JPH1147585A - Oxygen scavenger - Google Patents
Oxygen scavengerInfo
- Publication number
- JPH1147585A JPH1147585A JP20476697A JP20476697A JPH1147585A JP H1147585 A JPH1147585 A JP H1147585A JP 20476697 A JP20476697 A JP 20476697A JP 20476697 A JP20476697 A JP 20476697A JP H1147585 A JPH1147585 A JP H1147585A
- Authority
- JP
- Japan
- Prior art keywords
- iron powder
- oxygen
- electrolyte
- surface area
- powder
- 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.)
- Pending
Links
Landscapes
- Food Preservation Except Freezing, Refrigeration, And Drying (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、優れた酸素吸収性
能を持つ鉄粉及び電解質より成る脱酸素剤に関する。更
に詳しくは、原料鉄粉を部分酸化して特定の酸素含有量
と比表面積を持たせることにより酸素吸収性能を向上さ
せた脱酸素剤に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deoxidizer comprising iron powder and electrolyte having excellent oxygen absorption performance. More specifically, the present invention relates to a deoxidizer in which oxygen absorption performance is improved by partially oxidizing raw iron powder to have a specific oxygen content and a specific surface area.
【０００２】[0002]
【従来の技術】鉄粉を主剤とする脱酸素剤は、食品など
の酸素の影響を受けやすい物品の保存に広く使用されて
いる。従来、良好な酸素吸収性能を得る手段として、例
えば特開昭５３−１４１８５号公報では、金属粉をハロ
ゲン化金属で被覆することにより高い酸素吸収性能を得
る方法等が知られている。2. Description of the Related Art Oxygen absorbers containing iron powder as a main component are widely used for preserving oxygen-sensitive articles such as foods. Conventionally, as a means for obtaining good oxygen absorption performance, for example, Japanese Patent Application Laid-Open No. 53-14185 discloses a method of obtaining high oxygen absorption performance by coating metal powder with a metal halide.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、ハロゲ
ン化金属を被覆した鉄粉からなる従来の脱酸素剤は、酸
素吸収初期の酸素吸収速度が必ずしも充分ではなく、物
品保存の立ち上がり時の酸素吸収速度が遅いために、食
品等への適用分野が制限されたり、脱酸素状態に達する
までの適用食品等の劣化が大きくなる等の問題があっ
た。本発明は、前記問題を解決し、酸素吸収性能を改良
した鉄粉及び電解質より成る脱酸素剤を提供することを
目的とする。However, the conventional oxygen absorber composed of iron powder coated with a metal halide does not always have a sufficient oxygen absorption rate at the initial stage of oxygen absorption, and the oxygen absorption rate at the time of starting storage of articles. However, there are problems that the application field to foods and the like is limited, and the deterioration of the applied foods and the like until reaching a deoxygenated state is increased. An object of the present invention is to solve the above problems and to provide a deoxidizer comprising iron powder and an electrolyte having improved oxygen absorption performance.
【０００４】[0004]
【課題を解決するための手段】本発明者らは上記課題を
解決するために鋭意検討した結果、原料鉄粉の表面を予
め部分酸化して比表面積を大きくすることにより、立ち
上がり時から酸素吸収速度の速い脱酸素剤が得られるこ
とを見出し、本発明を完成するに至った。Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems. As a result, the surface of the raw iron powder was partially oxidized in advance to increase the specific surface area, so that the oxygen absorption from the start-up time was improved. The inventors have found that a high-speed oxygen scavenger can be obtained, and have completed the present invention.
【０００５】本発明は、酸素含有量が０．７〜７重量％
であり且つ比表面積が２００〜２０００ｍ2/kgである表
面を部分酸化した鉄粉及び電解質より成る脱酸素剤に関
する。According to the present invention, the oxygen content is 0.7 to 7% by weight.
And an oxygen scavenger comprising an electrolyte and an electrolyte having a specific surface area of 200 to 2,000 m 2 / kg and a partially oxidized iron surface.
