JP2020020082A - Fabric bleaching method and method for reducing color reversion of bleached fabric - Google Patents
Fabric bleaching method and method for reducing color reversion of bleached fabric Download PDFInfo
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- 239000004744 fabric Substances 0.000 title claims abstract description 118
- 238000004061 bleaching Methods 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 title claims abstract description 67
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 57
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims abstract description 49
- 239000000835 fiber Substances 0.000 claims abstract description 22
- 235000013311 vegetables Nutrition 0.000 claims abstract description 20
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 12
- 229920000742 Cotton Polymers 0.000 claims description 39
- XWGJFPHUCFXLBL-UHFFFAOYSA-M rongalite Chemical group [Na+].OCS([O-])=O XWGJFPHUCFXLBL-UHFFFAOYSA-M 0.000 claims description 12
- 238000005868 electrolysis reaction Methods 0.000 claims description 7
- 229910003460 diamond Inorganic materials 0.000 claims description 4
- 239000010432 diamond Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 230000001678 irradiating effect Effects 0.000 abstract description 2
- 230000002087 whitening effect Effects 0.000 abstract 1
- 238000009991 scouring Methods 0.000 description 26
- 230000000694 effects Effects 0.000 description 22
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 6
- 238000007796 conventional method Methods 0.000 description 5
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- 239000005708 Sodium hypochlorite Substances 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 235000011121 sodium hydroxide Nutrition 0.000 description 3
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000002270 dispersing agent Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000010409 ironing Methods 0.000 description 2
- 239000008399 tap water Substances 0.000 description 2
- 235000020679 tap water Nutrition 0.000 description 2
- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-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
- 241000196324 Embryophyta Species 0.000 description 1
- 241000219146 Gossypium Species 0.000 description 1
- 240000000907 Musa textilis Species 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000007844 bleaching agent Substances 0.000 description 1
- 235000009120 camo Nutrition 0.000 description 1
- 235000005607 chanvre indien Nutrition 0.000 description 1
- 239000013522 chelant Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000006103 coloring component Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 239000011487 hemp Substances 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 229930014626 natural product Natural products 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- 239000012279 sodium borohydride Substances 0.000 description 1
- 229910000033 sodium borohydride Inorganic materials 0.000 description 1
- UKLNMMHNWFDKNT-UHFFFAOYSA-M sodium chlorite Chemical compound [Na+].[O-]Cl=O UKLNMMHNWFDKNT-UHFFFAOYSA-M 0.000 description 1
- 229960002218 sodium chlorite Drugs 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
Abstract
Description
本発明は、植物性繊維を含む布の漂白方法、及び漂白された布の製造方法、並びに漂白後の布の色戻り低減方法に関する。 The present invention relates to a method for bleaching a cloth containing vegetable fibers, a method for producing a bleached cloth, and a method for reducing the color return of a cloth after bleaching.
従来より、綿布の製造工程では、天然物由来の着色成分を漂白するために、亜塩素酸ナトリウム及び次亜塩素酸ナトリウム水溶液や熱処理等が用いられている。しかしながら、次亜塩素酸ナトリウム等の薬品は環境に対する負荷が大きく、また、熱処理はエネルギー効率が悪い。 BACKGROUND ART Conventionally, in a cotton fabric manufacturing process, an aqueous solution of sodium chlorite and sodium hypochlorite, a heat treatment, and the like have been used in order to bleach a coloring component derived from a natural product. However, chemicals such as sodium hypochlorite have a large burden on the environment, and heat treatment has low energy efficiency.
一方、綿布の漂白方法として、酸化剤又は還元剤と光照射を併用する方法（特許文献１〜３）や、オゾン水により綿布を処理する方法（特許文献４）が知られている。しかしながら、これらの方法も環境に対する負荷、エネルギー効率又は漂白効果の点で必ずしも満足できない。 On the other hand, as a method of bleaching a cotton cloth, a method of using an oxidizing agent or a reducing agent and light irradiation in combination (Patent Documents 1 to 3) and a method of treating a cotton cloth with ozone water (Patent Document 4) are known. However, these methods are not always satisfactory in terms of environmental load, energy efficiency or bleaching effect.
