WO2015137521A1 - 紙の製造方法及びピッチ除去剤 - Google Patents
紙の製造方法及びピッチ除去剤 Download PDFInfo
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- WO2015137521A1 WO2015137521A1 PCT/JP2015/057967 JP2015057967W WO2015137521A1 WO 2015137521 A1 WO2015137521 A1 WO 2015137521A1 JP 2015057967 W JP2015057967 W JP 2015057967W WO 2015137521 A1 WO2015137521 A1 WO 2015137521A1
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- WIPO (PCT)
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- pitch
- polyvinyl alcohol
- mass
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- absorbance
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/08—Removal of fats, resins, pitch or waxes; Chemical or physical purification, i.e. refining, of crude cellulose by removing non-cellulosic contaminants, optionally combined with bleaching
- D21C9/086—Removal of fats, resins, pitch or waxes; Chemical or physical purification, i.e. refining, of crude cellulose by removing non-cellulosic contaminants, optionally combined with bleaching with organic compounds or compositions comprising organic compounds
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
- D21C5/02—Working-up waste paper
- D21C5/025—De-inking
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/32—Defibrating by other means of waste paper
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/32—Defibrating by other means of waste paper
- D21B1/325—Defibrating by other means of waste paper de-inking devices
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
- D21C5/02—Working-up waste paper
- D21C5/025—De-inking
- D21C5/027—Chemicals therefor
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/08—Removal of fats, resins, pitch or waxes; Chemical or physical purification, i.e. refining, of crude cellulose by removing non-cellulosic contaminants, optionally combined with bleaching
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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
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/14—Secondary fibres
-
- 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
- D21H17/36—Polyalkenyalcohols; Polyalkenylethers; Polyalkenylesters
-
- 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
- D21H21/02—Agents for preventing deposition on the paper mill equipment, e.g. pitch or slime control
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
Definitions
- the present invention relates to a method for producing paper using waste paper and a pitch remover used in this paper production method. More specifically, the present invention relates to a technique for removing pitch from pulp slurry.
- polyvinyl alcohol has both a hydrophobic group and a hydrophilic group, it is considered that the hydrophobic group is hydrophobically bonded to the pitch and the pitch is dispersed by the hydrophilic group to prevent adhesion to the wire. For this reason, in the conventional pitch control agent, the blocking property and the degree of saponification of the hydrophobic group of polyvinyl alcohol have been studied.
- the paper manufacturing method according to the present invention is a method of manufacturing paper using waste paper, and the average degree of polymerization is 300 to 2500 in the pulp slurry in the step of performing deinking by flotation and / or the preceding step.
- the saponification degree is 70 to 88 mol%
- the absorbance at a wavelength of 280 nm in an ultraviolet absorption spectrum of a 0.1% by mass aqueous solution is 0.1 Abs or more
- the iodine absorbance at a wavelength of 490 nm is y (Abs)
- polyvinyl alcohol satisfying the following formula (A) is added.
- the pitch remover according to the present invention is a pitch remover added to the pulp slurry in the step of performing deinking by flotation and / or the preceding step when producing paper using waste paper,
- the degree of polymerization is 300 to 2500
- the degree of saponification is 70 to 88 mol%
- the absorbance at a wavelength of 280 nm in an ultraviolet absorption spectrum of a 0.1% by mass aqueous solution is 0.1 Abs or more
- the degree of saponification is x (mol%), it contains polyvinyl alcohol satisfying the above formula (A).
- a conventional pitch control agent using polyvinyl alcohol has not been sufficiently effective when added to a papermaking system. Moreover, it is known that the blocking property of polyvinyl alcohol is affected by the degree of saponification, and it is not sufficient to specify the residual acetic acid group as in the pitch control agent described in Patent Document 2. Furthermore, in the papermaking process, the tendency to reuse and circulate water is increasing. Therefore, if the pitch is only dispersed in the papermaking system, the pitch is circulated and concentrated together with the circulation of water, which may worsen the pitch failure. is there.
