CN1513332A - Microcapsule green pesticide preparation and preparation method thereof - Google Patents

Abstract

The invention discloses a microcapsule green pesticide preparation and a preparation method thereof, the microcapsule green pesticide preparation consists of a capsule core and a capsule skin, and is characterized in that the capsule skin comprises a composition of two or more than two hydrolyzates of animal glue, vegetable glue and marine product glue; the preparation method comprises the following steps; preparing the original pesticide into liquid by using a solvent, adding an auxiliary agent, vegetable oil and a surfactant, and then adding the solvent for dilution to prepare a capsule core; the microcapsule green pesticide preparation is prepared through hydrolyzing animal glue, plant glue and marine glue, filtering, mixing, stirring, mixing in a reactor with capsule core at 200-600 rpm, cooling naturally for 2 hr and packing.

Description

A kind of microcapsule green pesticide preparation and preparation method thereof

(1) Technical field:

The invention relates to the technical field of pesticide formulations, in particular to a microcapsule green pesticide preparation and a preparation method thereof.

(two) background technology:

Due to the harm of diseases, insects and weeds, the annual loss of crops in the world is about 1/3. In order to control and reduce the harm of diseases, insects and weeds, the world uses up to 3 million tons of pesticides every year, most of which are Chemical pesticides. Although chemical pesticides have made great contributions to agriculture, their toxicity is high, and there are many pesticide residues in plants, and they will penetrate into the soil, rivers or groundwater, affecting people's health, reducing soil quality, causing Environmental pollution, so water-based pesticide formulations are the direction of pesticide development; in addition, some chemical pesticides themselves have the characteristics of light decomposition, instability to water, special odor, strong corrosion, etc., and the direct use effect is not ideal , or even unusable; with the continuous enhancement of people's awareness of safety, environment, and ecological sustainable development, microcapsule preparations have received people's attention, and it can overcome the above-mentioned defects, but the capsule skin of the usual microcapsule preparation generally adopts high Molecular polymers, most of which are synthetic polymers, such as polyamides, polyurethanes, and urea-aldehyde resins, because synthetic polymers are difficult to biodegrade, there are still some organic substances remaining in plants On the leaves, it has adverse effects on the environment and humans and animals, and some even have certain carcinogenicity; in addition, its processing technology is complicated, and the additives added are complicated.

(3) Contents of the invention:

The object of the present invention aims at overcoming the above-mentioned deficiencies in the prior art, and provides a kind of microcapsule green pesticide preparation that a kind of capsule skin is made up of natural macromolecular polymer namely edible protein completely.

Another object of the present invention is to provide a preparation method of microcapsule green pesticide preparation.

The present invention mainly solves the problem that the capsule skin of the existing microcapsule preparation cannot be biodegraded and remains on the leaves of plants, which causes environmental pollution and the decomposition of the pesticide itself when exposed to light, is unstable to water, has special peculiar smell, and is highly corrosive. Problems with being unusable for spray application.

A kind of microcapsule green pesticide preparation of the present invention can completely biodegrade in the air because its capsule skin is completely made up of natural high molecular polymers, has no pollution to the plant itself and the environment, is absolutely safe and harmless, and replaces the solvent with water at the same time, Making it a real green pesticide.

In order to achieve the above object, the present invention is achieved in this way: a microcapsule green pesticide preparation is composed of a capsule core and a capsule skin, and its special feature is that the capsule skin includes two kinds of animal glue, plant glue, seafood glue and Composition of two or more hydrolyzates.

In a kind of microcapsule green pesticide preparation of the present invention, when animal glue and plant glue are used for the capsule skin, the pores of the capsule skin are small and uneven, and the release time specified by the requirements cannot be reached, so it is necessary to add foaming agent.

In the microcapsule green pesticide preparation of the present invention, the animal glue is gelatin; the plant glue is starch glue; and the seafood glue is isinglass and sodium alginate.

In the microcapsule green pesticide preparation of the present invention, the capsule core includes at least one pesticide active ingredient, surfactant, vegetable oil, auxiliary agent, diluting solvent and water.

