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Modified paper making black liquid biological base film covering controlled-release fertilizer and preparation method thereof

A paper-making black liquor and controlled-release fertilizer technology, which is applied to layered/coated fertilizers, fertilizer mixtures, fertilization devices, etc., can solve the problems of high cost and poor treatment effect, achieve low equipment requirements, reduce surface energy, and improve The effect of nutrient release period

Inactive Publication Date: 2017-08-22
SHANDONG AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although many methods of treating papermaking wastewater using grass as raw materials have been successful, there are still many problems. For example, some methods either have poor treatment effects or are too expensive.

Method used

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  • Modified paper making black liquid biological base film covering controlled-release fertilizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Concentrate the papermaking black liquor, add dilute sulfuric acid to neutralize it, and dry it into powder. Weigh 200g of powder, add it to a reaction kettle with heating, stirring and condensing device, add 800g of liquefaction agent (polyethylene glycol and ethylene glycol are mixed uniformly in a weight ratio of 1:1 as a liquefaction agent), and stir , turn on the reactor and rapidly raise the temperature to 90°C, add concentrated sulfuric acid as a catalyst according to 3% of the weight ratio of the liquefaction agent, and continue to stir and react for 60 minutes to prepare a papermaking black liquor liquefaction product. Add 0.1% modifier (fluoroalkane, fluorosilane, perfluoro(alk)ene ether, fluoroalcohol, fluorine-containing acrylate and nano-silica, One or several of them such as nano-calcium carbonate), mixed uniformly and vibrated in ultrasonic for 30 minutes to obtain a modified liquefied product. Mix the modified liquefied product and the curing agent isoc...

Embodiment 2

[0028] Concentrate the papermaking black liquor, add dilute sulfuric acid to neutralize it, and dry it into powder. Weigh 200g of powder, add it to a reaction kettle with heating, stirring and condensing device, add 700g of liquefaction agent (polyethylene glycol, ethylene glycol, ethylene carbonate in a weight ratio of 1:1:1 and mix it uniformly as a liquefied liquefaction agent), under stirring conditions, open the reactor and rapidly heat up to 80°C, add concentrated sulfuric acid as a catalyst according to 4% of the weight ratio of the liquefaction agent, and continue stirring and reacting for 40 minutes to obtain a papermaking black liquor liquefaction product. Add 0.5% modifier (fluoroalkane, fluorosilane, perfluoro(alk)ene ether, fluoroalcohol, fluorine-containing acrylate and nano silicon dioxide, nano calcium carbonate to the liquefied product) One or several of them), mixed evenly, and vibrated in ultrasonic for 20 minutes to obtain a modified liquefied product. Mix...

Embodiment 3

[0030]Concentrate the papermaking black liquor, add dilute hydrochloric acid to neutralize it, and dry it into powder. Weigh 200g of powder, add it to a reaction kettle with heating, stirring and condensing device, add 800g of liquefaction agent (polyethylene glycol and glycerin are mixed uniformly in a weight ratio of 9:1 as a liquefaction agent), and under stirring conditions, open The temperature of the reaction kettle was rapidly raised to 120° C., and concentrated sulfuric acid was added as a catalyst according to the weight ratio of 3.5% of the liquefaction agent, and the stirring reaction was continued for 90 minutes to obtain a papermaking black liquor liquefaction product. Add 1% modifier (fluoroalkane, fluorosilane, perfluoro(alk)ene ether, fluoroalcohol, fluorine-containing acrylate and nano silicon dioxide, nano calcium carbonate to the liquefied product) One or several of them), mixed uniformly and vibrated in ultrasonic for 60 minutes to obtain a modified liquefi...

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PUM

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Abstract

The invention relates to a modified paper making black liquid biological base film covering controlled-release fertilizer and a preparation method thereof. According to the method, firstly, paper making black liquid is added into diluted sulphuric acid or diluted hydrochloric acid to be neutralized into the neutral state; after the concentration and drying, the materials are made into powder; liquefying agents are added for liquification; next, a paper making black liquid liquefied product is obtained; next, modifying agents are added for modifying the liquefied product; next, the modified liquefied product and a curing agent are uniformly mixed according to the weight ratio of 1:(0.1 to 10) to be used as a film covering material; the film covering material is sprayed and coated onto the surface of a particle fertilizer under the condition of a certain pressure; the biological base polyurethane film coating controlled-release fertilizer is prepared after the curing for 1 to 10 minutes under the condition of 10 to 100 DEG C. According to the required nutrient controlled-release period of the crops, the weight of the film covering material is regulated to account for 1 to 10 percent of the total weight ratio of the particle fertilizer. The modified paper making black liquid biological base film covering controlled-release fertilizer has the advantages that the film material resources are wide; the price is low; the energy consumption is low; the film covering process is simple; the film material can be easily degraded; the cost is low; the environment-friendly effect is achieved.

Description

[0001] (1) Technical field [0002] The invention relates to a modified papermaking black liquor bio-based coated controlled-release fertilizer and a preparation method thereof, belonging to the field of new fertilizer production. [0003] (2) Background technology [0004] Chemical fertilizers play a very important role in agricultural production and are the largest material investment in agricultural production. With the increase of the world population, the human demand for food production is also increasing, and the amount of chemical fertilizers is also increasing. my country is a country with a large population in the world, and it is also a big consumer of chemical fertilizers. At present, the utilization rate of chemical fertilizers in our country is relatively low. The seasonal utilization rate of nitrogen fertilizer is 30%-35%, that of phosphorus fertilizer is 10%-20%, and that of potassium fertilizer is 35%-50%, which is 15-20 percentage points lower than that of de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C08G18/48C08G18/32C08G18/66C08G18/64C08K3/36C08K3/26
CPCC05G5/30C08G18/3206C08G18/4825C08G18/6484C08G18/6492C08G18/6674C08G18/6677C08K3/26C08K3/36C08K2003/265C08K2201/011
Inventor 杨越超马晓晓
Owner SHANDONG AGRICULTURAL UNIVERSITY
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