また、漂白後の布にアイロンがけ等を行って加熱すると、漂白の効果が薄れて色戻りが起きることが知られているが、有効な防止方法は知られていない。 Also, it is known that when the bleached cloth is heated by ironing or the like, the bleaching effect is weakened and the color is returned, but no effective prevention method is known.
本発明の目的は、環境に対する負荷が小さく、必要なエネルギーが少なく、漂白効果の優れた、植物性繊維を含む布の新規な漂白方法を提供することである。また、本発明の目的は、植物性繊維を含む布の、漂白後の色戻りを低減する方法を提供することである。 An object of the present invention is to provide a novel method for bleaching a fabric containing vegetable fibers, which has a low environmental load, requires less energy, and has an excellent bleaching effect. Another object of the present invention is to provide a method for reducing the color return of a fabric containing vegetable fibers after bleaching.
本願発明者らは、鋭意研究の結果、漂白対象となる布をオゾン水で処理すると同時に布に紫外線を照射することにより、小さなエネルギーで優れた漂白効果が得られることを見出し、本願第１の発明を完成した。また、漂白後の布を還元剤で処理することにより、漂白後の布を加熱処理することにより起きる色戻りを低減することが可能であることを見出し、本願第２の発明を完成した。 As a result of intensive studies, the inventors of the present invention have found that an excellent bleaching effect can be obtained with small energy by treating a cloth to be bleached with ozone water and simultaneously irradiating the cloth with ultraviolet rays. Completed the invention. Further, they have found that by treating the bleached cloth with a reducing agent, it is possible to reduce the color reversion caused by heat-treating the bleached cloth, and completed the second invention of the present application.
すなわち、本発明は以下のものを提供する。
(1) 植物性繊維を含む布の漂白方法であって、前記布をオゾン水で処理しながら前記布に紫外線を照射する、布の漂白方法。
(2) 前記布が綿布又は麻布である(1)記載の方法。
(3) 前記布が精練されていない布である(1)又は(2)記載の方法。
(4) 前記オゾン水による処理が、前記布に前記オゾン水を連続的にかけ流すことにより行われる、(1)〜(3)のいずれか１項に記載の方法。
(5) 前記オゾン水による処理が、水の電気分解によりオゾン水を生成させるオゾン水生成装置から排出されるオゾン水を前記布に直接かけ流すことにより行われる、(4)記載の方法。
(6) 水の電気分解に用いられる電極が、ホウ素ドープダイヤモンド電極である、(5)記載の方法。
(7) 漂白されていない、植物性繊維を含む布を準備する工程と、該布を、(1)〜(6)のいずれか１項に記載の漂白方法により漂白する工程を含む、漂白された布の製造方法。
(8) 植物性繊維を含む布の漂白後の色戻りを低減する方法であって、漂白後の前記布を還元剤で処理することを含む、漂白後の布の色戻りを低減する方法。
(9) 前記還元剤が、ヒドロキシメタンスルフィン酸ナトリウムである(8)記載の方法。
(10) 前記布が、(1)〜(6)のいずれか１項に記載の漂白方法により漂白されたものである、(8)又は(9)記載の方法。
That is, the present invention provides the following.
(1) A method for bleaching a cloth containing vegetable fibers, wherein the cloth is irradiated with ultraviolet rays while treating the cloth with ozone water.
(2) The method according to (1), wherein the cloth is cotton cloth or linen cloth.
(3) The method according to (1) or (2), wherein the cloth is unrefined cloth.
(4) The method according to any one of (1) to (3), wherein the treatment with the ozone water is performed by continuously flowing the ozone water over the cloth.
(5) The method according to (4), wherein the treatment with ozone water is performed by directly flowing ozone water discharged from an ozone water generator that generates ozone water by electrolysis of water onto the cloth.
(6) The method according to (5), wherein the electrode used for electrolysis of water is a boron-doped diamond electrode.
(7) a step of preparing a cloth containing vegetable fibers that has not been bleached, and a step of bleaching the cloth by the bleaching method according to any one of (1) to (6), Fabric manufacturing method.
(8) A method for reducing the color return of a cloth containing vegetable fibers after bleaching, comprising treating the bleached cloth with a reducing agent.
(9) The method according to (8), wherein the reducing agent is sodium hydroxymethanesulfinate.
(10) The method according to (8) or (9), wherein the cloth has been bleached by the bleaching method according to any one of (1) to (6).
