JP2810669B2 - Method for preventing discoloration of paper and paper with discoloration prevented - Google Patents
Method for preventing discoloration of paper and paper with discoloration preventedInfo
- Publication number
- JP2810669B2 JP2810669B2 JP63170081A JP17008188A JP2810669B2 JP 2810669 B2 JP2810669 B2 JP 2810669B2 JP 63170081 A JP63170081 A JP 63170081A JP 17008188 A JP17008188 A JP 17008188A JP 2810669 B2 JP2810669 B2 JP 2810669B2
- Authority
- JP
- Japan
- Prior art keywords
- paper
- discoloration
- pulp
- hypophosphorous acid
- prevented
- 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.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title claims description 23
- 238000002845 discoloration Methods 0.000 title claims description 19
- ACVYVLVWPXVTIT-UHFFFAOYSA-N phosphinic acid Chemical compound O[PH2]=O ACVYVLVWPXVTIT-UHFFFAOYSA-N 0.000 claims description 20
- -1 alkali metal salt Chemical class 0.000 claims description 11
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 claims description 8
- ACVYVLVWPXVTIT-UHFFFAOYSA-M phosphinate Chemical compound [O-][PH2]=O ACVYVLVWPXVTIT-UHFFFAOYSA-M 0.000 claims description 6
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 5
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 claims description 4
- 229910052783 alkali metal Inorganic materials 0.000 claims description 4
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 claims description 4
- 229960004198 guanidine Drugs 0.000 claims description 4
- 229960000789 guanidine hydrochloride Drugs 0.000 claims description 4
- PJJJBBJSCAKJQF-UHFFFAOYSA-N guanidinium chloride Chemical compound [Cl-].NC(N)=[NH2+] PJJJBBJSCAKJQF-UHFFFAOYSA-N 0.000 claims description 4
- 150000003839 salts Chemical class 0.000 description 15
- 229920001131 Pulp (paper) Polymers 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000004040 coloring Methods 0.000 description 5
- KWSLGOVYXMQPPX-UHFFFAOYSA-N 5-[3-(trifluoromethyl)phenyl]-2h-tetrazole Chemical compound FC(F)(F)C1=CC=CC(C2=NNN=N2)=C1 KWSLGOVYXMQPPX-UHFFFAOYSA-N 0.000 description 4
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910001379 sodium hypophosphite Inorganic materials 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 4
- 238000004061 bleaching Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000003973 paint Substances 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- 229920002401 polyacrylamide Polymers 0.000 description 3
- 238000004513 sizing Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 2
- PJUIMOJAAPLTRJ-UHFFFAOYSA-N monothioglycerol Chemical compound OCC(O)CS PJUIMOJAAPLTRJ-UHFFFAOYSA-N 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229940035024 thioglycerol Drugs 0.000 description 2
- CWERGRDVMFNCDR-UHFFFAOYSA-N thioglycolic acid Chemical compound OC(=O)CS CWERGRDVMFNCDR-UHFFFAOYSA-N 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- WBHAUHHMPXBZCQ-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound COC1=CC=CC(C)=C1O WBHAUHHMPXBZCQ-UHFFFAOYSA-N 0.000 description 1
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 244000025254 Cannabis sativa Species 0.000 description 1
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 description 1
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 239000004155 Chlorine dioxide Substances 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229920000877 Melamine resin Polymers 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 229920002873 Polyethylenimine Polymers 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 229920001807 Urea-formaldehyde Polymers 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 238000003490 calendering Methods 0.000 description 1
- 235000009120 camo Nutrition 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 235000005607 chanvre indien Nutrition 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 235000019398 chlorine dioxide Nutrition 0.000 description 1
- 238000004649 discoloration prevention Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- GRWZHXKQBITJKP-UHFFFAOYSA-L dithionite(2-) Chemical compound [O-]S(=O)S([O-])=O GRWZHXKQBITJKP-UHFFFAOYSA-L 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003623 enhancer Substances 0.000 description 1
- 238000007730 finishing process Methods 0.000 description 1
- 239000011487 hemp Substances 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000010893 paper waste Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 238000004076 pulp bleaching Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Paper (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、紙の変色防止方法及び変色の防止された紙
に関する。Description: TECHNICAL FIELD The present invention relates to a method for preventing discoloration of paper and a paper in which discoloration is prevented.
