CN105418884A - Polyurethane combined polyether used for slowly-controlled-release fertilizer coating film, preparation method and application thereof - Google Patents
Polyurethane combined polyether used for slowly-controlled-release fertilizer coating film, preparation method and application thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/67—Unsaturated compounds having active hydrogen
- C08G18/6705—Unsaturated polymers not provided for in the groups C08G18/671, C08G18/6795, C08G18/68 or C08G18/69
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/90—Mixtures of one or more fertilisers with additives not having a specially fertilising activity for affecting the nitrification of ammonium compounds or urea in the soil
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
- C08G18/3203—Polyhydroxy compounds
- C08G18/3206—Polyhydroxy compounds aliphatic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/4009—Two or more macromolecular compounds not provided for in one single group of groups C08G18/42 - C08G18/64
- C08G18/4081—Mixtures of compounds of group C08G18/64 with other macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4804—Two or more polyethers of different physical or chemical nature
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/64—Macromolecular compounds not provided for by groups C08G18/42 - C08G18/63
- C08G18/6484—Polysaccharides and derivatives thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
- C08G18/6505—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen the low-molecular compounds being compounds of group C08G18/32 or polyamines of C08G18/38
- C08G18/6511—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen the low-molecular compounds being compounds of group C08G18/32 or polyamines of C08G18/38 compounds of group C08G18/3203
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
- C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
- C08G18/6666—Compounds of group C08G18/48 or C08G18/52
- C08G18/667—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38
- C08G18/6674—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3203
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2110/00—Foam properties
- C08G2110/0083—Foam properties prepared using water as the sole blowing agent
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2230/00—Compositions for preparing biodegradable polymers
Abstract
The invention belongs to the technical field of polyurethane and particularly relates to polyurethane combined polyether used for a slowly-controlled-release fertilizer coating film, a preparation method and an application thereof. The combined polyether is composed of a component A and a component B, wherein the component A is composed of polyether polyol A, polyether polyol B, a castor oil polymer, a degradable natural polysaccharide, a crosslinking agent, pore-forming silicon oil, a chemical foamer and a catalyst; and the component B is a mixture composed of polyaryl polymethylene isocyanate and toluene diisocynate. The combined polyether is prepared by uniformly mixing the component A and the component B according to the weight ratio of A:B = 100-120:100. The combined polyether is low in production cost, is simple in production process, is high in coating rate, is long in urea release period and is strong in degradability. The combined polyether is convenient to use due to the manner of material mixing of the component A and the component B.
Description
Technical field
The invention belongs to polyurethanes technology field, be specifically related to a kind of slow-release or control-release fertilizer coating polyurethane composition polyethers and its preparation method and application.
Background technology
Urethane foam is the thermosetting foam plastics of excellent physical properties, be widely used in the aspects such as heating pipe line, petrochemical pipe, communications and transportation, refrigerator ice cabinet, building heat preservation, aviation be military, after the degradable natural polysaccharide of introducing portion, its finished product also has certain degradability.China is an agricultural and chemical fertilizer consumption big country, but on market, the utilization ratio of common chemical fertilizer but only accounts for about 35% of total chemical fertilizer consumption amount, and the chemical fertilizer of loss has caused serious surface water and groundwater and polluted.Therefore, improve utilization rate of fertilizer, alleviate or avoid the environmental pollution because fertilizer loss causes, developing sustainable, high-efficiency agriculture is the problem that various countries pay close attention to jointly.
Film-coated controlled release fertilizer is the fertilizer with sustained release performance by certain technique, certain capsulating material being wrapped in fertiliser granulates surface and obtaining, after this kind of incorporation of fertilizerin the soil, under certain condition, its effective constituent enters soil through the overlay film being coated on particle surface, adapt with the needs of crop, can to stablize and constantly for crop provides nutrient.Therefore, film-coated controlled release fertilizer can improve utilization rate of fertilizer can reduce environmental pollution again, becomes the focus of research gradually.Coated fertilizer first, on behalf of solvent type technique, needs solvent in production process; Second on behalf of solvent-free technical matters, employing be responding layer packaging technique; The third generation is solvent-free ultra-thin packaging technique.
