CN103833454A - Green modified urea formaldehyde resin controlled-release coated fertilizer - Google Patents
Green modified urea formaldehyde resin controlled-release coated fertilizer Download PDFInfo
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- CN103833454A CN103833454A CN201210476428.4A CN201210476428A CN103833454A CN 103833454 A CN103833454 A CN 103833454A CN 201210476428 A CN201210476428 A CN 201210476428A CN 103833454 A CN103833454 A CN 103833454A
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Abstract
Belonging to the field of agricultural fertilizers and the field of polymer composite materials, the invention relates to a green modified urea formaldehyde resin controlled-release coated fertilizer. A urea formaldehyde resin (UF) coating material adopts weak base-weak acid-weak base, and the base and the acid participating in the chemical reaction adopt PH regulators with fertilizer's functional attributes per se, so that the green modified urea formaldehyde resin controlled-release coated fertilizer can have high N content, high conversion rate, high fertilizer efficiency and no harm to the soil. A high polymer is employed to modify the tensile strength and toughness of the urea formaldehyde resin (UF) coating material, and a cyclic high polymer is employed to modify the water tolerance of the urea formaldehyde resin (UF) coating material.
Description
Technical field
The present invention relates to the slow controlled release coating fertilizer of a kind of green modified urea-formaldehyde resin, belong to agrochemical field and polymer composite field.
Background technology
China is large agricultural country, and the utilization ratio of chemical fertilizer only has 30% left and right.About 30% is converted into greenhouse gases, and other 40% enters soil, causes soil compaction and rivers eutrophication, and ecotope is done great damage.In order to improve chemical fertilizer utilization ratio, just produce taking sulphur coating (SCU) as representative sustained and controlled release chemical fertilizer technology.Coating fertilizer divides three major types substantially according to mould material at present, (1) inorganic coating material, sulphur, phosphoric acid salt and silicate (2) thermosetting resin, urea aldehyde (UF), oxamide and urethane resin (PU) (3) thermoplastic resin, polyethylene, polypropylene, ethylene vinyl acetate (VAE), acrylic resin, polyvinyl acetal, Synolac.Urea aldehyde (UF) advantage is to adjust according to release request the thickness of mould material, and coating process is simple, and cost advantage is obvious, and the mechanicalness of fertilising is good, solvent-free infringement.Mould material urea-formaldehyde resin (UF) itself just belongs to sustained and controlled release chemical fertilizer category.But existing market urea-formaldehyde resin (UF) coated fertilizer adopts weak base-weak acid-weak base technique more, alkali wherein adopts sodium hydroxide (caustic soda) to regulate alkali pH value more, and acid adopts formic acid adjusting to calculate pH value.Due to production technique and metering and operate miss, acid or alkali in urea-formaldehyde resin (UF) coated fertilizer react with metal ion in soil, cause soil compaction.In addition, traditional fragility of urea-formaldehyde resin (UF) coated fertilizer own is large, and seminess easily appears in certain thickness urea-formaldehyde resin (UF) coated fertilizer in solidification process, and the permeability of nutrient is exerted an influence.Tensile strength and the poor toughness of traditional urea-formaldehyde resin (UF) coated fertilizer, right storage, transport and use and have a negative impact.In urea-formaldehyde resin (UF) coated fertilizer, contain a large amount of strong polar groups, water-fast water-based is poor, thereby does not reach slow controlled-release effect.
