CN1189623C - Papermaking process using hydrophilic dispersion polmers of diallyldi methyl ammonium chloride and acrylamide as retention and drainage aids - Google Patents

Papermaking process using hydrophilic dispersion polmers of diallyldi methyl ammonium chloride and acrylamide as retention and drainage aids Download PDF

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Publication number
CN1189623C
CN1189623C CNB998024716A CN99802471A CN1189623C CN 1189623 C CN1189623 C CN 1189623C CN B998024716 A CNB998024716 A CN B998024716A CN 99802471 A CN99802471 A CN 99802471A CN 1189623 C CN1189623 C CN 1189623C
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described method
polymer
paper
adds
monomer
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CN1289380A (en
Inventor
J·B·王·欣
J·R·赫洛克
C·马尔泰什
R·纳加拉扬
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ChampionX LLC
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Nalco Chemical Co
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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
    • 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
    • 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
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/24—Polysaccharides
    • D21H17/28—Starch
    • D21H17/29—Starch cationic
    • 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
    • D21H17/63—Inorganic compounds
    • D21H17/66—Salts, e.g. alums

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Paper (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)

Abstract

The present invention relates to a method for improving and reserving drainability in the process of making paper, which comprises: cellulose paper making pulp containing water is formed; an effective dose of hydrophilicity dispersion polymers are added to the pulp; the pulp is filtered to be drid to form paper, and the paper is dried. The hydrophilicity dispersion polymers are optimized to be the copolymers of allyl dimethylammonium chloride and acrylamide.

Description

With the hydrophily dispersed polymeres of diallyldimethylammonium chloride and acrylamide papermaking process as retention agent and filter aid
Invention field
Present invention relates in general to field of papermaking, more particularly, relate to diallyl-N, ammonium halide that the N-double-basis replaces and the hydrophily dispersed copolymer of (methyl) acrylamide are as the improvement papermaking process of retention agent and filter aid.
Background of invention
In making the paper process, moisture cellulose suspension or slurry are made paper.Cellulose paste is diluted into denseness (solid dry weight percentage in the slurry) usually and less than 1%, often be lower than 0.5%, and final paper must contains the water that is less than 6% (percentage by weight) before entering paper machine.Therefore, the syneresis of papermaking is particularly important to production efficiency and production cost.
The most cheap dewatering is a drainage, thereafter, has used expensive method, comprises that vacuum pressing, felt rug blot and suppress, evaporation etc., and any combination of these methods.Because drainage is the dewatering that uses at first, also be the most cheap, the improvement of dewatering efficiency will reduce the water yield with the required removal of additive method, and improve the overall efficiency of dehydration, thereby reduce its cost.
Another is to be retained on the fibrofelt that forms in the paper-making process and the furnish component in it to paper efficient and the very important aspect of cost.Papermaking batching contains magnitude range from about 2～3 millimeters cellulose fibre to the filler particles of several microns sizes only.In this scope is cellulose chip, mineral filler (being used to increase opacity, brightness and other paper performance) and other granule, usually do not comprise one or more retention agents, described retention agent can pass the space (hole) between the cellulose fibre in the fibrofelt that is forming.
A kind of cellulose chip, mineral filler and other furnish component of improving adds coagulating agent/flocculant system before the method for the retention on the fibrofelt is to enter paper machine.In this system,, add in the batching as low molecular weight cationic synthetic polymer or cationic starch at first with coagulating agent.Coagulating agent reduces in the batching on the particle usually, and particularly therefore the surface negative charge of cellulose chip and mineral filler makes these particle aggregations.Add flocculant behind the coagulating agent.Flocculant is high molecular weight cation or anion synthetic polymer normally, from a surface to another surperficial bridging particle and/or agglomerate, thereby particle is combined into big agglomerate.The appearance of these big agglomerates has increased retention in the batching.Agglomerate is leached into from water on the fiber web, and uncongealed particle then generally can pass through fiber web.
If batching forms jelly or contains gel-like substance, the agglomerate of flocculation does not reach the annoyance level to the fibrofelt drainage usually, and when this floccule was filtered by fiber web, had reduced in online hole, so reduced drainage efficient.Therefore, the increase of retention is a cost to reduce drainage.
