JP6923839B2 - Acid gas adsorbents and deodorant processed products - Google Patents

Description

The present invention is an acid gas adsorbent made of sodium silicate, preferably an acid gas adsorbent made of crystalline sodium silicate. It has excellent workability and does not deteriorate or color the resin even if it is kneaded into a resin, so it deodorizes paper, fibers, films, plastic molded products, etc. that exhibit excellent deodorizing performance using the adsorbent. Regarding providing sex processed products.

In recent years, there has been increasing interest in odors in daily life, and various deodorant processed products such as indoor and spray type deodorant products, deodorant wallpapers, deodorant curtains and deodorant clothing have been proposed. .. These deodorant products and deodorant processed products use a deodorant composed of an inorganic adsorbent and are coated or kneaded at the time of processing to exhibit deodorant performance.
There are acid gas, basic gas, sulfur gas, etc. in the odor, but since there is selectivity for these target odors depending on the type of adsorbent that composes the deodorant, select an adsorbent suitable for the generated odor. Need to be used.
Acid gases such as acetic acid and isovaleric acid contained in sweat odor, body odor and pet odor are one of the odors that are difficult to deodorize and are generated in applications closely related to daily life. Many adsorbents have been proposed.

Conventionally, as a deodorant for acid gas, a deodorant using various inorganic adsorbents has been proposed.
For example, Patent Document 1 describes an alumina carrier obtained by molding a rehydrateable alumina powder, holding it in a water vapor atmosphere at room temperature to 120 ° C., and then calcining it to obtain 2 to 15% by weight of alkali in terms of oxide. An acidic component adsorbent characterized by the presence of a metal salt is disclosed. Patent Document 2 discloses hydrated zirconium oxide as a deodorant for deodorizing bad odors caused by acid gases such as acetic acid, isovaleric acid and butyric acid. Patent Document 3 discloses hydrated zirconium oxide as a deodorant that deodorizes bad odors caused by acid gases such as acetic acid, isovaleric acid, and butyric acid. In Patent Document 4, a deodorant containing the component (a) aluminum tripolyphosphate, the component (b) zinc oxide, the component (c) smectite, and the component (d) water contains acetic acid and the like. It is disclosed that it has a deodorizing effect on bad odors. Patent Document 5 describes an interior using a cloth to which a plurality of deodorants are applied, and discloses zinc oxide as an effective deodorant for acid gas-based odors.

Japanese Unexamined Patent Publication No. 6-190274 Japanese Unexamined Patent Publication No. 10-155884 JP-A-2002-2002-149 Japanese Unexamined Patent Publication No. 2009-90012 Japanese Unexamined Patent Publication No. 2014-54754

Although the acid gas deodorant proposed above exhibits an acid gas adsorption effect, its adsorption capacity is not sufficient, so that a large number of deodorants are used when processing into substrates such as paper, fibers and plastics. The amount of processing was required. In addition, since many deodorants for acid gas are alkaline, deterioration of the processed resin base material often results in deterioration of physical properties and removal of the adsorbent. In particular, zinc compounds having an excellent acid gas adsorption effect. The more alkaline the deodorant, the stronger the tendency.
Therefore, an object of the present invention is to provide an adsorbent having high adsorption performance for acid gas and less likely to cause resin deterioration when blended with a resin or the like. Another object of the present invention is to provide a deodorant processed product such as paper, non-woven fabric and fiber which exhibits excellent deodorant performance by using the adsorbent.

The present inventor has found an excellent adsorbent that exhibits extremely high deodorizing performance by using an adsorbent for acid gas composed of sodium silicate. In addition, this adsorbent does not easily cause resin deterioration even when mixed with resin, and paper, non-woven fabrics, fibers, plastic molded products, etc. that have been coated or kneaded have high deodorization without appearance problems such as coloring and discoloration. We also found that it exhibits performance.
That is, the present invention is shown below.
1. 1. Ri Do from sodium silicate, acetate gas chemisorption capacity a Der Ru acid gas adsorbent than 20 mL / g, an acid gas containing the acid gas, acetic acid, isovaleric acid, and butyric least one or more Is an acid gas adsorbent .
2. The acid gas adsorbent according to 1 above, wherein sodium silicate is represented by the following formula (1).
Na ₂ O ・ mSiO ₂・ nH ₂ O (1)
In the formula (1), m and n are positive numbers, which satisfy m = 0.8 to 4.4 and n = 0.01 to 8.0.
3 . The adsorbent for acid gas according to 1 or 2 above, wherein the average particle size measured by a laser diffraction particle size distribution meter is 0.1 μm to 20 μm.
4 . The adsorbent for acid gas according to any one of 1 to 3 above, wherein sodium silicate is crystalline.
5 . A deodorant processed product, which comprises applying or kneading the acid gas adsorbent according to any one of 1 to 4 above to a resin.