At present, the slow-release or control-release fertilizer coated fertilizer cost of more than 60 days deenergized period pure is abroad higher, be not suitable with China's actual conditions, and the domestic Controlled Release Fertilizer overwhelming majority occurred on the market is false Controlled Release Fertilizer, major part is sulphur coated urea and the BB fertilizer with a part of sulphur coated urea blending, and its deenergized period is about a week.The release of sulphur coated urea is the release of film rupture formula, does not substantially discharge before film rupture; After film rupture, 100% release, because its raw material sulphur crystal is not through modification, is very easy to break, so sulphur coated urea can only be called the slow-release carbamide of short period of time at most.
Urethane is as a kind of common thermosetting material, and foaming can form the fine and close skinning of one deck, and toughness is better, is inherently collected at cavity structure together simultaneously, compares and is adapted at the use of urea coated industry.But use a difficult problem for urethane to be: the add-on of urethane and the more difficult grasp of coating rate, add-on low coating rate is inadequate, add-on height stirs the uneven caking easily causing urea granules, on the other hand, this body structure of polyurethane material is comparatively stable, the natural decomposition cycle is longer, and long-time use easily causes Land pollution.
For adapting to domestic market demand, need a kind of coating rate of exploitation badly higher, the slow-release or control-release fertilizer coating polyurethane composition polyethers simultaneously can comparatively fast degraded.
Summary of the invention
For the deficiencies in the prior art, the object of this invention is to provide a kind of slow-release or control-release fertilizer coating polyurethane composition polyethers, have coating rate high, degradation speed is feature faster; The present invention provides its preparation method and application simultaneously.
Slow-release or control-release fertilizer coating polyurethane composition polyethers of the present invention, is made up of component A and B component, wherein:
Component A is with weight parts, and raw material is as follows:
B component is the mixture of poly methylene poly phenyl poly isocyanate and tolylene diisocyanate;
Wherein,
Polyether glycol A is functionality is 2.8 ~ 3.2, and molecular weight is the polyether glycol of 4500 ~ 5500;
Polyether glycol B is functionality is 2.0 ~ 2.5, and molecular weight is the polyether glycol of 1000 ~ 2000.
The YNW3050 that the preferred Shandong Inov New Material Co., Ltd. of polyether glycol A produces or the EP3600 that Shandong Lanxing Dongda Chemical Co., Ltd produces.
The YNW210 that the preferred Shandong Inov New Material Co., Ltd. of polyether glycol B produces or the DL2000 that Shandong Lanxing Dongda Chemical Co., Ltd produces.
Described castor oil polymers functionality is 2.8 ~ 2.2, and hydroxyl value is 75 ~ 105mgKOH/g, and viscosity is 210 ~ 250mPas; The HF1300 that preferred Itoh Oil Mfg produces.
Described degradable natural polysaccharide is the macromolecular mixture that starch based contains hydroxyl, the W-Gum (technical grade) that preferred Shandong Xi Wang sugar industry limited liability company produces.
Described linking agent to be functionality be 2 ~ 3 small molecule alcohol, the BDO that preferred Mitsubishi Chemical produces.
Described perforate silicone oil preferably steps figure silicone oil L580.
Described chemical foaming agent is water.
Described catalyzer is organotin metal catalyst, the T-12 (dibutyl tin laurate) that preferred US Air gasification chemical product company limited produces.
Described poly methylene poly phenyl poly isocyanate and the mass ratio of tolylene diisocyanate are 1 ~ 2:1.
