A porous microcrystalline slow-release type chlorinedioxide aldehyde-removing gel, a preparation method and application thereof

Abstract

The present application provides a porous microcrystalline slow-release type supported chlorine dioxide aldehyde removal gel and a preparation method and application thereof. The porous microcrystalline slow-release type supported chlorine dioxide aldehyde removal gel comprises the following preparation raw materials in parts by weight: 1-7 parts of chlorine dioxide precursor, 0.5-5 parts of activator, 2-6 parts of gel agent, 0.1-4 parts of porous microcrystalline slow-release agent, 0.1-3 parts of stabilizer, and 70-220 parts of water. The preparation process of the present application is simple, does not need heating, and has low cost. The porous microcrystalline material is used to assist slow release, so that chlorine dioxide can be slowly and continuously released, and the present application is safe and stable, and is suitable for aldehyde removal, sterilization and disinfection in various occasions.

Description

Technical Field

[0001] This invention relates to the fields of formaldehyde removal and sterilization, specifically to a porous microcrystalline slow-release immobilized chlorine dioxide formaldehyde removal gel applicable to the field of air purification technology, its preparation method, and its application. Background Technology

[0002] Formaldehyde, also known as methanal, is a colorless gas with a pungent, irritating odor and is classified as a Group 1 carcinogen by the World Health Organization. With the improvement of living standards and rapid economic development, indoor environmental pollution from new home renovations in my country has become increasingly serious in recent years, attracting growing attention and concern. my country's national standard stipulates that indoor formaldehyde concentration should not exceed 0.08 mg / m³. 3 When people are exposed to environments with excessive formaldehyde concentrations for extended periods, it can cause allergic dermatitis, pigmentation, headaches, dizziness, fatigue, nausea, vomiting, memory loss, and nervous disorders. Furthermore, prolonged inhalation by pregnant women may lead to fetal malformations or even death, seriously endangering people's physical and mental health. Therefore, efficient removal of indoor formaldehyde is of paramount importance.

[0003] Chlorine dioxide is an internationally recognized safe, highly effective, and environmentally friendly disinfectant with strong oxidizing properties. Through chemical reactions, it can significantly decompose harmful components in the air, such as formaldehyde, sulfides, and benzene compounds, as well as bacteria, into non-toxic substances without causing secondary pollution. Therefore, chlorine dioxide products have a very broad application prospect. However, due to the instability of chlorine dioxide in its liquid or gaseous state, its easy decomposition by light, and its explosiveness, its production, packaging, transportation, storage, and use are greatly limited. Therefore, immobilized chlorine dioxide products have emerged.

[0004] CN111567552A discloses a slow-release chlorine dioxide air purifying gel, comprising a chlorine dioxide disinfectant, a slow-release agent, a gelling agent, and deionized water. The chlorine dioxide disinfectant is composed of sodium chlorite, citric acid, sodium chloride, sodium bicarbonate, and magnesium sulfate. The slow-release agent is composed of sodium dihydrogen phosphate, polyethylene glycol, and citric acid. The gelling agent is sodium carboxymethyl cellulose. This slow-release chlorine dioxide air purifying gel can effectively remove harmful indoor gases, achieving a formaldehyde removal rate of 91.7%, and has a simple composition and convenient preparation method. However, it does not disclose the stability and rate of chlorine dioxide release.

[0005] CN112136827A discloses a slow-release chlorine dioxide solid gel, comprising a parent gel (component A) and an activating gel (component B). The parent gel (component A) is composed of chlorine dioxide active components, modified mesoporous silica nanomaterials, and gel powder. The activating gel (component B) is composed of an activator, a slow-release agent, and gel powder. This slow-release chlorine dioxide solid gel enables real-time environmental purification, significantly improving the bactericidal efficiency of chlorine dioxide and solving the key problems of instability and short shelf life of liquid chlorine dioxide. However, the effective period of this slow-release chlorine dioxide solid gel is relatively short, lasting only 12 hours.

