CN105693354A - Preparation technology of water-retention slow-release fertilizer - Google Patents
Preparation technology of water-retention slow-release fertilizer Download PDFInfo
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- CN105693354A CN105693354A CN201410700026.7A CN201410700026A CN105693354A CN 105693354 A CN105693354 A CN 105693354A CN 201410700026 A CN201410700026 A CN 201410700026A CN 105693354 A CN105693354 A CN 105693354A
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Abstract
The invention discloses a preparation technology of water-retention slow-release fertilizer. The preparation technology comprises material blending, inner coating layer bonding, seal layer bonding and water-retaining agent bonding. The preparation technology utilizes urea as a core, humic acid-rich weathered coal, phosphate rock or bentonite as an inner coating film and high-hydroscopicity resin as an outer coating film to prepare fertilizer with water-retaining properties and slow release effects. The outer coating film water-retaining agent and urea of the water-retention slow-release fertilizer are bonded through hydrogen bonds so that the water-retaining agent can adsorb a certain amount of urea molecules. When urea content in the environment is low, the water-retention slow-release fertilizer can slowly release urea in the environment so that the water-retaining agent has functions of water absorption and water retention and has a certain nutrient slow-release function.
Description
Technical field
The present invention relates to fertilizer field, be specifically related to the preparation technology of a kind of Water-retaining slow-release fertilizer。
Background technology
China is a large agricultural country, and chemical fertilizer and water resource are the important substance bases of developing modern agriculture, and China's chemical fertilizer this season plant recovery of nutrient is low, lags far behind other developed countries。Low utilization rate of fertilizer not only causes the environmental pollution such as body eutrophication, depletion of the ozone layer, and wastes substantial amounts of manpower, financial resources and resource etc.。Research shows, uses slow-release carbamide and can be effectively improved nitrogen utilization efficiency, meets the policy developing sustainable high-efficiency agriculture。Up to the present, multiple slow-release material has been probed into, and had some release-controlled coated fertilizer to have been carried out industrialized production。Drought and water shortage is the matter of utmost importance that the whole world is arid, semiarid zone agricultural development is encountered。Research finds, a small amount of super absorbent resin is used for agricultural production, not only effectively facilitate germination and emerge, improves seedling percent etc. in have huge potentiality, but also Soil structure can be improved, minimizing irrigation frequency and leaching loss etc.。
There is interaction between liquid manure, with fertile water transfer, with the short fertilizer of water, give full play to the cooperative effect of liquid manure, combined with slow-release fertilizer by water-retaining agent, preparing the fertilizer of retaining water and releasing nutrients slowly with dual-use function becomes the focus of water-fertilizer conditioning。At present, the preparation of the fertilizer of retaining water and releasing nutrients slowly mostly adopts and is placed in reactor by slow-release fertilizer, makes polymerization single polymerization monomer stock solution directly cause polymerization peplos at fertilizer surface, owing to peplos polymer fluid has bigger viscosity, causes and easily sticks together between fertiliser granulates。
Summary of the invention
It is an object of the invention to overcome the defect existed in prior art, it is provided that a kind of adhesion, liquid manure high efficiency the preparation technology of Water-retaining slow-release fertilizer。
For realizing above-mentioned technique effect, the technical scheme is that the preparation technology of a kind of Water-retaining slow-release fertilizer, it is characterised in that comprise the following steps:
S1: the urea granules that particle diameter is 2～3mm is added in granulating disc；
S2: to urea granules surface sprinkling organic binder bond; until when urea surface forms one layer of binding liquid and slight adhesion occurs; slow-release material is added in comminutor; turn to slow-release material powder and be all wrapped in urea granules surface; organic binder bond is again sprayed to urea granules surface; repeat above operation for several times, form inner investment layer；
S3: spray into heated melted paraffin with high-pressure spray gun in granulating disc, make coated carbamide；
S4: spray organic binder bond again, is sprinkled into water-retaining agent powder in comminutor, until water-retaining agent powder is all wrapped in fertilizer surface, at 45 DEG C after dry 3～4h, obtains Water-retaining slow-release fertilizer。
Wherein, described slow-release material is at least one in weathered coal, bentonite, zeolite, charcoal, and the consumption of described slow-release material is the 30～35% of urea granules weight。
Wherein, described water-retaining agent is polyacrylic acid water-absorbing resins, and the consumption of described water-retaining agent is the 20～25% of urea granules weight。
Wherein, described organic binder bond is polyvinyl alcohol water solution。
Advantages of the present invention and having the beneficial effects that:
With carbamide for core, with rich in the weathered coal of humic acids, phosphorus ore or bentonite for inner investment, with super absorbent resin for peplos, make existing water-retaining property and there is again the fertilizer of slow-releasing, due to the hydrogen bond association between peplos water-retaining agent and the carbamide of the fertilizer of retaining water and releasing nutrients slowly, make the adsorbable a certain amount of urea molecule of water-retaining agent, when the urea content of external environment is low, can carbamide be released slowly in environment, so that water-retaining agent is except having the function of water suction, water conservation, give again its certain nutrient slowly-released function。
Detailed description of the invention
Below in conjunction with embodiment, the specific embodiment of the present invention is further described。Following example are only for clearly illustrating technical scheme, and can not limit the scope of the invention with this。
Embodiment 1
The preparation technology of the Water-retaining slow-release fertilizer of embodiment 1, comprises the following steps:
S1: the urea granules that particle diameter is 2～3mm is added in granulating disc；
S2: to urea granules surface sprinkling organic binder bond; until when urea surface forms one layer of binding liquid and slight adhesion occurs; slow-release material is added in comminutor; turn to slow-release material powder and be all wrapped in urea granules surface; organic binder bond is again sprayed to urea granules surface; repeat above operation for several times, form inner investment layer；
S3: spray into heated melted paraffin with high-pressure spray gun in granulating disc, make coated carbamide；
S4: spray organic binder bond again, is sprinkled into water-retaining agent powder in comminutor, until water-retaining agent powder is all wrapped in fertilizer surface, at 45 DEG C after dry 3h, obtains Water-retaining slow-release fertilizer。
Wherein, slow-release material is weathered coal, and the consumption of slow-release material is the 30% of urea granules weight。
Wherein, water-retaining agent is polyacrylic acid water-absorbing resins, and the consumption of water-retaining agent is the 20% of urea granules weight。
Wherein, organic binder bond is polyvinyl alcohol water solution。
Embodiment 2
The preparation technology of the Water-retaining slow-release fertilizer of embodiment 2, comprises the following steps:
S1: the urea granules that particle diameter is 2～3mm is added in granulating disc；
S2: to urea granules surface sprinkling organic binder bond; until when urea surface forms one layer of binding liquid and slight adhesion occurs; slow-release material is added in comminutor; turn to slow-release material powder and be all wrapped in urea granules surface; organic binder bond is again sprayed to urea granules surface; repeat above operation for several times, form inner investment layer；
S3: spray into heated melted paraffin with high-pressure spray gun in granulating disc, make coated carbamide；
S4: spray organic binder bond again, is sprinkled into water-retaining agent powder in comminutor, until water-retaining agent powder is all wrapped in fertilizer surface, at 45 DEG C after dry 4h, obtains Water-retaining slow-release fertilizer。
Wherein, slow-release material is bentonite, and the consumption of slow-release material is the 35% of urea granules weight。
Wherein, water-retaining agent is polyacrylic acid water-absorbing resins, and the consumption of water-retaining agent is the 25% of urea granules weight。
Wherein, organic binder bond is polyvinyl alcohol water solution。
Embodiment 3
The preparation technology of the Water-retaining slow-release fertilizer of embodiment 3, comprises the following steps:
S1: the urea granules that particle diameter is 2～3mm is added in granulating disc；
S2: to urea granules surface sprinkling organic binder bond; until when urea surface forms one layer of binding liquid and slight adhesion occurs; slow-release material is added in comminutor; turn to slow-release material powder and be all wrapped in urea granules surface; organic binder bond is again sprayed to urea granules surface; repeat above operation for several times, form inner investment layer；
S3: spray into heated melted paraffin with high-pressure spray gun in granulating disc, make coated carbamide；
S4: spray organic binder bond again, is sprinkled into water-retaining agent powder in comminutor, until water-retaining agent powder is all wrapped in fertilizer surface, at 45 DEG C after dry 3.5h, obtains Water-retaining slow-release fertilizer。
Wherein, slow-release material charcoal, the consumption of slow-release material is the 32.5% of urea granules weight。
Wherein, water-retaining agent is polyacrylic acid water-absorbing resins, and the consumption of water-retaining agent is the 22.5% of urea granules weight。
Wherein, organic binder bond is polyvinyl alcohol water solution。
When using weathered coal as slow-release material, owing to weathered coal density is relatively low, it is easier to be water dispersible, so slow release effect is worst;When using bentonite as slow-release material, there is good caking property and plasiticity index due to bentonite, add granule strength, can forming film one layer fine and close at fertilizer surface, therefore fertilizer has good slow-releasing in the early stage, but owing to bentonite belongs to swell-shrink characteristic mineral, long-term immersion in water, making it expand, microporosity increases, so that slow-releasing reduces。Owing to phosphorus ore belongs to the non-swell-shrink characteristic mineral of resistance to water, can fitly arranging in urea surface, form peplos one layer fine and close, make diffusional resistance increase, therefore slow release effect is best。
