EP1029125A1 - Composition polymere permettant d'ameliorer les caracteristiques de retention, de drainage et de formation au cours de la fabrication du papier - Google Patents

Composition polymere permettant d'ameliorer les caracteristiques de retention, de drainage et de formation au cours de la fabrication du papier

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Publication number
EP1029125A1
EP1029125A1 EP99923105A EP99923105A EP1029125A1 EP 1029125 A1 EP1029125 A1 EP 1029125A1 EP 99923105 A EP99923105 A EP 99923105A EP 99923105 A EP99923105 A EP 99923105A EP 1029125 A1 EP1029125 A1 EP 1029125A1
Authority
EP
European Patent Office
Prior art keywords
furnish
paper
coagulant
cationic
flocculant
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP99923105A
Other languages
German (de)
English (en)
Other versions
EP1029125A4 (fr
Inventor
Vicente B. Lasmarias
Denis J. Walsh
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Imerys Minerals USA Inc
Original Assignee
ECC International Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ECC International Inc filed Critical ECC International Inc
Publication of EP1029125A1 publication Critical patent/EP1029125A1/fr
Publication of EP1029125A4 publication Critical patent/EP1029125A4/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/01—Separation of suspended solid particles from liquids by sedimentation using flocculating agents
    • 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
    • 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
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/37—Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates
    • D21H17/375—Poly(meth)acrylamide
    • 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
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/41—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups
    • D21H17/44—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups cationic
    • D21H17/45—Nitrogen-containing groups
    • D21H17/455—Nitrogen-containing groups comprising tertiary amine or being at least partially quaternised
    • 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
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/54—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen
    • D21H17/56—Polyamines; Polyimines; Polyester-imides
    • 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
    • D21H17/63—Inorganic compounds
    • D21H17/66—Salts, e.g. alums
    • 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
    • D21H23/04—Addition to the pulp; After-treatment of added substances in the pulp
    • D21H23/06—Controlling the addition
    • D21H23/14—Controlling the addition by selecting point of addition or time of contact between components
    • 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
    • D21H23/76—Processes or apparatus for adding material to the pulp or to the paper characterised by choice of auxiliary compounds which are added separately from at least one other compound, e.g. to improve the incorporation of the latter or to obtain an enhanced combined effect
    • D21H23/765—Addition of all compounds to the pulp

