Composition for improving stability and activity of sodium percarbonate, preparation method and application

Abstract

The invention discloses a composition for improving the stability and activity of sodium percarbonate, a preparation method and application, and belongs to the technical field of peroxide.The composition remarkably improves the stability and activity of sodium percarbonate by optimizing reaction conditions and a spraying and drying process. The specific preparation method comprises the following steps: mixing sodium carbonate decahydrate and mother liquor, heating, adding a solution of a crystallization aid and a stabilizer, reacting, and finally spraying and drying to obtain the product. Compared with the prior art, the composition prepared by the invention obviously enhances the thermal stability and the wet stability of sodium percarbonate, shows excellent performance in the fields of detergents, bleaching agents and disinfectants, and has wide application prospects and market values.

Description

Technical Field

[0001] The present invention relates to the technical field of peroxides, and particularly to a composition for improving the stability and activity of sodium percarbonate, a preparation method and an application thereof. Background Art

[0002] Sodium percarbonate is an important inorganic peroxide with the chemical formula 2Na 2 CO 3 ·3H 2 O 2 and a relative molecular mass of 314.0. It has functions such as bleaching, sterilizing, degreasing and washing, and is widely used in daily chemical products such as detergents, color bleach washing powders, toothpastes, cosmetics, etc. However, sodium percarbonate has unstable chemical properties, is prone to moisture absorption and decomposition, and releases active oxygen, resulting in loss of effective components. Therefore, stabilizers and auxiliaries are usually added during the production process to improve its stability.

[0003] Currently, the production of sodium percarbonate mainly adopts two processes: wet process and dry process. The wet process is to react sodium carbonate with hydrogen peroxide to produce sodium percarbonate, and stabilizers and auxiliaries are often added during the process to improve product quality. Traditional stabilizers are mostly phosphorus-containing formulations, such as phosphates and their mixtures, organic phosphine auxiliaries, etc. Although these substances can improve the stability of sodium percarbonate, the phosphorus-containing formulations are prone to cause eutrophication of water bodies and pollute the environment. Therefore, the development of phosphorus-free stabilizers has become a research hotspot.

[0004] Chinese Patent CN101391754A discloses a stabilizer for preparing phosphorus-free sodium percarbonate, which is composed of the following components: silicate, copolymer of carboxylic acid and sulfonate, inorganic magnesium salt, sodium polyacrylate, organic alkanolamine and disodium ethylenediaminetetraacetate. The usage method of this stabilizer is to add silicate, copolymer of carboxylic acid and sulfonate, and inorganic magnesium salt to the sodium carbonate raw material, while sodium polyacrylate, organic alkanolamine and disodium ethylenediaminetetraacetate are added to the hydrogen peroxide raw material. The sodium percarbonate product prepared by using this stabilizer has uniform particles, controllable particle size, an active oxygen content exceeding 13.8%, a bulk density exceeding 900 g / L, a thermal stability exceeding 85%, and a wet stability exceeding 55%. This stabilizer does not contain phosphorus elements, can completely replace traditional phosphorus-containing formulations, reduce production costs, and at the same time reduce environmental pollution.

[0005] However, although this stabilizer performs excellently in reducing environmental pollution, in practical applications, there is still room for improvement in its stabilizing ability and cleaning and washing effects. For example, sodium percarbonate is prone to decomposition when exposed to high temperatures, water, or heavy metal ions, resulting in a decrease in the stability of active oxygen. In addition, a small amount of moisture or trace amounts of heavy metal ions such as iron, copper, and cobalt will accelerate its decomposition and affect its application performance in complex environments. Therefore, developing a sodium percarbonate stabilizer with higher stability, better active oxygen retention ability, and better cleaning and washing effects is of great significance for enhancing the market competitiveness and application scope of sodium percarbonate products. Summary of the Invention

[0006] In order to solve the deficiencies in the prior art, the present invention aims to provide a sodium percarbonate stabilizer with higher stability, better active oxygen retention ability, and better cleaning and washing effects.

