CN1014013B - Slow releasing grainy pesticides - Google Patents

Abstract

A method for preparing a granular agrochemical chemical composition that slowly releases the active ingredient, consisting of the active ingredient and a carrier. These include mixing the agrochemical chemical composition granules with an isocyanate compound and fluidized paraffin to form a first covering layer consisting of isocyanate and paraffin on the surface of the granules and (or) further mixing the granules thus obtained with organic and (or) inorganic powders Mix to form an outer coat over the first coat. The invention also provides the composite structure granule and granular pesticide composition prepared by the method, which can freely adjust the release of active ingredients during use, thereby prolonging the duration of drug effect and preventing phytotoxicity.

Description

Slow releasing grainy pesticides

The invention relates to granular pesticide, more particularly is about slow releasing grainy pesticides.

On agricultural, save the labour for reaching in recent years, prevent poisoning, and, carried out the trial of the many slow property let live compositions by the purposes such as environmental pollution that agricultural chemicals causes.

The production technology of the slow release feature agricultural chemicals that was proposed in the past has multiple, roughly be divided into (1) normal-temperature reaction hardening resin and agricultural chemicals are together mixed, delay to put to dissolve and separate out (opening clear 48-5940 communique with reference to the spy): (2) are agricultural chemicals protomereization (opening clear 48-4643 communique with reference to the spy); (3), and cover micropowder (opening clear 41-19080 communique) with reference to the spy in order to prevent that being coated with full synthetic resin on gluey agricultural chemicals lumps later on; (4) make and contain solid shape lipophile matrix (opening clear 55-4356 communique) at normal temperatures with reference to the spy; (5) make appendix active component on the adsorbent (spy opens clear 56-156201 communique) or the like.

But, these slow release feature agricultural chemicals, any all have a lot of shortcomings, no matter the effect of its slow putting of promptly any situation is all insufficient, can not fully reach the slow purposes of putting such as harm that prolong residual effect, prevent the pollution of the environment and alleviate medicament, and all need a lot of additives (synthetic resin, lipophile matrix, adsorbent etc.) separately.Not necessarily practical at industrial aspect, economic aspect.

For example: (1) use as the synthetic resin of (3) or as during the solid shape oleophilic substrate of (4), separate out in order to control dissolving fully, need quite a large amount of resin or lipophile matrix, a large amount of use, separate out even can control dissolving, but very difficulty is separated out also in the free adjustment dissolving.And then, when the lip-deep additive of these granular pesticides of having been handled lacks homogeneity, then can produce pin hole, therefore, the balance that the control dissolving is separated out is destroyed, and is in industrial value very low.About (2),, will need huge expense at aspects such as equipment, production engineerings for protomereization.Therefore lack practicality.About (5), in order to make active component absorption, need a lot of adsorbents, maybe must be with the very big adsorbent of absorption affinity, but this occasion, because the result of absorption firmly, the situation that can not emit active component in water fully is a lot, is uneconomic therefore.

In view of above-mentioned present situation, the inventor has further carried out research repeatedly to the preparation technique with sufficient slow release feature, so that has finished the present invention with regard to the practicality of industrialness, economy two aspects.

Purpose of the present invention has been to provide the new slow releasing grainy pesticides of the shortcoming that solves above-mentioned prior art.

About the present invention, to put it briefly, slow releasing grainy pesticides of the present invention is to be feature to contain on the granular composition of agricultural chemicals with active component and carrier, have the cover layer that is formed by isocyanate compound and fluidisation paraffin.Simultaneously, the present invention also by isocyanates and fluidisation paraffin forms cover layer on the granular composition of active component and carrier with the slow release feature agricultural chemicals containing agricultural chemicals, again its outer cover organic dust and (or) cover layer of inorganic powder is feature.

In the present invention, owing to contain the granular composition of agricultural chemicals with active component and carrier, has aforesaid cover layer, purpose is to emit the material of active component in order to control carrier from its granular composition, simultaneously since tectal skin have organic dust and (or) cover layer of inorganic powder, can encourage above-mentioned effect.The effect of tectal isocyanate compound and fluidisation paraffin is illustrated it theoretically, is difficult, but can see in experiment, because both and usefulness have just reached effect of the present invention.

Below isocyanate compound used in the present invention, fluidisation paraffin, organic dust or inorganic powder and agricultural chemicals are illustrated with active component.