As United States Patent (USP) 4,753,710 and 4,913,775 described systems have been used to provide the reservation of improvement and the combination of dehydration.Briefly, these patents require to add high molecular weight linear cationic polymer earlier in suspension before shearing aqueous cellulosic papermaking suspension, add bentonite then after shearing.Shearing is provided by one or more cleanings, mixing and the pumping stage of paper-making process usually.Shearing is broken into microfloc with the big flocculate that heavy polymer forms, and adds the POLARGEL NF particle then and further assembles.
Another is at U.S. Patent number 4,388, disclosed system in 150, in conjunction with using cationic starch and colloidal silica thereafter, by in and electric charge and the little grumeleuse of absorption increase the quantity of online reservation material.
U.S. Patent number 5,098,520 and 5,185,062 has told about a kind of dehydration method in the paper-making process of improving.
Although these previous systems are arranged, still need new method to use the hydrophily dispersed polymeres and keep and water filtering performance to improve, particularly need not to add unnecessary oil and surfactant, both are included in the back in conventional latex (latex) polymer.Here used " latex " is defined as contrary (inverse) water-in-oil emulsion polymer.Still need do not need the converter system introduce the dispersed polymeres of paper-making process with available simple apparatus for feeding.
Summary of the invention
Method of the present invention need form the aqueous cellulosic paper making pulp, adds the hydrophily dispersed polymeres of effective effect amount in this slurry, and the filter dry pulp is to form paper and dry paper.The hydrophily dispersed polymeres comprises:
I. cationic monomer diallyl-N, the disubstituted ammonium halide of N-, the substituting group in the wherein said disubstituted ammonium halide is selected from C 1-C 20Alkyl, aryl, alkylaryl and aralkyl and
Ii. second monomer of following molecular formula:
R wherein 1And R 2Be selected from hydrogen, C 1-C 10Alkyl, aryl and alkylaryl; R 3Be selected from hydrogen and methyl; R 4And R 5Be selected from C 1-C 10Straight or branched alkylidene and hydrogen; In the aqueous solution of multivalent anions salt, described polymerisation is to carry out under the condition that has dispersant to exist.
This method has been improved reservation and water filtering performance and need do not added unnecessary oil and surfactant.In addition, the used hydrophily dispersed polymeres of the present invention does not need changer system, and available simple apparatus for feeding imports paper-making process.
Detailed description of the invention
The present invention relates to a kind of improve in the paper-making process and keep and the method for water filtering performance, comprise forming the aqueous cellulosic paper making pulp, the hydrophily dispersed polymeres being added in the slurry, drains slurry with formation paper and subsequent drying paper.
Hydrophily dispersed polymeres of the present invention is diallyl-N, the copolymer of the disubstituted ammonium halide cationic monomer of N-and (methyl) acrylamide.Preferred copolymer is formed by diallyldimethylammonium chloride (DADMAC) and acrylamide (AcAm).Found that above-mentioned polymer has application advantage in paper-making process.Especially, with conventional cationic latex polymer phase ratio, hydrophily dispersed polymeres of the present invention keep with water filtering performance aspect demonstrate activity improvement or identical, and need not add unnecessary oil and surfactant.In addition, these polymer do not need changer system, and available simple apparatus for feeding imports in the paper-making process.
Another advantage is relevant with the mode that adds dispersed polymeres.In most cases, conventional at present water-soluble polymer can have been bought on market by powder type.Before use, polymer powder must be dissolved in the water-bearing media with practical application.Polymer expands in water-bearing media, the dispersed particles flocculation.In general, Chang Gui polymer is difficult in the water-bearing media and dissolves.On the contrary, dispersed polymeres of the present invention owing to itself characteristic, has been avoided the problem relevant with dissolving.
In addition, the copolymer that is formed by DADMAC and AcAm has superior flexibility, makes it can be used for independent polymer treatment, or as a component that needs the conventional bifunctional polymerizable object space case (program) of conventional coagulant and flocculant.