- the main object of the embodiment of the present invention is to provide a paper manufacturing method and a pitch remover capable of efficiently removing pitch.
- the pitch can be efficiently removed.
- the present inventor has conducted intensive experiments, and as a result, in the flotation process for deinking waste paper raw materials, the pitch is moved out of the system by selectively transferring to the floss side together with bubbles. A method was found to reduce the amount of pitch that is discharged into the papermaking system. As a drug used at that time, it is desirable to use polyvinyl alcohol having a high blocking ability of residual acetic acid groups.
- the blocking property due to the residual acetic acid group can be expressed by a linear relationship using the iodine absorbance and saponification degree of polyvinyl alcohol.
- residual acetic acid group refers to an acetic acid group remaining without being substituted with a hydroxyl group in the saponification step when producing polyvinyl alcohol.
- the paper manufacturing method is a method of manufacturing paper using waste paper, and in the step of performing deinking by flotation and / or the previous step, the average polymerization is performed on the pulp slurry.
- the absorbance at a wavelength of 280 nm in an ultraviolet absorption spectrum of a 0.1% by weight aqueous solution is 0.1 Abs or more, and the iodine absorbance at a wavelength of 490 nm is 300 to 2500, the saponification degree is 70 to 88 mol%.
- y (Abs) and the degree of saponification are x (mol%)
- a pitch remover containing polyvinyl alcohol that satisfies the following formula (A) is added.
- the following mathematical formula (A) is obtained by plotting the saponification degree of polyvinyl alcohol evaluated in the Examples on the X axis and the iodine absorbance on the Y axis and calculating an approximate expression.
- polyvinyl alcohol contained in the pitch remover used in the paper manufacturing method of the present embodiment has a saponification degree of 70 to 88 mol%.
- saponification degree is less than 70 mol%, the hydrophobicity becomes too high, and the solubility in water decreases when used as a pitch remover.
- degree of saponification exceeds 88 mol%, the hydrophobicity becomes low, and when used as a pitch remover, it becomes difficult to selectively shift the pitch to the floss side.
- the saponification degree of polyvinyl alcohol is preferably 73 to 88 mol%, more preferably 82 to 86 mol%, from the viewpoint of water solubility and pitch removal performance.
- Polyvinyl alcohol contained in the pitch remover has an average degree of polymerization of 300 to 2500.
- the average degree of polymerization of polyvinyl alcohol is preferably 400 to 2000, more preferably 500 to 1500, from the viewpoints of floc size and floatability.
- the polyvinyl alcohol contained in the pitch remover has an absorbance at a wavelength of 280 nm in an ultraviolet absorption spectrum of a 0.1% by mass aqueous solution of 0.1 Abs or more.
- the absorbance at a wavelength of 280 nm is an index representing the amount of double bonds adjacent to the terminal carbonyl group contained in the structure of polyvinyl alcohol. When the value is less than 0.1 Abs, the cohesiveness of the pitch decreases. Tend to.
- the absorbance of polyvinyl alcohol at a wavelength of 280 nm is preferably 0.2 to 1.0 Abs, more preferably 0.3 to 0.5 Abs, from the viewpoint of improving pitch aggregation.
- the polyvinyl alcohol contained in the pitch remover preferably has a residual acetic acid group blocking property within a specific range, and in this embodiment, the relationship between the iodine absorbance y and the saponification degree x at a wavelength of 490 nm.
- fills the said Numerical formula (A) is used.
- Polyvinyl alcohol that has a value of intercept b less than 2.80 and does not satisfy the above formula (A) in the relationship between iodine absorbance y and saponification degree x at a wavelength of 490 nm does not exhibit sufficient blocking properties, and is a pitch remover. When used in a pitch, the cohesiveness of the pitch decreases.