詳しくは、製紙工程及び製紙後のいずれか任意の段階
において、紙に次亜リン酸またはその塩を含有させるか
または塗布することを特徴とする、特に光の照射による
紙の変色を防止する方法、及び次亜リン酸またはその塩
を含有させるかまたは塗布することによって変色の防止
された紙に関する。More specifically, a method for preventing discoloration of paper due to light irradiation, particularly comprising adding or applying hypophosphorous acid or a salt thereof to paper at any arbitrary stage after papermaking and after papermaking. And paper which is prevented from discoloring by containing or applying hypophosphorous acid or a salt thereof.
木材、その他の植物原料を機械的または化学的に処理
して、機械パルプ、ケミカルパルプ、セミケミカルパル
プ、故紙パルプ、麻パルプ、リンターパルプ等のパルプ
を製造し、これを抄紙して紙を製造することは周知であ
る。Wood and other plant materials are mechanically or chemically treated to produce mechanical pulp, chemical pulp, semi-chemical pulp, waste paper pulp, hemp pulp, linter pulp, and other pulp, which is then made into paper. It is well known to do so.
また、未晒しパルプをそのまま抄紙した場合には白色
度が劣るため、必要に応じて、塩素、次亜塩素酸塩、二
酸化塩素、過酸化水素、酸素などを用いた酸化漂白ある
いはハイドロサルファイト、亜硫酸水などを用いた還元
漂白により、パルプを漂白することも行われる。In addition, if unbleached pulp is directly made paper, the whiteness is inferior, so if necessary, chlorine, hypochlorite, chlorine dioxide, hydrogen peroxide, oxidized bleaching using oxygen or the like, or hydrosulfite, Pulp bleaching is also carried out by reduction bleaching using a sulfite solution or the like.
製紙工程においては、パルプを単独であるいは適宜混
合して叩解し、サイズ剤、填料等の薬剤を添加する調成
工程、各種の抄紙機により抄紙、脱水、乾燥、つや出し
する抄造工程、及び紙の用途に応じて塗料を紙の表面に
塗布する加工及び仕上げ工程によって、所望の物性を有
する紙が製造される。In the papermaking process, the pulp is beaten singly or appropriately mixed, and a preparation process in which sizing agents, fillers and other chemicals are added, papermaking, dewatering, drying, and polishing of various papermaking machines, and papermaking processes. Paper having desired physical properties is produced by a processing and a finishing step in which a paint is applied to the surface of the paper according to the application.
しかしながら、かくして得られた紙は、製造直後にお
いては所定の白色度を有しているものの、太陽光等の紫
外線を含む光に曝された場合に著しい着色変化を生じる
欠点があり、このような光による着色変化は、パルプの
種類あるいは漂白の有無によらず起こるものである。However, although the paper thus obtained has a predetermined whiteness immediately after production, it has a drawback of causing a significant coloring change when exposed to light including ultraviolet rays such as sunlight. The color change caused by light occurs regardless of the type of pulp or the presence or absence of bleaching.
特に、近年、木材資源の有効利用、廃棄物の低減等を
目的として、パルプの収率の高い、所謂高収率パルプの
使用が増加しつつあるが、このような高収率パルプはリ
グニンの含有率が高いために光による着色変化が大き
く、高収率パルプ単独使用の場合のみならず、これと化
学パルプを混合して用いる場合にも大きな問題となって
いた。Particularly, in recent years, the use of so-called high-yield pulp with a high pulp yield for the purpose of effective use of wood resources and reduction of waste has been increasing. Since the content is high, the coloring change by light is large, which has been a serious problem not only in the case of using a high yield pulp alone, but also in the case of using it with a chemical pulp in a mixture.
