Plant growth promoting fire retardant material, method of making and use thereof

Abstract

This invention relates to the field of agricultural technology, and in particular to a plant growth-promoting and sun-protecting material, its preparation method, and its application. The plant growth-promoting and sun-protecting material comprises the following components by mass percentage: 30%–50% film-forming substance, 0.001%–2.05% film-forming aid, 0.001%–0.15% defoamer, 0.1%–5% light-converting agent, 0.01%–5% iron ion complex, 0.001%–0.1% trace element complex, 0.01%–0.1% spreading agent, 0%–0.05% antibacterial agent, and the balance being water. The light-converting agent includes blue carbon dot material with an absorption peak of 300–350 nm and an emission peak of 450–480 nm. The finished product obtained by the combination of these components absorbs high-energy ultraviolet light to weaken the sun's scorching effect, and converts ultraviolet light into blue light, effectively promoting photosynthesis and plant growth.

Description

Technical Field

[0001] This invention relates to the field of agricultural technology, and in particular to a plant growth-promoting and scorching-preventing material, its preparation method, and its application. Background Technology

[0002] Plants need photosynthesis to grow, but for most plants, only blue and red light in sunlight is used for photosynthesis. High-energy ultraviolet light cannot be used for photosynthesis, and in fact, it can cause sunburn and scorching in intense sunlight. To prevent sunburn and scorching of plants (especially economically important plants), common practices include covering them with physical films (shade nets, etc.) or artificially whitewashing them. Physical films easily cause white pollution and are costly. Artificial whitewashing is effective in preventing sunburn but affects photosynthesis. Furthermore, whitewashing affects the appearance of economically important crops and requires subsequent cleaning.

[0003] Currently, there are technical reports on the use of materials such as nano zinc oxide, nano titanium dioxide, and sodium salicylate to prepare liquid sunscreens for plants. However, the raw material costs are high. Nano titanium dioxide has strong photocatalytic properties, but there is no clear research data reported on its effects on plants and fruits without surface modification.

[0004] In view of this, the present invention is hereby proposed. Summary of the Invention

[0005] One object of the present invention is to provide a plant growth-promoting and sun-protecting material that can convert ultraviolet light into blue light that promotes photosynthesis, thereby not only achieving sun protection but also promoting plant growth.

[0006] Another aspect of the present invention provides a method for preparing a plant growth-promoting and scorching-preventing material.

[0007] Another aspect of the present invention provides the application of plant growth-promoting and scorching-preventing materials in promoting plant growth and / or preventing scorching.

[0008] To achieve the above-mentioned objectives of the present invention, one aspect of the present invention provides a plant growth-promoting and sun-protecting material, comprising the following components by mass percentage:

[0009] Film-forming substance 30%–50%, film-forming aid 0.001%–2.05%, defoamer 0.001%–0.15%, phototransfer agent 0.1%–5%, iron ion complex 0.01%–5%, trace element complex 0.001%–0.1%, spreading agent 0.01%–0.1%, antibacterial agent 0%–0.05%, and balance water;

[0010] The light transfer agent includes blue carbon dot material, which has an absorption peak of 300-350 nm and an emission peak of 450-480 nm.

[0011] In a specific embodiment of the present invention, the mass ratio of the light conversion agent to the iron ion complex is 1:(0.5-2).

[0012] In a specific embodiment of the present invention, the iron ion complex includes at least one of iron citrate and EDTA iron complex.

[0013] In a specific embodiment of the present invention, the film-forming substance includes at least one selected from polyacrylic acid, polyacrylate, polyethylene glycol, polyvinyl alcohol, paraffin, sodium carboxymethyl cellulose, hydroxymethyl cellulose, hydroxypropyl cellulose, chitosan, and starch.

[0014] In a specific embodiment of the present invention, the film-forming aid includes at least one of glycerol, propylene glycol, acetone glycerol, propylene glycol methyl ether acetate, and dodecyl alcohol ester.

[0015] In a specific embodiment of the present invention, the defoamer includes at least one of polysiloxane defoamers and polyether-modified siloxane defoamers.

[0016] In a specific embodiment of the present invention, the trace element complex includes at least one of a citric acid complex of trace elements and an EDTA complex of trace elements; the trace element is at least one of copper, magnesium, calcium and zinc.

[0017] In a specific embodiment of the present invention, the spreading agent is an organosilicon spreading agent.

[0018] In a specific embodiment of the present invention, the antibacterial agent includes at least one of chitosan-type antibacterial agents, imidacloprid, and diphenhydramine.

