Surfactant composition for pouring and preparation method and application thereof

Abstract

The invention relates to a surfactant composition for irrigation as well as a preparation method and application thereof, and belongs to the technical field of agricultural inputs. The composition consists of the following components: a wetting agent, a penetrating agent, an emulsifying agent, a compatible agent, a water-retaining agent, a soil loosening agent, a soil conditioner, a solvent and water, the weight ratio of the wetting agent to the penetrating agent to the emulsifying agent is 1: (1-4): (0.5-2); the wetting agent is prepared from isodecanol polyoxyethylene ether, organic silicon modified polyoxyethylene ether and fluorocarbon modified polyoxyethylene ether according to the mass ratio of 2: 1: 1; the penetrating agent is diisooctyl maleate sulfonate; the emulsifier is prepared from ammonium dodecylbenzene sulfonate and EO / PO block polyether in a mass ratio of 2: 3. The surfactant composition for irrigation is good in wettability and high in permeability, enables soil to keep moist for a longer time, can improve the problem of soil hardening and improve the soil porosity, and is beneficial to better growth of soil microorganisms and crops.

Description

Technical Field

[0001] The invention relates to the technical field of agricultural input processing, and specifically provides a surfactant composition for irrigation, a preparation method and application thereof. Background Art

[0002] There are some technical problems in farmland irrigation that need to be solved urgently, such as large amount of water in flooding, which may cause slow water infiltration, soil compaction, nutrient loss in the soil, etc.; small amount of water in sprinkler or drip irrigation may cause uneven water distribution and difficulty in fully wetting the soil (insufficient wetting range and depth); when water, fertilizer and medicine are used in an integrated manner, uneven dispersion of fertilizer and medicine may cause fertilizer and medicine damage, etc. Most of these problems can be solved by adding specific surfactant compositions during irrigation.

[0003] Surfactants can be divided into thousands of categories according to their structure, type, function, etc., such as small molecules, polymers; anions, cations, non-ions; polyethers, sulfonates, phosphates; wetting, dispersing, emulsifying, etc. Surfactants of different types and functions can often work together synergistically, thus showing a wider range of applications and better application performance. Summary of the invention

[0004] In view of the above-mentioned problems existing in the prior art, the present invention provides a surfactant composition for irrigation, a preparation method thereof and an application thereof. The present invention is rationally designed according to different requirements for water wetting, penetration, dispersion and retention during the irrigation process, and surfactants of different types and functions are scientifically matched, thereby achieving better effects of wetting the soil, evenly distributing water (including medicine and fertilizer), keeping the soil moist for a long time, and improving soil compaction.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] In one aspect, the present invention provides a surfactant composition, comprising the following components in parts by weight:

[0007] 3-15 parts by weight of wetting agent;

[0008] 5-25 parts by weight of penetrant;

[0009] Emulsifier 5-10 parts by weight;

[0010] 1-5 parts by weight of compatibility agent;

[0011] 0.1-5 parts by weight of water retaining agent;

[0012] 0.1-5 parts by weight of soil loosening agent;

[0013] 5-10 parts by weight of soil conditioner;

[0014] 0.1-3 parts by weight of solvent;

[0015] 20-80 parts by weight of water;

[0016] The weight ratio of the wetting agent, penetrant and emulsifier is 1:1-4:0.5-2;

[0017] The wetting agent is isomeric decanol polyoxyethylene ether, silicone-modified polyoxyethylene ether and fluorocarbon-modified polyoxyethylene ether in a mass ratio of 2:1:1;

[0018] The penetrant is diisooctyl maleate sulfonate;

[0019] The emulsifier is ammonium dodecylbenzenesulfonate and EO / PO block polyether in a mass ratio of 2:3.

[0020] Preferably, the weight ratio of the wetting agent, the penetrant and the emulsifier is 1:2.5:1.25.