Dispersed copolymer of the present invention, be diluted with water to aqueous solution form if desired, can be advantageously used in the multiple technologies field, as the additive of flocculant, thickener, soil conditioner, adhesive, food additives, dispersant, detergent, medicine and cosmetics and other.
Monomer
Example 1 has been summarized the method that monomer component in varing proportions prepares copolymer, acid/acrylic amide type monomer and diallyl-N, and the proportion of the disubstituted ammonium halide of N-is from about 1: 99 to about 99: 1.To illustrate in greater detail below in order to two types the monomer that forms dispersed polymeres of the present invention.
About diallyl-N, the disubstituted ammonium halide of N-, the disubstituted of monomer whose can be C 1-C 20Alkyl, aryl, alkylaryl or aryl alkyl.In addition, each disubstituted can be different groups.For example, the halide of an expection is N-methyl-N-ethyl-N, the N-diallyl ammonium chloride.
It is a kind of that to use a halid special case be DADMAC.Preferably, in the copolymer amount of DADMAC from about 5 mole percents to about 30 mole percents.Diallyl-N, the ammonium halide, particularly DADMAC that the N-double-basis replaces also can be buied from various sources on market as everyone knows.Remove the chlorination beyond the region of objective existence, equilibrium ion is bromide, sulfate, phosphate, a hydrogen orthophosphate and nitrate and other also.A kind of method of preparation DADMAC is at U.S. Patent number 4,151, the existing detailed description in detail in 202.
About the acid/acrylic amide type monomer, (methyl) acrylamide monomer of replacement can be the alkyl of straight or branched.Applicable monomer includes but not limited to: ethylhexyl (methyl) acrylamide, lignocaine propyl group (methyl) acrylamide, dimethylamino hydroxypropyl (methyl) acrylamide, N-isopropyl (methyl) acrylamide, the N-tert-butyl group (methyl) acrylamide, C 1-C 10N-alkyl acrylamide, C 1-C 10N-alkyl methyl acrylamide, N-aryl acrylamide, N-aryl methyl acrylamide, N-aryl alkyl acrylamide, N-isopropyl (methyl) acrylamide, N,N-DMAA (methyl) acrylamide, C 1-C 10N, N-dialkyl group acrylamide, C 1-C 10N, N-dialkyl methyl acrylamide, N, N-diaryl acrylamide, N, N-diaryl Methacrylamide, N, N-diallyl alkyl acrylamide and N, N-two aralkyl Methacrylamides.The meaning of terminology used here " aralkyl " is to have benzyl and phenethyl." side (pendant) amine " refers to be connected in the NH of main polymer chain 2Group.
Multivalent anions salt
Multivalent anions salt is incorporated in the aqueous solution.According to the present invention, multivalent anions salt is suitably sulfate, phosphate or both mixtures.Preferred salt comprises ammonium sulfate, sodium sulphate, magnesium sulfate, aluminum sulfate, ammonium hydrogen phosphate, dibastic sodium phosphate and potassium hydrogen phosphate.In the present invention, each uses these salt with its aqueous solution form, concentration be 15% or more than.
Dispersant
Polymer dispersant is present in the anion salt aqueous solution of above-mentioned monomer polymerization reaction take place.Polymer dispersant is a kind of water soluble polymer cationic polymer, is preferably dissolved in the saline solution above-mentioned.According to the gross weight of hydrophily dispersed polymeres, the weight of the preferred polymer dispersant that uses is about 1-10%.Polymer dispersant is made up of 20% (molar percentage) or above cationic monomer unit, ammonium halide or N that this cationic monomer unit replaces for the diallyl double-basis, N-dialkyl group-aminoethyl (methyl) acrylates and its quaternary salt.Preferably, remaining mole % is AcAm or (methyl) AcAm.The performance of dispersant is subjected to the influence of molecular weight little.But the molecular weight of dispersant is preferably about 10,000 to 10,000, between 000.Preferred dispersing agent comprises the homopolymers of diallyldimethylammonium chloride, dimethylaminoethyl acrylamide methyl chlorination quaternary salt and dimethylaminoethyl methacrylate methyl chloride quaternary salt.