[0007] In order to achieve the above-mentioned invention objectives, the present invention adopts the following technical solutions: A method for preparing a composition for improving the stability and activity of sodium percarbonate is as follows, in parts by weight: Step 1: Put 1 - 2 parts of sodium carbonate decahydrate and 0.5 - 2 parts of mother liquor into a slurry tank, heat to 25 - 35°C and treat for 1 - 3 hours to obtain reaction solution A; in 0.5 - 2 parts of hydrogen peroxide solution with a mass concentration of 25% - 35%, add 0.006 - 0.016 parts of crystallization aid A, stir until completely dissolved, and then cool to 3 - 8°C to obtain reaction solution B; in 0.5 - 2 parts of water, add 0.05 - 0.2 parts of crystallization aid B and 0.03 - 0.08 parts of stabilizer, stir until completely dissolved to obtain reaction solution C; Step 2: Add 1 - 3 parts of mother liquor as the bottom liquid to a reaction kettle, control the reaction temperature at 15 - 25°C, add reaction solution A, reaction solution B, and reaction solution C to the reaction kettle respectively, the reaction time is 10 - 50 minutes, after the reaction ends, maintain stirring at 800 - 1200 rpm for 3 - 8 minutes, and then immediately send it into a spray drying tower for spray drying to obtain the final composition.

[0008] The preparation method of the stabilizer is as follows, in parts by weight: First, mix 100 - 150 parts of inorganic materials and 20 - 40 parts of functional agents, then add 1000 - 1500 parts of absolute ethanol, 5 - 10 parts of silane coupling agent, and 2 - 6 parts of aluminum phosphate, mix and stir by ultrasonic, and then treat at 60 - 70°C for 30 - 50 minutes to obtain the stabilizer.

[0009] The temperature in the spray drying tower is 150 - 170°C, the vacuum degree is 15 - 25 kPa, and the residence time is 10 - 30 minutes.

[0010] The ultrasonic mixing and stirring is carried out for 20 to 50 minutes, the ultrasonic power is 200 to 400 W, and the ultrasonic frequency is 20 to 60 kHz.

[0011] The mother liquor contains 6 wt% to 8 wt% sodium carbonate, 0.5 wt% to 1 wt% hydrogen peroxide, 14 wt% to 28 wt% sodium sulfate, and the balance is water.

[0012] The crystallization aid A is at least one of ethylenediaminetetraacetic acid, aminotrimethylenephosphonic acid, hydroxyethylidene diphosphonic acid, sodium citrate, sodium polyacrylate, and diethylenetriamine pentamethylenephosphonic acid.

[0013] The crystallization aid B is at least one of sodium pyrophosphate, sodium tripolyphosphate, sodium hexametaphosphate, trisodium phosphate, disodium hydrogen phosphate, ammonium pyrophosphate, ethylenediaminetetramethylenephosphonic acid, and hydrolyzed polymaleic anhydride.

[0014] The inorganic material includes at least one of graphene, nano zinc oxide, and fumed silica.

[0015] The functional agent is at least one of polyaniline, nano boron nitride, and carbon nanotubes.

[0016] The silane coupling agent is at least one of N-3-(triethoxysilyl)propyl-N-3-(trimethoxysilyl)propylurea, 3-[tris(hexyloxy)silyl]propylamine, N-[3-[tris(octyloxy)silyl]propyl]ethylenediamine, and N-(2-aminoethyl)-3-aminopropyltrimethoxysilane.

[0017] The composition for improving the stability and activity of sodium percarbonate is applied to the fields of detergents, bleaching agents, and disinfectants.

[0018] The creativity of the present invention lies in the development of an innovative sodium percarbonate stabilizer and its preparation method. In the preparation method of the stabilizer, the stabilizer prepared from inorganic materials, functional agents, absolute ethanol, silane coupling agents, and aluminum phosphate improves the stability performance of the composition and the washing effect on clothes. Particularly, the inorganic material is fumed silica, the functional agent is polyaniline, and the silane coupling agent is N-3-(triethoxysilyl)propyl-N-3-(trimethoxysilyl)propylurea, with the best stability performance and washing effect. Fumed silica, by virtue of its high specific surface area and abundant surface hydroxyl groups, undergoes chemical bonding with N-3-(triethoxysilyl)propyl-N-3-(trimethoxysilyl)propylurea to form a coated network structure, effectively isolating moisture and heavy metal ions; polyaniline, due to its good conductivity and chemical stability, forms a uniform coating layer on the surface of sodium percarbonate, further blocking the decomposition factors. This significantly enhances the stability and activity of sodium percarbonate, enabling it to maintain high efficiency in complex environments. At the same time, the optimized spray drying process further improves the dispersibility and particle uniformity of the product. This innovative combination and process optimization not only break through the bottleneck of the existing technology but also expand the application scope of sodium percarbonate in the fields of detergents, bleaching agents, disinfectants, etc., with significant market value and innovation.

[0019] In the present invention, the functions of each substance are as follows: Sodium carbonate decahydrate, as the main raw material of sodium percarbonate, provides carbonate ions , which reacts with hydrogen peroxide to generate sodium percarbonate.

