CN115191430B - Application of biomass-based surfactant system as auxiliary agent in improving effective utilization rate of pesticide - Google Patents

Abstract

The invention discloses application of a biomass-based surfactant system as an auxiliary agent in improving the effective utilization rate of pesticides. Aiming at the problems of unsatisfactory effect of the existing surfactant as an auxiliary agent in the aspects of inhibiting splashing and bouncing of liquid drops, environmental friendliness, low secondary pollution to the environment caused by mass use and the like, the efficient biomass-based surfactant system is provided. The biomass-based surfactant system consists of a sorbitol-based surfactant and at least one of glycerol, ethylene glycol and polyethylene glycol. The environment-friendly biomass-based surfactant system provided by the invention has the advantages of small dosage, good effect of inhibiting liquid medicine from splashing and bouncing, and functions of emulsification, dispersion and the like, can be used as a multifunctional green auxiliary agent in pesticides or herbicides, and accords with the development direction of green environmental protection.

Description

A biomass-based surfactant system as an auxiliary agent in improving the effective utilization of pesticides application in rate

technical field

The invention belongs to the technical field of application of pesticide adjuvants, and in particular relates to the application of a biomass-based surfactant system as an adjuvant in improving the effective utilization rate of pesticides.

Background technique

Spraying pesticides is a common method for controlling pests and weeds. The ultimate goal of spraying is to obtain sufficient coverage and uniform pesticide deposition on the leaves of target crops to achieve a good control effect. However, due to the influence of weather, spray solution, biological characteristics of target plants, and spray equipment, etc., the drift of pesticide droplets and the loss of droplets bouncing from the leaves of target plants not only lead to a low actual utilization rate of pesticides, but also affect the Contamination of soil, water sources and non-target organisms. Increasing the deposition of pesticide droplets by adding additives such as surfactants and polymers is an effective way to inhibit the bouncing behavior of pesticide droplets on the leaves of target plants. However, the addition of additives will reduce the particle size of spray droplets to a certain extent, resulting in drift and loss during spraying. In addition, commonly used surfactants are derived from petrochemicals, which have problems such as large dosage and poor biodegradability, which cause secondary pollution to plants and soil.

Biomass-based surfactants are non-toxic, biodegradable mild surfactants derived from abundant renewable resources, and have great potential for applications in many fields such as cleaning products, cosmetics, and food. Considering environmental and sustainable development issues, the advantages of easily biodegradable and biocompatible surfactants as pesticide adjuvants will become more and more significant. Therefore, it is of great significance to screen the types of biomass-based surfactants suitable for different plant applications to improve the effective utilization rate of biopesticides, reduce the dosage of pesticides, and save costs.

Contents of the invention

The purpose of the present invention is to use the biomass-based surfactant system derived from sorbitol to improve the wetting performance and retention of the pesticide solution on the target plant, thereby improving the effective utilization rate of the pesticide.

To achieve the above object, the technical solution adopted in the present invention is:

In one aspect, the invention provides a biomass-based surfactant system.

The biomass-based surfactant system provided by the present invention is composed of sorbitol-based surfactant and at least one of glycerin, ethylene glycol and polyethylene glycol;

Specifically, it can be composed of sorbitol-based surfactant and glycerin, composed of sorbitol-based surfactant and ethylene glycol, or composed of sorbitol-based surfactant and polyethylene glycol,

Preferably it consists of a sorbitol based surfactant and glycerin.

In the biomass-based surfactant system, the concentration of the sorbitol-based surfactant can be 0.25 to 2% (W/W), preferably 0.25 to 1% (w/w), more preferably 0.25% (w /w);

The concentration of at least one of glycerin, ethylene glycol and polyethylene glycol can be 0.001 to 2% (W/W), specifically, preferably 0.001 to 0.2% (w/w), more preferably 0.001 to 0.005% (w/w);

water balance.

The mass ratio of the sorbitol-based surfactant to at least one of glycerin, ethylene glycol and polyethylene glycol may be 250 to 1:1;

Specifically, the sorbitol-based surfactant may be SSAS-C ₁₂ .

The biomass-based surfactant system can be made into various formulations, specifically emulsifiable concentrates, microemulsions or oil formulations.

