WO2018138964A1

WO2018138964A1 - Deodorizing sheet and deodorizing method

Info

Publication number: WO2018138964A1
Application number: PCT/JP2017/034478
Authority: WO
Inventors: 清水　智光; 直幸成定; 由紀子田端
Original assignee: エステー株式会社
Priority date: 2017-01-30
Filing date: 2017-09-25
Publication date: 2018-08-02
Also published as: JP7094897B2; JPWO2018138964A1; KR20190109736A

Abstract

The present invention addresses the problem of providing a deodorizing sheet which carries a larger amount of carbon adsorbents then before so as to have a color mirroring the black color of the carbon adsorbents and exhibit excellent deodorizing properties. A deodorizing sheet addressing this problem is characterized in that the sheet contains pulp fibers and carbon adsorbents, the pulp fibers include 30 mass% or more of pulp fibers having a fiber diameter of 10 to 30 μm relative to the total mass of the pulp fibers, and the average particle size of the carbon adsorbents is 5 to 500 μm.

Description

Deodorizing sheet and deodorizing method

The present invention relates to a deodorizing sheet and a deodorizing method using the same, and more particularly to a deodorizing sheet exhibiting an excellent deodorizing effect against bad odors and a deodorizing method for removing bad odors using the same. .

Conventionally, as a deodorant-containing sheet that can be used for various deodorizing applications, a sheet in which a carbon-based adsorbent such as a carbon-based adsorbent is supported on a fiber sheet made of pulp or the like is known.

For example, Patent Document 1 discloses a deodorant-containing sheet containing at least one deodorant selected from charcoal adsorbents and the like and a β-glucuronidase inhibitor as a disposable disposable article. In diapers, it is described that it is used as a core wrap sheet for covering an absorbent core.

In addition, Patent Document 2 describes a bad odor such as excrement odor, in which a composition composed of a carboxylic acid compound, a metal, and a carbon-based adsorbent that is a porous substance is added to a fiber product mainly composed of synthetic fibers. Deodorant fiber products that can exhibit an excellent deodorant effect are described.

However, in the techniques described in Patent Document 1 and Patent Document 2, a sufficient amount of the carbon-based adsorbent cannot be supported in the fiber sheet, and the deodorizing effect is insufficient. And in order to carry a lot of charcoal adsorbents, it has also been proposed to use a laminated sheet in which a deodorant-containing sheet containing charcoal adsorbents is interposed between fiber sheets. May increase the manufacturing cost.

In recent years, various products using the deodorizing function of charcoal adsorbents have become widespread, and the charcoal adsorbent is a black substance or the charcoal adsorbent has a deodorizing function. Is widely known to consumers. For this reason, the deodorant sheet that deodorizes the charcoal adsorbent has a black to gray color reflecting the color of the charcoal adsorbent instead of white like ordinary paper. The deodorizing effect of the adsorbent can be appealed to consumers, and a sense of security with respect to the deodorizing effect can be given. Therefore, by carrying a large amount of charcoal adsorbent to the extent that it is colored black or gray, in addition to the actual deodorizing effect, it has a color that makes the consumer expect an excellent deodorizing effect. It is desirable that

JP 2010-194254 A JP 2004-52208 A

Accordingly, an object of the present invention is to provide a deodorant sheet having a color reflecting the black color of the carbon-based adsorbent and having excellent deodorizing properties by supporting more carbon-based adsorbent in the fiber sheet. That is.

In the deodorizing sheet containing a charcoal adsorbent, the present inventors have conducted intensive research to increase the amount of the charcoal adsorbent supported. As a pulp fiber, a pulp fiber having a specific fiber diameter is specified. It is found that the carbon-based adsorbent can be supported at a higher content than the conventional deodorant sheet by using the amount and using a carbon-based adsorbent having a specific average particle size as the carbon-based adsorbent. Was completed.

That is, the present invention is a deodorizing sheet containing pulp fibers and a charcoal-based adsorbent, wherein the pulp fibers contain 30% by mass or more of pulp fibers having a fiber diameter of 10 μm to 30 μm with respect to the total mass of the pulp fibers. The deodorizing sheet is characterized in that the carbon-based adsorbent has an average particle size of 5 to 500 μm.