- polyvinyl alcohol having a value of intercept b exceeding 3.03 and not satisfying the above formula (A) has poor dispersibility in water, and pitch When used as a remover, it does not sufficiently react with the pitch and the pitch removal performance is reduced.
- the aforementioned polyvinyl alcohol can be obtained, for example, by saponifying a vinyl ester polymer obtained by polymerizing a vinyl ester compound.
- vinyl ester compounds include vinyl formate, vinyl acetate, vinyl trifluoroacetate, vinyl propionate, vinyl butyrate, vinyl caprate, vinyl laurate, vinyl versatic acid, vinyl palmitate, vinyl stearate, pivalic acid. Etc. These vinyl ester compounds may be used alone or in combination of two or more.
- polyvinyl alcohol having an absorbance at a wavelength of 280 nm in an ultraviolet absorption spectrum of 0.1 Abs or more can be obtained by oxidizing polyvinyl alcohol produced by the above-described method with an oxidizing agent such as hydrogen peroxide.
- polymerization is performed in the presence of a chain transfer agent containing a carbonyl group such as aldehyde or ketone, followed by saponification, or polymerization is performed in the presence of 1-methoxyvinyl acetate, and this is saponified,
- it can be produced by a method in which air is blown into the system during polymerization to obtain polyvinyl acetate and then saponification is performed.
- Examples of the chain transfer agent used at that time include aldehydes such as acetaldehyde, propionaldehyde, n-butyraldehyde, benzaldehyde and crotonaldehyde, and ketones such as acetone, methyl ethyl ketone, hexanone and cyclohexanone.
- aldehydes such as acetaldehyde, propionaldehyde, n-butyraldehyde, benzaldehyde and crotonaldehyde
- ketones such as acetone, methyl ethyl ketone, hexanone and cyclohexanone.
- acetaldehyde, benzaldehyde, propionaldehyde, and n-butyraldehyde are particularly preferable because of easy control of chain transfer of vinyl acetate to a carbonyl compound.
- the chain transfer agent mentioned above may be used independently,
- the amount of the chain transfer agent described above can be appropriately selected according to the chain transfer constant, the degree of polymerization of the polyvinyl alcohol to be produced, and the like, but is usually added to a vinyl ester compound such as vinyl acetate as a raw material monomer.
- the content is preferably 0.05 to 5% by mass, more preferably 0.1 to 3% by mass.
- the chain transfer agent may be charged all at the beginning of the polymerization or may be charged during the polymerization.
- the molecular weight distribution of polyvinyl alcohol can be controlled by charging the chain transfer agent by an arbitrary method.
- polyvinyl alcohol whose iodine absorbance satisfies the above formula (A) can be produced, for example, by a method of controlling the dielectric constant of the saponification solvent in the production process of polyvinyl alcohol.
- the dielectric constant is 32c. g. s. e. s. u.
- the following solvents may be used.
- the dielectric constant is 32c. g. s. e. s. u.
- methanol 31.2 c.g.e.u.
- mixed solvent of methyl acetate / methanol 1/3 (mass ratio) (25.2 c.g.s.e. su)
- mixed solvent of methyl acetate / methanol 1/1 (mass ratio) (19.1 c.g.s.e.u.)
- methyl acetate / methanol 3/1 (mass ratio)
- Mixed solvent (13.1 c.g.e.s.u.), methyl acetate (7.03 c.g.e.s.u.), isopropyl acetate (6.3 c.g.s.).
- the dielectric constant of the saponification solvent can also be adjusted by adding water (86.4 c.g.s.e.u.).
- polyvinyl alcohol having various modifying groups may be used.
- polyvinyl alcohol having a functional group introduced by copolymerization as monomers used for copolymerization with vinyl ester monomers, olefins such as ethylene, propylene, isobutylene, ⁇ -octene, ⁇ -dodecene, ⁇ -octadecene, etc.