Isocyanate compound among the present invention can use isocyanate compound arbitrarily, particularly has the compound of a plurality of NCOs more effective.These compounds shown below, can be individually or two or more mixing use.

Aliphatic diisocyanate as the hexamethyl vulcabond; Between the phenyl diisocyanate in position, phenyl diisocyanate of contraposition, Toluene-2,4-diisocyanate, 6-vulcabond, Toluene-2,4-diisocyanate, 4-vulcabond, diphenyl methane-4,4 '-vulcabond, chloro phenylene-2,4-vulcabond, naphthalene-1,5-vulcabond, diphenyl-4,4 '-vulcabond, 4,4 '-vulcabond-3,3 '-dimethyl-biphenyl, 3-methyl-diphenyl methane-4,4 '-vulcabond and the such aromatic diisocyanate of diphenylether vulcabond; 1-methylcyclohexyl-2,4-vulcabond, 1-methylcyclohexyl-2,6-vulcabond, two (isocyanates the cyclohexyl)-such alicyclic diisocyanate of methane; 2,4,6-three different cyanato-toluene, the such triisocyanate of 2,4,4 '-three isocyanide oxygen yl diphenyl ethers:

With general formula

(n is the integer more than 0 and 1 in the formula)

Represented handle is by the respective mixtures of the obtained polyamide of the condensation of aniline and formaldehyde, the methylene-crosslinked poly-phenylene PIC that the phosphinylidyne chlorination generates.

Isocyanate compound in the present invention, be not limited to above-mentioned compound, but preferably aromatic isocyanate, particularly vulcabond, triisocyanate and the crude mixture that contains the methylene-crosslinked poly-phenylene PIC of multi-functional (polyfunct ional) PIC.

Fluidisation paraffin among the present invention is the aqueous saturated hydrocarbon of obtaining from oil at normal temperatures, generally is the following mixture of selling on the market of 20 carbon.

Organic dust among the present invention or inorganic powder, what can list has mineral matter micro mists such as carclazyte, talcum powder, diatomite, bentonite, calcium carbonate, magnesium carbonate, sodium chloride salt, the natural polymer of white carbon class, starch, cellulose etc., the micro mist of the synthetic or semi-synthetic macromolecule of polyvinyl alcohol, hydroxy-methyl cellulose etc. etc.The following micropowder of 100 sieve meshes particularly, even water-soluble substances, as long as when modulation, be that powder is just passable.

Agricultural chemicals active component among the present invention, there is no particular limitation.Example as representative; it can be the 5-methyl isophthalic acid; 2; 4-triazole (triazolo) (3; 4-b)-benzothiazole (tricyclazole (tricyclazole)); 1; 2; 5; 6-tetrahydrochysene-4H-pyrrolo-(3; 2; 1-ij) quinoline-4-ketone (piloquinone (Pyroquilon)); diisopropyl-1; 3-two sulfo-s alkane-2-subunit malonate (Fujione); 3-allyloxy-1; 2-benzisothiazole-1; 1-dioxide (probenazole); 2; 3-dihydro-2; 2-dimethyl benzofuran-7-base-N-methyl carbamate (carbofuran (carbofuran)); 2; 3-dihydro-2; 2-dimethyl benzofuran-7-base (two butyl amido thio)-N-methyl carbamate (kappa sulfanilamide (SN) (carbosulfan)); 2; 3-dimethyl-1; 3-benzene oxolation (benzoxol)-4-base-N-methyl carbamate 〔 Evil worm prestige (ben-dioc-arb)); 0; 0-3; 5; 6-trichloro-2-pyridyl-0; 0-dimethyl idol phosphorus thioesters (methyl Chlorpyrifos (chloropyrifos-methyl)); 2-chloro-1-(2; the 4-dichlorophenyl) vinyl-dimethyl base phosphate (2 first and second phosphorus (dimethylvinphos)); 0; 0-dimethyl-0-(3-methyl-4-(methyl mercapto) phenyl) thiophosphate (fenthion (MPP)); 1; two (carbamoyl the sulfo-)-2-(N of 3-; the N-dimethylamino) propane hydrochloride salt (Padan (Cartap)); 2; two (the ethylamino-)-6-methyl mercaptos-1 of 4-; 3,5-three azines (symetryne (Simetryn)); the own hydrogen of S-ethyl-1H-azepine -1-carbonization thioether (ordram (molinate)), 2-chloro-2 '; 6 '-diethyl-N-(fourth oxygen methyl) monoacetylaniline (Machete (butachlor)), 2-(β-naphthoxy) N-propionanilide (careless naphthalene aniline (naproanilide)), 4-(2; 4-dichloro-benzoyl base)-1,3-dimethyl-5-pyrazolyl-p-toluene fulfonate (pyrazolone (pyrazolate)), S-p-zephiran chloride diethyl thiocarbamate (benthiocarb (benthiocarb)), these active components are separately or cooperate more than two kinds to form and all can.