[0006] Based on the above research, it can be seen that fixed-load chlorine dioxide products are currently widely used to absorb formaldehyde and achieve air purification. However, the removal of indoor pollutants such as formaldehyde requires a certain amount of time, and the release rate of current chlorine dioxide products is unstable during use, leading to a significant decrease in formaldehyde removal efficiency in the later stages. Therefore, finding a convenient and continuously stable fixed-load chlorine dioxide product is of great importance in the field of air purification technology. Summary of the Invention

[0007] To address the shortcomings of existing technologies and practical needs, the present invention aims to provide a porous microcrystalline slow-release immobilized chlorine dioxide formaldehyde removal gel, its preparation method, and its applications. The porous microcrystalline slow-release immobilized chlorine dioxide formaldehyde removal gel can safely, continuously, stably, and controllably release chlorine dioxide, achieving excellent formaldehyde removal effects.

[0008] To achieve this objective, the present invention adopts the following technical solution:

[0009] In a first aspect, the present invention provides a porous microcrystalline sustained-release chlorine dioxide-supported formaldehyde removal gel, wherein the porous microcrystalline sustained-release chlorine dioxide-supported formaldehyde removal gel comprises the following raw materials by weight: 1-7 parts of chlorine dioxide precursor, 0.5-5 parts of activator, 2-6 parts of gelling agent, 0.1-4 parts of porous microcrystalline sustained-release agent, 0.1-3 parts of stabilizer, and 70-220 parts of water.

[0010] The 1-7 portions can be 1 portion, 1.5 portions, 2 portions, 2.5 portions, 3 portions, 3.5 portions, 4 portions, 4.5 portions, 5 portions, 5.5 portions, 6 portions, 6.5 portions, or 7 portions, etc.

[0011] The 0.5-5 parts can be 0.5 parts, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, or 5 parts, etc.

[0012] The 2-6 portions can be 2 portions, 2.5 portions, 3 portions, 3.5 portions, 4 portions, 4.5 portions, 5 portions, 5.5 portions, or 6 portions, etc.

[0013] The 0.1-4 parts can be 0.1 parts, 0.5 parts, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, or 4 parts, etc.

[0014] The 0.1-3 parts can be 0.1 parts, 0.5 parts, 1 part, 1.5 parts, 2 parts, 2.5 parts, or 3 parts, etc.

[0015] The 70-220 portions can be 70 portions, 80 portions, 90 portions, 100 portions, 120 portions, 140 portions, 160 portions, 180 portions, 200 portions, or 220 portions, etc.

[0016] Other point values ​​within the above range can be selected, and will not be elaborated on here.

[0017] It should be noted that the porous microcrystalline slow-release agent used in this invention can adsorb and temporarily store chlorine dioxide gas generated by the gel. Over time, the stored chlorine dioxide gas is gradually released into the environment. The release rate is controllable, and the release time can reach up to 3 months, achieving formaldehyde removal and sterilization. Furthermore, the porous microcrystalline slow-release agent can actively capture harmful substances such as formaldehyde and volatile organic pollutants in the environment, decomposing them into harmless carbon dioxide and water, acting as a reactant carrier and further enhancing the formaldehyde removal effect.

[0018] The formaldehyde removal gel with chlorine dioxide immobilized in this invention is ready to use immediately after opening the cap, requiring no additional activation, and has the advantage of being easy to use.

[0019] Preferably, the porous microcrystalline sustained-release immobilized chlorine dioxide formaldehyde removal gel comprises the following raw materials by weight: 1-5 parts of chlorine dioxide precursor, 0.5-4 parts of activator, 2-5 parts of gelling agent, 0.1-3 parts of porous microcrystalline sustained-release agent, 0.1-2 parts of stabilizer, and 80-200 parts of water.

[0020] Preferably, the chlorine dioxide precursor includes any one or a combination of at least two of magnesium chlorite, sodium chlorite, barium chlorite, sodium chlorate, sodium hypochlorite, or magnesium hypochlorite. The combination of at least two can be a combination of magnesium chlorite and sodium chlorite or a combination of sodium chlorite and barium chlorite, etc. Any other combination is acceptable, and will not be described in detail here.

[0021] The components provided by this invention can all serve as chlorine dioxide precursors. After reacting with the activator, they can effectively release chlorine dioxide gas, thereby achieving the effect of formaldehyde removal.

[0022] Preferably, the activator includes any one or a combination of at least two of citric acid, oxalic acid, aminosulfonic acid, p-toluenesulfonic acid monohydrate, phosphoric acid, malic acid, or acetic acid. The combination of at least two can be a combination of citric acid and oxalic acid or a combination of oxalic acid and aminosulfonic acid, etc. Any other combination is acceptable, and will not be described in detail here.

