CN103833471B - Mid-late ripening corn special environment protection degradable granule fertilizer coating liquid and preparation method thereof - Google Patents
Mid-late ripening corn special environment protection degradable granule fertilizer coating liquid and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a kind of Mid-late ripening corn special environment protection degradable granule fertilizer coating liquid and preparation method thereof, it belongs to slowly/controlled releasing fertilizer technical field.The degradable granulated fertilizer coating liquid of Mid-late ripening corn special environment protection, it is prepared from by described mass fraction by following raw material: 1 ~ 3 part, gelatin, W-Gum 3 ~ 10 parts, carboxymethyl cellulose 4 ~ 10 parts, polyvinyl alcohol 2 ~ 8 parts, methyl methacrylate 1 ~ 5 part, butyl acrylate 7.6 ~ 9.3 parts, 0.3 part, vinylformic acid, emulsifier op-10 0.3 part, sodium laurylsulfonate 0.3 part, pigment and base-material 6 ~ 8 parts, Dyhard RU 100 0.5 part, polyacrylamide 0.3 ~ 1 part, 0.5 part, Sulfothiorine, ammonium persulphate 0.3 part, 133 parts, water.Raw material sources of the present invention is extensive, and with low cost, production process is without the need to organic solvent, and after imposing on soil, nutrient controlled-release effect is good, can not cause secondary pollution in soil.
Description
Technical field
The invention belongs to slowly/controlled releasing fertilizer technical field, particularly relate to Mid-late ripening corn special environment protection degradable granule fertilizer coating liquid utilizing cheap natural macromolecular material and polymer emulsion to prepare and preparation method thereof, it is a kind of water base coating liquid.
Background technology
China's population is now more than 1,400,000,000, extremely huge to the demand of grain.For ensureing grain yield, guarantee national food security, China's chemical fertilizer consumption amount the first in the world, and China's fertilizer this season utilization ratio, nitrogenous fertilizer average out to 35 ~ 50%, phosphate fertilizer is 20 ~ 25%, and potash fertilizer is 50 ~ 60%, all far below developed country.Utilization rate of fertilizer is low, not only causes the loss of macronutrient, and brings huge financial loss, also can cause the environmental problem that Greenhouse effect, eutrophication etc. are serious simultaneously.Therefore, improve chemical fertilizer utilization ratio, reduce chemical fertilizer loss, reducing carrying capacity of environment, is current problem demanding prompt solution.Film-coated controlled release fertilizer effectively can improve utilization rate of fertilizer, reduces fertilizer loss, has become the important approach that current solution chemical fertilizer utilization ratio is on the low side.
Film-coated controlled release fertilizer take granulated fertilizer as core, and the inorganics of surface-coated one deck indissoluble or organic substance make the nutrient slow releasing in chemical fertilizer, can extend or control fertilizer nutrient release, and fertilizer nutrient is discharged needs fertilizer basically identical with crop.Such as Japanese Patent (1279683) discloses a kind of granulated fertilizer coating and method for making thereof, and its coated fertilizer is made up of with vinyl acetate copolymer and talcum powder polyolefine or ethene.But at present organic polymer price is high, in production process use volatility and higher toluene, dimethylbenzene, the turpentine wet goods organic solvent of toxicity, and a lot of polymer organic polymer enters soil and is difficult to degraded, can cause secondary pollution more.Therefore, the filmcoated controlled release fertilizer cost ratio common fertilizer that employing organic polymer carries out coating production is high 2 ~ 8 times, is difficult to large scale application.
