JP6509121B2 - 歩留り剤およびそれを用いた紙の製造方法 - Google Patents
歩留り剤およびそれを用いた紙の製造方法 Download PDFInfo
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- JP6509121B2 JP6509121B2 JP2015541628A JP2015541628A JP6509121B2 JP 6509121 B2 JP6509121 B2 JP 6509121B2 JP 2015541628 A JP2015541628 A JP 2015541628A JP 2015541628 A JP2015541628 A JP 2015541628A JP 6509121 B2 JP6509121 B2 JP 6509121B2
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- XYLMUPLGERFSHI-UHFFFAOYSA-N alpha-Methylstyrene Chemical compound CC(=C)C1=CC=CC=C1 XYLMUPLGERFSHI-UHFFFAOYSA-N 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 229910001870 ammonium persulfate Inorganic materials 0.000 description 1
- 239000012736 aqueous medium Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229960005070 ascorbic acid Drugs 0.000 description 1
- AYJRCSIUFZENHW-DEQYMQKBSA-L barium(2+);oxomethanediolate Chemical compound [Ba+2].[O-][14C]([O-])=O AYJRCSIUFZENHW-DEQYMQKBSA-L 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- RVNBHBGRVZNYOO-UHFFFAOYSA-M benzyl-diethyl-(2-prop-2-enoyloxyethyl)azanium;chloride Chemical compound [Cl-].C=CC(=O)OCC[N+](CC)(CC)CC1=CC=CC=C1 RVNBHBGRVZNYOO-UHFFFAOYSA-M 0.000 description 1
- ZGCZDEVLEULNLJ-UHFFFAOYSA-M benzyl-dimethyl-(2-prop-2-enoyloxyethyl)azanium;chloride Chemical compound [Cl-].C=CC(=O)OCC[N+](C)(C)CC1=CC=CC=C1 ZGCZDEVLEULNLJ-UHFFFAOYSA-M 0.000 description 1
- QBZPCMKUFMJWAN-UHFFFAOYSA-N benzyl-dimethyl-[3-(prop-2-enoylamino)propyl]azanium;chloride Chemical compound [Cl-].C=CC(=O)NCCC[N+](C)(C)CC1=CC=CC=C1 QBZPCMKUFMJWAN-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000004067 bulking agent Substances 0.000 description 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 159000000007 calcium salts Chemical class 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- SPTHWAJJMLCAQF-UHFFFAOYSA-M ctk4f8481 Chemical compound [O-]O.CC(C)C1=CC=CC=C1C(C)C SPTHWAJJMLCAQF-UHFFFAOYSA-M 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000002761 deinking Substances 0.000 description 1
- 150000001991 dicarboxylic acids Chemical class 0.000 description 1
- DOMZHHGNMGSFQG-UHFFFAOYSA-M diethyl-[2-hydroxy-3-(2-methylprop-2-enoyloxy)propyl]-methylazanium;chloride Chemical compound [Cl-].CC[N+](C)(CC)CC(O)COC(=O)C(C)=C DOMZHHGNMGSFQG-UHFFFAOYSA-M 0.000 description 1
- IOMDIVZAGXCCAC-UHFFFAOYSA-M diethyl-bis(prop-2-enyl)azanium;chloride Chemical compound [Cl-].C=CC[N+](CC)(CC)CC=C IOMDIVZAGXCCAC-UHFFFAOYSA-M 0.000 description 1