[0019] In a specific embodiment of the present invention, the blue light carbon dot material is mainly prepared by reacting urea and citric acid in an aqueous system under high pressure. Further, the reaction temperature is 200–235°C, and the reaction time is 1–4 hours.

[0020] In a specific embodiment of the present invention, the mass ratio of urea to citric acid is 1:(0.5-1.5).

[0021] In a specific embodiment of the present invention, the amount of water used is 8 to 12 times the combined mass of the urea and the citric acid.

[0022] Another aspect of the present invention provides a method for preparing any one of the above-described plant growth-promoting and sun-protecting materials, comprising the following steps:

[0023] (a) The film-forming substance, film-forming aid, trace element complex, spreading agent and antibacterial agent are homogenized and dispersed, and then the defoamer is added and mixed evenly;

[0024] (b) The light conversion agent, iron ion complex and water are mixed evenly and added to the material obtained in step (a) and mixed evenly.

[0025] In a specific embodiment of the present invention, in step (a), the homogenization dispersion process is carried out at a stirring speed of 500 to 10000 rpm and a processing time of 2 to 20 min.

[0026] In another aspect, the present invention provides the application of any of the above-described plant growth-promoting and scorching-preventing materials in promoting plant growth and / or preventing scorching.

[0027] In a specific embodiment of the present invention, the method of using the plant growth-promoting and anti-scalding material includes: diluting the plant growth-promoting and anti-scalding material 20 to 200 times and spraying it on the leaves and / or fruits of the plants to be treated.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] (1) The plant growth-promoting and sun-protecting material of the present invention, through the combination of its components, absorbs high-energy ultraviolet light to weaken the sun-scorching problem on the one hand, and converts ultraviolet light into blue light on the other hand, which can effectively promote the photosynthesis of plants and promote plant growth.

[0030] (2) The plant growth-promoting and anti-scalding material of the present invention can form a certain elastic physical film on the surface of leaves or fruits, which can reduce transpiration, block some pests and diseases, and improve the physiological stress resistance of plants; at the same time, the anti-scalding material of the present invention has durability and rain washout resistance after film formation.

[0031] (3) The preparation process of the plant growth-promoting and anti-scalding material of the present invention is simple, the conditions are mild, and the raw materials are non-toxic, safe and environmentally friendly. Attached Figure Description

[0032] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 Comparative photographs of sunflowers after applying antiscalding liquids from different embodiments and comparative examples;

[0034] Figure 2 This is a comparison diagram of the effect of the anti-scalding liquid of Embodiment 1 of the present invention on a single blade;

[0035] Figure 3Comparison photos of spinach with the anti-scalding liquid of Example 1 of the present invention and commercially available spinach. Detailed Implementation

[0036] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. However, those skilled in the art will understand that the embodiments described below are some embodiments of the present invention, but not all embodiments, and are only used to illustrate the present invention, and should not be regarded as limiting the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall be followed. Where the manufacturers of reagents or instruments are not specified, they are all conventional products that can be purchased commercially.

[0037] This invention provides a plant growth-promoting and sun-protecting material, comprising the following components by mass percentage:

[0038] Film-forming substance 30%–50%, film-forming aid 0.001%–2.05%, defoamer 0.001%–0.15%, phototransfer agent 0.1%–5%, iron ion complex 0.01%–5%, trace element complex 0.001%–0.1%, spreading agent 0.01%–0.1%, antibacterial agent 0%–0.05%, and balance water;

[0039] The light transfer agent includes blue carbon dot materials, which have an absorption peak of 300–350 nm and an emission peak of 450–480 nm.

[0040] The plant growth-promoting and sun-protecting material of this invention, through the combination of its components, absorbs high-energy ultraviolet light to weaken the scorching problem of sunlight, and converts ultraviolet light into blue light, effectively promoting photosynthesis and plant growth. This material can form a relatively elastic physical film on the surface of leaves or fruits, reducing transpiration, blocking some pests and diseases, and improving the plant's physiological resistance. Furthermore, the film formed by this material is durable and resistant to rain erosion.

