Agricultural mineral oil emulsifier as well as preparation method and application thereof

Abstract

The invention discloses an agricultural mineral oil emulsifier, and belongs to the technical field of pesticide adjuvants, and the agricultural mineral oil emulsifier comprises the following components by mass: 60-90% of castor oil polyoxyethylene ether, 6-30% of dodecylphenol polyoxyethylene ether, 1-10% of fatty alcohol-polyoxyethylene ether, and 1-10% of block polyether. The mineral oil emulsifier has a good emulsifying effect on mineral oil, and can well solve the problems of uneven dispersion and emulsification, demulsification and the like easily occurring when the conventional emulsifier is used for emulsifying the mineral oil. The mineral oil emulsifier is simple to prepare, environment-friendly and efficient, and the mineral oil emulsion prepared from the mineral oil emulsifier is uniform and stable in appearance and colorless or faint yellow. When the oil agent is mixed with water for use, the oil agent is uniformly dispersed in water, no floating oil appears on the surface of the emulsion, an oil layer is gradually separated out after standing for 20-40 minutes, and the problems that when an existing mineral oil emulsion is applied, phytotoxicity easily occurs, crop surfaces are damaged and the like can be well solved.

Description

Technical Field

[0001] The present invention relates to an agricultural mineral oil emulsifier, a preparation method thereof, and an application thereof, belonging to the technical field of pesticide auxiliaries. Background Art

[0002] Mineral oil emulsion is a physical insecticide, commonly used for controlling crop pests and diseases. Its mechanism of action is that the mineral oil is emulsified by an emulsifier, diluted with water and then sprayed. The medicament forms an oil film on the surface of the insect body, eggshell, hypha or weed. The oil film can both suffocate pests and penetrate into the insect body, thereby causing its death; Mineral oil can also prevent or reduce diseases through the principle of physical isolation, that is, after spraying mineral oil on the surface of the plant body, an oil film is formed on the leaf surface, creating a physical barrier between the plant tissue and the disease, blocking the spread of pathogen spores, and interfering with their infection and vegetative growth, thereby achieving the effect of physical control; At the same time, the mycelium and spores of certain diseases can be directly killed by sealing with the oil film, such as powdery mildew, Aschersonia aleyrodis, etc. In nature, mineral oil emulsion can be oxidized and degraded, with a short residual period, no pollution to the environment, and safe for humans, animals and natural enemies. Therefore, it is an ideal pesticide for sustainable pest control.

[0003] The reason for the formation of the oil film by the mineral oil emulsion lies in the demulsification of the emulsion. Therefore, the emulsifying performance of the mineral oil emulsifier used is the key to controlling the insecticidal effect and phytotoxicity, and also the key to affecting the product quality of the mineral oil emulsion. At present, the commonly used emulsifiers for mineral oil emulsion are Span-Tween series auxiliaries. When using such auxiliaries to emulsify mineral oil, the problem of uneven emulsification often occurs, and the demulsification time of the prepared mineral oil emulsion is very fast (usually within 10 minutes), making it impossible for the mineral oil to be fully mixed with other components. When spraying, it forms an uneven distribution on the surface of the leaves or young fruits, and too high a local concentration will directly burn the tissue, resulting in brown spots on the fruit surface or leaf scorch.

[0004] Therefore, in order to better solve the problem of too fast demulsification time of the existing mineral oil preparation, it is urgent to develop an emulsifier for mineral oil emulsifiable concentrate that is easy to produce, more environmentally friendly and more efficient. Summary of the Invention

[0005] The purpose of the present invention is to solve the deficiencies of the existing technology and provide an agricultural mineral oil emulsifier and a preparation method thereof, which have good emulsifying effects on agricultural mineral oil, the obtained mineral oil emulsion has good stability, and has a suitable demulsification time.

[0006] In order to achieve the above purpose, the present invention adopts the following technical effects:

[0007] An agricultural mineral oil emulsifier, based on 100% of its total mass, is composed of components with the following mass percentage contents: 60 - 90% of castor oil polyoxyethylene ether, 6 - 30% of dodecylphenol polyoxyethylene ether, 1 - 10% of fatty alcohol polyoxyethylene ether, and 1 - 10% of block polyether.