The acid gas adsorbent in the present invention is excellent in acid gas adsorption performance such as acetic acid and isovaleric acid, and is less likely to cause resin deterioration when blended with a resin or the like. The color of the adsorbent is white, and it can be applied to or kneaded into products such as paper and fibers, and the deodorant properties of paper, non-woven fabrics, fibers, etc. that exhibit excellent deodorizing performance using the adsorbent. Processed products can be provided.

The present invention is an acid gas adsorbent composed of sodium silicate.
Hereinafter, the present invention will be described in detail. Unless otherwise specified,% is mass%, and parts indicate mass parts.

1. 1. Sodium silicate Various compounds can be used as the sodium silicate used in the adsorbent for acid gas of the present invention.
Specific examples of sodium silicate include kanemite (Na ₂ O ・_{4SiO 2}・ 8H ₂ O), sodium disilicate (Na ₂ O ・ Si ₂ O ₄・ nH ₂ O), and macatite (Na ₂ O ・ 8SiO ₂・ 11H). ₂ O), Islayite (NaHSi ₈ O ₁₇ · nH ₂ O), Magadite _{(Na 2 HSi 14} O ₂₉ · nH ₂ O), Kenyaite _{(Na 2 HSi 2} O ₄₁ · nH ₂ O) and the like are preferable. Is sodium disilicate.

As the sodium silicate, crystalline sodium silicate is preferable because it has excellent acid gas adsorption performance.
In the present invention, the crystalline substance means that a clear diffraction peak due to the crystal structure can be obtained in powder X-ray diffraction measurement.

As the sodium silicate used in the present invention, sodium silicate represented by the following formula (1) is preferable.
Na ₂ O ・ mSiO ₂・ nH ₂ O (1)
In the formula (1), it is a number satisfying m = 0.8 to 4.4 and n = 0.01 to 8.0. As the value of m _{increases, the SiO 2} concentration increases, resulting in poor solubility. The preferable range of m is 1.5 to 2.6, and when m is 0.8 or less, the water solubility is high, so that the durability is inferior, and when m is 4.4 or more, the adsorptivity is lowered. If n is less than 0.01, the amount of acid gas adsorbed decreases, and if n is more than 8.0, the water content may hydrolyze during resin processing, resulting in a decrease in processability.
The above m and n are values obtained by calculating the elemental analysis ratio from the measurement results of the fluorescent X-ray analysis.

The method for producing sodium silicate used in the present invention can be achieved by applying conventional techniques, and there are no restrictions on raw materials, production methods, equipment, and the like.
For example, it _{is produced by drying an aqueous sodium silicate solution having a molar ratio of SiO 2} / Na ₂ O of 0.8 to 4.4 and firing the obtained solid at 500 to 850 ° C. for several minutes to several hours. Is possible.
It should be noted that even if a small amount of other components are contained in the adsorbent, there is no problem because the deodorizing performance is not deteriorated, but the deodorizing performance is not significantly improved.