Further, the present invention is a method for deodorizing garbage or excrement that wraps garbage or excrement with the above deodorizing sheet.

Furthermore, the present invention is a deodorizing method for shoes in which the deodorizing sheet is put into shoes.

The deodorizing sheet of the present invention has a relatively large amount of charcoal adsorbent and hardly falls off, has a color reflecting the black color of the charcoal adsorbent, and has excellent deodorizing properties. is there. Further, according to the method for deodorizing garbage or excrement of the present invention, these malodors can be deodorized by an extremely easy method of simply wrapping the garbage or excrement with a deodorizing sheet. Furthermore, according to the deodorizing method for shoes of the present invention, it is possible to deodorize bad odors remaining in the shoes only by placing the deodorizing sheet in the shoes.

Hereinafter, the deodorizing sheet of the present invention will be described in detail. The deodorant sheet of the present invention (hereinafter referred to as “the present invention sheet”) is composed of pulp fibers and a charcoal adsorbent, and uses a specific amount of pulp fibers having a specific fiber diameter as the pulp fibers. A charcoal adsorbent having a specific average particle diameter is used as the charcoal adsorbent.

The sheet of the present invention uses pulp fibers having a fiber diameter of 10 to 30 μm as pulp fibers, and these can be used alone or in combination with pulp fibers having other fiber diameters. Further, the fiber diameter of the pulp fiber combined with the pulp fiber having a fiber diameter of 10 to 30 μm is not particularly limited, but, for example, a fiber diameter exceeding 30 μm is preferable, 31 to 50 μm is more preferable, and 35 to 45 μm is still more preferable. By using a combination of pulp fibers having a fiber diameter of 10 to 30 μm and pulp fibers having a fiber diameter exceeding 30 μm, the deodorizing effect can be exerted quickly, and the strength of the sheet is increased, so that the sheet is wound into a roll. When taking, it becomes difficult to cut. In addition, the said fiber diameter is the value which measured the pulp fiber disaggregated in water with the microscope with image measurement software.

The pulp fiber having a fiber diameter of 10 to 30 μm in the sheet of the present invention is not particularly limited, and examples thereof include known pulp fibers such as hardwood bleached kraft pulp (LBKP), waste paper (recycled) pulp, and pulp having a hydrophilic surface. It is possible to use a fiber that has been processed by the above method and has the above-mentioned fiber diameter or an average fiber length described later. The content of the pulp fiber having a fiber diameter of 10 to 30 μm is 30% by mass (hereinafter simply referred to as “%”) or more, preferably 30 to 30% by mass with respect to the total mass of the pulp fiber in the sheet of the present invention. 100%, more preferably 40 to 90%, still more preferably 50 to 80%, particularly preferably 60 to 70%.

Although it does not restrict | limit especially as a pulp fiber in which the said fiber diameter exceeds 30 micrometers, For example, wood pulp, such as conifer bleach sulfite pulp (NBSP) and a thermomechanical pulp (TMP); Further, pulp fibers such as non-wood pulp such as bamboo, kenaf, hemp, and cotton are treated by a known method so as to have the above-mentioned fiber diameter and an average fiber length described later. The content of the pulp fiber having a fiber diameter exceeding 30 μm is 0 to 70%, preferably 10 to 60%, more preferably 20 to 50%, further based on the total mass of the pulp fiber in the sheet of the present invention. Preferably, it is 30 to 40%.

In the pulp fiber of the sheet of the present invention, the blending amount of the pulp fiber having a fiber diameter of 10 to 30 μm and the pulp fiber having a fiber diameter exceeding 30 μm is not particularly limited. It is particularly preferable to blend 60 to 70% of pulp fibers having a diameter of ˜30 μm with respect to the total mass of pulp fibers and 30 to 40% of pulp fibers having a fiber diameter exceeding 30 μm with respect to the total mass of pulp fibers.

The length of the pulp fiber used in the sheet of the present invention is not particularly limited. For example, the average fiber length is preferably in the range of 0.1 to 3.0 mm, more preferably 0.5 to 2.0 mm. The average fiber length is a value obtained by disaggregating pulp fibers in water, measuring the fiber lengths of 100 or more pulp fibers with a microscope with image measurement software, and averaging them.