本発明の方法は、下記実施例に具体的に記載されるように、漂白効果が優れており、精練工程を経ていない布に対しても優れた漂白効果を発揮し、必要なエネルギーは小さい。また、使用するオゾン水に含まれるオゾンは、何らの処理を行わなくても、時間の経過と共に自然に酸素に転換されていくので、環境に対する負荷も小さい。また、本発明の、色戻り低減方法により、漂白後の布をアイロンがけする等の加熱処理による色戻りを低減することができる。 The method of the present invention has an excellent bleaching effect, exhibits an excellent bleaching effect even on a cloth that has not been subjected to a scouring step, and requires a small amount of energy, as specifically described in the following Examples. In addition, ozone contained in ozone water used is naturally converted to oxygen with the passage of time without any treatment, so that the burden on the environment is small. Further, the color return reduction method of the present invention can reduce the color return due to heat treatment such as ironing the bleached cloth.
本発明の漂白方法に供される布は、植物性繊維を含む布である。植物性繊維としては、綿、麻、マニラ麻を挙げることができるがこれらに限定されるものではなく、植物性であればよい。また、植物性繊維を含む布は、植物繊維を含んでいればよいが、好ましくは、重量基準で、布を構成する繊維の３０％以上、さらに好ましくは４０％以上、さらに好ましくは５０％以上、さらに好ましくは８０％以上、さらに好ましくは９５％以上、最も好ましくは１００％が植物繊維である布を意味する。特に好ましい布は綿布及び麻布である。布は、織布であっても不織布であってもよいが、接着剤を用いない織布が好ましい。 The cloth used for the bleaching method of the present invention is a cloth containing vegetable fibers. Examples of the vegetable fiber include cotton, hemp, and manila hemp, but are not limited thereto, and may be any vegetable fiber. Further, the cloth containing vegetable fibers may contain vegetable fibers, but is preferably 30% or more, more preferably 40% or more, and still more preferably 50% or more of the fibers constituting the cloth on a weight basis. , More preferably at least 80%, more preferably at least 95%, most preferably at least 100% vegetable fibers. Particularly preferred fabrics are cotton and linen. The cloth may be a woven cloth or a non-woven cloth, but a woven cloth not using an adhesive is preferable.
本発明の方法に用いるオゾン水中のオゾン濃度は、満足できる漂白効果が発揮される濃度であれば特に限定されないが、通常0.1ppm〜10ppm程度、好ましくは0.3ppm〜4ppm程度、さらに好ましくは0.5ppm〜2ppm程度、さらに好ましくは0.8ppm〜1.2ppm程度である。 The ozone concentration in the ozone water used in the method of the present invention is not particularly limited as long as a satisfactory bleaching effect is exhibited, but is usually about 0.1 ppm to 10 ppm, preferably about 0.3 ppm to 4 ppm, more preferably 0.5 ppm. About 2 ppm, more preferably about 0.8 ppm to 1.2 ppm.
オゾン水は、水の電気分解により効率よく製造することができる。特に、電気分解の電極として、ホウ素ドープダイヤモンド（ＢＤＤ）電極を用いることにより、高効率でオゾンが生成されるので、ＢＤＤ電極を用いてオゾン水を製造することが好ましい。ＢＤＤ電極を用いたオゾン水の生成装置は種々のものが市販されているので、市販のオゾン水生成装置を用いることができる。 Ozone water can be efficiently produced by electrolysis of water. In particular, since ozone is generated with high efficiency by using a boron-doped diamond (BDD) electrode as an electrode for electrolysis, it is preferable to produce ozone water using a BDD electrode. Since various types of ozone water generators using BDD electrodes are commercially available, commercially available ozone water generators can be used.
