Preparation method and application of solid water based on bran and starch waste liquid

Abstract

The invention relates to preparation of indoor potting solid water, and belongs to the field of solid water preparation.The preparation method comprises the steps that nitrogen is introduced into a four-opening flask for 10 min, air is removed, wheat bran and wheat B starch wastewater are added, heating and stirring are conducted to be uniform, sodium alginate and gellan gum are added, and mixing is conducted to prepare a solution A; the preparation method comprises the following steps: adding a 25% NaOH solution into acrylic acid under an ice-water bath condition for neutralization, cooling a neutralized solution to room temperature, adding 2-acrylamide-2-methylpropanesulfonic acid, bentonite, methylene bisacrylamide and potassium persulfate, and fully and uniformly stirring to obtain a solution B; slowly adding the solution B into the solution A, heating, stirring, carrying out polymerization reaction, filtering after the reaction is ended, and washing with absolute ethyl alcohol and distilled water, so as to obtain the special solid water for indoor potting. The indoor potting solid water provided by the invention can provide convenience for workers to maintain potting plants, can improve soil permeability and water absorption and retention capability, has a long service cycle, is prepared from natural degradable materials, and has low cost.

Description

Technical Field

[0001] The present invention relates to the field of solid water preparation, and in particular to a method for preparing solid water exclusively for indoor potted plants and its application. Background Art

[0002] Planting flowers and plants can enhance living spaces and bring a sense of joy and comfort. In the hectic workplace, growing flowers and plants can also be a way to relax, offering a moment of tranquility and beauty amidst the hustle and bustle of work. Consequently, the number of people growing indoor plants is increasing. Most indoor plants are grown directly in pots and placed in homes. However, as these plants become commonplace, some issues associated with indoor plants have gradually emerged. For example, environmental constraints such as limited soil, insufficient ventilation, insufficient water management, and limited sunlight can easily cause plants to wilt, making proper management and watering crucial. With the rapid development of society, business trips have become commonplace, but these trips often leave people's plants unattended. Asking friends, neighbors, or family members to care for plants and plants, or regularly watering them at home, is often unrealistic. Considering purchasing automatic watering systems, such as drip irrigation systems or timed sprinklers, to ensure that plants receive the proper amount of water is not cost-effective. Therefore, finding a practical and economical way to care for plants at home has become a pressing need for many business travelers.

[0003] Solid water, also known as dry water abroad, contains over 90% water and is an eco-friendly product that integrates microbiological and chemical technologies. Compared to ordinary water, solid water possesses the physical characteristics of a solid substance. It is biodegradable, leaving no residue after degradation and preventing soil contamination, making it a long-term water source for plants. Therefore, it is often likened to a "miniature reservoir" in agriculture and is effective in promoting plant growth and development.

[0004] Commercially available solid water is suitable for agriculture and forestry, but not for indoor potted plants with limited soil. It also suffers from poor salt tolerance and high levels of residual monomers. We urgently need a non-toxic, harmless, green, biodegradable material that is both practical and economical, specifically designed for indoor potted plants. This solid water will undoubtedly solve a long-standing problem for business travelers, allowing their plants to thrive even without human care. Of course, to better meet this market demand, we need to develop specialized solid water for indoor potted plants. While many new biodegradable water-absorbing and inorganic materials have been reported, their simple preparation and application for potted plant water retention remain significant challenges. Summary of the Invention

[0005] In order to overcome the shortcomings of the existing technology, the present invention provides a method for preparing solid water exclusively for indoor potted plants and its application. Wheat bran, wheat B starch, sodium alginate, gellan gum, and other materials can be combined through simple preparation to prepare solid water exclusively for indoor potted plants. The solid water is degradable, stable, and has a high water retention rate.

[0006] The present invention provides a method for preparing and applying solid water specifically for indoor potted plants. To achieve the above objectives, the present invention employs the following technical solution: the raw materials for the solid water include wheat bran, wheat B starch, sodium alginate, gellan gum, a monomer acrylic acid solution, a sodium hydroxide solution, the inorganic material bentonite, the monomer 2-acrylamide-2-methylpropanesulfonic acid, the crosslinking agent methylenebisacrylamide, and the initiator potassium persulfate; the method comprises the following steps:

[0007] S1: Nitrogen was introduced into a four-necked flask for 10 minutes to remove air, and wheat bran and wheat B starch wastewater were added. The mixture was heated to 72°C-90°C and stirred evenly until the temperature dropped to 35°C-55°C and remained constant. Then, sodium alginate and gellan gum were added to the flask and mixed to prepare solution A.