A microcapsule green pesticide preparation of the present invention, when the active ingredient of the pesticide is solid, the capsule core also includes a solvent, and the solid original drug needs to be diluted into liquid first, and the solvent used in general is dimethylformamide , Pyrrolidone, Methanol, Formaldehyde.

A kind of microcapsule green pesticide preparation of the present invention, its described surfactant is tristyrylphenol polyoxyethylene ether, dibianyl biphenol polyoxyethylene ether, emulsifies the original medicine; Vegetable oil is cottonseed oil , rapeseed oil, and ricinoleic acid, which can separate the original drug from water, so as to facilitate the wrapping of the capsule skin, and the main object forms a capsule core; the auxiliary agents are calcium dodecylbenzenesulfonate, phenylethylphenol polyoxyethylene polyethene Oxypropylene ether and castor oil ethylene oxide adduct are used to adjust cations; the dilution solvent is xylene, which can dilute the original drug to the required level.

The preparation method of any microcapsule green pesticide preparation of the present invention comprises following processing steps:

a, the production of the capsule core, the original pesticide solvent is made into a liquid, adding adjuvant, vegetable oil, surfactant, and then adding a solvent to dilute, heating to 60-80°C, stirring continuously at the same time, and then adding a certain amount of water;

b. For the production of capsule skin, two or more kinds of glues from animal glue, vegetable glue, and seafood glue are firstly hydrolyzed, heated to 50-70°C, filtered, mixed, and stirred evenly. Can;

c, microcapsule preparation, pour the raw material of capsule skin in step b into the reaction kettle of capsule core in step a, mix and stir at a speed of 200-600 rpm, and pack after natural cooling for 2 hours.

In the preparation method of a microcapsule green pesticide preparation of the present invention, when the original pesticide is in a liquid state, no solvent is needed, and it can be directly mixed with other substances to form a capsule core.

According to the preparation method of a microcapsule green pesticide preparation of the present invention, antifreeze, dyes, etc. can be added before packaging, and the packaging can be carried out after stirring evenly.

The preparation method of a microcapsule green pesticide preparation of the present invention can be made into microcapsules with different particle diameters according to different crops and regions. When the release time of the pesticide is long, the particle diameter of the microcapsules can be made large Some, otherwise it can be smaller, and the particle size is generally controlled by controlling the stirring speed.

A microcapsule green pesticide preparation of the present invention uses organic macromolecules to wrap the pesticide effective body from the outside, and uses the lattice gaps of the macromolecular capsule wall to release it slowly, avoiding photolysis, volatilization, oxidation, and acid-base neutralization Reaction degradation, etc., thereby greatly reducing the use of the original drug and prolonging the duration of effect.

Compared with the prior art, a kind of microcapsule green pesticide preparation of the present invention and preparation method thereof have substantive characteristics and remarkable progress: 1, the capsular skin of microcapsule green pesticide preparation can be biodegradable completely, in the leaf of plant 2. The microencapsulated green pesticide preparation separates the oil phase from the water phase, so active substances that are unstable to water can be made into microencapsulated preparations for use in Spray application; 3. The microencapsulated green pesticide preparation inhibits the decomposition and loss of pesticides by light, heat, air, water, microorganisms and other chemical substances in the environment, improves the stability of the pesticide itself, and is beneficial to ecology and the environment; 4. The capsule skin of the microcapsule green pesticide preparation can reduce the volatility of the pesticide, mask its original odor, reduce its contact toxicity, inhalation toxicity and phytotoxicity, and reduce the irritation to humans and animals and the toxicity to fish; 5. Capsule green pesticide preparations have the function of controlled release, that is, artificially control the duration and release speed of pesticides, improve the utilization rate of pesticides, that is, improve the efficacy of pesticides, generally by 50-200%, and prolong their special effect period, thereby reducing the use of pesticides. The number and frequency of pesticides can improve the pressure of pesticides on the environment; 6. Microencapsulated green pesticide preparations provide great convenience for the effective compounding of various pesticide active substances with different properties; 7. Microencapsulated green pesticide preparations make the physical properties of pesticides It can be improved, drift can be reduced, and the liquid pesticide can be solidified, which is convenient for storage, transportation and use; 8. Reduce the overall cost of agriculture, which is 20-40% lower than that of ordinary emulsifiable concentrate.