The above-mentioned biomass-based surfactant system is prepared by the following method:

The sorbitol-based surfactant is dissolved in water, and at least one of glycerin, ethylene glycol and polyethylene glycol is added, mixed evenly, and left standing to obtain the product.

In the above method, ultrasonic or heating-assisted dissolution can also be performed.

In the present invention, there is no special limitation on the order of adding the sorbitol-based surfactant and glycerin in the biomass-based surfactant system, and the order can be changed arbitrarily.

On the other hand, the present invention also provides the application of the above-mentioned biomass-based surfactant system as an auxiliary agent in improving the effective utilization rate of pesticides.

In the application, the pesticide may specifically be an insecticide and/or a herbicide;

In the application, the effective utilization rate refers to the maximum stable retention of the biomass-based surfactant system in improving the wetting performance of the insecticide or herbicide on the fruit and vegetable plants and the medicinal solution;

Wherein, the fruit and vegetable plant is a fruit and vegetable plant with superhydrophobic leaf surface; such as cabbage, green onion, quinoa weed, citrus and the like.

Specifically, the application is: the application of the biomass-based surfactant system as an auxiliary agent in inhibiting the splitting, splashing and bouncing behavior of pesticide droplets on the leaves of target plants.

In the application, the biomass-based surfactant system can be made into various preparations, specifically emulsifiable concentrates, microemulsions or oils;

The added amount of the biomass-based surfactant system as an auxiliary agent accounts for 1-10% of the mass of the pesticide.

The present invention also provides a pesticide system, which includes the biomass-based surfactant system, wherein the added amount of the biomass-based surfactant system accounts for 1-10% of the pesticide mass.

In the present invention, the above-mentioned biomass-based surfactant system is used as an auxiliary agent in insecticides or herbicides, and the wetting performance and retention of pesticide liquid on target plants can be significantly improved with a small dosage. In the present invention, the above-mentioned biomass-based surfactant system is used as an auxiliary agent for insecticides or herbicides to improve the effective utilization rate of medicinal liquid, and there is no report at home and abroad.

The present invention has following effect:

The invention uses an environmentally friendly sorbitol-based surfactant mixed with a small amount of glycerin as an auxiliary agent, which can significantly inhibit the splitting, splashing and bouncing of droplets, and increase the deposition amount of the medicinal solution on the leaf surface. The use concentration of the surfactant in the system of the present invention is low, and the surfactant also has an emulsifying effect. The invention provides an additive system with multiple functions such as wetting, spreading and emulsifying.

Description of drawings

Figure 1 shows the dynamic behavior of droplets impacting cabbage leaves. a) photo of cabbage; b) microstructure of cabbage leaf; c) contact angle of water on cabbage leaf, the contact angle is greater than 150°, indicating that cabbage leaf is a superhydrophobic solid surface; de) water and 0.001% glycerol droplets The dynamic deposition behavior on the leaf surface of cabbage showed fragmentation and bouncing; f) the dynamic deposition behavior of 0.25% SSAS-C ₁₂ droplets on the leaf surface of cabbage, although the bouncing of some droplets was inhibited, it still showed fragmentation g) After adding 0.25% SSAS-C ₁₂ +0.001% glycerol, it can completely inhibit the bouncing and fragmentation of droplets on the cabbage leaf surface, forming an effective deposition.

Figure 2 shows the dynamic behavior of droplets hitting other hydrophobic leaves. a) Photo of scallion leaf, microstructure and dynamic deposition behavior of 0.25% SSAS-C ₁₂ + 0.001% glycerol droplets on scallion leaf; b) Photo of weed Chenopodium leaf, microstructure and 0.25% SSAS-C ₁₂ The dynamic deposition behavior of +0.001% glycerol droplets on the leaves of Chenopodium; c) photos of citrus leaves, microstructure and dynamic deposition behavior of 0.25% SSAS-C ₁₂ +0.001% glycerol droplets on citrus leaves.

Figure 3 shows the dynamic surface tension of SSAS-C ₁₂ , glycerol and SSAS-C ₁₂ + glycerol systems, and the normalized contact diameter of different samples as a function of time.

Figure 4 shows the dynamic behavior of droplets hitting cabbage leaves. a) is water, b) is 0.25% SSAS- _C12 , c) is 0.25% SSAS-0.0005% glycerol, d) 0.25% SSAS-0.005% glycerol.