[0023] The components provided by this invention can all be used as activators, enabling the chlorine dioxide precursor to release chlorine dioxide gas.

[0024] Preferably, the gelling agent is any one or a combination of at least two of propylene glycol alginate, xanthan gum, sodium polyacrylate, or resin. The combination of at least two can be a combination of propylene glycol alginate and xanthan gum, or a combination of propylene glycol alginate and resin, etc. Any other combination is acceptable and will not be elaborated further here. A combination of resin and propylene glycol alginate is preferred.

[0025] This invention selects any one or a combination of at least two of propylene glycol alginate, xanthan gum, sodium polyacrylate, or resin as a gelling agent because it can produce gels with excellent properties in terms of hardness and viscoelasticity. A combination of resin and propylene glycol alginate is preferred because the compounded resin and propylene glycol alginate have a significant synergistic effect, resulting in gels with superior water retention.

[0026] Preferably, the porous microcrystalline slow-release agent comprises any one or a combination of at least two of the following: X-type molecular sieve, diatomaceous earth, maifanite, ZSM-5 molecular sieve, β-molecular sieve, Y-type molecular sieve, or MCM-22 molecular sieve. The combination of at least two can be a combination of X-type molecular sieve and diatomaceous earth, or a combination of diatomaceous earth and maifanite, etc. Any other combination is acceptable and will not be elaborated further here. A combination of X-type molecular sieve and ZSM-5 molecular sieve is preferred.

[0027] The components provided by this invention can all be used as porous microcrystalline slow-release agents for the secondary storage of chlorine dioxide gas, thereby effectively controlling the release rate of chlorine dioxide. The combination of X-type molecular sieve and ZSM-5 molecular sieve is preferred because its slow-release effect is better and it can stably and continuously release chlorine dioxide gas for formaldehyde removal.

[0028] Preferably, the stabilizer comprises any one or a combination of at least two of pregelatinized starch, sodium carboxymethyl cellulose, sodium sulfate, polyvinyl alcohol, or anhydrous magnesium sulfate. The combination of at least two may be a combination of pregelatinized starch and sodium carboxymethyl cellulose, or a combination of sodium carboxymethyl cellulose and sodium sulfate, etc. Any other combination is acceptable and will not be elaborated further here.

[0029] The preferred combination is pregelatinized starch, sodium carboxymethyl cellulose, and polyvinyl alcohol, because it can maintain the stability of the system and is more likely to form a gel.

[0030] In a second aspect, the present invention provides a method for preparing a porous microcrystalline sustained-release immobilized chlorine dioxide formaldehyde removal gel according to the first aspect, the preparation method comprising the following steps:

[0031] (1) Mix the gelling agent, chlorine dioxide precursor, stabilizer and water to obtain mixture A;

[0032] (2) Mix the porous microcrystalline slow-release agent with the mixture A obtained in step (1) to obtain mixture B;

[0033] (3) Mix the activator with the mixture B obtained in step (2) to obtain the porous microcrystalline sustained-release immobilized chlorine dioxide formaldehyde removal gel.

[0034] The preparation method provided by this invention requires no heating, has a simple production process, and is easy to industrialize and commercialize.

[0035] Preferably, the mixing temperature in step (1) is 20-25°C, and the mixing time in step (1) is 2-10 min.

[0036] The 20-25℃ can be 20℃, 21℃, 22℃, 23℃, 24℃, or 25℃, etc.

[0037] The 2-10 min can be 2 min, 3 min, 4 min, 5 min, 6 min, 7 min, 8 min, 9 min, or 10 min, etc.

[0038] Other point values ​​within the above range can be selected, and will not be elaborated on here.

[0039] Preferably, the mixing temperature in step (2) is 20-25°C, and the mixing time in step (2) is 2-10 min.

[0040] The 20-25℃ can be 20℃, 21℃, 22℃, 23℃, 24℃, or 25℃, etc.

[0041] The 2-10 min can be 2 min, 3 min, 4 min, 5 min, 6 min, 7 min, 8 min, 9 min, or 10 min, etc.

[0042] Other point values ​​within the above range can be selected, and will not be elaborated on here.

