CN111249773B - Defoaming agent for producing glyphosate aqueous solution and preparation method thereof - Google Patents
Defoaming agent for producing glyphosate aqueous solution and preparation method thereof Download PDFInfo
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- CN111249773B CN111249773B CN202010114539.5A CN202010114539A CN111249773B CN 111249773 B CN111249773 B CN 111249773B CN 202010114539 A CN202010114539 A CN 202010114539A CN 111249773 B CN111249773 B CN 111249773B
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- silicone oil
- defoaming agent
- glyphosate
- vinyl silicone
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/02—Foam dispersion or prevention
- B01D19/04—Foam dispersion or prevention by addition of chemical substances
- B01D19/0404—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D19/00—Degasification of liquids
- B01D19/02—Foam dispersion or prevention
- B01D19/04—Foam dispersion or prevention by addition of chemical substances
- B01D19/0404—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance
- B01D19/0409—Foam dispersion or prevention by addition of chemical substances characterised by the nature of the chemical substance compounds containing Si-atoms
Abstract
The invention discloses a defoaming agent for producing a glyphosate aqueous solution and a preparation method thereof, belonging to the technical field of production of glyphosate aqueous solutions. The defoaming agent comprises 8-12 parts of hydrogen-containing silicone oil, 3-7 parts of allyl polyether, 1-3 parts of olefin and 4-8 parts of vinyl silicone oil. The defoaming agent can be rapidly defoamed when added into the production process of the glyphosate aqueous solution, and can not generate foam or reduce the generation of foam by at least 80% for a long time in the use process of the glyphosate aqueous solution, so that the foam inhibition effect is achieved; the preparation method of the defoaming agent is simple to operate, mild in reaction condition and high in efficiency.
Description
Technical Field
The invention belongs to the technical field of production of glyphosate aqueous solution, and particularly relates to a defoaming agent for producing glyphosate aqueous solution and a preparation method thereof.
Background
Glyphosate, chemical name N-phosphonomethylglycine, the physicochemical properties of glyphosate: the pure product is white and tasteless solid, has a melting point of 230 ℃ and can be decomposed, the solubility of the glyphosate in water at 25 ℃ is 1.2g/100g, the solubility in water is low, and the glyphosate is difficult to dissolve in organic solvents such as absolute ethyl alcohol, ether, benzene and the like. The pH value of the pure water solution is about 2, and the sodium salt, ammonium salt and trimethylsulfonium salt of the glyphosate are easily dissolved in water.
Glyphosate must be absorbed by plants to enter plant bodies to achieve a weeding effect, and in the process, an auxiliary agent needs to be added, and the main functions of the auxiliary agent are as follows: the interfacial tension and the contact angle between the medicine drop and the wax layer on the surface of the blade are reduced, so that the medicine drop is smoothly spread; the capability of the medicine drops to penetrate through the wax layer on the surface of the blade is enhanced, so that the medicine drops can smoothly enter the plant body or the absorption of the plant to the medicine drops is promoted; the medicine drops are better dispersed and conducted in the plant body fluid until the medicine drops reach the life units of the plants.
The major currently used glyphosate adjuvants are: tallow amine ethoxylate, alkyl polyglycoside, fatty alcohol ethoxylate, organosilicon, betaine, amino acids, anti-drift agent, hard water agent, synergist, etc. Glyphosate is a low-toxicity, broad-spectrum, high-efficiency, non-selective post-emergence herbicide, can be conducted in plants, but can only be applied to foliar spray to show herbicidal activity. The quality of the weeding effect depends greatly on the selection of proper good auxiliary agents to improve the weeding activity.