[0041] In different embodiments, the amounts of each component in the plant growth-promoting and sun-protecting material of the present invention, by mass percentage, are as follows:

[0042] The mass percentage of the film-forming substance can be 30%, 32%, 35%, 40%, 42%, 45%, 50%, or any two of these ranges; the film-forming substance can be added in the form of emulsion, etc., and the amount of film-forming substance used is calculated based on its solid content, with the remainder included in the calculation of water content;

[0043] The mass percentage of the film-forming aid can be 0.001%, 0.1%, 0.5%, 1%, 1.5%, 2%, 2.05%, or any combination thereof;

[0044] The mass percentage of the defoamer can be 0.001%, 0.005%, 0.01%, 0.05%, 0.08%, 0.1%, 0.15%, or any combination thereof;

[0045] The mass percentage of the light transfer agent can be 0.1%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, or any combination thereof;

[0046] The mass percentage of the iron ion complex can be 0.01%, 0.05%, 0.1%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, or any two of these components.

[0047] The mass percentage of the trace element complex can be 0.001%, 0.005%, 0.01%, 0.05%, 0.1%, or any two of these components.

[0048] The mass percentage of the spreading agent can be within the range of 0.01%, 0.02%, 0.05%, 0.08%, 0.1%, or any combination thereof;

[0049] The mass percentage of the antibacterial agent can be 0%, 0.01%, 0.02%, 0.05%, or any combination thereof.

[0050] In a specific embodiment of the present invention, the mass ratio of the light conversion agent to the iron ion complex is 1:(0.5-2).

[0051] In different embodiments, the mass ratio of the light conversion agent to the iron ion complex can be 1:0.5, 1:0.8, 1:1, 1:1.2, 1:1.5, 1:1.8, 1:2, or any combination thereof. The iron ion complex has a certain light-shielding effect; its addition can block some sunlight, reducing the scorching effect on plants. The light conversion agent can convert ultraviolet light in sunlight into blue light, promoting plant photosynthesis. This invention controls the ratio of the two within the above range to avoid excessive sunlight shielding, allowing the light conversion agent to convert ultraviolet light into usable blue light, thereby promoting plant photosynthesis and growth.

[0052] In a specific embodiment of the present invention, the film-forming substance includes at least one of polyacrylic acid, polyacrylate, polyethylene glycol, polyvinyl alcohol, paraffin, sodium carboxymethyl cellulose, hydroxymethyl cellulose, hydroxypropyl cellulose, chitosan, and starch.

[0053] The plant growth-promoting and sun-protecting material of this invention uses a certain film-forming substance, combined with other components, to form a physical film with a certain elasticity on the surface of leaves and fruits, reducing transpiration and blocking some pests and diseases. The film-forming substance used in this invention exists in the final sun-protecting material product in a water-soluble or emulsion state. In the emulsion state, it can be emulsified with nonionic surfactants or nonionic emulsions, and does not contain APEO.

[0054] In a specific embodiment of the present invention, the film-forming aid includes at least one of glycerol, propylene glycol, acetone glycerol, propylene glycol methyl ether acetate, and dodecyl alcohol ester.

[0055] In a specific embodiment of the present invention, the defoamer includes at least one of polysiloxane defoamers and polyether-modified siloxane defoamers.

[0056] In a specific embodiment of the present invention, the iron ion complex includes at least one of iron citrate and EDTA iron complex.

[0057] In a specific embodiment of the present invention, the trace element complex includes at least one of a citric acid complex of trace elements and an EDTA complex of trace elements; the trace element is at least one of copper, magnesium, calcium and zinc.

[0058] In a specific embodiment of the present invention, the spreading agent is an organosilicon-type spreading agent.

[0059] In a specific embodiment of the present invention, the antibacterial agent includes at least one of chitosan-type antibacterial agents, imazalil, and acetamiprid.

[0060] In a specific embodiment of the present invention, the blue carbon dot material is mainly prepared by reacting urea and citric acid in an aqueous system under high pressure. Furthermore, the reaction temperature is 200–235°C, and the reaction time is 1–4 hours.

[0061] In different implementation methods, the reaction temperature can be 200℃, 210℃, 220℃, 230℃, 235℃, or any combination thereof, and the reaction time can be 1h, 2h, 3h, 4h, etc. In actual operation, the reaction of urea and citric acid in the preparation of blue carbon dot materials can be carried out in a reaction vessel, and the high pressure conditions can be adjusted according to the actual situation to make the reaction temperature of the system reach the preset temperature.

[0062] In a specific embodiment of the present invention, the mass ratio of urea to citric acid is 1:(0.5 to 1.5).

[0063] In different embodiments, the mass ratio of urea to citric acid can be 1:0.5, 1:0.8, 1:1, 1:1.2, 1:1.5, or any combination thereof.