[0043] Preferably, the mixing temperature in step (3) is 20-25°C, and the mixing time in step (3) is 5-60 min.

[0044] The 20-25℃ can be 20℃, 21℃, 22℃, 23℃, 24℃, or 25℃, etc.

[0045] The 5-60 min can be 5 min, 10 min, 15 min, 20 min, 25 min, 30 min, 35 min, 40 min, 45 min, 50 min, 55 min, or 60 min, etc.

[0046] Other point values ​​within the above range can be selected, and will not be elaborated on here.

[0047] Preferably, the mixing method in steps (1), (2), and (3) is stirring, and the stirring speed is 200-1000 rpm.

[0048] The 200-1000rpm can be 200rpm, 300rpm, 400rpm, 500rpm, 600rpm, 700rpm, 800rpm, 900rpm, or 1000rpm, etc.

[0049] Other point values ​​within the above range can be selected, and will not be elaborated on here.

[0050] Thirdly, the present invention provides an application of the porous microcrystalline slow-release immobilized chlorine dioxide formaldehyde removal condenser according to the first aspect in the preparation of air purification products.

[0051] Compared with the prior art, the present invention has the following beneficial effects:

[0052] The porous microcrystalline slow-release agent used in this invention can adsorb chlorine dioxide gas generated by the gel and temporarily store it. Over time, the stored chlorine dioxide is gradually released into the environment, effectively controlling the release rate. The release time can reach up to 3 months, achieving formaldehyde removal and sterilization. Furthermore, the porous microcrystalline slow-release agent can actively capture harmful substances such as formaldehyde and volatile organic pollutants in the environment, decomposing them into harmless carbon dioxide and water, acting as a reactant carrier and further enhancing the formaldehyde removal effect. The preparation method of this invention requires no heating, has a simple production process, and is easily industrialized. Detailed Implementation

[0053] The technical solution of the present invention will be further illustrated below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be construed as limiting the invention in any way.

[0054] The sources of the materials and raw materials used in the following embodiments are as follows:

[0055] Among them, propylene glycol alginate was purchased from Jiangxi Baiying Biotechnology Co., Ltd. (food grade); resin was purchased from Jinan Huadi Industry and Trade Co., Ltd., model HD 200-400 mesh; agar powder was purchased from Shandong Datang Biotechnology Co., Ltd. (food grade); X-type molecular sieve was purchased from Pingxiang Zhuoyue Filler Mall Co., Ltd., with a bulk density of 0.5 g / mL and a particle size of 0.045 mm; pregelatinized starch was purchased from Hebei Yanxing Chemical Co., Ltd., model corn high viscosity; ZSM-5 molecular sieve was purchased from Shandong Dengzhuo Chemical Co., Ltd., with a bulk density of 0.45 g / mL; and NaA molecular sieve was purchased from Jiangxi Xintao Technology Co., Ltd., with a specific surface area of ​​450 m². 2 / g, bulk density 0.45g / mL; activated carbon purchased from Foshan Bashan Environmental Protection Chemical Co., Ltd., particle size 200 mesh, iodine value 1000mg / g. Unless otherwise specified, all other materials and raw materials were available from other commercial sources.

[0056] Example 1

[0057] This embodiment provides a porous microcrystalline sustained-release immobilized chlorine dioxide formaldehyde removal gel, comprising the following components by weight: 2 parts sodium chlorite, 0.5 parts oxalic acid, 2 parts propylene glycol alginate, 1 part resin, 2 parts X-type molecular sieve, 1 part pregelatinized starch, and 80 parts water. The preparation method is as follows:

[0058] (1) Sodium chlorite, oxalic acid, propylene glycol alginate, resin, X-type molecular sieve and pregelatinized starch were ground separately in a ball mill and passed through a 100-mesh sieve for later use;

[0059] (2) According to the formula, take propylene glycol alginate, resin, sodium chlorite and pregelatinized starch into a beaker and mix them thoroughly. After pouring in water, mix with mechanical stirring. Set the temperature to 25℃ and the speed to 300rpm, and stir for 10min to obtain mixture A.