Summary of the invention
The present invention is directed to the problems referred to above, provide a kind of green modified urea-formaldehyde resin to delay controlled release coating fertilizer.Urea-formaldehyde resin (UF) coated fertilizer adopts weak base-weak acid-weak base, participate in the PH conditioning agent that chemical alkali and sour employing itself have chemical fertilizer functional attributes, this makes the slow high N content of controlled release coating fertilizer of green modified urea-formaldehyde resin and transformation efficiency, high fertilizer efficiency and harmless to soil.The water tolerance of the tensile strength of employing high molecular polymer modified urea-formaldehyde resin (UF) coated fertilizer and toughness, employing ring-like polymer polymer modification urea-formaldehyde resin (UF) coated fertilizer.Slow controlled release coating fertilizer (1) coated fertilizer of the green ring of the present invention modified urea-formaldehyde resin is prepared by following methods: industrial urea 55-60%wt, formaldehyde 32-37%wt, water-proofing agent 1-5%wt, strengthen toughner, 1-3%wt, alkaline PH conditioning agent: appropriate, acid PH conditioning agent: appropriate.(2) the slow controlled release coating fertilizer of green ring modified urea-formaldehyde resin is prepared by following methods: large granular coated special urea 85-90%wt, amendment 5-10%, solidifying agent 5-10%.At special coated equipment, through steam-heated atomizing air, coated fertilizer is in layer wrapped and be coated on hot urea granules, import amendment, solidifying agent, make surface cure.Cooling making.Above-mentioned coated fertilizer is industrial urea.Coating fertilizer urea is special granular urea.Above-mentioned formaldehyde is technical grade formaldehyde, and concentration is 37%
Above-mentioned water-proofing agent preferable methyl water glass, silicone oil, silicone resin, methyl silanol are received, stearate, lipid acid, trimeric cyanamide, the preferred polyvinyl acetate (PVA) of the above-mentioned enhancing toughner of para toluene sulfonamide, VAE, vinylformic acid, polyvinyl alcohol, and alkaline PH conditioning agent is excellent is sodium hydroxide, vulkacit H, ammoniacal liquor, trolamine.The preferred hydrochloric acid of acid PH conditioning agent, oxalic acid, formic acid, ammonium chloride, ammonium sulfate.The preferred water-ground limestone of above-mentioned amendment, light calcium carbonate, diatomite, talcum powder, ash calcium powder, starch, wood powder, the preferred hydrochloric acid of xylogen solidifying agent, oxalic acid, citric acid, phenylformic acid, formic acid, ammonium chloride the present invention makes the slow controlled release coating fertilizer of green ring modified urea-formaldehyde resin and reaches the requirement of European Committee for Standardization (CEN) about controlled release chemical fertilizer: (1), within 24 hours, burst size is less than 15%(2), within 28 days, burst size is no more than 75%(3) at the appointed time burst size be greater than 75% pair of soil and soil property has no adverse effects.
Embodiment
Embodiment 1
(1) coated fertilizer is prepared by following methods: industrial urea 59%wt, and formaldehyde 35%wt, water-proofing agent trimeric cyanamide 5%wt, strengthens toughner PVA, 1%wt, alkaline PH conditioning agent: sodium hydroxide is appropriate, acid PH conditioning agent: formic acid is appropriate.Formaldehyde packs in special reaction equipment, starts to stir, and adds alkaline PH conditioning agent sodium hydroxide, reacts 11 minutes.Add urea and enhancing toughner PVA for the first time, water-proofing agent trimeric cyanamide, stirs and heats up 60 DEG C, and reaction keeps 30 minutes.Add formaldehyde for the second time, keep temperature 60 C, continue reaction 30 minutes, above reaction keeps weakly alkaline.Heat up 90 DEG C, keep 60 minutes at this temperature, in temperature-rise period, acid PH conditioning agent formic acid adjusting pH value is slightly acidic.After above-mentioned reaction finishes, add urea for the second time, react and regulate PH alkalescence in 30 minutes, cooling 40 DEG C obtain modified urea-formaldehyde resin coated fertilizer.(2) the slow controlled release coating fertilizer of green ring modified urea-formaldehyde resin is prepared by following methods: large granular coated special urea 90%wt, diatomite 5%, oxalic acid 5%.In rotary drum encapsulation tool, urea is preheating to 60 DEG C.Dividing adds for 3 times mould material solution in rotary drum.Import amendment, solidifying agent, make surface cure.Cooling making.(1) will make controlled release chemical fertilizer modified urea-formaldehyde resin coated fertilizer and be coated on special glass plate, obtain coating, measure film thickness.(2) determine N method by triumphant formula and measure N solubility rate, sustained and controlled release chemical fertilizer is placed in 25 DEG C of water and soaks respectively 1d, 28d, 60d, 90d takes out sustained and controlled release chemical fertilizer, measures N content in water.Calculate urea burst size, finally obtain slow-release period.Experimental result is in table one
Embodiment 2