The chemical adsorption capacity of acetic acid gas of sodium silicate in the present invention is preferably 20 mL / g or more. By setting the chemical adsorption capacity to 20 mL / g or more, excellent adsorption performance and a satisfactory deodorizing effect can be obtained.
In the present invention, the adsorption capacity means the maximum amount of a specific gas component that the compound can deodorize, absorb, and adsorb.
In the technical field of adsorbents, the adsorption capacity adsorbed by both physical adsorption and chemical adsorption mechanisms is often shown. In the case of physical adsorption, the odor once adsorbed is re-emitted because the adsorption force is weak, but since chemisorption reacts with the odor and does not cause re-emission, chemical adsorption is preferable as the adsorption mechanism of the adsorbent. A method of distinguishing the chemisorption capacity of a deodorant from the physical adsorption capacity is to raise the adsorption test temperature to a high temperature and measure the adsorption capacity. Since physical adsorption does not occur at high temperatures, it is possible to distinguish and measure only the chemisorption capacity by setting the adsorption test temperature to 40 ° C. or higher, and this measuring method is also adopted as the chemisorption capacity in the present invention.
The specific method for measuring the chemisorption capacity of acetic acid gas is as follows.
A test bag made of vinyl alcohol-based polymer or polyester, which is a material that does not easily adsorb acetic acid gas and does not allow air to pass through, is sealed with a deodorant, and after injecting acetic acid gas into this sealed test bag, 40 Store in a thermostat above ℃. Immediately after injecting acetic acid gas and after storage for a certain period of time, the concentration of acetic acid gas remaining in the test bag is measured. At this time, the point at which the residual gas concentration after a certain period of time becomes 1/10 or more of the initial gas concentration is defined as the point at which the adsorption performance is broken, and the difference between the residual gas concentration at this time and the initial gas concentration is adsorbed. The amount of acetate gas adsorbed and absorbed by the agent.

The sodium silicate in the present invention is a white powder, and the powder color thereof is preferably L value 90 to 99, a value -2 to 5, and b value -2 to 5. As long as the Lab color space display is within the above range, the deodorant can be used for a wide range of purposes.

The particle size of sodium silicate in the present invention is preferably 0.1 μm to 20 μm, more preferably 0.5 μm to 3 μm in average particle size.
When the average particle size is 0.1 μm or more, it is difficult to aggregate and the workability can be improved. When the average particle size is 10 μm or less, thread breakage occurs in processing into fine fibers or thin films. It is possible to prevent defects and defects in the appearance of the molded product. The maximum particle size is 20 μm or less, preferably 5 μm or less.

The above average particle size indicates a value of particle size D50 measured by a laser diffraction particle size distribution meter and analyzed on a volume basis.

2. Acid Gas Adsorbent and Uses The present invention is an acid gas adsorbent composed of the sodium silicate described above.
The acid gas in the present invention is an acid gas that causes a foul odor, and specifically means acetic acid, isovaleric acid, butyric acid, and the like.

The acid gas adsorbent of the present invention can be used for various purposes as a deodorant.
As a deodorant, the sodium silicate powder or granules can be used as a deodorant as they are, or the sodium silicate powder or granules can be used as a deodorant product in a container such as a cartridge, and can be used indoors. The effect can be exhibited by keeping it in the vicinity of the source of bad odor outdoors.

Further, the adsorbent for acid gas of the present invention can be blended with fibers, paints, sheets, molded products and the like as described in detail below, and can be used as a raw material for producing a deodorant processed product.
Applications of deodorant processed products include deodorant fibers, deodorant paints, deodorant sheets, deodorant resin molded products and the like.
When the adsorbent of the present invention is used in the production of these deodorant processed products, the adsorbent can be used in various forms depending on the purpose. For example, it is blended with a resin or the like and mixed. Alternatively, when kneading, it is used as a powder or granule of sodium silicate, and when it is applied to a base material, an aqueous or organic solvent-based suspension containing sodium silicate is used.
Hereinafter, these uses will be described.

2-1. Deodorant Fiber One of the useful uses of the adsorbent of the present invention is deodorant fiber.
In this case, the raw material fiber may be either a natural fiber or a synthetic fiber, or may be a short fiber, a long fiber, a composite fiber having a core-sheath structure, or the like. There is no particular limitation on the method of imparting deodorant performance to the fiber by using the adsorbent of the present invention. For example, when the adsorbent of the present invention is applied to the fiber by post-processing, sodium silicate is contained. An aqueous or organic solvent-based suspension can be attached to the fiber surface by a method such as coating or dipping, and the fiber surface can be coated by removing the solvent. Further, a binder for increasing the adhesive force to the fiber surface may be mixed.
The pH of the aqueous suspension containing sodium silicate is not particularly limited, but the pH is preferably around 6 to 10 in order to fully exhibit the performance of the adsorbent.

