CN102396450B - 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 suspension and preparation method thereof

One, technical field

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

Two, background technology

Pendimethalin also referred to as Pendimethalin, molecular formula C13H19N3O4, molecular mass 281.31.Sterling is orange crystals solid, fusing point 54-58 DEG C, 0.275mg/L in solvability 25 DEG C of water, is soluble in the organic solvent such as acetone, dimethylbenzene.Pendimethalin is upland field soil process weed killer herbicide before selectivity bud, after bud.Weeds absorb medicament by the young shoot sprouted, and enter the medicament in plant corpus and tubulin binding, suppress the mitosis of plant cell, thus cause weeds dead.At present, pendimethalin is the large weed killer herbicide in the world the 3rd, and usage amount is only second to steriland herbicide glyphosate, paraquat, is also the selective herbicide that usage amount is maximum in the world.Preventing and kill off object is annual gramineous weed, part broad leaved weed and nutgrass flatsedge.As barnyard 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.Broad leaved weed is better than to the preventive effect of grassy weed, to perennial weed weak effect.Applicable crops has the multiple dry land such as cotton, corn, direct-seeding dry rice, soybean, peanut, potato, garlic, wild cabbage, Chinese cabbage, leek, green onion, ginger and arid rice nursery etc.

The pendimethalin common formulations that current production is applied is 33% pendimethalin missible oil.Be in recent years just by the weed killer herbicide kind that large-scale popularization uses, preventing weeding weeds effect is good and to crop safety, be the substitute products of traditional weed killer herbicides such as trefanocide, is extensively admitted by peasant household and uses.33% pendimethalin missible oil only uses about 3000 tons every year in Xinjiang, usable floor area about 1,500 ten thousand mu of ground.But 33% pendimethalin missible oil product contains the organic solvents such as a large amount of toluene, dimethylbenzene.These organic solvents drop in soil, and meeting heavy damage soil structure, changes soil physico-chemical property, affect budding and root growth.A large amount of organic solvent also can change the water_air exchange of soil and external environment, also affects the Migration mark of nutriment in soil.Ooze under organic solvent and also can cause groundwater contamination, the safety of water source is constituted a threat to.It is in above situation, and agricultural chemicals administrative department of China has stopped issuing of missible oil new product certificate, progressively compresses the ratio of missible oil product, advocates development registration environment-friendly water-basedization product.

Be published in " modern " magazine third phase in 2008 upper article inscribeed one's name as " development of 40% pendimethalin prometryn suspending agent " and disclose a kind of pendimethalin suspension.But this suspending agent is binary built preparation, the scope of application of this product is very limited.Application number is the Chinese patent disclosed " a kind of composition pesticide containing pendimethalin and preparation method thereof " of 201010553533.4.Described composition comprises pendimethalin former medicine 0.1-50 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 comparatively large, and herbicidal effect has uncertainty, and practicality is poor.Exploitation have applied widely, herbicidal effect is stablized, the pendimethalin suspension of safety and environmental protection has important practical significance.

Three, summary of the invention

The present invention seeks to provide applied widely, herbicidal effect is stablized, safety and environmental protection, production cost are lower pendimethalin suspension and preparation technology thereof.Pendimethalin suspension provided by the invention, containing compositions such as surfactant, wetting dispersing agent, stabilizing agent, thickener, defoamer, antifreezing agents, the component of this suspending agent forms 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: will meet pendimethalin, the acrylic acid copolymer-maleic anhydride of above-mentioned percentage by weight, APEO, polycondensation naphthalene sulfonate, Fluhyzon hydrochlorate, isooctanol is added to the water, wet process disintegrator grinds 1 hour, add xanthans, dimethicone, ethylene glycol again, the water of Sodium Benzoate and surplus stirs rear corase grind and proceed to sand mill extra-fine grinding after 10 micron, makes particle diameter reach 2-3 micron both obtained finished products.Period, strict controlled working temperature was no more than 50 DEG C.

Acrylic acid copolymer-maleic anhydride and APEO are surfactants, and effect forms oil-in-water anion at former medicine particle surface, reduces cohesion; Polycondensation naphthalene sulfonate is dispersant, and Fluhyzon hydrochlorate is wetting agent, ensures particle stabilizedly to be distributed in colloidal suspension agent; Xanthans is thickener, and isooctanol is stabilizing agent, and dimethicone is defoamer, and ethylene glycol is antifreezing agent, and Sodium Benzoate is preservative.These auxiliary agents act synergistically, and ensure that suspending agent is stablized.