- OQZUAJHVSVTARK-UHFFFAOYSA-M ethyl-dimethyl-(3-prop-2-enoyloxypropyl)azanium;chloride Chemical compound [Cl-].CC[N+](C)(C)CCCOC(=O)C=C OQZUAJHVSVTARK-UHFFFAOYSA-M 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- IMBKASBLAKCLEM-UHFFFAOYSA-L ferrous ammonium sulfate (anhydrous) Chemical compound [NH4+].[NH4+].[Fe+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O IMBKASBLAKCLEM-UHFFFAOYSA-L 0.000 description 1
- 239000011790 ferrous sulphate Substances 0.000 description 1
- 235000003891 ferrous sulphate Nutrition 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000001530 fumaric acid Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 229940015043 glyoxal Drugs 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 125000004051 hexyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- QGWKRYREOQNOCC-UHFFFAOYSA-N hydrogen peroxide;1-methyl-4-propan-2-ylbenzene Chemical compound OO.CC(C)C1=CC=C(C)C=C1 QGWKRYREOQNOCC-UHFFFAOYSA-N 0.000 description 1
- 150000002432 hydroperoxides Chemical class 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- ATEAWHILRRXHPW-UHFFFAOYSA-J iron(2+);phosphonato phosphate Chemical compound [Fe+2].[Fe+2].[O-]P([O-])(=O)OP([O-])([O-])=O ATEAWHILRRXHPW-UHFFFAOYSA-J 0.000 description 1
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 1
- 125000000959 isobutyl group Chemical group [H]C([H])([H])C([H])(C([H])([H])[H])C([H])([H])* 0.000 description 1
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002609 medium Substances 0.000 description 1
- FQPSGWSUVKBHSU-UHFFFAOYSA-N methacrylamide Chemical compound CC(=C)C(N)=O FQPSGWSUVKBHSU-UHFFFAOYSA-N 0.000 description 1
- 125000005395 methacrylic acid group Chemical group 0.000 description 1
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 150000002763 monocarboxylic acids Chemical class 0.000 description 1
- 229940088644 n,n-dimethylacrylamide Drugs 0.000 description 1
- YLGYACDQVQQZSW-UHFFFAOYSA-N n,n-dimethylprop-2-enamide Chemical compound CN(C)C(=O)C=C YLGYACDQVQQZSW-UHFFFAOYSA-N 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 125000002347 octyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000012766 organic filler Substances 0.000 description 1
- 125000006353 oxyethylene group Chemical group 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- IAWXHEPLJXAMSG-UHFFFAOYSA-N pent-2-en-1-amine Chemical compound CCC=CCN IAWXHEPLJXAMSG-UHFFFAOYSA-N 0.000 description 1
