CN113491274A - Citrus sunscreen and preparation method thereof - Google Patents
Citrus sunscreen and preparation method thereof Download PDFInfo
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- A01N37/00—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom having three bonds to hetero atoms with at the most two bonds to halogen, e.g. carboxylic acids
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Abstract
The invention discloses a preparation method of a citrus sun-screening agent and the sun-screening agent prepared by the method, the preparation method comprises the steps of mixing a sodium polyacrylate aqueous solution and a sodium carbonate aqueous solution, adding a calcium chloride aqueous solution into the mixed solution, heating and stirring to prepare a slurry solution, adding ethanol and polyethylene glycol, simultaneously adding an insecticide and an antibacterial agent, stirring, and discharging to obtain the nano sun-screening agent. The novel sunscreen agent prepared by the method of in-situ chemical synthesis solves the problem that the existing sunscreen agent slurry is easy to precipitate, and meanwhile, the sunscreen agent has multiple functions of sun protection, antibiosis, insect killing and the like by adding the antibacterial agent, the insecticide and the like. The raw materials used by the invention are simple and easy to obtain, and the cost is low.
Description
Technical Field
The invention belongs to the field of plant sun protection, and particularly relates to a citrus sun protection agent and a preparation method thereof.
Background
The sunscald disease is a physiological disease of plants caused by high-temperature intensive exposure, particularly, the temperature of fruits is increased, water consumed by evaporation is excessive, and pericarp cells are burnt by high temperature due to drought and water shortage in the weather and strong sunlight irradiation. For citrus, the citrus is generally scorched between 7 and 9 months at the temperature of 35 to 45 ℃, the light receiving surface of the damaged fruit is gray-cyan initially, then the light receiving surface is enlarged into yellow-brown patches, the growth of the fruit is stopped, the fruit is rough and hardened, the diseased part is dry or concave, the serious fruit is necrotic and dehydrated, and the fruit flesh cells are shrunk and cause fruit drop.
At present, the following ways are mainly used for preventing and treating the sunscald of the citrus: firstly, the lime milk prepared by conventional lime powder is sprayed on the surface of the fruit to prevent and treat the sunscald of the fruit. However, the self-made lime milk has a plurality of problems, for example, when the preparation proportion is not proper, the fruit is easy to cause phytotoxicity; the paint is easy to fall off when meeting rain after spraying, needs to be sprayed again, wastes materials, pollutes soil and environment, and increases labor cost; the lime milk is too strong in alkalinity and is not suitable for being mixed with fruit tree insect and disease prevention agents; secondly, the orange fruits are whitened one by bagging instead of manual work, so that the method has the advantages of time saving, high efficiency, safety, saving and the like, not only can prevent the occurrence of sunscald of the orange fruits, but also can avoid harmful pollution and damage to human bodies caused by whitening, but the bagged oranges do not receive direct irradiation of sunlight, and the taste of the fruits is poor; thirdly, the novel sun-screening agent prepared by adopting the micro-nano material capable of reflecting sunlight is sprayed on the surface of the citrus after being diluted, a continuous sunlight reflection film layer can be formed on the surface, the citrus can be effectively prevented from being burnt by sunlight, and meanwhile, the formed film layer has good air permeability and does not influence the photosynthesis of plants. The novel sun-screening agent has good sun-screening performance, small side effect and good popularization and application prospect. However, the sunscreen agent is generally prepared from slurry obtained by directly stirring and dispersing inorganic powder, the inorganic powder is easy to agglomerate in the dispersing process, precipitates are generated, and the using effect is influenced.
Disclosure of Invention
The invention provides a preparation method of a novel citrus sun-screening agent and a sun-screening agent prepared by the method aiming at the problems in the existing sun-screening agent, the particles with the sun-screening function are prepared by adopting a chemical in-situ synthesis method, the problems that the existing sun-screening agent slurry is not easy to disperse and easy to agglomerate to generate precipitates are fundamentally solved, and meanwhile, the sun-screening agent has multiple functions of sun-screening, antibiosis, insect killing and the like by adding an antibacterial agent, an insecticide and the like. The raw materials used by the invention are simple and easy to obtain, and the cost is low.