Further, by kneading the adsorbent of the present invention into a melted liquid fiber resin or a melted fiber resin solution and spinning the adsorbent, a fiber having deodorant performance can be obtained.
As the fiber resin that can be used in this method, any known chemical fiber can be used. Preferred specific examples thereof include, for example, polyester, polyamide, acrylic, polypropylene, polyethylene, polyvinyl, polyvinylidene, polyurethane and polystyrene. These resins may be single polymers or copolymers. In the case of a copolymer, the polymerization ratio of each copolymer component is not particularly limited.
The adsorbent of the present invention is particularly characterized in that it can be kneaded into polyester fibers. In general, zinc oxide and a composite oxide of aluminum oxide and magnesium oxide having a large adsorption capacity of acid gas are often kneaded into a polyester resin by an alkaline component or the like to lower the resin viscosity and cannot be spun. On the other hand, it is presumed that the adsorbent of the present invention can be processed without deteriorating the polyester due to the presence of an alkaline component that causes resin deterioration inside the crystal structure.

The proportion of the adsorbent for acid gas of the present invention contained in the resin is not particularly limited. Generally, if the content is increased, the deodorant property can be exerted strongly and can be maintained for a long period of time. Therefore, it is preferably 0.1 to 10 parts by mass, and more preferably 0.5 to 5 parts by mass per 100 parts by mass of the resin.
The deodorant fiber using the acid gas adsorbent of the present invention can be used in various fields requiring deodorant properties, such as underwear, stockings, socks, duvets, duvet covers, cushions, blankets, and carpets. , Curtains, sofas, car seats, air filters, nursing clothing, etc., can be used for many textile products.

2-2. Deodorant paint Another use of the acid gas adsorbent of the present invention is a deodorant paint.
There is no particular limitation on the fat or resin that is the main component of the paint vehicle used in producing the deodorant paint, and it may be any of natural vegetable oil, natural resin, semi-synthetic resin and synthetic resin, and heat. It may be either a plastic resin or a thermosetting resin. Examples of fats and oils and resins that can be used include drying oils such as linseed oil, alkyd oil, and soybean oil, or semi-drying oils, rosin, nitrocellulose, ethyl cellulose, cellulose acetate butyrate, benzyl cellulose, novolak-type or resole-type phenols. There are resins, alkyd resins, aminoalkyd resins, acrylic resins, vinyl chlorides, silicone resins, fluororesins, epoxy resins, urethane resins, saturated polyester resins, melamine resins, polyvinylidene chloride resins and the like.

The acid gas adsorbent of the present invention can be used for both liquid paints and powder paints. Further, the deodorant coating composition using the acid gas adsorbent of the present invention may be of a type that is cured by any mechanism, specifically, an oxidation polymerization type, a moisture polymerization type, a heat curing type, a catalyst curing type, and an ultraviolet ray. There are a curing type, a polyol curing type, and the like. The pigments, dispersants and other additives used in the coating composition are not particularly limited except for those that may cause a chemical reaction with fine particle zinc oxide and deodorant substances used in combination therewith. .. The coating composition using the adsorbent for acid gas of the present invention can be easily prepared. Specifically, the adsorbent or deodorant composition and the coating component are generally used in a ball mill, a roll mill, a device, a mixer, or the like. It may be sufficiently dispersed and mixed using a mixing device.

The proportion of the adsorbent for acid gas of the present invention contained in the deodorant coating material is not particularly limited. Generally, if the content is increased, the deodorant property can be exerted strongly and can be maintained for a long period of time. , Cracks may occur, so it is preferably 0.1 to 20 parts by mass, and more preferably 0.5 to 10 parts by mass per 100 parts by mass of the coating composition.
The deodorant paint containing the adsorbent of the present invention can be used in various fields requiring deodorant properties, for example, inner and outer walls of buildings, vehicles, railways, garbage incinerator facilities, and kitchen waste. Can be used in containers, etc.