(4) Specific implementation methods:

For better understanding and implementation, a microcapsule green pesticide preparation and its preparation method of the present invention will be described in detail below in conjunction with the examples.

Example 1, after mixing 3g fenvalerate and 7g malathion solution, add 0.5g calcium dodecylbenzenesulfonate, 0.5g phenylethylphenol polyoxyethylene polyoxypropylene ether, 3g castor oil, 3g Tristyrylphenol polyoxyethylene ether, 7g xylene, heated to 70°C, while stirring continuously, then added 15g water, set aside; 7.5g gelatin, 7.5g sodium alginate were added to 92g water for hydrolysis, respectively heated To 60°C, take 24g of the above-mentioned hydrolyzed glue solution, filter, mix after filtering, and stir evenly, add the uniformly stirred glue solution into the spare solution prepared above, mix and stir at a speed of 400 rpm, At the same time, after natural cooling for 2 hours, antifreeze and dyes are added, and then packaged to obtain the cyanoma microcapsule preparation.

Example 2, the production of the capsule core is the same as in Example 1, the difference is that the capsule skin is hydrolyzed by adding 7.5g of starch glue and 7.5g of gelatin to 92g of water respectively, heating to 60°C respectively, and taking 24g of the above-mentioned hydrolyzed glue solution Filter, mix after filtering, then add 1g foaming agent, and stir evenly.

Table 1 compares the duration of efficacy of the cyanoma microcapsules and 30% cyanoma EC in the prevention and treatment of peach borer.

Table 1 Test sample Dilution factor 1 day before medicine 7 days after medicine 14 days after the medicine 21 days after the medicine Egg rate Insect fruit rate growth rate Corrected anti-efficacy% growth rate Corrected anti-efficacy% growth rate Corrected anti-efficacy% Cyanoma Microcapsules 1500 5 1.0 0 100 0.2 98.18 1.6 90.59 30% Niomar EC 1500 3 0.5 0 100 0.5 86.36 6.6 61.18 control group clear water 4 1.0 4 / 11 / 17 /

Example 3, add 15g pyrrolidone to 2.5g imidacloprid to make a solution, then add 1g calcium dodecylbenzenesulfonate, 1g castor oil ethylene oxide adduct, 3g cottonseed oil, 3g dibianyl biphenol poly Oxyethylene ether, 15g xylene, heated to 80°C, while stirring continuously, then add 20g water, set aside; 7.5g gelatin, 7.5g starch glue, 7.5g sodium alginate were added to 92g water for hydrolysis, respectively heated to 70°C, take 16g of the above-mentioned hydrolyzed glue solution, filter, mix after filtering, and stir evenly, add the well-stirred glue solution into the spare solution prepared above, mix and stir at a speed of 600 rpm, and at the same time After cooling down naturally for 2 hours, it is packaged to obtain the imidacloprid microcapsule preparation.

Table 2 shows the comparison between the duration of efficacy of the imidacloprid microcapsules in the above example 3 and 5% imidacloprid wettable powder in the control of Spiraea aphid.

Table 2 Test sample Dilution factor Average number of aphids on leaves before treatment (head) 1 day before medicine 7 days after medicine 14 days after the medicine 21 days after the medicine Aphid/leaf (head) Corrected anti-efficacy% head/leaf Corrected anti-efficacy% head/leaf Corrected anti-efficacy% head/leaf Corrected anti-efficacy% imidacloprid microcapsules 1500 twenty one 0 100 0.1 99.80 0.3 99.80 32 87.50 5% imidacloprid wettable powder 1500 14 0 100 0 100 0.2 99.86 84.1 67.15 control group clear water 15 twenty four / 51 / 151 / 256 /

Example 4, add 20g dimethylformamide to 10g pyridaben to make a solution, then add 0.2g phenylethylphenol polyoxyethylene polyoxypropylene ether, 1g castor oil ethylene oxide adduct, 3g cabbage Seed oil, 3g tristyrylphenol polyoxyethylene ether, 5g xylene, heated to 60°C, while stirring continuously, then add 14g water, set aside; add 7.5g starch glue, 7.5g sodium alginate to 92g water respectively Carry out hydrolysis, heat to 50°C respectively, take 24g of the above-mentioned hydrolyzed glue solution and filter, mix after filtering, and stir evenly, add the well-stirred glue solution into the spare solution prepared above, and mix it at 200 rpm Mixing and stirring at a rotating speed, and cooling naturally for 2 hours at the same time, then packaging to obtain the pyridaben microcapsule preparation, and the particle diameter of the microcapsules is 2-10 microns.