Definitions

  • the present invention relates to a cationic polymer composition
  • a cationic polymer composition comprising two coagulants one of which is a polyaluminum chloride silicate (PASS-C) and the other being selected from the group consisting of a polydadmac, a polyamine, a polyethylene imine, a polycyanogunidine, and a copolymer containing DMDAAC, and to a method using the composition for making paper or paperboard having improved properties in the areas of drainage, retention, and formation.
  • PASS-C polyaluminum chloride silicate
  • the cellulosic fibers are flocculated to a lesser degree, drainage and retention are less satisfactory; however, formation is improved. Further, drainage and retention are often in conflict with each other when, for example, increased production of paper or paperboard is desired over the need for retention of, such as for example, fillers and the like.
  • Retention is believed to be a function of different mechanisms such as filtration by mechanical entrainment, electrostatic attraction and bridging between aqueous cellulosic fibers and fillers. Because both cellulose and many common fillers are electronegative, they are mutually repellent and, in the absence of a retention aid, the only factor tending to enhance retention is mechanical entrainment.
  • Drainage relates to the rate at which free water is released from a sheet as it is being formed. Thus, it will be appreciated that drainage aids improve the overall efficiency of dewatering in the production of paper or paperboard.
  • Formation relates to the formation of the paper or paperboard sheet produced from the paper making process. Formation is generally evaluated by the variance in light transmission within a paper sheet. A high variance is indicative of poor formation. It is generally well known by those skilled in the art that as the retention level increases, the level of formation generally decreases from good formation to poor formation.
  • U.S. Patents Nos . 5,501,772; 5,501,773; 5,567,277; and 5,647,956 disclose a composition comprising an aqueous cellulosic furnish, a high molecular weight cationic polymer, and a modified lignin with a ratio of the cationic polymer to the modified lignin being from 10:1 to 1:10 on an active basis and a process employing this composition for making paper or paperboard having improved drainage, retention, and formation properties.
  • 5,149,400 discloses a novel polynucleate aluminum hydroxy silicate-sulphate compound (PASS) , which is especially useful as a drainage and retention aid and size promoter for use in paper making.
  • PASS aluminum hydroxy silicate-sulphate compound
  • a process for manufacturing this product is disclosed and claimed in U.S. Patent No. 5,296,213.
  • U.S. Patent No. 5,149,400 teaches that it has been found that PASS can be used as a replacement for alum (aluminum sulphate) used as a draining-retention aid in acidic paper making processes and as a draining-retention aid and size promoter in neutral and alkaline paper making processes, even though alum itself cannot be used in such processes.
  • cationic polymers or copolymers such as polyaluminum chloride, polyamines and polydadmac as a coagulant and a polyacrylamide as a flocculant at different feed points in the wet-end of a paper machine.
  • the present invention has met the above-described need.
  • the present invention provides a cationic polymer composition that can improve the retention of fillers, sizing and fiber fines in a paper making process, which speeds up drainage in the paper machine wire, and which improves sheet or paper formation which, in turn, enhances other physical and strength properties of the finished paper.
  • the cationic polymer composition of the invention comprises a blend of two coagulants, preferably a polydadmac or a polyamine with a polyaluminum chloride silicate (PASS-C) .
  • the ratio of polydadmac or polyamine to polyaluminum chloride silicate may range from 1:1 to 1:4 and 1:1 to 4:1.
  • the polymer blend is not considered as being shear-sensitive and, therefore, can be added to the pulp stock or slurry at any point in the wet-end of the paper machine.
  • This polymer composition may be used alone or in combination with a flocculant, preferably a polyacrylamide to enhance the dewatering or drainage efficiency.
  • the cationic polymer composition of the invention is added first to the pulp stock or slurry in the wet-end of the paper machine, followed by addition of the polyacrylamide. Since polyacrylamide is shear-sensitive, preferably, it is added to the pulp or slurry after the shearing stages in order to preserve its efficiency.
  • Other coagulants or polymers which may be used in conjunction with the polyaluminum chloride silicate