In order to achieve the purpose, the invention adopts the technical scheme that: a preparation method of a citrus sun-screening agent is provided, which comprises the following steps: (1) adding a certain amount of sodium polyacrylate (with molecular weight of 5000) into a proper amount of deionized water, and stirring until the sodium polyacrylate is completely dissolved to prepare a solution; (2) mixing sodium carbonate and a proper amount of deionized water, and strongly stirring to prepare a sodium carbonate aqueous solution with the mass percentage of 50%; (3) mixing the solutions obtained in the step 1 and the step 2, and heating to 40 ℃ under the condition of stirring to form a mixed solution; (4) mixing calcium chloride with a proper amount of deionized water, and strongly stirring to prepare a calcium chloride aqueous solution with the mass percentage of 50%; (5) adding the calcium chloride aqueous solution into the mixed solution obtained in the step (3), and continuously stirring and reacting for 5 hours at 40 ℃ to form a slurry solution; (6) then adding a proper amount of ethanol and polyethylene glycol (molecular weight 4000) into the slurry solution in sequence, stirring until the mixture is uniformly mixed, and discharging to obtain the nano sunscreen agent; when the materials are fed, the sodium polyacrylate, the sodium carbonate, the calcium chloride, the ethanol, the ethylene glycol and the deionized water respectively account for 0.2-0.5%, 25-30%, 2-3%, 1-2% and the balance of the deionized water of the total weight of the materials.
Further, in the step 6, an insecticide is added, accounting for 0.5-1% of the total weight, wherein the insecticide is one of abamectin and tetramethrin.
Further, bactericide which is one of sucrose ester and potassium sorbate and accounts for 0.5-1% of the total weight is added in the step 6.
The invention also provides the citrus sunscreen agent prepared by the method.
Compared with the prior art, the novel citrus sun-screening agent and the preparation method thereof provided by the invention have the following beneficial effects:
1. the invention prepares the citrus sunscreen agent by an in-situ chemical synthesis method, and adds the sodium polyacrylate before the reaction, so that the sodium polyacrylate can be more effectively adsorbed on the surface of calcium carbonate particles to form a physical adsorption layer when the reaction occurs, and the envelope formed by a solvent is removed, thereby preventing the agglomeration of the calcium carbonate particles and improving the dispersibility of the sunscreen agent particles, and further solving the problem that the existing sunscreen agent slurry is easy to generate precipitation only by adopting a stirring physical dispersion mode.
2. According to the invention, polyethylene glycol is added as a thickening agent, so that the viscosity and the rain wash resistance of the sunscreen agent can be effectively improved, the spraying frequency of the sunscreen agent is reduced, and the material and labor cost are saved.
3. The invention improves the spreading and infiltrating property of the sunscreen agent on the plant leaf surface when in use by adding ethanol, and simultaneously improves the drying speed of the sunscreen agent after use.
4. The invention adds antibacterial agent, pesticide and the like to make the sunscreen agent have various functions of sun protection, antibiosis, pesticide and the like.
5. The sun-screening agent has good sun-screening effect, safe and nontoxic components, and improves the safety of food and the safety of users.
Detailed Description
The following specific examples are provided to aid in the understanding of the invention, but are not intended to be limiting thereof.
Example 1
A preparation method of a citrus sunscreen agent comprises the following steps:
1. adding a certain amount of sodium polyacrylate (with molecular weight of 5000) into a proper amount of deionized water, and stirring until the sodium polyacrylate is completely dissolved to prepare a solution; 2. mixing sodium carbonate and a proper amount of deionized water, and strongly stirring to prepare a sodium carbonate aqueous solution with the mass percentage of 50%; 3. mixing the solutions obtained in the step 1 and the step 2, and heating to 40 ℃ under the condition of stirring to form a mixed solution; 4. mixing calcium chloride with a proper amount of deionized water, and strongly stirring to prepare a calcium chloride aqueous solution with the mass percentage of 50%; 5. adding the calcium chloride aqueous solution into the mixed solution obtained in the step (3), and continuously stirring and reacting for 5 hours at 40 ℃ to form a slurry solution; 6. then adding a proper amount of ethanol and polyethylene glycol (molecular weight 4000) into the slurry solution in sequence, stirring until the mixture is uniformly mixed, and discharging to obtain the nano sunscreen agent. According to the percentage (100%) of the total weight of the materials, the components comprise 0.2% of sodium polyacrylate, 25% of sodium carbonate, 25% of calcium chloride, 2% of ethanol, 1% of ethylene glycol and the balance of deionized water.