[0008] S2: The acrylic acid solution was neutralized by adding 25% NaOH solution in an ice bath. This neutralization reaction is exothermic and is therefore carried out in an ice bath. After the neutralized solution was cooled to room temperature, 2-acrylamide-2-methylpropanesulfonic acid monomer, initiator potassium persulfate, inorganic material bentonite, and crosslinking agent methylenebisacrylamide were added and stirred thoroughly to prepare Solution B.

[0009] S3: Liquid B is slowly added to Liquid A and the temperature is raised and stirred to perform a polymerization reaction, wherein Liquid A serves as the main reactant and it is more convenient to add Liquid B to Liquid A;

[0010] S4: Stop stirring when the reaction system becomes viscous and continue the reaction for 0.5h-2h. After the reaction is completed, filter and wash with anhydrous ethanol and distilled water to obtain solid water exclusively for indoor potted plants.

[0011] As a preferred technical solution of the present invention, the wheat bran content in S1 accounts for 2%-10% of the total weight of the solid water raw materials. A too low wheat bran content leads to a shortage of water-absorbing material, reducing the water absorption effect. A too high wheat bran content acts as a filler, reducing the osmotic pressure between the polymer network and the external solution, resulting in a decrease in the relative proportion of hydrophilic groups and a reduction in water absorption effect. Wheat B starch accounts for 2%-5% of the total weight of the solid water raw materials, and the sodium alginate content accounts for 1%-7% of the total weight of the solid water raw materials. A too low sodium alginate content reduces the stability of the polymer network structure and the water retention performance. A too high sodium alginate content increases the viscosity of the reaction system, restricting the movement of reactants and reducing the monomer conversion rate and grafting rate, thereby weakening the water retention effect. Gellan gum accounts for 1%-2% of the total weight of the solid water raw material. The mass ratio of low-acyl gellan gum to high-acyl gellan gum in the gellan gum is 2:1-1:2. Too low a gellan gum content will prevent the solid water from solidifying and reduce the sustained release effect of the solid water. A high gellan gum content will densify the three-dimensional polymer network, affecting the sustained release effect of the water. Deionized water is used in an amount of 300mL-500mL. Heat and stir for 0.5-2 hours at a temperature of 70℃-90℃. Lower heating temperatures will result in incomplete reaction, while higher heating temperatures will increase processing difficulty and energy consumption, and destroy the internal network structure of wheat bran, sodium alginate, and gellan gum.

[0012] As a preferred technical solution of the present invention, 20mL-60mL of acrylic acid is taken in S2 to make the neutralization degree 40%-70%. If the neutralization degree of the reaction system is too low, Na +Too low a concentration results in reduced osmotic pressure, hindering water absorption. Over-neutralization, which results in a higher number of carboxylate groups being neutralized, weakens electrostatic repulsion and reduces water absorption. The initiator, potassium persulfate, accounts for 0.05%-1% of the acrylic acid monomer mass. Too low a potassium persulfate content reduces the number of free radicals, lowering the monomer grafting rate, resulting in an incomplete three-dimensional network structure and reduced liquid absorption capacity. The mass ratio of 2-acrylamide-2-methylpropanesulfonic acid to acrylic acid is 1:3-2:1. Too low a 2-acrylamide-2-methylpropanesulfonic acid content reduces the sulfonic acid groups, which are relatively hydrophilic, and thus impairs water absorption. Too high a 2-acrylamide-2-methylpropanesulfonic acid content increases the number of hydrophilic sulfonic acid groups, increasing steric hindrance and hindering the copolymerization of acrylic acid and 2-acrylamide-2-methylpropanesulfonic acid monomers, leading to a poor three-dimensional internal network structure. The crosslinker, methylenebisacrylamide, should comprise 0.05%-1.0% of the acrylic acid monomer weight. Too low a crosslinker content reduces the number of crosslinking points, resulting in an incomplete three-dimensional network structure and poor water absorption. Too high a crosslinker content creates an overly dense crosslinking structure, making it difficult for water molecules to enter, resulting in poor water absorption. Bentonite should comprise 2%-5% of the acrylic acid monomer weight. Too low a bentonite content prevents synergistic crosslinking with methylenebisacrylamide. Too high a bentonite content increases the degree of crosslinking and fills the polymer network, hindering expansion of the three-dimensional network and impairing water absorption. The stirring speed should be 150-350 rpm and the stirring temperature should be 60°C-80°C. A low stirring temperature will slow the reaction and lead to an incomplete reaction. A high stirring temperature will accelerate the reaction, causing unnecessary polymerization of the acrylic acid monomer, uncontrollable changes in the molecular structure of acrylic acid and bentonite, and increased energy consumption. Proper stirring temperature ensures the product forms an optimal water-absorbing structure and achieves the desired effect.