2-3. Deodorant sheet One of the other uses of the acid gas adsorbent of the present invention is a deodorant sheet.
There are no restrictions on the material, microstructure, etc. of the sheet material used as the raw material. The preferred material is resin, paper or the like, or a composite thereof, and a porous material is preferable. Preferred specific examples of the sheet material include Japanese paper, synthetic paper, non-woven fabric, resin film and the like, and particularly preferable sheet material is paper made of natural pulp and / or synthetic pulp. The use of natural pulp has the advantage that the powder of the adsorbent particles is sandwiched between the finely branched fibers, making it a practical carrier without the use of a binder, while synthetic pulp is chemical resistant. It has the advantage of being excellent in sex. When synthetic pulp is used, it may be difficult to support the adsorbent particles by sandwiching the powder between the fibers. Therefore, a part of the fibers is melted in the drying step after papermaking to form the powder. It is also possible to increase the adhesive force between the fibers and to mix another thermosetting resin fiber with a part of the fibers.
When natural pulp and synthetic pulp are mixed and used in an appropriate ratio in this way, paper having various properties adjusted can be obtained. Generally, when the ratio of synthetic pulp is increased, strength, water resistance, and chemical resistance are obtained. And paper having excellent oil resistance and the like can be obtained, while when the proportion of natural pulp is increased, paper having excellent water absorption, gas permeability, hydrophilicity, molding processability, texture and the like can be obtained.

The method for supporting the adsorbent for acid gas of the present invention on the sheet material is not particularly limited. The adsorbent for acidic gas of the present invention may be supported either during the production of the sheet or after the production of the sheet. There is also a method of applying, dipping or spraying a liquid in which an adsorbent is dispersed on a prefabricated paper.
Hereinafter, as an example, a method for introducing the adsorbent for acid gas of the present invention during the papermaking process will be described. The papermaking process itself may be carried out according to a known method. For example, first, a cationic and anionic flocculant is added to a slurry containing an adsorbent and pulp at a predetermined ratio in an amount of 5% by weight or less based on the total weight of the slurry. To produce aggregates. Next, the agglomerates are made into paper by a known method and dried at a temperature of 100 to 190 ° C. to obtain a paper carrying an acid gas adsorbent.

The amount of the adsorbent for acidic gas carried on the sheet material of the present invention is generally such that the deodorizing property is strongly exhibited and can be maintained for a long period of time by increasing the amount of the adsorbent carried on the sheet material. Since there is no significant difference in the effect, the preferred amount of the adsorbent to be supported is 0.1 to 10 per 100 parts by mass of the sheet when the adsorbent or the deodorant composition is supported on the entire surface and inside of the sheet during the papermaking process. ^{It is a part by mass, and is 0.05 to 15 g / m 2} when the adsorbent is supported only on the surface of the sheet by post-processing by coating or the like.
The deodorant sheet using the adsorbent of the present invention can be used in various fields requiring deodorant properties, for example, medical wrapping paper, food wrapping paper, electrical equipment wrapping paper, nursing paper. There are products, freshness-preserving paper, paper clothing, air cleaning filters, wallpapers, tissue paper, toilet paper, etc.

2-4. Deodorant resin molded product An application of the adsorbent for acid gas of the present invention to a resin molded product can be mentioned.
When the acid gas adsorbent of the present invention is added to the resin, the resin and the adsorbent can be mixed as they are and put into a molding machine for molding, or a pellet-shaped resin containing a high concentration of the acid gas adsorbent can be obtained. It is also possible to prepare in advance, mix this with the main resin, and then mold it. In addition, in order to improve the physical properties of the resin, various pigments, dyes, antioxidants, light-resistant stabilizers, antistatic agents, foaming agents, impact-resistant enhancers, glass fibers, moisture-proofing agents, bulking agents, etc. are used. Other additives can also be added.
As a molding method for producing a deodorant resin molded product using the adsorbent of the present invention, a general resin molding method such as injection molding, extrusion molding, inflation molding, or vacuum forming can be used.
The deodorant resin molded product using the adsorbent or deodorant composition of the present invention can be used in various fields requiring deodorant properties, for example, household goods such as air purifiers and refrigerators, and home appliances. There are general household items such as trash cans and drains, various nursing items such as portable toilets, and daily necessities.

Hereinafter, the present invention will be described in more detail, but the present invention is not limited thereto. In addition,% is mass%. The powder physical characteristics and deodorant performance of the acid gas adsorbent and the comparative adsorbent of the present invention were measured by the following methods.