【０００６】本発明では、鉄粉に電解質を０．１〜４重
量％被覆することが好ましい。[0006] In the present invention, it is preferable that the iron powder is coated with 0.1 to 4% by weight of an electrolyte.
【０００７】本発明では、表面を部分酸化した鉄粉が、
酸素含有量が０．５重量％以下であり且つ比表面積が１
５０ｍ2/kg以下である鉄粉を部分酸化したものであるこ
とが好ましい。In the present invention, the iron powder whose surface is partially oxidized is
The oxygen content is 0.5% by weight or less and the specific surface area is 1
It is preferable that iron powder of 50 m 2 / kg or less is partially oxidized.
【０００８】[0008]
【発明の実施の形態】本発明では、主たる酸素吸収組成
物が鉄粉と電解質から成り、主剤の鉄粉が水と電解質の
共存下に酸素を吸収する反応を利用するものである。本
発明では、主たる酸素吸収組成物である鉄粉と電解質の
他に、必要に応じて、脱臭剤、流動性向上剤等の助剤を
加えることができる。この他、炭酸ガスの吸収剤または
発生剤あるいはアルコールの発生剤を加えて、炭酸ガス
の吸収または発生機能あるいはアルコールの発生機能を
付与することもできる。BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a main oxygen absorbing composition comprises iron powder and an electrolyte, and the iron powder as a main agent utilizes a reaction of absorbing oxygen in the presence of water and an electrolyte. In the present invention, auxiliary agents such as a deodorant and a fluidity improver can be added, if necessary, in addition to the iron powder and the electrolyte, which are the main oxygen absorbing compositions. In addition, a carbon dioxide absorbing agent or a generating agent or an alcohol generating agent can be added to impart a carbon dioxide absorbing or generating function or an alcohol generating function.
【０００９】本発明では、部分酸化前の原料鉄粉とし
て、還元鉄粉、電解鉄粉、噴霧鉄粉、破砕鉄粉等が用い
られるが、酸素吸収性能が良好なことから還元鉄粉と噴
霧鉄粉が好ましく用いられる。鉄粉の純度に関しては、
本発明の目的が達せられる限り特に制限はないが、高い
酸素吸収能力を得るためには、鉄粉の純度は高い方が好
ましい。部分酸化前の鉄粉は、酸素含有量が０．５重量
％以下であり且つ比表面積が１５０ｍ2/kg以下であるも
のが好ましい。また、原料鉄粉の粒度は１０メッシュ以
下が好ましく、５０メッシュ以下がより好ましい。In the present invention, reduced iron powder, electrolytic iron powder, sprayed iron powder, crushed iron powder and the like are used as the raw iron powder before partial oxidation. Iron powder is preferably used. Regarding the purity of iron powder,
There is no particular limitation as long as the object of the present invention can be achieved, but in order to obtain a high oxygen absorption capacity, it is preferable that the purity of the iron powder is high. The iron powder before the partial oxidation preferably has an oxygen content of 0.5% by weight or less and a specific surface area of 150 m 2 / kg or less. Also, the particle size of the raw iron powder is preferably 10 mesh or less, more preferably 50 mesh or less.
【００１０】本発明においては、上記原料鉄粉を部分酸
化して、酸素含有量が０．７〜７重量％であり且つ比表
面積が２００〜２０００ｍ2/kgである表面を部分酸化し
た鉄粉とする。部分酸化が不充分なため酸素含有量が
０．７重量％に達せず比表面積が２００ｍ2/kg以下の場
合には、鉄粉表面の部分酸化の度合いが不充分であり、
脱酸素剤としたときの酸化反応が活性化されず、立ち上
がり時の酸素吸収速度が速くならない。また部分酸化を
進めて酸素含有量が７重量％を超え比表面積が２０００
ｍ2/kg以上になっても、より以上の酸素吸収速度の向上
は望めず、酸素吸収能力も低下する。尚、酸素含有量が
０．７〜７重量％であっても例えば比表面積が２００ｍ
2/kg未満の場合には、酸素吸収速度の改善は期待できな
い。In the present invention, the above iron powder is partially oxidized to partially oxidize the surface thereof having an oxygen content of 0.7 to 7% by weight and a specific surface area of 200 to 2000 m 2 / kg. And When the oxygen content does not reach 0.7% by weight and the specific surface area is 200 m 2 / kg or less due to insufficient partial oxidation, the degree of partial oxidation of the iron powder surface is insufficient.
