Bacteriostatic pollution-free green pesticide and preparation method thereof

Abstract

The invention relates to the technical field of pollution-free green pesticides, in particular to an antibacterial pollution-free green pesticide and a preparation method thereof.The pesticide is prepared from, by weight, 10%-30% of plant extract A, 5%-20% of plant extract B, 5%-15% of natural mineral powder, 3%-10% of natural antibacterial agent and 50%-70% of water or organic solvent. According to the invention, the pesticide is composed of the plant extract, the natural mineral powder and the natural antibacterial agent, is green, environment-friendly, pollution-free, free of environmental pollution and easy to degrade in soil and water sources, the plant extract is combined with the natural antibacterial agent to provide an efficient and broad-spectrum antibacterial effect, and in addition, the pesticide is low in toxicity, safe, harmless, suitable for popularization and use, low in production cost and suitable for popularization and application. The raw materials are easy to obtain, the preparation process is simple and convenient, large-scale application is facilitated, and meanwhile, the natural mineral powder contributes to adsorption and slow release and can provide trace elements and promote plant growth.

Description

Technical Field

[0001] The invention relates to the technical field of pollution-free green pesticides, and in particular to a pollution-free green pesticide capable of inhibiting bacteria and a preparation method thereof. Background Art

[0002] Traditional pesticides usually contain a large number of chemical synthetic ingredients, which will cause certain harm to the environment and human health during use. Therefore, research and development of safe, environmentally friendly and efficient new pesticides has become an urgent issue. In recent years, research on green pesticides has made certain progress, among which the application of natural ingredients such as plant extracts and microorganisms has received more and more attention. These natural pesticides usually have the advantages of low toxicity and easy degradation, but their activity is relatively weak and their action spectrum is relatively narrow, so further research and development is needed.

[0003] At present, the research on natural plant extracts for plant disease prevention and control is still in its early stages at home and abroad. Some studies have shown that plant extracts such as garlic, pepper, and neem have significant antibacterial activity. However, these plant extracts have limited efficacy when used alone, and there are problems such as high production costs and short storage time. How to improve the antibacterial activity of natural plant extracts, reduce costs, and make them more convenient for practical application remains an important challenge facing this field. Summary of the invention

[0004] The purpose of the present invention is to solve the technical problems raised in the above background technology.

[0005] The present invention adopts the following technical scheme: a pollution-free green pesticide capable of inhibiting bacteria, the pesticide is composed of the following components in weight percentage: plant extract A: 10-30%, plant extract B: 5-20%, natural mineral powder: 5-15%, natural antibacterial agent: 3-10%, water or organic solvent: 50-70%.

[0006] Further, the plant extract A is selected from one or more extracts of the following plants: garlic, pepper, neem, coptis root, ginkgo, wherein:

[0007] Garlic extract is preferably extracted from freshly peeled garlic to ensure that its active sulfide content is not less than 0.8%;

[0008] The pepper extract is preferably selected from red pepper varieties, and the extraction temperature is controlled at 60-70°C to obtain the best capsaicin content;

[0009] The neem extract is preferably extracted from the fruit of the neem tree and defatted to improve the stability and purity of the extract;

[0010] The Coptis chinensis extract is preferably extracted from the root of Coptis chinensis, and the berberine content in the extract should reach more than 90% to ensure its antibacterial effect;

[0011] Ginkgo extract preferably uses ginkgo leaves as raw materials, and ensures that the content of flavonoids therein reaches more than 24%.

[0012] Further, the plant extract B is selected from one or more extracts of the following plants: wormwood, tea tree, eucalyptus, thyme, mint, wherein:

[0013] The wormwood extract is preferably extracted from young leaves of wormwood and processed by low temperature drying to retain the activity of its volatile oil components;

[0014] The tea tree extract is preferably extracted from tea tree leaves, and the tea tree essential oil content in the extract should be more than 1.5% to ensure its antibacterial effect;

[0015] The eucalyptus extract is preferably extracted from leaves of Eucalyptus globulus or Eucalyptus camaldulensis, and the eucalyptus oil content is not less than 0.9%;

[0016] The thyme extract is preferably extracted from the flowers of thyme and an ethanol extraction process is used to retain its phenolic components;

[0017] The mint extract is preferably extracted from mint leaves and obtained by steam distillation, wherein the menthol content must be above 40%.

[0018] Furthermore, the natural mineral powder is sepiolite, bentonite or diatomaceous earth, wherein:

[0019] The preferred particle size of the sepiolite powder is 150-180 mesh to ensure its good dispersibility and adsorption capacity in the pesticide solution;

[0020] The bentonite is preferably sodium bentonite, the water absorption rate of which should be greater than 300%, and it should be subjected to high temperature treatment to improve its stability;

[0021] The diatomaceous earth is preferably high-purity natural diatomaceous earth with a particle size between 120-150 meshes to ensure its suspension effect in the solution.