[0020] The mother liquor provides a reaction medium, adjusts the pH value and ionic strength of the reaction system, and at the same time acts as a solvent to help dissolve sodium carbonate decahydrate.

[0021] Sodium sulfate, as an electrolyte, adjusts the ionic strength of the reaction system, improves the stability of the reaction, and prevents the decomposition of sodium percarbonate.

[0022] Sodium polyacrylate, as a crystallization aid, can adjust the crystallization process of sodium percarbonate, improving the particle size uniformity and particle strength of the product.

[0023] Diethylenetriamine pentamethylenephosphonic acid, as a crystallization aid, can chelate trace metal ions (such as iron, copper, manganese, etc.), prevent the decomposition of sodium percarbonate, and improve the stability of the product.

[0024] Sodium phosphate, as a crystallization aid, can adjust the crystallization process of sodium percarbonate, improving the particle size uniformity and particle strength of the product.

[0025] The stabilizer, through the coating effect, isolates moisture and heavy metal ions, significantly improving the thermal stability and wet stability of sodium percarbonate.

[0026] Fumed silica provides a high specific surface area and abundant surface hydroxyl groups, which can undergo chemical bonding with silane coupling agents to form a stable network structure, enhancing the coating effect of sodium percarbonate.

[0027] Polyaniline has good electrical conductivity and chemical stability, and can form a uniform coating layer on the surface of sodium percarbonate, effectively isolating moisture and heavy metal ions, and improving the thermal stability and wet stability of sodium percarbonate.

[0028] N-3-(triethoxysilyl)propyl-N-3-(trimethoxysilyl)propylurea, as a silane coupling agent, can undergo chemical bonding with fumed silica, etc., to form a stable network structure, further enhancing the coating effect of sodium percarbonate.

[0029] Aluminum phosphate enhances the structural stability of the stabilizer.

[0030] Anhydrous ethanol, as a solvent, helps the components of the stabilizer to be evenly dispersed and promotes the progress of chemical reactions.

[0031] The spray drying tower quickly dries the reaction product through the spray drying process to form a sodium percarbonate product with uniform particles, improving the dispersibility and application performance of the product.

[0032] Through their synergistic effects, these substances significantly improve the stability and activity of sodium percarbonate, making it exhibit excellent performance in the fields of detergents, bleaching agents, and disinfectants.

[0033] Compared with the prior art, it has the following beneficial effects: 1) The stabilizer prepared by the present invention using materials such as fumed silica and polyaniline and a specific silane coupling agent (such as N-3-(triethoxysilyl)propyl-N-3-(trimethoxysilyl)propylurea) effectively isolates decomposition factors such as moisture and heavy metal ions, significantly enhancing the thermal stability and wet stability of sodium percarbonate, and enabling it to maintain a high active oxygen content in high-temperature and humid environments.

[0034] 2) By optimizing the reaction conditions (such as temperature, stirring speed, reaction time) and the spray drying process, the present invention further improves the dispersibility and particle uniformity of sodium percarbonate. This optimized process not only improves the product quality but also reduces the production cost and increases the production efficiency.

[0035] 3) The sodium percarbonate composition prepared by the present invention exhibits excellent performance in multiple fields such as detergents, bleaching agents, and disinfectants, and has broad application prospects and market value. Specific Embodiments

[0036] Main sources of substances: Fumed silica, specification: DM-20S, product specification: 12nm, manufacturer (origin): Tokuyama, Japan.

[0037] Polyaniline, article number: PA05600, Guangdong Wengjiang Chemical Reagent Co., Ltd.

[0038] Sodium polyacrylate, article number: 391, Jiangsu Caiwei Biotechnology Co., Ltd.

[0039] Nanometer boron nitride, article number: PT-BN-100nm, particle size: 100nm, specific surface area: 19m 2 / g, Shanghai Pantian Powder Materials Co., Ltd.

[0040] Nanometer zinc oxide, model: KND-XR30, particle size: 30 - 50nm, Changzhou Konada New Materials Technology Co., Ltd.

[0041] Graphene, article number: NO-C-066-2, diameter < 10um, specific surface: 300 - 350m 2 / g, Shanghai Naiou Nanotechnology Co., Ltd.

[0042] Carbon nanotubes, model: KR-30A, fineness: 8 - 15nm, Core Nano (Guangdong) Co., Ltd.

[0043] Hydrolyzed polymaleic anhydride, article number: HPMA, Dezhou Chengqi Chemical Co., Ltd.

[0044] The remaining raw materials in the examples and comparative examples of the present invention are all commercially available products.

