Efficient and lasting multifunctional refrigerator deodorant and preparation method thereof

Abstract

The invention discloses an efficient and lasting multifunctional refrigerator deodorant which comprises the following components: (a) 50-85wt% of a porous adsorption material with a high specific surface area; (b) 5-30 wt% of a catalyst capable of effectively catalyzing and decomposing organic odor molecules in a low-temperature environment of 0-10 DEG C; and (c) 3 to 15 weight percent of long-acting slow-release type broad-spectrum antibacterial agent. According to the efficient and lasting refrigerator deodorant and the preparation method thereof, the dual effects of physical adsorption and low-temperature catalytic decomposition are utilized, multiple types of peculiar smell molecules can be rapidly adsorbed and thoroughly decomposed, and the deodorization efficiency is remarkably higher than that of a single adsorbent; the service life is greatly prolonged and is 3-5 times that of common activated carbon, the food decay speed is reduced, the food fresh-keeping period is indirectly prolonged, and food safety is guaranteed. The use process is safe and reliable, the use is convenient, external conditions such as illumination and heating are not needed, the device can be directly placed in a refrigerator, the replacement frequency is reduced due to long-term effect, and the comprehensive use cost is low.

Description

Technical Field

[0001] The present invention relates to the technical field of daily chemicals and household products, and in particular to a high-efficiency, long-lasting, multifunctional refrigerator deodorant and a preparation method thereof. Background Art

[0002] Refrigerators are essential food storage devices for households. They often produce mixed odors due to the storage of a variety of foods with different odors (such as seafood, onions, garlic, leftovers, dairy products, etc.). These odors not only affect the user experience but may also cross-contaminate other foods, affecting the flavor and quality of the food.

[0003] Activated carbon adsorption is currently the most commonly used deodorization method, relying primarily on physical adsorption. However, its adsorption capacity is limited, and it easily becomes saturated and ineffective, requiring frequent replacement or regeneration (e.g., exposure to sunlight). Furthermore, it is ineffective at adsorbing low-concentration odors or certain specific odor molecules (such as amines and sulfides). Once saturated, it can become a source of secondary pollution.

[0004] Using essences, lemon slices, tea leaves, etc. to mask odors cannot fundamentally eliminate the source of the odor. The mixed odors may produce a more unpleasant odor and have no inhibitory effect on microorganisms. Using chemical products such as baking soda (sodium bicarbonate) mainly neutralizes acidic odors and has limited effect on alkaline or neutral odors. The effect is slow and the duration is poor. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a high-efficiency and long-lasting multifunctional refrigerator deodorizer with high adsorption efficiency, long-lasting effect, broad-spectrum deodorization (targeting multiple odor molecules) and antibacterial function, and a preparation method thereof.

[0006] In order to solve the above technical problems, the technical solution of the present invention is: a high-efficiency and long-lasting multifunctional refrigerator deodorizer, comprising:

[0007] (a) 50-85 wt% of a porous adsorbent material with a high specific surface area;

[0008] (b) 5-30 wt% of a catalyst capable of effectively catalyzing the decomposition of organic odor molecules at a low temperature of 0-10°C;

[0009] (c) 3-15 wt% of a long-acting sustained-release broad-spectrum antibacterial agent.

[0010] Preferably, the porous adsorption material is selected from one or more of modified activated carbon, zeolite molecular sieve, diatomaceous earth, and metal organic framework materials (MOFs).

[0011] Preferably, the catalyst is a supported noble metal nanocatalyst, a transition metal oxide catalyst or a composite thereof.

[0012] Preferably, the catalyst is one or more of Pt / TiO2, Pd / Al2O3, MnO2-CeO2, and CuO-ZnO-Al2O3.

[0013] Preferably, the antibacterial agent is microencapsulated plant essential oil, food-grade organic acid salt or composite silver antibacterial agent.

[0014] Preferably, 0-10 wt% of a binder is further included.

[0015] Preferably, the adhesive is: food-grade sodium carboxymethyl cellulose, sodium alginate, or starch.

[0016] A method for preparing a high-efficiency, long-lasting, multifunctional refrigerator deodorizer comprises the following steps: pretreating an adsorption material; preparing or obtaining a low-temperature catalyst; preparing or obtaining a long-acting sustained-release antibacterial agent; uniformly mixing the adsorption material, catalyst, antibacterial agent, and an optional binder; optionally shaping the mixture; drying; and packaging.

[0017] Preferably, the pretreatment includes acid washing, alkali washing or high-temperature activation; when the antibacterial agent is a plant essential oil, the preparation method includes microencapsulation treatment thereof.