- 125000001147 pentyl group Chemical group C(CCCC)* 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 229920000083 poly(allylamine) Polymers 0.000 description 1
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000002685 polymerization catalyst Substances 0.000 description 1
- 229920000193 polymethacrylate Polymers 0.000 description 1
- 229920005990 polystyrene resin Polymers 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 238000007717 redox polymerization reaction Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- XWGJFPHUCFXLBL-UHFFFAOYSA-M rongalite Chemical compound [Na+].OCS([O-])=O XWGJFPHUCFXLBL-UHFFFAOYSA-M 0.000 description 1
- 238000005185 salting out Methods 0.000 description 1
- 239000012488 sample solution Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 229940047670 sodium acrylate Drugs 0.000 description 1
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 1
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulphite Substances [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
- 239000011122 softwood Substances 0.000 description 1
- 238000001694 spray drying Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000001384 succinic acid Substances 0.000 description 1
- BUUPQKDIAURBJP-UHFFFAOYSA-N sulfinic acid Chemical compound OS=O BUUPQKDIAURBJP-UHFFFAOYSA-N 0.000 description 1
- RAHZWNYVWXNFOC-UHFFFAOYSA-N sulfur dioxide Inorganic materials O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 239000001117 sulphuric acid Substances 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- XLRLRFILSCUPFG-UHFFFAOYSA-M triethyl(2-prop-2-enoyloxyethyl)azanium;bromide Chemical compound [Br-].CC[N+](CC)(CC)CCOC(=O)C=C XLRLRFILSCUPFG-UHFFFAOYSA-M 0.000 description 1
- NCDYOSPPJZENCU-UHFFFAOYSA-M triethyl(2-prop-2-enoyloxyethyl)azanium;chloride Chemical compound [Cl-].CC[N+](CC)(CC)CCOC(=O)C=C NCDYOSPPJZENCU-UHFFFAOYSA-M 0.000 description 1
- IACHBBYPUKLZPO-UHFFFAOYSA-N triethyl-[3-(prop-2-enoylamino)propyl]azanium;chloride Chemical compound [Cl-].CC[N+](CC)(CC)CCCNC(=O)C=C IACHBBYPUKLZPO-UHFFFAOYSA-N 0.000 description 1
- RVFMNOVIYBHKDY-UHFFFAOYSA-L trimethyl(2-prop-2-enoyloxyethyl)azanium;sulfate Chemical compound [O-]S([O-])(=O)=O.C[N+](C)(C)CCOC(=O)C=C.C[N+](C)(C)CCOC(=O)C=C RVFMNOVIYBHKDY-UHFFFAOYSA-L 0.000 description 1