[0045] The design idea of the present invention is to improve the stability and activity of sodium percarbonate by preparing a special stabilizer. The stabilizer is composed of inorganic materials such as fumed silica and polyaniline and an organosilane coupling agent (such as N-3-(triethoxysilyl)propyl-N-3-(trimethoxysilyl)propylurea). By using its coating effect, it effectively isolates the contact between sodium percarbonate and decomposition factors such as moisture and heavy metal ions, and at the same time enhances its thermal stability and wet stability. In addition, by optimizing the reaction conditions and spray drying process, the dispersibility and application performance of sodium percarbonate are further improved, making it show excellent performance in the fields of detergents, bleaching agents, and disinfectants.

[0046] Example 1

[0047] A preparation method of a composition for improving the stability and activity of sodium percarbonate is as follows: Step 1: Put 1.5 kg of sodium carbonate decahydrate and 1 kg of mother liquor into the slurry tank. The mother liquor contains 6 wt% sodium carbonate, 0.8 wt% hydrogen peroxide, 20 wt% sodium sulfate, and the balance is water. Heat it to 30 °C and treat for 2 hours to obtain reaction liquid A; in 1 kg of hydrogen peroxide solution with a mass concentration of 35%, add 5 g of sodium polyacrylate and 5 g of diethylenetriamine pentamethylenephosphonic acid, stir until completely dissolved, and then cool to 5 °C to obtain reaction liquid B; in 1 kg of water, add 100 g of trisodium phosphate and 50 g of stabilizer, stir until completely dissolved, and obtain reaction liquid C. Step 2: Add 2 kg of mother liquor as the bottom liquid to the reaction kettle. The mother liquor contains 6 wt% sodium carbonate, 0.8 wt% hydrogen peroxide, 20 wt% sodium sulfate, and the balance is water. Control the reaction temperature at 20 °C, and add reaction liquid A, reaction liquid B, and reaction liquid C to the reaction kettle respectively. The reaction time is 30 minutes. After the reaction is completed, stir at 1000 rpm for 5 minutes, and then immediately send it into the spray drying tower for spray drying. The temperature in the spray drying tower is 160 °C, the vacuum degree is 20 kPa, and the residence time is 20 minutes to obtain the final composition.

[0048] The preparation method of the stabilizer is as follows: First, mix 120 g of fumed silica and 30 g of polyaniline, then add 1200 g of absolute ethanol, 8 g of N-3-(triethoxysilyl)propyl-N-3-(trimethoxysilyl)propylurea, and 4 g of aluminum phosphate and mix them. Stir ultrasonically for 40 minutes, the ultrasonic power is 300 W, and the ultrasonic frequency is 40 kHz. Then treat at 65 °C for 45 minutes to obtain the stabilizer.

[0049] Example 2

[0050] A preparation method of a composition for improving the stability and activity of sodium percarbonate is as follows: Step 1: Put 1.5 kg of sodium carbonate decahydrate and 1 kg of mother liquor into the slurry tank. The mother liquor contains 6 wt% sodium carbonate, 0.8 wt% hydrogen peroxide, 20 wt% sodium sulfate, and the balance is water. Heat it to 30 °C and treat for 2 hours to obtain reaction liquid A; in 1 kg of hydrogen peroxide solution with a mass concentration of 35%, add 5 g of sodium polyacrylate and 5 g of diethylenetriamine pentamethylenephosphonic acid, stir until completely dissolved, and then cool to 5 °C to obtain reaction liquid B; in 1 kg of water, add 100 g of hydrolyzed polymaleic anhydride and 50 g of stabilizer, stir until completely dissolved, and obtain reaction liquid C. Step 2: Add 2 kg of mother liquor as the bottom liquid into the reactor. The mother liquor contains 6 wt% sodium carbonate, 0.8 wt% hydrogen peroxide, 20 wt% sodium sulfate, and the balance is water. Control the reaction temperature at 20°C. Add reaction liquid A, reaction liquid B, and reaction liquid C into the reactor respectively. The reaction time is 30 minutes. After the reaction, keep stirring at 1000 rpm for 5 minutes, and then immediately send it into the spray drying tower for spray drying. The temperature in the spray drying tower is 160°C, the vacuum degree is 20 kPa, and the residence time is 20 minutes to obtain the final composition.

[0051] The preparation method of the stabilizer is the same as that in Example 1.

[0052] Example 3

[0053] The preparation method of a composition for improving the stability and activity of sodium percarbonate is basically the same as that in Example 1, and the only difference is the different preparation method of the stabilizer.

