CN107353134B - Special anti-caking agent for humic acid urea - Google Patents
Special anti-caking agent for humic acid urea Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/20—Mixtures of one or more fertilisers with additives not having a specially fertilising activity for preventing the fertilisers being reduced to powder; Anti-dusting additives
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Abstract
The invention discloses a special anti-caking agent for humic acid urea. The water-in-oil type anti-blocking agent consists of 40-80% of base oil, 10-40% of hydrophobic organic compound, no more than 10% of surfactant, no more than 10% of crystal control agent and no more than 5% of water. The anti-caking agent is a water-in-oil type anti-caking agent, can effectively prevent humic acid urea from caking, can also effectively prevent humic acid urea from crystallizing, can improve the quality of humic acid urea products, has simple and efficient preparation process, and is suitable for industrial preparation.
Description
Technical Field
The invention belongs to the fields of fine chemical engineering and chemical fertilizer additives, relates to a chemical fertilizer additive, and particularly relates to a special anti-caking agent for humic acid urea as well as a preparation method and application thereof.
Background
The humic acid urea is more and more popular in the market because of the high fertilizer efficiency and the sustained and controlled release effect. However, the critical relative hygroscopicity of humic acid urea is low, so that the humic acid urea is easy to absorb moisture to cause caking and pulverization, and the humic acid urea is easy to crystallize on the surface (commonly called 'growing white hair') to influence the appearance of the product, so that the caking is caused. Therefore, how to prevent the humic acid urea from caking and crystallizing, improve the product quality, reduce the addition cost, make the humic acid urea more acceptable for users and have more market competitiveness becomes the problem that needs to be solved by fertilizer manufacturers.
At present, in addition to taking precautions during production, packaging and storage, the addition of an anti-caking agent is the most effective way to solve this problem. At present, the common chemical fertilizer anti-caking agents at home and abroad can be mainly divided into the following types: 1. the powdery anti-caking agent generally takes inert powder such as silicon dioxide, talcum powder or kaolin as raw materials, and although the cost of the powdery anti-caking agent is low, the anti-caking effect is poor, and dust pollutes the environment in use; 2. the anti-caking agent is a paste anti-caking agent, wherein oil is usually taken as base oil, and hydrophobic substances such as paraffin, polyolefin, chlorosilane and fatty acid are added, so that the anti-caking agent is most widely applied at present and has a good anti-caking effect, but heating and heat preservation measures are required in the adding process; 3. the water-soluble liquid anti-caking agent takes water as a matrix, raw materials such as a film forming agent and a surfactant are added as main materials, and the anti-caking agent is prevented from caking through the amphipathy and the crystal control effect of the surfactant.
At present, few reports are made at home and abroad for humic acid urea anti-caking agents. Professor Huajianli of Huadong university of physical engineering develops an anti-caking agent specially used for large-particle urea, the anti-caking agent is prepared by taking octadecylamine or hydrogenated tallow amine and paraffin as raw materials, a hydrophobic layer is formed on the surface of urea particles to play a role of anti-caking, the caking rate is 12.7% after the anti-caking agent is applied to urea, but the anti-caking agent cannot solve the problem of humic acid urea crystallization. CN102746068 discloses an anti-caking agent for urea, which is a water-soluble liquid anti-caking agent and has the advantages of good anti-caking effect, convenient adding mode, environmental friendliness and the like, but the anti-caking agent can not solve the problem of humic acid urea crystallization.
Disclosure of Invention
Aiming at the problems of humic acid urea in the prior art, in particular to the problems of easy caking and crystallization of humic acid urea, the invention carries out analysis and research on the problems of caking and surface crystallization of humic acid urea, and finally forms the invention.
The invention aims to provide a special anti-caking agent for urea humate, which is used for preventing urea humate from caking and crystallizing, and can solve the problem of urea humate caking and the problem of urea humate particle surface crystallization.
The invention also aims to provide a preparation method of the special anti-caking agent for the humic acid urea, and the industrial preparation of the anti-caking agent is realized.
The invention also aims to provide application of the anti-caking agent.
In order to realize the purpose, the invention adopts the following technical scheme:
the invention provides a special anti-caking agent for humic acid urea, which is a water-in-oil anti-caking agent consisting of base oil, a hydrophobic organic compound, a surfactant, a crystallization control agent and water.