オゾン水による処理は、漂白効果を高めるために、布にオゾン水を連続的にかけ流すことにより行うことが好ましい。特に、常時生成直後のオゾンを布と接触させるために、水の電気分解によりオゾン水を生成させるオゾン水生成装置から排出されるオゾン水を連続的に布に直接かけ流すことにより行うことが好ましい。布にオゾン水を連続的にかけ流す場合、オゾン水の流量は、満足できる漂白効果が発揮される流量であれば特に限定されないが、通常、布面積1cm2当り5mL/分〜500mL/分程度、好ましくは20mL/分〜300mL/分程度、さらに好ましくは30mL/分〜120mL程度、さらに好ましくは45mL/分〜75mL/分程度である。オゾン水の温度は、特に限定されないが、常温でよい。 The treatment with ozone water is preferably performed by continuously flowing ozone water over the cloth in order to enhance the bleaching effect. In particular, in order to always contact the ozone immediately after generation with the cloth, it is preferable that the ozone water discharged from an ozone water generation device that generates ozone water by electrolysis of water be continuously applied directly to the cloth. . When passing over the ozone water continuously to the fabric, the flow rate of the ozone water is not particularly limited as long as the flow rate of bleaching effect satisfactory is exerted generally cloth area 1 cm 2 per 5 mL / min ～500ML / min approximately, It is preferably about 20 mL / min to 300 mL / min, more preferably about 30 mL / min to about 120 mL, and more preferably about 45 mL / min to about 75 mL / min. The temperature of the ozone water is not particularly limited, but may be room temperature.
上記したオゾン水処理と同時並行して、布に紫外線を照射する。照射する紫外線の強度は、満足できる漂白効果が発揮される強度であれば特に限定されないが、波長310nm〜380nmの光の合計として、布1cm2当り通常、20mW〜1500mW程度、好ましくは40mW〜700mW程度、さらに好ましくは80mW〜350mW程度、さらに好ましくは130mW〜200mW程度である。 At the same time as the above-mentioned ozone water treatment, the cloth is irradiated with ultraviolet rays. The intensity of the irradiated ultraviolet ray is not particularly limited as long as the intensity of bleaching effect satisfactory is exhibited, as the sum of the light of wavelength 310Nm～380nm, cloth 1 cm 2 per usually about 20MW～1500mW, preferably 40mW~700mW About 80 mW-350 mW, more preferably about 130 mW-200 mW.
漂白時間は、満足できる漂白効果が発揮される時間であれば特に限定されず、オゾン水のオゾン濃度、オゾン水流量、紫外線強度等に応じて適宜選択できるが、通常、３０分から４時間、好ましくは４５分〜３時間程度である。 The bleaching time is not particularly limited as long as a satisfactory bleaching effect is exhibited, and can be appropriately selected depending on the ozone concentration of the ozone water, the flow rate of the ozone water, the ultraviolet intensity, and the like. Usually, the bleaching time is preferably from 30 minutes to 4 hours. Is about 45 minutes to 3 hours.
本発明の漂白方法は、優れた漂白効果を発揮し、精練前の布に対しても満足できる漂白効果を発揮する。すなわち、綿布や麻布の漂白に先立ち、通常、布に含まれる、植物由来の夾雑物を除去するために、界面活性剤等の薬剤を使用した精練工程が行われる。下記実施例にも記載するように、精練工程は、例えば、精練剤０．５〜２．０ｇ/Ｌ、苛性ソーダ１．０〜２．０ｇ/Ｌ、キレート分散剤０．５〜１．０ｇ/Ｌを使用し、浴比１：１０〜１５、９０〜９５℃×４５〜９０分で処理すること等により行われる。下記実施例において具体的に記載するように、本発明の漂白方法を実施した場合、精練前の布であっても、精練後の布とほぼ同程度の漂白効果を得ることができる。しかも、精練前の布は、ろう（ワックス）分等の夾雑物の故に撥水性を示すが、精練前の布に本発明の漂白方法を施した場合には、布が親水性になる。よって、本発明の漂白方法を採用することにより、精練工程を省略することが可能であり、精練工程に使用する薬剤が不要になるので、コスト面でも環境負荷の面でも非常に有利である。 The bleaching method of the present invention exhibits an excellent bleaching effect and a satisfactory bleaching effect even on a cloth before scouring. That is, prior to bleaching of cotton cloth or linen cloth, usually, a scouring step using a chemical such as a surfactant is performed to remove plant-derived impurities contained in the cloth. As described in the following examples, the scouring step is performed, for example, using a scouring agent 0.5 to 2.0 g / L, caustic soda 1.0 to 2.0 g / L, and a chelating dispersant 0.5 to 1.0 g / L. It is carried out by using L and treating at a bath ratio of 1:10 to 15 and 90 to 95 ° C for 45 to 90 minutes. As specifically described in the following examples, when the bleaching method of the present invention is carried out, even a cloth before scouring can obtain almost the same bleaching effect as a cloth after scouring. Moreover, the cloth before scouring exhibits water repellency due to impurities such as wax (wax), but when the bleaching method of the present invention is applied to the cloth before scouring, the cloth becomes hydrophilic. Therefore, by employing the bleaching method of the present invention, the scouring step can be omitted, and a chemical used in the scouring step becomes unnecessary, which is very advantageous in terms of cost and environmental load.