[0008] Furthermore, the castor oil polyoxyethylene ether is selected from one or a combination of any proportions of EL-10, EL-20, EL-36, BY-110, BY-112, or BY-125.

[0009] Furthermore, the dodecylphenol polyoxyethylene ether is selected from one or a combination of any proportions of dodecylphenol polyoxyethylene (4) ether, dodecylphenol polyoxyethylene (7) ether, dodecylphenol polyoxyethylene (6) ether, dodecylphenol polyoxyethylene (9) ether, dodecylphenol polyoxyethylene (10) ether, or dodecylphenol polyoxyethylene (12) ether.

[0010] Furthermore, the fatty alcohol polyoxyethylene ether is selected from one or a combination of any proportions of AEO-3, AEO-4, AEO-6, MOA-3, MOA-4, or MOA-5.

[0011] Furthermore, the block polyether is selected from one or a combination of any proportions of block polyether L61, L62, L64, or D800.

[0012] Preparation method of the above-mentioned agricultural mineral oil emulsifier: According to the above metering ratio, stir and mix the castor oil polyoxyethylene ether, dodecylphenol polyoxyethylene ether, and block polyether evenly, then add the fatty alcohol polyoxyethylene ether, and stir and mix evenly at 40 - 45 °C to obtain the agricultural mineral oil emulsifier.

[0013] Application of the above-mentioned agricultural mineral oil emulsifier in the preparation of mineral oil emulsion: Add the above-mentioned agricultural mineral oil emulsifier to the mineral oil base oil, stir at a speed of 50 - 100 r / min for 30 - 40 min to obtain the mineral oil emulsion; the dosage of the agricultural mineral oil emulsifier accounts for 2 - 5% of the total mass of the mineral oil emulsion.

[0014] The mineral oil base oil is a refined mineral oil meeting the requirements of the Ministry of Agriculture and Rural Affairs, with an average carbon number of n-paraffins of 21 - 24 and a non-sulfonated value of over 92%.

[0015] Advantages of the present invention:

[0016] (1) The present invention provides an agricultural mineral oil emulsifier with simple preparation, environmental protection, and high efficiency. It has a good emulsifying effect on mineral oil and can well solve problems such as uneven dispersion and emulsification and demulsification that easily occur when using existing emulsifiers to emulsify mineral oil.

[0017] (2) After the mineral oil emulsifier of the present invention is mixed with the mineral oil base oil, the obtained mineral oil emulsion has a uniform and stable appearance, being colorless or light yellow. When diluted with water for use, the oil agent is uniformly dispersed in water, there is no floating oil on the surface of the emulsion, and the oil layer gradually precipitates after standing for 20 - 40 minutes, forming an oil film on the surface of insects to play an insecticidal role, which can well solve the problems such as easy occurrence of phytotoxicity, damage to the crop surface, and influence on the harvest during the application of existing mineral oil emulsions. Specific Embodiments

[0018] The technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments. The following embodiments are further descriptions of the present invention, rather than limitations on the present invention.

[0019] In the following embodiments and comparative examples, the mineral oil base oil used is GENERA 9 mineral oil, purchased from Total Company of France, but not limited thereto.

[0020] Example 1

[0021] A preparation method of an agricultural mineral oil emulsifier: Add 860 kg of castor oil polyoxyethylene ether (EL - 10), 100 kg of dodecylphenol polyoxyethylene (7) ether, and 25 kg of block polyether (L62) into a container, stir and mix for 10 minutes, then add 15 kg of fatty alcohol polyoxyethylene ether (AEO - 3), and stir and mix at 40 °C for 20 minutes to obtain the agricultural mineral oil emulsifier.

[0022] Preparation of the mineral oil emulsion: First, inject the agricultural mineral oil base oil into the reaction kettle, and then add the above - mentioned agricultural mineral oil emulsifier. The mass ratio of the agricultural mineral oil base oil to the agricultural mineral oil emulsifier is 49:1, and stir at a speed of 80 r / min for 30 min to obtain the mineral oil emulsion.