Example 2
A preparation method of a citrus sunscreen agent comprises the following steps:
1. adding a certain amount of sodium polyacrylate (with molecular weight of 5000) into a proper amount of deionized water, and stirring until the sodium polyacrylate is completely dissolved to prepare a solution; 2. mixing sodium carbonate and a proper amount of deionized water, and strongly stirring to prepare a sodium carbonate aqueous solution with the mass percentage of 50%; 3. mixing the solutions obtained in the step 1 and the step 2, and heating to 40 ℃ under the condition of stirring to form a mixed solution; 4. mixing calcium chloride with a proper amount of deionized water, and strongly stirring to prepare a calcium chloride aqueous solution with the mass percentage of 50%; 5. adding the calcium chloride aqueous solution into the mixed solution obtained in the step (3), and continuously stirring and reacting for 5 hours at 40 ℃ to form a slurry solution; 6. then adding a proper amount of ethanol and polyethylene glycol (molecular weight 4000) into the slurry solution in sequence, stirring until the mixture is uniformly mixed, and discharging to obtain the nano sunscreen agent. According to the percentage (100%) of the total weight of the materials, the components comprise 0.4% of sodium polyacrylate, 28% of sodium carbonate, 28% of calcium chloride, 2.5% of ethanol, 1.5% of ethylene glycol and the balance of deionized water.
Example 3
A preparation method of a citrus sunscreen agent comprises the following steps:
1. adding a certain amount of sodium polyacrylate (with molecular weight of 5000) into a proper amount of deionized water, and stirring until the sodium polyacrylate is completely dissolved to prepare a solution; 2. mixing sodium carbonate and a proper amount of deionized water, and strongly stirring to prepare a sodium carbonate aqueous solution with the mass percentage of 50%; 3. mixing the solutions obtained in the step 1 and the step 2, and heating to 40 ℃ under the condition of stirring to form a mixed solution; 4. mixing calcium chloride with a proper amount of deionized water, and strongly stirring to prepare a calcium chloride aqueous solution with the mass percentage of 50%; 5. adding the calcium chloride aqueous solution into the mixed solution obtained in the step (3), and continuously stirring and reacting for 5 hours at 40 ℃ to form a slurry solution; 6. then adding a proper amount of ethanol and polyethylene glycol (molecular weight 4000) into the slurry solution in sequence, stirring until the mixture is uniformly mixed, and discharging to obtain the nano sunscreen agent. According to the percentage (100%) of the total weight of the materials, the components comprise 0.5% of sodium polyacrylate, 30% of sodium carbonate, 30% of calcium chloride, 3% of ethanol, 2% of ethylene glycol and the balance of deionized water.
Example 4
A preparation method of a citrus sunscreen agent comprises the following steps:
1. adding a certain amount of sodium polyacrylate (with molecular weight of 5000) into a proper amount of deionized water, and stirring until the sodium polyacrylate is completely dissolved to prepare a solution; 2. mixing sodium carbonate and a proper amount of deionized water, and strongly stirring to prepare a sodium carbonate aqueous solution with the mass percentage of 50%; 3. mixing the solutions obtained in the step 1 and the step 2, and heating to 40 ℃ under the condition of stirring to form a mixed solution; 4. mixing calcium chloride with a proper amount of deionized water, and strongly stirring to prepare a calcium chloride aqueous solution with the mass percentage of 50%; 5. adding the calcium chloride aqueous solution into the mixed solution obtained in the step (3), and continuously stirring and reacting for 5 hours at 40 ℃ to form a slurry solution; 6. then adding a proper amount of ethanol and polyethylene glycol (molecular weight 4000) into the slurry solution in sequence, stirring until the mixture is uniformly mixed, then adding the pesticide abamectin and the bactericide sucrose ester, uniformly stirring and discharging to obtain the nano sun-screening agent. According to the percentage (100) of the total weight of the feed, the components comprise 0.4 percent of sodium polyacrylate, 28 percent of sodium carbonate, 28 percent of calcium chloride, 2.5 percent of ethanol, 1.5 percent of glycol, 0.5 percent of abamectin, 0.5 percent of sucrose ester and the balance of deionized water.