上記のとおり、本発明はまた、植物性繊維を含む布の漂白後の色戻りを低減する方法であって、漂白後の前記布を還元剤で処理することを含む、漂白後の布の色戻りを低減する方法をも提供する。 As noted above, the present invention is also a method of reducing the color reversion of a fabric containing vegetable fibers after bleaching, comprising treating the bleached fabric with a reducing agent, comprising: It also provides a way to reduce the return.
色戻りを低減させる、漂白後の布の漂白方法は、特に限定されないが、光照射を含む方法により漂白したものが好ましく、特に、上記本発明の漂白方法により漂白したものが好ましい。 The method for bleaching the bleached cloth for reducing the color return is not particularly limited, but is preferably bleached by a method including light irradiation, and particularly preferably bleached by the bleaching method of the present invention.
還元剤としては、色戻りを低減できるものであれば特に限定されないが、ヒドロキシメタンスルフィン酸ナトリウム（ロンガリット）が好ましい。 The reducing agent is not particularly limited as long as it can reduce color return, but sodium hydroxymethanesulfinate (Rongalit) is preferable.
還元処理は、例えば、通常、濃度0.1重量％〜0.5重量％程度、好ましくは0.5重量％の還元剤溶液と漂白後の布を接触させることにより行うことができる。接触は、浸漬、噴霧、塗布等の方法により行うことができる。還元処理の時間は、色戻り低減効果が得られる時間であれば、特に限定されないが、通常、30分間〜60分間程度、好ましくは60分間程度である。また、還元剤による処理温度は、特に限定されないが、90〜100℃である。 The reduction treatment can be performed, for example, by bringing the bleached cloth into contact with a reducing agent solution having a concentration of about 0.1% to 0.5% by weight, preferably 0.5% by weight. The contact can be performed by a method such as dipping, spraying, or coating. The time of the reduction treatment is not particularly limited as long as the color return reduction effect can be obtained, but is usually about 30 minutes to 60 minutes, preferably about 60 minutes. The treatment temperature with the reducing agent is not particularly limited, but is 90 to 100 ° C.
以下、本発明を実施例に基づき具体的に説明する。もっとも、本発明は下記実施例に限定されるものではない。 Hereinafter, the present invention will be specifically described based on examples. However, the present invention is not limited to the following examples.
参考例１ 綿布の精練
寸法が5cm x 5cmの綿布試料を精練した。精練は次のようにして行った。マーポンＦＬ-７０Ｎ（松本油脂製薬株式会社製、精練剤）１．０ｇ/Ｌ、苛性ソーダ１．０ｇ/Ｌ、マーポンＡ−４７（松本油脂製薬株式会社製、キレート分散剤）０．５ｇ/Ｌを使用し、浴比１：１５、９０℃×６０分で処理を行った。
Reference Example 1 Refinement of cotton cloth A cotton cloth sample having dimensions of 5 cm x 5 cm was refined. The scouring was performed as follows. 1.0 g / L of Marpon FL-70N (manufactured by Matsumoto Yushi Seiyaku Co., Ltd., 1.0 g / L of caustic soda) and 0.5 g / L of Marpon A-47 (chelate dispersant, manufactured by Matsumoto Yushi Seiyaku Co., Ltd.) The treatment was performed at a bath ratio of 1:15 and at 90 ° C. for 60 minutes.