[0021] Furthermore, the compatibility agent is a polycarboxylate dispersant, such as sodium styrene sulfonate maleic anhydride copolymer, acrylic acid-maleic anhydride copolymer sodium salt, etc. The water retaining agent is glycerol, polyethylene glycol, polypropylene glycol, sodium alginate, carboxymethyl cellulose, and guar gum. The soil loosening agent is wood vinegar, sodium lauryl sulfate, tea saponin, fatty alcohol polyoxyethylene ether sodium sulfate, and cocamidopropyl betaine. The soil conditioner is humic acid, fulvic acid, rhamnolipid, soluble seaweed powder, polyglutamic acid, and fish protein peptide. The solvent is ethanol, butanol, isopentanol, propylene glycol monomethyl ether, N,N-dimethylformamide, and sec-butyl acetate.

[0022] On the other hand, the present invention also provides a method for preparing the above-mentioned surfactant composition, which comprises first dissolving the solid components (soil improver, etc.) in the composition in water under stirring or shearing conditions to form a uniform solution, and then adding the liquid components to form a uniform solution through stirring or shearing.

[0023] In another aspect, the present invention further provides an application of the above surfactant composition, wherein the surfactant composition is diluted 1000 to 5000 times and applied to the soil during irrigation or drip irrigation.

[0024] It can be used for different irrigation methods such as drip irrigation, sprinkler irrigation, and flood irrigation.

[0025] The functional design of the surfactant composition for irrigation of the present invention is based on the following considerations:

[0026] Surface tension can be understood as the force that causes the molecules on the surface of the liquid to accumulate inward. It can shrink the surface of the liquid. Generally, the greater the surface tension, the less likely the liquid is to spread. Only when the surface tension is reduced to a certain extent can the liquid spread or penetrate on a specific surface. For example, the surface tension of water is greater than the critical surface tension of the lotus leaf, so it cannot wet the lotus leaf and can easily slide off the lotus leaf. When a wetting agent is added to make the surface tension of water lower than the critical surface tension of the lotus leaf, water can wet the lotus leaf. Wetting agents are a type of substance that can significantly reduce the surface tension of aqueous solutions. They can reduce the surface tension of water to a very low level at a low concentration. Generally speaking, silicone-modified polyethers and fluorocarbon-modified polyether surfactants have the most obvious effect in reducing surface tension, which can reduce the surface tension of water from about 70mN / m to below 20mN / m. The second is various polyoxyethylene polyoxypropylene ether surfactants, which also have a good effect of reducing surface tension and can usually be used as wetting agents. During irrigation, if you want to improve the water utilization rate, you must first make it easier for water to wet the soil. Wetting the soil is a prerequisite for water to penetrate and disperse in the soil. Soil is a complex mixture containing organic and inorganic substances. Different substances are unevenly distributed and the internal structure is loose and dense, which makes it difficult for water to evenly and efficiently wet and penetrate the soil. This problem can be solved by adding a suitable wetting agent. In the present invention, isomeric decanol polyoxyethylene ether, silicone-modified polyoxyethylene ether and fluorocarbon-modified polyoxyethylene ether with good wetting effect are used as components that play a wetting function in the surfactant composition, which can improve irrigation efficiency and the uniformity of water distribution in the soil.

[0027] Another problem in the irrigation process is that the amount of water and the speed of water penetration are significantly reduced after the water penetrates more than ten centimeters below the surface soil, which makes the water volatilize easily and reduces the water utilization rate. Adding a penetrant can promote the penetration of water into the deep soil, and can increase the speed and depth of water infiltration. Deep water penetration is conducive to more uniform water distribution, and is also conducive to reducing evaporation losses, which can indirectly play a role in water conservation. The present invention selects diisooctyl maleate sulfonate as a penetrant to increase the penetration of water into the deep soil, which has a good effect.

[0028] Emulsifiers are usually amphiphilic structures with hydrophilic and lipophilic ends, which can make the water-insoluble organic phase evenly dispersed in water in the form of tiny oil droplets, so that the organic phase and the aqueous phase form a uniform emulsion or microemulsion. The addition of emulsifiers has the following effects. First, in the process of integrated application of water, pesticides and fertilizers, some elements in pesticides or fertilizers are easily adsorbed by soil organic matter or blocked by soil particles, resulting in uneven distribution or inability to penetrate to a sufficient depth, which is not conducive to their full play. The addition of emulsifiers can wrap pesticide particles and wash them out of the soil, increase their mobility in the soil, and make them more evenly distributed and penetrate deeper, which has a significant effect on the prevention and control of certain soil-borne diseases such as nematodes. Second, emulsifiers can promote the redistribution of soil organic matter and make the distribution of organic matter in the soil more even. Third, the amphiphilicity of the emulsifier gives it a certain water retention effect, which can slow down the evaporation of soil water.