この光による着色変化を抑制することも検討されてお
り、例えば、紫外線吸収剤を紙内に含有させる方法が検
討されているが、この方法は、極めて高価な紫外線吸収
剤を多量に添加する必要があるばかりでなく、紫外線吸
収剤は通常黄色に着色しているため、紫外線吸収剤を添
加した紙に好ましくない着色を与える欠点もあった。It has been studied to suppress the color change caused by the light. For example, a method of containing an ultraviolet absorber in paper has been studied, but this method requires the addition of a large amount of an extremely expensive ultraviolet absorber. In addition to the above, the ultraviolet absorber is usually colored yellow, so that there is a drawback that the paper to which the ultraviolet absorber is added has an undesirable coloring.
また、タッピジャーナル（Tappi Journal）1987年11
月号117〜122頁には、高収率パルプの光照射による着色
を防ぐために、チオグリセロール、チオグリコール酸等
の低分子量のメルカプト化合物が有効であることが報告
されている。しかしながら、この方法による場合にはそ
の効果が不十分であるばかりでなく、用いられるメルカ
プト化合物による臭気の問題もあり、実用的な方法とい
えるものではなかった。In addition, Tappi Journal (1987)
Monthly pages 117 to 122 report that low-molecular-weight mercapto compounds such as thioglycerol and thioglycolic acid are effective for preventing high-yield pulp from being colored by light irradiation. However, when this method is used, the effect is not sufficient, and there is a problem of odor due to the mercapto compound used, so that it cannot be said to be a practical method.
このため、他の物性に悪影響を及ぼさずに、紙の光に
よる着色を防止する方法を見出すことが強く望まれてい
た。Therefore, it has been strongly desired to find a method for preventing coloring of paper by light without adversely affecting other physical properties.
尚、ソ連特許第485178号、同542775号、同697617号及
び同857328号には、パルプの製造時に、次亜リン酸塩を
用いることにより高収率でパルプを製造できることが記
載されているが、パルプの製造時に用いた次亜リン酸塩
は製紙後は紙中には実質上残存しないことは明らかであ
り、また製紙後の紙の変色を防止する効果についても全
く記載されていない。Incidentally, US Pat.Nos. 485178, 542775, 697617 and 857328 describe that pulp can be produced in high yield by using hypophosphite during the production of pulp. It is clear that the hypophosphite used in the production of pulp does not substantially remain in the paper after the papermaking, and there is no description on the effect of preventing discoloration of the paper after the papermaking.
本発明者等は、上記の現状に鑑み、紙の光による着色
を防止する方法について鋭意検討を重ねた結果、紙に次
亜リン酸またはその塩を含有させるかまたは塗布するこ
とによって、光の照射による紙の変色を効果的に防止で
きることを知見した。In view of the above situation, the present inventors have conducted intensive studies on a method of preventing coloring of paper with light, and as a result, containing or applying hypophosphorous acid or a salt thereof to paper has resulted in light emission. It has been found that discoloration of paper due to irradiation can be effectively prevented.
本発明は、上記知見に基づきなされたもので、製紙工
程及び製紙後のいずれか任意の段階において、紙に、次
亜リン酸グアニジン及び塩酸グアニジンを実質的に含ま
ない次亜リン酸またはそのアルカリ金属塩もしくはアル
カリ土類金属塩を含有させるかまたは塗布することを特
徴とする紙の変色防止方法、及び次亜リン酸グアニジン
及び塩酸グアニジンを実質的に含まない次亜リン酸また
はそのアルカリ金属塩もしくはアルカリ土類金属塩を含
有させるかまたは塗布することによって変色の防止され
た紙を提供するものである。The present invention has been made based on the above findings, and in any arbitrary stage after the papermaking process and after the papermaking, the paper contains guanidine hypophosphite and guanidine hydrochloride substantially free of hypophosphorous acid or an alkali thereof. A method for preventing discoloration of paper, characterized by containing or applying a metal salt or an alkaline earth metal salt, and guanidine hypophosphite and hypophosphorous acid substantially free of guanidine hydrochloride or an alkali metal salt thereof Another object of the present invention is to provide a paper in which discoloration is prevented by containing or applying an alkaline earth metal salt.