Detailed ways

The present invention will be further described in detail below in conjunction with specific embodiments, and the given examples are only for clarifying the present invention, not for limiting the scope of the present invention. The examples provided below can be used as a guideline for those skilled in the art to make further improvements, and are not intended to limit the present invention in any way.

The experimental methods in the following examples, unless otherwise specified, are conventional methods, carried out according to the techniques or conditions described in the literature in this field or according to the product instructions. The materials and reagents used in the following examples can be obtained from commercial sources unless otherwise specified.

Example

Weigh 250mg of SSAS-C ₁₂ and dissolve it in 100g of water, heat at 40°C for 20 minutes, dissolve, and cool down to room temperature. Add 0.001g of glycerin and stir evenly to obtain a mixed system of 0.25% SSAS-C ₁₂ +0.001% glycerin.

Choose the fresh cabbage plant with more than 5 leaves. Glue clean and fresh kale leaves onto glass slides. To preserve the blade structure, avoid contact with the blade surface during the experiment. Place the slides containing the cabbage leaves on the platform. Use the FASTCAM Mini UX100 Photron camera to capture the dynamic process of water droplets hitting cabbage leaves from the side. The camera frequency is adjusted to 8000fps, and the resolution is 1280×616. The droplet impact velocity was controlled by adjusting the release height of the droplet in the 1 ml injection needle. Here, the initial droplet release height was 30 cm from the leaves placed on the platform to ensure that the droplets hit the leaves at the same speed. The initial diameter of the droplet is approximately D ₀ =2±0.2 mm. 0.25% SSAS-C ₁₂ +0.001% glycerol mixed solution, 0.25% SSAS-C ₁₂ , 0.001% glycerol solution and ultrapure water were used as controls, and each experiment should be repeated at least 3 times.

Figure 1 shows the dynamic behavior of droplets impacting cabbage leaves. a) photo of cabbage; b) microstructure of cabbage leaf; c) contact angle of water on cabbage leaf, the contact angle is greater than 150°, indicating that cabbage leaf is a superhydrophobic solid surface; de) water and 0.001% glycerol droplets The dynamic deposition behavior on the leaf surface of cabbage showed fragmentation and bouncing; f) the dynamic deposition behavior of 0.25% SSAS-C ₁₂ droplets on the leaf surface of cabbage, although the bouncing of some droplets was inhibited, it still showed fragmentation g) After adding 0.25% SSAS-C ₁₂ +0.001% glycerol, it can completely inhibit the bouncing and fragmentation of droplets on the cabbage leaf surface, forming an effective deposition.

Pick scallions, quinoa and citrus live plants with 3 leaves. Glue clean and fresh leaves on glass slides. To preserve the blade structure, avoid contact with the blade surface during the experiment. Place the slide containing the leaves on the platform. Use the FASTCAM Mini UX100 Photron camera to shoot the dynamic process of water droplets hitting the blade from the side. The camera frequency is adjusted to 8000fps, and the resolution is 1280×616. The droplet impact velocity was controlled by adjusting the release height of the droplet in the 1 ml injection needle. Here, the initial droplet release height was 30 cm from the leaves placed on the platform to ensure that the droplets hit the leaves at the same speed. The initial diameter of the droplet is approximately D ₀ =2±0.2 mm. 0.25% SSAS-C ₁₂ +0.001% glycerin mixed solution and ultrapure water were used as controls, and each experiment should be repeated at least 3 times.

Figure 2 shows the dynamic behavior of droplets hitting other hydrophobic leaves. a) Photo of scallion leaf, microstructure and dynamic deposition behavior of 0.25% SSAS-C ₁₂ + 0.001% glycerol droplets on scallion leaf; b) Photo of weed Chenopodium leaf, microstructure and 0.25% SSAS-C ₁₂ The dynamic deposition behavior of +0.001% glycerol droplets on the leaves of Chenopodium; c) photos of citrus leaves, microstructure and dynamic deposition behavior of 0.25% SSAS-C ₁₂ +0.001% glycerol droplets on citrus leaves.

