FR2514999A1 - ADDITIVE FOR PESTICIDE COMPOSITIONS INTENDED TO BE SPRAYED FROM AIRCRAFT - Google Patents

Abstract

THE SUBJECT OF THE PRESENT INVENTION IS AN ADDITIVE FOR A PESTICIDE COMPOSITION INTENDED TO BE SPRAYED BY AIRCRAFT. THIS ADDITIVE IS IN THE FORM OF: -SODIUM POLYMETHACRYLATE WITH A MOLECULAR WEIGHT OF 5000 TO 90000 (IN AQUEOUS SOLUTION): 5 TO 95 BY WEIGHT; -GLYCERINE: 95 TO 5 BY WEIGHT, AND OPTIONALLY CONTAINS UP TO 10 BY WEIGHT OF LAURYL ALCOHOL POLYOXYETHYL.

Description

14999

  ADDITIVE FOR PESTICIDE COMPOSITIONS INTENDED

  TO BE SPRAYED FROM AIRCRAFT

  The subject of the present invention is an additive for suspensions, emulsions or aqueous solutions of pesticidal compositions intended for

  distributed by aircraft, which do not give rise to ef-

  wind blowing while allowing a good spray of the area to be treated. More particularly, the invention relates to an additive intended to

  to be added to the suspension, emulsion or aqueous solution

  3 to 30% by weight of the pesticide composition to be distributed by

  ronef, making it possible to spray the solution, the emulsion or the aqueous suspension without any dispersion occurring

  the action of the wind and making it possible to reach the target perfectly

  to say the culture one wants to treat) by covering it with a film

  very uniform droplets adhering perfectly to the vegetation.

  As is known, the treatment of crops by aircraft is achieved by a passage of the aircraft over these crops, at a height

  from 5 to 10 meters, and by spraying with an aqueous or sus-

  aqueous solution containing 3 to 30% of the selected pesticide The treatment is carried out using a distribution device or distribution consisting of a container, a pump and a rod or bar provided with nozzles or nozzles

  perpendicular to the line of movement of the aircraft.

  Due to the wind and weight loss experienced by the droplets

  during their fall as a result of the evaporation of water that occurs, there is a considerable dispersion of the spray solution or suspension, which leads to pollution of the surrounding areas and to insufficiently uniform coating or coverage of Areas to be treated Tests have been carried out to obviate such drawbacks by addition to suspensions, emulsions or spray solutions of cellulose derivatives or polyvinyl alcohol; these products "anti-workout"

  present, however, the disadvantage of inflating when they are sus-

  pension in water or dissolve after a certain period of time and

  sea, in the case of suspension, agglomerates and sediments that clog

  spray nozzles; moreover, they do not give rise to

  sufficient cation because they tend to form too large drops

and which scatter too much.

  The subject of the invention is therefore an additive capable of being added to aqueous suspensions or solutions containing 3 to 30% by weight of pesticide-based composition. This additive is capable of preventing the entrainment effect of emulsions. , suspensions or spray solutions and to obtain a uniform coverage of the crop to be treated in the form of small droplets adhering perfectly

to the vegetation.

  The present invention also relates to a method for the selective coating of selected crops, using a pesticide composition, by aircraft without polluting crops adjacent areas. The subject of the present invention is additives which can be added to suspensions, emulsions or aqueous solutions of pesticidal compositions, these additives being formed of: sodium polymethyl methacrylate having a molecular weight of between 5 000 and 90 000 of 5 to 95% in weight; glycerine 95 to 5% by weight;

  polyoxyethylated lauryl alcohol can be added to

  portions up to 10% by weight based on the weight of the additive.

  Such an additive may be added to the solution, the emulsion or the aqueous suspension containing from 3 to 30% by weight of the composition chosen in such proportions that it is possible to distribute from 200 g to 2000 g of additive per hectare depending on climatic conditions The mixture

  thus obtained is ready for being sprayed with aircraft.

  As a composition, it is possible to use any of the water-soluble, hydroemulsifiable or water-sensitive compositions; it is possible to use moisturizing powders, emulsions, suspensions of known pesticides such as ethylene-bis-dithiocarbamate

  zinc and / or manganese, copper oxychloride, N- (trichloromethyl) -

  phthalimide, N- (triochloromethylthio) -cyclohex-4-ene-1,2-dicarboxymide,

  N-dodecylguanidine acetate, humidifiable sulfur, dinitro- (1-methyl)

  heptyl) -phenylcrotonate, 2-phenyl-N- (2,6-dimethyl-phenyl) -N- (1-methoxy)

2514-999

  carbonyl-ethyl) -acetamide, N- (3,5-dichlorophenyl) -5-methyl-5-carbethoxy-

  oxazolidine-2,4-dione, zinc dimethyldithiocarbamate, propylene bis

  zinc dithiocarbamate and mixtures thereof and other compounds, provided they are capable of being suspended, solubilised, emulsified in water, so as to lead to suspension, a solution

  or an emulsion containing 3 to 30% by weight of the pesticidal composition.