[0018] The invention discloses a multifunctional refrigerator deodorant which is highly efficient and long-lasting and is used for eliminating odors, inhibiting microbial growth and extending the shelf life of food in refrigerators, freezers and other refrigeration equipment.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention utilizes the dual effects of physical adsorption and low-temperature catalytic decomposition to quickly adsorb and thoroughly decompose various types of odor molecules (hydrogen sulfide, ammonia, amines, aldehydes, organic acids, alkanes, etc.), and the deodorization efficiency is significantly higher than that of a single adsorbent.

[0021] 2. The present invention utilizes catalytic decomposition to regenerate adsorption sites, thus avoiding the problem of traditional adsorbents being easily saturated and ineffective; the sustained-release antibacterial agent acts continuously, inhibiting the generation of odor from the source, and greatly extending the service life, which is 3-5 times that of ordinary activated carbon.

[0022] 3. Broad-spectrum antimicrobial agents effectively inhibit the growth of common spoilage bacteria and pathogenic bacteria in the refrigerator, reduce the rate of food spoilage, indirectly extend the shelf life of food, and ensure food safety.

[0023] 4. The catalytic components are specially designed and optimized for the low temperature environment of the refrigerator. They can still maintain high catalytic activity at 0-10℃ to ensure the decomposition effect.

[0024] 5. The materials selected in the present invention all meet the food contact safety standards, no harmful substances are released, and the decomposition products are harmless CO2 and water. The use process is safe and reliable, easy to use, and does not require external conditions such as light and heating. It can be placed directly in the refrigerator. The long-term effect reduces the frequency of replacement and the comprehensive use cost is low. DETAILED DESCRIPTION

[0025] The following is a further description of specific embodiments of the present invention. It should be noted that the description of these embodiments is intended to facilitate understanding of the present invention and does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0026] Example 1

[0027] The invention discloses a high-efficiency, long-lasting and multifunctional refrigerator deodorizer, comprising: modified coconut shell activated carbon (70%), MnO2-CeO2 composite oxide catalyst (15%), silver-loaded zeolite antibacterial agent (10%) and sodium carboxymethyl cellulose (5%).

[0028] A method for preparing a high-efficiency, long-lasting, multifunctional refrigerator deodorizer, comprising:

[0029] Treat coconut shell activated carbon with nitric acid solution, wash with water until neutral, and dry for later use;

[0030] MnO2-CeO2 composite oxide was prepared by co-precipitation method and ground and sieved;

[0031] The modified activated carbon, MnO2-CeO2 catalyst, silver-loaded zeolite, and CMC-Na powder were mixed in a V-type mixer for 1 hour;

[0032] Add appropriate amount of deionized water and stir evenly into a plastic paste;

[0033] Use a mold to press into a round cake with a diameter of about 5 cm and a thickness of about 1 cm;

[0034] Dry at 60°C for 24 hours to constant weight;

[0035] Put it into a perforated non-woven bag and then seal it in an aluminum foil composite film bag.

[0036] Example 2

[0037] 5A zeolite molecular sieve (60%), nano-Pt-loaded TiO2 low-temperature catalyst (25%), microencapsulated tea tree essential oil (12%), and sodium alginate (3%).

[0038] The preparation method is as follows:

[0039] Select 5A zeolite molecular sieve and dry it for later use;

[0040] Highly active Pt nanoparticles are evenly dispersed on the TiO2 surface. TiO2 powder is selected and calcined at 400-600°C to remove organic impurities, increase crystallinity, and stabilize the crystalline phase. The TiO2 surface is acid-washed to adjust the surface hydroxyl density and charge properties, which is beneficial to the subsequent adsorption and dispersion of Pt species. The precursor platinum nitrate (Pt(NO3)2) is selected and the accurately weighed platinum precursor is dissolved in deionized water solvent. The loaded sample is loaded using the equal volume impregnation method and the loaded wet solid is dried overnight at 80-120°C to remove physically adsorbed water and solvent and avoid high temperature that causes migration and aggregation of Pt species. The sample is reduced / activated and heated in a tube furnace under flowing H2. The loaded sample is treated with a strong reducing agent NaBH4 in the solution and set aside.

[0041] Mixing tea tree essential oil with a wall material solution to form an emulsion, spray drying to evaporate the solvent, and allowing the wall material to solidify on the surface of the tea tree essential oil droplets to form microcapsules for later use;

[0042] 5A zeolite molecular sieve, nano-Pt-loaded TiO2 low-temperature catalyst, microencapsulated tea tree essential oil, and sodium alginate were mixed in a V-type mixer for 1 hour;

[0043] Add appropriate amount of deionized water and stir evenly into a plastic paste;

[0044] Use a mold to press into a round cake with a diameter of about 5 cm and a thickness of about 1 cm;

[0045] Dry at 60°C for 24 hours to constant weight;

[0046] Put it into a perforated non-woven bag and then seal it in an aluminum foil composite film bag.