In the anti-caking agent, base oil: 40% -80%, hydrophobic organic compound: 10% -40%, surfactant: no more than 10%, crystal control agent: not more than 10%, water: not more than 5%.
The second aspect of the invention provides a preparation method of a special anti-caking agent for urea humate, which comprises the following steps:
(1) mixing base oil and hydrophobic organic compound, heating and stirring until all the base oil and the hydrophobic organic compound are dissolved and uniformly mixed;
(2) adding the surfactant according to the proportion, continuously stirring, and stopping heating after uniformly mixing;
(3) mixing the crystal control agent and water in proportion, and stirring until the crystal control agent is completely dissolved;
(4) after the mixture in the step (2) is cooled, adding the aqueous solution prepared in the step (3) into the mixture,
stirring until the mixture is uniformly mixed to obtain the anti-caking agent.
In a third aspect of the invention, the application of the anti-caking agent is provided, and in particular, the application of the anti-caking agent in preventing humic acid urea from caking and/or surface crystallization is provided.
Based on this application, the present invention provides a method for preventing urea humic acid from caking and/or surface crystallization, comprising the step of applying the above anti-caking agent to urea humic acid.
The technical scheme of the invention has the following beneficial effects:
(1) the invention provides a special anti-caking agent for humic acid urea, which is a water-in-oil type anti-caking agent and can effectively prevent humic acid urea from caking and crystallizing.
(2) The anti-caking agent disclosed by the invention is simple and efficient in preparation process and suitable for industrial preparation.
(3) The anti-caking agent is atomized by a spray head and then added to the surface of humic acid urea particles, so that a hydrophobic layer is formed on the particles, the particles are prevented from absorbing moisture, caking and pulverization are prevented, and the surface crystallization of the humic acid urea particles can be effectively inhibited, so that the phenomenon of 'white hair growth' of the particles is prevented, and the product quality is improved.
(4) The anti-caking agent can effectively solve the problems of humic acid urea caking and surface crystallization only by using the paste, has good anti-caking effect, and has simpler operation process and low cost compared with the traditional paste and powder.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, and/or combinations thereof, unless the context clearly indicates otherwise.
The term "urea humate" as used herein refers to powder material mainly containing humic acid and urea as fertilizer effective components, which is prepared by mixing humic acid, urea and water at a certain ratio, heating to react, standing, aging to obtain porous urea humate complex with high water content, drying, and pulverizing to obtain loose particulate urea humate.
As described in the background, there is no effective special anti-caking agent for humic acid urea. Based on the above, the invention provides a special anti-caking agent for humic acid urea and a preparation method and application thereof.
In one embodiment of the invention, the special anti-caking agent for the urea humate is provided, and the water-in-oil type anti-caking agent is composed of base oil, a hydrophobic organic compound, a surfactant, a crystallization control agent and water.
In the anti-caking agent, base oil: 40% -80%, hydrophobic organic compound: 10% -40%, surfactant: no more than 10%, crystal control agent: not more than 10%, water: not more than 5%.
The invention adopts base oil, hydrophobic substances, surfactant and crystal control agent to compound the water-in-oil type anti-caking agent, and the anti-caking agent can effectively solve the problems of easy caking and crystallization of humic acid urea.
In preferred embodiments, the base oil includes, but is not limited to, vegetable oils selected from soybean oil, palm oil, peanut oil, rapeseed oil, and the like, and may also include recycled waste oils such as drainage oil and the like; the animal fat and oil is selected from adeps medulla bovis Seu Bubali, adeps Caprae Seu Ovis, etc.
In a preferred embodiment of the invention, the anti-caking agent with the base oil as the transgenic soybean oil has better anti-caking effect, has better adaptability with hydrophobic organic matters, surfactants and crystallization control agents, can effectively play the role of an oily carrier, and better forms a w/o type emulsifier.
The content of the base oil is sufficient for the oil carrier to form the water-in-oil emulsifier, and the content of the base oil can be 40%, 50%, 60%, 70%, 80%, and in the preferred embodiment of the invention, the content of the base oil is 50% -60%.
The hydrophobic organic compound refers to a weak polar or non-polar organic substance, and in a preferred embodiment of the invention, the hydrophobic organic compound is selected from one or more of paraffin, primary octadecyl amine, stearic acid and oleamide. The hydrophobic organic compound can form a hydrophobic layer on humic acid urea particles under the action of a base oil carrier, a surfactant and the like, so that the particles are effectively prevented from absorbing moisture, and the anti-caking effect is achieved.
