JPS6117486A - Solidification preventing agent for fertilizer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is applicable to caking fertilizers such as urea, ammonium sulfate, ammonium nitrate, ammonium phosphate, ammonium chloride, potassium chloride, advanced chemical fertilizers, and compound fertilizers thereof. Regarding anti-caking agents such as.

[Conventional technology]

Chemicals used as fertilizers have the disadvantage of caking during storage, making workability difficult.

For this reason, various measures to prevent caking have been studied and many proposals have been made, which can be broadly classified into those under AI.

(!) A method of mixing insoluble fine powders such as diatomaceous earth, Merck, kaolin, silicic acid powder, and fatty acid calcium salts with a caking substance to prevent direct contact with the caking substance.

(2) Coating the surface of the caking substance with mineral oil, water-soluble polymer, etc. to form a waterproof skin 1a, blocking moisture ingress and egress, and preventing the formation of interparticle O bridging crystals. Method.

(3) A method of spraying aliphatic amines, aliphatic diamines, and their salts to form a monomolecular film on the surface of a caking substance, thereby changing the properties of the surface of the caking substance and making it difficult to caking.

(4) A method of preventing caking by changing the crystalline state of urea using a complex of a polymer and an anionic surfactant or using a crystal modification action such as magenta acid for ammonium sulfate.

[Problem that the invention seeks to solve]

However, the above method is not necessarily satisfactory. In other words, (11, (21) may not provide sufficient anti-caking effect even if added in a few percent)
, (3t) (Method 41 applies only to a limited number of caking fertilizers. In particular, method (3) has difficulty in uniformly converting solid aliphatic amines into fertilizers, and at the same time Difficult to use due to amine odor and skin irritation.

[Means for solving problems]

Therefore, the present inventors conducted intensive research to obtain an excellent anti-caking agent free from the above-mentioned drawbacks using various woodcutter caking fertilizers, and as a result, the present invention was completed.

That is, the present invention provides an anti-caking agent for fertilizers containing a reaction product of an alkenyl (or alkyl) succinic anhydride and an aliphatic amine as an essential component.

The fulkenyl group (or alkyl group) of the alkenyl (or alkyl)succinic anhydride according to the present invention has 4 to 26 carbon atoms.
It is preferable to have a straight chain or a branched chain.

The aliphatic amine according to the present invention may be a primary amine, a secondary amine, or a tertiary amine. Primary amines include linear or branched alkyl having 4 to 26 carbon atoms (
or alkenyl) amines. Specifically I-i
Among them are tylaquine, 2-ethylhexylamine, laurylamine, stearylamine, oleylamine, isostearylamine, and the like. Examples of the secondary amine include dialkyl (or dialkenyl) amines having a linear or branched alkyl (or alkenyl) group having 4 to 26 carbon atoms. Specific examples include dioleylamine, dilaurylamine, distearylamine, and the like. Examples of tertiary amines include trialkyl (or alkenyl) amines and dialkyl (or alkenyl) amines having i:st or branched alkyl (or alkenyl) groups having 4 to 26 carbon atoms.
Examples include methylamine and alkyl (also alkenyl) dimethylamine. Specific examples include trioctylamine, dilaurylmethylamine, and stearyldimethylamine.

The reaction molar ratio of alkenyl (or alkyl)conophosphate anhydride and aliphatic amine is 10/1 to 1/10, preferably 571 to 115.

The reaction conditions are arbitrarily selected depending on the starting materials, but the reaction temperature is usually OC~200tr, preferably 50~100C.
It is. However, if the aliphatic amine is a tertiary amine, 8
0 to 150C is preferred.

The reaction time is appropriately selected depending on the amount charged and the reaction temperature. Usually, it is 1 to 10 hours.

The reaction is usually carried out by adding the aliphatic amine dropwise to the alkenyl (or alkyl)succinic anhydride while stirring, but the reverse may be used or the aliphatic amine may be added dropwise at the same time. It is preferable to replace the reaction system with an inert gas such as nitrogen.

If necessary, a solvent such as benzene, toluene, isopropyl ether, etc. may be used.