The oxidation reaction when used as a deoxidizer is not activated, and the oxygen absorption rate at the time of rising does not increase. In addition, the partial oxidation promoted the oxygen content to exceed 7% by weight and the specific surface area to 2000.
Even at m 2 / kg or more, it is not possible to expect a further improvement in the oxygen absorption rate, and the oxygen absorption capacity also decreases. Even if the oxygen content is 0.7 to 7% by weight, for example, the specific surface area is 200 m
If it is less than 2 / kg, no improvement in oxygen absorption rate can be expected.
【００１１】鉄粉の部分酸化は、電解質の共存下に鉄粉
を大気中の酸素と反応させることにより行う。例えば、
次の方法を適宜選び、脱酸素剤の製造工程を利用して鉄
粉の部分酸化を行うことができる。 （１）鉄粉と粉末または粒状の電解質（鉄粉に対し０．
１〜１０重量％）との混合物を湿度６０％以上の大気中
で常温または加温下に所定時間撹拌混合する。 （２）（１）の方法において、鉄粉と粉末または粒状の
電解質の混合物を所定量の空気とともに容器内に密封
し、水の共存下に雰囲気中の酸素濃度が０．１％以下に
なるまで撹拌混合する。 （３）大気中で、鉄粉を撹拌しながら電解質水溶液（鉄
粉に対し０．１〜４重量％の電解質を水に溶解し、濃度
を１〜７０％としたもの）を散布、含浸させ、常温また
は加温下に所定時間撹拌混合する。 （４）（３）の方法において、鉄粉と電解質水溶液の混
合物を所定量の空気とともに容器内に密封して雰囲気中
の酸素濃度が０．１％以下になるまで撹拌混合する。 （５）真空下または窒素雰囲気下で、鉄粉を撹拌しなが
ら電解質水溶液（鉄粉に対し０．１〜４重量％の電解質
を水に溶解し、濃度を１〜７０％としたもの）を散布、
含浸させ、乾燥した後、該鉄粉を湿度６０％以上の大気
中で常温または加温下に所定時間撹拌混合する。 （６）（５）の方法において、鉄粉に電解質水溶液を含
浸して乾燥させたものを所定量の空気とともに容器内に
密封して水の共存下に雰囲気中の酸素濃度が０．１％以
下になるまで撹拌混合する。The partial oxidation of iron powder is carried out by reacting iron powder with atmospheric oxygen in the presence of an electrolyte. For example,
The following method is appropriately selected, and partial oxidation of the iron powder can be performed by utilizing the manufacturing process of the oxygen scavenger. (1) Iron powder and powder or granular electrolyte (0.1% for iron powder)
(1 to 10% by weight) in an atmosphere having a humidity of 60% or more at room temperature or under heating for a predetermined period of time. (2) In the method of (1), a mixture of iron powder and powdery or granular electrolyte is sealed in a container together with a predetermined amount of air, and the oxygen concentration in the atmosphere becomes 0.1% or less in the presence of water. Mix until stirring. (3) Spraying and impregnating an aqueous electrolyte solution (concentration of 1 to 70% by dissolving 0.1 to 4% by weight of an electrolyte with respect to the iron powder in water to a concentration of 1 to 70%) while stirring the iron powder in the air The mixture is stirred and mixed at room temperature or under heating for a predetermined time. (4) In the method of (3), a mixture of the iron powder and the aqueous electrolyte solution is sealed in a container together with a predetermined amount of air, and the mixture is stirred and mixed until the oxygen concentration in the atmosphere becomes 0.1% or less. (5) While stirring the iron powder under vacuum or a nitrogen atmosphere, an aqueous electrolyte solution (a solution in which 0.1 to 4% by weight of an electrolyte is dissolved in water with respect to the iron powder to a concentration of 1 to 70%) is added. Spraying,
After impregnating and drying, the iron powder is stirred and mixed for a predetermined time at room temperature or under heating in an atmosphere having a humidity of 60% or more. (6) In the method of (5), iron powder impregnated with an aqueous electrolyte solution and dried is sealed in a container together with a predetermined amount of air, and the oxygen concentration in the atmosphere is 0.1% in the presence of water. Stir and mix until below.