Use the mineral micro powder of general granular pesticide carrier.As the carrier that cooperates with above-mentioned active component, for example outer adsorptive supports such as carclazyte, talcum powder, diatomite, bentonite.

The cooperation ratio of active component and carrier is not particularly limited, and is decided by the usage amount as the active component of slow releasing grainy pesticides.The amount of active component in the weight of slow releasing grainy pesticides, is 0.05～30%, preferably 0.1～20%.

The ratio that forms tectal isocyanate compound and fluidisation paraffin is 1: 10～10: 1, preferably 1: 5～5: 1.Weight with slow releasing grainy pesticides is benchmark, and the usage amount of isocyanate compound, fluidisation paraffin is respectively 1.0～20.0 weight %, preferably 2.0～10.0 weight %.

As the usage amount of outer field organic dust or inorganic powder, be 3.0～30.0 weight %, 5.0～20.0 weight % preferably.

The usage amount of above-mentioned various materials is not one a tight proportion of composing of slow releasing grainy pesticides, but means the usage amount of various materials when it is modulated.And usage amount separately and ratio can adjust by slow the putting degree as the pesticide activity component of object, therefore, can freely control the dissolving of active component and separate out.

In agricultural chemicals of the present invention, except that above-mentioned various compositions, can add granular composition and, also can add the not agricultural chemicals active component of slow release feature skin to auxiliary agents such as outer field physical property modifying agent, stabilizing agent, colouring agent, surface-actives.

Slow releasing grainy pesticides of the present invention can adopt following manufacture method.At first, contain the granular composition of agricultural chemicals, can be listed below three kinds of methods, but be not limited to these methods with active component and carrier for obtaining.

(1) agricultural chemicals with active component, adhesive, carrier micro mist mix, pulverizing, stirring-granulating, obtain granular composition.

(2) make aqueous agricultural chemicals or solid pesticide be dissolved in solution in the nonvolatile solvent, be adsorbed onto, obtain granular composition with on oil absorption bead-type substrate or the bead-type substrate obtained by stirring-granulating.

(3) by adhesive, make agricultural chemicals cover granular composition with active component or the bead-type substrate obtained by stirring-granulating on, obtain granular composition, etc. method.

In the granular composition that contain active component obtained, add isocyanate compound and fluidisation paraffin respectively, or both are mixed by these methods.Make its covering after adding simultaneously, organic dust or inorganic powder are covered.These materials are covered equably, obtain slow releasing grainy pesticides of the present invention.

To enumerate embodiment below, reference example and test example further describe the present invention, in following embodiment and the part in the reference example and " % ", all expression " weight part " or " weight % ".

Embodiment 1

Add 30 parts of polyvinyl alcohol in 45 parts of tricyclazoles, after 925 parts of carclazytes mix, add an amount of water and stir, the comminutor of packing into is with the screen pack granulation of aperture 0.8mm.After granulation thing drying, whole grain is obtained tricyclazole and is stirred base formulation.

Secondly, get tricyclazole and stir 900 parts of base formulation.With toluylene-2,4-vulcabond and cyanate and toluylene-2,50 parts of coverings of the mixture of 6-vulcabond (ratio 8: 2) evenly cover for 50 parts with fluidisation paraffin then, obtain the granular preparation that contains tricyclazole 4%.

Embodiment 2

Add 30 parts of polyvinyl alcohol, 920 parts of carclazytes in 50 parts of tricyclazoles, the method for mutatis mutandis embodiment 1 obtains tricyclazole and stirs base formulation.

Secondly, get 800 parts of this tricyclazole base formulation, add 50 parts in 50 parts of the crude mixture of methylene-crosslinked poly-phenylene PIC and fluidisation paraffin simultaneously, after covering equably, adding covers equably as 100 parts in outer field diatomite, obtains the granular preparation that contains tricyclazole 4%.

