JPS58128145A - oxygen absorber - Google Patents

Abstract

PURPOSE:To prevent the generation of dust during packaging in the stage of producing an oxygen absorbing agent by packaging a compsn. consisting of iron powder and an electrolyte such as metal halide or the like and active carbon together in the stage of packaging without mixing the same beforehand. CONSTITUTION:0.1-10 Parts an electrolyte of halides of alkali metals and alkaline earth metals is added as it is or in the form of an aq. soln. to 100parts iron powder of <=50 meshes such as reduced iron powder, electrolytic iron powder, sprayed iron powder, and further powder of <=200 meshes such as active alumina, active caly, diatomaceous earth, pearlite, zeolyte or the like as a filler is added at >=0.5 part the weight of the water under mixing and is dried to powder. Active carbon of <=100 meshes is prepared at 0.1-10 parts with respect to 100 parts the iron powder. The powder and the active carbon are separated in two stages and are packed in an air permeable packaging material. The oxygen absorbing material which does not produce dust during packing is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an oxygen absorbent. More specifically, the oxygen is characterized in that the composition (2) containing iron powder and an electrolyte and activated carbon (1) are not mixed in advance, but K (A) and - are packaged together at the time of packaging. This is an invention that uses a collection agent Kr1j.

In recent years, methods of keeping food fresh using oxygen absorbers have been rapidly gaining popularity.

Various oxygen scavengers are known.

Among these, oxygen scavengers based on iron powder have a high oxygen absorption capacity and oxygen absorption rate (and are also excellent in safety), so they are the most practical and are used in large quantities.

Oxygen absorbers based on iron powder usually contain K in addition to iron powder.

Electrolytes and fillers including halides.

In some cases, it is made by heating water, etc.

Since the iron in this pigeon house emits a peculiar odor, it is usually mixed with a deodorizing absorbent such as activated carbon. However, when mixing to contain activated carbon, which is an iron-based deoxidizing agent, if fine powder activated carbon is used, a lot of black dust will be generated during mixing and when the mixture is packed in a paper bag, making the work environment difficult. Not only does it get worse, but it also causes undesirable effects such as adhesion to paper bags that have fallen apart. In order to prevent such effects, activated carbon in the form of coarse particles or granules is used, but in this case it is difficult to mix it uniformly with other compositions, and the activated carbon and other compositions are classified, so it is difficult to mix them. Subsequently, in the backing of the paper bag, it is not always possible to ensure that the activated carbon is evenly distributed in the oxygen scavenger, resulting in a product that cannot completely remove the odor caused by iron flies.

As a result of intensive research into oxygen scavengers that do not have the above-mentioned drawbacks, the present inventors found that among the components contained in oxygen scavengers, other components (2) except activated carbon )
If you fill either (■) or (■) first at the time of packaging without having to pre-deposit (1) and (2) before packaging, there will be no dust generation due to activated carbon.

Furthermore, since classification does not occur, the present invention was completed based on the discovery that a suitable oxygen scavenger can be obtained.

In this invention 114, various types of iron powder can be used, such as reduced iron 11, Denminato iron powder, Fukiwa iron powder, cutting waste, etc., but the surface area ratio should be as large as possible in order to improve contact with oxygen. It is preferable to

For example, it is appropriate to use S powder as particles of 10 mesh or less, particularly 50 mesh or less.

In the present invention, for example, a metal halide is used as the electrolyte, and the metal components in the metal halide include alkali metals, alkaline earth metals, steel, zinc, aluminum, tin, and manganese.

At least one metal selected from the group consisting of iron, cobalt, and nickel is mentioned, but in consideration of hydrogen generation, alkali metals and alkaline earth metals are preferable, and lithium, sodium, potassium, madanesium, calcium, and barium are preferable. Further, examples of the halogen component in the metal halide include chlorine, bromine, and chlorine. These may be used alone or in combination of two or more.