[0013] As a preferred technical solution of the present invention, the stirring speed in S3 is 150-350 rpm, the polymerization reaction is carried out when the temperature is raised to 65°C-85°C, and the reaction time is 1-4 hours. If the polymerization temperature is too low, the graft polymerization temperature will not be reached, the reaction process will be prolonged, and the cross-linking of the grafted chains will be difficult. If the polymerization temperature is too high, the reaction rate will be accelerated, the degree of cross-linking will be uneven, the three-dimensional network structure will not be dense, the internal structure of the polymer will be changed, and the water absorption effect will be reduced. If the reaction time is too short, the polymerization reaction will be incomplete, the monomer conversion rate will be low, and the product amount will be small. If the reaction time is too long, the three-dimensional network structure will produce more branch chains, which will polymerize with each other, limit the expansion of the internal space of the polymerization network, and reduce the water absorption capacity.

[0014] As a preferred technical solution of the present invention, the bentonite in S2 is stirred for 0.5-1.5 hours.

[0015] As a preferred technical solution of the present invention, the solid water surface obtained in S4 is cut into a "V"-shaped opening to contact the roots of potted plants, and then filled with soil for use by the potted plants.

[0016] As a preferred technical solution of the present invention, the wheat bran is ground into a powder. As a natural, environmentally friendly material, it primarily serves to improve solid water absorption and stability. Furthermore, the wheat bran powder can be treated with microorganisms to decompose and transform the organic matter in the wheat bran powder, making it suitable for use as an organic fertilizer. The microorganisms and metabolites it contains can promote the reproduction of soil microorganisms, improve soil structure, and increase soil fertility. Furthermore, the organic matter in the wheat bran can provide comprehensive nutritional support for potted plants, promoting their growth and development.

[0017] As a preferred technical solution of the present invention, the wheat B starch and sodium alginate, as a natural polysaccharide water-absorbing material, can synergistically work with gellan gum to improve the gel strength to wrap water, and can also increase the water absorption rate of solid water. It can fully utilize wheat processing wastewater resources and marine resources and reduce production costs and pollution. It is non-toxic, renewable and biodegradable.

[0018] As a preferred technical solution of the present invention, the bentonite can improve the mechanical strength of the gel of solid water, thereby increasing the number of reuses and the service life of the solid water.

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

[0020] Wheat bran and wheat B starch are byproducts of wheat processing. Wheat bran, as a natural and environmentally friendly material, can reduce the use of disposable or non-degradable materials, benefiting environmental protection. It primarily increases the water absorption rate and stability of solid water. Microbial treatment can also be used to decompose and transform the organic matter in the wheat bran powder, making it useful as an organic fertilizer. The microorganisms and metabolites it contains can promote the growth of soil microorganisms, improve soil structure, and enhance soil fertility. Furthermore, the organic matter in wheat bran provides comprehensive nutritional support for potted plants, promoting their growth and development. Wheat bran can reduce the use of sodium alginate, lower the viscosity of the reaction system, optimize water-absorbing materials, and is biodegradable. The combined use of wheat B starch, sodium alginate, and wheat bran can increase the water absorption rate of solid water. Its synergistic effect with gellan gum enhances gel strength and water-binding properties. Sodium alginate, as a water-absorbing and water-retaining material, fully utilizes marine resources, reduces production costs and pollution, and is non-toxic, renewable, and biodegradable. Bentonite can improve the mechanical strength of solid water gels, increasing their reuse and service life. Mixing wheat bran, sodium alginate, gellan gum, bentonite and other materials to prepare exclusive solid water for indoor potted plants can reduce the use of organic materials and acrylic monomers in indoor potted plants with limited soil, maximize the use of natural degradable materials, and reduce environmental pollution. Compared with solid water on the market, it has good stability and salt tolerance, a long service life, high water retention and water absorption rates, low price of raw materials, simple preparation process, and the moisture content of the prepared solid water can reach more than 92%. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In order for those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below.

