Environmentally friendly sterilization and disinfection composition and preparation method thereof

Abstract

The invention discloses an environmentally friendly sterilization and disinfection composition and a preparation method thereof, and is specifically related to the technical field of disinfection, wherein the composition comprises by weight percentage: 60-80% sodium-method calcium hypochlorite compositely modified by specific rare earth metal oxide, 0.5-3% rare earth metal oxide content, 10-13% potassium dihydrogen phosphate, 3-5% potassium monopersulfate with an active oxygen content of ≥4%, 1-2% aluminum sulfate, 1-2% inorganic salt containing specific nano titanium dioxide, sodium hexametaphosphate and sodium aminosulfonate are mixed in a mass ratio of (3-5):1, and nano titanium dioxide is surface-modified, and the remainder is zwitterionic polyacrylamide treated by ultraviolet radiation. The present invention improves the stability of sodium-method calcium hypochlorite through the synergistic effect of each component, enhances bactericidal, antibacterial and antifouling properties, has good water purification and flocculation effects, performs excellently in water quality impact tests, has little impact on various water quality indicators, and meets environmental protection and disinfection requirements.

Description

Technical Field

[0001] The present invention relates to the field of disinfection technology, and more specifically, to an environmentally friendly sterilization and disinfection composition and a preparation method thereof. Background Art

[0002] As people's awareness of environmental hygiene and health continues to increase, sterilization and disinfection have become increasingly important in many fields, such as medical treatment, food processing, drinking water treatment, and public hygiene maintenance. However, existing sterilization and disinfection technologies and products face a series of challenges and limitations in practical applications.

[0003] In the medical field, the hospital environment is complex and there are various pathogens. The disinfection requirements for medical equipment, wards, operating rooms, etc. are extremely high. Traditional disinfection products may not be able to completely kill stubborn bacteria such as drug-resistant bacteria, which can easily cause cross-infection and pose a serious threat to patients' health. At the same time, some disinfection products may leave harmful substances after use, causing potential harm to medical staff and patients.

[0004] The food processing industry also has strict requirements for sterilization and disinfection. If the microorganisms on the food surface and processing equipment cannot be effectively removed, it will cause food spoilage, shorten the shelf life of food, and even cause food safety accidents, endangering the life and health of consumers. Some existing disinfection methods may have adverse effects on the quality of food, such as changing the taste, color or nutritional content of food.

[0005] In terms of drinking water treatment, ensuring water quality is of vital importance. Microorganisms such as bacteria, viruses, and parasites in water must be effectively controlled to prevent the spread of waterborne diseases. However, some traditional disinfectants may react with organic matter in water to generate harmful disinfection by-products, such as trihalomethanes, which have risks of carcinogenicity, teratogenicity, and mutagenicity to humans.

[0006] In public places, such as schools, shopping malls, hotels, etc., there are dense crowds of people, which makes it easy to spread germs. Existing disinfection measures may not be able to keep the environment clean and sanitary for a long time, and frequent disinfection operations are required, which not only consumes a lot of manpower, material and financial resources, but also may affect the normal use of public places.

[0007] In addition, with the increasing awareness of environmental protection, people have also put forward higher requirements for the environmental friendliness of sterilization and disinfection products. Some traditional disinfection products may cause environmental pollution during production, use or disposal, such as emitting toxic gases and generating difficult-to-degrade waste.

[0008] Therefore, an environmentally friendly sterilization and disinfection composition and a preparation method thereof are now proposed. Summary of the invention

[0009] In order to overcome the above defects of the prior art, the present invention provides an environmentally friendly sterilization and disinfection composition and a preparation method thereof to solve the problems raised in the above background technology.

[0010] To achieve the above object, the present invention provides the following technical solution: an environmentally friendly sterilization and disinfection composition, comprising, by weight percentage:

[0011] (a) 60-80% sodium-based calcium hypochlorite, wherein the sodium-based calcium hypochlorite is a pretreated modified sodium-based calcium hypochlorite, and the modified sodium-based calcium hypochlorite is compounded with a specific rare earth metal oxide, wherein the rare earth metal oxide is selected from at least one of lanthanum oxide, cerium oxide, and yttrium oxide, and the content of the rare earth metal oxide in the modified sodium-based calcium hypochlorite is 0.5-3%, and the outer 4f electrons of the rare earth element atoms in the rare earth metal oxide form coordination bonds or weak chemical bonds with the oxygen atoms in the hypochlorite ions to form stable hypochlorite ions, which are used to improve the stability of the sodium-based calcium hypochlorite.