以下、本発明の紙の変色防止方法及び変色の防止され
た紙について詳述する。Hereinafter, the method for preventing discoloration of paper and the paper in which discoloration is prevented according to the present invention will be described in detail.
本発明で用いられる次亜リン酸は次の一般式で表され
る。The hypophosphorous acid used in the present invention is represented by the following general formula.
また、本発明で用いられる次亜リン酸のアルカリ金属
塩としては、リチウム、ナトリウム、カリウム等との塩
があげられ、アルカリ土類金属塩としては、マグネシウ
ム、カルシウム、バリウム、ストロンチウム等との塩が
あげられる。 Examples of the alkali metal salts of hypophosphorous acid used in the present invention include salts with lithium, sodium, and potassium. Examples of the alkaline earth metal salts include salts with magnesium, calcium, barium, strontium, and the like. Is raised.
次亜リン酸またはその塩の使用量（含有量または塗布
量）は、特に制限を受けず、必要とする変色防止効果の
程度あるいは紙の種類によって適宜決定し得るが、一般
には、紙に対して0.1〜20重量％（乾燥重量基準）、よ
り好ましくは１〜10重量％となるように用いられる。The amount of hypophosphorous acid or a salt thereof used (content or application amount) is not particularly limited and may be appropriately determined depending on the required degree of discoloration prevention effect or the type of paper. 0.1 to 20% by weight (based on dry weight), more preferably 1 to 10% by weight.
紙に次亜リン酸またはその塩を含有させるかまたは塗
布する方法としては、パルプを叩解し、サイズ剤、填料
等の薬剤を添加する調成工程において次亜リン酸または
その塩を添加する方法；抄紙した紙を搾水、乾燥、カレ
ンダリングする抄造工程または抄紙した紙の表面に塗料
等を塗布する加工及び仕上げ工程のいずれかにおいて次
亜リン酸またはその塩の溶液を抄紙した紙に塗布または
含浸させる方法；及び製紙後に次亜リン酸またはその塩
の溶液を紙にスプレーまたは塗布する方法等があげら
れ、その添加方法及び添加時期に制限を受けるものでは
ない。As a method of adding or applying hypophosphorous acid or a salt thereof to paper, a method of beating pulp and adding hypophosphorous acid or a salt thereof in a preparation step of adding a drug such as a sizing agent or a filler is used. Applying a solution of hypophosphorous acid or a salt thereof to the paper in either the papermaking process of squeezing, drying, and calendering the paper made, or in the process of applying paint or the like to the surface of the paper made, and in the finishing process. And a method of spraying or applying a solution of hypophosphorous acid or a salt thereof to paper after papermaking, and there is no limitation on the method and timing of addition.
また、次亜リン酸またはその塩の多くは、水溶性であ
るかまたは水に容易に分散することができるので、これ
らを添加、塗布する際に水溶液として用いることがで
き、特別の操作を必要としない利点を有する。In addition, since many hypophosphorous acids or salts thereof are water-soluble or can be easily dispersed in water, they can be used as an aqueous solution when they are added and applied, requiring special operations. And does not have the advantage.
また、本発明の対象となる紙は特に制限を受けず、本
発明は、各種のパルプから製造される紙の全てに対して
有効であり、特に、機械パルプ、セミケミカルパルプ等
のリグニンを含有するパルプから製造された紙に対する
効果が顕著である。Further, the paper targeted by the present invention is not particularly limited, and the present invention is effective for all papers manufactured from various pulp, and particularly contains mechanical pulp and lignin such as semi-chemical pulp. The effect on the paper produced from the pulp is significant.