The preparation method of described slow-release or control-release fertilizer coating polyurethane composition polyethers is as follows:
Preparation component A material: load weighted polyether glycol A, polyether glycol B, castor oil polymers, linking agent, perforate silicone oil, catalyzer, chemical foaming agent are added in reactor successively, 20 ~ 40min is stirred at 25 ~ 35 DEG C, degradable natural polysaccharide is added after being warming up to 40 ~ 50 DEG C, stir while adding, after adding, stir 20 ~ 40min;
B component material is the mixture of poly methylene poly phenyl poly isocyanate and tolylene diisocyanate, and the two is added reactor, stirring at normal temperature 0.5 ~ 1h.
The application of described slow-release or control-release fertilizer coating polyurethane composition polyethers is as follows:
First, A, B component material are mixed by the weight ratio of A:B=100 ~ 120:100, obtains described combined polyether; Then, urea is added reactor and be preheated to 20 DEG C, by combined polyether spray to urea surface, stir 15 ~ 20min and can complete coating.
Wherein, the consumption of combined polyether is 0.5 ~ 1% of urea quality.
Compared with prior art, beneficial effect of the present invention is as follows:
The present invention reduces surface tension of liquid by the perforate silicone oil that screening is suitable, reduces system viscosity simultaneously, effectively can reduce coating agent consumption, reduce material cost, simultaneously because polyurethane reaction operability is comparatively strong, require lower to urea coated production unit, production process is convenient and simple.By the MDI/TDI ratio in small molecular alcohol consumption in adjustment formula and system weight-average molecular weight and B component material, regulate the deenergized period of urea, by regulating the degradable natural polysaccharide ratio in formula, regulate the degradation cycle of coating urethane, final obtained combined polyether meets slow-release or control-release fertilizer service requirements, solve urea coated rate low, complex manufacturing, the slow control cycle is short, the difficult problem that the material degradation cycle is long, contribute to the development of domestic slow-release or control-release fertilizer industry, contribute to reducing fertilizer application amount simultaneously, reduce chemical fertilizer waste and it is to the pollution of water body, there is good economic benefit and social benefit.
It is low that combined polyether of the present invention has production cost, and production technique is simple, and coating rate is high, and urea is long for deenergized period, the feature that degradability is strong, and its coating rate is higher than 10%, and year, rate of weight loss was higher than 20%.
Component A material of the present invention is convenient for production, uses the form of A, B component material, uses after mixing; Urea is added reactor, stirs and be preheated to 20 DEG C, will spray in urea surface through mixed A, B component, stir 15 ~ 20min and can complete coating, application is convenient.
Embodiment
Below in conjunction with embodiment, the present invention will be further described.
The all raw materials used in embodiment, except specified otherwise, are commercial.
Embodiment 1
In 1 ton of reaction vessel, prepare component A material, weigh respectively: polyether glycol A (Shandong Inov New Material Co., Ltd. YNW3050): 20 parts; Polyether glycol B (Shandong blue star Dong great Chemical Co., Ltd. DL2000): 45 parts; Castor oil polymers (Itoh Oil Mfg HF1300): 10 parts; Degradable natural polysaccharide (Shandong Xi Wang sugar industry limited liability company W-Gum, technical grade): 15 parts; Linking agent (Mitsubishi Chemical's BDO): 10 parts; Silicone oil L580 (stepping figure): 1.5 parts; Chemical foaming agent H
2o:2 part; Catalyzer (air chemical industry T-12): 0.05 part.
By load weighted polyether glycol A, polyether glycol B, castor oil polymers, linking agent, silicone oil L580, catalyzer, chemical foaming agent H
2o, adds in reactor successively, at 25 DEG C, stir 40min, adds degradable natural polysaccharide gradually after being warming up to 40 DEG C, stir while adding, fed in raw material, after stirring 20min, taking-up is tested, meet processing parameter, send foam, obtain component A material, from reactor, take out barrelling warehouse-in.
Poly methylene poly phenyl poly isocyanate and tolylene diisocyanate are added in reactor according to the ratio of 2:1, gets final product barrelling after stirring 30min, obtain B component material.