In addition, the content of the pulp fiber with respect to the total mass of the sheet of the present invention is, for example, preferably 85 to 98.5%, more preferably 90 to 95%.

The sheet of the present invention uses a charcoal adsorbent having an average particle size of 5 to 500 μm. From the viewpoint of suppressing the dropping of the charcoal adsorbent and improving the deodorizing effect, the average particle diameter of the charcoal adsorbent is preferably 10 μm to 250 μm, more preferably 15 μm to 150 μm, and even more preferably 15 μm to 75 μm. By using a charcoal adsorbent having an average particle size of 5 to 500 μm, a large amount of the charcoal adsorbent is supported in the sheet formed from the pulp fibers, and dropping off is effectively suppressed. Along with this, the deodorizing effect is improved, and the charcoal-based adsorbent is uniformly dispersed in the deodorizing sheet according to the present invention, resulting in a black to gray appearance. The average particle size of the charcoal-based adsorbent is a value of a mass average particle size measured according to JIS K1474.

On the other hand, if the average particle size of the charcoal adsorbent is less than 5 μm, the charcoal adsorbent is too small and it is difficult to suppress the dropout, and the yield of the charcoal adsorbent in papermaking may be reduced. In addition, when the average particle size of the carbon-based adsorbent exceeds 500 μm, the ratio of the carbon-based adsorbent that enters the space between the pulp fibers functioning as the carbon-based adsorbent holding portion tends to decrease, There is a risk that it will fall off the paper easily due to friction and impact, and the effect of suppressing the dropping of the charcoal adsorbent may be reduced. Moreover, since the adsorption | suction performance of a odorous substance will fall when the average particle diameter of a carbonaceous adsorbent exceeds 500 micrometers, the deodorizing effect of a deodorizing sheet tends to fall.

In addition, the amount of carbon-based adsorbent added in the paper (slurry) preparation step is 1.5 to 15%, preferably 5 to 10%, based on the total amount of pulp fiber and carbon-based adsorbent. If it is less than 1.5%, the deodorizing effect is insufficient, and since the black color of the charcoal adsorbent is not reflected, the appealing effect of the consumer's deodorizing effect is insufficient. On the other hand, if it exceeds 15%, the wastewater treatment in the papermaking process is burdened, which is not preferable.

As the charcoal adsorbent used in the sheet of the present invention, a conventionally known adsorbent can be used as long as it is a porous substance having a pore structure, a large specific surface area, and a high adsorbability. Examples of the adsorptive substance include activated carbon, Bincho charcoal, and bamboo charcoal. Among these, it is preferable to use activated carbon or Bincho charcoal because it has an excellent deodorizing effect and can appeal the type of charcoal adsorbent blended to consumers.

Activated charcoal, Bincho charcoal, bamboo charcoal, etc. are usually used as raw materials, such as coconut shells, wood, basamushi, bamboo, etc., and charcoal, coal, etc. good. In addition, the activation method includes a gas activation method in which treatment is performed at a high temperature with water vapor or carbon dioxide, or a chemical activation method in which treatment is performed with zinc chloride, phosphoric acid, concentrated sulfuric acid treatment, or the like. It may be obtained by the method described above.

The activated carbon is divided into fibrous activated carbon and particulate activated carbon according to the shape, and examples of the particulate activated carbon include pulverized charcoal, granulated charcoal, granular charcoal, spherical charcoal, and other powdered activated carbon fine particles. Any shape may be used.

Since the present invention sheet adds a predetermined amount of charcoal adsorbent in the stock preparation process as described above, the entire sheet is a color reflecting the black color of the charcoal adsorbent, more specifically, from black. It has a gray or similar color. As described above, the deodorizing sheet that has the deodorizing effect of the charcoal adsorbent is not white like normal paper, but has a color reflecting the black color of the charcoal adsorbent. It can appeal to the user that it has a deodorizing function by the system adsorbent, and can also give the user a feeling of deodorizing effect.