[0023] Perform heat storage stability and low - temperature stability tests on the prepared mineral oil emulsion. The heat storage stability test method refers to GBT 19136 - 2021, and the low - temperature stability test refers to GBT 19137 - 2003. The test results are as follows: After heat storage at 54 °C for 14 d, the appearance is transparent, without precipitation and stratification; after storage at 0 °C for 7 d, the appearance is transparent, without precipitation and stratification.

[0024] Dilute the prepared mineral oil emulsion 150 times with water. The oil agent is uniformly dispersed in water, there is no floating oil on the surface of the emulsion, and the oil layer gradually precipitates after standing for 25 minutes.

[0025] Example 2

[0026] Preparation method of an agricultural mineral oil emulsifier: Add 835 kg of castor oil polyoxyethylene ether (EL-10), 120 kg of dodecylphenol polyoxyethylene (6) ether, and 10 kg of block polyether (L64) into a container, stir and mix for 20 minutes, then add 35 kg of fatty alcohol polyoxyethylene ether (AEO-4), and stir and mix at 40 °C for 20 minutes to obtain the agricultural mineral oil emulsifier.

[0027] Preparation of mineral oil emulsion: First, inject the agricultural mineral oil base oil into the reaction kettle, and then add the above-mentioned agricultural mineral oil emulsifier. The mass ratio of the agricultural mineral oil base oil to the agricultural mineral oil emulsifier is 19:1, and stir at a speed of 80 r / min for 30 min to obtain the mineral oil emulsion.

[0028] The emulsified liquid has a uniform and stable liquid phase.

[0029] Perform heat storage stability and low-temperature stability tests on the prepared mineral oil emulsion. Test results: After heat storage at 54 °C for 14 d, the appearance is transparent, without precipitation and stratification; after storage at 0 °C for 7 d, the appearance is transparent, without precipitation and stratification.

[0030] Dilute the prepared mineral oil emulsion 150 times with water. The oil agent is evenly dispersed in water, and there is no floating oil on the surface of the emulsion. After standing for 31 minutes, the oil layer gradually precipitates.

[0031] Example 3

[0032] Preparation method of an agricultural mineral oil emulsifier: Add 600 kg of castor oil polyoxyethylene ether (EL-10), 290 kg of dodecylphenol polyoxyethylene (4) ether, and 56 kg of block polyether (L62) into a container, stir and mix for 20 minutes, then add 54 kg of fatty alcohol polyoxyethylene ether (AEO-3), and stir and mix at 40 °C for 20 minutes to obtain the agricultural mineral oil emulsifier.

[0033] Preparation of mineral oil emulsion: First, inject the agricultural mineral oil base oil into the reaction kettle, and then add the above-mentioned agricultural mineral oil emulsifier. The mass ratio of the agricultural mineral oil base oil to the agricultural mineral oil emulsifier is 49:1, and stir at a speed of 80 r / min for 30 min to obtain the mineral oil emulsion.

[0034] Perform heat storage stability and low-temperature stability tests on the prepared mineral oil emulsion. Test results: After heat storage at 54 °C for 14 d, the appearance is transparent, without precipitation and stratification; after storage at 0 °C for 7 d, the appearance is transparent, without precipitation and stratification.

[0035] Dilute the prepared mineral oil emulsion 150 times with water. The oil agent is evenly dispersed in water, and there is no floating oil on the surface of the emulsion. After standing for 22 minutes, the oil layer gradually precipitates.

[0036] Example 4

[0037] Preparation method of an agricultural mineral oil emulsifier: Add 715 kg of castor oil polyoxyethylene ether (EL-10), 150 kg of dodecylphenol polyoxyethylene (4) ether, and 45 kg of block polyether (L61) into a container, stir and mix for 40 minutes, then add 90 kg of fatty alcohol polyoxyethylene ether (AEO-3), and stir and mix at 40 °C for 20 minutes to obtain the agricultural mineral oil emulsifier.