The early, middle and late ripe kind of corn dividing.Early maturing variety: sow in spring 80 ~ 100 days, summer sowing 70 ~ 85 days, breeding time is short, and yield potential is less; Medium variety: sow in spring 100 ~ 120 days, summer sowing 85 ~ 95 days; The ripe kind of Dinner: sow in spring 120 ~ 150 days, summer sowing more than 96 days, breeding time is long, and yield potential is large.Corn is maximum to the requirement of nitrogen, potassium, the phosphorus of absorption than nitrogen and potassium all few.Utilization ratio due to potassium is the highest (50 ~ 60%), nitrogen takes second place (35 ~ 50%), and the utilization ratio of phosphorus minimum (20 ~ 25%), fertilising is answered emphasis mend nitrogen, appropriate supplement phosphorus, mend potassium, the nitrogen that corn is suitable for, phosphorus, potassium applicating ratio are roughly 1:0.4 ~ 0.6:0.3 ~ 0.5 and are advisable, the composite fertilizer of normal disposable employed 28-12-10,30-10-10 equal proportion, or use 15-15-15 composite fertilizer and coordinate urea to topdress supplementary nitrogen.Therefore, the sustained-controll-release fertiliser fertilizer efficiency period that corn is special generally can not exceed corn growth stage.Or rather, Mid-late ripening emergence of corn, to about about 60 days typhon mouth phase, is at this moment that corn npk nutrient absorbs peak, absorbs nutrient maximum, the soonest, reduce rapidly afterwards, stopping of nourishing and growing to flowering period.The fertilizer releasing period of the special sustained-controll-release fertiliser of corn should be consistent with nutrient rule needed for corn growth, should discharge maximum nutrient mouth phase to flowering period at corn typhon.So the fertilizer releasing period of the special slowly/controlled releasing fertilizer of Mid-late ripening corn once applied as base fertilizer should be advisable at about 60 ~ 90 days.
The water-soluble natural macromolecular compounds such as starch, Mierocrystalline cellulose, gelatin all can be used as the coated fertilizer of fertilizer, and source is wide, and price is low, and film-forming properties is better, and preparation technology is simple, is very suitable for scale operation and large scale application.But these natural water-soluble polymer coatings also exist important defect, though as adopted the fertilizer rate of release of these natural polymer coatings to slow down than common fertilizer release, because water tolerance is poor, the effect better controlling fertilizer nutrient release can't be reached.Therefore, the water-soluble of coating must be improved by modification, just can reach the controlled-release effect of expection.The inorganics of insoluble is as iron oxide red, and carbon black, titanium dioxide, wilkinite, stone flour, whiting, terra alba etc., source is wide, and low price, is applicable to use of large-scale production.Acrylic resin is the good polymer organic polymer of water tolerance comparing environmental protection, not only as the main raw material of coatings industry, can also be usually used in the coated fertilizer of medical casing sheet etc.Therefore, adopt the inorganics of insoluble and acrylic resin to carry out modification to water-soluble polymer, significantly can reduce production cost, and effectively can improve the controlled-release effect of fertilizer, for active effect is played in the large scale application of coated fertilizer.
Summary of the invention
Technical problem to be solved by this invention is to provide degradable granulated fertilizer coating liquid of a kind of Mid-late ripening corn special environment protection and preparation method thereof, it utilizes starch, Mierocrystalline cellulose, gelatin, the cohesiveness of polyvinyl alcohol etc. and film-forming properties, add pigment and inert inorganic filler, water tolerance is increased by polyacrylate dispersion, with this production coated granular fertilizer of filling a prescription, raw material sources is extensive, with low cost, production process is without the need to organic solvent, after imposing on soil, nutrient controlled-release effect is good, its nutrients release and Mid-late ripening corn law of nutritive absorption basically identical, and coated fertilizer is easily degraded, secondary pollution can not be caused in soil.
In order to solve the problems of the technologies described above, the present invention is achieved through the following technical solutions:
The degradable granulated fertilizer coating liquid of Mid-late ripening corn special environment protection, it is prepared from by described mass fraction by following raw material: gelatin 1 ~ 3 mass parts, W-Gum 3 ~ 10 mass parts, carboxymethyl cellulose (CMC) 4 ~ 10 mass parts, polyvinyl alcohol 2 ~ 8 mass parts, methyl methacrylate 1 ~ 5 mass parts, butyl acrylate 7.6 ~ 9.3 mass parts, vinylformic acid 0.3 mass parts or vinylbenzene 7.3 mass parts, emulsifier op-10 0.3 mass parts, sodium laurylsulfonate 0.3 mass parts, pigment and base-material 6 ~ 8 mass parts, N-NBPT (NBPT) or Dyhard RU 100 (DCD) 0.5 mass parts, polyacrylamide (PAM) 0.3 ~ 1 mass parts, Sulfothiorine 0.5 mass parts, ammonium persulphate 0.3 mass parts, water 133 mass parts.