[0022] Example:

[0023] Example 1:

[0024] A method for preparing solid water specifically for indoor potted plants and its application, characterized in that the raw materials of the solid water include wheat bran, wheat B starch, sodium alginate, gellan gum, acrylic acid solution, sodium hydroxide solution, bentonite, 2-acrylamide-2-methylpropanesulfonic acid, methylenebisacrylamide, and potassium persulfate; and the method comprises the following steps:

[0025] S1: nitrogen was introduced into a four-necked flask for 10 minutes to remove air, and wheat bran and wheat B starch wastewater were added. The mixture was heated to 72°C and stirred evenly until the temperature dropped to 35°C and remained unchanged. Then, sodium alginate and gellan gum were added to the flask and mixed to prepare liquid A, wherein the wheat bran content was 2%, the wheat B starch content was 1%, the sodium alginate content was 1%, and the gellan gum content was 1%. In the gellan gum, the mass ratio of low acyl gellan gum to high acyl gellan gum was 2:1. 300 ml of deionized water was added and the mixture was heated and stirred for 0.5 h.

[0026] S2: Take the acrylic acid solution and add 25% NaOH solution in an ice bath to neutralize it. After the neutralized solution is cooled to room temperature, 2-acrylamide-2-methylpropanesulfonic acid, bentonite, methylenebisacrylamide and potassium persulfate are added and stirred thoroughly to prepare solution B, wherein 20 mL of acrylic acid is added to achieve a neutralization degree of 40%, 0.05% potassium persulfate, a ratio of 1:3 of acrylamide-2-methylpropanesulfonic acid and acrylic acid, 2% bentonite, and 0.4% methylenebisacrylamide are added. The stirring speed is 150 rpm and the stirring time is 1 hour.

[0027] S3: Liquid B was slowly added to Liquid A and the temperature was raised and stirred to carry out polymerization reaction; the stirring speed was 150 rpm, the polymerization reaction was carried out when the temperature was raised to 65°C, and the reaction time was 1 hour;

[0028] S4: After the reaction is completed, the mixture is filtered and washed with anhydrous ethanol and distilled water to obtain solid water specifically for indoor potted plants. The prepared solid water has a moisture content of about 91.3%.

[0029] Example 2:

[0030] S1: nitrogen was introduced into a four-necked flask for 10 minutes to remove air, and wheat bran and wheat B starch wastewater were added. The mixture was heated to 81°C and stirred evenly until the temperature dropped to 45°C and remained unchanged. Then, sodium alginate and gellan gum were added to the flask and mixed to prepare liquid A; the liquid A contained 6% wheat bran, 3% wheat B starch, 4% sodium alginate, and 1.5% gellan gum. The mass ratio of low acyl gellan gum to high acyl gellan gum in the gellan gum was 5:4. 400 ml of deionized water was added and the mixture was heated and stirred for 1.5 hours.

[0031] S2: Take the acrylic acid solution and add 25% NaOH solution under ice bath conditions for neutralization. This neutralization reaction is an exothermic reaction and is therefore carried out under ice bath conditions. After the neutralized solution is cooled to room temperature, the monomer 2-acrylamide-2-methylpropanesulfonic acid, the initiator potassium persulfate, the inorganic material bentonite, and the crosslinking agent methylenebisacrylamide are added and stirred thoroughly to prepare solution B. 40 mL of acrylic acid is added to achieve a neutralization degree of 60%, 0.5% potassium persulfate, a 1:1 ratio of acrylamide-2-methylpropanesulfonic acid and acrylic acid, 4% bentonite, and 0.4% methylenebisacrylamide. The stirring speed is 250 rpm and the stirring time is 1.5 hours.

[0032] S3: Slowly add liquid B into liquid A and heat and stir to carry out polymerization reaction;

[0033] S4: When the reaction system becomes viscous, stirring is stopped and the reaction is continued for 1 hour. After the reaction is completed, the mixture is filtered and washed with anhydrous ethanol and distilled water to obtain solid water suitable for indoor potted plants. The water content of the prepared solid water is about 94.2%.