[0047] In order to verify the beneficial effects of the present invention, the deodorization efficiency test was carried out on the embodiments of the present invention:

[0048] A standard odor gas (a mixture of ammonia, hydrogen sulfide, and methyl mercaptan) was injected into a sealed test chamber (simulating a refrigerator environment, 5°C) and the product of Example 1 was placed in it. Gas chromatography showed that the odor removal rate exceeded 98% within 24 hours, far exceeding that of ordinary activated carbon (approximately 70%) and a commercially available deodorant (approximately 85%) under the same conditions.

[0049] Durability test: After the product of Example 1 was used continuously for 3 months, under the same test conditions, the 24-hour deodorization efficiency was still maintained at above 92%.

[0050] Antibacterial test: According to relevant national standards, the antibacterial rates of the product in Example 1 against Escherichia coli, Staphylococcus aureus, and Aspergillus niger were all >99%.

[0051] Food preservation tests: Fresh strawberries were placed in sealed boxes containing the deodorant and those without the deodorant in the same refrigerator. Observations showed that the strawberries treated with the deodorant experienced a significantly slower spoilage rate and their shelf life was extended by approximately 40%.

[0052] Example 2 was tested using the same method, injecting a standard odorous gas (a mixture of ammonia, hydrogen sulfide, and methyl mercaptan) into a sealed chamber (simulating a refrigerator environment, 5°C) and placing the product in Example 2. Gas chromatography revealed a 24-hour odor removal rate exceeding 99%, significantly higher than that of conventional activated carbon (approximately 70%) and a commercially available deodorant (approximately 85%) under the same conditions.

[0053] Durability test: After the product of Example 2 was used continuously for 3 months, under the same test conditions, the 24-hour deodorization efficiency was still maintained at above 93%.

[0054] Antibacterial test: According to relevant national standards, the antibacterial rates of the product in Example 2 against Escherichia coli, Staphylococcus aureus, and Aspergillus niger were all >99%.

[0055] Food preservation tests: Fresh strawberries were placed in sealed boxes containing the deodorant and those without the deodorant in the same refrigerator. Observations showed that the strawberries treated with the deodorant experienced a significantly slower spoilage rate, extending their shelf life by approximately 45%.

[0056] The embodiments of the present invention are described in detail above, but the present invention is not limited to the described embodiments. It is apparent to those skilled in the art that various changes, modifications, substitutions, and variations of these embodiments may be made without departing from the principles and spirit of the present invention, and the changes still fall within the scope of protection of the present invention.

Claims

1. A high-efficiency and long-lasting multifunctional refrigerator deodorizer, characterized in that: include: (a) 50-85 wt% of a porous adsorbent material with a high specific surface area; (b) 5-30 wt% of a catalyst capable of effectively catalyzing the decomposition of organic odor molecules at a low temperature of 0-10°C; (c) 3-15 wt% of a long-acting sustained-release broad-spectrum antibacterial agent.

2. The high-efficiency, long-lasting, multifunctional refrigerator deodorizer according to claim 1, characterized in that: The porous adsorption material is selected from one or more of modified activated carbon, zeolite molecular sieve, diatomaceous earth, and metal organic framework materials (MOFs).

3. The high-efficiency, long-lasting, multifunctional refrigerator deodorizer according to claim 1, characterized in that: The catalyst is a supported noble metal nanocatalyst, a transition metal oxide catalyst or a composite thereof.

4. The high-efficiency, long-lasting, multifunctional refrigerator deodorizer according to claim 3, characterized in that: The catalyst is one or more of Pt / TiO2, Pd / Al2O3, MnO2-CeO2, and CuO-ZnO-Al2O3.

5. The high-efficiency, long-lasting, multifunctional refrigerator deodorizer according to claim 1, characterized in that: The antibacterial agent is microencapsulated plant essential oil, food-grade organic acid salt or composite silver antibacterial agent.

6. The high-efficiency, long-lasting, multifunctional refrigerator deodorizer according to any one of claims 1 to 5, characterized in that: It also contains 0-10 wt% of a binder.

7. The high-efficiency, long-lasting, multifunctional refrigerator deodorizer according to claim 6, characterized in that: The adhesive is food-grade sodium carboxymethyl cellulose, sodium alginate and starch.

8. A method for preparing the refrigerator deodorant according to any one of claims 1 to 5, characterized in that: The following steps are involved: Pretreating the adsorption material; preparing or obtaining the low-temperature catalyst; preparing or obtaining the long-acting sustained-release antibacterial agent; The adsorption material, catalyst, antimicrobial agent and optional binder are uniformly mixed; the mixture is optionally shaped; dried; and packaged.

9. The method according to claim 8, characterized in that The pretreatment includes acid washing, alkali washing or high-temperature activation; when the antibacterial agent is plant essential oil, the preparation method includes microencapsulation treatment thereof.

10. Use of the refrigerator deodorizer according to any one of claims 1 to 5 in refrigerators, freezers, and refrigeration equipment for eliminating odors, inhibiting microbial growth, and extending the shelf life of food.