[0029] Compatibility agents can improve the problem of poor compatibility when multiple fertilizers and drugs are mixed during the integrated application of water, fertilizers, and drugs, which is mainly manifested in the unstable phenomena such as precipitation, flocculation, and demulsification that are easy to occur during the mixing of different drugs or fertilizers. The present invention selects high molecular weight polycarboxylate surfactants as compatibility agents. High molecular weight polycarboxylate surfactants are a type of high-efficiency dispersant, which generally has a "comb-like" structure. The functional groups grafted on the molecular chain are arranged like the teeth of a comb. The functional groups can be anchored to the surface of the dispersed object through van der Waals forces, hydrogen bonds, etc., so as to wrap up the dispersed object, and the dispersed objects are separated from each other by steric hindrance. At the same time, the polycarboxylate dispersant itself carries a negative charge, and after adsorption on the dispersed object, the dispersed object particles can be made to carry the same charge, and the dispersed object particles can be kept stably dispersed by electrostatic repulsion. The addition of a compatibility agent can increase the stability of the diluent during the integrated use of water, fertilizer, and drugs.

[0030] Water retaining agent has the effect of delaying water evaporation, can firmly lock the water in the soil, and keep the soil moist for a longer time. Soil is the main object of irrigation, and soil compaction, salinization, nutrient deficiency, etc. are also problems that need to be solved during irrigation. In the surfactant mixture for irrigation of the present invention, a foaming agent with strong foaming property is used to solve the problem of soil compaction. The foaming agent has a strong foaming property, and can produce micro-bubbles after being irrigated into the soil with water, thereby improving the looseness of the soil. The soil conditioner mainly increases soil nutrition and provides better living conditions for soil microorganisms and crops. Only when the soil is healthy, irrigation is more meaningful. The present invention adds substances with plant growth regulation and soil conditioning effects (chelating heavy metals, improving soil microenvironment) such as humic acid, wood vinegar, rhamnolipids, seaweed extracts, etc. as a functional component to the surfactant composition for irrigation, which can better highlight the effect of the surfactant composition for irrigation of the present invention.

[0031] In the present invention, a small amount of solvent needs to be added depending on the types of components of the composition. Its main function is to enhance the stability of the surfactant composition of the present invention and make the various types of components therein more compatible.

[0032] Compared with the prior art, the present invention has the following beneficial effects.

[0033] The present invention compounds a wetting agent, a penetrant and an emulsifier, and adjusts the dosage and proportion of the three, so that the prepared composition can better moisten the soil, evenly distribute water (including medicine and fertilizer), keep the soil moist for a long time, and improve soil compaction and other problems.

[0034] The surfactant composition for irrigation of the present invention has the following advantages: first, it can promote the rapid wetting of soil and infiltration of water during irrigation, thereby improving irrigation efficiency; second, it can promote the uniform distribution of water, fertilizer or medicine in the soil, thereby improving the utilization rate of water, fertilizer or medicine; third, it can increase the depth of water infiltration, thereby keeping the soil moist for a longer period of time. Fourth, it can improve the problem of soil compaction and increase soil looseness. Fifth, it can improve the soil microenvironment, thereby facilitating the better growth of soil microorganisms and crops. DETAILED DESCRIPTION

[0035] In order to make the technical problems to be solved, technical solutions and advantages of the present invention more clear, they are described in detail below in conjunction with specific embodiments.

