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Waste paper modified coated control release fertilizer and preparation method thereof

A technology of controlled release fertilizers and waste newspapers, applied in fertilizer mixtures, fertilization devices, applications, etc., can solve problems such as difficulty in large-scale promotion and application, high raw material prices, and refractory degradation, and achieve excellent nutrient controlled release performance and energy saving and energy, to overcome the effect of not easy to degrade

Active Publication Date: 2015-07-08
SHANDONG AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of these coating materials are mainly the high price of raw materials, non-renewable resources, and these components are difficult to degrade in soil
The above reasons are the main limiting factors that lead to the high price of resin-coated controlled-release fertilizers, the non-environmental protection of membrane materials, and the difficulty in large-scale application of field crops.
In order to overcome these shortcomings, researchers have carried out a lot of research work, and began to use relevant agricultural organic wastes for liquefaction as the main coating material, but these coating liquefied products or modified coating fluids contain a large amount of water-absorbing materials. The group or modification effect is poor, resulting in poor effect of controlled release of the coating, and the nutrient release period of the fertilizer is difficult to exceed 3 months, and the application effect on crops is poor

Method used

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  • Waste paper modified coated control release fertilizer and preparation method thereof

Examples

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Effect test

Embodiment 1

[0029]Crush 100kg of waste newspapers into powders smaller than 2mm, put them into a reaction kettle with a heating device, and add 200kg-300kg of liquefaction agent (the liquefaction agent is palm oil: phenol: propylene carbonate (weight ratio) = 1:1: 1 mixture). Under the condition of constant stirring, rapidly raise the temperature to 120-150°C, then add concentrated phosphoric acid and concentrated sulfuric acid successively according to 1‰ and 2‰ of the powder weight of newspaper or cardboard box, and keep stirring for about 25-30 minutes , which converts recycled waste newspaper or cardboard box powder into liquefied matter. Mix the liquefied product with the modifier (a mixture of sodium dodecylbenzenesulfonate containing a weight ratio of 1‰ in hydroxyl-terminated polydimethylsiloxane) according to a weight ratio of 100:0.1, and maintain a temperature of 60 ℃-80℃, the modification can be completed in about 20-30 minutes under the condition of constant stirring. Add 1...

Embodiment 2

[0031] Crush 100kg of waste newspapers into powders smaller than 2mm, put them into the reaction attachment with a heating device, add 200kg-300kg of liquefaction agent (palm oil, phenol and propylene carbonate are mixed in a weight ratio of 1:1.5:1 as a liquefaction agent ). Under the condition of constant stirring, rapidly raise the temperature to 120-150°C, then add concentrated phosphoric acid and concentrated sulfuric acid successively according to 1‰ and 2‰ of the powder weight of newspaper or cardboard box, and keep stirring for about 25-30 minutes , which converts recycled waste newspaper or cardboard box powder into liquefied matter. Mix the liquefied product with the modifier (hydroxyl-modified silicone oil, water-soluble polyether silicone oil, methylvinyl silicone oil, and hydroxyl-terminated polydimethylsiloxane in a weight ratio of 1:1:1:1, and then add the mixture Sodium dodecylbenzenesulfonate with a weight ratio of 1‰) is mixed according to a weight ratio of ...

Embodiment 3

[0033] Crush 100kg of recycled cardboard boxes into powders smaller than 2mm, put them into the reaction attachment with a heating device, add 200kg-300kg of liquefaction agent (palm oil, phenol and propylene carbonate are mixed into liquefaction agent according to the weight ratio of 1:1.5:1) ). Under the condition of constant stirring, rapidly raise the temperature to 120-150°C, then add concentrated phosphoric acid and concentrated sulfuric acid successively according to 1‰ and 2‰ of the powder weight of the newspaper or cardboard box, and under the condition of continuous stirring, about 25-30 In minutes, recycled waste newspaper or cardboard box powder can be converted into liquefied matter. Mix the liquefied product with the modifier (hydroxyl-modified silicone oil, water-soluble polyether silicone oil, methylvinyl silicone oil, and hydroxyl-terminated polydimethylsiloxane in a weight ratio of 1:1:1:1, and then add the mixture Sodium dodecylbenzenesulfonate (weight 1‰) ...

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Abstract

The invention relates to a waste paper modified coated control release fertilizer and a preparation method thereof. The preparation method comprises the following steps: first, adding waste paper or carton powder into a liquefier A to prepare a liquefied matter and modify; and then, uniformly mixing the modified liquefied matter and a curing agent C in a weight ratio of 1:1 as a coating material which is sprayed to the surfaces of fertilizer particles to be cured to films to obtain the coated control release fertilizer, wherein the coating material accounts for 2-8% of total weight of the fertilizer, the modified liquefied matter accounts for 0.5% of total weight of the fertilizer and the curing agent C accounts for 0.5% of total weight of the fertilizer. Compared with processing of common control release fertilizers, the fertilizer provided by the invention has the characteristics of few coating materials required, low production energy consumption, environment friendliness, production cost conservation and the like.

Description

(1) Technical field [0001] The invention relates to a modified waste paper coated coated controlled-release fertilizer and a preparation method thereof, belonging to the field of slow-controlled release fertilizer production. (2) Background technology [0002] At present, the sources of coating materials for controlled-release fertilizers at home and abroad mainly come from petrochemical and other non-renewable raw materials, such as: polyethylene, polystyrene, epoxy resin, polyols, etc. The disadvantages of these coating materials are mainly high raw material prices, non-renewable resources, and these components are difficult to degrade in soil. The above reasons are the main limiting factors that lead to the high price of resin-coated controlled-release fertilizers, the non-environmental protection of membrane materials, and the difficulty in large-scale application of field crops. In order to overcome these shortcomings, researchers have carried out a lot of research wor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/00
Inventor 杨越超张民耿毓清马丽
Owner SHANDONG AGRICULTURAL UNIVERSITY
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