CN1313004C - Granular agent containing chlorpysifos and its preparation method - Google Patents

Abstract

The present invention provides a granule for mainly preventing and curing soil insects and a preparation method of the granule. Clorpyrifos of the preparation has active shares, one of acid soil, attapulgite soil, kieselguhr, kaolin, swell soil and talc, or the mixture of more than one of the acid soil, the attapulgite soil, the kieselguhr, the kaolin, the swell soil and the talc are used as a carrier, and one of wood dust, straw powder, rice spermoderm and white carbon black ore the mixture of more than one of the wood dust, the straw powder, the rice spermoderm and the white carbon black ore is used as an adsorbent. The preparation method comprises: the clorpyrifos, the carrier, the adsorbent and the water are mixed evenly to form wet materials, the wet materials enter an extrusion granulation machine for granulation, and the chlorpyrifos granule with the content of 1 to 20% is formed after the granules are dried.

Description

A granule containing chlorpyrifos

Technical field

The invention relates to a preparation method of a pesticide preparation granule whose active ingredient is chlorpyrifos and is mainly used for preventing and controlling underground pests.

Background technique

Chlorpyrifos (English name chlorpyrifos), chemical name O, O-diethyl-O (3,5,6-trichloro-2-pyridyl) phosphorothioate, also known as Lesben (Dow AgroSciences, Inc. Product name), Anminle, Keleshi, etc., were first developed by DOW Chemical Company of the United States in 1965. It is an organophosphorus insecticide and acaricide with high efficiency, broad spectrum and low toxicity. More than 20 years of application have proved that the use concentration has not increased, and pests have basically no resistance to it. Chlorpyrifos mainly controls pests through three modes of action: contact killing, stomach poisoning and fumigation. The insecticidal spectrum can be compared with methamidophos, but the toxicity is much lower than that of methamidophos, which belongs to moderate toxicity and is low toxicity among organophosphorus insecticides. It can be widely used in many fields such as rice, wheat, cotton, vegetables, fruit trees, tea trees, and hygiene. Red spider mite, tea inchworm, larvae, cockroach and other pests are all effective, and they are widely used in domestic and foreign applications, and are ideal large-tonnage varieties to replace highly toxic pesticides. Its structural formula is:

R is methyl or ethyl

If R is ethyl, it is called chlorpyrifos ethyl (chlorpyrifos for short), if R is methyl, it is called chlorpyrifos methyl, and chlorpyrifos ethyl is widely used in my country.

Chlorpyrifos is usually used in agriculture and non-agriculture in the form of emulsifiable concentrate or water emulsion. However, due to the rapid release of the drug during the use of its commonly used emulsifiable concentrate preparation, and the drift during spraying, it often only exerts 60-70% of the drug effect. It cannot be well utilized. In order to overcome these shortcomings, people have innovated the preparations of chlorpyrifos one after another. A large number of chlorpyrifos compound agents have appeared, all of which are to improve penetration, adsorption, etc., thereby reducing the dosage, so as to achieve full utilization and improve For the purpose of drug efficacy, there are many kinds of chlorpyrifos single agent or compound preparations on the market. For example, the invention patent application with application number 01100515 discloses the compound of imidacloprid and chlorpyrifos, which has special control effect on apple aphid; application number The invention patent application of No. 01100511 discloses the compounding of abamectin and chlorpyrifos, which has special control effect on pear psyllid; the invention patent application of application number 00128287 discloses the compounding of triazophos and chlorpyrifos, which is mainly used to control rice borers; application number 98111820 patent application for invention discloses the compounding of pyrethroid insecticides and chlorpyrifos to improve efficacy; The main purpose is to improve the long-lasting effect; the invention patent application with the application number 98122084 discloses the compounded emulsifiable concentrate of dichlorvos and chlorpyrifos, and the main purpose is to increase the efficiency; the invention patent application with the application number 93120345 discloses methyl parathion The combination with phoxim and chlorpyrifos is mainly used for the control of cotton bollworm.

Granules are easy to spread and have almost no drift phenomenon. Therefore, they are now more and more widely used in various fields. Granules can slowly control drug release, so they can also be administered at an accurate and optimal dose to achieve The purpose of long-term prevention and control, and this is what people hope.