  • PASS-C are polyethylene imines, polycyanogunidines, or copolymers containing DMDAAC (dimethyldiallylammonium chloride) .
  • the paper and/or paperboard products are, for example, such products as newsprint, fine paper, and ' corrugated medium/board furnishes.
  • the present invention is directed to a cationic polymer composition for particular use in the wet-end of a paper machine in the paper making process.
  • a paper product that is paper or paperboard or the like, is made by the general steps of forming an aqueous cellulosic slurry, subjecting such slurry to at least one shear stage, and dewatering the slurry to form a paper product sheet, which process is characterized by unique steps concerning the sequence and point of addition of certain additives.
  • the process includes the addition of a mineral filler such as calcium carbonate, kaolin clay, or the like and a cationic charge biasing species (coagulants) to the slurry prior to at least one shear stage, which additions and points of addition are also generally known for paper making processes.
  • the dewatering of the slurry to form a paper product sheet generally comprises draining the slurry and then drying the sheet formed thereby.
  • a cationic or an anionic flocculant is also known generally in the paper making process.
  • a cationic species or coagulant is added to the slurry to at least partially neutralize the charge of the surfaces of the mineral filler and cellulosic fines and/or fibers larger than the fines. Most of all of the solids in nature have negative surface charges, including the surfaces of cellulosic fines and mineral fines.
  • the cationic species in addition to partially neutralizing the surface charge on the fines and fillers, provide cationic patches or anchoring points on the mineral and fines for the anionic flocculant subsequently added to the slurry.
  • the cationic polymer composition of the present invention has been found to work well as a cationic donor, i.e., providing cationic sites on the minerals and fines for the anionic flocculant and as a fixative for the colloidal fines as well as a drainage aid.
  • Visual observations on the floes formed indicate the composition's use as a possible formation aid in addition to acting as a colloidal fixative, an anionic trash neutralizer, and a drainage aid.
  • the cationic polymer composition of the invention comprises a blend of two coagulants where the first is a polynucleate aluminum silicate-sulphate compound containing a chloride referred to as PASS-C and the second coagulant is either a polyamine or a polydadmac (polydiallyldimethylammonium chloride) .
  • PASS-C polynucleate aluminum silicate-sulphate compound containing a chloride
  • the PASS-C product is available from Handy Chemicals Limited, (a subsidiary of Alcan Aluminum) and through Hydor-Tech, a licensed manufacturer of Handy Chemicals Limited.
  • the cationic polymer composition of the invention can be used in acidic, neutral, or alkaline paper making processes .
  • PASS-C contains a polyaluminum chloride silicate (PAC) component. It is believed by the inventors that this PAC component can be used as a sizing promoter to replace alum and that the presence of a cationic donor in the polydadmac or the polyamine should give better sizing efficiency than either of these chemicals when used alone as a coagulant in the paper making process.
  • PAC polyaluminum chloride silicate
  • Other cationic polymers used in the composition of the invention may be polyethylene imines, polycyanogunidines, or copolymers containing DMDAAC (dimethyldiallylammonium chloride) .
  • the ratio of the first coagulant to PASS-C may range from about 1:1 to 4:1.
  • PASS-C may have been used as a polymer in effluent water treatment but has never been used for the retention, drainage, and/or formation of paper products.
  • composition of the present invention should be employed in the paper making process. It will be appreciated by those skilled in the art that the dosage of the composition added to the aqueous cellulosic furnish being treated is dependent on the degree of retention, drainage, and formation desired.
  • At least about one pound of the cationic polymer composition of the invention per ton based on the dry weight of furnish should be added to the aqueous cellulosic furnish.
  • the term “furnish” refers to all paper and paperboard furnishes based on, for example, but not limited to, mechanical pulp, semi-bleached kraft pulp, unbleached kraft pulp, and/or unbleached sulfite pulp .
  • an "effective amount” refers to the amount of the cationic polymer composition of the present invention necessary to bring about the desired result, such as, for example, the amount needed to improve drainage, retention or formation in the manufacture of paper or paperboard.