[0036] The reagents and materials used in the embodiments and comparative examples, unless otherwise specified, can be obtained through commercial channels. Among them, isomeric decanol polyoxyethylene ether is XP-30 from Jiangsu Hai'an Petrochemical Plant, silicone-modified polyoxyethylene ether is GY-S903 from Beijing Guangyuan Yinong Chemical Co., Ltd., fluorocarbon-modified polyoxyethylene ether is YM313 from Shanghai Yumu Chemical Co., Ltd., fatty alcohol alkoxylate is GENAPOL ED 3060 from Guangzhou Shengbang Chemical Technology Co., Ltd., diisooctyl maleate sulfonate is fast penetrant T from Jiangsu Hai'an Petrochemical Plant, ammonium dodecylbenzenesulfonate is from Jiangsu Xinde Biotechnology Co., Ltd., and EO / PO block polyether is L64 from Jiangsu Hai'an Petrochemical Plant.

[0037] The present invention provides a surfactant composition for irrigation, a preparation method and an application thereof, and specific embodiments are as follows.

[0038] Example 1

[0039] A surfactant composition for irrigation, the dosage of each component is shown in Table 1; wherein the compatibility agent is sodium styrene sulfonate maleic anhydride copolymer; the water retaining agent is glycerol; the soil loosening agent is wood vinegar; the soil improver is humic acid; and the solvent is ethanol;

[0040] The above-mentioned surfactant composition for irrigation is prepared by the following method:

[0041] The soil improver and the compatibility agent are stirred and sheared to completely dissolve in water, and then a wetting agent, a penetrant, an emulsifier, a water retaining agent, a soil loosening agent and a solvent are added and sheared and stirred to form a surfactant composition for irrigation.

[0042] Table 1

[0043]

[0044] Example 2

[0045] A surfactant composition for irrigation, the dosage of each component is shown in Table 1; wherein the compatibility agent is sodium salt of acrylic acid-maleic anhydride copolymer; the water retaining agent is sodium alginate; the soil loosening agent is sodium dodecyl sulfate; the soil improver is rhamnolipid; and the solvent is butanol;

[0046] The preparation method of the above-mentioned surfactant composition for irrigation is the same as that of Example 1: first, the solid components in the composition are stirred and sheared to make them completely dissolved in water, and then the liquid components are added and sheared and stirred to form a uniform solution.

[0047] Example 3

[0048] A surfactant composition for irrigation, the dosage of each component is shown in Table 1; wherein the compatibility agent is sodium styrene sulfonate maleic anhydride copolymer; the water retaining agent is polypropylene glycol; the soil loosening agent is cocamidopropyl betaine; the soil improver is soluble seaweed powder; the solvent is isoamyl alcohol;

[0049] The preparation method of the above-mentioned surfactant composition for irrigation is the same as that of Example 2.

[0050] Example 4

[0051] A surfactant composition for irrigation, the dosage of each component is shown in Table 1; wherein the compatibility agent is sodium salt of acrylic acid-maleic anhydride copolymer; the water retaining agent is carboxymethyl cellulose; the soil loosening agent is tea saponin; the soil improver is polyglutamic acid; and the solvent is propylene glycol monomethyl ether;

[0052] The preparation method of the above-mentioned surfactant composition for irrigation is the same as that of Example 2.

[0053] Example 5

[0054] A surfactant composition for irrigation, the dosage of each component is shown in Table 1; wherein the compatibility agent is sodium styrene sulfonate maleic anhydride copolymer; the water retaining agent is guar gum; the soil loosening agent is sodium fatty alcohol polyoxyethylene ether sulfate; the soil improver is fish protein peptide; the solvent is N,N-dimethylformamide;

[0055] The preparation method of the above-mentioned surfactant composition for irrigation is the same as that of Example 2.

[0056] Example 6

[0057] A surfactant composition for irrigation, the dosage of each component is shown in Table 1; wherein the compatibility agent is sodium styrene sulfonate maleic anhydride copolymer; the water retaining agent is glycerol; the soil loosening agent is wood vinegar; the soil improver is humic acid; and the solvent is ethanol;

[0058] The preparation method of the above-mentioned surfactant composition for irrigation is the same as that of Example 1.

[0059] Example 7

[0060] A surfactant composition for irrigation, the dosage of each component is shown in Table 1; wherein the compatibility agent is sodium styrene sulfonate maleic anhydride copolymer; the water retaining agent is glycerol; the soil loosening agent is wood vinegar; the soil improver is humic acid; and the solvent is ethanol;

[0061] The preparation method of the above-mentioned surfactant composition for irrigation is the same as that of Example 1.