【００１２】前記（１）〜（６）の各方法においては、
主剤の鉄粉に対する電解質量、水分量、湿度、反応時間
等の条件を適宜設定することにより、鉄粉中の酸素含有
量が０．７〜７重量％の範囲になるように部分酸化の度
合いが調整される。尚、撹拌は混合物を静置しておき時
々撹拌する方法であってもよいが、鉄粉の表面を均一に
部分酸化させるためには、常時撹拌混合しながら酸化す
ることが好ましい。In each of the above methods (1) to (6),
The degree of partial oxidation is adjusted by appropriately setting conditions such as the electrolytic mass, water content, humidity, and reaction time of the main agent with respect to the iron powder so that the oxygen content in the iron powder is in the range of 0.7 to 7% by weight. Is adjusted. The stirring may be a method in which the mixture is allowed to stand and sometimes stirred, but in order to uniformly oxidize the surface of the iron powder, it is preferable to oxidize while constantly stirring and mixing.
【００１３】尚、前記（１）〜（６）の各方法により部
分酸化した鉄粉は、水分を含んでいることがある。その
ままでの使用も可能であるが、ハンドリング上の問題か
ら乾燥状態にすることが好ましい。部分酸化した鉄粉を
乾燥状態にするためには、前記各方法の最後の工程で、
大気下に加熱するか、常温または加温下に吸引脱気す
る、または酸化熱を利用して加熱状態を保つ等の方法が
採用できる。The iron powder partially oxidized by each of the above methods (1) to (6) may contain moisture. Although it is possible to use it as it is, it is preferable to make it dry due to handling problems. In order to make the partially oxidized iron powder dry, in the last step of each of the above methods,
Methods such as heating to the atmosphere, suction and deaeration at room temperature or under heating, or maintaining a heated state by using oxidizing heat can be employed.
【００１４】本発明に用いられる電解質としては、金属
のハロゲン化物、炭酸塩、硫酸塩、水酸化物等が挙げら
れるが、ハロゲン化金属が好ましく用いられる。ハロゲ
ン化金属の中でも、塩化ナトリウム、塩化カリウム、塩
化カルシウム及び塩化マグネシウムがより好ましい。Examples of the electrolyte used in the present invention include metal halides, carbonates, sulfates, and hydroxides, and metal halides are preferably used. Among the metal halides, sodium chloride, potassium chloride, calcium chloride and magnesium chloride are more preferred.
【００１５】電解質は粉末又は粒状のものを用いて鉄粉
と混合して使用してもよいが、電解質の水溶液を用いて
鉄粉表面に電解質を分散させた後に水分を除去した被覆
鉄粉（コーティング鉄粉）として使用することが好まし
い。電解質は、通常、鉄粉に対して０．１〜１０重量％
の範囲で用いられるが、被覆することによって配合量を
減らすことができる。被覆による場合の電解質量は、鉄
粉に対し０．１〜４重量％が好ましい。電解質量が前記
の範囲より少ない場合には酸素吸収速度が遅くなり、一
方、前記の範囲より多い場合には吸湿して水分が鉄粉表
面を覆ってしまい、酸素吸収反応を停止させることがあ
るため、いずれにしても好ましくない。The electrolyte may be used in the form of a powder or granules, which may be mixed with iron powder. However, the electrolyte is dispersed on the surface of the iron powder using an aqueous solution of the electrolyte, and then the coated iron powder (water) is removed. It is preferably used as coated iron powder). The electrolyte is usually 0.1 to 10% by weight based on the iron powder.