The content of the hydrophobic organic compound is preferably 20%, 25%, 30%, 35%, 40% to cover the surface of the particles to form a complete hydrophobic layer. The content of the hydrophobic organic compound is not easy to be too high, otherwise the formation of a water-in-oil system is influenced.
The surfactant of the present invention is preferably a nonionic surfactant, and in a preferred embodiment of the present invention, the surfactant is selected from one or more of alkylphenol ethoxylates, sorbitol fatty acid ester polyoxyethylene ether, and fatty alcohol polyoxyethylene ether. The alkylphenol ethoxylates include OP series emulsifiers (condensates of alkylphenols with ethylene oxide) such as OP-4, OP-7, OP-10, OP-15, OP-20 and the like and NP series emulsifiers such as NP-7, NP-10 and the like; sorbitol fatty acid esters (span series) including S-20, S-40, S-60, S-80, etc.; the sorbitol fatty acid ester polyoxyethylene ether (Tween series) comprises Tween-20, Tween-40, Tween-60, Tween-80, Tween-85, etc.; the fatty alcohol-polyoxyethylene ether comprises AEO-5, AEO-7, AEO-9, etc.
Based on the requirement of the water-in-oil type anti-caking agent, the surfactant is selected to be a surfactant suitable for constructing a w/o system, and the dosage of the surfactant is also used for meeting the requirement of forming the w/o system. In preferred embodiments, the amount of surfactant may be 2%, 3%, 4%, 5%, 6%, 7%, 8%; in a more preferred embodiment, the surfactant is present in an amount of 5% to 6%.
In a preferred embodiment of the present invention, the crystal control agent is one or a combination of two or more selected from dodecyl sulfonate, dodecyl sulfate, dodecyl benzene sulfonate, dodecyl sulfonate, hexadecyl sulfonate and hexadecyl benzene sulfonate.
In a more preferred embodiment of the invention, the crystallization control agent is selected from one or a combination of more than two of dodecyl sulfonate, dodecyl sulfate and dodecyl benzene sulfonate, which can effectively solve the problem of surface crystallization of urea humate, and the surface crystallization of urea humate particles is less or no.
The addition of the crystal control agent is one of important factors of the special type of the humic acid urea, and the crystal control agent is not only effectively blended into the composition of the water-in-oil type anti-caking paste to enhance the anti-caking effect, but also effectively inhibits the surface crystallization phenomenon of the humic acid urea, prevents pulverization and improves the quality of fertilizer products.
The addition amount of the crystal control agent is not too high, and can be 1%, 2%, 3%, 4%, 5%, 6%, 7% and 8%, and in a preferred embodiment, the addition amount of the crystal control agent is 1.5% to 3%. In a more preferable embodiment, the compounding effect of the crystal control agent which adopts dodecyl sulfate and dodecyl benzene sulfonate is better, and when the ratio of the dodecyl sulfate to the dodecyl benzene sulfonate is 1:1-1:2, the crystal control agent has an excellent effect of inhibiting the surface crystallization of the urea humate.
A preferred embodiment of the invention is a special anti-caking agent for urea humate, which is a water-in-oil type anti-caking agent consisting of 60 parts by weight of transgenic soybean oil, 10 parts by weight of paraffin, 10 parts by weight of primary amine, 12 parts by weight of stearic acid, 5 parts by weight of oleamide, OP-103 parts by weight, 803 parts by weight of span, 2 parts by weight of dodecylbenzene sulfonic acid, 1 part by weight of sodium dodecyl sulfate and 3 parts by weight of water.
In another embodiment of the invention, a preparation method of the special anti-caking agent for urea humate is provided, and the preparation method comprises the following steps:
(1) mixing base oil and hydrophobic organic compound, heating and stirring until all the base oil and the hydrophobic organic compound are dissolved and uniformly mixed;
(2) adding the surfactant according to the proportion, continuously stirring, and stopping heating after uniformly mixing;
(3) mixing the crystal control agent and water in proportion, and stirring until the crystal control agent is completely dissolved;
(4) and (3) after the mixture in the step (2) is cooled, adding the water aqua prepared in the step (3) into the mixture, and stirring until the mixture is uniformly mixed to obtain the anti-caking agent.
In the preparation method, the steps (1) to (4) do not refer to the limitation of the operation sequence, and the step (3) can be completed before the step (1) or before the step (2) according to the present invention.
