CN1034203C

CN1034203C - Prodn. of pesticide for use in rice field-membrane form

Info

Publication number: CN1034203C
Application number: CN88105763A
Authority: CN
Inventors: 粟贵武
Original assignee: Individual
Current assignee: Individual
Priority date: 1988-08-18
Filing date: 1988-08-18
Publication date: 1997-03-12
Anticipated expiration: 2003-08-18
Also published as: CN1040303A

Abstract

The present invention relates to a film agent which is prepared from active components, a solvent for dissolving active components, an extending agent and a surface active agent. The film agent is transparent homogeneous liquid which is not emulsified or dissolved and is rapidly spread into a film on the water surface, the specific gravity of the film agent is small than 1, and the surface tension is from 22 dynes/mm to 33 dynes/mm(25 DEG C); the interfacial tension of the film agent to water is smaller than the surface tension of water minus the surface tension of the film agent, and the extension distance of the film agent on the water surface can reach 450cm. The film agent has the advantages of strong pertinence, low cost, high horsepower, all-day medicine application, enduring medicinal effect, reduced environmental pollution, simple and convenient processing, easy use, and the like., and is suitable for being processed into various agricultural chemicals used in paddy fields.

Description

Prodn. of pesticide for use in rice field-membrane form

The present invention relates to the processing novel form of the agricultural chemicals of a kind of rice field use.

The formulations of pesticide are various both at home and abroad at present, but can reduce three classes, one class is used formulation for spraying, as missible oil, wetting powder, colloidal suspending agent, pulvis and ultra low volume spray agent etc., two classes are used formulation for spreading fertilizer over the fields, and as bulky grain agent, granule agent etc., three classes are aerosol, utilization is fuming principle with agricultural chemicals dispersion arrival target, is mainly used in habitats such as greenhouse, warehouse.After wherein missible oil, colloidal suspending agent, wetting powder need to be emulsion with big water gaging dilution earlier, can agricultural chemicals be distributed on the protected crop with the common sprayer tool, spraying the medicine volume is the 600kg-2250kg/ hectare, this kind insecticide-applying way not only labour intensity is big, work efficiency is low, and rainy day or dispenser in good time in rainy season reduce the control effect to disease, worm, grass; The ultra low volume spray finish, though do not want thin up, can directly spray, and spray medicine volume is little, be generally the 1500-3750ml/ hectare, but need special ultra-low-volume sprayer, and rainy day, calm day or wind-force all can not implement spraying at the weather more than 3 grades, be subjected to the more common spraying of weather condition restriction also big; Granule can directly spread fertilizer over the fields in the paddy field, need not special equipment, is subjected to the restriction of weather conditions less, and the rainy day also can spread fertilizer over the fields.But the granule difficulty of processing is bigger, and cost is also higher, spreads fertilizer over the fields to be difficult for evenly, and consumption is the 15kg-30kg/ hectare.

The herbicides for use in paddy technology of the disclosed clear 56-26641 of Japan's special permission communique is a kind of missible oil processing formulation, and it is dilute with water not, can expand at the water surface, and slowly sedimentation is then infiltrated in the paddy field soil, with the control weeds; The disclosed a kind of herbicides for use in paddy of CN86106679 patent application also needn't need not special equipment, but still belong to a kind of suspending agent with big water gaging dilution when applying.The missible oil of the above-mentioned type and suspending agent, can drip or spill and impose on the water surface, and can expand at the water surface, and initial extension speed is also very fast, but in expansion emulsification and sedimentation take place simultaneously, make the expansion rate gradual slow, diffusion length is little, cause agricultural chemicals to be bigger concentration gradient simultaneously and distribute, medicament distributes even inadequately.

The present invention is intended to explore a kind of new pesticide processing formulation, not only needn't dilute with water, need not special equipment, and not emulsification in water, do not dissolve, active ingredient is evenly distributed, the high effect that diffusion length is big, lowly pollute, film easy to use.

The technical scheme that realizes above-mentioned task is as follows: film is the solvent by active component, lytic activity composition, four kinds of components of spreading agent and surfactant are formed, this film is a kind of transparent homogeneous phase liquid, not emulsification in water is not dissolved, and sprawls into film at the water surface rapidly, the proportion of this film is less than 1, surface tension is 22-33 dynes per centimeter (25 ℃), the surface tension of the interfacial tension＜water of film/water-film surface tension, and the extended range on the water surface can reach 450cm.The active component that film of the present invention is selected for use should have certain solvability in solvent, desinsection, and the active component of sterilization class should have interior absorption or strong permeability to water plants such as paddy rice; The organic solvent that is elected to be solvent is beneficial to outside lytic activity composition and the surfactant except having certain polarity, and surface tension should be less than 35 dynes per centimeter; Spreading agent also should have stronger polarity, helps to reduce film/water termination tension force, is beneficial to film and sprawls at the water surface.Boiling point higher (b, p＞100 ℃), surface tension is less than 32 dynes per centimeter; Surfactant is that HLB (hydrophilic lipophilic balance) is that 1～18 A, N, C type all can.