Methylene-crosslinked poly-phenylene PIC

（n＝1～8）

(methylene is 0 to the position of different cyanato-

-, m-, P-position)

Embodiment 3

Get 775 parts of 16 orders and 32 purpose granular calcium carbonates, 50 parts of piloquinones with 25 parts of mixing of polyethylene glycol (molecular weight about 400), are covered then, obtain the granular composition that contains piloquinone.

Then add 2,4,30 parts of 6-three different cyanato-toluene cover the back and add 30 parts in fluidisation paraffin, make its even covering.Further cover 90 parts of talcum powder equably as skin, obtain the granular preparation that contains piloquinone 5%.

Embodiment 4

In 73.5 parts of kappa sulfanilamide (SN), add 20 parts of polyvinyl alcohol, 100 parts of bentonites, 806.5 parts of carclazytes, the method for mutatis mutandis embodiment 1 obtains the stirring base formulation that contains kappa sulfanilamide (SN).

Then, card taking crust sulfanilamide (SN) stirs 680 parts of base formulation, cover 60 parts in fluidisation paraffin after, cover equably again diphenyl-4,4 '-60 parts of vulcabond, further cover 200 parts of carclazytes equably as outer, obtain the granular preparation that contains kappa sulfanilamide (SN) 5%.

Embodiment 5

Take the tricyclazole that embodiment 1 obtains and stir 900 parts of base formulation, cover employed diphenyl-4,4 among the embodiment 4 '-40 parts in the mixture (1: 1) of vulcabond and fluidisation paraffin.Then cover 10 parts of white carbon blacks equably, make 50 parts in its absorption propyl benzene phosphorus (propaphos) (0,0-dipropyl-0-4-methyl thio-phenyl phosphate) then, obtain the granular preparation that contains tricyclazole 4% and propyl group phosphate 5%.

Embodiment 6

In 68 parts of 55 parts of tricyclazoles, kappa sulfanilamide (SN), add 10 parts of sodium carboxymethylcelluloses, 300 parts of bentonites, 567 parts in talcum, the method for mutatis mutandis embodiment 1 obtains and contains tricyclazole and kappa sulfanilamide (SN) stirs base formulation.

Then, get this and stir 730 parts of base formulation, 80 parts of the crude mixture of the methylene-crosslinked poly-phenylene PIC that uses in embodiment 2 and 40 parts of addings simultaneously of fluidisation paraffin are covered.Cover 150 parts in calcium carbonate again, obtain the granular preparation that contains tricyclazole 4% and kappa sulfanilamide (SN) 5%.

Embodiment 7

In ordram 91, add 10 parts of polyvinyl alcohol, 200 parts of bentonites, 699 parts of carclazytes, the method for mutatis mutandis embodiment 1 obtains ordram and stirs base formulation.

Get ordram and stir 880 parts of base formulation, add while the mixed liquors of 20 parts of 100 parts in fluidisation paraffin and tetramethylene pentaphene base five isocyanates are stirred, covering obtains the granular preparation that contains ordram 8% equably.

Embodiment 8

100 parts in diatomite, 300 parts of bentonites, 600 parts of mixing of calcium carbonate with the prilling process of embodiment 1, obtain the granular blank base formulation that does not contain active component.Get 760 parts of this blank base formulation, make after its 40 parts of Machete of absorption, cover 70 parts in sulfuration paraffin.Then, cover 30 parts of diphenyl-4,4-vulcabond after, cover 100 parts of starch dusts more equably, obtain the granular preparation that contains 4% Machete.

Embodiment 9

Get 840 parts of the blank base formulation of embodiment 8, make its absorption be dissolved in solution in 70 parts of the benthiocarbs to 15 parts of symetrynes.This is covered 45 parts in sulfuration paraffin.Then cover 30 parts of tetramethylene pentaphene base five isocyanates equably, obtain the granular preparation that contains symetryne 1.5% and benthiocarb 7%.

Reference example 1

After 40 parts of tricyclazoles and 600 parts of mixing of carclazyte, it is that the heating of 150 parts of 58 ℃ 210 parts of solid paraffins and stearic acid (58～59 ℃ of melting points) dissolves in the mixed liquor that this mixture is added melting point inchmeal, mixes.This mixture is heated to 80 ℃, behind the formation suspension,, obtains the granular preparation that contains tricyclazole 4% with the air prilling of air prilling device.