  • the cationic polymer composition of the invention may be employed in conjunction with other additives used during the manufacture of paper or paperboard such as, but not limited to, fillers, pigments, binders, and strength aids.
  • the cationic polymer composition of the invention may be added to the paper furnish (pulp stock or slurry) at any convenient point prior to sheet formation.
  • the composition is added to thin diluted aqueous cellulosic paper furnish.
  • the cationic polymer composition is not shear-sensitive so that it can be added to the paper furnish at any point in the wet-end of the paper machine, including before any of the shear stages.
  • the cationic polymer composition of the invention is to be used in conjunction with an anionic or cationic flocculant, such as a polyacrylamide, since the flocculant is generally shear-sensitive, then preferably this flocculant is added after the shearing stages (i.e., screens) to preserve its efficiency with regard to drainage and fiber fines or filler retention. Also, if a flocculant is to be used with the cationic polymer composition of the present invention, then preferably the cationic polymer composition is added first to the paper furnish in the wet-end of the paper machine followed by the flocculant.
  • an anionic or cationic flocculant such as a polyacrylamide
  • Pulp Stock Pulp samples also known as “thick stock” were taken from various pulp lines in two commercial paper mills . Samples of tray water or “thin stock” were also collected and mixed with the thick stock in order to dilute the thick stock to attain the consistency needed in the headbox. The percent solids for each of the samples taken from the thick stock and the thin stock was determined based on the ratio of the weight of the oven- dry fibers to the total weight of the sample slurry. From the percent solids of the fiber in the thin and thick stock samples, the required weight of each sample slurry in order to obtain a target or "mix" consistency at the headbox is easily determined.
  • Each cationic donor i.e., PASS-C, polydadmacs, polyamines
  • the flocculants were first made down at 2% solids, and then to 0.1% solids with distilled water. The first step dilution to 2% solids "uncoils" the polymer thereby maximizing its efficiency. Further dilution to 0.2% or 0.1% is necessary not only to reduce polymer viscosity but also to attain a better mixing with the cellulose fibers. A 0.1% final solids was chosen for better precision since small samples were handled.
  • a Hach DR 100 instrument was used with distilled water as the reference. "Good” distilled water is essentially free of colloidal impurities.” This instrument measures transmittance at 450 NM wavelength.
  • Distilled water is placed in a vial and the transmittance reading is adjusted to 100.
  • the distilled water is then replaced by the sample and a reading is taken. This reading was recorded and is the transmittance percentage.
  • Cationic Demand Test (meq/L) A Mutek Particle Charge Detector (PCD) was used. 10 ml of the filtrate from the Calgon drainage tube of Step 4 was titrated until end-point with a 0.001 N standard polydadmac titrant . The 0.001 N (one equivalent wt . of solute per liter of solution) polydadmac titrant is an industry standard. The reading was multiplied by 100 in order to convert the reading into meq/L. The meq/L value represents the cationic demand of the system, or how much cationic polymer is required to neutralize the colloidal anionic trash or impurities in the system. A lower meq/L value indicates a more efficient polymer in trash neutralization. It is a relative value.
  • Thick stock 0 1100-1200 Add thick stock to a Ball jar
  • Coagulant is polyamine, polydadmac and/or PASS-C as shown in Examples
  • Flocculant is anionic or cationic as shown in Examples
  • Thick stock 0 1100-1200 Add thick stock to a Ball jar
  • Coagulant is polyamine, polydadmac and/or PASS-C as shown in Examples
  • Flocculant is anionic or cationic as shown in Examples
  • Hydraid ® 2010 is a high molecular weight polydadmac.
  • Hydraid ® 2060 is a high molecular weight polyamine.
  • Hydraid ® 2020 is a low molecular weight polydadmac.
  • Hydraid ® 2050 is a low molecular weight polyamine.
  • Hydraid ® 954 is a high charge, high molecular weight cationic flocculant.
  • Hydraid ® 7706 is a low charge, high molecular weight anionic flocculant.
  • Hydraid ® 7736 is a high charge, high molecular weight anionic flocculant.
  • Hydraid ® 8736 is a high charge, high molecular weight anionic flocculant.
  • ECCat TM 2900 is a polyaluminum chloride (PAC) .