[0022] Furthermore, the natural antibacterial agent is a biological antibacterial substance, such as chitosan, hesperidin or tea polyphenols, wherein:

[0023] Chitosan is preferably low molecular weight chitosan (molecular weight between 100-200 kDa) to improve its solubility and antibacterial activity;

[0024] Hesperidin is preferably extracted from fresh citrus peels, and the purity of the hesperidin is ensured to be no less than 95%;

[0025] Tea polyphenols are preferably extracted from green tea, and the tea polyphenol content in the extract is ensured to reach more than 98% to enhance the antioxidant and antibacterial effects.

[0026] A method for preparing a pollution-free green pesticide capable of inhibiting bacteria comprises the following steps:

[0027] S1: extracting the extracts of plants A and B respectively by ethanol, acetone or water, the extraction temperature is controlled at 60-80°C, the extraction time is 2-4 hours, the extract is filtered and concentrated to obtain plant extracts A and B;

[0028] S2: crush the natural mineral powder to a particle size of 100-200 mesh, and use a jet mill to evenly process it to ensure particle consistency;

[0029] S3: Add plant extract A, plant extract B, natural mineral powder and natural antibacterial agent into a blender in proportion, and mix at a speed of 300-500 rpm for 30-60 minutes to ensure sufficient mixing;

[0030] S4: dissolving the mixture in water or an organic solvent, stirring until uniformly dispersed, and maintaining the solution temperature between 25-35°C to avoid high temperature affecting the active ingredients;

[0031] S5: The final pesticide solution is processed by a 3000-5000 psi high pressure homogenizer to enhance the stability and suspension performance of the solution, and then filled into a finished product.

[0032] Furthermore, the solvent is distilled water or ethanol, wherein ethanol with a purity of more than 99% is preferably used to ensure the stability of the pesticide.

[0033] Furthermore, the extraction temperature of the plant extracts A and B is controlled between 60° C. and 80° C., and the extraction is performed under a vacuum environment to reduce oxidation losses and retain active ingredients.

[0034] Furthermore, during the preparation process of the pesticide, the pH value of the pesticide solution is adjusted to 5.5-7.5 by adding natural organic acid (such as citric acid) to enhance its antibacterial effect and plant compatibility.

[0035] Furthermore, in the step S4, a natural emulsifier (such as lecithin or xanthan gum) is added to improve the uniformity and stability of the pesticide solution, thereby ensuring that the pesticide is not easily precipitated during the application process.

[0036] Compared with the prior art, the advantages and positive effects of the present invention are:

[0037] In the present invention, the pesticide is composed of plant extracts, natural mineral powders and natural antibacterial agents, is green, environmentally friendly, pollution-free, will not pollute the environment, and is easily degraded in soil and water sources. Secondly, the plant extracts are combined with the natural antibacterial agents to provide efficient broad-spectrum antibacterial effects. In addition, the pesticide has low toxicity, is safe to use, is harmless to humans, animals and plants, and is suitable for widespread promotion in agricultural production. The production cost of the pesticide is low, the raw materials are easily available, the preparation process is simple, and it is suitable for large-scale application. At the same time, the natural mineral powder not only helps the adsorption and sustained release of the pesticide, but also provides trace elements for plants to promote their growth. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 The present invention provides a flow chart of a pollution-free green pesticide capable of inhibiting bacteria and a preparation method thereof. DETAILED DESCRIPTION

[0039] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0040] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0041] Embodiment 1

[0042] See also Figure 1 The present invention provides a technical solution: a pollution-free green pesticide capable of inhibiting bacteria, wherein the following raw materials are mixed by weight percentage: 20% garlic extract (plant extract A), 10% wormwood extract (plant extract B), 10% bentonite (natural mineral powder), 5% chitosan (natural antibacterial agent), and 55% distilled water. The specific preparation steps are as follows:

[0043] S1: Garlic and wormwood are extracted by ethanol respectively, the extraction temperature is controlled at 70°C, the extraction is performed for 3 hours, and the extract is filtered and concentrated to obtain concentrated extracts of garlic and wormwood;

[0044] S2: crushing bentonite to a particle size of 200 mesh to ensure uniform particle size, which helps to increase the dispersibility and adsorption of the pesticide solution;

[0045] S3: The plant extract, garlic extract and wormwood extract were fully mixed with bentonite and chitosan, and 55% distilled water was added. The stirring process was controlled at 300 rpm and the stirring was continued for 30 minutes to ensure that the components were evenly dispersed;

[0046] S4: The pH value of the solution is adjusted to 6.5, which helps to enhance the antibacterial effect and ensure the safety of plants;

[0047] S5: Filling the obtained pesticide solution to make a finished product.