In a preferred embodiment of the present invention, the temperature for heating and stirring in step (1) is 100-120 ℃; more preferably, the temperature of the heating and stirring in the step (1) is 110 ℃.
In the preferred embodiment of the invention, in the step (4), after the temperature of the mixture in the step (2) is reduced to 85-95 ℃, the water aqua prepared in the step (3) is added into the mixture, and the mixture is stirred until the mixture is uniformly mixed, so that the anti-caking agent is obtained. The obtained anti-caking agent is a paste.
In another embodiment of the invention, the use of the above anti-caking agent is provided, in particular, the use of the above anti-caking agent for preventing humic acid urea caking and/or surface devitrification is provided.
Based on this application, the present invention provides a method for preventing urea humic acid from caking and/or surface crystallization, comprising the step of applying the above anti-caking agent to urea humic acid.
In a preferred embodiment, the anti-caking agent of the present invention is applied by: and conveying the anti-caking agent which is heated and dissolved in advance to a spray head through a metering pump, and adding the anti-caking agent to the surface of humic acid urea particles after atomization by the spray head. Specifically, the anti-caking agent is heated and dissolved at 90 ℃.
Humic acid urea caking rate test
The caking rate is determined by adopting a laboratory rapid experiment method, and the test fertilizer adopts humic acid urea produced by a Henan Xin compound fertilizer factory. The method comprises the following specific steps:
1. humic acid urea pretreatment: and (4) screening out large particles by using a screen with the aperture of 6mm to obtain a compound fertilizer sample without large particles. And heating part of the compound fertilizer sample to 40-50 ℃, and adding a proper amount of anti-caking agent for treatment.
2. Taking a culture dish with the diameter of 6cm, weighing the culture dish, and recording the weight as m1Adding about 20g of compound fertilizer sample treated with anti-caking agent into a culture dish, weighing the total weight of the culture dish and the sample, and recording m2. A stainless steel net is placed on the surface of urea, and a weight of 100g is pressed on the stainless steel net to simulate a real stack.
3. Putting the sample into a constant temperature and humidity box with the temperature of 35 ℃ and the humidity of 80%, taking out after 3.5h, removing the weight and the stainless steel mesh, weighing the culture dish and the compound fertilizer, and recording m3And putting the sample into a vacuum oven with the temperature of 35 ℃ and the pressure of-0.02 MPa for drying.
4. Taking out the dried sample, inverting to 6cm from the desktop height to allow the sample to freely fall, screening the fallen sample with a screen with 6mm aperture, inverting the sample remained on the screen to the culture dish, weighing the culture dish and the sample, and recording m4.
5. The compound fertilizer treated by the anti-caking agent is used as a blank control test sample, and the same operation is carried out at the same time. And (3) calculating the result:
caking rate
Example 1
60 parts of base oil, 15 parts of paraffin, 8 parts of octadecyl primary amine, 10 parts of stearic acid, OP-103, 804, 10 parts of oleamide and 3 parts of water are taken according to the parts by weight to prepare the ointment. Wherein, three pastes are obtained by respectively using swill-cooked dirty oil, transgenic soybean oil and palm oil as base oil, and the three pastes are subjected to comparative test according to the rapid test method. The experimental results are shown in the following table 1, and the anti-caking effect of the transgenic soybean oil is better than that of the other two base oils. The base oil was determined to be transgenic soybean oil.
TABLE 1
| Sample (I) | Illegal cooking oil | Palm oil | Transgenic soybean oil | Blank space |
| Caking rate | 11.8％ | 9.3％ | 7.6％ | 75.9％ |
| Presence or absence of devitrification on the surface of the particles | Is provided with | Is provided with | Is provided with | Is provided with |
Example 2
60 parts of transgenic soybean oil, 10 parts of paraffin, 10 parts of primary octadecyl amine, 12 parts of stearic acid, OP-103, 803 parts of span and 10 parts of oleamide are taken according to the parts by weight to prepare paste for an anti-caking test. The results are shown in table 2 below, with test results: the anti-caking effect of the formula after adjustment is obviously improved, but the crystallization problem can not be controlled.