Methods for mixing metal halides with iron include simple addition and mixing, and methods such as mixing metal halide water** and iron, then drying, and coating metal halides on iron. . If the metal halide is simply mixed, it is appropriate that the amount of metal hagnide α is 1 part or more, preferably 10 g or more, per 100 parts of iron. It is undesirable to use too much metal halide because it reduces the amount of oxygen absorbed per unit weight. Mix the aqueous metal halide casing with iron, then dry in air, etc., and coat the iron with bardanized metal. In this case, the amount used is per 1Oe part of iron, metal halide α00
1 to 10 @, preferably Q, 01 to 3 parts. In either addition method, below the lower limit, the oxygen absorption capacity decreases.

Oxygen absorption by the oxygen absorbent of the present invention utilizes the water fluoride formation reaction of iron. Therefore, the oxygen absorbent contains water or water vapor is present in the system in which the oxygen scavenger is used. It is essential to exist. When the oxygen absorbent contains water, this water may be in any form such as free water or crystal water. When water is used as free water, iron 1
111 parts or more, preferably 5 parts or more per 00 parts.

Also, instead of free water K, Na180.・IOH, O, Na
, 80. When using a compound having water of crystallization such as 7H, 0° Na, CO, .)OH, 0, it is appropriate to use 2 parts or more per 100 m of iron, preferably 10i1 or more. The amount of compounds with free water or water of crystallization is
It is determined as appropriate by taking into account the amount of oxygen collected per unit weight of the oxygen 1lIIL agent. Here, if a food contains water and generates water vapor in a closed system, the application of two components, iron powder and metal halide salt, will sufficiently serve as an oxygen absorber.

In addition, in the present invention, the composition (AK usually contains a filler, but the filler material in this case includes activated alumina, activated clay, diatomaceous earth, perlite, cellulose, zeolite, fine powder silica gel, alkaline earth metal sulfate). , kaolin, silicon nitride, broidal silica, talc, bentonite, silica alumina gel, anhydrous silica,
Examples include organic or inorganic water-insoluble fillers such as calcium silicate, magnesium hydroxide, magnesium oxide, aluminum hydroxide, rum, and iron oxide.The particle size of these fillers is usually 200 mesh or less in order to homogenize the mixture. things are used.

Further, when water is used in compound a, the amount of filler added is preferably 0.2 parts or more per 1 part of water.

More preferably, it is α5 parts or more, and when a crystal water-containing compound is used, it is
Preferably 1 part or more, more preferably 3 parts or more,
It is appropriately determined by taking into consideration the amount of oxygen absorbed per unit weight of the oxygen absorbent.

Granular charcoal is used as m*charcoal, but crushed charcoal granulated vertically may be used (150 mesh or more, preferably L< is lOO
Particles with a particle size of mesh or larger are preferably used.

The amount of activated carbon used is 0.1 part to lO per 100 parts of iron powder.
1 part, more preferably 0.3 parts to 5 parts.

[Back example]

At 100 hrs of iron powder, 20-saline solution 5- and 200 mesh or less of talc 5- were combined in the atmosphere and dried to obtain a powder (2) that was qualitatively free of water.

■ Weighed 30.02F of 4F and 50Metsushie granular activated carbon, and filled them in two layers into a paper bag laminated with a 5F x 5cm perforated polyethylene film using a two-type heating automatic filling machine. The two-stage filling referred to here means that one breathable packaging material K (2
) or 0 and primary ka1 or ^ and packaged together) to obtain an oxygen absorber. No condensation was observed during filling, and packaging was possible.

The obtained de-Il agent was placed in a closed system with 50 G of air.

RH10691! When left at 5°C, the oxygen concentration in the system became αO after 2 days, and no odor was observed in the system.

In addition, when the activated carbon content in the 10 oxygen absorbers obtained by filling and packaging the above was analyzed, it was found to be 0.018f to 0.023
It was within the range of t.

patent applicant Mitsubishi Gas Chemical Co., Ltd. Representative Kazuyoshi Nagano

Claims (1)

[Claims] Without pre-mixing the composition (2) containing iron powder and electrolyte with the activated carbon ■, K(A) and - are mixed at the time of packaging.
An oxygen absorber characterized by being packaged in Oogi packaging.