A, B component material are mixed and made into combined polyether by A:B=120:100 weight proportion, urea are added reactor, stir be preheated to 20 DEG C, combined polyether is sprayed in urea surface, spray rear to urea stirring 15min can complete coating.
The consumption of combined polyether is 0.9% of urea quality.
Carry out performance test to the urea after the combined polyether prepared and coating, test result is respectively in table 1 and table 2.
The performance test results of the combined polyether that table 1 embodiment 1 is obtained
| Project | Index |
| Rise and send out time min | 1～2 |
| Wire drawing time min | 3～4 |
| Unsticking time min | 8～10 |
| Density kg/m 3 | 65～75 |
The performance test results of the urea after the coating that table 2 embodiment 1 is obtained
| Project | Index |
| Coating rate % >=/consumption 0.9% | 10 |
| Urea solubility rate %≤/ coating rate 10%, 24h | 8 |
| Urea solubility rate %≤/ coating rate 10%, 96h | 30 |
| Rate of weight loss % >=/year | 20 |
Embodiment 2
In 1 ton of reaction vessel, prepare component A material, weigh respectively: polyether glycol A (Shandong blue star Dong great Chemical Co., Ltd. EP3600): 30 parts; Polyether glycol B (Shandong Inov New Material Co., Ltd. YNW210): 20 parts; Castor oil polymers (Itoh Oil Mfg HF1300): 25 parts; Degradable natural polysaccharide (Shandong Xi Wang sugar industry limited liability company W-Gum, technical grade): 20 parts; Linking agent (preferred Mitsubishi Chemical BDO): 5 parts; Silicone oil L580 (stepping figure): 2.5 parts; Chemical foaming agent H
2o:4.5 part; Catalyzer (air chemical industry T-12): 0.03 part.
By load weighted polyether glycol A, polyether glycol B, castor oil polymers, linking agent, silicone oil L580, catalyzer, chemical foaming agent H
2o, adds in reactor successively, at 35 DEG C, stir 20min, adds degradable natural polysaccharide gradually after being warming up to 50 DEG C, stir while adding, fed in raw material after stirring 40min, taking-up is tested, and meets processing parameter, send foam, obtain component A material, from reactor, take out barrelling warehouse-in.
Poly methylene poly phenyl poly isocyanate and tolylene diisocyanate are added in reactor according to the ratio of 1:1, gets final product barrelling after stirring 60min, obtain B component material.
A, B component material are mixed and made into combined polyether by A:B=100:100 weight proportion, urea are added reactor, stir be preheated to 20 DEG C, combined polyether is sprayed in urea surface, spray rear to urea stirring 20min can complete coating.
The consumption of combined polyether is 0.5% of urea quality.
Carry out performance test to the urea after the combined polyether prepared and coating, test result is respectively in table 3 and table 4.
The performance test results of the combined polyether that table 3 embodiment 2 is obtained
| Project | Index |
| Rise and send out time min | 1～2 |
| Wire drawing time min | 3～4 |
| Unsticking time min | 8～10 |
| Density kg/m 3 | 45～55 |
The performance test results of the urea after the coating that table 4 embodiment 2 is obtained
| Project | Index |
| Coating rate % >=/consumption 0.5% | 10 |
| Urea solubility rate %≤/ coating rate 10%, 24h | 15 |
| Urea solubility rate %≤/ coating rate 10%, 96h | 45 |
| Rate of weight loss % >=/year | 35 |
Claims (10)
1. a slow-release or control-release fertilizer coating polyurethane composition polyethers, is characterized in that: be made up of component A and B component, wherein:
Component A is with weight parts, and raw material is as follows:
B component is the mixture of poly methylene poly phenyl poly isocyanate and tolylene diisocyanate;
Wherein,
Polyether glycol A is functionality is 2.8 ~ 3.2, and molecular weight is the polyether glycol of 4500 ~ 5500;
Polyether glycol B is functionality is 2.0 ~ 2.5, and molecular weight is the polyether glycol of 1000 ~ 2000.