In addition, it is preferable to add a spreading agent to the sheet of the present invention in order to improve the fixation of the charcoal adsorbent to the pulp fiber and improve the wet paper strength of the sheet. Examples of the spreading agent include cationic polyamidoamines such as epoxidized polyamide polyamine resin (PAE), acrylic cationic polymers such as polyacrylamide, and the like, and these can be used alone or in combination. Among these spreading agents, PAE is particularly preferable.

The amount of the spreading agent added in the stock process is preferably 0.1 to 3%, more preferably 0.5 to 2%, based on the total mass of the pulp fiber used in the sheet of the present invention. If the amount of the spreading agent added is too small, the fixing effect of the carbon-based adsorbent on the pulp fiber may not be obtained. If the content is too large, the deodorizing effect may be reduced.

The sheet of the present invention contains pulp fiber, charcoal adsorbent, and, if necessary, a spreading agent, but may contain other components other than these. Other components include, for example, fibers other than pulp fibers (polyester fibers, rayon fibers, synthetic fibers such as acrylic fibers), wet paper strength enhancers, dry paper strength enhancers, flocculants, fixing agents, ground Examples include filler, release agent, talc and other fillers, dyes, color pigments, antibacterial agents, pH adjusters, water resistance agents, antifoaming agents, etc., one of these alone or in combination of two or more. Can be used.

In the sheet of the present invention, other adsorbents other than the charcoal adsorbent can be used. As other adsorbents, silica gel, zeolite, zinc aluminosilicate, sintered porous viscous mineral, and the like can be used.

Further, in the sheet of the present invention, conventionally used additives such as a retention agent, a filtering agent, a sticking agent, a sizing agent, and a bulking agent can be blended.

The sheet of the present invention can be produced by a known wet papermaking method. The wet papermaking method consists of a stock preparation process for preparing a stock (slurry) consisting of an aqueous dispersion containing pulp fibers, charcoal-based adsorbent, etc., and transporting pulp fibers made from the stock into a fiber web. And a paper making process for drying. As described above, in the paper material preparation step, the carbon-based adsorbent is added in an amount of 1.5 to 15%, more preferably 5 to 10%, based on the total amount of pulp fiber and carbon-based adsorbent. When a spreading agent is used, it is added in an amount of 0.1 to 3% by mass, preferably 0.5 to 2%, based on the total mass of the pulp fiber. In the stock preparation process, for example, first, an intermediate slurry in which pulp fibers and a charcoal adsorbent are dispersed in water is prepared, and then a spreading agent is added to the intermediate slurry as a slurry, which is then used for the papermaking process. be able to. When the spreading agent is added to the intermediate slurry, it is added in an amount of 0.1 to 3% by mass, preferably 0.5 to 2%, based on the dry mass of all pulp fibers contained in the intermediate slurry. The paper making process is usually divided into a wire part, a press part, a dryer part, a size press, a calendar part, etc., and is carried out sequentially. The wet papermaking method can be carried out according to a conventional method using, for example, a paper machine such as a long paper machine, a twin wire paper machine, an on-top paper machine, a hybrid paper machine, or a round paper machine.

Examples of the form of the sheet of the present invention include, for example, a form composed of only one single-layer sheet, a form composed of two or more multi-layer sheets, and the like. It is a sheet. The basis weight of the single-layer sheet in the present invention can be set as appropriate, but if the basis weight is too high, the flexibility and liquid permeability of the sheet may be impaired, and if the basis weight is too low, the carbonaceous adsorption. Since the yield of the agent may be extremely reduced, it is preferably 10 to 60 g / m ² , more preferably 15 to 40 g / m ² , and still more preferably 25 to 35 g / m ² . When the basis weight is less than 10 g / m ² , it may be difficult to wind up in a roll shape. When the basis weight exceeds 60 g / m ² , the deodorizing sheet becomes hard and the object is rubbed against the object during use. There may be problems.

The sheet of the present invention thus obtained has a color reflecting the black color of the charcoal adsorbent and has excellent deodorizing properties.

Since the sheet of the present invention is flexible and can be easily cut and deformed, it can be used in various ways. For example, it can be placed as it is in a place where it is desired to deodorize, or it can be rolled up. More specifically, there is exemplified a method in which a deodorizing sheet processed into a toilet paper type is cut out from several tens of centimeters to several meters, and the opening of the trash box is covered or laid in the trash box. Also, wrap wet garbage, use it over a triangular corner, wrap human or pet excrement, roll it up and place it in shoes such as boots or athletic shoes. Can do.

