Preparation method of lignin-based water-retention double-layer sustained and controlled release fertilizer

A lignin-based, controlled-release fertilizer technology, applied in the direction of layered/coated fertilizers, fertilizer mixtures, solid/semi-solid fertilizers, etc., can solve the problems of fast nutrient release, high cost of coating materials, and materials that are too hydrophilic and other problems, to achieve the effect of simple operation, improved water absorption and water retention capacity, and simple process

Active Publication Date: 2021-12-21
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there are still many problems to be solved in the biomass-based water-retaining materials, such as the high cost of the coating material, the material is too hydrophilic, the compatibility is poor, the nutrient release speed is fast, and it is not easy to degrade

Method used

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  • Preparation method of lignin-based water-retention double-layer sustained and controlled release fertilizer
  • Preparation method of lignin-based water-retention double-layer sustained and controlled release fertilizer
  • Preparation method of lignin-based water-retention double-layer sustained and controlled release fertilizer

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preparation example Construction

[0022] The invention is a preparation method of a lignin-based water-retaining slow-controlled release fertilizer, the steps of which are as follows:

[0023] Step (1) Preparation of the blended solution of polyvinyl alcohol and cellulose derivatives: Connect a condenser tube and a mechanical stirrer in the reaction vessel, add 1-6g of polyvinyl alcohol and 100-200 mL of distilled water, and raise the temperature of the water bath to 90-95 ℃, stir and keep warm for 1 hour until it is completely dissolved, and a 1-6% concentration of polyvinyl alcohol solution is obtained. Cool the system down to 50-60°C, stir quickly and add 0.5-2g of cellulose derivatives, and stir at this temperature for 30 minutes to obtain a blend solution of polyvinyl alcohol and cellulose derivatives with a concentration of 1-6%;

[0024] The pure polyvinyl alcohol solution prepared in step (2) is compared with the solution obtained in step (1);

[0025] Step (3) Preparation of lignin-based solution: fi...

Embodiment 1

[0042] Embodiment 1: preparation method, comprises the following steps:

[0043] ①Inner coating: by mass parts, mechanically stir 1g of polyvinyl alcohol and 100ml of aqueous solution at 85°C at a speed of 200r / min and keep warm for 1h. Lower the temperature to 45°C, increase the rotation speed to 300r / min, add 0.5g of ethyl cellulose and stir rapidly for 30min to obtain a blended solution for later use;

[0044] ②Outer coating: Dissolve 0.25g of sodium lignosulfonate in 100ml of sodium hydroxide solution (1 mol / L) to obtain a lignin-based solution. 4.0 g of acrylic acid, 4.0 g of acrylamide and 0.31 g of N,N' methylenebisacrylamide were dissolved in 30 mL of distilled water to obtain a mixed solution. The above solution was ultrasonically oscillated at a frequency of 50 MHz for 40 min, 0.8 g of attapulgite (ATP) was added to the lignin-based solution, and then the mixed solution was added to the lignin-based solution. After the system was uniformly dispersed, HCl was added ...

Embodiment 2

[0047] Embodiment 2: preparation method, comprises the following steps:

[0048] ①Inner coating: by mass parts, mechanically stir 3.5g of polyhydroxybutyrate and 50ml of chloroform at 95°C at a speed of 500r / min and keep warm for 3h. Lower the temperature to 55°C, reduce the rotational speed to 330r / min, add 0.75g of cellulose acetate butyrate and stir rapidly for 40min to obtain a blended solution for later use;

[0049] ② Outer coating: Dissolve 0.75g of calcium lignosulfonate in 150ml of sodium hydroxide solution (1 mol / L) to obtain a lignin-based solution. 5.0 g of acrylic acid, 5.0 g of acrylamide and 0.45 g of N,N' methylenebisacrylamide were dissolved in 25 mL of distilled water to obtain a mixed solution. The above solution was ultrasonically oscillated at a frequency of 60 MHz for 30 minutes, 1.0 g of attapulgite (ATP) was added to the lignin-based solution, and then the mixed solution was added to the lignin-based solution. After the system was uniformly dispersed,...

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Abstract

The invention provides a preparation method of a lignin-based water-retention double-layer sustained and controlled release fertilizer. The preparation method comprises the following steps: (1) blending polyvinyl alcohol and a cellulose derivative to obtain a mixed liquid for later use; (2) carrying out graft polymerization on an acrylic acid-acrylamide copolymer and a lignin derivative to obtain a lignin-based water absorbent; (3) uniformly spraying the blended solution in the step (1) on the surfaces of fertilizer particles, and repeatedly coating multiple times to obtain a single-layer coated fertilizer; and (4) uniformly coating the lignin-based water absorbent powder which is ground in advance on the outer layer of the single-layer coated fertilizer, and finally drying the fertilizer at 55 DEG C to obtain the double-layer coated slow-release fertilizer. According to the invention, the coating materials used in the invention are all degradable materials, and a double-layer coating form is adopted, so that the defects of single performance and difficulty in control of a single-layer coating can be overcome; and the method is simple in process, low in cost, short in technological process period and free of waste.

Description

technical field [0001] The invention relates to a preparation technology of a lignin-based water-retaining double-layer slow-controlled release fertilizer. Background technique [0002] Due to the low utilization rate of fertilizers, the single function of fertilizers, and the rapid release of nutrients, slow-release fertilizers are playing an increasingly important role in improving the quality and efficiency of modern agriculture. They are currently the most widely used and most effective multi-functional fertilizers. Excellent fertilizer. In particular, degradable, green, low-cost and recyclable fertilizer coating materials have added a lot of color to the development of green agriculture. In recent years, the country has paid great attention to the development and modification of slow and controlled release fertilizers, which has greatly improved the research and development of my country in corn, soybeans, flowers, and rice. Fertilizer technology still has big problems...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G3/40C05G5/12C05G5/30
CPCC05G3/00C05G3/40C05G5/12C05G5/30C05D9/00Y02P60/21
Inventor 李慧王宁张笠廖勋桦魏园园王臻煜马应霞张龙
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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