Is used in the range, but the amount can be reduced by coating. The electrolytic mass in the case of coating is preferably 0.1 to 4% by weight based on the iron powder. When the electrolytic mass is less than the above range, the oxygen absorption rate becomes slow.On the other hand, when the electrolytic mass is more than the above range, moisture is absorbed and moisture covers the iron powder surface, and the oxygen absorption reaction may be stopped. Therefore, it is not preferable in any case.
【００１６】電解質を被覆する方法には特に制限はな
く、鉄粉の部分酸化前、部分酸化後、あるいは部分酸化
と同時に被覆する方法の何れであってもよい。また、部
分酸化した鉄粉と同様に被覆鉄粉が水分を含んでいると
取り扱い性が悪くなるため、前述の方法で鉄粉の部分酸
化及び電解質の被覆の最後の工程で鉄粉を乾燥すること
が好ましい。There is no particular limitation on the method of coating the electrolyte, and any method may be used before, after, or simultaneously with the partial oxidation of the iron powder. In addition, the iron powder is dried in the last step of the partial oxidation of the iron powder and the coating of the electrolyte by the above-described method, because the handleability becomes poor when the coated iron powder contains moisture as in the partially oxidized iron powder. Is preferred.
【００１７】本発明の脱酸素剤は、通常、部分酸化した
鉄粉及び電解質を含む酸素吸収組成物を通気性包装材料
に包装して脱酸素剤包装体として使用される。また本発
明の脱酸素剤は、前記酸素吸収組成物を熱可塑性樹脂と
混合して酸素吸収性樹脂組成物とし、シート状脱酸素剤
として、あるいは他の包装材料を積層し脱酸素性包装材
料や容器に加工して利用することもできる。The oxygen absorber of the present invention is usually used as an oxygen absorber package by packaging an oxygen absorbing composition containing partially oxidized iron powder and an electrolyte in a gas permeable packaging material. Further, the oxygen absorbing composition of the present invention is obtained by mixing the oxygen absorbing composition with a thermoplastic resin to form an oxygen absorbing resin composition, as a sheet-shaped oxygen absorbing agent, or by laminating another packaging material. It can also be used after processing into a container.
【００１８】特に本発明の脱酸素剤は、水分を含まない
酸素吸収組成物の場合には水分依存型脱酸素剤（食品等
から蒸散する水分を利用して酸素吸収する脱酸素剤）と
して、また、水分供与体を加えるなどの手段により水分
を含ませた酸素吸収組成物の場合には自力反応型脱酸素
剤（脱酸素剤中に予め存在する水分を利用して酸素吸収
する脱酸素剤）として使用することができる。In particular, in the case of an oxygen absorbing composition containing no water, the oxygen absorber of the present invention is a water-dependent oxygen absorber (an oxygen absorber that absorbs oxygen by utilizing moisture evaporated from foods or the like). In the case of an oxygen-absorbing composition containing water by a means such as adding a water donor, a self-reactive oxygen absorber (an oxygen absorber that absorbs oxygen by utilizing moisture previously present in the oxygen absorber) ) Can be used.
【００１９】[0019]
＜実施例１＞大気中で、酸素含有量０．０重量％、比表
面積７０ｍ2/kg、粒度１００メッシュ以下の鉄粉１００
ｇを撹拌しながら、５０％塩化カルシウム水溶液４ｇを
散布、含浸させ、その状態で３０分間約１００℃に加熱
した後冷却し、塩化カルシウムを被覆した部分酸化鉄粉
を乾燥状態で得た。該部分酸化鉄粉の水分含有量は０．
２重量％であり、赤外線吸収法で分析した酸素含有量は
１．２重量％、Ｂ．Ｅ．Ｔ．法で分析した比表面積は５
００ｍ2/kgであった。また、ＳＥＭにより表面分析した
ところ、該鉄粉の表面が酸化されていることが認められ
た。該部分酸化鉄粉０．７ｇを通気性の不織布（商品
名：タイベック、デュポン社製）製の小袋（寸法４０mm
×４０mm）に充填して脱酸素剤包装体とした。これを水
１０mlを含浸した脱脂綿とともにＫＯＮ／ＰＥ( 塩化ビ
ニリデンコート延伸ナイロン／ポリエチレン) 製の袋に
入れ、袋内の空気が２５０mlとなるようにヒートシール
により密封した。次に、この脱酸素剤包装体の密封袋を
温度２５℃下に保持しておき、袋内の酸素濃度をジルコ
ニア式酸素濃度計で経時的に分析した。酸素吸収の様子
を図１に示す。<Example 1> Iron powder 100 having an oxygen content of 0.0% by weight, a specific surface area of 70 m 2 / kg and a particle size of 100 mesh or less in the atmosphere.