The fertilizer of retaining water and releasing nutrients slowly has good water holding capacity after being manured into soil, it is possible to slow down the evaporation of soil moisture。During the rainy day, unnecessary Moisture Content in Storage is got up by the fertilizer of retaining water and releasing nutrients slowly, when arid, it is adsorbed on the moisture in the fertilizer of retaining water and releasing nutrients slowly and can by plant root capillary attraction, then be transported in plant, play the effect of " miniature reservoir ", thus reducing irrigation frequency, improve efficiency of water application。
The above is only the preferred embodiment of the present invention; it should be pointed out that, for those skilled in the art, under the premise without departing from the technology of the present invention principle; can also making some improvements and modifications, these improvements and modifications also should be regarded as protection scope of the present invention。
Claims (4)
1. the preparation technology of a Water-retaining slow-release fertilizer, it is characterised in that comprise the following steps:
S1: the urea granules that particle diameter is 2～3mm is added in granulating disc；
S2: to urea granules surface sprinkling organic binder bond; until when urea surface forms one layer of binding liquid and slight adhesion occurs; slow-release material is added in comminutor; turn to slow-release material powder and be all wrapped in urea granules surface; organic binder bond is again sprayed to urea granules surface; repeat above operation for several times, form inner investment layer；
S3: spray into heated melted paraffin with high-pressure spray gun in granulating disc, make coated carbamide；
S4: spray organic binder bond again, is sprinkled into water-retaining agent powder in comminutor, until water-retaining agent powder is all wrapped in fertilizer surface, at 45 DEG C after dry 3～4h, obtains Water-retaining slow-release fertilizer。
2. the preparation technology of Water-retaining slow-release fertilizer according to claim 1, it is characterised in that described slow-release material is at least one in weathered coal, bentonite, zeolite, charcoal, and the consumption of described slow-release material is the 30～35% of urea granules weight。
3. the preparation technology of Water-retaining slow-release fertilizer according to claim 2, it is characterised in that described water-retaining agent is polyacrylic acid water-absorbing resins, the consumption of described water-retaining agent is the 20～25% of urea granules weight。
4. the preparation technology of Water-retaining slow-release fertilizer according to claim 3, it is characterised in that described organic binder bond is polyvinyl alcohol water solution。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410700026.7A CN105693354A (en) | 2014-11-28 | 2014-11-28 | Preparation technology of water-retention slow-release fertilizer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410700026.7A CN105693354A (en) | 2014-11-28 | 2014-11-28 | Preparation technology of water-retention slow-release fertilizer |
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| CN105693354A true CN105693354A (en) | 2016-06-22 |
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| CN201410700026.7A Pending CN105693354A (en) | 2014-11-28 | 2014-11-28 | Preparation technology of water-retention slow-release fertilizer |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107698345A (en) * | 2017-11-13 | 2018-02-16 | 泰州职业技术学院 | High hydroscopic resin coated slow release fertilizer containing polyglutamic acid and preparation method thereof |
| CN108424212A (en) * | 2017-09-11 | 2018-08-21 | 中国科学院地理科学与资源研究所 | Film-coated controlled release fertilizer and preparation method thereof containing polyvinyl alcohol |
| CN108623391A (en) * | 2018-06-29 | 2018-10-09 | 湖南泰谷生态工程有限公司 | A kind of soybean oil modified alkyd film-coated controlled release fertilizer |
| CN109851431A (en) * | 2019-03-15 | 2019-06-07 | 姜玉贞 | A kind of slow-release compound fertilizer of modified synergistic and preparation method thereof |
| CN111533243A (en) * | 2020-04-30 | 2020-08-14 | 南京大学 | Granular humic biological filler, production method and application |
-
2014
- 2014-11-28 CN CN201410700026.7A patent/CN105693354A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108424212A (en) * | 2017-09-11 | 2018-08-21 | 中国科学院地理科学与资源研究所 | Film-coated controlled release fertilizer and preparation method thereof containing polyvinyl alcohol |
| CN107698345A (en) * | 2017-11-13 | 2018-02-16 | 泰州职业技术学院 | High hydroscopic resin coated slow release fertilizer containing polyglutamic acid and preparation method thereof |
| CN108623391A (en) * | 2018-06-29 | 2018-10-09 | 湖南泰谷生态工程有限公司 | A kind of soybean oil modified alkyd film-coated controlled release fertilizer |
| CN109851431A (en) * | 2019-03-15 | 2019-06-07 | 姜玉贞 | A kind of slow-release compound fertilizer of modified synergistic and preparation method thereof |
| CN111533243A (en) * | 2020-04-30 | 2020-08-14 | 南京大学 | Granular humic biological filler, production method and application |
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Application publication date: 20160622 |