In order to inhibit the rapid release of pesticides, many pesticides are made into granules, such as carbofuran and monosultap. However, most granules use materials with high bulk density such as crushed stones and fine sand as carriers. This method has low manufacturing cost, but its disadvantages are that the specific surface area of the particles is large, the contact surface with the control object is small, and the application is uneven. , poor adsorption. It has also been suggested to use paraffin wax in the preparation of granules in the past, but the disadvantage of this method is that the surface tension with water is high, the active ingredient cannot be fully released, and it is necessary to melt the paraffin wax and mix it with other components. Therefore, the methods for preparing these granules are complicated.

The object of the present invention is to provide a granule with chlorpyrifos as an active component and a preparation method thereof, which are mainly used for preventing and controlling underground pests.

Contents of the invention

The invention uses chlorpyrifos as the active ingredient, uniformly disperses it in one or more carriers and adsorbents, granulates through an extruding granulator, and is ready after drying.

The carrier is one or a mixture of acidic clay, attapulgite, diatomite, kaolin, bentonite, talc and starch. Its consumption accounts for 50-80% of total weight.

The adsorbent is a mixture of one or more of wood chips, straw powder, rice bran, and self-carbon black, preferably straw powder and rice bran. Its consumption accounts for 5-40% of total weight.

The active ingredient used in the present invention is chlorpyrifos, which can be the original drug with a content of more than 85%, or can be directly obtained from the production process without purification and also contains organic solvent semi-finished products such as toluene (called oil benzene), which contains 15-84% chlorpyrifos. When high content of the original drug is used, since chlorpyrifos is solid at room temperature, in order to mix it evenly, it needs to be melted into a liquid state and then mixed with the carrier and adsorbent by mechanical stirring. If a low content of benzene is used to prepare, since it is already in a liquid state, it does not need to be melted. The preparation is mainly applied in the soil for the prevention and control of underground pests, and the lower content is conducive to uniform dispersion during application. Therefore, the content of the active ingredient chlorpyrifos is preferably 1-20% in the present invention.

The preparation method of the granule of the present invention: (1) uniformly mix the material containing chlorpyrifos with the carrier, the adsorbent and water to obtain the wet material I; (2) granulate the I through an extrusion granulator to obtain the granule II; (3) Dry II.

In order to facilitate granulation, the content of volatile components (mainly water, toluene, etc. carried in the original drug) in the wet material I should be controlled to be 1-20%, preferably 5-8%.

After drying, the particle size of the granules can be adjusted optionally, and the particle size range of 0.2-3mm can be selected after sieving. The particles with too large particle size can be concentrated, crushed and then sieved, and the remaining powder can be returned to the granulation system. . Of course, products in other particle size ranges can also be obtained by adjusting the granulator.

The granules of the present invention have many advantages: (1) preparation is simple and convenient; (2) can control the slow release of active ingredients; (3) the bulk density is small, about one time less than that of general granules; The surface area increases, which is conducive to uniform spreading, can effectively play the role of its active ingredients, and reduce the dosage; (5) the use of environmentally friendly adsorbents is environmentally safe, and can be used as organic fertilizers after decomposition, which is comparable to existing granules. In comparison, the granules of the present invention are more suitable for the prevention and control of underground pests, and are applied to places where mosquitoes and flies live, such as gutters, paddy fields, and weeds, to prevent the breeding of mosquito and fly larvae.

Detailed ways

The present invention will be described by specific examples. The formulations used in the examples are only part of the present invention and should not be construed as a limitation of the present invention.

Embodiment 1: get 95% chlorpyrifos former medicine 10.526kg, attapulgite 60kg, rice bran 29.474kg, water 10kg, the former medicine of chlorpyrifos is heated and melted, add attapulgite, rice bran, water, stir and mix, and then Transfer to an extrusion granulator for granulation, finally dry, and sieve to obtain 10% chlorpyrifos granules.

Embodiment 2: get 6.25kg of benzene containing chlorpyrifos 80%, acid white clay 30kg, kaolin 40kg, straw powder 25kg, water 5kg, embodiment is the same as embodiment 1, gets 5% chlorpyrifos granule.

