A high-adhesion agricultural aerial application adjuvant and method of making same

Abstract

The application relates to A01N25 / 30, in particular to a high-adhesion agricultural aerial spraying aid and a preparation method thereof. According to mass percentages, the preparation raw materials comprise: 70-80% of vegetable oil, 10-20% of organic silicon, 3-8% of an emulsifier, 2-7% of a polyoxyethylene ether compound and 0.5-1.5% of an alkanolamide compound. The high-adhesion agricultural aerial spraying aid can effectively promote the deposition rate and adhesion of the pesticide on the crop leaf surface, reduce the sliding of the pesticide droplets, reduce the loss of the pesticide, and effectively promote the pesticide to play a role.

Description

TECHNICAL FIELD

[0001] The present application relates to A01N25 / 30, and particularly relates to a high-adhesion agricultural aerial spraying aid and a preparation method thereof. BACKGROUND

[0002] Based on the rapid development of plant protection unmanned aerial vehicle operation, conventional pesticide formulations and aerial spraying aid combinations have become the main means of current agricultural crop spraying. Among them, the aerial spraying aid has become an important aid for promoting plant protection unmanned aerial vehicle operation.

[0003] Patent CN20181150364 provides a kind of aerial spraying spray aid and its preparation method and application, with oil, emulsifier, auxiliary emulsifier as main preparation raw material obtained aerial spraying spray aid has the advantages of anti-evaporation, anti-drift, easy settlement, easy absorption etc.

[0004] Patent CN201811602031 a kind of aerial spraying aid and its preparation method and application with modified vegetable oil, fluorocarbon surfactant, ethoxylated polytrisiloxane, limonene etc. as main raw material preparation obtained aerial spraying aid has the excellent performance of high stability, anti-evaporation, anti-drift and increase of pesticide efficacy.

[0005] But because the surface of crop leaves has cutin layer, pesticide droplets are not easy to wet the surface, the adhesion of the aerial spraying aid prepared in the prior art is poor, which cannot effectively adhere to the leaf surface, so that the pesticide cannot fully play a role. SUMMARY

[0006] To solve the above technical problems, the first aspect of the present application provides a high-adhesion agricultural aerial spraying aid, and the preparation raw materials include, by mass percentage, 70-80% of vegetable oil, 10-20% of silicone, 3-8% of emulsifier, 2-7% of polyoxyethylene ether compound and 0.5-1.5% of alkanolamide compound.

[0007] Preferably, the vegetable oil is agricultural vegetable oil.

[0008] Preferably, the viscosity of the silicone at 25°C is 20-40cst.

[0009] Preferably, the surface tension of the silicone is 20.5-22.5mN / m.

[0010] Preferably, the cloud point of the silicone in 1wt% aqueous solution is 37-42°C.

[0011] Preferably, the silicone includes at least one of alcohol hydroxyl modified polysiloxane, polyether modified polysiloxane, amino modified polysiloxane and carboxyl modified polysiloxane.

[0012] Further preferably, the organosilicon comprises a polyether-modified polysiloxane.

[0013] Still further preferably, the organosilicon is a polyether-modified heptamethyltrisiloxane.

[0014] Preferably, the emulsifier solid content is ≥ 70 wt%.

[0015] Preferably, the emulsifier comprises calcium dodecylbenzenesulfonate.

[0016] Preferably, the solvent in the emulsifier is n-butanol.

[0017] Preferably, the polyoxyethylene ether compound has a cloud point of 70-90°C in a 1 wt% aqueous solution.

[0018] Preferably, the polyoxyethylene ether compound has an HLB value of 13-16.

[0019] Preferably, the polyoxyethylene ether compound comprises a first polyoxyethylene ether compound and a second polyoxyethylene ether compound. The mass ratio of the first polyoxyethylene ether compound to the second polyoxyethylene ether compound is (2-4):(5-7).

[0020] Preferably, the first polyoxyethylene ether compound has a cloud point of 70-84°C in a 1 wt% aqueous solution.

[0021] Preferably, the first polyoxyethylene ether compound has an HLB value of 13-14.

[0022] Preferably, the second polyoxyethylene ether compound has a cloud point of 85-90°C in a 1 wt% aqueous solution.

[0023] Preferably, the second polyoxyethylene ether compound has an HLB value of 14-15.5.

[0024] Preferably, the alkanolamide compound has an amine value of 80-120 mgKOH / g.

[0025] Preferably, the alkanolamide compound has an HLB value of 14-18.

[0026] Preferably, the alkanolamide compound comprises at least one of lauric acid monoethanolamide, oleic acid diethanolamide, cocodiethanolamide, and ricinoleic acid diethanolamide.

[0027] Further preferably, the alkanolamide compound comprises cocodiethanolamide.

[0028] Preferably, the cocodiethanolamide is obtained by condensation of coconut oil and diethanolamine at a mass ratio of 1:1.5.

[0029] Further preferably, the mass ratio of the emulsifier, the polyoxyethylene ether compound, and the alkanolamide compound is (4-6):(3-5):1.