[0034] Example 3:

[0035] S1: nitrogen was introduced into a four-necked flask for 10 minutes to remove air, and wheat bran and wheat B starch wastewater were added. The mixture was heated to 90°C and stirred evenly until the temperature dropped to 55°C and remained unchanged. Then, sodium alginate and gellan gum were added to the flask and mixed to prepare liquid A; the content of the liquid A was 10% wheat bran, 5% wheat B starch, 7% sodium alginate, and 2% gellan gum. The mass ratio of low acyl gellan gum to high acyl gellan gum in the gellan gum was 1:2. 500 ml of deionized water was added and the mixture was heated and stirred for 2 hours.

[0036] S2: Add 25% NaOH solution to the acrylic acid solution in an ice bath for neutralization. This neutralization reaction is exothermic and is therefore carried out in an ice bath. After the neutralized solution is cooled to room temperature, the monomer 2-acrylamide-2-methylpropanesulfonic acid, the initiator potassium persulfate, the inorganic material bentonite, and the crosslinking agent methylenebisacrylamide are added and stirred thoroughly to prepare solution B. 60 mL of acrylic acid is added to achieve a neutralization degree of 70%, potassium persulfate is added (1%), a ratio of acrylamide-2-methylpropanesulfonic acid to acrylic acid is 2:1, bentonite is added (5%), and methylenebisacrylamide is added (0.4%). The stirring speed is 350 rpm and the stirring time is 2 hours.

[0037] S3: Slowly add liquid B into liquid A and heat and stir to carry out polymerization reaction;

[0038] S4: When the reaction system becomes viscous, stirring is stopped and the reaction is continued for 1 hour. After the reaction is completed, the mixture is filtered and washed with anhydrous ethanol and distilled water to obtain solid water suitable for indoor potted plants. The prepared solid water has a moisture content of about 92.2%.

[0039] Example 4:

[0040] A method for using solid water exclusively for indoor potted plants, comprising the following steps:

[0041] (1) Take the prepared solid water, place it in a vacuum drying oven at 80°C, and measure the water content of the solid water.

[0042] (2) After 5 days, weigh the total amount of solid water and record the water content of the solid water.

[0043] The calculation formula of water content is: Water content (%) = (original weight of solid water - dry weight of solid water) / original weight of solid water × 100%.

[0044] Example 5:

[0045] A method for using solid water exclusively for indoor potted plants, comprising the following steps:

[0046] (1) Take the prepared solid water, cut a "V"-shaped opening in the middle of the solid water surface, and place it at an angle at the root area of ​​the potted plant to allow the solid water to flow out naturally and slowly. Then fill it with soil until it is about 2-3 cm away from the top of the flowerpot. In order to keep the soil in the flowerpot compact, press it evenly.

[0047] (2) After standing for 5 days, weigh the total amount of solid water and record the water loss rate of solid water.

[0048] The calculation formula of water loss rate is: water loss rate (%) = (original weight - weight after N days) / original weight × 100%.

[0049] Example 6:

[0050] A method for using solid water exclusively for indoor potted plants, comprising the following steps:

[0051] (1) Take the prepared solid water, cut a "V"-shaped opening in the middle of the solid water surface, and place it at an angle at the root area of ​​the potted plant to allow the solid water to flow out naturally and slowly. Then fill it with soil until it is about 2-3 cm away from the top of the flowerpot. In order to keep the soil in the flowerpot compact, press it evenly.

[0052] (2) After placement, the growth indicators of the potted plants were measured and recorded every 5 days. A portable photosynthetic meter was used to measure the photosynthetic and transpiration rates of the potted plants. A soil moisture meter was used to measure the soil moisture content. The soluble protein content, peroxidase (POD) and superoxide dismutase (SOD) activities, and malondialdehyde (MDA) of the potted plants were measured according to Li Hesheng's method. A chlorophyll meter was used to measure the SPAD value.

[0053] Comparative Example:

[0054] Comparative Example 1:

[0055] S1: Nitrogen was introduced into a four-necked flask for 10 minutes to remove air, and wheat bran and wheat B starch wastewater were added. The mixture was heated to 81°C and stirred evenly. After the temperature dropped to 45°C and remained constant, gellan gum was added to the flask and mixed to prepare liquid A; the wheat bran content was 6%, the gellan gum content was 1.5%, and the mass ratio of low acyl gellan gum to high acyl gellan gum in the gellan gum was 5:4. 400 ml of deionized water was added and the mixture was heated and stirred for 1.5 hours.