[0012] Rare earth elements, such as lanthanum oxide, cerium oxide, and yttrium oxide, have unique electronic structures, and there are unfilled 4f orbitals in the outer electron configuration of their atoms. These unpaired electrons can interact electronically with the active groups in the sodium-based calcium hypochlorite molecules. Specifically, the 4f electrons of rare earth elements can form coordination bonds or weak chemical bonds with the oxygen atoms in the hypochlorite ion (ClO-), thereby stabilizing the hypochlorite ion and reducing its decomposition during storage and use, thereby improving the stability of sodium-based calcium hypochlorite.

[0013] Rare earth elements have rich electron transition energy levels. When stimulated by external energy, such as light or chemical reactions, their electrons can transition between different energy levels, producing special physical and chemical effects. This electron transition process can affect the electron cloud distribution of surrounding molecules, enhance the interaction between sodium-based calcium hypochlorite molecules and molecules on the surface of microbial cells, and make the sterilization process more efficient.

[0014] (b) 10-13% potassium dihydrogen phosphate.

[0015] (c) 3-5% potassium monopersulfate, wherein the active oxygen content of the potassium monopersulfate is ≥ 4%.

[0016] Rare earth metal oxides have certain oxidizing properties and catalytic activity, which can promote potassium monopersulfate to release more active oxygen components, such as hydroxyl radicals and sulfate radicals. These active oxygen components work synergistically with hypochlorous acid (HClO) produced by the decomposition of sodium-based calcium hypochlorite, enhancing the oxidative damage to microbial cell walls, cell membranes, and internal biomacromolecules, such as proteins and nucleic acids, thereby improving the bactericidal effect.

[0017] Rare earth elements can adjust the pH value and redox potential of the solution, creating a chemical environment that is more conducive to sterilization. Rare earth oxides can undergo hydrolysis in water, releasing a small amount of hydrogen ions or hydroxide ions, keeping the pH value of the solution within a suitable range and enhancing the bactericidal activity of sodium-based calcium hypochlorite and other active ingredients. At the same time, their regulation of redox potential can accelerate the imbalance of redox reactions in microbial cells, leading to the death of microorganisms.

[0018] (d) 1-2% aluminum sulfate.

[0019] (e) 1-2% of an inorganic salt, wherein the inorganic salt is a mixture of sodium hexametaphosphate and sodium aminosulfonate in a mass ratio of (3-5):1, and the inorganic salt is further added with 0.1-0.5% of nano-titanium dioxide accounting for the total mass of the inorganic salt, wherein the nano-titanium dioxide is surface-modified, and the modifier is selected from at least one of a silane coupling agent and a titanate coupling agent, and the addition of the nano-titanium dioxide is used to enhance the antibacterial and anti-fouling properties.

[0020] When nano-titanium dioxide is exposed to ultraviolet light (UV), it will generate electron-hole pairs (e - -h + ). The electrons in the valence band (e - ) is excited to jump to the conduction band, leaving a hole (h + ). These electrons and holes have strong redox capabilities.

[0021] The holes generated (h + ) can react with water molecules (H2O) adsorbed on the surface of nano-titanium dioxide to generate hydroxyl radicals (·OH). Hydroxyl radicals are a strong oxidant that can attack biological macromolecules in microbial cells, such as proteins and nucleic acids, destroying their structure and function, leading to the death of microorganisms.

[0022] The electrons in the conduction band (e - ) can react with oxygen molecules (O2) dissolved in water to generate superoxide anion free radicals (·O2 - ), superoxide anion radicals also have a certain oxidative capacity, further participating in the destruction of microorganisms. At the same time, superoxide anion radicals can also generate other reactive oxygen species (ROS) such as hydrogen peroxide (H2O2) through a series of reactions, which synergistically enhance the antibacterial effect.