[0062] In order to further illustrate the beneficial effects of the present invention, due to limited space, only Example 6 is taken as an example to construct a comparative example as follows.

[0063] Comparative Example 1

[0064] In this comparative example, the isomeric decanol polyoxyethylene ether is replaced by an equal amount of silicone-modified polyoxyethylene ether, and the other conditions are the same as those in Example 6.

[0065] Comparative Example 2

[0066] In this comparative example, the isomeric decanol polyoxyethylene ether is replaced by an equal amount of fluorocarbon modified polyoxyethylene ether, and the other conditions are the same as those in Example 6.

[0067] Comparative Example 3

[0068] In this comparative example, the organosilicon-modified polyoxyethylene ether is replaced by an equal amount of fluorocarbon-modified polyoxyethylene ether, and the other conditions are the same as those in Example 6.

[0069] Comparative Example 4

[0070] In this comparative example, the organosilicon-modified polyoxyethylene ether is replaced by an equal amount of isomeric decanol polyoxyethylene ether, and the other conditions are the same as those in Example 6.

[0071] Comparative Example 5

[0072] In this comparative example, the fluorocarbon modified polyoxyethylene ether is replaced by an equal amount of isomeric decanol polyoxyethylene ether, and the other conditions are the same as those in Example 6.

[0073] Comparative Example 6

[0074] In this comparative example, the fluorocarbon-modified polyoxyethylene ether is replaced by an equal amount of silicone-modified polyoxyethylene ether, and the other conditions are the same as those in Example 6.

[0075] Comparative Example 7

[0076] In this comparative example, the fluorocarbon modified polyoxyethylene ether was replaced by an equal amount of castor oil polyoxyethylene ether, and the other conditions were the same as those in Example 6.

[0077] Comparative Example 8

[0078] In this comparative example, the organosilicon-modified polyoxyethylene ether is replaced by an equal amount of castor oil polyoxyethylene ether, and the other conditions are the same as those in Example 6.

[0079] Comparative Example 9

[0080] In this comparative example, isomeric decanol polyoxyethylene ether is replaced by an equal amount of castor oil polyoxyethylene ether, and the other conditions are the same as those in Example 6.

[0081] Comparative Example 10

[0082] In this comparative example, the fluorocarbon-modified polyoxyethylene ether is replaced by an equal amount of tristyrylphenol polyoxyethylene ether, and the other conditions are the same as those in Example 6.

[0083] Comparative Example 11

[0084] In this comparative example, the organosilicon-modified polyoxyethylene ether is replaced by an equal amount of tristyrylphenol polyoxyethylene ether, and the other conditions are the same as those in Example 6.

[0085] Comparative Example 12

[0086] In this comparative example, the isomeric decanol polyoxyethylene ether is replaced by an equal amount of tristyrylphenol polyoxyethylene ether, and the other conditions are the same as those in Example 6.

[0087] Comparative Example 13

[0088] In this comparative example, the mass ratio of isomeric decanol polyoxyethylene ether, silicone-modified polyoxyethylene ether and fluorocarbon-modified polyoxyethylene ether is 1:1:1, and the other conditions are the same as those in Example 6.

[0089] Comparative Example 14

[0090] In this comparative example, the mass ratio of isomeric decanol polyoxyethylene ether, silicone-modified polyoxyethylene ether and fluorocarbon-modified polyoxyethylene ether is 1:2:1, and the other conditions are the same as those in Example 6.

[0091] Comparative Example 15

[0092] In this comparative example, the mass ratio of isomeric decanol polyoxyethylene ether, silicone-modified polyoxyethylene ether and fluorocarbon-modified polyoxyethylene ether is 1:1:2, and the other conditions are the same as those in Example 6.

[0093] Comparative Example 16

[0094] In this comparative example, di(2-ethylhexyl)maleate sulfonate was replaced by an equal amount of sodium isooctyl alcohol polyoxyethylene ether phosphate, and the other conditions were the same as those in Example 6.

[0095] Comparative Example 17

[0096] In this comparative example, ammonium dodecylbenzenesulfonate was replaced with an equal amount of EO / PO block polyether, and the other conditions were the same as those in Example 6.