Example 5
A preparation method of a citrus sunscreen agent comprises the following steps:
1. adding a certain amount of sodium polyacrylate (with molecular weight of 5000) into a proper amount of deionized water, and stirring until the sodium polyacrylate is completely dissolved to prepare a solution; 2. mixing sodium carbonate and a proper amount of deionized water, and strongly stirring to prepare a sodium carbonate aqueous solution with the mass percentage of 50%; 3. mixing the solutions obtained in the step 1 and the step 2, and heating to 40 ℃ under the condition of stirring to form a mixed solution; 4. mixing calcium chloride with a proper amount of deionized water, and strongly stirring to prepare a calcium chloride aqueous solution with the mass percentage of 50%; 5. adding the calcium chloride aqueous solution into the mixed solution obtained in the step (3), and continuously stirring and reacting for 5 hours at 40 ℃ to form a slurry solution; 6. then adding a proper amount of ethanol and polyethylene glycol (molecular weight 4000) into the slurry solution in sequence, stirring until the mixture is uniformly mixed, then adding the pesticide abamectin and the bactericide sucrose ester, uniformly stirring and discharging to obtain the nano sun-screening agent. According to the percentage (100) of the total weight of the feed, the components comprise 0.4 percent of sodium polyacrylate, 28 percent of sodium carbonate, 28 percent of calcium chloride, 2.5 percent of ethanol, 1.5 percent of glycol, 0.8 percent of abamectin, 0.8 percent of sucrose ester and the balance of deionized water.
Example 6
A preparation method of a citrus sunscreen agent comprises the following steps:
1. adding a certain amount of sodium polyacrylate (with molecular weight of 5000) into a proper amount of deionized water, and stirring until the sodium polyacrylate is completely dissolved to prepare a solution; 2. mixing sodium carbonate and a proper amount of deionized water, and strongly stirring to prepare a sodium carbonate aqueous solution with the mass percentage of 50%; 3. mixing the solutions obtained in the step 1 and the step 2, and heating to 40 ℃ under the condition of stirring to form a mixed solution; 4. mixing calcium chloride with a proper amount of deionized water, and strongly stirring to prepare a calcium chloride aqueous solution with the mass percentage of 50%; 5. adding the calcium chloride aqueous solution into the mixed solution obtained in the step (3), and continuously stirring and reacting for 5 hours at 40 ℃ to form a slurry solution; 6. then adding a proper amount of ethanol and polyethylene glycol (molecular weight 4000) into the slurry solution in sequence, stirring until the mixture is uniformly mixed, then adding the pesticide abamectin and the bactericide sucrose ester, uniformly stirring and discharging to obtain the nano sun-screening agent. According to the percentage (100) of the total weight of the feed, the components comprise 0.4 percent of sodium polyacrylate, 28 percent of sodium carbonate, 28 percent of calcium chloride, 2.5 percent of ethanol, 1.5 percent of glycol, 1 percent of abamectin, 1 percent of sucrose ester and the balance of deionized water.
Example 7
A preparation method of a citrus sunscreen agent comprises the following steps:
1. adding a certain amount of sodium polyacrylate (with molecular weight of 5000) into a proper amount of deionized water, and stirring until the sodium polyacrylate is completely dissolved to prepare a solution; 2. mixing sodium carbonate and a proper amount of deionized water, and strongly stirring to prepare a sodium carbonate aqueous solution with the mass percentage of 50%; 3. mixing the solutions obtained in the step 1 and the step 2, and heating to 40 ℃ under the condition of stirring to form a mixed solution; 4. mixing calcium chloride with a proper amount of deionized water, and strongly stirring to prepare a calcium chloride aqueous solution with the mass percentage of 50%; 5. adding the calcium chloride aqueous solution into the mixed solution obtained in the step (3), and continuously stirring and reacting for 5 hours at 40 ℃ to form a slurry solution; 6. then adding a proper amount of ethanol and polyethylene glycol (molecular weight 4000) into the slurry solution in sequence, stirring until the mixture is uniformly mixed, then adding the tetramethrin insecticide and the potassium sorbate bactericide, stirring uniformly and discharging to obtain the nano sunscreen agent. According to the percentage (100) of the total weight of the components in the feed, the sodium polyacrylate is 0.4%, the sodium carbonate is 28%, the calcium chloride is 28%, the ethanol is 2.5%, the glycol is 1.5%, the tetramethrin is 0.5%, the potassium sorbate is 0.5%, and the balance is deionized water.