- OEIXGLMQZVLOQX-UHFFFAOYSA-N trimethyl-[3-(prop-2-enoylamino)propyl]azanium;chloride Chemical compound [Cl-].C[N+](C)(C)CCCNC(=O)C=C OEIXGLMQZVLOQX-UHFFFAOYSA-N 0.000 description 1
- 239000007762 w/o emulsion Substances 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- UGZADUVQMDAIAO-UHFFFAOYSA-L zinc hydroxide Chemical compound [OH-].[OH-].[Zn+2] UGZADUVQMDAIAO-UHFFFAOYSA-L 0.000 description 1
- 229940007718 zinc hydroxide Drugs 0.000 description 1
- 229910021511 zinc hydroxide Inorganic materials 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Classifications
-
- 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
-
- 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
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Paper (AREA)
Description
まず、本発明の歩留り剤について説明する。本発明に用いられる歩留り剤とは、粘度平均分子量が3500万を超えるカチオン性またはアニオン性の高分子化合物であり、カチオン性またはアニオン性の高分子化合物のカチオンまたはアニオン電荷密度は0.6〜4.0meq/gである。
(式中、R1は水素原子または炭素数1〜5のアルキル基、X1は塩素原子、臭素原子、硫酸残基、硝酸残基、有機カルボン酸残基または有機スルホン酸残基、nは重合度を示す)で表されるものである。
下記表1〜9に示すカチオン性およびアニオン性の高分子化合物を用いて歩留り剤を調製した。なお、各実施例、参考例および比較例ならびに従来例で用いられたカチオン性およびアニオン性の高分子化合物は以下の通りである。
カチオン性高分子化合物A: アクリルアミド−アクリロイルオキシエチルトリメチルアンモニウムクロリド共重合体(直鎖構造)
カチオン性高分子化合物B: アクリルアミド−アクリロイルオキシエチルトリメチルアンモニウムクロリド共重合体(分岐構造)
アニオン性高分子化合物A: アクリルアミド−アクリル酸ナトリウム共重合体(直鎖構造)
アニオン性高分子化合物B: アクリルアミド−アクリル酸ナトリウム共重合体(分岐構造)
高分子化合物の粘度平均分子量は、極限粘度法に従って、ウベローデ粘度計(柴田科学株式会社製、商品名「粘度計 ウベローデ」)を用いて極限粘度を測定し、ポリビニルアルコール換算して求めた。
各カチオン性高分子化合物の電荷密度は、コロイド滴定法に従って、ポリビニル硫酸カリウム(和光純薬株式会社製、商品名「ポリビニル硫酸カリウム滴定液(N/400)」を用いて測定した。また、各アニオン性高分子化合物の電荷密度は、コロイド滴定法に従って、メチルグリコールキトサン溶液(和光純薬株式会社製、商品名「メチルグリコールキトサン溶液(N/200)」)を添加後、過剰分をポリビニル硫酸カリウム(和光純薬株式会社製、商品名「ポリビニル硫酸カリウム滴定液(N/400)」を用いて測定した。
得られた歩留り剤を用いて、下記の手順に従って、歩留り剤添加試験を行い、歩留り性(全歩留りと灰分歩留り)、濾水性、濁度、カチオン要求量およびピッチ量の6項目について評価した。さらに、スクリーン添加後、抄紙して得られた紙について地合い物性評価を行った。これらの項目については、以下の方法により評価した。また、従来例として、カチオン性歩留り剤とアニオン性歩留り助剤とを用いて、実施例や比較例と同様に歩留り剤添加試験を行った。
パルプ3.2質量%濃度のパルプ含有水性スラリーを白水で希釈し、スラリー濃度1.0質量%のパルプ含有水性スラリーを調製した。白水とは紙の製造工程にて循環使用される水のことをいう。このパルプ含有水性スラリーをブリット式ダイナミックドレイネージジャーテスター(40メッシュのスクリーンとタービン翼を備えた撹拌機を装備。以下、「ブリットジャー」と略す。)に入れた後、撹拌機を用いて毎分1200回転にて撹拌しながら、10秒間隔で硫酸バンドを0.5質量%、アルキルケテンダイマー系サイズ剤(AKD)を0.2質量%、カチオン性ポリアクリルアミド系紙力剤を0.5質量%、下記表1〜9に示す濃度で填料として炭酸カルシウムをこの順序で添加し、25秒経過後、回転数を600回転に変更して、さらに15秒撹拌した。歩留り剤の添加位置は、填料を添加後10秒後および/または25秒後とした。填料を添加後10秒後に歩留り剤を添加した場合をスクリーン(SC)前添加試験とし、得られた結果を表1〜3に示す。また、填料を添加後25秒後に歩留り剤を添加した場合をスクリーン後添加試験とし、得られた結果を表4〜6に示す。さらに、填料を添加後10秒後と25秒後に歩留り剤を添加した場合をスクリーン前後添加試験とし、得られた結果を表7〜9に示す。なお、各薬剤および歩留り剤を加えた後のパルプ含有水性スラリー(以下、「試料スラリー」という。)のpHは7.5となるように調整した。