[0056] S2: Take the acrylic acid solution and add 25% NaOH solution under ice bath conditions for neutralization. This neutralization reaction is an exothermic reaction and is therefore carried out under ice bath conditions. After the neutralized solution is cooled to room temperature, the monomer 2-acrylamide-2-methylpropanesulfonic acid, the initiator potassium persulfate, the inorganic material bentonite, and the crosslinking agent methylenebisacrylamide are added and stirred thoroughly to prepare solution B. 40 mL of acrylic acid is added to achieve a neutralization degree of 60%, 0.5% potassium persulfate, a 1:1 ratio of acrylamide-2-methylpropanesulfonic acid and acrylic acid, 4% bentonite, and 0.4% methylenebisacrylamide. The stirring speed is 250 rpm and the stirring time is 1.5 hours.

[0057] S3: Slowly add liquid B into liquid A and heat and stir to carry out polymerization reaction;

[0058] S4: When the reaction system becomes viscous, stirring is stopped and the reaction is continued for 1 hour. After the reaction is completed, the mixture is filtered and washed with anhydrous ethanol and distilled water to obtain solid water suitable for indoor potted plants. The water content of the prepared solid water is about 83.3%.

[0059] Comparative Example 2:

[0060] S1: Nitrogen was introduced into a four-necked flask for 10 minutes to remove air, and deionized water was added. The mixture was heated to 81°C and maintained constant after the temperature dropped to 45°C. Then, sodium alginate and gellan gum were added to the flask and mixed to prepare solution A; the sodium alginate content was 4%, the gellan gum content was 1.5%, and the mass ratio of low acyl gellan gum to high acyl gellan gum in the gellan gum was 5:4. 400 ml of deionized water was added and the mixture was heated and stirred for 1.5 hours.

[0061] S2: Take the acrylic acid solution and add 25% NaOH solution under ice bath conditions for neutralization. This neutralization reaction is an exothermic reaction and is therefore carried out under ice bath conditions. After the neutralized solution is cooled to room temperature, the monomer 2-acrylamide-2-methylpropanesulfonic acid, the initiator potassium persulfate, the inorganic material bentonite, and the crosslinking agent methylenebisacrylamide are added and stirred thoroughly to prepare solution B. 40 mL of acrylic acid is added to achieve a neutralization degree of 60%, 0.5% potassium persulfate, a 1:1 ratio of acrylamide-2-methylpropanesulfonic acid and acrylic acid, 4% bentonite, and 0.4% methylenebisacrylamide. The stirring speed is 250 rpm and the stirring time is 1.5 hours.

[0062] S3: Slowly add liquid B into liquid A and heat and stir to carry out polymerization reaction;

[0063] S4: When the reaction system becomes viscous, stirring is stopped and the reaction is continued for 1 hour. After the reaction is completed, the mixture is filtered and washed with anhydrous ethanol and distilled water to obtain solid water suitable for indoor potted plants. The water content of the prepared solid water is about 80.5%.

[0064] Comparative Example 3:

[0065] S1: Nitrogen was introduced into a four-necked flask for 10 minutes to remove air, and deionized water was added. The mixture was heated to 81°C and stirred evenly. The temperature dropped to 45°C and remained constant. Then, gellan gum was added to the flask and mixed to prepare solution A. The mass ratio of low acyl gellan gum to high acyl gellan gum in the gellan gum was 5:4. 400 ml of deionized water was added. The mixture was heated and stirred for 1.5 hours.

[0066] S2: Take the acrylic acid solution and add 25% NaOH solution under ice bath conditions for neutralization. This neutralization reaction is an exothermic reaction and is therefore carried out under ice bath conditions. After the neutralized solution is cooled to room temperature, the monomer 2-acrylamide-2-methylpropanesulfonic acid, the initiator potassium persulfate, the inorganic material bentonite, and the crosslinking agent methylenebisacrylamide are added and stirred thoroughly to prepare solution B. 40 mL of acrylic acid is added to achieve a neutralization degree of 60%, 0.5% potassium persulfate, a 1:1 ratio of acrylamide-2-methylpropanesulfonic acid and acrylic acid, 4% bentonite, and 0.4% methylenebisacrylamide. The stirring speed is 250 rpm and the stirring time is 1.5 hours.

