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A kind of production method of degradable controlled-release film and degradable controlled-release film slow-release fertilizer

A slow-release fertilizer and production method technology, applied in fertilizer mixtures, fertilization devices, applications, etc., can solve the problems of polluted air, difficult to degrade, and high price, and achieve the effect of simple production equipment and rapid degradation.

Inactive Publication Date: 2011-12-14
SICHUAN GUANGAN HENGLI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when using general organic high molecular polymers as coating materials for coating, there are also the following disadvantages: in most cases, organic solvents must be used to dissolve the high molecular polymers, and the coating can only be sprayed after the coating solution is formed. The solvent needs to be recovered, and the incomplete recovery of the solvent will pollute the air and is not environmentally friendly; most polymers are difficult to degrade in the soil due to their large molecular weight and complex structure. For example, polyethylene takes about 100 years in the soil It can only be degraded, and there is also the possibility of polluting the soil; the price of most polymers is relatively high, resulting in high production costs for coated controlled-release fertilizers, so most resin-coated controlled-release fertilizers are only used in flowers and high-end horticultural crops etc., it is difficult to popularize and apply to field crops

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: Heat 50kg of low-molecular-weight polyethylene wax to 120°C, stir and melt it completely, then add 20Kg and 30Kg of polyethylene and polylactic acid respectively, keep the temperature at 110-125°C, and continue to stir for 30 minutes to form a bag. membrane solution. Pressurize the reaction kettle of the coating solution to 10-15Mpa, and use a pressure nozzle to quickly atomize and spray the coating solution onto the surface of 900Kg granular fertilizer that has been preheated to 40°C. After being cooled to room temperature, a controlled release fertilizer with a nutrient controlled release period of 12 months can be obtained.

Embodiment 2

[0015] Example 2: Heat 50kg of low-molecular-weight polyethylene wax to 120°C, stir and melt it completely, then add 10Kg and 40Kg of polyethylene and polylactic acid respectively, keep the temperature at 110-125°C, and continue stirring for 30 minutes to form a bag. membrane solution. Pressurize the reaction kettle of the coating solution to 10-15Mpa, and use a pressure nozzle to quickly atomize and spray the coating solution onto the surface of 900Kg granular fertilizer that has been preheated to 40°C. After cooling to room temperature, a controlled release fertilizer with a nutrient controlled release period of 8 months can be obtained.

Embodiment 3

[0016] Example 3: Heat 60kg of low-molecular-weight polyethylene wax to 120°C, stir and melt it completely, then add 20Kg and 20Kg of polyethylene and polylactic acid respectively, keep the temperature at 110-125°C, and continue stirring for 30 minutes to form a bag. membrane solution. Pressurize the reaction kettle of the coating solution to 10-15Mpa, and use a pressure nozzle to quickly atomize and spray the coating solution onto the surface of 900Kg granular fertilizer that has been preheated to 40°C. After being cooled to room temperature, the controlled release fertilizer with a nutrient controlled release period of 10 months can be obtained.

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PUM

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Abstract

The invention discloses a degradable controlled release film and a method for producing a degradable controlled release film slow release fertilizer. The degradable controlled release film is characterized by being prepared from 50-70% by weight of low molecular polyethylene wax, 10-30% by weight of polyvinyl resin and 20-40% by weight of polylactic resin. The method for producing the degradable controlled release film slow release fertilizer comprises the following steps of: (a) heating the commercial low molecular polyethylene wax to 110-125 DEG C to form molten liquid polyethylene wax (served as a solvent) with lower viscosity; and (b) after mixing a certain amount of the polyvinyl resin and biodegradable polylactic resin, adding into the molten polyethylene wax solution, after sufficiently stirring and mixing, spraying on the surface of a large granule fertilizer which is heated to 40 DEG C, and, after cooling, forming the controlled release fertilizer with different controlled release periods and controlled release properties and good performance.

Description

technical field [0001] The invention relates to a slow-release controlled-release fertilizer and a production method thereof, in particular to a degradable controlled-release film and a production method of the degradable controlled-release film slow-release fertilizer. Background technique [0002] At present, there are mainly two types of film-coated controlled-release fertilizers at home and abroad: inorganic substance-coated fertilizers and polymer-coated fertilizers. Among them, the coated controlled-release fertilizer with organic polymer as the membrane material is becoming more and more popular, mainly because the organic polymer can be evenly distributed on the surface of fertilizer particles, and the micropores in the coating material can affect the fertilizer nutrients. Plays a better role in controlled release, will not cause burst release, and can be directly applied in full contact with seeds or crop roots at one time, saving labor and time. However, when usin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
Inventor 王成张正普赵平
Owner SICHUAN GUANGAN HENGLI CHEM