(1) Powder Crystallinity Powder crystallinity was carried out by Cu Kα rays using an X-ray diffractometer "RINT2400V" (model name) manufactured by Rigaku Co., Ltd., and an X-ray diffraction image was obtained. The measurement conditions were a tube voltage of 40 kV and a current of 150 mA. If a clear diffraction peak was obtained, it was determined to be crystalline, and if it was not obtained, it was determined to be amorphous.

(2) Elemental composition Measurement was performed by fluorescent X-ray analysis using a ZSX100e type fluorescent X-ray analyzer manufactured by Rigaku, and the result was analyzed on the basis of the amount of substance to calculate the elemental composition (mol) ratio.

(3) Particle size D50 and D90
The particle size D50 and D90 of the adsorbent were measured with a laser diffraction type particle size distribution meter, and the results were analyzed on a volume basis. The content% of the particle size distribution is the volume% in all particles from this analysis method, but since the density of the measured powder is constant, it has the same meaning as the mass%. Specifically, it was measured by a laser diffraction type particle size distribution measuring device "MS2000" manufactured by Malvern.

(4) Chemisorption capacity of powder 0.01 g of adsorbent powder is placed in a test bag made of a vinyl alcohol-based polymer film, and 10 L of acetic acid (initial concentration 100 ppm) is injected therein to determine the residual gas concentration in the tedler bag after 30 minutes. Measured with a gas detector tube.

(5) Acetic acid deodorizing performance of deodorant molded product 100 cm ² of deodorized molded product is placed in a test bag made of vinyl alcohol-based polymer film, and 3 L of acetic acid (initial concentration 30 ppm) is injected therein, and the test is performed after 2 hours. The residual gas concentration in the bag was measured with a gas detector tube.

(6) Isovaleric acid deodorant performance of deodorant fiber Put 1 g of deodorant fiber in a test bag made of vinyl alcohol polymer film, inject 500 mL of isovaleric acid (initial concentration 38 ppm) into it, and 2 hours later. The residual gas concentration in the test bag was measured with a gas detector tube.

<Example 1>
An _{aqueous sodium silicate solution having a molar ratio of SiO 2} / Na ₂ O was dried, and the obtained solid was calcined at 650 to 660 ° C. for 3 hours. The obtained white powder was pulverized, and the crystallinity, composition, particle size D50, D90, and acetic acid deodorizing capacity of the obtained crystalline sodium silicate were measured and shown in Table 1.

<Example 2>
The same operations and analyzes as in Example 1 were performed except that the firing conditions were 870 to 880 ° C. for 1 hour, and the results are shown in Table 1.

<Example 3>
The same operations and analyzes as in Example 1 were performed except that the molar ratio of SiO ₂ / Na _{2 O was 1.9, and the results are shown in Table 1.}

<Example 4>
Table 1 shows the results of the same operations and analyzes as in Example 1 except that the molar ratio of SiO ₂ / Na _{2 O was 1.7 and the firing conditions were 720 to 730 ° C. for 1 hour.}

<Example 5>
The same operations and analyzes as in Example 1 were performed except that the molar ratio of SiO ₂ / Na _{2 O was set to 2.8, and the results are shown in Table 1.}

<Example 6>
The same operations and analyzes as in Example 1 were performed except that the molar ratio of SiO ₂ / Na _{2 O was 1.9, and the results are shown in Table 1.}

<Comparative example 1>
Table 1 shows the results of measuring the crystallinity, composition, particle size D50, D90, and chemisorption capacity of acetic acid using commercially available zirconyl hydroxide.

<Comparative example 2>
Table 1 shows the results of measuring the crystallinity, composition, particle size D50, D90, and chemisorption capacity of acetic acid using commercially available amorphous zinc oxide.

<Comparative example 3>
Table 1 shows the results of measuring the crystallinity, composition, particle size D50, D90, and chemisorption capacity of acetic acid using commercially available hydrotalcite.

<Example 7> Polyester resin molded product The adsorbent of Example 1 was mixed with Unitica polyester resin MA201 by 4% by dry blend, and a plate having a thickness of 1 mm was molded by an injection molding machine.
Table 2 shows the results of a deodorization test using acetic acid gas using the obtained molded plate 100 cm ^2.

<Example 8> Polyester resin molded product The adsorbent of Example 2 was mixed with Unitica polyester resin MA201 by 4% by dry blend, and a plate having a thickness of 1 mm was molded by an injection molding machine.
Table 2 shows the results of a deodorization test using acetic acid gas using the obtained molded plate 100 cm ^2.