According to one embodiment of the invention, multifunctional ethanol such as glycerine or polyethylene glycol exist in paradigmatic system jointly.Under the situation that has these ethanol, the deposition of fine particle is carried out reposefully.In addition, polysaccharide such as starch, glucan, carbomethoxy cellulose and amylopectin and other, also can be individually or in conjunction with other organic cation flocculant as stabilizing agent.
Dispersed polymeres
For polymerization, can use common water soluble group to form reagent, but preferably use water-soluble azo compounds as, 2, two (2-amidine propane) hydrochlorides and 2 of 2 '-azo, two (N, the N '-dimethylene isobutylamine) hydrochlorides of 2 '-azo.
According to one embodiment of the invention,, before beginning polymerization, above-mentioned monomer added crystal seed (seed) polymer for the dispersion that obtains.This seed polymer is a water-soluble cationic polymer, is insoluble to the aqueous solution of multivalent anions salt.The method that described seed polymer is preferably described with the present invention is by the polymer for preparing in the above-mentioned monomer mixture.Yet, the monomer of seed polymer form needn't be always with polymerization process in the monomer of the water-soluble cationic polymer that forms form identical.But the same with the water-soluble polymer that forms in the polymerization process, seed polymer should contain the diallyl dimethyl ammonium halide cationic monomer unit of 5 mole percents at least.According to an example of the present invention, the seed polymer that is used for a polymerisation is the water-soluble polymer for preparing in previous reaction, and identical monomer mixture is used in this reaction.
Method
At first, prepare aqueous cellulosic paper pulp with method arbitrary routine, that those skilled in the art generally know.Then the hydrophily dispersed polymeres is joined in the slurry.
The hydrophily dispersed polymeres is formed by the following monomer of polymerization:
I. diallyl-N, the ammonium halide cationic monomer that the N-double-basis replaces, the substituting group that wherein said double-basis replaces ammonium halide is selected from C 1-C 20Alkyl, aryl, alkylaryl and aralkyl and
Ii. second monomer of following molecular formula:
R wherein 1And R 2Be selected from hydrogen, C 1-C 10Alkyl, aryl and alkylaryl; R 3Be selected from hydrogen and methyl; R 4And R 5Be selected from by C 1-C 10One group of forming of straight or branched alkylidene and hydrogen; Described polymerisation is under the condition that has dispersant to exist, and carries out in the aqueous solution of multivalent anions salt.
Then with cellulose paper making pulp drainage to form paper and subsequent drying.Drainage and dry step can be carried out with method any routine, that those skilled in the art generally know.
Cationic monomer can be DADMAC, and second monomer can be AcAm.The hydrophily dispersed polymeres can have the cationic charge of an about 1mol% to about 50mol%.
In addition, although the effective active that must emphasize the reservation of this dispersion polymer and drainage without any need for additive, conventional coagulating agent, conventional flocculant, alum, cationic starch or their combination also can be used as the additive of this dispersion polymer.
Further, the inherent viscosity of hydrophily dispersed polymeres of the present invention is about 0.5 to about 10dl/g, is preferably about 1.5 to 8.5dl/g, most preferably from about 2.5 arrives about 7.5dl/g.According to the condition of specific plant, preferred dosage is a slurry solids per ton about 2.27 * 10 -2Active component to about 2.27 kilograms (about 0.05 to about 5.0 pounds).
Example
Below example be used for that the present invention will be described, how to prepare and use the present invention to teach those of ordinary skill.These examples also do not limit the present invention in any way or its protection domain.