While stirring g, 4 g of a 50% calcium chloride aqueous solution was sprayed and impregnated, heated in this state to about 100 ° C. for 30 minutes, and then cooled to obtain a calcium chloride-coated partial iron oxide powder in a dry state. The partial iron oxide powder has a water content of 0.1.
2% by weight, the oxygen content analyzed by infrared absorption method was 1.2% by weight, E. FIG. T. Surface area analyzed by the method is 5
00 m 2 / kg. In addition, surface analysis by SEM showed that the surface of the iron powder was oxidized. 0.7 g of the partial iron oxide powder is poured into a small bag (dimensions: 40 mm) made of a breathable nonwoven fabric (trade name: Tyvek, manufactured by DuPont).
× 40 mm) to give a package of oxygen scavenger. This was put in a bag made of KON / PE (vinylidene chloride coated stretched nylon / polyethylene) together with absorbent cotton impregnated with 10 ml of water, and sealed by heat sealing so that the air in the bag became 250 ml. Next, the sealed bag of the oxygen scavenger package was kept at a temperature of 25 ° C., and the oxygen concentration in the bag was analyzed with a zirconia oxygen analyzer over time. The state of oxygen absorption is shown in FIG.
【００２０】＜実施例２＞３０mmHgの真空下に、酸素含
有量０．０重量％、比表面積７０ｍ2/kg、粒度１００メ
ッシュ以下の鉄粉１００ｇを撹拌しながら５０％塩化カ
ルシウム水溶液４ｇを散布、含浸させ、その状態で１時
間約１００℃に加熱した後冷却し、塩化カルシウム被覆
鉄粉を乾燥状態で得た。次に、該鉄粉を水１０mlを含浸
した脱脂綿とともにＫＯＮ／ＰＥ製の袋に入れ、袋内の
空気が１５００mlとなるようにヒートシールにより密封
した後、鉄粉を撹拌しながら袋内の酸素濃度が０．１％
以下になるまで２５℃に保持して、部分酸化鉄粉を調製
した。該部分酸化鉄粉の赤外線吸収法で分析した酸素含
有量は１．１重量％であり、Ｂ．Ｅ．Ｔ．法で分析した
比表面積は１０００ｍ2/kgであった。また、ＳＥＭによ
る表面分析から、該部分酸化鉄粉の表面が酸化されてい
ることが認められた。該部分酸化鉄粉を乾燥せずにその
まま用いて、実施例１と同様に脱酸素剤包装体を作製し
て酸素吸収テストを実施した。酸素吸収の様子を図１に
示す。<Example 2> Under a vacuum of 30 mmHg, 4 g of a 50% calcium chloride aqueous solution was sprayed while stirring 100 g of iron powder having an oxygen content of 0.0 wt%, a specific surface area of 70 m 2 / kg and a particle size of 100 mesh or less. After heating at about 100 ° C. for 1 hour in that state and cooling, an iron powder coated with calcium chloride was obtained in a dry state. Next, the iron powder is put into a KON / PE bag together with absorbent cotton impregnated with 10 ml of water, and the bag is sealed by heat sealing so that the air in the bag becomes 1500 ml. 0.1% concentration
The temperature was kept at 25 ° C. until the temperature became below, to prepare a partially iron oxide powder. The oxygen content of the partial iron oxide powder analyzed by an infrared absorption method was 1.1% by weight. E. FIG. T. The specific surface area analyzed by the method was 1000 m 2 / kg. Also, surface analysis by SEM showed that the surface of the partial iron oxide powder was oxidized. The oxygen-absorbing test was performed by preparing an oxygen-absorbing agent package in the same manner as in Example 1, except that the partial iron oxide powder was used without drying. The state of oxygen absorption is shown in FIG.