However, the introduction of the adjuvant causes a large amount of foam during the production and use of the glyphosate aqueous solution, and a large amount of air is mixed during the stirring process of adding the adjuvant, so that a large amount of air bubbles are generated, and due to the introduction of the surfactant, the air bubbles are abnormally stable under the protection of the surfactant, so that the production is not facilitated, and the flushing is easy to generate. And the generation of a large amount of bubbles reduces the density of the system, is not beneficial to canning and influences the production efficiency. The traditional solutions are (1) reducing the feeding amount and the stirring speed, (2) shortening the standing time and waiting for the foam to disappear automatically, and (3) slowing down the feeding speed and avoiding the foam generated by impact. These points greatly affect the production efficiency. Therefore, the most effective method in the production process of the glyphosate aqueous solution is to add the defoaming agent. Defoamers are broadly classified into silicones, polyethers, mineral oils, higher alcohols and other special classes. The glyphosate aqueous solution added into the traditional defoaming agent causes aqueous solution mixing or has poor effect, and no special defoaming agent for the system exists in the current market. The generation of foam causes low production efficiency in the production process of the preparation and influences the productivity. And in the actual use process, a large amount of foam is also generated, thereby influencing the drug effect.
Disclosure of Invention
The invention aims to solve the technical problem of providing the defoaming agent for producing the glyphosate water aqua, and the defoaming agent has the advantages of simple raw material composition, easy obtainment and no pollution to the environment. The invention aims to solve another technical problem of providing a preparation method of the defoaming agent for producing the glyphosate aqueous solution, which has the advantages of simple operation, mild reaction conditions, high efficiency and batch production. The invention also provides an application of a defoaming agent in the production of a glyphosate aqueous solution, the defoaming agent can be rapidly defoamed when added into the production process of the glyphosate aqueous solution, and foam can not be generated or at least 80% of the foam can be reduced for a long time in the use process of the glyphosate aqueous solution, so that the foam inhibition effect is achieved.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
a defoaming agent for producing a glyphosate water agent comprises 8-12 parts of hydrogen-containing silicone oil, 3-7 parts of allyl polyether, 1-3 parts of olefin and 4-8 parts of vinyl silicone oil; the hydrogen-containing silicone oil is side chain hydrogen-containing silicone oil, terminal hydrogen-containing silicone oil or end side mixed hydrogen-containing silicone oil, and the hydrogen content is 0.05-0.75%; the molecular weight of the allyl polyether is 200-2000; the olefin is any one of long straight chain olefins from 1-butene to 1-octadecene; the vinyl silicone oil is terminal vinyl silicone oil, side chain vinyl silicone oil or end side mixed vinyl silicone oil, and the viscosity is 100-5000.
The hydrogen content of the hydrogen-containing silicone oil is 0.1 to 0.5 percent; the hydrogen-containing silicone oil is side chain hydrogen-containing silicone oil.
The allyl polyether is prepared by mixing polypropylene oxide and ethylene oxide with allyl as an initiator; the allyl polyether comprises 20-70% of propylene oxide and 30-60% of ethylene oxide, the HLB value of the product is adjusted by adjusting the feeding amount of propylene oxide and ethylene oxide, the molecular weight is adjusted by adjusting the proportion of propylene oxide, ethylene oxide and allyl alcohol, and the molecular weight is controlled to be 200-2000.
The molecular weight of the allyl polyether is 400-1200.
The antifoaming agent for producing glyphosate water agent is characterized in that the olefin is any one of long-chain olefins from 1-octylene to 1-dodecylene.
The defoaming agent for producing the glyphosate water agent is vinyl-terminated silicone oil; the viscosity of the vinyl silicone oil is 350-1000.
The preparation method of the defoaming agent for producing the glyphosate aqueous solution comprises the steps of putting allyl polyether into a reaction kettle, heating to 70-90 ℃, and keeping vacuum for 3-8 min; adding hydrogen-containing silicone oil, keeping the vacuum state for 3-8 min, adding a chloroplatinic acid isopropanol solution, controlling the temperature at 120-140 ℃, keeping the temperature for reaction for 0.5-1.5 h when the reaction is a transparent body, then adding olefin, reacting for 0.5-1.5 h, adding vinyl silicone oil, and reacting to obtain a transparent body, namely a finished defoamer; the dosage ratio of the chloroplatinic acid isopropanol solution to the allyl polyether is 180-230 g:1mL, and the concentration of the chloroplatinic acid isopropanol solution is 1%.