Every have all kinds of agricultural chemicals of certain solubility all can be processed into film of the present invention in organic solvent, and water plants such as desinsection wherein, bactericide reply paddy rice have interior absorption or inhale permeability.

Technical scheme of the present invention is the surface tension＞film surface tension+film/water termination tension force that makes water, and film can be sprawled into film rapidly on the water surface like this.How many active component contents in the film depends on efficient (effective ingredient consumption/unit are) and the solvability of active component, and solvability is big, and active component content can suitably improve, and the consumption of corresponding film can reduce.Spreading agent except surface tension less than 33 dynes per centimeter, its boiling point is greater than 100 ℃, when using medicament like this under hot conditions, solvent evaporates is slow, is beneficial to the even expansion of film, largest extension apart from the time, active component still can effectively play a role.The film of some kind, its spreading agent can be selected same kind of organic solvent (seeing embodiment one) for use with the solvent of dissolving active ingredient.As the HLB of surfactant during at 1-4, its consumption can be chosen in 12%, but when HLB 8 when above, content range can be chosen in 1%, such content selects to make the film can be not automatic emulsified at the water surface, and active component, solvent, spreading agent and surfactant be the mixing of two or more type all.

Various types of pesticide for use in rice field are processed into film of the present invention following characteristics are arranged:

1, with strong points: the medicament water surface that evenly distributes, absorb by leaf sheath, rice fulgorid, banded sclerotial blight and underwater weeds to harm leaf sheath position, can fine performance drug effect, and it is less to the non-target biotic influence more than the water surface, can reduce like this killing and wounding of natural enemy, be beneficial to system's control action of performance natural enemy.

2, cost is low, the effect height: adopt the such processing formulation of film, various paddy pesticide consumptions are about about the 3000ml/ hectare, and are close with the dosage and the effect of ultra low volume spray, but need not the ultra low volume spray apparatus, thereby cost is low.

3, round-the-clock dispenser: spray or dust and can not carry out in the rainy day, ultra low volume spray can not carry out under rainy day, strong wind or calm condition, but the use of film can not be subjected to the restriction of weather condition.

4, lasting medicine: because agricultural chemicals is dissolved in the organic solvent, reduce contacting the decomposition that causes with water, medicament is distributed in the water surface and following, reduces photolysis, and the two all is beneficial to the prolongation of drug effect.

5, reduce environmental pollution: medicament imposes on the water surface, reduces the pollution to the plant upper space, reduces the residual quantity of agricultural chemicals in crops such as paddy.

6, processing is easy: do not need complicated process equipment, and easy and simple to handle.

7, use conveniently: do not need any spraying device, do not need dilute with water yet, drip extensively, spill, spread fertilizer over the fields on the water surface, can be on the water surface automatic expansion reach the even distribution of the full water surface.

With embodiment this film is further elaborated below.

The weeding test of embodiment 3 benthiocarb films

Prescription is formed: benthiocarb 150g

Toluene 150g

Oleic acid 25g

This spot 85 5g

Dispenser period: impose on 1.5 mu of seed farms transplanting 6 days morning July 11

For trying the water rice varieties: 85R2,9024, samsara 422

Insecticide-applying way: mix 30 jin of urea, hand spreads fertilizer over the fields

Water depth: 5-6cm

Poisoning: do not find poisoning after the dispenser in 5 days

Drug effect: check 5 of the artificial barnyard grass that has germinateed the grass points that is provided with, the barnyard grass bud is all dead.Embodiment one:

The component of all kinds of films and content Embodiment two:

The composition of all kinds of films and proterties

★ extended range assay method: in the rice field of long 1250cm, wide 300cm, put the dark water layer of 5-7cm, spread the polyester form fractionlet in the center, rice field, and at distance fragment 1cm place, high 5cm place drips 1 test solution, puts down in writing fragment largest extension distance and used time then.

Claims

1, a kind of processing formulation---film of pesticide for use in rice field, it is characterized in that: this film is that a kind of proportion is less than 1, surface tension is 22-33 dynes per centimeter (25 ℃), the interfacial tension of the film/water (surface tension of water-film surface tension, extended range can reach the transparency liquid of 450cm on the water surface, it is by active component, solvent, four kinds of components of spreading agent and surfactant are formed, active component is the weed killer herbicide benthiocarb that certain solubility is arranged in solvent, the bactericide mebenil, tricyclazole, the insecticide basudin, acephatemet, its content in film is 1-40%, spreading agent is boiling point higher (b.p/100 a ℃), surface tension＜32 dynes per centimeter, the organic solvent oleic acid that polarity is strong, butyl ether, its content in film is 0.5-10%, surfactant is that HLB is the A of 1-18, N, the C type all can, Tween 80, this spot 85, content≤1% of the surfactant of HLB＞8 in film, content≤12% of the surfactant of HLB1-4 in film, solvent is surface tension＜35 dynes per centimeter, can the lytic activity composition and the organic solvent kerosene of surfactant, n-butanol, toluene, cyclohexanone, butyl ether.