The polymerization degree of above-mentioned polyvinyl alcohol is 1700, and saponification deg is 98%.
Above-mentioned pigment and base-material are several mixtures in iron oxide red, carbon black, titanium dioxide, wilkinite, talcum powder, whiting and terra alba.
The preparation method of the degradable granulated fertilizer coating liquid of above-mentioned Mid-late ripening corn special environment protection:
(1) 100 mass parts water are heated to 90 ~ 100 DEG C for subsequent use, get gelatin 1 ~ 3 mass parts respectively, W-Gum 3 ~ 10 mass parts, carboxymethyl cellulose (CMC) 4 ~ 10 mass parts, polyvinyl alcohol (PVA) 2 ~ 8 mass parts, sodium laurylsulfonate 0.3 mass parts, N-NBPT (NBPT) or Dyhard RU 100 (DCD) 0.5 mass parts, polyacrylamide (PAM) 0.3 ~ 1 mass parts, Sulfothiorine 0.5 mass parts, join in the water heated item by item, after stirring and dissolving, then add lower a kind of component; Finally regulate potential of hydrogen between PH6.5 ~ 7.5 with 10% sodium hydroxide or sulfuric acid, then fully stir, make suspension I for subsequent use;
(2) then, the 80-120 object pigment of 6 ~ 8 mass parts and base-material are joined in above-mentioned suspension I, constantly stir 0.5 ~ 2 hour, after three-roll grinder grinding, cross 80 mesh sieves, removing larger particles, makes suspension II for subsequent use;
(3) 30 mass parts water are added in a kettle., add 0.3 mass parts emulsifier op-10, heating, continuous stirring, treat that temperature is elevated to 75 DEG C, by methyl methacrylate 1 ~ 5 mass parts, butyl acrylate 7.6 ~ 9.3 mass parts, vinylformic acid 0.3 mass parts or vinylbenzene 7.3 mass parts join in reactor, abundant mixing, then drop to gradually in reactor after the ammonium persulphate of 0.3 mass parts and 3 mass parts water are mixed, initiated polymerization, after having reacted, be incubated 0.5 hour obtained polymer emulsion III;
(4) above-mentioned suspension II and polymer emulsion III is fully mixed, make environment-friendly degradable granulated fertilizer coating liquid.
The coating process of the environment-friendly degradable granulated fertilizer coating liquid in the present invention can adopt common process, also rotary drum coating process can be adopted to carry out coating, for rotary drum coating process, coating rotary drum length-to-diameter ratio is 5 ~ 10, and coating and drying course carry out in same rotary drum; Start rotary drum granulator, granulated fertilizer enters rotary drum, is blown into hot-air pre-heating fertilizer, end flue temperature 150 ~ 300 DEG C; Coating liquid in storage tank is preheated to 70 ~ 85 DEG C simultaneously, and is constantly stirred by coating liquid, coating liquid is sprayed at granulated fertilizer surface, atomizing pressure 4kpa, straying quatity is 5 ~ 15% of core particle fertilizer; Abundant drying, moisture in removing rete; Sieve after discharging, weigh, pack.
Owing to adopting technique scheme, degradable granule fertilizer coating liquid tool of the present invention is had the following advantages and effect:
(1) the water-soluble natural macromolecular compound such as gelatin, starch, carboxymethyl cellulose in coating formula, source is wide, and cost is low, and film-forming properties is better; Granulated fertilizer nutrients release and the Mid-late ripening corn law of nutritive absorption of coating are basically identical; Film material is also easy in degraded in soil, can not cause secondary pollution.
(2) the N-NBPT (NBPT) in coating liquid formula and Dyhard RU 100 (DCD) are the good urease inhibitor of effect and nitrification inhibitor commonly used now respectively, the former can delay Urea Transformation is ammonium nitrogen, and the latter can delay soil ammonium is converted into nitric nitrogen, thus prevent the leaching loss of nitrogen.
(3) coating liquid preparation technology is simple, and coating liquid is applicable to the coating process such as coating pan, disk, rotary drum and fluidized-bed; Be very suitable for scale operation and large scale application.