[0023] After the surface of nano-titanium dioxide is modified with a silane coupling agent or a titanate coupling agent, the dispersibility of nano-titanium dioxide in the sterilization and disinfection composition is improved. Unmodified nano-titanium dioxide is easy to agglomerate, and the particle size of the agglomerated particles increases and the specific surface area decreases, resulting in a decrease in its photocatalytic active sites and a decrease in antibacterial performance. After surface modification, the interaction between nanoparticles is weakened, and they can be better dispersed in the composition, increasing the contact opportunities with microorganisms and other active ingredients, thereby improving the antibacterial efficiency.

[0024] Surface modifiers can also adjust the surface charge properties of nano-titanium dioxide. Specifically, silane coupling agents can introduce positively or negatively charged functional groups to generate electrostatic attraction or repulsion between the surface charge of nano-titanium dioxide and the surface charge of microorganisms, promote the interaction between nano-titanium dioxide and microorganisms, and enhance the antibacterial effect.

[0025] Under ultraviolet irradiation, active oxygen species produced by nano-titanium dioxide, such as hydroxyl radicals and superoxide anion radicals, can decompose organic pollutants adsorbed on the surface of objects. These organic pollutants can be metabolites secreted by microorganisms, organic impurities in water, etc. Their presence can cause problems such as surface dirtiness and bacterial growth. Active oxygen species can attack the chemical bonds in the molecules of organic pollutants and decompose them into small molecules of harmless substances such as carbon dioxide (CO2) and water (H2O), thereby achieving self-cleaning of the surface and enhancing anti-fouling ability.

[0026] The surface hydrophilicity of nano-titanium dioxide can be changed by using surface modifiers. Specifically, silane coupling agents are used to make the surface of nano-titanium dioxide have a certain degree of hydrophilicity. The hydrophilic surface can make water form a uniform water film on its surface, preventing organic pollutants and microorganisms from attaching to the surface. When pollutants contact the surface, they are more likely to be taken away by the water film instead of being deposited on the surface to form dirt, thereby keeping the surface clean and improving the anti-fouling ability.

[0027] At the same time, the synergistic effect of nano-titanium dioxide and inorganic salts such as sodium hexametaphosphate and sodium aminosulfonate and other active ingredients, such as sodium-based calcium hypochlorite and potassium monopersulfate, sodium hexametaphosphate and sodium aminosulfate can adjust the chemical environment of the aqueous solution, such as pH value, ionic strength, etc., which is conducive to the photocatalytic effect of nano-titanium dioxide, and the bactericidal and disinfecting effects produced by other active ingredients can cooperate with the antibacterial and antifouling effects of nano-titanium dioxide to jointly inhibit the growth of microorganisms and the attachment of pollutants, and improve the antibacterial and antifouling properties of the entire composition. Specifically, the hypochlorous acid (HClO) produced by the decomposition of sodium-based calcium hypochlorite can destroy the cell wall and cell membrane of microorganisms, making it easier for nano-titanium dioxide to enter the interior of the microorganism to play a photocatalytic role; the active oxygen released by potassium monopersulfate can cooperate with the active oxygen species produced by nano-titanium dioxide to oxidize organic pollutants and enhance the antifouling effect.

[0028] (f) a balance auxiliary agent, wherein the auxiliary agent is zwitterionic polyacrylamide, and the molecular weight thereof is 8-20 million, and the ionicity is 5-50%, and the zwitterionic polyacrylamide is treated with ultraviolet radiation, and the irradiation dose is 50-200 kGy, and the ultraviolet radiation treatment is used to introduce oxygen-containing functional groups, and the oxygen-containing functional groups are used to increase the polarity and active sites of the molecule.

[0029] The energy of ultraviolet rays can cause zwitterionic polyacrylamide molecules to react. When ultraviolet rays irradiate zwitterionic polyacrylamide, its photons have a certain amount of energy, which may cause certain chemical bonds in the molecular chain to absorb this energy and break or reorganize.

[0030] Specifically, it leads to the generation of oxygen-containing functional groups on the molecular chain. Zwitterionic polyacrylamide itself has cationic groups and anionic groups. The introduced oxygen-containing functional groups increase the polarity and active sites of the molecule, which can enhance its interaction with the reaction residues. The cationic groups can interact with negatively charged substances to form flocculent precipitates, achieving water purification. The oxygen-containing functional groups further enhance this interaction and enhance the adsorption capacity of the reaction residues. At the same time, the oxygen-containing functional groups also help to enhance the hydrogen bonding between molecules, promote the formation and stability of flocs, and thus improve the flocculation effect.