Reference example 2

Take tricyclazole stirring base formulation (the containing tricyclazole 4.5%) 900 parts that embodiment 1 obtains, cover toluylene-2 equably, 4-vulcabond and toluylene-2,100 parts of 6-mixtures of diisocyanates are obtained the granular preparation that contains tricyclazole 4%.

Reference example 3

The mixed active charcoal is 300 parts in 40 parts of tricyclazoles, 30 parts of polyvinyl alcohol, and 630 parts of carclazytes, with the prilling process of embodiment 1, granulating and drying is obtained the granular preparation that contains 4% tricyclazole.

Reference example 4

Take 850 parts of the granular constituents that contains piloquinone 5.9% that embodiment 3 obtains, cover 60 parts in fluidisation paraffin, cover 90 parts of talcum powder then, obtain the granular preparation that contains piloquinone 5%.

Reference example 5

Get the kappa sulfanilamide (SN) that embodiment 4 obtains and stir 680 parts of base formulation, add diphenyl-4,4 '-mixtures of 240 parts of vulcabond and 20 parts of mixing of following propylene polyalcohol cover equably, obtain the granular preparation that contains kappa sulfanilamide (SN) 5%.

The propylene polyalcohol is

Use general expression:

（n＝5～8）

Represented compound and

Use general expression:

（m＝3～6）

(mean molecule quantity is (2000～4600) to the polymer of represented compound

Reference example 6

Get the resulting tricyclazole of embodiment 1 and stir 900 parts of base formulation, add the mixed solution of 50 parts of 50 parts in fluidisation paraffin and propyl group phosphate, allow its absorption, covering, obtain the granular preparation that contains tricyclazole 4% and propyl group phosphate 5%.

Reference example 7

Get embodiment 6 resulting tricyclazoles and kappa sulfanilamide (SN) and stir 730 parts of base formulation, 120 parts of the crude mixture of covering embodiment 2 employed methylene-crosslinked poly-phenylene PICs, cover 150 parts in calcium carbonate more equably, obtain the granular preparation that contains 4% tricyclazole and kappa sulfanilamide (SN) 5%.

Reference example 8

Get embodiment 7 resulting ordrams and stir 880 parts of base formulation, add 30 parts in fluidisation paraffin, epoxide (GAN : Japanese chemical drug (strain) system) 60 parts, polyamide-based compound (REACT CA-101 : Sanyo changes into (strain) system) 30 parts cover equably, obtain the granular preparation that contains ordram 8%.

Reference example 9

Get 760 parts of the blank base formulation that embodiment 8 obtains, add 40 parts of Machetes, epoxide (GOT : Japanese chemical drug (strain) system) 70 parts, polyamide-based curing agent (REACT CA-101 : the solution of (Sanyo changes into (strain) system) 30 parts of mixing is adsorbed on the blank base formulation it.After the absorption, cover 100 parts of starch dusts equably, obtain the granular preparation that contains Machete 4%.

Reference example 10

Get 915 parts of the blank base formulation that embodiment 8 obtains, make the solution absorbs of in 70 parts of benthiocarbs, having dissolved 15 parts of symetrynes on base formulation, obtain the granular preparation that contains symetryne 1.5% and benthiocarb 7%.

The granular preparation that the foregoing description 1～9 and reference example 1～10 are modulated has carried out following test.

Test example 1: the dissolving property separated out test in the water

Tested dissolving the separating out property of composition in water by the various granular preparations of embodiment and reference example manufacturing.Test method is as follows:

Prepare the beaker of 3l,, in 20 ℃ thermostatic chamber, left standstill one to wherein adding 3 degree hard water 900ml.Become the granular preparation 90mg of score value to spread to equably in this beaker having measured in advance.

Behind the spreading 1,10,30,60 days and 100 days,, carry out quantitative analysis with gas chromatography or high speed liquid phase chromatography by centre in the beaker (depth of water 1cm) water intaking.

The dissolving eduction rate is the amount (μ g) of contained various compositions in the granular preparation of the amount (μ g) of the dissolving various compositions of separating out from water and spreading, tries to achieve by following formula.The results are shown in table 1 li.