The application of the defoaming agent in the production of glyphosate water aqua.
The application of the defoaming agent in the production of the glyphosate aqueous solution comprises that the dosage of the defoaming agent is 0.2-0.5 percent of the dosage of the glyphosate aqueous solution.
Has the advantages that: compared with the prior art, the invention has the advantages that:
(1) the defoaming agent can be rapidly defoamed when added into the production process of the glyphosate aqueous solution, and can not generate foam or reduce the generation of foam by at least 80 percent for a long time in the use process of the glyphosate aqueous solution, thereby achieving the foam inhibition effect.
(2) The defoaming agent does not cause turbidity of the glyphosate aqueous solution after being added into the production process of the glyphosate aqueous solution, and ensures the clarity and the transparency of the glyphosate aqueous solution.
(3) After the defoaming agent is added, no floccule can float on the surface of the glyphosate aqueous solution, and no floccule can appear in the system.
(4) When the glyphosate aqueous solution is actually used, particularly when the glyphosate aqueous solution is mechanically sprayed abroad, the foam can be effectively reduced, and the drug effect is improved.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with examples are described in detail below.
Example 1
92.25kg of allyl polyether with the molecular weight of 450 (ethylene oxide accounts for 50 percent) is added into a reaction kettle, the temperature is raised to 80 ℃, the vacuum is kept for 5min, and because the polyether generally has a small amount or trace amount of water, dehydration is needed before adding the hydrogen-containing silicone oil, the hydrogen-containing silicone oil is prevented from being preferentially hydrolyzed after being added, and the hydrolyzed hydrogen-containing silicone oil is easy to crosslink. And then adding 225kg of side chain hydrogen-containing silicone oil (the hydrogen content is 0.18%), keeping the vacuum state for 5min, adding 500mL of 1% chloroplatinic acid isopropanol solution under the protection of nitrogen, controlling the temperature at 120-140 ℃, preserving the temperature for 1h when the reaction is transparent, then adding 14.36kg of 1-octene, reacting for 1h, adding 101.5kg of vinyl silicone oil with the viscosity of 500, and reacting to obtain the transparent product.
Example 2
Adding 132.7kg of allyl polyether (ethylene oxide accounts for 30%) with the molecular weight of 720 into a reaction kettle, heating to 80 ℃, keeping the vacuum for 5min, adding 225kg of side chain hydrogen-containing silicone oil (the hydrogen content is 0.18%), keeping the vacuum for 5min, adding 600mL of 1% chloroplatinic acid isopropanol solution under the protection of nitrogen, controlling the temperature to be 120-140 ℃, keeping the temperature for reaction for 1h when the reaction is transparent, adding 82.5kg of vinyl silicone oil with the viscosity of 1000, adding 11.4kg of 1-dodecene after the reaction for 1h, and reacting to obtain the transparent product.
Example 3
The antifoaming agent in example 1 and example 2 is used in the production of aqueous glyphosate, and the production process is as follows:
putting 1000kg of glyphosate technical and deionized water into a blending kettle, stirring for 20min, controlling the temperature to be 30-40 ℃, adding 340kg of isopropylamine salt, preserving the temperature, adding glyphosate auxiliary agent (alkyl glycoside), and adding a defoaming agent when the reaction is finished. The antifoaming agents prepared in example 1 and example 2 were used as antifoaming agents, and the antifoaming agents selected in the control group were silicone emulsion and polyether, and the results are shown in table 1 (the amount of the antifoaming agent in table 1 is the percentage of the aqueous glyphosate agent):
TABLE 1 results of experiments with different types of antifoam
As can be seen from Table 1, the defoaming agent products in examples 1 and 2 can effectively defoam and inhibit foam in the process of producing glyphosate aqueous solution, and have no side effect compared with the traditional defoaming agent.
