Preparation method of porous material composition loaded with farm chemical and coated with slow-release degradable film

A technology of porous materials and degradable films, which is applied in the field of pesticides, can solve the problems of difficulty in retaining plant stems and leaves, complicated process, and inability to retain stems and leaves, etc., and achieve the effect of prolonging the effective release period of drugs, simple process steps, and increasing retention time

Inactive Publication Date: 2019-12-24
CHINA NONFERROUS METAL (GUILIN) GEOLOGY & MINING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Spray the sustained-release material onto the nanomaterials adsorbed with pesticides to achieve sustained drug release, but the spraying method tends to cause small particles to agglomerate, reduce the surface area, increase the particle size, and reduce the adhesion
The main body of the slow-release material is bentonite and hollow activated carbon, both of which are non-degradable materials, which limits its slow-release effect
And nano zeolite is expensive and loses its practicability
[0005] Pesticide mixtures containing slow-release materials, such as a graphene composite controlled-release medicinal fertilizer granule and its preparation method disclosed in the invention patent number CN109053289A, although the release of the drug is slowly controlled, the cost of graphene is too high and cannot be degraded. If left in the soil, it will cause secondary pollution and lack practicality
[0006] The existing patent CN109095995A discloses a water-absorbing and water-retaining slow-release pesticide and its preparation method. Mesoporous ACF powder is used to control the slow-release of the drug, but the ACF powder is still in the research and development stage and cannot be used in actual production, and the double-layer coating increases The process is cumbersome, and the process needs to be improved
Spraying the slow-release material to wrap the drug may easily cause insufficient drug release and lose timeliness
[0007] And existing patent makes pesticide into granule, is convenient to store, but can not stay on the stem and leaf of crop after use, also does not have the effect of long-term control, discloses a kind of pesticide powder and preparation method thereof as patent CN109430259A, The slow-release material is directly wrapped on the drug granules, the granules are large, it is difficult to stay on the stems and leaves of plants, and once the film is damaged, the drug effect will be lost quickly
[0008] For example, patent CN109880763A discloses a preparation method and application of a highly active biopesticide microcapsule sustained-release agent. The use of biological strains in biopesticides has great advantages in environmental protection, but there are risks of biological contamination such as variation, and the microcapsules The production cost is high, the process is complicated, and it is difficult to further promote the use

Method used

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  • Preparation method of porous material composition loaded with farm chemical and coated with slow-release degradable film
  • Preparation method of porous material composition loaded with farm chemical and coated with slow-release degradable film

Examples

Experimental program
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Effect test

Embodiment 1

[0040] 1. Preparation of porous carbonized material:

[0041] 1) Take wheat straw as a raw material, rinse it with distilled water, dry it at 70°C for 2 hours, grind it mechanically, pass it through a 10-mesh sieve, and pulverize it for later use;

[0042] 2) Weighing 45wt% of straw powder in proportion, 35wt% of the configured mass fraction of 8% potassium hydroxide alkali solution, and 20wt% of pore-enhancing agent 15% polyvinylpyrrolidone;

[0043] 3) Soak the crushed wheat straw in the mixed solution for 5 hours, wash it with a large amount of distilled water until the pH value is 7-9, put it into a boiling dryer for ammoniation and dispersion treatment for 1 hour by heating it with ammonia gas;

[0044] 4) Put the straw powder into the tube furnace for low-temperature carbonization, and set the temperature to rise from 100°C / h to 300°C for 3 hours. During this period, the protective gas nitrogen is introduced, cooled to room temperature, and taken out for later use.

[0...

Embodiment 2

[0058] 1. Preparation of porous carbonized material:

[0059] 1) Take wheat straw as a raw material, rinse it with distilled water, dry it at 70°C for 2.5 hours, grind it mechanically, pass it through a 10-mesh sieve, and pulverize it for later use;

[0060] 2) Weighing 60wt% of straw powder in proportion, 30wt% of the configured mass fraction of 8% potassium hydroxide alkali solution, and 10wt% of pore-enhancing agent 3% urea solution;

[0061] 3) Soak the crushed wheat straw in the mixed solution for 5 hours, wash it with a large amount of distilled water until the pH value is 7-9, and put it into a boiling dryer for ammoniation and dispersion treatment with ammonia gas for 1.5 hours;

[0062] 4) Put the straw powder into the tube furnace for low-temperature carbonization, and set the temperature to rise from 100°C / h to 300°C for 3 hours. During this period, the protective gas nitrogen is introduced, cooled to room temperature, and taken out for later use.

[0063] 2. Pesti...

Embodiment 3

[0076] 1. Preparation of porous carbonized material:

[0077] 1) Weigh wheat straw as raw material, rinse it with distilled water, dry it at 73°C for 2 hours, grind it mechanically, pass it through a 10-mesh sieve, and take a portion after ultrafine grinding;

[0078] 2) Weighing 55wt% of straw powder in proportion, 30wt% of the configured mass fraction of 8% potassium hydroxide alkali solution, and 15wt% of pore-enhancing agent 3% urea solution;

[0079] 3) Soak the crushed wheat straw in the mixed solution for 5.5 hours, wash it with a large amount of distilled water until the pH value is 7-9, and put it into a boiling dryer for 1.5 hours of ammonification and dispersion treatment with ammonia gas;

[0080] 4) Put the straw powder into the tube furnace for low-temperature carbonization, and set the temperature to rise from 100°C / h to 300°C for 3 hours. During this period, the protective gas nitrogen is introduced, cooled to room temperature, and taken out for later use.

[...

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Abstract

The invention discloses a preparation method of a porous material composition loaded with a farm chemical and coated with a slow-release degradable film. The preparation method comprises the followingpreparation steps: crushing biological source straw, ammonifying the crushed straw with ammonia gas, then carbonizing the straw to obtain a porous material, soaking the porous material in a farm chemical, coating the porous material with the slow-release degradable film, drying the obtained product with a spray dryer, and screening the dried product to obtain the porous material composition. By adopting a special process, the retention time of a carrier is prolonged, the effective release period of the farm chemical is prolonged, the effect of combining immediate release and slow release is truly achieved, the farm chemical attached to the outer layer of the slow release film is released in time, and then the slow release film controls the porous carrier to slowly release the farm chemical.

Description

technical field [0001] The invention relates to the technical field of pesticides, in particular to a method for preparing a porous material composition loaded with pesticides and coated with a slow-release degradable film. Background technique [0002] As a large agricultural country, China's agricultural issues are also one of the important issues in the three rural issues, and agricultural diseases and disasters will seriously affect the national economy. Pesticides are currently the most widely used crop medicines, and are internationally recognized as the most effective medicines for preventing and controlling various pest disasters. However, the excessive use of organic pesticides in a short period of time has caused non-negligible pollution and damage to the soil environment, and has caused troubles to people's lives. Pesticides are combined with the material. [0003] In order to reduce the frequency of pesticide use, how to make pesticides work efficiently for a l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N25/08A01N25/10A01N43/54A01N37/06A01P3/00C05G3/00C05G3/02
CPCA01N25/08A01N25/10A01N37/06A01N43/54C05D9/00C05G3/00
Inventor 王立惠李硕夏村村卢宗柳张小文
Owner CHINA NONFERROUS METAL (GUILIN) GEOLOGY & MINING CO LTD
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