Dissolving eduction rate (%) in water=(the one-tenth component (μ g) that dissolving is separated out in the water)/(contained one-tenth deal (μ g) in the granular preparation of spreading) * 100

The sizing technique of various compositions, about kappa sulfanilamide (SN), propyl group phosphate, ordram, Machete benthiocarb, symetryne gas chromatography, tricyclazole, piloquinone carry out with the high speed Liquid Chromatography.

Test example 2 rice blast control test

Use the granular preparation of embodiment 1,2,3,5,6 and reference example 1,2,3,4,6,7, observe rice blast control efficiency and poisoning.

Below represent test method:

(1) grows seedlings

(30 * 60 * 3cm) the 25 leaf phase rice (kind: like to know the rising sun) that bring out are for experiment in seedling growing box.

(2) chemicals treatment

Transplanting the previous day, the various test granular preparations of the every case 100g of dispensing, after the processing, every case 500ml that pours water.

(3) cultivation of rice

After the chemicals treatment 1 day, from rice seedling, every strain 5 stems are implanted container (TS-36,54 * 36 * 15cm) interior 4 strains with trans-planter separate.Planting density is by each container 4 strain, quite plant about 20,000 strains/10 ares of nursery.

(3) calibrating of rice blast control efficiency

Container is moved in the seedbed, greenhouse that excites rice blast, make its natural infection, to transplanting back the 10th day (poisoning), transplanting back (leaf seasonal febrile diseases) on the 55th and transplanting back the 100th day (tassel blast) and investigate, calibrating control efficiency and poisoning.But the investigation of leaf seasonal febrile diseases will prevent that phytopathy from giving by Japan and examine the investigation benchmark, carries out with every strain lesion area rate.Tassel blast is calculated degree of catching an illness (%) by following formula.

The evaluation of poisoning is undertaken by following standard.

-: perfect leaf (no poisoning)

+: about 20～80% degree to leaf is confirmed poisoning.

++: about 30% above degree to leaf is confirmed poisoning.

Table 2 ecbatic.

The 3 insecticidal power residual effect tests of test example

(with rice water weevil (rice water weevil( Lissrhoptrus OryzophilusK.)) larva test residual effect)

Use embodiment 4,6, the granular preparation of reference example 5,7 is carried out the test of insecticidal power residual effect with rice water weevil larva.

Below represent test method.

Grow seedlings, chemicals treatment, with the test example 2 method carry out.After the chemicals treatment 1 day, the rice seedling of 1 strain, 5 stems is migrated in 1/5000th ares the little basin of Wagner (wagnerpot).After the transplanting, canoe is kept in the nursery of setting up on the roof, and the depth of water keeps 3cm.The inoculation of larva is to give earlier allowing adult lay eggs in the container in the greenhouse, plants rice seedling and uses the larva of raising while mend.Put in each ship and raise 10 larvas.After larva inoculated for 1 week, the rice root is washed, check the larva number.Its result represents with table 3.

The 20th day data for example in the table are to have investigated inoculation larva on the 20th after the chemicals treatment, one week the back larva quantity.

The test of test example 4 herbicidal effects

With the granular preparation of embodiment 7,8,9 and reference example 8,9,10, carry out the herbicidal effect test.Test method is following to be shown.

With the little basin of 1/5000th ares Wagners, after digging in the rice seedling field, in each ship, sow barnyard grass ( Panicum Crus-galliL.) 30 and Vandellia ( Lindernia PyxidariaL.), yew is careless belongs to ( Rotala indica Koehne var.uliginosaMiquel), Monochoria ( Monochoria vaginalisPresl) seed mixture, blinding 5mm.After planting the 8th day suitable 3Kg/10 are of spreading dose of weeds for examination shape preparation, to after the chemicals treatment 10 days, the barnyard grass after 20,30 days and 40 days, Vandellia, the remaining quantity that the yew grass belongs to, the rain flowers and plants belong to were investigated.Depth of water during chemicals treatment is about 3cm, pours water later on, makes the depth of water keep 3cm.Its result is as shown in table 4.

In above test, can obviously find out slow releasing grainy pesticides of the present invention, compared with former known slow releasing grainy preparation, the slow effect of putting is extremely excellent, to the prolongation of duration of avoiding poisoning and drug effect etc., also is the product that remarkable purposes is arranged biologically.

