JPH0133495B2 - - Google Patents

Description

[Detailed description of the invention]

<Industrial Application Field> The present invention provides a composition containing L-ascorbic acid and an iron () compound, by mixing the composition with a vegetable gum substance, thereby adjusting the viscosity adjustment range of the aqueous composition. You can expect an increase in adhesive strength during expansion and coating at the same time.
The present invention relates to an aqueous coating or impregnating composition that can effectively impart deodorizing properties, and processed products thereof. <Prior art> Since a composition consisting of L-ascorbic acid and an iron () compound has bactericidal and deodorizing properties, examples of cases where such properties are effectively utilized include, for example, the use of the former (sterilizing property) by heating. Sterilization of processed foods and salad raw materials that cannot be sterilized,
Alternatively, there is a method for maintaining the freshness of fresh foods and marine products, such as vegetables, fruits, meat, seafood, etc., which tend to lose their freshness, as well as sterilizing them, preservatives, and preservation. Further, as an example of the use of the latter (deodorizing property), there is a use as a deodorant in which the composition is attached to an activated carbon-containing carrier, or the composition itself is incorporated into paper cloth. However, the properties and uses of the above-mentioned composition were first proposed by the present inventor as a result of his research, and were published in a related publication in Japanese Patent Application Laid-Open No.
No. 59604, JP-A-59-143576, JP-A-59-
No. 132937, and Japanese Patent Publication No. 60-66753. <Problems to be Solved by the Invention> However, the composition containing the L-ascorbic acid and iron () compound has problems in its practical use, particularly when coating or impregnating a support with a coating liquid (impregnation liquid: (The same applies hereafter) The viscosity adjustment width, which is an essential requirement for preparation, is narrow, for example, about 4 to 80 cps for BF viscosity,
Furthermore, it has been found that because of almost no water retention, the above compositions are often inconvenient not only in handling during practical use but also in the coating or impregnating process. In other words, this means that the above-mentioned 2.
When coating or impregnating a support with a component-based composition, depending on the properties of the coated surface of the support, the adhesion strength between the composition and the coated or impregnated surface of the support may be insufficient. In this case, the composition tends to fall off. Therefore, in order to eliminate such defects, it is conceivable to mix known polymer adhesives such as latex, polyvinyl alcohol, and starch with the composition; ), it is impossible to achieve the desired purpose by coagulating latex and gelling PVA, starch, etc. However, even if the use of solvent-based polymer adhesives or similar adhesives in addition to the above-mentioned adhesives may be experimentally satisfactory, in industrial practice, the use of this type of solvent-based adhesive is not commonly used. It has the disadvantage that it is unsuitable for coaters for water-based paints. From this perspective, the solution to the above problem has become a particularly urgent issue. <Means for Solving the Problems> As a result of intensive research in order to solve the above problems in the most rational and effective manner, the inventor has found that the conventional L-
An aqueous solution obtained by mixing a vegetable gum substance with a composition containing ascorbic acid and a composition containing an iron () compound has a viscosity necessary for coating or impregnating a support. Through the following experiments, we have completed the present invention by finding out through a number of experiments that we can expect both an expansion of the adjustment width and an increase in adhesive strength during coating or impregnation. That is, the present invention provides a coating comprising a composition containing L-ascorbic acid and at least one type of iron () compound selected from iron () compounds, in which a vegetable gummy substance is mixed with the composition. A first invention relating to an aqueous composition for coating or impregnation;
In a composition containing L-ascorbic acid and at least one type of iron () compound selected from iron () compounds, an aqueous composition in which the composition and a certain amount of a vegetable gum substance are mixed is used as a support. This invention relates to a second invention relating to a processed product which is coated or impregnated. The purpose of the present invention is to provide the aqueous composition with a large viscosity adjustment range (range), high water retention, and good sterilization.
The object of the present invention is to provide a composition suitable for coating or impregnation that has deodorizing properties and excellent adhesive strength, and a processed product to which the composition is applied. As the iron() compound used here, at least one type of iron salts such as ferrous sulfate, ferrous chloride, and ferrous nitrate may be arbitrarily selected and used as an aqueous solution. Therefore, in order to prepare the aqueous composition required in the present invention, any one of the following methods may be used. A mixed solid containing L-ascorbic acid and an iron () compound (powder-containing material; the same applies hereinafter) and a solid vegetable gum material are simultaneously dissolved in water. A solid vegetable gum substance is dissolved in a mixed aqueous solution containing L-ascorbic acid and an iron () compound. A mixed aqueous solution containing L-ascorbic acid and an iron () compound and an aqueous solution of a vegetable gum substance are mixed. A mixture containing L-ascorbic acid and an iron (2) compound (both solids) is dissolved separately or in a mixture in an aqueous solution of a vegetable gum. In the above aqueous composition, the content of the vegetable gum substance is preferably 1 to 2000% by weight (in terms of solid content: the same hereinafter) based on the total amount of L-ascorbic acid and iron () compound used. If the amount used is less than 1% by weight, the resulting aqueous composition will have a narrow viscosity range, making it impossible to adjust the viscosity as desired when preparing the coating solution, and therefore, the support Even if coating or impregnation is possible, not only will a uniform coating film not be obtained, but the composition will fall off after coating or impregnation due to insufficient adhesive strength, making it unsuitable. In addition, if the amount used is at least 2000% by weight, the above disadvantages will be eliminated, but
The high concentration of the coating solution not only makes it impossible to uniformly coat or impregnate the support as desired, but also prevents sterilization due to the insufficient concentration of the two-component composition (mixture containing L-ascorbic acid + iron () compound). , it becomes difficult to impart deodorizing properties, making it impractical. Therefore, in the present invention, the content of the vegetable gum substance in the composition is set to 1% relative to the total amount of L-ascorbic acid and iron () compound used.
~2000% by weight, preferably 5~200% by weight. The liquid concentration of the aqueous composition at this time is 0.3~