実施例１
１． 綿布の漂白
参考例１で精練した綿布試料を本発明の方法により漂白した。市販のホウ素ドープダイヤモンド電極を用いたオゾン水生成装置により、連続的にオゾン水を生成させ、装置から排出される、生成直後のオゾン水を綿布試料に連続的にかけ流した。同時に、市販のスポット紫外線照射装置により、綿布試料の一部領域に紫外線を照射した。照射した紫外線強度は、波長310nm〜380nmの光の合計として、175mW/cm2であった。漂白処理は、１５分、３０分、４５分又は６０分行った。一方、比較のため、同じ綿布を従来の方法で漂白した。従来法による漂白は、過酸化水素水（３５％）５．０〜１５．０cc/L、苛性ソーダ１．０〜３．０ｇ/L、過酸化水素安定剤０．３〜１．０ｇ/L、浸透剤０．５〜１．０ｇ/Lを使用し、浴比１：１０〜１５、９０℃×３０〜９０分の処理することにより行った。
Example 1
1. Bleaching of Cotton Fabric The cotton fabric sample scoured in Reference Example 1 was bleached by the method of the present invention. Ozone water was continuously generated by a commercially available ozone water generation device using a boron-doped diamond electrode, and the ozone water immediately after generation, which was discharged from the device, was continuously flowed over the cotton cloth sample. At the same time, ultraviolet rays were applied to a partial area of the cotton cloth sample using a commercially available spot ultraviolet irradiation apparatus. The intensity of the irradiated ultraviolet light was 175 mW / cm 2 as a sum of light having a wavelength of 310 nm to 380 nm. The bleaching treatment was performed for 15 minutes, 30 minutes, 45 minutes or 60 minutes. On the other hand, for comparison, the same cotton cloth was bleached by a conventional method. The bleaching by the conventional method is performed by using 5.0% to 15.0 cc / L of hydrogen peroxide (35%), 1.0 to 3.0 g / L of caustic soda, 0.3 to 1.0 g / L of hydrogen peroxide stabilizer, This was carried out by using a penetrant of 0.5 to 1.0 g / L and treating at a bath ratio of 1 to 15 at 90 ° C. for 30 to 90 minutes.
２． 結果
各種波長の光を漂白後の綿布試料に照射し、反射率を測定した。横軸に照射光の波長、縦軸に反射率をとったグラフを図１に示す。図１に示されるように、未漂白処理の綿布と比較して、本発明の方法により漂白した綿布試料では、漂白処理時間依存的に反射率が大きくなり、漂白が達成されることが示された。また、漂白処理時間が６０分の場合、従来法による漂白と同等の漂白効果が達成された。すなわち、本発明の漂白方法によれば、従来法のように次亜塩素酸ナトリウムのような環境に負荷を与える薬剤を用いることなく、同等の漂白効果を達成することができることが明らかになった。
2. Results Light of various wavelengths was irradiated to the bleached cotton cloth sample, and the reflectance was measured. FIG. 1 shows a graph in which the horizontal axis represents the wavelength of the irradiation light and the vertical axis represents the reflectance. As shown in FIG. 1, as compared with the unbleached cotton fabric, the reflectance of the cotton fabric sample bleached by the method of the present invention was increased depending on the bleaching time, indicating that bleaching was achieved. Was. When the bleaching treatment time was 60 minutes, a bleaching effect equivalent to that of the conventional method was achieved. That is, according to the bleaching method of the present invention, it has become clear that equivalent bleaching effects can be achieved without using an environmentally harmful agent such as sodium hypochlorite as in the conventional method. .
実施例２
参考例１の精練工程を経ていない綿布試料及び精練工程を経た綿布試料について、実施例１と同じ操作を行った。ただし、漂白処理時間は３０分又は６０分とした。実施例１と同様、照射光の波長と反射率の関係を調べた。結果を図２に示す。
Example 2
The same operation as in Example 1 was performed on the cotton cloth sample that had not undergone the scouring step and the cotton cloth sample that had undergone the scouring step in Reference Example 1. However, the bleaching treatment time was 30 minutes or 60 minutes. As in Example 1, the relationship between the wavelength of the irradiation light and the reflectance was examined. The results are shown in FIG.