[0060] (3) Add the X-type molecular sieve of the formula amount to mixture A, set the temperature to 25℃, the rotation speed to 800rpm, and mechanically stir for 5min to obtain mixture B;

[0061] (4) Finally, the amount of oxalic acid in the formula is added to mixture B, the temperature is set at 25℃, the speed is 400rpm, and the mechanical stirring is carried out for 30min to obtain the porous microcrystalline sustained-release solidified chlorine dioxide formaldehyde removal gel.

[0062] Example 2

[0063] This embodiment provides a porous microcrystalline sustained-release immobilized chlorine dioxide formaldehyde removal gel, comprising the following components by weight: 3 parts magnesium chlorite, 2.5 parts citric acid, 1.5 parts propylene glycol alginate, 1.5 parts resin, 2 parts ZSM-5 molecular sieve, 1 part sodium carboxymethyl cellulose, and 120 parts water. The preparation method is as follows:

[0064] (1) Potassium chlorite, citric acid, propylene glycol alginate, resin, ZSM-5 molecular sieve, and sodium carboxymethyl cellulose were ground separately in a ball mill and passed through a 100-mesh sieve for later use.

[0065] (2) According to the formula, take propylene glycol alginate, resin, magnesium chlorite and sodium carboxymethyl cellulose into a beaker and mix them thoroughly. Pour in the formula amount of water and mix with mechanical stirring. Set the temperature to 25℃, the speed to 400rpm and stir for 8min to obtain mixture A.

[0066] (3) Add the ZSM-5 molecular sieve of the formula amount to mixture A, set the temperature to 25℃, the speed to 350rpm, and mechanically stir for 9min to obtain mixture B;

[0067] (4) Finally, the amount of citric acid in the formula is added to mixture B, the temperature is set at 25℃, the speed is 900rpm, and the mixture is mechanically stirred for 50min to obtain the porous microcrystalline slow-release type solidified chlorine dioxide formaldehyde removal gel.

[0068] Example 3

[0069] This embodiment provides a porous microcrystalline sustained-release immobilized chlorine dioxide formaldehyde removal gel, comprising the following components by weight: 4.5 parts magnesium chlorite, 3.5 parts citric acid, 1 part propylene glycol alginate, 2 parts resin, 2 parts ZSM-5 molecular sieve, 1 part polyvinyl alcohol, and 150 parts water. The preparation method is as follows:

[0070] (1) Grind magnesium chlorite, citric acid, propylene glycol alginate, resin, ZSM-5 molecular sieve and polyvinyl alcohol separately in a ball mill and pass them through a 100-mesh sieve for later use;

[0071] (2) According to the formula, take propylene glycol alginate, resin, magnesium chlorite and polyvinyl alcohol into a beaker and mix them thoroughly. Pour in the formula amount of water and mix with mechanical stirring. Set the temperature to 25℃ and the speed to 600rpm and stir for 5min to obtain mixture A.

[0072] (3) Add the ZSM-5 molecular sieve of the formula amount to mixture A, set the temperature to 25℃, the speed to 350rpm, and mechanically stir for 10min to obtain mixture B;

[0073] (4) Finally, the amount of citric acid in the formula is added to mixture B, the temperature is set at 25℃, the speed is 400rpm, and the mechanical stirring is carried out for 60min to obtain the porous microcrystalline slow-release type solidified chlorine dioxide formaldehyde removal gel.

[0074] Example 4

[0075] This embodiment provides a porous microcrystalline slow-release immobilized chlorine dioxide formaldehyde removal gel, which differs from Example 1 only in that the 2 parts of the X-type molecular sieve are replaced with "1.2 parts of X-type molecular sieve and 0.8 parts of ZSM-5 molecular sieve", while the other parameters remain the same as in Example 1. The preparation method is the same as in Example 1.

[0076] Example 5

[0077] This embodiment provides a porous microcrystalline slow-release immobilized chlorine dioxide formaldehyde removal gel, which differs from Example 1 only in that the 2 parts of the X-type molecular sieve are replaced with "1.33 parts of NaA molecular sieve and 0.67 parts of activated carbon", while the other parameters remain the same as in Example 1. The preparation method is the same as in Example 1.

[0078] Example 6

[0079] This embodiment provides a porous microcrystalline sustained-release immobilized chlorine dioxide formaldehyde removal gel, which differs from Example 1 only in that the raw materials used in its preparation do not include resin; the reduced mass is compensated by propylene glycol alginate, while the remaining parameters remain consistent with Example 1. The preparation method is the same as in Example 1.