(1) coated fertilizer is prepared by following methods: industrial urea 58%wt, and formaldehyde 36%wt, water-proofing agent silicone oil 4%wt, strengthens toughner polyvinyl acetate (PVA), 2%wt, alkaline PH conditioning agent: sodium hydroxide is appropriate, acid PH conditioning agent: formic acid is appropriate.(2) the slow controlled release coating fertilizer of green ring modified urea-formaldehyde resin is prepared by following methods: large granular coated special urea 87%wt, Paris white 3%, ammonium chloride 10%.Preparation technology and experiment detection method are the same.Experimental result is in table two
Embodiment 3
(1) coated fertilizer is prepared by following methods: industrial urea 57%wt, and formaldehyde 37%wt, water-proofing agent silicone resin 3%wt, strengthens toughner VAE emulsion, 3%wt, alkaline PH conditioning agent: sodium hydroxide is appropriate, acid PH conditioning agent: formic acid is appropriate.(2) the slow controlled release coating fertilizer of green ring modified urea-formaldehyde resin is prepared by following methods: large granular coated special urea 84%wt, grey calcium powder 8%, citric acid 8%.Preparation technology and experiment detection method are the same.Experimental result is in table two
Claims (10)
1. the slow controlled release coating fertilizer of green ring modified urea-formaldehyde resin
(1) coated fertilizer is prepared by following methods: industrial urea 55-60%wt, formaldehyde 32-37%wt, water-proofing agent 1-5%wt, strengthen toughner, 1-3%wt, alkalescence PH conditioning agent: appropriate, acid PH conditioning agent: appropriate, (2) the slow controlled release coating fertilizer of green ring modified urea-formaldehyde resin is prepared by following methods: large granular coated special urea 85-90%wt, amendment 5-10%, solidifying agent 5-10%, at special coated equipment, through steam-heated atomizing air, coated fertilizer is in layer wrapped and be coated on hot urea granules, import amendment, solidifying agent, make surface cure, cooling making.
2. require the slow controlled release coating fertilizer of green ring modified urea-formaldehyde resin according to right 1, it is characterized in that: coated fertilizer urea is industrial urea, coating fertilizer urea is special granular urea.
3. require degradable environmentally-friendly type polyurethane sustained and controlled release chemical fertilizer according to right 1, it is characterized in that: described formaldehyde is technical grade formaldehyde, concentration is 37%.
4. require the slow controlled release coating fertilizer of green ring modified urea-formaldehyde resin according to right 1, it is characterized in that: described water-proofing agent preferable methyl water glass, silicone oil, silicone resin, methyl silanol are received, in stearate, lipid acid, trimeric cyanamide, para toluene sulfonamide at least one.
5. require the slow controlled release coating fertilizer of green ring modified urea-formaldehyde resin according to right 1, it is characterized in that: described strong toughner preferably in polyvinyl acetate (PVA), VAE, vinylformic acid, polyvinyl alcohol at least one.
6. require the slow controlled release coating fertilizer of green ring modified urea-formaldehyde resin according to right 1, it is characterized in that: alkaline PH conditioning agent is excellent is at least one in sodium hydroxide, vulkacit H, ammoniacal liquor, trolamine.
7. require the slow controlled release coating fertilizer of green ring modified urea-formaldehyde resin according to right 1, it is characterized in that: in the preferred hydrochloric acid of acid PH conditioning agent, oxalic acid, formic acid, ammonium chloride, ammonium sulfate at least one.
8. require the slow controlled release coating fertilizer of green ring modified urea-formaldehyde resin according to right 1, it is characterized in that: in the preferred water-ground limestone of amendment, light calcium carbonate, diatomite, talcum powder, grey calcium powder, starch, wood powder, xylogen at least one.
9. require the slow controlled release coating fertilizer of green ring modified urea-formaldehyde resin according to right 1, it is characterized in that: in the preferred hydrochloric acid of solidifying agent, oxalic acid, citric acid, phenylformic acid, formic acid, ammonium chloride at least one.
10. require the slow controlled release coating fertilizer of green ring modified urea-formaldehyde resin according to right 1, it is characterized in that: it is made up of the slow controlled release coating fertilizer of any one green ring modified urea-formaldehyde resin of claim 1-9 of urea and green ring modified urea-formaldehyde resin mould material.
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| CN201210476428.4A CN103833454A (en) | 2012-11-22 | 2012-11-22 | Green modified urea formaldehyde resin controlled-release coated fertilizer |
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| CN201210476428.4A CN103833454A (en) | 2012-11-22 | 2012-11-22 | Green modified urea formaldehyde resin controlled-release coated fertilizer |
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| CN104496650A (en) * | 2014-11-28 | 2015-04-08 | 深圳市芭田生态工程股份有限公司 | Total-nutrient water-retaining degradable mechanically-applied coated fertilizer |
| CN104926444A (en) * | 2015-06-05 | 2015-09-23 | 宁夏共享生物化工有限公司 | Method for preparing slow/controlled release fertilizer by use of modified urea resin coating material |
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Application publication date: 20140604 |