Select the fresh cabbage plant with more than 4 leaves. Glue clean and fresh kale leaves onto glass slides. To preserve the blade structure, avoid contact with the blade surface during the experiment. Place the slides containing the cabbage leaves on the platform. Use the FASTCAM Mini UX100 Photron camera to capture the dynamic process of water droplets hitting cabbage leaves from the side. The camera frequency is adjusted to 8000fps, and the resolution is 1280×616. The droplet impact velocity was controlled by adjusting the release height of the droplet in the 1 ml injection needle. Here, the initial droplet release height was 30 cm from the leaves placed on the platform to ensure that the droplets hit the leaves at the same speed. The initial diameter of the droplet is approximately D ₀ =2±0.2 mm. 0.25% SSAS-C ₁₂ +0.001% glycerol mixed solution, 0.25% SSAS-C ₁₂ , 0.001% glycerol solution and ultrapure water were used as controls, and each experiment should be repeated at least 3 times.

Figure 3 shows the dynamic surface tension of SSAS-C ₁₂ , glycerol and SSAS-C ₁₂ + glycerol systems, and the normalized contact diameter of different samples as a function of time.

Choose the fresh cabbage plant with more than 3 leaves. Glue clean and fresh kale leaves onto glass slides. To preserve the blade structure, avoid contact with the blade surface during the experiment. Place the slides containing the cabbage leaves on the platform. Use the FASTCAM Mini UX100 Photron camera to capture the dynamic process of water droplets hitting cabbage leaves from the side. The camera frequency is adjusted to 8000fps, and the resolution is 1280×616. The droplet impact velocity was controlled by adjusting the release height of the droplet in the 1 ml injection needle. Here, the initial droplet release height was 30 cm from the leaves placed on the platform to ensure that the droplets hit the leaves at the same speed. The initial diameter of the droplet is approximately D ₀ =2±0.2 mm. 0.25% SSAS-C ₁₂ +0.0005% glycerol mixed solution, 0.25% SSAS-C ₁₂ and ultrapure water were used as controls, and each experiment should be repeated at least 3 times.

Figure 4 shows the dynamic behavior of droplets hitting cabbage leaves. a) is water, b) is 0.25% SSAS- _C12 , c) is 0.25% SSAS- _C12 + 0.0005% glycerol, d) is 0.25% SSAS- _C12 + 0.005% glycerol.

It can be seen from Figure 4 that the concentration of glycerol in the SSAS-C ₁₂ glycerol mixed solution can significantly affect the wetting and spreading performance of droplets on the leaf surface. The increase of the concentration of glycerol in the mixed solution can significantly inhibit the bouncing behavior of the droplets on the leaf surface, and have a good wetting and spreading effect.

The present invention has been described in detail above. For those skilled in the art, without departing from the spirit and scope of the present invention, and without unnecessary experiments, the present invention can be practiced in a wider range under equivalent parameters, concentrations and conditions. While specific embodiments of the invention have been shown, it should be understood that the invention can be further modified. In a word, according to the principles of the present invention, this application intends to include any changes, uses or improvements to the present invention, including changes made by using conventional techniques known in the art and departing from the disclosed scope of this application.

Claims (7)

1. A biomass-based surfactant system consisting of a sorbitol-based surfactant, glycerol, and water; in the biomass-based surfactant system, the sorbitol-based surfactant is SSAS-C ₁₂ ，

The composition of the biomass-based surfactant system is: 0.25 w/w% SSAS-C ₁₂ +0.001 w/w% glycerol+water balance or 0.25 w/w% SSAS-C ₁₂ +0.005 w/w% glycerol+water balance.

2. A method of preparing the biomass-based surfactant system of claim 1, comprising: dissolving sorbitol-based surfactant in water, adding glycerol, mixing, and standing.

3. Use of the biomass-based surfactant system of claim 1 as an adjuvant for increasing the effective utilization of pesticides.

4. A use according to claim 3, characterized in that: in the application, the effective utilization rate refers to the maximum stable retention of the biomass-based surfactant system in improving the wetting performance of pesticides or herbicides on fruit and vegetable plants and the liquid medicine.

5. A use according to claim 3, characterized in that: the application is as follows: the application of the biomass-based surfactant system as an auxiliary agent in inhibiting the splitting, splashing and bouncing behaviors of pesticide droplets on the leaf surfaces of target plants.

6. A pesticide system comprising the biomass-based surfactant system of claim 1.

7. A pesticide system as set forth in claim 6 wherein: the addition amount of the biomass-based surfactant system accounts for 1-10% of the mass of the pesticide.

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