[0031] Preferably, the pretreatment method of modified sodium-based calcium hypochlorite comprises: reacting sodium-based calcium hypochlorite with rare earth metal oxides under high temperature and high pressure conditions, the reaction temperature is 150-250° C., the pressure is 2-5 MPa, and the reaction time is 2-6 hours; after the reaction, cooling, crushing, and screening are performed to obtain modified sodium-based calcium hypochlorite.

[0032] Preferably, the average particle size of the nano titanium dioxide is 10-50 nm.

[0033] Preferably, oxygen-containing functional groups are introduced into the molecular chain of the zwitterionic polyacrylamide after ultraviolet irradiation treatment, and the oxygen-containing functional groups are selected from at least one of hydroxyl, carbonyl and carboxyl.

[0034] A method for preparing the sterilization and disinfection composition as described above comprises the following steps:

[0035] Step 1: Weigh each component according to weight percentage, and place sodium-process calcium hypochlorite, potassium dihydrogen phosphate, potassium monopersulfate, aluminum sulfate, inorganic salt and additives in a reaction kettle equipped with a stirring device and a temperature control system;

[0036] Step 2: heating to 30-50°C at a stirring speed of 50-200 rpm, and stirring and mixing at this temperature for 30-90 minutes to obtain a uniform mixture;

[0037] Step 3: Dry the mixture obtained in step 2 at a drying temperature of 50-80° C. for 2-6 hours, and grind and sieve the mixture after drying to obtain a sterilization and disinfection composition in the desired dosage form.

[0038] The use of supersonic air flow pulverizing technology and multi-layer vibration screening equipment can improve the particle size distribution and uniformity of the sterilization and disinfection composition, thereby improving product quality and performance.

[0039] Preferably, the pulverization in step three adopts supersonic airflow pulverization technology, and the particle size distribution of the pulverized particles is 10-100 microns.

[0040] Preferably, the screening in step three adopts a multi-layer vibration screening equipment, and the screen apertures are 10 mesh, 30 mesh, 50 mesh, and 100 mesh, respectively, to ensure the uniformity of the product particle size.

[0041] Technical effects and advantages of the present invention:

[0042] 1. By compounding sodium-based calcium hypochlorite with rare earth metal oxides, the outer 4f electrons of rare earth element atoms form coordination bonds or weak chemical bonds with the oxygen atoms in the hypochlorite ions, stabilizing the hypochlorite ions and reducing their decomposition during storage and use, thereby improving the stability of sodium-based calcium hypochlorite and significantly improving the stability and bactericidal effect of sodium-based calcium hypochlorite in complex water quality environments.

[0043] 2. Rare earth metal oxides have oxidizing and catalytic activity, which can promote potassium monopersulfate to release more active oxygen components and synergize with hypochlorous acid produced by the decomposition of sodium calcium hypochlorite, thereby enhancing the oxidative damage to microbial cell walls, cell membranes and internal biological macromolecules, and improving the bactericidal effect. At the same time, rare earth elements are used to adjust the pH value and redox potential of the solution to create a chemical environment that is more conducive to sterilization, accelerate the imbalance of redox reactions in microbial cells, and lead to microbial death.

[0044] 3. Nano-titanium dioxide generates electron-hole pairs under ultraviolet irradiation, which in turn generate active oxygen species such as hydroxyl free radicals and superoxide anion free radicals, which attack the biomacromolecules in microbial cells, destroy their structure and function, and achieve antibacterial effect. At the same time, active oxygen species can decompose organic pollutants adsorbed on the surface of objects, achieve surface self-cleaning, and enhance anti-fouling ability.

[0045] 4. The surface modification of nano-titanium dioxide by silane coupling agent or titanate coupling agent improves its dispersibility in the composition, increases the contact opportunities with microorganisms and other active ingredients, and improves the antibacterial efficiency. It can also adjust the surface charge properties of nano-titanium dioxide and promote its interaction with microorganisms. It can also change its surface hydrophilicity, prevent the attachment of organic pollutants and microorganisms, and improve the anti-fouling ability. Nano-titanium dioxide synergizes with inorganic salts such as sodium hexametaphosphate and sodium aminosulfonate and other active ingredients to adjust the chemical environment of the aqueous solution, which is conducive to the photocatalytic effect of nano-titanium dioxide. The bactericidal and disinfecting effects of other active ingredients cooperate with the antibacterial and anti-fouling effects of nano-titanium dioxide to jointly inhibit the growth of microorganisms and the attachment of pollutants, and improve the overall antibacterial and anti-fouling performance.