図２中、実線は、精練処理後の綿布試料を漂白処理した試料についての結果を示し、破線は、精練処理していない綿布試料を漂白処理した試料についての結果を示す。図２に示されるように、精練処理の有無にかかわらず、反射率はほぼ同じであり、本発明の方法によれば、精練工程を経ていない綿布についても、精練工程後の綿布と同様な漂白効果が発揮されることが明らかになった。さらに、精練工程を経ていない、未漂白処理の綿布試料に水滴を滴下したところ、綿布試料に水は染みこまずに滴状のまま綿布試料上に留まったが、３０分間漂白処理した後の試料に同様に水滴を滴下したところ、水は布に染みこんで広がった（図３参照）。このことから、未精練綿布は撥水性であるが、本発明の漂白処理を行うことにより、撥水性がなくなり、親水性に変化することが明らかになった。このように、精練工程の有無にかかわらず、同様な漂白効果と親水性が得られるので、本発明の漂白方法を使用することにより、精練工程を省略できることが示された。 In FIG. 2, the solid line shows the result of the bleached cotton cloth sample after the scouring treatment, and the broken line shows the result of the bleached cotton cloth sample without the scouring treatment. As shown in FIG. 2, the reflectance is almost the same irrespective of the presence or absence of the scouring treatment, and according to the method of the present invention, the same bleaching as that of the cotton cloth after the scouring step is performed on the cotton cloth that has not been subjected to the scouring step. It became clear that the effect was exhibited. Furthermore, when water droplets were dropped on an unbleached cotton fabric sample that had not undergone the scouring process, water remained on the cotton fabric sample in a droplet form without seeping into the cotton fabric sample, but the sample after bleaching for 30 minutes Similarly, when water droplets were dropped, the water soaked into the cloth and spread (see FIG. 3). From this fact, it has been clarified that the unrefined cotton fabric is water-repellent, but by performing the bleaching treatment of the present invention, the water-repellency disappears and the hydrophilicity changes. As described above, the same bleaching effect and hydrophilicity can be obtained regardless of the presence or absence of the scouring step. Thus, it was shown that the scouring step can be omitted by using the bleaching method of the present invention.
実施例３、比較例１、比較例２
試料を麻布（精練後）に変更した点を除き、実施例１と同様な処理を行った。さらに、比較のため、オゾン水に代えて水道水を６０分間かけ流した例（比較例１）及び紫外線を照射せずにオゾン水のみを６０分間かけ流した例（比較例２）も実施した。また、実施例１と同様、従来法による漂白も行った。実施例１と同様、照射光の波長と反射率の関係を調べた。結果を図４に示す。
Example 3, Comparative Example 1, Comparative Example 2
The same treatment as in Example 1 was performed except that the sample was changed to Azabu (after scouring). Further, for comparison, an example in which tap water was flowed for 60 minutes instead of ozone water (Comparative Example 1) and an example in which only ozone water was flowed for 60 minutes without irradiation with ultraviolet rays (Comparative Example 2) were also implemented. . Also, as in Example 1, bleaching was performed by a conventional method. As in Example 1, the relationship between the wavelength of the irradiation light and the reflectance was examined. FIG. 4 shows the results.
図４中、実線で示されている結果は、下から順に、未漂白処理、紫外線＋水道水６０分、オゾン水のみ６０分、オゾン水＋紫外線６０分、オゾン水＋紫外線１２０分の結果を示し、破線は、従来の漂白方法で漂白した試料についての結果を示す。これらの結果から、本発明の方法により６０分間漂白した場合には、紫外線照射及びオゾン水処理のいずれか一方のみを６０分間行った場合に比較して優れた漂白効果が達成された。また、漂白処理を１２０分間行った場合には、少なくとも可視光領域については、従来の漂白方法と同程度の漂白効果が得られた。 In FIG. 4, the results shown by solid lines are, in order from the bottom, the results of unbleaching treatment, ultraviolet light + tap water for 60 minutes, ozone water only for 60 minutes, ozone water + ultraviolet light for 60 minutes, and ozone water + ultraviolet light for 120 minutes. The dashed lines show the results for samples bleached by conventional bleaching methods. From these results, when the bleaching was performed for 60 minutes by the method of the present invention, a superior bleaching effect was achieved as compared with the case where only one of the ultraviolet irradiation and the ozone water treatment was performed for 60 minutes. When the bleaching treatment was performed for 120 minutes, at least in the visible light region, a bleaching effect comparable to that of the conventional bleaching method was obtained.