50% by weight, preferably 1 to 35% by weight, but the total content of L-ascorbic acid and iron() compound in the liquid is 0.1 to 30% by weight, preferably 1.0 to 35% by weight.
It is important that the amount is 20% by weight, which is the best range for imparting the desired bactericidal and deodorizing properties to the support after coating or impregnation. If this content is less than 0.1% by weight, coating on the support may be possible due to the dilution of the coating solution concentration, but the content of the two components (L-ascorbic acid + iron () compound) may be too low. Therefore, it is not possible to have both the desired sterilizing and deodorizing properties. In addition, if the content exceeds 30% by weight (upper limit), the above-mentioned drawbacks will be resolved, but it will become difficult to dissolve the two-component composition. It is extremely difficult to retain the product, making it unsuitable for treatments such as coating. As described above, the present invention can most effectively achieve the desired object because the components constituting the aqueous composition are mixed in a constant mixing ratio (range) as described above. It is mentioned as a characteristic of As the support for coating the above water-based composition, paper,
Non-woven fabrics, synthetic resin films, and for impregnation, paper, non-woven fabrics, etc. may be optionally used. <Function> As described above, the present invention mixes a certain amount of vegetable gummy material (solid content) with respect to the total usage amount (in terms of solid content) of the composition containing L-ascorbic acid and iron () compound. Iron() compounds form a complex with the malodor source (component) to effectively remove the malodor source and at the same time remove superoxide radical (O ₂ ).
At the same time, the mixture of vegetable gum substances increases the water retention of the composition (aqueous solution) and expands the adjustment range of liquid viscosity. It facilitates coating or impregnation onto a support, and increases the adhesive strength of the coating solution during coating or impregnation. <Effects of the Invention> The present invention exhibits the following unique effects. The present invention provides a composition containing at least one type of iron () compound selected from L-ascorbic acid and iron () compounds, in which the total use of L-ascorbic acid and iron () compounds constituting the composition is provided. Since it is a composition in which a certain amount of vegetable gummy material (solid content) is mixed in with respect to the amount (solid content equivalent), the aqueous solution can expand the adjustment width (range) of liquid viscosity as the water retention increases. It becomes possible,
At the same time, thixotropic properties are imparted, which has the effect of making it easier to handle the liquid and to adjust the coating liquid. In addition, in this invention, as mentioned above, when it comes into contact with a source of malodor, the iron() compound becomes the source of malodor (component).
On the other hand, by mixing L-ascorbic acid, superoxide radical (O ₂ )
Since it generates sterilizing properties and contains a vegetable gummy substance, it is possible to increase the adhesive strength when coating or impregnating a support with a coating liquid. Therefore, the present invention provides high adhesive strength by coating or impregnating a support with the coating liquid.
In addition, it is possible to impart sterilization and deodorization properties to the support at the same time, making it suitable for multi-purpose uses such as sterilization, deodorization (including deodorization), and freshness preservation.The field of application is wide and the practical benefits are remarkable. be. <Example> Example 1 To make the total usage amount of L-ascorbic acid and ferrous sulfate 100g, 10g of the former and 90g of the latter were used.
Weigh out the and into a 1000ml flask and add water to it.
Add and stir 300g of the above L-
A composition (aqueous solution) was prepared in which the total weight of ascorbic acid and ferrous sulfate (in terms of solid content: the same applies hereinafter) was 25% by weight, and the BF viscosity and water retention of the composition were measured at room temperature. It was measured with The results are shown in Table 1. Example 2 In Example 1, after preparing the aqueous solution so that the total weight of L-ascorbic acid and ferrous sulfate was 25% by weight, 5% by weight of locust bean gum (solid content equivalent) was added to 300 g of this aqueous solution. :same as below)
75 g of a concentrated aqueous solution was added and stirred to obtain a desired composition (aqueous solution). The BF viscosity and water retention of this composition were measured at room temperature and the results shown in Table 1 were obtained. Example 3 A desired composition (aqueous solution) was obtained in the same manner as in Example 2, except that the amount of locust bean gum aqueous solution added was 150 g instead of 75 g. The BF viscosity and water retention were measured and the results shown in Table 1 were obtained. Example 4 A desired composition (aqueous solution) was obtained in the same manner as in Example 3, except that the amount of locust bean gum aqueous solution added was 300 g instead of 150 g. The BF viscosity and water retention were measured and the results shown in Table 1 were obtained. Example 5 Composition (aqueous solution) obtained in Example 1
10 g of locust bean gum powder was added to 400 g and stirred to obtain a desired composition (aqueous solution). this
BF viscosity and water retention were measured and the results shown in Table 1 were obtained. Example 6 Composition (aqueous solution) obtained in Example 5
Add 1200g of water equivalent to 3 times the weight to 400g, stir (dilute), and add 50g of locust bean gum powder to the diluted solution.
A desired composition (aqueous solution) was obtained in the same manner as in Example 5, except for adding and stirring. The BF viscosity and water retention were measured and the results shown in Table 1 were obtained. Examples 7 to 22 Compositions obtained in Example 1 (aqueous solution)
Add aqueous solutions of guar gum, locust bean gum, gum arabic, gum tracanth (partially modified products), etc. to 300g (concentration, amount added: see Table 2)
After stirring to obtain the desired composition (aqueous solution), the BF viscosity and water retention of each composition were measured, and the results shown in Table 2 were obtained. Examples 23-26 Compositions obtained in Example 1 (aqueous solution)
Add guar gum powder to 300 g and stir according to the added amount to obtain multiple compositions (aqueous solutions). Then, use this as a coating liquid and apply the rod coating to commercially available paperboard (normal method) according to the composition. Each coating obtained The following deodorization test was conducted on the paper and the results listed in Table 3 were obtained. Deodorization test: - (a) Odor bag for environmental analysis (manufactured by Gascro Kogyo Co., Ltd.,
Air is injected into Capacity 3), an appropriate amount of ammonia vapor is injected into it, and the ammonia concentration is measured through a detection tube (manufactured by Kitazawa Sangyo Co., Ltd.) after uniformly dispersing the air. (b) Cut the specimen into 5 mm x 30 mm pieces to obtain a certain number of specimens (40 pieces). After that, add the sample (b) to the ammonia-containing bag (a).
Pour the entire amount into the bag, put a silicone rubber stopper on it, leave it for 24 hours, and then measure the ammonia concentration inside the bag through a detection tube.