[0064] In a specific embodiment of the present invention, the amount of water used is 8 to 12 times the combined mass of urea and citric acid.

[0065] In different embodiments, the amount of water used can be 8, 9, 10, 11, 12 times the combined mass of urea and citric acid, or any combination thereof.

[0066] Another aspect of the present invention provides a method for preparing any of the above-mentioned plant growth-promoting and sun-protecting materials, comprising the following steps:

[0067] (a) The film-forming substance, film-forming aid, trace element complex, spreading agent and antibacterial agent are homogenized and dispersed, and then the defoamer is added and mixed evenly;

[0068] (b) The light conversion agent, iron ion complex and water are mixed evenly and added to the material obtained in step (a) and mixed evenly.

[0069] In a specific embodiment of the present invention, in step (a), the stirring speed is 500 to 10000 rpm and the processing time is 2 to 20 min during the homogenization and dispersion treatment.

[0070] In homogenization and dispersion, the stirring speed and processing time can be adjusted according to the actual situation to ensure that the materials are mixed evenly.

[0071] In another aspect, the present invention provides the application of any of the above-mentioned plant growth-promoting and scorching-preventing materials in promoting plant growth and / or preventing scorching.

[0072] In a specific embodiment of the present invention, the method of using the plant growth-promoting and anti-scalding material includes: diluting the plant growth-promoting and anti-scalding material 20 to 200 times and spraying it on the leaves and / or fruits of the plants to be treated.

[0073] Among them, plant growth-promoting and anti-scalding materials can be diluted to a range of 20 times, 50 times, 80 times, 100 times, 120 times, 150 times, 180 times, 200 times, or any combination thereof.

[0074] The plants used in this invention may include, but are not limited to, sunflowers, green plants (such as pothos), and vegetables (such as spinach).

[0075] Example 1

[0076] This embodiment provides a plant growth-promoting and anti-scalding liquid, which is mainly prepared from the following components:

[0077] Film-forming substance LW102 (Tianshi) emulsion 30kg (solid content 47wt%), glycerol 0.002kg, acetone glyceryl chloride 0.005kg, polydimethylsiloxane 0.005kg, phototransfer agent 0.4kg, ferric citrate 0.4kg, citrate (including calcium citrate, magnesium citrate, zinc citrate, and copper citrate in a mass ratio of 100:48:0.1:0.1) 0.01kg, silicone spreading agent (MY2000) 0.015kg, chitosan 0.01kg, and water 1kg.

[0078] The preparation method of the phototransfer agent includes: adding 1.5 kg of citric acid and 1.5 kg of urea to a high-pressure reactor, dissolving them in 30 kg of water, heating to 230°C, reacting for 1 hour, cooling to room temperature, filtering to remove crystals and precipitates, and then concentrating under reduced pressure to 1 / 6 of the original volume for later use.

[0079] The preparation method of the plant growth-promoting and anti-scalding solution in this embodiment includes the following steps:

[0080] (1) Add film-forming substance, glycerol, acetone glycerol, citrate, silicone spreading agent and chitosan to a stirred tank, and homogenize at 500 rpm for 20 min. Before the end of the dispersion, add polydimethylsiloxane and stir evenly. Set aside for later use.

[0081] (2) Dissolve the light conversion agent, ferric citrate and water by stirring and mixing them evenly. Then add them to the material obtained in step (1) under stirring conditions, stir for 10 minutes, and fill them to obtain the plant growth-promoting and anti-scalding liquid product A.

[0082] Example 2

[0083] This embodiment refers to the plant growth-promoting and anti-scalding liquid and its preparation method in Example 1, with the only difference being the amount of each component.

[0084] The plant growth-promoting and anti-scalding solution of this embodiment is mainly prepared from the following components:

[0085] The film-forming substance LW102 (Tianshi) emulsion 50kg (solid content 47wt%), glycerol 0.94kg, acetone glyceryl chloride 0.005kg, polydimethylsiloxane 0.0705kg, phototransfer agent 0.047kg, ferric citrate 0.0047kg, citrate 0.047kg, silicone spreading agent 0.047kg, chitosan 0.0235kg and water 1kg.

[0086] Example 3

[0087] This embodiment refers to the plant growth-promoting and anti-scalding liquid and its preparation method in Example 1, with the only difference being the amount of each component.