2. slow-release or control-release fertilizer coating polyurethane composition polyethers according to claim 1, it is characterized in that: described castor oil polymers functionality is 2.8 ~ 2.2, hydroxyl value is 75 ~ 105mgKOH/g, and viscosity is 210 ~ 250mPas.
3. slow-release or control-release fertilizer coating polyurethane composition polyethers according to claim 1, is characterized in that: described degradable natural polysaccharide is the macromolecular mixture that starch based contains hydroxyl.
4. slow-release or control-release fertilizer coating polyurethane composition polyethers according to claim 1, is characterized in that: described linking agent to be functionality be 2 ~ 3 small molecule alcohol.
5. slow-release or control-release fertilizer coating polyurethane composition polyethers according to claim 1, is characterized in that: described chemical foaming agent is water.
6. slow-release or control-release fertilizer coating polyurethane composition polyethers according to claim 1, is characterized in that: described catalyzer is organotin metal catalyst.
7. slow-release or control-release fertilizer coating polyurethane composition polyethers according to claim 1, is characterized in that: described poly methylene poly phenyl poly isocyanate and the mass ratio of tolylene diisocyanate are 1 ~ 2:1.
8. a preparation method for the arbitrary described slow-release or control-release fertilizer coating polyurethane composition polyethers of claim 1-7, is characterized in that:
Preparation component A material: load weighted polyether glycol A, polyether glycol B, castor oil polymers, linking agent, perforate silicone oil, catalyzer, chemical foaming agent are added in reactor successively, 20 ~ 40min is stirred at 25 ~ 35 DEG C, degradable natural polysaccharide is added after being warming up to 40 ~ 50 DEG C, stir while adding, after adding, stir 20 ~ 40min.
9. an application for the arbitrary described slow-release or control-release fertilizer coating polyurethane composition polyethers of claim 1-7, is characterized in that:
First, A, B component material are mixed by the weight ratio of A:B=100 ~ 120:100, obtains described combined polyether; Then, urea is added reactor and be preheated to 20 DEG C, by combined polyether spray to urea surface, stir 15 ~ 20min and can complete coating.
10. the application of slow-release or control-release fertilizer coating polyurethane composition polyethers according to claim 9, is characterized in that: the consumption of combined polyether is 0.5 ~ 1% of urea quality.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106349450A (en) * | 2016-09-29 | 2017-01-25 | 上海东大聚氨酯有限公司 | Portfolio polyether, polyurethane adhesive, raw material composition as well as preparation methods of portfolio polyether and polyurethane adhesive and application of polyurethane adhesive |
| CN106588362A (en) * | 2016-12-20 | 2017-04-26 | 山东农业大学 | Controlled-release coated urea special for super grain rice and preparation method thereof |
| CN106832215A (en) * | 2017-02-24 | 2017-06-13 | 耿佃勇 | Polyurethane water holding controlled release fertilizer and preparation method thereof |
| CN107033582A (en) * | 2016-10-21 | 2017-08-11 | 广西师范学院 | The degradable beautiful preparation method for planting bag composite |
| CN111690112A (en) * | 2020-05-27 | 2020-09-22 | 惠州市新达发实业有限公司 | Polyurethane sponge containing plant components and production method thereof |
| CN112125740A (en) * | 2020-09-23 | 2020-12-25 | 沈阳化工研究院有限公司 | Organic-inorganic hybrid coated slow-release fertilizer and preparation method thereof |
| CN114478996A (en) * | 2022-02-14 | 2022-05-13 | 赢聚化学技术研发(南京)有限公司 | Preparation method of degradable hydrophilic polyurethane cosmetic puff |
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| CN106588362A (en) * | 2016-12-20 | 2017-04-26 | 山东农业大学 | Controlled-release coated urea special for super grain rice and preparation method thereof |
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