[0030] The second aspect of the application provides a preparation method of the high-adhesion agricultural aerial spraying aid, comprising the following steps: dividing the vegetable oil into two parts, pumping the first part of the vegetable oil into a stirred tank, then sequentially pumping the silicone, the emulsifier, the polyoxyethylene ether compound, the alkanolamide compound, and finally pumping the second part of the vegetable oil to start stirring, and heating to 40-45°C, and keeping the temperature for 0.5 h to obtain the product.

[0031] Preferably, the mass ratio of the first part of the vegetable oil and the second part of the vegetable oil is (68-73):(2-7).

[0032] Advantages:

[0033] 1) The application provides a high-adhesion agricultural aerial spraying aid and a preparation method thereof. Through specific limitation of the types and contents of raw materials, the prepared agricultural aerial spraying aid can effectively promote the deposition rate and adhesion of the pesticide on the leaf surface of crops, reduce the sliding of pesticide droplets, reduce the loss of the pesticide, and effectively promote the function of the pesticide.

[0034] 2) The large fog droplets have strong anti-drift ability but poor wetting and spreading property in the operation of the plant protection unmanned aerial vehicle. The application effectively reduces the contact angle of the pesticide droplets on the surface of crops and improves the wetting and spreading ability of the fog droplets on the plant surface by using the polyether-modified heptamethyltrisiloxane with a viscosity of 20-40 cSt at 25°C, a surface tension of 21.5 mN / m, and a cloud point of 40°C in a 1 wt% aqueous solution. The prepared agricultural aerial spraying aid has higher coverage and adhesion, good rainwater resistance, and is especially suitable for the operation of the plant protection unmanned aerial vehicle in the rainy season.

[0035] 3) Research shows that the silicone can enhance the wetting and spreading ability of the pesticide, but has poor affinity with crops, which easily leads to pesticide coalescence and loss. The first polyoxyethylene ether compound (EL-40) with a saponification value of 57-67 mgKOH / g, a cloud point of 70-84°C in a 1 wt% aqueous solution, and an HLB value of 13-14, and the second polyoxyethylene ether compound (EL-60) with a cloud point of 85-90°C in a 1 wt% aqueous solution and an HLB value of 14-15.5 are used together to refine the particle size of the pesticide atomization, improve the uniformity of the pesticide atomization droplets, increase the deposition amount of the pesticide liquid, help kill pests in the hidden parts of the leaf surface and crevices of crops, avoid uneven distribution of the pesticide, and lead to less pesticide dosage on part of the leaf surface of crops, which cannot fully play a role. Especially, the mass ratio of (2-4):(5-7) is the best.

[0036] 4)The mass ratio of emulsifiers, polyoxyethylene ether compounds, and alkanolamide compounds is (4-6):(3-5):1, which increases the internal electrostatic repulsion of the system, improves the stability of particles in the system, has a higher cloud point, refines the particle size of pesticide droplets, significantly reduces evaporation, volatilization, and drift during the operation of the plant protection unmanned aerial vehicle, further promotes sedimentation and adhesion, effectively improves the effect and stability of pesticide prevention, and further avoids pesticide coalescence and loss.

[0037] 5)The present application further improves the stability of agricultural aerial application adjuvant by using plant oil and silicone together, and calcium dodecylbenzenesulfonate, polyoxyethylene ether compounds, and cocodihydroxyethanol compounds, which can play a role under a wider pH and temperature and humidity conditions, has the advantages of high stability, strong adhesion, good emulsification effect, etc. DETAILED DESCRIPTION

[0038] EMBODIMENT

[0039] EMBODIMENT 1

[0040] A high-adhesion agricultural aerial application adjuvant, the preparation raw materials include, by mass percentage: plant oil 75%, silicone 15%, emulsifier 5%, polyoxyethylene ether compound 4%, and alkanolamide compound 1%.

[0041] The plant oil is an agricultural plant oil, purchased from Guangzhou Oulian Biotechnology Co., Ltd., model: moisturizing expert agricultural plant oil.

[0042] The viscosity of the silicone at 25°C is 20-40cst, the surface tension is 21.5mN / m, and the cloud point in a 1wt% aqueous solution is 40°C. The silicone is polyether-modified heptamethyltrisiloxane (CAS number: 27306-78-1). Model: IOTA-2000, purchased from Anhui Aiyouta Silicone Co., Ltd.

[0043] The emulsifier includes calcium dodecylbenzenesulfonate. The content of calcium dodecylbenzenesulfonate in the emulsifier is ≥70wt%, and the moisture content is ≤0.5wt%. The solvent in the emulsifier is n-butanol. The emulsifier is purchased from Nantong Kenhe Chemical Co., Ltd., model 507.

[0044] The polyoxyethylene ether compound includes a first polyoxyethylene ether compound and a second polyoxyethylene ether compound. The mass ratio of the first polyoxyethylene ether compound and the second polyoxyethylene ether compound is 3:6. The saponification value of the first polyoxyethylene ether compound is 57-67 mgKOH / g, the cloud point in a 1 wt% aqueous solution is 70-84℃, the HLB value is 13-14, and the model is EL-40. The cloud point in a 1 wt% aqueous solution of the second polyoxyethylene ether compound is 85-90℃, the HLB value is 14-15.5, and the model is EL-60. The polyoxyethylene ether compounds are all purchased from Haian Petrochemical Factory in Jiangsu Province.