[0046] 5. By introducing oxygen-containing functional groups into zwitterionic polyacrylamide through ultraviolet irradiation treatment, the molecular polarity and active sites are increased, the interaction with reaction residues is enhanced, and the adsorption capacity for reaction residues is improved. At the same time, it helps to enhance the intermolecular hydrogen bonding effect, promote the formation and stabilization of flocs, achieve water purification, and improve the flocculation effect. DETAILED DESCRIPTION

[0047] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0048] Example 1

[0049] Raw material preparation

[0050] Weigh 60% of modified sodium calcium hypochlorite, react sodium calcium hypochlorite with lanthanum oxide at 150°C and 2MPa for 2 hours, with a lanthanum oxide content of 0.5%, cool, crush and sieve after the reaction to obtain

[0051] 13% potassium dihydrogen phosphate.

[0052] 5% potassium monopersulfate (active oxygen content ≥ 4%).

[0053] 2% aluminum sulfate.

[0054] 2% of inorganic salt, sodium hexametaphosphate and sodium aminosulfonate in a mass ratio of 3:1, and 0.1% of the total mass of nano titanium dioxide with an average particle size of 10nm is added, and the surface of the nano titanium dioxide is modified by a silane coupling agent.

[0055] The auxiliary agent is zwitterionic polyacrylamide, with a molecular weight of 8 million and an ionicity of 5%. After being irradiated with 50 kGy ultraviolet rays, hydroxyl functional groups are introduced into the molecular chain, and the balance is zwitterionic polyacrylamide.

[0056] Preparation process

[0057] The above raw materials are placed in a reaction kettle equipped with a stirring device and a temperature control system.

[0058] The mixture was heated to 30° C. and stirred for 90 minutes at a stirring speed of 50 rpm to obtain a uniform mixture.

[0059] The mixture was dried at 50°C for 6 hours, then crushed by supersonic airflow crushing technology, the particle size distribution was 10-100 microns, and finally sieved by multi-layer vibration screening equipment, the sieve apertures were 10 mesh, 30 mesh, 50 mesh, and 100 mesh, respectively, to obtain a sterilization and disinfection composition.

[0060] Example 2

[0061] Raw material preparation

[0062] 70% of modified sodium-based calcium hypochlorite was weighed, and the sodium-based calcium hypochlorite was reacted with cerium oxide at 200° C. and 3.5 MPa for 4 hours, with the cerium oxide content being 1.5%. After the reaction, the mixture was cooled, crushed, and sieved to obtain the product.

[0063] 11.5% potassium dihydrogen phosphate.

[0064] 4% potassium monopersulfate.

[0065] 1.5% aluminum sulfate.

[0066] 1.5% of inorganic salt, sodium hexametaphosphate and sodium aminosulfonate in a mass ratio of 4:1, 0.3% of the total mass of nano titanium dioxide with an average particle size of 30nm is added, and the surface is modified by a titanate coupling agent.

[0067] The auxiliary agent is zwitterionic polyacrylamide, with a molecular weight of 14 million and an ionicity of 30%. After being irradiated with 120 kGy ultraviolet rays, carbonyl functional groups are introduced into the molecular chain, and the remainder is zwitterionic polyacrylamide.

[0068] Preparation process

[0069] The raw materials were placed in a reaction kettle, heated to 40° C. at a stirring speed of 120 rpm, and stirred for 60 minutes.

[0070] The mixture was dried at 60°C for 4 hours, and then crushed by supersonic airflow crushing technology, with the particle size distribution ranging from 10 to 100 microns. Finally, the mixture was sieved by multi-layer vibration screening equipment, with the mesh sizes being 10 mesh, 30 mesh, 50 mesh, and 100 mesh, respectively, to obtain a sterilization and disinfection composition.