(4) inorganics of insoluble in coating liquid formula as iron oxide red, carbon black, titanium dioxide, wilkinite, stone flour, whiting, terra alba etc., source is wide, and low price, both can be used as pigment, made white, black and red coating liquid respectively; These components also can be used as the inertia base material of coating liquid, and are non-heavy metal class mineral dyes, pollution-free.
(5) acrylic resin in coating liquid formula not only can as the main raw material of coatings industry, and being also usually used in the coated fertilizer of medical casing sheet etc., is the good polymer organic polymer of water tolerance of very environmental protection.
(6) the environment-friendly degradable granulated fertilizer coating liquid in the present invention is made up of 2 kinds of suspensions, according to differing materials proportioning, more flexibly, can produce the coated fertilizer of different release period easily.
(7) adopt the coating liquid in the present invention, not only can produce coated carbamide, all right coated granule composite fertilizer, potion is multiplex; The part by weight of coated fertilizer and core fertilizer is 5 ~ 15:100, and fertilizer coating material cost per ton is about 180 ~ 320 yuan, and cost is low.
(8), after being manured into soil with the release and release control fertilizer of coating liquid coating of the present invention, the Nitrogen releasing phase of coated fertilizer is about 57 ~ 92 days, nutrients release and Mid-late ripening corn law of nutritive absorption basically identical.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail.Following examples are only several specific embodiment of the present invention, but design concept of the present invention is not limited thereto, and all changes utilizing this design the present invention to be carried out to unsubstantiality, all should belong to the behavior of invading scope.
Method in following embodiment, if no special instructions, is ordinary method.
Percentage composition (%) in following embodiment if no special instructions, is mass percentage.
the red coating granular urea of embodiment 1.
(1) 100kg water is heated to 90 DEG C, get gelatin 2kg respectively, W-Gum 3kg, carboxymethyl cellulose (CMC) 10kg, polyvinyl alcohol (PVA) 8kg, sodium laurylsulfonate 0.3kg, N-NBPT (NBPT) 0.5kg, polyacrylamide (PAM) 0.3kg, Sulfothiorine 0.5kg, join in the water heated item by item, after stirring and dissolving, then add lower a kind of component; Finally regulate potential of hydrogen pH value to be 7.5 with 10% sodium hydroxide or sulfuric acid, then fully stir, make suspension I;
(2) then, by 80-120 object 5kg iron oxide red, 2kg talcum powder, 1kg terra alba joins in above-mentioned suspension I, constantly stirs 1.2 hours, after three-roll grinder grinding, cross 80 mesh sieves, and removing larger particles, makes suspension II for subsequent use;
(3) add 30 kg water in a kettle., add 0.3kg emulsifier op-10, heating, continuous stirring, treat that temperature is elevated to 75 DEG C, by methyl methacrylate 5kg, butyl acrylate 9.3kg, vinylformic acid 0.3kg joins reactor, abundant mixing, then drop to gradually in reactor after the ammonium persulphate of 0.3kg and 3kg water are mixed, initiated polymerization, after having reacted, be incubated 0.5 hour obtained polymer emulsion III;
(4) suspension II and above-mentioned polymer emulsion III is fully mixed, make environment-friendly degradable granulated fertilizer coating liquid.
The coating process of the environment-friendly degradable coating granular urea in the present invention:
For rotary drum coating process: coating rotary drum length-to-diameter ratio is 5 ~ 10, coating and drying course carry out in same rotary drum; Start rotary drum granulator, granular urea enters rotary drum, is blown into hot-air pre-heating, end flue temperature 150 ~ 300 DEG C; Coating liquid in storage tank is preheated to 70 ~ 85 DEG C simultaneously, and is constantly stirred by coating liquid, coating liquid is sprayed at granular urea surface, atomizing pressure 4kpa, straying quatity is 5 ~ 15% of core urea; Abundant drying, moisture in removing rete; Sieve after discharging; If prolongation release period, secondary coating can also be carried out.