[0088] The plant growth-promoting and anti-scalding solution of this embodiment is mainly prepared from the following components:

[0089] The film-forming substance LW102 (Tianshi) emulsion 40kg (solid content 47wt%), glycerol 0.00047kg, polydimethylsiloxane 0.00047kg, phototransfer agent 2.35kg, ferric citrate 2.35kg, citrate 0.00047kg, silicone spreading agent 0.0047kg and water 1kg.

[0090] Example 4

[0091] This embodiment refers to the plant growth-promoting and anti-scalding liquid and its preparation method in Example 1, with the only difference being the amount of light conversion agent and ferric citrate used.

[0092] In this embodiment, 0.53 kg of light transfer agent and 0.27 kg of ferric citrate were used.

[0093] Example 5

[0094] This embodiment refers to the plant growth-promoting and anti-scalding liquid and its preparation method in Example 1, with the only difference being the amount of light conversion agent and ferric citrate used.

[0095] In this embodiment, 0.27 kg of light transfer agent and 0.53 kg of ferric citrate were used.

[0096] Example 6

[0097] This embodiment refers to the plant growth-promoting and anti-scalding liquid and its preparation method in Example 1, with the only difference being the amount of light conversion agent and ferric citrate used.

[0098] In this embodiment, 0.6 kg of light transfer agent and 0.2 kg of ferric citrate were used.

[0099] Example 7

[0100] This embodiment refers to the plant growth-promoting and anti-scalding liquid and its preparation method in Example 1, with the only difference being the amount of light conversion agent and ferric citrate used.

[0101] In this embodiment, 0.2 kg of light transfer agent and 0.6 kg of ferric citrate were used.

[0102] Example 8

[0103] This embodiment refers to the plant growth-promoting and anti-scalding liquid and its preparation method in Example 1, with the only difference being the preparation method of the light conversion agent.

[0104] The preparation method of the phototransfer agent in this embodiment includes: adding 1 kg of citric acid and 2 kg of urea to a high-pressure reactor, dissolving them in 30 kg of water, heating to 230°C, reacting for 1 hour, cooling to room temperature, filtering to remove crystals and precipitates, and then concentrating under reduced pressure to 1 / 6 of the original volume for later use.

[0105] Example 9

[0106] This embodiment refers to the plant growth-promoting and anti-scalding liquid and its preparation method in Example 1, with the only difference being the preparation method of the light conversion agent.

[0107] The preparation method of the phototransfer agent in this embodiment includes: adding 1.8 kg of citric acid and 1.2 kg of urea to a high-pressure reactor, dissolving them in 30 kg of water, heating to 230°C, reacting for 1 hour, cooling to room temperature, filtering to remove crystals and precipitates, and then concentrating under reduced pressure to 1 / 6 of the original volume for later use.

[0108] Comparative Example 1

[0109] Comparative Example 1 refers to the plant growth-promoting and anti-scalding liquid and its preparation method in Example 1, the difference being that: no light conversion agent is added in Comparative Example 1, and the amount of light conversion agent is partially made up with water.

[0110] Comparative Example 2

[0111] Comparative Example 1 refers to the plant growth-promoting and anti-scalding liquid and its preparation method in Example 1, the difference being that: ferric citrate is not added in Comparative Example 1, and the amount of ferric citrate is partially made up with water.

[0112] Experimental Example 1

[0113] To compare the effects of the finished products from different embodiments and comparative examples, the following methods were used. The finished products from Examples 1-9 and Comparative Examples 1-2, as well as commercially available product 1 (emulsion) and commercially available product 2 (clear solution), were diluted 50 times and uniformly sprayed onto sunflower seedlings under the same conditions. During the experiment, the daytime temperature exceeded 35°C, and two rainstorms occurred. One additional spray was applied in between. Growth was compared after 37 days. Figure 1 The table shows photographic comparisons of the following groups: the unsprayed blank group, the finished product A group sprayed with product A from Example 1, the commercially available product 1 group sprayed with commercially available product 1, the commercially available product 2 group sprayed with commercially available product 2, the control sample 1 group sprayed with the finished product from Comparative Example 1, and the control sample 2 group sprayed with the finished product from Comparative Example 2. Table 1 shows the test data for each group after 37 days of spraying treatment.

[0114] Table 1. Growth data of sunflower plants in different groups

[0115]

[0116]

[0117] Note: Within 37 days, there will be 21 sunny or cloudy days and 16 rainy days.

[0118] The test results above show that the plant growth-promoting and scorching-preventing material of the present invention significantly improves the plant height of sunflower seedlings compared with the comparative example and commercially available products.