【００２１】＜比較例１＞３０mmHgの真空下に、酸素含
有量０．０重量％、比表面積７０ｍ2/kg、粒度１００メ
ッシュ以下の鉄粉１００ｇを撹拌しながら５０％塩化カ
ルシウム水溶液４ｇを散布、含浸させ、その状態で１時
間約１００℃に加熱した後冷却し、塩化カルシウム被覆
鉄粉を乾燥状態で得た。該鉄粉の水分含有量は０．１重
量％であり、赤外線吸収法で分析した酸素含有量は０．
６重量％、Ｂ．Ｅ．Ｔ．法で分析した比表面積は１６０
ｍ2/kgであった。また、ＳＥＭによる表面分析から、該
鉄粉の表面はほとんど酸化されていないことが認められ
た。該鉄粉を用いて、実施例１と同様に脱酸素剤包装体
を作製して酸素吸収テストを実施した。酸素吸収の様子
を図１に示す。<Comparative Example 1> Under a vacuum of 30 mmHg, 4 g of a 50% calcium chloride aqueous solution was sprinkled while stirring 100 g of iron powder having an oxygen content of 0.0 wt%, a specific surface area of 70 m2 / kg and a particle size of 100 mesh or less. It was impregnated, heated to about 100 ° C. for 1 hour in that state, and then cooled to obtain a calcium chloride-coated iron powder in a dry state. The water content of the iron powder was 0.1% by weight, and the oxygen content analyzed by the infrared absorption method was 0.1%.
6% by weight, B.I. E. FIG. T. Specific surface area was 160
m 2 / kg. From the surface analysis by SEM, it was confirmed that the surface of the iron powder was hardly oxidized. Using the iron powder, an oxygen absorber package was prepared in the same manner as in Example 1, and an oxygen absorption test was performed. The state of oxygen absorption is shown in FIG.
【００２２】図１から明らかな様に、酸素含有量が０．
７重量％未満で比表面積が２００ｍ 2/kg未満の部分酸化
が不十分な鉄粉を使用した比較例１では、初期の酸素吸
収速度が遅いために脱酸素時間（雰囲気中の酸素が０．
１％以下に到達するまでの時間）が長いのに対して、酸
素含有量が０．７〜７重量％で比表面積が２００〜２０
００ｍ2/kgの表面を部分酸化した鉄粉を使用した実施例
１及び２では、酸素吸収初期の酸素吸収速度が速く脱酸
素時間が短い。As is evident from FIG. 1, the oxygen content is 0.1.
Less than 7% by weight and specific surface area 200m Twopartial oxidation less than / kg
In Comparative Example 1 using iron powder having insufficient oxygen absorption, the initial oxygen absorption
Since the yield rate is low, the deoxygenation time (oxygen in the atmosphere is 0.1%).
Time to reach 1% or less)
Element content is 0.7 to 7% by weight and specific surface area is 200 to 20
00mTwoExample using iron powder with partially oxidized surface of / kg
In 1 and 2, the oxygen absorption rate at the initial stage of oxygen absorption is high and deoxidation
The raw time is short.
【００２３】[0023]
【発明の効果】本発明の脱酸素剤は、初期の酸素吸収速
度が速いため脱酸素時間が短くなり、従来の脱酸素剤に
比べ広範囲の食品等の保存に適用が可能である。As described above, the oxygen absorber of the present invention has a high initial oxygen absorption rate, so that the oxygen absorption time is short, and it can be applied to storage of foods and the like in a wider range than conventional oxygen absorbers.