From above explanation, obviously find out slow releasing grainy pesticides of the present invention, owing to also use as cover layer with isocyanate compound and fluidisation paraffin, they cover mutually and replenish mutually, compare when using separately with them, not only can prevent the inhomogeneities that covers and the formation of micropore, and consumption is few, can obtains the slow significantly effect of putting.

Be also usefulness again owing to organic dust and inorganic powder, the also usefulness of aforementioned two kinds of compounds, a small amount of micropore of existence has not only further been improved to delay and has put effect, and can reduce usage amount separately owing to the powder filling effect eliminates.

According to the present invention, owing to adjust the consumption of employed additive, and can freely control the slow effect of putting.Before can fully obtaining technology can not getable biological effect the slow release feature of (prolongation of residual effect, prevent poisoning).After isocyanate compound and fluidisation paraffin covered owing to use the oil absorption micropowder of powder, for example white carbon black, diatomite etc., further by other agricultural chemicals of absorption with active component or adhesive.And it is covered, and obtain preserving the granular pesticide of active component with the sandwich construction carrier, most active components are emitted with different speed.

The additive that the present invention uses can be obtained effect of sufficient with less amount, in manufacturing process, also there is no need with special operation, and be practical in economy, industrial aspect.

Slow releasing grainy pesticides of the present invention described above, have former sustained preparations unavailable outstanding feature. Summarize these features, as following some:

1, slow releasing grainy pesticides of the present invention because can the free adjustment active component emit, so the duration of drug effect has prolonged significantly. The way that in the past will carry out repeatedly the spreading processing is become can corresponding spreading number of times still less. Have again, the nursery box of the rice cropping state that particularly in recent years is widely used, the medicament that originally should after rice transplanting, be dispensed onto the field, can be at the stage high density spreading of growing seedlings (because little, the spreading of area is processed very light) etc., laborsaving effect is fine.

2, on the other hand, when once having the dissolving of high concentration to separate out, expression also can often be controlled at the low concentration of fully obtaining the drug effect scope to the active component of plant illeffects, and one time spreading is processed, and continues for a long time drug effect, can avoid poisoning. Because once the high concentration medicament is not separated out in dissolving, so safer to fishing shellfish wildlife yet.

Claims (7)

1. A method for preparing a slow-release granular pesticide composition, which includes preparing a granular composition, in which, based on the weight of the slow-release granular agricultural chemical composition, 0.05-30.0% (by weight) of Pesticide active ingredient and 60.0-95.0% (weight) carrier, add 1.0-20.0% (weight) of isocyanate compound and 1.0-20.0% (weight) of fluidized paraffin to this composition alone or simultaneously, the ratio here Also based on the weight of the slow-release agrochemical composition, and the mixing ratio of the isocyanate compound and the fluidized paraffin is 1:10-10:1 by weight to form a coating on the surface of the granular composition. 2. The method for preparing the slow-release powdery pesticide composition according to claim 1, wherein the particles forming the covering layer are mixed with 3.0-30.0% (by weight) of organic powder and (or) inorganic powder, wherein The ratio is based on the weight of the pesticide chemical composition, so that an outer coating layer is formed on said coating layer. 3. The preparation method of the slow-release granular pesticide composition according to claim 2, wherein the inorganic powder is selected from mineral powders, such as clay, talcum powder, diatoms, bentonite; salts, such as calcium carbonate, magnesium carbonate , sodium chloride; and white carbon, while the organic powder is selected from natural macromolecules, such as starch, cellulose, and synthetic or semi-synthetic macromolecules, such as polyvinyl alcohol, carboxymethyl cellulose. 4. The method for preparing the slow-release granular pesticide composition according to claim 1, wherein the mixing ratio of the isocyanate compound to the fluidized paraffin is 1:5-5:1 by weight. 5. The method for preparing the slow-release granular pesticide composition according to claim 1, wherein the amount of the isocyanate compound is 2.0-10.0% by weight based on the weight of the slow-release granular pesticide composition. 6. The method for preparing the slow-release granular agricultural chemical composition according to claim 1, wherein the amount of fluidized paraffin is 2.0-10.0% by weight based on the weight of the slow-release granular agricultural chemical composition. 7. The method for preparing the slow-release granular pesticide composition according to claim 2, wherein the amount of organic powder and (or) inorganic powder is 5.0-20.0% ( weight).