Example 8
A preparation method of a citrus sunscreen agent comprises the following steps:
1. adding a certain amount of sodium polyacrylate (with molecular weight of 5000) into a proper amount of deionized water, and stirring until the sodium polyacrylate is completely dissolved to prepare a solution; 2. mixing sodium carbonate and a proper amount of deionized water, and strongly stirring to prepare a sodium carbonate aqueous solution with the mass percentage of 50%; 3. mixing the solutions obtained in the step 1 and the step 2, and heating to 40 ℃ under the condition of stirring to form a mixed solution; 4. mixing calcium chloride with a proper amount of deionized water, and strongly stirring to prepare a calcium chloride aqueous solution with the mass percentage of 50%; 5. adding the calcium chloride aqueous solution into the mixed solution obtained in the step (3), and continuously stirring and reacting for 5 hours at 40 ℃ to form a slurry solution; 6. then adding a proper amount of ethanol and polyethylene glycol (molecular weight 4000) into the slurry solution in sequence, stirring until the mixture is uniformly mixed, then adding the tetramethrin insecticide and the potassium sorbate bactericide, stirring uniformly and discharging to obtain the nano sunscreen agent. According to the percentage (100) of the total weight of the components in the feed, the sodium polyacrylate is 0.4%, the sodium carbonate is 28%, the calcium chloride is 28%, the ethanol is 2.5%, the glycol is 1.5%, the tetramethrin is 0.8%, the potassium sorbate is 0.8%, and the balance is deionized water.
Example 9
A preparation method of a citrus sunscreen agent comprises the following steps:
1. adding a certain amount of sodium polyacrylate (with molecular weight of 5000) into a proper amount of deionized water, and stirring until the sodium polyacrylate is completely dissolved to prepare a solution; 2. mixing sodium carbonate and a proper amount of deionized water, and strongly stirring to prepare a sodium carbonate aqueous solution with the mass percentage of 50%; 3. mixing the solutions obtained in the step 1 and the step 2, and heating to 40 ℃ under the condition of stirring to form a mixed solution; 4. mixing calcium chloride with a proper amount of deionized water, and strongly stirring to prepare a calcium chloride aqueous solution with the mass percentage of 50%; 5. adding the calcium chloride aqueous solution into the mixed solution obtained in the step (3), and continuously stirring and reacting for 5 hours at 40 ℃ to form a slurry solution; 6. then adding a proper amount of ethanol and polyethylene glycol (molecular weight 4000) into the slurry solution in sequence, stirring until the mixture is uniformly mixed, then adding the tetramethrin insecticide and the potassium sorbate bactericide, stirring uniformly and discharging to obtain the nano sunscreen agent. According to the percentage (100) of the total weight of the components in the feeding material, the sodium polyacrylate is 0.4%, the sodium carbonate is 28%, the calcium chloride is 28%, the ethanol is 2.5%, the glycol is 1.5%, the tetramethrin is 1%, the potassium sorbate is 1%, and the balance is deionized water.
When the sunscreen agent is applied to citrus control, the comparison effects are as follows:
the external temperature of the test is selected to be 35-40 ℃, the high temperature is kept for 10-20 days, and the test site Jiangsu is selected. The standard for judging the number of the sunscald citrus plants is as follows: the pericarp of the damaged part appears yellow brown, the growth of the pericarp is stopped, the surface is thickened and the quality is hard; or cracks occur, and the diseased part is flat, so that the fruits are deformed; or the burnt part causes the juice cells to be dry and dry, the juice is little, and the taste is very light. If the number of the fruits generating the symptoms of the sunscald disease accounts for more than 20-40% of the number of the fruits of the whole plant, the citrus plants with the sunscald disease are obtained, blank groups are not treated, the formulas of the examples 1-9 are adopted in the numbers 1-9, and the comparative experiment results are shown in the table I.