[0067] S3: Slowly add liquid B into liquid A and heat and stir to carry out polymerization reaction;

[0068] S4: When the reaction system becomes viscous, stirring is stopped and the reaction is continued for 1 hour. After the reaction is completed, the mixture is filtered and washed with anhydrous ethanol and distilled water to obtain solid water suitable for indoor potted plants. The prepared solid water has a moisture content of about 72.2%.

[0069] Performance Testing

[0070] The solid water obtained from Examples 1-3 and Comparative Examples 1-3 was used to test potted plants, and the water content, water loss rate and photosynthetic rate of the potted plant Scindapsus radiata were tested.

[0071] Table 1 Test results of Examples 1-3 and Comparative Examples 1-3

[0072]

[0073] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A method for preparing solid water exclusively for indoor potted plants, characterized in that: The raw materials of the solid water include wheat bran, sodium alginate, gellan gum, monomer acrylic acid solution, sodium hydroxide solution, inorganic material bentonite, monomer 2-acrylamide-2-methylpropane sulfonic acid, cross-linking agent methylene bisacrylamide, and initiator potassium persulfate; the steps include: S1: nitrogen was introduced into a four-necked flask for 10 minutes to remove air, and wheat bran and wheat B starch wastewater were added, and the mixture was heated to 72°C-90°C and stirred evenly until the temperature dropped to 35°C-55°C and remained unchanged, and then sodium alginate and gellan gum were added to the flask and mixed to obtain liquid A; S2: Take the acrylic acid solution and add 25% NaOH solution under ice bath condition to neutralize. This neutralization reaction is an exothermic reaction, so it is carried out under ice bath condition. After the neutralized solution is cooled to room temperature, monomer 2-acrylamide-2-methylpropanesulfonic acid, initiator potassium persulfate, inorganic material bentonite, and crosslinking agent methylenebisacrylamide are added and stirred thoroughly to obtain liquid B; S3: Slowly add liquid B into liquid A and heat and stir to perform polymerization reaction, wherein liquid A is used as the main reactant and liquid B is more convenient to add to liquid A; S4: Stop stirring when the reaction system becomes viscous, and continue the reaction for 0.5h-2h. After the reaction is completed, filter and wash with anhydrous ethanol and distilled water to obtain solid water exclusively for indoor potted plants.

2. The method for preparing solid water exclusively for indoor potted plants according to claim 1, characterized in that: The wheat bran content in the S1 accounts for 2%-10% of the total weight of the solid water raw material, the wheat B starch content accounts for 2%-5% of the total weight of the solid water raw material, the sodium alginate content accounts for 1%-7% of the total weight of the solid water raw material, and the gellan gum accounts for 1%-2% of the total weight of the solid water raw material, wherein the mass ratio of low acyl gellan gum to high acyl gellan gum in the gellan gum is (2:1)-(1:2), the deionized water is 300mL-500mL, and the mixture is heated and stirred for 0.5-2h. The heating temperature is 70°C-90°C.

3. The method for preparing solid water exclusively for indoor potted plants according to claim 1, characterized in that: 20mL-60mL of acrylic acid is taken from S2 to make the neutralization degree 40%-70%, the initiator potassium persulfate accounts for 0.05%-1% of the mass of the acrylic acid monomer, the mass ratio of 2-acrylamide-2-methylpropane sulfonic acid to acrylic acid is (1:3)-(2:1), the cross-linking agent methylenebisacrylamide accounts for 0.05%-1.0% of the mass of the acrylic acid monomer, and bentonite accounts for 2%-5% of the mass of the acrylic acid monomer. The stirring speed is 150-350rpm and the stirring temperature is 60°C-80°C.

4. The method for preparing solid water exclusively for indoor potted plants according to claim 1, characterized in that: In the S3, the stirring speed is 150-350 rpm, the polymerization reaction is carried out when the temperature is raised to 65°C-85°C, and the reaction time is 1-4 hours.

5. The method for preparing solid water exclusively for indoor potted plants according to claim 1, characterized in that: The bentonite in S2 is stirred for 0.5-1.5h.

6. An application of the exclusive solid water for indoor potted plants according to claim 1, characterized in that: A "V"-shaped opening is cut on the surface of the solid water obtained in S4 to contact the roots of the potted plants, and then filled with soil for use by the potted plants.

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