | 2.649 | 2.588 | 2.575 |
| 274.82 | 2.71 | 2.682 | 2.66 | 2.642 | 2.623 |
| 278.54 | 2.687 | 2.706 | 2.666 | 2.64 | 2.633 |
| 282.26 | 2.654 | 2.653 | 2.639 | 2.621 | 2.596 |
| 285.97 | 2.634 | 2.59 | 2.582 | 2.534 | 2.496 |
| 289.68 | 2.476 | 2.331 | 2.318 | 2.212 | 2.164 |
| 293.39 | 2.05 | 1.838 | 1.823 | 1.715 | 1.661 |
| 297.09 | 1.672 | 1.463 | 1.453 | 1.359 | 1.31 |
| 300.8 | 1.433 | 1.239 | 1.23 | 1.144 | 1.101 |
| 304.49 | 1.284 | 1.104 | 1.096 | 1.017 | 0.98 |
| 308.19 | 1.172 | 1.005 | 0.998 | 0.927 | 0.892 |
| 311.88 | 1.073 | 0.916 | 0.91 | 0.844 | 0.813 |
| 315.57 | 0.97 | 0.826 | 0.817 | 0.757 | 0.73 |
| 319.26 | 0.868 | 0.733 | 0.727 | 0.673 | 0.648 |
| 322.94 | 0.768 | 0.643 | 0.638 | 0.589 | 0.567 |
| 326.62 | 0.672 | 0.558 | 0.553 | 0.509 | 0.49 |
| 330.3 | 0.576 | 0.473 | 0.468 | 0.431 | 0.415 |
Claims (13)
1, a kind of in the method that has papermaking on the paper machine of dilution headbox, it comprises:
(i) one or more retained fractions are joined in the main aqueous fluid that contains cellulose fibre, and resulting main aqueous fluid is injected in the dilution headbox;
(ii) with weight average molecular weight up to 5,000,000 low molecular weight cationic organic polymer joins in the dilution aqueous fluid, and resulting dilution aqueous fluid is injected in the dilution headbox;
(iii) in head box, mix resulting main aqueous fluid and dilution aqueous fluid to form the gained aqueous fluid; And
(iv) above-mentioned gained aqueous fluid is sprayed onto on the forming web, and the gained aqueous fluid is dewatered to form gauze.
2, a kind of papermaking process, it comprises:
(i) provide the main aqueous fluid that comprises cellulose fibre;
(ii) one or more retained fractions are joined the main aqueous fluid that comprises one or more retained fractions in the described main aqueous fluid with formation;
The dilution aqueous fluid (iii) is provided;
(iv) the low molecular weight cationic organic polymer is joined the dilution aqueous fluid that comprises the low molecular weight cationic organic polymer in the described dilution aqueous fluid with formation, the weight average molecular weight of described low molecular weight cationic organic polymer is up to 5,000, and 000;
(v) the above-mentioned dilution aqueous fluid that comprises the low molecular weight cationic organic polymer is joined in the main aqueous fluid that comprises one or more retained fractions to form the gained aqueous fluid; And
(vi) above-mentioned gained aqueous fluid is sprayed onto on the forming web, and the gained aqueous fluid is dewatered to form gauze.
3, a kind of usefulness contains the method for the aqueous suspension papermaking of any filler of cellulose fiber peacekeeping, it comprises one or more retained fractions is joined in the suspension, then in suspension, add weight average molecular weight up to 5,000,000 low molecular weight cationic organic polymer, moulding on the net and discharge suspension then.
4, as the method for claim 1 or 2, wherein main aqueous fluid has the denseness than dilution aqueous stream height.
5, as claim 1,2 or 4 method, wherein diluting aqueous fluid is the plain boiled water that the dehydration of gained aqueous fluid obtains.
6, as each method of above-mentioned claim, wherein retained fraction is selected from by particulate and keeps system and contain the group that the reservation system of at least two kinds of organic polymers is formed.
7, as each method of above-mentioned claim, wherein retained fraction comprises at least a cationic organic polymer and anionic silica-based particles.
8, as each method of above-mentioned claim, wherein retained fraction comprises cationic organic polymer, and this cationic polymer is cationic starch or cation acrylamide based polyalcohol.
9, as each method of above-mentioned claim, wherein the weight average molecular weight of low molecular weight cationic organic polymer is 500,000～3, in 000,000 the scope.
10, as each method of above-mentioned claim, wherein the low molecular weight cationic organic polymer is based on the homopolymers or the copolymer of diallyldimethylammonium chloride.
11, as each method of above-mentioned claim, wherein retained fraction comprises at least a organic polymer that contains one or more aromatic groups.
12, as each method of above-mentioned claim, wherein the method machine speed of being included in 300～2500m/min is produced paper down.
13, as each method of above-mentioned claim, wherein the method comprises circulation plain boiled water and adds fresh water corresponding to 0～30 ton on the dried paper of making per ton.
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| Application Number | Priority Date | Filing Date | Title |
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| US46901003P | 2003-05-09 | 2003-05-09 | |
| US60/469,010 | 2003-05-09 | ||
| EP03445057.7 | 2003-05-14 |
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| CN (1) | CN1784525A (en) |
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| US7955473B2 (en) * | 2004-12-22 | 2011-06-07 | Akzo Nobel N.V. | Process for the production of paper |
| US20060254464A1 (en) | 2005-05-16 | 2006-11-16 | Akzo Nobel N.V. | Process for the production of paper |
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| US7604715B2 (en) * | 2005-11-17 | 2009-10-20 | Akzo Nobel N.V. | Papermaking process |
| WO2007058609A2 (en) * | 2005-11-17 | 2007-05-24 | Akzo Nobel N.V. | Papermaking process |
| WO2007078245A1 (en) | 2005-12-30 | 2007-07-12 | Akzo Nobel N.V. | A process for the production of paper |
| US8273216B2 (en) | 2005-12-30 | 2012-09-25 | Akzo Nobel N.V. | Process for the production of paper |
| FI122734B (en) * | 2007-05-21 | 2012-06-15 | Kemira Oyj | Process chemical for use in the manufacture of paper or board |
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| US8613834B2 (en) | 2008-04-03 | 2013-12-24 | Basf Se | Paper coating or binding formulations and methods of making and using same |
| FI126046B (en) * | 2009-04-20 | 2016-06-15 | Elastopoli Oy | Composite intermediate and process for its preparation |
| WO2011120876A1 (en) * | 2010-03-29 | 2011-10-06 | Akzo Nobel Chemicals International B.V. | Process of producing a cellulosic fibre web |
| AU2011234697A1 (en) * | 2010-03-29 | 2012-09-06 | Akzo Nobel Chemicals International B.V. | Process of producing a cellulosic fibre web |
| DE102011088201B4 (en) * | 2011-12-10 | 2017-02-02 | Friedrich-Schiller-Universität Jena | Process water purification process in the paper industry |
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- 2004-04-30 ZA ZA200508659A patent/ZA200508659B/en unknown
- 2004-04-30 CN CNA2004800125406A patent/CN1784525A/en active Pending
- 2004-05-03 TW TW093112371A patent/TWI278555B/en not_active IP Right Cessation
- 2004-05-07 US US10/841,262 patent/US20040250972A1/en not_active Abandoned
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| ZA200508659B (en) | 2007-03-28 |
| US20040250972A1 (en) | 2004-12-16 |
| TW200426275A (en) | 2004-12-01 |
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