Watch 1
Note: sunscald incidence (%) = sunscald citrus tree/total citrus tree/
From the results of the experimental comparison of table one, it can be seen that: sunscald of citrus coated with the sunscreen of the present invention is about 1/20-1/10 of the incidence of citrus not coated with sunscreen, with the incidence being greatly reduced. Therefore, the novel sun-screening agent of the invention not only solves the problems of the existing sun-screening agent, but also has good sun-screening effect, simple preparation method and low cost.
The above are only preferred embodiments of the present invention, and the scope of the present invention shall be defined by the appended claims.
Claims (4)
1. The preparation method of the citrus sun-screening agent is characterized by comprising the following steps:
(1) adding a certain amount of sodium polyacrylate (with molecular weight of 5000) into a proper amount of deionized water, and stirring until the sodium polyacrylate is completely dissolved to prepare a solution; (2) mixing sodium carbonate and a proper amount of deionized water, and strongly stirring to prepare a sodium carbonate aqueous solution with the mass percentage of 50%; (3) mixing the solutions obtained in the step 1 and the step 2, and heating to 40 ℃ under the condition of stirring to form a mixed solution; (4) mixing calcium chloride with a proper amount of deionized water, and strongly stirring to prepare a calcium chloride aqueous solution with the mass percentage of 50%; (5) adding the calcium chloride aqueous solution into the mixed solution obtained in the step (3), and continuously stirring and reacting for 5 hours at 40 ℃ to form a slurry solution; (6) then adding a proper amount of ethanol and polyethylene glycol (molecular weight 4000) into the slurry solution in sequence, stirring until the mixture is uniformly mixed, and discharging to obtain the nano sunscreen agent; when the materials are fed, the sodium polyacrylate, the sodium carbonate, the calcium chloride, the ethanol, the ethylene glycol and the deionized water respectively account for 0.2-0.5%, 25-30%, 2-3%, 1-2% and the balance of the deionized water of the total weight (100%) of the materials.
2. A process for preparing a citrus sunscreen according to claim 1 wherein an insecticide (0.5 to 1% by weight) is added in step 6, the insecticide being one of avermectin and tetramethrin.
3. A process for preparing a citrus sunscreen according to claim 1 wherein step 6 includes adding a biocide (0.5 to 1% by weight) selected from sucrose esters and potassium sorbate.
4. A citrus sunscreen obtained according to the method of producing a citrus sunscreen according to any of claims 1 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010262056.XA CN113491274A (en) | 2020-04-06 | 2020-04-06 | Citrus sunscreen and preparation method thereof |
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| CN1736218A (en) * | 2005-05-13 | 2006-02-22 | 河北科技大学 | Application of high molecular polymer emulsion film in protection film for fruit growth |
| WO2009064450A1 (en) * | 2007-11-16 | 2009-05-22 | Purfresh, Inc. | Sunscreen formulations for use in the production of organic crops |
| CN108587331A (en) * | 2018-03-30 | 2018-09-28 | 王建东 | A kind of special white-out agent of citrus fruit |
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|---|---|---|---|---|
| CN1736218A (en) * | 2005-05-13 | 2006-02-22 | 河北科技大学 | Application of high molecular polymer emulsion film in protection film for fruit growth |
| WO2009064450A1 (en) * | 2007-11-16 | 2009-05-22 | Purfresh, Inc. | Sunscreen formulations for use in the production of organic crops |
| CN108587331A (en) * | 2018-03-30 | 2018-09-28 | 王建东 | A kind of special white-out agent of citrus fruit |
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| 《中国化学会第十六届胶体与界面化学会议》编委会 编: "《中国化学会第十六届胶体与界面化学会议论文集》", 31 July 2017, 中国石油大学出版社 * |
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