TABLE 2
| Sample (I) | Ointment preparation | Blank space |
| Caking rate | 4.78％ | 74.6％ |
| Presence or absence of devitrification on the surface of the particles | There is much devitrification | There is much devitrification |
Example 3
Preparing transgenic soybean oil 60, paraffin 10, octadecyl primary amine 10, stearic acid 12, OP-103, span 803, oleamide 5, a crystal control agent 2 and water 3 into paste according to the parts by weight, wherein sodium dodecyl benzene sulfonate and sodium dodecyl sulfate are respectively used as the crystal control agents to obtain paste 1 and paste 2.
The anti-caking paste has the following processing process:
firstly, heating and stirring a mixture of transgenic soybean oil, paraffin, primary octadecyl amine, stearic acid and oleamide at 110 ℃ until all the mixture is completely dissolved and uniformly mixed.
And secondly, adding 0P-10 and span 80 according to the proportion, continuously stirring, and stopping heating after uniformly mixing.
And thirdly, mixing the crystal control agents (sodium dodecyl benzene sulfonate and sodium dodecyl sulfate) and water according to a proportion, and stirring until the sodium dodecyl benzene sulfonate and the sodium dodecyl sulfate are completely dissolved.
And step four, after the temperature of the mixture is reduced to 85-95 ℃, adding the aqueous solution prepared in the step three into the mixture, and continuously stirring until the mixture is uniformly mixed to obtain the product paste.
The anti-caking test results are shown in the following table 3, and the test results show that the caking rate is not improved, but the crystallization phenomenon on the particle surface is obviously improved after a small amount of crystal control agent is added.
TABLE 3
| Sample (I) | Paste 1 | Paste 2 | Blank space |
| Caking rate | 5.23％ | 4.97％ | 76.7％ |
| Presence or absence of devitrification on the surface of the particles | Slightly devitrified and less than before | Slightly devitrified and less than before | Has devitrification |
Example 4
The transgenic soybean oil 60, the paraffin 10, the primary octadecyl amine 10, the stearic acid 12, the OP-103, the span 803, the oleamide 5, the sodium dodecyl sulfate 1, the sodium dodecyl benzene sulfonate 1 and the water 3 are taken according to the parts by weight and processed according to the processing procedures of the embodiment 3.
The anti-caking test results are shown in the following table 4, and the test results show that the caking rate is improved and the grain surface crystallization phenomenon is further obviously improved after a small amount of crystal control agent components are adjusted.
TABLE 4
| Sample (I) | Ointment preparation | Blank space |
| Caking rate | 3.71％ | 75.2％ |
| Presence or absence of devitrification on the surface of the particles | There was very little devitrification, less than in case 3 | Has devitrification |
Example 5
According to the formulation of example 4, paste 3 and paste 4 were obtained by adjusting the ratio of sodium dodecylsulfate to sodium dodecylbenzenesulfonate to 1:0.5 and 1:2, respectively, and then tested.
The anti-caking test results are shown in the following table 5, and the test results show that after a small amount of crystal control agent components are further adjusted (the ratio of sodium dodecyl sulfate to sodium dodecyl benzene sulfonate in the crystal control agent is 1:2), the caking rate is further improved (only about 1 percent), and the particle surface has no crystallization phenomenon.
TABLE 5
| Sample (I) | Paste 3 | Ointment 4 | Blank space |
| Caking rate | 4％ | 1.1％ | 74.9％ |
| Presence or absence of devitrification on the surface of the particles | Slightly devitrified | Without crystallization | Has devitrification |
Example 6
The special anti-caking agent for humic acid urea is obtained by processing according to the formula shown in Table 6, and the processing steps are as follows:
firstly, heating and stirring a mixture of transgenic soybean oil, paraffin, primary octadecyl amine, stearic acid and oleamide at 110 ℃ until all the mixture is completely dissolved and uniformly mixed.
And secondly, adding 0P-10 and span 80 according to the proportion, continuously stirring, and stopping heating after uniformly mixing.
And thirdly, mixing the sodium dodecyl benzene sulfonate, the sodium dodecyl sulfate and the water according to a proportion, and stirring until the sodium dodecyl benzene sulfonate and the sodium dodecyl sulfate are completely dissolved.
Fourthly, after the temperature of the mixture is reduced to 85-95 ℃, adding the aqueous solution prepared in the third step into the mixture, and continuously stirring the mixture until the mixture is uniformly mixed to obtain the product paste
The product paste is subjected to a production experiment in a fertilizer plant. The test samples are stacked to 20 heights, each bag is packed by 50kg, and the test samples are unpacked after half a year to check the results.