- Hydroxy group-containing ⁇ -olefins such as 3-buten-1-ol, 4-penten-1-ol, 5-hexen-1-ol, and 3,4-dihydroxy-1-butene, and acylated products thereof Derivatives; unsaturated acids such as acrylic acid, methacrylic acid, crotonic acid, maleic acid, maleic anhydride, itaconic acid and their salts; monoesters and dialkyl esters; nitriles such as acrylonitrile and methacrylonitrile; diacetone acrylamide, acrylamide, Amides such as methacrylamide; Ethylene Olefin sulfonic acids such as sulfonic acid, allyl sulfonic acid, methallyl sulfonic acid and their salts; diallyldimethylammonium chloride, diallyldimethylammonium bromide, diallyldiethylammonium chloride, diallyldiethylammonium bromid
- Polyvinyl alcohol having a functional group introduced by post-reaction includes those having an acetoacetyl group by reaction with diketene, those having a polyalkylene oxide group by reaction with ethylene oxide, hydroxy by reaction with an epoxy compound, etc. Examples thereof include those having an alkyl group and those obtained by acetalizing a aldehyde compound having various functional groups with polyvinyl alcohol.
- the pitch remover used in the paper manufacturing method of the present embodiment can contain components other than the aforementioned polyvinyl alcohol as long as the effects of the present embodiment are not impaired.
- Examples of other components contained in the pitch remover include 2,2-dibromo-2-nitroethanol, 2-bromo-2-nitropropane-1,3-diol, and dichloro-3-n-octyl-4- Examples include antiseptics such as isothiazoline-3-one, 2-n-octyl-4-isothiazolin-3-one, 1,3-diacetoxy-2-bromo-2-nitropropane, and oxalohydroxymoyl dichloride. These preservatives can be contained in an amount of about 0.001 to 0.1% by mass with respect to the total mass of the pitch remover.
- the pitch remover of this embodiment is usually used after being dissolved in a solvent.
- a solvent pure water, diethylene glycol, diethylene glycol monomethyl ether, polyoxyalkylene alkyl ether, or the like may be used, and these may be used alone or in combination.
- the aqueous solution concentration of the pitch remover is usually 1 to 30% by mass, preferably 5 to 20% by mass during storage and transportation.
- the content is usually 0.01 to 20% by mass, preferably 0.05 to 10% by mass. If the concentration is too thin, the pulp concentration of the raw material is affected. If the concentration is too high, the pitch remover tends to be difficult to disperse in the system.
- the above-mentioned pitch remover is desirably added in the step of deinking by flotation and / or the previous step from the viewpoint of preventing the pitch inflow to the paper making process.
- the average degree of polymerization is 300 to 2500
- the degree of saponification is 70 to 88 mol%
- polyvinyl alcohol is used in which the absorbance is 0.1 Abs or more and the relationship between the iodine absorbance y and the saponification degree x at a wavelength of 490 nm satisfies the above formula (A)
- the pitch can be selectively transferred to the floss together with the ink, and the pitch can be discharged out of the system.
- the pitch and ink contained in the waste paper raw material are difficult to float if they are too large, and difficult to float if they are too small.
- the size of the pitch and ink is preferably 4 ⁇ m or more and several hundred ⁇ m or less.
- the pitch remover used in the paper manufacturing method of the present embodiment selectively agglomerates a fine pitch less than 4 ⁇ m that is difficult to float to 4 ⁇ m or more and several hundred ⁇ m or less to react with bubbles. The size can be easily adjusted.
- Polyvinyl alcohol having a high blocking ability of residual acetic acid groups has an effect of adsorbing and aggregating pitch.
- polyvinyl alcohol having a higher blocking ability of residual acetic acid groups is used as the pitch remover, so that fine agglomerates are formed by adsorbing the pitch and float with the bubbles. It can be made easier.
- the pitch can be selectively transferred to the floss by the flowator, so that the amount of pitch contained in the finished raw material can be reduced and the pitch failure in the paper making process can be reduced.