embodiment 2. black coating granular urea
(1) 100kg water is heated to 95 DEG C, by weight getting gelatin 1kg respectively, W-Gum 10kg, carboxymethyl cellulose (CMC) 7kg, polyvinyl alcohol (PVA) 3kg, sodium laurylsulfonate 0.3kg, Dyhard RU 100 (DCD) 0.5kg, polyacrylamide (PAM) 1kg, Sulfothiorine 0.5kg, add item by item, after stirring and dissolving, then add lower a kind of component; Finally regulate potential of hydrogen pH value to be 6.5 with 10% sodium hydroxide or sulfuric acid, then fully stir, make suspension I;
(2) then, by 80 ~ 120 object 3kg carbon blacks, 3kg wilkinite, 1kg terra alba joins in above-mentioned suspension I, constantly stirs 0.8 hour, after three-roll grinder grinding, cross 80 mesh sieves, and removing larger particles, makes suspension II for subsequent use;
(3) add 30 kg water in a kettle., add 0.3kg emulsifier op-10, heating, continuous stirring, treat that temperature is elevated to 75 DEG C, by methyl methacrylate 1kg, butyl acrylate 7.6kg, vinylbenzene 7.3kg joins reactor, abundant mixing, then drop to gradually in reactor after the ammonium persulphate of 0.3kg and 3kg water are mixed, initiated polymerization, after having reacted, be incubated 0.5 hour obtained polymer emulsion III; (4) suspension II and above-mentioned polymer emulsion III is fully mixed, make environment-friendly degradable granulated fertilizer coating liquid.
The coating process of the environment-friendly degradable coating granular urea in the present invention:
For rotary drum coating process.Coating rotary drum length-to-diameter ratio is 5 ~ 10, and coating and drying course carry out in same rotary drum; Start rotary drum granulator, granular urea enters rotary drum, is blown into hot-air pre-heating, end flue temperature 150 ~ 300 DEG C; Coating liquid in storage tank is preheated to 70 ~ 85 DEG C simultaneously, and is constantly stirred by coating liquid, coating liquid is sprayed at granular urea surface, atomizing pressure 4kpa, straying quatity is 5 ~ 15% of core urea; Abundant drying, moisture in removing rete; Sieve after discharging; If prolongation release period, secondary coating can also be carried out.
the white coating granular urea of embodiment 3.
(1) 100kg water is heated to 100 DEG C, by weight getting gelatin 3kg respectively, W-Gum 6kg, carboxymethyl cellulose (CMC) 9kg, polyvinyl alcohol (PVA) 7kg, sodium laurylsulfonate 0.3kg, Dyhard RU 100 (DCD) 0.5kg, polyacrylamide (PAM) 0.5kg, Sulfothiorine 0.5kg, add item by item, after stirring and dissolving, then add lower a kind of component; Finally regulate potential of hydrogen pH value to be 6.8 with 10% sodium hydroxide or sulfuric acid, then fully stir, make suspension I; The polymerization degree of described polyvinyl alcohol is 1700, and saponification deg is 98%;
(2) then, by 80-120 object 1kg titanium dioxide, 2kg terra alba, the talcum powder of 2kg, the whiting of 1kg joins in above-mentioned suspension I, constantly stirs 1 hour, after three-roll grinder grinding, cross 80 mesh sieves, and removing larger particles, makes suspension II for subsequent use;
(3) add 30 kg water in a kettle., add 0.3kg emulsifier op-10, heating, continuous stirring, treat that temperature is elevated to 75 DEG C, by methyl methacrylate 1kg, butyl acrylate 9.3kg, vinylformic acid 0.3kg joins reactor, abundant mixing, then drop to gradually in reactor after the ammonium persulphate of 0.3kg and 3kg water are mixed, initiated polymerization, after having reacted, be incubated 0.5 hour obtained polymer emulsion III; (4) suspension II and above-mentioned polymer emulsion III is fully mixed, make environment-friendly degradable granular urea coating liquid.