[0097] Comparative Example 18

[0098] In this comparative example, the EO / PO block polyether was replaced with an equal amount of ammonium dodecylbenzenesulfonate, and the other conditions were the same as those in Example 6.

[0099] Comparative Example 19

[0100] In this comparative example, the EO / PO block polyether is replaced by an equal amount of fatty alcohol alkoxylate, and the other conditions are the same as those in Example 6.

[0101] Comparative Example 20

[0102] In this comparative example, ammonium dodecylbenzenesulfonate was replaced by an equal amount of fatty alcohol alkoxylate, and the other conditions were the same as those in Example 6.

[0103] Comparative Example 21

[0104] In this comparative example, the mass ratio of ammonium dodecylbenzenesulfonate to EO / PO block polyether is 3:2, and the other conditions are the same as those in Example 6.

[0105] Comparative Example 22

[0106] In this comparative example, the mass ratio of ammonium dodecylbenzenesulfonate to EO / PO block polyether is 1:2, and the other conditions are the same as those in Example 6.

[0107] The compositions prepared in the above-mentioned embodiments and comparative examples were subjected to performance tests, and the results are shown in Tables 2-3, specifically testing the wetting performance and penetration effect on the soil at different dilution multiples, the effect on the diffusion performance of the drug avermectin in the soil, and the effect on the root length and fresh weight of cucumber seedlings.

[0108] 1. Soil wetting performance test method: Mix talcum powder and ordinary soil powder in a ratio of 1:10, and press the mixture into a compact plane with a glass plate. Dilute the prepared surfactant composition sample 1000 times (the samples tested below are also diluted according to this dilution method). Using clean water as a blank control, use a rubber-tipped dropper to drop a drop of the sample dilution and talcum powder soil mixture on the plane, and record the time it takes for the drop to completely penetrate the soil and talcum powder mixture plane. The shorter the time, the better the wetting effect.

[0109] 2. Soil penetration test method: A certain amount of kaolin was loaded into a disposable plastic dropper and compacted to ensure that the amount of kaolin loaded in each tube and the filling height were consistent. 0.1% carmine dye was added to the dilutions of different surfactant composition samples to dye the dilutions red for easy observation. 3 ml of the surfactant composition dilution was added to the plastic drip irrigation containing kaolin, and the time for the dilution to completely penetrate the kaolin was recorded.

[0110] 3. Test method for improving the diffusion performance of drugs or fertilizers: Use the soil adjuvant composition in combination with the drug avermectin for controlling underground pests to test the diffusion distance of the drug solution in the soil. Make a 1 cm diameter round hole on one side of the wall of a transparent plastic tube with a diameter of 5 cm, with a hole spacing of 5 cm. The length of the plastic tube is 50 cm. Block the bottom of the plastic tube with a screen and place the plastic tube vertically, fill the plastic tube with sand, dilute the commercially available 10% avermectin suspension 100 times to prepare a drug solution, take 200 ml of the diluted drug solution, and slowly drip it into the sand from the top of the plastic tube. After the drug solution completely penetrates the sand in the tube, take a soil sample from the hole on the side of the tube wall to test whether there is avermectin drug component and determine the infiltration depth of the drug.

[0111] The composition of the embodiment or comparative example and the agent were mixed evenly at a mass ratio of 1:5 and then diluted to ensure that the dilution multiple of the agent was 100 times. Similarly, 200 ml of the diluted drug solution containing the adjuvant was dripped into the sand column. After the drug solution penetrated to the bottom, a sample was taken to detect the infiltration depth of the agent. The greater the infiltration depth, the better the synergistic diffusion effect on the agent.

[0112] 4. Effect on crop growth: Cucumbers were planted using vermiculite as the substrate, and clean water was used as the control. The cucumber seedlings were watered with the diluted solutions of the compositions of different embodiments and comparative examples, with a watering amount of 50 ml each time, once every 7 days, for a total of 3 times, and the growth of the cucumber seedlings was observed. The fresh weight of the aboveground part of the cucumber seedlings was measured 1 week after the last watering.

[0113] The performance test results of different soil adjuvant compositions are shown in Table 2-3.