Table 3 shows the comparison between the duration of efficacy of the pyridaben microcapsules in Example 4 and 20% pyridaben wettable powder in the prevention and treatment of the apple hawthorn spider mite.

table 3 Test sample Dilution factor Mouth base number head/leaf 1 day before medicine 7 days after medicine 14 days after the medicine 21 days after the medicine head/leaf Corrected anti-efficacy% head/leaf Corrected anti-efficacy% head/leaf Corrected anti-efficacy% head/leaf Corrected anti-efficacy% Pyridaben Microcapsules 2000 4 0.1 97.36 0.15 96.31 0.3 94.0 32 87.50 5% pyridaben wettable powder 2000 5 0.1 97.36 0.15 96.34 0.4 92.0 84.1 67.15 control group clear water 3 3.8 / 4.1 / 5.0 / 256 /

Claims (10)

1, a kind of microcapsules environment friendly agricultural preparation, it is made up of capsule nuclear and capsule skin, it is characterized in that described capsule suitcase draws together the composition of in animal glue, natural plant gum, the marine product glue two kinds and two or more hydrolysate.

2, by the described a kind of microcapsules environment friendly agricultural preparation of claim 1, it is characterized in that described capsule suitcase draws together animal glue, natural plant gum, also comprise blowing agent.

3, by claim 1 or 2 described a kind of microcapsules environment friendly agricultural preparations, it is characterized in that described animal glue is gelatin.

4, by claim 1 or 2 described a kind of microcapsules environment friendly agricultural preparations, it is characterized in that described natural plant gum is an amylan.

5, by claim 1 or 2 described a kind of microcapsules environment friendly agricultural preparations, it is characterized in that described marine product glue is fish glue, sodium alginate.

6,, it is characterized in that described capsule nuclear comprises at least a pesticide active ingredient, surfactant, vegetable oil, auxiliary agent, retarder thinner, water by the described a kind of microcapsules environment friendly agricultural preparation of claim 1.

7, by the described a kind of microcapsules environment friendly agricultural preparation of claim 6, when it is characterized in that described pesticide active ingredient is solid, capsule nuclear also comprises solvent.

8, by the described a kind of microcapsules environment friendly agricultural preparation of claim 7, it is characterized in that described solvent is dimethyl formamide, pyrrole Lip river alkane ketone, methyl alcohol, formaldehyde.

9, by the described a kind of microcapsules environment friendly agricultural preparation of claim 6, it is characterized in that described surfactant is triphen ethyl phenol APEO, two Bian Ji xenol APEOs; Vegetable oil is cottonseed oil, rapeseed oil, castor oil acid; Auxiliary agent is calcium dodecyl benzene sulfonate, phenethyl phenol polyethenoxy polyethenoxy ether, castor oil ethylene oxide adduct; Retarder thinner is a dimethylbenzene.

10, the preparation method of any one microcapsules environment friendly agricultural preparation of claim 1-9 comprises following processing step:

A, the making of capsule nuclear is made liquid with former agricultural chemicals with solvent, adds auxiliary agent, vegetable oil, surfactant, adds solvent again and dilutes, and is heated to 60-80 ℃, constantly stirs simultaneously, adds a certain amount of water again;

B, the making of capsule skin is carried out all kinds of glue respectively earlier with two or more the glue in animal glue, natural plant gum, the marine product glue and is separated, and is heated to 50-70 ℃ respectively, filters the back and mixes, and stirring gets final product;

C, microcapsule formulation is poured the capsule skin raw material of step b in the reactor of capsule nuclear of step a, mixes under 200-600 rev/min rotating speed and stirs, and after lowering the temperature 2 hours naturally simultaneously, packs.