[0080] Example 7

[0081] This embodiment provides a porous microcrystalline sustained-release immobilized chlorine dioxide formaldehyde removal gel, which differs from Example 1 only in that the raw materials used in its preparation do not include propylene glycol alginate; the reduced mass is compensated for by resin. All other parameters remain the same as in Example 1. The preparation method is the same as in Example 1.

[0082] Example 8

[0083] This embodiment provides a porous microcrystalline sustained-release immobilized chlorine dioxide formaldehyde removal gel, which differs from Example 1 only in that the resin is replaced with an equal amount of agar, while the other parameters remain the same as in Example 1. The preparation method is the same as in Example 1.

[0084] Example 9

[0085] This embodiment provides a porous microcrystalline sustained-release immobilized chlorine dioxide formaldehyde removal gel, which differs from Example 1 only in that 1 part of pregelatinized starch is replaced with "0.3 parts of pregelatinized starch, 0.3 parts of sodium carboxymethyl cellulose, and 0.4 parts of polyvinyl alcohol", while the other parameters remain the same as in Example 1. The preparation method is the same as in Example 1.

[0086] Example 10

[0087] This embodiment provides a porous microcrystalline sustained-release immobilized chlorine dioxide formaldehyde removal gel, comprising the following components by weight: 2 parts sodium chlorite, 0.5 parts acetic acid, 3 parts xanthan gum, 2 parts X molecular sieve, 1 part pregelatinized starch, and 80 parts water. The preparation method is as follows:

[0088] (1) Sodium chlorite, acetic acid, xanthan gum, X-type molecular sieve and pregelatinized starch were ground separately in a ball mill and passed through a 100-mesh sieve for later use;

[0089] (2) According to the formula, xanthan gum, sodium chlorite, pregelatinized starch and X-type molecular sieve are mixed in a beaker. Water is poured in and mixed with mechanical stirring. The temperature is set at 25℃ and the speed is 400rpm. Stir for 10min to obtain the mixture.

[0090] (3) Add the amount of acetic acid in the formula to the mixture, set the temperature to 25℃, the speed to 400rpm, and mechanically stir for 30min to obtain the porous microcrystalline slow-release type solidified chlorine dioxide formaldehyde removal gel.

[0091] Comparative Example 1

[0092] This comparative example provides a chlorine dioxide formaldehyde removal gel, which differs from Example 1 only in that the raw materials used in preparing the chlorine dioxide formaldehyde removal gel do not include X-type molecular sieves; all other parameters remain the same as in Example 1. The preparation method is the same as in Example 1.

[0093] Test Example 1

[0094] Referring to the test method in patent document CN105145626A, the chlorine dioxide release rate and release time of the chlorine dioxide gels obtained in Examples 1-10 and Comparative Example 1 were tested.

[0095] The test results are shown in Table 1 below:

[0096] Table 1

[0097]

[0098]

[0099] The data above show that, compared with Examples 1-3, the porous microcrystalline slow-release chlorine dioxide-supported aldehyde removal gel provided by this invention can effectively control the chlorine dioxide release rate, with a release time of up to 3 months. Data from Examples 4-5 shows that when the porous microcrystalline slow-release agent is a combination of X-type molecular sieve and ZSM-5 molecular sieve, the prepared gel has a better effect on controlling the chlorine dioxide release rate. Data from Examples 6-8 shows that when the gelling agent is not a combination of propylene glycol alginate and resin, the effect of the prepared gel on controlling the chlorine dioxide release rate is affected. Data from Example 9 shows that when the stabilizer is a combination of pregelatinized starch, sodium carboxymethyl cellulose, and polyvinyl alcohol, the prepared gel has a better effect on controlling the chlorine dioxide release rate. Data from Example 10 shows that directly mixing the microcrystalline corrosion inhibitor with the chlorine dioxide precursor, gelling agent, and stabilizer affects the effect of the prepared gel on controlling the chlorine dioxide release rate.

