CN102396450A - Pendimethalin suspension and preparation method thereof - Google Patents

Abstract

The invention provides pendimethalin suspension, which comprises the following components in percentage by weight: 38 to 42 percent of pendimethalin, 0.1 to 6 percent of acrylic acid-maleic anhydride copolymer, 0.1 to 6 percent of polyoxyethylene ether, 2 to 3.5 percent of naphthalene sulfonate polycondensate, 0.4 to 1.2 percent of alkyl naphthalene sulfonate, 0.05 to 0.15 percent of xanthan gum, 0.01 to 0.5 percent of isooctanol, 0.3 to 4.0 percent of dimethyl silicon oil, 4.5 to 5.5 percent of ethylene glycol, 0.1 percent of sodium benzoate and the balance of water. The preparation method comprises: adding pendimethalin, acrylic acid-maleic anhydride copolymer, polyoxyethylene ether, naphthalene sulfonate polycondensate, alkyl naphthalene sulfonate and isooctanol into water; and grinding for 1 hour in a wet-process grinder, adding xanthan gum, dimethyl silicon oil, ethylene glycol, sodium benzoate and the balance of water, stirring, coarsely grinding till 10 micrometers, transferring to a sand grinder, performing superfine grinding and obtaining the pendimethalin suspension. The pendimethalin suspension has the characteristics of high suspension rate, high stability, wide application range, high efficiency and low toxicity, safety, environment protection and low cost. The pendimethalin suspension is an environment-friendly water-base preparation advocated by China.

Description

Pendimethalin suspending agent and preparation method thereof

One, technical field

The invention belongs to the agricultural chemicals category, relate to a kind of dry crop selective herbicide, be specially a kind of pendimethalin suspending agent.

Two, background technology

Pendimethalin is also referred to as Pendimethalin, molecular formula C13H19N3O4, molecular mass 281.31.Pure article are orange colour crystalline solid, fusing point 54-58 ℃, and, 0.275mg/L in 25 ℃ of water of solvability is soluble in organic solvents such as acetone, xylol.Pendimethalin is that upland field soil is handled weed killer herbicide before the selectivity bud, behind the bud.Weeds absorb medicament through the young shoot of sprouting, and the medicament that gets in the plant corpus combines with tubulin, suppress the mitosis of plant cell, thereby cause weeds dead.At present, pendimethalin is the world's the 3rd big weed killer herbicide, and usage amount is only second to steriland herbicide glyphosate, paraquat, also is the maximum selective herbicide of usage amount in the world.Preventing and kill off object is annual gramineous weed, part broad leaved weed and nutgrass flatsedge.Like barnyard grass grass, lady's-grass, green foxtail, moleplant seed, eleusine indica, kitchen garden, amaranth, lamb's-quarters, piemarker, black nightshade, cyperus iria, difformed galingale herb etc.Preventive effect to grassy weed is superior to broad leaved weed, to the perennial weed weak effect.Applicable crops has multiple dry land such as cotton, corn, direct-seeding dry rice, soybean, peanut, potato, garlic, wild cabbage, Chinese cabbage, leek, green onion, ginger and paddy drought seedling field etc.

Producing at present and going up the pendimethalin common formulations of using is 33% pendimethalin missible oil.Be the weed killer herbicide kind of just being used by large-scale popularization in recent years, preventing weeding weeds effect is good and to crop safety, is the substitute products of traditional weed killer herbicide such as trefanocide, by peasant household's well recognized and use.33% pendimethalin missible oil is only annual in Xinjiang to use about 3000 tons, the about 1,500 ten thousand mu of ground of usable floor area.But 33% pendimethalin missible oil product contains organic solvents such as a large amount of toluene, xylol.These organic solvents drop in the soil, and meeting heavy damage soil structure changes soil physico-chemical property, influences budding and root growth.A large amount of organic solvents also can change the aqueous vapor exchange of soil and external environment, also influence the migration mode of nutriment in soil.Ooze also under the organic solvent and can cause groundwater contamination, water source safety is constituted a threat to.It is in above situation, and China agricultural chemicals administrative department has stopped issuing of missible oil new product certificate, progressively compresses the ratio of missible oil product, advocates environment-friendly water-basedization of development registration product.

Be published in the last article of inscribeing one's name to " development of 40% pendimethalin prometryn suspending agent " of " modern agricultural chemicals " magazine third phase in 2008 and disclose a kind of pendimethalin suspending agent.But this suspending agent is the binary built preparation, makes the scope of application of this product be very limited.Application number is 201010553533.4 Chinese patent disclosed " a kind of composition pesticide that contains pendimethalin and preparation method thereof ".Said composition comprises the former medicine 0.1-50 of pendimethalin weight portion, wetting dispersing agent 2-10 weight portion, special assistant 1-3 weight portion, deflocculant 1-3 weight portion, water 0.1-100 weight portion.But said preparation effective ingredient luffing is bigger, and herbicidal effect has uncertainty, and practicality is relatively poor.Exploitation has that applied widely, herbicidal effect is stable, the pendimethalin suspending agent of safety and environmental protection has important practical significance.