  • Hydraid ® 7736 and 8736 is its chemistry of manufacture.
  • Hydraid ® is a registered trademark of Calgon Corporation, Pittsburgh, PA, U.S.A. These products are commercially available from Calgon Corporation
  • ECCat TM is a trademark of ECC International Inc., Roswell, GA.
  • PASS-C is a polyaluminum chloride silicate available from Handy Chemicals Limited or Hydor-Tech, Annacis Island, New Riverside, British Columbia, Canada
  • the coagulant is a blend of Hydraid ® 2020 and PASS-C with a 2:1 ratio
  • the ratio amounts are given on a volume basis.
  • the dosages of the chemicals are given in kilograms per ton based on the oven dry weight of the pulp fibers .
  • the cationic polymer composition of the invention was used in a newsprint (Examples A) , fine paper (Examples B) , corrugating medium/board furnishes (Example C) , and coated machine furnish (Example D) as exemplified in the several following examples.
  • the laboratory test procedure for each of the following examples was performed according to the procedure described hereinabove .
  • a newsprint furnish consisted of the following: 37% GWD (groundwood) , 25% CTMP (chemi-thermomechanical pulp) , 22% semi-bleached kraft, and 16% paper machine broke (some clay in broke) .
  • the paper furnish was diluted with machine white water to a 1% stock consistency with a stock pH of 5.2.
  • the dosages of the chemicals of Samples 2-7 were in kilogram (polymer) per ton of oven-dry fiber. These amounts are shown below.
  • the ratio amount of Hydraid 2050 to PASS-C in Sample 7 was 1:4 on a volume basis .
  • PASS-C can be used as a blend with Hydraid ® 2050 (a polyamine) and the blend performs similarly to the coagulants being used commercially.
  • the blend is particularly interesting due to the smaller floes formed which were observed visually. Smaller floes result in better sheet formation.
  • the work done in this example involved a two- component system which is generally applied in paper mills where the cationic donor acts as the coagulant and is added to the thick stock, and the flocculant is added to the thin stock. Addition of the coagulant and flocculant followed the procedure of Table 2.
  • the flocculant (Hydraid 954) was dosed at 0.5 kg/ton of over - dry fiber while the remaining chemicals (except the control sample) were dosed at 2.0 kg/ton of oven-dry fiber.
  • the paper furnish was the same as that in Example
  • Hydraid® 2010/954 54 160 10 Hydraid® 2020/954 59 120 11 Hydraid® 2050/954 58 120 12 Hydraid® 2060/954 62 120
  • the floes containing PASS-C appeared to be smaller and better distributed in the pulp stock as compared to the samples not containing PASS-C.
  • a PASS-C blend containing a high molecular weight polyamine e.g.2060
  • Example Al .3 This experiment was done to determine the best ratio between 2060 and PASS-C of Example Al .3 above.
  • the newsprint furnish was the same as that for Example Al .1 and the dosages were the same as that for Example Al .2 , i.e. 2.0 kg/ton of coagulant in the ratios shown below and 0.5 kg/ton of flocculant (954).
  • the results were:
  • Example Al .1 through Examples Al .4 above were conducted where both 2060 and PASS-C were made down to 1% solution and then mixed together.
  • Examples Al .1 through Al .5 involved a newsprint furnish without any fillers, the chemicals were added to the stock according to the procedure shown in Table 2 above.
  • the following Example A2.1 involved a newsprint furnish containing fillers and, thus, the chemicals were added according to the procedure of Table 1.
  • This experiment used the same newsprint furnish of Example Al .1 but included a commercial calcined clay filler.
  • the clay loading was 10% of the furnish.
  • Clay was first added to the stock followed by the coagulant and then the flocculant according to the procedure of Table 1.
  • the coagulant dosage or coagulant blend (dosage in ratios as shown) was 2 kg/ton, while the flocculant (954) dosage was 0.5 kg/ton of dry-oven fiber.
  • the results were: Cationic
  • the results may indicate that the polymer composition of the invention comprising 2060 polymer and PASS-C used m conjunction with the 954 flocculant (Samples 41-44) work best with the newsprint furnish containing clay.
  • Samples 39 and 43 may indicate that some 2060 polymer can be replaced with PASS-C and still produce equivalent fixation results, i.e., same transmittance of 55, but slightly lower charge neutralization effects, i.e., cationic demand of 110 meq/L (Sample 43) vs. 100 meq/L (Sample 39) .
  • the pulp stock containing the PASS-C visually exhibited smaller and more uniform floes than that not containing PASS-C.
  • a fine paper furnish consisted of 48% bleached softwood, 32% bleached hardwood, 12% coated broke, and 8% machine broke.