【table】

[Table] As is clear from Table 1 above, the viscosity and water retention properties were determined for compositions (aqueous solutions) in which an aqueous solution of L-ascorbic acid and ferrous sulfate was mixed with an aqueous locust bean gum solution or a non-aqueous solution (powder). It can be seen that both of these are far superior to the case without the addition of locust bean gum.

【table】

[Table] As is clear from the above table (Table 2), compositions (aqueous solution It is known that both the viscosity and water retention properties of the product were far superior to those without the addition of vegetable gum substances.

【table】

[Table] As is clear from the above table (Table 3), compositions (aqueous solutions) containing different amounts of vegetable gummy substances (guar gum) were applied to aqueous solutions containing L-ascorbic acid and ferrous sulfate. The deodorization rate when the coated paper was coated on a support (paper) so that the coating amount was the same as that of the liquid was treated in an odor-containing atmosphere by a prescribed method, compared to when no guar gum was added. is equivalent,
It can be seen that the original sterilizing and deodorizing effects of L-ascorbic acid and iron () compounds are not inhibited in any way.

Claims (1)

[Claims] 1. A composition containing at least one type of iron () compound selected from L-ascorbic acid and iron () compounds, characterized in that the composition is mixed with a vegetable gum substance. An aqueous composition for coating or impregnation. 2. Claim 1, in which the vegetable gum substance is at least one selected from guar gum, locust bean gum, gum arabic, gum tracanth, tamarind gum, and modified products thereof.
The aqueous coating or impregnating composition described in . 3. The amount of vegetable gum used is 1 for the total amount of L-ascorbic acid and at least one type of iron () compound selected from iron () compounds.
The aqueous coating or impregnating composition according to claim 1 or 2, which comprises 2000% by weight. 4. In a composition containing L-ascorbic acid and at least one type of iron () compound selected from iron () compounds, an aqueous composition obtained by mixing a certain amount of a vegetable gum substance with the composition is used as a support. A processed product characterized by being coated or impregnated. 5. Claim 4, wherein the total amount of L-ascorbic acid and iron () compound used in the aqueous composition is 0.1 to 30% by weight based on the aqueous composition.
Processed products described in section.