Three, summary of the invention

The present invention seeks to that applied widely, herbicidal effect is stable in order to provide, safety and environmental protection, pendimethalin suspending agent and preparation technology thereof that production cost is lower.Pendimethalin suspending agent provided by the invention contains compositions such as surfactant, wetting dispersing agent, stabilizing agent, thickener, antifoaming agent, antifreezing agent, and the component of this suspending agent constitutes and weight percent content is: pendimethalin 38%-42%; Acrylic acid copolymer-maleic anhydride 0.1-6%, APEO 0.1-6%, polycondensation naphthalene sulfonate 2%-3.5%; Fluhyzon hydrochlorate 0.4-1.2%; Xanthans 0.05%-0.15%, isooctanol 0.01-0.5%, dimethicone 0.3%-4.0%; Ethylene glycol 4.5%-5.5%, Sodium Benzoate 0.1%.Water surplus.

The manufacture craft of this suspending agent is: pendimethalin, the acrylic acid copolymer-maleic anhydride that will meet above-mentioned percentage by weight; APEO, polycondensation naphthalene sulfonate, Fluhyzon hydrochlorate, isooctanol adds in the entry; Wet process disintegrator ground 1 hour; Add xanthans, dimethicone, ethylene glycol again, the water of Sodium Benzoate and surplus stirs the back corase grind and after 10 microns, changes the sand mill extra-fine grinding over to, makes particle diameter reach the 2-3 micron and has both made finished product.Strict during this time control processing temperature is no more than 50 ℃.

Acrylic acid copolymer-maleic anhydride and APEO are surfactants, and effect is to form the oil-in-water anion at former medicine particle surface, reduces cohesion; The polycondensation naphthalene sulfonate is a dispersant, and the Fluhyzon hydrochlorate is a wetting agent, guarantees particle stabilized being distributed in the colloidal suspension agent; Xanthans is a thickener, and isooctanol is a stabilizing agent, and dimethicone is an antifoaming agent, and ethylene glycol is antifreezing agent, and Sodium Benzoate is a preservative.These auxiliary agent synergies guarantee that suspending agent is stable.

Pendimethalin suspending agent product provided by the invention is a functional component with the pendimethalin of 40% left and right sides content; Choose the surfactant of acrylic acid copolymer-maleic anhydride, two kinds of material assembly of APEO; And dispersant polycondensation naphthalene sulfonate, wetting agent Fluhyzon hydrochlorate; Through assembly rationally, reached stronger suspension wettability effect, be equipped with auxiliary agents such as xanthans, isooctanol stabilizing agent, dimethicone antifoaming agent, ethylene glycol, Sodium Benzoate preservative again.These grades component synergy causes product of the present invention to have suspensibility height, good stability, applied widely, high-efficiency low-toxicity, safety and environmental protection, characteristics with low cost.Particularly this product is carrier with water, substitutes organic solvent, is the environment protection water-basedization formulation that country advocates.

This product detects index can reach following standard: suspensibility>=90%, screen analysis>=99% is toppled over back residue≤3.0%, washing back residue≤0.5%, lasting foaming characteristic≤25ml.

Recommendation using dosage when this product uses as the cotton field weed killer herbicide is 120-160ml/ mu, and closed soil treatment was advisable before employing was broadcast.

Four, embodiment

Embodiment 1: each component of the present invention and heavy percentage thereof constitute: pendimethalin 40%, acrylic acid copolymer-maleic anhydride 2%, APEO 1.8%; Polycondensation naphthalene sulfonate 3%, Fluhyzon hydrochlorate 1%, xanthans 0.1%; Isooctanol 0.01%, dimethicone 0.3%, ethylene glycol 5%; Sodium Benzoate 0.1%, water surplus.

Its preparation technology's method is: pendimethalin, the acrylic acid copolymer-maleic anhydride that will meet above-mentioned percentage by weight; APEO, polycondensation naphthalene sulfonate, Fluhyzon hydrochlorate, isooctanol adds in the entry; Wet process disintegrator ground 1 hour; Add xanthans, dimethicone, ethylene glycol again, the water of Sodium Benzoate and surplus stirs the back corase grind and after 10 microns, changes the sand mill extra-fine grinding over to, makes particle diameter reach the 2-3 micron and has both made finished product.Strict during this time control processing temperature is no more than 50 ℃.Except that pendimethalin, other raw material is food-grade.