[0038] Preparation of mineral oil emulsion: First, inject the agricultural mineral oil base oil into the reaction kettle, then add the above-mentioned agricultural mineral oil emulsifier. The mass ratio of the agricultural mineral oil base oil to the agricultural mineral oil emulsifier is 19:1, and stir at a speed of 80 r / min for 30 min to obtain the mineral oil emulsion.

[0039] Perform heat storage stability and low-temperature stability tests on the prepared mineral oil emulsion. Test results: After heat storage at 54 °C for 14 d, the appearance is transparent, without precipitation and stratification; after storage at 0 °C for 7 d, the appearance is transparent, without precipitation and stratification.

[0040] Dilute the prepared mineral oil emulsion 150 times with water. The oil agent is evenly dispersed in water, no floating oil appears on the surface of the emulsion, and the oil layer gradually precipitates after standing for 38 minutes.

[0041] Comparative Example 1

[0042] Preparation method of an agricultural mineral oil emulsifier: Add 730 kg of castor oil polyoxyethylene ether (EL-10), 200 kg of dodecylphenol polyoxyethylene (4) ether, and 70 kg of block polyether (L61) into a container, stir and mix for 40 minutes to obtain the agricultural mineral oil emulsifier.

[0043] Preparation of mineral oil emulsion: First, inject the agricultural mineral oil base oil into the reaction kettle, then add the above-mentioned agricultural mineral oil emulsifier. The mass ratio of the agricultural mineral oil base oil to the agricultural mineral oil emulsifier is 97:3, and stir at a speed of 80 r / min for 30 min to obtain the mineral oil emulsion.

[0044] Perform heat storage stability and low-temperature stability tests on the prepared mineral oil emulsion. Test results: After heat storage at 54 °C for 14 d, the appearance is transparent, without precipitation and stratification; after storage at 0 °C for 7 d, the appearance is transparent, with a small amount of precipitation.

[0045] Dilute the prepared mineral oil emulsion 150 times with water. The oil agent is evenly dispersed in water, no floating oil appears on the surface of the emulsion, and the oil layer gradually precipitates after standing for 9 minutes.

[0046] Comparative Example 2

[0047] Preparation method of an agricultural mineral oil emulsifier: Add 910 kg of castor oil polyoxyethylene ether (EL-10) and 90 kg of block polyether (L61) into a container, stir and mix for 60 minutes to obtain the agricultural mineral oil emulsifier.

[0048] Preparation of mineral oil emulsion: First, inject the agricultural mineral oil base oil into the reaction kettle, then add the above-mentioned agricultural mineral oil emulsifier. The mass ratio of the agricultural mineral oil base oil to the agricultural mineral oil emulsifier is 49:1, and stir at a speed of 80 r / min for 30 min to obtain the mineral oil emulsion.

[0049] Conduct thermal storage stability and low-temperature stability tests on the prepared mineral oil emulsion. Test results: After thermal storage at 54 °C for 14 d, the appearance is transparent, without precipitation and stratification; after storage at 0 °C for 7 d, the appearance is transparent, with more precipitation.

[0050] Dilute the prepared mineral oil emulsion 150 times with water. The oil agent is evenly dispersed in water, and there is no floating oil on the surface of the emulsion. After standing for 5 minutes, the oil layer gradually precipitates.

[0051] Comparative Example 3

[0052] Preparation method of an agricultural mineral oil emulsifier: Add 830 kg of castor oil polyoxyethylene ether (EL-10) and 80 kg of block polyether (L64) into a container, stir and mix for 40 minutes, then add 90 kg of fatty alcohol polyoxyethylene ether (AEO-4), and stir and mix at 40 °C for 20 minutes to obtain the agricultural mineral oil emulsifier.

[0053] Preparation of mineral oil emulsion: First, inject the agricultural mineral oil base oil into the reaction kettle, then add the above-mentioned agricultural mineral oil emulsifier. The mass ratio of the agricultural mineral oil base oil to the agricultural mineral oil emulsifier is 19:1, and stir at a speed of 80 r / min for 30 min to obtain the mineral oil emulsion.

