A kind of in-situ reaction film-forming controlled-release fertilizer and its production method

An in-situ reaction and controlled-release fertilizer technology, which is applied to fertilizer mixtures, layered/coated fertilizers, applications, etc., can solve the problems of unstable coating, loss of strength, and reduced controlled-release performance of fertilizers.

Active Publication Date: 2020-01-14
BEIJING ACADEMY OF AGRICULTURE & FORESTRY SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main problem of the film layer prepared by these methods is that the film is unstable in the soil, and it is easy to lose strength prematurely during the degradation process, which reduces the controlled release performance of the fertilizer.

Method used

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  • A kind of in-situ reaction film-forming controlled-release fertilizer and its production method

Examples

Experimental program
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Effect test

Embodiment 1

[0062] With 100g cornstarch, the liquefaction agent that is made up of 210g Polyethylene Glycol 400 and 90g glycerin, the concentrated sulfuric acid acidic catalyst of 8g98%, after mixing in the reactor that mechanical stirring and condensation tube are housed, be heated up to under constant stirring 160°C, constant temperature reaction for 120 minutes, and then rapid cooling to terminate the reaction to obtain starch polyol.

[0063] Firstly, urea granules (2-4 mm) are input into a heating drum with a lifting plate at a speed of 50 kg per minute, and the temperature of the drum is 100°C.

[0064] Then by 374g phthalic anhydride polyester polyol (purchased in Beijing Sikerui, trade mark is SKR-T5, relative molecular mass is 500); Coating solution II composed of paraffin wax at 60°C and 330 g of curing agent polymethylene polyphenyl polyisocyanate (the brand name is Bayer 44V20) are sprayed onto the surface of the rotating urea granule through the nozzle at the same time, and t...

Embodiment 2

[0068] Firstly, urea granules (2-4 mm) are input into a heating drum with a lifting plate at a speed of 50 kg per minute, and the temperature of the drum is 100°C.

[0069] Then the coating liquid I, 500g solidifying agent polymethylene polyphenyl polyphenylene polyol, 500g solidifying agent polymethylene polyphenyl polyphenylene polyol, 6g catalyst dibutyltin dilaurate, 24g auxiliary agent fusing point are formed by 60 ℃ of paraffins by 520g starch polyol prepared by the method provided in embodiment 1. Isocyanate (the trade mark is Bayer 44V20) is sprayed onto the surface of the rotating granular fertilizer by a nozzle simultaneously, and the coating layer formed accounts for 2% of the urea granule weight;

[0070] After about 3 minutes, 374g of phthalic anhydride polyester polyol (purchased from Beijing Sikerui, the brand name is SKR-T5, the relative molecular mass is 500); 4.4g catalyst dibutyltin dilaurate, 4.4g catalyst triethanolamine, 33.8g additive Coating solution II...

Embodiment 3

[0073] With 100g corn stalk powder, the liquefaction agent that is made up of 250g macrogol 400 and 50g glycerin, the concentrated sulfuric acid catalyst of 9g98%, after mixing uniformly in the reactor that mechanical stirring and condenser tube are housed, be heated up to under constant stirring 160° C., constant temperature reaction for 120 minutes, and then rapid cooling to terminate the reaction to obtain straw polyol.

[0074] Firstly, the Sacofu compound fertilizer (2-4mm, N-P-K: 15-15-15) is input into the heating drum with a lifting board at a speed of 50kg per minute, and the temperature of the drum is 70°C.

[0075] Then by 288g polyether polyol TAE470 (purchased from Tianjin Petrochemical, relative molecular mass is 470), 8.5g catalyst stannous octoate, 75.6g soybean oil polyol (purchased from U.S. USSC company, trade mark is Soyoyl R137, relative molecular mass is 530), coating solution II, 396g solidifying agent polymethylene polyphenyl polyisocyanate that 17.1g a...

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Abstract

The invention discloses an in-situ reaction film-forming type release-controlled fertilizer and a production method thereof. The method for preparing the in-situ reaction film-forming type release-controlled fertilizer comprises the following steps: respectively spraying an enveloping solution I and an enveloping solution II onto fertilizer grain surfaces and then forming the films, thereby acquiring the in-situ reaction film-forming type release-controlled fertilizer, wherein a biomass liquefied matter is contained in the enveloping solution I; low-polymer polyhydric alcohol is contained in the enveloping solution II; the spraying sequence is that the enveloping solution I is firstly sprayed and then the enveloping solution II is sprayed or the enveloping solution II is firstly sprayed and then the enveloping solution I is sprayed. The method not only can solve the problem of reducing of release-controlled performance of the fertilizer caused by easiness in early losing strength in a degradation process but also has the advantage of fine precise design for fertilizer performance.

Description

technical field [0001] The invention belongs to the field of controlled-release fertilizers, and relates to an in-situ reaction film-forming controlled-release fertilizer and a production method thereof. Background technique [0002] Coated release fertilizer refers to a new type of fertilizer that can adjust the release rate and supply intensity of nutrients according to the nutrient demand characteristics of plants in different growth stages, so that the nutrient release mode can be synchronized with crop fertilizer absorption. Environmentally friendly and other advantages. [0003] At present, according to different preparation processes, coated controlled-release fertilizers are mainly divided into three types: organic solvent type, water type and in-situ reaction film-forming type. The specific preparation process of the in-situ reaction film-forming type is to directly spray the monomer onto the surface of the fertilizer to react and form a film, which has the charact...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C05G3/00C05G3/90
CPCC05C9/00C05G3/90C05G5/30
Inventor 李丽霞曹兵杨宜斌李鸿雁邹国元肖强倪小会许新朋赵同科
Owner BEIJING ACADEMY OF AGRICULTURE & FORESTRY SCIENCES
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