Example 1
With the diallyldimethylammonium chloride of synthetic 30% mole of following manner and the dispersed copolymer of acrylamide.Poly-(DMAEA.MCQ) (dimethylaminoethyl acrylates methyl chloride quaternary salt with 25.667 gram 49.0% acrylamide solutions (0.1769 mole), 161.29 gram 62.0%DADMAC solution (0.6192 mole), 200 gram ammonium sulfate, 40 gram sodium sulphate, 303.85 gram deionized waters, 0.38 gram sodium formate, 45 grams 20%, IV=2.0dl/g) solution and 0.2 restrains in the resin reaction device of one two liters of EDTA addings, and this reactor is equipped with agitator, temperature controller and a water cooled condenser.Mixture heated to 48 ℃, add 2 of 2.50 grams 4%, 2 of two (2-amidine propane) dihydrochloride solution of 2 '-azo and 2.50 grams 4%, 2 '-azo two (N, N '-two time further reactions 2.5 hours.The cloth network gram Field viscosity that obtains polymeric dispersions is 3300cps.Adipic acid, 10 gram ammonium sulfate and 12.5 grams, the 60% thiosulfuric acid aqueous ammonium of 10 grams 99% are added in the polymeric dispersions.The cloth network gram Field viscosity of the dispersion that obtains is 1312.5cps, and contains the DADMAC and the AcAm copolymer 20% of 50% (percentage by weight), and it is at 1.0 moles of NaNO 3In inherent viscosity be 6.32dl/g.
Polymer that uses among the present invention and description separately thereof are summarized in the table 1.
Table 1
Dispersion I 130/70 mole of %DADMAC/AcAm RSV4 4.7dl/g
Other polymer 2
Polymer I 230/70 mole of %DADMAC/AcAm latex RSV 5.0dl/g
Polymer J 210/90 mole of %DMAEA.MCQ/AcAm latex RSV 15.2dl/g
Polymer K 21/99 mole of %DMAEA.MCQ/AcAm latex RSV 27.8dl/g
Polymer L 25/95 mole of %DMAEA.MCQ/AcAm latex RSV 24.8dl/g
Polymer M 210/90 mole of %DMAEA.MCQ/AcAm latex RSV 22.5dl/g
Polymer N 210/90 mole of %DMAEA.MCQ/AcAm dispersion RSV 18.6dl/g
Polymer O 210/90 mole of %DMAEA.BCQ/AcAm dispersion RSV 18.3dl/g
Polymer P 230/70 mole of %DMAEA.MCQ/AcAm latex RSV 17.5dl/g
Polymer Q 310/90 mole of %DMAEA.MCQ/AcAm dry polymer RSV 15.0dl/g
1According to example 1 synthetic (IV=4.4dl/g)
2Conventional treatment can be from the Illinois, and the Nalco chemical company of Naperville obtains
3Dry polymer can be from GA, and the Chemtall of Riceboro obtains
4RSV (reduced viscosity) measures under 0.045% the concentration in 1.0 molar nitric acid sodium.
Example 2
For determining to adopt following method according to the activity of the synthetic hydrophily dispersed polymeres of example 1.Estimate water filtering performance with vacuum drainage tester (VDT).The rare paper stock that is used for the VDT detection obtains at sample point from southern liner board (linerboard) paper mill, and sample point is just before the substrate flow box.Because do not use retention agent/filter aid on paper machine, rare paper stock tale quale is tested.
Batching in the Britt jar with the 1000rpm agitation treatment.The VDT test is carried out with normal step, and the batching that is about to handle is transferred in the VDT chamber, filters by Filpaco #716 paper under the vacuum of 15 inches of mercury (7.84psi) then.Test condition provides in Table II.Filtration rate was explained with the used time of the filtrate of collecting 100 ml volumes.
The cationic polymer scheme has shown the activity that substrate is prepared burden with respect to untreated sample (blank).Table III has shown the VDT drainage data of the polymer of listing in the table 1.Less drainage time (for 100 milliliters fixed volume) means higher filtration rate.Therefore, filtration rate is high more, handles effective more.Result in the Table III shows that hydrophily DADMAC/AcAm dispersed polymeres (dispersion I) is better than processed conventionally.And the water filtering performance of dispersion I is better than its latex analog, polymer I.In addition, the filtrate turbidity that obtains with dispersion I is obviously more clear than the polymer of other tests, and expression has reservation preferably.
Table II
The test condition that adopts unbleached liner board batching to carry out the polymer screening in southern paper mill
The product of polymer makedown 1% weight in the cage agitator 5～7 minutes is rare
Be interpreted as the product of 0.1% weight, all dilute with running water.