また、紙の製造に用いるパルプは漂白されたものであ
ってもあるいは未漂白のものであっても良い。Further, the pulp used in the production of paper may be bleached or unbleached.
さらに、本発明で変色の防止される紙は、製紙工業に
おいて通常用いられる各種の紙薬品を含有することがで
き、また、塗料等を塗布した加工紙であってもよい。Further, the paper whose discoloration is prevented in the present invention can contain various paper chemicals usually used in the papermaking industry, and may be processed paper coated with paint or the like.
これらの紙薬品としては、ロジン系、石油樹脂系、合
成樹脂系、ワックス系のサイズ剤；澱粉、ポリビニルア
ルコール、ポリアクリルアミド等の表面紙質向上剤；ポ
リアクリルアミド、カルボキシメチルセルロース、尿素
樹脂、メラミン樹脂、エポキシ化ポリアミドポリアミン
樹脂等の紙力増強剤；ポリエチレンイミン系、ポリアク
リルアミド系等の歩留り向上剤等があげられる。These paper chemicals include rosin-based, petroleum resin-based, synthetic resin-based, and wax-based sizing agents; surface paper quality improvers such as starch, polyvinyl alcohol, and polyacrylamide; polyacrylamide, carboxymethyl cellulose, urea resins, melamine resins, Paper strength enhancers such as epoxidized polyamide polyamine resins; and yield improvers such as polyethyleneimine and polyacrylamide.
本発明で用いられる次亜リン酸またはその塩は、これ
らの紙薬品の添加の有無にかかわらず紙の変色を防止す
る効果を発揮する。The hypophosphorous acid or a salt thereof used in the present invention has an effect of preventing discoloration of paper regardless of the presence or absence of these paper chemicals.
以下、実施例によって本発明の更に詳細に説明する
が、本発明は下記の実施例によって制限を受けるもので
はない。Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited by the following examples.
実施例−１ 秤量46g/m2の新聞紙に、乾燥塗布量2.5g/m2となるよ
うに10％次亜リン酸またはその塩の水溶液を塗布・乾燥
した。Example 1 A 10% aqueous solution of hypophosphorous acid or a salt thereof was applied to newspaper paper weighing 46 g / m 2 so as to have a dry application amount of 2.5 g / m 2 and dried.
この新聞紙を太陽光に一週間暴露し、変色の度合いを
ハンター比色計で測定した暴露前後の黄色度（ASTM D1
925）の変化で表した。The newspaper was exposed to sunlight for one week, and the degree of discoloration was measured with a Hunter colorimeter before and after exposure (ASTM D1
925).
また、比較のため、次亜リン酸類無添加のもの及び次
亜リン酸類の代わりにチオグリセロールを添加したもの
についても同様に試験した。For comparison, the same test was carried out for the case where no hypophosphorous acid was added and the case where thioglycerol was added instead of hypophosphorous acid.
その結果を下記表−１に示す。 The results are shown in Table 1 below.
実施例−２ 秤量46g/m2の新聞紙に、所定量の10％次亜リン酸ナト
リウム水溶液を塗布・乾燥した。 Example 2 A predetermined amount of a 10% aqueous sodium hypophosphite solution was applied to newspaper paper weighing 46 g / m 2 and dried.
この新聞紙を83℃のフェードメータに入れ３時間照射
した後の黄色度の変化を測定した。This newsprint was placed in a 83 ° C. fade meter and irradiated for 3 hours, and the change in yellowness was measured.
その結果を下記表−２に示す。 The results are shown in Table 2 below.