  • the thick stock had a consistency of 3.5% while the thin stock for dilution into the thick stock had a consistency of about 0.07%.
  • the final consistency after mixing the thick and thin stocks together was 0.45% which was the headbox consistency of the paper machine from which both stocks were taken.
  • the pH of the final stock was 7.6.
  • the adding of the chemicals into the stock was according to the procedure of Table 2. In view of the nature of this fine paper furnish, a cationic donor (coagulant) with a low molecular weight and a cationic flocculant with a low to medium charge and a low to medium molecular weight would be required.
  • Hydraid 2020 a polydadmac
  • 954 locculant
  • the ratios are shown in parenthesis next to the coagulant blends and the amounts are given next to the chemicals.
  • the amount of coagulant blend dosage was 0.5 kg/ton with a 2:1 ratio and the amount of 945 flocculant was 0.3 kg/ton.
  • the results were :
  • composition of the invention comprising a 2:1 ratio of 2020 with PASS-C in conjunction with the 945 flocculant (Sample No. 53) had the best performance in terms of drainage, transmittance, and cationic demand.
  • Example Bl.l The fine paper furnish of Example Bl.l was used with a precipitated calcium carbonate (PCC) filler.
  • the PCC was scalenohedral and was added at a 15% loading.
  • the sequence of addition was: PCC and coagulant to thick stock, and then dilution with the thin stock, and finally the flocculant (945) .
  • the results were: Cationic
  • composition of the invention comprising 2020 coagulant and PASS-C in conjunction with 945 flocculant (Sample 61) performed the best .
  • a coated machine furnish was used. This furnish consisted of 15% softwood, 45% hardwood, 10% coated broke, and 30% free broke.
  • the composition of the invention comprising PASS-C with either polydadmac (2010 - Sample 86) or polyamine (2060 - Sample 85) with a 4:1 volume ratio were used in polymer screening in conjunction with commercial polymers (Part 1) .
  • the coagulants were screened using thick stock and the best coagulant was then used with an anionic flocculant as indicated in Part 2.
  • the criteria for selecting the best coagulant was based on drainage time and anionic trash neutralization indicated by the negative PCD values, explained hereinabove .
  • the dosages are on a dry weight basis.
  • the results for Part 1 were:
  • ** PAC polyaluminum chloride which is the coagulant presently being used by this commercial paper mill.
  • the high charge/high weight coagulants (2010 and . 2060) produced relatively large floes which seemed to hinder drainage; however, when the 2010 coagulant was blended with PASS-C (Sample 86) , it produced the best drainage (8.5 sec/100 ml) and good charge neutralization (-146 PCD meq/L) when compared to the polyaluminum chloride (Sample 84) currently being used in the mill regardless of the higher dosage of the polyaluminum chloride, i.e., 11.5 lbs . /ton of PAC (Sample 84) vs. 2.5 lb. /ton of the blended PASS-C/2010 (Sample 86).
  • composition of the invention may be adequate for this mill application.
  • the PASS-C/2010 (Sample 86) blend was then used in combination with anionic flocculants and compared to the current retention aid program being used by the mill, which program includes the use of colloidal silica.
  • the blend of the invention was added at 2.5 lbs. /ton on a dry weight basis to thin stock before the flocculant was added. The results were:
  • the 7706, 7736, and 8736 are anionic flocculants.
  • Example E Experimental This experiment was performed to show the synergy between PASS-C and Hydraid 2010. Thick stock from the stuff box and machine white water samples were grabbed. Meanwhile, 1% polymer solutions were prepared from the following: Hydraid 2010 (high molecular weight polydadmac) , PASS-C and ECCat 2900 (PAC) . The required dosages of the polymers were added to a certain volume of the thick stock and the consistency of the stock was diluted to 1% bringing the total volume of the slurry to 500 ml. The schedule of mixing was as follows:
  • the coagulant composition of the invention comprising PASS-C with a polyamine or a polydadmac and a method of use of composition in a paper making process for making paper or paperboard significantly improve the parameters of drainage, retention and formation over known cationic polymer technology generally employing a single cationic polymer.
  • Other cationic polymers such as polyethylene imines, polycyanogunidines, and copolymers containing DMDAAC may also be used with the PASS-C.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Paper (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)