Claims (3)
1. The application of the defoaming agent in the production of the glyphosate water aqua is characterized in that the defoaming agent consists of 8-12 parts of hydrogen-containing silicone oil, 3-7 parts of allyl polyether, 1-3 parts of olefin and 4-8 parts of vinyl silicone oil; the hydrogen-containing silicone oil is side chain hydrogen-containing silicone oil, and the hydrogen content is 0.1-0.5%; the molecular weight of the allyl polyether is 400-1200; the olefin is any one of long straight chain olefins from 1-octaolefin to 1-dodecene; the vinyl silicone oil is terminal vinyl silicone oil, side chain vinyl silicone oil or end side mixed vinyl silicone oil, and the viscosity is 100-5000;
putting allyl polyether into a reaction kettle, heating to 70-90 ℃, and keeping vacuum for 3-8 min; adding hydrogen-containing silicone oil, keeping the vacuum state for 3-8 min, adding a chloroplatinic acid isopropanol solution, controlling the temperature at 120-140 ℃, keeping the temperature for reaction for 0.5-1.5 h when the reaction is a transparent body, then adding olefin, reacting for 0.5-1.5 h, adding vinyl silicone oil, and reacting to obtain a transparent body, namely a finished defoamer; the dosage ratio of the chloroplatinic acid isopropanol solution to the allyl polyether is 180-230 g:1mL, and the concentration of the chloroplatinic acid isopropanol solution is 1%;
the dosage of the defoaming agent is 0.2-0.5% of the glyphosate aqueous solution.
2. The use of the defoamer of claim 1 in the production of aqueous glyphosate solutions, wherein said allyl polyether is prepared by mixing polypropylene oxide and ethylene oxide with allyl as initiator; the allyl polyether comprises 20-70% of propylene oxide and 30-60% of ethylene oxide by mass.
3. The use of the defoamer of claim 1 in the production of aqueous glyphosate solutions, wherein the vinyl silicone oil is a terminal vinyl silicone oil; the viscosity of the vinyl silicone oil is 350-1000.
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| WO2001087063A2 (en) * | 2000-05-17 | 2001-11-22 | Crompton Corporation | Agricultural compositions employing organosiloxanes containing polyhydric groups |
| US8551533B2 (en) * | 2011-05-09 | 2013-10-08 | Momentive Performance Materials Inc. | Adjuvant composition and agrochemical formulation containing same |
| US10188102B2 (en) * | 2015-07-15 | 2019-01-29 | Momentive Performance Materials Inc. | Low foam surfactant composition and methods of making the same |
| US20190281831A1 (en) * | 2016-05-27 | 2019-09-19 | Dow Global Technologies Llc | Foam control agent and compositions thereof |
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| GB2257709A (en) * | 1991-07-18 | 1993-01-20 | Dow Corning Sa | Silicone foam control agent |
| JPH05194861A (en) * | 1991-07-18 | 1993-08-03 | Dow Corning Sa | Silicone foam modifier |
| EP0663225A1 (en) * | 1993-12-28 | 1995-07-19 | Dow Corning Corporation | Foam control compositions |
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| CN104436767A (en) * | 2014-12-24 | 2015-03-25 | 南京四新科技应用研究所有限公司 | Organic-silicon composition, preparation and application thereof |
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Effective date of registration: 20220802 Address after: No. 51-2, Xinhai Avenue, economic development zone, Xuyi county, Huai'an City, Jiangsu Province, 223000 Patentee after: Jiangsu kezhixin environmental protection material Co.,Ltd. Address before: 210019 floor 2, building 3, No. 18, Jialing Jiangdong Street, Jianye District, Nanjing, Jiangsu Province Patentee before: Nanjing yingweilai New Material Co.,Ltd. |
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