歩留り剤添加試験で得られた試料溶液100mlをワットマンNo.4濾紙を用いて濾過し、得られた濾液を110℃で60分間乾燥し、乾燥後の質量を測定することにより、全歩留り(%)を求めた。また、乾燥後の濾紙を550℃で2時間加熱したときの灰分より、灰分歩留り(%)を測定した。
歩留り剤添加試験で得られた試料スラリーを坪量が50g/m2となるように抄紙機(東西精機社製、商品名「角型抄紙機」)を用いて抄紙した。得られた湿紙はプレス機を用いて荷重5.25kg/cm2にて5分間加圧し、さらに2分間加圧した後、脱水した。続いて、回転式ドライヤーを用いて95℃にて3分間乾燥後、25℃、湿度55%にて24時間放置し、評価用の紙を得た。この紙を光透過型光学式地合計(エムケイシステムズ(MK SYSTEMS)社製、商品名「3Dシートアナライザー」)を用いて地合い指数を測定した。得られた指数値は大きい値の方が地合い物性が良好であることを示す。
歩留り剤添加試験で得られた試料スラリー500mlを100メッシュを張った内径50mmのアクリル樹脂製円筒型の容器に入れ、メスシリンダーを用いて濾水量200mlとなるまでの時間を測定した。
歩留り剤添加試験で得られた試料スラリーを撹拌機で撹拌したまま下穴から50mlを採取し、ワットマンNo.4濾紙にて吸引濾過し、その濾液についてJIS K0101によりホルマジン濁度を測定した。この濁度は、歩留り、薬剤、ピッチの定着性を評価するためのものであり、この値が小さいほど歩留りが高く、薬剤、ピッチの定着率が高いものであることを意味する。
歩留り剤添加試験で得られた試料スラリーを、濁度測定と同じく、撹拌機で撹拌したまま下穴から50mlを採取し、ワットマンNo.4濾紙にて吸引濾過した。得られた濾液についてカチオン要求量を粒子電荷計(ミューテック社製、商品名「Particle Charge Detector PCD03」)により測定した。このカチオン要求量は、系内の電荷状態を評価するためのものであり、この値が高ければ、系内にアニオン性物質が多く含まれることを意味する。
歩留り剤添加試験で得られた試料スラリー250mlと予め質量を測定したポリエチレン製発泡プラスチック片(12cm×3cm×1cm)とをガラスビンに入れ、40℃恒温で2時間振とう後、前記プラスチック片を取り出し、100mlのイオン交換水で洗浄後、乾燥し、発泡プラスチック片の質量を測定し、次の計算式により付着量(mg)を求め、付着量をピッチ量とした。
付着量=(振とう後のプラスチック片の質量)−(初期プラスチック片の質量)
このピッチ量は、系内の疎水性ピッチ成分の量を示すものであり、この値が高ければピッチ成分がパルプ繊維に定着できていないことを意味する。
歩留り剤の添加位置がスクリーン前である場合について検討すると、参考例1−1および実施例1−14、1−15および1−16は、比較1−15と比較して全歩留り、濾水性、濁度が向上し、ピッチ量も削減できていることが理解できる。実施例1−16では、全歩留りが極めて高い水準であるため実用レベルであるものの、地合い物性がやや劣る結果となった。また、実施例1−2と比較例1−2を比較すると、実施例1−2の方が地合い物性を損なうことなく全ての物性を向上させていることが理解できる。参考例1−5と比較例1−7を比較すると地合い物性も向上していることが理解できる。
歩留り剤の添加位置がスクリーン前である場合について検討する。参考例1−1、1−17および1−18は、比較例1−3および1−16と比較すると、電荷密度が所定の範囲(0.6〜4.0meq/gの範囲)である場合に、全歩留り率、濾水性、濁度が向上すると共に更にピッチ量も削減できていることが理解できる。
実施例1−10、1−12、2−9、2−12および3−5ならびに比較例1−11、1−12および2−9と同一の条件で、抄紙機(塗工原紙マシン、抄紙速度:1300m/分)に対して、実機による歩留り剤添加試験を行った。実機では、種箱前で硫酸バンドを、種箱でアルキルケテンダイマー系サイズ剤(AKD)を、種箱後でカチオン性ポリアクリルアミド系紙力剤を、ファンポンプ前で填料として炭酸カルシウムを、スクリーン前、スクリーン後またはスクリーン前後で歩留り剤をそれぞれ添加した。得られた結果を表10に示す。
2 ファンポンプ
3 スクリーン
4 インレット
Claims (5)
- 粘度平均分子量が5000万〜8300万(但し、5000万を除く)であるカチオン性またはアニオン性の高分子化合物を含有し、
前記カチオン性またはアニオン性の高分子化合物のカチオンまたはアニオン電荷密度が0.6〜4.0meq/gであることを特徴とする歩留り剤。 - パルプ含有水性スラリーを、スクリーンを通過させた後、抄紙する工程を有する紙の製造方法において、
前記スクリーン通過前およびスクリーン通過後の少なくとも一方に、前記高分子化合物の濃度がパルプ成分に対して500ppm未満となるように、請求項1記載の歩留り剤を前記パルプ含有水性スラリーに添加することを特徴とする紙の製造方法。 - 前記パルプ含有水性スラリーにさらに填料をパルプに対し5〜60質量%添加する請求項2記載の紙の製造方法。
- 前記歩留り剤をスクリーン通過後のパルプ含有水性スラリーに添加する請求項2または3記載の紙の製造方法。
- 前記歩留り剤をスクリーン通過前のパルプ含有水性スラリーとスクリーン通過後のパルプ含有水性スラリーに添加する請求項2または3記載の紙の製造方法。
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