The experimental results are as follows: the agglomeration rate is 1.09%, the surface of the particles has no crystallization, and the particles have no pulverization phenomenon. Therefore, the water-in-oil type anti-caking agent can effectively prevent humic acid urea from caking and prevent humic acid urea from crystallizing, and has lasting effect control.
TABLE 6
| Raw materials | Proportion (parts by weight) | Raw materials | Proportion (parts by weight) |
| Transgenic soybean oil | 60 | OP-10 | 3 |
| Paraffin wax | 10 | Span 80 | 3 |
| Octadecyl Primary amine | 10 | Sodium dodecyl benzene sulfonate | 2 |
| Stearic acid | 12 | Sodium dodecyl sulfate | 1 |
| Oleic acid amides | 5 | Water (W) | 3 |
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (5)
1. The special anti-blocking agent for humic acid urea is characterized by comprising, by weight, 60 parts of transgenic soybean oil, 10 parts of paraffin, 10 parts of primary octadecyl amine, 12 parts of stearic acid, OP-103 parts, 803 parts of span, 5 parts of oleamide, 1 part of sodium dodecyl sulfate, 2 parts of sodium dodecyl benzene sulfonate and 3 parts of water.
2. A preparation method of the special anti-caking agent for humic acid urea as defined in claim 1, which is characterized in that the preparation method comprises the following steps:
(1) mixing transgenic soybean oil, paraffin, primary octadecyl amine, stearic acid and oleamide, heating and stirring until all the components are dissolved and uniformly mixed;
(2) adding OP-10 and span 80 in proportion, continuing stirring, and stopping heating after uniformly mixing;
(3) mixing sodium dodecyl sulfate, sodium dodecyl benzene sulfonate and water in proportion, and stirring until the sodium dodecyl sulfate, the sodium dodecyl benzene sulfonate and the water are completely dissolved;
(4) after the mixture in the step (2) is cooled, adding the aqueous solution prepared in the step (3) into the mixture,
stirring until the mixture is uniformly mixed to obtain the anti-caking agent.
3. The method of claim 2, wherein steps (1) - (4) do not refer to a definition of an order of operations;
the heating and stirring temperature in the step (1) is 100-120 ℃;
in the step (4), after the mixture in the step (2) is cooled to 85-95 ℃, adding the water aqua prepared in the step (3) into the mixture, and stirring until the mixture is uniformly mixed to obtain the anti-caking agent.
4. The production method according to claim 3, wherein the temperature of the heating and stirring in the step (1) is 110 ℃.
5. A method for preventing caking/surface crystallization of humic acid urea, which comprises the step of applying the anti-caking agent for humic acid urea according to claim 1 to humic acid urea.
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| CN108264412B (en) * | 2018-03-02 | 2021-06-18 | 北京尧之龙科技发展有限公司 | Special anti-caking agent for ammonium sulfate and preparation method and application thereof |
| CN108424259A (en) * | 2018-05-16 | 2018-08-21 | 芜湖市创源新材料有限公司 | A kind of preparation method for the slow-release compound fertilizer being coated with anticaking agent |
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| NZ773291A (en) * | 2018-10-02 | 2021-12-24 | Crommelin Agricoatings Pty Ltd | Composition and method for treating urea |
| CN109896894A (en) * | 2019-03-27 | 2019-06-18 | 广东博科实业有限公司 | A kind of anticaking agent and preparation method thereof for full water soluble fertilizer |
| CN110563506A (en) * | 2019-09-19 | 2019-12-13 | 湖北大学 | Preparation of anti-caking agent for fertilizer rich in rare earth elements |
| CN112044269B (en) * | 2020-08-03 | 2022-04-22 | 山东中实易通集团有限公司 | Anti-crystallization additive, preparation method and application thereof in boiler SCR denitration |
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| CN106380321B (en) * | 2016-09-06 | 2019-06-21 | 中南林业科技大学 | A kind of compound fertilizer anticaking agent and its preparation, application method |
| CN107011076A (en) * | 2017-06-09 | 2017-08-04 | 贵州大学 | A kind of fertilizer anti-caking agents and preparation method thereof |
| CN107151186A (en) * | 2017-07-12 | 2017-09-12 | 烟台市昊星晟信息技术有限公司 | A kind of method for preventing fertilizer agglomeration |
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| CN102603441A (en) * | 2012-03-15 | 2012-07-25 | 谢斌 | Swelling agent for swelling ammonium nitrate explosive |
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