[0071] Example 3

[0072] Raw material preparation

[0073] 75% of modified sodium-based calcium hypochlorite was weighed, and the sodium-based calcium hypochlorite was reacted with yttrium oxide at 220° C. and 4 MPa for 5 hours, with the yttrium oxide content being 2%. After the reaction, the mixture was cooled, crushed, and sieved to obtain the product.

[0074] 10% potassium dihydrogen phosphate.

[0075] 3.5% potassium monopersulfate.

[0076] 1.2% aluminum sulfate.

[0077] 1.8% of inorganic salt, sodium hexametaphosphate and sodium aminosulfonate in a mass ratio of 5:1, 0.4% of the total mass of nano titanium dioxide with an average particle size of 40nm is added, and the surface is modified by a silane coupling agent and a titanate coupling agent.

[0078] The auxiliary agent is zwitterionic polyacrylamide, with a molecular weight of 16 million and an ionicity of 40%. After being irradiated with 160 kGy ultraviolet rays, carboxyl functional groups are introduced into the molecular chain, and the balance is zwitterionic polyacrylamide.

[0079] Preparation process

[0080] The raw materials were put into a reaction kettle, stirred at a speed of 160 rpm, heated to 45°C, and stirred and mixed for 45 minutes.

[0081] The mixture was dried at 70°C for 3 hours, and then crushed by supersonic airflow crushing technology, with the particle size distribution ranging from 10 to 100 microns. Finally, the mixture was sieved by multi-layer vibration screening equipment, with the sieve apertures being 10 mesh, 30 mesh, 50 mesh, and 100 mesh, to obtain a sterilization and disinfection composition.

[0082] Example 4

[0083] Raw material preparation

[0084] Weigh 80% of modified sodium calcium hypochlorite, sodium calcium hypochlorite, lanthanum oxide and cerium oxide in a mass ratio of 1:1, react at 250°C and 5MPa for 6 hours, the total content of rare earth metal oxides is 3%, and cool, crush and sieve after the reaction to obtain the product.

[0085] 10% potassium dihydrogen phosphate.

[0086] 3% potassium monopersulfate.

[0087] 1% aluminum sulfate.

[0088] 1% inorganic salt, sodium hexametaphosphate and sodium aminosulfonate in a mass ratio of 5:1, 0.5% of the total mass of nano titanium dioxide with an average particle size of 50nm is added, and the surface is modified by a silane coupling agent.

[0089] The auxiliary agent is zwitterionic polyacrylamide, with a molecular weight of 20 million and an ionicity of 50%. After being irradiated with 200 kGy ultraviolet rays, hydroxyl and carboxyl functional groups are introduced into the molecular chain, and the balance is zwitterionic polyacrylamide.

[0090] Preparation process

[0091] The raw materials were placed in a reaction kettle, stirred at a speed of 200 rpm, heated to 50° C., and stirred for 30 minutes.

[0092] The mixture was dried at 80°C for 2 hours, and then crushed by supersonic airflow crushing technology, with the particle size distribution ranging from 10 to 100 microns. Finally, the mixture was sieved by multi-layer vibration screening equipment, with the sieve apertures being 10 mesh, 30 mesh, 50 mesh, and 100 mesh, respectively, to obtain a sterilization and disinfection composition.

[0093] Example 5

[0094] Raw material preparation

[0095] Weigh 65% of modified sodium calcium hypochlorite, sodium calcium hypochlorite, cerium oxide and yttrium oxide in a mass ratio of 2:1, react at 180° C. and 3 MPa for 3 hours, and the total content of rare earth metal oxides is 1%. After the reaction, cool, crush and sieve to obtain the product.

[0096] 12% potassium dihydrogen phosphate.

[0097] 4.5% potassium monopersulfate.

[0098] 1.8% aluminum sulfate.

[0099] 1.2% of inorganic salt, sodium hexametaphosphate and sodium aminosulfonate in a mass ratio of 4:1, 0.2% of the total mass of nano titanium dioxide with an average particle size of 20nm is added, and the surface is modified by a titanate coupling agent.

[0100] The auxiliary agent is zwitterionic polyacrylamide, with a molecular weight of 10 million and an ionicity of 20%. After being irradiated with 80 kGy ultraviolet rays, carbonyl functional groups are introduced into the molecular chain, and the balance is zwitterionic polyacrylamide.