Pendimethalin suspension product provided by the invention with the pendimethalin of about 40% content for functional component, choose the surfactant of acrylic acid copolymer-maleic anhydride, APEO two kinds of material assembly, and dispersant polycondensation naphthalene sulfonate, wetting agent Fluhyzon hydrochlorate, through reasonable assembly, reach stronger suspension wettability effect, then be equipped with the auxiliary agents such as xanthans, isooctanol stabilizing agent, dimethicone defoamer, ethylene glycol, Sodium Benzoate preservative.These grade of component synergy, suspensibility is high, good stability to cause product of the present invention to have, applied widely, high-efficiency low-toxicity, safety and environmental protection, feature with low cost.Particularly this product take water as carrier, and substituting organic solvent, is the environment protection water-based agent type that country advocates.

This Product checking index can reach following standard: suspensibility >=90%, screen analysis >=99%, topples over rear residue≤3.0%, residue≤0.5% after washing, persistent foamability≤25ml.

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

Four, embodiment

Embodiment 1: each component of the present invention and heavy percentage thereof are configured to: 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 process of preparing is: will meet pendimethalin, the acrylic acid copolymer-maleic anhydride of above-mentioned percentage by weight, APEO, polycondensation naphthalene sulfonate, Fluhyzon hydrochlorate, isooctanol is added to the water, wet process disintegrator grinds 1 hour, add xanthans, dimethicone, ethylene glycol again, the water of Sodium Benzoate and surplus stirs rear corase grind and proceed to sand mill extra-fine grinding after 10 micron, makes particle diameter reach 2-3 micron both obtained finished products.Period, strict controlled working temperature was no more than 50 DEG C.Except pendimethalin, other raw material is food-grade.

The product small plot experiment in 2010 of the present embodiment, 40% pendimethalin suspension amount of application is respectively 120ml/ mu, 150ml/ mu, 180ml/ mu, 200ml/ mu four gradients, and with 33% pendimethalin missible oil of consumption, the trefanocide of conventional amount used carries out herbicidal effect contrast.Cotton broadcasts front closed soil treatment, planting after plastic covered.When 30 days, 50 days, the preventive effect of local four kinds of main weed in cotton field barnyard grasses, oak-leaved goosefeet, kitchen garden, field bindweed is investigated after carrying out medication respectively.Actual observation this product is suitable at corresponding 33% pendimethalin missible oil 150ML, 180ML, 220ML preventing weeding weeds effect of every mu of 120ML, 150ML, 180ML, and also namely mu consumption is less than 33% pendimethalin missible oil.Each process all has inhibitory action to field bindweed and control efficiency is close.The integrated control effect of 40% pendimethalin suspension and 33% pendimethalin missible oil is all better than trefanocide.The preventive effect of the present embodiment product to oak-leaved goosefeet and barnyard grass increases along with the increase of dosage.And when the dosage of pendimethalin, after 150-200ml/ mu, it is remarkable to control of weeds difference on effect, thus proves that 150ml/ mu is the better using dosage of this product.

Because the present embodiment product is carrier with water, cost of material is low, and its unit cost of production is lower than 33% missible oil by about 10%.In addition this product relative usage is few, and therefore use cost is lower than 33% missible oil by about 15%.

Embodiment 2: each component of the present invention and heavy percentage thereof are configured to: 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 process of preparing is with embodiment 1.

The product 2010 of embodiment 2 enters center, sub-reclamation area at the sand of Aksu, Xinjiang and observes and predicts station and carry out land for growing field crops application test.This product three usage amount gradients are 100ml/ mu respectively, 150ml/ mu, 200ml/ mu, contrast as the logical missible oil (33% pendimethalin missible oil) of 120ml/ mu dish grass.Broadcast front closed soil treatment.Emergence rate, weed control efficacy, output of cotton are investigated.Result of the test shows, emerges without impact when this product low dosage uses on cotton.In weed control, effective all than contrast medicament of this product three consumptions is especially higher to cotton field conventional weeds barnyard grass, oak-leaved goosefeet preventive effect.From output of cotton, this product three process is all high than 33% pendimethalin missible oil.

Claims (2)

1. a pendimethalin suspension, containing compositions such as surfactant, wetting dispersing agent, stabilizing agent, thickener, defoamer, antifreezing agents, it is characterized in that the component of this suspending agent is formed 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.

2. suspending agent as claimed in claim 1, it is characterized in that the component of this suspending agent is formed and weight percent content 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.