The coating process of the environment-friendly degradable coating granular urea in the present invention:
For rotary drum coating process.Coating rotary drum length-to-diameter ratio is 5 ~ 10, and coating and drying course carry out in same rotary drum; Start rotary drum granulator, granular urea enters rotary drum, is blown into hot-air pre-heating, end flue temperature 150 ~ 300 DEG C; Coating liquid in storage tank is preheated to 70 ~ 85 DEG C simultaneously, and is constantly stirred by coating liquid, coating liquid is sprayed at granular urea surface, atomizing pressure 4kpa, straying quatity is 5 ~ 15% of core urea; Abundant drying, moisture in removing rete; Sieve after discharging; If prolongation release period, secondary coating can also be carried out.
embodiment 4. black coated granule Chemical Mixed Fertilizer
(1) 100kg water is heated to 96 DEG C, by weight getting gelatin 1.5kg respectively, W-Gum 8kg, carboxymethyl cellulose (CMC) 5kg, polyvinyl alcohol (PVA) 2kg, sodium laurylsulfonate 0.3kg, N-NBPT (NBPT) 0.5kg, polyacrylamide (PAM) 0.8kg, Sulfothiorine 0.5kg, add item by item, after stirring and dissolving, then add lower a kind of component; Finally regulate potential of hydrogen pH value to be 7.2 with 10% sodium hydroxide or sulfuric acid, then fully stir, make suspension I;
(2) then, by 80-120 object 3kg carbon black, 3kg wilkinite, 1kg terra alba joins in above-mentioned suspension I, constantly stirs 1.5 hours, after three-roll grinder grinding, cross 80 mesh sieves, and removing larger particles, makes suspension II for subsequent use;
(3) add 30 kg water in a kettle., add 0.3kg emulsifier op-10, heating, continuous stirring, treat that temperature is elevated to 75 DEG C, by methyl methacrylate 5kg, butyl acrylate 7.6kg, vinylbenzene 7.3kg joins reactor, abundant mixing, then drop to gradually in reactor after the ammonium persulphate of 0.3kg and 3kg water are mixed, initiated polymerization, after having reacted, be incubated 0.5 hour obtained polymer emulsion III;
(4) suspension II and above-mentioned polymer emulsion III is fully mixed, make environment-friendly degradable granulated fertilizer coating liquid.
The coating process of the environment-friendly degradable coated granule Chemical Mixed Fertilizer in the present invention:
For rotary drum coating process.Coating rotary drum length-to-diameter ratio is 5 ~ 10, and coating and drying course carry out in same rotary drum; Start rotary drum granulator, compounded fertilizer of granulated enters rotary drum, is blown into hot-air pre-heating, end flue temperature 150 ~ 300 DEG C; Coating liquid in storage tank is preheated to 70 ~ 85 DEG C simultaneously, and is constantly stirred by coating liquid, coating liquid is sprayed at compounded fertilizer of granulated surface, atomizing pressure 4kpa, straying quatity is 5 ~ 15% of core urea; Abundant drying, moisture in removing rete; Sieve after discharging; If prolongation release period, secondary coating can also be carried out.
the red coated granule Chemical Mixed Fertilizer of embodiment 5.
(1) 100kg water is heated to 92 DEG C, get gelatin 2.5kg respectively, W-Gum 6kg, carboxymethyl cellulose (CMC) 6kg, polyvinyl alcohol (PVA) 3kg, sodium laurylsulfonate 0.3kg, Dyhard RU 100 (DCD) 0.5kg, polyacrylamide (PAM) 0.6kg, Sulfothiorine 0.5kg, add item by item, after stirring and dissolving, then add lower a kind of component; Finally regulate potential of hydrogen pH value to be 6.7 with 10% sodium hydroxide or sulfuric acid, then fully stir, make suspension I; The polymerization degree of described polyvinyl alcohol is 1700, and saponification deg is 98%;
(2) then, by 80-120 object 4kg iron oxide red, 1kg talcum powder, 2kg terra alba, 1kg whiting joins in above-mentioned suspension I, constantly stirs 2 hours, after three-roll grinder grinding, cross 80 mesh sieves, and removing larger particles, makes suspension II for subsequent use;
(3) add 30 kg water in a kettle., add 0.3kg emulsifier op-10, heating, continuous stirring, treat that temperature is elevated to 75 DEG C, by methyl methacrylate 3kg, butyl acrylate 8kg, vinylformic acid 0.3kg joins reactor, abundant mixing, then drop to gradually in reactor after the ammonium persulphate of 0.3kg and 3kg water are mixed, initiated polymerization, after having reacted, be incubated 0.5 hour obtained polymer emulsion III;
(4) suspension II and above-mentioned polymer emulsion III is fully mixed, make environment-friendly degradable granulated fertilizer coating liquid.