[0048] Embodiment 2

[0049] See also Figure 1 , a pollution-free green pesticide that can inhibit bacteria, select the following raw materials: pepper extract (plant extract A) 15%, eucalyptus extract (plant extract B) 15%, diatomaceous earth (natural mineral powder) 8%, hesperidin (natural antibacterial agent) 4%, ethanol 58%. The specific steps are as follows:

[0050] S1: After the pepper and eucalyptus leaves are dried, they are extracted with ethanol solution respectively. The extraction temperature is controlled at 65°C and the extraction time is 4 hours. The extract is concentrated to a viscous state by vacuum distillation and set aside;

[0051] S2: Grind the diatomaceous earth to a particle size of 150 mesh to enhance the dispersion effect of the solution and provide adhesion to help the pesticide remain on the surface of the fruit tree for a longer time;

[0052] S3: Mix the plant extract, hesperidin and diatomaceous earth, and gradually add them into 58% ethanol solvent, control the stirring rate at 400 rpm, and stir for 40 minutes until a uniform green pesticide solution is formed;

[0053] S4: adjusting the pH value of the obtained solution to 7.0 so that it can adapt to the slightly acidic environment of fruit tree leaves and exert the best antibacterial effect;

[0054] S5: Filling the obtained pesticide solution to make a finished product.

[0055] Embodiment 3

[0056] See also Figure 1 , a pollution-free green pesticide that can inhibit bacteria, selected the following raw materials: 25% of Coptis chinensis extract (plant extract A), 10% of tea tree extract (plant extract B), 5% of sepiolite (natural mineral powder), 3% of tea polyphenols (natural antibacterial agent), and 57% of distilled water. The specific preparation process is as follows:

[0057] S1: extracting the dried powder of coptis chinensis and tea tree leaves with water, controlling the extraction temperature at 75°C for 3 hours, and concentrating the extract by filtration to obtain a concentrate of coptis chinensis and tea tree leaves;

[0058] S2: crush the sepiolite to a particle size of 100 mesh to ensure good dispersibility and strong adsorption;

[0059] S3: mixing plant extract A (Coptis chinensis) and plant extract B (Camellia sinensis) with sepiolite and tea polyphenols in proportion, and gradually adding 57% distilled water, controlling the stirring speed at 350 rpm, and stirring for 35 minutes;

[0060] S4: Adjusting the pH value of the pesticide solution to 6.0 helps to improve the antioxidant activity of tea polyphenols and optimize the stability of the pesticide;

[0061] S5: Filling the obtained pesticide solution to make a finished product.

[0062] Embodiment 4

[0063] See also Figure 1 , a pollution-free green pesticide that can inhibit bacteria, the following raw materials are selected: neem extract (plant extract A) 18%, peppermint extract (plant extract B) 12%, bentonite (natural mineral powder) 10%, chitosan (natural antibacterial agent) 5%, distilled water 55%. The preparation steps are as follows:

[0064] S1: The neem fruit and the mint leaf are dried and crushed respectively, and extracted with acetone solvent, the extraction temperature is controlled at 60°C, the extraction time is 2 hours, the extract is filtered to remove impurities, and then concentrated to a certain concentration by low-temperature vacuum to obtain the neem and mint extracts;

[0065] S2: Crush the bentonite to 200 mesh to ensure uniform particle size so that it can be evenly dispersed in the pesticide solution and enhance adhesion and slow-release effect;

[0066] S3: After mixing neem extract, peppermint extract, bentonite and chitosan in proportion, 55% of distilled water was gradually added, and the stirring process was controlled at 400 rpm for 40 minutes to allow the components to be fully dispersed and form a stable pesticide solution;

[0067] S4: The pH value of the pesticide solution is adjusted to 7.5 with a buffer solution to make it suitable for the growth environment of plants and help enhance the antibacterial properties of chitosan;

[0068] S5: Filling the obtained pesticide solution to make a finished product.

[0069] Experimental data summary table

[0070]

[0071] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A pollution-free green pesticide capable of inhibiting bacteria, characterized in that: The pesticide is composed of the following ingredients in percentage by weight Composition: Plant extract A: 10-30%, plant extract B: 5-20%, natural mineral powder: 5-15%, natural antibacterial agent: 3-10%, water or organic solvent: 50-70%.