<Comparative Example 4> Polyester Resin Molded Product The adsorbent of Comparative Example 1 was mixed with Unitica polyester resin MA201 by 4% by dry blend, and a plate having a thickness of 1 mm was molded by an injection molding machine.
Table 2 shows the results of a deodorization test using acetic acid gas using the obtained molded plate 100 cm ^2.

<Comparative Example 5> Polyester Resin Molded Product The adsorbent of Comparative Example 2 was mixed with Unitica polyester resin MA201 by 4% by dry blend, and a plate having a thickness of 1 mm was molded by an injection molding machine. In Comparative Example 2, the workability was very poor, and a clean molded plate could not be obtained due to cracking or foaming.
Table 2 shows the results of a deodorization test using acetic acid gas using a relatively large debris plate so as to have a size of 100 cm ^2.

<Comparative Example 6> Polyester Resin Molded Product The adsorbent of Comparative Example 3 was mixed with Unitica polyester resin MA201 by 4% by dry blend, and a plate having a thickness of 1 mm was molded by an injection molding machine.
In Comparative Example 3, the workability was very poor, and a clean molded plate could not be obtained due to cracking or foaming, so that the deodorizing test could not be performed.

<Example 9> Polyester fiber A masterbatch in which the adsorbent of Example 1 was blended with 20% of Unitika polyester resin MA201 was prepared. The obtained masterbatch was diluted to 1/10 with Unitika polyester resin MA201, and the deodorant polyester yarn was spun by drawing four times with a monofilament spinning machine.
Spinning could be processed without yarn breakage or increase in filtration pressure. Table 3 shows the results of a deodorization test using isovaleric acid using the obtained deodorant fibers.

<Comparative Example 7> Polyester Fiber A masterbatch in which the adsorbent of Comparative Example 1 was blended with 20% of Unitika polyester resin MA201 was prepared. The obtained masterbatch was diluted to 1/10 with Unitika polyester resin MA201, and deodorant polyester yarn was spun with a filament spinning machine.
Spinning could be processed without yarn breakage or increase in filtration pressure. Table 3 shows the results of a deodorization test using isovaleric acid using the obtained deodorant fibers.

<Comparative Example 8> Polyester Fiber An attempt was made to prepare a masterbatch in which the adsorbent of Comparative Example 2 was blended with 20% of Unitika polyester resin MA201, but the viscosity of the resin was significantly reduced and the masterbatch could not be prepared. Therefore, spinning and deodorizing tests could not be carried out.

The adsorbent of the example had a higher acetic acid gas adsorption capacity than the adsorbent of the comparative example, and could be kneaded into a polyester resin. Further, the adsorbent of the example has an excellent deodorizing effect in the deodorizing evaluation of the polyester resin molded product and the spun product.

The adsorbent for acid gas of the present invention has an excellent deodorizing effect on acid gas and is also excellent in processability, and can be used for various purposes as a deodorant. Furthermore, the color of the adsorbent is white, and it can be applied to or kneaded into products such as paper and fibers, and the adsorbent can be used to erase paper, non-woven fabrics, fibers, etc. that exhibit excellent deodorizing performance. Odor processed products can be provided.

Claims (5)

An acid gas adsorbent composed of sodium silicate and having a chemical adsorption capacity of acetic acid gas of 20 mL / g or more , wherein the acid gas contains at least one of acetic acid, isovaleric acid and butyric acid. , Acid gas adsorbent . The acid gas adsorbent according to claim 1, wherein sodium silicate is represented by the following formula (1).
Na ₂ O ・ mSiO ₂・ nH ₂ O (1)
In the formula (1), m and n are positive numbers, which satisfy m = 0.8 to 4.4 and n = 0.01 to 8.0. The acid gas adsorbent according to claim 1 or 2, wherein the average particle size measured by a laser diffraction particle size distribution meter is 0.1 μm to 20 μm. The adsorbent for acid gas according to any one of claims 1 to 3, wherein sodium silicate is crystalline. A deodorant processed product, which comprises applying or kneading the acid gas adsorbent according to any one of claims 1 to 4 to a resin.