Abstract

L'invention se rapporte à une composition polymère cationique permettant d'améliorer les caractéristiques de rétention, de drainage et de formation de produits en papier et en carton. Ladite composition polymère cationique comporte au moins deux coagulants qui sont, pour le premier, un composé sulfate-silicate d'aluminium polynucléaire contenant une molécule de chlorure (PASS-C) et, pour le second, un coagulant sélectionné dans le groupe constitué par un polydadmac, une polyamine, une polyéthylène-imine, une polycyanogunidine et un copolymère contenant un chlorure de diméthyldiallylammonium (DMDAAC). Ces deux coagulants peuvent être mélangés et peuvent être ajoutés à la charge de pâte à papier, en n'importe quel point de la partie humide de la machine de fabrication du papier du fait que ladite composition polymère n'est pas sensible au cisaillement. Les rapports des deux coagulants dans le mélange peuvent être compris entre 1:1 environ et 1:4 environ et entre 1:1 environ et 4:1 environ. Cette composition polymère peut être utilisée seule au cours du processus de fabrication du papier ou elle peut être additionnée d'un floculant (polyacrylamide) servant à accroître l'efficacité de l'essorage. Ledit floculant est ajouté après les étapes de cisaillement et après l'addition de la composition polymère.
EP99923105A 1998-05-15 1999-05-14 Composition polymere permettant d'ameliorer les caracteristiques de retention, de drainage et de formation au cours de la fabrication du papier Withdrawn EP1029125A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US8565398P 1998-05-15 1998-05-15
US85653P 1998-05-15
PCT/US1999/010763 WO1999060209A1 (fr) 1998-05-15 1999-05-14 Composition polymere permettant d'ameliorer les caracteristiques de retention, de drainage et de formation au cours de la fabrication du papier

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EP1029125A1 true EP1029125A1 (fr) 2000-08-23
EP1029125A4 EP1029125A4 (fr) 2001-10-10

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EP (1) EP1029125A4 (fr)
AU (1) AU3995299A (fr)
NO (1) NO20003884D0 (fr)
WO (1) WO1999060209A1 (fr)

Families Citing this family (4)

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Publication number Priority date Publication date Assignee Title
US8088250B2 (en) 2008-11-26 2012-01-03 Nalco Company Method of increasing filler content in papermaking
CN103422395B (zh) * 2012-05-15 2016-03-02 纳尔科公司 在造纸中增强脱水、纸片湿纸幅强度和湿强度的方法
US9752283B2 (en) 2007-09-12 2017-09-05 Ecolab Usa Inc. Anionic preflocculation of fillers used in papermaking
MX2015017287A (es) * 2013-06-17 2016-04-06 Nalco Co Un metodo para mejorar la eficiencia de deshidratacion, aumentando la resistencia de la membrana humeda de la hoja, aumentando la resistencia de la hoja humeda y mejorando retencion de relleno en la produccion de papel.

Citations (3)

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Publication number Priority date Publication date Assignee Title
US4284611A (en) * 1979-07-25 1981-08-18 Allied Chemical Corporation Aqueous phosphate-stabilized polyaluminum sulfate solutions and preparation thereof
US5069893A (en) * 1988-11-03 1991-12-03 Handy Chemicals Limited Polymeric basic aluminum silicate-sulphate
US5516405A (en) * 1993-09-20 1996-05-14 Macmillan Bloedel Limited Retention aids

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SE446969B (sv) * 1983-12-09 1986-10-20 Olof Carlsson Sett att framstella ett flockningsmedel
US5098520A (en) * 1991-01-25 1992-03-24 Nalco Chemcial Company Papermaking process with improved retention and drainage
US5221435A (en) * 1991-09-27 1993-06-22 Nalco Chemical Company Papermaking process

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
US4284611A (en) * 1979-07-25 1981-08-18 Allied Chemical Corporation Aqueous phosphate-stabilized polyaluminum sulfate solutions and preparation thereof
US5069893A (en) * 1988-11-03 1991-12-03 Handy Chemicals Limited Polymeric basic aluminum silicate-sulphate
US5149400A (en) * 1988-11-03 1992-09-22 Handy Chemicals Ltd. Polymeric basic aluminum silicate-sulphate
US5516405A (en) * 1993-09-20 1996-05-14 Macmillan Bloedel Limited Retention aids

Non-Patent Citations (1)

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Title
See also references of WO9960209A1 *

Also Published As

Publication number Publication date
AU3995299A (en) 1999-12-06
WO1999060209A1 (fr) 1999-11-25
NO20003884D0 (no) 2000-07-28
EP1029125A4 (fr) 2001-10-10

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