2. The bacteriostatic and pollution-free green pesticide according to claim 1, characterized in that: The plant extract A is selected from one or more extracts of the following plants: garlic, pepper, neem, coptis root, ginkgo, wherein: Garlic extract is preferably extracted from freshly peeled garlic to ensure that its active sulfide content is not less than 0.8%; The pepper extract is preferably selected from red pepper varieties, and the extraction temperature is controlled at 60-70°C to obtain the best capsaicin content; The neem extract is preferably extracted from the fruit of the neem tree and defatted to improve the stability and purity of the extract; The Coptis chinensis extract is preferably extracted from the root of Coptis chinensis, and the berberine content in the extract should reach more than 90% to ensure its antibacterial effect; Ginkgo extract preferably uses ginkgo leaves as raw materials, and ensures that the content of flavonoids therein reaches more than 24%.

3. The bacteriostatic and pollution-free green pesticide according to claim 1, characterized in that: The plant extract B is selected from one or more extracts of the following plants: wormwood, tea tree, eucalyptus, thyme, mint, wherein: The wormwood extract is preferably extracted from young leaves of wormwood and processed by low temperature drying to retain the activity of its volatile oil components; The tea tree extract is preferably extracted from tea tree leaves, and the tea tree essential oil content in the extract should be more than 1.5% to ensure its antibacterial effect; The eucalyptus extract is preferably extracted from leaves of Eucalyptus globulus or Eucalyptus camaldulensis, and the eucalyptus oil content is not less than 0.9%; The thyme extract is preferably extracted from the flowers of thyme and an ethanol extraction process is used to retain its phenolic components; The mint extract is preferably extracted from mint leaves and obtained by steam distillation, wherein the menthol content must be above 40%.

4. The bacteriostatic and pollution-free green pesticide according to claim 1, characterized in that: The natural mineral powder is sepiolite, bentonite or diatomaceous earth, wherein: The preferred particle size of the sepiolite powder is 150-180 mesh to ensure its good dispersibility and adsorption capacity in the pesticide solution; The bentonite is preferably sodium bentonite, the water absorption rate of which should be greater than 300%, and it should be subjected to high temperature treatment to improve its stability; The diatomaceous earth is preferably high-purity natural diatomaceous earth with a particle size between 120-150 meshes to ensure its suspension effect in the solution.

5. The bacteriostatic and pollution-free green pesticide according to claim 1, characterized in that: The natural antibacterial agent is a biological antibacterial substance, such as chitosan, hesperidin or tea polyphenols, wherein: Chitosan is preferably low molecular weight chitosan (molecular weight between 100-200 kDa) to improve its solubility and antibacterial activity; Hesperidin is preferably extracted from fresh citrus peels, and the purity of the hesperidin is ensured to be no less than 95%; Tea polyphenols are preferably extracted from green tea, and the tea polyphenol content in the extract is ensured to reach more than 98% to enhance the antioxidant and antibacterial effects.

6. A method for preparing the bacteriostatic and pollution-free green pesticide according to claims 1-5, characterized in that: The following steps are involved: S1: extracting the extracts of plants A and B respectively by ethanol, acetone or water, the extraction temperature is controlled at 60-80°C, the extraction time is 2-4 hours, the extract is filtered and concentrated to obtain plant extracts A and B; S2: crush the natural mineral powder to a particle size of 100-200 mesh, and use a jet mill to evenly process it to ensure particle consistency; S3: Add plant extract A, plant extract B, natural mineral powder and natural antibacterial agent into a blender in proportion, and mix at a speed of 300-500 rpm for 30-60 minutes to ensure sufficient mixing; S4: dissolving the mixture in water or an organic solvent, stirring until uniformly dispersed, and maintaining the solution temperature between 25-35°C to avoid high temperature affecting the active ingredients; S5: The final pesticide solution is processed by a 3000-5000 psi high pressure homogenizer to enhance the stability and suspension performance of the solution, and then filled into a finished product.

7. The method for preparing the bacteriostatic and pollution-free green pesticide according to claim 6, characterized in that: The solvent is distilled water or ethanol, wherein ethanol with a purity of more than 99% is preferably used to ensure the stability of the pesticide.

8. The method for preparing the bacteriostatic and pollution-free green pesticide according to claim 6, characterized in that: The extraction temperature of the plant extracts A and B is controlled between 60° C. and 80° C., and the extraction is performed under a vacuum environment to reduce oxidation loss and retain active ingredients.

9. The method for preparing the bacteriostatic and pollution-free green pesticide according to claim 6, characterized in that: During the preparation of the pesticide, the pH value of the pesticide solution is adjusted to 5.5-7.5 by adding natural organic acid (such as citric acid) to enhance its antibacterial effect and plant compatibility.

10. The method for preparing the bacteriostatic and pollution-free green pesticide according to claim 6, characterized in that: In the step S4, a natural emulsifier (such as lecithin or xanthan gum) is added to improve the uniformity and stability of the pesticide solution, thereby ensuring that the pesticide is not easy to precipitate during the application process.

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