The reaction product according to the present invention is considered to be a mixture of various compounds, but the main component is a ring-opened amidation product of alkenyl (or alkyl)cono-phosphate anhydride, its amine salt, and quaternary ammonium salt (in the molecule). It is considered that these results show the remarkable effects of the present invention.

The fertilizer targeted by the anti-caking agent of the present invention is not particularly limited, and any of urea, ammonium sulfate, ammonium nitrate, potassium chloride, ammonium phosphorous, advanced chemical fertilizers, or compound fertilizers containing these properly blended are excellent. You can get the same effect.

The anti-caking agent of the present invention can be sprayed onto fertilizers as is or diluted with machine oil or the like.

The treatment amount of the reaction product of the present invention is JO05-2 for fertilizer.
The weight ratio is preferably 0.05 to 0.5%.

〔Effect of the invention〕

Conventional aliphatic amines have a strong pungent odor, so
In addition, since it is a solid amine, there were various problems such as dilution, but since the compound of the present invention is a reaction product of alkenyl (or alkyl) cono-phosphate anhydride and aliphatic amine, it has no irritating odor. Toxicity is also significantly improved, and at the same time,
The solution is liquid and suitable for spray treatment. If inorganic materials such as clay, talc, and clay are used in combination with the powder, even better anti-caking properties will be exhibited.

By using the anti-caking agent of the present invention, it is possible to obtain an excellent anti-caking effect even for fertilizers with large particle sizes, for which conventionally it was difficult to obtain an anti-caking effect.

〔Example〕

The present invention will be explained below with reference to Examples, but the present invention is not limited to these Examples.

Synthesis Example Dodecenylsuccinic anhydride 26611 (1 mol) was placed in a nozzle flask equipped with a stirrer, thermometer, nitrogen inlet tube, reflux condenser, and dropping funnel, and octylamine 129P (1 mol) was added while keeping the temperature at botz. It took 30 minutes for the subordinate to arrive. After the dropwise addition was completed, the temperature was raised to aOC and stirred at the same temperature for 3 hours to complete the reaction.

Example 1 Large grains of urea (manufactured by Mitsui Toatsu Co., Ltd., diameter 3.5 m) as fertilizer
), sprayed with 0.1% of the anti-caking agent shown in Table 1, and placed 459 in a cylindrical hard PVC mold with an inner diameter of 4 crn
After filling and pressurizing 2/cri2, 3011;'8
After being left at 0% relative humidity for 14 days, the breaking strength was determined using a Tensilon compressive strength meter, and the caking prevention rate was determined using the following formula. The results are shown in Table 1.

As is clear from Table 1, the anti-caking agent of the present invention (A + ~
No. 15) showed superior caking prevention effect compared to comparative products (Ya 16 to 19) K.

× 100 Example 2 Advanced chemical fertilizer (N-P-, 15-1s-1
5) was used to spray 0.1% of the anti-caking agent shown in Table 2, and 451
1 and 2 kg/err? After pressurization, 30C8
After being left at 0% relative humidity for 14 days, it was taken out, the breaking strength was determined using a Tensilon compressive strength meter, and the caking prevention rate was determined according to both formulas. The results are shown in Table 2.

As is clear from Table 2, the products of the present invention (A20-28) exhibited superior caking prevention effects compared to the comparative products (A29-35).

Example 5 Potassium chloride was used as fertilizer and the anti-caking agent shown in Table 3 was added at 0.00%.
3% spray treatment, 45.9 was filled into a cylindrical hard PVC mold with an inner diameter of 4 an, and after pressurizing 2 kP/d, 30C80
% relative humidity for 14 days, the breaking strength was determined using a Tensilon compressive strength meter, and the caking prevention rate was determined according to both formulas. The results are shown in Table 3.

As is clear from Table 3, the products of the present invention (A36-44) exhibited superior caking prevention effects compared to the comparative products (A45-51).

Claims (1)

[Claims] 1. An anti-caking agent for fertilizers containing a reaction product of alkenyl (or alkyl) succinic anhydride and aliphatic amine as an essential component. 2. The reaction blending ratio (molar ratio) of alkenyl (or alkyl) succinic anhydride and aliphatic amine is 10/1 to 1/
10. The anti-caking agent for fertilizer according to claim 1.