- the present embodiment can employ the following configuration.
- (1) A method for producing paper using waste paper, in the step of deinking by flotation and / or in the previous step, the pulp slurry has an average degree of polymerization of 300 to 2500 and a degree of saponification of 70 to 88.
- the absorbance at a wavelength of 280 nm in an ultraviolet absorption spectrum of a 0.1% by mass aqueous solution is 0.1 Abs or more, the iodine absorbance at a wavelength of 490 nm is y (Abs), and the saponification degree is x (mol%).
- the saponification degree is 70 to 88 mol%
- the absorbance at a wavelength of 280 nm in an ultraviolet absorption spectrum of a 0.1% by mass aqueous solution is 0.1 Abs or more
- the iodine absorbance at a wavelength of 490 nm is y (Abs)
- methyl acetate and methanol are added to the solution obtained by removing the unreacted vinyl acetate monomer from the polymerized solution, and 54 parts by mass of polyvinyl acetate, 11.5 parts by mass of methyl acetate, and 34.4 parts by mass of methanol.
- Part and a solution containing 0.14 parts by mass of water were prepared.
- this solution was subjected to a saponification reaction using sodium hydroxide as a catalyst, using a kneader, and the resulting polyvinyl alcohol slurry was solid-liquid separated and then dried in a dryer to obtain polyvinyl alcohol A.
- methyl acetate and methanol are added to the solution obtained by removing the unreacted vinyl acetate monomer from the polymerized solution, 50.0 parts by mass of polyvinyl acetate, 21.4 parts by mass of methyl acetate, and 28.
- a solution containing 4 parts by mass and 0.15 parts by mass of water (solution dielectric constant: 21.0 c.g.se.u.) was prepared.
- this solution was subjected to a saponification reaction using sodium hydroxide as a catalyst and a kneader.
- the obtained polyvinyl alcohol slurry was subjected to solid-liquid separation, and then dried with a drier to obtain polyvinyl alcohol C.
- methyl acetate and methanol are added to the solution obtained by removing the unreacted vinyl acetate monomer from the polymerized solution, and 29.9 parts by mass of polyvinyl acetate, 53.8 parts by mass of methyl acetate and 16.
- a solution (solution dielectric constant: 12.8 c.g.s.e.u.) containing 2 parts by mass and 0.20 parts by mass of water was prepared. Then, this solution was subjected to a saponification reaction using sodium hydroxide as a catalyst and a kneader. The obtained polyvinyl alcohol slurry was subjected to solid-liquid separation, and then dried with a drier to obtain polyvinyl alcohol K.
- ⁇ Absorbance measurement at 280 nm> For polyvinyl alcohols A to O, the absorbance at 280 nm of the ultraviolet absorption spectrum was measured. Specifically, 0.2% by mass of polyvinyl alcohol with respect to normal temperature water was well dispersed while stirring, and the temperature was raised to 75 ° C. Then, it melt
- polyvinyl alcohols A to K in which the average degree of polymerization, the degree of saponification, and the relationship between the degree of saponification x and the iodine absorbance y are all within the scope of the present invention have a high blocking ability of residual acetic acid groups. It was a thing.
- the average degree of polymerization and the degree of saponification are within the range of the present invention, but the polyvinyl alcohol L to O in which the relationship between the saponification degree x and the iodine absorbance y is out of the range of the present invention has a residual acetate group blocking property of polyvinyl alcohol. It was lower than alcohols A to K.
- FIG. 1 is a graph showing the relationship between the saponification degree and the iodine absorbance at 490 nm.
- Acrylic pressure-sensitive adhesive Restex A-6001 (manufactured by Residex Co., Ltd.) was dissolved in pure water as a simulated pitch to a concentration of 10 mg / L to prepare a solution.
- Polyvinyl alcohols A to O shown in Table 1 were dissolved in water as a pitch remover to obtain an aqueous solution.