  Glycerin and sodium polymethacrylate having a molecular weight of

  5,000 to 90,000 cells are completely soluble in water.

  Such suspensions or solutions containing an additive do not leave sediment, do not swell, form instantly and do not clog the spray nozzles. When sprayed, they fall directly onto their targets, without deviating, and cover the vegetation below. -Jacent, using a film of small droplets

  uniforms that adhere perfectly to the vegetation.

  The preparation of the additive composition can be obtained by adding the selected amount of glycerin to the selected amount of sodium polymethacrylate, preferably in aqueous concentrated solution.

  (containing about 3% by weight of polymethacrylate).

  Where appropriate, a selected amount of polyoxy-lauryl alcohol

  thylate is then added to the mixture of the other constituents.

  Other objects and advantages of the present invention will become apparent

  upon reading the following description.

EXAMPLE

  To determine the drag effect, a strip is drawn on the ground corresponding to the projection of a rod equipped with nozzles or nozzles, carried by a helicopter, from which the suspension, solution or emulsion is sprayed. the band is marked the flight line

  followed by the airplane This strip is 20 meters wide and 1 kilometer long.

  Glass plates are placed at regular intervals on this strip

  in order to determine the coating or covering that said composi-

  This band is then widened by 2 meters on each of its sides

  to form a second strip having a width of 24 meters on the

  which glass plates are also placed at regular intervals.

  This second plate is used to determine the ripple effect.

  The hiding effect is detected on both flat glass plates.

  on the ground and on existing vegetation, either in view or by incorporation into the suspension composition of a tracer light-sensitive Wood The helicopter moves at an altitude of 10 meters

above this band.

  The pesticides tested have the following composition: zinc ethylene-bisdithiocarbamate 80% sodium dodecylbenzene sulfonate 5% sodium lignin sulphonate 5% kaolin, enough to obtain 100 manganese ethylene-bis-dithiocarbamate 40% sodium sulphosuccinate 3% lignin sulphonate d ammonium 5% polysaccharide biopolymerized 0.1% water, sufficient amount to reach 100 These compositions are dispersed in water, at a rate of 3% by weight for the first, and 6% by weight for the second. the following constituents are added:

  In test A: 1 kg per hectare of vegetation to be sprayed, a solution

  of (supplement per weight portion): sodium polymethacrylate 16.5% glycerin 40% polyoxyethylated lauryl alcohol 5% water 38.5% tracer light-sensitive Wood 1 Such a solution corresponds to an additive composition formed from sodium polymethyl methacrylate 26.8% by weight glycerine 65% by weight polyoxyethyl lauryl alcohol 8.2% by weight In test B: 1 kg per hectare of vegetation to be sprayed, of an additive formed of 50% by weight of hydroxyethylcellulose, 20% by weight of ethoxylated lauryl alcohol, 30% of inert material and the same amount of

tracer than above.

  In test C: 0.5 kg of a mixture of 50% polyvinyl alcohol, 20% ethoxylated lauryl alcohol and 30% of inert

  than the same amount of tracer.

  It has been found that in the "B" and "C" cases, the additive forms sediments and agglomerates in the suspension, while in the test

  A, the additive dissolves leaving the suspension unaltered.

  or distribution is carried out using a rod perpendicular to the flight line of a helicopter; this stem, which is 14 meters long, is equipped with 70 nozzles of 1.5 mm diameter, spaced 20 cm apart

each other.

  When the suspension obtained from composition A is used, no remarkable deviation (at most 1 to 2 meters beyond the limit of the 20 meter band) is observed and the vegetation and the glass plates They are uniformly covered with droplets of the suspension. No clogging of the tuyeres could be observed. On the other hand, when using the suspension obtained from compositions B and C, deviations of up to 25 meters can be observed. beyond the fixed limit of 20 meters, are obtained; covering vegetation and

  plates of glass is not very uniform and is insufficient because of the evapo-

  ration of the water contained in the sprayed droplets Clogging

  spray nozzles often occur.

  Of course, the invention is not limited to the modes of

  described and represented and it is capable of numerous variants accessible to those skilled in the art, without departing from the spirit of

the invention.

Claims (2)

  1. Additive for pesticide compositions intended to be sprayed   prepared by means of aqueous solutions, dispersions or emulsions containing 3 to 30% by weight of said compositions, said additive being formed of: sodium polymethacrylate having a molecular weight of from 5,000 to 90,000 (in aqueous solution) 5 to 95 % by weight glycerin 95 to 5% by weight and optionally containing up to 10% by weight of lauryl alcohol pol yoxyethyl é.   2. Method for preventing entrainment of solutions, emulsions   or aqueous suspensions containing 3 to 30% by weight of weighing composition   ticide intended to be sprayed with an aircraft, which method comprises adding to the solution, emulsion or aqueous suspension of said pesticidal composition, an additive according to claim 1 in an amount between 200 and 2000 g per hectare of culture to be sprayed.