[0054] Conduct thermal storage stability and low-temperature stability tests on the prepared mineral oil emulsion. Test results: After thermal storage at 54 °C for 14 d, the appearance is transparent, without precipitation and stratification; after storage at 0 °C for 7 d, the appearance is transparent, with trace precipitation.

[0055] Dilute the prepared mineral oil emulsion 150 times with water. The oil agent is evenly dispersed in water, and there is no floating oil on the surface of the emulsion. After standing for 7 minutes, the oil layer gradually precipitates.

[0056] Comparative Example 4

[0057] Preparation method of an agricultural mineral oil emulsifier: Add 895 kg of castor oil polyoxyethylene ether (EL-10) and 77 kg of block polyether (L61) into a container, stir and mix for 40 minutes, then add 28 kg of fatty alcohol polyoxyethylene ether (AEO-3), and stir and mix at 40 °C for 20 minutes to obtain the agricultural mineral oil emulsifier.

[0058] Preparation of mineral oil emulsion: First, inject the agricultural mineral oil base oil into the reaction kettle, and then add the above-mentioned agricultural mineral oil emulsifier. The mass ratio of the agricultural mineral oil base oil to the agricultural mineral oil emulsifier is 97:3, and stir at a speed of 80 r / min for 30 min to obtain the mineral oil emulsion.

[0059] Perform heat storage stability and low-temperature stability tests on the prepared mineral oil emulsion. Test results: After heat storage at 54 °C for 14 d, the appearance is transparent, without precipitation or stratification; after storage at 0 °C for 7 d, the appearance is transparent, with a small amount of precipitation.

[0060] Dilute the prepared mineral oil emulsion 150 times with water. The oil agent is evenly dispersed in water, and there is no floating oil on the surface of the emulsion. After standing for 12 minutes, the oil layer gradually precipitates.

Claims

1. An agricultural mineral oil emulsifier, with its total mass as 100%, characterized in that: The invention is composed of the following components in percentage by mass: 60-90% of castor oil polyoxyethylene ether, 6-30% of dodecylphenol polyoxyethylene ether, 1-10% of fatty alcohol polyoxyethylene ether and 1-10% of block polyether.

2. The agricultural mineral oil emulsifier according to claim 1, characterized in that The castor oil polyoxyethylene ether is selected from one of EL-10, EL-20, EL-36, BY-110, BY-112 and BY-125, or a combination of two or more in any proportion.

3. The agricultural mineral oil emulsifier according to claim 1, characterized in that The dodecylphenol polyoxyethylene ether is selected from one or a combination of any proportion of two or more of dodecylphenol polyoxyethylene (4) ether, dodecylphenol polyoxyethylene (7) ether, dodecylphenol polyoxyethylene (6) ether, dodecylphenol polyoxyethylene (9) ether, dodecylphenol polyoxyethylene (10) ether or dodecylphenol polyoxyethylene (12) ether.

4. The agricultural mineral oil emulsifier according to claim 1, characterized in that The fatty alcohol polyoxyethylene ether is selected from one of AEO-3, AEO-4, AEO-6, MOA-3, MOA-4 and MOA-5, or a combination of two or more in any proportion.

5. The agricultural mineral oil emulsifier according to claim 1, 2, 3 or 4, characterized in that: The block polyether is one of the block polyethers L61, L62, L64 or D800, or a combination of two or more in any proportion.

6. The method for preparing the agricultural mineral oil emulsifier according to any one of claims 1 to 5, characterized in that: Castor oil polyoxyethylene ether, dodecylphenol polyoxyethylene ether and block polyether are stirred and mixed evenly, and then fatty alcohol polyoxyethylene ether is added, and stirred and mixed evenly at 40-45° C. to obtain an agricultural mineral oil emulsifier.

7. Use of the agricultural mineral oil emulsifier according to any one of claims 1 to 5 in the preparation of mineral oil emulsions.

8. The use according to claim 7, characterized in that Add the agricultural mineral oil emulsifier according to any one of claims 1 to 5 to the mineral oil base oil, stir at a speed of 50-100 r / min for 30-40 min to obtain a mineral oil emulsion; the amount of the agricultural mineral oil emulsifier accounts for 2-5% of the total mass of the mineral oil emulsion.