- the concentration of the aqueous solution was 10 mg / L, and after adding to the solution obtained above, Fluorol 555 (manufactured by Excion) was further added to the solution after addition of polyvinyl alcohol to dye the simulated pitch. 0.5% by mass was added to prepare preparation solutions of Examples 1 to 11 and Comparative Examples 2 to 5.
- the amount of SS in the floss was measured according to JIS K0102.
- the pitch concentration in the froth is determined by a high-speed solvent extractor (ASE350, manufactured by Nippon Dionex Co., Ltd.) using a solvent in which chloroform (special grade made by Kishida Chemical) and benzene (special grade reagent made by Kishida Chemical) are mixed 1: 1. Extracted and measured. The above results are summarized in Table 2 below.
- the SS concentration in the floss was suppressed to a value equal to or lower than that in the comparative example 40, and the pitch concentration in the floss was higher than that in the comparative examples 41 to 44. The value could be increased.
- the pitch remover containing polyvinyl alcohol according to the present invention can selectively shift pitch to floss without increasing the foam of the floatator.
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Abstract
Description
以下、本実施形態の紙の製造方法で用いられるピッチ除去剤に含有されるポリビニルアルコールについて説明する。ピッチ除去剤に含有されるポリビニルアルコールは、鹸化度が70~88モル%である。鹸化度が70モル%未満になると、疎水性が高くなりすぎて、ピッチ除去剤としたときに水への溶解性が低下する。一方、鹸化度が88モル%を超えると、疎水性が低くなり、ピッチ除去剤に用いたときに、ピッチをフロス側に選択的に移行させることが難しくなる。
本実施形態の紙の製造方法で用いられるピッチ除去剤は、本実施形態の効果を阻害しない範囲で、前述したポリビニルアルコール以外の成分を含有することができる。ピッチ除去剤に含有されるその他の成分としては、例えば2,2−ジブロモ−2−ニトロエタノールや2−ブロモ−2−ニトロプロパン−1,3−ジオール、ジクロロ−3−n−オクチル−4−イソチアゾリン−3−オン、2−n−オクチル−4−イソチアゾリン−3−オン、1,3−ジアセトキシ−2−ブロモ−2−ニトロプロパン、オキサロヒドロキシモイル=ジクロリド等の防腐剤が挙げられる。これらの防腐剤は、ピッチ除去剤の全質量に対して0.001~0.1質量%程度含有することができる。
溶媒として、純水やジエチレングリコール、ジエチレングリコールモノメチルエーテル、ポリオキシアルキレンアルキルエーテル等を用いてもよく、これらは1種類で使用しても、数種類を併用してもよい。
ピッチ除去剤の水溶液濃度は保存・輸送時では、通常1~30質量%、好ましくは5~20質量%である。パルプスラリー添加時には、通常0.01~20質量%、好ましくは0.05~10質量%である。かかる濃度が薄すぎると原料のパルプ濃度へ影響を与え、濃すぎると系内へピッチ除去剤が分散しにくい傾向がある。