[0101] Preparation process

[0102] The raw materials were added into the reaction kettle, stirred at 80 rpm, heated to 35°C, and stirred for 75 minutes.

[0103] The mixture was dried at 65°C for 5 hours, and then crushed by supersonic airflow crushing technology, with the particle size distribution ranging from 10 to 100 microns. Finally, the mixture was sieved by multi-layer vibration screening equipment, with the sieve apertures being 10 mesh, 30 mesh, 50 mesh, and 100 mesh, respectively, to obtain a sterilization and disinfection composition.

[0104] Water quality impact test

[0105] Experimental preparation

[0106] 10 g of each of the sterilization and disinfection compositions prepared in Examples 1-5 were taken and dissolved in 1 L of pure water to prepare test solutions. At the same time, 1 L of pure water without any sterilization and disinfection composition was prepared as a blank control.

[0107] Prepare testing instruments, such as pH meter, conductivity meter, and chemical oxygen demand (COD) meter, to detect water quality related indicators.

[0108] Index detection

[0109] Initial detection: After the test solution is prepared, use a pH meter, conductivity meter and COD meter to detect the pH value, conductivity and COD value of each test solution and the blank control, and record the initial data.

[0110] Testing at different times: Place the prepared test solutions and blank controls at room temperature (25°C), and use the above instruments to test the pH value, conductivity and COD value of each solution again after 24 hours, 48 ​​hours and 72 hours.

[0111] Microbiological index detection

[0112] Take an appropriate amount of test solution and blank control, and use the plate count method to detect the total number of bacteria, E. coli count and other microbial indicators. Perform the test at the beginning of the test, 24 hours, 48 ​​hours, and 72 hours, and record the data.

[0113] The test results are shown in Table 1.

[0114] Table 1

[0115]

[0116]

[0117]

[0118] Water quality impact test results

[0119] pH Changes

[0120] The pH values ​​of the test solutions of Examples 1-5 changed slightly at the beginning, but they were all within a reasonable range. For example, the initial pH value of Example 1 was 7.2, and that of Example 2 was 7.3. After 24 hours, 48 ​​hours, and 72 hours, the pH value changed slightly and remained basically stable, with little difference compared to the blank control. This indicates that the sterilization and disinfection composition has little effect on the pH value of water and will not cause a large fluctuation in the pH value of water.

[0121] Conductivity changes

[0122] The conductivity of the test solution of each example increased at the beginning, which was due to the dissolution of the ion components in the composition. For example, the initial conductivity of Example 3 was 150 μS / cm, which was higher than the 5 μS / cm of the blank control. As time went on, the conductivity did not change significantly after 24 hours, 48 ​​hours, and 72 hours, indicating that the ion concentration in the solution did not change significantly, and the components in the composition were relatively stable after dissolving in water, without continuous release or reaction to produce a large number of new ions.

[0123] COD value changes

[0124] At the beginning of the test, the COD value of the test solution of each embodiment was close to that of the blank control, for example, the COD value of the blank control was 10 mg / L, and the initial COD value of Example 3 was 12 mg / L. After 24 hours, 48 ​​hours, and 72 hours, the COD value increased slightly, but the increase was small. For example, the COD value of Example 4 was 15 mg / L after 72 hours, indicating that the sterilization and disinfection composition does not cause a substantial increase in the content of organic matter in water, and has little effect on the chemical oxygen demand of water quality.

[0125] Changes in microbial indicators

[0126] Initially, the total bacteria count and the number of E. coli in each test solution and the blank control were at a certain level, the total bacteria count of the blank control was 1000CFU / mL, and the number of E. coli was 100MPN / 100mL. After 24 hours, the total bacteria count and the number of E. coli in the test solutions of Examples 1-5 were significantly reduced, such as in Example 2, the total bacteria count was reduced to 20CFU / mL, and the number of E. coli was reduced to below 15MPN / 100mL. After 48 hours, no bacteria and E. coli were detected, and the number of microorganisms in the blank control did not change much. This shows that the sterilization and disinfection composition has a good bactericidal effect, can effectively inhibit the growth and reproduction of microorganisms in water, and will not cause adverse effects on water quality during the sterilization process.

[0127] In summary, the sterilization and disinfection compositions prepared in Examples 1-5 performed well in the water quality impact test, had little impact on various water quality indicators, and had significant bactericidal effects, meeting the requirements of environmental protection and disinfection.