The coating process of the environment-friendly degradable coated granule Chemical Mixed Fertilizer in the present invention:
For rotary drum coating process.Coating rotary drum length-to-diameter ratio is 5 ~ 10, and coating and drying course carry out in same rotary drum; Start rotary drum granulator, compounded fertilizer of granulated enters rotary drum, is blown into hot-air pre-heating, end flue temperature 150 ~ 300 DEG C; Coating liquid in storage tank is preheated to 70 ~ 85 DEG C simultaneously, and is constantly stirred by coating liquid, coating liquid is sprayed at compounded fertilizer of granulated surface, atomizing pressure 4kpa, straying quatity is 5 ~ 15% of core Chemical Mixed Fertilizer; Abundant drying, moisture in removing rete; Sieve after discharging; If prolongation release period, secondary coating can also be carried out.
the white coating of embodiment 6. Chemical Mixed Fertilizer
(1) 100kg water is heated to 97 DEG C, by weight getting gelatin 2.2kg respectively, W-Gum 9kg, carboxymethyl cellulose (CMC) 4kg, polyvinyl alcohol (PVA) 4kg, sodium laurylsulfonate 0.3kg, N-NBPT (NBPT) 0.5kg, polyacrylamide (PAM) 0.9kg, Sulfothiorine 0.5kg, add item by item, after stirring and dissolving, then add lower a kind of component; Finally regulate potential of hydrogen pH value to be 7 with 10% sodium hydroxide or sulfuric acid, then fully stir, make suspension I;
(2) then, by 80-120 object 2kg titanium dioxide, 2kg wilkinite, the talcum powder of 1kg, the whiting of 2kg joins in above-mentioned suspension I, constantly stirs 0.5 hour, after three-roll grinder grinding, cross 80 mesh sieves, removing larger particles, makes suspension II for subsequent use;
(3) add 30 kg water in a kettle., add 0.3kg emulsifier op-10, heating, continuous stirring, treat that temperature is elevated to 75 DEG C, by methyl methacrylate 2kg, butyl acrylate 8.3kg, vinylformic acid 0.3kg joins reactor, abundant mixing, then drop to gradually in reactor after the ammonium persulphate of 0.3kg and 3kg water are mixed, initiated polymerization, after having reacted, be incubated 0.5 hour obtained polymer emulsion III;
(4) suspension II and above-mentioned polymer emulsion III is fully mixed, make environment-friendly degradable granular urea coating liquid.
The coating process of the environment-friendly degradable coating granular urea in the present invention:
For rotary drum coating process.Coating rotary drum length-to-diameter ratio is 5 ~ 10, and coating and drying course carry out in same rotary drum; Start rotary drum granulator, granular urea enters rotary drum, is blown into hot-air pre-heating, end flue temperature 150 ~ 300 DEG C; Coating liquid in storage tank is preheated to 70 ~ 85 DEG C simultaneously, and is constantly stirred by coating liquid, coating liquid is sprayed at granular urea surface, atomizing pressure 4kpa, straying quatity is 5 ~ 15% of core urea; Abundant drying, moisture in removing rete; Sieve after discharging; If prolongation release period, secondary coating can also be carried out.
Controlled Release Fertilizer of the present invention meets the slow release fertilizer GB/T23348-2009 national standard playing enforcement on September 1st, 2009 and the release and release control fertilizer HG/T 4215-2011 Industry code requirements implemented on July 1st, 2012.
Controlled Release Fertilizer nutrient release rate adopts hydrostatic stripping method, that is: take 10.00g fertilizer sample, put into and seal with 100 order finger-type nylon net bags, immersed in 250ml separating funnel, then adding distil water 250ml, sealing is placed in the constant incubator of 25 DEG C, repeat, do blank simultaneously for 3 times; Respectively in 1d, 7d, 14d, 28d, 42d, 56d, 84d sampling and measuring, until nutrients accumulation release rate reaches 80% or more than 80%.
Result adopts the granulated fertilizer Nitrogen releasing phase of coating liquid coating of the present invention to be respectively 57 ~ 92 days, in table 1.