[0054] The preparation method of the stabilizer is as follows: First, mix 120 g of nano zinc oxide and 30 g of polyaniline, then add 1200 g of absolute ethanol, 8 g of N-3-(triethoxysilyl)propyl-N-3-(trimethoxysilyl)propylurea, and 4 g of aluminum phosphate and mix them. Stir with ultrasonic for 40 minutes, the ultrasonic power is 300 W, and the ultrasonic frequency is 40 kHz. Then treat at 65°C for 45 minutes to obtain the stabilizer.

[0055] Example 4

[0056] The preparation method of a composition for improving the stability and activity of sodium percarbonate is basically the same as that in Example 1, and the only difference is the different preparation method of the stabilizer.

[0057] The preparation method of the stabilizer is as follows: First, mix 120 g of fumed silica and 30 g of nano boron nitride, then add 1200 g of absolute ethanol, 8 g of N-3-(triethoxysilyl)propyl-N-3-(trimethoxysilyl)propylurea, and 4 g of aluminum phosphate and mix them. Stir with ultrasonic for 40 minutes, the ultrasonic power is 300 W, and the ultrasonic frequency is 40 kHz. Then treat at 65°C for 45 minutes to obtain the stabilizer.

[0058] Example 5

[0059] The preparation method of a composition for improving the stability and activity of sodium percarbonate is basically the same as that in Example 1, and the only difference is the different preparation method of the stabilizer.

[0060] The preparation method of the stabilizer is as follows: First, 120 g of fumed silica and 30 g of polyaniline are mixed. Then, 1200 g of absolute ethanol, 8 g of 3-[tris(hexyloxy)silyl]propylamine, and 4 g of aluminum phosphate are added and mixed. The mixture is ultrasonically stirred for 40 minutes at an ultrasonic power of 300 W and an ultrasonic frequency of 40 kHz, and then treated at 65 °C for 45 minutes to obtain the stabilizer.

[0061] Example 6

[0062] The preparation method of a composition for improving the stability and activity of sodium percarbonate is basically the same as that of Example 1, and the only difference lies in the different preparation method of the stabilizer.

[0063] The preparation method of the stabilizer is as follows: First, 120 g of fumed silica and 30 g of polyaniline are mixed. Then, 1200 g of absolute ethanol, 8 g of N-[3-[tris(octyloxy)silyl]propyl]ethylenediamine, and 4 g of aluminum phosphate are added and mixed. The mixture is ultrasonically stirred for 40 minutes at an ultrasonic power of 300 W and an ultrasonic frequency of 40 kHz, and then treated at 65 °C for 45 minutes to obtain the stabilizer.

[0064] Example 7

[0065] The preparation method of a composition for improving the stability and activity of sodium percarbonate is basically the same as that of Example 1, and the only difference lies in the different preparation method of the stabilizer.

[0066] The preparation method of the stabilizer is as follows: First, 120 g of graphene and 30 g of polyaniline are mixed. Then, 1200 g of absolute ethanol, 8 g of N-3-(triethoxysilyl)propyl-N-3-(trimethoxysilyl)propylurea, and 4 g of aluminum phosphate are added and mixed. The mixture is ultrasonically stirred for 40 minutes at an ultrasonic power of 300 W and an ultrasonic frequency of 40 kHz, and then treated at 65 °C for 45 minutes to obtain the stabilizer.

[0067] Example 8

[0068] The preparation method of a composition for improving the stability and activity of sodium percarbonate is basically the same as that of Example 1, and the only difference lies in the different preparation method of the stabilizer.

[0069] The preparation method of the stabilizer is as follows: First, 120 g of fumed silica and 30 g of carbon nanotubes are mixed. Then, 1200 g of absolute ethanol, 8 g of N-3-(triethoxysilyl)propyl-N-3-(trimethoxysilyl)propylurea, and 4 g of aluminum phosphate are added and mixed. The mixture is ultrasonically stirred for 40 minutes at an ultrasonic power of 300 W and an ultrasonic frequency of 40 kHz, and then treated at 65 °C for 45 minutes to obtain the stabilizer.

[0070] Example 9

[0071] The preparation method of a composition for improving the stability and activity of sodium percarbonate is basically the same as that of Example 1, and the only difference is the preparation method of the stabilizer.

[0072] The preparation method of the stabilizer is as follows: First, 120 g of fumed silica and 30 g of polyaniline are mixed, then 1200 g of absolute ethanol, 8 g of N-(2-aminoethyl)-3-aminopropyltrimethoxysilane and 4 g of aluminum phosphate are added and mixed. Ultrasonic mixing and stirring are carried out for 40 minutes, the ultrasonic power is 300 W, and the ultrasonic frequency is 40 kHz. Subsequently, it is treated at 65 °C for 45 minutes to obtain the stabilizer.