Since the sheet of the present invention is excellent not only in deodorizing effect but also in water absorption, when it is used by wrapping garbage and excrement, it will deodorize the bad odor caused by garbage and manure, and also garbage and manure It is possible to prevent liquid oozing out by absorbing the liquid generated from the liquid.

Also, when the sheet of the present invention is rolled up and used in shoes such as boots, the inside of the shoes is deodorized, and the paper absorbs moisture in the shoes, so that a dehumidifying effect can be expected.

In addition, the sheet of the present invention can also be used as a sheet for covering a liquid-retaining absorbent member of absorbent articles such as disposable diapers and sanitary napkins.

Hereinafter, the present invention will be described more specifically with reference to examples and the like, but the present invention is not limited to such examples and the like. Unless otherwise specified, “%” means “mass%”.

Example 1
Production of deodorant sheet:
According to the formulation shown in Table 1 below, the pulp fiber and the charcoal adsorbent were uniformly dispersed in water to obtain an intermediate slurry. The numerical values of the charcoal adsorbent and the pulp fiber in the table mean the content with respect to the total amount of the charcoal adsorbent and the pulp fiber. While diluting this intermediate slurry, 0.5% of the epoxidized polyamide polyamine resin (PAE) is added to the dry mass of all pulp fibers in the intermediate slurry and sufficiently stirred so that each component is uniform. To obtain a slurry. This slurry was dehydrated on a wire mesh paper making wire having a mesh size of 100 mesh using a standard sheet machine (round with a sheet size diameter of 160 mm, manufactured by Kumagai Riki Kogyo Co., Ltd.) to form a paper layer. This paper layer was dried with a dryer to obtain a single-layer deodorant sheet.

* 1: Hardwood bleached kraft pulp (LBKP): Average fiber length 0.1-3.0mm
* 2: Softwood bleached sulfite pulp (NBSP): Average fiber length 0.1 to 3.0 mm

Test example 1
The deodorant sheets of the inventive products 1 to 9 and the comparative products 1 to 5 were evaluated in the following points.
(Deodorization test)
Test method
Each deodorizing sheet was cut into a length of 10 cm × 60 cm and used as a sample. This sample and the battery-powered fan were placed in a 10 L tedlar bag and sealed, and 10 L of air was introduced. To this, methyl mercaptan was injected at 30 ppm as a typical malodor of raw garbage, the concentration of methyl mercaptan after 4 hours was measured with a detector tube, and the deodorization rate was measured by the following formula. The results are shown in Table 2.

(Color of deodorant sheet)
The panel was visually checked by 10 panelists according to the following criteria, the average value was determined, and the average score was evaluated as follows. The results are shown in Table 2.
<Standard>
Black ... 3
Gray ... 2
White ... 1
<Evaluation>
Average value 2.0 or more and 3.0 or less ... ○
Average value 1.0 or more and less than 2.0 ・・・ ×

From the above results, it was confirmed that the product of the present invention has a high deodorizing effect on methyl mercaptan. Further, the product 2 of the present invention containing about 66% of pulp fibers having a fiber diameter of 10 to 30 μm and about 33% of pulp fibers having a fiber diameter exceeding 30 μm in the pulp fiber is deodorant. The effect was extremely excellent. Furthermore, the product 2 of the present invention using activated carbon having an average particle size of 20 μm had a higher deodorizing effect than the product 9 of the present invention using activated carbon having an average particle size of 150 μm. In addition, the product of the present invention has a color reflecting the black color of the carbon-based adsorbent, and the consumer can recognize the deodorizing effect.

Test example 2
For the inventive products 1 to 9, a deodorization test was conducted in the same manner as in Test Example 1 so that isovaleric acid was 20 ppm as a typical malodor of shoes such as boots, and the deodorization rate after one hour was measured. . The results are shown in Table 3.

From the above results, it was confirmed that the product of the present invention has a high deodorizing effect on isovaleric acid.