[0114] Table 2

[0115]

[0116] As can be seen from Table 2, the present invention defines the wetting agent, penetrant and emulsifier, and defines the components and proportions of the wetting agent and the emulsifier. The prepared composition has good wetting properties, can diffuse to a greater depth in a shorter time, has good penetration properties, and has a better weight gain for the fresh weight of cucumber seedlings.

[0117] Table 3

[0118]

[0119] As can be seen from Table 3, in Comparative Examples 1-6, one component of the wetting agent was omitted, and only two wetting agents were compounded. The wettability and permeability of the obtained composition were greatly reduced, and the penetration depth was only 30 cm. It had a certain weight-increasing effect on the fresh weight of cucumber seedlings, but the effect was not obvious.

[0120] In Comparative Examples 7-12, one component of the wetting agent was replaced with a wetting agent commonly used in the art, and in Comparative Examples 13-15, the ratio between the three wetting agents in the present invention was adjusted. In Comparative Example 16, the penetrant of the present invention was replaced with sodium isooctyl polyoxyethylene ether phosphate, and in Comparative Examples 17-22, the emulsifier formula and dosage were adjusted. The performance of the obtained compositions in various aspects was significantly reduced.

[0121] In summary, the surfactant composition prepared by the present invention has good wetting and penetration properties on the soil, can promote the diffusion of drugs into the deeper soil, and is conducive to forming a larger protection range. It can promote the growth of the aboveground part of cucumber plants, which has obvious advantages over the composition not prepared by the present invention.

[0122] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A surfactant composition for irrigation, characterized in that It is composed of the following components in parts by weight: 3-15 parts by weight of wetting agent; 5-25 parts by weight of penetrant; Emulsifier 5-10 parts by weight; 1-5 parts by weight of compatibility agent; Water retaining agent 0.1~5 parts by weight; 0.1-5 parts by weight of soil loosening agent; 5-10 parts by weight of soil conditioner; 0.1-3 parts by weight of solvent; 20-80 parts by weight of water; The weight ratio of the wetting agent, penetrant and emulsifier is 1:1-4:0.5-2; The wetting agent is isomeric decanol polyoxyethylene ether, silicone-modified polyoxyethylene ether and fluorocarbon-modified polyoxyethylene ether in a mass ratio of 2:1:1; The penetrant is diisooctyl maleate sulfonate; The emulsifier is ammonium dodecylbenzenesulfonate and EO / PO block polyether in a mass ratio of 2:

3.

2. The surfactant composition for irrigation according to claim 1, characterized in that The weight ratio of the wetting agent, the penetrant and the emulsifier is 1:2.5:1.

25.

3. The surfactant composition for irrigation according to claim 2, characterized in that: The compatibility agent is sodium styrene sulfonate maleic anhydride copolymer or acrylic acid-maleic anhydride copolymer sodium salt.

4. The surfactant composition for irrigation according to claim 3, characterized in that The water retaining agent is one or more of glycerol, polyethylene glycol, polypropylene glycol, sodium alginate, carboxymethyl cellulose and guar gum.

5. The surfactant composition for irrigation according to claim 4, characterized in that The soil loosening agent is one or more of wood vinegar, sodium lauryl sulfate, tea saponin, sodium fatty alcohol polyoxyethylene ether sulfate, and cocamidopropyl betaine.

6. The surfactant composition for irrigation according to claim 5, characterized in that The soil conditioner is one or more of humic acid, fulvic acid, rhamnolipid, soluble seaweed powder, polyglutamic acid, and fish protein peptide.

7. The surfactant composition for irrigation according to claim 6, characterized in that The solvent is one or more of ethanol, butanol, isopentanol, propylene glycol monomethyl ether, N,N-dimethylformamide and sec-butyl acetate.

8. The method for preparing the surfactant composition for irrigation according to any one of claims 1 to 7, characterized in that: First, the solid components in the composition are dissolved in water under stirring or shearing conditions to form a uniform solution, and then the liquid components are added and stirred or sheared to form a uniform solution.

9. The method for applying the surfactant composition for irrigation according to any one of claims 1 to 7, characterized in that: The surfactant composition is diluted 1000 to 5000 times and applied to the soil by watering or drip irrigation.

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