[0073] Example 10

[0074] The preparation method of a composition for improving the stability and activity of sodium percarbonate is as follows: Step 1: Put 1.5 kg of sodium carbonate decahydrate and 1 kg of mother liquor into the slurry tank. The mother liquor contains 6 wt% sodium carbonate, 0.8 wt% hydrogen peroxide, 20 wt% sodium sulfate and the balance is water. Heat it to 30 °C and treat it for 2 hours to obtain reaction liquid A; in 1 kg of hydrogen peroxide solution with a mass concentration of 35%, add 5 g of sodium polyacrylate and 5 g of diethylenetriamine pentamethylenephosphonic acid, stir until completely dissolved, and then cool it to 5 °C to obtain reaction liquid B; in 1 kg of water, add 100 g of ethylenediaminetetramethylenephosphonic acid and 50 g of stabilizer, stir until completely dissolved to obtain reaction liquid C; Step 2: Add 2 kg of mother liquor as the bottom liquid to the reaction kettle. The mother liquor contains 6 wt% sodium carbonate, 0.8 wt% hydrogen peroxide, 20 wt% sodium sulfate and the balance is water. Control the reaction temperature at 20 °C, and add reaction liquid A, reaction liquid B and reaction liquid C to the reaction kettle respectively. The reaction time is 30 minutes. After the reaction is completed, keep stirring at 1000 rpm for 5 minutes, and then immediately send it into the spray drying tower for spray drying. The temperature in the spray drying tower is 160 °C, the vacuum degree is 20 kPa, and the residence time is 20 minutes to obtain the final composition.

[0075] The preparation method of the stabilizer is the same as that of Example 1.

[0076] Comparative Example 1 The preparation method of a composition for improving the stability and activity of sodium percarbonate is as follows: Step 1: Put 1.5 kg of sodium carbonate decahydrate and 1 kg of mother liquor into the slurry tank. The mother liquor contains 6% sodium carbonate, 0.8% hydrogen peroxide, 20% sodium sulfate, and the balance is water. Heat it to 30 °C and treat for 2 hours to obtain reaction liquid A; in 1 kg of hydrogen peroxide solution with a mass concentration of 35%, add 5 g of sodium polyacrylate and 5 g of diethylenetriamine pentamethylenephosphonic acid, stir until completely dissolved, and then cool to 5 °C to obtain reaction liquid B; add 100 g of trisodium phosphate to 1 kg of water, stir until completely dissolved, and obtain reaction liquid C. Step 2: Add 2 kg of mother liquor as the bottom liquid to the reaction kettle. The mother liquor contains 6% sodium carbonate, 0.8% hydrogen peroxide, 20% sodium sulfate, and the balance is water. Control the reaction temperature at 20 °C, and add reaction liquid A, reaction liquid B, and reaction liquid C to the reaction kettle respectively. The reaction time is 30 minutes. After the reaction, keep stirring at 1000 rpm for 5 minutes, and then immediately send it into the spray drying tower for spray drying. The temperature in the spray drying tower is 160 °C, the vacuum degree is 20 kPa, and the residence time is 20 minutes to obtain the final composition.

[0077] Test Example 1 Stability performance test Determine the thermal stability and wet stability of the composition prepared by the present invention (determination standard: "HG / T 2764-2013 Industrial Sodium Percarbonate"). The specific test data are shown in Table 1.

[0078] Table 1

[0079] Test Example 2 Washing effect test Add the composition prepared by the present invention to the commercially available liquid detergent according to the proportion of 1% by mass fraction of the detergent for use. During the washing process, let the protected sodium percarbonate be released, so as to achieve the washing or bleaching function.

[0080] Evaluation of washing effect: Select 36 pieces of clothes with similar degrees of newness, dirtiness, and clothing size, divide them into 9 groups, with 4 pieces in each group, and wash them respectively using the composition prepared by the present invention. Use the machine washing method, record the cleaning effect of the washing. The method for judging the cleaning effect is: the score is 0-10 points, 0 points represents very poor, and 10 points represents very good. The method for judging the deodorization effect is: the score is 0-10 points, 0 points represents very poor, and 10 points represents very good. Take the average value, and the test results are shown in Table 2.

[0081] Table 2

[0082] From the data of Test Examples 1 to 2, it can be seen that the stability performance and washing effect on clothes of the composition prepared in Example 1 are the best compared with those prepared in Examples 3 to 10.