[0119] Experiment Example 2

[0120] Take the finished product from Example 1, dilute it 20 times, and spray it on the leaves of green plants (Green Luo). Cover one side of the leaf and spray only the other side. Indoor application rate: 100-150 mW / m 2 Irradiate the leaves with ultraviolet light for 48 hours, and compare the results of spraying and not spraying. Figure 2 As can be seen, the unsprayed side withered after 48 hours, while the sprayed side showed a significant protective effect.

[0121] Experimental Example 3

[0122] Take Example 1 and commercially available product 1 (emulsion) respectively, dilute them 30 times, and spray them evenly under the same conditions during the growth period of spinach. During the experiment, the daytime temperature exceeded 35°C. After 60 days, the growth was compared. Figure 3 The images show a comparison of photographs of the untreated control group, the finished product group sprayed with product A from Example 1, and the commercially available group sprayed with product 1. As can be seen from the images, the spinach sprayed with the plant growth promoter and anti-scalding liquid of the present invention is significantly more vigorous than the control group.

[0123] As can be seen from the above test results, the plant growth-promoting and sun-protecting material of the present invention, through the combination of its components, can absorb high-energy ultraviolet light to weaken the sunburn problem on the one hand, and convert ultraviolet light into blue light on the other hand, which can effectively promote plant photosynthesis and promote plant growth.

[0124] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A plant growth-promoting and sun-protecting material, characterized in that, Includes the following components by mass percentage: Film-forming substance 30%–50%, film-forming aid 0.001%–2.05%, defoamer 0.001%–0.15%, phototransfer agent 0.1%–5%, iron ion complex 0.01%–5%, trace element complex 0.001%–0.1%, spreading agent 0.01%–0.1%, antibacterial agent 0%–0.05%, and balance water; The light conversion agent includes a blue carbon dot material, which has an absorption peak of 300–350 nm and an emission peak of 450–480 nm. The blue carbon dot material is prepared by reacting urea and citric acid in an aqueous system under high pressure. The reaction temperature is 200–235 °C and the reaction time is 1–4 h. The film-forming substance is at least one selected from polyacrylic acid, polyacrylate, polyethylene glycol, polyvinyl alcohol, paraffin, sodium carboxymethyl cellulose, hydroxymethyl cellulose, hydroxypropyl cellulose, chitosan, and starch. The iron ion complex includes at least one of iron citrate and EDTA iron complex.

2. The plant growth-promoting and sun-protecting material according to claim 1, characterized in that, The mass ratio of the light transfer agent to the iron ion complex is 1:(0.5-2).

3. The plant growth-promoting and sun-protecting material according to claim 1, characterized in that, It has at least one of the following characteristics: (1) The film-forming aid includes at least one of glycerol, propylene glycol, acetone glycerol, propylene glycol methyl ether acetate and dodecyl alcohol ester; (2) The defoamer includes at least one of polysiloxane defoamers and polyether-modified siloxane defoamers; (3) The trace element complex includes at least one of the trace element citric acid complex and the trace element EDTA complex; the trace element is at least one of copper, magnesium, calcium and zinc; (4) The spreading agent is an organosilicon spreading agent; (5) The antibacterial agent includes at least one of chitosan-type antibacterial agents, imidacloprid and acetamiprid.

4. The plant growth-promoting and sun-protecting material according to claim 1, characterized in that, The mass ratio of urea to citric acid is 1:(0.5-1.5). In the preparation process of the blue light carbon dot material, the amount of water used is 8 to 12 times the combined mass of the urea and the citric acid.

5. The method for preparing the plant growth-promoting and scorching-preventing material according to any one of claims 1 to 4, characterized in that, Includes the following steps: (a) The film-forming substance, film-forming aid, trace element complex, spreading agent and antibacterial agent are homogenized and dispersed, and then the defoamer is added and mixed evenly; (b) The light conversion agent, iron ion complex and water are mixed evenly and added to the material obtained in step (a) and mixed evenly.

6. The preparation method according to claim 5, characterized in that, In step (a), the homogenization and dispersion process involves a stirring speed of 500–10000 rpm and a processing time of 2–20 min.

7. The use of the plant growth-promoting and scorching-preventing material according to any one of claims 1 to 4 in promoting plant growth and / or preventing scorching.

8. The application according to claim 7, characterized in that, The method of using the plant growth-promoting and anti-scalding material includes: diluting the plant growth-promoting and anti-scalding material 20 to 200 times and spraying it on the leaves and / or fruits of the plants to be treated.

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