Test example 3
(Hygroscopic test)
The sheet of the product 2 of the present invention obtained in Example 1 was cut into a length of 10 cm × 60 cm (height 1.6 g), and a constant humidity bath of 25 ° C. relative humidity 80% and 40 ° C. relative humidity 90%. The sheet was rolled up, put in 7 hours, 1 day, 4 days, and 5 days, and the weight of the sheet was measured.

Under the condition of 25% relative humidity 80%, the moisture absorbed about 4% of its own weight after 7 hours and about 8% of its own weight after 1 day. Further, under the condition of 40 ° C. and relative humidity of 90%, moisture of about 8% of its own weight was absorbed after 7 hours.

Example 2
Deodorized sheet containing activated carbon and Bincho charcoal (toilet paper type):
30% pulp fiber with a fiber diameter of 10-30 μm, 60% pulp fiber with a fiber diameter exceeding 30 μm, and activated carbon (average particle size) 20%) 5% and Bincho charcoal (average particle size 50 μm) 5% were uniformly dispersed in water to obtain an intermediate slurry. While diluting this intermediate slurry, 0.5% of the epoxidized polyamide polyamine resin (PAE) is added to the dry mass of all pulp fibers in the intermediate slurry and sufficiently stirred so that each component is uniform. To obtain a slurry. This slurry was dehydrated on a wire mesh paper making wire having a mesh size of 100 mesh using a standard sheet machine (round with a sheet size diameter of 160 mm, manufactured by Kumagai Riki Kogyo Co., Ltd.) to form a paper layer. This paper layer was dried with a dryer to obtain a single-layer deodorant sheet. The obtained single-layer deodorizing sheet was wound up to obtain a toilet paper type deodorizing sheet.

The deodorizing sheet of the present invention is less likely to drop off the charcoal adsorbent and can be stably supported in a relatively large amount, so it has a color reflecting the black color of the charcoal adsorbent and has excellent deodorizing properties. Is. Also, because it is flexible and easy to cut and deform, it can be deodorized by wrapping garbage and excrement, or it can be rolled up and stored in the shoe to eliminate the odor remaining in the shoe. It is useful as a deodorant sheet that can be used for various purposes.

Claims

A deodorizing sheet containing pulp fibers and a charcoal adsorbent, wherein the pulp fibers contain 30 mass% or more of pulp fibers having a fiber diameter of 10 μm to 30 μm with respect to the total mass of the pulp fibers, An odor eliminating sheet having an average particle diameter of 5 to 500 μm.
The deodorant sheet according to claim 1, further comprising a spreading agent.
The deodorizing sheet according to claim 1 or 2, wherein the spreading agent is at least one selected from the group consisting of a cationic polyamidoamine and an acrylic cationic polymer.
The deodorant sheet according to any one of claims 1 to 3, wherein the charcoal adsorbent is one or more selected from the group consisting of activated carbon, Bincho charcoal and bamboo charcoal.
The deodorizing sheet according to any one of claims 1 to 4, wherein the basis weight is 10 to 60 g / m 2 .
A method for deodorizing garbage or excrement, characterized in that the deodorant sheet according to any one of claims 1 to 5 wraps the garbage or excrement.
A method for deodorizing shoes, comprising putting the deodorizing sheet according to any one of claims 1 to 5 into shoes.
A method for producing a deodorant sheet comprising pulp fibers and a charcoal adsorbent, comprising pulp fibers having a fiber diameter of 10 to 30 μm in an amount of 30% by mass or more based on the total mass of the pulp fibers, and an average particle diameter A method for producing a deodorant sheet comprising a step of preparing a paper stock comprising an aqueous dispersion containing a charcoal adsorbent having a particle size of 5 to 500 μm.
The method for producing a deodorant sheet according to claim 8, wherein, in the preparation of the paper material, the carbon-based adsorbent is added in an amount of 1.5 to 15% by mass with respect to the total amount of the pulp fiber and the carbon-based adsorbent.
The method for producing a deodorant sheet according to claim 8 or 9, wherein a spreading agent is further added in the preparation of the paper material.
The method for producing a deodorant sheet according to claim 10, wherein the spreading agent is added in an amount of 0.1 to 3% by mass relative to the total mass of the pulp fiber.