Embodiment 3: get 21.05kg of 95% chlorpyrifos technical material, 30kg of diatomite, 30kg of bentonite, 18.95kg of sawdust, 10kg of water, embodiment is the same as embodiment 1, obtains 20% chlorpyrifos granule.

Embodiment 4: Adopt the 10% chlorpyrifos granule that embodiment 1 makes, be used for preventing and treating sugarcane tortoise and leek maggot respectively in Guangdong and Shandong, for underground pest drug effect is better than the emulsifiable concentrate of the same active ingredient, field efficacy test result as follows:

Field Test of Controlling Sugarcane Turtle with 10% Chlorpyrifos Granules deal with repeat 30 days after medicine Total number of seedlings Dead heart seedling number Dry heart rate (%) Anti-efficacy (%) 10% chlorpyrifos granules 800 g/mu 1 348 9 2.59 77.04 2 344 8 2.33 80.04 3 272 7 2.57 77.22 4 420 12 2.86 74.65 average - - - 77.24 10% chlorpyrifos granules 1200 g/mu 1 336 8 2.38 76.77 2 352 6 1.70 85.37 3 441 4 0.91 93.49 4 387 5 1.29 88.55 average - - - 86.05 10% chlorpyrifos granules 1500 g/mu 1 372 4 1.08 89.51 2 396 7 1.77 84.83 3 388 6 1.55 88.91 4 376 5 1.33 88.21 average - - - 87.86 40% Chlorpyrifos EC 400ml/mu 1 320 6 1.88 83.33 2 308 7 2.27 79.88 3 418 9 2.15 80.94 4 380 8 2.11 81.29 average - - - 81.36 40% Chlorpyrifos EC 500ml/mu 1 369 8 2.17 78.85 2 347 4 1.15 90.11 3 382 3 0.79 94.37 4 396 6 1.52 86.57 total - - - 87.47 CK 1 361 37 10.25 - 2 412 48 11.65 - 3 373 52 13.94 - 4 390 44 11.28 -

Experiment on the effect of 10% chlorpyrifos granule on controlling chive maggots and preserving seedlings Test treatment (mu dosage) repeat Investigate the number of leek seedlings The number of damaged leek seedlings Victim rate (%) Seedling protection effect (%) 1st 2nd the 3rd time 4th total 10% Chlorpyrifos Granules 800g 1 129 4 2 3 3 12 9.30 88.41 2 141 4 1 3 4 12 8.51 89.03 3 129 5 1 2 5 13 10.08 86.53 4 135 2 2 3 3 10 7.41 90.48 total 534 15 6 11 15 47 8.80 88.67 10% Chlorpyrifos Granules 1200g 1 126 1 0 0 0 1 0.79 99.20 2 151 1 0 1 2 4 2.65 96.58 3 130 1 0 0 0 1 0.77 98.97 4 133 1 0 1 1 3 2.26 97.10 total 540 4 0 2 3 9 1.67 97.85 10% Chlorpyrifos Granules 1500g 1 145 1 0 0 0 1 0.69 99.14 2 136 0 0 0 0 0 0 100 3 147 1 0 1 1 3 2.04 97.27 4 141 0 0 0 1 1 0.71 99.09 total 569 2 0 1 2 5 0.88 98.87 40% Lesbourne 300ml 1 129 3 1 1 4 9 6.98 91.01 2 138 3 2 2 3 10 7.25 90.67 3 125 2 1 3 2 8 6.40 91.76 4 140 3 2 2 4 11 7.86 89.88 total 531 11 6 8 13 38 7.16 90.83 CK 1 147 11 20 59 28 118 80.27 - 2 147 10 19 58 27 114 77.55 - 3 139 9 15 56 twenty four 104 74.82 - 4 149 10 17 61 28 116 77.85 - total 582 40 71 234 107 452 77.66 -

Claims (1)

1. A granule for preventing and controlling underground pests is characterized in that it is composed of the following components: A weight content is 1-20% active component chlorpyrifos; B is a carrier with a weight content of 50-80%; C weight content is the adsorbent of 5-40%; Wherein the carrier is acid clay, attapulgite, diatomaceous earth, kaolin, bentonite, talc, starch or a mixture of more than one; the adsorbent is wood chips, straw powder, rice bran , One or more mixtures of white carbon black.