Dose of polymer 1ml=0.5lb/t
The canned vaned PRM DDJ of Britt (being used for the batching preparation)
Mixing speed 1000rpm
Single and the dual polymer program of time sequencing
Begin to stir
T=0 adds batching and coagulating agent second
T=10 adds flocculant second
T=20 stops to shift to VDT second
Vacuum drainage tester standard step adopts Filaco #716 filter medium and 15 inches
Mercury column (7.84psi) vacuum.
100 milliliters of times that filter liquor is required collected in record
Table III
The VDT water filtering performance of unbleached liner board batching cationic polymer scheme is adopted in the paper mill, south
Dosage 1.0lb/t Dosage 2.0lb/t
Table III
The VDT water filtering performance of unbleached liner plate batching cationic polymer scheme is adopted in the paper mill, south
Dosage 1.0lb/t Dosage 2.0lb/t
Scheme (program) 100 milliliters drainage time (second) 100 milliliters drainage time (second)
Blank (no polymer) 40.47 40.47
Dispersion I 19.78 16.78
Polymer I 24.87 18.18
Polymer J 28.59 19.46
Polymer K 26.56 18.58
Polymer L 31.25 15.21
Polymer M 36.65 19.87
Polymer N 33.40 26.50
Polymer O 39.59 31.37
Polymer P 38.37 28.59
Example 3
The experiment of a series of VDT drainages is to adopt hydrophily to disperse DADMAC/AcAm polymer (dispersion I) and rare paper stock of obtaining from hardboard paper mill, Midwest carries out.Batching in the Britt jar with the 1000rpm stir process.The VDT test is undertaken by normal step, and the batching that is about to handle is transferred in the VDT chamber, filters by Filpaco #716 paper under the vacuum of 15 inches of mercury (7.84psi) then.The condition of test is listed in the Table IV.
The results are summarized in Table V.Filtration rate was explained with the required time of the filtrate of collecting 400 ml volumes.The drainage time of collecting 400 milliliters of fixed volumes is few more, shows that performance is good more.The data of Table V have shown the flexibility of hydrophily dispersed polymeres, and in view of the above, it can be used alone as aggregation processing (flocculant) or use as coagulating agent in the dual schemes with conventional flocculant (polymer Q, polymer N).
Table IV
Use test condition from the hardboard batching screening polymer in paper mill, Midwest
The product of polymer makedown 1% weight is in the cage agitator, and dilution is 0.1% weight
The product of amount.
Dose of polymer 1ml=0.25lb/t
The canned vaned PRM DDJ of Britt (being used for the batching preparation)
Mixing speed 1000rpm
Single and the dual polymer program of time sequencing
Begin to stir
T=0 adds batching and coagulating agent second
T=10 adds flocculant second
T=20 stops the transfer to VDT second
Vacuum drainage tester adopts the Filaco #716 filter medium and 15 inches of mercury (7.84psi)
The standard step of vacuum
400 milliliters of times that filtrate is required collected in record
Table V
VDT water filtering performance with the cationic polymer scheme of the hardboard in paper mill, Midwest batching
Scheme Dosage lb/t 400 milliliters drainage time (second)
Blank (no polymer) - 45.44
Dispersion I 0.25 26.71
Polymer Q 0.06 30.18
Dispersion I/ polymer Q 0.25/0.06 22.12
Polymer Q 0.13 25.68
Dispersion I/ polymer Q 0.25/0.13 20.15
Polymer N 0.06 21.18
Dispersion I/ polymer N 0.25/0.06 19.25
Although relevant preferred or illustrative embodiment of the present invention is described in the above, these embodiments are also non exhaustive, also do not limit the present invention.Certainly, the present invention attempts to cover all selections, improvement and the equivalent in its spirit and scope that are defined by the following claims.