The table 1 Mid-late ripening corn special environment protection degradable coated granular fertilizer Nitrogen releasing phase
Coating process in above-described embodiment 1-6 is rotary drum coating process, also can adopt other common process, and this can not be used for limiting protection scope of the present invention.
Claims (3)
1. the degradable granulated fertilizer coating liquid of Mid-late ripening corn special environment protection, it is characterized in that it is prepared from by described mass fraction by following raw material: gelatin 1 ~ 3 mass parts, W-Gum 3 ~ 10 mass parts, carboxymethyl cellulose 4 ~ 10 mass parts, polyvinyl alcohol 2 ~ 8 mass parts, methyl methacrylate 1 ~ 5 mass parts, butyl acrylate 7.6 ~ 9.3 mass parts, vinylformic acid 0.3 mass parts or vinylbenzene 7.3 mass parts, emulsifier op-10 0.3 mass parts, sodium laurylsulfonate 0.3 mass parts, pigment and base-material 6 ~ 8 mass parts, N-NBPT or Dyhard RU 100 0.5 mass parts, polyacrylamide 0.3 ~ 1 mass parts, Sulfothiorine 0.5 mass parts, ammonium persulphate 0.3 mass parts, water 133 mass parts,
(1) 100 mass parts water are heated to 90 ~ 100 DEG C for subsequent use, get gelatin 1 ~ 3 mass parts respectively, W-Gum 3 ~ 10 mass parts, carboxymethyl cellulose 4 ~ 10 mass parts, polyvinyl alcohol 2 ~ 8 mass parts, sodium laurylsulfonate 0.3 mass parts, N-NBPT or Dyhard RU 100 0.5 mass parts, polyacrylamide 0.3 ~ 1 mass parts, Sulfothiorine 0.5 mass parts, join in the water heated item by item, after stirring and dissolving, then add lower a kind of component; Finally regulate potential of hydrogen between pH6.5 ~ 7.5 with 10% sodium hydroxide or sulfuric acid, then fully stir, make suspension I for subsequent use;
(2) then, the 80-120 object pigment of 6 ~ 8 mass parts and base-material are joined in above-mentioned suspension I, constantly stir 0.5 ~ 2 hour, after three-roll grinder grinding, cross 80 mesh sieves, removing larger particles, makes suspension II for subsequent use;
(3) 30 mass parts water are added in a kettle., add 0.3 mass parts emulsifier op-10, heating, continuous stirring, treat that temperature is elevated to 75 DEG C, by methyl methacrylate 1 ~ 5 mass parts, butyl acrylate 7.6 ~ 9.3 mass parts, vinylformic acid 0.3 mass parts or vinylbenzene 7.3 mass parts join in reactor, abundant mixing, then drop to gradually in reactor after the ammonium persulphate of 0.3 mass parts and 3 mass parts water are mixed, initiated polymerization, after having reacted, be incubated 0.5 hour obtained polymer emulsion III for subsequent use;
(4) suspension II and above-mentioned polymer emulsion III is fully mixed, make environment-friendly degradable granulated fertilizer coating liquid.
2. the degradable granulated fertilizer coating liquid of Mid-late ripening corn special environment protection according to claim 1, it is characterized in that the polymerization degree of described polyvinyl alcohol is 1700, saponification deg is 98%.
3. the degradable granulated fertilizer coating liquid of Mid-late ripening corn special environment protection according to claim 1, is characterized in that described pigment and base-material are several mixtures in iron oxide red, carbon black, titanium dioxide, wilkinite, talcum powder, whiting and terra alba.
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| US9834487B2 (en) | 2015-07-13 | 2017-12-05 | Koch Agronomic Services, Llc | Highly concentrated phosphoric or thiophosphoric triamide formulation |
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| CN104355827A (en) * | 2014-11-05 | 2015-02-18 | 青岛锐志农业技术服务有限公司 | Slowly-soluble type bio-organic chemical fertilizer and preparation method thereof |
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| CN109503269A (en) * | 2018-12-29 | 2019-03-22 | 成都云图控股股份有限公司 | A kind of coated slow-release material and preparation method thereof and film-coated and slow release fertilizer as made from it |
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