【図１】 実施例及び比較例の結果をまとめたグラフで
あり、袋内の酸素濃度と経過時間との関係をプロットし
たものである。FIG. 1 is a graph summarizing the results of Examples and Comparative Examples, in which the relationship between oxygen concentration in a bag and elapsed time is plotted.
Claims (3)
つ比表面積が２００〜２０００ｍ2/kgである表面を部分
酸化した鉄粉及び電解質より成る脱酸素剤。An oxygen scavenger comprising an electrolyte having an oxygen content of 0.7 to 7% by weight and a partially oxidized iron powder having a specific surface area of 200 to 2000 m 2 / kg.
ることを特徴とする請求項１記載の脱酸素剤。2. The oxygen scavenger according to claim 1, wherein 0.1 to 4% by weight of the electrolyte is coated on the iron powder.
が０．５重量％以下であり且つ比表面積が１５０ｍ2/kg
以下である鉄粉を部分酸化したものであることを特徴と
する請求項１又は請求項２記載の脱酸素剤。3. An iron powder whose surface is partially oxidized has an oxygen content of 0.5% by weight or less and a specific surface area of 150 m 2 / kg.
The oxygen scavenger according to claim 1 or 2, wherein the following iron powder is partially oxidized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20476697A JPH1147585A (en) | 1997-07-30 | 1997-07-30 | Oxygen scavenger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20476697A JPH1147585A (en) | 1997-07-30 | 1997-07-30 | Oxygen scavenger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1147585A true JPH1147585A (en) | 1999-02-23 |
Family
ID=16496001
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20476697A Pending JPH1147585A (en) | 1997-07-30 | 1997-07-30 | Oxygen scavenger |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1147585A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014030784A (en) * | 2012-08-02 | 2014-02-20 | Mitsubishi Gas Chemical Co Inc | Method for manufacturing oxygen absorbent |
| WO2017082183A1 (en) * | 2015-11-09 | 2017-05-18 | Ｄｏｗａエレクトロニクス株式会社 | Iron filings, heat source using same, and warming implement |
| JP2017089005A (en) * | 2015-11-09 | 2017-05-25 | Ｄｏｗａエレクトロニクス株式会社 | Iron powder, heat generator and heating tool using the same |
| WO2024014023A1 (en) * | 2022-07-11 | 2024-01-18 | Ｊｆｅスチール株式会社 | Iron-based powder for oxygen reactant, and oxygen reactant |
| WO2024014022A1 (en) * | 2022-07-11 | 2024-01-18 | Ｊｆｅスチール株式会社 | Iron-based powder for oxygen reaction agent, and oxygen reaction agent |
-
1997
- 1997-07-30 JP JP20476697A patent/JPH1147585A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014030784A (en) * | 2012-08-02 | 2014-02-20 | Mitsubishi Gas Chemical Co Inc | Method for manufacturing oxygen absorbent |
| WO2017082183A1 (en) * | 2015-11-09 | 2017-05-18 | Ｄｏｗａエレクトロニクス株式会社 | Iron filings, heat source using same, and warming implement |
| JP2017089005A (en) * | 2015-11-09 | 2017-05-25 | Ｄｏｗａエレクトロニクス株式会社 | Iron powder, heat generator and heating tool using the same |
| JPWO2017082183A1 (en) * | 2015-11-09 | 2017-11-16 | Ｄｏｗａエレクトロニクス株式会社 | Iron powder and heating element and heating tool using the same |
| WO2024014023A1 (en) * | 2022-07-11 | 2024-01-18 | Ｊｆｅスチール株式会社 | Iron-based powder for oxygen reactant, and oxygen reactant |
| WO2024014022A1 (en) * | 2022-07-11 | 2024-01-18 | Ｊｆｅスチール株式会社 | Iron-based powder for oxygen reaction agent, and oxygen reaction agent |
| WO2024014177A1 (en) * | 2022-07-11 | 2024-01-18 | Ｊｆｅスチール株式会社 | Iron-based powder for oxygen reactant and oxygen reactant |
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