[0083] Sodium percarbonate is chemically unstable and easily decomposes when exposed to high temperature, water or heavy metal ions, resulting in a decrease in the stability of active oxygen. In the present invention, fumed silica and polyaniline are mixed, and then anhydrous ethanol, N-3-(triethoxysilyl)propyl-N-3-(trimethoxysilyl)propylurea and aluminum phosphate are added to prepare a stabilizer. The coating effect of the stabilizer effectively isolates moisture and heavy metal ions, significantly improving the stability and dispersibility of sodium percarbonate, and thus enhancing its application performance in complex environments.

[0084] The stabilizer prepared with fumed silica in Example 1 exhibits better stability performance and washing effect, mainly due to the unique physical and chemical properties of fumed silica. Fumed silica has an extremely high specific surface area and abundant surface hydroxyl groups. These hydroxyl groups can undergo chemical bonding with silane coupling agents (such as N-3-(triethoxysilyl)propyl-N-3-(trimethoxysilyl)propylurea) to form a stable network structure, thereby effectively coating sodium percarbonate particles and enhancing their thermal stability and wet stability. In addition, the nano-sized particle size and good dispersibility of fumed silica enable it to be evenly distributed on the surface of sodium percarbonate, further improving the dispersibility and anti-decomposition ability of sodium percarbonate. It shows good dispersibility in the detergent system, effectively reducing the surface tension and enhancing the foam stability, and thus improving the washing effect. In contrast, although nano-zinc oxide has certain chemical stability, its surface activity and coating effect are not as good as those of fumed silica; although graphene has excellent conductivity and specific surface area, its dispersibility and stability in water are poor and it is prone to agglomeration, resulting in poor coating effect. Therefore, the use of fumed silica in Example 1 significantly improves the stability and washing effect of sodium percarbonate, making it perform the best in various tests.

[0085] In Example 1, polyaniline was used as a component of the stabilizer, which showed more excellent stability and washing effect compared with nano boron nitride and carbon nanotubes. This is mainly attributed to the chemical and physical properties of polyaniline. Polyaniline has good electrical conductivity and chemical stability, and can form a uniform coating layer on the surface of sodium percarbonate, effectively isolating decomposition factors such as moisture and heavy metal ions, thus significantly improving the thermal stability and wet stability of sodium percarbonate. In addition, the high specific surface area and porous structure of polyaniline enable it to better adsorb and disperse stains during the washing process, enhancing the washing effect. In contrast, although nano boron nitride has good thermal conductivity and chemical stability, its coating effect and adsorption ability are not as good as those of polyaniline; carbon nanotubes have poor stability and washing effect due to easy agglomeration and poor dispersibility. Therefore, polyaniline is a key component of the stabilizer in the present invention, significantly improving the comprehensive performance of sodium percarbonate.

[0086] In Example 1, N-3-(triethoxysilyl)propyl-N-3-(trimethoxysilyl)propylurea was used as the silane coupling agent, which showed more excellent stability and washing effect compared with different silane coupling agents used in other examples and comparative examples. This is mainly attributed to its unique chemical structure and reaction characteristics. N-3-(triethoxysilyl)propyl-N-3-(trimethoxysilyl)propylurea contains two different siloxane groups, which can form more stable chemical bonds with fumed silica, etc., thus constructing a denser and more uniform coating layer. This coating layer can not only effectively isolate decomposition factors such as moisture and heavy metal ions, but also enhance the thermal stability and wet stability of sodium percarbonate. In contrast, although other silane coupling agents (such as 3-[tris(hexyloxy)silyl]propylamine, N-[3-[tris(octyloxy)silyl]propyl]ethylenediamine, N-(2-aminoethyl)-3-aminopropyltrimethoxysilane) can also provide certain stabilizing effects, their chemical bonding ability and coating effect are not as good as those of N-3-(triethoxysilyl)propyl-N-3-(trimethoxysilyl)propylurea, resulting in slightly inferior performance in terms of stability and washing effect. Therefore, N-3-(triethoxysilyl)propyl-N-3-(trimethoxysilyl)propylurea used in Example 1 is the most prominent in enhancing the comprehensive performance of sodium percarbonate.

[0087] In Example 2, hydrolyzed polymaleic anhydride was used as a crystallization aid, which showed more excellent stability and washing effect compared with diethylenetriamine pentamethylenephosphonic acid in Example 1 and ethylenediamine tetramethylenephosphonic acid in Example 10. Hydrolyzed polymaleic anhydride has a highly polymerized carboxyl structure, and these carboxyl groups can form stable chelates with metal ions (such as calcium, magnesium, iron, etc.) in sodium percarbonate, thus effectively inhibiting the catalytic effect of these ions on the decomposition of sodium percarbonate. In addition, the polymerized structure of hydrolyzed polymaleic anhydride gives it better dispersibility and uniformity in solution, and it can form a denser protective layer on the surface of sodium percarbonate, further enhancing its thermal stability and wet stability. During the washing process, the high molecular weight and linear structure of hydrolyzed polymaleic anhydride enable it to better disperse stains, improve the washing efficiency and deodorization effect. Therefore, hydrolyzed polymaleic anhydride performs well in enhancing the stability and washing performance of sodium percarbonate.