The product of present embodiment small plot experiment in 2010; 40% pendimethalin suspending agent amount of application is respectively 120ml/ mu, 150ml/ mu, 180ml/ mu, four gradients of 200ml/ mu; And with 33% pendimethalin missible oil of consumption, the trefanocide of conventional amount used carries out the herbicidal effect contrast.Cotton is broadcast preceding closed soil treatment, planting after plastic covered.When carrying out after the medication 30 days, 50 days respectively the preventive effect of local four kinds of main cotton field weeds barnyard grass grass, oak-leaved goosefeet, kitchen garden, field bindweed is investigated.These article of actual observation are suitable at the corresponding 33% pendimethalin missible oil 150ML of every mu of 120ML, 150ML, 180ML, 180ML, 220ML preventing weeding weeds effect, and also promptly a mu consumption is less than 33% pendimethalin missible oil.Each is handled all has inhibitory action and control efficiency approaching to field bindweed.The integrated control effect of 40% pendimethalin suspending agent and 33% pendimethalin missible oil all is superior to trefanocide.The present embodiment product increases along with the increase of dosage the preventive effect of oak-leaved goosefeet and barnyard grass grass.And it is not remarkable to the control of weeds difference on effect behind 150-200ml/ mu when the dosage of pendimethalin, thereby proof 150ml/ mu is the preferable using dosage of this product.

Because the present embodiment product is a carrier with water, cost of material is low, and its unit cost of production is than 33% missible oil low about 10%.The relative consumption of this product is few in addition, so use cost is than 33% missible oil low about 15%.

Embodiment 2: each component of the present invention and heavy percentage thereof constitute: pendimethalin 39%, acrylic acid copolymer-maleic anhydride 2%, APEO 1.8%; Polycondensation naphthalene sulfonate 2%, Fluhyzon hydrochlorate 0.7%, xanthans 0.1%; Isooctanol 0.01%, dimethicone 0.3%, ethylene glycol 5%; Sodium Benzoate 0.1%, water surplus.

Its preparation technology's method is with embodiment 1.

The sand of the product of embodiment 2 2010 Aksu Prefecture in Xinjiang enters center, sub-reclamation area and observes and predicts the station and carry out the land for growing field crops application test.Three usage amount gradients of this product are respectively 100ml/ mu, 150ml/ mu, 200ml/ mu, and contrasting is that 120ml/ mu dish grass leads to missible oil (33% pendimethalin missible oil).Broadcast preceding closed soil treatment.Emergence rate, weed control efficacy, output of cotton are investigated.Result of the test shows, when this product low dosage uses cotton being emerged does not have influence.In weed control, three consumptions of this product are all compared effective according to medicament, and are especially higher to the conventional weeds barnyard grass grass in cotton field, oak-leaved goosefeet preventive effect.See that from output of cotton three processing of this product are all high than 33% pendimethalin missible oil.

Claims (3)

1. a pendimethalin suspending agent contains compositions such as surfactant, wetting dispersing agent, stabilizing agent, thickener, antifoaming agent, antifreezing agent, it is characterized in that the component formation and the weight percent content of this suspending agent is: pendimethalin 38%-42%; Acrylic acid copolymer-maleic anhydride 0.1-6%, APEO 0.1-6%, polycondensation naphthalene sulfonate 2%-3.5%; Fluhyzon hydrochlorate 0.4-1.2%, xanthans 0.05%-0.15%, isooctanol 0.01-0.5%; Dimethicone 0.3%-4.0%; Ethylene glycol 4.5%-5.5%, Sodium Benzoate 0.1%, water surplus.

2. suspending agent as claimed in claim 1 is characterized in that the component formation and the weight percent content of this suspending agent is: pendimethalin 40%, acrylic acid copolymer-maleic anhydride 2%; APEO 1.8%, polycondensation naphthalene sulfonate 3%, Fluhyzon hydrochlorate 1%; Xanthans 0.1%, isooctanol 0.01%, dimethicone 0.3%; Ethylene glycol 5%, Sodium Benzoate 0.1%, water surplus.

3. according to claim 1 or claim 2 suspending agent; The preparation technology who it is characterized in that this suspending agent is: pendimethalin, the acrylic acid copolymer-maleic anhydride that will meet above-mentioned percentage by weight; APEO, polycondensation naphthalene sulfonate, Fluhyzon hydrochlorate, isooctanol adds in the entry; Wet process disintegrator ground 1 hour; Add xanthans, dimethicone, ethylene glycol again, the water of Sodium Benzoate and surplus stirs the back corase grind and after 10 microns, changes the sand mill extra-fine grinding over to, makes particle diameter reach the 2-3 micron and has both made finished product; Strict during this time control processing temperature is no more than 50 ℃.