[0045] The amine value of the alkanolamide compound is 80-120 mgKOH / g, and the HLB value is 14-18. The alkanolamide compound is cocodihydroxyethylamide. The cocodihydroxyethylamide is obtained by condensation of coconut oil and diethanolamine at a mass ratio of 1:1.5. It is purchased from Nantong Gaokai Chemical Co., Ltd., and the model is 6501 (1:1.5).

[0046] A preparation method of a high-adhesion agricultural aerial application adjuvant, comprising the following steps: dividing plant oil into two parts at a mass ratio of 75:5, pumping the first part of the plant oil into a stirred tank, then sequentially pumping in silicone, emulsifier, polyoxyethylene ether compound, alkanolamide compound, and finally pumping in the second part of the plant oil to start stirring, and heating to 42℃ and maintaining for 0.5 h to obtain the product.

[0047] Example 2

[0048] A high-adhesion agricultural aerial application adjuvant, the specific implementation method is the same as that of Example 1, except that the mass ratio of the first polyoxyethylene ether compound and the second polyoxyethylene ether compound is 4:7.

[0049] Example 3

[0050] A high-adhesion agricultural aerial application adjuvant, the specific implementation method is the same as that of Example 1, except that the preparation raw materials include: plant oil 72%, silicone 17%, emulsifier 5.5%, polyoxyethylene ether compound 4.3%, and alkanolamide compound 1.2%.

[0051] Comparative Example 1

[0052] A high-adhesion agricultural aerial application adjuvant, the specific implementation method is the same as that of Example 1, except that the preparation raw materials include: plant oil 75%, silicone 15%, emulsifier 5.8%, polyoxyethylene ether compound 4%, and alkanolamide compound 0.2%.

[0053] Comparative Example 2

[0054] A high adhesion agricultural aerial application adjuvant, the detailed implementation same as example 1, the difference is that the viscosity of the organic silicon is 35 cst at 25℃, the surface tension is <20.5 mN / m, the cloud point is <10℃ at 1wt% aqueous solution, purchased from Weifang Naiyi Biological Technology Co., Ltd., model: L-66.

[0055] Performance test

[0056] 1. Adhesion test: refer to GB / T1720-2020 "Paint film circle test"

[0057] Table 1 Performance test results

[0058] Adhesion Example 1 Level 1 Example 2 Level 2 Example 3 Level 2 Comparative Example 1 Level 3 Comparative Example 2 Level 4

Claims

1. A high-adhesion agricultural fly control adjuvant, characterized in that: The raw materials for the preparation include, by mass percentage, 70-80% vegetable oil, 10-20% organosilicon, 3-8% emulsifier, 2-7% polyoxyethylene ether compound, and 0.5-1.5% alkanolamide compound; The viscosity of the silicone at 25°C is 20-40 cst; The polyoxyethylene ether compound includes a first polyoxyethylene ether compound and a second polyoxyethylene ether compound; the mass ratio of the first polyoxyethylene ether compound to the second polyoxyethylene ether compound is (2-4): (5-7); The cloud point of the first polyoxyethylene ether compound in a 1 wt % aqueous solution is 70-84° C.; The HLB value of the first polyoxyethylene ether compound is 13-14; The second polyoxyethylene ether compound has a cloud point of 85-90° C. in a 1 wt % aqueous solution; The HLB value of the second polyoxyethylene ether compound is 14-15.5; The amine value of the alkanolamide compound is 80-120 mgKOH / g; The mass ratio of the emulsifier, the polyoxyethylene ether compound and the alkanolamide compound is (4-6): (3-5):

1.

2. A highly adhesive agricultural fly control adjuvant according to claim 1, characterized in that: The surface tension of the silicone is 20.5-22.5 mN / m.

3. A highly adhesive agricultural fly control adjuvant according to claim 2, characterized in that: The organic silicon comprises at least one of alcohol hydroxyl modified polysiloxane, polyether modified polysiloxane, amino modified polysiloxane and carboxyl modified polysiloxane.

4. A highly adhesive agricultural fly control adjuvant according to claim 1, characterized in that: The HLB value of the alkanolamide compound is 14-18.

5. The high-adhesion agricultural fly control adjuvant according to claim 1, characterized in that: The alkanolamide compound includes at least one of lauric acid monoethanolamide, oleic acid diethanolamide, coconut oil diethanolamide, and castor oil diethanolamide.

6. A method for preparing a high-adhesion agricultural fly control adjuvant according to claim 1, characterized in that: The following steps are involved: Divide the vegetable oil into two parts, pump the first part of the vegetable oil into the stirring tank, then pump in silicone, emulsifier, polyoxyethylene ether compound, alkanolamide compound in sequence, and finally pump in the second part of the vegetable oil and start stirring, heat to 40-45°C, and keep warm for 0.5h.