Claims

1. A method for preparing a composition for improving the stability and activity of sodium percarbonate, characterized in that: The method is as follows, in parts by weight: Step 1, 1-2 parts of sodium carbonate decahydrate and 0.5-2 parts of mother liquor are put into a slurry tank, heated to 25-35° C. for 1-3 hours to obtain reaction solution A; 0.006-0.016 parts of crystallization aid A are added to 0.5-2 parts of hydrogen peroxide solution with a mass concentration of 25%-35%, stirred until completely dissolved, and cooled to 3-8° C. to obtain reaction solution B; 0.05-0.2 parts of crystallization aid B and 0.03-0.08 parts of stabilizer are added to 0.5-2 parts of water, stirred until completely dissolved, to obtain reaction solution C; Step 2, adding 1 to 3 parts of the mother liquor as the base liquid into the reactor, controlling the reaction temperature at 15 to 25° C., respectively adding the reaction liquid A, the reaction liquid B and the reaction liquid C into the reactor, and the reaction time is 10 to 50 minutes. After the reaction is completed, stirring is maintained at 800 to 1200 rpm for 3 to 8 minutes, and then immediately sent to a spray drying tower for spray drying to obtain a final composition; The crystallization aid A is at least one of ethylenediaminetetraacetic acid, aminotrimethylenephosphonic acid, hydroxyethylenediphosphonic acid, sodium citrate, sodium polyacrylate, and diethylenetriaminepentamethylenephosphonic acid; The crystallization aid B is at least one of sodium pyrophosphate, sodium tripolyphosphate, sodium hexametaphosphate, trisodium phosphate, disodium hydrogen phosphate, ammonium pyrophosphate, ethylenediaminetetramethylenephosphoric acid, and hydrolyzed polymaleic anhydride; The preparation method of the stabilizer is as follows, in parts by weight: First, 100-150 parts of inorganic materials and 20-40 parts of functional agents are mixed, and then 1000-1500 parts of anhydrous ethanol, 5-10 parts of silane coupling agents and 2-6 parts of aluminum phosphate are added, mixed and ultrasonically stirred, and then treated at 60-70° C. for 30-50 minutes to obtain a stabilizer.

2. the preparation method of the composition that improves sodium percarbonate stability and activity as claimed in claim 1, is characterized in that, The temperature in the spray drying tower is 150-170° C., the vacuum degree is 15-25 kPa, and the stay time is 10-30 minutes.

3. the preparation method of the composition that improves sodium percarbonate stability and activity as claimed in claim 1, is characterized in that, The mother liquor contains 6wt% to 8wt% of sodium carbonate, 0.5wt% to 1wt% of hydrogen peroxide, 14wt% to 28wt% of sodium sulfate and the balance is water.

4. The preparation method of the composition improving sodium percarbonate stability and activity as claimed in claim 1, characterized in that, The functional agent is at least one of polyaniline, nano boron nitride and carbon nanotube.

5. the preparation method of the composition that improves sodium percarbonate stability and activity as claimed in claim 1, is characterized in that, The silane coupling agent is at least one of N-3-(triethoxysilyl)propyl-N-3-(trimethoxysilyl)propaneurea, 3-[tri(hexyloxy)silyl]propylamine, N-[3-[tri(octyloxy)silyl]propyl]ethylenediamine, and N-(2-aminoethyl)-3-aminopropyltrimethoxysilane.

6. The preparation method of the composition improving sodium percarbonate stability and activity as claimed in claim 1, characterized in that, The inorganic material includes at least one of graphene, nano zinc oxide and fumed silicon dioxide.

7. The preparation method of the composition improving sodium percarbonate stability and activity as claimed in claim 1, characterized in that, The ultrasonic mixing and stirring is performed for 20 to 50 minutes, the ultrasonic power is 200 to 400 W, and the ultrasonic frequency is 20 to 60 kHz.

8. A composition for improving the stability and activity of sodium percarbonate, characterized in that: The method is prepared by the method according to any one of claims 1 to 7.

9. An application of a composition for improving the stability and activity of sodium percarbonate as claimed in claim 8, characterized in that: Used in the field of industrial cleaning of detergents, bleaches and disinfectants.

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