[0128] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An environmentally friendly sterilization and disinfection composition, characterized in that: In terms of weight percentage, it includes: (a) 60-80% sodium-based calcium hypochlorite, wherein the sodium-based calcium hypochlorite is a pretreated modified sodium-based calcium hypochlorite, wherein the modified sodium-based calcium hypochlorite is compounded with a specific rare earth metal oxide, wherein the rare earth metal oxide is selected from at least one of lanthanum oxide, cerium oxide, and yttrium oxide, and the content of the rare earth metal oxide in the modified sodium-based calcium hypochlorite is 0.5-3%, and the outer 4f electrons of the rare earth element atoms in the rare earth metal oxide form coordination bonds or weak chemical bonds with the oxygen atoms in the hypochlorite ions to form stable hypochlorite ions, which are used to improve the stability of the sodium-based calcium hypochlorite; (b) 10-13% potassium dihydrogen phosphate; (c) 3-5% potassium monopersulfate, wherein the active oxygen content of the potassium monopersulfate is ≥ 4%; (d) 1-2% aluminum sulfate; (e) 1-2% of an inorganic salt, wherein the inorganic salt is a mixture of sodium hexametaphosphate and sodium sulfamate in a mass ratio of (3-5):1, and the inorganic salt is further added with 0.1-0.5% of nano-titanium dioxide, which is surface-modified by a modifier selected from at least one of a silane coupling agent and a titanate coupling agent, and the addition of the nano-titanium dioxide is used to enhance the antibacterial and anti-fouling properties; (f) a balance auxiliary agent, wherein the auxiliary agent is zwitterionic polyacrylamide, and the molecular weight thereof is 8-20 million, and the ionicity is 5-50%, and the zwitterionic polyacrylamide is treated with ultraviolet radiation, and the irradiation dose is 50-200 kGy, and the ultraviolet radiation treatment is used to introduce oxygen-containing functional groups, and the oxygen-containing functional groups are used to increase the polarity and active sites of the molecule.

2. An environmentally friendly sterilization and disinfection composition according to claim 1, characterized in that: The pretreatment method of modified sodium-based calcium hypochlorite comprises: reacting sodium-based calcium hypochlorite with rare earth metal oxide under high temperature and high pressure conditions, wherein the reaction temperature is 150-250° C., the pressure is 2-5 MPa, and the reaction time is 2-6 hours; and after the reaction, cooling, crushing, and screening are performed to obtain modified sodium-based calcium hypochlorite.

3. An environmentally friendly sterilization and disinfection composition according to claim 1, characterized in that: The average particle size of the nano titanium dioxide is 10-50 nm.

4. An environmentally friendly sterilization and disinfection composition according to claim 1, characterized in that: An oxygen-containing functional group is introduced into the molecular chain of the zwitterionic polyacrylamide after ultraviolet irradiation treatment, and the oxygen-containing functional group is selected from at least one of a hydroxyl group, a carbonyl group and a carboxyl group.

5. A method for preparing the environmentally friendly sterilization and disinfection composition according to any one of claims 1 to 4, characterized in that: The following steps are involved: Step 1: Weigh each component according to weight percentage, and place sodium-process calcium hypochlorite, potassium dihydrogen phosphate, potassium monopersulfate, aluminum sulfate, inorganic salt and additives in a reaction kettle equipped with a stirring device and a temperature control system; Step 2: Raise the temperature to 30-50°C at a stirring speed of 50-200 rpm, and stir and mix at this temperature for 30-90 minutes to obtain a uniform mixture; Step 3: Dry the mixture obtained in step 2 at a drying temperature of 50-80° C. for 2-6 hours, and grind and sieve the mixture after drying to obtain a sterilization and disinfection composition in the desired dosage form.

6. The method for preparing the environmentally friendly sterilization and disinfection composition according to claim 5, characterized in that: The pulverization in step three adopts supersonic airflow pulverization technology, and the particle size distribution of the pulverized particles is 10-100 microns.

7. The method for preparing the environmentally friendly sterilization and disinfection composition according to claim 5, characterized in that: The screening in step three adopts a multi-layer vibration screening equipment, and the screen apertures are 10 mesh, 30 mesh, 50 mesh, and 100 mesh respectively.

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