実施例−３ 過酸化水素により漂白した、白色度77.0のケミサーモ
メカニカルパルプを10％の次亜リン酸ナトリウムを溶解
した蒸留水に１％の濃度で分散させた。この分散液か
ら、手漉きによりシートを作成し、次いで含水率50％ま
で脱水後、風乾して、次亜リン酸ナトリウム含率５％の
手漉きシートを作成した。 Example 3 Chemithermomechanical pulp bleached with hydrogen peroxide having a whiteness of 77.0 was dispersed at a concentration of 1% in distilled water in which 10% of sodium hypophosphite was dissolved. From the dispersion, a sheet was prepared by handmaking, then dehydrated to a water content of 50%, and air-dried to prepare a handmade sheet having a sodium hypophosphite content of 5%.
このシートを83℃のフェードメーター中で照射し、そ
の黄色度の変化を測定した。The sheet was irradiated in a fade meter at 83 ° C., and the change in yellowness was measured.
また、比較のため次亜リン酸ナトリウムを加えないで
作成したシートについても同様に試験した。For comparison, a sheet prepared without adding sodium hypophosphite was similarly tested.
その結果を下記表−３に示す。 The results are shown in Table 3 below.
実施例−１〜実施例−３の結果から、紙に次亜リン酸
またはその塩を含有させるかまたは塗布することによ
り、紙の光照射による変色が著しく防止されることが明
らかである。 From the results of Example-1 to Example-3, it is clear that discoloration due to light irradiation of the paper is significantly prevented by adding or applying hypophosphorous acid or a salt thereof to the paper.
本発明の方法によれば、他の物性に悪影響を及ぼさず
に、光の照射による紙の変色を効果的に防止できる。According to the method of the present invention, discoloration of paper due to light irradiation can be effectively prevented without adversely affecting other physical properties.
また、本発明の紙は、光の照射による変色が著しく防
止されたものである。Further, the paper of the present invention is one in which discoloration due to light irradiation is significantly prevented.
Claims (2)
において、紙に、次亜リン酸グアニジン及び塩酸グアニ
ジンを実質的に含まない次亜リン酸またはそのアルカリ
金属塩もしくはアルカリ土類金属塩を含有させるかまた
は塗布することを特徴とする紙の変色防止方法。1. In a papermaking process and at any stage after papermaking, paper contains guanidine hypophosphite and hypophosphorous acid substantially free of guanidine hydrochloride, or an alkali metal salt or an alkaline earth metal salt thereof. A method for preventing discoloration of paper, characterized by containing or applying.
を実質的に含まない次亜リン酸またはそのアルカリ金属
塩もしくはアルカリ土類金属塩を含有させるかまたは塗
布することによって変色の防止された紙。2. A paper whose discoloration is prevented by containing or applying hypophosphorous acid or an alkali metal salt or an alkaline earth metal salt thereof substantially free of guanidine hypophosphite and guanidine hydrochloride.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63170081A JP2810669B2 (en) | 1988-07-08 | 1988-07-08 | Method for preventing discoloration of paper and paper with discoloration prevented |
| US07/715,042 US5181988A (en) | 1988-07-08 | 1991-06-12 | Method for preventing the discoloration of paper and paper treated to prevent discoloring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63170081A JP2810669B2 (en) | 1988-07-08 | 1988-07-08 | Method for preventing discoloration of paper and paper with discoloration prevented |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0219594A JPH0219594A (en) | 1990-01-23 |
| JP2810669B2 true JP2810669B2 (en) | 1998-10-15 |
Family
ID=15898289
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63170081A Expired - Lifetime JP2810669B2 (en) | 1988-07-08 | 1988-07-08 | Method for preventing discoloration of paper and paper with discoloration prevented |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2810669B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013185294A (en) * | 2013-06-19 | 2013-09-19 | Hokuetsu Kishu Paper Co Ltd | Multilayered paper containing recycled pulp and method for producing the same |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5296218A (en) * | 1976-02-02 | 1977-08-12 | Sanwa Chemical Co Ltd | Flame proofing agent for fiber material |
-
1988
- 1988-07-08 JP JP63170081A patent/JP2810669B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0219594A (en) | 1990-01-23 |
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