Claims (13)

1. one kind improve to keep in paper-making process and the method for water filtering performance, may further comprise the steps:
A) form moisture cellulose paper making pulp;
B) the hydrophily dispersed polymeres with effective dose joins in the slurry, and wherein the hydrophily dispersed polymeres has the cationic charge of 1-50 mole %, and its inherent viscosity, and is formed by following monomer polymerization to 10 deciliter/gram from 0.5 deciliter/gram:
I. cationic monomer diallyl-N, the disubstituted ammonium halide of N-, wherein the substituting group of said disubstituted ammonium halide is selected from C 1-C 20Alkyl, aryl, alkylaryl and aromatic alkyl;
Ii. second monomer of following molecular formula
R wherein 1And R 2Be selected from hydrogen, C 1-C 10Alkyl, aryl and alkylaryl; R 3Be selected from hydrogen and methyl; R 4And R 5Be selected from C 1-C 10Straight or branched alkylidene and hydrogen; Wherein said polymerisation is under the condition that has dispersant to exist, and carries out in the aqueous solution of multivalent anions salt;
C) the paper pulp filter is done to form paper; With
D) with paper dryer.
2. the described method of claim 1, wherein said cationic monomer is a diallyldimethylammonium chloride, described second monomer is an acrylamide.
3. the described method of claim 1, the inherent viscosity of wherein said hydrophily dispersed polymeres is 2.5 to 7.5 deciliter/gram.
4. the described method of claim 1, the inherent viscosity of wherein said hydrophily dispersed polymeres is 1.5 to 8.5 deciliter/gram.
5. the described method of claim 1, wherein said dispersed polymeres is with slurry solids 2.27 * 10 per ton -2Amount to 2.27 kilograms active matters adds.
6. the described method of claim 1 further is included in and adds coagulating agent in the step b).
7. the described method of claim 1 further is included in and adds flocculant in the step b).
8. the described method of claim 1 further is included in and adds alum in the step b).
9. the described method of claim 6 further is included in and adds alum in the step b).
10. the described method of claim 7 further is included in and adds alum in the step b).
11. the described method of claim 1 further is included in and adds cationic starch in the step b).
12. the described method of claim 7 further is included in and adds cationic starch in the step b).
13. the described method of claim 8 further is included in and adds cationic starch in the step b).
CNB998024716A 1999-01-15 1999-01-15 Papermaking process using hydrophilic dispersion polmers of diallyldi methyl ammonium chloride and acrylamide as retention and drainage aids Expired - Lifetime CN1189623C (en)

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US8491753B2 (en) * 2004-10-15 2013-07-23 Nalco Company Composition and method for improving retention and drainage in papermaking processes by activating microparticles with a promoter-flocculant system
CN100378163C (en) * 2005-03-19 2008-04-02 徐州市众恒精细化工技术有限公司 High copolymer pulp components for composite inorganic nanoparticles
CN101016359B (en) * 2007-03-06 2010-06-02 山东东方华龙工贸集团有限公司 Method of preparing cationic polyacrylamide aqueous emulsion
FI121545B (en) * 2007-10-18 2010-12-31 Chempolis Oy Method for improving the properties of pulp
WO2017147392A1 (en) 2016-02-26 2017-08-31 Ecolab Usa Inc. Drainage management in multi-ply papermaking
JP2020147888A (en) * 2019-03-06 2020-09-17 荒川化学工業株式会社 Dispersion for paper manufacturing agent, paper strengthening agent including the dispersion for paper manufacturing agent, freeness improver, and yield improver

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US4913775A (en) * 1986-01-29 1990-04-03 Allied Colloids Ltd. Production of paper and paper board
US5587415A (en) * 1991-07-30 1996-12-24 Hymo Corporation Process for preparation of dispersion of water-soluble cationic polymer the dispersion produced thereby and its use
CA2102742A1 (en) * 1992-11-10 1994-05-11 Kevin S. Dell Use of dadmac/acrylamide copolymer on newsprint machines
US5266164A (en) * 1992-11-13 1993-11-30 Nalco Chemical Company Papermaking process with improved drainage and retention
EP0760406A3 (en) * 1995-08-24 1997-09-17 Nalco Canada Inc Combination of poly (dadmac/acrylamide) and bentonite for deposition control in papermaking processes
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WO2000042253A1 (en) 2000-07-20
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BR9908576A (en) 2000-11-21
DE69924371D1 (en) 2005-04-28
EP1082493B1 (en) 2005-03-23
EP1082493A1 (en) 2001-03-14
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NO20003678L (en) 2000-09-12
DK1082493T3 (en) 2005-04-25

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