[0100] In summary, the porous microcrystalline slow-release agent used in this invention can adsorb and temporarily store chlorine dioxide gas generated by the gel. Over time, it gradually releases the stored chlorine dioxide into the environment, effectively controlling the release rate. The release time can reach up to 3 months, achieving formaldehyde removal and sterilization. Furthermore, the porous microcrystalline slow-release agent can actively capture harmful substances such as formaldehyde and volatile organic compounds in the environment, decomposing them into harmless carbon dioxide and water, acting as a reactant carrier and further enhancing the formaldehyde removal effect. The preparation method of this invention requires no heating, has a simple production process, and is easily industrialized.

[0101] The applicant declares that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. A porous microcrystalline sustained-release immobilized chlorine dioxide formaldehyde removal gel, characterized in that, The porous microcrystalline sustained-release immobilized chlorine dioxide formaldehyde removal gel comprises the following raw materials by weight: 1-7 parts of chlorine dioxide precursor, 0.5-5 parts of activator, 2-6 parts of gelling agent, 0.1-4 parts of porous microcrystalline sustained-release agent, 0.1-3 parts of stabilizer, and 70-220 parts of water. The gelling agent is a combination of resin and propylene glycol alginate. The stabilizer is a combination of pregelatinized starch, sodium carboxymethyl cellulose, and polyvinyl alcohol.

2. The porous microcrystalline sustained-release immobilized chlorine dioxide formaldehyde removal gel according to claim 1, characterized in that, The porous microcrystalline sustained-release immobilized chlorine dioxide formaldehyde removal gel comprises the following raw materials by weight: 1-5 parts of chlorine dioxide precursor, 0.5-4 parts of activator, 2-5 parts of gelling agent, 0.1-3 parts of porous microcrystalline sustained-release agent, 0.1-2 parts of stabilizer, and 80-200 parts of water.

3. The porous microcrystalline sustained-release immobilized chlorine dioxide formaldehyde removal gel according to claim 1, characterized in that, The chlorine dioxide precursor includes any one or a combination of at least two of magnesium chlorite, sodium chlorite, barium chlorite, sodium chlorate, sodium hypochlorite, or magnesium hypochlorite.

4. The porous microcrystalline sustained-release immobilized chlorine dioxide formaldehyde removal gel according to claim 1, characterized in that, The activator includes any one or a combination of at least two of the following: citric acid, oxalic acid, aminosulfonic acid, p-toluenesulfonic acid monohydrate, phosphoric acid, malic acid, or acetic acid.

5. The porous microcrystalline sustained-release immobilized chlorine dioxide formaldehyde removal gel according to claim 1, characterized in that, The porous microcrystalline slow-release agent includes any one or a combination of at least two of the following: X-type molecular sieve, diatomaceous earth, maifanite, ZSM-5 molecular sieve, β-molecular sieve, Y-type molecular sieve, or MCM-22 molecular sieve.

6. The porous microcrystalline sustained-release immobilized chlorine dioxide formaldehyde removal gel according to claim 5, characterized in that, The porous microcrystalline slow-release agent is a combination of X-type molecular sieve and ZSM-5 molecular sieve.

7. The method for preparing porous microcrystalline sustained-release immobilized chlorine dioxide formaldehyde removal gel according to any one of claims 1-6, characterized in that, The preparation method includes the following steps: (1) Mix the gelling agent, chlorine dioxide precursor, stabilizer and water to obtain mixture A; (2) Mix the porous microcrystalline slow-release agent with the mixture A obtained in step (1) to obtain mixture B; (3) Mix the activator with the mixture B obtained in step (2) to obtain the porous microcrystalline sustained-release immobilized chlorine dioxide formaldehyde removal gel.

8. The preparation method according to claim 7, characterized in that, The mixing temperature in step (1) is 20-25℃, and the mixing time in step (1) is 2-10 min.

9. The preparation method according to claim 7, characterized in that, The mixing temperature in step (2) is 20-25℃, and the mixing time in step (2) is 2-10 min.

10. The preparation method according to claim 7, characterized in that, The mixing temperature in step (3) is 20-25℃, and the mixing time in step (3) is 5-60 min.

11. The preparation method according to claim 7, characterized in that, The mixing method described in steps (1), (2), and (3) is stirring, and the stirring speed is 200-1000 rpm.

12. The application of the porous microcrystalline sustained-release immobilized chlorine dioxide formaldehyde removal gel according to any one of claims 1-6 in the preparation of air purification products.

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