(1)古紙を用いて紙を製造する方法であって、フローテーションにより脱墨を行う工程及び/又はその前工程において、パルプスラリーに、平均重合度が300~2500、鹸化度が70~88モル%であり、0.1質量%水溶液の紫外線吸収スペクトルにおける波長280nmでの吸光度が0.1Abs以上であり、かつ、波長490nmでのヨード吸光度をy(Abs)、鹸化度をx(モル%)としたとき、下記数式(A)を満たすポリビニルアルコールを添加する紙の製造方法。
第1実施例では、以下に示す方法で製造したポリビニルアルコールA~Oについて、ピッチ除去性能を評価した。
酢酸ビニル100質量部、アセトアルデヒド1.2質量部、メタノール4.7質量部及び酢酸ビニルに対して、0.0071質量%の2,2’−アゾビスイソブチロニトリルを重合缶に仕込み、缶内を窒素置換した後、加熱して、沸点下で重合反応を開始して約7時間反応を行い、重合率が80.5質量%に達した時点で反応を停止した。
前述したポリビニルアルコールAの製造工程の鹸化反応において、触媒量と鹸化時間を調整し、ポリビニルアルコールB、D~Jを得た。
酢酸ビニル100質量部、アセトアルデヒド1.2質量部、メタノール4.7質量部及び酢酸ビニルに対して、0.0071質量%の2,2’−アゾビスイソブチロニトリルを重合缶に仕込み、缶内を窒素置換した後、加熱して、沸点下で重合反応を開始して約7時間反応を行い、重合率が80.5質量%に達した時点で反応を停止した。
酢酸ビニル100質量部、アセトアルデヒド1.2質量部、メタノール4.7質量部及び酢酸ビニルに対して、0.0071質量%の2,2’−アゾビスイソブチロニトリルを重合缶に仕込み、缶内を窒素置換した後、加熱して、沸点下で重合反応を開始して約7時間反応を行い、重合率が80.5質量%に達した時点で反応を停止した。
酢酸ビニルをメタノール中で重合し、ポリ酢酸ビニルのメタノール溶液を得た。得られたポリ酢酸ビニルのメタノール溶液を、水酸化ナトリウムを触媒として鹸化し、ポリビニルアルコールのスラリーを得た。得られたポリビニルアルコールのスラリーを固液分離した後、乾燥機にて乾燥してポリビニルアルコールL~Oを得た。
ポリビニルアルコールA~Oについて、紫外線吸収スペクトルの280nmでの吸光度の測定を行った。具体的には、常温水に対して0.2質量%のポリビニルアルコールを撹拌しながらよく分散させ、75℃まで昇温した。その後、3時間撹拌しながら溶解し、常温まで撹拌しながら冷却した。得られた溶液の樹脂分を測定した後、0.1質量%ポリビニルアルコール水溶液を調整した。調整後の試料溶液をセルに入れて吸光度を測定した。
ポリビニルアルコールA~Oについて、ヨード吸光度にて、その残酢酸基配置を確認した。具体的には、0.1質量%ポリビニルアルコール水溶液5mlに、純水を11ml加えて全容量を16mlとし、これを恒温水槽で25℃に保持した。これに、N/1000ヨード溶液を4ml添加し、攪拌した後、再び恒温水槽に20分間浸漬した。その後、発色した試料溶液を、25℃に調節したセルに入れて、波長490nmにおけるヨード吸光度を測定した。
純水に、模擬ピッチとしてアクリル系粘着剤レヂテックスA−6001(株式会社レヂテックス製)を、濃度が10mg/Lになるよう溶解し、溶解液を調製した。上記表1に示すポリビニルアルコールA~Oをピッチ除去剤として水に溶解し、水溶液とした。かかる水溶液の濃度は10mg/Lであり、上記で得られた溶解液に添加した後、更に、模擬ピッチを染色するためにフルオロール555(Excion社製)を、ポリビニルアルコール添加後の溶解液に対して0.5質量%添加し、実施例1~11及び比較例2~5の調製液を作製した。
次に、本発明の第2実施例として、フローテーション試験を行った。本実施例では、新聞紙とチラシを、質量比で、7:3の割合で混合した古紙原料を、水道水により、カナディアンスタンダードフリーネスが200mL、浮遊物質(SS)濃度が1質量%になるように離解して調製した試験用スラリーを用いた。
前述した第1実施例及び第2実施例の結果に基づいて、ポリビニルアルコールA~Oのピッチ除去効果を評価した。評価は、ピッチがフローテーターで除去可能な大きさ(4μm以上)のフロックを形成し、かつフローテーション試験も良好であったものを○、ピッチが細かく分散するか又はフローテーション試験が不良であったものを×とした。その結果を下記表3に示す。なお、下記表3には、比較例として、ポリビニルアルコールを添加しなかった場合の結果も併せて示す。
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