実施例４ 比較例３
過酸化水素水処理と紫外線照射との同時処理により精練後の綿布を漂白した。過酸化水素水処理の具体的な条件は、以下の通りであった。30%過酸化水素水に浸漬させ、高圧水銀ランプにて紫外線を照射した。紫外線の強度は、6 mW/cm2であった。処理時間は、60分間であった。漂白後の綿布をロンガリットで処理した。処理の具体的な条件は、次のとおりであった。酢酸を１滴加えpH=4程度に調整したロンガリット0.5重量％水溶液に浸漬し、100℃で１時間処理した。ロンガリット処理後、綿布を２００℃、１分間加熱した。漂白前、漂白処理後、及び加熱処理後における綿布の白色度を測定した。一方、漂白処理後、ロンガリット処理を行わなかった綿布（比較例３）についても、漂白前、漂白処理後、及び加熱処理後における綿布の白色度を測定した。結果を図５に示す。
Example 4 Comparative Example 3
The scoured cotton cloth was bleached by simultaneous treatment of hydrogen peroxide solution and ultraviolet irradiation. The specific conditions of the hydrogen peroxide solution treatment were as follows. It was immersed in a 30% hydrogen peroxide solution and irradiated with ultraviolet rays from a high-pressure mercury lamp. Ultraviolet light intensity was 6 mW / cm 2 . The processing time was 60 minutes. The bleached cotton fabric was treated with Rongalite. The specific conditions of the treatment were as follows. One drop of acetic acid was added, and the resultant was immersed in a 0.5% by weight Rongalite aqueous solution adjusted to pH = 4, and treated at 100 ° C. for 1 hour. After the Rongalit treatment, the cotton cloth was heated at 200 ° C. for 1 minute. The whiteness of the cotton fabric was measured before bleaching, after bleaching, and after heat treatment. On the other hand, the whiteness of the cotton fabric which was not subjected to the Rongalit treatment after the bleaching treatment (Comparative Example 3) was measured before bleaching, after the bleaching treatment, and after the heat treatment. FIG. 5 shows the results.
図５に示されるように、ロンガリット処理により、加熱後の白色度の減少が大幅に低減された。水素化ホウ素ナトリウムにより色戻りが抑制されていることは既に知られているが、分解性が高く、水と反応して発火の危険があること、また価格が高いため、工業的に大量に使うのは困難である。それに対して、本法は安価で染色工業で広く用いられているロンガリットを使う点で非常に優れている。 As shown in FIG. 5, the decrease in whiteness after heating was significantly reduced by the Rongalit treatment. It is already known that sodium borohydride suppresses color reversion, but it is highly decomposable, reacts with water and may ignite, and is expensive, so it is used in large quantities industrially It is difficult. On the other hand, the present method is very excellent in using Rongalite, which is inexpensive and widely used in the dyeing industry.
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| WO2022015179A1 (en) | 2020-07-13 | 2022-01-20 | Firma Handlowo-Usługowa Instbud Stanisław Boguta Spółka Jawna | The multi-layer composite sleeve, in particular for trenchless pipeline rehabilitation |
| DE112021000917T5 (en) | 2020-02-07 | 2022-11-17 | Rohm Co., Ltd. | SEMICONDUCTOR DEVICE |
| CN116575227A (en) * | 2023-06-29 | 2023-08-11 | 河北三利毛纺有限公司 | Novel normal-temperature active water continuous bleaching auxiliary process |
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| JP4192201B2 (en) * | 2007-02-27 | 2008-12-10 | 茂則 青野 | Process for producing bleached fiber products and equipment used therefor |
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| JPH03130463A (en) * | 1989-10-12 | 1991-06-04 | Toyobo Co Ltd | Method for scouring textile product |
| JP2006346203A (en) * | 2005-06-16 | 2006-12-28 | Permelec Electrode Ltd | Method of sterilization and electrolyzed water spraying device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| DE112021000917T5 (en) | 2020-02-07 | 2022-11-17 | Rohm Co., Ltd. | SEMICONDUCTOR DEVICE |
| WO2022015179A1 (en) | 2020-07-13 | 2022-01-20 | Firma Handlowo-Usługowa Instbud Stanisław Boguta Spółka Jawna | The multi-layer composite sleeve, in particular for trenchless pipeline rehabilitation |
| CN116575227A (en) * | 2023-06-29 | 2023-08-11 | 河北三利毛纺有限公司 | Novel normal-temperature active water continuous bleaching auxiliary process |
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